/* Deep Generation of Financial Time Series - Styles */

:root {
    --primary: #3b82f6;
    --primary-dark: #2563eb;
    --accent: #f59e0b;
    --dark: #0f172a;
    --dark-secondary: #1e293b;
    --text: #e2e8f0;
    --text-muted: #94a3b8;
    --border: #334155;
    --success: #10b981;
    --warning: #f59e0b;
    --error: #ef4444;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--dark);
    color: var(--text);
    line-height: 1.6;
}

/* Navbar */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 60px;
    background: rgba(15, 23, 42, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 2rem;
    z-index: 1000;
}

.nav-brand {
    font-weight: 600;
    font-size: 1.1rem;
    color: var(--text);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-icon {
    font-size: 1.3rem;
}

.nav-links {
    display: flex;
    gap: 1.5rem;
}

.nav-links a {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    transition: color 0.2s;
}

.nav-links a:hover {
    color: var(--primary);
}

/* Hero */
.hero {
    padding: 8rem 2rem 4rem;
    text-align: center;
    background: linear-gradient(135deg, var(--dark) 0%, var(--dark-secondary) 100%);
    border-bottom: 1px solid var(--border);
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
}

.hero h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, var(--text) 0%, var(--primary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero .subtitle {
    font-size: 1.3rem;
    color: var(--accent);
    margin-bottom: 1rem;
    font-weight: 500;
}

.hero .description {
    color: var(--text-muted);
    font-size: 1.1rem;
    margin-bottom: 2rem;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
}

.btn {
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    font-weight: 500;
    text-decoration: none;
    transition: all 0.2s;
    font-size: 0.95rem;
}

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

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
}

.btn-secondary {
    background: transparent;
    color: var(--text);
    border: 1px solid var(--border);
}

.btn-secondary:hover {
    background: var(--dark-secondary);
    border-color: var(--primary);
}

/* Stats */
.stats {
    padding: 4rem 2rem;
    background: var(--dark-secondary);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1.5rem;
    max-width: 1200px;
    margin: 0 auto;
}

.stat-card {
    background: var(--dark);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 1.5rem;
    text-align: center;
    transition: transform 0.2s, border-color 0.2s;
}

.stat-card:hover {
    transform: translateY(-4px);
    border-color: var(--primary);
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 0.25rem;
}

.stat-label {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 0.5rem;
}

.stat-detail {
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* Sections */
section {
    padding: 4rem 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

section h2 {
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: 2rem;
    text-align: center;
    color: var(--text);
}

/* Overview */
.overview-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
}

.overview-card {
    background: var(--dark-secondary);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 1.5rem;
}

.overview-card h3 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--primary);
    margin-bottom: 1rem;
}

.overview-card ul {
    list-style: none;
}

.overview-card li {
    font-size: 0.9rem;
    color: var(--text-muted);
    padding: 0.4rem 0;
    border-bottom: 1px solid var(--border);
}

.overview-card li:last-child {
    border-bottom: none;
}

.overview-card li::before {
    content: ">";
    color: var(--accent);
    margin-right: 0.5rem;
}

/* Models */
.models {
    background: var(--dark-secondary);
    padding: 4rem 2rem;
    max-width: 100%;
}

.models h2 {
    max-width: 1200px;
    margin: 0 auto 2rem;
}

.model-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1rem;
    max-width: 1200px;
    margin: 0 auto;
}

.model-card {
    background: var(--dark);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1.25rem;
}

.model-card h4 {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--accent);
    margin-bottom: 0.75rem;
}

.equation {
    font-family: 'Courier New', monospace;
    font-size: 0.85rem;
    color: var(--text);
    background: rgba(59, 130, 246, 0.1);
    padding: 0.5rem;
    border-radius: 4px;
    overflow-x: auto;
}

/* Resources */
.resource-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}

.resource-card {
    background: var(--dark-secondary);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 2rem;
    text-align: center;
    text-decoration: none;
    color: var(--text);
    transition: all 0.2s;
}

.resource-card:hover {
    border-color: var(--primary);
    transform: translateY(-4px);
}

.resource-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.resource-card h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.resource-card p {
    font-size: 0.9rem;
    color: var(--text-muted);
}

/* Topics */
.topic-pills {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    justify-content: center;
}

.pill {
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 500;
    background: var(--dark-secondary);
    border: 1px solid var(--border);
    color: var(--text-muted);
}

.pill.primary {
    background: rgba(59, 130, 246, 0.2);
    border-color: var(--primary);
    color: var(--primary);
}

.pill.secondary {
    background: rgba(245, 158, 11, 0.2);
    border-color: var(--accent);
    color: var(--accent);
}

/* Learning Objectives */
.objectives-list {
    max-width: 800px;
    margin: 0 auto;
}

.objective {
    display: flex;
    gap: 1.5rem;
    margin-bottom: 1.5rem;
    padding: 1.5rem;
    background: var(--dark-secondary);
    border: 1px solid var(--border);
    border-radius: 12px;
}

.objective-number {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: var(--primary);
    color: white;
    font-weight: 700;
    border-radius: 50%;
    flex-shrink: 0;
}

.objective-content h4 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 0.5rem;
}

.objective-content p {
    font-size: 0.9rem;
    color: var(--text-muted);
}

/* Footer */
footer {
    background: var(--dark-secondary);
    border-top: 1px solid var(--border);
    padding: 3rem 2rem 1rem;
    margin-top: 4rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    max-width: 1200px;
    margin: 0 auto 2rem;
}

.footer-section h4 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 1rem;
}

.footer-section p {
    font-size: 0.9rem;
    color: var(--text-muted);
}

.footer-section ul {
    list-style: none;
}

.footer-section li {
    margin-bottom: 0.5rem;
}

.footer-section a {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.9rem;
}

.footer-section a:hover {
    color: var(--primary);
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid var(--border);
}

.footer-bottom p {
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* Responsive */
@media (max-width: 768px) {
    .navbar {
        padding: 0 1rem;
    }

    .nav-links {
        display: none;
    }

    .hero h1 {
        font-size: 1.8rem;
    }

    .hero .subtitle {
        font-size: 1.1rem;
    }

    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .objective {
        flex-direction: column;
        gap: 1rem;
    }
}

/* Page-specific styles */
.page-header {
    padding: 6rem 2rem 2rem;
    text-align: center;
    background: var(--dark-secondary);
    border-bottom: 1px solid var(--border);
}

.page-header h1 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.page-header p {
    color: var(--text-muted);
}

.page-content {
    padding: 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

/* Tables */
.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
}

.data-table th,
.data-table td {
    padding: 0.75rem;
    text-align: left;
    border-bottom: 1px solid var(--border);
}

.data-table th {
    background: var(--dark-secondary);
    font-weight: 600;
    color: var(--text);
}

.data-table tr:hover {
    background: rgba(59, 130, 246, 0.05);
}

/* Search */
.search-box {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
}

.search-input {
    flex: 1;
    padding: 0.75rem 1rem;
    background: var(--dark-secondary);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text);
    font-size: 0.95rem;
}

.search-input:focus {
    outline: none;
    border-color: var(--primary);
}

.search-input::placeholder {
    color: var(--text-muted);
}

/* Chart Gallery */
.chart-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}

.chart-card {
    background: var(--dark-secondary);
    border: 1px solid var(--border);
    border-radius: 12px;
    overflow: hidden;
    transition: transform 0.2s;
}

.chart-card:hover {
    transform: translateY(-4px);
    border-color: var(--primary);
}

.chart-preview {
    aspect-ratio: 16/10;
    background: white;
    display: flex;
    align-items: center;
    justify-content: center;
}

.chart-preview img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
}

.chart-info {
    padding: 1rem;
}

.chart-info h4 {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 0.5rem;
}

.chart-info p {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.chart-category {
    display: inline-block;
    padding: 0.25rem 0.5rem;
    background: rgba(59, 130, 246, 0.2);
    color: var(--primary);
    font-size: 0.75rem;
    border-radius: 4px;
    margin-top: 0.5rem;
}

/* PDF Viewer */
.pdf-container {
    background: white;
    border-radius: 8px;
    overflow: hidden;
    margin-bottom: 2rem;
}

.pdf-viewer {
    width: 100%;
    height: 80vh;
    border: none;
}

/* Data Schema */
.schema-section {
    margin-bottom: 3rem;
}

.schema-section h3 {
    font-size: 1.2rem;
    color: var(--primary);
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--border);
}

.schema-table {
    width: 100%;
    background: var(--dark-secondary);
    border-radius: 8px;
    overflow: hidden;
}

.schema-table th {
    background: var(--dark);
}

/* Literature specific */
.filter-bar {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
}

.filter-select {
    padding: 0.5rem 1rem;
    background: var(--dark-secondary);
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--text);
    font-size: 0.9rem;
}

.filter-select:focus {
    outline: none;
    border-color: var(--primary);
}

.paper-count {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 1rem;
}

.pagination {
    display: flex;
    gap: 0.5rem;
    justify-content: center;
    margin-top: 2rem;
}

.page-btn {
    padding: 0.5rem 1rem;
    background: var(--dark-secondary);
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--text);
    cursor: pointer;
    transition: all 0.2s;
}

.page-btn:hover,
.page-btn.active {
    background: var(--primary);
    border-color: var(--primary);
}

.page-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}