:root{color-scheme:light;--bg:#fff;--soft:#f6f6f7;--text:#3c3c43;--muted:#73737a;--border:#e7e7ea;--brand:#3451b2;--hover:#e9edfa;--header:rgba(255,255,255,.94)}:root[data-theme=dark]{color-scheme:dark;--bg:#1b1b1f;--soft:#202127;--text:#dfdfe4;--muted:#9898a2;--border:#313139;--brand:#a8b1ff;--hover:#30334d;--header:rgba(27,27,31,.94)}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:94px}body{margin:0;background:var(--bg);color:var(--text);font-family:Inter,-apple-system,BlinkMacSystemFont,"Segoe UI","Noto Sans SC","PingFang SC","Microsoft YaHei",sans-serif;font-size:16px;line-height:1.85;-webkit-font-smoothing:antialiased}a{color:var(--brand);text-decoration:none}button,input{font:inherit}button{cursor:pointer;background:var(--soft);border:1px solid var(--border);border-radius:8px;color:var(--text)}button:hover{color:var(--brand)}:focus-visible{outline:2px solid var(--brand);outline-offset:4px}.skip{position:fixed;top:-80px;left:16px;z-index:10;background:var(--bg);padding:8px}.skip:focus{top:8px}header{height:64px;position:fixed;inset:0 0 auto;z-index:5;background:var(--header);backdrop-filter:blur(12px);border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between;padding:0 32px}.brand{color:var(--text);font-size:16px;font-weight:650;letter-spacing:-.3px}.brand span{font-weight:400;color:var(--muted);margin-left:8px}.header-actions{display:flex;gap:22px;align-items:center}.home{font-size:14px;color:var(--text)}#theme{width:34px;height:28px;line-height:1}#menu{display:none}#sidebar{position:fixed;top:64px;bottom:0;left:0;width:272px;background:var(--soft);padding:30px 24px 20px 32px;overflow:auto;border-right:1px solid var(--border);z-index:4}.sidebar-label{font-size:11px;font-weight:650;letter-spacing:1.6px;color:var(--muted);margin-bottom:16px}.search-box{display:flex;align-items:center;gap:8px;background:var(--bg);border:1px solid var(--border);border-radius:7px;padding:5px 10px;margin-bottom:25px}.search-box input{width:100%;min-width:0;border:0;background:transparent;font-size:12px;color:var(--text);outline:none}.search-box kbd{font-size:11px;color:var(--muted)}.nav-year{font-size:12px;font-weight:700;letter-spacing:.5px;color:var(--text);margin:20px 0 6px}#timeline>a{display:block;padding:6px 10px;font-size:13px;line-height:1.55;color:var(--muted);border-radius:5px;margin-left:-10px}#timeline>a:hover,#timeline>a.active{background:var(--hover);color:var(--brand)}.sidebar-foot{border-top:1px solid var(--border);margin-top:28px;padding-top:16px;font-size:11px;color:var(--muted)}.layout{margin:64px 0 0 272px;display:flex;justify-content:center;gap:52px;padding:48px 40px 0}main{width:100%;max-width:760px;min-width:0}.eyebrow{font-size:11px;color:var(--brand);letter-spacing:1.7px;font-weight:650}.page-title{font-size:34px;line-height:1.4;letter-spacing:-1px;margin:12px 0 2px}.subtitle{font-size:22px;color:var(--muted);margin:0 0 20px;font-weight:450}.intro{font-size:15px;color:var(--muted);line-height:1.9}.meta{display:flex;flex-wrap:wrap;gap:20px;font-size:12px;color:var(--muted);padding:16px 0 28px;border-bottom:1px solid var(--border);margin-bottom:32px}.meta a{margin-left:auto}article h1{font-size:15px;font-weight:650;letter-spacing:1px;color:var(--brand);margin:64px 0 12px;border-top:1px solid var(--border);padding-top:28px}article h2{font-size:25px;line-height:1.55;letter-spacing:-.5px;margin:12px 0 24px}article h3{font-size:19px;line-height:1.6;margin:36px 0 14px;letter-spacing:-.2px}article h4{font-size:16px;margin:24px 0 10px}article p{margin:14px 0;overflow-wrap:anywhere}article ul{padding-left:22px;margin:16px 0 26px}article li{margin:8px 0}article strong{font-weight:650}article h1,article h2,article h3,article h4{position:relative;scroll-margin-top:90px}.anchor{margin-left:9px;color:var(--brand);opacity:0;font-size:.75em}h1:hover .anchor,h2:hover .anchor,h3:hover .anchor,h4:hover .anchor,.anchor:focus{opacity:1}.table-scroll{overflow:auto;border:1px solid var(--border);border-radius:8px;margin:24px 0}table{border-collapse:collapse;font-size:13px;line-height:1.75;min-width:600px;width:100%}th{background:var(--soft);font-weight:650;text-align:left}td,th{padding:12px 15px;border-bottom:1px solid var(--border);vertical-align:top}tr:last-child td{border-bottom:0}td:first-child{width:27%}td:nth-child(2){width:25%}tr:nth-child(even){background:var(--soft)}code{font-size:.88em;background:var(--soft);padding:2px 5px;border-radius:4px}blockquote{border-left:3px solid var(--border);padding-left:20px;color:var(--muted)}.katex-display{overflow-x:auto;overflow-y:hidden;padding:12px 0;font-size:.98em}.outline{width:210px;flex-shrink:0;position:sticky;top:100px;align-self:flex-start;max-height:calc(100vh - 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