:root { color-scheme: light dark; }
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.65;
  color: #1a1a1a;
  background: #ffffff;
}
.wrap { max-width: 720px; margin: 0 auto; padding: 40px 22px 80px; }
header.site { border-bottom: 1px solid #e5e5e5; padding-bottom: 18px; margin-bottom: 28px; }
h1 { font-size: 1.75rem; margin: 0 0 4px; letter-spacing: -0.02em; }
.sub { color: #666; font-size: 0.95rem; margin: 0; }
.updated { color: #666; font-size: 0.88rem; margin: 0 0 8px; }
h2 { font-size: 1.12rem; margin-top: 30px; margin-bottom: 6px; }
h3 { font-size: 1.02rem; margin: 0 0 6px; }
.app { border: 1px solid #e5e5e5; border-radius: 12px; padding: 18px 20px; margin: 12px 0; }
p { margin: 0 0 14px; }
a { color: #1a73e8; text-decoration: none; }
a:hover { text-decoration: underline; }
.back { display: inline-block; margin-bottom: 22px; font-size: 0.9rem; }
.card {
  display: block; border: 1px solid #e5e5e5; border-radius: 12px;
  padding: 18px 20px; margin: 12px 0; text-decoration: none; color: inherit;
  font-weight: 600;
}
.card:hover { border-color: #1a73e8; text-decoration: none; }
footer { margin-top: 56px; padding-top: 20px; border-top: 1px solid #e5e5e5; color: #666; font-size: 0.85rem; }
@media (prefers-color-scheme: dark) {
  body { color: #e6e6e6; background: #0f1115; }
  header.site, footer, .card, .app { border-color: #2a2d34; }
  .sub, .updated, footer { color: #9aa0a6; }
  a { color: #8ab4f8; }
  .card:hover { border-color: #8ab4f8; }
}