:root{color-scheme:light;--ink:#202d3a;--muted:#5d6875;--paper:#f5f4ef;--line:#d8dcd7;--accent:#17695a}*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font-family:system-ui,-apple-system,"Noto Sans JP",sans-serif;line-height:1.9}a{color:var(--accent);text-underline-offset:4px}header,main,footer{max-width:1000px;margin:auto;padding:28px 30px}header{display:flex;align-items:center;justify-content:space-between;gap:20px;border-bottom:1px solid var(--line)}.brand{font-size:17px;font-weight:750;text-decoration:none;color:var(--ink)}nav{display:flex;flex-wrap:wrap;gap:22px;font-size:14px}nav a{color:var(--muted)}nav a[aria-current=page]{color:var(--accent);font-weight:700}main{padding-top:64px;padding-bottom:64px}.eyebrow{font-size:12px;letter-spacing:.12em;color:var(--accent);font-weight:750}h1{font-size:clamp(30px,5vw,49px);line-height:1.4;letter-spacing:-.03em;margin:14px 0 22px;max-width:820px}h2{font-size:22px;margin-top:38px;line-height:1.6}p,li{max-width:790px}.lead{font-size:19px;color:var(--muted);max-width:760px}.notice{border-left:3px solid var(--accent);padding:15px 22px;margin:32px 0;background:#e9eeea;max-width:800px}.flow{display:flex;align-items:center;gap:16px;padding:24px 0;margin:28px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}.flow span{flex:1}.flow small{display:block;color:var(--muted);font-size:12px}.flow b{color:var(--accent)}.links{display:flex;gap:25px;flex-wrap:wrap;margin:30px 0}.prose{max-width:810px}.meta{color:var(--muted);font-size:13px}footer{border-top:1px solid var(--line);font-size:13px;color:var(--muted);padding-bottom:38px}code{font-size:.92em;background:#e5e9e5;padding:2px 5px;border-radius:4px}ul{padding-left:1.3em}@media(max-width:600px){header{align-items:flex-start;flex-direction:column;padding:20px}main,footer{padding-left:20px;padding-right:20px}main{padding-top:38px}.flow{gap:8px;font-size:13px}nav{gap:18px}.lead{font-size:17px}}