.mobile-recorded-nav {
  display: none;
}

@media (max-width: 700px) {
  .recorded-course-shell > header {
    padding: 12px 14px;
  }

  .recorded-course-shell > header .brand-logo {
    width: 34px;
    height: 34px;
  }

  .recorded-course-shell > header .back-button {
    min-height: 38px;
    padding: 8px 10px;
    font-size: 12px;
  }

  .recorded-course-heading,
  .recorded-workspace {
    width: calc(100% - 28px);
  }

  .recorded-course-heading {
    margin: 18px auto 12px;
    gap: 6px;
  }

  .recorded-course-heading h1 {
    margin: 3px 0;
    font-size: 30px;
  }

  .recorded-course-heading > div:last-child strong {
    font-size: 19px;
  }

  .recorded-workspace {
    display: block;
    margin-bottom: 42px;
  }

  .recorded-catalog {
    display: none;
  }

  .mobile-recorded-nav {
    display: block;
    border: 1px solid var(--line);
    background: #fff;
    margin-bottom: 10px;
    overflow: hidden;
  }

  .mobile-recorded-nav-group {
    padding: 10px 11px;
  }

  .mobile-recorded-nav-group + .mobile-recorded-nav-group {
    border-top: 1px solid var(--line);
  }

  .mobile-recorded-nav-label {
    display: block;
    margin-bottom: 7px;
    color: var(--muted);
    font-size: 10px;
    font-weight: 750;
    letter-spacing: .08em;
  }

  .mobile-recorded-nav-scroll {
    display: flex;
    gap: 7px;
    overflow-x: auto;
    padding: 1px 1px 4px;
    scrollbar-width: none;
  }

  .mobile-recorded-nav-scroll::-webkit-scrollbar {
    display: none;
  }

  .mobile-recorded-nav button {
    flex: 0 0 auto;
    min-height: 38px;
    border: 1px solid var(--line);
    background: #fff;
    color: var(--ink);
    padding: 8px 11px;
    text-align: left;
    font-size: 12px;
  }

  .mobile-recorded-nav button.active {
    border-color: var(--blue);
    background: #e7edf4;
    color: var(--blue);
    font-weight: 800;
  }

  .recorded-title {
    align-items: flex-start;
    gap: 8px;
    padding: 13px 14px;
  }

  .recorded-title h2 {
    margin-top: 3px;
    font-size: 20px;
    line-height: 1.35;
  }

  .recorded-title > span {
    padding: 5px 8px;
    font-size: 10px;
  }

  .recorded-textbook-location {
    margin: 0;
    padding: 10px 13px;
    border: 1px solid var(--line);
    border-top: 0;
    background: #fff;
    color: var(--blue);
    font-size: 12px;
  }

  .recorded-quick-actions {
    overflow-x: auto;
    white-space: nowrap;
  }

  .recorded-video-list {
    display: flex;
    gap: 8px;
    overflow-x: auto;
    margin: 10px 0;
    padding: 2px 1px 5px;
    scroll-snap-type: x proximity;
    scrollbar-width: none;
  }

  .recorded-video-list::-webkit-scrollbar {
    display: none;
  }

  .recorded-video-list button {
    flex: 0 0 auto;
    grid-template-columns: 26px minmax(0, 1fr);
    width: auto;
    min-width: 142px;
    max-width: 230px;
    min-height: 50px;
    padding: 8px 10px;
    scroll-snap-align: start;
  }

  .recorded-video-list i {
    width: 25px;
    height: 25px;
  }

  .recorded-video-list strong {
    font-size: 13px;
    line-height: 1.35;
  }

  .recorded-video-list small {
    font-size: 10px;
  }

  .recorded-main > .protected-video-stage {
    width: calc(100% + 28px);
    max-width: none;
    margin-right: -14px;
    margin-left: -14px;
    box-shadow: none;
  }

  .recorded-main > .protected-video-stage .course-video {
    display: block;
    width: 100%;
    max-width: none;
    height: auto;
    min-height: 0;
    aspect-ratio: 16 / 9;
    object-fit: contain;
  }

  .recorded-handout-card {
    margin-top: 14px;
    padding: 16px 14px;
    gap: 12px;
  }

  .recorded-handout-card h3 {
    font-size: 17px;
  }

  .recorded-material-button {
    min-height: 42px;
  }

  .recorded-reading,
  .recorded-quiz,
  .recorded-question-box,
  .student-question-history {
    margin-top: 14px;
    padding: 16px 14px;
  }

  .recorded-quiz h3,
  .recorded-reading h3,
  .recorded-question-box h3 {
    font-size: 18px;
    line-height: 1.45;
  }

  .recorded-quiz fieldset,
  .recorded-subjective-question {
    padding: 13px 11px;
  }
}