/* 全局样式增强 */
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

.video-card:hover { transform: translateY(-5px); box-shadow: 0 4px 20px rgba(0,0,0,0.12); }

.video-grid a:hover { color: #e53935; }

footer { background: linear-gradient(135deg, #333 0%, #444 100%); }

/* 响应式优化 */
@media (max-width: 768px) {
  .hero h1 { font-size: 22px !important; }
  .hero p { font-size: 14px !important; }
  .video-grid { grid-template-columns: 1fr !important; }
  main.container { padding: 0 15px !important; }
  section { margin-bottom: 30px !important; }
}

/* UI样式变体 */
.ui-style-0 { --primary-color: #e53935; }
.ui-style-1 { --primary-color: #1976d2; }
.ui-style-2 { --primary-color: #388e3c; }
.ui-style-3 { --primary-color: #7b1fa2; }
.ui-style-4 { --primary-color: #f57c00; }
.ui-style-5 { --primary-color: #0097a7; }
.ui-style-6 { --primary-color: #c2185b; }
.ui-style-7 { --primary-color: #5d4037; }
.ui-style-8 { --primary-color: #455a64; }
.ui-style-9 { --primary-color: #d32f2f; }
.ui-style-10 { --primary-color: #303f9f; }
.ui-style-11 { --primary-color: #00796b; }
.ui-style-12 { --primary-color: #6a1b9a; }
.ui-style-13 { --primary-color: #e64a19; }
.ui-style-14 { --primary-color: #0288d1; }
.ui-style-15 { --primary-color: #8e24aa; }

/* 平滑过渡 */
* { transition: color 0.2s ease, background-color 0.2s ease; }
a { transition: all 0.3s ease; }