:root{color-scheme:light;--ink:#182735;--muted:#64717d;--blue:#214ee7;--line:#dce3eb;--paper:#f5f7fa}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--paper);color:var(--ink);font:16px/1.85 system-ui,-apple-system,"Segoe UI","Microsoft YaHei",sans-serif}a{color:inherit;text-decoration:none}a:hover{color:var(--blue)}a:focus-visible{outline:3px solid var(--blue);outline-offset:5px}.skip{position:absolute;top:-100px;background:white;padding:10px}.skip:focus{top:0}.wrap{max-width:1120px;margin:auto;padding:0 40px}header{border-bottom:1px solid var(--line);background:#fff}.header{display:flex;align-items:center;justify-content:space-between;min-height:88px;gap:24px}.brand{font-size:20px;font-weight:750;letter-spacing:.02em}.brand span{display:inline-grid;place-items:center;width:34px;height:34px;margin-right:12px;background:var(--blue);color:white;font-size:17px;border-radius:6px}nav{display:flex;gap:28px;font-size:15px}nav a[aria-current=page]{color:var(--blue)}main{padding-top:58px;padding-bottom:80px}.eyebrow{font-size:13px;letter-spacing:.13em;color:var(--blue);font-weight:700}h1{font-size:clamp(30px,4vw,46px);line-height:1.3;letter-spacing:-.04em;margin:12px 0 16px}h2{line-height:1.5}p{margin:0 0 20px}.intro{max-width:620px;color:var(--muted);font-size:17px}.layout{display:grid;grid-template-columns:minmax(0,1fr) 260px;gap:64px;margin-top:52px}.section-head{display:flex;justify-content:space-between;align-items:center;border-bottom:2px solid var(--ink);padding-bottom:14px}.section-head h2{margin:0;font-size:19px}.section-head span{font-size:13px;color:var(--muted)}.entry{padding:29px 0;border-bottom:1px solid var(--line)}.meta{font-size:13px;color:var(--muted);display:flex;gap:16px;align-items:center}.tag{color:var(--blue);font-weight:650}.entry h2{font-size:23px;margin:9px 0 9px;line-height:1.45}.entry p{color:var(--muted);font-size:15px;line-height:1.8;margin:0 0 12px}.read{font-size:14px;font-weight:650;color:var(--blue)}aside{padding-top:3px}aside h2{font-size:16px;margin:0 0 18px}aside p{font-size:14px;color:var(--muted)}.side-block{border-top:1px solid var(--line);padding-top:22px;margin-top:30px}.topics{list-style:none;margin:0;padding:0;font-size:14px}.topics li{padding:9px 0;border-bottom:1px solid var(--line);display:flex;justify-content:space-between}.topics span{color:var(--muted)}.note{border-left:3px solid var(--blue);padding:4px 0 4px 16px;font-size:14px;color:var(--muted)}footer{border-top:1px solid var(--line);font-size:13px;color:var(--muted);padding:25px 0}.footer{display:flex;justify-content:space-between;gap:15px}.article{max-width:760px}.article h1{font-size:clamp(28px,4vw,40px);margin-bottom:20px}.article .lead{font-size:18px;color:var(--muted);margin:28px 0 36px;padding-bottom:30px;border-bottom:1px solid var(--line)}.article h2{margin:38px 0 16px;font-size:24px}.article h3{font-size:18px;margin:26px 0 12px}.article p,.article li{line-height:1.95}.article a:not(.back){color:var(--blue);text-decoration:underline;text-underline-offset:4px}.back{display:inline-block;font-size:14px;color:var(--muted);margin-bottom:30px}pre{background:#142331;color:#e6eef8;padding:24px;border-radius:8px;overflow-x:auto;font-size:14px;line-height:1.8}code{font-family:Consolas,monospace}p code,li code{background:#e9edf3;padding:2px 5px;border-radius:3px;overflow-wrap:anywhere}.article ul,.article ol{padding-left:25px}.article-end{margin-top:48px;border-top:1px solid var(--line);padding-top:24px;color:var(--muted);font-size:14px}@media(max-width:800px){.wrap{padding:0 24px}.layout{grid-template-columns:1fr;gap:36px}aside{border-top:1px solid var(--line);padding-top:28px}.header{min-height:76px}.brand{font-size:17px}.brand span{margin-right:7px}nav{gap:16px;font-size:14px}main{padding-top:36px;padding-bottom:50px}.layout{margin-top:35px}.footer{flex-direction:column;gap:4px}.entry h2{font-size:21px}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}