:root {
  --brand: #4f5bd5;
  --header: #4f5bd5;
  --brand-soft: #eceefc;
  --ink: #24201f;
  --muted: #5f6370;
  --bg: #ffffff;
  --surface: #f6f6fb;
  --line: #e1e3f0;
}
@media (prefers-color-scheme: dark) {
  :root {
    --brand: #9aa3ff;
    --header: #343aa0;
    --brand-soft: #22254a;
    --ink: #f4eff0;
    --muted: #a7aabb;
    --bg: #121320;
    --surface: #1b1c2c;
    --line: #2a2c42;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  overflow-wrap: anywhere;
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans JP", sans-serif;
  line-height: 1.85;
  color: var(--ink);
  background: var(--bg);
}
header { background: var(--header); color: #fff; }
header .inner, main, footer .inner { max-width: 760px; margin: 0 auto; padding: 0 20px; }
header .inner { padding-top: 28px; padding-bottom: 28px; display: flex; gap: 16px; align-items: center; }
header img { width: 64px; height: 64px; border-radius: 15px; flex: none; }
header h1 { margin: 0; font-size: 1.35rem; line-height: 1.4; overflow-wrap: anywhere; }
header p { margin: 4px 0 0; opacity: 0.9; font-size: 0.9rem; }
nav { border-bottom: 1px solid var(--line); background: var(--surface); }
nav .inner { max-width: 760px; margin: 0 auto; padding: 10px 20px; display: flex; gap: 20px; flex-wrap: wrap; font-size: 0.92rem; }
a { color: var(--brand); }
nav a { text-decoration: none; font-weight: 600; }
nav a[aria-current="page"] { text-decoration: underline; text-underline-offset: 6px; }
main { padding-top: 12px; padding-bottom: 48px; }
h2 { font-size: 1.15rem; margin: 2.2em 0 0.6em; padding-bottom: 6px; border-bottom: 2px solid var(--brand-soft); }
h3 { font-size: 1rem; margin: 1.6em 0 0.3em; }
.updated { color: var(--muted); font-size: 0.88rem; }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: 14px; padding: 16px 20px; margin: 16px 0; }
.contact { font-size: 1.05rem; font-weight: 700; word-break: break-all; }
.note { color: var(--muted); font-size: 0.88rem; }
ul { padding-left: 1.3em; }
li { margin: 0.3em 0; }
footer { border-top: 1px solid var(--line); color: var(--muted); font-size: 0.85rem; }
footer .inner { padding-top: 20px; padding-bottom: 32px; }
.nowrap { white-space: nowrap; }