/**
 * L13 Page 04 · 大屏可读字号
 */
#l13-book {
  --l13-fs-en: clamp(0.95rem, 1.35vw + 0.55rem, 1.22rem);
  --l13-fs-zh: clamp(0.82rem, 0.95vw + 0.42rem, 0.98rem);
  --l13-fs-quiz-stem: clamp(0.88rem, 1.15vw + 0.48rem, 1.08rem);
  --l13-fs-quiz-opt: clamp(0.8rem, 1vw + 0.4rem, 0.95rem);
}

#l13-book .page-title {
  font-size: clamp(1.05rem, 1.7vw + 0.52rem, 1.32rem);
}

#l13-book .lesson-page[data-page="2"] .en-line,
#l13-book .lesson-page[data-page="3"] .en-line {
  font-size: var(--l13-fs-en) !important;
}

#l13-book .lesson-page[data-page="4"] .story-passage {
  font-size: clamp(0.88rem, 1.2vw + 0.45rem, 1.08rem);
}

#l13-book .lesson-page[data-page="6"] .quiz-stem {
  font-size: clamp(0.92rem, 1.75vh + 0.42rem, 1.18rem) !important;
  line-height: 1.38 !important;
}

#l13-book .lesson-page[data-page="6"] .opt-row button {
  font-size: clamp(0.8rem, 1.25vh + 0.35rem, 0.98rem) !important;
  min-height: clamp(38px, 5.5vh, 50px) !important;
  padding: clamp(0.28rem, 0.65vh, 0.45rem) clamp(0.45rem, 1vw, 0.7rem) !important;
}