:root {
  color-scheme: light dark;
  --accent: #0a6cff;
  --text: #1d1d1f;
  --secondary: #6e6e73;
  --bg: #ffffff;
  --card: #f5f5f7;
}
@media (prefers-color-scheme: dark) {
  :root {
    --text: #f5f5f7;
    --secondary: #a1a1a6;
    --bg: #000000;
    --card: #1c1c1e;
  }
}
* { margin: 0; padding: 0; box-sizing: border-box; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Noto Sans JP", sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.9;
  -webkit-font-smoothing: antialiased;
}
.container { max-width: 720px; margin: 0 auto; padding: 24px 20px 80px; }
header.site {
  padding: 20px 0 16px;
  display: flex; align-items: center; gap: 10px;
  border-bottom: 1px solid color-mix(in srgb, var(--secondary) 25%, transparent);
  margin-bottom: 32px;
}
header.site .logo {
  font-size: 22px; font-weight: 700; font-style: italic;
  letter-spacing: -0.8px;
  color: var(--text); text-decoration: none;
}
header.site .logo span { color: var(--accent); }
h1 { font-size: 28px; letter-spacing: -0.5px; margin-bottom: 8px; }
.updated { color: var(--secondary); font-size: 14px; margin-bottom: 32px; }
h2 { font-size: 20px; margin: 36px 0 12px; letter-spacing: -0.3px; }
h3 { font-size: 16px; margin: 24px 0 8px; }
p, li { font-size: 15px; }
ul, ol { padding-left: 1.4em; margin: 8px 0 16px; }
li { margin-bottom: 6px; }
strong { font-weight: 700; }
footer {
  margin-top: 64px; padding-top: 24px;
  border-top: 1px solid color-mix(in srgb, var(--secondary) 25%, transparent);
  color: var(--secondary); font-size: 13px;
}
a { color: var(--accent); }
.card {
  background: var(--card); border-radius: 16px; padding: 20px 24px;
  margin: 16px 0;
}
.nav-links { display: flex; flex-direction: column; gap: 12px; margin-top: 24px; }
.nav-links a {
  display: block; background: var(--card); border-radius: 14px;
  padding: 18px 22px; text-decoration: none; font-weight: 600;
  color: var(--text); font-size: 16px;
}
.nav-links a small { display: block; color: var(--secondary); font-weight: 400; font-size: 13px; margin-top: 2px; }