:root{
  --brand:#C0392B; --bg:#fff; --surface:#FDF9F6; --border:#E5DDD5;
  --text:#1A1A2E; --muted:#7B7B8A;
}
@media (prefers-color-scheme:dark){
  :root{ --bg:#15100F; --surface:#1E1817; --border:#332927; --text:#F3EDEA; --muted:#A2938E; }
}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--text);
  font:16px/1.7 -apple-system,BlinkMacSystemFont,"Hiragino Sans","Noto Sans JP","Noto Sans KR","Noto Sans SC",sans-serif}
a{color:inherit}
main{max-width:44rem;margin:0 auto;padding:0 1.25rem 3rem}
.top{max-width:44rem;margin:0 auto;padding:1.25rem;display:flex;gap:1rem;
  align-items:center;justify-content:space-between;flex-wrap:wrap}
.brand{font-weight:800;text-decoration:none;color:var(--brand)}
.langs{display:flex;gap:.5rem;flex-wrap:wrap}
.lang{font-size:.8rem;padding:.2rem .55rem;border:1px solid var(--border);
  border-radius:999px;text-decoration:none;color:var(--muted)}
.lang.on{border-color:var(--brand);color:var(--brand)}
h1{font-size:1.9rem;line-height:1.3;margin:.4em 0 .3em}
h2{font-size:1.05rem;margin:1.8em 0 .5em;letter-spacing:.04em;text-transform:uppercase}
.lede{color:var(--muted);font-size:1.05rem}
.crumbs{font-size:.82rem;color:var(--muted);margin-top:.5rem}
.crumbs a{text-decoration:none}
.crumbs a:hover{text-decoration:underline}
.pill{display:inline-block;font-size:.72rem;font-weight:700;padding:.2rem .6rem;
  border:1px solid;border-radius:999px;letter-spacing:.05em}
ul.grid,ul.list{list-style:none;padding:0;display:grid;gap:.6rem}
ul.grid{grid-template-columns:repeat(auto-fill,minmax(13rem,1fr))}
ul.grid a,ul.list a{display:flex;gap:.7rem;align-items:baseline;text-decoration:none;
  padding:.9rem 1rem;border:1px solid var(--border);border-radius:.7rem;background:var(--surface)}
ul.grid a:hover,ul.list a:hover{border-color:var(--brand)}
ul.list a{flex-direction:column;gap:.25rem}
.ico{font-size:1.2rem}
.ttl{font-weight:700}
.sub,.num{color:var(--muted);font-size:.85rem}
.num{margin-left:auto}
article section ul{padding-left:1.2rem}
.dos li::marker{color:#2E7D32}
.donts li::marker{color:#C62828}
.tips p{background:var(--surface);border-left:3px solid var(--brand);
  padding:.8rem 1rem;border-radius:0 .5rem .5rem 0;margin:0}
.related{margin-top:2.5rem;border-top:1px solid var(--border);padding-top:1.5rem}
.related h2{font-size:.82rem;color:var(--muted);letter-spacing:.08em;margin:0 0 .9rem}
.related .more{margin:.9rem 0 0;font-size:.9rem}
.related .more a{color:var(--brand);text-decoration:none;font-weight:700}
.related .more a:hover{text-decoration:underline}
.cta{max-width:44rem;margin:0 auto 2rem;padding:1.6rem 1.25rem;background:var(--surface);
  border:1px solid var(--border);border-radius:.9rem;text-align:center}
.cta h2{margin-top:0;text-transform:none;font-size:1.2rem;letter-spacing:0}
.cta p{color:var(--muted);margin:.4rem 0 1.1rem}
.btn{display:inline-block;background:var(--brand);color:#fff;text-decoration:none;
  font-weight:700;padding:.7rem 1.6rem;border-radius:999px}
.foot{max-width:44rem;margin:0 auto;padding:1.5rem 1.25rem 3rem;color:var(--muted);
  font-size:.85rem;border-top:1px solid var(--border)}