:root {
  --bg: #f6f1ea;
  --card: #fffdf9;
  --ink: #2b2622;
  --muted: #7a6f65;
  --line: #e6dccf;
  --accent: #7b3f4d;
  --accent-ink: #fff;
  --accent-soft: #f3e3e6;
  --good: #2f7d5b;
  --good-soft: #e1f2e9;
  --bad: #b3413a;
  --bad-soft: #f8e2df;
  --shadow: 0 1px 2px rgba(60, 40, 20, .06), 0 12px 40px rgba(60, 40, 20, .08);
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", Georgia, serif;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #17130f;
    --card: #211b16;
    --ink: #f1e9df;
    --muted: #a3968a;
    --line: #3a3027;
    --accent: #d78a9c;
    --accent-ink: #26121a;
    --accent-soft: #3a2229;
    --good: #6fcf9f;
    --good-soft: #17322a;
    --bad: #f0857c;
    --bad-soft: #3a1f1c;
    --shadow: 0 12px 40px rgba(0, 0, 0, .4);
  }
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: clamp(16px, 5vw, 56px) 16px 24px;
  background:
    radial-gradient(1200px 500px at 50% -10%, var(--accent-soft), transparent 70%),
    var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  line-height: 1.55;
}

.card {
  width: 100%;
  max-width: 680px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 20px;
  box-shadow: var(--shadow);
  padding: clamp(24px, 5vw, 44px);
}

.screen[hidden] { display: none; }

.eyebrow {
  margin: 0 0 8px;
  font-size: .78rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 600;
}

h1, h2, h3 { font-family: var(--serif); font-weight: 600; line-height: 1.25; margin: 0; }
h1 { font-size: clamp(1.9rem, 5vw, 2.6rem); }
h2 { font-size: clamp(1.2rem, 3.2vw, 1.5rem); margin: 6px 0 22px; }
h3 { font-size: 1.05rem; margin: 28px 0 10px; }

.lede { color: var(--muted); margin: 12px 0 22px; font-size: 1.02rem; }

.units {
  list-style: none;
  padding: 0;
  margin: 0 0 28px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.units li {
  font-size: .82rem;
  padding: 5px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
}

.sizes { border: 0; padding: 0; margin: 0 0 28px; min-width: 0; }
.sizes legend {
  padding: 0;
  margin-bottom: 10px;
  font-size: .78rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--muted);
  font-weight: 600;
}
.size-options { display: flex; flex-wrap: wrap; gap: 8px; }
.size { position: relative; }
.size input { position: absolute; inset: 0; width: 100%; height: 100%; margin: 0; opacity: 0; cursor: pointer; }
.size span {
  display: block;
  padding: 8px 18px;
  border: 1.5px solid var(--line);
  border-radius: 999px;
  font-size: .9rem;
  transition: background .15s ease, border-color .15s ease, color .15s ease;
}
.size:hover input:not(:checked) + span { border-color: var(--accent); }
.size input:checked + span { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); font-weight: 600; }
.size input:focus-visible + span { outline: 2px solid var(--accent); outline-offset: 2px; }

.btn {
  font: inherit;
  font-weight: 600;
  cursor: pointer;
  padding: 12px 24px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--ink);
  transition: transform .08s ease, background .15s ease, border-color .15s ease;
}
.btn:hover { border-color: var(--accent); }
.btn:active { transform: translateY(1px); }
.btn:focus-visible, .opt:focus-visible, summary:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.btn.primary { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
.btn.primary:hover { filter: brightness(1.08); }
.btn[hidden] { display: none; }

.meta { color: var(--muted); font-size: .85rem; margin: 16px 0 0; }
.hint { text-align: center; margin-top: 22px; }

.quiz-head {
  display: flex;
  justify-content: space-between;
  font-size: .85rem;
  color: var(--muted);
  margin-bottom: 8px;
}

.qnav { display: flex; gap: 8px; margin-top: 14px; }
.navbtn, #q-select {
  box-sizing: border-box;
  height: 40px;
  font: inherit;
  font-size: .9rem;
  color: var(--ink);
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  cursor: pointer;
}
.navbtn { flex: none; width: 44px; font-weight: 600; }
#q-select { flex: 1; min-width: 0; padding: 0 12px; text-overflow: ellipsis; }
.navbtn:hover:not(:disabled), #q-select:hover { border-color: var(--accent); }
.navbtn:disabled { opacity: .4; cursor: default; }
.navbtn:focus-visible, #q-select:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

.bar { height: 6px; border-radius: 6px; background: var(--line); overflow: hidden; }
.bar i { display: block; height: 100%; width: 0; background: var(--accent); border-radius: 6px; transition: width .35s ease; }

.unit-tag {
  margin: 22px 0 0;
  font-size: .75rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--muted);
}

.options { display: grid; gap: 10px; }

.opt {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  width: 100%;
  text-align: left;
  font: inherit;
  color: inherit;
  padding: 14px 16px;
  border-radius: 14px;
  border: 1.5px solid var(--line);
  background: transparent;
  cursor: pointer;
  transition: border-color .15s ease, background .15s ease, transform .08s ease;
}
.opt:hover:not(:disabled) { border-color: var(--accent); background: var(--accent-soft); }
.opt:active:not(:disabled) { transform: translateY(1px); }
.opt .key {
  flex: none;
  width: 26px;
  height: 26px;
  display: grid;
  place-items: center;
  font-size: .8rem;
  font-weight: 600;
  border-radius: 8px;
  border: 1px solid var(--line);
  color: var(--muted);
  margin-top: 1px;
}
.opt:disabled { cursor: default; }
.opt.correct { border-color: var(--good); background: var(--good-soft); }
.opt.correct .key { background: var(--good); border-color: var(--good); color: #fff; }
.opt.wrong { border-color: var(--bad); background: var(--bad-soft); }
.opt.wrong .key { background: var(--bad); border-color: var(--bad); color: #fff; }
.opt.dim { opacity: .55; }

.feedback {
  margin-top: 18px;
  padding: 14px 16px;
  border-radius: 14px;
  background: var(--accent-soft);
  border-left: 4px solid var(--accent);
  animation: rise .25s ease;
}
.feedback.good { background: var(--good-soft); border-left-color: var(--good); }
.feedback.bad { background: var(--bad-soft); border-left-color: var(--bad); }
.feedback[hidden] { display: none; }
.feedback p { margin: 4px 0 0; color: var(--muted); font-size: .95rem; }

.actions { display: flex; gap: 10px; margin-top: 22px; justify-content: flex-end; flex-wrap: wrap; }

.score-ring {
  --p: 0;
  width: 128px;
  height: 128px;
  border-radius: 50%;
  margin: 8px 0 20px;
  display: grid;
  place-items: center;
  background: conic-gradient(var(--accent) calc(var(--p) * 1%), var(--line) 0);
  position: relative;
}
.score-ring::before {
  content: "";
  position: absolute;
  inset: 10px;
  border-radius: 50%;
  background: var(--card);
}
.score-ring span { position: relative; font-family: var(--serif); font-size: 2rem; font-weight: 600; }

.breakdown { list-style: none; padding: 0; margin: 0; display: grid; gap: 10px; }
.breakdown li { display: grid; grid-template-columns: 1fr auto; gap: 4px 12px; font-size: .92rem; }
.breakdown .track { grid-column: 1 / -1; height: 5px; border-radius: 5px; background: var(--line); overflow: hidden; }
.breakdown .track i { display: block; height: 100%; background: var(--accent); }
.breakdown .n { color: var(--muted); font-variant-numeric: tabular-nums; }

details { margin-top: 26px; border-top: 1px solid var(--line); padding-top: 14px; }
summary { cursor: pointer; font-weight: 600; }
.missed { margin-top: 14px; padding: 14px 16px; border: 1px solid var(--line); border-radius: 14px; }
.missed p { margin: 0 0 8px; font-family: var(--serif); font-weight: 600; }
.missed .yours { color: var(--bad); font-size: .92rem; }
.missed .right { color: var(--good); font-size: .92rem; }
.missed .why { color: var(--muted); font-size: .88rem; margin-top: 6px; }

.foot { margin-top: 20px; font-size: .78rem; color: var(--muted); text-align: center; }

@keyframes rise { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
}