/* 主体样式 */
.main { min-height: calc(100vh - 200px); padding: 2rem 0; }
.hero { text-align: center; padding: 3rem 0; background: white; border-radius: 8px; margin-bottom: 2rem; box-shadow: 0 2px 8px rgba(0,0,0,0.05); }
.hero h1 { font-size: 2rem; color: #2c3e50; margin-bottom: 1rem; line-height: 1.4; }
.hero .intro { font-size: 1.05rem; color: #555; max-width: 900px; margin: 0 auto; line-height: 1.8; }
.section { margin: 3rem 0; }
.section h2 { font-size: 1.8rem; margin-bottom: 1.5rem; color: #2c3e50; border-left: 4px solid #667eea; padding-left: 1rem; }

/* 视频网格 */
.video-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 1.5rem; }
.video-card { background: white; padding: 1.5rem; border-radius: 8px; box-shadow: 0 2px 8px rgba(0,0,0,0.05); transition: transform 0.3s, box-shadow 0.3s; }
.video-card:hover { transform: translateY(-4px); box-shadow: 0 4px 16px rgba(0,0,0,0.1); }
.video-card h3 { font-size: 1.2rem; margin-bottom: 0.5rem; }
.video-card .meta { color: #7f8c8d; font-size: 0.9rem; margin-bottom: 0.5rem; }
.video-card .desc { color: #555; font-size: 0.95rem; line-height: 1.6; }

/* 列表页 */
.page-intro { font-size: 1.05rem; color: #555; margin: 1.5rem 0 2rem; padding: 1rem; background: #f8f9fa; border-radius: 6px; line-height: 1.8; }
.list-container { background: white; border-radius: 8px; padding: 1.5rem; box-shadow: 0 2px 8px rgba(0,0,0,0.05); }
.list-item { display: flex; padding: 1.5rem 0; border-bottom: 1px solid #ecf0f1; }
.list-item:last-child { border-bottom: none; }
.list-item .rank { font-size: 2rem; font-weight: bold; color: #667eea; width: 60px; flex-shrink: 0; }
.list-item .item-content { flex: 1; }
.list-item h3 { font-size: 1.3rem; margin-bottom: 0.5rem; }
.list-item .meta { color: #7f8c8d; font-size: 0.9rem; margin-bottom: 0.5rem; }
.list-item .desc { color: #555; line-height: 1.6; }
.list-item .date { color: #95a5a6; font-size: 0.85rem; margin-top: 0.5rem; }

/* 详情页 */
.detail { background: white; padding: 2.5rem; border-radius: 8px; box-shadow: 0 2px 8px rgba(0,0,0,0.05); }
.detail h1 { font-size: 2.2rem; color: #2c3e50; margin-bottom: 2rem; padding-bottom: 1rem; border-bottom: 2px solid #667eea; }
.detail section { margin: 2rem 0; }
.detail h2 { font-size: 1.5rem; color: #34495e; margin-bottom: 1rem; }
.info-list { list-style: none; }
.info-list li { padding: 0.5rem 0; font-size: 1rem; color: #555; }
.info-list strong { color: #2c3e50; display: inline-block; width: 100px; }
.highlight { font-size: 1.2rem; color: #667eea; font-weight: 500; padding: 1rem; background: #f8f9fa; border-left: 4px solid #667eea; }
.summary { font-size: 1.05rem; line-height: 1.9; color: #444; text-align: justify; }
.review { font-size: 1.05rem; line-height: 1.8; color: #555; font-style: italic; padding: 1rem; background: #f8f9fa; border-radius: 6px; }
.related-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 1rem; }
.related-card { padding: 1rem; background: #f8f9fa; border-radius: 6px; transition: background 0.3s; }
.related-card:hover { background: #e9ecef; }
.related-card h4 { font-size: 1.1rem; margin-bottom: 0.5rem; }
.related-card .desc { font-size: 0.9rem; color: #666; }

/* 页脚 */
.footer { background: #2c3e50; color: white; text-align: center; padding: 2rem 0; margin-top: 3rem; }
.footer p { font-size: 0.9rem; }

/* 响应式 */
@media (max-width: 768px) {
  .hero h1 { font-size: 1.5rem; }
  .hero .intro { font-size: 0.95rem; }
  .video-grid { grid-template-columns: 1fr; }
  .detail { padding: 1.5rem; }
  .detail h1 { font-size: 1.8rem; }
  .list-item { flex-direction: column; }
  .list-item .rank { margin-bottom: 0.5rem; }
}