/* ===== CSS Variables ===== */
:root {
    --primary: #1a73e8;
    --primary-dark: #1557b0;
    --primary-light: #e8f0fe;
    --accent: #34a853;
    --accent-dark: #2d8e47;
    --warning: #fbbc04;
    --danger: #ea4335;
    --bg: #f0f7ff;
    --card-bg: #ffffff;
    --text: #202124;
    --text-secondary: #5f6368;
    --text-light: #9aa0a6;
    --border: #dce8f5;
    --shadow: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
    --shadow-lg: 0 10px 40px rgba(0,0,0,0.08);
    --radius: 12px;
    --radius-sm: 8px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --nav-height: 64px;
}

/* ===== Reset & Base ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; height: 100%; }
body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    overflow-x: hidden;
    min-height: 100%;
}
a { text-decoration: none; color: inherit; }
ul { list-style: none; }
img { max-width: 100%; display: block; }

/* ===== Scrollbar ===== */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: #c1c7cd; border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: #a8adb4; }

/* ===== Navigation ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--nav-height);
    background: rgba(255,255,255,0.9);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 32px;
    transition: var(--transition);
}
.navbar.scrolled { background: rgba(255,255,255,0.97); }
.nav-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 1.2rem;
    color: var(--primary);
    cursor: pointer;
    user-select: none;
}
.nav-brand .logo-icon {
    width: 32px;
    height: 32px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 1rem;
    font-weight: 700;
}
.nav-links { display: flex; align-items: center; gap: 4px; }
.nav-links a {
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: var(--transition);
    position: relative;
    white-space: nowrap;
    cursor: pointer;
}
.nav-links a:hover,
.nav-links a.active { color: var(--primary); background: var(--primary-light); }
.nav-links a.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 20px;
    height: 3px;
    background: var(--primary);
    border-radius: 2px;
}
.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: 4px;
    background: none;
    border: none;
}
.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text);
    border-radius: 2px;
    transition: var(--transition);
}

/* ===== Section Container (Click Navigation) ===== */
.section-container {
    padding-top: var(--nav-height);
    position: relative;
}
.section-page {
    display: none;
    min-height: 100vh;
    width: 100%;
    padding: 40px 32px 60px;
    animation: fadeIn 0.4s ease-out;
}
.section-page.active { display: flex; flex-direction: column; align-items: center; }
.section-page .section-inner {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    flex: 1;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(12px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ===== Section Header ===== */
.section-header {
    text-align: center;
    margin-bottom: 40px;
}
.section-header h2 {
    font-size: 2rem;
    font-weight: 700;
    letter-spacing: -0.5px;
    margin-bottom: 12px;
}
.section-header p {
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
    font-size: 1.05rem;
}
.section-header .badge {
    display: inline-block;
    padding: 4px 16px;
    border-radius: 50px;
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 12px;
    background: var(--primary-light);
    color: var(--primary);
}

/* ================================================================
   HOME SECTION — Light blue theme with illustrations
   ================================================================ */
#sec-home {
    background: linear-gradient(180deg, #e8f4fd 0%, #f0f7ff 40%, #ffffff 100%);
    padding-top: 20px;
}

/* Hero area */
.home-hero {
    margin-bottom: 32px;
}
.home-hero-content {
    display: flex;
    align-items: center;
    gap: 48px;
}
.home-hero-text { flex: 1; }
.home-hero-text h1 {
    font-size: 3.2rem;
    font-weight: 800;
    letter-spacing: -1px;
    margin: 12px 0 8px;
    line-height: 1.1;
}
.home-subtitle {
    font-size: 1.2rem;
    color: var(--primary);
    font-weight: 600;
    margin-bottom: 12px;
}
.home-desc {
    font-size: 1rem;
    color: var(--text-secondary);
    line-height: 1.7;
    max-width: 540px;
    margin-bottom: 24px;
}
.home-actions {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}
.btn-outline-primary {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 28px;
    border-radius: 50px;
    font-weight: 600;
    font-size: 0.95rem;
    border: 2px solid var(--primary);
    cursor: pointer;
    transition: var(--transition);
    font-family: var(--font);
    background: transparent;
    color: var(--primary);
}
.btn-outline-primary:hover { background: var(--primary); color: #fff; }

/* Illustration */
.home-hero-visual { flex: 1; display: flex; justify-content: center; }
.home-illustration {
    width: 320px;
    height: 320px;
    position: relative;
    background: radial-gradient(circle at center, rgba(26,115,232,0.06) 0%, transparent 70%);
    border-radius: 50%;
}

/* DNA Helix */
.dna-helix {
    position: absolute;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    gap: 6px;
}
.dna-helix span {
    display: block;
    width: 80px;
    height: 4px;
    border-radius: 2px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    opacity: 0.7;
}
.dna-helix span:nth-child(odd) { transform: rotate(-8deg); }
.dna-helix span:nth-child(even) { transform: rotate(8deg); }

/* Cell Group */
.cell-group {
    position: absolute;
    bottom: 60px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 8px;
    align-items: flex-end;
}
.cell {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    border: 2px solid var(--primary);
    background: rgba(26,115,232,0.1);
    animation: pulse 3s ease-in-out infinite;
}
.cell.c1 { width: 28px; height: 28px; animation-delay: 0s; }
.cell.c2 { width: 36px; height: 36px; animation-delay: 0.3s; background: rgba(52,168,83,0.15); border-color: var(--accent); }
.cell.c3 { width: 42px; height: 42px; animation-delay: 0.6s; background: rgba(26,115,232,0.12); }
.cell.c4 { width: 30px; height: 30px; animation-delay: 0.9s; background: rgba(251,188,4,0.12); border-color: var(--warning); }
.cell.c5 { width: 24px; height: 24px; animation-delay: 1.2s; background: rgba(234,67,53,0.1); border-color: var(--danger); }

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.12); }
}

/* RNA Molecule */
.rna-molecule {
    position: absolute;
    top: 80px;
    right: 30px;
}
.rna-strand {
    width: 3px;
    height: 80px;
    background: linear-gradient(180deg, var(--accent), var(--primary));
    border-radius: 2px;
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
}
.rna-dot {
    width: 14px;
    height: 14px;
    border-radius: 50%;
    position: absolute;
    animation: float 4s ease-in-out infinite;
}
.rna-dot.d1 { background: var(--accent); top: 10px; left: 20px; animation-delay: 0s; }
.rna-dot.d2 { background: var(--warning); top: 35px; left: -18px; animation-delay: 0.5s; }
.rna-dot.d3 { background: var(--primary); top: 60px; left: 22px; animation-delay: 1s; }

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-8px); }
}

/* Stats Bar */
.home-stats-bar {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 0;
    background: rgba(255,255,255,0.8);
    backdrop-filter: blur(10px);
    border-radius: var(--radius);
    padding: 24px 32px;
    margin-bottom: 40px;
    border: 1px solid rgba(26,115,232,0.1);
    box-shadow: 0 2px 12px rgba(26,115,232,0.06);
}
.stat-item { text-align: center; padding: 0 32px; }
.stat-item .stat-num {
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--primary);
    display: block;
}
.stat-item .stat-label {
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-top: 2px;
}
.stat-divider {
    width: 1px;
    height: 40px;
    background: var(--border);
}

/* About Grid in Home */
.home-about { margin-top: 0; }
.about-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}
.about-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 24px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    transition: var(--transition);
}
.about-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-lg); }
.about-card .icon {
    width: 44px;
    height: 44px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.3rem;
    margin-bottom: 14px;
}
.about-card h3 { font-size: 1.05rem; margin-bottom: 6px; }
.about-card p { color: var(--text-secondary); font-size: 0.85rem; line-height: 1.6; }
.icon-dna { background: #e3f2fd; }
.icon-rna { background: #e8f5e9; }
.icon-cell { background: #fce4ec; }
.icon-clock { background: #fff3e0; }
.icon-db { background: #f3e5f5; }
.icon-book { background: #e0f2f1; }

/* ===== APA Browser ===== */
.browser-container {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 28px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    overflow: hidden;
}
.search-box {
    display: flex;
    gap: 12px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}
.search-box input {
    flex: 1;
    min-width: 180px;
    padding: 10px 18px;
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    font-family: var(--font);
    transition: var(--transition);
    outline: none;
}
.search-box input:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(26,115,232,0.15); }
.search-box select {
    padding: 10px 18px;
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    font-family: var(--font);
    background: #fff;
    outline: none;
    cursor: pointer;
    min-width: 130px;
}
.search-box select:focus { border-color: var(--primary); }
.search-box .btn-search {
    padding: 10px 28px;
    background: var(--primary);
    color: #fff;
    border: none;
    border-radius: var(--radius-sm);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    font-family: var(--font);
}
.search-box .btn-search:hover { background: var(--primary-dark); }
.browser-tabs {
    display: flex;
    gap: 0;
    border-bottom: 2px solid var(--border);
    margin-bottom: 16px;
}
.browser-tabs button {
    padding: 8px 20px;
    background: none;
    border: none;
    font-weight: 500;
    color: var(--text-secondary);
    cursor: pointer;
    font-family: var(--font);
    font-size: 0.85rem;
    transition: var(--transition);
    border-bottom: 2px solid transparent;
    margin-bottom: -2px;
}
.browser-tabs button.active { color: var(--primary); border-bottom-color: var(--primary); }
.browser-tabs button:hover { color: var(--primary); }
.browser-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.825rem;
}
.browser-table th {
    background: var(--bg);
    padding: 10px 14px;
    text-align: left;
    font-weight: 600;
    color: var(--text-secondary);
    border-bottom: 2px solid var(--border);
    white-space: nowrap;
}
.browser-table td {
    padding: 10px 14px;
    border-bottom: 1px solid var(--border);
    color: var(--text);
}
.browser-table tr:hover td { background: var(--primary-light); }
.browser-table .gene-name {
    color: var(--primary);
    font-weight: 600;
    cursor: pointer;
}
.browser-table .gene-name:hover { text-decoration: underline; }
.browser-table .tag {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 50px;
    font-size: 0.7rem;
    font-weight: 500;
}
.tag-utr { background: #e3f2fd; color: #1565c0; }
.tag-cds { background: #e8f5e9; color: #2e7d32; }
.tag-nc { background: #fff3e0; color: #e65100; }
.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 6px;
    margin-top: 20px;
}
.pagination button {
    padding: 6px 14px;
    border: 1px solid var(--border);
    background: #fff;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition);
    font-family: var(--font);
    font-size: 0.85rem;
}
.pagination button:hover { border-color: var(--primary); color: var(--primary); }
.pagination button.active { background: var(--primary); color: #fff; border-color: var(--primary); }
.pagination button:disabled { opacity: 0.4; cursor: not-allowed; }
.result-info {
    color: var(--text-secondary);
    font-size: 0.8rem;
    margin-bottom: 12px;
}

/* ===== Heterogeneity Analysis ===== */
.analysis-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}
.analysis-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 24px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
}
.analysis-card.full-width { grid-column: 1 / -1; }
.analysis-card h3 {
    font-size: 1rem;
    margin-bottom: 14px;
    display: flex;
    align-items: center;
    gap: 8px;
}
.analysis-card h3 .dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    display: inline-block;
}
.dot-blue { background: var(--primary); }
.dot-green { background: var(--accent); }
.dot-orange { background: var(--warning); }
.chart-placeholder {
    background: var(--bg);
    border-radius: var(--radius-sm);
    height: 240px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-light);
    font-size: 0.85rem;
    border: 1px dashed var(--border);
    position: relative;
    overflow: hidden;
}
.chart-placeholder canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100% !important;
    height: 100% !important;
}
.cluster-legend {
    display: flex;
    gap: 14px;
    flex-wrap: wrap;
    margin-top: 10px;
}
.cluster-legend .item {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.8rem;
}
.cluster-legend .swatch {
    width: 10px;
    height: 10px;
    border-radius: 3px;
}
.stat-row {
    display: flex;
    justify-content: space-between;
    padding: 6px 0;
    border-bottom: 1px solid var(--border);
    font-size: 0.85rem;
}
.stat-row:last-child { border-bottom: none; }
.stat-row .val { font-weight: 600; }

/* ===== Temporal Dynamics ===== */
.dynamics-container {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 28px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
}
.dynamics-controls {
    display: flex;
    gap: 14px;
    flex-wrap: wrap;
    margin-bottom: 20px;
    align-items: center;
}
.dynamics-controls label { font-size: 0.85rem; font-weight: 500; }
.dynamics-controls select {
    padding: 6px 14px;
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    font-family: var(--font);
    font-size: 0.85rem;
    background: #fff;
    outline: none;
    cursor: pointer;
}
.dynamics-controls select:focus { border-color: var(--primary); }
.dynamics-chart {
    background: var(--bg);
    border-radius: var(--radius-sm);
    height: 300px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-light);
    border: 1px dashed var(--border);
    position: relative;
    overflow: hidden;
}
.dynamics-chart canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100% !important;
    height: 100% !important;
}
.dynamics-info {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 14px;
    margin-top: 20px;
}
.dynamics-info .info-card {
    background: var(--bg);
    padding: 14px;
    border-radius: var(--radius-sm);
    text-align: center;
}
.dynamics-info .info-card .val {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--primary);
}
.dynamics-info .info-card .lbl {
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-top: 4px;
}

/* ===== DataHub ===== */
.hub-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 18px;
}
.hub-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 22px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    transition: var(--transition);
    cursor: pointer;
}
.hub-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-lg); }
.hub-card .hub-icon {
    width: 40px;
    height: 40px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    margin-bottom: 10px;
}
.hub-card h4 { font-size: 0.95rem; margin-bottom: 6px; }
.hub-card p { font-size: 0.8rem; color: var(--text-secondary); margin-bottom: 10px; line-height: 1.5; }
.hub-card .file-size {
    font-size: 0.75rem;
    color: var(--text-light);
    display: flex;
    align-items: center;
    gap: 6px;
}
.hub-card .download-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 5px 14px;
    border-radius: 50px;
    font-size: 0.75rem;
    font-weight: 500;
    background: var(--primary-light);
    color: var(--primary);
    border: none;
    cursor: pointer;
    transition: var(--transition);
    font-family: var(--font);
    margin-top: 8px;
}
.hub-card .download-btn:hover { background: var(--primary); color: #fff; }

/* ===== Help ===== */
.help-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}
.help-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 24px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
}
.help-card h3 {
    font-size: 1rem;
    margin-bottom: 14px;
    display: flex;
    align-items: center;
    gap: 8px;
}
.help-card p, .help-card li {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.7;
}
.help-card ul { padding-left: 20px; list-style: disc; }
.help-card li { margin-bottom: 4px; }
.faq-item {
    border-bottom: 1px solid var(--border);
    padding: 14px 0;
    cursor: pointer;
}
.faq-item:last-child { border-bottom: none; }
.faq-item .q {
    font-weight: 600;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.9rem;
}
.faq-item .q .arrow { transition: var(--transition); font-size: 0.8rem; }
.faq-item.open .q .arrow { transform: rotate(180deg); }
.faq-item .a {
    max-height: 0;
    overflow: hidden;
    transition: var(--transition);
    color: var(--text-secondary);
    font-size: 0.85rem;
    line-height: 1.6;
}
.faq-item.open .a { max-height: 200px; padding-top: 10px; }
.help-contact {
    background: var(--primary-light);
    border-radius: var(--radius);
    padding: 28px;
    text-align: center;
    margin-top: 28px;
}
.help-contact h3 { color: var(--primary); margin-bottom: 8px; font-size: 1rem; }
.help-contact p { color: var(--text-secondary); margin-bottom: 14px; font-size: 0.9rem; }
.help-contact .contact-btn {
    padding: 10px 24px;
    background: var(--primary);
    color: #fff;
    border: none;
    border-radius: 50px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    font-family: var(--font);
}
.help-contact .contact-btn:hover { background: var(--primary-dark); }

/* ===== Footer ===== */
.footer {
    background: #1a1a2e;
    color: #a0a0b8;
    padding: 48px 32px 32px;
}
.footer-grid {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
}
.footer h4 { color: #fff; font-size: 1rem; margin-bottom: 16px; }
.footer p { font-size: 0.85rem; line-height: 1.7; }
.footer ul li { margin-bottom: 8px; }
.footer ul a { font-size: 0.85rem; transition: var(--transition); cursor: pointer; }
.footer ul a:hover { color: #fff; }
.footer-bottom {
    max-width: 1200px;
    margin: 32px auto 0;
    padding-top: 24px;
    border-top: 1px solid rgba(255,255,255,0.08);
    text-align: center;
    font-size: 0.8rem;
}

/* ===== Chart.js Tooltip Z-Index Fix ===== */
.chartjs-tooltip {
    z-index: 10000 !important;
}
.chartjs-tooltip-key {
    z-index: 10000 !important;
}

/* ===== Loading Spinner ===== */
.spinner {
    width: 20px;
    height: 20px;
    border: 2px solid var(--border);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
    display: inline-block;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ===== Responsive ===== */
@media (max-width: 768px) {
    .navbar { padding: 0 16px; }
    .nav-links {
        position: fixed;
        top: var(--nav-height);
        left: 0;
        right: 0;
        background: rgba(255,255,255,0.98);
        backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 16px;
        gap: 4px;
        border-bottom: 1px solid var(--border);
        display: none;
        box-shadow: var(--shadow-lg);
    }
    .nav-links.open { display: flex; }
    .nav-links a { padding: 12px 16px; width: 100%; }
    .nav-toggle { display: flex; }
    .section-page { padding: 20px 16px 40px; }
    .section-header h2 { font-size: 1.5rem; }
    .section-header { margin-bottom: 28px; }

    /* Home responsive */
    .home-hero-content { flex-direction: column; gap: 32px; }
    .home-hero-text h1 { font-size: 2.4rem; }
    .home-illustration { width: 240px; height: 240px; }
    .dna-helix span { width: 60px; }
    .home-stats-bar { flex-wrap: wrap; gap: 16px; padding: 20px; }
    .stat-item { padding: 0 16px; }
    .stat-divider { display: none; }
    .about-grid { grid-template-columns: 1fr 1fr; }
    .home-actions { justify-content: center; }

    .analysis-grid { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr 1fr; gap: 24px; }
    .search-box { flex-direction: column; }
    .search-box input,
    .search-box select,
    .search-box .btn-search { width: 100%; min-width: unset; }
    .browser-table { font-size: 0.75rem; }
    .browser-table th, .browser-table td { padding: 6px 8px; }
    .browser-tabs { overflow-x: auto; }
    .hub-grid { grid-template-columns: 1fr 1fr; }
    .help-grid { grid-template-columns: 1fr; }
}
@media (max-width: 480px) {
    .about-grid { grid-template-columns: 1fr; }
    .hub-grid { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr; }
    .home-hero-text h1 { font-size: 1.8rem; }
    .stat-item .stat-num { font-size: 1.3rem; }
}

/* ===== Clustering Triple Layout ===== */
.clustering-toolbar {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 16px;
    padding: 8px 12px;
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    width: fit-content;
}
.clustering-toolbar-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-weight: 600;
    margin-right: 4px;
}
.cluster-btn {
    padding: 4px 16px;
    border: 1px solid var(--border);
    border-radius: 20px;
    background: transparent;
    color: var(--text-secondary);
    font-size: 0.82rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}
.cluster-btn:hover {
    border-color: var(--primary);
    color: var(--primary);
}
.cluster-btn.active {
    background: var(--primary);
    border-color: var(--primary);
    color: #fff;
}
.clustering-row {
    display: flex;
    flex-direction: row;
    gap: 16px;
    align-items: stretch;
}
.clustering-panel {
    flex: 1;
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 12px;
    display: flex;
    flex-direction: column;
    align-items: center;
    min-width: 0;
}
.clustering-label {
    font-size: 0.82rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 8px;
    text-align: center;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}
.clustering-svg-wrap {
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
}
.clustering-svg {
    width: 100%;
    height: auto;
    border-radius: 4px;
    cursor: zoom-in;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.clustering-svg:hover {
    transform: scale(1.03);
    box-shadow: 0 4px 20px rgba(0,0,0,0.35);
}
.clustering-svg.zoomed {
    transform: scale(1.5);
    cursor: zoom-out;
    box-shadow: 0 8px 40px rgba(0,0,0,0.5);
}
.clustering-caption {
    font-size: 0.68rem;
    color: var(--text-secondary);
    margin-top: 6px;
    text-align: center;
    font-style: italic;
}
.svg-zoom-overlay {
    display: none;
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0,0,0,0.88);
    z-index: 9999;
    justify-content: center;
    align-items: center;
    flex-direction: column;
}
.svg-zoom-overlay.active { display: flex; }
.svg-zoom-overlay img {
    max-width: 90vw;
    max-height: 88vh;
    border-radius: 8px;
    box-shadow: 0 0 80px rgba(255,255,255,0.12);
}
.svg-zoom-close {
    position: absolute;
    top: 16px; right: 24px;
    font-size: 2rem;
    color: #fff;
    cursor: pointer;
    width: 44px; height: 44px;
    text-align: center;
    background: rgba(255,255,255,0.12);
    border-radius: 50%;
    line-height: 44px;
    transition: background 0.2s;
}
.svg-zoom-close:hover { background: rgba(255,255,255,0.28); }