:root {
  --bg: #f6f7f9;
  --card: #ffffff;
  --ink: #1c1c1e;
  --muted: #6b7280;
  --line: #e5e7eb;
  --brand: #2f6bff;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1115;
    --card: #171a21;
    --ink: #f2f3f5;
    --muted: #9aa2ad;
    --line: #262a33;
    --brand: #5b8cff;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans JP", "Yu Gothic", Meiryo, sans-serif;
  line-height: 1.8;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}
.wrap { max-width: 760px; margin: 0 auto; padding: 28px 20px 72px; }
header.site { display: flex; align-items: center; gap: 10px; padding: 4px 0 20px; }
header.site .logo {
  width: 34px; height: 34px; border-radius: 9px;
  background: var(--brand); color: #fff; font-weight: 800;
  display: grid; place-items: center; font-size: 18px;
}
header.site .name { font-weight: 800; font-size: 18px; letter-spacing: .2px; }
.card {
  background: var(--card); border: 1px solid var(--line);
  border-radius: 16px; padding: 28px 24px; margin-top: 8px;
}
h1 { font-size: 24px; line-height: 1.4; margin: 0 0 6px; }
.updated { color: var(--muted); font-size: 13px; margin: 0 0 22px; }
h2 { font-size: 18px; margin: 30px 0 8px; padding-top: 6px; }
h2:first-of-type { margin-top: 8px; }
p, li { font-size: 15px; }
ul { padding-left: 1.25em; }
li { margin: 4px 0; }
a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }
.note { color: var(--muted); font-size: 13px; }
.contact { margin-top: 8px; padding: 14px 16px; background: var(--bg); border: 1px solid var(--line); border-radius: 12px; }
.foot { margin-top: 28px; display: flex; gap: 18px; flex-wrap: wrap; font-size: 14px; }
.foot .sep { color: var(--muted); }
hr { border: none; border-top: 1px solid var(--line); margin: 26px 0; }
.index-links { display: grid; gap: 12px; margin-top: 18px; }
.index-links a {
  display: block; background: var(--card); border: 1px solid var(--line);
  border-radius: 14px; padding: 18px 20px; font-weight: 600; color: var(--ink);
}
.index-links a:hover { border-color: var(--brand); text-decoration: none; }
.index-links a span { display: block; color: var(--muted); font-weight: 400; font-size: 13px; margin-top: 2px; }