:root {
  --bg: #f6f7fb;
  --card: #ffffff;
  --ink: #111827;
  --muted: #4b5563;
  --accent: #0b5fff;
  --accent-2: #0e9f6e;
  --danger: #d14343;
  --border: #dbe2ef;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "Avenir Next", "Trebuchet MS", sans-serif;
  color: var(--ink);
  background: radial-gradient(circle at top left, #e9f0ff 0%, #f8fbff 35%, var(--bg) 100%);
}

.app {
  max-width: 860px;
  margin: 0 auto;
  padding: 20px;
}

.mute-btn {
  min-width: 56px;
  width: 56px;
  height: 56px;
  padding: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: 0 0 auto;
}

.mute-btn.is-muted {
  border-color: #ffd1d1;
  background: #fff0f0;
  color: #8b1e1e;
}

.mute-btn svg {
  width: 30px;
  height: 30px;
  stroke-width: 1.8;
}

.hero h1 { margin: 6px 0; }
.eyebrow { text-transform: uppercase; letter-spacing: 0.08em; color: var(--accent); margin: 0; font-weight: 700; }
.sub { color: var(--muted); margin-top: 0; }

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 20px;
  box-shadow: 0 8px 20px rgba(17, 24, 39, 0.06);
  margin-top: 16px;
}

.hidden { display: none; }

.options {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 12px;
  margin: 14px 0;
}

label {
  display: grid;
  gap: 6px;
  font-weight: 600;
}

select {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px;
  font-size: 15px;
}

.btn {
  background: var(--accent);
  color: white;
  border: 0;
  border-radius: 10px;
  padding: 10px 16px;
  font-weight: 700;
  cursor: pointer;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn.ghost {
  background: white;
  color: var(--ink);
  border: 1px solid var(--border);
}

.top-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.timer {
  padding: 6px 10px;
  border-radius: 999px;
  border: 1px solid var(--border);
  font-weight: 700;
}

.timer.warn {
  background: #fff0f0;
  border-color: #ffd1d1;
  color: var(--danger);
}

.progress-bar {
  background: #eef2ff;
  border-radius: 999px;
  height: 10px;
  overflow: hidden;
  margin: 10px 0 20px;
}

#progress-fill {
  display: block;
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--accent), #4f8dff);
}

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

.answer-btn {
  text-align: left;
  border: 1px solid var(--border);
  background: #fff;
  color: var(--ink);
  border-radius: 10px;
  padding: 11px;
  cursor: pointer;
  font-size: 15px;
}

.answer-btn:hover { border-color: #b5c5e6; }
.answer-btn.selected { border-color: var(--accent); background: #eff5ff; }
.answer-btn.correct { border-color: var(--accent-2); background: #ecfdf3; }
.answer-btn.incorrect { border-color: var(--danger); background: #fff1f1; }

.feedback {
  min-height: 22px;
  color: var(--muted);
  margin: 14px 0;
}

.controls {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.score-line {
  font-size: 20px;
  font-weight: 800;
}

.breakdown {
  background: #f8fafc;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px;
}

.missed-list {
  margin-top: 10px;
  display: grid;
  gap: 10px;
}

.missed-item {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px;
}

.note { color: var(--muted); font-size: 14px; }

@media (max-width: 640px) {
  .app { padding: 14px; }
  .card { padding: 14px; }
}