:root {
    --color-bg: #0a0a0f;
    --color-bg-elevated: #131318;
    --color-bg-card: #1a1a24;
    --color-border: #2a2a35;
    --color-text: #e8e8f0;
    --color-text-dim: #9a9aa8;
    --color-accent: #ffd700;
    --color-accent-soft: #ffed4e;
    --color-highlight: #00d9ff;
    
    --font-display: 'Playfair Display', serif;
    --font-body: 'DM Sans', sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
    
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    
    /* Era colors */
    --era-1950s: #ff6b9d;
    --era-1970s: #c77dff;
    --era-1980s: #7209b7;
    --era-1990s: #3a86ff;
    --era-2000s: #00d9ff;
    --era-2010s: #06ffa5;
}

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

body {
    font-family: var(--font-body);
    background-color: var(--color-bg);
    color: var(--color-text);
    overflow-x: hidden;
}

/* Grain overlay removed - was too visible and distracting */

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* Header */
.header {
    padding: var(--spacing-sm) 0;
    border-bottom: 1px solid var(--color-border);
    background: rgba(10, 10, 15, 0.95);
    backdrop-filter: blur(20px);
    position: sticky;
    top: 0;
    z-index: 200;
    min-height: 70px;
}

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

.logo {
    font-family: var(--font-display);
    font-size: 1.8rem;
    font-weight: 900;
    line-height: 1;
}

.logo a {
    color: var(--color-text);
    text-decoration: none;
    transition: color 0.3s ease;
}

.logo span {
    font-style: italic;
    color: var(--color-accent);
}

.nav {
    display: flex;
    gap: var(--spacing-sm);
}

.nav-link {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-text-dim);
    text-decoration: none;
    padding: 0.5rem 1rem;
    border: 1px solid transparent;
    border-radius: 4px;
    transition: all 0.3s ease;
}

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

.nav-link.active {
    color: var(--color-accent);
    border-color: var(--color-accent);
}

/* Main Content */
.main {
    min-height: 100vh;
    padding-bottom: var(--spacing-lg);
}

.intro {
    text-align: center;
    padding: var(--spacing-lg) var(--spacing-md);
    max-width: 800px;
    margin: 0 auto;
}

.intro-title {
    font-family: var(--font-display);
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 900;
    margin-bottom: var(--spacing-sm);
    background: linear-gradient(135deg, var(--color-text) 0%, var(--color-accent-soft) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.intro-text {
    font-size: 1.1rem;
    color: var(--color-text-dim);
    margin-bottom: var(--spacing-md);
    line-height: 1.7;
}

.controls {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
}

.control-btn {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    padding: 0.5rem 1rem;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    color: var(--color-text);
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.control-btn:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
    transform: translateY(-2px);
}

.control-label {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--color-text-dim);
    cursor: pointer;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.control-label input[type="checkbox"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
    accent-color: var(--color-accent);
}

/* Graph Container */
.graph-container {
    position: relative;
    width: 100%;
    height: calc(100vh - 300px);
    min-height: 600px;
    background: radial-gradient(ellipse at center, rgba(255, 215, 0, 0.03) 0%, transparent 70%);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    overflow: hidden;
    margin: var(--spacing-md);
}

#lineage-graph {
    width: 100%;
    height: 100%;
    cursor: grab;
}

#lineage-graph:active {
    cursor: grabbing;
}

/* Tooltip */
.tooltip {
    position: absolute;
    background: var(--color-bg-card);
    border: 1px solid var(--color-accent);
    border-radius: 8px;
    padding: var(--spacing-sm);
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.2s ease;
    z-index: 1000;
    max-width: 300px;
    box-shadow: 0 10px 40px rgba(255, 215, 0, 0.2);
}

.tooltip.show {
    opacity: 1;
}

.tooltip h4 {
    font-family: var(--font-display);
    font-size: 1.2rem;
    color: var(--color-accent);
    margin-bottom: 0.5rem;
}

.tooltip p {
    font-size: 0.85rem;
    color: var(--color-text-dim);
    margin-bottom: 0.5rem;
}

.tooltip .year {
    font-family: var(--font-mono);
    color: var(--color-highlight);
    font-weight: 600;
}

.tooltip .influences {
    font-size: 0.75rem;
    margin-top: 0.5rem;
    padding-top: 0.5rem;
    border-top: 1px solid var(--color-border);
}

.tooltip .influences strong {
    color: var(--color-text);
}

/* Legend */
.legend {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    padding: var(--spacing-md);
    margin: var(--spacing-md);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.legend h3 {
    font-family: var(--font-display);
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
    color: var(--color-accent);
}

.legend-items {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--spacing-sm);
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.85rem;
    color: var(--color-text-dim);
}

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

.era-1950s { background-color: var(--era-1950s); }
.era-1970s { background-color: var(--era-1970s); }
.era-1980s { background-color: var(--era-1980s); }
.era-1990s { background-color: var(--era-1990s); }
.era-2000s { background-color: var(--era-2000s); }
.era-2010s { background-color: var(--era-2010s); }

/* Footer */
.footer {
    background: var(--color-bg-elevated);
    border-top: 1px solid var(--color-border);
    padding: var(--spacing-md);
    text-align: center;
    color: var(--color-text-dim);
    font-family: var(--font-mono);
    font-size: 0.85rem;
}

/* SVG Styles for D3 */
.link {
    stroke: var(--color-border);
    stroke-opacity: 0.3;
    stroke-width: 1.5px;
    fill: none;
}

.link:hover {
    stroke: var(--color-accent);
    stroke-opacity: 0.6;
    stroke-width: 2px;
}

.link.highlighted {
    stroke: var(--color-accent);
    stroke-opacity: 0.8;
    stroke-width: 2.5px;
    animation: pulse 1.5s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { stroke-opacity: 0.5; }
    50% { stroke-opacity: 1; }
}

.node circle {
    cursor: pointer;
    stroke: var(--color-bg);
    stroke-width: 2px;
    transition: all 0.3s ease;
}

.node circle:hover {
    stroke: var(--color-accent);
    stroke-width: 3px;
    filter: drop-shadow(0 0 10px currentColor);
}

.node.highlighted circle {
    stroke: var(--color-accent);
    stroke-width: 4px;
    filter: drop-shadow(0 0 15px var(--color-accent));
}

.node text {
    font-family: var(--font-mono);
    font-size: 11px;
    fill: var(--color-text);
    text-anchor: middle;
    dominant-baseline: central;
    pointer-events: none;
    user-select: none;
}

.node.highlighted text {
    fill: var(--color-accent);
    font-weight: 600;
}

/* Responsive */
@media (max-width: 768px) {
    .intro-title {
        font-size: 2rem;
    }
    
    .graph-container {
        height: 500px;
    }
    
    .legend-items {
        grid-template-columns: 1fr;
    }
    
    .nav {
        gap: var(--spacing-sm);
    }
    
    .nav-link {
        font-size: 0.75rem;
        padding: 0.4rem 0.8rem;
    }
}