/* 320–767：课程柜变为顶部木质标签，正文自然单列。 */
@media (max-width: 767px) {
  .site-header { grid-template-columns: 1fr auto; min-height: 64px; padding: 0 14px; }
  .brand__name { font-size: 1.35rem; }
  .top-navigation { grid-column: 1 / -1; order: 3; width: calc(100% + 28px); margin: 0 -14px; justify-content: space-around; border-top: 1px solid var(--line); }
  .top-navigation__link { min-width: 48px; min-height: 46px; font-size: .82rem; }
  .parent-center { grid-column: 2; grid-row: 1; padding: 0 10px; font-size: .76rem; }
  .home-workspace { min-height: 0; }
  .course-cabinet { min-height: 148px; padding-bottom: 14px; border-right: 0; border-bottom: 8px solid #2b180d; }
  .course-cabinet__title { width: 160px; }
  .course-drawer { width: min(330px, calc(100% - 4px)); min-height: 78px; }
  .cabinet-thumbnail { width: 56px; height: 58px; }
  .course-cabinet__note { display: none; }
  .curriculum-hero { min-height: 220px; padding: 22px; }
  .curriculum-hero__copy { max-width: 78%; }
  .curriculum-hero img { width: 74%; opacity: .55; }
  .continue-card { grid-template-columns: 100px 1fr; gap: 12px; }
  .continue-card > img { height: 105px; }
  .lesson-mode-tabs { grid-template-columns: repeat(5, minmax(72px, 1fr)); }
  .mode-tab { padding-right: 8px; padding-left: 8px; font-size: .8rem; }
  .study-card__heading { align-items: flex-start; flex-direction: column; }
  .lesson-utilities { gap: 8px; font-size: .78rem; }
  .lesson-topbar { grid-template-columns: auto 1fr auto; }
  .lesson-topbar > strong { text-align: center; }
  .exercise-intro { align-items: flex-start; padding: 22px 18px; }
  .exercise-score { width: 72px; height: 72px; padding-top: 18px; }
  .exercise-score strong { font-size: 1.8rem; }
  .character-lookup-card__head { grid-template-columns: auto minmax(0, 1fr); }
  .character-audio-button { grid-column: 1 / -1; width: 100%; }
  .character-explanation-grid { grid-template-columns: 1fr; }
  .character-explanation-grid__line, .character-explanation-grid__note { grid-column: auto; }
  .reading-recorder__heading { align-items: flex-start; flex-direction: column; }
  .reading-recorder__active { grid-template-columns: auto 1fr auto; }
  .reading-recorder__active .primary-button { grid-column: 1 / -1; width: 100%; }
  .access-page, .activation-page { min-height: calc(100vh - 110px); padding: 18px 12px; }
  .access-dialog { max-width: calc(100% - 24px); padding: 22px 18px; }
  .access-dialog__actions { display: grid; grid-template-columns: 1fr; }
  .access-dialog__actions .primary-button { order: -1; }
  .activation-panel { padding: 24px 18px; overflow-wrap: anywhere; }
  .access-panel__actions > * { width: 100%; }
  .lesson-card { max-width: 100%; }
}

@media (max-width: 359px) {
  .reading-sheet { padding-right: 8px; padding-left: 8px; }
  .poem-character { min-width: 36px; }
}

@media (min-width: 768px) {
  .home-workspace { grid-template-columns: 230px minmax(0, 1fr); }
  .paper-dashboard { padding: 24px 24px 0; }
  .lesson-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .continue-card { grid-template-columns: 180px minmax(0, 1fr) auto; padding: 12px; }
  .continue-card .primary-button { grid-column: auto; min-width: 120px; }
  .reading-sheet { padding: 24px; }
  .lesson-mode-tabs { grid-template-columns: repeat(5, minmax(104px, 1fr)); }
  .meaning-card__content { grid-template-columns: .7fr 1.3fr; align-items: start; }
  .order-options { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .exercise-tip { grid-template-columns: auto 1fr auto; }
  .exercise-tip .text-link-button { grid-column: auto; }
}

@media (min-width: 1024px) {
  .home-workspace { grid-template-columns: 260px minmax(0, 1fr); }
  .paper-dashboard { padding: 28px 28px 0; }
  .lesson-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .curriculum-hero { min-height: 250px; padding: 36px; }
  .continue-card > img { height: 142px; }
  .lesson-page { padding-right: 24px; padding-left: 24px; }
  .lesson-layout { grid-template-columns: minmax(340px, .96fr) minmax(520px, 1.04fr); }
  .reading-sheet { grid-template-columns: minmax(340px, .96fr) minmax(520px, 1.04fr); align-items: center; gap: 34px; }
  .lesson-visual__frame { max-width: 470px; }
  .poem-line { justify-content: center; }
}

@media (min-width: 1280px) {
  .site-header { min-height: 80px; padding: 0 34px; }
  .home-workspace { min-height: calc(100vh - 80px); grid-template-columns: 272px minmax(0, 1fr); }
  .course-cabinet { padding: 20px 18px 28px; }
  .paper-dashboard { padding: 36px 34px 0; }
  .curriculum-hero { min-height: 290px; }
  .continue-panel, .course-section { padding: 18px 20px; }
  .continue-card { grid-template-columns: 190px minmax(0, 1fr) 138px; }
  .lesson-page { padding-right: 34px; padding-left: 34px; }
  .reading-sheet { grid-template-columns: minmax(410px, .9fr) minmax(610px, 1.1fr); padding: 32px; }
  .lesson-visual__frame { max-width: 500px; }
  .poem-card h1 { font-size: 4.3rem; }
  .token-character, .poem-punctuation { font-size: 2.15rem; }
}