:root{--bg: #fbf8f5;--paper: #ffffff;--paper-warm: #f6f1ed;--ink: #2e2a29;--ink-soft: #5c5553;--muted: #857c79;--line: #e9e1dc;--line-strong: #d9cdc6;--rose: #c98b8b;--rose-deep: #9c5b5c;--rose-tint: #f6ebe9;--taupe: #b9aba3;--taupe-tint: #efe9e5;--radius: 14px;--radius-sm: 8px;--shadow: 0 1px 2px rgba(60, 40, 38, .05), 0 6px 20px rgba(60, 40, 38, .06);--shadow-hover: 0 2px 4px rgba(60, 40, 38, .06), 0 12px 32px rgba(60, 40, 38, .09);--font: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", "Source Han Sans SC", sans-serif;--mono: "SF Mono", ui-monospace, Menlo, Consolas, "Liberation Mono", monospace;--shell: 1120px;--gutter: 20px}*,*:before,*:after{box-sizing:border-box}html{-webkit-text-size-adjust:100%}body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--font);font-size:16px;line-height:1.75;-webkit-font-smoothing:antialiased}img,svg{max-width:100%}a{color:var(--rose-deep);text-underline-offset:3px;text-decoration-thickness:1px}a:hover{color:var(--ink)}h1,h2,h3{font-weight:600;letter-spacing:-.015em;line-height:1.3;color:var(--ink)}.num{font-family:var(--mono);font-variant-numeric:tabular-nums}.muted{color:var(--muted)}.shell{max-width:var(--shell);margin:0 auto;padding:0 var(--gutter)}.skip{position:absolute;left:-9999px}.skip:focus{left:12px;top:12px;background:var(--paper);padding:8px 12px;z-index:10;border-radius:6px}:focus-visible{outline:2px solid var(--rose);outline-offset:2px}.mast{border-bottom:1px solid var(--line);background:#fbf8f5eb;backdrop-filter:saturate(1.2) blur(8px);position:sticky;top:0;z-index:5}.mast .shell{display:flex;align-items:center;justify-content:space-between;gap:16px;min-height:64px;flex-wrap:wrap}.wordmark{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink);min-width:0}.wordmark img{flex:none;border-radius:8px}.wordmark b{display:block;font-size:16px;font-weight:600;letter-spacing:.01em}.wordmark small{display:block;font-family:var(--mono);font-size:11px;letter-spacing:.12em;color:var(--muted)}.nav{display:flex;gap:4px;flex-wrap:wrap}.nav a{text-decoration:none;color:var(--ink-soft);font-size:15px;padding:8px 12px;border-radius:999px}.nav a:hover{background:var(--paper-warm);color:var(--ink)}.nav a[aria-current=page]{color:var(--ink);background:var(--rose-tint)}.page{padding:44px 0 16px}.eyebrow{font-family:var(--mono);font-size:12px;letter-spacing:.16em;color:var(--muted);text-transform:uppercase;margin:0 0 10px}.crumbs{font-size:14px;color:var(--muted);margin:0 0 12px}.crumbs a{color:var(--muted)}h1{font-size:clamp(28px,4.2vw,42px);margin:0 0 12px}.lede{font-size:18px;color:var(--ink-soft);max-width:40em;margin:0}.meta{color:var(--muted);font-size:14px;margin:0}.section{padding:28px 0}.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-height:44px;padding:0 18px;border-radius:999px;border:1px solid var(--line-strong);background:var(--paper);color:var(--ink);font:inherit;font-size:15px;text-decoration:none;cursor:pointer;transition:background .15s,border-color .15s,box-shadow .15s,transform .15s}.btn:hover{border-color:var(--rose);color:var(--ink);box-shadow:var(--shadow)}.btn.solid{background:var(--ink);border-color:var(--ink);color:#fff}.btn.solid:hover{background:#45403e;color:#fff}.btn.rose{background:var(--rose-deep);border-color:var(--rose-deep);color:#fff}.btn.rose:hover{background:#874b4c;color:#fff}.tablewrap{overflow-x:auto;-webkit-overflow-scrolling:touch;border:1px solid var(--line);border-radius:var(--radius-sm);background:var(--paper)}table{width:100%;border-collapse:collapse;font-size:15px}th,td{text-align:left;padding:10px 14px;border-bottom:1px solid var(--line);vertical-align:top}th{font-size:13px;font-weight:500;color:var(--muted);background:var(--paper-warm);white-space:nowrap}tbody tr:last-child td{border-bottom:0}caption{text-align:left;font-size:13px;color:var(--muted);padding:10px 14px 0}.hero{padding:40px 0 8px}.hero h1{margin-bottom:8px}.hero .lede{font-size:17px}.bounds{display:flex;flex-wrap:wrap;gap:8px;margin:16px 0 0;padding:0;list-style:none}.bounds li{font-size:13px;color:var(--ink-soft);border:1px solid var(--line);border-radius:999px;padding:3px 12px;background:var(--paper)}.tool{margin-top:24px}.inputs{display:grid;grid-template-columns:1fr 1fr;gap:16px}.sample{background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden;display:flex;flex-direction:column;min-width:0}.sample-h{display:flex;align-items:center;justify-content:space-between;gap:8px;padding:12px 16px;border-bottom:1px dashed var(--line-strong)}.sample-h label{font-weight:600;font-size:15px}.sample-h .code{font-family:var(--mono);font-size:11px;letter-spacing:.14em;color:var(--muted)}.sample-h .dot{display:inline-block;width:8px;height:8px;border-radius:50%;background:var(--rose);margin-right:8px;vertical-align:1px}.sample.b .sample-h .dot{background:var(--taupe)}.sample textarea{border:0;resize:vertical;min-height:170px;width:100%;padding:14px 16px;font:inherit;font-size:15px;line-height:1.7;color:var(--ink);background:transparent}.sample textarea:focus{outline:none;background:#fffdfc}.sample:focus-within{border-color:var(--rose)}.sample-f{font-size:12px;color:var(--muted);padding:8px 16px 12px;border-top:1px solid var(--line);font-family:var(--mono)}.controls{display:flex;flex-wrap:wrap;align-items:center;gap:10px 14px;margin:16px 0 0}.controls label{font-size:14px;color:var(--ink-soft);display:inline-flex;align-items:center;gap:8px}.controls select{font:inherit;font-size:15px;min-height:40px;padding:0 10px;border:1px solid var(--line-strong);border-radius:8px;background:var(--paper);color:var(--ink)}.controls .spacer{flex:1}.privacy{font-size:13px;color:var(--muted);margin:10px 0 0}.status-line{font-size:13px;color:var(--muted);min-height:1.5em;margin:6px 0 0}.result{margin-top:28px}.result-h{display:flex;align-items:baseline;justify-content:space-between;gap:12px;flex-wrap:wrap;border-top:1px solid var(--line);padding-top:22px}.result-h h2{font-size:22px;margin:0}.result-h .tag{font-family:var(--mono);font-size:12px;color:var(--muted);letter-spacing:.08em}.stats{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:12px;margin:18px 0 8px}.stat{background:var(--paper);border:1px solid var(--line);border-radius:var(--radius-sm);padding:12px 14px;display:flex;flex-direction:column;gap:2px;min-width:0}.stat .k{font-size:13px;color:var(--ink-soft)}.stat .v{font-size:28px;line-height:1.2;color:var(--ink)}.stat .v small{font-size:15px;color:var(--muted)}.stat .s{font-size:12px;color:var(--muted)}.stat-rose{background:var(--rose-tint);border-color:#ecd6d3}.stat-rose .v{color:var(--rose-deep)}.rblock{margin:26px 0 0}.rblock h3{font-size:18px;margin:0 0 10px;display:flex;align-items:center;gap:8px}.rblock h3 .count{font-size:13px;font-weight:500;color:var(--muted);background:var(--paper-warm);padding:0 8px;border-radius:999px}.rnote{font-size:14px;color:var(--ink-soft);margin:10px 0 0}.empty{color:var(--muted);font-size:14px}.key{display:inline-block;width:10px;height:14px;border-radius:2px;vertical-align:-2px;margin:0 4px 0 6px}.key-common{background:var(--rose)}.key-only{background:var(--taupe)}.bc{display:flex;align-items:stretch;gap:10px;margin:12px 0 0}.bc-tag{flex:none;width:28px;display:flex;align-items:center;justify-content:center;font-family:var(--mono);font-size:13px;color:var(--ink-soft);border:1px solid var(--line);border-radius:6px;background:var(--paper)}.bc-bars{flex:1;min-width:0;display:flex;flex-wrap:wrap;gap:3px;align-items:flex-end;padding:10px 12px;background:var(--paper);border:1px solid var(--line);border-radius:var(--radius-sm)}.bc-bar{position:relative;width:22px;height:46px;border-radius:3px;display:flex;align-items:flex-end;justify-content:center}.bc-bar b{font-size:10px;font-weight:400;color:#ffffffeb;padding-bottom:3px}.bc-bar.is-common{background:var(--rose)}.bc-bar.is-only{background:var(--taupe)}.bc-bar.is-trace{height:30px;opacity:.55}.bc-bar.is-raw{background-image:repeating-linear-gradient(135deg,rgba(255,255,255,.45) 0 3px,transparent 3px 6px)}.bc-split{display:flex;align-items:flex-end;height:46px;padding:0 6px 0 8px;border-left:1px dashed var(--line-strong);margin-left:4px}.bc-split i{font-style:normal;font-size:11px;color:var(--muted);writing-mode:horizontal-tb;white-space:nowrap}.twin{display:grid;grid-template-columns:1fr 1fr;gap:16px}.card-lab{background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);padding:4px 0 8px;min-width:0}.lab-h{display:flex;justify-content:space-between;margin:0;padding:10px 16px;border-bottom:1px dashed var(--line-strong);font-size:14px;font-weight:600}.lab-h .num{font-size:12px;font-weight:400;color:var(--muted);letter-spacing:.08em}.ing{list-style:none;margin:0;padding:4px 16px}.ing li{display:flex;gap:10px;padding:7px 0;border-bottom:1px solid var(--line);font-size:15px;min-width:0}.ing li:last-child{border-bottom:0}.ing li>span:last-child{min-width:0;overflow-wrap:anywhere}.ing .pos{flex:none;width:26px;color:var(--muted);font-size:12px;padding-top:3px}.ing li.is-shared{color:var(--ink)}.ing li.is-shared .pos{color:var(--rose-deep)}.ing li.is-shared>span:last-child{box-shadow:inset 0 -6px 0 var(--rose-tint)}.ing em{display:block;font-style:normal;font-size:12px;color:var(--muted)}.ing em.z{display:inline;margin-left:8px}.chip{display:inline-block;font-size:12px;padding:1px 10px;border-radius:999px;background:var(--rose-tint);color:var(--rose-deep);white-space:nowrap}.pos-cell{white-space:nowrap;font-variant-numeric:tabular-nums;color:var(--ink-soft)}.why{display:block;font-size:12px;color:var(--muted);margin-top:2px}.chip-muted{background:var(--taupe-tint);color:var(--ink-soft)}.swaps{margin:8px 0 0;padding-left:20px;font-size:14px;color:var(--ink-soft)}.notes ul{margin:0;padding:14px 18px 14px 34px;background:var(--paper-warm);border-radius:var(--radius-sm);font-size:14px;color:var(--ink-soft)}.norm-details{background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);padding:0 16px 16px}.norm-details summary{cursor:pointer;padding:14px 0;font-weight:600;font-size:15px}.norm-details .tablewrap{margin-top:12px}table.norm td:first-child{width:44px;color:var(--muted)}.st{font-size:12px;white-space:nowrap;padding:1px 8px;border-radius:4px}.st-ok{color:var(--ink-soft);background:var(--paper-warm)}.st-map{color:var(--rose-deep);background:var(--rose-tint)}.st-raw{color:#7a5a2e;background:#f6eedf}.arrow{color:var(--muted);margin:0 4px}.cand{font-size:12px;color:var(--muted)}.result-empty{padding:18px;background:var(--paper);border:1px dashed var(--line-strong);border-radius:var(--radius);color:var(--ink-soft)}.canread{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-top:12px}.canread>div{background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);padding:18px 20px}.canread h3{font-size:16px;margin:0 0 8px;display:flex;align-items:center;gap:8px}.canread h3:before{content:"";width:8px;height:8px;border-radius:50%;background:var(--rose)}.canread .no h3:before{background:var(--taupe)}.canread ul{margin:0;padding-left:20px;color:var(--ink-soft);font-size:15px}.canread li{margin:4px 0}.sec-h{display:flex;align-items:baseline;gap:12px;margin:0 0 4px}.sec-h h2{font-size:22px;margin:0}.sec-h .num{font-size:12px;color:var(--muted);letter-spacing:.12em}.src{background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);padding:18px 20px;margin:14px 0 0;scroll-margin-top:84px}.src-h{display:flex;flex-wrap:wrap;justify-content:space-between;gap:6px 12px;margin:0 0 8px}.src-h b{font-size:16px}.src-h .num{font-size:12px;color:var(--muted)}.src blockquote{margin:10px 0;padding:10px 14px;border-left:3px solid var(--rose);background:var(--rose-tint);border-radius:0 6px 6px 0;font-size:15px}.src dl{display:grid;grid-template-columns:5.5em 1fr;gap:4px 12px;margin:0;font-size:14px}.src dt{color:var(--muted)}.src dd{margin:0;min-width:0;overflow-wrap:anywhere}.own{background:var(--paper-warm);border-radius:var(--radius);padding:6px 20px 14px;margin-top:14px}.own h3{font-size:16px;margin:16px 0 4px}.own h3 .badge{font-size:12px;font-weight:500;color:var(--rose-deep);background:var(--paper);border-radius:999px;padding:1px 8px;margin-left:8px}.own p{margin:0;color:var(--ink-soft);font-size:15px}.toc{display:flex;flex-wrap:wrap;gap:8px;margin:16px 0 0;padding:0;list-style:none}.toc a{display:inline-block;font-size:14px;padding:4px 12px;border-radius:999px;border:1px solid var(--line);background:var(--paper);text-decoration:none;color:var(--ink-soft)}.article-grid{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:48px;margin-top:28px;align-items:start}.prose{font-size:17px;line-height:1.85;min-width:0}.prose h2{font-size:23px;margin:40px 0 12px}.prose h3{font-size:19px;margin:28px 0 8px}.prose p{margin:0 0 16px}.prose ul,.prose ol{padding-left:22px;margin:0 0 16px}.prose li{margin:6px 0}.prose blockquote{margin:18px 0;padding:14px 18px;background:var(--rose-tint);border-left:3px solid var(--rose);border-radius:0 8px 8px 0;font-size:16px}.prose blockquote cite{display:block;margin-top:6px;font-style:normal;font-size:13px;color:var(--muted)}.prose .tablewrap{margin:18px 0}.prose table{font-size:15px}.prose code{font-family:var(--mono);font-size:.9em;background:var(--paper-warm);padding:1px 6px;border-radius:4px}.prose .refs{font-size:14px;color:var(--ink-soft);border-top:1px solid var(--line);padding-top:14px;margin-top:32px}.prose .refs li{overflow-wrap:anywhere}.aside{position:sticky;top:88px;background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);padding:18px 20px;font-size:15px}.aside h2{font-size:15px;margin:0 0 6px}.aside h2+p{margin-top:0}.aside ol{padding-left:18px;margin:0 0 12px;color:var(--ink-soft)}.aside p{color:var(--ink-soft)}.cards{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px;margin-top:20px}.card{display:block;background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);padding:20px 22px;text-decoration:none;color:var(--ink);transition:box-shadow .2s,transform .2s,border-color .2s}.card:hover{box-shadow:var(--shadow-hover);transform:translateY(-2px);border-color:var(--line-strong);color:var(--ink)}.card h2{font-size:19px;margin:6px 0 8px}.card p{margin:0;color:var(--ink-soft);font-size:15px}.card .bars{display:flex;gap:2px;margin-bottom:10px}.card .bars i{width:6px;height:18px;border-radius:2px;background:var(--taupe)}.card .bars i.r{background:var(--rose)}.about-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px;margin-top:16px}.about-grid>div{background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);padding:18px 20px}.about-grid h2{font-size:17px;margin:0 0 6px}.about-grid p{margin:0;color:var(--ink-soft);font-size:15px}.support{display:flex;align-items:center;justify-content:space-between;gap:16px 24px;flex-wrap:wrap;margin:48px 0 0;padding:18px 22px;background:var(--paper);border:1px solid var(--line);border-radius:var(--radius)}.support p{margin:0;font-size:14px;color:var(--ink-soft);max-width:46em}.footer{margin-top:40px;border-top:1px solid var(--line);padding:22px 0 36px;font-size:13px;color:var(--muted)}.footer .shell{display:flex;flex-wrap:wrap;justify-content:space-between;gap:10px 20px}.footer nav{display:flex;gap:16px;flex-wrap:wrap}.footer a{color:var(--muted)}@media(max-width:900px){.article-grid{grid-template-columns:minmax(0,1fr);gap:28px}.aside{position:static}.stats{grid-template-columns:repeat(3,minmax(0,1fr))}.about-grid{grid-template-columns:minmax(0,1fr)}}@media(max-width:680px){:root{--gutter: 16px}.inputs,.twin,.canread,.cards{grid-template-columns:minmax(0,1fr)}.stats{grid-template-columns:repeat(2,minmax(0,1fr))}.stat .v{font-size:24px}.mast .shell{min-height:0;padding-top:10px;padding-bottom:8px;gap:6px}.nav{margin-left:-10px}.nav a{padding:6px 10px;font-size:14px}.bc-bar{width:18px;height:40px}.bc-bar.is-trace{height:26px}.bc-split{height:40px}th,td{padding:9px 10px}.prose{font-size:16px}.src dl{grid-template-columns:minmax(0,1fr)}.src dt{margin-top:6px}}@media(prefers-reduced-motion:reduce){*{transition:none!important}}