/* 视频页面样式 */
:root {
    --primary-color: #00f0ff;
    --secondary-color: #8b00ff;
    --accent-color: #ff003c;
    --dark-bg: #0c0c14;
    --darker-bg: #080810;
    --card-bg: rgba(16, 16, 30, 0.6);
    --text-color: #e6e6ff;
    --text-secondary: #9393b8;
    --success-color: #00ff66;
    --glow-shadow: 0 0 10px rgba(0, 240, 255, 0.5);
    --border-glow: 1px solid rgba(0, 240, 255, 0.2);
}

.videos-main {
    min-height: 80vh;
    padding: 2rem 0;
    background-color: var(--dark-bg);
    position: relative;
}

.videos-main::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at 50% 50%, rgba(16, 16, 40, 0.8), var(--darker-bg)),
                url('data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIxMDAiIGhlaWdodD0iMTAwIj48cmVjdCB4PSIwIiB5PSIwIiB3aWR0aD0iMTAwIiBoZWlnaHQ9IjEwMCIgZmlsbD0ibm9uZSIgc3Ryb2tlPSJyZ2JhKDAsIDI0MCwgMjU1LCAwLjA1KSIgc3Ryb2tlLXdpZHRoPSIxIi8+PC9zdmc+');
    z-index: -1;
}

.videos-header {
    text-align: center;
    margin-bottom: 3rem;
    color: var(--text-color);
}

/* 视频筛选器样式 */
.video-filters {
    margin-top: 2rem;
    display: flex;
    justify-content: center;
    gap: 1rem;
}

.video-categories {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    justify-content: center;
}

.category-btn {
    padding: 0.5rem 1rem;
    background: var(--card-bg);
    color: var(--text-color);
    text-decoration: none;
    border-radius: 20px;
    border: 1px solid rgba(0, 240, 255, 0.2);
    transition: all 0.3s ease;
    font-size: 0.9rem;
    backdrop-filter: blur(10px);
}

.category-btn:hover,
.category-btn.active {
    background: linear-gradient(45deg, var(--primary-color), var(--secondary-color));
    color: var(--dark-bg);
    transform: translateY(-2px);
    box-shadow: 0 0 15px rgba(0, 240, 255, 0.5);
    border-color: var(--primary-color);
}

.videos-header h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    font-weight: 700;
    color: var(--primary-color);
    text-shadow: var(--glow-shadow);
}

.videos-header p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* 视频网格 */
.videos-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.video-card {
    background: var(--card-bg);
    border-radius: 12px;
    overflow: hidden;
    border: var(--border-glow);
    backdrop-filter: blur(10px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.3);
    transition: all 0.3s ease;
    cursor: pointer;
}

.video-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--glow-shadow), 0 15px 35px rgba(0, 0, 0, 0.4);
    border-color: var(--primary-color);
}

/* 视频缩略图 */
.video-thumbnail {
    position: relative;
    width: 100%;
    height: 200px;
    overflow: hidden;
    background: var(--darker-bg);
}

.video-thumbnail img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

.video-card:hover .video-thumbnail img {
    transform: scale(1.05);
}

.default-thumbnail {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--text-color);
    font-size: 3rem;
}

/* 播放按钮覆盖层 */
.play-overlay {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 60px;
    height: 60px;
    background: rgba(0, 240, 255, 0.2);
    border: 2px solid var(--primary-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-color);
    font-size: 1.5rem;
    opacity: 0;
    transition: opacity 0.3s ease;
    backdrop-filter: blur(10px);
}

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

/* 推荐标签 */
.featured-badge {
    position: absolute;
    top: 10px;
    right: 10px;
    background: var(--accent-color);
    color: var(--text-color);
    padding: 4px 8px;
    border-radius: 12px;
    font-size: 0.8rem;
    font-weight: 600;
    box-shadow: var(--glow-shadow);
}

/* 视频信息 */
.video-info {
    padding: 1.5rem;
}

.video-info h3 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-color);
    line-height: 1.4;
}

.video-description {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.5;
    margin-bottom: 1rem;
}

/* 视频元数据 */
.video-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.video-meta span {
    background: rgba(0, 240, 255, 0.1);
    color: var(--text-secondary);
    padding: 4px 8px;
    border-radius: 12px;
    font-size: 0.8rem;
    font-weight: 500;
    border: 1px solid rgba(0, 240, 255, 0.2);
}

.video-meta .category {
    background: rgba(0, 240, 255, 0.15);
    color: var(--primary-color);
    border-color: var(--primary-color);
}

.video-meta .difficulty {
    background: rgba(139, 0, 255, 0.15);
    color: var(--secondary-color);
    border-color: var(--secondary-color);
}

.video-meta .duration {
    background: rgba(0, 255, 102, 0.15);
    color: var(--success-color);
    border-color: var(--success-color);
}

/* 视频统计 */
.video-stats {
    display: flex;
    gap: 1rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.video-stats span {
    display: flex;
    align-items: center;
    gap: 0.3rem;
}

/* 空状态 */
.empty-state {
    text-align: center;
    padding: 4rem 2rem;
    color: var(--text-color);
}

.empty-icon {
    font-size: 4rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
    opacity: 0.7;
}

.empty-state h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--text-color);
}

.empty-state p {
    font-size: 1rem;
    color: var(--text-secondary);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .videos-main {
        padding: 1rem 0;
    }
    
    .videos-header h1 {
        font-size: 2rem;
    }
    
    .videos-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
        margin-top: 1.5rem;
    }
    
    .video-thumbnail {
        height: 180px;
    }
    
    .video-info {
        padding: 1rem;
    }
}

@media (max-width: 480px) {
    .videos-header h1 {
        font-size: 1.8rem;
    }
    
    .video-thumbnail {
        height: 160px;
    }
    
    .play-overlay {
        width: 50px;
        height: 50px;
        font-size: 1.2rem;
    }
}