/* Site frame. Swiss editorial system from the ui-ux-pro-max skill:
   Newsreader for headings, Public Sans for everything else, one blue accent, hairline rules, no shadows. */
:root {
  --bg: #F8FAFC;
  --surface: #FFFFFF;
  --tint: #F1F5F9;     /* hover rows */
  --ink: #0F172A;
  --mute: #475569;     /* 7.6:1 on --bg */
  --faint: #94A3B8;    /* decoration only, never body text */
  --hair: #E2E8F0;
  --line-strong: #CBD5E1;
  --primary: #1E3A8A;  /* knowledge blue */
  --primary-soft: #E0E7FF;
  --on-primary: #FFFFFF;
  --link: #1D4ED8;
  --ok: #047857;
  --ok-soft: #ECFDF5;
  --bad: #B91C1C;
  --bad-soft: #FEF2F2;
  --ring: #2563EB;
  --radius: 6px;
  --pad: 40px;
  --serif: 'Newsreader', Georgia, serif;
  --sans: 'Public Sans', system-ui, -apple-system, sans-serif;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0B1120; --surface: #111827; --tint: #1E293B; --ink: #E2E8F0; --mute: #94A3B8; --faint: #64748B;
    --hair: #1E293B; --line-strong: #334155; --primary: #93C5FD; --primary-soft: #172554; --on-primary: #0B1120;
    --link: #93C5FD; --ok: #34D399; --ok-soft: #052E1F; --bad: #F87171; --bad-soft: #2A0E0E; --ring: #60A5FA;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: var(--sans); font-size: 16px; line-height: 1.5;
  background: var(--bg); color: var(--ink);
  min-height: 100vh; min-height: 100dvh;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--link); text-underline-offset: 3px; text-decoration-thickness: 1px; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 2px solid var(--ring); outline-offset: 2px; border-radius: 2px; }
button { font: inherit; color: inherit; }
.mute { color: var(--mute); }
.small { font-size: 13px; }
.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }

/* top bar: logo | nav | meta */
.top {
  display: flex; align-items: center; gap: 28px;
  padding: 12px var(--pad); border-bottom: 1px solid var(--hair); background: var(--surface);
}
.logo { display: flex; align-items: center; gap: 10px; color: var(--ink); text-decoration: none; font-weight: 700; font-size: 16px; letter-spacing: -0.2px; }
.logo img { width: 28px; height: 28px; border-radius: 4px; flex: none; }
.nav { display: flex; gap: 2px; }
.nav a {
  display: inline-flex; align-items: center; min-height: 40px; padding: 0 12px; border-radius: var(--radius);
  color: var(--mute); text-decoration: none; font-size: 14px; font-weight: 500; transition: color .15s, background-color .15s;
}
.nav a:hover { color: var(--ink); background: var(--tint); }
.nav a[aria-current] { color: var(--ink); font-weight: 600; box-shadow: inset 0 -2px 0 var(--primary); border-radius: 0; }
.top .meta { margin-left: auto; color: var(--mute); font-size: 14px; font-variant-numeric: tabular-nums; display: flex; gap: 6px; }
.top .meta b { color: var(--ink); font-weight: 600; }

.sheet { max-width: 1240px; margin: 0 auto; padding: 0 var(--pad); }
.narrow { max-width: 760px; }

.disclaimer { max-width: 620px; padding: 0 0 28px; font-size: 13px; line-height: 1.5; color: var(--mute); }
.disclaimer a { color: var(--mute); }
.disclaimer a:hover { color: var(--ink); }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 10px; min-height: 44px; padding: 0 20px;
  border: 1px solid transparent; border-radius: var(--radius); cursor: pointer;
  font-weight: 600; font-size: 15px; text-decoration: none; transition: background-color .15s, border-color .15s;
}
.btn-primary { background: var(--primary); color: var(--on-primary); }
.btn-primary:hover { background: color-mix(in srgb, var(--primary) 86%, var(--ink)); }
.btn-ghost { background: transparent; border-color: var(--line-strong); color: var(--ink); }
.btn-ghost:hover { background: var(--tint); }
.icon-btn {
  width: 40px; height: 40px; flex: none; display: inline-flex; align-items: center; justify-content: center;
  background: transparent; border: 1px solid var(--hair); border-radius: var(--radius); color: var(--ink); cursor: pointer;
}
.icon-btn:hover { background: var(--tint); }
.icon-btn svg { width: 18px; height: 18px; }

/* ---------- quiz page ---------- */
.quiz { padding: 48px 0 24px; }
.progress { display: flex; align-items: center; gap: 16px; font-size: 14px; color: var(--mute); font-variant-numeric: tabular-nums; }
.progress .bar { flex: 1; height: 4px; background: var(--hair); border-radius: 2px; overflow: hidden; }
.progress .bar i { display: block; height: 100%; background: var(--primary); transition: width .3s ease-out; }
.eyebrow { margin-top: 32px; font-size: 14px; font-weight: 600; color: var(--primary); }
.q { margin-top: 8px; font-family: var(--serif); font-weight: 500; font-size: clamp(26px, 3.4vw, 36px); line-height: 1.2; letter-spacing: -0.4px; text-wrap: balance; }

.opts { display: grid; gap: 10px; margin-top: 28px; }
.opt {
  width: 100%; display: flex; align-items: center; gap: 14px; min-height: 56px; padding: 10px 16px;
  background: var(--surface); border: 1px solid var(--hair); border-radius: var(--radius);
  text-align: left; cursor: pointer; transition: border-color .15s, background-color .15s;
}
.opt .key {
  width: 28px; height: 28px; flex: none; display: flex; align-items: center; justify-content: center;
  border: 1px solid var(--line-strong); border-radius: 4px; font-size: 13px; font-weight: 600; color: var(--mute);
}
.opt .txt { flex: 1; font-size: 17px; font-weight: 500; }
.opt .mark { width: 20px; height: 20px; flex: none; }
.opt:hover:not(:disabled) { border-color: var(--primary); }
.opt:hover:not(:disabled) .key { border-color: var(--primary); color: var(--primary); }
.opt:disabled { cursor: default; }
.opt:disabled:not(.right):not(.wrong) { opacity: 0.55; }
.opt.right { border-color: var(--ok); background: var(--ok-soft); }
.opt.right .key { background: var(--ok); border-color: var(--ok); color: var(--surface); }
.opt.right .mark { color: var(--ok); }
.opt.wrong { border-color: var(--bad); background: var(--bad-soft); }
.opt.wrong .key { border-color: var(--bad); color: var(--bad); }
.opt.wrong .mark { color: var(--bad); }

.answer { margin-top: 28px; padding-top: 24px; border-top: 1px solid var(--hair); }
.answer .verdict { font-size: 14px; font-weight: 600; }
.answer .verdict.ok { color: var(--ok); }
.answer .verdict.no { color: var(--bad); }
.answer .big { margin-top: 4px; font-family: var(--serif); font-weight: 500; font-size: clamp(30px, 4vw, 40px); line-height: 1.15; }
.answer .why { margin-top: 12px; font-size: 16px; line-height: 1.6; max-width: 640px; }
.answer .src { margin-top: 12px; font-size: 14px; color: var(--mute); overflow-wrap: anywhere; }
.answer .btn { margin-top: 24px; }
.answer .btn svg { width: 16px; height: 16px; }

.done { padding: 72px 0 32px; }
.done .score { font-family: var(--serif); font-weight: 500; font-size: clamp(56px, 9vw, 96px); line-height: 1; font-variant-numeric: tabular-nums; }
.done .score span { color: var(--faint); }
.done .lead { margin-top: 16px; max-width: 520px; color: var(--mute); font-size: 17px; }
.done .row { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }

.foot { margin-top: 40px; padding-top: 20px; border-top: 1px solid var(--hair); }

@media (max-width: 760px) {
  :root { --pad: 16px; }
  .top { gap: 12px; }
  .logo span { display: none; }
  .nav a { padding: 0 10px; white-space: nowrap; }
  .top .meta { white-space: nowrap; font-size: 13px; }
  .graph-page .top .meta { display: none; }
  .quiz { padding-top: 28px; }
  .eyebrow { margin-top: 24px; }
  .opt .txt { font-size: 16px; }
  .answer .btn, .done .btn { width: 100%; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition: none !important; }
}