:root {
  --bg: #f3f6f9;
  --card: #fff;
  --text: #1d2b36;
  --muted: #66788a;
  --line: #dde4ea;
  --brand: #0b6fa4;
  --ok: #2ecc71;
  --ok-soft: #e4f8ec;
  --bad: #e74a25;
  --bad-soft: #fde9e4;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.5 system-ui, "Segoe UI", Roboto, sans-serif;
}

header { background: var(--brand); padding: 12px 16px; }
.brand { color: #fff; font-weight: 700; text-decoration: none; }

main { max-width: 860px; margin: 0 auto; padding: 16px; }

h2 { margin: 24px 0 8px; }

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 16px;
  margin-bottom: 12px;
}

.row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 10px 0;
  border-top: 1px solid var(--line);
}
.row:first-child { border-top: 0; }
.row .name { font-weight: 600; }
.row .meta { color: var(--muted); font-size: 14px; }
.actions { display: flex; flex-wrap: wrap; gap: 6px; }

button {
  font: inherit;
  cursor: pointer;
  border: 1px solid var(--brand);
  background: #fff;
  color: var(--brand);
  border-radius: 6px;
  padding: 6px 12px;
}
button:hover { background: #e8f3f9; }
button.primary { background: var(--brand); color: #fff; }
button.primary:hover { background: #095a86; }

.topline {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  color: var(--muted);
  font-size: 14px;
  margin-bottom: 8px;
}

.bar { height: 6px; background: var(--line); border-radius: 3px; overflow: hidden; margin-bottom: 12px; }
.bar > div { height: 100%; background: var(--brand); }

.question { font-size: 18px; font-weight: 600; margin: 0 0 12px; }
.tag {
  display: inline-block;
  font-size: 12px;
  color: var(--muted);
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 0 6px;
  margin-right: 4px;
}

img { max-width: 100%; height: auto; display: block; margin: 8px 0; }

.option {
  display: block;
  width: 100%;
  text-align: left;
  color: var(--text);
  background: #f7f9fb;
  border: 1px solid var(--line);
  margin-bottom: 8px;
  padding: 10px 12px;
}
.option:hover { background: #eef3f7; }
.option.locked { cursor: default; }
.option.locked:hover { background: #f7f9fb; }
.option.picked { border-color: var(--brand); background: #e8f3f9; }
.option.correct, .option.correct:hover { background: var(--ok); border-color: var(--ok); color: #fff; }
.option.wrong, .option.wrong:hover { background: var(--bad); border-color: var(--bad); color: #fff; }

.why { font-size: 14px; margin: -4px 0 10px; padding: 6px 12px; border-left: 3px solid var(--line); color: var(--muted); }
.why.ok { border-color: var(--ok); background: var(--ok-soft); color: var(--text); }
.why.bad { border-color: var(--bad); background: var(--bad-soft); color: var(--text); }

.lesson h2 { margin-top: 0; }
.lesson h3 { margin: 16px 0 4px; font-size: 16px; }
.lesson p { margin: 0 0 10px; }
.lesson ul { margin: 0 0 8px; padding-left: 20px; }
.listen { align-items: center; margin: 8px 0; }
select.rate { font: inherit; padding: 5px 8px; border: 1px solid var(--line); border-radius: 6px; background: #fff; color: var(--text); }

.footer { display: flex; justify-content: space-between; gap: 8px; margin-top: 12px; }

.score { font-size: 32px; font-weight: 700; }
.muted { color: var(--muted); }