:root {
    /* Hunan Red & Cultural Gold Theme */
    --app-bg: #fdfbf7;
    --panel-bg: rgba(255, 255, 255, 0.7);
    --glass-border: rgba(214, 59, 29, 0.1);
    --text-primary: #2c2c2c;
    --text-secondary: #7a7a7a;

    --accent-red: #d63b1d;
    --accent-gold: #c5a059;

    --people-color: #d63b1d;
    --works-color: #c5a059;
    --locations-color: #27c93f;

    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.08);

    --font-family: "Noto Serif SC", "Outfit", serif;
    --font-mono: "JetBrains Mono", monospace;
    --font-title: "Ma Shan Zheng", cursive;
}

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

body {
    font-family: var(--font-family);
    background-color: var(--app-bg);
    color: var(--text-primary);
    height: 100vh;
    overflow: hidden;
    display: flex;
    justify-content: center;
    align-items: center;
    background-image: url('https://images.unsplash.com/photo-1524661135-423995f22d0b?q=80&w=2574&auto=format&fit=crop');
    background-size: cover;
    background-position: center;
}

.app-container {
    width: 95vw;
    height: 90vh;
    max-width: 1800px;
    background: rgba(255, 252, 245, 0.95);
    backdrop-filter: blur(20px);
    border-radius: 24px;
    border: 1px solid var(--glass-border);
    box-shadow: var(--shadow-md);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

/* Header */
.main-header {
    padding: 1.5rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--glass-border);
    background: rgba(255, 255, 255, 0.5);
}

.header-content h1 {
    font-family: var(--font-title);
    font-size: 2rem;
    font-weight: 400;
    color: var(--accent-red);
}

.highlight {
    color: var(--accent-gold);
}

.subtitle {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-style: italic;
    margin-top: -5px;
}

.apple-btn {
    padding: 10px 20px;
    border-radius: 10px;
    font-family: var(--font-family);
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 8px;
    border: none;
}

.secondary-btn {
    background: #fff;
    border: 1px solid rgba(0, 0, 0, 0.1);
    color: var(--text-primary);
}

.secondary-btn:hover {
    background: #f5f5f5;
}

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

.primary-btn:hover {
    background: #c02f15;
}

/* Main Stage */
.main-stage {
    flex-grow: 1;
    display: grid;
    grid-template-columns: 1.3fr 1fr;
    gap: 2px;
    background: rgba(0, 0, 0, 0.05);
    overflow: hidden;
}

.graph-panel,
.query-panel {
    background: var(--panel-bg);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.panel-header {
    padding: 16px 24px;
    border-bottom: 1px solid var(--glass-border);
    background: rgba(255, 255, 255, 0.4);
}

.panel-header h3 {
    font-size: 1.2rem;
    color: var(--text-primary);
    margin-bottom: 4px;
}

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

/* Graph View */
.graph-container {
    flex-grow: 1;
    position: relative;
    overflow: hidden;
}

.graph-svg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 5;
}

.nodes-layer {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 10;
}

.entity-node {
    position: absolute;
    padding: 10px 14px;
    background: #fff;
    border-radius: 10px;
    border: 2px solid;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
    cursor: pointer;
    transition: all 0.3s ease;
    text-align: center;
    font-size: 0.85rem;
    font-weight: 600;
    min-width: 70px;
}

.entity-node:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.15);
}

.entity-node.people {
    border-color: var(--people-color);
    color: var(--people-color);
}

.entity-node.works {
    border-color: var(--works-color);
    color: var(--works-color);
}

.entity-node.locations {
    border-color: var(--locations-color);
    color: var(--locations-color);
}

.entity-node.selected {
    background: var(--accent-gold);
    color: white;
    border-color: var(--accent-gold);
}

.entity-node.highlighted {
    background: var(--accent-gold);
    color: white;
    border-color: var(--accent-gold);
    box-shadow: 0 0 20px rgba(197, 160, 89, 0.5);
    transform: scale(1.05);
}

.graph-edge {
    stroke: #999;
    stroke-width: 1.5;
    fill: none;
    marker-end: url(#arrow-normal);
    opacity: 0.3;
    transition: all 0.3s ease;
}

.graph-edge.highlighted {
    stroke: var(--accent-gold);
    stroke-width: 3;
    opacity: 1;
    marker-end: url(#arrow-highlight);
    filter: drop-shadow(0 0 4px var(--accent-gold));
}

/* Legend */
.legend-bar {
    padding: 12px 24px;
    background: rgba(255, 255, 255, 0.6);
    border-top: 1px solid var(--glass-border);
    display: flex;
    gap: 24px;
    justify-content: center;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.legend-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.legend-dot.people {
    background: var(--people-color);
}

.legend-dot.works {
    background: var(--works-color);
}

.legend-dot.locations {
    background: var(--locations-color);
}

/* Query Panel */
.query-panel {
    overflow-y: auto;
}

.query-section,
.results-section {
    padding: 20px;
}

.query-section h3,
.results-section h3 {
    font-size: 1.1rem;
    color: var(--text-primary);
    margin-bottom: 16px;
}

.query-cards {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.query-card {
    background: #fff;
    border-radius: 10px;
    padding: 12px;
    border: 1px solid rgba(0, 0, 0, 0.08);
}

.query-card.highlight {
    background: linear-gradient(135deg, #fffdf5 0%, #fff 100%);
    border-color: var(--accent-gold);
}

.card-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 6px;
}

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

.card-header h4 {
    font-size: 0.9rem;
    color: var(--text-primary);
}

.card-desc {
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-bottom: 6px;
    line-height: 1.4;
}

.card-formula {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--accent-gold);
    background: rgba(197, 160, 89, 0.1);
    padding: 4px 8px;
    border-radius: 4px;
    display: inline-block;
}

/* Results */
.results-container {
    background: #fff;
    border-radius: 10px;
    padding: 16px;
    min-height: 200px;
    border: 1px solid rgba(0, 0, 0, 0.08);
}

.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 180px;
    color: var(--text-secondary);
}

.empty-icon {
    font-size: 3rem;
    margin-bottom: 12px;
    opacity: 0.5;
}

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

.result-section h4 {
    font-size: 0.95rem;
    color: var(--accent-red);
    margin-bottom: 8px;
}

.result-list {
    list-style: none;
    padding: 0;
}

.result-list li {
    padding: 8px;
    background: rgba(0, 0, 0, 0.02);
    border-radius: 6px;
    margin-bottom: 6px;
    font-size: 0.85rem;
}

.result-badge {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 0.7rem;
    margin-left: 8px;
    background: var(--accent-gold);
    color: white;
}