.binary-eval-quiz-set {
  --quiz-accent: var(--course-link-strong, #0969da);
  --quiz-border: var(--course-border-strong, #b8c7d9);
  --quiz-surface: var(--course-panel-soft, #f5f9ff);
  --quiz-card: var(--course-panel, #ffffff);
  --quiz-text: var(--pst-color-text-base, #1f2328);
  --quiz-muted: var(--course-muted, #57606a);
  --quiz-correct: #1a7f37;
  --quiz-correct-bg: #dafbe1;
  --quiz-incorrect: #cf222e;
  --quiz-incorrect-bg: #ffebe9;
  margin: 2rem 0;
  padding: 1.25rem;
  border: 1px solid var(--quiz-border);
  border-left: 0.35rem solid var(--quiz-accent);
  border-radius: 0.72rem;
  background: var(--quiz-surface);
  color: var(--quiz-text);
  font-size: 0.9em;
  transition: border-color 140ms ease, box-shadow 140ms ease,
    transform 140ms ease;
}

.binary-eval-quiz-set__title {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin: 0;
  color: var(--quiz-text);
  font-size: 1em;
  font-weight: 700;
  line-height: 1.6;
  cursor: pointer;
  list-style: none;
}

.binary-eval-quiz-set__title::-webkit-details-marker {
  display: none;
}

.binary-eval-quiz-set__title::before {
  flex: 0 0 auto;
  content: "▸";
  color: var(--quiz-accent);
  transition: transform 120ms ease;
}

.binary-eval-quiz-set[open] > .binary-eval-quiz-set__title {
  margin-bottom: 0.35rem;
}

.binary-eval-quiz-set[open] > .binary-eval-quiz-set__title::before {
  transform: rotate(90deg);
}

.binary-eval-quiz-set__title:focus-visible {
  outline: 3px solid var(--quiz-accent);
  outline-offset: 4px;
  border-radius: 0.25rem;
}

.binary-eval-quiz-set__title-text {
  min-width: 0;
}

.binary-eval-quiz-set__toggle-label {
  flex: 0 0 auto;
  margin-left: auto;
  padding: 0.1rem 0.5rem;
  border: 1px solid var(--quiz-border);
  border-radius: 999px;
  color: var(--quiz-muted);
  font-size: 0.82em;
  font-weight: 600;
  white-space: nowrap;
}

.binary-eval-quiz-set__toggle-open {
  display: none;
}

.binary-eval-quiz-set[open] .binary-eval-quiz-set__toggle-closed {
  display: none;
}

.binary-eval-quiz-set[open] .binary-eval-quiz-set__toggle-open {
  display: inline;
}

.binary-eval-quiz-set__intro {
  margin: 0 0 1rem;
  color: var(--quiz-muted);
  text-indent: 0;
}

.binary-eval-quiz {
  margin-top: 1rem;
  padding: 1rem;
  border: 1px solid var(--quiz-border);
  border-radius: 0.55rem;
  background: var(--quiz-card);
  box-shadow: 0 1px 2px rgb(31 35 40 / 8%);
}

.binary-eval-quiz__meta {
  display: inline-block;
  margin-bottom: 0.4rem;
  padding: 0.15rem 0.5rem;
  border-radius: 999px;
  background: #ddf4ff;
  color: #0550ae;
  font-size: 0.82rem;
  font-weight: 700;
  line-height: 1.5;
}

.binary-eval-quiz__question {
  margin: 0 0 0.75rem;
  color: var(--quiz-text);
  font-size: 1em;
  font-weight: 650;
  line-height: 1.65;
  text-indent: 0;
}

.binary-eval-quiz__fieldset {
  min-width: 0;
  margin: 0;
  padding: 0;
  border: 0;
}

.binary-eval-quiz__fieldset > legend {
  width: 100%;
  padding: 0;
}

.binary-eval-quiz__options {
  display: grid;
  gap: 0.55rem;
}

.binary-eval-quiz__option {
  width: 100%;
  min-height: 2.75rem;
  padding: 0.65rem 0.8rem;
  border: 1px solid var(--quiz-border);
  border-radius: 0.45rem;
  background: var(--quiz-card);
  color: var(--quiz-text);
  font: inherit;
  line-height: 1.5;
  text-align: left;
  cursor: pointer;
  transition: border-color 120ms ease, background-color 120ms ease,
    box-shadow 120ms ease, transform 120ms ease;
}

.binary-eval-quiz__option:hover {
  border-color: var(--quiz-accent);
  background: #f0f7ff;
  box-shadow: 0 0.18rem 0.5rem rgb(31 41 55 / 7%);
  transform: translateY(-1px);
}

.binary-eval-quiz__option:focus-visible {
  outline: 3px solid var(--quiz-accent);
  outline-offset: 2px;
}

.binary-eval-quiz__option.is-correct,
.binary-eval-quiz__option.is-revealed-answer {
  border-color: var(--quiz-correct);
  background: var(--quiz-correct-bg);
}

.binary-eval-quiz__option.is-revealed-answer {
  border-style: dashed;
}

.binary-eval-quiz__option.is-incorrect {
  border-color: var(--quiz-incorrect);
  background: var(--quiz-incorrect-bg);
}

.binary-eval-quiz__feedback {
  margin: 0.8rem 0 0;
  padding: 0.75rem 0.85rem;
  border-left: 0.3rem solid;
  border-radius: 0.35rem;
  line-height: 1.65;
  text-indent: 0;
}

.binary-eval-quiz__feedback.is-correct-feedback {
  border-color: var(--quiz-correct);
  background: var(--quiz-correct-bg);
  color: #116329;
}

.binary-eval-quiz__feedback.is-incorrect-feedback {
  border-color: var(--quiz-incorrect);
  background: var(--quiz-incorrect-bg);
  color: #a40e26;
}

.binary-eval-quiz__feedback[hidden] {
  display: none;
}

.binary-eval-quiz-set noscript p {
  margin: 0.75rem 0 0;
  color: var(--quiz-incorrect);
  text-indent: 0;
}

html[data-theme="dark"] .binary-eval-quiz-set {
  --quiz-accent: var(--course-link-strong, #73a9f3);
  --quiz-border: var(--course-border-strong, #46515e);
  --quiz-surface: var(--course-panel-soft, #181d22);
  --quiz-card: var(--course-panel, #1b2026);
  --quiz-text: var(--pst-color-text-base, #d8dee6);
  --quiz-muted: var(--course-muted, #a5aebb);
  --quiz-correct: #86c7a4;
  --quiz-correct-bg: #20352b;
  --quiz-incorrect: #e09a9a;
  --quiz-incorrect-bg: #3a2729;
}

html[data-theme="dark"] .binary-eval-quiz__meta {
  background: #202e3d;
  color: #a8c8e7;
}

html[data-theme="dark"] .binary-eval-quiz__option:hover {
  background: #232b34;
  box-shadow: 0 0.18rem 0.55rem rgb(0 0 0 / 18%);
}

html[data-theme="dark"] .binary-eval-quiz__feedback.is-correct-feedback,
html[data-theme="dark"] .binary-eval-quiz__feedback.is-incorrect-feedback {
  color: var(--quiz-text);
}

.binary-eval-quiz-set,
.binary-eval-quiz {
  box-shadow: none;
}

@media (hover: hover) and (pointer: fine) {
  .binary-eval-quiz-set:hover {
    border-color: var(--quiz-accent);
    box-shadow: var(
      --course-hover-shadow,
      0 0.45rem 1.1rem rgb(31 41 55 / 10%)
    );
    transform: translateY(-1px);
  }
}

@media (max-width: 640px) {
  .binary-eval-quiz-set {
    padding: 0.85rem;
  }

  .binary-eval-quiz {
    padding: 0.8rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .binary-eval-quiz-set,
  .binary-eval-quiz__option,
  .binary-eval-quiz-set__title::before {
    transition: none;
  }

  .binary-eval-quiz-set:hover,
  .binary-eval-quiz__option:hover {
    transform: none;
  }
}

@media print {
  .binary-eval-quiz-set,
  .binary-eval-quiz {
    break-inside: avoid;
    border-color: #666666;
    background: #ffffff;
    box-shadow: none;
  }

  .binary-eval-quiz__option {
    border-color: #777777;
    background: #ffffff;
    color: #000000;
  }

  .binary-eval-quiz__feedback {
    color: #000000 !important;
  }
}