:root {
  --bg: #f7f6f2;
  --surface: #ffffff;
  --text: #1d2230;
  --muted: #5b6272;
  --line: #e4e1d8;
  --accent: #b88a2e;
  --navy: #14213d;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #11151f;
    --surface: #181e2b;
    --text: #eceae4;
    --muted: #a3a9b6;
    --line: #2a3142;
    --accent: #e0b65a;
    --navy: #e9e6dc;
  }
}
:root[data-theme="dark"] {
  --bg: #11151f;
  --surface: #181e2b;
  --text: #eceae4;
  --muted: #a3a9b6;
  --line: #2a3142;
  --accent: #e0b65a;
  --navy: #e9e6dc;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans JP", "Yu Gothic", system-ui, sans-serif;
  line-height: 1.8;
  font-size: 16px;
}
.wrap { max-width: 760px; margin: 0 auto; padding: 0 16px; }
header { border-bottom: 1px solid var(--line); background: var(--surface); }
header .wrap { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding-top: 14px; padding-bottom: 14px; flex-wrap: wrap; }
.brand { font-weight: 700; color: var(--navy); text-decoration: none; font-size: 18px; }
nav a { color: var(--muted); text-decoration: none; margin-left: 16px; font-size: 14px; }
nav a:first-child { margin-left: 0; }
nav a:hover, nav a[aria-current="page"] { color: var(--accent); }
main { padding: 32px 0 48px; }
h1 { font-size: 26px; line-height: 1.4; margin: 0 0 8px; color: var(--navy); }
h2 { font-size: 19px; margin: 36px 0 8px; color: var(--navy); }
h3 { font-size: 16px; margin: 20px 0 4px; }
p, li { color: var(--text); }
.lead { color: var(--muted); margin-top: 0; }
.cards { display: grid; gap: 16px; grid-template-columns: 1fr; margin-top: 20px; }
@media (min-width: 640px) { .cards { grid-template-columns: 1fr 1fr; } }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: 14px; padding: 20px; }
.card img { width: 64px; height: 64px; border-radius: 50%; display: block; }
.card h3 { margin-top: 12px; }
.card p { margin: 4px 0 10px; color: var(--muted); font-size: 15px; }
.links a { display: inline-block; margin: 0 10px 6px 0; color: var(--accent); text-decoration: none; font-size: 14px; }
.links a:hover { text-decoration: underline; }
.note { background: var(--surface); border-left: 4px solid var(--accent); padding: 12px 16px; border-radius: 6px; color: var(--muted); }
a { color: var(--accent); overflow-wrap: anywhere; }
footer { border-top: 1px solid var(--line); padding: 20px 0 32px; color: var(--muted); font-size: 13px; }
footer a { color: var(--muted); margin-right: 14px; }
.en { color: var(--muted); font-size: 14px; }