/* Direction: "field manual". Paper surface, deep ink, one working accent.
   Serif for headings (reads like a study guide), sans for UI, tabular numbers for scores.
   System font stacks on purpose: the app must work offline with zero network. */
:root {
  --paper: #f6f4ee;
  --paper-2: #ece9e0;
  --card: #fffdf8;
  --ink: #17221c;
  --ink-2: #4a5850;
  --ink-3: #5f6b64; /* 5.1:1 on paper, 4.6:1 on paper-2 (WCAG AA) */
  --rule: #d9d5c9;
  --accent: #1f6b45;
  --accent-ink: #ffffff;
  --accent-soft: #e2efe6;
  --good: #1f6b45;
  --good-soft: #e2efe6;
  --bad: #a3361f;
  --bad-soft: #f6e3dd;
  --warn: #8a5a00;
  --focus: #2457c5;

  --serif: "Iowan Old Style", "Charter", "Palatino Linotype", Georgia, serif;
  --sans: "Segoe UI", system-ui, -apple-system, "Helvetica Neue", Arial, sans-serif;
  --mono: "Cascadia Mono", "SF Mono", Consolas, monospace;

  --r-sm: 6px;
  --r-md: 12px;
  --shadow: 0 1px 0 rgba(23, 34, 28, 0.06), 0 8px 24px -12px rgba(23, 34, 28, 0.18);
  --ease: cubic-bezier(0.2, 0.8, 0.2, 1);
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #0f1512;
    --paper-2: #151d18;
    --card: #18211c;
    --ink: #e9efe9;
    --ink-2: #b4c0b8;
    --ink-3: #85938a;
    --rule: #2a362f;
    --accent: #5fbf8a;
    --accent-ink: #0d1a12;
    --accent-soft: #1d3326;
    --good: #5fbf8a;
    --good-soft: #1d3326;
    --bad: #f08a70;
    --bad-soft: #3a211b;
    --warn: #e0b45a;
    --shadow: 0 1px 0 rgba(0, 0, 0, 0.3), 0 10px 30px -14px rgba(0, 0, 0, 0.6);
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 16px/1.55 var(--sans);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
main { flex: 1; width: 100%; max-width: 760px; margin: 0 auto; padding: 8px 16px 48px; outline: none; }

.topbar {
  display: flex; align-items: center; justify-content: space-between;
  max-width: 760px; width: 100%; margin: 0 auto; padding: 18px 16px 10px;
}
.brand {
  display: inline-flex; align-items: center; gap: 10px; background: none; border: 0; padding: 4px 0;
  font: 600 15px/1 var(--sans); color: var(--ink); cursor: pointer; letter-spacing: 0.01em;
}
.brand-mark {
  width: 22px; height: 22px; border-radius: 5px; background: var(--accent);
  box-shadow: inset 0 0 0 4px var(--paper), inset 0 0 0 6px var(--accent);
}
.edition {
  font: 600 11px/1 var(--sans); text-transform: uppercase; letter-spacing: 0.12em; color: var(--ink-3);
  border: 1px solid var(--rule); padding: 6px 8px; border-radius: 999px;
}

h1, h2, h3 { font-family: var(--serif); font-weight: 600; letter-spacing: -0.01em; margin: 0; }
h1 { font-size: clamp(30px, 5vw, 40px); line-height: 1.1; }
h2 { font-size: 22px; line-height: 1.25; }
h3 { font-size: 17px; }
p { margin: 0; }
.lede { color: var(--ink-2); margin-top: 10px; max-width: 56ch; }
.eyebrow { font: 600 12px/1 var(--sans); text-transform: uppercase; letter-spacing: 0.14em; color: var(--accent); }
.muted { color: var(--ink-3); }
.num { font-variant-numeric: tabular-nums; }

.hero { padding: 26px 0 22px; border-bottom: 1px solid var(--rule); }
.hero .eyebrow { margin-bottom: 12px; display: block; }

/* Readiness: the one chart on the dashboard. Bars sit on a hairline with the pass mark drawn in. */
.readiness { margin: 26px 0 8px; }
.readiness-head { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; margin-bottom: 14px; }
.domain-row { display: grid; grid-template-columns: minmax(0, 1fr) 64px; gap: 6px 14px; align-items: center; padding: 9px 0; border-top: 1px solid var(--rule); }
.domain-row:first-of-type { border-top: 0; }
.domain-name { font-size: 14.5px; }
.domain-weight { color: var(--ink-3); font-size: 12.5px; margin-left: 6px; }
.domain-pct { text-align: right; font: 600 14px/1 var(--sans); }
.bar { grid-column: 1 / -1; position: relative; height: 6px; background: var(--paper-2); border-radius: 3px; overflow: visible; }
.bar-fill { position: absolute; inset: 0 auto 0 0; border-radius: 3px; background: var(--accent); transform-origin: left; transition: transform 500ms var(--ease); }
.bar-fill.is-low { background: var(--bad); }
.bar-pass { position: absolute; top: -4px; bottom: -4px; width: 2px; background: var(--ink); opacity: 0.55; }
.bar-empty { color: var(--ink-3); font-size: 12.5px; }

.actions { display: grid; gap: 10px; margin-top: 26px; }
.action {
  display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 4px 16px; text-align: left;
  background: var(--card); color: var(--ink); border: 1px solid var(--rule); border-radius: var(--r-md);
  padding: 16px 18px; cursor: pointer; box-shadow: var(--shadow);
  transition: transform 160ms var(--ease), border-color 160ms var(--ease);
}
.action:hover { border-color: var(--accent); transform: translateY(-1px); }
.action:active { transform: translateY(0); }
.action-title { font: 600 16px/1.3 var(--sans); }
.action-sub { grid-column: 1; color: var(--ink-2); font-size: 14px; }
.action-meta { grid-row: 1 / span 2; grid-column: 2; font: 600 13px/1 var(--sans); color: var(--ink-3); }
.action.primary { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
.action.primary .action-sub, .action.primary .action-meta { color: inherit; opacity: 0.85; }
.action[disabled] { opacity: 0.5; cursor: not-allowed; transform: none; }

.domain-pick { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px; }
.chip {
  border: 1px solid var(--rule); background: var(--card); color: var(--ink); border-radius: 999px;
  padding: 8px 12px; font: 500 14px/1 var(--sans); cursor: pointer;
}
.chip:hover { border-color: var(--accent); }

.unlock {
  margin-top: 28px; padding: 18px; border: 1px dashed var(--accent); border-radius: var(--r-md);
  background: var(--accent-soft); display: grid; gap: 10px;
}
.unlock a { justify-self: start; }

/* Question screen */
.q-head { display: flex; justify-content: space-between; align-items: center; gap: 12px; padding: 18px 0 10px; }
.progress { flex: 1; height: 4px; background: var(--paper-2); border-radius: 2px; overflow: hidden; }
.progress > span { display: block; height: 100%; background: var(--accent); transform-origin: left; transition: transform 300ms var(--ease); }
.timer { font: 600 14px/1 var(--mono); color: var(--ink-2); min-width: 56px; text-align: right; }
.timer.is-low { color: var(--bad); }
.q-domain { margin-top: 18px; }
.stem { font-family: var(--serif); font-size: 21px; line-height: 1.4; margin: 10px 0 20px; }
.choices { display: grid; gap: 10px; list-style: none; padding: 0; margin: 0; }
.choice {
  width: 100%; display: grid; grid-template-columns: 30px 1fr; gap: 12px; align-items: start; text-align: left;
  background: var(--card); color: var(--ink); border: 1.5px solid var(--rule); border-radius: var(--r-md);
  padding: 14px 16px; font: 16px/1.45 var(--sans); cursor: pointer;
  transition: border-color 140ms var(--ease), background-color 140ms var(--ease);
}
.choice:hover:not([disabled]) { border-color: var(--ink-3); }
.choice[aria-pressed="true"] { border-color: var(--accent); background: var(--accent-soft); }
.choice.is-correct { border-color: var(--good); background: var(--good-soft); }
.choice.is-wrong { border-color: var(--bad); background: var(--bad-soft); }
.choice[disabled] { cursor: default; }
.key {
  width: 26px; height: 26px; border-radius: 6px; border: 1px solid var(--rule); display: grid; place-items: center;
  font: 600 13px/1 var(--mono); color: var(--ink-2); background: var(--paper);
}

.feedback { margin-top: 18px; padding: 16px 18px; border-radius: var(--r-md); background: var(--card); border: 1px solid var(--rule); border-left: 4px solid var(--good); }
.feedback.is-wrong { border-left-color: var(--bad); }
.feedback h3 { margin-bottom: 6px; }
.feedback p + p { margin-top: 8px; }
.cite { font-size: 13.5px; color: var(--ink-2); }
.cite a { color: inherit; }

.bar-actions { display: flex; gap: 10px; justify-content: space-between; align-items: center; margin-top: 22px; flex-wrap: wrap; }
.btn {
  appearance: none; border: 1px solid var(--accent); background: var(--accent); color: var(--accent-ink);
  border-radius: var(--r-sm); padding: 12px 18px; font: 600 15px/1 var(--sans); cursor: pointer; text-decoration: none;
  display: inline-flex; align-items: center; gap: 8px;
}
.btn:hover { filter: brightness(1.06); }
.btn[disabled] { opacity: 0.45; cursor: not-allowed; filter: none; }
.btn.ghost { background: transparent; color: var(--ink); border-color: var(--rule); }
.btn.ghost:hover { border-color: var(--ink-3); }
.btn.small { padding: 4px 12px; font-size: 13px; min-height: 32px; }
.useful { margin-top: 10px; font-size: 13.5px; color: var(--ink-2); display: flex; align-items: center; gap: 6px; flex-wrap: wrap; }
.hint { font-size: 13px; color: var(--ink-3); }

/* Results */
.score { display: flex; align-items: baseline; gap: 14px; margin: 18px 0 4px; flex-wrap: wrap; }
.score-big { font: 600 64px/1 var(--serif); font-variant-numeric: tabular-nums; }
.verdict { font: 700 13px/1 var(--sans); letter-spacing: 0.12em; text-transform: uppercase; padding: 7px 10px; border-radius: 999px; }
.verdict.pass { background: var(--good-soft); color: var(--good); }
.verdict.fail { background: var(--bad-soft); color: var(--bad); }
.missed { margin-top: 28px; display: grid; gap: 12px; }
.missed details { background: var(--card); border: 1px solid var(--rule); border-radius: var(--r-md); padding: 12px 16px; }
.missed summary { cursor: pointer; font-weight: 600; }
.missed .ans { margin-top: 8px; }

:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; }
main:focus-visible { outline: none; }
.quote { margin: 10px 0 0; padding: 8px 12px; border-left: 2px solid var(--rule); color: var(--ink-2, inherit); font-size: 14px; font-style: italic; } /* focused programmatically on each screen change */
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

.foot { max-width: 760px; width: 100%; margin: 0 auto; padding: 18px 16px 28px; color: var(--ink-3); font-size: 12.5px; border-top: 1px solid var(--rule); }

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; }
}
@media (max-width: 480px) {
  .stem { font-size: 19px; }
  .score-big { font-size: 52px; }
  .hint { display: none; }
}

.static-choices { list-style: none; padding: 0; display: grid; gap: 8px; margin: 18px 0; }
.static-choices li { background: var(--card); border: 1px solid var(--rule); border-radius: var(--r-md); padding: 12px 14px; display: flex; gap: 12px; align-items: baseline; }
.static-choices .key { flex: none; display: inline-grid; place-items: center; width: 24px; height: 24px; margin: 0; font: 600 12px/1 var(--mono); color: var(--ink-2); }
.reveal summary { cursor: pointer; font-weight: 600; padding: 10px 0; }
.reveal .feedback h2 { font-size: 17px; }
.cta { margin: 22px 0; }
.pager { display: flex; justify-content: space-between; margin: 28px 0 8px; }
.plain { padding-left: 20px; line-height: 1.6; }
.plain li { margin: 6px 0; }
a.brand { text-decoration: none; color: inherit; display: inline-flex; align-items: center; gap: 10px; }