:root{color-scheme:light dark;--paper:#f7f5ef;--ink:#243c35;--muted:#54675f;--line:#cad1c7;--accent:#275d48}*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font:17px/1.8 Georgia,'Noto Serif SC','Microsoft YaHei',serif}header,main,footer{width:min(100% - 40px,900px);margin:auto}header{padding:28px 0;display:flex;justify-content:space-between;gap:20px;border-bottom:1px solid var(--line)}a{color:var(--accent);text-underline-offset:5px}header a{font-family:'Microsoft YaHei',sans-serif;font-size:14px}main{padding:64px 0 80px}h1{font-size:clamp(36px,7vw,64px);line-height:1.2;letter-spacing:-1px;margin:0 0 24px;overflow-wrap:anywhere}h2{font-size:25px;line-height:1.45;margin:42px 0 12px}p,ul{max-width:730px}p{margin:12px 0} .lead{font-size:22px;line-height:1.65;max-width:680px}.meta{font:14px/1.7 'Microsoft YaHei',sans-serif;color:var(--muted)}footer{padding:24px 0 40px;border-top:1px solid var(--line);font-size:14px}nav{display:flex;gap:22px;flex-wrap:wrap}li{margin:7px 0}code{font-size:.85em;overflow-wrap:anywhere}details{margin-top:30px}summary{cursor:pointer;font-size:20px}a:focus-visible,summary:focus-visible{outline:3px solid var(--accent);outline-offset:5px}@media(max-width:540px){main{padding-top:38px}header{flex-direction:column;gap:10px}.lead{font-size:19px}}@media(prefers-color-scheme:dark){:root{--paper:#17221e;--ink:#e1e6db;--muted:#b1bfb2;--line:#44594c;--accent:#acd2af}}