:root{color-scheme:light dark;--bg:#F5F4FA;--card:#fff;--ink:#191B3B;--sub:#596078;--brand:#4A6BC8;--line:#E5E5EF}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.8 -apple-system,BlinkMacSystemFont,"PingFang SC",sans-serif}main{max-width:780px;margin:48px auto;padding:36px;background:var(--card);border:1px solid var(--line);border-radius:28px}nav{display:flex;justify-content:space-between;gap:20px}a{color:var(--brand);text-underline-offset:4px}h1{font-size:32px;line-height:1.25;letter-spacing:-.03em;margin-top:36px}h2{font-size:23px;margin-top:36px}h3{font-size:17px;margin:24px 0 6px}p{margin:8px 0 16px}.muted,footer{color:var(--sub);font-size:14px}hr{border:0;border-top:1px solid var(--line);margin:36px 0}a:focus-visible{outline:3px solid var(--brand);outline-offset:4px}@media(max-width:620px){main{margin:12px;padding:24px;border-radius:24px}h1{font-size:28px}}@media(prefers-color-scheme:dark){:root{--bg:#0D0D11;--card:#19191F;--ink:#F7F7FC;--sub:#B1B5C8;--brand:#9AB6FF;--line:#363643}}