/* Mobile-first refinements for comfortable navigation and touch controls. */
@media (max-width: 760px) {
  .topbar {
    height: auto;
    min-height: 64px;
    padding: 7px 16px 0;
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    column-gap: 10px;
    row-gap: 2px;
  }

  .topbar .brand {
    min-width: 0;
    white-space: nowrap;
  }

  .member-tools {
    grid-column: 2;
    grid-row: 1;
    min-width: 0;
  }

  .member-tools > span {
    max-width: 120px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  .member-tools .top-link {
    min-height: 44px;
    padding: 7px 11px;
  }

  .topbar nav {
    grid-column: 1 / -1;
    grid-row: 2;
    width: 100%;
    gap: 4px;
    overflow-x: auto;
    overscroll-behavior-inline: contain;
    scrollbar-width: none;
    padding: 0 0 5px;
  }

  .topbar nav::-webkit-scrollbar {
    display: none;
  }

  .topbar nav a {
    display: flex;
    align-items: center;
    flex: 0 0 auto;
    min-height: 44px;
    padding: 0 10px;
    font-size: 13px;
    white-space: nowrap;
  }

  .lesson-button {
    min-height: 44px;
    padding: 10px 0 0;
  }

  .video-controls button {
    min-width: 44px;
    min-height: 44px;
    padding: 0 6px;
  }

  .video-controls input[type="range"] {
    min-width: 36px;
    min-height: 32px;
  }

  /* Larger type for comfortable reading on phones. */
  .topbar .brand {
    font-size: 17px;
  }

  .member-tools {
    font-size: 11px;
  }

  .member-tools .top-link {
    font-size: 11px;
  }

  .topbar nav a {
    font-size: 15px;
  }

  .eyebrow {
    font-size: 10px;
    letter-spacing: 1.7px;
  }

  .hero-text {
    font-size: 15px;
    line-height: 1.65;
  }

  .hero-art {
    opacity: .3;
  }

  .hero-note {
    font-size: 12px;
  }

  .hero-bottom {
    font-size: 9px;
  }

  .welcome > p {
    font-size: 14px;
    line-height: 1.7;
  }

  .welcome h2,
  .section-heading h2 {
    font-size: 33px;
  }

  .beginner-expand {
    min-height: 44px;
    font-size: 12px;
  }

  .course-progress {
    max-width: 140px;
    font-size: 12px;
  }

  .lesson-tag {
    font-size: 9px;
    letter-spacing: .6px;
  }

  .lesson-number {
    font-size: 10px;
    letter-spacing: 1px;
  }

  .lesson-info h3 {
    font-size: 16px;
  }

  .lesson-info p {
    font-size: 13px;
    line-height: 1.45;
  }

  .progress-label {
    font-size: 11px;
  }

  .lesson-button {
    font-size: 13px;
  }

  .lesson-footnote {
    font-size: 12px;
  }

  .certificate-card p:not(.eyebrow) {
    font-size: 13px;
  }

  .file-count {
    font-size: 11px;
  }

  .pdf-group-heading p,
  .subheading {
    font-size: 13px;
    line-height: 1.5;
  }

  .file-meta strong {
    font-size: 12px;
  }

  .file-meta small {
    font-size: 10px;
  }

  .search-box {
    min-height: 44px;
  }

  .search-box input {
    font-size: 14px;
  }

  .filter {
    min-height: 44px;
    font-size: 12px;
  }

  .button {
    min-height: 44px;
    font-size: 14px;
  }

  .shop-copy p {
    font-size: 13px;
    line-height: 1.5;
  }

  .shop-category,
  .shop-note {
    font-size: 11px;
  }

  .closing p {
    font-size: 22px;
  }

  footer > span {
    font-size: 10px;
  }

  .pdf-viewer-header h2 {
    font-size: 16px;
  }

  .pdf-viewer-header .button {
    font-size: 12px;
  }

  .video-controls button {
    font-size: 12px;
  }

  .video-controls {
    display: grid;
    grid-template-columns: 44px 44px minmax(50px, 1fr) 44px 44px;
    grid-template-rows: 44px 28px;
    gap: 3px;
    padding: 8px 10px 3px;
  }

  #video-play { grid-column: 1; grid-row: 1; }
  #seek-back { grid-column: 2; grid-row: 1; }
  #video-time { grid-column: 3; grid-row: 1; justify-self: center; }
  #seek-forward { grid-column: 4; grid-row: 1; }
  #video-fullscreen { grid-column: 5; grid-row: 1; }

  .video-controls input[type="range"] {
    grid-column: 1 / -1;
    grid-row: 2;
    width: 100%;
    min-width: 0;
  }

  .video-controls span {
    font-size: 10px;
  }

  .video-save-note {
    font-size: 11px;
  }
}

.video-dialog:fullscreen {
  width: 100vw;
  height: 100vh;
  height: 100dvh;
  max-width: none;
  max-height: none;
  margin: 0;
  padding: 8px 0 12px;
  border: 0;
  border-radius: 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
  overflow: auto;
}

.video-dialog:fullscreen .video-frame {
  width: 100%;
  max-height: calc(100dvh - 105px);
  flex: 0 1 auto;
}

.video-dialog:fullscreen .close-dialog {
  position: fixed;
  top: 10px;
  right: 12px;
}

@media (max-width: 390px) {
  .topbar {
    padding-right: 12px;
    padding-left: 12px;
    column-gap: 6px;
  }

  .member-tools {
    gap: 4px;
  }

  .member-tools > span {
    max-width: 88px;
  }

  .topbar nav {
    gap: 0;
  }

  .topbar nav a {
    padding-right: 8px;
    padding-left: 8px;
  }
}