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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background: #f8f9fa;
}

a {
    text-decoration: none;
    color: inherit;
    transition: all 0.3s ease;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px;
}

.header {
    background: linear-gradient(135deg, #1e3c72 0%, #2a5298 100%);
    color: white;
    padding: 20px 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 20px;
}

.logo {
    font-size: 28px;
    font-weight: 700;
    margin: 0;
}

.logo a {
    color: white;
}

.logo a:hover {
    opacity: 0.9;
}

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

.nav-link {
    color: white;
    font-size: 16px;
    font-weight: 500;
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: white;
    transition: width 0.3s ease;
}

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

.search-box {
    display: flex;
    gap: 10px;
}

.search-input {
    padding: 10px 15px;
    border: none;
    border-radius: 25px;
    width: 250px;
    font-size: 14px;
    outline: none;
}

.search-btn {
    padding: 10px 25px;
    background: #ff6b6b;
    color: white;
    border: none;
    border-radius: 25px;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.3s ease;
}

.search-btn:hover {
    background: #ff5252;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(255, 107, 107, 0.3);
}

.hero {
    position: relative;
    height: 500px;
    overflow: hidden;
}

.hero-slider {
    position: relative;
    width: 100%;
    height: 100%;
}

.hero-slide {
    position: absolute;
    width: 100%;
    height: 100%;
    background-size: cover;
    background-position: center;
    opacity: 0;
    transition: opacity 1s ease-in-out;
}

.hero-slide::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(to right, rgba(0,0,0,0.7) 0%, rgba(0,0,0,0.3) 100%);
}

.hero-slide.active {
    opacity: 1;
}

.hero-content {
    position: relative;
    z-index: 10;
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    color: white;
}

.hero-title {
    font-size: 48px;
    font-weight: 700;
    margin-bottom: 15px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
}

.hero-desc {
    font-size: 20px;
    margin-bottom: 30px;
    max-width: 600px;
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.5);
}

.hero-btn {
    padding: 15px 40px;
    background: #ff6b6b;
    color: white;
    border: none;
    border-radius: 30px;
    font-size: 18px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    width: fit-content;
}

.hero-btn:hover {
    background: #ff5252;
    transform: translateY(-3px);
    box-shadow: 0 10px 25px rgba(255, 107, 107, 0.4);
}

.hero-controls {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 15px;
    z-index: 20;
}

.hero-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.5);
    cursor: pointer;
    transition: all 0.3s ease;
}

.hero-dot.active {
    background: white;
    width: 30px;
    border-radius: 6px;
}

.main {
    padding: 60px 0;
}

.section {
    margin-bottom: 60px;
}

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

.section-title {
    font-size: 32px;
    font-weight: 700;
    color: #2c3e50;
    position: relative;
    padding-left: 15px;
}

.section-title::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 5px;
    height: 30px;
    background: linear-gradient(135deg, #1e3c72 0%, #2a5298 100%);
    border-radius: 3px;
}

.section-title.center {
    text-align: center;
    padding-left: 0;
    margin-bottom: 40px;
}

.section-title.center::before {
    display: none;
}

.section-more {
    color: #1e3c72;
    font-weight: 600;
    font-size: 16px;
}

.section-more:hover {
    color: #ff6b6b;
}

.video-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 25px;
}

.video-card {
    background: white;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    transition: all 0.3s ease;
    cursor: pointer;
}

.video-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
}

.video-thumb {
    position: relative;
    width: 100%;
    padding-bottom: 140%;
    overflow: hidden;
}

.video-thumb img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.video-card:hover .video-thumb img {
    transform: scale(1.1);
}

.video-mask {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.6);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.video-card:hover .video-mask {
    opacity: 1;
}

.play-btn {
    padding: 12px 30px;
    background: #ff6b6b;
    color: white;
    border: none;
    border-radius: 25px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.play-btn:hover {
    background: #ff5252;
    transform: scale(1.05);
}

.video-tag {
    position: absolute;
    top: 10px;
    right: 10px;
    padding: 5px 12px;
    background: rgba(255, 107, 107, 0.9);
    color: white;
    border-radius: 15px;
    font-size: 12px;
    font-weight: 600;
}

.video-tag.update {
    background: rgba(52, 152, 219, 0.9);
}

.video-tag.hot {
    background: rgba(255, 87, 34, 0.9);
}

.video-title {
    padding: 15px 15px 5px;
    font-size: 16px;
    font-weight: 600;
    color: #2c3e50;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.video-meta {
    padding: 0 15px 15px;
    font-size: 13px;
    color: #7f8c8d;
}

.features {
    background: white;
    padding: 60px 0;
    margin: 80px 0;
    border-radius: 20px;
}

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

.feature-card {
    text-align: center;
    padding: 30px;
    border-radius: 15px;
    background: #f8f9fa;
    transition: all 0.3s ease;
}

.feature-card:hover {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(102, 126, 234, 0.3);
}

.feature-icon {
    width: 70px;
    height: 70px;
    margin: 0 auto 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #1e3c72 0%, #2a5298 100%);
    border-radius: 50%;
    color: white;
}

.feature-card:hover .feature-icon {
    background: white;
    color: #667eea;
}

.feature-icon svg {
    width: 35px;
    height: 35px;
}

.feature-title {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 15px;
    color: #2c3e50;
}

.feature-card:hover .feature-title {
    color: white;
}

.feature-desc {
    font-size: 14px;
    line-height: 1.8;
    color: #7f8c8d;
}

.feature-card:hover .feature-desc {
    color: rgba(255, 255, 255, 0.9);
}

.comments-section {
    background: white;
    padding: 60px 0;
    border-radius: 20px;
    margin-bottom: 60px;
}

.comments-container {
    max-width: 900px;
    margin: 0 auto;
}

.comment-card {
    background: #f8f9fa;
    padding: 25px;
    border-radius: 15px;
    margin-bottom: 20px;
    transition: all 0.3s ease;
}

.comment-card:hover {
    transform: translateX(10px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

.comment-header {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-bottom: 15px;
}

.comment-avatar {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 20px;
    font-weight: 600;
}

.comment-info {
    flex: 1;
}

.comment-author {
    font-size: 16px;
    font-weight: 600;
    color: #2c3e50;
    margin-bottom: 3px;
}

.comment-date {
    font-size: 13px;
    color: #95a5a6;
}

.comment-rating {
    display: flex;
    gap: 3px;
}

.star {
    color: #ffd700;
    font-size: 16px;
}

.comment-text {
    font-size: 15px;
    line-height: 1.8;
    color: #555;
}

.about-section {
    background: white;
    padding: 60px 0;
    border-radius: 20px;
}

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

.about-content p {
    font-size: 16px;
    line-height: 2;
    color: #555;
    margin-bottom: 20px;
    text-indent: 2em;
}

.footer {
    background: #2c3e50;
    color: white;
    padding: 60px 0 30px;
    margin-top: 80px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-title {
    font-size: 24px;
    margin-bottom: 15px;
}

.footer-title a {
    color: white;
}

.footer-desc {
    font-size: 14px;
    line-height: 1.8;
    color: rgba(255, 255, 255, 0.7);
}

.footer-heading {
    font-size: 18px;
    margin-bottom: 20px;
    font-weight: 600;
}

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

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

.footer-links a {
    color: rgba(255, 255, 255, 0.7);
    font-size: 14px;
    transition: all 0.3s ease;
}

.footer-links a:hover {
    color: #ff6b6b;
    padding-left: 5px;
}

.footer-bottom {
    padding-top: 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
}

.footer-bottom p {
    font-size: 13px;
    color: rgba(255, 255, 255, 0.6);
    line-height: 1.8;
}

@media (max-width: 1024px) {
    .hero-title {
        font-size: 36px;
    }

    .hero-desc {
        font-size: 16px;
    }

    .video-grid {
        grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
        gap: 20px;
    }
}

@media (max-width: 768px) {
    .header .container {
        flex-direction: column;
        align-items: flex-start;
    }

    .nav {
        gap: 15px;
    }

    .search-box {
        width: 100%;
    }

    .search-input {
        flex: 1;
        width: auto;
    }

    .hero {
        height: 400px;
    }

    .hero-title {
        font-size: 28px;
    }

    .hero-desc {
        font-size: 14px;
    }

    .section-title {
        font-size: 24px;
    }

    .video-grid {
        grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
        gap: 15px;
    }

    .features-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
}

@media (max-width: 480px) {
    .hero {
        height: 300px;
    }

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