:root {
  color-scheme: light dark;
  --bg: #ffffff;
  --surface: #f6f7f8;
  --text: #1f2328;
  --sub: #55606b;
  --border: #e3e6ea;
  --accent: #c2410c;
  --accent-soft: #fff4e6;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1113;
    --surface: #191c1f;
    --text: #e8eaed;
    --sub: #a4adb6;
    --border: #2a2f35;
    --accent: #ff922b;
    --accent-soft: #2a1d12;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Yu Gothic UI", "Noto Sans JP", Meiryo, system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.85;
  letter-spacing: 0.01em;
}
a { color: var(--accent); text-underline-offset: 3px; }
a:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; border-radius: 2px; }
.skip { position: absolute; left: -999px; top: 0; background: var(--bg); padding: 8px 12px; }
.skip:focus { left: 8px; top: 8px; z-index: 10; }
.wrap { max-width: 720px; margin: 0 auto; padding: 0 20px; }
header.site { border-bottom: 1px solid var(--border); }
header.site .wrap { display: flex; align-items: center; gap: 12px; min-height: 64px; }
header.site a.brand { display: inline-flex; align-items: center; gap: 12px; color: var(--text); text-decoration: none; font-weight: 700; font-size: 18px; }
header.site img { width: 36px; height: 36px; border-radius: 8px; display: block; }
main { padding: 32px 0 64px; }
h1 { font-size: 28px; line-height: 1.4; margin: 0 0 8px; }
h2 { font-size: 20px; line-height: 1.5; margin: 40px 0 8px; padding-top: 24px; border-top: 1px solid var(--border); }
h3 { font-size: 17px; margin: 28px 0 4px; }
p, ul, ol { margin: 12px 0; }
li { margin: 4px 0; }
hr { border: 0; border-top: 1px solid var(--border); margin: 32px 0; }
blockquote { margin: 16px 0; padding: 12px 16px; background: var(--surface); border-left: 4px solid var(--border); border-radius: 4px; color: var(--sub); }
code { background: var(--surface); padding: 1px 6px; border-radius: 4px; font-size: 0.92em; }
.table-wrap { overflow-x: auto; margin: 16px 0; }
table { border-collapse: collapse; width: 100%; font-size: 15px; line-height: 1.6; }
th, td { border: 1px solid var(--border); padding: 8px 10px; text-align: left; vertical-align: top; }
th { background: var(--surface); white-space: nowrap; }
.lead { font-size: 18px; color: var(--text); }
.hero { padding: 24px 0 8px; }
.hero img { width: 64px; height: 64px; border-radius: 14px; display: block; margin-bottom: 20px; }
.hero h1 { font-size: 34px; }
.note { background: var(--accent-soft); border: 1px solid var(--border); border-radius: 12px; padding: 14px 16px; margin: 24px 0; }
.links { list-style: none; padding: 0; margin: 24px 0; display: grid; gap: 12px; }
.links a { display: block; padding: 16px 18px; border: 1px solid var(--border); border-radius: 12px; text-decoration: none; color: var(--text); min-height: 56px; }
.links a:hover { background: var(--surface); }
.links small { display: block; color: var(--sub); font-size: 14px; }
.updated { color: var(--sub); font-size: 14px; }
footer.site { border-top: 1px solid var(--border); color: var(--sub); font-size: 14px; padding: 24px 0 40px; }
footer.site nav { display: flex; flex-wrap: wrap; gap: 8px 20px; margin-bottom: 12px; }
footer.site a { color: var(--sub); }
details { border: 1px solid var(--border); border-radius: 12px; padding: 4px 16px; margin: 12px 0; }
summary { cursor: pointer; font-weight: 700; padding: 10px 0; min-height: 44px; }