:root {
  --bg: #fffdf5;
  --text: #1d2a3a;
  --muted: #5b6573;
  --card: #ffffff;
  --line: #e7e2d3;
  --accent: #3f8f3a;
  --yellow: #ffd84d;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14191f;
    --text: #e8ecf1;
    --muted: #a3adb9;
    --card: #1c232b;
    --line: #2c3540;
    --accent: #8fd16a;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Noto Sans JP", "Yu Gothic UI", sans-serif;
  line-height: 1.8;
}
main { max-width: 720px; margin: 0 auto; padding: 24px 16px 64px; }
header { display: flex; align-items: center; gap: 14px; margin: 8px 0 24px; }
header img { width: 64px; height: 64px; border-radius: 15px; }
header .name { font-size: 20px; font-weight: 700; margin: 0; line-height: 1.4; }
header .sub { color: var(--muted); font-size: 14px; margin: 0; }
h1 { font-size: 24px; margin: 8px 0 16px; }
h2 { font-size: 18px; margin: 32px 0 8px; padding-top: 8px; border-top: 1px solid var(--line); }
p, li { font-size: 16px; }
a { color: var(--accent); }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 16px; margin: 16px 0; }
.muted { color: var(--muted); font-size: 14px; }
nav { display: flex; flex-wrap: wrap; gap: 8px 16px; margin: 32px 0 0; padding-top: 16px; border-top: 1px solid var(--line); font-size: 14px; }
dt { font-weight: 700; margin-top: 12px; }
dd { margin: 4px 0 0; }