:root{--bg:#FBF3E4;--ink:#22201C;--muted:#6E685C;--accent:#B4441F;--band:#C9502E;--card:#fff;--line:#E2D9C6}
@media(prefers-color-scheme:dark){:root:not([data-theme="light"]){--bg:#1B1915;--ink:#F2EADA;--muted:#A79E8C;--accent:#E8845C;--band:#C9502E;--card:#252118;--line:#3A3428}}
:root[data-theme="dark"]{--bg:#1B1915;--ink:#F2EADA;--muted:#A79E8C;--accent:#E8845C;--band:#C9502E;--card:#252118;--line:#3A3428}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"Hiragino Sans","Noto Sans JP",sans-serif;line-height:1.9;-webkit-text-size-adjust:100%}
header{background:var(--band);padding:20px 16px}
header a{color:#fff;text-decoration:none;font-weight:700;font-size:19px}
nav{max-width:820px;margin:0 auto;display:flex;gap:20px;flex-wrap:wrap;align-items:center}
nav .sp{flex:1}
nav .lnk{font-size:15px;font-weight:400;opacity:.92}
main{max-width:820px;margin:0 auto;padding:40px 16px 88px}
h1{font-size:28px;line-height:1.5;margin:0 0 20px}
h2{font-size:20px;margin:44px 0 12px;padding-bottom:8px;border-bottom:2px solid var(--accent)}
h3{font-size:17px;margin:28px 0 8px}
p{margin:0 0 18px}
a{color:var(--accent)}
ul,ol{margin:0 0 18px;padding-left:22px}
li{margin-bottom:8px}
.lead{color:var(--muted);font-size:17px}
.card{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:20px 22px;margin:0 0 22px}
.card h2{margin-top:0}
dl{margin:0}
dt{font-weight:700;margin-top:16px}
dd{margin:4px 0 0}
footer{border-top:1px solid var(--line);margin-top:56px;padding:24px 16px 48px;color:var(--muted);font-size:14px}
footer div{max-width:820px;margin:0 auto}
.date{color:var(--muted);font-size:14px}