:root {
  --red: #c8102e;        /* Dannebrog red */
  --red-dark: #a00d25;
  --ink: #1d1d1f;
  --muted: #6b7280;
  --bg: #faf9f7;
  --card: #ffffff;
  --ok: #15803d;
  --ok-bg: #ecfdf3;
  --ok-border: #bbe7c8;
  --err: #b91c1c;
  --err-bg: #fef2f2;
  --err-border: #f3c1c1;
  --border: #e5e7eb;
  --shadow: 0 6px 18px rgba(0, 0, 0, .06);
}

@media (prefers-color-scheme: dark) {
  :root {
    --ink: #ececee;
    --muted: #9ca3af;
    --bg: #131316;
    --card: #1d1d22;
    --ok: #4ade80;
    --ok-bg: #12271a;
    --ok-border: #1f4d2e;
    --err: #f87171;
    --err-bg: #2a1616;
    --err-border: #5b2424;
    --border: #34343c;
    --shadow: 0 6px 18px rgba(0, 0, 0, .4);
  }
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.55;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.visually-hidden {
  position: absolute; width: 1px; height: 1px;
  clip: rect(0 0 0 0); overflow: hidden;
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
  padding: 0.9rem 1.2rem;
  background: var(--card);
  border-bottom: 1px solid var(--border);
}

.brand { font-weight: 700; font-size: 1.1rem; }
.brand span { color: var(--red); }

.topbar-controls { display: flex; gap: 1rem; align-items: center; flex-wrap: wrap; }
.lang-picker { font-size: 0.85rem; color: var(--muted); display: flex; gap: 0.4rem; align-items: center; }
.lang-picker select, .card-extra select {
  padding: 0.3rem 0.5rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--ink);
  font-size: 0.85rem;
}

.badge {
  background: var(--ok-bg);
  color: var(--ok);
  border: 1px solid var(--ok-border);
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 600;
  padding: 0.2rem 0.7rem;
}

main { flex: 1; width: 100%; max-width: 760px; margin: 0 auto; padding: 2rem 1.2rem; }

.screen.hidden, .hidden { display: none; }

h1 { font-size: 1.7rem; line-height: 1.25; margin-bottom: 0.7rem; }
.sub { color: var(--muted); margin-bottom: 1.6rem; }

.mode-cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; }
@media (max-width: 640px) { .mode-cards { grid-template-columns: 1fr; } }

.card {
  text-align: left;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 1.2rem;
  cursor: pointer;
  transition: border-color .15s, transform .15s, box-shadow .15s;
  font: inherit;
  color: inherit;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}
.card:hover { border-color: var(--red); transform: translateY(-2px); box-shadow: var(--shadow); }
.card h2 { font-size: 1.05rem; }
.card p { color: var(--muted); font-size: 0.87rem; flex: 1; }
.card-extra { margin-top: 0.3rem; }
.card-extra select { width: 100%; }

.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.8rem;
  margin-top: 1.4rem;
}
@media (max-width: 640px) { .stats { grid-template-columns: repeat(2, 1fr); } }
.stat {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 0.8rem;
  text-align: center;
}
.stat-num { font-size: 1.25rem; font-weight: 700; }
.stat-label { font-size: 0.75rem; color: var(--muted); }

.exam-date-box {
  margin-top: 1.4rem;
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex-wrap: wrap;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 0.8rem 1rem;
  font-size: 0.9rem;
}
.exam-date-box label { color: var(--muted); }
.exam-date-box input[type="date"] {
  padding: 0.4rem 0.6rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
  color: var(--ink);
  font: inherit;
}
.exam-date-box .note { margin: 0; }

.pricing {
  margin-top: 1.6rem;
  background: var(--card);
  border: 1.5px solid var(--red);
  border-radius: 14px;
  padding: 1.2rem;
}
.pricing-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1.2rem;
  flex-wrap: wrap;
}
.pricing h2 { font-size: 1.1rem; margin-bottom: 0.3rem; }
.pricing p { color: var(--muted); font-size: 0.9rem; max-width: 42ch; }
.pricing-cta { text-align: center; }
.price { font-size: 1.5rem; font-weight: 800; margin-bottom: 0.4rem; }

.note { margin-top: 1.2rem; font-size: 0.8rem; color: var(--muted); }

.quiz-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 0.6rem; color: var(--muted); font-size: 0.9rem; }
.timer { font-variant-numeric: tabular-nums; font-weight: 600; color: var(--ink); background: var(--card); border: 1px solid var(--border); padding: 0.25rem 0.7rem; border-radius: 999px; }
.timer.low { color: var(--err); border-color: var(--err); }

.progressbar {
  height: 5px;
  background: var(--border);
  border-radius: 999px;
  overflow: hidden;
  margin-bottom: 0.9rem;
}
#progressbar-fill {
  height: 100%;
  width: 0;
  background: var(--red);
  border-radius: 999px;
  transition: width .25s;
}

.qcard { background: var(--card); border: 1px solid var(--border); border-radius: 14px; padding: 1.4rem; }
.theme { font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.06em; color: var(--red); font-weight: 700; margin-bottom: 0.5rem; }
#q-text { font-size: 1.2rem; margin-bottom: 0.4rem; }

.q-translation {
  font-size: 1.02rem;
  color: var(--muted);
  font-style: italic;
  margin-bottom: 1.1rem;
  padding-left: 0.7rem;
  border-left: 3px solid var(--border);
}
.q-translation[dir="rtl"] {
  padding-left: 0; padding-right: 0.7rem;
  border-left: none; border-right: 3px solid var(--border);
  text-align: right;
}
.opt-tr {
  display: block;
  font-size: 0.86rem;
  color: var(--muted);
  font-style: italic;
  margin-top: 0.2rem;
}
.opt-tr[dir="rtl"] { text-align: right; }

.q-terms {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem;
  margin: 0 0 1.1rem;
}
.terms-label { font-size: 0.82rem; color: var(--muted); margin-right: 0.1rem; }
.term-chip {
  font: inherit;
  font-size: 0.82rem;
  background: transparent;
  border: 1px dashed var(--border);
  border-radius: 999px;
  padding: 0.15rem 0.6rem;
  color: var(--ink);
  cursor: help;
}
.term-chip:hover { border-color: var(--red); border-style: solid; }
.term-chip.active { border-style: solid; border-color: var(--red); color: var(--red); }
.term-def {
  flex-basis: 100%;
  font-size: 0.86rem;
  color: var(--muted);
  background: var(--bg);
  border-radius: 8px;
  padding: 0.5rem 0.7rem;
  margin-top: 0.3rem;
}
.term-def[dir="rtl"] { text-align: right; }

.quiz-head-right { display: flex; align-items: center; gap: 0.6rem; }
.translate-toggle {
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.25rem 0.7rem;
  font: inherit;
  font-size: 0.8rem;
  color: var(--muted);
  cursor: pointer;
}
.translate-toggle:hover { border-color: var(--red); color: var(--ink); }

.options { display: grid; gap: 0.6rem; }
.opt {
  text-align: left;
  padding: 0.75rem 0.9rem;
  border: 1.5px solid var(--border);
  border-radius: 10px;
  background: var(--card);
  color: var(--ink);
  cursor: pointer;
  font: inherit;
  transition: border-color .12s, background .12s;
}
.opt:hover:not(:disabled) { border-color: var(--red); }
.opt:disabled { cursor: default; }
.opt.correct { border-color: var(--ok); background: var(--ok-bg); }
.opt.wrong { border-color: var(--err); background: var(--err-bg); }
.opt .letter { font-weight: 700; margin-right: 0.5rem; color: var(--muted); }

.feedback { margin-top: 1rem; padding: 0.9rem 1rem; border-radius: 10px; font-size: 0.95rem; }
.feedback.good { background: var(--ok-bg); border: 1px solid var(--ok-border); }
.feedback.bad { background: var(--err-bg); border: 1px solid var(--err-border); }
.feedback .expl { display: block; margin-top: 0.4rem; color: var(--muted); }

.quiz-actions { margin-top: 1.2rem; display: flex; gap: 0.8rem; align-items: center; flex-wrap: wrap; }
.quiz-actions.center { justify-content: center; }
.kbd-hint { font-size: 0.75rem; color: var(--muted); margin-left: auto; }

button.primary {
  background: var(--red);
  color: #fff;
  border: none;
  border-radius: 10px;
  padding: 0.65rem 1.4rem;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}
button.primary:hover { background: var(--red-dark); }
button.primary:disabled { opacity: 0.6; cursor: wait; }
button.ghost {
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.65rem 1.1rem;
  font: inherit;
  color: var(--muted);
  cursor: pointer;
}

.result-box { text-align: center; margin-bottom: 1.6rem; }
#result-badge { font-size: 3rem; margin-bottom: 0.4rem; }

.review-item { background: var(--card); border: 1px solid var(--border); border-radius: 12px; padding: 1rem 1.1rem; margin-bottom: 0.8rem; }
.review-item .rq { font-weight: 600; margin-bottom: 0.3rem; }
.review-item .ra { font-size: 0.92rem; }
.review-item .ra.ok { color: var(--ok); }
.review-item .ra.err { color: var(--err); }
.review-item .expl { font-size: 0.88rem; color: var(--muted); margin-top: 0.4rem; }

dialog {
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--card);
  color: var(--ink);
  padding: 1.5rem;
  max-width: 420px;
  width: calc(100vw - 2.4rem);
}
dialog::backdrop { background: rgba(0, 0, 0, .45); }
dialog h2 { margin-bottom: 0.4rem; }
dialog input[type="email"] {
  width: 100%;
  padding: 0.7rem 0.9rem;
  border: 1.5px solid var(--border);
  border-radius: 10px;
  font: inherit;
  background: var(--bg);
  color: var(--ink);
}
.error { color: var(--err); font-size: 0.85rem; margin-top: 0.5rem; }

.toast {
  position: fixed;
  bottom: 1.4rem;
  left: 50%;
  transform: translateX(-50%);
  background: var(--ink);
  color: var(--bg);
  padding: 0.7rem 1.2rem;
  border-radius: 10px;
  font-size: 0.9rem;
  box-shadow: var(--shadow);
  z-index: 50;
}

footer { text-align: center; padding: 1.2rem; color: var(--muted); font-size: 0.78rem; }