.reading-course {
  --rc-green: #16776c; --rc-ink: #223c3a; --rc-muted: #627773; --rc-border: #d7e4e0;
  --rc-light: #eff7f4; --rc-white: #fff; --rc-error: #9a5036;
  color: var(--rc-ink); font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  width: 100%; min-width: 0; line-height: 1.65;
}
.reading-course *, .reading-course *::before, .reading-course *::after { box-sizing: border-box; }
.reading-course h1, .reading-course h2, .reading-course h3, .reading-course h4, .reading-course p { margin: 0; }
.reading-course button, .reading-course input { font: inherit; }
.reading-course button { cursor: pointer; }
.reading-course button:disabled { cursor: default; opacity: .5; }
.reading-course button:focus-visible, .reading-course input:focus-visible, .reading-course summary:focus-visible { outline: 3px solid #4cb5a4; outline-offset: 3px; }
.reading-course [lang="en"] { font-family: Georgia, "Times New Roman", serif; overflow-wrap: anywhere; }
.reading-course .rc-header { display: flex; gap: 24px; justify-content: space-between; align-items: center; padding: 12px 0 22px; border-bottom: 2px solid var(--rc-green); }
.reading-course .rc-eyebrow { font-size: 12px; letter-spacing: .14em; font-weight: 750; color: var(--rc-green); margin-bottom: 10px; }
.reading-course h1 { font-size: clamp(24px, 3vw, 34px); line-height: 1.3; margin-bottom: 12px; letter-spacing: -.035em; }
.reading-course .rc-header > div:first-child > p:last-child { max-width: 620px; font-size: 14px; color: var(--rc-muted); }
.reading-course .rc-course-progress { display: grid; width: 115px; flex: 0 0 115px; font-size: 11px; color: var(--rc-muted); }
.reading-course .rc-course-progress strong { font-size: 26px; line-height: 1.2; color: var(--rc-green); }
.reading-course progress { width: 100%; height: 5px; margin-top: 8px; accent-color: var(--rc-green); }
.reading-course .rc-storage-note { font-size: 12px; color: var(--rc-muted); margin: 12px 0 20px; }
.reading-course .rc-catalog { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 10px; margin-bottom: 24px; }
.reading-course .rc-course-card { display: flex; align-items: flex-start; gap: 10px; min-width: 0; padding: 14px; border: 1px solid var(--rc-border); border-radius: 12px; color: var(--rc-ink); text-align: left; background: var(--rc-white); }
.reading-course .rc-course-card[aria-current="page"] { border-color: var(--rc-green); background: var(--rc-light); box-shadow: inset 3px 0 var(--rc-green); }
.reading-course .rc-course-number { font-family: Georgia, serif; font-size: 21px; line-height: 1.2; color: var(--rc-green); }
.reading-course .rc-course-description { display: grid; gap: 3px; min-width: 0; }
.reading-course .rc-course-description strong { font-size: 14px; }
.reading-course .rc-course-description > span { color: var(--rc-muted); font-size: 11px; }
.reading-course .rc-course-description small { font-size: 11px; color: var(--rc-green); }
.reading-course .rc-lesson { border: 1px solid var(--rc-border); border-radius: 16px; background: var(--rc-white); overflow: hidden; }
.reading-course .rc-lesson-title { padding: 22px 24px 18px; }
.reading-course h2 { font-size: 21px; line-height: 1.4; margin-bottom: 7px; }
.reading-course .rc-lesson-title > p { font-size: 13px; color: var(--rc-muted); }
.reading-course .rc-tabs { display: flex; gap: 4px; padding: 0 24px; border-bottom: 1px solid var(--rc-border); }
.reading-course .rc-tabs .rc-button { flex: 1; border: 0; border-radius: 0; background: transparent; padding: 12px 6px; border-bottom: 3px solid transparent; }
.reading-course .rc-tabs .rc-button[aria-current="step"] { border-bottom-color: var(--rc-green); color: var(--rc-green); background: var(--rc-light); }
.reading-course .rc-learn, .reading-course .rc-practice, .reading-course .rc-review, .reading-course .rc-empty { padding: 24px; }
.reading-course .rc-methods { display: grid; gap: 18px; margin-bottom: 26px; }
.reading-course .rc-methods > section { display: flex; gap: 12px; }
.reading-course .rc-method-number { color: var(--rc-green); font-family: Georgia, serif; font-size: 23px; line-height: 1.3; }
.reading-course h3 { font-size: 16px; line-height: 1.55; margin-bottom: 7px; }
.reading-course .rc-methods p { font-size: 14px; }
.reading-course .rc-section-label { font-size: 11px; letter-spacing: .06em; color: var(--rc-green); font-weight: 700; margin-bottom: 12px; }
.reading-course .rc-worked-example { padding: 20px; background: #f8fbfa; border: 1px solid var(--rc-border); border-radius: 10px; }
.reading-course .rc-sentences { display: grid; gap: 5px; }
.reading-course .rc-sentence { display: grid; grid-template-columns: 19px minmax(0, 1fr); gap: 8px; width: 100%; min-width: 0; background: transparent; color: var(--rc-ink); border: 1px solid transparent; border-radius: 7px; padding: 9px 8px; text-align: left; font-size: 16px; line-height: 1.85; }
.reading-course button.rc-sentence:hover { background: #f1f8f5; border-color: var(--rc-border); }
.reading-course .rc-sentence.is-selected { background: #e0f2e9; border-color: #90c5b4; }
.reading-course .rc-line-number { align-self: start; margin-top: 5px; color: var(--rc-muted); font-family: inherit; font-size: 10px; line-height: 1.6; }
.reading-course .rc-static { margin: 0; }
.reading-course .rc-worked-example > h3 { margin-top: 20px; }
.reading-course .rc-example-options { padding-left: 26px; margin: 10px 0; font-size: 15px; }
.reading-course .rc-example-options li { padding: 3px 5px; }
.reading-course .rc-example-options .is-answer { background: #e0f2e9; color: #115d4f; }
.reading-course .rc-example-explanation { border-top: 1px solid var(--rc-border); margin-top: 14px; padding-top: 14px; font-size: 13px; }
.reading-course .rc-example-explanation p { margin-top: 6px; }
.reading-course .rc-button { border: 1px solid #bccfca; border-radius: 8px; padding: 9px 14px; background: var(--rc-white); color: var(--rc-ink); font-size: 13px; font-weight: 650; min-height: 42px; }
.reading-course .rc-button.rc-primary { border-color: var(--rc-green); background: var(--rc-green); color: var(--rc-white); }
.reading-course .rc-actions { display: flex; flex-wrap: wrap; gap: 9px; margin-top: 20px; }
.reading-course .rc-practice-heading { display: flex; gap: 16px; justify-content: space-between; font-size: 13px; margin-bottom: 16px; }
.reading-course .rc-practice-heading > span { color: var(--rc-green); white-space: nowrap; }
.reading-course .rc-question-nav { display: flex; flex-wrap: wrap; gap: 7px; margin-bottom: 20px; }
.reading-course .rc-question-nav .rc-button { font-size: 12px; }
.reading-course .rc-question-nav [aria-current="step"] { background: var(--rc-light); border-color: var(--rc-green); color: var(--rc-green); }
.reading-course .rc-evidence-layout { display: grid; grid-template-columns: minmax(0, 1.07fr) minmax(0, 1fr); gap: 25px; }
.reading-course .rc-passage { min-width: 0; border-right: 1px solid var(--rc-border); padding-right: 20px; }
.reading-course .rc-answer-panel { min-width: 0; }
.reading-course .rc-question-title { font-size: 18px; line-height: 1.55; }
.reading-course .rc-selection-note { font-size: 12px; color: var(--rc-green); margin: 10px 0 14px; }
.reading-course .rc-options, .reading-course .rc-confidence { border: 0; margin: 0; padding: 0; min-width: 0; }
.reading-course .rc-options { display: grid; gap: 8px; }
.reading-course .rc-option { display: grid; grid-template-columns: 15px 16px minmax(0, 1fr); align-items: start; gap: 7px; border: 1px solid var(--rc-border); border-radius: 8px; padding: 11px; font-size: 15px; cursor: pointer; }
.reading-course .rc-option input { width: 15px; height: 15px; margin: 6px 0 0; accent-color: var(--rc-green); }
.reading-course .rc-option b { font-size: 12px; color: var(--rc-muted); margin-top: 3px; }
.reading-course .rc-option.is-selected { background: var(--rc-light); border-color: var(--rc-green); }
.reading-course .rc-confidence { margin-top: 20px; display: flex; flex-wrap: wrap; gap: 12px; color: var(--rc-muted); font-size: 12px; }
.reading-course .rc-confidence legend { margin-bottom: 8px; }
.reading-course .rc-confidence label { display: flex; align-items: center; gap: 4px; cursor: pointer; }
.reading-course .rc-confidence input { accent-color: var(--rc-green); margin: 0; }
.reading-course .rc-submit-area { margin-top: 26px; padding-top: 20px; border-top: 1px solid var(--rc-border); display: flex; gap: 20px; justify-content: space-between; align-items: center; font-size: 12px; color: var(--rc-muted); }
.reading-course .rc-submit-area .rc-button { flex: 0 0 auto; }
.reading-course .rc-result { display: flex; gap: 20px; justify-content: space-between; align-items: center; padding: 18px; background: var(--rc-light); border-radius: 10px; margin-bottom: 14px; }
.reading-course .rc-result h3 { font-size: 23px; }
.reading-course .rc-result p { font-size: 12px; }
.reading-course .rc-result .rc-button { flex: 0 0 auto; }
.reading-course .rc-muted { font-size: 12px; color: var(--rc-muted); }
.reading-course .rc-review-question { padding-top: 25px; margin-top: 24px; border-top: 1px solid var(--rc-border); }
.reading-course .rc-review-heading { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; font-size: 12px; margin-bottom: 10px; }
.reading-course .rc-correct { font-size: 12px; font-weight: 700; color: var(--rc-green); }
.reading-course .rc-incorrect { font-size: 12px; font-weight: 700; color: var(--rc-error); }
.reading-course .rc-review-comparison { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin-top: 18px; }
.reading-course h4 { font-size: 13px; margin-bottom: 8px; }
.reading-course blockquote { border-left: 3px solid #88bbaa; padding-left: 12px; margin: 10px 0; font-size: 16px; }
.reading-course .rc-correct-option { color: #115d4f; background: #e7f4ed; padding: 10px; margin: 8px 0 12px; font-size: 16px; }
.reading-course .rc-review-comparison > section > p:last-child { font-size: 13px; }
.reading-course .rc-distractors { margin-top: 18px; font-size: 13px; }
.reading-course summary { cursor: pointer; color: var(--rc-green); }
.reading-course .rc-distractors > div { padding: 10px 0; }
.reading-course .rc-distractors > div p:first-child { font-size: 15px; }
.reading-course .rc-distractors > div p:last-child { margin-top: 5px; color: var(--rc-muted); }
.reading-course .rc-history { border-top: 1px solid var(--rc-border); padding-top: 18px; margin-top: 28px; font-size: 12px; }
.reading-course .rc-history section { margin-top: 15px; }
.reading-course .rc-history ol { padding-left: 21px; }
.reading-course .rc-history li { padding: 5px 0; }
.reading-course .rc-empty .rc-button { margin-top: 15px; }
.reading-course .rc-visually-hidden { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }
@media (max-width: 980px) {
  .reading-course .rc-catalog { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .reading-course .rc-evidence-layout { grid-template-columns: 1fr; }
  .reading-course .rc-passage { border-right: 0; border-bottom: 1px solid var(--rc-border); padding: 0 0 20px; }
}
@media (max-width: 600px) {
  .reading-course .rc-header { align-items: flex-start; gap: 12px; }
  .reading-course .rc-course-progress { width: 68px; flex-basis: 68px; font-size: 10px; }
  .reading-course .rc-course-progress strong { font-size: 21px; }
  .reading-course h1 { font-size: 23px; }
  .reading-course .rc-header > div:first-child > p:last-child { font-size: 12px; }
  .reading-course .rc-course-card { padding: 10px; gap: 7px; }
  .reading-course .rc-course-number { font-size: 17px; }
  .reading-course .rc-course-description strong { font-size: 12px; }
  .reading-course .rc-course-description > span { display: none; }
  .reading-course .rc-lesson-title { padding: 18px 14px 14px; }
  .reading-course .rc-tabs { padding: 0 8px; }
  .reading-course .rc-tabs .rc-button { font-size: 12px; padding: 11px 3px; }
  .reading-course .rc-learn, .reading-course .rc-practice, .reading-course .rc-review, .reading-course .rc-empty { padding: 18px 13px; }
  .reading-course .rc-worked-example { padding: 14px 10px; }
  .reading-course .rc-practice-heading { display: block; }
  .reading-course .rc-practice-heading > span { display: block; margin-top: 7px; }
  .reading-course .rc-sentence { font-size: 15px; grid-template-columns: 15px minmax(0, 1fr); padding: 8px 5px; gap: 6px; }
  .reading-course .rc-option { padding: 10px 8px; }
  .reading-course .rc-submit-area, .reading-course .rc-result { flex-direction: column; align-items: stretch; gap: 13px; }
  .reading-course .rc-review-comparison { grid-template-columns: 1fr; gap: 12px; }
  .reading-course .rc-question-nav { gap: 5px; }
  .reading-course .rc-question-nav .rc-button { padding: 8px; font-size: 11px; }
}