.video-card { background: #fff; border-radius: 8px; overflow: hidden; box-shadow: 0 2px 8px rgba(0,0,0,0.1); transition: transform 0.3s, box-shadow 0.3s; margin-bottom: 20px; } .video-card:hover { transform: translateY(-5px); box-shadow: 0 4px 16px rgba(0,0,0,0.2); } .video-card-title { font-size: 1.2rem; font-weight: 600; margin: 15px; color: #333; } .video-card-meta { padding: 0 15px 10px; font-size: 0.9rem; color: #666; } .video-card-summary { padding: 0 15px 15px; line-height: 1.6; color: #555; } .video-card-link { display: inline-block; margin: 0 15px 15px; padding: 8px 20px; background: #0099FF; color: #fff; text-decoration: none; border-radius: 4px; transition: background 0.3s; } .video-card-link:hover { background: #0077CC; }  .video-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 20px; padding: 20px 0; }  .section { margin: 40px 0; padding: 30px; background: #f9f9f9; border-radius: 8px; } .section-title { font-size: 1.8rem; font-weight: 700; margin-bottom: 20px; color: #222; border-left: 5px solid #0099FF; padding-left: 15px; } .section-desc { line-height: 1.8; color: #555; margin-bottom: 20px; }  .tags { display: flex; flex-wrap: wrap; gap: 8px; margin: 10px 0; } .tag { display: inline-block; padding: 4px 12px; background: #e8f4ff; color: #0099FF; border-radius: 3px; font-size: 0.85rem; }  .breadcrumb { padding: 15px 0; font-size: 0.9rem; color: #888; margin-bottom: 20px; } .breadcrumb a { color: #0099FF; text-decoration: none; } .breadcrumb a:hover { text-decoration: underline; } .breadcrumb-sep { margin: 0 8px; color: #ccc; }  .detail-header { background: linear-gradient(135deg, #667eea 0%, #764ba2 100%); color: #fff; padding: 60px 0 40px; margin-bottom: 40px; } .detail-title { font-size: 2.5rem; font-weight: 700; margin-bottom: 20px; } .detail-meta { font-size: 1rem; opacity: 0.95; } .detail-body { max-width: 900px; margin: 0 auto; line-height: 1.8; } .detail-body h2 { font-size: 1.6rem; margin: 30px 0 15px; color: #333; } .detail-body p { margin-bottom: 15px; color: #555; }  .btn { display: inline-block; padding: 10px 24px; background: #0099FF; color: #fff; text-decoration: none; border-radius: 4px; transition: all 0.3s; border: none; cursor: pointer; font-size: 1rem; } .btn:hover { background: #0077CC; transform: translateY(-2px); } .btn-secondary { background: #6c757d; } .btn-secondary:hover { background: #5a6268; }  @media (max-width: 768px) { .video-grid { grid-template-columns: 1fr; } .section { padding: 20px 15px; } .detail-title { font-size: 2rem; } }  .text-center { text-align: center; } .mt-1 { margin-top: 10px; } .mt-2 { margin-top: 20px; } .mt-3 { margin-top: 30px; } .mb-1 { margin-bottom: 10px; } .mb-2 { margin-bottom: 20px; } .mb-3 { margin-bottom: 30px; } .collapsed { max-height: 100px; overflow: hidden; position: relative; } .collapsed::after { content: '...'; position: absolute; bottom: 0; right: 0; background: #fff; padding-left: 10px; }