styles.css

/* Root Variables */
:root {
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --secondary: #10b981;
    --accent: #f59e0b;
    --bg-dark: #0f172a;
    --bg-card: #1e293b;
    --bg-card-hover: #334155;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --border: #334155;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -2px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4), 0 4px 6px -4px rgba(0, 0, 0, 0.3);
    --gradient-primary: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
    --gradient-hero: linear-gradient(135deg, #1e293b 0%, #0f172a 50%, #1a1f3c 100%);
}

/* Reset & Base */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

/* Hero Section */
.hero {
    background: var(--gradient-hero);
    padding: 4rem 2rem 3rem;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20% 50%, rgba(99, 102, 241, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 80% 50%, rgba(139, 92, 246, 0.1) 0%, transparent 50%);
    pointer-events: none;
}

.hero-content {
    max-width: 900px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

.badge {
    display: inline-block;
    background: rgba(99, 102, 241, 0.2);
    color: var(--primary-light);
    padding: 0.5rem 1rem;
    border-radius: 2rem;
    font-size: 0.85rem;
    font-weight: 500;
    margin-bottom: 1rem;
    border: 1px solid rgba(99, 102, 241, 0.3);
}

.hero h1 {
    font-size: 3.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, #f1f5f9 0%, #818cf8 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.75rem;
    letter-spacing: -0.02em;
}

.subtitle {
    font-size: 1.35rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
    font-weight: 400;
}

.description {
    font-size: 1rem;
    color: var(--text-muted);
    max-width: 700px;
    margin: 0 auto 2rem;
    line-height: 1.7;
}

.stats-row {
    display: flex;
    justify-content: center;
    gap: 3rem;
    margin-top: 2rem;
}

.stat-item {
    text-align: center;
}

.stat-value {
    display: block;
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-light);
}

.stat-label {
    font-size: 0.9rem;
    color: var(--text-muted);
}

/* Navigation Tabs */
.nav-tabs {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    padding: 1rem 2rem;
    background: var(--bg-card);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
    flex-wrap: wrap;
}

.nav-tab {
    padding: 0.75rem 1.5rem;
    background: transparent;
    border: 1px solid transparent;
    border-radius: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    font-family: inherit;
}

.nav-tab:hover {
    color: var(--text-primary);
    background: var(--bg-card-hover);
}

.nav-tab.active {
    color: var(--primary-light);
    background: rgba(99, 102, 241, 0.15);
    border-color: rgba(99, 102, 241, 0.3);
}

/* Main Content */
.content {
    max-width: 1400px;
    margin: 0 auto;
    padding: 2rem;
}

/* Sections */
.section {
    display: none;
    animation: fadeIn 0.3s ease;
}

.section.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.section-header {
    margin-bottom: 2rem;
    text-align: center;
}

.section-header h2 {
    font-size: 1.75rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.section-header p {
    color: var(--text-muted);
    font-size: 1rem;
}

/* Controls */
.controls {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
}

.controls label {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.controls label span {
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
}

.controls select {
    padding: 0.6rem 1rem;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 0.5rem;
    color: var(--text-primary);
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.2s ease;
    font-family: inherit;
    min-width: 160px;
}

.controls select:hover {
    border-color: var(--primary);
}

.controls select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
}

/* Chart Container */
.chart-container {
    background: var(--bg-card);
    border-radius: 1rem;
    padding: 1.5rem;
    box-shadow: var(--shadow);
    min-height: 500px;
    border: 1px solid var(--border);
}

.chart-container.tall {
    min-height: 700px;
}

/* Footer */
.footer {
    text-align: center;
    padding: 2rem;
    color: var(--text-muted);
    font-size: 0.9rem;
    border-top: 1px solid var(--border);
    margin-top: 3rem;
}

/* Responsive */
@media (max-width: 768px) {
    .hero {
        padding: 3rem 1.5rem 2rem;
    }
    
    .hero h1 {
        font-size: 2.5rem;
    }
    
    .subtitle {
        font-size: 1.1rem;
    }
    
    .stats-row {
        gap: 1.5rem;
    }
    
    .stat-value {
        font-size: 2rem;
    }
    
    .nav-tabs {
        padding: 0.75rem 1rem;
        gap: 0.25rem;
    }
    
    .nav-tab {
        padding: 0.5rem 1rem;
        font-size: 0.85rem;
    }
    
    .content {
        padding: 1rem;
    }
    
    .controls {
        flex-direction: column;
        align-items: stretch;
    }
    
    .controls label {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .controls select {
        width: 100%;
    }
}

/* Plotly overrides for dark theme */
.js-plotly-plot .plotly .modebar {
    background: rgba(30, 41, 59, 0.9) !important;
}

.js-plotly-plot .plotly .modebar-btn path {
    fill: var(--text-secondary) !important;
}

.js-plotly-plot .plotly .modebar-btn:hover path {
    fill: var(--text-primary) !important;
}