* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji"; line-height: 1.6; color: #333; background: #f5f5f5; }
a { color: #0066cc; text-decoration: none; transition: color 0.3s; }
a:hover { color: #004499; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
header { background: #fff; border-bottom: 1px solid #e0e0e0; position: sticky; top: 0; z-index: 100; box-shadow: 0 2px 4px rgba(0,0,0,0.05); }
.header-content { display: flex; justify-content: space-between; align-items: center; padding: 15px 20px; }
.logo { font-size: 24px; font-weight: bold; color: #0066cc; }
nav ul { display: flex; flex-wrap: nowrap; list-style: none; gap: 8px; }
nav a { padding: 8px 16px; border-radius: 4px; display: block; white-space: nowrap; }
nav a:hover { background: #f0f0f0; }
main { padding: 40px 0; }
.page-title { font-size: 32px; margin-bottom: 16px; color: #222; }
.page-intro { font-size: 16px; color: #666; margin-bottom: 40px; line-height: 1.8; max-width: 800px; }
.section { background: #fff; padding: 30px; margin-bottom: 30px; border-radius: 8px; box-shadow: 0 1px 3px rgba(0,0,0,0.08); }
.section-title { font-size: 24px; margin-bottom: 20px; padding-bottom: 12px; border-bottom: 2px solid #0066cc; color: #222; }
.video-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 24px; }
.video-card { background: #fafafa; padding: 20px; border-radius: 6px; border: 1px solid #e8e8e8; transition: all 0.3s; }
.video-card:hover { box-shadow: 0 4px 12px rgba(0,0,0,0.1); transform: translateY(-2px); }
.video-title { font-size: 18px; font-weight: 600; margin-bottom: 10px; color: #222; }
.video-meta { font-size: 14px; color: #888; margin-bottom: 8px; }
.video-desc { font-size: 14px; color: #666; line-height: 1.6; margin-bottom: 12px; }
.video-link { display: inline-block; padding: 8px 16px; background: #0066cc; color: #fff; border-radius: 4px; font-size: 14px; }
.video-link:hover { background: #004499; color: #fff; }
.detail-header { margin-bottom: 30px; }
.detail-title { font-size: 36px; margin-bottom: 16px; color: #222; }
.detail-meta { display: flex; flex-wrap: wrap; gap: 20px; margin-bottom: 20px; font-size: 15px; color: #666; }
.detail-section { margin-bottom: 30px; }
.detail-section h2 { font-size: 22px; margin-bottom: 16px; color: #222; border-left: 4px solid #0066cc; padding-left: 12px; }
.detail-section p { line-height: 1.8; color: #555; margin-bottom: 12px; }
.tags { display: flex; flex-wrap: wrap; gap: 8px; }
.tag { display: inline-block; padding: 4px 12px; background: #e8f4ff; color: #0066cc; border-radius: 4px; font-size: 13px; }
footer { background: #333; color: #fff; padding: 30px 0; text-align: center; margin-top: 60px; }
@media (max-width: 768px) {
  .header-content { flex-direction: column; gap: 12px; padding: 12px 15px; }
  .logo { font-size: 20px; }
  nav ul { justify-content: space-between; width: 100%; gap: 4px; }
  nav a { padding: 6px 8px; font-size: 13px; overflow: hidden; text-overflow: ellipsis; }
  .video-grid { grid-template-columns: 1fr; gap: 16px; }
  .page-title { font-size: 24px; }
  .section { padding: 20px 15px; }
  main { padding: 20px 0; }
}