/* Interactive quiz widget — styled with Material theme variables (light + dark aware). */

.quiz-app {
  margin: 1.5rem 0;
}

.quiz-header {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: .5rem;
  border-bottom: 2px solid var(--md-primary-fg-color);
  padding-bottom: .4rem;
}
.quiz-title { margin: 0; }
.quiz-score {
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--md-primary-fg-color);
}
.quiz-intro { color: var(--md-default-fg-color--light); margin: .5rem 0 1rem; }

/* Difficulty filter */
.quiz-filter { display: flex; flex-wrap: wrap; gap: .4rem; margin-bottom: 1rem; }
.quiz-filter-btn {
  border: 1px solid var(--md-default-fg-color--lighter);
  background: transparent;
  color: var(--md-default-fg-color--light);
  border-radius: 1rem;
  padding: .15rem .8rem;
  font-size: .75rem;
  cursor: pointer;
  transition: all .15s;
}
.quiz-filter-btn:hover { border-color: var(--md-primary-fg-color); }
.quiz-filter-btn.active {
  background: var(--md-primary-fg-color);
  color: var(--md-primary-bg-color);
  border-color: var(--md-primary-fg-color);
}

/* Question card */
.quiz-q {
  border: 1px solid var(--md-default-fg-color--lightest);
  border-radius: .3rem;
  padding: 1rem;
  margin-bottom: 1rem;
  background: var(--md-code-bg-color);
}
.quiz-q-meta { display: flex; gap: .5rem; align-items: center; margin-bottom: .4rem; }
.quiz-badge {
  text-transform: uppercase;
  font-size: .62rem;
  font-weight: 700;
  letter-spacing: .04em;
  padding: .1rem .45rem;
  border-radius: .2rem;
  color: #fff;
}
.quiz-easy   { background: #2e7d32; }
.quiz-medium { background: #ed6c02; }
.quiz-hard   { background: #c62828; }
.quiz-lesson { font-size: .7rem; color: var(--md-default-fg-color--light); font-family: var(--md-code-font-family); }
.quiz-q-text { font-weight: 600; margin: .2rem 0 .8rem; }

/* Options */
.quiz-opts { display: flex; flex-direction: column; gap: .45rem; }
.quiz-opt {
  text-align: left;
  border: 1px solid var(--md-default-fg-color--lighter);
  background: var(--md-default-bg-color);
  color: var(--md-default-fg-color);
  border-radius: .3rem;
  padding: .55rem .8rem;
  font-size: .8rem;
  cursor: pointer;
  transition: border-color .15s, background .15s;
}
.quiz-opt:hover:not(:disabled) { border-color: var(--md-primary-fg-color); }
.quiz-opt:disabled { cursor: default; opacity: 1; }
.quiz-opt.correct {
  border-color: #2e7d32;
  background: color-mix(in srgb, #2e7d32 14%, var(--md-default-bg-color));
  font-weight: 600;
}
.quiz-opt.incorrect {
  border-color: #c62828;
  background: color-mix(in srgb, #c62828 14%, var(--md-default-bg-color));
}

/* Explanation */
.quiz-explain {
  margin-top: .7rem;
  padding: .6rem .8rem;
  border-radius: .3rem;
  border-left: 3px solid;
  font-size: .8rem;
}
.quiz-explain.ok { border-color: #2e7d32; background: color-mix(in srgb, #2e7d32 8%, transparent); }
.quiz-explain.no { border-color: #c62828; background: color-mix(in srgb, #c62828 8%, transparent); }
.quiz-verdict { font-weight: 700; display: block; margin-bottom: .25rem; }
.quiz-explain.ok .quiz-verdict { color: #2e7d32; }
.quiz-explain.no .quiz-verdict { color: #c62828; }
.quiz-explain-text { margin: 0; }
.quiz-cite { margin: .4rem 0 0; font-size: .72rem; }

/* Footer */
.quiz-footer { margin-top: 1rem; }
.quiz-reset {
  border: 1px solid var(--md-primary-fg-color);
  background: transparent;
  color: var(--md-primary-fg-color);
  border-radius: .3rem;
  padding: .35rem 1rem;
  font-size: .8rem;
  cursor: pointer;
}
.quiz-reset:hover { background: var(--md-primary-fg-color); color: var(--md-primary-bg-color); }
.quiz-skillnote { font-size: .75rem; color: var(--md-default-fg-color--light); margin: .6rem 0 0; }