/* Mobile collection, expansion, and popular-product layouts. */
@media (max-width: 900px) {
  .catalog .catalog-intro { gap: 24px; align-items: start; }
  .catalog .catalog-intro h1 { font-size: clamp(38px, 7vw, 56px); line-height: 1.08; }
  .catalog .catalog-intro > p { font-size: 15px; line-height: 1.65; }
  .catalog .catalog-note { font-size: 12px; line-height: 1.65; }
  .catalog .series-nav { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; margin: 26px 0 16px; }
  .catalog .series-nav a { min-height: 66px; padding: 14px; font-size: 12px; gap: 9px; }
  .catalog .series-nav a > span { font-size: 14px; line-height: 1.3; overflow-wrap: anywhere; }
  .catalog .series-nav .popular-link { grid-column: 1 / -1; min-height: 76px; }
  .catalog .popular-link strong { font-size: 17px; }
  .catalog .popular-link small { font-size: 10px; letter-spacing: 1px; }
  .catalog .series-heading { gap: 12px; align-items: end; }
  .catalog .series-heading > div { min-width: 0; }
  .catalog .series-heading h2 { font-size: clamp(23px, 3.4vw, 29px); line-height: 1.15; }
  .catalog .series-heading h2 .english-reference { display: block; font-size: .7em; font-weight: 400; letter-spacing: 0; line-height: 1.45; margin-top: 5px; }
  .catalog .series-heading .eyebrow { font-size: 10px; letter-spacing: 1.2px; }
  .catalog .set-count { font-size: 10px; letter-spacing: 1px; flex: 0 0 auto; }
  .catalog .set-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; }
  .catalog .set-tile { min-width: 0; }
  .catalog .set-info h3 { font-size: 16px; line-height: 1.3; overflow-wrap: anywhere; }
  .catalog .set-info > p { font-size: 12px; }
  .catalog .set-card-count { font-size: 12px; line-height: 1.4; padding-top: 10px; }
  .catalog .set-image { aspect-ratio: 1.7; }
  .catalog .set-logos { padding: 14px; }
  .catalog .set-logos img { max-height: 100px; }
  .catalog .set-logos.dual { padding: 9px; gap: 6px; }
  .catalog .set-logos.dual img { max-height: 48px; }
  .catalog .era-grid { grid-template-columns: 1fr; gap: 18px; }
  .catalog .era-logo { height: 112px; padding: 22px; }
  .catalog .era-logo img { max-height: 70px; max-width: min(100%, 300px); }
  .catalog .era-copy { padding: 20px; }
  .catalog .era-copy h3 { font-size: 24px; }
  .catalog .era-copy > p { font-size: 14px; line-height: 1.6; margin-bottom: 16px; }
  .catalog .era-meta, .catalog .era-set-count { font-size: 11px; }
  .catalog .era-set-list li { font-size: 14px; line-height: 1.5; padding: 10px 0; gap: 12px; }
  .catalog .era-set-list small { font-size: 11px; max-width: 45%; }

  .set-page .set-hero { grid-template-columns: minmax(0, 1fr) 180px; gap: 24px; padding: 28px 0; }
  .set-page .set-hero > div { min-width: 0; }
  .set-page .set-hero h1 { font-size: clamp(34px, 5vw, 48px); line-height: 1.08; letter-spacing: -1.2px; overflow-wrap: anywhere; }
  .set-page .set-hero p { font-size: 15px; line-height: 1.65; }
  .set-page .set-hero-logo { min-height: 112px; padding: 18px; }
  .set-page .product-count { font-size: 12px; line-height: 1.5; }
  .set-page .product-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px; }
  .set-page .format-card { min-width: 0; }
  .set-page .format-photo { aspect-ratio: 1.08; padding: 16px; min-height: 0; }
  .set-page .format-photo img { min-width: 0; max-height: 200px; }
  .set-page .format-copy { padding: 14px; }
  .set-page .format-copy h2 { font-size: 15px; line-height: 1.35; overflow-wrap: anywhere; }
  .set-page .format-copy p, .set-page .format-copy .pc-edition { font-size: 12px; line-height: 1.55; overflow-wrap: anywhere; }
  .set-page .detail-note { font-size: 13px; line-height: 1.7; }

  .popular-page .popular-hero { grid-template-columns: minmax(0, 1fr) 200px; gap: 24px; }
  .popular-page .popular-hero > div { min-width: 0; }
  .popular-page .ranking-stamp, .popular-page .popular-footer-cta > div { min-width: 0; }
  .popular-page .popular-hero h1 { font-size: clamp(38px, 6vw, 54px); line-height: 1.08; }
  .popular-page .popular-hero p { font-size: 15px; line-height: 1.65; }
  .popular-page .ranking-stamp p { font-size: 12px; }
  .popular-page .popular-meta { font-size: 12px; line-height: 1.6; }
  .popular-page .rank-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px; }
  .popular-page .rank-photo { height: 200px; padding: 43px 18px 16px; }
  .popular-page .rank-copy { padding: 14px; }
  .popular-page .rank-copy small { font-size: 11px; line-height: 1.5; }
  .popular-page .rank-copy h2 { font-size: 15px; line-height: 1.4; overflow-wrap: anywhere; }
  .popular-page .popular-footer-cta { padding: 24px; }
  .popular-page .popular-footer-cta p { font-size: 14px; line-height: 1.6; }
  .popular-page .popular-footer-cta .btn { min-height: 44px; font-size: 14px; }
}

@media (max-width: 600px) {
  .catalog .catalog-intro { display: block; }
  .catalog .catalog-intro > p { margin-top: 16px; max-width: none; }
  .catalog .series-block { padding-top: 32px; }
  .catalog .series-heading { margin-bottom: 16px; padding-bottom: 16px; }
  .catalog .series-heading h2 { font-size: clamp(21px, 5.5vw, 26px); letter-spacing: -.5px; }
  .catalog .series-heading .eyebrow { font-size: 9px; }
  .catalog .set-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 11px; }
  .catalog .set-info { padding: 12px; }
  .catalog .set-info h3 { font-size: 15px; }
  .catalog .set-info > p { font-size: 11px; line-height: 1.5; }
  .catalog .set-card-count { font-size: 11px; }
  .catalog .set-image { aspect-ratio: 1.5; }
  .catalog .era-copy { padding: 18px; }

  /* This catalog CTA shares the desktop contact styling, but has no form. */
  .catalog + .section .contact { padding: 22px; gap: 18px; }
  .catalog + .section .contact > div { min-width: 0; }
  .catalog + .section .contact h2 { font-size: clamp(28px, 7.8vw, 34px); line-height: 1.25; overflow-wrap: anywhere; }
  .catalog + .section .contact p { font-size: 14px; line-height: 1.65; }
  .catalog + .section .contact .btn { width: 100%; min-height: 46px; padding: 12px 18px; font-size: 14px; gap: 16px; justify-content: center; white-space: normal; }

  .set-page .set-hero { grid-template-columns: 1fr; gap: 18px; padding: 22px 0 24px; margin-bottom: 23px; }
  .set-page .set-hero-logo { order: -1; width: 100%; max-width: 240px; min-height: 108px; align-self: start; }
  .set-page .set-hero-logo img { max-height: 84px; }
  .set-page .set-hero h1 { font-size: clamp(32px, 8.5vw, 44px); margin: 12px 0; }
  .set-page .set-hero .eyebrow { font-size: 11px; letter-spacing: 1.4px; }
  .set-page .product-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 11px; }
  .set-page .format-photo { aspect-ratio: 1; padding: 12px; }
  .set-page .format-copy { padding: 12px; }
  .set-page .format-copy h2 { font-size: 14px; line-height: 1.4; }
  .set-page .format-copy p, .set-page .format-copy .pc-edition { font-size: 12px; line-height: 1.5; }

  .popular-page .popular-hero { grid-template-columns: 1fr; gap: 20px; padding: 12px 0 24px; }
  .popular-page .popular-hero h1 { font-size: clamp(36px, 9vw, 46px); }
  /* Let the rank headline and translated copy grow independently. */
  .popular-page .ranking-stamp { display: flex; flex-direction: column; align-items: flex-start; gap: 5px; padding: 20px; }
  .popular-page .ranking-stamp small { font-size: 10px; line-height: 1.5; letter-spacing: 1px; }
  .popular-page .ranking-stamp b { min-width: 0; margin: 0; font-size: 32px; line-height: 1.2; letter-spacing: -1px; overflow-wrap: anywhere; }
  .popular-page .popular-meta { display: block; }
  .popular-page .rank-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 11px; }
  .popular-page .rank-photo { height: 180px; padding: 42px 13px 15px; }
  .popular-page .rank-copy { padding: 12px; }
  .popular-page .rank-copy h2 { font-size: 14px; }
  .popular-page .rank-copy small { font-size: 11px; }
  .popular-page .popular-footer-cta { flex-direction: column; align-items: stretch; gap: 18px; padding: 22px; }
  .popular-page .popular-footer-cta .btn { justify-content: center; white-space: normal; }
}

@media (max-width: 359px) {
  .catalog .series-nav a { padding: 12px 10px; gap: 7px; }
  .catalog .series-nav a > span { font-size: 13px; }
  .catalog .series-heading { flex-wrap: wrap; align-items: start; gap: 8px; }
  .catalog .set-count { margin-left: 0; }
  .catalog .set-info { padding: 10px; }
  .catalog .set-info h3 { font-size: 14px; }
  .catalog .era-set-list li { font-size: 13px; gap: 9px; }
  .catalog .era-set-list small { font-size: 10px; }
  .set-page .product-grid, .popular-page .rank-grid { grid-template-columns: 1fr; }
  .set-page .format-photo { aspect-ratio: 1.55; }
  .set-page .format-copy h2, .popular-page .rank-copy h2 { font-size: 16px; }
  .set-page .format-copy p, .set-page .format-copy .pc-edition { font-size: 13px; }
  .popular-page .rank-photo { height: 205px; }
}

@media (hover: none) {
  .catalog .set-tile:hover { transform: none; }
}