:root {
    /* Heritage Gold & Revolutionary Red Theme */
    --app-bg: #fdfbf7;
    --panel-bg: rgba(255, 255, 255, 0.7);
    --glass-border: rgba(139, 0, 0, 0.1);
    --text-primary: #2c2c2c;
    --text-secondary: #7a7a7a;

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

    --gen1-color: #8b4513;
    /* Revolutionary Brown */
    --gen2-color: #d63b1d;
    /* Nation Red */
    --gen3-color: #c5a059;
    /* Reform Gold */
    --gen4-color: #007aff;
    /* New Era Blue */

    --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-1542621175-c80f5c996f23?q=80&w=2670&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;
}

/* 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;
}

.tree-panel,
.info-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);
}

/* Tree View */
.tree-container {
    flex-grow: 1;
    position: relative;
    overflow: hidden;
    background: linear-gradient(180deg, rgba(255, 248, 240, 0.3) 0%, rgba(255, 252, 245, 0.5) 100%);
}

.tree-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;
}

.member-node {
    position: absolute;
    padding: 12px 16px;
    background: #fff;
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    cursor: pointer;
    transition: all 0.3s ease;
    text-align: center;
    min-width: 100px;
    border: 2px solid;
}

.member-node:hover {
    transform: translateY(-3px) scale(1.05);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.15);
}

.member-node.gen1 {
    border-color: var(--gen1-color);
}

.member-node.gen2 {
    border-color: var(--gen2-color);
}

.member-node.gen3 {
    border-color: var(--gen3-color);
}

.member-node.gen4 {
    border-color: var(--gen4-color);
}

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

.member-node.highlighted {
    background: linear-gradient(135deg, #fff 0%, #fffdf5 100%);
    box-shadow: 0 0 20px rgba(197, 160, 89, 0.4);
    border-width: 3px;
}

.member-name {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 4px;
}

.member-era {
    font-size: 0.75rem;
    color: var(--text-secondary);
    font-style: italic;
}

.tree-edge {
    stroke: #999;
    stroke-width: 2;
    fill: none;
    marker-end: url(#arrow-tree);
    opacity: 0.3;
    transition: all 0.5s ease;
}

.tree-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));
}

/* Era Legend */
.era-legend {
    padding: 12px 24px;
    background: rgba(255, 255, 255, 0.6);
    border-top: 1px solid var(--glass-border);
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
}

.era-item {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

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

.era-dot.gen1 {
    background: var(--gen1-color);
}

.era-dot.gen2 {
    background: var(--gen2-color);
}

.era-dot.gen3 {
    background: var(--gen3-color);
}

.era-dot.gen4 {
    background: var(--gen4-color);
}

/* Info Panel */
.info-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;
}

.selected-member {
    background: #fff;
    border-radius: 12px;
    padding: 16px;
    margin-bottom: 16px;
    border: 1px solid rgba(0, 0, 0, 0.08);
}

.member-card {
    text-align: center;
}

.member-card h4 {
    font-size: 1.3rem;
    color: var(--accent-red);
    margin-bottom: 8px;
}

.member-info {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.query-buttons {
    display: flex;
    gap: 12px;
}

.query-btn {
    flex: 1;
    background: #fff;
    border: 1px solid rgba(0, 0, 0, 0.1);
    color: var(--text-primary);
    padding: 12px;
    flex-direction: column;
}

.query-btn:hover {
    background: #f5f5f5;
    transform: translateY(-2px);
}

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

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

.btn-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
}

.btn-formula {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    opacity: 0.7;
}

.results-container {
    background: #fff;
    border-radius: 12px;
    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: 150px;
    color: var(--text-secondary);
}

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

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

.ancestor-item {
    padding: 12px;
    background: rgba(0, 0, 0, 0.02);
    border-radius: 8px;
    margin-bottom: 8px;
    border-left: 3px solid;
}

.ancestor-item.gen1 {
    border-color: var(--gen1-color);
}

.ancestor-item.gen2 {
    border-color: var(--gen2-color);
}

.ancestor-item.gen3 {
    border-color: var(--gen3-color);
}

.ancestor-item h5 {
    font-size: 0.95rem;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.ancestor-item p {
    font-size: 0.8rem;
    color: var(--text-secondary);
    line-height: 1.5;
}