:root{color-scheme:light;font-family:system-ui,-apple-system,"Segoe UI",sans-serif;color:#18202a;background:#f6f8fb}*{box-sizing:border-box}body{margin:0}main{max-width:820px;margin:0 auto;padding:48px 24px 72px}nav{display:flex;gap:16px;flex-wrap:wrap;margin:0 0 32px}a{color:#1358a8}h1{font-size:clamp(2rem,5vw,3.25rem);line-height:1.05}h2{margin-top:2rem}.notice{border:2px solid #b54708;background:#fff6ed;padding:16px;border-radius:12px}.card{background:#fff;border:1px solid #d9e0e8;border-radius:16px;padding:24px}code{overflow-wrap:anywhere}footer{margin-top:40px;color:#536273}