:root{color-scheme:light dark;--bg:#f2f2f7;--text:#22232a;--muted:#626470;--accent:#bd1550;--line:#d5d6df;--surface:#fff}*{box-sizing:border-box}html{scroll-padding-top:2rem}body{margin:0;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,"Hiragino Sans","Noto Sans JP",sans-serif;font-size:16px;line-height:1.95;overflow-wrap:anywhere}a{color:var(--accent);text-underline-offset:.22em}a:focus-visible{outline:3px solid var(--accent);outline-offset:5px;border-radius:2px}.skip{position:absolute;top:-6rem;left:1rem;padding:.5rem;background:var(--surface)}.skip:focus{top:.5rem}header{max-width:1040px;margin:0 auto;padding:28px 32px;display:flex;gap:20px;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line)}.brand{font-size:23px;font-weight:750;color:var(--text);text-decoration:none;white-space:nowrap}header nav{display:flex;gap:22px;flex-wrap:wrap}header nav a{font-size:14px;color:var(--muted);text-decoration:none;padding:4px 0}header nav a[aria-current]{color:var(--accent);text-decoration:underline}main{max-width:760px;margin:0 auto;padding:48px 32px 72px}h1{font-size:clamp(28px,5vw,38px);line-height:1.5;letter-spacing:-.02em;margin:0 0 24px;font-weight:750}h2{font-size:21px;line-height:1.6;margin:42px 0 14px;font-weight:700}p{margin:0 0 20px}.lead{font-size:24px;margin-bottom:28px}.contents{padding:22px 0 20px;border-top:1px solid var(--line);border-bottom:1px solid var(--line);margin:28px 0 32px;font-size:14px}.contents span{font-weight:700}.contents ol{list-style:none;display:grid;grid-template-columns:1fr 1fr;gap:6px 24px;padding:10px 0 0;margin:0}.contents a{color:var(--muted)}footer{max-width:1040px;margin:0 auto;padding:24px 32px;border-top:1px solid var(--line);display:flex;justify-content:space-between;font-size:13px;color:var(--muted)}footer p{margin:0}@media(max-width:620px){header{padding:22px;display:block}header nav{gap:12px 18px;margin-top:14px}main{padding:32px 22px 52px}.contents ol{grid-template-columns:1fr}h2{font-size:19px}footer{padding:22px;gap:20px}}@media(prefers-color-scheme:dark){:root{--bg:#18181d;--surface:#24242c;--text:#f2f2f7;--muted:#b9bbc6;--accent:#ff88b1;--line:#41414c}}@media(prefers-reduced-motion:no-preference){html{scroll-behavior:smooth}}