/* willytai.com — shared live-demo chassis (Foundry/Retsu).
   One design system for every interactive demo: IBM Plex, hairlines not shadows,
   single cobalt accent, mono for metadata. Accessible by default
   (focus-visible rings, button chips, sr-only labels, reduced-motion).
   Each demo links this first, then its own app.css for the center layout. */
/* Willy Tai Design System v2 (Ink & Oxblood) — chrome rebranded to oxblood/teal;
   functional STATE colours (ok/danger/warn/review) kept, because in the tools
   colour encodes pass/warn/fail and legibility comes first. */
@import url('https://fonts.googleapis.com/css2?family=Archivo:wght@400;500;600;700;800&family=IBM+Plex+Mono:wght@400;500;600&display=swap');
:root{
  --bg:#FAF8F5; --surface:#FFFFFF; --sand:#F2ECE3; --ink:#1A1A1A; --body:#7A736A; --body2:#33302B;
  --cap:#7A736A;           /* caption/metadata text */
  --muted:#9C9082; --faint:#DED7CB;   /* --faint = hairlines/decoration only */
  --line:#E4DDCE; --line2:#EDE7DE; --wash:#F2ECE3;
  --accent:#6E2532; --accent-d:#4E1A22; --tech:#1C8C8E; --sustain:#33544A; --brass:#B99A5B;
  --ok:#1F8A5B; --danger:#C0362C; --warn:#B26B16; --review:#6b58c7;   /* STATE colours — kept */
  --allow-bg:#E7F2EC; --esc-bg:#F7EEE0; --block-bg:#F7E7E5; --rev-bg:#ECE9F7;
  --sans:'Archivo',system-ui,sans-serif; --display:'Archivo',system-ui,sans-serif; --mono:'IBM Plex Mono',ui-monospace,monospace;
}
/* Dark / screen — Warm Graphite + Brass (never pure black). Chrome flips to brass;
   functional STATE colours kept but LIFTED so pass/warn/fail stay legible on dark. */
[data-theme="dark"]{
  --bg:#22201D; --surface:#2C2925; --sand:#2C2925; --ink:#EFE9DF; --body:#9E958A; --body2:#E3DDD2;
  --cap:#9E958A; --muted:#9E958A; --faint:#37342E;
  --line:#37342E; --line2:#33302B; --wash:#2C2925;
  --accent:#C9A868; --accent-d:#B99A5B; --tech:#6FB59B; --sustain:#7BB59E; --brass:#C9A868;
  --ok:#4FBE7E; --danger:#E06A54; --warn:#E0A94A; --review:#9B8AE0;
  --allow-bg:#233026; --esc-bg:#33301F; --block-bg:#33241F; --rev-bg:#2A2740;
}
*{box-sizing:border-box} html,body{margin:0} html{scroll-behavior:smooth}
body{background:var(--bg);color:var(--ink);font-family:var(--sans);font-size:15px;line-height:1.6;-webkit-font-smoothing:antialiased}
a{color:var(--accent);text-decoration:none} a:hover{text-decoration:underline}
.mono{font-family:var(--mono)} .tnum{font-variant-numeric:tabular-nums}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px;border-radius:3px}
.wrap{max-width:1140px;margin:0 auto;padding:0 40px}

/* header — links back, carries the name (no dead-ends) */
header.site{position:sticky;top:0;z-index:50;height:64px;background:color-mix(in srgb, var(--bg) 92%, transparent);backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}
header.site .wrap{display:flex;align-items:center;justify-content:space-between;height:100%;gap:14px}
.brand{display:flex;align-items:center;gap:11px;color:var(--ink)}
.brand:hover{text-decoration:none}
.brand .mk{width:30px;height:30px;border-radius:4px;background:var(--ink);color:#fff;display:grid;place-items:center;font-weight:600;font-size:11.5px;letter-spacing:.04em}
.brand .nm{font-weight:600;font-size:15px;letter-spacing:-.01em}
.brand .nm small{display:block;font-weight:400;font-size:11px;color:var(--cap);letter-spacing:0}
.hbar{display:flex;align-items:center;gap:14px}
.modelbadge{font-family:var(--mono);font-size:10.5px;color:var(--ok);background:var(--allow-bg);border:1px solid #CDE6D7;border-radius:30px;padding:4px 11px;white-space:nowrap}
.backlink{font-family:var(--mono);font-size:11.5px;color:var(--cap)} .backlink:hover{color:var(--ink)}

/* main */
main.wrap{padding-top:30px;padding-bottom:60px}
.lede{font-size:17px;color:var(--body);max-width:74ch;line-height:1.55} .lede b{color:var(--ink);font-weight:600}
.eyebrow{font-family:var(--mono);font-size:10.5px;text-transform:uppercase;letter-spacing:.08em;color:var(--accent)}
.syn{display:inline-flex;align-items:center;gap:6px;font-family:var(--mono);font-size:10px;text-transform:uppercase;letter-spacing:.05em;color:var(--warn);background:var(--esc-bg);border:1px solid #E9D9B8;border-radius:30px;padding:3px 10px}
h1.title{font-size:30px;font-weight:600;letter-spacing:-.02em;margin:8px 0 6px}
.muted{color:var(--cap)}

/* ask form */
.ask{display:flex;gap:10px;margin:22px 0 12px;max-width:760px}
.ask input{flex:1;font-family:var(--sans);font-size:15px;padding:13px 16px;border:1px solid var(--line);border-radius:6px;background:var(--surface);color:var(--ink)}
.ask input:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px rgba(41,98,217,.12)}
.btn{display:inline-flex;align-items:center;gap:8px;font-family:var(--sans);font-size:14px;font-weight:500;padding:13px 22px;border-radius:6px;border:1px solid var(--ink);background:var(--ink);color:var(--bg);cursor:pointer}
.btn:hover{background:var(--accent);border-color:var(--accent)}
.btn.ghost{background:var(--surface);color:var(--ink)} .btn.ghost:hover{background:var(--wash);color:var(--ink);border-color:var(--ink)}
.btn.sm{padding:8px 14px;font-size:12.5px}
.btn.danger{border-color:#E5C9C5;background:var(--surface);color:var(--danger)} .btn.danger:hover{background:var(--block-bg);border-color:var(--danger)}
.btn:disabled{opacity:.45;cursor:not-allowed}

/* chips — real buttons (keyboard reachable) */
.chips{display:flex;flex-wrap:wrap;gap:8px;margin:6px 0 4px}
.chip{font-family:var(--mono);font-size:12px;color:var(--body2);background:var(--surface);border:1px solid var(--line);border-radius:30px;padding:7px 13px;cursor:pointer}
.chip:hover{border-color:var(--accent);color:var(--accent)}

/* panels */
.panel{border:1px solid var(--line);border-radius:8px;background:var(--surface);overflow:hidden}
.panel .ph{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:13px 18px;border-bottom:1px solid var(--line)}
.panel .ph h2,.panel .ph h3{margin:0;font-size:14px;font-weight:600;letter-spacing:-.01em}
.panel .pb{padding:18px}
.panel .ph .sub{font-family:var(--mono);font-size:10.5px;color:var(--cap)}

/* tiles */
.tiles{display:grid;grid-template-columns:repeat(4,1fr);border:1px solid var(--line);border-radius:8px;overflow:hidden;background:var(--surface)}
.tiles .t{padding:16px 18px;border-right:1px solid var(--line2)} .tiles .t:last-child{border-right:none}
.tiles .t .v{font-size:26px;font-weight:600;letter-spacing:-.01em;font-variant-numeric:tabular-nums} .tiles .t .v.bad{color:var(--danger)} .tiles .t .v.good{color:var(--ok)}
.tiles .t .l{font-family:var(--mono);font-size:10px;text-transform:uppercase;letter-spacing:.04em;color:var(--cap);margin-top:5px}

/* badges / dispositions */
.badge{font-family:var(--mono);font-size:10px;padding:2px 9px;border-radius:30px;white-space:nowrap;display:inline-block}
.b-ok{background:var(--allow-bg);color:var(--ok)} .b-block{background:var(--block-bg);color:var(--danger)}
.b-esc{background:var(--esc-bg);color:var(--warn)} .b-rev{background:var(--rev-bg);color:var(--review)} .b-neutral{background:var(--wash);color:var(--cap)}

/* tables */
.tbl{width:100%;border-collapse:collapse;font-size:12.5px}
.tbl th{text-align:left;font-family:var(--mono);font-size:9.5px;text-transform:uppercase;letter-spacing:.05em;color:var(--cap);font-weight:500;padding:9px 12px;border-bottom:1px solid var(--line);position:sticky;top:0;background:var(--surface)}
.tbl td{padding:9px 12px;border-bottom:1px solid var(--line2);vertical-align:top}
.tbl td.m{font-family:var(--mono);font-variant-numeric:tabular-nums}
.tbl tr.click{cursor:pointer} .tbl tr.click:hover{background:var(--wash)}
.scroll-x{overflow-x:auto}

/* citation / provenance strip */
.prov{display:flex;flex-wrap:wrap;gap:8px;align-items:center;padding:12px 0 2px;font-family:var(--mono);font-size:11px;color:var(--cap)}
.prov .ok{color:var(--ok)} .prov .abst{color:var(--warn)}
.prov .pill{background:var(--wash);border-radius:30px;padding:3px 9px;color:var(--body2)} .prov .pill b{color:var(--ink);font-weight:600}

/* hash-chained ledger */
.ledger{border:1px solid var(--line);border-radius:8px;overflow:hidden;background:var(--surface)}
.ledger .lh{display:flex;justify-content:space-between;align-items:center;padding:12px 15px;border-bottom:1px solid var(--line);font-size:13px;font-weight:600}
.ledger .lh .st{font-family:var(--mono);font-size:10.5px;display:flex;align-items:center;gap:6px;color:var(--ok)}
.ledger .lh .st.broken{color:var(--danger)} .ledger .lh .st .dot{width:6px;height:6px;border-radius:50%;background:currentColor}
.ledger .rows{max-height:260px;overflow-y:auto}
.ledger .row{display:grid;grid-template-columns:42px 1fr auto;gap:8px;padding:8px 15px;font-family:var(--mono);font-size:11px;border-top:1px solid var(--line2);align-items:center}
.ledger .row:first-child{border-top:none} .ledger .row.bad{background:#FBF1F0}
.ledger .row .hash{color:var(--cap);font-size:10px}
.ledger .lbtns{display:flex;gap:8px;padding:11px 15px;border-top:1px solid var(--line);flex-wrap:wrap}
.ledger .lnote{padding:10px 15px;border-top:1px solid var(--line2);font-family:var(--mono);font-size:10.5px;color:var(--cap)}

/* footer — never a dead end */
footer.appfoot{border-top:1px solid var(--line);background:var(--surface)}
footer.appfoot .wrap{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;padding-top:20px;padding-bottom:20px;font-family:var(--mono);font-size:11.5px;color:var(--cap)}
footer.appfoot a{color:var(--cap)} footer.appfoot a:hover{color:var(--ink)}

.note{font-size:12.5px;color:var(--body);background:var(--wash);border:1px solid var(--line);border-radius:6px;padding:11px 14px;line-height:1.55}
.note b{color:var(--ink)}
.row-flex{display:flex;gap:14px;align-items:flex-start;flex-wrap:wrap}

/* Responsive — handoff bands (tablet <=1023, mobile <=639, small <=359) */
html,body{overflow-x:clip}
@media(max-width:1023px){.wrap{padding:0 28px}.tiles{grid-template-columns:1fr 1fr}}
@media(max-width:639px){
  .wrap{padding:0 18px}
  header.site{height:auto}
  header.site .wrap{height:auto;min-height:64px;flex-wrap:wrap;gap:8px 10px;padding-top:10px;padding-bottom:10px}
  .ask{flex-direction:column}
  .ask .btn{width:100%;justify-content:center}
  .tiles{grid-template-columns:1fr 1fr}
  .row-flex{flex-direction:column}
}
@media(max-width:359px){.tiles{grid-template-columns:1fr}}
@media(prefers-reduced-motion:reduce){*{animation-duration:.001ms!important;transition-duration:.001ms!important}}

/* header site-nav (added 2026-07-04) */
.hnav{display:flex;gap:2px;align-items:center}
.hnav a{font-family:var(--sans);font-size:12px;font-weight:500;color:var(--cap);padding:6px 9px;border-radius:5px;white-space:nowrap}
.hnav a:hover{color:var(--ink);background:var(--wash)}
@media(max-width:640px){header.site .wrap{gap:8px}.hnav a{padding:6px 6px;font-size:11px}.modelbadge{display:none}.brand .nm small{display:none}}

/* ============================================================
   v2 · Ink & Oxblood chrome (Willy Tai Design System)
   Header, titles, tabs, buttons → oxblood/charcoal; state colours unchanged.
   ============================================================ */
.brand .mk{background:url(/assets/brand/wt-solid.png) center/contain no-repeat!important;color:transparent!important;width:34px;height:34px}
/* dark: cream knockout mark + relift the two hardcoded light tints that don't use tokens */
[data-theme="dark"] .brand .mk{background-image:url(/assets/brand/wt-solid-knockout.png)!important}
[data-theme="dark"] .syn{background:#3A2E24;border-color:#5A4A38}
[data-theme="dark"] .ledger .row.bad{background:#33231F}
.brand .nm{font-family:var(--display);font-weight:700;letter-spacing:-.01em}
h1,.title{font-family:var(--display);letter-spacing:-.02em}
.eyebrow{color:var(--accent)}
.syn{color:var(--accent);background:#F3EAE9;border-color:#E4C9C9}
/* tabs & primary buttons carry the oxblood accent */
.tabs [role=tab][aria-selected=true]{border-bottom-color:var(--accent)!important}
.btn{background:var(--ink)} .btn:hover{background:var(--accent);border-color:var(--accent)}
a{color:var(--accent)}