.learning-area { background: var(--deep); padding: 42px 0 64px; }
.quiz-container { max-width: 1140px; }
.quiz-heading { display: flex; align-items: flex-end; justify-content: space-between; gap: 24px; margin-bottom: 32px; color: white; }
.quiz-heading .eyebrow { color: var(--blue-light); margin-bottom: 13px; font-size: .875rem; }
.quiz-heading h1 { font-size: clamp(2rem, 3.5vw, 3.4rem); }
.quiz-heading p { color: #bfcec8; margin-top: 12px; }
.quiz-edition { color: #bfd6f8; font-size: .875rem; letter-spacing: .06em; white-space: nowrap; }
.quiz-panel { background: #fff; border-radius: 8px; overflow: hidden; scroll-margin-top: 120px; }
.quiz-panel:has(.quiz-intro) { display: grid; grid-template-columns: 1.55fr 1fr; }
.quiz-intro { padding: clamp(24px, 4vw, 48px); }
.quiz-kicker { display: block; color: var(--blue-dark); font-size: .875rem; font-weight: 650; margin-bottom: 17px; }
.quiz-intro h2 { font-size: clamp(1.8rem, 2.8vw, 2.7rem); margin-bottom: 22px; }
.quiz-intro > p { max-width: 560px; }
.quiz-intro-facts { display: grid; grid-template-columns: 1fr 1fr 1.2fr; gap: 20px; margin: 32px 0; padding-block: 22px; border-block: 1px solid var(--line); font-size: .875rem; color: var(--muted); line-height: 1.5; }
.quiz-intro-facts strong { display: block; font: 700 1.7rem/1.5 var(--heading); color: var(--ink); }
.quiz-intro-facts span:last-child strong { font-size: 1.25rem; padding-block: 5px; }
.quiz-intro-aside { padding: 40px 32px; background: #edf4fc; border-left: 1px solid #d9e6f5; }
.quiz-intro-aside ol { counter-reset: topics; list-style: none; margin: 0 0 28px; padding: 0; }
.quiz-intro-aside li { position: relative; padding: 0 0 22px 40px; counter-increment: topics; }
.quiz-intro-aside li::before { content: '0' counter(topics); position: absolute; left: 0; top: 0; color: var(--blue); font-size: .875rem; font-weight: 700; }
.quiz-intro-aside strong, .quiz-intro-aside span { display: block; }
.quiz-intro-aside li span { margin-top: 4px; color: #526974; font-size: .9375rem; line-height: 1.65; }
.quiz-intro-aside > p { border-top: 1px solid #d3e0ef; padding-top: 24px; font-size: .9375rem; }
.quiz-load-status:not(:empty) { margin-top: 16px; }
.quiz-panel .button:disabled { opacity: .65; cursor: wait; }
.quiz-session-head { display: flex; justify-content: space-between; gap: 20px; padding: 20px 36px; font-size: .9375rem; background: #f5f8fb; }
.quiz-session-head strong { margin-left: 5px; }
.quiz-progress { display: block; width: 100%; height: 4px; border: 0; background: #e5eee9; color: var(--blue); appearance: none; }
.quiz-progress::-webkit-progress-bar { background: #e5eee9; }
.quiz-progress::-webkit-progress-value { background: var(--blue); }
.quiz-progress::-moz-progress-bar { background: var(--blue); }
.quiz-question { padding: 32px 40px 36px; }
.quiz-tags { display: flex; flex-wrap: wrap; gap: 10px 18px; margin-bottom: 22px; color: var(--muted); font-size: .875rem; }
.quiz-tags span:first-child { color: var(--blue-dark); font-weight: 650; }
.quiz-tags span + span::before { content: '·'; padding-right: 18px; color: #80948c; }
.quiz-question fieldset { border: 0; margin: 0; padding: 0; min-width: 0; }
.quiz-question legend { float: left; width: 100%; font: 600 clamp(1.25rem, 2.1vw, 1.85rem)/1.4 var(--heading); letter-spacing: -.025em; margin-bottom: 27px; padding: 0; }
.quiz-options { display: grid; gap: 12px; clear: both; }
.quiz-option { display: flex; align-items: center; gap: 13px; padding: 17px 20px; border: 1px solid #cfdad6; border-radius: 5px; cursor: pointer; line-height: 1.5; transition: background .15s, border-color .15s; }
.quiz-option:hover { background: #f6f9fc; border-color: #88a9d5; }
.quiz-option:has(input:checked) { background: #edf4fc; border-color: var(--blue); box-shadow: inset 3px 0 var(--blue); }
.quiz-option:has(input:focus-visible) { outline: 3px solid #508cef; outline-offset: 3px; }
.quiz-option input { width: 19px; height: 19px; margin: 0; flex: 0 0 auto; accent-color: var(--blue); }
.quiz-letter { color: var(--muted); font-size: .875rem; font-weight: 650; }
.quiz-option-copy { flex: 1; }
.quiz-option-result { font-size: .875rem; font-weight: 650; }
.quiz-option:has(input:disabled) { cursor: default; }
.quiz-option.is-correct, .quiz-option.is-correct:has(input:checked) { background: #edf7ef; border-color: #2e7951; box-shadow: inset 3px 0 #2e7951; }
.quiz-option.is-correct .quiz-option-result { color: #22643e; }
.quiz-option.is-incorrect, .quiz-option.is-incorrect:has(input:checked) { background: #fff6ee; border-color: #ac6228; box-shadow: inset 3px 0 #ac6228; }
.quiz-option.is-incorrect .quiz-option-result { color: #884916; }
.quiz-question-actions { display: flex; align-items: center; flex-wrap: wrap; gap: 20px; margin-top: 26px; }
.quiz-hint { color: var(--muted); font-size: .875rem; }
.quiz-feedback { background: #f1f6fa; border-left: 3px solid var(--blue); margin-top: 28px; padding: 24px; }
.quiz-feedback.is-correct { background: #f0f7f1; border-color: #2e7951; }
.quiz-feedback h2 { font-size: 1.35rem; letter-spacing: -.025em; margin-bottom: 13px; }
.quiz-feedback p + p { margin-top: 12px; }
.quiz-feedback p { color: #3c554b; line-height: 1.75; }
.quiz-misconception { margin: 20px 0; padding: 18px 20px; background: #fff7ef; border-left: 3px solid #ac6228; }
.quiz-misconception h3, .quiz-worked-example h3 { font-size: 1.0625rem; letter-spacing: -.02em; margin-bottom: 10px; }
.quiz-worked-example { margin-top: 24px; }
.quiz-worked-example .quiz-formula { font: 650 1.4rem/1.5 var(--heading); color: var(--blue-dark); background: white; border: 1px solid #d4e0ed; padding: 14px 18px; border-radius: 4px; }
.quiz-worked-example ul, .quiz-worked-example ol { padding-left: 24px; margin: 17px 0 23px; color: #3c554b; }
.quiz-worked-example li + li { margin-top: 8px; }
.quiz-worked-example .quiz-takeaway { padding-top: 17px; border-top: 1px solid #ccdad2; font-weight: 650; color: var(--ink); }
.quiz-sources { display: flex; flex-direction: column; align-items: flex-start; gap: 5px; margin-top: 20px; font-size: .875rem; overflow-wrap: anywhere; }
.quiz-sources > span:first-child { color: #567066; font-weight: 650; }
.quiz-sources a { color: var(--blue-dark); text-decoration: underline; text-underline-offset: 3px; }
.quiz-footnote { color: #bfd0c7; margin-top: 28px; font-size: .875rem; max-width: 1000px; }
.quiz-footnote p { color: inherit; }
.quiz-footnote details { margin-top: 15px; }
.quiz-footnote summary { color: #d9e5df; cursor: pointer; width: fit-content; }
.quiz-footnote details p { margin-top: 12px; }
.quiz-results { padding: 40px; }
.quiz-result-top { display: flex; justify-content: space-between; gap: 40px; border-bottom: 1px solid var(--line); padding-bottom: 36px; margin-bottom: 30px; }
.quiz-result-top h2 { max-width: 640px; font-size: clamp(1.8rem, 3vw, 2.6rem); }
.quiz-result-top p { margin-block: 18px 25px; }
.quiz-score { align-self: flex-start; text-align: center; min-width: 170px; padding: 26px; background: var(--blue-soft); border-radius: 5px; }
.quiz-score > strong { display: block; color: var(--blue-dark); font: 700 4rem/1.2 var(--heading); }
.quiz-score strong span { font-size: 1.5rem; color: var(--muted); }
.quiz-score > span { font-size: .875rem; color: var(--muted); }
.quiz-results h3 { font-size: 1.3rem; }
.quiz-topic-results { display: grid; grid-template-columns: 1fr 1fr; gap: 0 32px; margin: 16px 0 35px; }
.quiz-topic-results > div { display: flex; justify-content: space-between; gap: 16px; padding-block: 13px; border-bottom: 1px solid var(--line); font-size: .9375rem; }
.quiz-topic-results strong { white-space: nowrap; color: var(--blue-dark); }
.quiz-review-title { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; margin-bottom: 18px; }
.quiz-review-title > span { font-size: .875rem; color: var(--muted); }
.quiz-review details { border-top: 1px solid var(--line); }
.quiz-review summary { display: flex; gap: 18px; padding: 20px 0; cursor: pointer; align-items: baseline; line-height: 1.6; }
.quiz-review summary::after { content: '+'; margin-left: auto; font-size: 1.2rem; flex-shrink: 0; }
.quiz-review details[open] summary::after { content: '−'; }
.quiz-review-mark { font-size: .875rem; font-weight: 650; min-width: 76px; white-space: nowrap; }
.quiz-review-mark.is-correct { color: #22643e; }
.quiz-review-mark.is-incorrect { color: #884916; }
.quiz-review-body { padding: 0 25px 26px 94px; }
.quiz-review-body p + p { margin-top: 12px; }
@media (max-width: 800px) {
  .quiz-heading { align-items: flex-start; flex-direction: column; gap: 14px; }
  .quiz-panel:has(.quiz-intro) { grid-template-columns: 1fr; }
  .quiz-intro-aside { border-left: 0; border-top: 1px solid #d9e6f5; padding: 26px; }
  .quiz-intro-aside ol { margin-bottom: 0; }
  .quiz-question, .quiz-results { padding: 26px; }
  .quiz-result-top { flex-direction: column-reverse; gap: 24px; }
  .quiz-score { align-self: stretch; padding: 20px; }
  .quiz-score > strong { font-size: 3rem; }
}
@media (max-width: 500px) {
  .learning-area { padding-top: 26px; }
  .quiz-heading h1 { font-size: 2rem; }
  .quiz-edition { font-size: .8125rem; }
  .quiz-intro, .quiz-question, .quiz-results { padding: 24px 20px; }
  .quiz-intro-facts { gap: 10px; font-size: .875rem; }
  .quiz-intro-facts strong { font-size: 1.5rem; }
  .quiz-intro-facts span:last-child strong { font-size: 1.05rem; }
  .quiz-session-head { padding: 17px 20px; gap: 10px; font-size: .875rem; }
  .quiz-tags { gap: 6px 12px; }
  .quiz-tags span + span::before { padding-right: 12px; }
  .quiz-option { flex-wrap: wrap; gap: 10px; padding: 14px; }
  .quiz-option-copy { flex-basis: calc(100% - 60px); }
  .quiz-option-result:not(:empty) { padding-left: 48px; }
  .quiz-feedback { padding: 20px; }
  .quiz-question-actions .button, .quiz-result-top .button { width: 100%; }
  .quiz-topic-results { grid-template-columns: 1fr; }
  .quiz-review summary { flex-wrap: wrap; gap: 6px; position: relative; padding-right: 20px; }
  .quiz-review summary::after { position: absolute; right: 0; top: 20px; }
  .quiz-review-mark { width: 100%; }
  .quiz-review-body { padding: 0 0 24px; }
}
@media (prefers-reduced-motion: reduce) { .quiz-option { transition: none; } }