* { margin: 0; padding: 0; box-sizing: border-box; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  line-height: 1.6; color: #2c3e50; background: #fafbfc;
  padding: 0 16px; max-width: 1200px; margin: 0 auto;
}
.breadcrumb { flex-wrap: wrap; font-size: 14px; padding: 16px 0; color: #666; }
.breadcrumb a { color: #3498db; text-decoration: none; padding: 4px 0; display: inline-block; }
h1 { margin: 16px 0 8px; font-size: 2em; }
h2 { margin: 24px 0 16px; font-size: 1.5em; border-bottom: 2px solid #eef2f6; padding-bottom: 8px; }
h3 { margin: 16px 0 8px; }
.subtitle { font-size: 1.1em; color: #5a6c7c; margin-bottom: 24px; }
.home-announcement { background: #f4f7fb; padding: 24px; border-radius: 12px; margin: 24px 0; }
.card-grid { display: grid; grid-template-columns: 1fr; gap: 20px; margin: 20px 0; }
.card { background: white; border-radius: 12px; padding: 20px; box-shadow: 0 2px 8px rgba(0,0,0,0.04); border: 1px solid #eef2f6; }
.card h3 { margin-top: 0; }
.card h3 a { color: #2c3e50; text-decoration: none; }
.card p { color: #5a6c7c; font-size: 0.95em; }
.card a { color: #3498db; text-decoration: none; margin-right: 8px; line-height: 1.8; }
.tag { display: inline-block; background: #eef2f6; padding: 4px 12px; border-radius: 30px; font-size: 13px; color: #4a5c6c; margin-right: 8px; margin-bottom: 8px; }
.future-link { color: #999; border-bottom: 1px dashed #ccc; }
.internal-nav { margin-top: 32px; padding: 20px; background: #f4f7fb; border-radius: 12px; }
.ai-prompts { margin: 24px 0; padding: 20px; background: #f9f9f9; border-radius: 12px; }
pre { background: #2d2d2d; color: #f8f8f2; padding: 16px; border-radius: 8px; overflow-x: auto; white-space: pre-wrap; word-break: break-word; }
code { font-family: 'Courier New', monospace; }
footer { margin: 40px 0 20px; text-align: center; color: #888; font-size: 14px; border-top: 1px solid #eef2f6; padding-top: 20px; }
ul, ol { padding-left: 24px; margin: 12px 0; }
li { margin: 6px 0; }

@media (min-width: 640px) {
  .card-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 1024px) {
  .card-grid { grid-template-columns: repeat(3, 1fr); }
}