/* YouTube Tagging Dataset Landing Page Styles */

:root {
    --color-primary: #FF0000;
    --color-secondary: #282828;
    --color-accent: #065FD4;
    --color-text: #0f0f0f;
    --color-text-light: #606060;
    --color-bg: #ffffff;
    --color-bg-light: #f9f9f9;
    --color-border: #e5e5e5;
    --font-main: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: var(--font-main);
    color: var(--color-text);
    background-color: var(--color-bg);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

/* Hero Section */
.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 6rem 0 8rem;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(255, 0, 0, 0.1) 0%, rgba(6, 95, 212, 0.1) 100%);
    opacity: 0.5;
}

.hero-content {
    position: relative;
    z-index: 1;
}

.badge {
    display: inline-block;
    background: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
    padding: 0.5rem 1rem;
    border-radius: 50px;
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 1rem;
    border: 1px solid rgba(255, 255, 255, 0.3);
}

.hero h1 {
    font-size: 3.5rem;
    font-weight: 800;
    margin-bottom: 0.5rem;
    line-height: 1.1;
    letter-spacing: -0.02em;
}

.subtitle {
    font-size: 2rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    opacity: 0.9;
}

.hero-description {
    font-size: 1.25rem;
    max-width: 800px;
    margin: 0 auto 2.5rem;
    line-height: 1.7;
    opacity: 0.95;
}

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

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem 2rem;
    border-radius: 12px;
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition);
    cursor: pointer;
    border: none;
}

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

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.1);
    border: 2px solid white;
    color: white;
    backdrop-filter: blur(10px);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
}

.icon {
    width: 20px;
    height: 20px;
}

/* Stats Section */
.stats-section {
    background: white;
    padding: 4rem 0;
    margin-top: -4rem;
    position: relative;
    z-index: 2;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.stat-card {
    background: var(--color-bg-light);
    padding: 2rem;
    border-radius: 16px;
    text-align: center;
    border: 1px solid var(--color-border);
    transition: var(--transition);
}

.stat-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--color-primary);
    margin-bottom: 0.5rem;
    line-height: 1;
}

.stat-label {
    font-size: 1rem;
    color: var(--color-text-light);
    font-weight: 500;
}

/* Findings Section */
.findings-section {
    padding: 5rem 0;
    background: var(--color-bg-light);
}

.findings-section h2,
.viz-section h2,
.research-section h2,
.use-cases-section h2,
.download-section h2,
.citation-section h2 {
    font-size: 2.5rem;
    font-weight: 800;
    text-align: center;
    margin-bottom: 3rem;
    color: var(--color-text);
}

.findings-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.finding-card {
    background: white;
    padding: 2rem;
    border-radius: 16px;
    border: 1px solid var(--color-border);
    transition: var(--transition);
}

.finding-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.finding-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.finding-card h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--color-text);
}

.finding-card p {
    color: var(--color-text-light);
    line-height: 1.7;
}

/* Visualizations Section */
.viz-section {
    padding: 5rem 0;
    background: white;
}

.viz-card {
    background: var(--color-bg-light);
    padding: 2rem;
    border-radius: 16px;
    border: 1px solid var(--color-border);
    margin-bottom: 2rem;
}

.viz-card img {
    width: 100%;
    height: auto;
    border-radius: 8px;
    display: block;
}

.viz-caption {
    margin-top: 1rem;
    text-align: center;
    color: var(--color-text-light);
    font-size: 0.95rem;
    font-style: italic;
}

.viz-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(500px, 1fr));
    gap: 2rem;
}

/* Research Section */
.research-section {
    padding: 5rem 0;
    background: var(--color-bg-light);
}

.research-content {
    max-width: 900px;
    margin: 0 auto;
}

.research-text p {
    margin-bottom: 1.5rem;
    font-size: 1.1rem;
    line-height: 1.8;
    color: var(--color-text);
}

.research-text h3 {
    font-size: 1.75rem;
    font-weight: 700;
    margin: 2rem 0 1rem;
    color: var(--color-text);
}

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

.publications-list li {
    background: white;
    padding: 1.5rem;
    border-radius: 12px;
    margin-bottom: 1rem;
    border: 1px solid var(--color-border);
    line-height: 1.7;
}

.publications-list a {
    color: var(--color-accent);
    text-decoration: none;
    font-weight: 600;
}

.publications-list a:hover {
    text-decoration: underline;
}

/* Use Cases Section */
.use-cases-section {
    padding: 5rem 0;
    background: white;
}

.use-cases-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}

.use-case-card {
    background: var(--color-bg-light);
    padding: 2rem;
    border-radius: 16px;
    border: 1px solid var(--color-border);
    transition: var(--transition);
}

.use-case-card:hover {
    border-color: var(--color-accent);
    transform: translateY(-4px);
    box-shadow: 0 10px 30px rgba(6, 95, 212, 0.1);
}

.use-case-card h3 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
    color: var(--color-text);
}

.use-case-card p {
    color: var(--color-text-light);
    line-height: 1.6;
}

/* Download Section */
.download-section {
    padding: 5rem 0;
    background: var(--color-bg-light);
}

.section-intro {
    text-align: center;
    font-size: 1.1rem;
    color: var(--color-text-light);
    margin-bottom: 3rem;
}

.download-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.download-card {
    background: white;
    padding: 2rem;
    border-radius: 16px;
    border: 1px solid var(--color-border);
    transition: var(--transition);
}

.download-card:hover {
    border-color: var(--color-primary);
    transform: translateY(-4px);
    box-shadow: 0 10px 30px rgba(255, 0, 0, 0.1);
}

.download-card h3 {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--color-text);
}

.download-card p {
    color: var(--color-text-light);
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.btn-link {
    color: var(--color-accent);
    text-decoration: none;
    font-weight: 600;
    font-size: 1rem;
    display: inline-flex;
    align-items: center;
    transition: var(--transition);
}

.btn-link:hover {
    gap: 0.5rem;
}

/* Citation Section */
.citation-section {
    padding: 5rem 0;
    background: white;
}

.citation-box {
    background: var(--color-secondary);
    color: #f0f0f0;
    padding: 2rem;
    border-radius: 16px;
    position: relative;
    max-width: 800px;
    margin: 0 auto;
}

.citation-box pre {
    margin: 0;
    overflow-x: auto;
}

.citation-box code {
    font-family: 'Monaco', 'Menlo', monospace;
    font-size: 0.9rem;
    line-height: 1.6;
}

.copy-btn {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 8px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    font-weight: 600;
    transition: var(--transition);
}

.copy-btn:hover {
    background: rgba(255, 255, 255, 0.2);
}

/* Footer */
.footer {
    background: var(--color-secondary);
    color: rgba(255, 255, 255, 0.8);
    padding: 4rem 0 2rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h4 {
    color: white;
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.footer-section p {
    line-height: 1.8;
    font-size: 0.95rem;
}

.footer-section a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: var(--transition);
}

.footer-section a:hover {
    color: white;
}

.footer-links {
    list-style: none;
    padding: 0;
}

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

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 2rem;
    text-align: center;
    font-size: 0.875rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2.5rem;
    }
    
    .subtitle {
        font-size: 1.5rem;
    }
    
    .hero-description {
        font-size: 1.1rem;
    }
    
    .stats-grid,
    .findings-grid,
    .use-cases-grid,
    .download-grid {
        grid-template-columns: 1fr;
    }
    
    .viz-grid {
        grid-template-columns: 1fr;
    }
    
    .stat-number {
        font-size: 2.5rem;
    }
    
    h2 {
        font-size: 2rem !important;
    }
    
    .container {
        padding: 0 1.5rem;
    }
}

/* Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.stat-card,
.finding-card,
.use-case-card,
.download-card {
    animation: fadeInUp 0.6s ease-out;
}