/* アプリと同じ白黒（白地・#111の墨・グレー、角丸4、線で区切る） */
:root {
  --bg: #ffffff;
  --text: #111111;
  --muted: #6b6b6b;
  --line: #e2e2e2;
  --ink: #111111;
  --on-ink: #ffffff;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111111;
    --text: #f2f2f2;
    --muted: #9a9a9a;
    --line: #2e2e2e;
    --ink: #f2f2f2;
    --on-ink: #111111;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Helvetica Neue", Helvetica, Arial, -apple-system, "Hiragino Sans", "Noto Sans JP", sans-serif;
  line-height: 1.8;
  -webkit-text-size-adjust: 100%;
}
main { max-width: 720px; margin: 0 auto; padding: 24px 16px 64px; }
nav {
  display: flex; flex-wrap: wrap; gap: 4px 20px;
  font-size: 13px; letter-spacing: 0.02em;
  padding-bottom: 12px; margin-bottom: 32px;
  border-bottom: 1px solid var(--line);
}
nav a { color: var(--muted); text-decoration: none; }
nav a:hover, nav a[aria-current="page"] { color: var(--text); }
h1 { font-size: 26px; font-weight: 700; line-height: 1.4; letter-spacing: 0.01em; margin: 0 0 8px; }
h2 { font-size: 17px; font-weight: 700; margin: 40px 0 8px; padding-top: 20px; border-top: 1px solid var(--line); }
h3 { font-size: 15px; font-weight: 700; margin: 24px 0 4px; }
p, li { font-size: 15px; }
.meta { color: var(--muted); font-size: 13px; }
table { width: 100%; border-collapse: collapse; font-size: 14px; margin: 8px 0; }
th, td { border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); padding: 10px 8px 10px 0; text-align: left; vertical-align: top; }
th { width: 30%; font-weight: 700; }
a { color: var(--text); text-decoration: underline; text-underline-offset: 3px; text-decoration-thickness: 1px; }
.button {
  display: inline-block; padding: 10px 16px; border-radius: 4px;
  background: var(--ink); color: var(--on-ink); text-decoration: none; font-weight: 700;
}
footer { margin-top: 56px; padding-top: 12px; border-top: 1px solid var(--line); color: var(--muted); font-size: 12px; }