/* Тетрадь в клетку: светлая миллиметровка, чернила, жёлтый маркер, зелёно-бирюзовые кнопки */
:root {
  --paper: #EEF2F5;
  --grid: #D9E1E8;
  --ink: #142033;
  --muted: #5A6779;
  --card: #FFFFFF;
  --line: #C9D3DD;
  --act: #0B6E6E;
  --act-ink: #FFFFFF;
  --mark: #FFDD57;
  --ok: #1E7F4E;
  --bad: #B3362C;
  --f-display: "Unbounded", "Arial Black", system-ui, sans-serif;
  --f-body: "Golos Text", "Segoe UI", Roboto, system-ui, sans-serif;
  --f-mono: "JetBrains Mono", ui-monospace, Menlo, Consolas, monospace;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #0F1620; --grid: #18222F; --ink: #E4EAF1; --muted: #93A1B3; --card: #16202C;
    --line: #2A3747; --act: #3CC3B2; --act-ink: #062421; --mark: #B8912A; --ok: #4FC487; --bad: #F07A6F;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --paper: #0F1620; --grid: #18222F; --ink: #E4EAF1; --muted: #93A1B3; --card: #16202C;
  --line: #2A3747; --act: #3CC3B2; --act-ink: #062421; --mark: #B8912A; --ok: #4FC487; --bad: #F07A6F;
  color-scheme: dark;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html, body { margin: 0; }
body {
  background-color: var(--paper);
  background-image:
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 24px 24px;
  color: var(--ink);
  font: 400 17px/1.55 var(--f-body);
  -webkit-font-smoothing: antialiased;
}
.wrap { max-width: 640px; margin: 0 auto; padding-inline: 16px; padding-block: 12px 32px; min-height: 100vh; display: flex; flex-direction: column; }
main { flex: 1; }

.top { display: flex; align-items: center; justify-content: space-between; padding-block: 8px 20px; }
.logo { font: 800 22px/1 var(--f-display); color: var(--ink); text-decoration: none; display: flex; align-items: baseline; gap: 8px; }
.logo span { font: 500 13px/1 var(--f-body); color: var(--muted); }
.timer { font: 700 15px/1 var(--f-mono); padding: 8px 10px; border: 1.5px solid var(--ink); border-radius: 6px; background: var(--card); font-variant-numeric: tabular-nums; }
.timer.low { color: var(--bad); border-color: var(--bad); }

.screen { display: flex; flex-direction: column; gap: 18px; }
.eyebrow { margin: 0; font: 500 12px/1.2 var(--f-mono); letter-spacing: .08em; text-transform: uppercase; color: var(--muted); }
h1 { margin: 0; font: 800 clamp(30px, 8vw, 46px)/1.08 var(--f-display); text-wrap: balance; letter-spacing: -.01em; }
h2 { margin: 0; font: 600 22px/1.3 var(--f-body); text-wrap: balance; }
h3 { margin: 0; font: 700 18px/1.3 var(--f-display); }
mark { background: linear-gradient(transparent 55%, var(--mark) 55%); color: inherit; padding: 0 2px; }
.lead { margin: 0; font-size: 18px; color: var(--ink); max-width: 60ch; }
.note, .small-muted { margin: 0; font-size: 14px; color: var(--muted); }

.facts { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(3, 1fr); border: 1.5px solid var(--ink); border-radius: 8px; background: var(--card); }
.facts li { padding: 14px 12px; display: flex; flex-direction: column; gap: 2px; }
.facts li + li { border-left: 1.5px dashed var(--line); }
.facts b { font: 700 24px/1 var(--f-mono); }
.facts span { font-size: 13px; color: var(--muted); }

.btn { appearance: none; font: 600 17px/1 var(--f-body); border-radius: 8px; padding: 18px 20px; cursor: pointer; border: 1.5px solid var(--ink); color: var(--ink); background: var(--card); text-decoration: none; text-align: center; display: inline-flex; align-items: center; justify-content: center; gap: 6px; transition: transform .08s ease, box-shadow .08s ease; }
.btn.primary { background: var(--act); border-color: var(--act); color: var(--act-ink); box-shadow: 0 4px 0 var(--ink); }
.btn.primary:active { transform: translateY(3px); box-shadow: 0 1px 0 var(--ink); }
.btn.ghost { background: transparent; }
.btn.small { padding: 12px 14px; font-size: 15px; }
.btn:focus-visible, .opt:focus-visible, input:focus-visible, .promo:focus-visible { outline: 3px solid var(--mark); outline-offset: 2px; }

.progress { height: 6px; background: var(--line); border-radius: 3px; overflow: hidden; }
.progress i { display: block; height: 100%; width: 0; background: var(--act); transition: width .25s ease; }
.seq { margin: 0; font: 700 clamp(24px, 7vw, 34px)/1.2 var(--f-mono); letter-spacing: .02em; padding: 18px 16px; background: var(--card); border: 1.5px solid var(--ink); border-radius: 8px; overflow-x: auto; white-space: nowrap; }
.visual { background: var(--card); border: 1.5px solid var(--ink); border-radius: 8px; padding: 16px; display: flex; justify-content: center; }
.matrix { width: 100%; max-width: 300px; height: auto; color: var(--ink); }
.matrix.small { max-width: 200px; }
.strip { width: 100%; max-width: 420px; height: auto; color: var(--ink); }
.matrix .cell { fill: var(--paper); stroke: var(--line); stroke-width: 1.5; }
.q-mark { font: 800 44px var(--f-display); fill: var(--act); }
.num { font: 700 34px var(--f-mono); fill: var(--ink); }

.options { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.options.text-long { grid-template-columns: 1fr; }
.opt { appearance: none; text-align: left; font: 500 17px/1.35 var(--f-body); color: var(--ink); background: var(--card); border: 1.5px solid var(--line); border-radius: 8px; padding: 14px; cursor: pointer; display: flex; gap: 12px; align-items: center; min-width: 0; }
.opt:hover { border-color: var(--ink); }
.opt .k { flex: none; width: 26px; height: 26px; border-radius: 50%; border: 1.5px solid var(--line); font: 700 12px/23px var(--f-mono); text-align: center; color: var(--muted); }
.opt.sel { border-color: var(--act); box-shadow: inset 0 0 0 1.5px var(--act); }
.opt.sel .k { background: var(--act); border-color: var(--act); color: var(--act-ink); }
.opt .fig { width: 64px; height: 64px; color: var(--ink); flex: none; }
.nav { display: flex; justify-content: space-between; gap: 10px; }

.score { display: flex; align-items: flex-start; gap: 10px; }
.iq-label { font: 700 20px/1 var(--f-display); margin-top: 18px; color: var(--muted); }
.iq { font: 800 clamp(96px, 30vw, 150px)/0.95 var(--f-display); letter-spacing: -.04em; font-variant-numeric: tabular-nums; }
.scale { display: flex; flex-direction: column; gap: 6px; }
.scale-track { position: relative; height: 14px; border-radius: 7px; border: 1.5px solid var(--ink); background: linear-gradient(90deg, var(--card), var(--mark)); }
.scale-track i { position: absolute; top: 50%; width: 22px; height: 22px; border-radius: 50%; background: var(--act); border: 3px solid var(--card); transform: translate(-50%, -50%); left: 50%; box-shadow: 0 0 0 1.5px var(--ink); }
.scale-ticks { display: flex; justify-content: space-between; font: 500 12px var(--f-mono); color: var(--muted); }

.share, .paywall, .report { background: var(--card); border: 1.5px solid var(--ink); border-radius: 10px; padding: 18px; display: flex; flex-direction: column; gap: 14px; }
.share img { width: 100%; max-width: 360px; height: auto; border-radius: 8px; border: 1px solid var(--line); align-self: center; }
.share-btns { display: flex; flex-wrap: wrap; gap: 8px; }
.paywall { background: var(--card); box-shadow: 6px 6px 0 var(--mark); }
.ticks { margin: 0; padding: 0; list-style: none; display: flex; flex-direction: column; gap: 8px; }
.ticks li { padding-left: 28px; position: relative; }
.ticks li::before { content: "✓"; position: absolute; left: 0; top: 0; font-weight: 700; color: var(--act); }

.cat { display: grid; grid-template-columns: 1fr auto; gap: 4px 12px; }
.cat + .cat { margin-top: 10px; }
.cat b { font: 700 14px var(--f-mono); font-variant-numeric: tabular-nums; }
.cat .bar { grid-column: 1 / -1; height: 8px; background: var(--line); border-radius: 4px; overflow: hidden; }
.cat .bar i { display: block; height: 100%; background: var(--act); }
.review { margin: 0; padding-left: 24px; display: flex; flex-direction: column; gap: 10px; font-size: 15px; }
.review li.bad::marker { color: var(--bad); font-weight: 700; }
.review li.good::marker { color: var(--ok); font-weight: 700; }
.review .why { color: var(--muted); display: block; }
.review .tag { font: 600 12px var(--f-mono); }
.review li.bad .tag { color: var(--bad); }
.review li.good .tag { color: var(--ok); }
.cert-row { display: flex; flex-direction: column; gap: 8px; }
.cert-row label { font-weight: 600; }
.cert-row input { font: 400 17px var(--f-body); padding: 12px; border-radius: 8px; border: 1.5px solid var(--line); background: var(--paper); color: var(--ink); }
.cert-row img { width: 100%; height: auto; border-radius: 6px; border: 1px solid var(--line); }

.promo { display: flex; flex-direction: column; gap: 4px; padding: 18px; border-radius: 10px; background: var(--ink); color: var(--paper); text-decoration: none; }
.promo-k { font: 500 12px var(--f-mono); text-transform: uppercase; letter-spacing: .08em; color: var(--mark); }
.promo strong { font: 700 20px/1.25 var(--f-display); }
.promo span:last-child { font-size: 15px; opacity: .85; }

.foot { margin-top: 40px; font-size: 13px; color: var(--muted); }
.foot a { color: inherit; }

@media (max-width: 420px) {
  .options { grid-template-columns: 1fr; }
  .options.svg { grid-template-columns: 1fr 1fr; }
}
@media (prefers-reduced-motion: reduce) { * { transition: none !important; } }