.hero { background: linear-gradient(135deg, #667eea 0%, #764ba2 100%); color: white; padding: 60px 20px; text-align: center; }
.hero h1 { font-size: 32px; margin-bottom: 20px; line-height: 1.4; }
.hero .intro { font-size: 16px; line-height: 1.8; max-width: 900px; margin: 0 auto; opacity: 0.95; }

.section { padding: 50px 20px; }
.section h2 { font-size: 28px; margin-bottom: 30px; color: #1e40af; }
.alt-bg { background: white; }

.video-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 20px; }
.video-card { background: white; padding: 20px; border-radius: 8px; box-shadow: 0 2px 8px rgba(0,0,0,0.1); transition: transform 0.3s; }
.video-card:hover { transform: translateY(-4px); box-shadow: 0 4px 12px rgba(0,0,0,0.15); }
.video-card h3 { font-size: 18px; margin-bottom: 10px; }
.video-card .meta { color: #666; font-size: 14px; margin-bottom: 10px; }
.video-card .desc { font-size: 14px; color: #444; line-height: 1.6; }

.video-list { display: flex; flex-direction: column; gap: 15px; }
.video-item { background: white; padding: 15px 20px; border-radius: 6px; display: flex; justify-content: space-between; align-items: center; gap: 15px; }
.video-item h4 { font-size: 16px; flex: 1; }
.video-item .year { color: #666; font-size: 14px; min-width: 50px; }
.video-item p { font-size: 13px; color: #666; flex: 2; }

.quick-links { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 20px; }
.link-card { background: white; padding: 30px; border-radius: 8px; box-shadow: 0 2px 8px rgba(0,0,0,0.1); transition: all 0.3s; }
.link-card:hover { transform: scale(1.05); box-shadow: 0 4px 16px rgba(0,0,0,0.2); }
.link-card h3 { font-size: 20px; margin-bottom: 10px; color: #2563eb; }
.link-card p { font-size: 14px; color: #666; }

.more-link { text-align: center; margin-top: 30px; font-size: 16px; }

.page-header { background: linear-gradient(135deg, #667eea 0%, #764ba2 100%); color: white; padding: 50px 20px; text-align: center; }
.page-header h1 { font-size: 36px; margin-bottom: 15px; }
.page-header p { font-size: 16px; opacity: 0.9; max-width: 800px; margin: 0 auto; }

.list-section { padding: 40px 20px; }
.video-list-grid { display: flex; flex-direction: column; gap: 20px; }

.list-card { background: white; padding: 20px; border-radius: 8px; box-shadow: 0 2px 8px rgba(0,0,0,0.08); }
.list-card .card-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 10px; }
.list-card h3 { font-size: 20px; }
.list-card .badge { background: #2563eb; color: white; padding: 4px 12px; border-radius: 12px; font-size: 12px; }
.list-card .meta { color: #666; font-size: 14px; margin-bottom: 10px; }
.list-card .summary { font-size: 15px; line-height: 1.6; margin-bottom: 10px; color: #444; }
.list-card .tags { display: flex; gap: 8px; flex-wrap: wrap; }
.list-card .tag { background: #f3f4f6; padding: 4px 10px; border-radius: 4px; font-size: 12px; color: #555; }

.rank-card { background: white; padding: 20px; border-radius: 8px; display: flex; gap: 20px; align-items: flex-start; box-shadow: 0 2px 8px rgba(0,0,0,0.08); }
.rank-num { font-size: 32px; font-weight: bold; color: #2563eb; min-width: 50px; }
.rank-content h3 { font-size: 18px; margin-bottom: 8px; }
.rank-content .meta { color: #666; font-size: 14px; margin-bottom: 8px; }
.rank-content p { font-size: 14px; color: #444; line-height: 1.6; margin-bottom: 8px; }
.rank-content .review { font-style: italic; color: #666; font-size: 13px; }

.topic-section { padding: 40px 20px; }
.topic-group { margin-bottom: 40px; background: white; padding: 30px; border-radius: 8px; box-shadow: 0 2px 8px rgba(0,0,0,0.08); }
.topic-group h3 { font-size: 24px; margin-bottom: 20px; color: #2563eb; border-left: 4px solid #2563eb; padding-left: 15px; }
.topic-list { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 15px; }
.topic-item { padding: 15px; background: #f9fafb; border-radius: 6px; transition: background 0.3s; }
.topic-item:hover { background: #e5e7eb; }
.topic-item h4 { font-size: 16px; margin-bottom: 8px; }
.topic-item p { font-size: 14px; color: #666; }

.latest-card { background: white; padding: 20px; border-radius: 8px; display: flex; gap: 20px; box-shadow: 0 2px 8px rgba(0,0,0,0.08); }
.date-badge { background: #2563eb; color: white; padding: 10px 15px; border-radius: 6px; font-weight: bold; font-size: 18px; min-width: 80px; text-align: center; align-self: flex-start; }
.latest-card .content h3 { font-size: 18px; margin-bottom: 8px; }
.latest-card .type { color: #666; font-size: 14px; margin-bottom: 10px; }
.latest-card p { font-size: 14px; color: #444; line-height: 1.6; }

.detail-page { padding: 40px 20px; }
.detail-header { background: white; padding: 30px; border-radius: 8px; margin-bottom: 20px; box-shadow: 0 2px 8px rgba(0,0,0,0.08); }
.detail-header h1 { font-size: 32px; color: #1e40af; }

.detail-info { background: white; padding: 25px; border-radius: 8px; margin-bottom: 20px; box-shadow: 0 2px 8px rgba(0,0,0,0.08); }
.info-row { display: flex; padding: 10px 0; border-bottom: 1px solid #f3f4f6; }
.info-row:last-child { border-bottom: none; }
.info-row .label { font-weight: bold; min-width: 80px; color: #2563eb; }

.detail-section { background: white; padding: 25px; border-radius: 8px; margin-bottom: 20px; box-shadow: 0 2px 8px rgba(0,0,0,0.08); }
.detail-section h2 { font-size: 22px; margin-bottom: 15px; color: #1e40af; }
.detail-section .highlight { font-size: 18px; line-height: 1.8; color: #2563eb; font-weight: 500; }
.detail-section .summary { font-size: 16px; line-height: 1.8; color: #333; }
.detail-section .review { font-size: 15px; line-height: 1.8; color: #555; font-style: italic; background: #f9fafb; padding: 15px; border-radius: 6px; border-left: 4px solid #2563eb; }

.related-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 15px; }
.related-item { background: #f9fafb; padding: 15px; border-radius: 6px; transition: all 0.3s; }
.related-item:hover { background: #e5e7eb; transform: translateY(-2px); }
.related-item h4 { font-size: 16px; margin-bottom: 8px; }
.related-item p { font-size: 14px; color: #666; }

@media (max-width: 768px) {
  .hero h1 { font-size: 24px; }
  .hero .intro { font-size: 14px; }
  .section h2 { font-size: 22px; }
  .video-grid { grid-template-columns: 1fr; }
  .rank-card { flex-direction: column; gap: 10px; }
  .rank-num { font-size: 24px; min-width: auto; }
  .topic-list { grid-template-columns: 1fr; }
  .latest-card { flex-direction: column; gap: 15px; }
  .detail-header h1 { font-size: 24px; }
  .related-grid { grid-template-columns: 1fr; }
}