/* Lifeguard Trainer — minimalist typographic.
   Pure black-on-white, no cards/shadows/emoji. Hierarchy from type, weight, spacing. */

:root {
  --ink: #111;
  --soft: #555;
  --rule: #e5e5e5;
  --rule-strong: #c4c4c4;
  --bg: #fff;
  --good: #1f7a3a;
  --bad: #b21f2d;
  --accent: #1a1a1a;
  --max: 640px;
}

@media (prefers-color-scheme: dark) {
  /* Keep the same minimalist look in dark mode by inverting. */
  :root {
    --ink: #f4f4f4;
    --soft: #a8a8a8;
    --rule: #2a2a2a;
    --rule-strong: #444;
    --bg: #0c0c0c;
    --good: #4cc171;
    --bad: #ef6970;
  }
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; }
body {
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Inter", "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  font-size: 17px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  font-feature-settings: "ss01", "ss02", "cv11";
}

#app {
  max-width: var(--max);
  margin: 0 auto;
  padding: 48px 24px max(env(safe-area-inset-bottom), 48px);
}
@media (max-width: 480px) { #app { padding: 32px 18px max(env(safe-area-inset-bottom), 36px); } }

.screen { display: none; }
.screen.active { display: block; }

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  padding: 0;
  cursor: pointer;
  text-align: left;
}

/* ── Masthead ─────────────────────── */
.masthead h1 {
  font-size: clamp(34px, 7vw, 44px);
  font-weight: 700;
  letter-spacing: -0.025em;
  line-height: 1.05;
  margin: 0 0 12px;
}
.masthead .lede {
  font-size: 17px;
  color: var(--soft);
  margin: 0 0 40px;
  max-width: 38ch;
}

/* ── Path links (Test prep / Refresher) ─────────────────────── */
.paths {
  display: grid;
  gap: 0;
  margin: 32px 0 48px;
  border-top: 1px solid var(--rule);
}
.path {
  display: grid;
  grid-template-columns: 1fr auto;
  grid-template-rows: auto auto;
  gap: 4px 18px;
  padding: 22px 0;
  border-bottom: 1px solid var(--rule);
  width: 100%;
  transition: padding-left 160ms ease;
}
.path:hover { padding-left: 6px; }
.path:focus-visible { outline: 2px solid var(--ink); outline-offset: 4px; }
.path-name {
  grid-column: 1; grid-row: 1;
  font-size: 22px;
  font-weight: 600;
  letter-spacing: -0.01em;
}
.path-meta {
  grid-column: 2; grid-row: 1;
  align-self: end;
  font-size: 12px;
  color: var(--soft);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  font-variant-numeric: tabular-nums;
}
.path-desc {
  grid-column: 1 / -1; grid-row: 2;
  color: var(--soft);
  font-size: 15px;
}

/* ── Filter chips (Source) ─────────────────────── */
.filters { margin: 32px 0; }
.filters h2 {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--soft);
  margin: 0 0 8px;
}
.filters-help {
  font-size: 14px;
  color: var(--soft);
  margin: 0 0 14px;
  max-width: 48ch;
}
.chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.chip {
  appearance: none;
  border: 1px solid var(--rule-strong);
  border-radius: 999px;
  padding: 6px 14px;
  font-size: 13px;
  color: var(--ink);
  background: transparent;
  cursor: pointer;
  font-variant-numeric: tabular-nums;
  transition: background 120ms ease, color 120ms ease, border-color 120ms ease;
}
.chip:hover { border-color: var(--ink); }
.chip[aria-pressed="true"] {
  background: var(--ink);
  color: var(--bg);
  border-color: var(--ink);
}
.chip-count { opacity: 0.6; margin-left: 6px; font-size: 11px; }

/* ── Category list ─────────────────────── */
.categories { margin: 40px 0 32px; }
.categories h2 {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--soft);
  margin: 0 0 12px;
}
.cat-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--rule);
}
.cat-list li { border-bottom: 1px solid var(--rule); }
.cat-link {
  display: flex;
  width: 100%;
  align-items: baseline;
  justify-content: space-between;
  padding: 14px 0;
  transition: padding-left 140ms ease;
}
.cat-link:hover { padding-left: 6px; }
.cat-name { font-size: 16px; }
.cat-count {
  font-size: 12px;
  color: var(--soft);
  letter-spacing: 0.05em;
  font-variant-numeric: tabular-nums;
}

/* ── Last result hint + install ─────────────────────── */
.last-result { color: var(--soft); font-size: 13px; margin: 24px 0 0; }
.install {
  display: inline-block;
  margin-top: 24px;
  padding: 10px 16px;
  border: 1px solid var(--ink);
  font-size: 14px;
  cursor: pointer;
  background: transparent;
  color: var(--ink);
  border-radius: 4px;
}
.install:hover { background: var(--ink); color: var(--bg); }

/* ── Footer ─────────────────────── */
.colophon {
  margin: 64px 0 0;
  padding-top: 24px;
  border-top: 1px solid var(--rule);
  color: var(--soft);
  font-size: 13px;
  line-height: 1.55;
}
.colophon p { margin: 0 0 12px; }
.refs { font-size: 12px; line-height: 1.7; }
.refs span { display: inline-block; margin-right: 14px; }

/* ── Quiz screen ─────────────────────── */
.quiz-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--rule);
}
.back {
  width: 36px; height: 36px;
  display: inline-flex; align-items: center; justify-content: center;
  border: 1px solid var(--rule-strong);
  border-radius: 999px;
  font-size: 18px;
  color: var(--ink);
}
.back:hover { border-color: var(--ink); }
.progress-track {
  flex: 1;
  height: 2px;
  background: var(--rule);
  position: relative;
}
.progress-fill {
  position: absolute; top: 0; left: 0;
  height: 100%;
  background: var(--ink);
  transition: width 220ms ease;
  width: 0%;
}
.counter {
  font-size: 12px;
  color: var(--soft);
  letter-spacing: 0.06em;
  font-variant-numeric: tabular-nums;
  min-width: 56px;
  text-align: right;
}

.quiz-body { padding: 24px 0 32px; }
.meta-row { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 18px; }
.meta-tag {
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--soft);
  border: 1px solid var(--rule);
  padding: 3px 9px;
  border-radius: 999px;
}
.question {
  font-size: clamp(20px, 4.4vw, 24px);
  font-weight: 600;
  line-height: 1.35;
  margin: 0 0 24px;
  letter-spacing: -0.01em;
}
.options {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--rule);
}
.options li { border-bottom: 1px solid var(--rule); }
.option {
  display: flex;
  width: 100%;
  align-items: flex-start;
  gap: 14px;
  padding: 14px 4px;
  font-size: 16px;
  line-height: 1.5;
  transition: padding-left 140ms ease;
}
.option:hover:not(:disabled) { padding-left: 10px; }
.option .letter {
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  color: var(--soft);
  width: 18px;
  flex-shrink: 0;
}
.option.correct { color: var(--good); }
.option.correct .letter { color: var(--good); }
.option.incorrect { color: var(--bad); }
.option.incorrect .letter { color: var(--bad); }
.option:disabled { cursor: default; }

.feedback {
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px solid var(--rule);
}
.verdict { font-weight: 700; margin: 0 0 8px; font-size: 15px; }
.verdict.good { color: var(--good); }
.verdict.bad { color: var(--bad); }
.explain { color: var(--soft); margin: 0 0 18px; font-size: 15px; line-height: 1.55; }

/* ── Buttons ─────────────────────── */
.primary, .secondary {
  font-size: 15px;
  padding: 11px 18px;
  border-radius: 4px;
  cursor: pointer;
  font-weight: 600;
}
.primary { background: var(--ink); color: var(--bg); border: 1px solid var(--ink); }
.primary:hover { opacity: 0.85; }
.secondary { background: transparent; color: var(--ink); border: 1px solid var(--rule-strong); }
.secondary:hover { border-color: var(--ink); }

/* ── Results ─────────────────────── */
.results-head { padding: 24px 0; }
.score {
  font-size: clamp(56px, 12vw, 84px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  margin: 0 0 8px;
  font-variant-numeric: tabular-nums;
}
.score-sub { color: var(--soft); margin: 0; font-size: 16px; }
.meter { height: 2px; background: var(--rule); margin: 24px 0 32px; }
.meter-fill { height: 100%; background: var(--ink); width: 0; }
.weak h2 {
  font-size: 13px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--soft);
  margin: 0 0 12px;
  font-weight: 600;
}
.weak-list { list-style: none; margin: 0 0 32px; padding: 0; border-top: 1px solid var(--rule); }
.weak-list li {
  display: grid;
  grid-template-columns: 1fr auto auto;
  gap: 12px;
  padding: 12px 0;
  border-bottom: 1px solid var(--rule);
  align-items: center;
}
.weak-name { font-weight: 500; }
.weak-bar { width: 80px; height: 2px; background: var(--rule); }
.weak-bar-fill { height: 100%; background: var(--ink); }
.weak-pct { font-size: 12px; color: var(--soft); font-variant-numeric: tabular-nums; min-width: 56px; text-align: right; }

.results-actions {
  display: grid;
  gap: 8px;
  margin-top: 24px;
}
@media (min-width: 540px) {
  .results-actions { grid-template-columns: 1fr 1fr 1fr; }
}