/* End-of-chapter practice quizzes (instant feedback, no timer). */

.practice-quiz {
  max-width: 900px;
  margin: 1.5rem 0;
}

.pq-scorebar {
  position: sticky;
  top: 3.6rem;
  z-index: 2;
  padding: 0.6em 1em;
  margin-bottom: 1em;
  border-radius: 8px;
  border: 1px solid var(--aura-slate-200);
  background: var(--aura-slate-50);
  color: var(--aura-slate-900);
  font-weight: 600;
  font-size: 0.9em;
}

.pq-card {
  border: 1px solid var(--md-default-fg-color--lightest);
  border-radius: 10px;
  padding: 1.1em 1.4em;
  margin-bottom: 1.1em;
  background: var(--md-default-bg-color);
  box-shadow: 0 2px 16px rgba(15, 23, 42, 0.04);
}

.pq-head {
  display: flex;
  gap: 0.6em;
  align-items: center;
  margin-bottom: 0.5em;
}

.pq-num {
  font-weight: 700;
  color: var(--md-primary-fg-color);
}

.pq-type {
  font-size: 0.72em;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 0.15em 0.6em;
  border-radius: 999px;
  background: var(--aura-slate-100);
  color: var(--aura-slate-800);
}

.pq-stem {
  font-size: 1.0em;
  line-height: 1.55;
  margin-bottom: 0.8em;
}

.pq-code {
  background: var(--md-code-bg-color);
  padding: 0.85em 1em;
  border-radius: 6px;
  overflow-x: auto;
  margin: 0.5em 0 1em;
  font-family: var(--md-code-font);
  font-size: 0.82em;
  line-height: 1.5;
}

.pq-code code {
  background: transparent;
  padding: 0;
  white-space: pre;
}

.pq-options {
  display: flex;
  flex-direction: column;
  gap: 0.5em;
}

.pq-option {
  display: flex;
  align-items: flex-start;
  gap: 0.75em;
  width: 100%;
  text-align: left;
  font: inherit;
  color: inherit;
  padding: 0.65em 0.9em;
  border: 1px solid var(--md-default-fg-color--lightest);
  border-radius: 6px;
  background: transparent;
  cursor: pointer;
  transition: background-color 120ms ease, border-color 120ms ease;
}

.pq-option:hover:not(:disabled) {
  background: var(--md-default-fg-color--lightest);
}

.pq-option:disabled {
  cursor: default;
}

.pq-option:focus-visible {
  outline: 2px solid var(--md-primary-fg-color);
  outline-offset: 2px;
}

.pq-letter {
  font-weight: 700;
  color: var(--md-primary-fg-color);
  flex-shrink: 0;
  min-width: 1.25em;
}

.pq-option-text {
  flex: 1;
  line-height: 1.5;
}

.pq-option.is-correct {
  background: #e6f7ea;
  border-color: #4caf50;
}

.pq-option.is-wrong {
  background: #fdeaea;
  border-color: #e53935;
}

.pq-feedback {
  margin-top: 1em;
  padding: 0.8em 1em;
  border-radius: 6px;
  border-left: 4px solid;
  font-size: 0.92em;
  line-height: 1.55;
}

.pq-feedback.correct {
  background: #f1faf3;
  border-color: #4caf50;
}

.pq-feedback.wrong {
  background: #fdf3f3;
  border-color: #e53935;
}

.pq-status {
  font-weight: 700;
  margin-bottom: 0.4em;
}

.md-typeset .pq-why {
  margin: 0.3em 0 0.5em;
  padding-left: 0;
  list-style: none;
}

.md-typeset .pq-why li {
  margin: 0.35em 0;
  padding-left: 0;
}

.pq-why li.why-correct strong {
  color: #2e7d32;
}

.pq-why li.why-wrong strong {
  color: #c62828;
}

.pq-takeaway {
  margin-top: 0.5em;
  padding-top: 0.5em;
  border-top: 1px dashed var(--md-default-fg-color--lighter);
}

.pq-controls {
  padding: 0.5em 0 1em;
}