/* 分类导航 */
.category-nav {
    background: #fff;
    padding: 20px 0;
    border-radius: 12px;
    margin-bottom: 30px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.05);
}

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

.category-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 20px;
    background: linear-gradient(135deg, #f8f9fa, #e9ecef);
    border-radius: 12px;
    text-decoration: none;
    color: #333;
    transition: all 0.3s ease;
}


.category-item:hover {
    transform: translateY(-3px);
    background: linear-gradient(135deg, #4ecdc4, #44a08d);
    color: #fff;
}

.category-icon {
    font-size: 32px;
    margin-bottom: 10px;
}

.category-name {
    font-size: 14px;
    font-weight: 600;
}

/* 视频标签 */
.video-card-tag {
    position: absolute;
    top: 10px;
    left: 10px;
    background: #e74c3c;
    color: #fff;
    padding: 4px 10px;
    border-radius: 4px;
    font-size: 11px;
    font-weight: 600;
}

/* 布局2: 大图展示 */
.section-large {
    margin-bottom: 40px;
}

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

.main-video {
    background: #1a1a2e;
    border-radius: 12px;
    overflow: hidden;
}

.main-video-link {
    text-decoration: none;
    color: inherit;
}

.main-video-image {
    position: relative;
    padding-top: 56.25%;
    overflow: hidden;
}

.main-video-image img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.main-video-image .play-big {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 60px;
    height: 60px;
    background: rgba(0,0,0,0.6);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 24px;
}

.main-video-image .video-tag {
    position: absolute;
    top: 15px;
    left: 15px;
    background: #e94560;
    color: #fff;
    padding: 5px 12px;
    border-radius: 6px;
    font-size: 12px;
}

.main-video h3 {
    padding: 15px;
    font-size: 16px;
    color: #e0e0e0;
}

.side-videos {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.side-video-item {
    display: flex;
    gap: 12px;
    text-decoration: none;
    color: inherit;
    background: #1a1a2e;
    border-radius: 8px;
    overflow: hidden;
    padding: 10px;
    transition: all 0.3s;
}

.side-video-item:hover {
    background: #252542;
    transform: translateX(5px);
}

.side-video-item img {
    width: 120px;
    height: 70px;
    object-fit: cover;
    border-radius: 4px;
}

.side-video-info {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.side-video-info h4 {
    font-size: 13px;
    color: #e0e0e0;
    margin-bottom: 8px;
    line-height: 1.4;
}

.side-video-info span {
    font-size: 11px;
    color: #888;
}

/* 布局3: 列表模式 */
.section-list {
    margin-bottom: 40px;
}

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

.list-item {
    display: flex;
    gap: 20px;
    padding: 15px;
    background: #1a1a2e;
    border-radius: 10px;
    text-decoration: none;
    color: inherit;
    transition: all 0.3s;
}

.list-item:hover {
    background: #252542;
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(0,0,0,0.3);
}

.list-thumb {
    position: relative;
    width: 200px;
    height: 120px;
    flex-shrink: 0;
    border-radius: 8px;
    overflow: hidden;
}

.list-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.list-thumb .list-play {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 40px;
    height: 40px;
    background: rgba(0,0,0,0.6);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
}

.list-info {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.list-info h3 {
    font-size: 16px;
    color: #e0e0e0;
    margin-bottom: 12px;
    line-height: 1.5;
}

.list-meta {
    display: flex;
    gap: 15px;
    align-items: center;
}

.list-category {
    background: #e94560;
    color: #fff;
    padding: 4px 10px;
    border-radius: 4px;
    font-size: 12px;
}

.list-meta span:last-child {
    font-size: 12px;
    color: #888;
}

/* 响应式设计 - 新布局 */
@media (max-width: 768px) {
    .large-layout {
        grid-template-columns: 1fr;
    }
    
    .list-item {
        flex-direction: column;
        gap: 15px;
    }
    
    .list-thumb {
        width: 100%;
        height: 200px;
    }
    
    .side-video-item {
        padding: 8px;
    }
    
    .side-video-item img {
        width: 100px;
        height: 60px;
    }
}

@media (max-width: 480px) {
    .list-thumb {
        height: 180px;
    }
    
    .list-info h3 {
        font-size: 14px;
    }
    
    .main-video-image .play-big {
        width: 45px;
        height: 45px;
        font-size: 18px;
    }
}