:root {
    /* Light Mode */
    --bg-primary: #faf8f0;
    --bg-secondary: #f0ead6;
    --bg-glass: rgba(250, 248, 240, 0.7);
    --text-primary: #1a1a2e;
    --text-secondary: #4a4a5a;
    --text-muted: #7a7a8a;
    --accent-gold: #c9a96e;
    --accent-gold-hover: #b8985d;
    --accent-burgundy: #8b2252;
    --border-color: rgba(26, 26, 46, 0.1);
    --border-glow: rgba(201, 169, 110, 0.5);
    
    /* Semantic */
    --badge-verified: #2e7d32;
    --badge-partial: #f57f17;
    --badge-disputed: #d84315;
    --badge-insufficient: #757575;
    
    --shadow-sm: 0 2px 4px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
    --shadow-lg: 0 12px 24px rgba(0,0,0,0.12);
    
    --font-ui: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-serif-sc: 'Noto Serif SC', serif;
    --font-serif-en: 'Source Serif 4', serif;
    --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
    
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-full: 9999px;
    
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
}

[data-theme="dark"] {
    --bg-primary: #141420;
    --bg-secondary: #1e1e2d;
    --bg-glass: rgba(20, 20, 32, 0.7);
    --text-primary: #e8e0cc;
    --text-secondary: #b0a89a;
    --text-muted: #807a70;
    --accent-gold: #d4a853;
    --accent-gold-hover: #e5b964;
    --accent-burgundy: #a0446e;
    --border-color: rgba(232, 224, 204, 0.1);
    --border-glow: rgba(212, 168, 83, 0.5);
    
    --badge-verified: #4caf50;
    --badge-partial: #ffeb3b;
    --badge-disputed: #ff5722;
    --badge-insufficient: #9e9e9e;
}

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

body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-family: var(--font-ui);
    line-height: 1.6;
    transition: background-color var(--transition-normal), color var(--transition-normal);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-serif-sc);
    font-weight: 600;
}

/* Header */
.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--bg-glass);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 2rem;
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo-area {
    display: flex;
    align-items: baseline;
    gap: 1rem;
}

.site-title {
    font-size: 1.5rem;
    color: var(--accent-burgundy);
    margin: 0;
}

.site-subtitle {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-family: var(--font-serif-sc);
}

.header-actions {
    display: flex;
    gap: 1rem;
    align-items: center;
}

/* Buttons */
.nav-button {
    background: transparent;
    border: none;
    font-family: var(--font-ui);
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 0.9rem;
    transition: color var(--transition-fast);
}
.nav-button:hover {
    color: var(--text-primary);
}

.primary-button {
    background-color: var(--accent-gold);
    color: var(--bg-primary);
    border: none;
    padding: 0.75rem 2rem;
    border-radius: var(--radius-full);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    align-self: center;
}

.primary-button:hover {
    background-color: var(--accent-gold-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.primary-button.small {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

.icon-button {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0.5rem;
    border-radius: var(--radius-full);
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
}

.icon-button:hover {
    background: var(--bg-secondary);
    color: var(--text-primary);
}

.sun-icon { display: none; width: 20px; height: 20px; }
.moon-icon { display: block; width: 20px; height: 20px; }
[data-theme="dark"] .sun-icon { display: block; }
[data-theme="dark"] .moon-icon { display: none; }

/* Main */
.main-content {
    flex: 1;
    max-width: 900px;
    margin: 0 auto;
    width: 100%;
    padding: 2rem;
}

/* Search Section */
.search-section {
    margin-bottom: 3rem;
    text-align: center;
}

.search-container {
    position: relative;
    max-width: 700px;
    margin: 0 auto 1rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

#searchInput {
    width: 100%;
    padding: 1.5rem;
    font-size: 1.25rem;
    font-family: var(--font-serif-sc);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    background: transparent;
    color: var(--text-primary);
    resize: none;
    transition: all var(--transition-fast);
}

#searchInput:focus {
    outline: none;
    border-color: var(--accent-gold);
    box-shadow: 0 0 15px var(--border-glow);
}

/* Themes & Filters */
.search-controls {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    margin-top: 1rem;
}

.ghost-button {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 0.5rem 1rem;
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: all var(--transition-fast);
}

.ghost-button:hover {
    background: var(--bg-secondary);
    color: var(--text-primary);
}

.theme-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    justify-content: center;
}

.theme-chip {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}
.theme-chip button {
    background: none; border: none; color: inherit; cursor: pointer;
}

.filters-panel {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    margin-top: 1rem;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1.5rem;
    overflow: hidden;
    transition: max-height var(--transition-normal), padding var(--transition-normal), opacity var(--transition-normal);
    max-height: 500px;
    opacity: 1;
}

.filters-panel.collapsed {
    max-height: 0;
    padding-top: 0;
    padding-bottom: 0;
    opacity: 0;
    border-color: transparent;
    margin-top: 0;
}

.filter-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    text-align: left;
}

.filter-group label {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.filter-group select {
    background: var(--bg-primary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 0.5rem;
    font-family: var(--font-ui);
}

.toggle-group {
    justify-content: flex-end;
}
.toggle-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
}

/* Cards */
.cards-container {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.result-card {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
    animation: fadeUp 0.5s ease backwards;
}
@keyframes fadeUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.result-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.literary-layer {
    padding: 2rem;
    position: relative;
}

.quotation-text {
    font-family: var(--font-serif-sc);
    font-size: 1.5rem;
    line-height: 1.8;
    color: var(--text-primary);
    margin-bottom: 1.5rem;
}
.quotation-text.en {
    font-family: var(--font-serif-en);
}

.original-text {
    font-family: var(--font-serif-en);
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
    border-left: 2px solid var(--border-color);
    padding-left: 1rem;
}

.translation-info {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-bottom: 1.5rem;
}

.attribution-sentence {
    font-family: var(--font-serif-sc);
    font-style: italic;
    font-size: 1.1rem;
    color: var(--accent-burgundy);
    text-align: right;
    margin-bottom: 1.5rem;
}

.verification-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    padding: 0.25rem 0.5rem;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 600;
    background: var(--bg-secondary);
}
.badge-verified { color: var(--badge-verified); }
.badge-partial { color: var(--badge-partial); }
.badge-disputed { color: var(--badge-disputed); }
.badge-insufficient { color: var(--badge-insufficient); }

.card-actions {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    margin-top: 1rem;
    border-top: 1px solid var(--border-color);
    padding-top: 1rem;
}

.action-btn {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 0.4rem 0.8rem;
    border-radius: var(--radius-sm);
    font-size: 0.8rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.4rem;
    transition: all var(--transition-fast);
    text-decoration: none;
}
.action-btn:hover {
    background: var(--bg-secondary);
    color: var(--text-primary);
    border-color: var(--accent-gold);
}

.evidence-layer {
    background: var(--bg-secondary);
    padding: 1.5rem 2rem;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--text-secondary);
    border-top: 1px dashed var(--border-color);
    display: none;
}
.evidence-layer.active {
    display: block;
}

.evidence-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.evidence-item {
    margin-bottom: 0.5rem;
}
.evidence-label {
    font-weight: 600;
    color: var(--text-primary);
    display: inline-block;
    width: 80px;
}

.confidence-bar {
    height: 4px;
    background: var(--border-color);
    border-radius: 2px;
    margin-top: 0.25rem;
    width: 100px;
    display: inline-block;
    vertical-align: middle;
}
.confidence-fill {
    height: 100%;
    background: var(--accent-gold);
    border-radius: 2px;
}

/* Modals & Panels */
.modal-overlay {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0,0,0,0.5);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 1;
    transition: opacity var(--transition-fast);
}
.modal-overlay.hidden {
    opacity: 0;
    pointer-events: none;
}

.modal-content {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    width: 90%;
    max-width: 600px;
    box-shadow: var(--shadow-lg);
    overflow: hidden;
}

.modal-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-body {
    padding: 1.5rem;
}

.citation-preview-quote {
    font-family: var(--font-serif-sc);
    font-style: italic;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    padding: 1rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-sm);
}

.citation-tabs {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    margin-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.5rem;
}

.tab-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    padding: 0.5rem 1rem;
    cursor: pointer;
    border-bottom: 2px solid transparent;
}
.tab-btn.active {
    color: var(--accent-gold);
    border-bottom-color: var(--accent-gold);
}

.citation-result-box {
    background: var(--bg-secondary);
    padding: 1rem;
    border-radius: var(--radius-sm);
    position: relative;
    font-family: var(--font-serif-sc);
}

.citation-result-text {
    margin-bottom: 1rem;
    min-height: 3rem;
}

/* Side Panel */
.side-panel {
    position: fixed;
    top: 0; right: 0; bottom: 0;
    width: 400px;
    background: var(--bg-primary);
    box-shadow: var(--shadow-lg);
    z-index: 900;
    transform: translateX(0);
    transition: transform var(--transition-normal);
    display: flex;
    flex-direction: column;
}
.side-panel.hidden {
    transform: translateX(100%);
}

.panel-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.panel-body {
    padding: 1.5rem;
    overflow-y: auto;
    flex: 1;
}

/* Utils & Utilities */
.hidden { display: none !important; }

.view-toggle {
    display: flex;
    background: var(--bg-secondary);
    border-radius: var(--radius-full);
    padding: 0.25rem;
}
.view-btn {
    background: transparent;
    border: none;
    padding: 0.25rem 1rem;
    border-radius: var(--radius-full);
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 0.875rem;
}
.view-btn.active {
    background: var(--bg-primary);
    color: var(--text-primary);
    box-shadow: var(--shadow-sm);
}

.results-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.unverified-section {
    margin-top: 3rem;
    border-top: 2px dashed var(--border-color);
    padding-top: 1rem;
}
.unverified-header {
    background: transparent;
    border: none;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    font-size: 1rem;
    margin-bottom: 1rem;
    width: 100%;
}
.unverified-header .chevron {
    transition: transform var(--transition-fast);
}
.unverified-section:not(.collapsed) .chevron {
    transform: rotate(180deg);
}
.unverified-section.collapsed #unverifiedContainer {
    display: none;
}

.loading-state {
    text-align: center;
    padding: 3rem;
    color: var(--text-muted);
}
.quill-loader {
    width: 40px; height: 40px;
    border: 3px solid var(--border-color);
    border-top-color: var(--accent-gold);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 1rem;
}
@keyframes spin { to { transform: rotate(360deg); } }

.empty-state {
    text-align: center;
    padding: 4rem 2rem;
    color: var(--text-muted);
}

/* Toast */
.toast {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    background: var(--text-primary);
    color: var(--bg-primary);
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-full);
    z-index: 2000;
    transition: opacity var(--transition-fast);
}

/* Footer */
.site-footer {
    text-align: center;
    padding: 2rem;
    color: var(--text-muted);
    font-size: 0.875rem;
    border-top: 1px solid var(--border-color);
}

/* Responsive */
@media (max-width: 768px) {
    .site-header { padding: 1rem; }
    .header-content { flex-direction: column; gap: 1rem; }
    .side-panel {
        width: 100%;
    }
    .evidence-grid {
        grid-template-columns: 1fr;
    }
    .results-header {
        flex-direction: column;
        gap: 1rem;
        align-items: flex-start;
    }
}