/* UI Style 4 - Layout E */
body.ui-style-4 { /* 基础样式已在head内联 */ }
.video-card { transition: all 0.3s ease; }
.video-card:hover { border-color: #2563eb; }
button { background: #2563eb; color: white; border: none; padding: 0.5rem 1rem; border-radius: 4px; cursor: pointer; }
button:hover { background: #1d4ed8; }