:root{--bg:#fafaf8;--fg:#1d1d1b;--muted:#6b6b66;--line:#e2e1dc;--accent:#1f3a5f}
@media (prefers-color-scheme:dark){:root{--bg:#141413;--fg:#ecebe6;--muted:#a3a29b;--line:#2e2d2a;--accent:#9db8dd}}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--fg);font-family:-apple-system,BlinkMacSystemFont,"Hiragino Sans","Noto Sans JP",sans-serif;line-height:1.8}
.wrap{max-width:760px;margin:0 auto;padding:0 20px}
header{border-bottom:1px solid var(--line)}
header .wrap{display:flex;justify-content:space-between;align-items:center;height:64px}
.logo{font-weight:700;letter-spacing:.08em;color:var(--fg);text-decoration:none}
nav a{color:var(--muted);text-decoration:none;margin-left:20px;font-size:14px}
nav a:hover{color:var(--accent)}
main{padding:56px 0 80px}
h1{font-size:28px;margin:0 0 8px;letter-spacing:.02em}
.lead{color:var(--muted);margin:0 0 40px}
h2{font-size:18px;margin:48px 0 12px;padding-bottom:8px;border-bottom:1px solid var(--line)}
dl{display:grid;grid-template-columns:8em 1fr;gap:10px 16px;margin:0}
dt{color:var(--muted)}dd{margin:0}
ul{padding-left:1.2em}
.notice{border:1px solid var(--line);border-radius:8px;padding:20px 24px}
footer{border-top:1px solid var(--line);color:var(--muted);font-size:13px}
footer .wrap{padding:20px}
@media (max-width:520px){dl{grid-template-columns:1fr}dt{margin-top:8px}}