/* ═══════════════════════════════════════════════════════════
   AB Lab v1.0 — 实验室风格设计系统
   视觉方向: 深色主题 × 紫色渐变 × 现代卡片式设计
   ═══════════════════════════════════════════════════════════ */

:root {
    /* ── 核心色板 - 深色背景 ── */
    --bg-deep: #1a1a2e;
    --bg-surface: #16162a;
    --bg-card: #252542;
    --bg-elevated: #2d2d4a;
    --border: #3d3d5c;
    --border-bright: #4d4d6a;

    /* ── 主色调：紫色渐变系 ── */
    --purple-primary: #8b5cf6;
    --purple-dim: #8b5cf620;
    --purple-bright: #a78bfa;
    --purple-dark: #6d28d9;
    
    /* ── 辅助色 ── */
    --cyan: #8b5cf6;
    --cyan-dim: #8b5cf620;
    --magenta: #ec4899;
    --magenta-dim: #ec489920;
    --yellow: #f59e0b;
    --yellow-dim: #f59e0b20;
    --blue: #3b82f6;
    --blue-dim: #3b82f620;
    --green: #10b981;
    --green-dim: #10b98120;

    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;

    /* ── 渐变 ── */
    --gradient-brand: linear-gradient(135deg, #8b5cf6 0%, #ec4899 100%);
    --gradient-1: linear-gradient(135deg, #8b5cf6, #6d28d9);
    --gradient-2: linear-gradient(135deg, #6366f1, #8b5cf6);
    --gradient-3: linear-gradient(135deg, #ec4899, #f472b6);
    --gradient-4: linear-gradient(135deg, #f59e0b, #fbbf24);
    --gradient-card: linear-gradient(145deg, #252542 0%, #1e1e38 100%);

    /* ── 字体 ── */
    --font-display: 'Space Mono', 'JetBrains Mono', monospace;
    --font-body: 'Noto Sans SC', system-ui, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

    /* ── 间距 ── */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { font-size: 14px; scroll-behavior: smooth; }

body {
    font-family: var(--font-body);
    background: var(--bg-deep);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
}

/* ═══ SVG 内联图标通用样式 ═══ */
svg {
    flex-shrink: 0;
}

/* 按钮/标签中的 SVG 图标对齐 */
.btn-icon svg,
.q-icon svg,
.tool-learn-icon svg,
.metric-chat-icon svg,
.track-tab-icon svg,
.console-nav-icon svg,
.card-icon svg,
.topic-icon svg,
.flask-icon svg {
    display: inline-block;
    vertical-align: middle;
}

/* 导航/卡片图标容器 */
.console-nav-icon svg,
.card-icon svg {
    width: 18px;
    height: 18px;
}

.topic-icon svg {
    width: 16px;
    height: 16px;
}

/* 小型内联图标 */
.q-icon svg {
    width: 13px;
    height: 13px;
}

.btn-icon svg {
    width: 14px;
    height: 14px;
    vertical-align: -2px;
}

/* 确保 SVG 图标继承颜色 */
h1 svg, h2 svg, h3 svg, h4 svg,
strong svg, span svg, a svg, p svg,
button svg, label svg, .tag svg {
    vertical-align: -2px;
}

/* 网格背景纹理 - 微弱紫色光晕 */
body::before {
    content: '';
    position: fixed;
    top: 0; right: 0; bottom: 0; left: 0;
    background: 
        radial-gradient(ellipse at 20% 20%, rgba(139, 92, 246, 0.08) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 80%, rgba(236, 72, 153, 0.06) 0%, transparent 50%);
    pointer-events: none;
    z-index: 0;
}

/* ═══ 顶部导航 ═══ */
.top-bar {
    position: sticky;
    top: 0;
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 24px;
    height: 60px;
    background: linear-gradient(90deg, #1a1a2e 0%, #252542 100%);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border);
    box-shadow: 0 2px 20px rgba(0,0,0,0.3);
}

.logo-area {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo-icon svg { width: 32px; height: 32px; }

.logo-text {
    font-family: var(--font-display);
    font-size: 1.4rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--text-primary);
}

.logo-text .accent {
    background: var(--gradient-brand);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.logo-text .logo-sub {
    font-size: 0.65em;
    font-weight: 400;
    opacity: 0.7;
    margin-left: 2px;
    letter-spacing: 0.05em;
}

.version-tag {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    padding: 3px 8px;
    border-radius: 12px;
    background: var(--gradient-brand);
    color: #fff;
    border: none;
    line-height: 1;
    margin-top: 2px;
    font-weight: 500;
}

.mode-switch {
    display: flex;
    gap: 8px;
    background: transparent;
    border-radius: var(--radius-md);
    padding: 0;
    border: none;
}

.mode-btn {
    font-family: var(--font-body);
    font-size: 0.85rem;
    font-weight: 500;
    padding: 10px 20px;
    border: none;
    border-radius: 20px;
    cursor: pointer;
    background: transparent;
    color: var(--text-secondary);
    transition: all 0.25s ease;
    display: flex;
    align-items: center;
    gap: 8px;
}

.mode-btn:hover { 
    color: var(--text-primary); 
    background: var(--bg-elevated);
}

.mode-btn.active {
    background: var(--gradient-brand);
    color: #fff;
    box-shadow: 0 4px 15px rgba(139, 92, 246, 0.4);
}

.mode-icon { font-size: 1rem; }

.status-bar {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.78rem;
    color: var(--text-secondary);
}

.pulse-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--green);
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; box-shadow: 0 0 0 0 var(--green-dim); }
    50% { opacity: 0.6; box-shadow: 0 0 0 8px transparent; }
}

/* ═══ 区域切换 ═══ */
.area {
    display: none;
    flex: 1;
    position: relative;
    z-index: 1;
    width: 100%;
}

/* ═══ 共享组件样式 ═══ */

.sidebar-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.sidebar-header h2 {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-primary);
}

.btn-ghost {
    font-family: var(--font-body);
    font-size: 0.78rem;
    padding: 6px 12px;
    border: 1px solid var(--border);
    border-radius: 14px;
    background: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s;
}
.btn-ghost:hover { border-color: var(--purple-primary); color: var(--purple-bright); background: var(--purple-dim); }

.difficulty-filter {
    display: flex;
    gap: 4px;
    flex-wrap: wrap;
}

.filter-chip {
    font-family: var(--font-body);
    font-size: 0.75rem;
    padding: 5px 14px;
    border-radius: 16px;
    border: 1px solid var(--border);
    background: transparent;
    color: var(--text-muted);
    cursor: pointer;
    transition: all 0.2s;
}
.filter-chip:hover { border-color: var(--purple-primary); color: var(--purple-bright); }
.filter-chip.active {
    background: var(--gradient-brand);
    border-color: transparent;
    color: #fff;
}

.challenge-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
    flex: 1;
    overflow-y: auto;
}

.challenge-card {
    padding: 14px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border);
    background: var(--gradient-card);
    cursor: pointer;
    transition: all 0.25s ease;
}
.challenge-card:hover {
    border-color: var(--purple-primary);
    transform: translateX(3px);
    box-shadow: -3px 0 0 var(--purple-primary), 0 4px 15px rgba(139, 92, 246, 0.2);
}
.challenge-card.active {
    border-color: var(--purple-primary);
    background: linear-gradient(145deg, rgba(139, 92, 246, 0.15), rgba(236, 72, 153, 0.1));
    box-shadow: -3px 0 0 var(--purple-primary);
}

.challenge-card .cc-title {
    font-size: 0.88rem;
    font-weight: 600;
    margin-bottom: 4px;
}

.challenge-card .cc-meta {
    display: flex;
    gap: 6px;
    align-items: center;
}

.tag {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    padding: 3px 8px;
    border-radius: 10px;
    line-height: 1.5;
    text-transform: uppercase;
    font-weight: 500;
}

.tag-trap { background: rgba(236, 72, 153, 0.2); color: #f472b6; border: none; }
.tag-category { background: rgba(99, 102, 241, 0.2); color: #a5b4fc; border: none; }
.tag-difficulty { background: rgba(245, 158, 11, 0.2); color: #fbbf24; border: none; }

/* ═══ 挑战卡片样式（用于实战演练） ═══ */
.challenge-detail {
    background: var(--gradient-card);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border);
    padding: 24px;
    min-height: 200px;
}

.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 40px;
    color: var(--text-muted);
    text-align: center;
    gap: 10px;
}
.empty-state.small { padding: 20px; }

.flask-icon {
    font-size: 3rem;
    opacity: 0.4;
    filter: grayscale(0.5);
}

.flask-icon svg {
    width: 48px;
    height: 48px;
}

.empty-state h3 { font-size: 1.1rem; color: var(--text-secondary); }
.empty-state p { font-size: 0.85rem; }

/* 挑战详情 */
.cd-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 16px;
}

.cd-title {
    font-size: 1.3rem;
    font-weight: 700;
    background: var(--gradient-brand);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.cd-tags { display: flex; gap: 6px; }

.cd-scenario {
    font-size: 0.92rem;
    line-height: 1.7;
    color: var(--text-secondary);
    padding: 14px;
    border-radius: var(--radius-md);
    background: var(--bg-surface);
    border-left: 3px solid var(--purple-primary);
    margin-bottom: 14px;
}

.cd-question {
    font-size: 1rem;
    font-weight: 600;
    color: var(--yellow);
    margin-bottom: 12px;
}

.cd-actions { display: flex; gap: 8px; margin-top: 16px; }

/* ── 数据生成器 ── */
.generator-section {
    background: var(--gradient-card);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border);
    padding: 20px;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
}

.section-header h3 {
    font-size: 1rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 8px;
}

.icon-beaker { font-size: 1.2rem; }

.section-tag {
    font-family: var(--font-mono);
    font-size: 0.6rem;
    letter-spacing: 0.15em;
    color: var(--text-muted);
    text-transform: uppercase;
}

.generator-controls {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 12px;
    margin-bottom: 16px;
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.control-group label {
    font-size: 0.72rem;
    font-weight: 500;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

select, input[type="number"], input[type="text"] {
    font-family: var(--font-mono);
    font-size: 0.82rem;
    padding: 10px 14px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
    background: var(--bg-surface);
    color: var(--text-primary);
    outline: none;
    transition: all 0.2s;
}
select:focus, input[type="number"]:focus, input[type="text"]:focus { 
    border-color: var(--purple-primary); 
    box-shadow: 0 0 0 3px var(--purple-dim);
}
input[type="text"]::placeholder {
    color: var(--text-muted);
}

.generator-actions {
    display: flex;
    gap: 8px;
}

/* 按钮系统 */
.btn-primary, .btn-secondary, .btn-warning, .btn-accent {
    font-family: var(--font-body);
    font-size: 0.85rem;
    font-weight: 600;
    padding: 12px 24px;
    border: none;
    border-radius: 20px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: all 0.25s ease;
}

.btn-primary {
    background: var(--gradient-brand);
    color: #fff;
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 6px 20px rgba(139, 92, 246, 0.4); }

.btn-secondary {
    background: var(--bg-elevated);
    color: var(--text-secondary);
    border: 1px solid var(--border);
}
.btn-secondary:hover { border-color: var(--purple-primary); color: var(--purple-bright); }

.btn-warning {
    background: var(--gradient-3);
    color: #fff;
}
.btn-warning:hover { transform: translateY(-2px); box-shadow: 0 6px 20px rgba(236, 72, 153, 0.4); }

.btn-accent {
    background: var(--gradient-4);
    color: #fff;
}
.btn-accent:hover { transform: translateY(-2px); box-shadow: 0 6px 20px rgba(245, 158, 11, 0.4); }

.full-width { width: 100%; justify-content: center; }

.btn-icon { font-size: 1rem; }

/* 生成结果 */
.gen-result {
    margin-top: 16px;
    padding: 14px;
    border-radius: var(--radius-md);
    background: var(--bg-surface);
    border: 1px solid var(--border);
    font-family: var(--font-mono);
    font-size: 0.78rem;
    line-height: 1.6;
}

.hidden { display: none !important; }

/* ── 右面板 ── */
.data-preview-panel {
    background: var(--bg-surface);
    border-left: 1px solid var(--border);
    padding: 16px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.panel-header h3 { font-size: 1rem; font-weight: 700; }

.count-badge {
    font-family: var(--font-mono);
    font-size: 0.68rem;
    padding: 3px 10px;
    border-radius: 12px;
    background: var(--purple-dim);
    color: var(--purple-bright);
}

.data-table-wrap {
    flex: 1;
    overflow: auto;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    font-family: var(--font-mono);
    font-size: 0.72rem;
}

.data-table th {
    position: sticky;
    top: 0;
    background: var(--bg-elevated);
    padding: 8px 10px;
    text-align: left;
    font-weight: 600;
    color: var(--purple-bright);
    border-bottom: 2px solid var(--border-bright);
    white-space: nowrap;
}

.data-table td {
    padding: 6px 10px;
    border-bottom: 1px solid var(--border);
    white-space: nowrap;
    color: var(--text-secondary);
}

.data-table tr:hover td { background: rgba(139, 92, 246, 0.08); color: var(--text-primary); }

.data-stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
}

.stat-box {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 10px;
    text-align: center;
}

.stat-box .stat-label {
    font-size: 0.65rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.stat-box .stat-value {
    font-family: var(--font-display);
    font-size: 1.3rem;
    font-weight: 700;
    margin-top: 2px;
}

.stat-value.val-cyan { color: var(--purple-bright); }
.stat-value.val-magenta { color: var(--magenta); }
.stat-value.val-yellow { color: var(--yellow); }
.stat-value.val-blue { color: var(--blue); }

/* ═══ 实验工具箱布局 ═══ */
#console-area {
    padding: 0;
    height: calc(100vh - 60px - 40px);
    overflow: hidden;
}
#console-area.active { display: block; }

.console-layout {
    display: grid;
    grid-template-columns: 280px 1fr;
    height: 100%;
}

/* ── 工具箱左侧导航 ── */
.console-sidebar {
    background: var(--bg-card);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    overflow-y: auto;
}

.console-sidebar-header {
    padding: 20px 20px 16px;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-shrink: 0;
}

.console-sidebar-header h3 {
    font-size: 1.1rem;
    font-weight: 700;
}

.console-sidebar-count {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    padding: 3px 10px;
    border-radius: 10px;
    background: var(--bg-elevated);
    color: var(--text-muted);
}

.console-nav-list {
    padding: 10px;
    display: flex;
    flex-direction: column;
    gap: 4px;
    flex: 1;
}

.console-nav-item {
    font-family: var(--font-body);
    display: flex;
    align-items: center;
    gap: 12px;
    width: 100%;
    padding: 14px 14px;
    border-radius: 12px;
    border: 1px solid transparent;
    background: transparent;
    cursor: pointer;
    transition: all 0.2s ease;
    text-align: left;
}

.console-nav-item:hover {
    background: var(--bg-elevated);
    border-color: var(--border);
}

.console-nav-item.active {
    background: rgba(139, 92, 246, 0.1);
    border-color: var(--purple-primary);
}

.console-nav-icon {
    width: 40px;
    height: 40px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    flex-shrink: 0;
}

.console-nav-info {
    display: flex;
    flex-direction: column;
    gap: 2px;
    min-width: 0;
}

.console-nav-title {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.console-nav-item.active .console-nav-title {
    color: var(--purple-bright);
}

.console-nav-desc {
    font-family: var(--font-mono);
    font-size: 0.62rem;
    color: var(--text-muted);
    letter-spacing: 0.03em;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* ── 工具箱右侧内容区 ── */
.console-content {
    overflow-y: auto;
    padding: 32px 40px;
}

.console-tool-panel {
    display: none;
    max-width: 720px;
    animation: fadeInUp 0.25s ease-out;
}

#tool-panel-metric {
    max-width: 1100px;
}

.console-tool-panel.active {
    display: block;
}

.console-tool-header {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 28px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border);
}

.console-tool-header .card-icon {
    width: 52px;
    height: 52px;
    font-size: 1.6rem;
}

.console-tool-header h2 {
    font-size: 1.4rem;
    font-weight: 700;
}

.console-tool-header .card-subtitle {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    color: var(--text-muted);
    letter-spacing: 0.04em;
    margin-top: 4px;
}

/* ── 工具 → 课程联动卡片 ── */

.tool-learn-card {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 8px;
    padding: 10px 14px;
    margin-bottom: 20px;
    border-radius: 10px;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.08), rgba(139, 92, 246, 0.06));
    border: 1px solid rgba(99, 102, 241, 0.15);
    animation: fadeIn 0.3s ease;
}

.tool-learn-icon {
    font-size: 0.9rem;
    flex-shrink: 0;
}

.tool-learn-text {
    font-size: 0.78rem;
    color: var(--text-secondary);
    flex-shrink: 0;
}

.tool-learn-links {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-left: auto;
}

.tool-learn-links a {
    font-size: 0.72rem;
    padding: 3px 10px;
    border-radius: 12px;
    background: rgba(99, 102, 241, 0.12);
    color: #a5b4fc;
    cursor: pointer;
    transition: all 0.2s ease;
    white-space: nowrap;
    text-decoration: none;
}

.tool-learn-links a:hover {
    background: rgba(99, 102, 241, 0.25);
    color: #c4b5fd;
}

/* 结果区域的课程关联提示 */
.tool-result-learn-tip {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 8px;
    padding: 8px 12px;
    margin-top: 12px;
    border-radius: 8px;
    background: rgba(245, 158, 11, 0.06);
    border: 1px dashed rgba(245, 158, 11, 0.2);
    font-size: 0.75rem;
    color: var(--text-muted);
    animation: fadeIn 0.4s ease;
}

.tool-result-learn-tip .tool-learn-icon {
    font-size: 0.85rem;
}

.tool-tip-link {
    font-size: 0.72rem;
    padding: 2px 8px;
    border-radius: 10px;
    background: rgba(245, 158, 11, 0.1);
    color: #fbbf24;
    cursor: pointer;
    transition: all 0.2s ease;
    white-space: nowrap;
    text-decoration: none;
}

.tool-tip-link:hover {
    background: rgba(245, 158, 11, 0.2);
    color: #fcd34d;
}

.console-tool-body {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.console-tool-body label {
    font-size: 0.78rem;
    font-weight: 500;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.06em;
}

.console-tool-body select {
    width: 100%;
}

/* 旧的 console-grid 兼容 (hidden) */
.console-grid {
    display: none;
}

.console-card {
    background: var(--gradient-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all 0.3s ease;
    box-shadow: 0 4px 20px rgba(0,0,0,0.2);
}

.console-card:hover {
    border-color: var(--purple-primary);
    box-shadow: 0 8px 32px rgba(139, 92, 246, 0.15);
    transform: translateY(-2px);
}

.card-header {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 18px 20px;
    border-bottom: 1px solid var(--border);
    background: rgba(139, 92, 246, 0.05);
}

.card-icon {
    width: 44px;
    height: 44px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4rem;
    flex-shrink: 0;
}

.card-icon.gradient-1 { background: var(--gradient-1); }
.card-icon.gradient-2 { background: var(--gradient-2); }
.card-icon.gradient-3 { background: var(--gradient-3); }
.card-icon.gradient-4 { background: var(--gradient-4); }
.card-icon.gradient-5 { background: linear-gradient(135deg, #06b6d4, #8b5cf6); }
.card-icon.gradient-6 { background: linear-gradient(135deg, #f59e0b, #ef4444); }
.card-icon.gradient-7 { background: linear-gradient(135deg, #10b981, #06b6d4); }
.gradient-7 { background: linear-gradient(135deg, #10b981, #06b6d4); }

.card-header h3 { font-size: 1.05rem; font-weight: 700; }
.card-subtitle {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    color: var(--text-muted);
    letter-spacing: 0.05em;
    margin-top: 2px;
}

.card-body {
    padding: 18px 20px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.card-body label {
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.06em;
}

.card-body select {
    width: 100%;
}

.input-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
}

.input-field {
    display: flex;
    flex-direction: column;
    gap: 4px;
    position: relative;
}

/* 字段帮助图标 */
.field-help-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 16px;
    height: 16px;
    font-size: 10px;
    font-weight: 700;
    color: rgba(255,255,255,0.5);
    background: rgba(255,255,255,0.08);
    border: 1px solid rgba(255,255,255,0.12);
    border-radius: 50%;
    cursor: pointer;
    margin-left: 6px;
    transition: all 0.2s;
    vertical-align: middle;
    line-height: 1;
}
.field-help-icon:hover {
    color: #a78bfa;
    background: rgba(167,139,250,0.15);
    border-color: rgba(167,139,250,0.3);
    transform: scale(1.1);
}

/* 帮助卡片 */
.field-help-card {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    z-index: 100;
    margin-top: 6px;
    padding: 14px 16px;
    background: linear-gradient(135deg, rgba(30,27,55,0.98), rgba(40,35,70,0.98));
    border: 1px solid rgba(167,139,250,0.25);
    border-radius: 12px;
    backdrop-filter: blur(20px);
    box-shadow: 0 8px 32px rgba(0,0,0,0.4), 0 0 0 1px rgba(167,139,250,0.1);
    animation: helpCardIn 0.25s ease-out;
    min-width: 280px;
}
.field-help-card.show {
    display: block;
}
@keyframes helpCardIn {
    from { opacity: 0; transform: translateY(-6px); }
    to { opacity: 1; transform: translateY(0); }
}
.help-title {
    font-size: 0.82rem;
    font-weight: 700;
    color: #e2e0ff;
    margin-bottom: 8px;
}
.help-desc {
    font-size: 0.78rem;
    color: rgba(255,255,255,0.7);
    line-height: 1.6;
    margin-bottom: 10px;
}
.help-desc strong {
    color: #a78bfa;
    font-weight: 600;
}
.help-example {
    background: rgba(167,139,250,0.08);
    border: 1px solid rgba(167,139,250,0.15);
    border-radius: 8px;
    padding: 10px 12px;
    font-size: 0.76rem;
    color: rgba(255,255,255,0.75);
    line-height: 1.6;
    margin-bottom: 8px;
}
.help-example strong {
    color: #c4b5fd;
}
.help-example-tag {
    display: inline-block;
    font-size: 0.7rem;
    font-weight: 600;
    color: #a78bfa;
    margin-bottom: 4px;
}
.help-tip {
    font-size: 0.72rem;
    color: rgba(255,255,255,0.45);
    line-height: 1.5;
    padding-top: 6px;
    border-top: 1px solid rgba(255,255,255,0.06);
}

.input-field input {
    width: 100%;
}

h4 {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
    padding-bottom: 6px;
    border-bottom: 1px solid var(--border);
}

/* 指标结果 */
.metric-result {
    min-height: 40px;
}

.metric-card {
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 14px;
}

.metric-card h5 {
    font-size: 0.9rem;
    margin-bottom: 10px;
    color: var(--purple-bright);
}

.metric-list {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.metric-item {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.82rem;
    padding: 4px 0;
}

.metric-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    flex-shrink: 0;
}

.metric-dot.primary { background: var(--purple-primary); }
.metric-dot.guardrail { background: var(--magenta); }

.oec-suggestion {
    margin-top: 10px;
    padding: 10px;
    border-radius: var(--radius-sm);
    background: var(--yellow-dim);
    border-left: 3px solid var(--yellow);
    font-size: 0.82rem;
    color: var(--yellow);
    line-height: 1.6;
}

/* ── 指标设计向导 Tab 切换 ── */
.metric-tabs {
    display: flex;
    gap: 4px;
    background: var(--bg-surface);
    border-radius: 10px;
    padding: 4px;
    border: 1px solid var(--border);
}

.metric-tab {
    flex: 1;
    padding: 10px 16px;
    border: none;
    border-radius: 8px;
    background: transparent;
    color: var(--text-muted);
    font-family: var(--font-body);
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

.metric-tab:hover {
    color: var(--text-primary);
    background: var(--bg-elevated);
}

.metric-tab.active {
    background: var(--purple-primary);
    color: #fff;
    box-shadow: 0 2px 8px rgba(139, 92, 246, 0.3);
}

.metric-tab-content {
    display: none;
}

.metric-tab-content.active {
    display: flex;
    flex-direction: column;
    gap: 16px;
    animation: fadeInUp 0.25s ease-out;
}

/* ── AI 指标设计结果 ── */
.loading-indicator {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 20px;
    color: var(--text-muted);
    font-size: 0.85rem;
}

.loading-spinner {
    width: 20px;
    height: 20px;
    border: 2px solid var(--border);
    border-top-color: var(--purple-primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.ai-metric-result {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.aim-summary {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    padding: 14px 16px;
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    font-size: 0.88rem;
    line-height: 1.6;
    color: var(--text-primary);
}

.aim-summary-icon {
    font-size: 1.2rem;
    flex-shrink: 0;
    margin-top: 1px;
}

.aim-section {
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.aim-section-header {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 16px;
    font-weight: 600;
    font-size: 0.9rem;
}

.aim-section-header.aim-core {
    background: rgba(139, 92, 246, 0.08);
    border-bottom: 1px solid rgba(139, 92, 246, 0.15);
    color: var(--purple-bright);
}

.aim-section-header.aim-process {
    background: rgba(6, 182, 212, 0.08);
    border-bottom: 1px solid rgba(6, 182, 212, 0.15);
    color: var(--cyan);
}

.aim-section-header.aim-guardrail {
    background: rgba(236, 72, 153, 0.08);
    border-bottom: 1px solid rgba(236, 72, 153, 0.15);
    color: var(--magenta);
}

.aim-section-icon {
    font-size: 1.1rem;
}

.aim-section-title {
    flex: 1;
}

.aim-section-badge {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    padding: 2px 8px;
    border-radius: 8px;
    background: rgba(255,255,255,0.08);
}

.aim-section-desc {
    padding: 8px 16px;
    font-size: 0.72rem;
    color: var(--text-muted);
    border-bottom: 1px solid var(--border);
}

.aim-items {
    padding: 8px 12px;
}

.aim-item {
    padding: 12px;
    border-radius: var(--radius-sm);
    margin-bottom: 6px;
    border-left: 3px solid transparent;
    transition: background 0.15s ease;
}

.aim-item:last-child { margin-bottom: 0; }

.aim-item:hover { background: var(--bg-elevated); }

.aim-item.aim-core { border-left-color: var(--purple-primary); }
.aim-item.aim-process { border-left-color: var(--cyan); }
.aim-item.aim-guardrail { border-left-color: var(--magenta); }

.aim-item-header {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 6px;
}

.aim-item-name {
    font-weight: 600;
    font-size: 0.88rem;
    color: var(--text-primary);
}

.aim-item-def {
    font-family: var(--font-mono);
    font-size: 0.76rem;
    color: var(--text-secondary);
    padding: 6px 10px;
    background: var(--bg-elevated);
    border-radius: 6px;
    margin-bottom: 6px;
    line-height: 1.5;
}

.aim-item-reason {
    font-size: 0.78rem;
    color: var(--text-muted);
    line-height: 1.5;
}

.aim-threshold {
    margin-top: 6px;
    font-size: 0.76rem;
    color: var(--yellow);
    padding: 4px 8px;
    background: var(--yellow-dim);
    border-radius: 4px;
    display: inline-block;
}

.aim-oec {
    padding: 14px 16px;
    background: var(--yellow-dim);
    border: 1px solid rgba(250, 204, 21, 0.2);
    border-left: 3px solid var(--yellow);
    border-radius: var(--radius-md);
}

.aim-oec-label {
    font-weight: 600;
    font-size: 0.85rem;
    color: var(--yellow);
    margin-bottom: 6px;
}

.aim-oec-text {
    font-size: 0.82rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.aim-tips {
    padding: 14px 16px;
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
}

.aim-tips-label {
    font-weight: 600;
    font-size: 0.85rem;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.aim-tips ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.aim-tips li {
    font-size: 0.8rem;
    color: var(--text-muted);
    line-height: 1.6;
    padding: 3px 0 3px 16px;
    position: relative;
}

.aim-tips li::before {
    content: "•";
    position: absolute;
    left: 0;
    color: var(--purple-primary);
}

.ai-metric-raw {
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 16px;
}

.ai-metric-raw pre {
    white-space: pre-wrap;
    word-break: break-word;
    font-size: 0.82rem;
    color: var(--text-secondary);
    line-height: 1.6;
    margin: 0;
}

/* ── 指标结果 + 对话 左右分栏 ── */
.metric-design-layout {
    display: grid;
    grid-template-columns: 1fr 360px;
    gap: 20px;
    align-items: start;
}

.metric-design-left {
    min-width: 0;
}

.metric-design-right {
    position: sticky;
    top: 0;
}

/* ── 指标优化对话区 ── */
.metric-chat-area {
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    overflow: hidden;
    background: var(--bg-surface);
    display: flex;
    flex-direction: column;
    height: calc(100vh - 260px);
    max-height: 680px;
}

.metric-chat-header {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 16px;
    background: var(--bg-elevated);
    border-bottom: 1px solid var(--border);
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-primary);
    flex-shrink: 0;
}

.metric-chat-icon {
    font-size: 1.1rem;
}

.metric-chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.mchat-welcome {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 30px 16px;
    color: var(--text-muted);
    gap: 6px;
    flex: 1;
}

.mchat-welcome-icon {
    font-size: 2rem;
    margin-bottom: 4px;
    opacity: 0.6;
}

.mchat-welcome p {
    font-size: 0.88rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin: 0;
}

.mchat-welcome span {
    font-size: 0.72rem;
    line-height: 1.5;
}

.mchat-msg {
    display: flex;
    gap: 10px;
    align-items: flex-start;
    animation: fadeInUp 0.2s ease-out;
}

.mchat-user {
    flex-direction: row-reverse;
}

.mchat-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.9rem;
    flex-shrink: 0;
}

.mchat-avatar-user {
    background: linear-gradient(135deg, var(--purple-primary), var(--magenta));
}

.mchat-avatar-ai {
    background: linear-gradient(135deg, #06b6d4, #8b5cf6);
}

.mchat-bubble {
    max-width: 85%;
    padding: 10px 14px;
    border-radius: 14px;
    font-size: 0.84rem;
    line-height: 1.65;
}

.mchat-bubble-user {
    background: var(--purple-primary);
    color: #fff;
    border-bottom-right-radius: 4px;
}

.mchat-bubble-ai {
    background: var(--bg-elevated);
    color: var(--text-primary);
    border: 1px solid var(--border);
    border-bottom-left-radius: 4px;
}

.mchat-bubble-ai.mchat-error {
    border-color: rgba(239, 68, 68, 0.3);
    color: #ef4444;
}

.mchat-reply-content p { margin: 0 0 8px; }
.mchat-reply-content p:last-child { margin-bottom: 0; }
.mchat-reply-content strong { color: var(--purple-bright); }
.mchat-reply-content code {
    font-family: var(--font-mono);
    font-size: 0.78rem;
    padding: 1px 5px;
    border-radius: 4px;
    background: var(--bg-surface);
}
.mchat-reply-content ul,
.mchat-reply-content ol {
    margin: 4px 0;
    padding-left: 18px;
}
.mchat-reply-content li {
    margin-bottom: 2px;
}

.mchat-thinking {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text-muted);
    font-size: 0.82rem;
}

.mchat-update-notice {
    margin-top: 10px;
    padding: 8px 12px;
    background: rgba(16, 185, 129, 0.1);
    border: 1px solid rgba(16, 185, 129, 0.25);
    border-radius: 8px;
    color: #10b981;
    font-size: 0.8rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

.mchat-update-notice:hover {
    background: rgba(16, 185, 129, 0.18);
}

.metric-chat-input-area {
    display: flex;
    gap: 8px;
    padding: 12px 16px;
    border-top: 1px solid var(--border);
    background: var(--bg-card);
    align-items: flex-end;
}

.metric-chat-input {
    flex: 1;
    resize: none;
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 10px 14px;
    font-family: var(--font-body);
    font-size: 0.84rem;
    color: var(--text-primary);
    background: var(--bg-surface);
    outline: none;
    transition: border-color 0.2s ease;
    line-height: 1.5;
}

.metric-chat-input:focus {
    border-color: var(--purple-primary);
}

.metric-chat-input::placeholder {
    color: var(--text-muted);
    font-size: 0.78rem;
}

.metric-chat-send {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: none;
    background: linear-gradient(135deg, var(--purple-primary), var(--magenta));
    color: #fff;
    font-size: 1rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: all 0.2s ease;
}

.metric-chat-send:hover {
    transform: scale(1.05);
    box-shadow: 0 4px 12px rgba(139, 92, 246, 0.35);
}

.metric-chat-send:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.aim-updated-badge {
    display: inline-block;
    padding: 5px 12px;
    background: rgba(16, 185, 129, 0.12);
    border: 1px solid rgba(16, 185, 129, 0.25);
    border-radius: 8px;
    color: #10b981;
    font-size: 0.78rem;
    font-weight: 500;
    margin-bottom: 12px;
    animation: fadeInUp 0.3s ease-out;
}

/* 计算结果 */
.calc-result {
    min-height: 20px;
}

.result-box {
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 14px;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    line-height: 1.7;
}

.result-box .result-title {
    font-family: var(--font-body);
    font-size: 0.9rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.result-pass {
    border-left: 3px solid var(--green);
}

.result-fail {
    border-left: 3px solid var(--magenta);
}

.result-warn {
    border-left: 3px solid var(--yellow);
}

.result-line {
    display: flex;
    justify-content: space-between;
    padding: 2px 0;
    border-bottom: 1px dashed var(--border);
}

.result-key { color: var(--text-muted); }
.result-val { color: var(--text-primary); font-weight: 600; }

.result-verdict {
    margin-top: 10px;
    padding: 10px;
    border-radius: var(--radius-sm);
    font-family: var(--font-body);
    font-size: 0.88rem;
    font-weight: 600;
    line-height: 1.5;
}

.verdict-pass { background: var(--green-dim); color: var(--green); }
.verdict-fail { background: var(--magenta-dim); color: var(--magenta); }
.verdict-warn { background: var(--yellow-dim); color: var(--yellow); }

/* 上传区 */
.upload-zone {
    border: 2px dashed var(--border);
    border-radius: var(--radius-md);
    padding: 28px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s;
    background: var(--bg-surface);
}
.upload-zone:hover {
    border-color: var(--purple-primary);
    background: var(--purple-dim);
}

.upload-icon { font-size: 2rem; color: var(--text-muted); margin-bottom: 6px; }
.upload-zone p { font-size: 0.88rem; color: var(--text-secondary); }
.upload-hint { font-size: 0.72rem; color: var(--text-muted); }

/* CSV 分析结果 */
.analysis-report {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.report-section {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 12px;
}

.report-section h5 {
    font-size: 0.82rem;
    color: var(--text-secondary);
    margin-bottom: 8px;
    font-weight: 600;
}

.tool-textarea {
    width: 100%;
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    padding: 10px 12px;
    font-size: 0.85rem;
    font-family: inherit;
    resize: vertical;
    transition: border-color 0.2s;
    line-height: 1.5;
}
.tool-textarea:focus {
    outline: none;
    border-color: var(--purple-primary);
    box-shadow: 0 0 0 2px rgba(139, 92, 246, 0.2);
}
.tool-textarea::placeholder {
    color: var(--text-muted);
}

@media (max-width: 1200px) {
    .console-layout { grid-template-columns: 240px 1fr; }
    .metric-design-layout { grid-template-columns: 1fr; }
    .metric-design-right { position: static; }
    .metric-chat-area { height: 400px; max-height: 400px; }
}

/* ═══ 底部 ═══ */
.bottom-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 24px;
    height: 40px;
    background: var(--bg-surface);
    border-top: 1px solid var(--border);
    font-size: 0.72rem;
    color: var(--text-muted);
    flex-shrink: 0;
}

.footer-tagline {
    font-style: italic;
    opacity: 0.6;
}

.footer-stats {
    font-size: 0.68rem;
    opacity: 0.5;
    letter-spacing: 0.02em;
}

/* ═══════════════════════════════════════════════════════════
   知识区 - AI Agent 聊天界面
   ═══════════════════════════════════════════════════════════ */

#knowledge-area {
    display: none;
    height: calc(100vh - 60px - 40px);
    overflow: hidden;
    width: 100%;
}

#knowledge-area.active {
    display: flex;
}

.knowledge-container {
    display: grid;
    grid-template-columns: 260px 1fr 280px;
    height: 100%;
    width: 100%;
    gap: 0;
    overflow: hidden;
}

/* ── 左侧快捷问题 ── */
.knowledge-sidebar {
    background: var(--bg-surface);
    border-right: 1px solid var(--border);
    padding: 16px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.quick-questions {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.quick-q-btn {
    font-family: var(--font-body);
    font-size: 0.82rem;
    padding: 12px 14px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border);
    background: var(--gradient-card);
    color: var(--text-secondary);
    cursor: pointer;
    text-align: left;
    display: flex;
    align-items: center;
    gap: 10px;
    transition: all 0.25s ease;
}

.quick-q-btn:hover {
    border-color: var(--purple-primary);
    color: var(--text-primary);
    transform: translateX(4px);
    box-shadow: 0 4px 12px rgba(139, 92, 246, 0.15);
}

.quick-q-btn .q-icon {
    font-size: 1rem;
    flex-shrink: 0;
}

/* ── 中间聊天面板 ── */
.chat-panel {
    display: flex;
    flex-direction: column;
    background: var(--bg-deep);
    height: 100%;
    overflow-y: auto;
    overflow-x: hidden;
    min-width: 0;
}

.chat-header {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 16px 20px;
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.1), rgba(236, 72, 153, 0.05));
    border-bottom: 1px solid var(--border);
}

.agent-avatar {
    flex-shrink: 0;
}

.agent-avatar svg {
    width: 44px;
    height: 44px;
    max-width: 44px;
    max-height: 44px;
}

.agent-info h3 {
    font-size: 1.1rem;
    font-weight: 700;
    background: var(--gradient-brand);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.agent-status {
    font-size: 0.75rem;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 6px;
}

.agent-status .status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--green);
    animation: pulse 2s ease-in-out infinite;
}

.chat-header .btn-ghost {
    margin-left: auto;
}

/* ── 模型选择器 ── */
.model-selector {
    margin-left: 12px;
}

.model-selector select {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 6px 12px;
    font-size: 0.8rem;
    color: var(--text);
    cursor: pointer;
    outline: none;
    transition: all 0.2s;
}

.model-selector select:hover {
    border-color: var(--purple);
}

.model-selector select:focus {
    border-color: var(--purple);
    box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.15);
}

/* ── 系统消息 ── */
.system-message {
    justify-content: center;
    max-width: 100%;
}

.system-message-text {
    font-size: 0.75rem;
    color: var(--text-muted);
    background: var(--bg-card);
    padding: 6px 12px;
    border-radius: 12px;
    border: 1px dashed var(--border);
}

/* ── 聊天消息区 ── */
.chat-messages {
    flex: 0 0 auto;
    overflow: visible;
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.message {
    display: flex;
    gap: 12px;
    max-width: 85%;
    animation: fadeInUp 0.3s ease-out;
    flex-shrink: 0;
}

.message.agent-message {
    align-self: flex-start;
}

.message.user-message {
    align-self: flex-end;
    flex-direction: row-reverse;
}

.message-avatar {
    width: 36px;
    height: 36px;
    min-width: 36px;
    min-height: 36px;
    max-width: 36px;
    max-height: 36px;
    border-radius: 50%;
    background: var(--gradient-brand);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    overflow: hidden;
    color: #fff;
}

.message-avatar svg {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
}

.user-message .message-avatar {
    background: var(--bg-elevated);
    border: 1px solid var(--border);
}

.message-content {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.message-text {
    padding: 14px 18px;
    border-radius: 18px;
    font-size: 0.9rem;
    line-height: 1.6;
}

.agent-message .message-text {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-top-left-radius: 4px;
}

.user-message .message-text {
    background: var(--gradient-brand);
    color: #fff;
    border-top-right-radius: 4px;
}

.message-text ul {
    margin: 8px 0 0 16px;
    padding: 0;
}

.message-text li {
    margin: 4px 0;
}

.message-text strong {
    color: var(--purple-bright);
}

.user-message .message-text strong {
    color: #fff;
}

.message-time {
    font-size: 0.68rem;
    color: var(--text-muted);
    padding: 0 8px;
}

.user-message .message-time {
    text-align: right;
}

/* ── RAG 来源引用标签 ── */
.rag-sources {
    margin-top: 10px;
    padding: 10px 12px;
    background: rgba(139, 92, 246, 0.08);
    border: 1px solid rgba(139, 92, 246, 0.2);
    border-radius: 8px;
}

.rag-sources-label {
    font-size: 0.72rem;
    color: var(--purple-bright);
    margin-bottom: 6px;
    font-weight: 600;
    letter-spacing: 0.3px;
}

.rag-sources-list {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.rag-source-tag {
    display: inline-block;
    font-size: 0.7rem;
    padding: 3px 8px;
    background: rgba(139, 92, 246, 0.15);
    color: var(--purple-bright);
    border-radius: 12px;
    border: 1px solid rgba(139, 92, 246, 0.25);
    cursor: default;
    transition: background 0.2s;
    max-width: 280px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.rag-source-tag:hover {
    background: rgba(139, 92, 246, 0.25);
}

.rag-source-tag.rag-source-book {
    background: rgba(59, 130, 246, 0.15);
    color: var(--blue-bright, #60a5fa);
    border-color: rgba(59, 130, 246, 0.25);
}

.rag-source-tag.rag-source-book:hover {
    background: rgba(59, 130, 246, 0.25);
}

/* ── 输入区域 ── */
.chat-input-area {
    padding: 16px 20px;
    background: var(--bg-surface);
    border-top: 1px solid var(--border);
    position: sticky;
    bottom: 0;
    z-index: 10;
}

.input-wrapper {
    display: flex;
    align-items: flex-end;
    gap: 12px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 24px;
    padding: 8px 8px 8px 18px;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.input-wrapper:focus-within {
    border-color: var(--purple-primary);
    box-shadow: 0 0 0 3px var(--purple-dim);
}

#chat-input {
    flex: 1;
    border: none;
    background: transparent;
    font-family: var(--font-body);
    font-size: 0.92rem;
    color: var(--text-primary);
    resize: none;
    outline: none;
    max-height: 120px;
    line-height: 1.5;
}

#chat-input::placeholder {
    color: var(--text-muted);
}

.send-btn {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: none;
    background: var(--gradient-brand);
    color: #fff;
    font-size: 1.1rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
    flex-shrink: 0;
}

.send-btn:hover {
    transform: scale(1.05);
    box-shadow: 0 4px 15px rgba(139, 92, 246, 0.4);
}

.send-btn:active {
    transform: scale(0.95);
}

.input-hints {
    text-align: center;
    font-size: 0.7rem;
    color: var(--text-muted);
    margin-top: 8px;
}

/* ── 右侧知识库 ── */
.knowledge-base-panel {
    background: var(--bg-surface);
    border-left: 1px solid var(--border);
    padding: 16px;
    overflow-y: auto;
}

.knowledge-topics {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.topic-card {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border);
    background: var(--gradient-card);
    cursor: pointer;
    transition: all 0.25s ease;
}

.topic-card:hover {
    border-color: var(--purple-primary);
    transform: translateX(-4px);
    box-shadow: 0 4px 12px rgba(139, 92, 246, 0.15);
}

.topic-icon {
    font-size: 1.5rem;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    background: var(--purple-dim);
}

.topic-info h4 {
    font-size: 0.88rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0 0 2px;
    border: none;
    padding: 0;
}

.topic-info p {
    font-size: 0.72rem;
    color: var(--text-muted);
    margin: 0;
}

/* ── 打字动画 ── */
.typing-indicator {
    display: flex;
    gap: 4px;
    padding: 14px 18px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 18px;
    border-top-left-radius: 4px;
}

.typing-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--purple-primary);
    animation: typingBounce 1.4s ease-in-out infinite;
}

.typing-dot:nth-child(2) { animation-delay: 0.2s; }
.typing-dot:nth-child(3) { animation-delay: 0.4s; }

@keyframes typingBounce {
    0%, 60%, 100% { transform: translateY(0); opacity: 0.4; }
    30% { transform: translateY(-6px); opacity: 1; }
}

/* ═══ 动画 ═══ */
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(12px); }
    to { opacity: 1; transform: translateY(0); }
}

.animate-in {
    animation: fadeInUp 0.35s ease-out forwards;
}

/* ═══ 滚动条 ═══ */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--border-bright); }

/* ═══ 响应式 ═══ */
@media (max-width: 1200px) {
    .knowledge-container {
        grid-template-columns: 220px 1fr 240px;
    }
}

@media (max-width: 900px) {
    .console-layout { grid-template-columns: 1fr; }
    .console-sidebar { 
        display: flex;
        flex-direction: row;
        overflow-x: auto;
        overflow-y: hidden;
        border-right: none;
        border-bottom: 1px solid var(--border);
        max-height: none;
    }
    .console-sidebar-header { display: none; }
    .console-nav-list {
        flex-direction: row;
        padding: 8px;
        gap: 6px;
        flex-wrap: nowrap;
    }
    .console-nav-item {
        flex-shrink: 0;
        padding: 10px 14px;
    }
    .console-nav-desc { display: none; }
    .console-content { padding: 20px; }
    
    .knowledge-container {
        grid-template-columns: 1fr;
        grid-template-rows: auto 1fr auto;
    }
    .knowledge-sidebar {
        max-height: 150px;
    }
    .knowledge-base-panel {
        max-height: 200px;
    }
    
    .community-container {
        grid-template-columns: 1fr;
        grid-template-rows: auto 1fr auto;
    }
    .community-sidebar {
        max-height: 150px;
    }
    .community-right-panel {
        max-height: 200px;
    }
}

/* ═══════════════════════════════════════════════════════════
   社区 - Community
   ═══════════════════════════════════════════════════════════ */

#community-area {
    display: none;
    height: calc(100vh - 60px - 40px);
    overflow: hidden;
    width: 100%;
}

#community-area.active {
    display: flex;
}

.community-container {
    display: grid;
    grid-template-columns: 240px 1fr 280px;
    height: 100%;
    width: 100%;
    gap: 0;
    overflow: hidden;
}

/* ── 左侧分类侧边栏 ── */
.community-sidebar {
    background: var(--bg-surface);
    border-right: 1px solid var(--border);
    padding: 16px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.topic-categories {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.category-btn {
    font-family: var(--font-body);
    font-size: 0.85rem;
    padding: 12px 14px;
    border-radius: var(--radius-md);
    border: 1px solid transparent;
    background: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    text-align: left;
    display: flex;
    align-items: center;
    gap: 10px;
    transition: all 0.2s ease;
}

.category-btn:hover {
    background: var(--bg-elevated);
    color: var(--text-primary);
}

.category-btn.active {
    background: var(--gradient-brand);
    color: #fff;
    border-color: transparent;
}

.category-btn .cat-icon {
    font-size: 1rem;
    flex-shrink: 0;
}

.category-btn .cat-count {
    margin-left: auto;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    padding: 2px 8px;
    border-radius: 10px;
    background: rgba(255,255,255,0.15);
}

.category-btn:not(.active) .cat-count {
    background: var(--bg-elevated);
    color: var(--text-muted);
}

.community-stats {
    display: flex;
    justify-content: space-around;
    padding: 16px 0;
    border-top: 1px solid var(--border);
    margin-top: auto;
}

.community-stats .stat-item {
    text-align: center;
}

.community-stats .stat-num {
    display: block;
    font-family: var(--font-display);
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--purple-bright);
}

.community-stats .stat-label {
    font-size: 0.7rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* ── 中间主内容区 ── */
.community-main {
    display: flex;
    flex-direction: column;
    background: var(--bg-deep);
    height: 100%;
    overflow: hidden;
    min-width: 0;
}

.posts-list-view {
    display: flex;
    flex-direction: column;
    height: 100%;
    overflow: hidden;
}

.posts-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 20px;
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.1), rgba(236, 72, 153, 0.05));
    border-bottom: 1px solid var(--border);
}

.posts-header h2 {
    font-size: 1.2rem;
    font-weight: 700;
    background: var(--gradient-brand);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.posts-filters {
    display: flex;
    gap: 8px;
    padding: 12px 20px;
    border-bottom: 1px solid var(--border);
    background: var(--bg-surface);
}

.sort-btn {
    font-family: var(--font-body);
    font-size: 0.8rem;
    padding: 8px 16px;
    border-radius: 16px;
    border: 1px solid var(--border);
    background: transparent;
    color: var(--text-muted);
    cursor: pointer;
    transition: all 0.2s;
}

.sort-btn:hover {
    border-color: var(--purple-primary);
    color: var(--purple-bright);
}

.sort-btn.active {
    background: var(--gradient-brand);
    border-color: transparent;
    color: #fff;
}

.posts-container {
    flex: 1;
    overflow-y: auto;
    padding: 16px 20px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

/* ── 帖子卡片 ── */
.post-card {
    background: var(--gradient-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 18px 20px;
    cursor: pointer;
    transition: all 0.25s ease;
}

.post-card:hover {
    border-color: var(--purple-primary);
    transform: translateX(4px);
    box-shadow: -4px 0 0 var(--purple-primary), 0 4px 15px rgba(139, 92, 246, 0.15);
}

.post-card-header {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    margin-bottom: 10px;
}

.post-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--gradient-brand);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 1rem;
    flex-shrink: 0;
}

.post-meta {
    flex: 1;
    min-width: 0;
}

.post-author {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-primary);
}

.post-time {
    font-size: 0.72rem;
    color: var(--text-muted);
}

.post-category-tag {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    padding: 4px 10px;
    border-radius: 10px;
    text-transform: uppercase;
    font-weight: 500;
}

.post-category-tag.question { background: rgba(59, 130, 246, 0.2); color: #60a5fa; }
.post-category-tag.discussion { background: rgba(139, 92, 246, 0.2); color: #a78bfa; }
.post-category-tag.case { background: rgba(245, 158, 11, 0.2); color: #fbbf24; }
.post-category-tag.resource { background: rgba(16, 185, 129, 0.2); color: #34d399; }

.post-title {
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
    line-height: 1.4;
}

.post-excerpt {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.6;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.post-footer {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-top: 12px;
    padding-top: 12px;
    border-top: 1px solid var(--border);
}

.post-stat {
    display: flex;
    align-items: center;
    gap: 4px;
    font-size: 0.78rem;
    color: var(--text-muted);
}

.post-stat svg {
    width: 14px;
    height: 14px;
}

.post-tags {
    display: flex;
    gap: 6px;
    margin-left: auto;
}

.post-tag {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    padding: 3px 8px;
    border-radius: 8px;
    background: var(--purple-dim);
    color: var(--purple-bright);
}

/* ── 帖子详情视图 ── */
.post-detail-view {
    display: flex;
    flex-direction: column;
    height: 100%;
    overflow: hidden;
    padding: 16px 20px;
}

.post-detail-view.hidden {
    display: none;
}

.btn-back {
    font-family: var(--font-body);
    font-size: 0.85rem;
    padding: 8px 16px;
    border: 1px solid var(--border);
    border-radius: 16px;
    background: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s;
    align-self: flex-start;
    margin-bottom: 16px;
}

.btn-back:hover {
    border-color: var(--purple-primary);
    color: var(--purple-bright);
}

.post-detail-content {
    background: var(--gradient-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 24px;
    margin-bottom: 20px;
}

.post-detail-title {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 16px;
    line-height: 1.4;
}

.post-detail-body {
    font-size: 0.95rem;
    line-height: 1.8;
    color: var(--text-secondary);
    white-space: pre-wrap;
}

.post-detail-body p {
    margin-bottom: 12px;
}

.post-actions {
    display: flex;
    gap: 12px;
    margin-top: 20px;
    padding-top: 16px;
    border-top: 1px solid var(--border);
}

.action-btn {
    font-family: var(--font-body);
    font-size: 0.82rem;
    padding: 8px 16px;
    border: 1px solid var(--border);
    border-radius: 16px;
    background: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 6px;
    transition: all 0.2s;
}

.action-btn:hover {
    border-color: var(--purple-primary);
    color: var(--purple-bright);
    background: var(--purple-dim);
}

.action-btn.liked {
    background: rgba(236, 72, 153, 0.15);
    border-color: var(--magenta);
    color: var(--magenta);
}

/* ── 回复区域 ── */
.replies-section {
    flex: 1;
    overflow-y: auto;
    min-height: 0;
}

.replies-section h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 16px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--border);
}

.replies-container {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.reply-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 16px;
}

.reply-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 10px;
}

.reply-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    font-size: 0.8rem;
    flex-shrink: 0;
}

.reply-meta {
    flex: 1;
}

.reply-author {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-primary);
}

.reply-time {
    font-size: 0.7rem;
    color: var(--text-muted);
}

.reply-content {
    font-size: 0.9rem;
    line-height: 1.7;
    color: var(--text-secondary);
}

.reply-actions {
    display: flex;
    gap: 12px;
    margin-top: 10px;
}

.reply-action {
    font-size: 0.75rem;
    color: var(--text-muted);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 4px;
    transition: color 0.2s;
}

.reply-action:hover {
    color: var(--purple-bright);
}

.reply-input-area {
    padding: 16px 0;
    border-top: 1px solid var(--border);
    margin-top: 16px;
    display: flex;
    gap: 12px;
    align-items: flex-end;
}

.reply-input-area textarea {
    flex: 1;
    font-family: var(--font-body);
    font-size: 0.9rem;
    padding: 12px 16px;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    background: var(--bg-card);
    color: var(--text-primary);
    resize: none;
    outline: none;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.reply-input-area textarea:focus {
    border-color: var(--purple-primary);
    box-shadow: 0 0 0 3px var(--purple-dim);
}

.reply-input-area textarea::placeholder {
    color: var(--text-muted);
}

/* ── 右侧面板 ── */
.community-right-panel {
    background: var(--bg-surface);
    border-left: 1px solid var(--border);
    padding: 16px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.panel-section {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.hot-topics {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.hot-topic-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 12px;
    border-radius: var(--radius-md);
    background: var(--gradient-card);
    border: 1px solid var(--border);
    cursor: pointer;
    transition: all 0.2s;
}

.hot-topic-item:hover {
    border-color: var(--purple-primary);
    transform: translateX(-3px);
}

.hot-rank {
    font-family: var(--font-display);
    font-size: 1rem;
    font-weight: 700;
    color: var(--purple-bright);
    width: 24px;
}

.hot-rank.rank-1 { color: var(--yellow); }
.hot-rank.rank-2 { color: #c0c0c0; }
.hot-rank.rank-3 { color: #cd7f32; }

.hot-topic-title {
    flex: 1;
    font-size: 0.82rem;
    color: var(--text-secondary);
    display: -webkit-box;
    -webkit-line-clamp: 1;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.hot-topic-views {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--text-muted);
}

.active-users {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.active-user-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 12px;
    border-radius: var(--radius-md);
    background: var(--gradient-card);
    border: 1px solid var(--border);
}

.active-user-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--gradient-brand);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 0.85rem;
    flex-shrink: 0;
}

.active-user-info {
    flex: 1;
    min-width: 0;
}

.active-user-name {
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--text-primary);
}

.active-user-contribution {
    font-size: 0.7rem;
    color: var(--text-muted);
}

.popular-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.popular-tag {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    padding: 6px 12px;
    border-radius: 14px;
    background: var(--purple-dim);
    color: var(--purple-bright);
    border: 1px solid var(--border);
    cursor: pointer;
    transition: all 0.2s;
}

.popular-tag:hover {
    background: var(--purple-primary);
    color: #fff;
    border-color: var(--purple-primary);
}

/* ── 弹窗 ── */
.modal {
    position: fixed;
    top: 0; right: 0; bottom: 0; left: 0;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal.hidden {
    display: none;
}

.modal-overlay {
    position: absolute;
    top: 0; right: 0; bottom: 0; left: 0;
    background: rgba(0, 0, 0, 0.7);
    -webkit-backdrop-filter: blur(4px);
    backdrop-filter: blur(4px);
}

.modal-content {
    position: relative;
    width: 90%;
    max-width: 600px;
    max-height: 90vh;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
    display: flex;
    flex-direction: column;
    animation: modalSlideIn 0.3s ease-out;
}

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: translateY(-20px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 24px;
    border-bottom: 1px solid var(--border);
}

.modal-header h2 {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-primary);
}

.modal-close {
    width: 32px;
    height: 32px;
    border: none;
    background: transparent;
    color: var(--text-muted);
    font-size: 1.5rem;
    cursor: pointer;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
}

.modal-close:hover {
    background: var(--bg-elevated);
    color: var(--text-primary);
}

.modal-body {
    padding: 24px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.form-group label {
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.form-group input,
.form-group textarea,
.form-group select {
    font-family: var(--font-body);
    font-size: 0.9rem;
    padding: 12px 16px;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    background: var(--bg-surface);
    color: var(--text-primary);
    outline: none;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    border-color: var(--purple-primary);
    box-shadow: 0 0 0 3px var(--purple-dim);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: 12px;
    padding: 16px 24px;
    border-top: 1px solid var(--border);
}

/* ── 数据模拟浮层（实战演练专用） ── */
.sim-modal-content {
    max-width: 900px;
    width: 95%;
    max-height: 92vh;
}

.sim-modal-title-row {
    display: flex;
    align-items: center;
    gap: 12px;
}

.sim-stage {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.sim-loading-spinner {
    width: 48px;
    height: 48px;
    border: 3px solid var(--border);
    border-top-color: var(--cyan);
    border-radius: 50%;
    animation: simSpin 0.8s linear infinite;
    margin: 40px auto 16px;
}

@keyframes simSpin {
    to { transform: rotate(360deg); }
}

.sim-loading-text {
    text-align: center;
    color: var(--cyan);
    font-size: 0.95rem;
}

.sim-result-summary {
    padding: 16px;
    background: var(--bg-surface);
    border-radius: var(--radius-md);
    border: 1px solid var(--border);
    font-size: 0.88rem;
    line-height: 1.7;
}

.sim-result-summary .sim-sum-title {
    color: var(--cyan);
    font-weight: 600;
    margin-bottom: 8px;
    font-size: 0.95rem;
}

.sim-preview-table-wrap {
    max-height: 260px;
    overflow: auto;
    border-radius: var(--radius-md);
    border: 1px solid var(--border);
}

.sim-preview-table-wrap .data-table {
    margin: 0;
    font-size: 0.8rem;
}

.sim-action-bar {
    display: flex;
    gap: 12px;
    justify-content: center;
    padding-top: 8px;
}

.sim-analysis-insight {
    padding: 16px;
    background: var(--bg-surface);
    border-radius: var(--radius-md);
    border-left: 3px solid var(--cyan);
    font-size: 0.92rem;
    line-height: 1.6;
}

.sim-analysis-body {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.sim-analysis-lesson {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

/* ── 空状态 ── */
.community-empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 60px 20px;
    color: var(--text-muted);
    text-align: center;
}

.community-empty-state .empty-icon {
    font-size: 4rem;
    margin-bottom: 16px;
    opacity: 0.4;
}

.community-empty-state h3 {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.community-empty-state p {
    font-size: 0.9rem;
    max-width: 300px;
}

/* ═══════════════════════════════════════════════════════════
   学习中心样式 (Learning Hub)
   ═══════════════════════════════════════════════════════════ */

/* ── 区域显示控制 ── */
#learn-area {
    display: none;
    height: calc(100vh - 60px - 40px);
    overflow: hidden;
    flex-direction: column;
}
#learn-area.active { 
    display: flex; 
}

/* ── 学习路径常驻选择栏 ── */
.learning-track-bar {
    display: flex;
    gap: 0;
    background: var(--bg-deep);
    border-bottom: 1px solid var(--border);
    flex-shrink: 0;
    justify-content: center;
}

.track-tab {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 32px;
    cursor: pointer;
    transition: all 0.25s ease;
    border-bottom: 3px solid transparent;
    position: relative;
    user-select: none;
}

.track-tab:hover {
    background: var(--bg-card);
}

.track-tab.active {
    background: var(--bg-card);
    border-bottom-color: var(--purple-primary);
}

.track-tab.active .track-tab-title {
    color: var(--purple-bright);
}

.track-tab.active .track-tab-icon {
    transform: scale(1.1);
}

/* 专业课程 tab 选中时用品红色 */
#track-tab-pro.active {
    border-bottom-color: var(--magenta);
}
#track-tab-pro.active .track-tab-title {
    color: #f472b6;
}

/* 延伸专题 tab 选中时用琥珀色 */
#track-tab-ext.active {
    border-bottom-color: #f59e0b;
}
#track-tab-ext.active .track-tab-title {
    color: #fbbf24;
}

.track-tab-icon {
    font-size: 1.5rem;
    transition: transform 0.25s ease;
}

.track-tab-title {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--text-primary);
    font-family: var(--font-body);
}

.track-tab-desc {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-family: var(--font-body);
}

/* ── learn-container 独立容器 ── */
.learn-container {
    grid-template-columns: 280px 1fr 300px;
    gap: 0;
    height: calc(100% - 52px);
    background: var(--bg-surface);
    overflow: hidden;
}
.learn-container.active-container {
    display: grid;
}
.learn-container:not(.active-container) {
    display: none !important;
}

.track-duration {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.track-arrow {
    font-size: 2rem;
    color: var(--text-muted);
    transition: transform 0.3s ease, color 0.3s ease;
}

.track-card:hover .track-arrow {
    transform: translateX(8px);
    color: var(--purple);
}

.track-card.pro:hover .track-arrow {
    color: var(--magenta);
}

/* ── 整体布局（已合并到上方 .learn-container） ── */

/* ── 侧边栏返回按钮 ── */
.sidebar-header {
    margin-bottom: 16px;
}

.btn-back {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text-secondary);
    padding: 8px 16px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.85rem;
    transition: all 0.2s ease;
    width: 100%;
}

.btn-back:hover {
    background: var(--bg-elevated);
    color: var(--text-primary);
    border-color: var(--purple);
}

/* ── 专业课程阶段选择器 ── */
.stage-tabs {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.stage-tab {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 16px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.2s ease;
    text-align: left;
}

.stage-tab:hover {
    background: var(--bg-elevated);
    border-color: var(--purple);
}

.stage-tab.active {
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.15), rgba(236, 72, 153, 0.1));
    border-color: var(--purple);
}

.stage-icon {
    font-size: 1.5rem;
}

.stage-name {
    flex: 1;
    font-weight: 600;
    color: var(--text-primary);
}

.stage-count {
    font-size: 0.75rem;
    color: var(--text-muted);
    background: var(--bg-elevated);
    padding: 2px 8px;
    border-radius: 10px;
}

/* ── 左侧边栏 ── */
.learn-sidebar {
    background: var(--bg-deep);
    border-right: 1px solid var(--border);
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 20px;
    overflow-y: auto;
}

.learner-profile {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 16px;
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.15), rgba(236, 72, 153, 0.1));
    border-radius: 16px;
    border: 1px solid var(--border);
}

.profile-avatar {
    font-size: 2.5rem;
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-card);
    border-radius: 50%;
}

.profile-info h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 4px;
}

.level-badge {
    font-size: 0.7rem;
    padding: 3px 8px;
    background: var(--gradient-brand);
    border-radius: 10px;
    color: white;
    font-weight: 500;
}

/* ── 学习进度卡片 ── */
.learn-progress-card {
    background: var(--bg-card);
    border-radius: 12px;
    padding: 16px;
    border: 1px solid var(--border);
}

.progress-header {
    display: flex;
    justify-content: space-between;
    font-size: 0.85rem;
    margin-bottom: 10px;
    color: var(--text-secondary);
}

.progress-bar-wrapper {
    height: 8px;
    background: var(--bg-elevated);
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 16px;
}

.progress-bar-fill {
    height: 100%;
    background: var(--gradient-brand);
    border-radius: 4px;
    transition: width 0.5s ease;
}

.progress-stats {
    display: flex;
    justify-content: space-around;
    text-align: center;
}

.stat-item {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.stat-value {
    font-size: 1.4rem;
    font-weight: 700;
    background: var(--gradient-brand);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    font-size: 0.7rem;
    color: var(--text-muted);
}

/* ── 周选项卡 ── */
.week-tabs {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.week-tab {
    padding: 14px 16px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 10px;
    text-align: left;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text);
    cursor: pointer;
    transition: all 0.2s;
}

.week-tab small {
    display: block;
    font-size: 0.7rem;
    color: var(--text-muted);
    font-weight: 400;
    margin-top: 2px;
}

.week-tab:hover {
    border-color: var(--purple);
    background: rgba(139, 92, 246, 0.1);
}

.week-tab.active {
    border-color: var(--purple);
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.2), rgba(236, 72, 153, 0.1));
}

.week-tab.completed {
    border-color: var(--green);
}

.week-tab.completed::after {
    content: " ✓";
    color: var(--green);
}

/* ── 成就预览 ── */
.achievement-preview {
    background: var(--bg-card);
    border-radius: 12px;
    padding: 16px;
    border: 1px solid var(--border);
}

.achievement-preview h4 {
    font-size: 0.9rem;
    margin-bottom: 12px;
}

.badge-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 8px;
    margin-bottom: 12px;
}

.badge-item {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4rem;
    background: var(--bg-elevated);
    border-radius: 8px;
    border: 1px solid var(--border);
    cursor: pointer;
    transition: all 0.2s;
}

.badge-item:hover {
    transform: scale(1.1);
}

.badge-item.locked {
    opacity: 0.3;
    filter: grayscale(1);
}

.badge-item.earned {
    border-color: var(--yellow);
    box-shadow: 0 0 10px rgba(250, 204, 21, 0.3);
}

/* ── 主内容区 ── */
.learn-main {
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.learn-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 24px 30px;
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.1), rgba(236, 72, 153, 0.05));
    border-bottom: 1px solid var(--border);
}

.today-tag {
    font-size: 0.75rem;
    color: var(--purple);
    font-weight: 500;
    margin-bottom: 6px;
    display: block;
}

.today-lesson h2 {
    font-size: 1.4rem;
    font-weight: 700;
    margin-bottom: 4px;
}

.today-lesson p {
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* ── 课程列表 ── */
.lesson-list-view {
    flex: 1;
    overflow-y: auto;
    padding: 24px 30px;
}

.lessons-container {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.lesson-card {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 16px 20px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.2s;
}

.lesson-card:hover {
    border-color: var(--purple);
    transform: translateX(4px);
}

.lesson-card.completed {
    border-color: var(--green);
    background: rgba(34, 197, 94, 0.05);
}

.lesson-card.current {
    border-color: var(--purple);
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.1), rgba(236, 72, 153, 0.05));
}

.lesson-card.locked {
    opacity: 0.55;
    cursor: not-allowed;
    position: relative;
    filter: grayscale(0.3);
}
.lesson-card.locked:hover {
    transform: none;
    box-shadow: none;
    border-color: rgba(139, 92, 246, 0.15);
}
.lesson-card.locked .lesson-day {
    background: rgba(139, 92, 246, 0.08);
}
.lesson-status.locked-badge {
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.25), rgba(236, 72, 153, 0.2));
    color: #c4b5fd;
    padding: 2px 10px;
    border-radius: 10px;
    font-size: 0.72rem;
    font-weight: 600;
}
.lesson-tag.locked-tag {
    background: rgba(139, 92, 246, 0.15) !important;
    color: #a78bfa !important;
    border: 1px solid rgba(139, 92, 246, 0.25) !important;
}

.lesson-day {
    width: 48px;
    height: 48px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: var(--bg-elevated);
    border-radius: 10px;
    font-weight: 700;
}

.lesson-day .day-num {
    font-size: 1.2rem;
    line-height: 1;
}

.lesson-day .day-label {
    font-size: 0.6rem;
    color: var(--text-muted);
}

.lesson-card.completed .lesson-day {
    background: var(--green);
    color: white;
}

.lesson-card.current .lesson-day {
    background: var(--gradient-brand);
    color: white;
}

.lesson-info {
    flex: 1;
}

.lesson-info h4 {
    font-size: 0.95rem;
    font-weight: 600;
    margin-bottom: 4px;
}

.lesson-info p {
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* ── 专业课程卡片样式 ── */
.lesson-card.pro-lesson {
    flex-direction: column;
    align-items: flex-start;
    padding: 20px;
    gap: 12px;
}

.lesson-card.pro-lesson .lesson-day {
    position: absolute;
    top: 16px;
    right: 16px;
    width: 40px;
    height: 40px;
}

.lesson-card.pro-lesson {
    position: relative;
}

.lesson-card.pro-lesson .lesson-info {
    width: 100%;
    padding-right: 50px;
}

.lesson-card.pro-lesson .lesson-info h4 {
    font-size: 1rem;
    margin-bottom: 6px;
}

.lesson-subtitle {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 10px;
}

.lesson-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.lesson-tag {
    font-size: 0.7rem;
    padding: 3px 10px;
    background: var(--bg-elevated);
    border-radius: 10px;
    color: var(--text-muted);
}

.lesson-card.pro-lesson .lesson-meta {
    width: 100%;
    justify-content: flex-start;
    padding-top: 10px;
    border-top: 1px solid var(--border);
}

.lesson-points {
    color: var(--yellow);
    font-weight: 600;
}

/* ── 专业课程内容样式 ── */
.highlight-box.pro {
    background: linear-gradient(135deg, rgba(236, 72, 153, 0.15), rgba(139, 92, 246, 0.1));
    border-left-color: var(--magenta);
}

.case-box {
    background: var(--bg-elevated);
    border-radius: 12px;
    padding: 20px;
    margin: 20px 0;
    border: 1px solid var(--border);
}

.case-box h4 {
    color: var(--cyan);
    margin-bottom: 12px;
    font-size: 0.95rem;
}

.formula-box {
    background: linear-gradient(135deg, rgba(0, 212, 255, 0.1), rgba(139, 92, 246, 0.05));
    border: 1px solid var(--cyan);
    border-radius: 12px;
    padding: 20px;
    margin: 20px 0;
    font-family: var(--font-mono);
}

.formula-box h4 {
    color: var(--cyan);
    margin-bottom: 12px;
}

.formula-box p {
    margin: 8px 0;
}

.warning-box {
    background: rgba(234, 179, 8, 0.1);
    border-left: 3px solid var(--yellow);
    padding: 16px 20px;
    border-radius: 0 12px 12px 0;
    margin: 20px 0;
}

.tip-box {
    background: rgba(34, 197, 94, 0.1);
    border-left: 3px solid var(--green);
    padding: 16px 20px;
    border-radius: 0 12px 12px 0;
    margin: 20px 0;
}

.metrics-table {
    width: 100%;
    border-collapse: collapse;
    margin: 16px 0;
}

.metrics-table th,
.metrics-table td {
    padding: 12px;
    text-align: left;
    border-bottom: 1px solid var(--border);
}

.metrics-table th {
    background: var(--bg-elevated);
    font-weight: 600;
    color: var(--text-secondary);
}

.lesson-meta {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 0.75rem;
    color: var(--text-muted);
}

.lesson-duration {
    display: flex;
    align-items: center;
    gap: 4px;
}

.lesson-status {
    padding: 4px 10px;
    border-radius: 12px;
    font-size: 0.7rem;
    font-weight: 500;
}

.lesson-status.completed {
    background: rgba(34, 197, 94, 0.2);
    color: var(--green);
}

.lesson-status.in-progress {
    background: rgba(139, 92, 246, 0.2);
    color: var(--purple);
}

/* ── 课程详情视图 ── */
.lesson-detail-view {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.lesson-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 24px;
    border-bottom: 1px solid var(--border);
    background: var(--bg-card);
}

.lesson-pagination {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.lesson-content-wrapper {
    flex: 1;
    overflow-y: auto;
    padding: 30px;
}

.lesson-content {
    max-width: 800px;
    margin: 0 auto;
}

.lesson-content h1 {
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: 24px;
    background: var(--gradient-brand);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.lesson-content h2 {
    font-size: 1.3rem;
    font-weight: 600;
    margin: 28px 0 16px;
    color: var(--text);
}

.lesson-content h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin: 20px 0 12px;
    color: var(--purple-bright);
}

.lesson-content p {
    font-size: 1rem;
    line-height: 1.8;
    color: var(--text-secondary);
    margin-bottom: 16px;
}

.lesson-content ul, .lesson-content ol {
    margin: 16px 0;
    padding-left: 24px;
}

.lesson-content li {
    font-size: 1rem;
    line-height: 1.8;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.lesson-content .highlight-box {
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.15), rgba(236, 72, 153, 0.1));
    border-left: 4px solid var(--purple);
    padding: 16px 20px;
    border-radius: 0 12px 12px 0;
    margin: 20px 0;
}

.lesson-content .example-box {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 20px;
    margin: 20px 0;
}

.lesson-content .example-box h4 {
    font-size: 0.9rem;
    color: var(--yellow);
    margin-bottom: 12px;
}

.lesson-content code {
    background: var(--bg-elevated);
    padding: 2px 8px;
    border-radius: 4px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.9em;
    color: var(--pink);
}

/* ── 课后测验 ── */
.lesson-quiz {
    max-width: 800px;
    margin: 40px auto 0;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 24px;
}

.quiz-header {
    text-align: center;
    margin-bottom: 24px;
}

.quiz-header h3 {
    font-size: 1.2rem;
    margin-bottom: 8px;
}

.quiz-header p {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.quiz-question {
    background: var(--bg-elevated);
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 16px;
}

.quiz-question h4 {
    font-size: 1rem;
    margin-bottom: 16px;
    display: flex;
    gap: 8px;
}

.quiz-question .q-num {
    color: var(--purple);
    font-weight: 700;
}

.quiz-options {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.quiz-option {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s;
}

.quiz-option:hover {
    border-color: var(--purple);
}

.quiz-option.selected {
    border-color: var(--purple);
    background: rgba(139, 92, 246, 0.1);
}

.quiz-option.correct {
    border-color: var(--green);
    background: rgba(34, 197, 94, 0.1);
}

.quiz-option.wrong {
    border-color: var(--red);
    background: rgba(239, 68, 68, 0.1);
}

.quiz-actions {
    text-align: center;
    margin-top: 24px;
}

/* ── 测验结果 ── */
.quiz-result-banner {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    padding: 16px 24px;
    border-radius: 12px;
    margin: 20px 0;
    font-size: 1.05rem;
    font-weight: 600;
}

.quiz-result-banner.pass {
    background: rgba(34, 197, 94, 0.12);
    border: 1px solid rgba(34, 197, 94, 0.3);
    color: var(--green);
}

.quiz-result-banner.fail {
    background: rgba(239, 68, 68, 0.12);
    border: 1px solid rgba(239, 68, 68, 0.3);
    color: var(--red);
}

.quiz-result-banner .result-emoji {
    font-size: 1.5rem;
}

.quiz-explanation {
    margin-top: 12px;
    padding: 14px 16px;
    background: rgba(139, 92, 246, 0.06);
    border-left: 3px solid var(--purple);
    border-radius: 0 8px 8px 0;
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.quiz-explanation strong {
    color: var(--text-primary);
}

.quiz-option.correct::after {
    content: " ✓";
    color: var(--green);
    font-weight: 700;
    margin-left: 4px;
}

.quiz-option.wrong::after {
    content: " ✗";
    color: var(--red);
    font-weight: 700;
    margin-left: 4px;
}

.quiz-option.correct,
.quiz-option.wrong {
    pointer-events: none;
}

/* ext quiz result (旧结构兼容) */
.quiz-result {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    padding: 16px 24px;
    border-radius: 12px;
    margin: 20px 0;
    font-size: 1.05rem;
    font-weight: 600;
}

.quiz-result.pass {
    background: rgba(34, 197, 94, 0.12);
    border: 1px solid rgba(34, 197, 94, 0.3);
    color: var(--green);
}

.quiz-result.fail {
    background: rgba(239, 68, 68, 0.12);
    border: 1px solid rgba(239, 68, 68, 0.3);
    color: var(--red);
}

.quiz-result .result-emoji {
    font-size: 1.5rem;
}

/* ── 测验结果浮层 ── */
.quiz-result-modal-content {
    max-width: 640px;
    width: 92%;
}

.quiz-result-modal-content .modal-body {
    max-height: 65vh;
    overflow-y: auto;
    padding: 20px 24px;
}

.quiz-modal-score {
    text-align: center;
    padding: 20px 0 16px;
}

.quiz-modal-score .score-circle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 80px;
    height: 80px;
    border-radius: 50%;
    font-size: 1.8rem;
    font-weight: 800;
    margin-bottom: 10px;
}

.quiz-modal-score .score-circle.pass {
    background: rgba(34, 197, 94, 0.12);
    color: var(--green);
    border: 3px solid rgba(34, 197, 94, 0.3);
}

.quiz-modal-score .score-circle.fail {
    background: rgba(239, 68, 68, 0.12);
    color: var(--red);
    border: 3px solid rgba(239, 68, 68, 0.3);
}

.quiz-modal-score .score-text {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-top: 4px;
}

.quiz-modal-score .score-comment {
    font-size: 1.1rem;
    font-weight: 600;
    margin-top: 6px;
}

.quiz-modal-divider {
    border: none;
    border-top: 1px solid var(--border);
    margin: 16px 0;
}

.quiz-modal-question {
    margin-bottom: 20px;
    padding: 16px;
    border-radius: 12px;
    background: var(--bg-elevated);
    border: 1px solid var(--border);
}

.quiz-modal-question .qm-title {
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--text-primary);
    margin-bottom: 10px;
    line-height: 1.5;
}

.quiz-modal-question .qm-options {
    display: flex;
    flex-direction: column;
    gap: 6px;
    margin-bottom: 12px;
}

.quiz-modal-question .qm-option {
    padding: 8px 12px;
    border-radius: 8px;
    font-size: 0.88rem;
    color: var(--text-secondary);
    background: var(--bg-card);
    border: 1px solid transparent;
}

.quiz-modal-question .qm-option.is-correct {
    background: rgba(34, 197, 94, 0.1);
    border-color: rgba(34, 197, 94, 0.3);
    color: var(--green);
    font-weight: 600;
}

.quiz-modal-question .qm-option.is-wrong {
    background: rgba(239, 68, 68, 0.08);
    border-color: rgba(239, 68, 68, 0.3);
    color: var(--red);
    text-decoration: line-through;
}

.quiz-modal-question .qm-explanation {
    padding: 10px 14px;
    background: rgba(139, 92, 246, 0.06);
    border-left: 3px solid var(--purple);
    border-radius: 0 8px 8px 0;
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.quiz-modal-question .qm-explanation strong {
    color: var(--text-primary);
}

/* ── 延伸学习区域 ── */
.related-topics-section {
    max-width: 800px;
    margin: 40px auto 0;
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.06), rgba(236, 72, 153, 0.04));
    border: 1px solid rgba(139, 92, 246, 0.2);
    border-radius: 16px;
    padding: 24px;
}

.related-topics-header {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-bottom: 20px;
    padding-bottom: 16px;
    border-bottom: 1px solid rgba(139, 92, 246, 0.15);
}

.related-topics-icon {
    font-size: 1.8rem;
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(139, 92, 246, 0.15);
    border-radius: 12px;
    flex-shrink: 0;
}

.related-topics-header h3 {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text);
    margin: 0;
}

.related-topics-header p {
    font-size: 0.82rem;
    color: var(--text-muted);
    margin: 2px 0 0;
}

/* 子标题 */
.related-sub-header {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 12px;
}

.related-sub-icon {
    font-size: 1rem;
}

.related-sub-header h4 {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text);
    margin: 0;
}

.related-hint {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-left: auto;
}

/* 延伸问题 */
.related-questions {
    margin-bottom: 20px;
}

.related-question-item {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 10px;
    margin-bottom: 8px;
    cursor: pointer;
    transition: all 0.25s ease;
    overflow: hidden;
}

.related-question-item:hover {
    border-color: rgba(139, 92, 246, 0.4);
    background: var(--bg-elevated);
}

.related-question-item .rq-main {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 16px;
}

.related-question-item .rq-num {
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(139, 92, 246, 0.15);
    color: var(--purple-bright);
    border-radius: 6px;
    font-size: 0.78rem;
    font-weight: 700;
    flex-shrink: 0;
}

.related-question-item .rq-text {
    flex: 1;
    font-size: 0.92rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

.related-question-item .rq-arrow {
    font-size: 1.2rem;
    color: var(--text-muted);
    transition: transform 0.2s;
    flex-shrink: 0;
}

.related-question-item.expanded .rq-arrow {
    transform: rotate(90deg);
    color: var(--purple-bright);
}

/* 问题展开内容 */
.rq-expand-content {
    display: none;
    padding: 4px 16px 16px 48px;
    border-top: 1px solid rgba(139, 92, 246, 0.2);
    margin-top: 0;
}

.rq-hint {
    font-size: 0.9rem;
    line-height: 1.7;
    color: var(--text-secondary);
    margin-bottom: 12px;
    padding-left: 12px;
    border-left: 2px solid var(--purple-dim);
}

.rq-jump {
    display: flex;
    align-items: center;
    gap: 8px;
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.15), rgba(236, 72, 153, 0.08));
    border: 1px solid rgba(139, 92, 246, 0.3);
    border-radius: 8px;
    padding: 10px 14px;
    cursor: pointer;
    transition: all 0.25s ease;
    font-size: 0.85rem;
    color: var(--purple-bright);
}

.rq-jump:hover {
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.25), rgba(236, 72, 153, 0.15));
    border-color: var(--purple-bright);
    transform: translateX(4px);
}

.rq-jump-icon {
    font-size: 1rem;
    flex-shrink: 0;
}

.rq-jump-arrow {
    margin-left: auto;
    font-size: 1rem;
    transition: transform 0.2s;
}

.rq-jump:hover .rq-jump-arrow {
    transform: translateX(4px);
}

.related-question-item.has-expand {
    cursor: pointer;
}

.related-question-item.has-expand:hover {
    border-color: var(--purple-primary);
}

.related-question-item.no-expand {
    cursor: default;
    opacity: 0.7;
}

.rq-expand-hint {
    font-size: 0.72rem;
    color: var(--purple-bright);
    opacity: 0.7;
    white-space: nowrap;
    margin-left: auto;
    margin-right: 4px;
    transition: opacity 0.2s;
}

.related-question-item.has-expand:hover .rq-expand-hint {
    opacity: 1;
}

.related-question-item.expanded .rq-expand-hint {
    display: none;
}

/* 关联课程卡片 */
.related-lessons {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.related-lesson-card {
    display: flex;
    align-items: center;
    gap: 12px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 14px 16px;
    cursor: pointer;
    transition: all 0.25s ease;
}

.related-lesson-card:hover {
    border-color: rgba(139, 92, 246, 0.4);
    background: var(--bg-elevated);
    transform: translateX(4px);
}

.related-lesson-card .rl-badge {
    padding: 3px 10px;
    border-radius: 6px;
    font-size: 0.72rem;
    font-weight: 600;
    background: rgba(139, 92, 246, 0.15);
    color: var(--purple-bright);
    white-space: nowrap;
    flex-shrink: 0;
}

.related-lesson-card .rl-info {
    flex: 1;
    min-width: 0;
}

.related-lesson-card .rl-title {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.related-lesson-card .rl-reason {
    font-size: 0.78rem;
    color: var(--text-muted);
    margin-top: 2px;
}

.related-lesson-card .rl-arrow {
    color: var(--purple-bright);
    font-size: 1.1rem;
    flex-shrink: 0;
    opacity: 0;
    transition: opacity 0.2s;
}

.related-lesson-card:hover .rl-arrow {
    opacity: 1;
}

/* ── 完成提示 ── */
.lesson-complete {
    max-width: 500px;
    margin: 40px auto;
    text-align: center;
    padding: 40px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 20px;
}

.complete-icon {
    font-size: 4rem;
    margin-bottom: 16px;
}

.lesson-complete h3 {
    font-size: 1.4rem;
    margin-bottom: 20px;
}

.complete-rewards {
    display: flex;
    justify-content: center;
    gap: 16px;
    margin-bottom: 28px;
}

.reward-item {
    padding: 8px 16px;
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.2), rgba(236, 72, 153, 0.1));
    border-radius: 20px;
    font-size: 0.9rem;
    color: var(--purple-bright);
    font-weight: 500;
}

.complete-actions {
    display: flex;
    justify-content: center;
    gap: 12px;
}

/* ── 右侧工具栏 ── */
.learn-tools {
    background: var(--bg-deep);
    border-left: 1px solid var(--border);
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 20px;
    overflow-y: auto;
}

/* 右侧学员信息卡片 */
.learn-tools > .learner-profile {
    flex-shrink: 0;
}

.tool-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 16px;
}

.tool-card h4 {
    font-size: 0.9rem;
    margin-bottom: 14px;
    font-weight: 600;
}

/* ── 今日目标 ── */
.daily-goals {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.goal-item {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.85rem;
    cursor: pointer;
}

.goal-item input[type="checkbox"] {
    width: 18px;
    height: 18px;
    accent-color: var(--purple);
}

.goal-item span {
    transition: all 0.2s;
}

.goal-item input:checked + span {
    text-decoration: line-through;
    color: var(--text-muted);
}

/* ── 知识卡片翻转效果 ── */
.knowledge-card {
    perspective: 1000px;
}

.knowledge-flip-card {
    width: 100%;
    height: 140px;
    cursor: pointer;
    margin-bottom: 12px;
}

.flip-card-inner {
    position: relative;
    width: 100%;
    height: 100%;
    transition: transform 0.6s;
    transform-style: preserve-3d;
}

.knowledge-flip-card.flipped .flip-card-inner {
    transform: rotateY(180deg);
}

.flip-card-front, .flip-card-back {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    border-radius: 10px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 16px;
    text-align: center;
}

.flip-card-front {
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.2), rgba(236, 72, 153, 0.1));
    border: 1px solid var(--purple);
}

.flip-card-front small {
    font-size: 0.7rem;
    color: var(--text-muted);
    margin-top: 12px;
}

.card-question {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text);
}

.flip-card-back {
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    transform: rotateY(180deg);
}

.card-answer {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ── 快捷工具 ── */
.quick-tools {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
}

.tool-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    padding: 12px 8px;
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: 10px;
    font-size: 0.75rem;
    color: var(--text);
    cursor: pointer;
    transition: all 0.2s;
}

.tool-btn span {
    font-size: 1.3rem;
}

.tool-btn:hover {
    border-color: var(--purple);
    background: rgba(139, 92, 246, 0.1);
}

/* ── 排行榜 ── */
.leaderboard {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.leader-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 12px;
    background: var(--bg-elevated);
    border-radius: 8px;
    font-size: 0.85rem;
}

.leader-item .rank {
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    font-size: 0.75rem;
    font-weight: 700;
}

.rank.gold {
    background: linear-gradient(135deg, #fbbf24, #f59e0b);
    color: #1a1a2e;
}

.rank.silver {
    background: linear-gradient(135deg, #9ca3af, #6b7280);
    color: #1a1a2e;
}

.rank.bronze {
    background: linear-gradient(135deg, #d97706, #b45309);
    color: #1a1a2e;
}

.leader-item .name {
    flex: 1;
}

.leader-item .score {
    color: var(--purple-bright);
    font-weight: 600;
}

/* ── 成就弹窗 ── */
.achievement-modal-content {
    max-width: 700px;
}

.achievement-tabs {
    display: flex;
    gap: 8px;
    margin-bottom: 20px;
}

.ach-tab {
    padding: 8px 16px;
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: 20px;
    font-size: 0.85rem;
    color: var(--text);
    cursor: pointer;
    transition: all 0.2s;
}

.ach-tab:hover, .ach-tab.active {
    border-color: var(--purple);
    background: rgba(139, 92, 246, 0.1);
}

.achievements-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: 16px;
}

.achievement-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 20px 12px;
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: 12px;
    text-align: center;
    transition: all 0.2s;
}

.achievement-item:hover {
    transform: translateY(-4px);
}

.achievement-item.earned {
    border-color: var(--yellow);
    background: rgba(250, 204, 21, 0.05);
}

.achievement-item.locked {
    opacity: 0.4;
}

.achievement-icon {
    font-size: 2.5rem;
    margin-bottom: 10px;
}

.achievement-item.locked .achievement-icon {
    filter: grayscale(1);
}

.achievement-name {
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 4px;
}

.achievement-desc {
    font-size: 0.7rem;
    color: var(--text-muted);
}

/* ── 响应式适配 ── */
@media (max-width: 1200px) {
    .learn-container {
        grid-template-columns: 240px 1fr 260px;
    }
    #ext-container.active-container {
        grid-template-columns: 240px 1fr;
    }
}

/* ═══ 延伸专题分类导航 ═══ */

.ext-category-nav-section {
    background: rgba(245, 158, 11, 0.05) !important;
    border-color: rgba(245, 158, 11, 0.15) !important;
}

.ext-category-nav-section h4 {
    color: #fbbf24 !important;
}

#ext-category-nav {
    display: flex;
    flex-direction: column;
    gap: 4px;
    margin-top: 8px;
}

.ext-cat-item {
    display: flex;
    flex-direction: column;
    gap: 4px;
    padding: 8px 10px;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s ease;
    border: 1px solid transparent;
}

.ext-cat-item:hover {
    background: rgba(245, 158, 11, 0.08);
}

.ext-cat-item.active {
    background: rgba(245, 158, 11, 0.12);
    border-color: rgba(245, 158, 11, 0.3);
}

.ext-cat-item-left {
    display: flex;
    align-items: center;
    gap: 8px;
}

.ext-cat-icon {
    font-size: 1rem;
    flex-shrink: 0;
    width: 20px;
    text-align: center;
}

.ext-cat-text {
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.ext-cat-name {
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.ext-cat-count {
    font-size: 0.7rem;
    color: var(--text-muted);
}

.ext-cat-progress {
    height: 3px;
    background: rgba(245, 158, 11, 0.1);
    border-radius: 2px;
    overflow: hidden;
}

.ext-cat-progress-fill {
    height: 100%;
    background: linear-gradient(90deg, #f59e0b, #fbbf24);
    border-radius: 2px;
    transition: width 0.3s ease;
}

/* 学习地图分组 */
.ext-map-group {
    margin-bottom: 10px;
    transition: opacity 0.3s ease;
}

.ext-map-group.faded {
    opacity: 0.3;
}

.ext-map-group-label {
    font-size: 0.7rem;
    color: var(--text-muted);
    margin-bottom: 4px;
    padding-left: 2px;
    font-weight: 600;
}

/* 筛选栏分类按钮 */
.ext-filter-bar {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-bottom: 20px;
}

.ext-filter-cats {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
}

.ext-cat-btn {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 6px 12px;
    border-radius: 20px;
    border: 1px solid var(--border);
    background: var(--bg-card);
    color: var(--text-secondary);
    font-size: 0.78rem;
    cursor: pointer;
    transition: all 0.2s ease;
    white-space: nowrap;
}

.ext-cat-btn:hover {
    border-color: #f59e0b;
    color: #fbbf24;
}

.ext-cat-btn.active {
    background: rgba(245, 158, 11, 0.15);
    border-color: #f59e0b;
    color: #fbbf24;
    font-weight: 600;
}

.ext-cat-btn-count {
    font-size: 0.68rem;
    background: rgba(245, 158, 11, 0.15);
    color: #f59e0b;
    padding: 1px 5px;
    border-radius: 8px;
    font-weight: 600;
}

.ext-cat-btn.active .ext-cat-btn-count {
    background: rgba(245, 158, 11, 0.25);
}

/* 卡片分类标签 */
.ext-card-cat-badge {
    font-size: 0.68rem;
    padding: 2px 8px;
    border-radius: 10px;
    background: rgba(139, 92, 246, 0.1);
    color: #a78bfa;
    border: 1px solid rgba(139, 92, 246, 0.2);
    white-space: nowrap;
}

/* ═══ 延伸专题样式 ═══ */

#ext-container {
    display: none;
}

#ext-container.active-container {
    display: grid;
    grid-template-columns: 280px 1fr;
}

.ext-sidebar {
    min-width: 0;
}

.ext-map-node {
    width: 38px;
    font-size: 0.6rem;
}

.ext-sidebar .learn-progress-card {
    background: linear-gradient(135deg, rgba(245, 158, 11, 0.12), rgba(251, 191, 36, 0.06));
    border: 1px solid rgba(245, 158, 11, 0.2);
}

.ext-progress-fill {
    background: linear-gradient(90deg, #f59e0b, #fbbf24) !important;
}

.ext-main {
    padding: 24px 20px;
    overflow-y: auto;
}

.ext-header {
    margin-bottom: 24px;
}

.ext-header h2 {
    font-size: 1.5rem;
    margin-bottom: 6px;
}

.ext-header p {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.ext-filter-search-wrap {
    flex: 1;
    min-width: 0;
}

.ext-filter-search {
    width: 100%;
    padding: 8px 14px;
    border-radius: 10px;
    border: 1px solid var(--border);
    background: var(--bg-card);
    color: var(--text-primary);
    font-size: 0.85rem;
    outline: none;
    transition: border-color 0.2s;
}

.ext-filter-search::placeholder {
    color: var(--text-muted);
}

.ext-filter-search:focus {
    border-color: #f59e0b;
}

.ext-cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 16px;
}

.ext-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 20px;
    cursor: pointer;
    transition: all 0.25s ease;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.ext-card:hover {
    border-color: #f59e0b;
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(245, 158, 11, 0.12);
}

.ext-card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.ext-card-icon {
    font-size: 1.5rem;
}

.ext-card-duration {
    font-size: 0.78rem;
    color: var(--text-muted);
    background: var(--bg-elevated);
    padding: 3px 8px;
    border-radius: 10px;
}

.ext-card-title {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.4;
    margin: 0;
}

.ext-card-yid {
    display: inline-block;
    background: rgba(245, 158, 11, 0.18);
    color: #fbbf24;
    font-size: 0.72rem;
    font-weight: 700;
    padding: 1px 6px;
    border-radius: 5px;
    margin-right: 6px;
    vertical-align: middle;
    letter-spacing: 0.5px;
}

.ext-card-subtitle {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.5;
    margin: 0;
}

.ext-card-tags {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
}

.ext-tag {
    font-size: 0.72rem;
    padding: 2px 8px;
    border-radius: 10px;
    background: rgba(245, 158, 11, 0.1);
    color: #fbbf24;
    border: 1px solid rgba(245, 158, 11, 0.2);
}

.ext-card-source {
    font-size: 0.78rem;
    color: var(--text-muted);
    padding-top: 8px;
    border-top: 1px solid var(--border);
    margin-top: auto;
}

/* 延伸专题详情视图 */
#ext-detail-view {
    display: none;
    flex-direction: column;
    overflow: hidden;
    height: 100%;
}

#ext-detail-view .lesson-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 0;
    border-bottom: 1px solid var(--border);
    flex-shrink: 0;
}

.ext-source-badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    font-size: 0.78rem;
    color: #fbbf24;
    background: rgba(245, 158, 11, 0.1);
    border: 1px solid rgba(245, 158, 11, 0.25);
    padding: 4px 10px;
    border-radius: 12px;
}

#ext-detail-view .lesson-content-wrapper {
    flex: 1;
    overflow-y: auto;
    padding-bottom: 40px;
}

.ext-empty {
    text-align: center;
    padding: 80px 20px;
    color: var(--text-muted);
}

.ext-empty p:first-child {
    font-size: 1.3rem;
    margin-bottom: 8px;
}

@media (max-width: 992px) {
    .learn-container {
        grid-template-columns: 1fr;
    }
    
    .learn-sidebar, .learn-tools {
        display: none;
    }
}

/* ═══ 学习地图 ═══ */
.learning-map-section {
    background: rgba(139, 92, 246, 0.05);
    border: 1px solid rgba(139, 92, 246, 0.15);
    border-radius: 12px;
    padding: 16px;
    margin-top: 12px;
}

.learning-map-section h4 {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 12px;
}

.learning-map {
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.map-stage {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.map-stage-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.map-stage-count {
    font-size: 0.75rem;
    color: var(--text-muted);
    background: rgba(255,255,255,0.05);
    padding: 2px 8px;
    border-radius: 10px;
}

.map-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 5px;
}

.map-node {
    width: 30px;
    height: 30px;
    border-radius: 7px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.65rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--text-muted);
}

.map-node:hover {
    transform: scale(1.15);
    border-color: rgba(139, 92, 246, 0.5);
    background: rgba(139, 92, 246, 0.15);
}

.map-node.done {
    background: linear-gradient(135deg, rgba(34, 197, 94, 0.2), rgba(16, 185, 129, 0.15));
    border-color: rgba(34, 197, 94, 0.4);
    color: #22c55e;
    font-size: 0.7rem;
}

.map-node.done:hover {
    background: linear-gradient(135deg, rgba(34, 197, 94, 0.3), rgba(16, 185, 129, 0.25));
    border-color: rgba(34, 197, 94, 0.6);
}

/* ═══ 标记完成按钮 ═══ */
.mark-complete-bar {
    display: flex;
    justify-content: center;
    padding: 24px 0 8px;
    margin-top: 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.06);
}

.btn-mark-complete {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 32px;
    border-radius: 12px;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    border: 2px solid rgba(139, 92, 246, 0.4);
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.1), rgba(236, 72, 153, 0.08));
    color: #c4b5fd;
}

.btn-mark-complete:hover:not(:disabled) {
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.25), rgba(236, 72, 153, 0.18));
    border-color: rgba(139, 92, 246, 0.7);
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(139, 92, 246, 0.2);
}

.btn-mark-complete:active:not(:disabled) {
    transform: translateY(0);
}

.btn-mark-complete.completed {
    background: linear-gradient(135deg, rgba(34, 197, 94, 0.15), rgba(16, 185, 129, 0.1));
    border-color: rgba(34, 197, 94, 0.4);
    color: #4ade80;
    cursor: default;
}

.btn-mark-complete:disabled {
    opacity: 0.9;
}

/* ═══ 过滤按钮 ═══ */
.btn-filter-toggle {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    border-radius: 10px;
    font-size: 0.82rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.25s ease;
    border: 1px solid rgba(255, 255, 255, 0.12);
    background: rgba(255, 255, 255, 0.04);
    color: var(--text-muted);
}

.btn-filter-toggle:hover {
    background: rgba(139, 92, 246, 0.1);
    border-color: rgba(139, 92, 246, 0.3);
    color: var(--text-secondary);
}

.btn-filter-toggle.active {
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.2), rgba(236, 72, 153, 0.15));
    border-color: rgba(139, 92, 246, 0.5);
    color: #c4b5fd;
    box-shadow: 0 0 12px rgba(139, 92, 246, 0.15);
}

/* ═══ 过滤空状态提示 ═══ */
.filter-empty-hint {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 48px 20px;
    text-align: center;
    color: var(--text-muted);
}

.filter-empty-hint span {
    font-size: 2.5rem;
    margin-bottom: 12px;
}

.filter-empty-hint p {
    font-size: 0.95rem;
    color: var(--text-secondary);
}

/* ═══ 延伸专题完成状态 ═══ */
.ext-card-done {
    border-color: rgba(34, 197, 94, 0.3) !important;
    position: relative;
}

.ext-card-done::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(34, 197, 94, 0.05), transparent);
    border-radius: inherit;
    pointer-events: none;
}

.ext-done-badge {
    font-size: 0.85rem;
    margin-left: auto;
    margin-right: 4px;
}

/* ═══ 面试刷题 tab 选中色（青蓝色系） ═══ */
#track-tab-interview.active {
    border-bottom-color: #06b6d4;
}
#track-tab-interview.active .track-tab-title {
    color: #22d3ee;
}

/* ═══ 面试刷题容器 ═══ */
#interview-container {
    display: none;
}

#interview-container.active-container {
    display: grid;
    grid-template-columns: 280px 1fr;
}

/* ── 面试刷题侧边栏 ── */
.interview-sidebar {
    min-width: 0;
}

.interview-progress-card {
    background: linear-gradient(135deg, rgba(6, 182, 212, 0.12), rgba(34, 211, 238, 0.06)) !important;
    border: 1px solid rgba(6, 182, 212, 0.2) !important;
}

.iv-progress-fill {
    background: linear-gradient(90deg, #06b6d4, #22d3ee) !important;
}

.iv-category-filter,
.iv-difficulty-filter {
    background: var(--bg-card);
    border-radius: 12px;
    padding: 16px;
    border: 1px solid var(--border);
}

.iv-category-filter h4,
.iv-difficulty-filter h4 {
    font-size: 0.9rem;
    margin-bottom: 12px;
}

.iv-categories {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.iv-cat-btn {
    font-family: var(--font-body);
    font-size: 0.82rem;
    padding: 10px 14px;
    border-radius: 10px;
    border: 1px solid var(--border);
    background: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    text-align: left;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    transition: all 0.2s ease;
}

.iv-cat-btn:hover {
    background: var(--bg-elevated);
    border-color: #06b6d4;
    color: var(--text-primary);
}

.iv-cat-btn.active {
    background: rgba(6, 182, 212, 0.12);
    border-color: #06b6d4;
    color: #22d3ee;
}

.iv-cat-count {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    padding: 2px 8px;
    border-radius: 10px;
    background: var(--bg-elevated);
    color: var(--text-muted);
}

.iv-cat-btn.active .iv-cat-count {
    background: rgba(6, 182, 212, 0.2);
    color: #22d3ee;
}

.iv-diff-btns {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
}

.iv-diff-btn {
    font-family: var(--font-body);
    font-size: 0.78rem;
    padding: 6px 14px;
    border-radius: 16px;
    border: 1px solid var(--border);
    background: transparent;
    color: var(--text-muted);
    cursor: pointer;
    transition: all 0.2s;
}

.iv-diff-btn:hover {
    border-color: #06b6d4;
    color: #22d3ee;
}

.iv-diff-btn.active {
    background: linear-gradient(135deg, #06b6d4, #0891b2);
    border-color: transparent;
    color: #fff;
}

/* ── 面试刷题主内容 ── */
.iv-main {
    padding: 24px 20px;
    overflow-y: auto;
}

.iv-header {
    margin-bottom: 24px;
}

.iv-header h2 {
    font-size: 1.5rem;
    margin-bottom: 6px;
}

.iv-header p {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.iv-toolbar {
    display: flex;
    gap: 12px;
    margin-bottom: 20px;
    align-items: center;
}

.iv-search-wrap {
    flex: 1;
    min-width: 0;
}

.iv-search-input {
    width: 100%;
    padding: 8px 14px;
    border-radius: 10px;
    border: 1px solid var(--border);
    background: var(--bg-card);
    color: var(--text-primary);
    font-size: 0.85rem;
    font-family: var(--font-body);
    outline: none;
    transition: border-color 0.2s;
}

.iv-search-input::placeholder {
    color: var(--text-muted);
}

.iv-search-input:focus {
    border-color: #06b6d4;
}

.iv-mode-toggle {
    display: flex;
    gap: 4px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 3px;
    flex-shrink: 0;
}

.iv-mode-btn {
    font-family: var(--font-body);
    font-size: 0.78rem;
    padding: 6px 14px;
    border: none;
    border-radius: 8px;
    background: transparent;
    color: var(--text-muted);
    cursor: pointer;
    transition: all 0.2s;
}

.iv-mode-btn.active {
    background: linear-gradient(135deg, #06b6d4, #0891b2);
    color: #fff;
}

.iv-mode-btn:hover:not(.active) {
    color: var(--text-primary);
}

/* ── 题目卡片网格 ── */
.iv-cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 14px;
}

.iv-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 18px;
    cursor: pointer;
    transition: all 0.25s ease;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.iv-card:hover {
    border-color: #06b6d4;
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(6, 182, 212, 0.12);
}

.iv-card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.iv-card-num {
    display: inline-block;
    background: rgba(6, 182, 212, 0.18);
    color: #22d3ee;
    font-size: 0.72rem;
    font-weight: 700;
    padding: 2px 8px;
    border-radius: 5px;
    letter-spacing: 0.5px;
}

.iv-card-diff {
    font-size: 0.7rem;
    padding: 2px 8px;
    border-radius: 10px;
    font-weight: 500;
}

.iv-card-diff.easy {
    background: rgba(16, 185, 129, 0.15);
    color: #34d399;
}

.iv-card-diff.medium {
    background: rgba(245, 158, 11, 0.15);
    color: #fbbf24;
}

.iv-card-diff.hard {
    background: rgba(236, 72, 153, 0.15);
    color: #f472b6;
}

.iv-card-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    line-height: 1.4;
}

.iv-card-category {
    font-size: 0.78rem;
    color: var(--text-muted);
}

.iv-card-tags {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
}

.iv-tag {
    font-size: 0.7rem;
    padding: 2px 8px;
    border-radius: 10px;
    background: rgba(6, 182, 212, 0.1);
    color: #22d3ee;
    border: 1px solid rgba(6, 182, 212, 0.2);
}

.iv-card-footer {
    display: flex;
    align-items: center;
    gap: 8px;
    padding-top: 8px;
    border-top: 1px solid var(--border);
    margin-top: auto;
}

.iv-card-status {
    font-size: 0.72rem;
    color: var(--text-muted);
}

.iv-card-status.done {
    color: #22c55e;
}

/* ── 题目详情视图 ── */
.iv-question-content {
    max-width: 800px;
    margin: 0 auto;
}

.iv-q-header {
    margin-bottom: 24px;
}

.iv-q-header h1 {
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 12px;
}

.iv-q-meta {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
}

.iv-q-scenario {
    background: var(--bg-card);
    border-left: 3px solid #06b6d4;
    border-radius: 0 12px 12px 0;
    padding: 16px 20px;
    margin: 20px 0;
    font-size: 0.95rem;
    line-height: 1.8;
    color: var(--text-secondary);
}

.iv-q-question {
    font-size: 1.1rem;
    font-weight: 600;
    color: #22d3ee;
    margin: 20px 0;
    line-height: 1.5;
}

.iv-q-options {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin: 20px 0;
}

.iv-q-option {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 18px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.2s;
    font-size: 0.95rem;
    color: var(--text-secondary);
}

.iv-q-option:hover {
    border-color: #06b6d4;
    background: rgba(6, 182, 212, 0.05);
}

.iv-q-option.selected {
    border-color: #06b6d4;
    background: rgba(6, 182, 212, 0.1);
    color: var(--text-primary);
}

.iv-q-option.correct {
    border-color: var(--green);
    background: rgba(34, 197, 94, 0.1);
}

.iv-q-option.wrong {
    border-color: #ef4444;
    background: rgba(239, 68, 68, 0.1);
}

.iv-q-option-label {
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: var(--bg-elevated);
    font-weight: 700;
    font-size: 0.82rem;
    flex-shrink: 0;
}

.iv-q-option.selected .iv-q-option-label {
    background: #06b6d4;
    color: #fff;
}

.iv-q-actions {
    display: flex;
    gap: 12px;
    margin: 24px 0;
}

.iv-answer-section {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 24px;
    margin: 24px 0;
    display: none;
}

.iv-answer-section.visible {
    display: block;
    animation: fadeInUp 0.3s ease-out;
}

.iv-answer-section h3 {
    font-size: 1.1rem;
    font-weight: 700;
    color: #22d3ee;
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.iv-answer-body {
    font-size: 0.95rem;
    line-height: 1.8;
    color: var(--text-secondary);
}

.iv-answer-body p {
    margin-bottom: 12px;
}

.iv-answer-body .iv-key-point {
    background: rgba(6, 182, 212, 0.08);
    border-left: 3px solid #06b6d4;
    padding: 12px 16px;
    border-radius: 0 8px 8px 0;
    margin: 12px 0;
}

.iv-answer-body ul {
    padding-left: 20px;
    margin: 8px 0;
}

.iv-answer-body li {
    margin-bottom: 6px;
    line-height: 1.7;
}

.iv-detail-nav {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.iv-card-done {
    border-color: rgba(34, 197, 94, 0.3) !important;
    position: relative;
}

.iv-card-done::after {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background: linear-gradient(135deg, rgba(34, 197, 94, 0.05), transparent);
    border-radius: inherit;
    pointer-events: none;
}

/* ── 面试刷题响应式 ── */
@media (max-width: 1200px) {
    #interview-container.active-container {
        grid-template-columns: 240px 1fr;
    }
}

@media (max-width: 992px) {
    #interview-container.active-container {
        grid-template-columns: 1fr;
    }
    .interview-sidebar {
        display: none;
    }
}

/* ═══════════════════════════════════════════════════════════
   实战演练容器（学习中心内）
   ═══════════════════════════════════════════════════════════ */

#challenge-container {
    display: none;
    grid-template-columns: 280px 1fr;
    gap: 0;
    height: calc(100vh - 60px - 56px);
}
#challenge-container.active-container {
    display: grid;
}

/* 左侧边栏 */
.challenge-sidebar-new {
    background: var(--bg-surface);
    border-right: 1px solid var(--border);
    padding: 16px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.ch-difficulty-filter h4,
.ch-challenge-list-section h4 {
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.ch-challenge-list-section {
    flex: 1;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
}

.ch-progress-fill {
    background: linear-gradient(90deg, #10b981, #06b6d4) !important;
}

/* 右侧主内容 */
.ch-main {
    padding: 24px 28px;
    overflow-y: auto;
}

.ch-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 24px;
}

.ch-header h2 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 4px;
}

.ch-header p {
    color: var(--text-muted);
    font-size: 0.88rem;
}

/* 模拟器数据预览（工具箱内） */
.simulator-preview-section {
    margin-top: 20px;
    padding-top: 16px;
    border-top: 1px solid var(--border);
}

.simulator-preview-section .data-table-wrap {
    border-radius: var(--radius-md);
    border: 1px solid var(--border);
    background: var(--bg-surface);
}

.simulator-preview-section .data-stats {
    margin-top: 12px;
}

/* ═══════════════════════════════════════════════════════════
   一键分析结果区
   ═══════════════════════════════════════════════════════════ */

.analysis-result-section {
    margin-top: 24px;
    padding-top: 20px;
    border-top: 2px solid var(--purple-dim);
}

.analysis-loading {
    color: var(--cyan);
    animation: pulse 1.2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.4; }
}

/* 洞察框 */
.insight-box {
    padding: 16px 20px;
    border-radius: var(--radius-md);
    font-size: 0.95rem;
    line-height: 1.6;
    margin-bottom: 20px;
}
.insight-warn {
    background: linear-gradient(135deg, rgba(245, 158, 11, 0.12), rgba(236, 72, 153, 0.08));
    border-left: 4px solid var(--yellow);
    color: var(--yellow);
}
.insight-ok {
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.12), rgba(6, 182, 212, 0.08));
    border-left: 4px solid var(--green);
    color: var(--green);
}

/* 分析卡片 */
.analysis-card {
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 20px;
    margin-bottom: 16px;
}
.analysis-card h4 {
    font-size: 0.9rem;
    color: var(--text-primary);
    margin-bottom: 16px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--border);
}
.analysis-card-sm { padding: 14px 18px; }

/* 分析表格增强 */
.analysis-table {
    width: 100%;
    font-size: 0.82rem;
}
.analysis-table th {
    background: var(--bg-elevated);
    color: var(--text-secondary);
    font-weight: 600;
    text-align: center;
    white-space: nowrap;
}
.analysis-table td { text-align: center; }
.row-highlight { background: rgba(139, 92, 246, 0.08); }
.row-danger { background: rgba(239, 68, 68, 0.08); }
.row-success { background: rgba(16, 185, 129, 0.08); }

.winner-badge {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 10px;
    font-size: 0.75rem;
    font-weight: 600;
    background: var(--cyan-dim);
    color: var(--cyan);
}
.winner-reversed {
    background: rgba(245, 158, 11, 0.15);
    color: var(--yellow);
}

.table-note {
    font-size: 0.78rem;
    color: var(--text-dim);
    margin-top: 10px;
    font-style: italic;
}

/* 指标网格 */
.analysis-metrics {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
    gap: 12px;
}
.metric-item {
    background: var(--bg-elevated);
    border-radius: var(--radius-sm);
    padding: 14px;
    text-align: center;
}
.metric-value {
    font-size: 1.4rem;
    font-weight: 700;
    font-family: var(--font-mono);
    color: var(--text-primary);
}
.metric-label {
    font-size: 0.75rem;
    color: var(--text-dim);
    margin-top: 4px;
}
.val-cyan { color: var(--cyan); }
.val-magenta { color: var(--magenta); }
.val-green { color: var(--green); }
.val-yellow { color: var(--yellow); }
.val-red { color: #ef4444; }
.val-blue { color: var(--blue); }

/* 置信区间可视化 */
.ci-visual {
    margin-top: 14px;
    padding: 12px 16px;
    background: var(--bg-elevated);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}
.ci-label { font-size: 0.82rem; color: var(--text-secondary); }
.ci-range {
    font-family: var(--font-mono);
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--text-primary);
}
.ci-note {
    font-size: 0.78rem;
    padding: 2px 10px;
    border-radius: 10px;
}
.ci-positive { background: rgba(16, 185, 129, 0.15); color: var(--green); }
.ci-negative { background: rgba(239, 68, 68, 0.15); color: #ef4444; }
.ci-neutral { background: rgba(245, 158, 11, 0.15); color: var(--yellow); }

/* 组成比例条 */
.composition-bars { display: flex; flex-direction: column; gap: 16px; }
.comp-row { display: flex; flex-direction: column; gap: 6px; }
.comp-label { font-size: 0.82rem; font-weight: 600; color: var(--text-secondary); }
.comp-bar {
    display: flex;
    height: 32px;
    border-radius: 6px;
    overflow: hidden;
}
.comp-segment {
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    font-weight: 600;
    color: #fff;
    min-width: 30px;
}
.comp-color-0 { background: var(--cyan); }
.comp-color-1 { background: var(--purple-primary); }
.comp-color-2 { background: var(--magenta); }
.comp-legend { display: flex; gap: 14px; flex-wrap: wrap; }
.comp-legend-item { font-size: 0.75rem; color: var(--text-dim); display: flex; align-items: center; gap: 4px; }
.comp-dot { width: 8px; height: 8px; border-radius: 50%; display: inline-block; }

/* 趋势图 */
.trend-chart {
    display: flex;
    align-items: flex-end;
    gap: 3px;
    height: 140px;
    padding: 10px 0;
    border-bottom: 1px solid var(--border);
}
.trend-bar-wrap {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    height: 100%;
    justify-content: flex-end;
}
.trend-bar {
    width: 100%;
    min-height: 2px;
    border-radius: 3px 3px 0 0;
    transition: height 0.5s ease;
}
.trend-label {
    font-size: 0.65rem;
    color: var(--text-dim);
    margin-top: 4px;
}
.trend-legend {
    display: flex;
    gap: 16px;
    margin-top: 10px;
    font-size: 0.78rem;
    color: var(--text-dim);
}
.trend-legend .dot {
    display: inline-block;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    margin-right: 4px;
}

/* 比例条 (SRM) */
.ratio-visual { margin-bottom: 4px; }
.ratio-bar-container {
    display: flex;
    height: 40px;
    border-radius: 8px;
    overflow: hidden;
    margin-bottom: 6px;
}
.ratio-bar {
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.82rem;
    font-weight: 600;
    color: #fff;
}
.ratio-a { background: var(--cyan); }
.ratio-b { background: var(--magenta); }
.ratio-expected { font-size: 0.75rem; color: var(--text-dim); text-align: center; }

/* 前置检查项 */
.check-items { display: flex; flex-direction: column; gap: 8px; }
.check-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 12px;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
}
.check-pass { background: rgba(16, 185, 129, 0.08); color: var(--green); }
.check-fail { background: rgba(239, 68, 68, 0.08); color: #ef4444; }
.check-warn { background: rgba(245, 158, 11, 0.08); color: var(--yellow); }

/* 决策卡片 */
.decision-card { border-color: var(--purple-primary); }
.decision-result {
    display: flex;
    align-items: center;
    gap: 14px;
}
.decision-icon { font-size: 2rem; }
.decision-text {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-primary);
}
.decision-reason {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-top: 4px;
}

/* 多变体柱状图 */
.variant-bars { display: flex; flex-direction: column; gap: 10px; }
.var-bar-row { display: flex; align-items: center; gap: 10px; }
.var-name { width: 100px; font-size: 0.8rem; color: var(--text-secondary); text-align: right; flex-shrink: 0; }
.var-bar-bg {
    flex: 1;
    height: 24px;
    background: var(--bg-elevated);
    border-radius: 4px;
    overflow: hidden;
}
.var-bar { height: 100%; border-radius: 4px; transition: width 0.6s ease; min-width: 2px; }
.var-bar-ctrl { background: var(--cyan); }
.var-bar-v0 { background: var(--purple-primary); }
.var-bar-v1 { background: var(--magenta); }
.var-bar-v2 { background: var(--yellow); }
.var-rate { width: 60px; font-size: 0.8rem; font-family: var(--font-mono); color: var(--text-primary); }

/* 标签 */
.tag-sig {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 10px;
    font-size: 0.72rem;
    font-weight: 600;
    background: rgba(16, 185, 129, 0.15);
    color: var(--green);
}
.tag-nonsig {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 10px;
    font-size: 0.72rem;
    color: var(--text-dim);
    background: var(--bg-elevated);
}

/* 启示卡片 */
.lesson-card {
    border-radius: var(--radius-md);
    padding: 20px;
    margin-top: 16px;
}
.lesson-card h4 {
    margin-bottom: 12px;
    font-size: 0.9rem;
}
.lesson-card ul, .lesson-card ol {
    padding-left: 20px;
    font-size: 0.85rem;
    line-height: 1.8;
    color: var(--text-secondary);
}
.lesson-card li { margin-bottom: 6px; }
.lesson-card strong { color: var(--text-primary); }

.lesson-warn {
    background: linear-gradient(135deg, rgba(245, 158, 11, 0.08), rgba(236, 72, 153, 0.05));
    border: 1px solid rgba(245, 158, 11, 0.2);
}
.lesson-warn h4 { color: var(--yellow); }

.lesson-info {
    background: linear-gradient(135deg, rgba(6, 182, 212, 0.08), rgba(139, 92, 246, 0.05));
    border: 1px solid rgba(6, 182, 212, 0.2);
}
.lesson-info h4 { color: var(--cyan); }

/* 实战演练响应式 */
@media (max-width: 1200px) {
    #challenge-container.active-container {
        grid-template-columns: 240px 1fr;
    }
}

@media (max-width: 992px) {
    #challenge-container.active-container {
        grid-template-columns: 1fr;
    }
    .challenge-sidebar-new {
        display: none;
    }
}

/* ═══════════════════════════════════════════════════════════════
   用户系统 - 顶部导航用户区域
   ═══════════════════════════════════════════════════════════════ */

.user-area {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-left: 16px;
}

.user-guest {
    display: flex;
    gap: 8px;
}

.btn-login {
    padding: 6px 16px;
    border: 1px solid rgba(139, 92, 246, 0.5);
    border-radius: 6px;
    background: transparent;
    color: var(--purple);
    font-size: 13px;
    cursor: pointer;
    transition: all 0.2s;
}
.btn-login:hover {
    background: rgba(139, 92, 246, 0.1);
    border-color: var(--purple);
}

.btn-register {
    padding: 6px 16px;
    border: none;
    border-radius: 6px;
    background: linear-gradient(135deg, #8b5cf6, #ec4899);
    color: #fff;
    font-size: 13px;
    cursor: pointer;
    transition: all 0.2s;
}
.btn-register:hover {
    opacity: 0.9;
    transform: translateY(-1px);
}

.user-logged {
    position: relative;
}

.user-avatar-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 4px 12px 4px 4px;
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: 20px;
    background: rgba(255,255,255,0.05);
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.2s;
}
.user-avatar-btn:hover {
    background: rgba(255,255,255,0.1);
    border-color: rgba(139, 92, 246, 0.4);
}

.user-avatar-text {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: linear-gradient(135deg, #8b5cf6, #ec4899);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 13px;
    font-weight: 700;
    color: #fff;
}

.user-nickname {
    font-size: 13px;
    max-width: 80px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.membership-badge {
    padding: 2px 6px;
    border-radius: 4px;
    background: linear-gradient(135deg, #f59e0b, #ef4444);
    color: #fff;
    font-size: 10px;
    font-weight: 700;
    letter-spacing: 0.5px;
}

/* 用户下拉菜单 */
.user-dropdown {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    width: 240px;
    background: #252542;
    border: 1px solid rgba(255,255,255,0.12);
    border-radius: 12px;
    box-shadow: 0 8px 32px rgba(0,0,0,0.6), 0 0 0 1px rgba(0,0,0,0.3);
    z-index: 1000;
    overflow: hidden;
    -webkit-backdrop-filter: none;
    backdrop-filter: none;
}

.user-dropdown-header {
    padding: 14px 16px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.user-dropdown-header span:first-child {
    font-size: 12px;
    color: var(--text-secondary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    max-width: 140px;
}

.dropdown-membership {
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 11px;
    font-weight: 600;
}
.dropdown-membership.free { background: rgba(255,255,255,0.08); color: var(--text-secondary); }
.dropdown-membership.pro { background: linear-gradient(135deg, #f59e0b, #ef4444); color: #fff; }
.dropdown-membership.trial { background: rgba(139, 92, 246, 0.2); color: var(--purple); }

.user-dropdown-divider {
    height: 1px;
    background: rgba(255,255,255,0.06);
}

.ai-usage-info {
    padding: 10px 16px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 12px;
    color: var(--text-secondary);
}
.ai-usage-info span:last-child {
    color: var(--purple);
    font-weight: 600;
}

.dropdown-item {
    display: block;
    width: 100%;
    padding: 10px 16px;
    border: none;
    background: none;
    color: var(--text-primary);
    font-size: 13px;
    text-align: left;
    cursor: pointer;
    transition: background 0.15s;
}
.dropdown-item:hover {
    background: rgba(255,255,255,0.05);
}
.dropdown-item.text-danger {
    color: #ef4444;
}

/* ═══════════════════════════════════════════════════════════════
   登录/注册弹窗
   ═══════════════════════════════════════════════════════════════ */

.auth-modal-content {
    width: 400px;
    max-width: 95vw;
    border-radius: 16px;
    padding: 0;
}

.auth-modal-inner {
    padding: 32px;
}

.auth-modal-header {
    text-align: center;
    margin-bottom: 28px;
}

.auth-logo {
    font-size: 28px;
    font-weight: 900;
    font-family: 'Space Mono', monospace;
    margin-bottom: 20px;
}
.auth-logo .accent { color: var(--purple); }

.auth-tabs {
    display: flex;
    background: rgba(255,255,255,0.05);
    border-radius: 8px;
    padding: 3px;
}

.auth-tab {
    flex: 1;
    padding: 8px 0;
    border: none;
    border-radius: 6px;
    background: transparent;
    color: var(--text-secondary);
    font-size: 14px;
    cursor: pointer;
    transition: all 0.2s;
}
.auth-tab.active {
    background: rgba(139, 92, 246, 0.2);
    color: var(--purple);
    font-weight: 600;
}

.auth-form {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}
.form-group label {
    font-size: 13px;
    color: var(--text-secondary);
    font-weight: 500;
}
.form-group input {
    padding: 10px 14px;
    border: 1px solid rgba(255,255,255,0.12);
    border-radius: 8px;
    background: rgba(255,255,255,0.05);
    color: var(--text-primary);
    font-size: 14px;
    transition: border-color 0.2s;
}
.form-group input:focus {
    outline: none;
    border-color: var(--purple);
    box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.15);
}
.form-group input::placeholder {
    color: rgba(255,255,255,0.25);
}

.auth-error {
    padding: 8px 12px;
    border-radius: 6px;
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.3);
    color: #ef4444;
    font-size: 13px;
}

.auth-submit {
    margin-top: 4px;
    padding: 12px;
    font-size: 15px;
    font-weight: 600;
    border-radius: 8px;
}

/* 登录方式切换 */
.login-type-toggle {
    display: flex;
    gap: 0;
    border: 1px solid rgba(255,255,255,0.12);
    border-radius: 8px;
    overflow: hidden;
    margin-bottom: 4px;
}
.login-type-btn {
    flex: 1;
    padding: 8px 0;
    font-size: 13px;
    font-weight: 500;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s;
}
.login-type-btn.active {
    background: var(--purple);
    color: #fff;
}
.login-type-btn:hover:not(.active) {
    background: rgba(255,255,255,0.06);
}

/* 验证码输入行 */
.sms-code-row {
    display: flex;
    gap: 10px;
    align-items: stretch;
}
.sms-code-row input {
    flex: 1;
    min-width: 0;
}
.btn-send-code {
    flex-shrink: 0;
    padding: 10px 16px;
    font-size: 13px;
    font-weight: 500;
    border: 1px solid var(--purple);
    border-radius: 8px;
    background: transparent;
    color: var(--purple);
    cursor: pointer;
    white-space: nowrap;
    transition: all 0.2s;
    min-width: 100px;
    text-align: center;
}
.btn-send-code:hover:not(:disabled) {
    background: rgba(139, 92, 246, 0.1);
}
.btn-send-code:disabled {
    border-color: rgba(255,255,255,0.12);
    color: var(--text-secondary);
    cursor: not-allowed;
    opacity: 0.6;
}

/* 图形验证码 */
.captcha-row {
    display: flex;
    gap: 10px;
    align-items: stretch;
}
.captcha-row input {
    flex: 1;
    min-width: 0;
}
.captcha-img-wrap {
    flex-shrink: 0;
    width: 150px;
    height: 44px;
    border: 1px solid var(--border);
    border-radius: 8px;
    overflow: hidden;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #1a1a2e;
    transition: border-color 0.2s;
}
.captcha-img-wrap:hover {
    border-color: var(--purple);
}
.captcha-img-wrap svg {
    width: 100%;
    height: 100%;
    display: block;
}
.captcha-loading {
    font-size: 12px;
    color: var(--text-secondary);
}
.captcha-fail {
    font-size: 11px;
    color: #ef4444;
    padding: 0 8px;
    text-align: center;
}

.auth-footer {
    text-align: center;
    margin-top: 20px;
    font-size: 13px;
    color: var(--text-secondary);
}
.auth-footer a {
    color: var(--purple);
    text-decoration: none;
    font-weight: 500;
}
.auth-footer a:hover {
    text-decoration: underline;
}

/* ═══════════════════════════════════════════════════════════════
   升级 Pro 弹窗
   ═══════════════════════════════════════════════════════════════ */

.upgrade-modal-content {
    width: 480px;
    max-width: 95vw;
    border-radius: 16px;
    padding: 0;
    overflow: hidden;
}

.upgrade-inner {
    padding: 36px 32px;
}

.upgrade-header {
    text-align: center;
    margin-bottom: 24px;
}
.upgrade-star {
    font-size: 40px;
    display: block;
    margin-bottom: 8px;
}
.upgrade-header h2 {
    font-size: 24px;
    font-weight: 800;
    background: linear-gradient(135deg, #f59e0b, #ec4899);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 8px;
}
.upgrade-subtitle {
    color: var(--text-secondary);
    font-size: 14px;
}

.upgrade-price {
    text-align: center;
    margin-bottom: 28px;
}
.price-amount {
    font-size: 48px;
    font-weight: 900;
    font-family: 'Space Mono', monospace;
    background: linear-gradient(135deg, #f59e0b, #ec4899);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}
.price-period {
    font-size: 18px;
    color: var(--text-secondary);
}

.upgrade-benefits {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-bottom: 28px;
}
.benefit-item {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 14px;
    color: var(--text-primary);
}
.benefit-icon {
    font-size: 18px;
    width: 24px;
    text-align: center;
}

.upgrade-actions {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-bottom: 16px;
}
.upgrade-pay-btn {
    padding: 14px;
    font-size: 15px;
    font-weight: 600;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.2s;
}
.upgrade-pay-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 16px rgba(0,0,0,0.3);
}

.upgrade-trial {
    text-align: center;
    font-size: 13px;
    color: var(--text-secondary);
    padding-top: 8px;
}
.upgrade-trial a {
    color: var(--purple);
    text-decoration: none;
    font-weight: 500;
}
.upgrade-trial a:hover {
    text-decoration: underline;
}

.upgrade-error {
    margin-top: 12px;
    padding: 8px 12px;
    border-radius: 6px;
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.3);
    color: #ef4444;
    font-size: 13px;
    text-align: center;
}

.upgrade-success {
    margin-top: 12px;
    padding: 8px 12px;
    border-radius: 6px;
    background: rgba(16, 185, 129, 0.1);
    border: 1px solid rgba(16, 185, 129, 0.3);
    color: #10b981;
    font-size: 13px;
    text-align: center;
}

/* ═══════════════════════════════════════════════════════════════
   个人中心页面
   ═══════════════════════════════════════════════════════════════ */

.profile-page {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    z-index: 2000;
    background: var(--bg);
    overflow-y: auto;
    animation: profileSlideIn 0.3s ease;
}
@keyframes profileSlideIn {
    from { opacity: 0; transform: translateX(30px); }
    to { opacity: 1; transform: translateX(0); }
}

.profile-page-inner {
    max-width: 960px;
    margin: 0 auto;
    padding: 0 24px 40px;
}

.profile-top-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 0;
    border-bottom: 1px solid var(--border);
    margin-bottom: 24px;
    position: sticky;
    top: 0;
    background: var(--bg);
    z-index: 10;
}

.profile-back-btn {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: rgba(255,255,255,0.05);
    color: var(--text-primary);
    font-size: 14px;
    cursor: pointer;
    transition: all 0.2s;
}
.profile-back-btn:hover {
    background: rgba(139, 92, 246, 0.15);
    border-color: rgba(139, 92, 246, 0.4);
}

.profile-close-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 38px;
    height: 38px;
    border: 1px solid var(--border);
    border-radius: 10px;
    background: rgba(255,255,255,0.05);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s;
}
.profile-close-btn:hover {
    background: rgba(239, 68, 68, 0.15);
    border-color: rgba(239, 68, 68, 0.4);
    color: #ef4444;
}

.profile-top-title {
    font-size: 18px;
    font-weight: 700;
    color: var(--text-primary);
}

.profile-content {
    display: flex;
    gap: 24px;
}

/* 左侧导航 */
.profile-sidebar {
    width: 200px;
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
    gap: 4px;
    position: sticky;
    top: 80px;
    align-self: flex-start;
}

.profile-nav-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 16px;
    border: none;
    border-radius: 10px;
    background: transparent;
    color: var(--text-secondary);
    font-size: 14px;
    cursor: pointer;
    transition: all 0.2s;
    text-align: left;
}
.profile-nav-item:hover {
    background: rgba(255,255,255,0.05);
    color: var(--text-primary);
}
.profile-nav-item.active {
    background: rgba(139, 92, 246, 0.15);
    color: var(--purple);
    font-weight: 600;
}
.profile-nav-item svg {
    flex-shrink: 0;
}

/* 右侧主区域 */
.profile-main {
    flex: 1;
    min-width: 0;
}

.profile-section {
    display: none;
}
.profile-section.active {
    display: block;
}

/* 通用卡片 */
.profile-card {
    background: #252542;
    border: 1px solid var(--border);
    border-radius: 14px;
    overflow: hidden;
}

.profile-card-header {
    padding: 18px 24px;
    border-bottom: 1px solid rgba(255,255,255,0.06);
}
.profile-card-header h3 {
    font-size: 16px;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0;
}

.profile-card-body {
    padding: 24px;
}

/* 头像区域 */
.profile-avatar-area {
    display: flex;
    align-items: center;
    gap: 20px;
    margin-bottom: 8px;
}

.profile-avatar-large {
    width: 72px;
    height: 72px;
    border-radius: 50%;
    background: linear-gradient(135deg, #8b5cf6, #ec4899);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    font-weight: 700;
    color: #fff;
    flex-shrink: 0;
    box-shadow: 0 4px 20px rgba(139, 92, 246, 0.3);
}

.profile-avatar-info {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.profile-display-name {
    font-size: 20px;
    font-weight: 700;
    color: var(--text-primary);
}

.profile-user-id {
    font-size: 12px;
    color: var(--text-muted);
    font-family: 'JetBrains Mono', monospace;
}

.profile-join-date {
    font-size: 12px;
    color: var(--text-muted);
}

.profile-form-divider {
    height: 1px;
    background: rgba(255,255,255,0.06);
    margin: 20px 0;
}

/* 表单 */
.profile-form-group {
    margin-bottom: 18px;
}

.profile-label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.profile-optional {
    font-weight: 400;
    color: var(--text-muted);
    font-size: 12px;
}

.profile-input-row {
    display: flex;
    gap: 10px;
    align-items: center;
}

.profile-input {
    flex: 1;
    padding: 10px 14px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: rgba(255,255,255,0.05);
    color: var(--text-primary);
    font-size: 14px;
    transition: border-color 0.2s;
    outline: none;
}
.profile-input:focus {
    border-color: rgba(139, 92, 246, 0.5);
    box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.1);
}
.profile-input:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}
.profile-input-full {
    width: 100%;
    max-width: 400px;
}

.profile-save-btn {
    padding: 10px 20px;
    border: none;
    border-radius: 8px;
    background: rgba(139, 92, 246, 0.2);
    color: var(--purple);
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    white-space: nowrap;
}
.profile-save-btn:hover {
    background: rgba(139, 92, 246, 0.35);
}

.profile-verified-badge {
    padding: 6px 12px;
    border-radius: 6px;
    background: rgba(16, 185, 129, 0.15);
    color: #10b981;
    font-size: 12px;
    font-weight: 600;
    white-space: nowrap;
}

.profile-msg {
    padding: 10px 14px;
    border-radius: 8px;
    font-size: 13px;
    margin-top: 12px;
}
.profile-msg-success {
    background: rgba(16, 185, 129, 0.1);
    border: 1px solid rgba(16, 185, 129, 0.3);
    color: #10b981;
}
.profile-msg-error {
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.3);
    color: #ef4444;
}

/* 会员卡片 */
.profile-membership-card {
    padding: 24px;
    border-radius: 12px;
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.1), rgba(236, 72, 153, 0.08));
    border: 1px solid rgba(139, 92, 246, 0.2);
    margin-bottom: 24px;
}
.profile-membership-card.pro {
    background: linear-gradient(135deg, rgba(245, 158, 11, 0.15), rgba(239, 68, 68, 0.1));
    border-color: rgba(245, 158, 11, 0.3);
}
.profile-membership-card.trial {
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.15), rgba(59, 130, 246, 0.08));
    border-color: rgba(139, 92, 246, 0.3);
}

.profile-membership-top {
    display: flex;
    align-items: center;
    gap: 16px;
}

.profile-membership-icon {
    font-size: 36px;
}

.profile-membership-type {
    font-size: 22px;
    font-weight: 800;
    color: var(--text-primary);
}
.profile-membership-desc {
    font-size: 13px;
    color: var(--text-secondary);
    margin-top: 2px;
}

.profile-membership-expire {
    margin-top: 16px;
    padding-top: 12px;
    border-top: 1px solid rgba(255,255,255,0.08);
    font-size: 13px;
    color: var(--text-secondary);
}
.profile-membership-expire span {
    color: var(--text-primary);
    font-weight: 600;
}

.profile-membership-features h4 {
    font-size: 14px;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0 0 16px;
}

.profile-feature-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
}

.profile-feature-item {
    padding: 16px;
    border-radius: 10px;
    background: rgba(255,255,255,0.03);
    border: 1px solid rgba(255,255,255,0.06);
    text-align: center;
}

.profile-feature-icon {
    font-size: 24px;
    margin-bottom: 8px;
}

.profile-feature-label {
    font-size: 12px;
    color: var(--text-muted);
    margin-bottom: 4px;
}

.profile-feature-value {
    font-size: 14px;
    font-weight: 700;
    color: var(--purple);
}

.profile-membership-actions {
    margin-top: 24px;
    text-align: center;
}

.profile-upgrade-btn {
    padding: 14px 48px;
    font-size: 15px;
    font-weight: 700;
    border-radius: 10px;
    background: linear-gradient(135deg, #8b5cf6, #ec4899);
    border: none;
    color: #fff;
    cursor: pointer;
    transition: all 0.2s;
}
.profile-upgrade-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 24px rgba(139, 92, 246, 0.4);
}

.profile-action-btn {
    margin-top: 16px;
    padding: 12px 32px;
    font-size: 14px;
    font-weight: 600;
    border-radius: 8px;
    background: linear-gradient(135deg, #8b5cf6, #ec4899);
    border: none;
    color: #fff;
    cursor: pointer;
    transition: all 0.2s;
}
.profile-action-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 16px rgba(139, 92, 246, 0.3);
}

/* 订单列表 */
.profile-orders-list {
    min-height: 60px;
}

.profile-empty-state {
    text-align: center;
    padding: 32px;
    color: var(--text-muted);
    font-size: 14px;
}

.profile-order-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 14px 0;
    border-bottom: 1px solid rgba(255,255,255,0.06);
}
.profile-order-item:last-child {
    border-bottom: none;
}

.profile-order-info {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.profile-order-name {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
}
.profile-order-date {
    font-size: 12px;
    color: var(--text-muted);
}

.profile-order-status {
    padding: 4px 10px;
    border-radius: 6px;
    font-size: 12px;
    font-weight: 600;
}
.profile-order-status.paid {
    background: rgba(16, 185, 129, 0.15);
    color: #10b981;
}
.profile-order-status.pending {
    background: rgba(245, 158, 11, 0.15);
    color: #f59e0b;
}

/* 安全设置 */
.profile-security-items {
    display: flex;
    flex-direction: column;
}

.profile-security-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 14px 0;
    border-bottom: 1px solid rgba(255,255,255,0.06);
}
.profile-security-row:last-child {
    border-bottom: none;
}

.profile-security-info {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
}

.profile-security-label {
    font-size: 14px;
    color: var(--text-primary);
}

.profile-security-status {
    font-size: 13px;
    color: var(--text-muted);
}
.profile-security-status.profile-security-ok {
    color: #10b981;
}

/* 使用统计 */
.profile-usage-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
}

.profile-usage-card {
    padding: 20px;
    border-radius: 12px;
    background: rgba(255,255,255,0.03);
    border: 1px solid rgba(255,255,255,0.06);
    text-align: center;
}

.profile-usage-number {
    font-size: 36px;
    font-weight: 800;
    color: var(--purple);
    font-family: 'Space Mono', monospace;
}

.profile-usage-label {
    font-size: 13px;
    color: var(--text-secondary);
    margin: 4px 0 12px;
}

.profile-usage-bar {
    height: 6px;
    border-radius: 3px;
    background: rgba(255,255,255,0.08);
    overflow: hidden;
    margin-bottom: 8px;
}

.profile-usage-bar-fill {
    height: 100%;
    border-radius: 3px;
    background: linear-gradient(90deg, #8b5cf6, #ec4899);
    transition: width 0.6s ease;
}
.profile-usage-bar-green {
    background: linear-gradient(90deg, #10b981, #34d399);
}

.profile-usage-detail {
    font-size: 12px;
    color: var(--text-muted);
}

/* 学习概览统计 */
.profile-stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
}

.profile-stat-item {
    text-align: center;
    padding: 20px 12px;
    border-radius: 12px;
    background: rgba(255,255,255,0.03);
    border: 1px solid rgba(255,255,255,0.06);
    transition: all 0.2s;
}
.profile-stat-item:hover {
    background: rgba(139, 92, 246, 0.08);
    border-color: rgba(139, 92, 246, 0.2);
}

.profile-stat-icon {
    font-size: 28px;
    margin-bottom: 8px;
}

.profile-stat-value {
    font-size: 24px;
    font-weight: 800;
    color: var(--text-primary);
    font-family: 'Space Mono', monospace;
}

.profile-stat-label {
    font-size: 12px;
    color: var(--text-muted);
    margin-top: 4px;
}

/* 响应式 */
@media (max-width: 768px) {
    .profile-content {
        flex-direction: column;
    }
    .profile-sidebar {
        width: 100%;
        flex-direction: row;
        overflow-x: auto;
        position: static;
        gap: 4px;
        padding-bottom: 8px;
    }
    .profile-nav-item {
        white-space: nowrap;
        padding: 10px 14px;
        font-size: 13px;
    }
    .profile-feature-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .profile-stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .profile-usage-grid {
        grid-template-columns: 1fr;
    }
}

/* ═══ 内容锁定 - 延伸专题/面试/实战 ═══ */
.ext-card-locked {
    opacity: 0.5;
    cursor: not-allowed;
    filter: grayscale(0.3);
    position: relative;
}
.ext-card-locked:hover {
    transform: none !important;
    box-shadow: none !important;
}
.ext-locked-badge {
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.3), rgba(236, 72, 153, 0.25));
    color: #c4b5fd;
    padding: 2px 10px;
    border-radius: 10px;
    font-size: 0.72rem;
    font-weight: 600;
}
.ext-tag.locked-tag,
.iv-tag.locked-tag {
    background: rgba(139, 92, 246, 0.15) !important;
    color: #a78bfa !important;
    border: 1px solid rgba(139, 92, 246, 0.25) !important;
}
.iv-card-locked {
    opacity: 0.5;
    cursor: not-allowed;
    filter: grayscale(0.3);
}
.iv-card-locked:hover {
    transform: none !important;
    box-shadow: none !important;
}
.challenge-card.locked {
    opacity: 0.5;
    cursor: not-allowed;
    filter: grayscale(0.3);
}
.challenge-card.locked:hover {
    background: none !important;
    border-color: rgba(255,255,255,0.06) !important;
}
.tag-locked {
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.25), rgba(236, 72, 153, 0.2)) !important;
    color: #c4b5fd !important;
    font-weight: 600;
}

/* 周tab锁定 */
.week-tab.week-locked {
    position: relative;
}
.week-tab.week-locked::after {
    content: "";
    position: absolute;
    top: 4px;
    right: 4px;
    width: 10px;
    height: 12px;
    border: 1.5px solid var(--text-muted);
    border-radius: 2px;
    box-shadow: 0 -4px 0 0 transparent;
}
.week-tab.week-locked::before {
    content: "";
    position: absolute;
    top: 0px;
    right: 6px;
    width: 6px;
    height: 5px;
    border: 1.5px solid var(--text-muted);
    border-bottom: none;
    border-radius: 4px 4px 0 0;
}

/* ═══ 锁定提示弹窗 ═══ */
.locked-tip-overlay {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    z-index: 3000;
    background: rgba(0,0,0,0.6);
    -webkit-backdrop-filter: blur(6px);
    backdrop-filter: blur(6px);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.3s ease;
}
.locked-tip-overlay.visible {
    opacity: 1;
}
.locked-tip-card {
    background: #252542;
    border: 1px solid rgba(139, 92, 246, 0.3);
    border-radius: 20px;
    padding: 36px 32px 28px;
    max-width: 420px;
    width: 90%;
    text-align: center;
    position: relative;
    box-shadow: 0 20px 60px rgba(0,0,0,0.5), 0 0 40px rgba(139, 92, 246, 0.1);
    animation: lockedTipIn 0.35s ease-out;
}
@keyframes lockedTipIn {
    from { opacity: 0; transform: scale(0.9) translateY(20px); }
    to { opacity: 1; transform: scale(1) translateY(0); }
}
.locked-tip-icon {
    font-size: 48px;
    margin-bottom: 12px;
}
.locked-tip-title {
    font-size: 1.3rem;
    font-weight: 700;
    color: #fff;
    margin-bottom: 8px;
    background: linear-gradient(135deg, #a78bfa, #ec4899);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}
.locked-tip-desc {
    font-size: 0.9rem;
    color: rgba(255,255,255,0.7);
    line-height: 1.6;
    margin-bottom: 20px;
}
.locked-tip-desc span {
    color: #c4b5fd;
    font-weight: 600;
}
.locked-tip-benefits {
    text-align: left;
    margin-bottom: 24px;
    background: rgba(139, 92, 246, 0.06);
    border-radius: 12px;
    padding: 14px 16px;
}
.locked-tip-benefit {
    font-size: 0.82rem;
    color: rgba(255,255,255,0.75);
    padding: 5px 0;
    line-height: 1.5;
}
.locked-tip-actions {
    display: flex;
    flex-direction: column;
    gap: 10px;
}
.locked-tip-upgrade {
    background: linear-gradient(135deg, #8b5cf6, #ec4899);
    color: #fff;
    border: none;
    padding: 13px 24px;
    border-radius: 12px;
    font-size: 1rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.2s;
}
.locked-tip-upgrade:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(139, 92, 246, 0.4);
}
.locked-tip-trial {
    background: transparent;
    color: #a78bfa;
    border: 1px solid rgba(139, 92, 246, 0.3);
    padding: 10px 24px;
    border-radius: 12px;
    font-size: 0.88rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
}
.locked-tip-trial:hover {
    background: rgba(139, 92, 246, 0.1);
    border-color: rgba(139, 92, 246, 0.5);
}
.locked-tip-close {
    position: absolute;
    top: 12px;
    right: 14px;
    background: none;
    border: none;
    color: rgba(255,255,255,0.4);
    font-size: 1.1rem;
    cursor: pointer;
    padding: 4px 8px;
}
.locked-tip-close:hover {
    color: #fff;
}

/* 学习路径Tab Pro标识 */
.track-pro-badge {
    position: absolute;
    top: 4px;
    right: 6px;
    background: linear-gradient(135deg, #8b5cf6, #ec4899);
    color: #fff;
    font-size: 0.58rem;
    font-weight: 700;
    padding: 1px 6px;
    border-radius: 6px;
    letter-spacing: 0.5px;
    line-height: 1.4;
}
.track-pro-badge.track-pro-partial {
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.5), rgba(236, 72, 153, 0.4));
    font-size: 0.52rem;
}
.track-tab {
    position: relative;
}

/* ═══════════════════════════════════════════════════════════════
   案例研究中心 (Case Study Hub)
   ═══════════════════════════════════════════════════════════════ */

#casestudy-container {
    display: none;
    grid-template-columns: 280px 1fr;
    gap: 0;
    height: calc(100vh - 60px - 56px);
}
#casestudy-container.active-container {
    display: grid;
}

/* 侧边栏 */
.casestudy-sidebar { min-width: 260px; max-width: 280px; overflow-y: auto; padding: 16px; }
.cs-filter-section { margin-bottom: 16px; }
.cs-filter-section h4 { font-size: 0.82rem; color: var(--text-secondary); margin-bottom: 8px; font-weight: 600; }
.cs-filter-chips { display: flex; flex-wrap: wrap; gap: 4px; }
.cs-tag-chips { max-height: 180px; overflow-y: auto; }
.cs-tag-chip { font-size: 0.72rem !important; padding: 2px 8px !important; }

/* 主区域头部 */
.cs-header { display: flex; justify-content: space-between; align-items: flex-start; margin-bottom: 20px; gap: 16px; flex-wrap: wrap; }
.cs-header-left h2 { font-size: 1.35rem; font-weight: 700; margin: 0 0 6px 0; }
.cs-header-left p { font-size: 0.82rem; color: var(--text-muted); margin: 0; }
.cs-header-actions { display: flex; gap: 8px; align-items: center; }
.cs-main { flex: 1; min-width: 0; padding: 20px; overflow-y: auto; max-height: calc(100vh - 180px); }

/* 活跃筛选标签 */
.cs-active-filters { display: flex; align-items: center; gap: 8px; padding: 8px 12px; background: rgba(139, 92, 246, 0.06); border-radius: 8px; margin-bottom: 16px; flex-wrap: wrap; }
.cs-filter-label { font-size: 0.78rem; color: var(--text-muted); white-space: nowrap; }
.cs-active-tag { display: inline-flex; align-items: center; gap: 4px; background: rgba(139, 92, 246, 0.12); color: var(--text-primary); padding: 3px 10px; border-radius: 12px; font-size: 0.75rem; }
.cs-active-tag button { background: none; border: none; cursor: pointer; font-size: 0.85rem; color: var(--text-muted); padding: 0 2px; line-height: 1; }
.cs-active-tag button:hover { color: #ef4444; }

/* 案例卡片网格 */
.cs-cards-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(340px, 1fr)); gap: 16px; }

/* 案例卡片 */
.cs-card {
    background: var(--card-bg, rgba(255,255,255,0.03));
    border: 1px solid var(--border-color, rgba(255,255,255,0.08));
    border-radius: 12px;
    padding: 18px;
    cursor: pointer;
    transition: all 0.25s ease;
    position: relative;
    overflow: hidden;
}
.cs-card:hover {
    border-color: rgba(139, 92, 246, 0.4);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(139, 92, 246, 0.12);
}
.cs-card-read { opacity: 0.75; }
.cs-card-read:hover { opacity: 1; }

/* 锁定案例卡片（Pro 会员专属） */
.cs-card.cs-card-locked {
    opacity: 0.6;
    cursor: not-allowed;
    filter: grayscale(0.25);
    position: relative;
}
.cs-card.cs-card-locked:hover {
    transform: none;
    box-shadow: none;
    border-color: rgba(139, 92, 246, 0.15);
    opacity: 0.7;
}
.cs-card.cs-card-locked .cs-card-summary {
    -webkit-line-clamp: 2;
    color: var(--text-muted);
}
.cs-card.cs-card-locked .cs-card-title {
    color: var(--text-muted);
}
.cs-metric-locked {
    background: rgba(139, 92, 246, 0.15) !important;
    color: #a78bfa !important;
    font-style: italic;
}
.cs-pro-badge {
    position: absolute;
    top: 10px;
    right: 10px;
    font-size: 0.65rem;
    font-weight: 800;
    color: #fff;
    background: linear-gradient(135deg, #8b5cf6, #ec4899);
    padding: 3px 10px;
    border-radius: 8px;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    box-shadow: 0 2px 8px rgba(139, 92, 246, 0.35);
}

.cs-card-header { display: flex; align-items: center; gap: 8px; margin-bottom: 10px; }
.cs-card-icon { font-size: 1.5rem; }
.cs-card-meta { flex: 1; display: flex; flex-direction: column; }
.cs-card-company { font-size: 0.82rem; font-weight: 600; color: var(--text-primary); }
.cs-card-year { font-size: 0.7rem; color: var(--text-muted); }
.cs-card-diff { font-size: 0.65rem; font-weight: 700; color: #fff; padding: 2px 8px; border-radius: 6px; text-transform: uppercase; white-space: nowrap; }

.cs-card-title { font-size: 0.92rem; font-weight: 700; line-height: 1.4; margin: 0 0 8px 0; color: var(--text-primary); display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }

.cs-card-summary { font-size: 0.78rem; line-height: 1.55; color: var(--text-secondary); margin: 0 0 10px 0; display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }

.cs-card-metrics { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 10px; }
.cs-metric-tag { font-size: 0.7rem; background: rgba(139, 92, 246, 0.1); color: var(--text-primary); padding: 3px 8px; border-radius: 6px; }
.cs-metric-tag strong { color: #8b5cf6; margin-right: 2px; }

.cs-card-tags { display: flex; flex-wrap: wrap; gap: 4px; }
.cs-tag { font-size: 0.68rem; background: rgba(255,255,255,0.05); color: var(--text-muted); padding: 2px 7px; border-radius: 4px; border: 1px solid rgba(255,255,255,0.06); }
.cs-tag-more { background: rgba(139, 92, 246, 0.08); color: #8b5cf6; }

.cs-read-badge { position: absolute; top: 10px; right: 10px; font-size: 0.68rem; color: #10b981; background: rgba(16, 185, 129, 0.1); padding: 2px 8px; border-radius: 8px; }

/* 案例详情 */
.cs-detail-header { margin-bottom: 20px; }
.cs-detail-header h2 { font-size: 1.4rem; font-weight: 800; line-height: 1.4; margin: 0 0 12px 0; }
.cs-detail-meta { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; margin-bottom: 10px; }
.cs-meta-item { font-size: 0.82rem; color: var(--text-secondary); }
.cs-detail-tags { display: flex; flex-wrap: wrap; gap: 5px; }

.cs-insight-box {
    display: flex; gap: 12px; align-items: flex-start;
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.08), rgba(236, 72, 153, 0.06));
    border: 1px solid rgba(139, 92, 246, 0.2);
    border-radius: 12px; padding: 16px; margin-bottom: 24px;
}
.cs-insight-icon { font-size: 1.6rem; flex-shrink: 0; }
.cs-insight-text { font-size: 0.88rem; line-height: 1.6; color: var(--text-primary); }

.cs-detail-body { margin-bottom: 24px; }
.cs-detail-body h3 { font-size: 1.1rem; font-weight: 700; margin: 24px 0 12px 0; padding-bottom: 6px; border-bottom: 1px solid rgba(255,255,255,0.08); }
.cs-detail-body ul { padding-left: 20px; }
.cs-detail-body li { font-size: 0.85rem; line-height: 1.7; margin-bottom: 4px; }
.cs-detail-body p { font-size: 0.85rem; line-height: 1.7; }

/* 案例详情中的指标卡片 */
.case-metrics { display: flex; flex-wrap: wrap; gap: 12px; margin: 16px 0; }
.metric-card {
    flex: 1; min-width: 120px;
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.1), rgba(236, 72, 153, 0.06));
    border: 1px solid rgba(139, 92, 246, 0.15);
    border-radius: 10px; padding: 14px; text-align: center;
    display: flex; flex-direction: column; gap: 4px;
}
.metric-value { font-size: 1.3rem; font-weight: 800; color: #8b5cf6; }
.metric-label { font-size: 0.72rem; color: var(--text-muted); }

/* 案例教训样式 */
.case-lessons { margin: 12px 0; }
.lesson-point { margin-bottom: 14px; padding: 12px; background: rgba(255,255,255,0.02); border-radius: 8px; border-left: 3px solid #8b5cf6; }
.lesson-point strong { font-size: 0.88rem; color: var(--text-primary); display: block; margin-bottom: 4px; }
.lesson-point p { font-size: 0.82rem; color: var(--text-secondary); line-height: 1.6; margin: 0; }

.case-source { font-size: 0.78rem; color: var(--text-muted); font-style: italic; margin-top: 16px; padding-top: 12px; border-top: 1px solid rgba(255,255,255,0.06); }

/* 关联课程 */
.cs-related-lessons { margin-top: 24px; padding-top: 20px; border-top: 1px solid rgba(255,255,255,0.08); }
.cs-related-lessons h3 { font-size: 1.05rem; margin-bottom: 12px; border-bottom: none !important; }
.cs-related-grid { display: flex; flex-wrap: wrap; gap: 8px; }
.cs-related-btn {
    display: flex; align-items: center; gap: 6px;
    background: rgba(139, 92, 246, 0.08); border: 1px solid rgba(139, 92, 246, 0.15);
    border-radius: 8px; padding: 8px 14px; cursor: pointer;
    font-size: 0.82rem; color: var(--text-primary);
    transition: all 0.2s;
}
.cs-related-btn:hover { background: rgba(139, 92, 246, 0.18); border-color: rgba(139, 92, 246, 0.3); }
.cs-related-icon { font-size: 1.1rem; }

/* 空状态 */
.cs-empty { text-align: center; padding: 60px 20px; color: var(--text-muted); }
.cs-empty p { font-size: 1.1rem; margin-bottom: 12px; }

/* 详情导航 */
.cs-detail-nav { display: flex; gap: 8px; align-items: center; }

/* 案例研究响应式 */
@media (max-width: 1200px) {
    #casestudy-container.active-container {
        grid-template-columns: 240px 1fr;
    }
}
@media (max-width: 992px) {
    #casestudy-container.active-container {
        grid-template-columns: 1fr;
    }
    .casestudy-sidebar {
        display: none;
    }
    .cs-cards-grid {
        grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    }
}