.container { max-width: 1200px; margin: 0 auto; padding: 20px; }
.hero { text-align: center; padding: 40px 20px; background: #fff; margin: 20px 0; border-radius: 8px; }
.hero h1 { font-size: 28px; margin-bottom: 20px; color: #1a73e8; }
.intro { font-size: 16px; line-height: 1.8; max-width: 800px; margin: 0 auto; }
section { margin: 30px 0; padding: 20px; background: #fff; border-radius: 8px; }
h2 { font-size: 24px; margin-bottom: 20px; color: #333; border-left: 4px solid #1a73e8; padding-left: 12px; }
h3 { font-size: 18px; margin-bottom: 10px; }
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 20px; }
.card { padding: 20px; border: 1px solid #e0e0e0; border-radius: 6px; transition: box-shadow 0.3s; }
.card:hover { box-shadow: 0 4px 12px rgba(0,0,0,0.1); }
.card h3 { margin-bottom: 8px; }
.meta { font-size: 14px; color: #666; margin: 8px 0; }
.desc { font-size: 14px; color: #555; line-height: 1.6; }
.tags { font-size: 12px; color: #888; }
.list { list-style: none; }
.list li { padding: 12px 0; border-bottom: 1px solid #f0f0f0; display: flex; justify-content: space-between; align-items: center; }
.link-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 20px; }
.link-card { display: block; padding: 30px; border: 2px solid #e0e0e0; border-radius: 8px; text-align: center; transition: all 0.3s; }
.link-card:hover { border-color: #1a73e8; text-decoration: none; box-shadow: 0 4px 12px rgba(26,115,232,0.2); }
.ranked-list { list-style: none; counter-reset: rank; }
.ranked-item { display: flex; gap: 20px; padding: 20px 0; border-bottom: 1px solid #f0f0f0; }
.rank { font-size: 32px; font-weight: bold; color: #1a73e8; min-width: 50px; }
.item-content { flex: 1; }
.topic-group { margin: 30px 0; }
.group-title { font-size: 20px; margin-bottom: 15px; color: #1a73e8; }
.timeline-list { list-style: none; }
.timeline-item { display: flex; gap: 20px; padding: 20px 0; border-left: 2px solid #1a73e8; padding-left: 20px; margin-left: 60px; position: relative; }
.timeline-item .date { position: absolute; left: -80px; font-weight: bold; color: #1a73e8; }
.detail article { max-width: 800px; margin: 0 auto; }
.info-list { display: grid; grid-template-columns: auto 1fr; gap: 10px 20px; }
.info-list dt { font-weight: bold; color: #666; }
.highlight { font-size: 18px; color: #1a73e8; font-weight: 500; line-height: 1.8; }
.summary { font-size: 16px; line-height: 1.8; text-align: justify; }
.review { font-size: 15px; line-height: 1.8; color: #555; background: #f9f9f9; padding: 15px; border-radius: 6px; border-left: 3px solid #1a73e8; }
.page-intro { font-size: 15px; color: #666; margin-bottom: 20px; line-height: 1.8; }
@media (max-width: 768px) {
  .container { padding: 10px; }
  .hero { padding: 20px 10px; }
  .hero h1 { font-size: 20px; }
  h2 { font-size: 20px; }
  .grid { grid-template-columns: 1fr; gap: 15px; }
  section { padding: 15px; margin: 15px 0; }
  .timeline-item { margin-left: 40px; }
  .timeline-item .date { left: -50px; font-size: 14px; }
}