/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #ffffff;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.section {
    padding: 100px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 80px;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 20px;
    color: #333;
    position: relative;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 2px;
}

.section-subtitle {
    font-size: 1.2rem;
    color: #666;
    max-width: 600px;
    margin: 0 auto;
}

/* Header Styles */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
    z-index: 1000;
    transition: all 0.3s ease;
}

.header.scrolled {
    background-color: rgba(255, 255, 255, 0.98);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 25px 30px;
    transition: padding 0.3s ease;
}

.header.scrolled .nav {
    padding: 18px 30px;
}

.nav-brand {
    flex: 1;
    z-index: 1001;
}

.nav-menu {
    flex: 2;
    display: flex;
    justify-content: center;
    list-style: none;
    gap: 40px;
}

.nav-spacer {
    flex: 1;
}

.brand-logo {
    display: flex;
    gap: 12px;
    align-items: center;
    text-decoration: none;
    color: #333;
    font-weight: 700;
    font-size: 1.5rem;
    transition: transform 0.3s ease;
}

.brand-logo:hover {
    transform: scale(1.05);
}

.logo-image {
    width: 40px;
    height: 40px;
    object-fit: contain;
    border-radius: 8px;
}

.logo-text {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-size: 1.8rem;
    font-weight: 800;
}

.nav-link {
    text-decoration: none;
    color: #333;
    font-weight: 500;
    transition: all 0.3s ease;
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    transition: width 0.3s ease;
}

.nav-link:hover::after,
.nav-link:focus::after {
    width: 100%;
}

.nav-link:hover {
    color: #667eea;
}

.nav-actions {
    display: flex;
    gap: 20px;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    background: none;
    border: none;
    cursor: pointer;
    padding: 12px;
    z-index: 1001;
}

.nav-toggle span {
    width: 25px;
    height: 3px;
    background-color: #333;
    margin: 3px 0;
    transition: all 0.3s ease;
}

.nav-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.nav-toggle.active span:nth-child(2) {
    opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
}

/* Button Styles */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 24px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    font-size: 0.95rem;
    transition: all 0.3s ease;
    border: 2px solid transparent;
    cursor: pointer;
    white-space: nowrap;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.4);
}

.btn-secondary {
    background: transparent;
    color: #667eea;
    border-color: #667eea;
}

.btn-secondary:hover {
    background: #667eea;
    color: white;
    transform: translateY(-2px);
}

.btn-outline {
    background: transparent;
    color: #333;
    border-color: #666;
}

.btn-outline:hover {
    background: #333;
    color: #fff;
    border-color: #333;
}

.btn-large {
    padding: 16px 32px;
    font-size: 1.1rem;
}

.btn-full {
    width: 100%;
}

/* Hero Section */
.hero {
    padding: 150px 0 100px;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg width="60" height="60" viewBox="0 0 60 60" xmlns="http://www.w3.org/2000/svg"><g fill="none" fill-rule="evenodd"><g fill="%23667eea" fill-opacity="0.05"><circle cx="30" cy="30" r="2"/></g></g></svg>') repeat;
    pointer-events: none;
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 30px;
    color: #333;
}

.title-highlight {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: block;
}

.hero-description {
    font-size: 1.2rem;
    color: #666;
    margin-bottom: 40px;
    line-height: 1.8;
    max-width: 900px;
    margin-left: auto;
    margin-right: auto;
}

.hero-actions {
    display: flex;
    gap: 20px;
    margin-bottom: 60px;
    justify-content: center;
}

.hero-stats {
    display: flex;
    gap: 60px;
    justify-content: center;
}

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

.stat-number {
    display: block;
    font-size: 2.5rem;
    font-weight: 700;
    color: #667eea;
}

.stat-label {
    font-size: 1rem;
    color: #666;
    margin-top: 5px;
}

/* Arena Overview Section */
.arena-overview {
    background: #ffffff;
}

.arena-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 30px;
}

.arena-card {
    background: white;
    border: 2px solid #f0f0f0;
    border-radius: 20px;
    padding: 30px;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.arena-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.arena-card:hover::before {
    transform: scaleX(1);
}

.arena-card:hover {
    border-color: #667eea;
    box-shadow: 0 10px 30px rgba(102, 126, 234, 0.1);
    transform: translateY(-5px);
}

.arena-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
}

.arena-header h3 {
    font-size: 1.4rem;
    color: #333;
}

.update-time {
    font-size: 0.85rem;
    color: #999;
}

.arena-desc {
    color: #666;
    line-height: 1.6;
    margin-bottom: 20px;
}

.arena-stats {
    display: flex;
    gap: 20px;
    margin-bottom: 25px;
    font-size: 0.9rem;
    color: #888;
}

/* Leaderboard Table */
.leaderboard-section {
    background: #ffffff;
}

.leaderboard-table-wrapper {
    overflow-x: auto;
    margin-bottom: 40px;
    border-radius: 15px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.08);
}

.leaderboard-table {
    width: 100%;
    border-collapse: collapse;
    background: white;
}

.leaderboard-table thead {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.leaderboard-table th {
    padding: 18px 15px;
    text-align: left;
    font-weight: 600;
    font-size: 0.95rem;
}

.leaderboard-table tbody tr {
    border-bottom: 1px solid #f0f0f0;
    transition: background 0.2s ease;
}

.leaderboard-table tbody tr:hover {
    background: #f8f9fa;
}

.leaderboard-table td {
    padding: 16px 15px;
    font-size: 0.95rem;
}

.model-name {
    font-weight: 600;
    color: #333;
    font-family: 'Courier New', monospace;
}

.score {
    font-weight: 700;
    font-size: 1.1rem;
    color: #667eea;
}

.rank-1 {
    background: #fff9e6;
}

.rank-2 {
    background: #f0f0f0;
}

.rank-3 {
    background: #fff4e6;
}

.badge {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 0.8rem;
    font-weight: 600;
}

.badge-proprietary {
    background: #e3f2fd;
    color: #1976d2;
}

.badge-open {
    background: #e8f5e9;
    color: #2e7d32;
}

.leaderboard-cta {
    text-align: center;
    margin-top: 40px;
}

/* Top Models Grid */
.top-models-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-bottom: 40px;
}

.top-model-card {
    background: white;
    border-radius: 20px;
    padding: 35px;
    text-align: center;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.08);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.top-model-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 5px;
}

.top-model-card.rank-1::before {
    background: linear-gradient(90deg, #FFD700, #FFA500);
}

.top-model-card.rank-2::before {
    background: linear-gradient(90deg, #C0C0C0, #808080);
}

.top-model-card.rank-3::before {
    background: linear-gradient(90deg, #CD7F32, #8B4513);
}

.top-model-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.12);
}

.rank-badge {
    font-size: 2rem;
    margin-bottom: 15px;
}

.top-model-card h3 {
    font-size: 1.5rem;
    color: #333;
    margin-bottom: 15px;
}

.model-score {
    font-size: 1.3rem;
    font-weight: 700;
    color: #667eea;
    margin-bottom: 10px;
}

.model-org {
    color: #999;
    margin-bottom: 15px;
}

.model-desc {
    color: #666;
    line-height: 1.6;
    font-size: 0.95rem;
}

/* Image Generation Showcase */
.image-gen-showcase {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 30px;
    margin-bottom: 40px;
}

.showcase-item {
    background: white;
    border-radius: 20px;
    padding: 30px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.08);
    transition: all 0.3s ease;
}

.showcase-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.12);
}

.showcase-rank {
    font-size: 3rem;
    text-align: center;
    margin-bottom: 20px;
}

.showcase-content h4 {
    font-size: 1.4rem;
    color: #333;
    margin-bottom: 10px;
}

.showcase-org {
    color: #999;
    margin-bottom: 20px;
}

.showcase-features {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.feature-tag {
    display: inline-block;
    padding: 6px 14px;
    background: #f0f0f0;
    border-radius: 15px;
    font-size: 0.85rem;
    color: #666;
}

/* Video Models Grid */
.video-models-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 30px;
    margin-bottom: 40px;
}

.video-model-card {
    background: white;
    border-radius: 20px;
    padding: 30px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.08);
    transition: all 0.3s ease;
}

.video-model-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.12);
}

.video-rank {
    font-size: 2rem;
    text-align: center;
    margin-bottom: 15px;
}

.video-model-card h4 {
    font-size: 1.4rem;
    color: #333;
    margin-bottom: 10px;
}

.video-org {
    color: #999;
    margin-bottom: 15px;
}

.video-stats {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 20px;
}

.video-stats span {
    display: inline-block;
    padding: 5px 12px;
    background: #f0f0f0;
    border-radius: 12px;
    font-size: 0.85rem;
    color: #666;
}

.video-desc {
    color: #666;
    line-height: 1.6;
    font-size: 0.95rem;
}

/* About Section */
.about-section {
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
}

.about-content {
    max-width: 1200px;
    margin: 0 auto;
}

.about-intro {
    margin-bottom: 60px;
}

.intro-card {
    background: white;
    border-radius: 20px;
    padding: 50px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
    text-align: center;
}

.intro-icon {
    font-size: 4rem;
    margin-bottom: 20px;
}

.intro-card h3 {
    font-size: 2rem;
    color: #333;
    margin-bottom: 25px;
}

.intro-card p {
    color: #666;
    line-height: 1.8;
    font-size: 1.1rem;
    margin-bottom: 20px;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 30px;
    margin-bottom: 60px;
}

.feature-card {
    background: white;
    border-radius: 15px;
    padding: 35px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.08);
    transition: all 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 40px rgba(102, 126, 234, 0.2);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 20px;
    display: block;
}

.feature-card h4 {
    font-size: 1.5rem;
    color: #333;
    margin-bottom: 15px;
}

.feature-card p {
    color: #666;
    line-height: 1.7;
    font-size: 1rem;
}

.about-stats-wrapper {
    margin-bottom: 60px;
}

.stats-title {
    font-size: 2rem;
    text-align: center;
    color: #333;
    margin-bottom: 40px;
}

.about-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    margin-bottom: 40px;
}

.stat-card {
    background: white;
    border-radius: 15px;
    padding: 35px;
    text-align: center;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.08);
    transition: all 0.3s ease;
}

.stat-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 40px rgba(102, 126, 234, 0.2);
}

.stat-icon {
    font-size: 3rem;
    margin-bottom: 15px;
}

.stat-card .stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: block;
    margin-bottom: 10px;
}

.stat-card .stat-label {
    font-size: 1.1rem;
    color: #333;
    font-weight: 600;
    margin-bottom: 8px;
}

.stat-card .stat-desc {
    font-size: 0.9rem;
    color: #999;
}

.cta-section {
    background: white;
    border-radius: 20px;
    padding: 50px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
    text-align: center;
}

.cta-section h3 {
    font-size: 2rem;
    color: #333;
    margin-bottom: 40px;
}

.benefits-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
    margin-bottom: 40px;
    text-align: left;
}

.benefit-item {
    display: flex;
    align-items: center;
    gap: 15px;
    padding: 15px;
    background: #f9f9f9;
    border-radius: 10px;
    transition: all 0.3s ease;
}

.benefit-item:hover {
    background: #f0f0ff;
}

.benefit-icon {
    font-size: 1.5rem;
}

.benefit-text {
    color: #666;
    font-size: 1.05rem;
}

.cta-buttons {
    display: flex;
    justify-content: center;
    gap: 20px;
    flex-wrap: wrap;
}

.about-text h3 {
    font-size: 1.8rem;
    color: #333;
    margin-bottom: 20px;
    margin-top: 30px;
}

.about-text h3:first-child {
    margin-top: 0;
}

.about-text p {
    color: #666;
    line-height: 1.8;
    margin-bottom: 25px;
}

.feature-list {
    list-style: none;
    margin-bottom: 30px;
}

.feature-list li {
    padding: 10px 0;
    color: #666;
    line-height: 1.8;
}

/* Footer */
.footer {
    background: #2c3e50;
    color: #ecf0f1;
    padding: 80px 0 30px;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr 1.5fr;
    gap: 60px;
    margin-bottom: 50px;
}

.footer-brand h3 {
    font-size: 1.5rem;
    margin-bottom: 20px;
}

.footer-brand p {
    color: #bdc3c7;
    line-height: 1.7;
}

.footer-section h4 {
    font-size: 1.2rem;
    margin-bottom: 25px;
    color: #ecf0f1;
}

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

.footer-section ul li {
    margin-bottom: 12px;
}

.footer-section ul li a {
    color: #bdc3c7;
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-section ul li a:hover {
    color: #667eea;
}

.contact-info p {
    margin-bottom: 10px;
    color: #bdc3c7;
}

.social-links {
    display: flex;
    gap: 15px;
    margin-top: 20px;
}

.social-links a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: #34495e;
    border-radius: 50%;
    text-decoration: none;
    transition: all 0.3s ease;
    font-size: 1.2rem;
}

.social-links a:hover {
    background: #667eea;
    transform: translateY(-2px);
}

.footer-divider {
    height: 1px;
    background: #34495e;
    margin-bottom: 30px;
}

.footer-bottom-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: #95a5a6;
}

.footer-links {
    display: flex;
    gap: 30px;
}

.footer-links a {
    color: #95a5a6;
    text-decoration: none;
    font-size: 0.9rem;
    transition: color 0.3s ease;
}

.footer-links a:hover {
    color: #667eea;
}

/* Back to Top Button */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 50%;
    font-size: 1.2rem;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 1000;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 20px rgba(102, 126, 234, 0.3);
}

/* Responsive Design */
@media (max-width: 1024px) {
    .container {
        padding: 0 30px;
    }
    
    .nav-menu {
        gap: 30px;
    }
    
    .hero-title {
        font-size: 3rem;
    }
    
    .about-content {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 2fr 1fr 1fr 1fr;
        gap: 40px;
    }
}

@media (max-width: 768px) {
    .nav {
        padding: 18px 20px;
    }
    
    .header.scrolled .nav {
        padding: 12px 20px;
    }
    
    .nav-menu {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100vh;
        background: rgba(255, 255, 255, 0.98);
        backdrop-filter: blur(10px);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: 40px;
        transform: translateX(-100%);
        transition: transform 0.3s ease;
    }
    
    .nav-menu .nav-link {
        font-size: 1.2rem;
        font-weight: 600;
        padding: 15px 0;
    }
    
    .nav-menu.active {
        transform: translateX(0);
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .nav-actions {
        display: none;
    }
    
    .hero {
        padding: 120px 0 80px;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-description {
        font-size: 1.1rem;
    }
    
    .hero-actions {
        flex-direction: column;
        align-items: center;
    }
    
    .hero-stats {
        flex-direction: column;
        gap: 30px;
    }
    
    .arena-grid {
        grid-template-columns: 1fr;
    }
    
    .top-models-grid {
        grid-template-columns: 1fr;
    }
    
    .image-gen-showcase {
        grid-template-columns: 1fr;
    }
    
    .video-models-grid {
        grid-template-columns: 1fr;
    }
    
    .leaderboard-table {
        font-size: 0.85rem;
    }
    
    .leaderboard-table th,
    .leaderboard-table td {
        padding: 12px 8px;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 40px;
        text-align: center;
    }
    
    .footer-bottom-content {
        flex-direction: column;
        gap: 20px;
        text-align: center;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .section {
        padding: 60px 0;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 20px;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-description {
        font-size: 1rem;
    }
    
    .section-title {
        font-size: 1.8rem;
    }
    
    .section-subtitle {
        font-size: 1rem;
    }
    
    .btn {
        padding: 10px 20px;
        font-size: 0.9rem;
    }
    
    .btn-large {
        padding: 14px 28px;
        font-size: 1rem;
    }
    
    .stat-number {
        font-size: 2rem;
    }
}