/* ===== CSS Variables & Reset ===== */
:root {
    --color-bg: #faf9f7;
    --color-surface: #ffffff;
    --color-surface-hover: #f5f4f1;
    --color-border: #e5e2dc;
    --color-border-light: #f0ede8;
    --color-text: #1a1a1a;
    --color-text-secondary: #5c5c5c;
    --color-text-muted: #8a8a8a;
    --color-accent: #2563eb;
    --color-accent-hover: #1d4ed8;
    --color-accent-light: #eff6ff;
    --color-paper: #7c3aed;
    --color-book: #059669;
    --color-grey: #d97706;
    --color-tag-bg: #f3f4f6;
    --color-tag-text: #374151;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-serif: 'Source Serif 4', Georgia, 'Times New Roman', serif;
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
    --shadow-md: 0 2px 8px rgba(0,0,0,0.06);
    --shadow-lg: 0 4px 16px rgba(0,0,0,0.08);
    --max-width: 1120px;
}

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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
}

body {
    font-family: var(--font-sans);
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    min-height: 100vh;
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
}

a {
    color: var(--color-accent);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

/* ===== Header ===== */
.site-header {
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    padding: 24px 0;
}

.site-header .container {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 16px;
}

.header-content {
    flex: 1;
}

.brand {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 6px;
    flex-wrap: wrap;
}

.brand-link {
    display: flex;
    align-items: center;
    gap: 6px;
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    text-decoration: none;
}

.brand-link:hover {
    color: var(--color-accent);
    text-decoration: none;
}

.brand-icon {
    font-size: 1.2rem;
    color: var(--color-accent);
}

.brand-separator {
    color: var(--color-text-muted);
    font-weight: 300;
}

.site-title {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-text);
    letter-spacing: -0.02em;
}

.site-tagline {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    margin-top: 2px;
}

.header-nav {
    display: flex;
    gap: 16px;
    align-items: center;
    padding-top: 6px;
}

.nav-link {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    text-decoration: none;
    padding: 4px 0;
}

.nav-link:hover {
    color: var(--color-accent);
    text-decoration: none;
}

/* ===== Stats Bar ===== */
.stats-bar {
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    padding: 16px 0;
}

.stats-grid {
    display: flex;
    gap: 32px;
    justify-content: flex-start;
    flex-wrap: wrap;
}

.stat {
    display: flex;
    align-items: baseline;
    gap: 6px;
}

.stat-number {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--color-text);
    font-variant-numeric: tabular-nums;
}

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

/* ===== Search & Filters ===== */
.search-section {
    padding: 24px 0 0;
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--color-bg);
}

.search-box {
    position: relative;
    margin-bottom: 16px;
}

.search-icon {
    position: absolute;
    left: 16px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--color-text-muted);
    pointer-events: none;
}

#searchInput {
    width: 100%;
    padding: 14px 44px 14px 48px;
    font-size: 1rem;
    font-family: var(--font-sans);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background: var(--color-surface);
    color: var(--color-text);
    transition: border-color 0.2s, box-shadow 0.2s;
}

#searchInput:focus {
    outline: none;
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

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

.clear-btn {
    position: absolute;
    right: 12px;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    font-size: 1.3rem;
    color: var(--color-text-muted);
    cursor: pointer;
    padding: 4px 8px;
    border-radius: 4px;
    display: none;
}

.clear-btn:hover {
    color: var(--color-text);
    background: var(--color-surface-hover);
}

.clear-btn.visible {
    display: block;
}

.filter-bar {
    padding-bottom: 16px;
    border-bottom: 1px solid var(--color-border-light);
}

.filter-group {
    margin-bottom: 8px;
}

.filter-label {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    margin-bottom: 6px;
    display: block;
}

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

.pill {
    padding: 6px 14px;
    font-size: 0.82rem;
    font-family: var(--font-sans);
    font-weight: 500;
    border: 1px solid var(--color-border);
    border-radius: 20px;
    background: var(--color-surface);
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: all 0.15s;
    white-space: nowrap;
}

.pill:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
}

.pill.active {
    background: var(--color-accent);
    border-color: var(--color-accent);
    color: white;
}

.filter-row {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    gap: 16px;
    flex-wrap: wrap;
}

.filter-row .filter-group:first-child {
    flex: 1;
}

.sort-select {
    padding: 6px 12px;
    font-size: 0.82rem;
    font-family: var(--font-sans);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    background: var(--color-surface);
    color: var(--color-text);
    cursor: pointer;
}

/* ===== Results ===== */
.results-section {
    padding: 16px 0 48px;
}

.results-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
}

.results-count {
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

.view-toggle {
    display: flex;
    gap: 4px;
}

.view-btn {
    padding: 6px 8px;
    background: none;
    border: 1px solid transparent;
    border-radius: var(--radius-sm);
    color: var(--color-text-muted);
    cursor: pointer;
    transition: all 0.15s;
}

.view-btn:hover {
    color: var(--color-text);
}

.view-btn.active {
    color: var(--color-accent);
    border-color: var(--color-border);
    background: var(--color-surface);
}

/* ===== Resource Cards ===== */
.resources-list {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.resources-list.grid-view {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: 12px;
}

.resource-card {
    display: block;
    background: var(--color-surface);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-sm);
    padding: 16px 20px;
    transition: all 0.15s;
    text-decoration: none;
    color: inherit;
}

.resource-card:hover {
    border-color: var(--color-border);
    box-shadow: var(--shadow-sm);
    text-decoration: none;
    background: var(--color-surface-hover);
}

.resource-card-header {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    margin-bottom: 6px;
}

.resource-type-badge {
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 3px 8px;
    border-radius: 4px;
    white-space: nowrap;
    flex-shrink: 0;
    margin-top: 3px;
}

.resource-type-badge.paper {
    background: #f3f0ff;
    color: var(--color-paper);
}

.resource-type-badge.book {
    background: #ecfdf5;
    color: var(--color-book);
}

.resource-type-badge.grey_literature {
    background: #fffbeb;
    color: var(--color-grey);
}

.resource-title {
    font-family: var(--font-serif);
    font-size: 1.05rem;
    font-weight: 600;
    line-height: 1.4;
    color: var(--color-text);
    flex: 1;
}

.resource-meta {
    display: flex;
    gap: 16px;
    align-items: center;
    flex-wrap: wrap;
    margin-bottom: 6px;
}

.resource-authors {
    font-size: 0.85rem;
    color: var(--color-text-secondary);
}

.resource-year {
    font-size: 0.8rem;
    color: var(--color-text-muted);
    font-weight: 500;
}

.resource-description {
    font-size: 0.85rem;
    color: var(--color-text-secondary);
    line-height: 1.5;
    margin-bottom: 8px;
}

.resource-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.resource-topic-tag {
    font-size: 0.75rem;
    padding: 3px 10px;
    border-radius: 12px;
    background: var(--color-tag-bg);
    color: var(--color-tag-text);
    font-weight: 500;
}

.resource-footer-right {
    display: flex;
    align-items: center;
    gap: 10px;
}

.resource-tag-count {
    font-size: 0.72rem;
    color: var(--color-text-muted);
    font-weight: 500;
}

.resource-link-icon {
    font-size: 0.8rem;
    color: var(--color-accent);
    opacity: 0;
    transition: opacity 0.15s;
}

.resource-card:hover .resource-link-icon {
    opacity: 1;
}

/* ===== Load More ===== */
.load-more-container {
    text-align: center;
    padding: 24px 0;
}

.load-more-btn {
    padding: 10px 32px;
    font-size: 0.9rem;
    font-family: var(--font-sans);
    font-weight: 500;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background: var(--color-surface);
    color: var(--color-text);
    cursor: pointer;
    transition: all 0.15s;
}

.load-more-btn:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
}

/* ===== No Results ===== */
.no-results {
    text-align: center;
    padding: 64px 24px;
    color: var(--color-text-muted);
}

.no-results svg {
    margin-bottom: 16px;
    opacity: 0.4;
}

.no-results p {
    margin-bottom: 16px;
    font-size: 1rem;
}

.reset-btn {
    padding: 8px 20px;
    font-size: 0.85rem;
    font-family: var(--font-sans);
    font-weight: 500;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    background: var(--color-surface);
    color: var(--color-accent);
    cursor: pointer;
}

.reset-btn:hover {
    background: var(--color-accent-light);
}

/* ===== About Section ===== */
.about-section {
    background: var(--color-surface);
    border-top: 1px solid var(--color-border);
    padding: 48px 0;
}

.about-section h2 {
    font-family: var(--font-serif);
    font-size: 1.6rem;
    margin-bottom: 20px;
}

.about-content {
    max-width: 720px;
}

.about-content p {
    margin-bottom: 14px;
    font-size: 0.95rem;
    color: var(--color-text-secondary);
    line-height: 1.7;
}

.about-topics {
    margin-top: 24px;
}

.about-topics h3,
.about-contribute h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 10px;
}

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

.topic-tag {
    font-size: 0.82rem;
    padding: 5px 14px;
    border-radius: 20px;
    background: var(--color-tag-bg);
    color: var(--color-tag-text);
    font-weight: 500;
}

.about-contribute {
    margin-top: 24px;
    padding-top: 20px;
    border-top: 1px solid var(--color-border-light);
}

.about-contribute p {
    font-size: 0.9rem;
}

/* ===== Footer ===== */
.site-footer {
    border-top: 1px solid var(--color-border);
    padding: 20px 0;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
}

.footer-content p {
    font-size: 0.82rem;
    color: var(--color-text-muted);
}

.footer-links {
    display: flex;
    gap: 16px;
}

.footer-links a {
    font-size: 0.82rem;
    color: var(--color-text-muted);
    text-decoration: none;
}

.footer-links a:hover {
    color: var(--color-accent);
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
    .site-header .container {
        flex-direction: column;
        gap: 12px;
    }

    .header-nav {
        padding-top: 0;
    }

    .site-title {
        font-size: 1.3rem;
    }

    .stats-grid {
        gap: 20px;
    }

    .stat-number {
        font-size: 1.1rem;
    }

    .search-section {
        position: static;
    }

    .filter-row {
        flex-direction: column;
        align-items: stretch;
    }

    .resources-list.grid-view {
        grid-template-columns: 1fr;
    }

    .resource-card {
        padding: 14px 16px;
    }

    .footer-content {
        flex-direction: column;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .brand {
        flex-direction: column;
        align-items: flex-start;
        gap: 2px;
    }

    .brand-separator {
        display: none;
    }

    .stats-grid {
        gap: 12px 20px;
    }

    .resource-card-header {
        flex-direction: column;
        gap: 6px;
    }
}

/* ===== Breadcrumb ===== */
.breadcrumb-section {
    padding: 12px 0;
    border-bottom: 1px solid var(--color-border-light);
    background: var(--color-surface);
}

.breadcrumb {
    font-size: 0.82rem;
    color: var(--color-text-muted);
    display: flex;
    align-items: center;
    gap: 6px;
    flex-wrap: wrap;
}

.breadcrumb a {
    color: var(--color-text-secondary);
    text-decoration: none;
}

.breadcrumb a:hover {
    color: var(--color-accent);
}

.breadcrumb-sep {
    color: var(--color-border);
}

.breadcrumb-current {
    color: var(--color-text-muted);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    max-width: 400px;
}

/* ===== Detail Page ===== */
.detail-section {
    padding: 32px 0 64px;
}

.detail-layout {
    display: grid;
    grid-template-columns: 1fr 340px;
    gap: 40px;
    align-items: start;
}

.detail-main {
    min-width: 0;
}

.site-title-link {
    text-decoration: none;
    color: inherit;
}

.site-title-link:hover {
    text-decoration: none;
}

/* Detail Header */
.detail-header {
    margin-bottom: 24px;
}

.detail-badges {
    display: flex;
    gap: 8px;
    margin-bottom: 12px;
    flex-wrap: wrap;
}

.access-badge {
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 3px 10px;
    border-radius: 4px;
    white-space: nowrap;
}

.access-badge.access-open_access {
    background: #ecfdf5;
    color: #059669;
}

.access-badge.access-free_to_read {
    background: #eff6ff;
    color: #2563eb;
}

.access-badge.access-check_access {
    background: #fffbeb;
    color: #d97706;
}

.verified-badge {
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 3px 10px;
    border-radius: 4px;
    background: #ecfdf5;
    color: #059669;
}

.detail-title {
    font-family: var(--font-serif);
    font-size: 1.8rem;
    font-weight: 700;
    line-height: 1.3;
    color: var(--color-text);
    margin-bottom: 10px;
    letter-spacing: -0.02em;
}

.detail-authors {
    font-size: 1rem;
    color: var(--color-text-secondary);
    margin-bottom: 8px;
    line-height: 1.5;
}

.detail-meta-row {
    display: flex;
    gap: 12px;
    align-items: center;
}

.detail-year {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--color-text);
}

.detail-topic-tag {
    font-size: 0.78rem;
    padding: 3px 12px;
    border-radius: 12px;
    background: var(--color-tag-bg);
    color: var(--color-tag-text);
    font-weight: 500;
}

/* Action Bar */
.detail-actions {
    display: flex;
    gap: 8px;
    margin-bottom: 24px;
    flex-wrap: wrap;
}

.action-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 10px 18px;
    font-size: 0.85rem;
    font-family: var(--font-sans);
    font-weight: 500;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    background: var(--color-surface);
    color: var(--color-text);
    cursor: pointer;
    text-decoration: none;
    transition: all 0.15s;
    white-space: nowrap;
}

.action-btn:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
    text-decoration: none;
}

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

.action-btn.action-primary:hover {
    background: var(--color-accent-hover);
}

/* Citation Panel */
.citation-panel {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 16px;
    margin-bottom: 24px;
}

.citation-tabs {
    display: flex;
    gap: 4px;
    margin-bottom: 12px;
}

.citation-tab {
    padding: 6px 14px;
    font-size: 0.8rem;
    font-family: var(--font-sans);
    font-weight: 500;
    border: 1px solid var(--color-border);
    border-radius: 4px;
    background: none;
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: all 0.15s;
}

.citation-tab.active {
    background: var(--color-accent);
    border-color: var(--color-accent);
    color: white;
}

.citation-content {
    font-family: 'Source Code Pro', 'Menlo', monospace;
    font-size: 0.82rem;
    line-height: 1.6;
    color: var(--color-text-secondary);
    background: var(--color-bg);
    padding: 12px;
    border-radius: var(--radius-sm);
    word-break: break-word;
    white-space: pre-wrap;
    margin-bottom: 8px;
}

.citation-copy {
    font-size: 0.8rem;
    font-family: var(--font-sans);
    font-weight: 500;
    padding: 6px 14px;
    border: 1px solid var(--color-border);
    border-radius: 4px;
    background: none;
    color: var(--color-accent);
    cursor: pointer;
    transition: all 0.15s;
}

.citation-copy:hover {
    background: var(--color-accent-light);
}

/* Description */
.detail-description {
    margin-bottom: 24px;
}

.detail-description h2,
.detail-tags h2,
.detail-notes h2 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 10px;
    color: var(--color-text);
}

.detail-description p {
    font-size: 0.95rem;
    line-height: 1.7;
    color: var(--color-text-secondary);
}

/* Tags */
.detail-tags {
    margin-bottom: 24px;
}

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

.detail-tag {
    font-size: 0.78rem;
    padding: 4px 12px;
    border-radius: 14px;
    background: var(--color-tag-bg);
    color: var(--color-tag-text);
    font-weight: 500;
    text-decoration: none;
    transition: all 0.15s;
}

.detail-tag:hover {
    background: var(--color-accent-light);
    color: var(--color-accent);
    text-decoration: none;
}

/* Community Notes */
.detail-notes {
    margin-bottom: 24px;
    padding: 20px;
    background: var(--color-surface);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-md);
}

.notes-empty {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    margin-bottom: 12px;
}

.notes-contribute {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--color-accent);
    text-decoration: none;
}

.notes-contribute:hover {
    text-decoration: underline;
}

/* Sidebar */
.detail-sidebar {
    display: flex;
    flex-direction: column;
    gap: 20px;
    position: sticky;
    top: 24px;
}

.sidebar-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-md);
    padding: 20px;
}

.sidebar-card h3 {
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-muted);
    margin-bottom: 14px;
}

/* Metadata List */
.meta-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.meta-item {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.meta-item dt {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.meta-item dd {
    font-size: 0.88rem;
    color: var(--color-text);
    word-break: break-word;
}

.meta-item dd a {
    color: var(--color-accent);
}

/* Related Resources */
.related-list {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.related-item {
    display: block;
    padding: 10px 12px;
    border-radius: var(--radius-sm);
    text-decoration: none;
    transition: background 0.15s;
}

.related-item:hover {
    background: var(--color-surface-hover);
    text-decoration: none;
}

.related-title {
    display: block;
    font-family: var(--font-serif);
    font-size: 0.88rem;
    font-weight: 500;
    color: var(--color-text);
    line-height: 1.4;
    margin-bottom: 2px;
}

.related-meta {
    font-size: 0.78rem;
    color: var(--color-text-muted);
}

.related-empty,
.related-loading {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    padding: 8px 0;
}

/* Detail Page Responsive */
@media (max-width: 900px) {
    .detail-layout {
        grid-template-columns: 1fr;
        gap: 24px;
    }

    .detail-sidebar {
        position: static;
    }

    .detail-title {
        font-size: 1.4rem;
    }
}

@media (max-width: 480px) {
    .detail-actions {
        flex-direction: column;
    }

    .action-btn {
        justify-content: center;
    }
}

/* ===== LitMap Visualization ===== */
.litmap-section {
    margin-bottom: 28px;
    background: var(--color-surface);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-md);
    padding: 20px;
}

.litmap-section h2 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--color-text);
}

.litmap-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
    flex-wrap: wrap;
    gap: 8px;
}

.litmap-legend {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.litmap-legend-item {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    font-size: 0.72rem;
    color: var(--color-text-secondary);
    white-space: nowrap;
}

.litmap-legend-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    flex-shrink: 0;
}

.litmap-actions {
    display: flex;
    gap: 4px;
}

.litmap-btn {
    padding: 5px 8px;
    background: none;
    border: 1px solid var(--color-border);
    border-radius: 4px;
    color: var(--color-text-muted);
    cursor: pointer;
    transition: all 0.15s;
    display: inline-flex;
    align-items: center;
}

.litmap-btn:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
}

.litmap-container {
    position: relative;
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-sm);
    overflow: hidden;
    background: var(--color-bg);
}

.litmap-container svg {
    display: block;
    width: 100%;
    height: 480px;
    user-select: none;
}

.litmap-node {
    transition: opacity 0.2s;
}

.litmap-node circle {
    transition: r 0.15s;
}

.litmap-node:hover circle:last-of-type {
    r: 16;
}

.litmap-caption {
    font-size: 0.72rem;
    color: var(--color-text-muted);
    margin-top: 8px;
    text-align: center;
}

/* Tooltip */
.litmap-tooltip {
    position: absolute;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    padding: 10px 14px;
    box-shadow: var(--shadow-md);
    z-index: 100;
    pointer-events: none;
    max-width: 280px;
    font-size: 0.82rem;
}

.litmap-tooltip-title {
    font-family: var(--font-serif);
    font-weight: 600;
    font-size: 0.88rem;
    color: var(--color-text);
    margin-bottom: 4px;
    line-height: 1.3;
}

.litmap-tooltip-meta {
    font-size: 0.78rem;
    color: var(--color-text-secondary);
    margin-bottom: 4px;
}

.litmap-tooltip-topic {
    font-size: 0.72rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    margin-bottom: 4px;
}

.litmap-tooltip-action {
    font-size: 0.72rem;
    color: var(--color-accent);
    font-weight: 500;
}

/* Fullscreen mode */
.litmap-fullscreen {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 1000;
    margin: 0;
    border-radius: 0;
    padding: 20px 24px;
    background: var(--color-bg);
}

.litmap-fullscreen .litmap-container svg {
    height: calc(100vh - 140px);
}

/* ===== Loading State ===== */
.loading-skeleton {
    background: linear-gradient(90deg, var(--color-surface-hover) 25%, var(--color-border-light) 50%, var(--color-surface-hover) 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
    border-radius: var(--radius-sm);
    height: 80px;
}

@keyframes shimmer {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}