* { box-sizing: border-box; }
body { margin: 0; padding: 0; }
main { max-width: 1200px; margin: 20px auto; padding: 0 20px; }
.hero { text-align: center; padding: 40px 20px; background: #fff; border-radius: 8px; margin-bottom: 30px; box-shadow: 0 2px 8px rgba(0,0,0,0.05); }
.hero h1 { font-size: 28px; margin: 0 0 15px; color: #1a73e8; }
.intro { font-size: 16px; line-height: 1.8; color: #555; max-width: 900px; margin: 0 auto; }
.section { margin-bottom: 40px; }
.section h2 { font-size: 24px; margin: 0 0 20px; padding-bottom: 10px; border-bottom: 2px solid #1a73e8; }
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 20px; }
.card { background: #fff; padding: 20px; border-radius: 8px; box-shadow: 0 2px 6px rgba(0,0,0,0.08); transition: transform 0.3s, box-shadow 0.3s; }
.card:hover { transform: translateY(-3px); box-shadow: 0 4px 12px rgba(0,0,0,0.15); }
.card h3 { margin: 0 0 10px; font-size: 18px; }
.card h3 a { color: #333; }
.card h3 a:hover { color: #1a73e8; }
.meta { font-size: 14px; color: #888; margin: 5px 0; }
.more { text-align: center; margin-top: 20px; }
.more a { display: inline-block; padding: 10px 20px; background: #1a73e8; color: #fff; border-radius: 5px; }
.more a:hover { background: #1557b0; text-decoration: none; }
.page-header { background: #fff; padding: 30px; border-radius: 8px; margin-bottom: 30px; }
.page-header h1 { font-size: 26px; margin: 0 0 10px; color: #1a73e8; }
.list-section { background: #fff; padding: 20px; border-radius: 8px; }
.list-item { padding: 20px; border-bottom: 1px solid #eee; }
.list-item:last-child { border-bottom: none; }
.list-item h3 { margin: 0 0 10px; font-size: 20px; }
.list-item h3 a { color: #333; }
.list-item h3 a:hover { color: #1a73e8; }
.item-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 10px; }
.badge { background: #1a73e8; color: #fff; padding: 3px 10px; border-radius: 3px; font-size: 12px; }
.tags { font-size: 14px; color: #666; }
.ranked { display: flex; gap: 15px; align-items: flex-start; }
.rank-badge { flex-shrink: 0; width: 40px; height: 40px; background: linear-gradient(135deg, #667eea 0%, #764ba2 100%); color: #fff; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 18px; font-weight: bold; }
.item-content { flex: 1; }
.topic-group { margin-bottom: 40px; }
.group-title { font-size: 22px; margin: 0 0 20px; color: #1a73e8; padding-left: 15px; border-left: 4px solid #1a73e8; }
.topic-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 15px; }
.topic-card { background: #f9f9f9; padding: 15px; border-radius: 6px; border-left: 3px solid #1a73e8; }
.topic-card h4 { margin: 0 0 8px; font-size: 16px; }
.topic-card h4 a { color: #333; }
.brief { font-size: 14px; color: #666; margin: 5px 0 0; }
.with-date .item-header { display: flex; justify-content: space-between; }
.date { font-size: 14px; color: #888; }
.detail-page { max-width: 900px; }
.detail-header { background: #fff; padding: 30px; border-radius: 8px; margin-bottom: 20px; }
.detail-header h1 { font-size: 28px; margin: 0; color: #1a73e8; }
.detail-info, .detail-highlight, .detail-summary, .detail-review, .detail-related { background: #fff; padding: 25px; border-radius: 8px; margin-bottom: 20px; }
.detail-info h2, .detail-highlight h2, .detail-summary h2, .detail-review h2, .detail-related h2 { font-size: 20px; margin: 0 0 15px; color: #333; border-bottom: 2px solid #1a73e8; padding-bottom: 8px; }
.detail-info dl { display: grid; grid-template-columns: 80px 1fr; gap: 10px; }
.detail-info dt { font-weight: bold; color: #555; }
.detail-info dd { margin: 0; color: #333; }
.highlight-text { font-size: 18px; line-height: 1.8; color: #555; font-style: italic; }
.detail-summary p, .detail-review p { line-height: 1.8; color: #555; }
.related-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 15px; }
.related-card { background: #f9f9f9; padding: 15px; border-radius: 6px; border-left: 3px solid #1a73e8; }
.related-card h4 { margin: 0 0 8px; font-size: 16px; }
.related-card h4 a { color: #333; }
.related-card p { font-size: 14px; color: #666; margin: 0; }
footer { text-align: center; padding: 20px; color: #888; font-size: 14px; margin-top: 40px; }
@media (max-width: 768px) {
  .hero h1 { font-size: 22px; }
  .intro { font-size: 14px; }
  .grid { grid-template-columns: 1fr; }
  .topic-grid { grid-template-columns: 1fr; }
  .related-grid { grid-template-columns: 1fr; }
  .detail-info dl { grid-template-columns: 70px 1fr; gap: 8px; }
}