/* ================================================================
   SemanticFilter — Professional Academic Demo Stylesheet
   ================================================================ */

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

:root {
    --primary: #1a56db;
    --primary-dark: #1e40af;
    --primary-light: #f0f4ff;
    --primary-subtle: #e0e7ff;
    --accent: #0e7490;
    --text: #1e293b;
    --text-secondary: #475569;
    --text-muted: #94a3b8;
    --border: #e2e8f0;
    --border-light: #f1f5f9;
    --bg: #f8fafc;
    --bg-alt: #f1f5f9;
    --white: #ffffff;
    --success: #15803d;
    --success-bg: #f0fdf4;
    --error: #b91c1c;
    --error-bg: #fef2f2;
    --shadow-xs: 0 1px 2px rgba(0,0,0,0.04);
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.05), 0 1px 2px rgba(0,0,0,0.03);
    --shadow: 0 4px 6px -1px rgba(0,0,0,0.06), 0 2px 4px -2px rgba(0,0,0,0.04);
    --shadow-md: 0 10px 15px -3px rgba(0,0,0,0.06), 0 4px 6px -4px rgba(0,0,0,0.04);
    --shadow-lg: 0 20px 25px -5px rgba(0,0,0,0.06), 0 8px 10px -6px rgba(0,0,0,0.03);
    --radius: 6px;
    --radius-lg: 10px;
    --radius-xl: 14px;
    --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --max-width: 1120px;
    --transition: 0.2s ease;

    /* Academic method colors — muted, paper-friendly */
    --color-tree: #1a56db;
    --color-semantic: #b45309;
    --color-hyperedge: #6d28d9;
    --color-combined: #15803d;
}

html { scroll-behavior: smooth; }

body {
    font-family: var(--font);
    background: var(--white);
    color: var(--text);
    line-height: 1.6;
    font-size: 15px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ── Navigation ── */
nav {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255,255,255,0.92);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
}

.nav-inner {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1em;
    font-weight: 700;
    color: var(--text);
    text-decoration: none;
    letter-spacing: -0.3px;
}

.nav-logo {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    background: var(--primary);
    color: white;
    border-radius: 8px;
    font-size: 0.75em;
    font-weight: 800;
    letter-spacing: 0;
}

.nav-links {
    display: flex;
    gap: 2px;
    list-style: none;
}

.nav-links a {
    display: block;
    padding: 8px 14px;
    font-size: 0.875em;
    font-weight: 500;
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: 6px;
    transition: color var(--transition), background var(--transition);
}

.nav-links a:hover {
    color: var(--primary);
    background: var(--primary-light);
}

.nav-cta {
    display: inline-flex;
    align-items: center;
    padding: 7px 16px;
    font-size: 0.85em;
    font-weight: 600;
    color: white;
    background: var(--primary);
    text-decoration: none;
    border-radius: 6px;
    transition: background var(--transition);
}

.nav-cta:hover {
    background: var(--primary-dark);
}

/* ── Hero ── */
.hero {
    background: linear-gradient(180deg, var(--primary-light) 0%, var(--white) 100%);
    border-bottom: 1px solid var(--border);
    padding: 80px 24px 72px;
    text-align: center;
}

.hero-inner {
    max-width: 800px;
    margin: 0 auto;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: var(--primary);
    color: white;
    padding: 6px 18px;
    border-radius: 24px;
    font-size: 0.75em;
    font-weight: 700;
    letter-spacing: 1px;
    text-transform: uppercase;
    margin-bottom: 28px;
}

.hero h1 {
    font-size: 2.75em;
    font-weight: 800;
    color: var(--text);
    letter-spacing: -1.5px;
    line-height: 1.15;
    margin-bottom: 24px;
}

.hero-abstract {
    font-size: 1.05em;
    color: var(--text-secondary);
    line-height: 1.75;
    max-width: 680px;
    margin: 0 auto 36px;
}

.hero-abstract strong {
    color: var(--primary);
    font-weight: 600;
}

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

.btn-primary, .btn-outline {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 28px;
    border-radius: var(--radius);
    font-size: 0.95em;
    font-weight: 600;
    text-decoration: none;
    border: none;
    cursor: pointer;
    transition: all var(--transition);
}

.btn-primary {
    background: var(--primary);
    color: white;
}

.btn-primary:hover {
    background: var(--primary-dark);
    box-shadow: 0 4px 14px rgba(37,99,235,0.3);
    transform: translateY(-1px);
}

.btn-outline {
    background: white;
    color: var(--primary);
    border: 1.5px solid var(--primary);
}

.btn-outline:hover {
    background: var(--primary-light);
    transform: translateY(-1px);
}

/* ── Sections ── */
.section {
    padding: 80px 24px;
}

.section-alt {
    background: var(--bg);
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
}

.section-header {
    margin-bottom: 48px;
}

.section-label {
    font-size: 0.8em;
    font-weight: 700;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    color: var(--primary);
    margin-bottom: 12px;
}

.section-title {
    font-size: 1.85em;
    font-weight: 800;
    letter-spacing: -0.8px;
    color: var(--text);
    margin-bottom: 14px;
    line-height: 1.2;
}

.section-desc {
    font-size: 1em;
    color: var(--text-secondary);
    line-height: 1.75;
    max-width: 680px;
}

/* ── Overview Cards ── */
.overview-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.overview-card {
    background: white;
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 28px 24px;
    transition: box-shadow var(--transition), transform var(--transition);
}

.overview-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-3px);
}

.card-icon {
    width: 44px;
    height: 44px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 16px;
}

.icon-blue { background: var(--primary-subtle); color: var(--primary); }
.icon-teal { background: #ccfbf1; color: #0d9488; }
.icon-purple { background: #f3e8ff; color: #7c3aed; }
.icon-green { background: #dcfce7; color: #16a34a; }
.icon-orange { background: #ffedd5; color: #ea580c; }

.overview-card h3 {
    font-size: 0.95em;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 8px;
}

.overview-card p {
    font-size: 0.875em;
    color: var(--text-secondary);
    line-height: 1.65;
}

/* ── Capabilities Tiers ── */
.capabilities-tiers {
    max-width: 800px;
}

.tier {
    background: white;
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 28px 32px;
    transition: box-shadow var(--transition);
}

.tier:hover {
    box-shadow: var(--shadow);
}

.tier-header {
    display: flex;
    gap: 20px;
    align-items: flex-start;
}

.tier-number {
    flex-shrink: 0;
    width: 40px;
    height: 40px;
    background: var(--primary);
    color: white;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1em;
    font-weight: 800;
}

.tier-info h3 {
    font-size: 1.05em;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 6px;
}

.tier-info p {
    font-size: 0.9em;
    color: var(--text-secondary);
    line-height: 1.65;
}

.tier-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 16px;
    padding-left: 60px;
}

.tier-tag {
    display: inline-block;
    padding: 4px 12px;
    background: var(--primary-light);
    color: var(--primary);
    border-radius: 20px;
    font-size: 0.8em;
    font-weight: 600;
}

.tier-connector {
    width: 2px;
    height: 28px;
    background: var(--border);
    margin: 0 0 0 48px;
}

/* ── Architecture ── */
.arch-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    align-items: start;
}

.pipeline-steps {
    display: flex;
    flex-direction: column;
}

.pipeline-step {
    display: flex;
    gap: 16px;
    position: relative;
}

.pipeline-step:not(:last-child)::before {
    content: '';
    position: absolute;
    left: 19px;
    top: 44px;
    bottom: 0;
    width: 2px;
    background: var(--border);
}

.step-dot {
    flex-shrink: 0;
    width: 38px;
    height: 38px;
    border-radius: 50%;
    background: var(--primary);
    color: white;
    font-size: 0.82em;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 3px solid white;
    box-shadow: 0 0 0 2px var(--primary);
    z-index: 1;
}

.step-body {
    padding-bottom: 28px;
}

.step-body h4 {
    font-size: 0.95em;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 4px;
}

.step-body p {
    font-size: 0.875em;
    color: var(--text-secondary);
    line-height: 1.65;
}

.arch-diagram {
    background: white;
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 28px 24px;
    box-shadow: var(--shadow-sm);
}

.arch-diagram h4 {
    font-size: 0.8em;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--primary);
    margin-bottom: 20px;
}

.arch-layer {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 14px 16px;
}

.arch-layer-title {
    font-weight: 700;
    color: var(--text);
    margin-bottom: 8px;
    font-size: 0.88em;
}

.arch-layer-items {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.arch-tag {
    background: white;
    color: var(--text-secondary);
    padding: 3px 10px;
    border-radius: 20px;
    font-size: 0.8em;
    font-weight: 500;
    border: 1px solid var(--border);
}

.arch-arrow {
    display: flex;
    justify-content: center;
    color: var(--text-muted);
    padding: 8px 0;
}

/* ── Demo Panel ── */
.demo-panel {
    background: white;
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
}

.demo-panel-header {
    background: linear-gradient(135deg, var(--primary) 0%, #3b82f6 50%, #0ea5e9 100%);
    padding: 24px 32px;
    color: white;
}

.demo-panel-header h3 {
    font-size: 1.1em;
    font-weight: 700;
    margin-bottom: 2px;
}

.demo-panel-header p {
    font-size: 0.85em;
    opacity: 0.85;
}

.demo-panel-body {
    padding: 28px;
}

/* Step cards */
.demo-step-card {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 24px;
    margin-bottom: 16px;
}

.demo-step-title {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 0.95em;
    color: var(--text);
    margin-bottom: 16px;
}

.step-num {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 26px;
    height: 26px;
    background: var(--primary);
    color: white;
    border-radius: 50%;
    font-size: 0.8em;
    font-weight: 700;
    flex-shrink: 0;
}

/* Upload area */
.upload-area {
    border: 2px dashed var(--border);
    border-radius: var(--radius-lg);
    padding: 40px 24px;
    text-align: center;
    cursor: pointer;
    transition: all var(--transition);
    background: white;
}

.upload-area:hover {
    border-color: var(--primary);
    background: var(--primary-light);
}

.upload-area.dragover {
    border-color: var(--primary);
    background: var(--primary-subtle);
    border-style: solid;
}

#fileInput { display: none; }

.upload-icon {
    color: var(--text-muted);
    margin-bottom: 12px;
}

.upload-area:hover .upload-icon { color: var(--primary); }

.upload-text-main {
    font-size: 0.95em;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 4px;
}

.upload-text-sub {
    font-size: 0.83em;
    color: var(--text-muted);
}

/* Form controls */
input[type="text"], input[type="number"], textarea, select {
    width: 100%;
    padding: 11px 14px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 0.92em;
    font-family: inherit;
    color: var(--text);
    background: white;
    transition: border-color var(--transition), box-shadow var(--transition);
}

input[type="text"]:focus, input[type="number"]:focus, textarea:focus, select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37,99,235,0.1);
}

input::placeholder, textarea::placeholder { color: var(--text-muted); }

.btn {
    background: var(--primary);
    color: white;
    padding: 12px 28px;
    border: none;
    border-radius: var(--radius);
    font-size: 0.92em;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition);
    margin-top: 12px;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.btn:hover:not(:disabled) {
    background: var(--primary-dark);
    box-shadow: 0 4px 12px rgba(37,99,235,0.25);
}

.btn:disabled { opacity: 0.5; cursor: not-allowed; }

.btn-small {
    background: var(--primary);
    color: white;
    padding: 9px 18px;
    border: none;
    border-radius: var(--radius);
    font-size: 0.88em;
    font-weight: 600;
    cursor: pointer;
    transition: background var(--transition);
    white-space: nowrap;
}

.btn-small:hover:not(:disabled) { background: var(--primary-dark); }
.btn-small:disabled { opacity: 0.5; cursor: not-allowed; }

/* Status */
.status {
    padding: 12px 16px;
    border-radius: var(--radius);
    margin-top: 12px;
    font-size: 0.88em;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 8px;
}

.status.info { background: var(--primary-light); color: #1e40af; border: 1px solid var(--primary-subtle); }
.status.success { background: var(--success-bg); color: #065f46; border: 1px solid #a7f3d0; }
.status.error { background: var(--error-bg); color: #991b1b; border: 1px solid #fecaca; }

/* Document list */
.document-list { margin-top: 16px; }

.doc-list-label {
    font-size: 0.78em;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.8px;
    color: var(--text-muted);
    margin-bottom: 8px;
}

.document-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 14px;
    background: white;
    border: 1px solid var(--border);
    border-radius: 8px;
    margin-bottom: 6px;
    font-size: 0.88em;
}

.document-name { font-weight: 500; color: var(--text); }
.document-size { color: var(--text-muted); font-size: 0.85em; }

/* Results */
.results { display: none; }
.results.show { display: block; animation: fadeIn 0.4s ease; }

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.results-summary {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 14px;
    margin-bottom: 24px;
}

.result-item {
    padding: 20px;
    border-radius: var(--radius-lg);
    text-align: center;
    border: 2px solid var(--border);
    background: white;
    transition: all var(--transition);
}

.result-item.match {
    background: var(--success-bg);
    border-color: #34d399;
}

.result-item.no-match {
    background: var(--error-bg);
    border-color: #fca5a5;
}

.result-item h4 {
    font-size: 0.75em;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.8px;
    font-weight: 700;
    margin-bottom: 10px;
}

.result-value {
    font-size: 2em;
    font-weight: 800;
    letter-spacing: -1px;
}

.result-item.match .result-value { color: var(--success); }
.result-item.no-match .result-value { color: var(--error); }

.result-sub {
    font-size: 0.75em;
    color: var(--text-muted);
    margin-top: 6px;
}

/* Doc results */
.filtered-docs { margin-top: 20px; }

.results-sub-label {
    font-size: 0.78em;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.8px;
    color: var(--text-muted);
    margin-bottom: 10px;
    padding-top: 20px;
    border-top: 1px solid var(--border);
}

.doc-result {
    background: white;
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 14px 16px;
    margin-bottom: 8px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.88em;
}

.doc-result.matched {
    background: var(--success-bg);
    border-color: #6ee7b7;
}

.doc-result-name { font-weight: 600; color: var(--text); }

.doc-result-strategies { display: flex; gap: 6px; }

.strategy-badge {
    padding: 3px 9px;
    border-radius: 4px;
    font-size: 0.78em;
    font-weight: 600;
}

.strategy-badge.match { background: var(--success); color: white; }
.strategy-badge.no-match { background: #e2e8f0; color: var(--text-muted); }

/* Metrics */
.metrics-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
    margin-top: 20px;
    padding-top: 20px;
    border-top: 1px solid var(--border);
}

.metric {
    text-align: center;
    padding: 16px;
    background: white;
    border: 1px solid var(--border);
    border-radius: var(--radius);
}

.metric-value {
    font-size: 1.5em;
    font-weight: 800;
    color: var(--primary);
    letter-spacing: -0.5px;
}

.metric-label {
    font-size: 0.78em;
    color: var(--text-muted);
    margin-top: 6px;
    font-weight: 500;
}

/* Loading spinner */
.loading {
    display: inline-block;
    width: 14px;
    height: 14px;
    border: 2px solid rgba(255,255,255,0.3);
    border-radius: 50%;
    border-top-color: white;
    animation: spin 0.7s linear infinite;
    vertical-align: middle;
}

.loading-blue {
    border-color: rgba(37,99,235,0.2);
    border-top-color: var(--primary);
}

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

/* Settings */
.settings-panel {
    background: white;
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    margin-bottom: 16px;
    overflow: hidden;
}

.settings-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 14px 20px;
    cursor: pointer;
    user-select: none;
    border-bottom: 1px solid transparent;
    transition: background var(--transition);
}

.settings-header:hover { background: var(--bg); }
.settings-header.open { border-bottom-color: var(--border); }

.settings-title {
    font-size: 0.88em;
    font-weight: 600;
    color: var(--text-secondary);
}

.settings-toggle {
    color: var(--text-muted);
    transition: transform var(--transition);
    display: flex;
    align-items: center;
}

.settings-toggle.open { transform: rotate(180deg); }

.settings-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
    padding: 0 20px;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease, padding 0.3s ease;
}

.settings-content.show { max-height: 300px; padding: 20px; }

.setting-item { display: flex; flex-direction: column; gap: 6px; }
.setting-label { font-size: 0.88em; font-weight: 600; color: var(--text); }
.setting-description { font-size: 0.78em; color: var(--text-muted); }

.settings-reset {
    padding: 7px 14px;
    background: var(--bg);
    color: var(--text-muted);
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 0.82em;
    cursor: pointer;
    font-weight: 600;
    transition: background var(--transition);
    align-self: flex-end;
    margin-top: auto;
}

.settings-reset:hover { background: var(--border); }

/* Tree viewer */
.tree-controls {
    display: flex;
    gap: 10px;
    margin-bottom: 12px;
}

.tree-select {
    flex: 1;
    padding: 9px 14px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 0.88em;
    background: white;
    cursor: pointer;
}

.tree-select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37,99,235,0.1);
}

.tree-viewer {
    background: white;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 16px;
    max-height: 500px;
    overflow: auto;
    display: none;
}

.tree-stats {
    background: var(--bg);
    padding: 8px 10px;
    border-radius: 6px;
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 0.78em;
    color: var(--text-secondary);
    border: 1px solid var(--border);
    flex-wrap: wrap;
}

/* ── SVG Tree Graph Visualization ── */
.tree-svg-wrapper {
    overflow: hidden;
    position: relative;
    padding: 8px 0;
}

.tree-svg {
    display: block;
    min-width: 100%;
    font-family: var(--font);
}

.tree-view-btn {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 4px 10px;
    font-size: 0.78em;
    font-weight: 600;
    color: var(--primary);
    background: white;
    border: 1.5px solid var(--primary-subtle);
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s ease;
    margin-left: auto;
}

.tree-view-btn:hover {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

.tree-toolbar {
    display: flex;
    align-items: center;
    gap: 4px;
    margin-left: auto;
}

.tree-ctrl-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 26px;
    height: 26px;
    padding: 0;
    color: var(--text-secondary);
    background: white;
    border: 1.5px solid var(--border);
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.tree-ctrl-btn:hover {
    color: var(--primary);
    border-color: var(--primary-subtle);
    background: var(--primary-bg);
}

/* ── Force graph (Obsidian-style) ── */
.tree-force-graph {
    overflow: hidden;
    max-height: none;
    position: relative;
}

.tree-force-graph-modal {
    flex: 1;
    max-height: none;
    padding: 0;
}

.force-graph-tooltip {
    position: absolute;
    background: rgba(15, 23, 42, 0.9);
    color: white;
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 0.72em;
    pointer-events: none;
    white-space: nowrap;
    max-width: 280px;
    overflow: hidden;
    text-overflow: ellipsis;
    z-index: 20;
    backdrop-filter: blur(4px);
}

/* ── Panel stats view ── */
.tree-stats-panel {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.tree-stats-header {
    display: flex;
    align-items: center;
    gap: 8px;
}

.tree-stats-filename {
    font-size: 0.82em;
    font-weight: 600;
    color: var(--text);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.tree-stats-summary {
    display: flex;
    gap: 8px;
}

.tree-stat-chip {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 8px 4px;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 8px;
}

.tree-stat-chip-value {
    font-size: 1.2em;
    font-weight: 700;
    color: var(--text);
    line-height: 1;
}

.tree-stat-chip-label {
    font-size: 0.68em;
    color: var(--text-muted);
    margin-top: 2px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.tree-stats-breakdown {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.tree-stat-row {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 4px 8px;
    border-radius: 6px;
    background: var(--bg);
    font-size: 0.8em;
}

.tree-stat-type {
    color: var(--text-secondary);
    flex: 1;
    text-transform: capitalize;
}

.tree-stat-value {
    font-weight: 700;
    color: var(--text);
    font-size: 0.95em;
}

.tree-graph-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 10px 16px;
    font-size: 0.82em;
    font-weight: 600;
    color: var(--primary);
    background: var(--primary-bg);
    border: 1.5px solid var(--primary-subtle);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s ease;
    width: 100%;
}

.tree-graph-btn:hover {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

/* Legend */
.tree-legend {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}

.tree-legend-item {
    display: inline-flex;
    align-items: center;
    gap: 3px;
    font-size: 0.78em;
    color: var(--text-secondary);
}

.tree-legend-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    display: inline-block;
    flex-shrink: 0;
}

.tree-legend-count {
    color: var(--text-muted);
    font-size: 0.9em;
}

.tree-modal-legend {
    gap: 10px;
    padding: 4px 10px;
}

/* Modal graph body */
.tree-modal-graph-body {
    padding: 0;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.tree-empty { text-align: center; color: var(--text-muted); padding: 28px; font-size: 0.88em; }

/* Node detail popup */
.tree-detail-popup {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: white;
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    padding: 18px;
    max-width: 360px;
    width: 90%;
    z-index: 50;
    animation: detailPopIn 0.2s ease-out;
}

@keyframes detailPopIn {
    from { opacity: 0; transform: translate(-50%, -50%) scale(0.95); }
    to { opacity: 1; transform: translate(-50%, -50%) scale(1); }
}

.tree-detail-close {
    position: absolute;
    top: 8px;
    right: 12px;
    font-size: 18px;
    cursor: pointer;
    color: var(--text-muted);
    line-height: 1;
}

.tree-detail-close:hover { color: var(--text); }

.tree-detail-type {
    font-size: 0.72em;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 10px;
}

.tree-detail-section { margin-bottom: 10px; }
.tree-detail-label {
    font-size: 0.7em;
    font-weight: 700;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 3px;
}
.tree-detail-text {
    font-size: 0.84em;
    color: var(--text);
    line-height: 1.5;
    max-height: 120px;
    overflow-y: auto;
}

.tree-detail-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.tree-detail-tag {
    display: inline-block;
    padding: 3px 8px;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 12px;
    font-size: 0.72em;
    color: var(--text-secondary);
    font-weight: 600;
}

/* Index view tabs */
.index-view-tabs {
    display: flex;
    gap: 4px;
    padding: 4px;
    background: var(--bg);
    border-radius: 10px;
    margin-bottom: 10px;
    border: 1px solid var(--border);
}

.index-tab {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 5px;
    padding: 7px 10px;
    border: none;
    background: transparent;
    border-radius: 7px;
    font-size: 0.78em;
    font-weight: 600;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s ease;
    white-space: nowrap;
}

.index-tab:hover:not(.disabled) { background: white; color: var(--text); }
.index-tab.active { background: white; color: var(--primary); box-shadow: 0 1px 3px rgba(0,0,0,0.08); }
.index-tab.disabled { opacity: 0.4; cursor: not-allowed; }
.index-tab svg { flex-shrink: 0; }

/* Hyperedge view */
.hyperedge-container {
    display: flex;
    flex-direction: column;
    gap: 14px;
    max-height: 500px;
    overflow-y: auto;
    padding: 4px;
}

.hyperedge-section {
    background: white;
    border: 1px solid var(--border);
    border-radius: 10px;
    overflow: hidden;
}

.hyperedge-section-header {
    padding: 10px 14px;
    background: linear-gradient(135deg, #f8fafc, #f1f5f9);
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
}

.hyperedge-section-title {
    font-weight: 700;
    font-size: 0.85em;
    color: var(--text);
    flex: 1;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.hyperedge-section-meta {
    font-size: 0.72em;
    color: var(--text-secondary);
    white-space: nowrap;
}

.hyperedge-group {
    padding: 10px 14px;
    border-left: 3px solid #6366f1;
    margin: 8px 10px;
    border-radius: 0 6px 6px 0;
    background: #fafbfc;
}

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

.hyperedge-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 2px 8px;
    border-radius: 10px;
    font-size: 0.7em;
    font-weight: 700;
    color: white;
    min-width: 28px;
}

.hyperedge-node-count {
    font-size: 0.72em;
    color: var(--text-secondary);
}

.hyperedge-summary {
    font-size: 0.78em;
    color: #475569;
    line-height: 1.5;
    margin-bottom: 8px;
    font-style: italic;
    padding: 6px 8px;
    background: white;
    border-radius: 6px;
    border: 1px solid #e2e8f0;
}

.hyperedge-nodes {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.hyperedge-node-chip {
    display: flex;
    align-items: baseline;
    gap: 6px;
    padding: 5px 8px;
    background: white;
    border: 1px solid #e2e8f0;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.15s ease;
}

.hyperedge-node-chip:hover {
    border-color: var(--primary);
    box-shadow: 0 1px 4px rgba(37,99,235,0.1);
}

.hyperedge-chip-type {
    font-size: 0.65em;
    font-weight: 700;
    text-transform: uppercase;
    flex-shrink: 0;
}

.hyperedge-chip-text {
    font-size: 0.75em;
    color: var(--text-secondary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.hyperedge-must-links {
    margin-top: 6px;
    display: flex;
    align-items: center;
    gap: 6px;
    flex-wrap: wrap;
}

.must-link-label {
    font-size: 0.68em;
    font-weight: 600;
    color: #94a3b8;
}

.must-link-chip {
    font-size: 0.68em;
    padding: 2px 7px;
    background: #ede9fe;
    color: #6d28d9;
    border-radius: 8px;
    font-weight: 500;
}

/* Cluster view */
.cluster-container {
    display: flex;
    flex-direction: column;
    gap: 10px;
    max-height: 500px;
    overflow-y: auto;
    padding: 4px;
}

.cluster-section {
    background: white;
    border: 1px solid var(--border);
    border-left: 3px solid #6366f1;
    border-radius: 0 8px 8px 0;
    padding: 10px 12px;
}

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

.cluster-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 2px 10px;
    border-radius: 10px;
    font-size: 0.72em;
    font-weight: 700;
    color: white;
}

.cluster-count {
    font-size: 0.72em;
    color: var(--text-secondary);
}

.cluster-nodes {
    display: flex;
    flex-direction: column;
    gap: 3px;
}

.cluster-node-chip {
    display: flex;
    align-items: baseline;
    gap: 6px;
    padding: 5px 8px;
    background: #f8fafc;
    border: 1px solid #e2e8f0;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.15s ease;
}

.cluster-node-chip:hover {
    border-color: var(--primary);
    background: white;
}

.cluster-chip-type {
    font-size: 0.65em;
    font-weight: 700;
    text-transform: uppercase;
    flex-shrink: 0;
}

.cluster-chip-text {
    font-size: 0.75em;
    color: var(--text-secondary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.cluster-constraints {
    background: #f8fafc;
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 10px 12px;
}

.cluster-constraint-title {
    font-size: 0.78em;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 6px;
}

.cluster-constraint-summary {
    display: flex;
    gap: 8px;
}

.constraint-badge {
    font-size: 0.7em;
    padding: 3px 8px;
    border-radius: 8px;
    font-weight: 600;
}

.constraint-badge.must-link { background: #dcfce7; color: #16a34a; }
.constraint-badge.cannot-link { background: #fee2e2; color: #dc2626; }

/* Semantic tree hierarchy */
.sem-tree-node { margin-bottom: 6px; }

.sem-tree-node-header {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 6px 10px;
    border-left: 3px solid #6366f1;
    background: white;
    border-radius: 0 6px 6px 0;
    border-top: 1px solid #f1f5f9;
    border-bottom: 1px solid #f1f5f9;
    border-right: 1px solid #f1f5f9;
}

.sem-tree-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 2px 8px;
    border-radius: 10px;
    font-size: 0.7em;
    font-weight: 700;
    color: white;
}

.sem-tree-children-count {
    font-size: 0.7em;
    color: var(--text-secondary);
}

.sem-tree-summary {
    font-size: 0.76em;
    color: #475569;
    line-height: 1.5;
    font-style: italic;
    padding: 4px 8px;
    margin: 4px 0;
}

.sem-tree-leaf-nodes {
    display: flex;
    flex-direction: column;
    gap: 3px;
    margin: 4px 0;
}

/* Full-screen tree modal */
.tree-modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.4);
    backdrop-filter: blur(4px);
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.25s ease;
}

.tree-modal-overlay.active { opacity: 1; }

.tree-modal {
    background: white;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    width: 92vw;
    height: 85vh;
    max-width: 1400px;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    animation: modalSlideUp 0.3s ease-out;
}

@keyframes modalSlideUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.tree-modal-header {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 14px 24px;
    border-bottom: 1px solid var(--border);
    background: var(--bg);
}

.tree-modal-header h3 {
    font-size: 1em;
    font-weight: 700;
    color: var(--text);
    white-space: nowrap;
}

/* Modal toolbar */
.tree-modal-toolbar {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-left: auto;
}

.tree-toolbar-group {
    display: flex;
    align-items: center;
    gap: 4px;
    background: white;
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 3px 4px;
}

.tree-toolbar-btn {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 5px 8px;
    font-size: 0.76em;
    font-weight: 600;
    color: var(--text-secondary);
    background: transparent;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: all 0.15s ease;
    white-space: nowrap;
}

.tree-toolbar-btn:hover {
    background: var(--primary-light);
    color: var(--primary);
}

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

.tree-zoom-label {
    font-size: 0.74em;
    font-weight: 700;
    color: var(--text);
    min-width: 38px;
    text-align: center;
    user-select: none;
}

.tree-toolbar-divider {
    width: 1px;
    height: 24px;
    background: var(--border);
    margin: 0 2px;
}

.tree-modal-close {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    background: none;
    border: 1px solid var(--border);
    border-radius: 8px;
    cursor: pointer;
    color: var(--text-muted);
    transition: all 0.15s ease;
}

.tree-modal-close:hover {
    background: var(--error-bg);
    color: var(--error);
    border-color: var(--error);
}

.tree-modal-body {
    flex: 1;
    overflow: auto;
    padding: 16px;
    position: relative;
}

/* ── RAG Chat ── */
.chat-header-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 14px;
}

.chat-scope-bar {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 14px;
    background: white;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    margin-bottom: 14px;
    font-size: 0.86em;
    flex-wrap: wrap;
}

.chat-scope-label { color: var(--text-muted); font-weight: 600; white-space: nowrap; }
.chat-scope-options { display: flex; gap: 6px; flex-wrap: wrap; }

.scope-chip {
    padding: 4px 14px;
    border-radius: 20px;
    border: 1px solid var(--border);
    background: white;
    color: var(--text-muted);
    font-size: 0.83em;
    cursor: pointer;
    transition: all 0.15s;
    font-weight: 500;
}

.scope-chip:hover { border-color: var(--primary); color: var(--primary); }
.scope-chip.active { background: var(--primary); border-color: var(--primary); color: white; }

.chat-messages {
    min-height: 300px;
    max-height: 440px;
    overflow-y: auto;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 16px;
    background: var(--bg);
    display: flex;
    flex-direction: column;
    gap: 14px;
    margin-bottom: 12px;
}

.chat-empty {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    min-height: 180px;
    color: var(--text-muted);
    text-align: center;
    gap: 12px;
}

.chat-empty-icon { color: var(--text-muted); }
.chat-empty-text { font-size: 0.86em; line-height: 1.6; }

.chat-message { display: flex; gap: 10px; animation: fadeInUp 0.2s ease; }

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(4px); }
    to { opacity: 1; transform: translateY(0); }
}

.chat-message.user { flex-direction: row-reverse; }

.chat-avatar {
    width: 30px; height: 30px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75em;
    flex-shrink: 0;
    font-weight: 700;
}

.chat-message.user .chat-avatar { background: var(--primary); color: white; }
.chat-message.assistant .chat-avatar { background: var(--bg-alt); color: var(--text-secondary); }

.chat-bubble {
    max-width: 75%;
    padding: 10px 14px;
    border-radius: 12px;
    font-size: 0.9em;
    line-height: 1.6;
}

.chat-message.user .chat-bubble {
    background: var(--primary);
    color: white;
    border-bottom-right-radius: 4px;
}

.chat-message.assistant .chat-bubble {
    background: white;
    color: var(--text);
    border: 1px solid var(--border);
    border-bottom-left-radius: 4px;
}

.chat-sources { margin-top: 8px; padding-top: 8px; border-top: 1px solid var(--border); }
.chat-sources-title { font-size: 0.73em; color: var(--text-muted); font-weight: 700; text-transform: uppercase; letter-spacing: 0.5px; margin-bottom: 5px; }
.chat-source-item { font-size: 0.78em; color: var(--text-secondary); padding: 5px 8px; background: var(--bg); border-radius: 4px; margin-bottom: 3px; border-left: 2px solid var(--primary); }
.chat-source-filename { font-weight: 600; color: var(--text); margin-bottom: 2px; }
.chat-source-excerpt { color: var(--text-muted); font-style: italic; line-height: 1.4; }

.chat-input-row { display: flex; gap: 8px; align-items: flex-end; }
.chat-input-wrapper { flex: 1; }

.chat-input {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 0.9em;
    font-family: inherit;
    resize: none;
    min-height: 44px;
    max-height: 110px;
    line-height: 1.5;
    transition: border-color var(--transition), box-shadow var(--transition);
    background: white;
}

.chat-input:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px rgba(37,99,235,0.1); }

.chat-send-btn {
    padding: 10px 16px;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: var(--radius);
    cursor: pointer;
    font-size: 0.9em;
    font-weight: 600;
    height: 44px;
    transition: background var(--transition);
    white-space: nowrap;
    display: flex;
    align-items: center;
    justify-content: center;
}

.chat-send-btn:hover:not(:disabled) { background: var(--primary-dark); }
.chat-send-btn:disabled { background: var(--text-muted); cursor: not-allowed; }

.chat-clear-btn {
    padding: 5px 12px;
    background: transparent;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 0.78em;
    color: var(--text-muted);
    cursor: pointer;
    transition: all 0.15s;
    font-weight: 500;
}

.chat-clear-btn:hover { border-color: #fca5a5; color: var(--error); }

.chat-thinking { display: flex; gap: 4px; align-items: center; padding: 4px 0; }

.chat-thinking span {
    width: 6px; height: 6px;
    background: var(--text-muted);
    border-radius: 50%;
    animation: bounce 1.2s infinite;
}

.chat-thinking span:nth-child(2) { animation-delay: 0.2s; }
.chat-thinking span:nth-child(3) { animation-delay: 0.4s; }

@keyframes bounce {
    0%, 80%, 100% { transform: translateY(0); }
    40% { transform: translateY(-5px); }
}

/* ── Sync indicator ── */
.sync-indicator {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background: white;
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 7px 14px;
    font-size: 0.78em;
    color: var(--text-muted);
    box-shadow: var(--shadow);
    display: flex;
    align-items: center;
    gap: 7px;
    opacity: 0;
    transition: opacity 0.3s;
    z-index: 50;
}

.sync-indicator.show { opacity: 1; }

.sync-dot {
    width: 7px; height: 7px;
    background: var(--success);
    border-radius: 50%;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.35; }
}

/* ── Footer ── */
footer {
    background: var(--text);
    color: var(--text-muted);
    padding: 48px 24px;
}

.footer-inner {
    max-width: var(--max-width);
    margin: 0 auto;
    text-align: center;
}

.footer-brand {
    font-size: 1.1em;
    font-weight: 700;
    color: white;
    margin-bottom: 8px;
}

.footer-desc {
    font-size: 0.88em;
    line-height: 1.7;
    max-width: 600px;
    margin: 0 auto;
}

.footer-divider {
    border: none;
    border-top: 1px solid #334155;
    margin: 28px 0;
}

.footer-bottom p {
    font-size: 0.83em;
    line-height: 1.7;
}

.footer-bottom strong {
    color: #e2e8f0;
}

footer a {
    color: #60a5fa;
    text-decoration: none;
}

footer a:hover { text-decoration: underline; }

/* ── Active Nav Link ── */
.nav-links a.active {
    color: var(--primary);
    background: var(--primary-light);
}

/* ── Subpage Hero ── */
.subpage-hero {
    background: linear-gradient(180deg, var(--primary-light) 0%, var(--white) 100%);
    border-bottom: 1px solid var(--border);
    padding: 100px 24px 56px;
}

.subpage-title {
    font-size: 2.2em;
    font-weight: 800;
    color: var(--text);
    letter-spacing: -1px;
    line-height: 1.2;
    margin-bottom: 14px;
}

.subpage-desc {
    font-size: 1.05em;
    color: var(--text-secondary);
    line-height: 1.75;
    max-width: 680px;
}

/* ── Landing Grid (index.html cards) ── */
.landing-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.landing-card {
    background: white;
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 28px 24px;
    text-decoration: none;
    color: inherit;
    transition: box-shadow var(--transition), transform var(--transition);
    display: flex;
    flex-direction: column;
}

.landing-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-3px);
}

.landing-card h3 {
    font-size: 1.05em;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 8px;
}

.landing-card p {
    font-size: 0.88em;
    color: var(--text-secondary);
    line-height: 1.6;
    flex: 1;
}

.landing-card-link {
    font-size: 0.88em;
    font-weight: 600;
    color: var(--primary);
    margin-top: 14px;
}

.landing-card:hover .landing-card-link {
    text-decoration: underline;
}

/* ── Video Highlights ── */
.video-highlights {
    margin-top: 48px;
}

.video-highlights h3 {
    font-size: 1.1em;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 20px;
}

.highlight-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
}

.highlight-item {
    display: flex;
    gap: 14px;
    padding: 18px 20px;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
}

.highlight-num {
    flex-shrink: 0;
    width: 32px;
    height: 32px;
    background: var(--primary);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.82em;
    font-weight: 700;
}

.highlight-item strong {
    font-size: 0.92em;
    color: var(--text);
    display: block;
    margin-bottom: 4px;
}

.highlight-item p {
    font-size: 0.85em;
    color: var(--text-secondary);
    line-height: 1.55;
}

/* ── Guide Detail Box ── */
.guide-detail-box {
    margin-top: 10px;
    padding: 14px 16px;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 0.88em;
    color: var(--text-secondary);
    line-height: 1.65;
}

.guide-detail-box strong {
    color: var(--text);
}

.guide-detail-box ul {
    margin: 6px 0 0 18px;
    padding: 0;
}

.guide-detail-box li {
    margin-bottom: 4px;
}

.guide-step-content a {
    color: var(--primary);
    text-decoration: none;
    font-weight: 500;
}

.guide-step-content a:hover {
    text-decoration: underline;
}

/* ── Settings Guide Grid ── */
.settings-guide-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    max-width: 680px;
}

.settings-guide-item {
    background: white;
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 24px;
}

.settings-guide-item h4 {
    font-size: 0.95em;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 8px;
}

.settings-guide-item p {
    font-size: 0.88em;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ── Figure Gallery (index page) ── */
.figure-gallery {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.figure-card {
    background: white;
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: box-shadow var(--transition), transform var(--transition);
}

.figure-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-3px);
}

.figure-placeholder {
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 48px 24px;
    color: var(--text-muted);
    gap: 12px;
    min-height: 200px;
}

.figure-placeholder.large {
    padding: 80px 24px;
    min-height: 300px;
    border: 2px dashed var(--border);
    border-radius: var(--radius-xl);
    background: var(--bg);
}

.figure-placeholder p {
    font-size: 0.95em;
    font-weight: 600;
}

.figure-placeholder-hint {
    font-size: 0.78em;
    color: var(--text-muted);
    opacity: 0.7;
}

.figure-caption {
    padding: 16px 20px;
}

.figure-caption h4 {
    font-size: 0.95em;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 4px;
}

.figure-caption p {
    font-size: 0.85em;
    color: var(--text-secondary);
    line-height: 1.5;
}

.figure img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 14px; /* optional */
}

/* ── Architecture Page ── */
.arch-figure-wrapper {
    max-width: 900px;
    margin: 0 auto;
}

.arch-stack-centered {
    max-width: 600px;
    margin: 0 auto;
}

/* ── Interactive Examples ── */
.example-tabs {
    display: flex;
    gap: 8px;
    margin-bottom: 32px;
    flex-wrap: wrap;
}

.example-tab {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    background: white;
    border: 1px solid var(--border);
    border-radius: 100px;
    font-size: 0.88em;
    font-weight: 600;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition);
    font-family: var(--font);
}

.example-tab:hover {
    border-color: var(--primary);
    color: var(--primary);
}

.example-tab.active {
    background: var(--primary);
    border-color: var(--primary);
    color: white;
}

.example-tab-icon {
    display: flex;
    align-items: center;
}

.example-tab.active .example-tab-icon svg {
    stroke: white;
}

.example-panel {
    display: none;
}

.example-panel.active {
    display: block;
}

.example-scenario {
    margin-bottom: 32px;
}

.example-scenario-header h2 {
    font-size: 1.5em;
    font-weight: 800;
    color: var(--text);
    letter-spacing: -0.5px;
    margin-top: 8px;
    margin-bottom: 8px;
}

.example-scenario-desc {
    font-size: 0.95em;
    color: var(--text-secondary);
    line-height: 1.7;
    max-width: 700px;
}

.example-flow {
    display: flex;
    flex-direction: column;
    gap: 0;
}

.example-flow-step {
    background: white;
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 28px;
}

.example-flow-badge {
    display: inline-block;
    padding: 3px 12px;
    background: var(--primary-light);
    color: var(--primary);
    border-radius: 20px;
    font-size: 0.75em;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 10px;
}

.example-flow-step h3 {
    font-size: 1.1em;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 16px;
}

.example-flow-arrow {
    display: flex;
    justify-content: center;
    padding: 8px 0;
    color: var(--text-muted);
}

/* Mock Input */
.example-input-mock {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 16px;
}

.example-input-label {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.78em;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-muted);
    margin-bottom: 8px;
}

.example-input-text {
    font-size: 0.95em;
    color: var(--text);
    font-style: italic;
    line-height: 1.6;
    padding: 10px 14px;
    background: white;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    margin-bottom: 12px;
}

.example-input-btn {
    display: inline-block;
    padding: 8px 20px;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: var(--radius);
    font-size: 0.85em;
    font-weight: 600;
    cursor: default;
    font-family: var(--font);
}

/* Mock Results */
.example-results-mock {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.example-results-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
}

.example-result-card {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 16px;
    text-align: center;
}

.example-result-card-icon {
    display: flex;
    justify-content: center;
    margin-bottom: 8px;
    color: var(--text-muted);
}

.example-result-card.tree .example-result-card-icon { color: var(--primary); }
.example-result-card.hyperedge .example-result-card-icon { color: var(--accent); }
.example-result-card.combined .example-result-card-icon { color: #7c3aed; }

.example-result-card-label {
    font-size: 0.78em;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.3px;
    margin-bottom: 4px;
}

.example-result-card-value {
    font-size: 1.5em;
    font-weight: 800;
    color: var(--text);
    letter-spacing: -0.5px;
}

.example-result-card-sub {
    font-size: 0.78em;
    color: var(--text-muted);
}

.example-doc-list {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.example-doc-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 14px;
    border-radius: var(--radius);
    font-size: 0.9em;
    background: white;
    border: 1px solid var(--border-light);
}

.example-doc-item.match {
    border-left: 3px solid var(--success);
}

.example-doc-item.no-match {
    opacity: 0.5;
}

.example-doc-item.collapsed {
    border: none;
    background: transparent;
    justify-content: center;
    font-size: 0.82em;
    color: var(--text-muted);
    font-weight: 500;
}

.example-doc-name {
    font-weight: 600;
    color: var(--text);
    font-family: 'SF Mono', 'Fira Code', monospace;
    font-size: 0.88em;
}

.example-doc-badges {
    display: flex;
    gap: 4px;
}

.example-strat-badge {
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 0.72em;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.3px;
}

.example-strat-badge.tree-yes { background: #dbeafe; color: var(--primary); }
.example-strat-badge.tree-no { background: var(--bg); color: var(--text-muted); }
.example-strat-badge.hyper-yes { background: #cffafe; color: #0e7490; }
.example-strat-badge.hyper-no { background: var(--bg); color: var(--text-muted); }
.example-strat-badge.combined-yes { background: #ede9fe; color: #7c3aed; }
.example-strat-badge.combined-no { background: var(--bg); color: var(--text-muted); }

.example-insight {
    margin-top: 16px;
    padding: 14px 16px;
    background: #fef3c7;
    border: 1px solid #fbbf24;
    border-radius: var(--radius);
    font-size: 0.88em;
    color: #92400e;
    line-height: 1.6;
}

.example-insight strong {
    color: #78350f;
}

/* Mock Chat */
.example-chat-mock {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.example-chat-scope {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 10px 16px;
    background: white;
    border-bottom: 1px solid var(--border);
    font-size: 0.82em;
    color: var(--text-secondary);
}

.example-chat-messages {
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.example-chat-messages .chat-preview-bubble.assistant ul {
    margin: 8px 0 4px 16px;
    font-size: 0.95em;
}

.example-chat-messages .chat-preview-bubble.assistant li {
    margin-bottom: 4px;
    line-height: 1.5;
}

/* ── Chat Preview (examples page) ── */
.example-chat-preview {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.chat-preview-msg {
    display: flex;
}

.chat-preview-msg.user {
    justify-content: flex-end;
}

.chat-preview-bubble {
    max-width: 85%;
    padding: 10px 14px;
    border-radius: 12px;
    font-size: 0.88em;
    line-height: 1.6;
}

.chat-preview-bubble.user {
    background: var(--primary);
    color: white;
    border-bottom-right-radius: 4px;
}

.chat-preview-bubble.assistant {
    background: white;
    color: var(--text);
    border: 1px solid var(--border);
    border-bottom-left-radius: 4px;
}

.chat-preview-sources {
    margin-top: 10px;
    padding-top: 8px;
    border-top: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.chat-preview-source {
    font-size: 0.78em;
    color: var(--text-muted);
    padding: 4px 8px;
    background: var(--bg);
    border-radius: 4px;
    border-left: 2px solid var(--primary);
}

/* ── Video Section ── */
.video-wrapper {
    max-width: 800px;
    margin: 0 auto;
}

.video-placeholder {
    background: var(--bg);
    border: 2px dashed var(--border);
    border-radius: var(--radius-xl);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 80px 24px;
    color: var(--text-muted);
    gap: 16px;
    aspect-ratio: 16 / 9;
}

.video-placeholder p {
    font-size: 1em;
    font-weight: 600;
}

.video-placeholder iframe {
    width: 100%;
    height: 100%;
    border: none;
    border-radius: var(--radius-lg);
}

/* ── User Guide Steps ── */
.guide-steps {
    max-width: 780px;
    display: flex;
    flex-direction: column;
    gap: 0;
}

.guide-step {
    display: flex;
    gap: 24px;
    position: relative;
    padding-bottom: 32px;
}

.guide-step:last-child { padding-bottom: 0; }

.guide-step:not(:last-child)::before {
    content: '';
    position: absolute;
    left: 23px;
    top: 52px;
    bottom: 0;
    width: 2px;
    background: var(--border);
}

.guide-step-number {
    flex-shrink: 0;
    width: 48px;
    height: 48px;
    background: var(--primary);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1em;
    font-weight: 800;
    border: 3px solid white;
    box-shadow: 0 0 0 2px var(--primary);
    z-index: 1;
}

.guide-step-content h3 {
    font-size: 1.05em;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 6px;
    margin-top: 4px;
}

.guide-step-content p {
    font-size: 0.92em;
    color: var(--text-secondary);
    line-height: 1.7;
}

.guide-step-content em {
    background: var(--primary-light);
    padding: 1px 6px;
    border-radius: 4px;
    font-style: normal;
    color: var(--primary);
    font-weight: 500;
}

/* ── Examples Section ── */
.examples-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.example-card {
    background: white;
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 28px 24px;
    transition: box-shadow var(--transition), transform var(--transition);
}

.example-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-3px);
}

.example-tag {
    display: inline-block;
    padding: 3px 10px;
    background: var(--primary-light);
    color: var(--primary);
    border-radius: 20px;
    font-size: 0.75em;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 12px;
}

.example-card h3 {
    font-size: 1em;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 14px;
}

.example-query {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 12px 14px;
    margin-bottom: 12px;
}

.example-query-label {
    font-size: 0.7em;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-muted);
    margin-bottom: 4px;
}

.example-query-text {
    font-size: 0.88em;
    color: var(--text);
    font-style: italic;
    line-height: 1.5;
}

.example-result {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    margin-bottom: 12px;
}

.example-result-badge {
    padding: 3px 10px;
    border-radius: 4px;
    font-size: 0.78em;
    font-weight: 600;
}

.example-result-badge.match {
    background: var(--success-bg);
    color: var(--success);
    border: 1px solid #a7f3d0;
}

.example-result-badge.total {
    background: var(--bg);
    color: var(--text-muted);
    border: 1px solid var(--border);
}

.example-desc {
    font-size: 0.85em;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ── Two-Column Demo Layout ── */
.demo-page {
    background: var(--bg);
}

/* ── Old two-column layout (kept for backward compat) ── */
.demo-layout {
    display: grid;
    grid-template-columns: 480px 1fr;
    gap: 0;
    min-height: calc(100vh - 60px);
    margin-top: 60px;
}

.demo-left {
    background: white;
    border-right: 1px solid var(--border);
    padding: 20px;
    overflow-y: auto;
    height: calc(100vh - 60px);
    position: sticky;
    top: 60px;
}

.demo-left-header {
    padding: 12px 0 20px;
    border-bottom: 1px solid var(--border);
    margin-bottom: 16px;
}

.demo-left-header h2 {
    font-size: 1.15em;
    font-weight: 800;
    color: var(--text);
    letter-spacing: -0.3px;
}

.demo-left-header p {
    font-size: 0.83em;
    color: var(--text-muted);
    margin-top: 2px;
}

.demo-left .demo-step-card {
    background: var(--bg);
    margin-bottom: 12px;
}

.demo-left .upload-area {
    padding: 24px 16px;
}

.demo-left .tree-viewer {
    max-height: 500px;
}

.demo-left .settings-panel {
    margin-bottom: 12px;
}

.demo-left .settings-content {
    grid-template-columns: 1fr;
}

.demo-right {
    padding: 20px 28px;
    overflow-y: auto;
    height: calc(100vh - 60px);
}

.demo-right .demo-step-card {
    margin-bottom: 16px;
}

.demo-chat-card {
    display: flex;
    flex-direction: column;
    min-height: 0;
}

.demo-chat-card .chat-messages {
    flex: 1;
    min-height: 320px;
    max-height: none;
}

/* ================================================================
   V2 Three-Column Layout
   ================================================================ */
.demo-layout-v2 {
    display: grid;
    grid-template-columns: 420px 1fr 380px;
    gap: 0;
    min-height: calc(100vh - 60px);
    margin-top: 60px;
}

/* ── Left Panel ── */
.panel-left {
    background: white;
    border-right: 1px solid var(--border);
    padding: 16px;
    overflow-y: auto;
    height: calc(100vh - 60px);
    position: sticky;
    top: 60px;
}

.panel-left-header {
    padding: 8px 0 14px;
    border-bottom: 1px solid var(--border);
    margin-bottom: 12px;
}

.panel-left-header h2 {
    font-size: 1.05em;
    font-weight: 800;
    color: var(--text);
    letter-spacing: -0.3px;
}

.panel-left-header p {
    font-size: 0.78em;
    color: var(--text-muted);
    margin-top: 2px;
}

.panel-card {
    background: var(--bg);
    border-radius: var(--radius-lg);
    padding: 14px;
    margin-bottom: 10px;
    border: 1px solid var(--border-light);
}

.panel-card-title {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.85em;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 10px;
}

.panel-left .settings-panel { margin-bottom: 10px; }
.panel-left .settings-content { grid-template-columns: 1fr; }
.panel-left .upload-area { padding: 18px 12px; }
.panel-left .tree-viewer { max-height: 400px; }

/* ── Center Panel (Conversation) ── */
.panel-center {
    display: flex;
    flex-direction: column;
    height: calc(100vh - 60px);
    overflow: hidden;
    background: var(--bg);
}

.conversation-container {
    display: flex;
    flex-direction: column;
    height: 100%;
}

.conversation-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 20px;
    background: white;
    border-bottom: 1px solid var(--border);
    flex-shrink: 0;
}

.conversation-title {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.92em;
    font-weight: 700;
    color: var(--text);
}

.conversation-title svg { color: var(--primary); }

.conversation-actions { display: flex; gap: 6px; }

.conv-action-btn {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: 5px 10px;
    background: white;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 0.75em;
    font-weight: 600;
    color: var(--text-secondary);
    cursor: pointer;
    font-family: var(--font);
    transition: all var(--transition);
}

.conv-action-btn:hover {
    border-color: var(--error);
    color: var(--error);
}

/* Conversation Messages */
.conversation-messages {
    flex: 1;
    overflow-y: auto;
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.conversation-welcome {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 60px 20px;
    flex: 1;
}

.welcome-icon {
    color: var(--text-muted);
    margin-bottom: 16px;
    opacity: 0.5;
}

.conversation-welcome h3 {
    font-size: 1.1em;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 6px;
}

.conversation-welcome p {
    font-size: 0.85em;
    color: var(--text-muted);
    margin-bottom: 20px;
}

.welcome-hints {
    display: flex;
    flex-direction: column;
    gap: 8px;
    max-width: 360px;
}

.welcome-hint {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 14px;
    background: white;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 0.82em;
    color: var(--text-secondary);
    text-align: left;
}

.hint-tag {
    flex-shrink: 0;
    padding: 2px 8px;
    background: var(--primary-light);
    color: var(--primary);
    border-radius: 4px;
    font-size: 0.78em;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Conversation message bubbles */
.conv-message {
    display: flex;
    gap: 10px;
    animation: fadeInUp 0.25s ease;
    max-width: 85%;
}

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

.conv-message.assistant {
    align-self: flex-start;
}

.conv-message.system {
    align-self: center;
    max-width: 95%;
}

.conv-avatar {
    flex-shrink: 0;
    width: 30px;
    height: 30px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.7em;
    font-weight: 700;
}

.conv-message.user .conv-avatar { background: var(--primary); color: white; }
.conv-message.assistant .conv-avatar { background: var(--bg-alt); color: var(--text-secondary); border: 1px solid var(--border); }
.conv-message.system .conv-avatar { background: #f0abfc; color: white; }

.conv-bubble {
    padding: 10px 14px;
    border-radius: var(--radius-lg);
    font-size: 0.88em;
    line-height: 1.6;
    max-width: 100%;
    word-break: break-word;
}

.conv-message.user .conv-bubble {
    background: var(--primary);
    color: white;
    border-bottom-right-radius: 4px;
}

.conv-message.assistant .conv-bubble {
    background: white;
    color: var(--text);
    border: 1px solid var(--border);
    border-bottom-left-radius: 4px;
}

.conv-message.system .conv-bubble {
    background: transparent;
    padding: 0;
    width: 100%;
}

/* ── Filter Result Card (inline in conversation) ── */
.conv-filter-result {
    background: white;
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 16px;
    width: 100%;
    animation: fadeInUp 0.3s ease;
}

.conv-filter-header {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 12px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--border-light);
}

.conv-filter-header svg { color: var(--primary); flex-shrink: 0; }

.conv-filter-header-text {
    font-size: 0.82em;
    font-weight: 700;
    color: var(--text);
}

.conv-filter-query {
    font-size: 0.78em;
    color: var(--text-secondary);
    font-style: italic;
    margin-left: auto;
    max-width: 200px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* Mini stat cards inside conversation */
.conv-stats-row {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 6px;
    margin-bottom: 12px;
}

.conv-stat-card {
    text-align: center;
    padding: 8px 4px;
    background: var(--bg);
    border-radius: var(--radius);
    border: 1px solid var(--border-light);
    transition: all 0.2s ease;
}

.conv-stat-card.match { background: var(--success-bg); border-color: #a7f3d0; }
.conv-stat-card.no-match { background: var(--bg); }

.conv-stat-value {
    font-size: 1.4em;
    font-weight: 800;
    color: var(--text);
    line-height: 1;
    margin-bottom: 2px;
}

.conv-stat-card.match .conv-stat-value { color: var(--success); }

.conv-stat-label {
    font-size: 0.68em;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.3px;
}

/* Per-doc breakdown in conversation */
.conv-doc-list {
    display: flex;
    flex-direction: column;
    gap: 4px;
    margin-bottom: 10px;
}

.conv-doc-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 6px 10px;
    border-radius: 6px;
    font-size: 0.78em;
    background: var(--bg);
    border: 1px solid transparent;
    transition: all 0.2s ease;
}

.conv-doc-item.matched {
    background: var(--success-bg);
    border-color: #bbf7d0;
}

.conv-doc-name {
    font-weight: 600;
    color: var(--text);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    max-width: 180px;
}

.conv-doc-badges {
    display: flex;
    gap: 4px;
}

.conv-badge {
    padding: 1px 6px;
    border-radius: 4px;
    font-size: 0.72em;
    font-weight: 700;
}

.conv-badge.pass { background: #e8f5e9; color: #2e7d32; }
.conv-badge.fail { background: #fce4ec; color: #c62828; }

/* ── Method comparison table ── */
.conv-method-table {
    margin-bottom: 14px;
    border: 1px solid var(--border-light);
    border-radius: 8px;
    overflow: hidden;
    font-size: 0.78em;
}

.conv-method-table-head {
    display: grid;
    grid-template-columns: 100px 56px 1fr 72px;
    gap: 0;
    padding: 5px 10px;
    background: var(--bg-alt);
    border-bottom: 1px solid var(--border-light);
    font-size: 0.72em;
    font-weight: 700;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.4px;
}

.conv-method-row {
    display: grid;
    grid-template-columns: 100px 56px 1fr 72px;
    gap: 0;
    align-items: center;
    padding: 6px 10px;
    border-bottom: 1px solid var(--border-light);
    transition: background 0.15s;
}
.conv-method-row:last-child { border-bottom: none; }
.conv-method-row.has-match { background: #f0fdf4; }

.conv-method-name {
    display: flex;
    align-items: center;
    gap: 6px;
    font-weight: 600;
    color: var(--text);
}
.conv-method-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    flex-shrink: 0;
}
.conv-method-matched {
    font-weight: 800;
    color: var(--text);
}
.conv-method-total {
    font-weight: 400;
    color: var(--text-muted);
}
.conv-method-recall {
    display: flex;
    align-items: center;
    gap: 6px;
}
.conv-recall-bar-wrap {
    flex: 1;
    height: 10px;
    background: var(--bg-alt);
    border-radius: 3px;
    overflow: hidden;
    min-width: 30px;
}
.conv-recall-bar-fill {
    display: block;
    height: 100%;
    transition: width 0.7s cubic-bezier(0.4, 0, 0.2, 1);
}
.conv-recall-pct {
    font-size: 0.85em;
    font-weight: 700;
    color: var(--text-secondary);
    width: 28px;
    text-align: right;
    flex-shrink: 0;
}
.conv-method-tokens {
    font-family: 'SF Mono', 'Fira Code', monospace;
    font-size: 0.88em;
    font-weight: 600;
    color: var(--text-secondary);
    text-align: right;
}

/* ── Token cost vertical bar chart ── */
.conv-token-chart {
    margin-bottom: 14px;
    padding: 10px 12px 8px;
    border: 1px solid var(--border-light);
    border-radius: 8px;
    background: var(--bg);
}
.conv-chart-title {
    font-size: 0.72em;
    font-weight: 700;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.4px;
    margin-bottom: 10px;
}
.conv-chart-body {
    display: flex;
    gap: 6px;
    align-items: flex-end;
}
.conv-chart-yaxis {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    height: 100px;
    text-align: right;
    flex-shrink: 0;
    padding-bottom: 18px;
}
.conv-chart-yaxis span {
    font-size: 0.65em;
    color: var(--text-muted);
    font-family: 'SF Mono', 'Fira Code', monospace;
    line-height: 1;
}
.conv-chart-plot {
    flex: 1;
    position: relative;
    height: 118px;
}
.conv-chart-grid {
    position: absolute;
    inset: 0 0 18px 0;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    pointer-events: none;
}
.conv-chart-gridline {
    width: 100%;
    height: 1px;
    background: var(--border-light);
}
.conv-chart-bars {
    position: absolute;
    inset: 0 0 18px 0;
    display: flex;
    align-items: flex-end;
    gap: 8px;
    padding: 0 4px;
}
.conv-chart-col {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    height: 100%;
}
.conv-chart-bar-wrap {
    flex: 1;
    width: 100%;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    align-items: center;
    gap: 3px;
}
.conv-bar-value {
    font-size: 0.62em;
    font-weight: 700;
    color: var(--text-secondary);
    white-space: nowrap;
}
.conv-chart-bar {
    width: 100%;
    border-radius: 4px 4px 0 0;
    transition: height 0.8s cubic-bezier(0.4, 0, 0.2, 1);
    min-height: 2px;
}
.conv-chart-bar-label {
    position: absolute;
    bottom: 0;
    height: 18px;
    display: flex;
    align-items: center;
    font-size: 0.66em;
    font-weight: 700;
    white-space: nowrap;
}
.conv-chart-col { position: relative; }

/* Per-doc section */
.conv-doc-section {
    margin-top: 2px;
}

/* Section title shared */
.conv-dist-title {
    font-size: 0.72em;
    font-weight: 700;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.4px;
    margin-bottom: 6px;
}

/* Index construction tokens section */
.index-tokens-section {
    margin-top: 10px;
    padding-top: 10px;
    border-top: 1px solid var(--border);
}
.index-tokens-title {
    font-size: 0.72em;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 6px;
}

/* Sources in conversation */
.conv-sources {
    margin-top: 8px;
    padding-top: 8px;
    border-top: 1px solid var(--border-light);
}

.conv-sources-title {
    font-size: 0.7em;
    font-weight: 700;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 4px;
}

.conv-source-item {
    font-size: 0.76em;
    color: var(--text-secondary);
    padding: 4px 8px;
    background: var(--bg);
    border-radius: 4px;
    margin-bottom: 3px;
    border-left: 2px solid var(--primary);
}

.conv-source-filename { font-weight: 600; color: var(--text); margin-bottom: 1px; }
.conv-source-excerpt { color: var(--text-muted); font-style: italic; line-height: 1.4; }

/* Thinking indicator */
.conv-thinking {
    display: flex;
    gap: 4px;
    align-items: center;
    padding: 4px 0;
}

.conv-thinking span {
    width: 6px;
    height: 6px;
    background: var(--text-muted);
    border-radius: 50%;
    animation: thinkPulse 1.4s infinite ease-in-out;
}

.conv-thinking span:nth-child(2) { animation-delay: 0.2s; }
.conv-thinking span:nth-child(3) { animation-delay: 0.4s; }

@keyframes thinkPulse {
    0%, 80%, 100% { transform: scale(0.6); opacity: 0.4; }
    40% { transform: scale(1); opacity: 1; }
}

/* ── Conversation Input Area ── */
.conversation-input-area {
    flex-shrink: 0;
    background: white;
    border-top: 1px solid var(--border);
    padding: 10px 20px 14px;
}

.input-mode-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 8px;
}

.input-mode-tabs {
    display: flex;
    gap: 2px;
    background: var(--bg);
    padding: 2px;
    border-radius: 6px;
}

.input-mode-tab {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: 5px 12px;
    border: none;
    background: transparent;
    border-radius: 5px;
    font-size: 0.76em;
    font-weight: 600;
    color: var(--text-secondary);
    cursor: pointer;
    font-family: var(--font);
    transition: all var(--transition);
}

.input-mode-tab.active {
    background: white;
    color: var(--primary);
    box-shadow: var(--shadow-xs);
}

.input-mode-tab:hover:not(.active) { color: var(--text); }

.input-scope-bar {
    display: flex;
    align-items: center;
    gap: 6px;
}

.scope-label {
    font-size: 0.72em;
    font-weight: 600;
    color: var(--text-muted);
}

.scope-options { display: flex; gap: 4px; }

.scope-chip {
    padding: 3px 8px;
    font-size: 0.72em;
    font-weight: 600;
    border-radius: 4px;
    cursor: pointer;
    background: var(--bg);
    color: var(--text-muted);
    border: 1px solid transparent;
    transition: all var(--transition);
}

.scope-chip.active {
    background: var(--primary-light);
    color: var(--primary);
    border-color: var(--primary-subtle);
}

.scope-chip:hover:not(.active) { background: var(--bg-alt); color: var(--text-secondary); }

.input-row {
    display: flex;
    gap: 8px;
    align-items: flex-end;
}

.conv-input {
    flex: 1;
    padding: 10px 14px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 0.88em;
    font-family: var(--font);
    resize: none;
    overflow-y: auto;
    max-height: 100px;
    line-height: 1.5;
    transition: border-color var(--transition), box-shadow var(--transition);
}

.conv-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37,99,235,0.08);
}

.conv-input.filter-mode {
    border-color: #7c3aed;
}

.conv-input.filter-mode:focus {
    box-shadow: 0 0 0 3px rgba(124,58,237,0.08);
}

.conv-send-btn {
    flex-shrink: 0;
    width: 38px;
    height: 38px;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: background var(--transition);
}

.conv-send-btn:hover:not(:disabled) { background: var(--primary-dark); }
.conv-send-btn:disabled { background: var(--text-muted); cursor: not-allowed; }

.conv-send-btn.filter-mode { background: #7c3aed; }
.conv-send-btn.filter-mode:hover:not(:disabled) { background: #6d28d9; }

/* ── Right Panel ── */
.panel-right {
    background: white;
    border-left: 1px solid var(--border);
    padding: 16px;
    overflow-y: auto;
    height: calc(100vh - 60px);
    position: sticky;
    top: 60px;
}

.panel-right-header {
    padding: 4px 0 12px;
    border-bottom: 1px solid var(--border);
    margin-bottom: 12px;
}

.panel-right-header h3 {
    font-size: 0.92em;
    font-weight: 700;
    color: var(--text);
}

.right-section {
    margin-bottom: 16px;
}

.right-section-title {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.78em;
    font-weight: 700;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.3px;
    margin-bottom: 10px;
}

.right-section-title svg { color: var(--text-muted); }

/* Model select */
.model-select-row {
    margin-bottom: 10px;
}

.model-label {
    display: block;
    font-size: 0.75em;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 4px;
}

.model-select {
    width: 100%;
    padding: 7px 10px;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 0.82em;
    font-family: var(--font);
    color: var(--text);
    background: white;
    cursor: pointer;
}

.model-select:focus { outline: none; border-color: var(--primary); }

/* Session info */
.session-info {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
    padding: 10px 0;
    border-top: 1px solid var(--border-light);
}

.session-stat { text-align: center; }
.session-stat-label { display: block; font-size: 0.68em; color: var(--text-muted); font-weight: 600; text-transform: uppercase; letter-spacing: 0.3px; }
.session-stat-value { display: block; font-size: 1.2em; font-weight: 800; color: var(--text); }

/* Filter results panel in right column */
.filter-query-display {
    padding: 8px 10px;
    background: var(--bg);
    border-radius: 6px;
    font-size: 0.78em;
    color: var(--text-secondary);
    font-style: italic;
    margin-bottom: 10px;
    border-left: 3px solid var(--primary);
}

.result-mini-cards {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 5px;
    margin-bottom: 10px;
}

.result-mini-card {
    text-align: center;
    padding: 8px 4px;
    background: var(--bg);
    border-radius: 6px;
    border: 1px solid var(--border-light);
}

.result-mini-card.match { background: var(--success-bg); border-color: #a7f3d0; }

.mini-card-value {
    font-size: 1.2em;
    font-weight: 800;
    color: var(--text);
    line-height: 1;
}

.result-mini-card.match .mini-card-value { color: var(--success); }

.mini-card-label {
    font-size: 0.65em;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.3px;
    margin-top: 2px;
}

/* Right panel doc list */
.right-doc-list {
    display: flex;
    flex-direction: column;
    gap: 3px;
    margin-bottom: 10px;
    max-height: 200px;
    overflow-y: auto;
}

.right-doc-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 5px 8px;
    border-radius: 4px;
    font-size: 0.74em;
    background: var(--bg);
}

.right-doc-item.matched { background: var(--success-bg); }

.right-doc-name {
    font-weight: 600;
    color: var(--text);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    max-width: 120px;
}

.right-doc-badges { display: flex; gap: 3px; }

.right-badge {
    padding: 1px 5px;
    border-radius: 3px;
    font-size: 0.68em;
    font-weight: 700;
}

.right-badge.pass { background: #e8f5e9; color: #2e7d32; }
.right-badge.fail { background: #fce4ec; color: #c62828; }

/* Token usage bar */
.token-usage-bar {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 4px;
}

.token-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 4px;
    padding: 3px 6px;
    background: var(--bg);
    border-radius: 4px;
    border: 1px solid var(--border-light);
    padding: 3px 7px;
    background: var(--bg);
    border-radius: 4px;
    font-size: 0.68em;
}

.token-label { color: var(--text-muted); font-weight: 600; }
.token-value { color: var(--text-secondary); font-weight: 700; }

/* Filter history */
.filter-history-list {
    display: flex;
    flex-direction: column;
    gap: 4px;
    max-height: 300px;
    overflow-y: auto;
}

.filter-history-empty {
    font-size: 0.78em;
    color: var(--text-muted);
    text-align: center;
    padding: 12px;
}

.filter-history-item {
    padding: 8px 10px;
    background: var(--bg);
    border-radius: 6px;
    border: 1px solid var(--border-light);
    cursor: pointer;
    transition: all var(--transition);
}

.filter-history-item:hover {
    border-color: var(--primary-subtle);
    background: var(--primary-light);
}

.filter-history-item.active {
    border-color: var(--primary);
    background: var(--primary-light);
}

.filter-history-query {
    font-size: 0.76em;
    font-weight: 600;
    color: var(--text);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    margin-bottom: 2px;
}

.filter-history-meta {
    display: flex;
    gap: 8px;
    font-size: 0.66em;
    color: var(--text-muted);
}

.filter-history-meta .match-count {
    color: var(--success);
    font-weight: 700;
}

/* Demo page: sticky nav without the default section padding */
.demo-page nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
}

/* Demo page footer adjustments */
.demo-page footer {
    margin-top: 0;
}

/* ── Examples Page Animations ── */
.example-panel { display: none; }
.example-panel.active { display: block; animation: exampleFadeIn 0.5s ease; }

@keyframes exampleFadeIn {
    from { opacity: 0; transform: translateY(16px); }
    to { opacity: 1; transform: translateY(0); }
}

.example-flow-step {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}
.example-flow-step.visible {
    opacity: 1;
    transform: translateY(0);
}
.example-flow-step:nth-child(1) { transition-delay: 0s; }
.example-flow-step:nth-child(3) { transition-delay: 0.15s; }
.example-flow-step:nth-child(5) { transition-delay: 0.3s; }

.example-flow-arrow {
    opacity: 0;
    transition: opacity 0.4s ease 0.2s;
}
.example-flow-arrow.visible { opacity: 1; }

.example-input-text.typing {
    border-right: 2px solid var(--primary);
    animation: blink-caret 0.75s step-end infinite;
    overflow: hidden;
    white-space: nowrap;
}
@keyframes blink-caret {
    from, to { border-color: transparent; }
    50% { border-color: var(--primary); }
}

.example-result-card.animate-in {
    animation: resultPop 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
}
@keyframes resultPop {
    0% { transform: scale(0.8); opacity: 0; }
    100% { transform: scale(1); opacity: 1; }
}

.example-doc-item {
    opacity: 0;
    transform: translateX(-10px);
    transition: opacity 0.3s ease, transform 0.3s ease;
}
.example-doc-item.visible {
    opacity: 1;
    transform: translateX(0);
}
.example-doc-item.no-match.visible { opacity: 0.5; }

.example-insight {
    opacity: 0;
    transform: translateY(8px);
    transition: opacity 0.5s ease, transform 0.5s ease;
}
.example-insight.visible {
    opacity: 1;
    transform: translateY(0);
}

.chat-preview-msg {
    opacity: 0;
    transform: translateY(8px);
    transition: opacity 0.4s ease, transform 0.4s ease;
}
.chat-preview-msg.visible {
    opacity: 1;
    transform: translateY(0);
}

.example-doc-item.match:hover {
    background: var(--primary-light);
    border-color: var(--primary);
    transform: translateX(4px) !important;
    transition: all 0.2s ease;
}

.example-scenario-header {
    position: relative;
    padding-left: 20px;
}
.example-scenario-header::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 4px;
    background: linear-gradient(180deg, var(--primary), #7c3aed);
    border-radius: 4px;
}

.try-it-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 18px;
    background: linear-gradient(135deg, var(--primary), #7c3aed);
    color: white;
    border-radius: 20px;
    font-size: 0.82em;
    font-weight: 700;
    text-decoration: none;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    margin-top: 20px;
}
.try-it-badge:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(37,99,235,0.3);
}

.replay-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 14px;
    background: white;
    border: 1px solid var(--border);
    border-radius: 20px;
    font-size: 0.78em;
    font-weight: 600;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s ease;
    font-family: var(--font);
    margin-bottom: 16px;
}
.replay-btn:hover {
    border-color: var(--primary);
    color: var(--primary);
}

/* Example how-it-works strip */
.example-how-strip {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
    margin-bottom: 40px;
}

.example-how-item {
    display: flex;
    align-items: flex-start;
    gap: 14px;
    padding: 18px 20px;
    background: white;
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    transition: box-shadow var(--transition);
}

.example-how-item:hover {
    box-shadow: var(--shadow-sm);
}

.example-how-num {
    flex-shrink: 0;
    width: 32px;
    height: 32px;
    background: var(--primary);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.82em;
    font-weight: 700;
}

.example-how-text {
    flex: 1;
}

.example-how-text strong {
    display: block;
    font-size: 0.88em;
    color: var(--text);
    margin-bottom: 2px;
}

.example-how-text span {
    font-size: 0.82em;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* Example panel header bar */
.example-panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 24px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border);
}

/* ── Filter Input Row (inline) ── */
.filter-input-row {
    display: flex;
    gap: 10px;
    align-items: stretch;
}

.filter-input-row input[type="text"] {
    flex: 1;
    margin: 0;
}

.filter-input-row .btn {
    margin-top: 0;
    white-space: nowrap;
    flex-shrink: 0;
}

/* ── Filter Progress Overlay ── */
.filter-progress-overlay {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(15, 23, 42, 0.5);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 200;
    animation: overlayFadeIn 0.3s ease;
}

.filter-progress-overlay.show {
    display: flex;
}

@keyframes overlayFadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.filter-progress-card {
    background: white;
    border-radius: var(--radius-xl);
    padding: 32px 36px;
    box-shadow: var(--shadow-lg);
    min-width: 380px;
    max-width: 440px;
    animation: progressCardIn 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}

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

.filter-progress-title {
    font-size: 1.05em;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 24px;
    text-align: center;
}

.filter-progress-steps {
    display: flex;
    flex-direction: column;
    gap: 14px;
    margin-bottom: 24px;
}

.filter-progress-step {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 14px;
    border-radius: var(--radius);
    background: var(--bg);
    border: 1px solid var(--border);
    transition: all 0.3s ease;
    opacity: 0.5;
}

.filter-progress-step.active {
    opacity: 1;
    background: var(--primary-light);
    border-color: var(--primary-subtle);
}

.filter-progress-step.done {
    opacity: 1;
    background: var(--success-bg);
    border-color: #a7f3d0;
}

.fp-step-icon {
    color: var(--text-muted);
    display: flex;
    align-items: center;
    transition: color 0.3s ease;
}

.filter-progress-step.active .fp-step-icon { color: var(--primary); }
.filter-progress-step.done .fp-step-icon { color: var(--success); }

.fp-step-text {
    flex: 1;
    font-size: 0.88em;
    font-weight: 500;
    color: var(--text-secondary);
    transition: color 0.3s ease;
}

.filter-progress-step.active .fp-step-text { color: var(--text); font-weight: 600; }
.filter-progress-step.done .fp-step-text { color: var(--success); }

.fp-step-status {
    display: flex;
    align-items: center;
    min-width: 18px;
}

.fp-step-check {
    color: var(--success);
    font-weight: 700;
}

.filter-progress-bar {
    height: 4px;
    background: var(--border);
    border-radius: 4px;
    overflow: hidden;
}

.filter-progress-bar-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary), #7c3aed);
    border-radius: 4px;
    width: 0%;
    transition: width 0.6s ease;
}

/* ── Result card animations ── */
.result-item.animate-in {
    animation: resultCardPop 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
}

@keyframes resultCardPop {
    0% { transform: scale(0.85); opacity: 0; }
    100% { transform: scale(1); opacity: 1; }
}

.doc-result.animate-in {
    animation: docResultSlide 0.4s ease;
}

@keyframes docResultSlide {
    from { opacity: 0; transform: translateX(-12px); }
    to { opacity: 1; transform: translateX(0); }
}

/* ── Utility ── */
.hidden { display: none; }

/* ── Responsive ── */
@media (max-width: 1400px) {
    .demo-layout-v2 {
        grid-template-columns: 380px 1fr 340px;
    }
}
@media (max-width: 1200px) {
    .demo-layout-v2 {
        grid-template-columns: 340px 1fr 300px;
    }
}

@media (max-width: 1024px) {
    .demo-layout {
        grid-template-columns: 1fr;
    }
    .demo-left {
        position: static;
        height: auto;
        border-right: none;
        border-bottom: 1px solid var(--border);
    }
    .demo-right {
        height: auto;
    }
    .demo-layout-v2 {
        grid-template-columns: 1fr;
    }
    .panel-left, .panel-right {
        position: static;
        height: auto;
        border-right: none;
        border-left: none;
        border-bottom: 1px solid var(--border);
    }
    .panel-center {
        height: 60vh;
    }
}

@media (max-width: 768px) {
    .hero h1 { font-size: 1.85em; }
    .hero { padding: 56px 20px 48px; }
    .subpage-hero { padding: 80px 20px 40px; }
    .subpage-title { font-size: 1.6em; }
    .section { padding: 56px 20px; }
    .nav-links { display: none; }
    .nav-cta { display: none; }
    .overview-grid { grid-template-columns: 1fr; }
    .landing-grid { grid-template-columns: 1fr 1fr; }
    .arch-layout { grid-template-columns: 1fr; }
    .results-summary { grid-template-columns: 1fr; }
    .metrics-grid { grid-template-columns: 1fr; }
    .tier-tags { padding-left: 0; }
    .tier-header { flex-direction: column; }
    .examples-grid { grid-template-columns: 1fr; }
    .figure-gallery { grid-template-columns: 1fr; }
    .example-results-cards { grid-template-columns: 1fr; }
    .example-how-strip { grid-template-columns: 1fr; }
    .highlight-grid { grid-template-columns: 1fr; }
    .settings-guide-grid { grid-template-columns: 1fr; }
    .guide-step { gap: 16px; }
    .guide-step-number { width: 40px; height: 40px; font-size: 0.95em; }
}

@media (max-width: 480px) {
    .hero h1 { font-size: 1.5em; }
    .hero-abstract { font-size: 0.95em; }
    .subpage-title { font-size: 1.3em; }
    .section-title { font-size: 1.4em; }
    .demo-panel-body { padding: 16px; }
    .demo-step-card { padding: 16px; }
    .landing-grid { grid-template-columns: 1fr; }
}