/* Assay docs — brand-matched static site (indigo + gold hallmark).
   Both themes via prefers-color-scheme. Geist / JetBrains Mono. */
:root{
  --bg:#F7F8FB; --card:#FFFFFF; --ink:#1D1F29; --muted:#5C6272; --line:#E6E8EF;
  --accent:#4A3ED4; --accent-soft:#EFEEFB; --gold:#8F6912; --ok:#2E7D54;
  --code-bg:#F3F3F9; --radius:14px; --maxw:900px;
  --sans:"Geist",ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  --mono:"JetBrains Mono",ui-monospace,"SF Mono",Menlo,Consolas,monospace;
}
@media (prefers-color-scheme:dark){
  :root{ --bg:#0E0E15; --card:#181923; --ink:#E9EAF2; --muted:#949AAB; --line:#282A37;
    --accent:#9187F6; --accent-soft:#1C1D2A; --gold:#EAB94A; --ok:#5CC08B; --code-bg:#14151D; }
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--sans);
  line-height:1.65;-webkit-font-smoothing:antialiased;font-size:16px}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}

.nav{position:sticky;top:0;z-index:20;backdrop-filter:blur(12px);
  background:color-mix(in srgb,var(--bg) 84%,transparent);border-bottom:1px solid var(--line)}
.nav-in{max-width:1080px;margin:0 auto;display:flex;align-items:center;gap:18px;padding:12px 22px}
.brand{display:flex;align-items:center;gap:9px;font-weight:700;letter-spacing:-.01em;color:var(--ink)}
.brand:hover{text-decoration:none}
.brand img{width:26px;height:26px}
.nav-links{display:flex;gap:17px;margin-left:auto;flex-wrap:wrap}
.nav-links a{color:var(--muted);font-size:14px;font-weight:500}
.nav-links a:hover{color:var(--ink);text-decoration:none}
.nav-links a.active{color:var(--accent)}

.wrap{max-width:var(--maxw);margin:0 auto;padding:44px 22px 40px}
h1{font-size:clamp(28px,4.5vw,40px);letter-spacing:-.02em;line-height:1.15;margin:.15em 0 .35em;text-wrap:balance}
h2{font-size:22px;letter-spacing:-.01em;margin:2.1em 0 .5em}
h3{font-size:16.5px;margin:1.6em 0 .4em}
.lede{color:var(--muted);font-size:18px;max-width:64ch;line-height:1.6}
p,li{max-width:70ch}
ul,ol{padding-left:1.25em}
li{margin:.28em 0}
code{font-family:var(--mono);font-size:.87em;background:var(--code-bg);padding:.15em .42em;border-radius:6px;border:1px solid var(--line)}
pre{background:var(--code-bg);border:1px solid var(--line);border-radius:12px;padding:16px 18px;overflow-x:auto;
  font-family:var(--mono);font-size:13.5px;line-height:1.6;max-width:100%}
pre code{background:none;border:none;padding:0}
.eyebrow{font-size:12px;font-weight:600;letter-spacing:.14em;text-transform:uppercase;color:var(--accent)}

.hero{display:flex;flex-direction:column;align-items:center;text-align:center;gap:12px;padding:20px 0 4px}
.hero img.logo{width:84px;height:84px;filter:drop-shadow(0 8px 20px color-mix(in srgb,var(--accent) 30%,transparent))}
.hero h1{margin:.1em 0 0}
.badges{display:flex;gap:8px;flex-wrap:wrap;justify-content:center;margin-top:8px}
.badges img{height:20px}

.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:16px;margin:28px 0}
.card{display:block;background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  padding:18px 18px 20px;transition:border-color .15s ease,transform .15s ease,box-shadow .15s ease}
.card:hover{border-color:var(--accent);transform:translateY(-2px);text-decoration:none;
  box-shadow:0 10px 30px -14px color-mix(in srgb,var(--accent) 40%,transparent)}
.card .ic{width:32px;height:32px;display:grid;place-items:center;border-radius:9px;background:var(--accent-soft);color:var(--accent);margin-bottom:11px}
.card h3{margin:.1em 0 .35em;color:var(--ink);font-size:16px}
.card p{color:var(--muted);font-size:13.5px;margin:0;max-width:none}

.note{background:var(--accent-soft);border:1px solid var(--line);border-left:3px solid var(--accent);
  border-radius:10px;padding:12px 16px;font-size:14.5px;margin:20px 0}
.note b{color:var(--ink)}
.diagram{margin:22px 0;text-align:center}
.diagram img{max-width:100%;height:auto;border:1px solid var(--line);border-radius:12px;background:var(--card)}
.tag{display:inline-block;font-size:11px;font-weight:700;color:var(--gold);
  border:1px solid color-mix(in srgb,var(--gold) 42%,transparent);border-radius:999px;padding:2px 9px;letter-spacing:.03em}
hr{border:none;border-top:1px solid var(--line);margin:2.4em 0}

.pager{display:flex;justify-content:space-between;gap:14px;margin-top:40px;flex-wrap:wrap}
.pager a{font-size:14px;font-weight:500}
.foot{border-top:1px solid var(--line);margin-top:24px;padding:26px 22px;text-align:center;color:var(--muted);font-size:13px}
.foot a{color:var(--muted);text-decoration:underline}

@media (prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}