:root {
    --primary-color: #F97316;
    --primary-dark: #EA580C;
    --secondary-color: #FB923C;
    --accent-color: #FBBF24;
    --bg-dark: #0F172A;
    --bg-card: #451A03;
    --text-primary: #FFFFFF;
    --text-secondary: #CBD5E1;
    --text-muted: #94A3B8;
    --border-color: #EA580C;
    --success-color: #10B981;
    --warning-color: #F59E0B;
    --danger-color: #EF4444;
}

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

body {
    font-family: 'PingFang SC', 'Microsoft YaHei', sans-serif;
    background: linear-gradient(135deg, #0F172A 0%, #451A03 50%, #0F172A 100%);
    color: var(--text-primary);
    min-height: 100vh;
}

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

.header {
    background: rgba(15, 23, 42, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 15px 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: 8px;
}

.logo-icon {
    font-size: 28px;
}

.logo-text {
    font-size: 24px;
    font-weight: bold;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.main-nav {
    display: flex;
    gap: 30px;
}

.nav-link {
    text-decoration: none;
    color: var(--text-secondary);
    font-size: 15px;
    transition: all 0.3s ease;
    position: relative;
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary-color);
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 100%;
    height: 2px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    border-radius: 1px;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 15px;
}

.search-box {
    display: flex;
    align-items: center;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    border-radius: 25px;
    padding: 8px 15px;
}

.search-input {
    background: transparent;
    border: none;
    outline: none;
    color: var(--text-primary);
    font-size: 14px;
    width: 150px;
}

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

.search-btn {
    background: none;
    border: none;
    cursor: pointer;
    font-size: 14px;
}

.login-btn {
    background: transparent;
    border: 1px solid var(--primary-color);
    color: var(--primary-color);
    padding: 8px 20px;
    border-radius: 20px;
    cursor: pointer;
    font-size: 14px;
    transition: all 0.3s ease;
}

.login-btn:hover {
    background: rgba(249, 115, 22, 0.1);
}

.register-btn {
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    border: none;
    color: white;
    padding: 8px 20px;
    border-radius: 20px;
    cursor: pointer;
    font-size: 14px;
    transition: all 0.3s ease;
}

.register-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 20px rgba(249, 115, 22, 0.4);
}

.main-content {
    padding-bottom: 60px;
}

.hero-section {
    position: relative;
    padding: 80px 0;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(ellipse at center, rgba(249, 115, 22, 0.15) 0%, transparent 70%);
    animation: pulse 3s ease-in-out infinite;
}

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

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

.hero-title {
    font-size: 56px;
    font-weight: bold;
    margin-bottom: 20px;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-desc {
    font-size: 20px;
    color: var(--text-secondary);
    margin-bottom: 40px;
}

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

.btn-primary {
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 12px 30px;
    border-radius: 25px;
    text-decoration: none;
    font-size: 16px;
    font-weight: 600;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(249, 115, 22, 0.5);
}

.btn-secondary {
    background: transparent;
    border: 1px solid var(--primary-color);
    color: var(--primary-color);
    padding: 12px 30px;
    border-radius: 25px;
    text-decoration: none;
    font-size: 16px;
    font-weight: 600;
    transition: all 0.3s ease;
}

.btn-secondary:hover {
    background: rgba(249, 115, 22, 0.1);
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 80px;
}

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

.stat-number {
    display: block;
    font-size: 40px;
    font-weight: bold;
    color: var(--primary-color);
}

.stat-label {
    display: block;
    font-size: 14px;
    color: var(--text-muted);
    margin-top: 5px;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
}

.section-title {
    font-size: 28px;
    font-weight: bold;
    color: var(--text-primary);
}

.view-all {
    text-decoration: none;
    color: var(--primary-color);
    font-size: 14px;
    transition: all 0.3s ease;
}

.view-all:hover {
    transform: translateX(5px);
}

.featured-section {
    padding: 60px 0;
}

.featured-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 20px;
}

.featured-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 15px;
    overflow: hidden;
    transition: all 0.3s ease;
}

.featured-card:hover {
    transform: translateY(-5px);
    border-color: var(--primary-color);
    box-shadow: 0 10px 30px rgba(249, 115, 22, 0.2);
}

.featured-card.main {
    display: flex;
    flex-direction: column;
}

.featured-thumbnail {
    position: relative;
    height: 250px;
}

.featured-card:not(.main) .featured-thumbnail {
    height: 150px;
}

.featured-thumbnail img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.play-overlay {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 60px;
    height: 60px;
    background: rgba(249, 115, 22, 0.8);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.featured-card:hover .play-overlay {
    opacity: 1;
}

.featured-info {
    padding: 20px;
}

.featured-card:not(.main) .featured-info {
    padding: 15px;
}

.featured-tag {
    font-size: 12px;
    color: var(--primary-color);
    background: rgba(249, 115, 22, 0.2);
    padding: 3px 8px;
    border-radius: 5px;
    margin-bottom: 10px;
    display: inline-block;
}

.featured-title {
    font-size: 20px;
    font-weight: bold;
    color: var(--text-primary);
    margin-bottom: 10px;
}

.featured-card:not(.main) .featured-title {
    font-size: 15px;
}

.featured-desc {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 15px;
}

.featured-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.featured-meta span {
    font-size: 13px;
    color: var(--text-muted);
}

.categories-section {
    padding: 60px 0;
}

.categories-grid {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 15px;
}

.category-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 20px;
    text-align: center;
    text-decoration: none;
    transition: all 0.3s ease;
}

.category-card:hover {
    border-color: var(--primary-color);
    transform: translateY(-5px);
}

.category-card.large {
    grid-column: span 3;
    padding: 30px;
}

.category-icon {
    font-size: 36px;
    margin-bottom: 10px;
}

.category-card.large .category-icon {
    font-size: 48px;
}

.category-name {
    display: block;
    font-size: 14px;
    color: var(--text-primary);
    font-weight: 600;
    margin-bottom: 5px;
}

.category-card.large .category-name {
    font-size: 20px;
}

.category-count {
    display: block;
    font-size: 12px;
    color: var(--text-muted);
}

.category-card.large .category-count {
    font-size: 14px;
}

.latest-section {
    padding: 60px 0;
}

.latest-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.video-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 15px;
    overflow: hidden;
    transition: all 0.3s ease;
}

.video-card:hover {
    transform: translateY(-5px);
    border-color: var(--primary-color);
}

.video-thumbnail {
    position: relative;
    height: 180px;
}

.video-thumbnail img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.video-duration {
    position: absolute;
    bottom: 10px;
    right: 10px;
    background: rgba(0, 0, 0, 0.8);
    color: white;
    padding: 3px 8px;
    border-radius: 5px;
    font-size: 12px;
    font-family: monospace;
}

.play-icon {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 50px;
    height: 50px;
    background: rgba(249, 115, 22, 0.8);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.video-card:hover .play-icon {
    opacity: 1;
}

.video-info {
    padding: 15px;
}

.video-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 10px;
    line-height: 1.4;
}

.video-meta {
    display: flex;
    gap: 15px;
    margin-bottom: 8px;
}

.video-meta span {
    font-size: 13px;
    color: var(--text-muted);
}

.video-date {
    font-size: 12px;
    color: var(--text-muted);
}

.popular-section {
    padding: 60px 0;
}

.popular-list {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.popular-item {
    display: flex;
    align-items: center;
    gap: 20px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 15px;
    padding: 20px;
    transition: all 0.3s ease;
}

.popular-item:hover {
    border-color: var(--primary-color);
}

.popular-rank {
    font-size: 32px;
    font-weight: bold;
    color: var(--primary-color);
    width: 40px;
    text-align: center;
}

.popular-thumbnail {
    width: 120px;
    height: 70px;
    border-radius: 10px;
    overflow: hidden;
}

.popular-thumbnail img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.popular-info {
    flex: 1;
}

.popular-title {
    font-size: 18px;
    font-weight: bold;
    color: var(--text-primary);
    margin-bottom: 10px;
}

.popular-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
}

.popular-meta span {
    font-size: 14px;
    color: var(--text-muted);
}

.banner-section {
    padding: 60px 0;
}

.banner-content {
    background: linear-gradient(135deg, rgba(249, 115, 22, 0.2) 0%, rgba(251, 146, 60, 0.2) 100%);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 40px;
    text-align: center;
}

.banner-content h2 {
    font-size: 28px;
    font-weight: bold;
    color: var(--text-primary);
    margin-bottom: 15px;
}

.banner-content p {
    font-size: 16px;
    color: var(--text-secondary);
    margin-bottom: 30px;
}

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

.footer {
    background: rgba(15, 23, 42, 0.95);
    border-top: 1px solid var(--border-color);
    padding: 50px 0 20px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
    margin-bottom: 30px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 15px;
}

.footer-section p {
    font-size: 14px;
    color: var(--text-muted);
    line-height: 1.6;
}

.footer-section h4 {
    font-size: 16px;
    font-weight: bold;
    color: var(--text-primary);
    margin-bottom: 15px;
}

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

.footer-section ul li {
    margin-bottom: 10px;
}

.footer-section ul li a {
    text-decoration: none;
    color: var(--text-muted);
    font-size: 14px;
    transition: color 0.3s ease;
}

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

.footer-bottom {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
}

.footer-bottom p {
    font-size: 13px;
    color: var(--text-muted);
}

.page-banner {
    padding: 60px 0;
    text-align: center;
}

.page-title {
    font-size: 42px;
    font-weight: bold;
    color: var(--text-primary);
    margin-bottom: 15px;
}

.page-desc {
    font-size: 18px;
    color: var(--text-secondary);
}

.filter-section {
    padding: 20px 0;
    border-bottom: 1px solid var(--border-color);
}

.filter-tabs {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    margin-bottom: 20px;
}

.filter-tab {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 10px 20px;
    border-radius: 20px;
    cursor: pointer;
    font-size: 14px;
    transition: all 0.3s ease;
}

.filter-tab:hover,
.filter-tab.active {
    border-color: var(--primary-color);
    color: var(--primary-color);
    background: rgba(249, 115, 22, 0.1);
}

.sort-options {
    display: inline-block;
}

.sort-select {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 10px 20px;
    border-radius: 10px;
    cursor: pointer;
    font-size: 14px;
}

.videos-section {
    padding: 60px 0;
}

.videos-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.pagination-section {
    padding: 30px 0;
    text-align: center;
}

.pagination {
    display: inline-flex;
    gap: 10px;
}

.page-btn {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 10px 15px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 14px;
    transition: all 0.3s ease;
}

.page-btn:hover,
.page-btn.active {
    border-color: var(--primary-color);
    color: var(--primary-color);
    background: rgba(249, 115, 22, 0.1);
}

.main-categories {
    padding: 60px 0;
}

.sub-category {
    padding: 40px 0;
    border-top: 1px solid var(--border-color);
}

.sub-categories {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 15px;
}

.sub-category-item {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 20px;
    text-decoration: none;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 15px;
}

.sub-category-item:hover {
    border-color: var(--primary-color);
    transform: translateY(-3px);
}

.sub-icon {
    font-size: 24px;
}

.sub-name {
    flex: 1;
    font-size: 15px;
    color: var(--text-primary);
    font-weight: 600;
}

.sub-count {
    font-size: 13px;
    color: var(--text-muted);
}

.tips-section {
    padding: 60px 0;
}

.tips-content {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.tip-item {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 15px;
    padding: 25px;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.tip-icon {
    font-size: 36px;
    margin-bottom: 15px;
}

.tip-text h3 {
    font-size: 16px;
    font-weight: bold;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.tip-text p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.5;
}

.about-section {
    padding: 60px 0;
}

.about-content {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 40px;
    align-items: center;
}

.about-image {
    border-radius: 20px;
    overflow: hidden;
}

.about-image img {
    width: 100%;
    height: 300px;
    object-fit: cover;
}

.about-text h2 {
    font-size: 32px;
    font-weight: bold;
    color: var(--text-primary);
    margin-bottom: 20px;
}

.about-text p {
    font-size: 16px;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 20px;
}

.about-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin-top: 30px;
}

.stat-box {
    text-align: center;
    background: rgba(249, 115, 22, 0.1);
    border-radius: 12px;
    padding: 20px;
}

.stat-value {
    display: block;
    font-size: 28px;
    font-weight: bold;
    color: var(--primary-color);
    margin-bottom: 5px;
}

.stat-label {
    display: block;
    font-size: 13px;
    color: var(--text-muted);
}

.mission-section {
    padding: 60px 0;
}

.mission-content {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.mission-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 15px;
    padding: 30px;
    text-align: center;
}

.mission-icon {
    font-size: 40px;
    margin-bottom: 15px;
}

.mission-card h3 {
    font-size: 18px;
    font-weight: bold;
    color: var(--text-primary);
    margin-bottom: 10px;
}

.mission-card p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.5;
}

.team-section {
    padding: 60px 0;
}

.team-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.team-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 15px;
    padding: 25px;
    text-align: center;
}

.team-avatar {
    font-size: 48px;
    margin-bottom: 15px;
}

.team-name {
    font-size: 16px;
    font-weight: bold;
    color: var(--text-primary);
    margin-bottom: 5px;
}

.team-title {
    font-size: 14px;
    color: var(--primary-color);
    margin-bottom: 10px;
}

.team-desc {
    font-size: 13px;
    color: var(--text-muted);
    line-height: 1.5;
}

.features-section {
    padding: 60px 0;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.feature-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 15px;
    padding: 25px;
    text-align: center;
}

.feature-icon {
    font-size: 36px;
    margin-bottom: 15px;
}

.feature-card h3 {
    font-size: 16px;
    font-weight: bold;
    color: var(--text-primary);
    margin-bottom: 10px;
}

.feature-card p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.5;
}

.partners-section {
    padding: 60px 0;
}

.partners-grid {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 20px;
}

.partner-item {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 25px;
    text-align: center;
    font-size: 15px;
    color: var(--text-secondary);
    font-weight: 600;
}

.contact-section {
    padding: 60px 0;
}

.contact-content {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 40px;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 25px;
}

.contact-item {
    display: flex;
    gap: 15px;
}

.contact-icon {
    font-size: 24px;
    color: var(--primary-color);
}

.contact-text h3 {
    font-size: 16px;
    font-weight: bold;
    color: var(--text-primary);
    margin-bottom: 5px;
}

.contact-text p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.5;
}

.contact-form {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 15px;
    padding: 30px;
}

.contact-form h3 {
    font-size: 18px;
    font-weight: bold;
    color: var(--text-primary);
    margin-bottom: 20px;
}

.form-input {
    width: 100%;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 12px 15px;
    margin-bottom: 15px;
    color: var(--text-primary);
    font-size: 14px;
}

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

.form-textarea {
    width: 100%;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 12px 15px;
    margin-bottom: 20px;
    color: var(--text-primary);
    font-size: 14px;
    resize: vertical;
    min-height: 100px;
}

.form-textarea::placeholder {
    color: var(--text-muted);
}

@media (max-width: 1024px) {
    .featured-grid {
        grid-template-columns: 1fr;
    }
    .categories-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    .category-card.large {
        grid-column: span 3;
    }
    .latest-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .videos-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    .sub-categories {
        grid-template-columns: repeat(3, 1fr);
    }
    .team-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .partners-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    .about-content {
        grid-template-columns: 1fr;
    }
    .contact-content {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .header-inner {
        flex-direction: column;
        gap: 15px;
    }
    .main-nav {
        gap: 20px;
    }
    .hero-title {
        font-size: 36px;
    }
    .hero-stats {
        gap: 30px;
    }
    .categories-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .category-card.large {
        grid-column: span 2;
    }
    .latest-grid {
        grid-template-columns: 1fr;
    }
    .videos-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .sub-categories {
        grid-template-columns: repeat(2, 1fr);
    }
    .tips-content {
        grid-template-columns: 1fr;
    }
    .mission-content {
        grid-template-columns: 1fr;
    }
    .team-grid {
        grid-template-columns: 1fr;
    }
    .features-grid {
        grid-template-columns: 1fr;
    }
    .partners-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .footer-content {
        grid-template-columns: repeat(2, 1fr);
    }
}