:root{
  --bg:#EAEEF2; --panel:#FFFFFF; --panel-2:#F4F6F9; --ink:#17202D; --ink-2:#4B5668; --ink-3:#7A8496;
  --line:#D3DAE2; --accent:#2F5BEA; --accent-soft:#DCE4FD; --on-accent:#FFFFFF;
  --display:"Unbounded","Arial Rounded MT Bold",system-ui,sans-serif;
  --body:"Atkinson Hyperlegible",system-ui,-apple-system,"Segoe UI",sans-serif;
  --mono:"JetBrains Mono",ui-monospace,"SF Mono",Menlo,monospace;
}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){color-scheme:dark;
    --bg:#0E1218; --panel:#161B24; --panel-2:#1C222D; --ink:#E8EDF4; --ink-2:#A3AEBF; --ink-3:#737E90;
    --line:#2A3241; --accent:#7090FF; --accent-soft:#232D4A; --on-accent:#0E1218;}
}
:root[data-theme="dark"]{color-scheme:dark;
  --bg:#0E1218; --panel:#161B24; --panel-2:#1C222D; --ink:#E8EDF4; --ink-2:#A3AEBF; --ink-3:#737E90;
  --line:#2A3241; --accent:#7090FF; --accent-soft:#232D4A; --on-accent:#0E1218;}

*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--ink);font:17px/1.6 var(--body);padding-bottom:env(safe-area-inset-bottom,0px)}
a{color:var(--accent)}
.bar{position:sticky;top:0;z-index:5;background:var(--bg);border-bottom:1px solid var(--line);padding-top:env(safe-area-inset-top,0px)}
.bar-in{max-width:820px;margin:0 auto;padding:12px 16px;display:flex;gap:14px;align-items:baseline;flex-wrap:wrap}
.bar a{text-decoration:none;font-weight:700;color:var(--ink-2)}
.bar .brand{font-family:var(--display);font-size:19px;color:var(--ink);margin-right:auto}
.wrap{max-width:820px;margin:0 auto;padding-inline:16px;padding-block:24px 56px}
.doc{background:var(--panel);border-radius:12px;padding:28px 32px}
.doc h1,.doc h2,.doc h3{text-wrap:balance;line-height:1.25}
.doc h1{font-family:var(--display);font-weight:700;font-size:30px;margin:0 0 18px}
.doc h2{font-family:var(--display);font-weight:500;font-size:21px;margin:34px 0 12px}
.doc h3{font-size:18px;margin:24px 0 8px}
.doc p,.doc ul,.doc ol{max-width:65ch}
.doc li{margin:4px 0}
.doc hr{border:0;border-top:1px solid var(--line);margin:30px 0}
.doc code{font-family:var(--mono);font-size:.88em;background:var(--panel-2);border-radius:4px;padding:1px 5px}
.doc pre{background:var(--panel-2);border-radius:8px;padding:14px 16px;overflow-x:auto;font-size:15px;line-height:1.5}
.doc pre code{background:none;padding:0;font-size:inherit}
.doc .highlight{overflow-x:auto}
.doc table{border-collapse:collapse;display:block;overflow-x:auto;max-width:100%;font-size:15px}
.doc th,.doc td{border:1px solid var(--line);padding:6px 10px;text-align:left;vertical-align:top}
.doc th{background:var(--panel-2)}
.doc ul.contains-task-list{list-style:none;padding-left:4px}
.doc .task-list-item input{width:18px;height:18px;margin:0 8px 0 0;vertical-align:-3px;accent-color:var(--accent)}
.doc .anchor,.doc .octicon{display:none}
.doc .markdown-heading{position:relative}
.pn{display:flex;justify-content:space-between;gap:12px;margin-top:20px;flex-wrap:wrap}
.pn a{display:grid;background:var(--panel);border-radius:10px;padding:12px 16px;text-decoration:none;color:var(--ink);min-width:0;flex:1 1 220px}
.pn a.next{text-align:right}
.pn small{color:var(--ink-3);font-size:12px;letter-spacing:.08em;text-transform:uppercase}
.pn b{font-weight:700}
.hint{color:var(--ink-3);font-size:14px;margin-top:14px}
.dl{display:inline-flex;align-items:center;gap:6px;background:var(--accent);color:var(--on-accent)!important;border-radius:999px;padding:5px 14px;font-weight:700;font-size:14px;text-decoration:none}
.dl-row{display:flex;justify-content:flex-end;margin:0 0 12px}
.slp{display:none}
.intro .dl{margin-top:14px}
@media (max-width:560px){.doc{padding:20px 16px}.doc h1{font-size:24px}}
@page{size:A4;margin:15mm 14mm}
@media print{
  :root,:root:not([data-theme="light"]),:root[data-theme="dark"]{color-scheme:light;--bg:#fff;--panel:#fff;--panel-2:#f3f3f3;--ink:#000;--ink-2:#222;--ink-3:#555;--line:#bbb}
  .bar,.pn,.hint,.dl{display:none}
  .slp{display:flex;align-items:center;justify-content:space-between;gap:16px;border:1.5px solid #000;border-radius:8px;padding:8px 12px;margin:0 0 18px;break-inside:avoid}
  .slp-t{display:grid;gap:1px;font-size:13px;line-height:1.35}
  .slp-t b{font-family:var(--display);font-size:16px}
  .slp-t .u{font-family:var(--mono);font-weight:700;font-size:13px}
  .slp .qr{width:22mm;height:22mm;flex:none}
  .slp .qr svg{width:100%;height:100%;display:block}.wrap{padding:0}.doc{padding:0}
  .doc pre,.doc table,.doc li,.doc .highlight{break-inside:avoid}.doc h1,.doc h2,.doc h3,.doc .markdown-heading,.doc .markdown-heading+p,.doc p:has(+ .highlight),.doc p:has(+ pre){break-after:avoid;page-break-after:avoid}
}
/* index */
.intro h1{font-family:var(--display);font-weight:700;font-size:32px;margin:0 0 6px}
.intro p{color:var(--ink-2);max-width:60ch;margin:0}
.grp{margin-top:30px}
.grp h2{font-size:12px;letter-spacing:.1em;text-transform:uppercase;color:var(--ink-3);margin:0 0 10px}
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:10px}
.card{display:grid;gap:4px;background:var(--panel);border-radius:10px;padding:14px 16px;text-decoration:none;color:var(--ink);border:1px solid transparent}
.card:hover{border-color:var(--accent)}
.card .t{font-weight:700;font-size:17px}
.card .d{font-size:14px;color:var(--ink-2);line-height:1.45}
.card .s{font-family:var(--mono);font-size:12px;color:var(--ink-3)}
a:focus-visible{outline:2px solid var(--accent);outline-offset:2px}