:root {
  --bg: #F1EFEC;
  --ink: #181818;
  --ink-2: #5b5955;
  --ink-3: #8e8b86;
  --surface: #faf9f7;
  --line: #dcd8d2;
  --line-strong: #c4bfb7;
  --accent: #71C29A;
  --accent-ink: #1f6b47;
  --accent-wash: #e1f1e8;
  --blue: #5E9DBA;
  --blue-wash: #e2eef4;
  --pass: #0CBC69;
  --fail: #FE563C;
  --fail-ink: #b3321c;
  --fail-wash: #fde4df;
  --amber: #FFB005;
  --shadow: 0 1px 2px rgb(24 24 24 / 0.04), 0 8px 24px rgb(24 24 24 / 0.06);
  --radius-card: 20px;
  --radius-ctl: 8px;
  --sans: "Inter", system-ui, sans-serif;
  --mono: "Geist Mono", ui-monospace, monospace;
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #181818;
    --ink: #F1EFEC;
    --ink-2: #b9b5ae;
    --ink-3: #85817b;
    --surface: #212120;
    --line: #333230;
    --line-strong: #4a4845;
    --accent-ink: #8fd6b2;
    --accent-wash: #1f3329;
    --blue-wash: #1f2c33;
    --fail-ink: #ff8b78;
    --fail-wash: #3a221d;
    --shadow: 0 1px 2px rgb(0 0 0 / 0.3), 0 8px 24px rgb(0 0 0 / 0.3);
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--ink);
  font: 400 16px/1.5 var(--sans);
  -webkit-font-smoothing: antialiased;
  background-image: radial-gradient(circle at 1px 1px, color-mix(in srgb, var(--ink) 7%, transparent) 1px, transparent 0);
  background-size: 24px 24px;
}
[hidden] { display: none !important; }
button { font: inherit; color: inherit; }
.mono, .pill, .field-label, .hint, .keys { font-family: var(--mono); }

/* Brand */
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--ink); text-decoration: none; }
.mark {
  width: 30px; height: 18px; background: currentColor;
  -webkit-mask: url(/mark.svg) no-repeat center / contain; mask: url(/mark.svg) no-repeat center / contain;
}
.wordmark { font-weight: 600; font-size: 20px; letter-spacing: -0.03em; }
.brand-lg { display: flex; }
.brand-lg .mark { width: 44px; height: 26px; }
.brand-lg .wordmark { font-size: 28px; }

.pill {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 12px; line-height: 1; letter-spacing: 0.01em;
  padding: 6px 10px; border-radius: 999px;
  border: 1px solid var(--line-strong); color: var(--ink-2); background: var(--surface);
  margin: 0; white-space: nowrap;
}
.pill-ghost { background: transparent; border-style: dashed; }
.pill-area.business { color: var(--accent-ink); border-color: color-mix(in srgb, var(--accent) 60%, transparent); background: var(--accent-wash); }
.pill-area.product { color: var(--blue); border-color: color-mix(in srgb, var(--blue) 60%, transparent); background: var(--blue-wash); }
.pill-name { color: var(--ink); }

/* Layout */
.topbar {
  position: sticky; top: 0; z-index: 10;
  display: flex; justify-content: space-between; align-items: center; gap: 12px;
  padding: 14px clamp(16px, 4vw, 40px);
  background: color-mix(in srgb, var(--bg) 85%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.topbar .pill { display: none; }
@media (min-width: 640px) { .topbar .pill { display: inline-flex; } }
.topnav { display: flex; align-items: center; gap: 4px; }
.link {
  background: none; border: 0; padding: 8px 10px; border-radius: var(--radius-ctl);
  color: var(--ink-2); cursor: pointer; font-size: 14px;
}
.link:hover { color: var(--ink); background: color-mix(in srgb, var(--ink) 6%, transparent); }
.link:focus-visible, .btn:focus-visible, .option:focus-visible, .chip:focus-visible, summary:focus-visible, .board-row:focus-visible {
  outline: 2px solid var(--accent); outline-offset: 2px;
}

main { padding: clamp(24px, 6vw, 72px) clamp(16px, 4vw, 40px) 64px; max-width: 1120px; margin: 0 auto; }
.screen { animation: rise 0.6s var(--ease) both; }
.narrow { max-width: 620px; }
.screen > .pill { margin-bottom: 20px; }

.display {
  font-weight: 600; line-height: 0.95; letter-spacing: -0.03em;
  font-feature-settings: "calt" 1, "ss03" 1, "cv01" 1;
  font-size: clamp(40px, 7vw, 76px); margin: 16px 0 20px; text-wrap: balance;
}
.lede { color: var(--ink-2); font-size: 18px; max-width: 54ch; margin: 0 0 32px; }

/* Gate */
.gate { display: grid; gap: 56px; align-items: center; min-height: calc(100vh - 160px); }
@media (min-width: 920px) { .gate { grid-template-columns: 1.1fr 0.9fr; } }
.gate-copy .pill { margin-top: 36px; }
.gate-form { display: flex; flex-wrap: wrap; gap: 12px; align-items: end; max-width: 520px; }
.field { display: grid; gap: 8px; flex: 1 1 240px; }
.field-label { font-size: 12px; color: var(--ink-3); text-transform: uppercase; letter-spacing: 0.06em; }
input {
  font: 500 17px var(--sans); color: var(--ink);
  padding: 13px 14px; border-radius: var(--radius-ctl);
  border: 1px solid var(--line-strong); background: var(--surface);
  transition: border-color 0.2s, box-shadow 0.2s;
}
input:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 4px color-mix(in srgb, var(--accent) 25%, transparent); }
.form-error { flex-basis: 100%; margin: 0; min-height: 1.5em; color: var(--fail-ink); font-size: 14px; }
.hint { flex-basis: 100%; margin: 0; color: var(--ink-3); font-size: 13px; min-height: 1.2em; }
.shake { animation: shake 0.4s; }

.btn {
  display: inline-flex; align-items: center; gap: 8px; justify-content: center;
  padding: 13px 20px; border-radius: var(--radius-ctl); cursor: pointer;
  border: 1px solid var(--line-strong); background: var(--surface); font-weight: 500;
  transition: transform 0.15s var(--ease), background 0.2s, border-color 0.2s;
}
.btn:hover { border-color: var(--ink-3); }
.btn:active { transform: scale(0.97); }
.btn-primary { background: var(--ink); color: var(--bg); border-color: var(--ink); }
.btn-primary:hover { background: color-mix(in srgb, var(--ink) 85%, var(--accent)); }
.btn[disabled] { opacity: 0.5; pointer-events: none; }

.stack { margin: 0; display: grid; gap: 8px; perspective: 900px; }
.stack-layer {
  display: flex; align-items: center; gap: 14px;
  padding: 16px 18px; border-radius: 12px;
  border: 1px solid var(--line); background: var(--surface); box-shadow: var(--shadow);
  font-weight: 500; transform: rotateX(18deg);
  animation: layer-in 0.8s var(--ease) both; animation-delay: calc(var(--i) * 80ms + 150ms);
}
.stack-layer .mono { font-size: 12px; color: var(--ink-3); width: 22px; }
.stack-layer em { margin-left: auto; font-style: normal; font-family: var(--mono); font-size: 11px; color: var(--accent-ink); }
.stack-evals {
  background: var(--ink); color: var(--bg); border-color: var(--ink);
  transform: rotateX(18deg) translateX(-14px) scale(1.03);
}
.stack-evals .mono { color: var(--accent); }
.stack-evals em { color: var(--accent); }
.stack-evals::after {
  content: ""; width: 8px; height: 8px; border-radius: 50%; background: var(--accent);
  margin-left: 8px; animation: pulse 1.6s infinite;
}
.stack figcaption { margin-top: 10px; font-size: 12px; color: var(--ink-3); }

.chips { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 20px; }
.chip {
  padding: 8px 14px; border-radius: 999px; border: 1px solid var(--line-strong);
  background: var(--surface); cursor: pointer; font-weight: 500; font-size: 15px;
  transition: transform 0.15s var(--ease), border-color 0.2s;
}
.chip:hover { border-color: var(--accent); }
.chip:active { transform: scale(0.96); }
.chip small { font-family: var(--mono); color: var(--ink-3); margin-left: 6px; font-size: 11px; }

/* Quiz */
.quiz { max-width: 780px; margin: 0 auto; }
.run-strip { display: flex; align-items: center; gap: 16px; margin-bottom: 20px; }
.cells { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(var(--n, 30), 1fr); gap: 4px; flex: 1; }
.cells li {
  height: 22px; border-radius: 4px; border: 1px solid var(--line-strong); background: var(--surface);
  transition: background 0.4s var(--ease), border-color 0.4s, transform 0.4s var(--ease);
}
.cells li.current { border-color: var(--ink); box-shadow: inset 0 0 0 1px var(--ink); }
.cells li.pass { background: var(--pass); border-color: var(--pass); transform: scaleY(1.1); }
.cells li.fail { background: var(--fail); border-color: var(--fail); }
.tally { font-size: 13px; color: var(--ink-2); white-space: nowrap; min-width: 92px; text-align: right; }

.card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius-card); box-shadow: var(--shadow); }
.task { padding: clamp(22px, 4vw, 40px); }
.task.enter { animation: task-in 0.5s var(--ease) both; }
.task-meta { display: flex; flex-wrap: wrap; gap: 8px; }
.prompt {
  font-weight: 600; letter-spacing: -0.02em; line-height: 1.15;
  font-size: clamp(22px, 3.2vw, 30px); margin: 22px 0 26px; text-wrap: balance;
}
.options { display: grid; gap: 10px; }
.option {
  display: grid; grid-template-columns: 30px 1fr 22px; gap: 14px; align-items: center;
  text-align: left; padding: 14px 16px; border-radius: 12px; cursor: pointer;
  border: 1px solid var(--line-strong); background: var(--bg);
  transition: border-color 0.2s, background 0.25s, transform 0.15s var(--ease), opacity 0.3s;
  animation: rise 0.45s var(--ease) both; animation-delay: calc(var(--i) * 50ms + 80ms);
}
.option:hover:not([disabled]) { border-color: var(--ink); transform: translateX(3px); }
.option:active:not([disabled]) { transform: scale(0.99); }
.option[disabled] { cursor: default; }
.key {
  font-family: var(--mono); font-size: 12px; width: 26px; height: 26px; border-radius: 6px;
  display: grid; place-items: center; border: 1px solid var(--line-strong); color: var(--ink-2);
}
.mark-icon { font-family: var(--mono); font-weight: 600; text-align: center; }
.option.correct { border-color: var(--pass); background: var(--accent-wash); }
.option.correct .key { background: var(--pass); border-color: var(--pass); color: #fff; }
.option.correct .mark-icon { color: var(--pass); }
.option.wrong { border-color: var(--fail); background: var(--fail-wash); animation: shake 0.4s; }
.option.wrong .key { background: var(--fail); border-color: var(--fail); color: #fff; }
.option.wrong .mark-icon { color: var(--fail); }
.option.dim { opacity: 0.45; }

.verdict {
  margin-top: 22px; padding: 18px 20px; border-radius: 14px;
  border: 1px dashed var(--line-strong); animation: rise 0.4s var(--ease) both;
  display: grid; gap: 6px;
}
.verdict-head { margin: 0; font-family: var(--mono); font-size: 13px; }
.verdict-head.pass { color: var(--accent-ink); }
.verdict-head.fail { color: var(--fail-ink); }
.verdict-why { margin: 0 0 10px; color: var(--ink-2); }
.verdict .btn { justify-self: start; }
.keys { text-align: center; color: var(--ink-3); font-size: 12px; margin-top: 18px; }
@media (hover: none) { .keys { display: none; } }

/* Results */
.results { display: grid; gap: 20px; max-width: 880px; margin: 0 auto; }
.readout { padding: clamp(24px, 5vw, 48px); position: relative; overflow: hidden; }
.readout::before {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background: linear-gradient(180deg, transparent 0%, color-mix(in srgb, var(--accent) 18%, transparent) 50%, transparent 100%);
  height: 40%; animation: scan 1.6s var(--ease) 0.2s both;
}
.score { display: flex; align-items: baseline; gap: 6px; margin: 18px 0 6px; }
.score-num {
  font-weight: 600; letter-spacing: -0.05em; line-height: 0.9;
  font-size: clamp(96px, 18vw, 168px); font-variant-numeric: tabular-nums;
}
.score-den { font-family: var(--mono); font-size: clamp(24px, 4vw, 36px); color: var(--ink-3); }
.verdict-line { font-size: 20px; font-weight: 500; margin: 0 0 28px; max-width: 40ch; }
.areas { display: grid; gap: 14px; margin-bottom: 32px; }
.area-row { display: grid; grid-template-columns: 130px 1fr 52px; gap: 14px; align-items: center; font-size: 14px; }
.area-row .mono { text-align: right; color: var(--ink-2); }
.bar { height: 10px; border-radius: 999px; background: var(--line); overflow: hidden; }
.bar > span { display: block; height: 100%; border-radius: inherit; width: 0; transition: width 1.1s var(--ease) 0.3s; }
.bar.business > span { background: var(--accent); }
.bar.product > span { background: var(--blue); }
.actions { display: flex; flex-wrap: wrap; gap: 10px; }

.review { padding: 4px 22px; }
.review summary { cursor: pointer; padding: 16px 0; font-weight: 500; }
.review ol { margin: 0 0 18px; padding-left: 20px; display: grid; gap: 14px; }
.review li { padding-left: 6px; }
.review .q { font-weight: 500; }
.review .a { display: block; font-size: 14px; color: var(--ink-2); margin-top: 4px; }
.review .a b { font-weight: 500; color: var(--accent-ink); }
.review .a s { color: var(--fail-ink); }

.section-title { font-size: 20px; letter-spacing: -0.02em; margin: 0 0 14px; display: flex; flex-wrap: wrap; align-items: center; gap: 10px; }
.board-card { padding: clamp(18px, 3vw, 28px); margin-bottom: 24px; }
.board { list-style: none; margin: 0; padding: 0; }
.board-empty { color: var(--ink-3); font-family: var(--mono); font-size: 13px; padding: 12px 0; }
.board-item { border-top: 1px solid var(--line); }
.board-item:first-child { border-top: 0; }
.board-row {
  width: 100%; display: grid; grid-template-columns: 34px 1fr 96px 92px 24px; gap: 14px; align-items: center;
  padding: 14px 6px; background: none; border: 0; cursor: pointer; text-align: left; border-radius: 10px;
  animation: rise 0.5s var(--ease) both; animation-delay: calc(var(--i) * 60ms);
}
.board-row:hover { background: color-mix(in srgb, var(--ink) 4%, transparent); }
.rank { font-family: var(--mono); font-size: 13px; color: var(--ink-3); }
.board-item:first-child .rank { color: var(--ink); }
.person { display: grid; gap: 6px; min-width: 0; }
.person-name { font-weight: 600; letter-spacing: -0.01em; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.person-name .you { font-family: var(--mono); font-size: 11px; color: var(--accent-ink); margin-left: 6px; font-weight: 400; }
.person .bar { height: 6px; }
.person .bar > span { background: var(--ink); }
.board-item:first-child .person .bar > span { background: var(--accent); }
.best { font-family: var(--mono); font-size: 14px; text-align: right; }
.best small { display: block; color: var(--ink-3); font-size: 11px; }
.spark { width: 92px; height: 32px; overflow: visible; }
.spark polyline { fill: none; stroke: var(--ink-3); stroke-width: 1.5; stroke-linejoin: round; stroke-linecap: round; }
.spark circle { fill: var(--accent); }
.chev { color: var(--ink-3); transition: transform 0.3s var(--ease); font-family: var(--mono); }
.board-item.open .chev { transform: rotate(90deg); }
.history { display: none; padding: 0 6px 16px 54px; }
.board-item.open .history { display: block; animation: rise 0.35s var(--ease) both; }
.history table { width: 100%; border-collapse: collapse; font-size: 13px; }
.history th { text-align: left; font-family: var(--mono); font-weight: 400; color: var(--ink-3); font-size: 11px; text-transform: uppercase; letter-spacing: 0.05em; padding: 6px 8px 6px 0; }
.history td { padding: 7px 8px 7px 0; border-top: 1px dashed var(--line); font-variant-numeric: tabular-nums; }
.history td.mono { font-size: 12px; }
@media (max-width: 560px) {
  .board-row { grid-template-columns: 28px 1fr 74px 20px; }
  .spark { display: none; }
  .history { padding-left: 6px; }
  .area-row { grid-template-columns: 90px 1fr 44px; }
  .cells { gap: 2px; }
  .cells li { height: 18px; }
  .tally { min-width: 0; }
}

@keyframes rise { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: none; } }
@keyframes task-in { from { opacity: 0; transform: translateX(24px); } to { opacity: 1; transform: none; } }
@keyframes layer-in { from { opacity: 0; transform: rotateX(60deg) translateY(-20px); } }
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.25; } }
@keyframes shake { 0%, 100% { transform: none; } 25% { transform: translateX(-5px); } 75% { transform: translateX(5px); } }
@keyframes scan { from { transform: translateY(-100%); } to { transform: translateY(260%); } }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; animation-delay: 0ms !important; transition-duration: 0.01ms !important; }
}