:root {
  --ink: #2b2622;
  --sub: #7c736c;
  --line: #e7e1db;
  --bg: #fdfbf8;
  --card: #ffffff;
  --accent: #d98b9e;
}
* { 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", "Noto Sans JP", "Yu Gothic", sans-serif;
  line-height: 1.9;
  font-size: 16px;
}
.wrap { max-width: 760px; margin: 0 auto; padding: 0 20px 80px; }
header.site {
  border-bottom: 1px solid var(--line);
  background: var(--card);
  position: sticky; top: 0; z-index: 10;
}
header.site .wrap {
  padding: 16px 20px;
  display: flex; align-items: center; gap: 14px; flex-wrap: wrap;
}
.brand {
  font-weight: 700; font-size: 18px; color: var(--ink);
  text-decoration: none; letter-spacing: .02em;
}
header.site nav { margin-left: auto; display: flex; gap: 18px; }
header.site nav a { color: var(--sub); text-decoration: none; font-size: 14px; }
header.site nav a:hover { color: var(--ink); }
h1 { font-size: 26px; margin: 44px 0 6px; line-height: 1.5; }
.updated { color: var(--sub); font-size: 13px; margin: 0 0 32px; }
h2 { font-size: 18px; margin: 40px 0 10px; padding-bottom: 8px; border-bottom: 1px solid var(--line); }
h3 { font-size: 15px; margin: 26px 0 6px; }
p, li { font-size: 15px; }
ul, ol { padding-left: 1.4em; }
li { margin: 4px 0; }
a { color: #b06a7d; }
table { width: 100%; border-collapse: collapse; margin: 14px 0; font-size: 14px; display: block; overflow-x: auto; }
th, td { border: 1px solid var(--line); padding: 9px 11px; text-align: left; vertical-align: top; }
th { background: #f6f1ec; font-weight: 600; white-space: nowrap; }
.note {
  background: #fff6f8; border: 1px solid #f0d5dc;
  border-radius: 10px; padding: 14px 16px; margin: 18px 0; font-size: 14px;
}
.todo {
  background: #fffbe6; border: 1px solid #f0e0a0;
  border-radius: 10px; padding: 14px 16px; margin: 18px 0; font-size: 14px;
}
footer.site {
  border-top: 1px solid var(--line); background: var(--card);
  padding: 28px 0; color: var(--sub); font-size: 13px;
}
footer.site .wrap { padding-bottom: 0; display: flex; gap: 18px; flex-wrap: wrap; }
footer.site a { color: var(--sub); text-decoration: none; }
.hero { padding: 64px 0 20px; }
.hero h1 { font-size: 32px; margin: 0 0 10px; }
.hero p.lead { font-size: 17px; color: var(--sub); margin: 0 0 28px; }
.features { display: grid; grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); gap: 14px; margin: 28px 0; }
.feature { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 16px 18px; }
.feature h3 { margin: 0 0 4px; font-size: 15px; }
.feature p { margin: 0; font-size: 14px; color: var(--sub); }
@media (prefers-color-scheme: dark) {
  :root { --ink:#ece7e2; --sub:#a49b94; --line:#3a3430; --bg:#1b1815; --card:#242019; }
  th { background: #2c2721; }
  .note { background:#2a1f22; border-color:#4a343b; }
  .todo { background:#2b2718; border-color:#4e472a; }
  a { color: #e0a3b3; }
}