:root{--bg:#f5f8f7;--card:#fff;--ink:#14231f;--muted:#5d716b;--line:#dfe8e5;--grid:#e9efed;--brand:#0f9d76;--soft:#e6f4ef;
  --s1:#2a78d6;--s2:#eb6834;--s3:#1baf7a;--good:#1a8f4a;--warn:#c27a00;--bad:#d9434b;--off:#c5d0cc;--code:#0d1b17}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){--bg:#0e1614;--card:#16211e;--ink:#e8f2ef;--muted:#93a9a2;--line:#24332f;--grid:#1f2c29;--soft:#1c2e29;
  --s1:#3987e5;--s2:#d95926;--s3:#199e70;--good:#3fb96d;--warn:#e0a100;--bad:#e66767;--off:#34443f}}
:root[data-theme="dark"]{--bg:#0e1614;--card:#16211e;--ink:#e8f2ef;--muted:#93a9a2;--line:#24332f;--grid:#1f2c29;--soft:#1c2e29;
  --s1:#3987e5;--s2:#d95926;--s3:#199e70;--good:#3fb96d;--warn:#e0a100;--bad:#e66767;--off:#34443f}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.65 "Be Vietnam Pro",system-ui,sans-serif}
a{color:var(--brand)}
code,pre{font-family:"JetBrains Mono",ui-monospace,monospace;font-size:13.5px}
code{background:var(--soft);padding:1px 6px;border-radius:6px}
pre{background:var(--code);color:#d6efe6;padding:16px;border-radius:14px;overflow-x:auto;line-height:1.5}
pre code{background:none;padding:0}
.top{position:sticky;top:0;z-index:20;display:flex;align-items:center;gap:12px;padding:10px 16px;background:color-mix(in srgb,var(--card) 92%,transparent);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.logo{font-weight:800;font-size:20px;text-decoration:none;color:var(--ink);white-space:nowrap}.logo b{color:var(--brand)}
.top nav{margin-left:auto;min-width:0;display:flex;gap:2px;overflow-x:auto;scrollbar-width:none}
.top nav a{white-space:nowrap;text-decoration:none;padding:6px 10px;border-radius:99px;font-weight:600;font-size:13px;color:var(--muted)}
.top nav a:hover{background:var(--soft);color:var(--ink)}.top nav a.on{background:var(--brand);color:#fff}
main{max-width:1060px;margin:0 auto;padding:28px 16px 60px}
section{scroll-margin-top:70px}
h1{font-size:clamp(28px,5vw,44px);line-height:1.15;margin:.2em 0}
h2{font-size:25px;margin:2em 0 .4em;padding-top:10px;border-top:1px solid var(--line)}
h3{margin:1.1em 0 .3em;font-size:18px}
.eyebrow{text-transform:uppercase;letter-spacing:.08em;font-size:12px;font-weight:700;color:var(--muted)}
.muted{color:var(--muted)}.small{font-size:13.5px}
.hero{border-radius:28px;padding:32px;background:linear-gradient(135deg,#0b7a5c,#0f9d76 50%,#2a78d6);color:#fff}
.hero .eyebrow{color:#fff;opacity:.85}.hero p{max-width:700px;opacity:.95}
.grid{display:grid;gap:14px;grid-template-columns:repeat(auto-fill,minmax(270px,1fr))}
.card{background:var(--card);border:1px solid var(--line);border-radius:18px;padding:18px}
.card h3{margin-top:0}
a.card{text-decoration:none;color:var(--ink);transition:transform .15s,border-color .15s}a.card:hover{transform:translateY(-3px);border-color:var(--brand)}
.chip{display:inline-block;font-size:12px;font-weight:700;padding:2px 9px;border-radius:99px;background:var(--soft);margin:2px 4px 2px 0;color:var(--ink)}
.tbl{overflow-x:auto;border-radius:14px;border:1px solid var(--line)}
table{width:100%;border-collapse:collapse;background:var(--card);min-width:600px}
td,th{text-align:left;padding:10px 12px;border-bottom:1px solid var(--line);vertical-align:top;font-size:14.5px}
th{background:var(--soft);font-size:13px}
th.sort{cursor:pointer;user-select:none}th.sort:hover{color:var(--brand)}
.note{border-left:5px solid var(--c,var(--brand));padding:12px 16px;border-radius:12px;background:var(--card);border-top:1px solid var(--line);border-right:1px solid var(--line);border-bottom:1px solid var(--line);margin:12px 0}
.foot{text-align:center;color:var(--muted);font-size:13px;padding:24px 16px;border-top:1px solid var(--line)}
.pager{display:flex;justify-content:space-between;gap:12px;margin-top:40px}
.pager a{flex:1;text-decoration:none;border:1px solid var(--line);background:var(--card);border-radius:14px;padding:12px 16px;color:var(--ink);font-weight:700}
.pager a span{display:block;font-size:12px;color:var(--muted);font-weight:600}.pager a.next{text-align:right}
ol li,ul li{margin:4px 0}
/* interactive widgets */
.viz{background:var(--card);border:1px solid var(--line);border-radius:18px;padding:16px;margin:14px 0}
.viz-title{font-weight:800;margin:0 0 2px}.viz-sub{color:var(--muted);font-size:13.5px;margin:0 0 10px}
.viz svg{width:100%;height:auto;display:block;overflow:visible}
.viz svg text{fill:var(--ink);font-family:inherit}
.controls{display:flex;flex-wrap:wrap;gap:8px 18px;align-items:center;margin:6px 0 12px}
.controls label{font-size:13.5px;font-weight:600;display:flex;align-items:center;gap:8px}
.controls input[type=range]{width:150px;accent-color:var(--brand)}
.controls output{font-variant-numeric:tabular-nums;min-width:3ch;font-weight:800}
.btns{display:flex;flex-wrap:wrap;gap:6px;margin:6px 0 12px}
.btns button,.btn{font:inherit;font-size:13.5px;font-weight:700;border:1px solid var(--line);background:var(--soft);color:var(--ink);border-radius:99px;padding:6px 13px;cursor:pointer}
.btns button.on{background:var(--brand);color:#fff;border-color:var(--brand)}
.btns button:focus-visible,.node:focus-visible{outline:3px solid var(--s1);outline-offset:2px}
.panel{border-radius:14px;background:var(--soft);padding:12px 16px;margin-top:10px;min-height:60px}
.panel h4{margin:0 0 4px}
.legend{display:flex;flex-wrap:wrap;gap:14px;font-size:13px;color:var(--muted);margin:0 0 6px}
.legend i{display:inline-block;width:12px;height:12px;border-radius:3px;margin-right:6px;vertical-align:-1px}
.node{cursor:pointer}.node rect,.node circle,.node path{transition:opacity .2s,stroke-width .2s}
.node:hover rect,.node:hover circle{stroke-width:3}
.dim{opacity:.38}
details.data{margin-top:8px;font-size:13px}details.data summary{cursor:pointer;color:var(--muted);font-weight:600}
details.data table{min-width:0;margin-top:6px}details.data td,details.data th{padding:4px 8px;font-size:12.5px}
.qc-tip{position:fixed;z-index:50;pointer-events:none;background:var(--card);color:var(--ink);border:1px solid var(--line);box-shadow:0 6px 24px #0003;border-radius:10px;padding:8px 10px;font-size:13px;line-height:1.45;max-width:280px;opacity:0;transition:opacity .1s}
.qc-tip b{font-weight:800}.qc-tip .sw{display:inline-block;width:10px;height:10px;border-radius:3px;margin-right:6px}
.bars .row{display:grid;grid-template-columns:minmax(110px,190px) 1fr auto;gap:10px;align-items:center;margin:6px 0;font-size:14px;cursor:default}
.bars .track{height:18px;background:var(--grid);border-radius:4px;overflow:hidden}
.bars .fill{height:100%;border-radius:0 4px 4px 0;transition:width .35s}
.bars .val{font-variant-numeric:tabular-nums;font-weight:700;font-size:13px;min-width:60px;text-align:right}
.stat{display:flex;flex-wrap:wrap;gap:12px;margin:8px 0}
.stat div{flex:1 1 140px;background:var(--soft);border-radius:14px;padding:10px 14px}
.stat b{display:block;font-size:24px;font-variant-numeric:tabular-nums}.stat span{font-size:12.5px;color:var(--muted);font-weight:600}
.dots{letter-spacing:2px;color:var(--brand);white-space:nowrap}.dots s{color:var(--off);text-decoration:none}
.check{display:flex;gap:10px;align-items:flex-start;padding:10px 12px;border-radius:12px;background:var(--card);border:1px solid var(--line);margin:6px 0;cursor:pointer}
.check input{margin-top:5px;accent-color:var(--brand);width:18px;height:18px}
.check.done span{text-decoration:line-through;color:var(--muted)}
@media (max-width:640px){.hero{padding:22px}.bars .row{grid-template-columns:96px 1fr auto}.controls input[type=range]{width:120px}}