/* R35: member-facing mobile polish. Desktop and admin keep their own layouts. */
@media (max-width: 900px) {
  body:not(.admin-page) .navbar {
    --member-nav-height: 64px;
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
    background: transparent;
  }
  body:not(.admin-page) .navbar::before { content: ''; position: absolute; inset: 0; z-index: -1; background: rgba(1, 5, 68, .88); backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px); pointer-events: none; }
  body:not(.admin-page) .navbar.scrolled::before { background: rgba(1, 5, 68, .92); backdrop-filter: blur(24px) saturate(1.4); -webkit-backdrop-filter: blur(24px) saturate(1.4); }
  body:not(.admin-page) .nav-container {
    min-height: 64px;
    padding: max(8px, env(safe-area-inset-top)) max(18px, env(safe-area-inset-right)) 8px max(18px, env(safe-area-inset-left));
    gap: 16px;
  }
  body:not(.admin-page) .navbar .logo { min-height: 44px; min-width: 44px; }
  body:not(.admin-page) .menu-toggle { min-width: 44px; min-height: 44px; justify-content: center; align-items: center; }
  body:not(.admin-page) .nav-menu {
    background: rgba(1, 5, 68, .58);
    backdrop-filter: blur(12px) saturate(1.1);
    -webkit-backdrop-filter: blur(12px) saturate(1.1);
    border-bottom: 1px solid rgba(255, 255, 255, .16);
    box-shadow: 0 12px 28px rgba(1, 5, 68, .16);
    max-height: calc(100vh - var(--member-nav-height));
    max-height: calc(100dvh - var(--member-nav-height));
    padding: 12px 18px max(18px, env(safe-area-inset-bottom));
    overscroll-behavior: contain;
    visibility: hidden;
    pointer-events: none;
    transition: transform .22s ease, visibility .22s;
  }
  body:not(.admin-page) .nav-menu.open { visibility: visible; pointer-events: auto; }
  body:not(.admin-page) .nav-menu .nav-link {
    color: rgba(255, 255, 255, .94);
    min-height: 44px;
    display: flex;
    align-items: center;
    font-size: 15px;
  }
  body:not(.admin-page) .nav-menu .nav-link:is(:hover, .active) { color: #fff; background: rgba(255, 255, 255, .07); }
  body:not(.admin-page) .nav-menu .btn-primary { background: rgba(255, 255, 255, .12); border: 1px solid rgba(255, 255, 255, .35); box-shadow: none; }
  body:not(.admin-page) .nav-menu .lang-trigger { width: 44px; height: 44px; }
  body:not(.admin-page) .navbar :is(a, button):focus-visible { outline: 2px solid #b9ddf8; outline-offset: 3px; }
  @supports not ((backdrop-filter: blur(12px)) or (-webkit-backdrop-filter: blur(12px))) {
    body:not(.admin-page) .nav-menu { background: rgba(1, 5, 68, .94); }
  }
}

@media (max-width: 760px) {
  body:not(.admin-page) { -webkit-text-size-adjust: 100%; }
  body:not(.admin-page) .sub-hero {
    min-height: 0;
    padding: 96px 18px 32px;
  }
  body:not(.admin-page) .sub-hero .hero-title {
    font-size: clamp(28px, 7.7vw, 34px);
    line-height: 1.35;
    margin-bottom: 18px;
    overflow-wrap: anywhere;
  }
  body:not(.admin-page) .sub-hero .hero-subtitle { font-size: 15px; font-weight: 400; line-height: 1.8; margin-top: 16px; }
  body:not(.admin-page) .breadcrumb { flex-wrap: wrap; gap: 8px; font-size: 13px; line-height: 1.6; margin-bottom: 18px; }
  body:not(.admin-page) .breadcrumb a { min-height: 32px; display: inline-flex; align-items: center; }
  body:not(.admin-page) :is(.filter-btn, .pf-nav-item, .pf-edit-btn, .mat-detail-back, .mat-show-more) { min-height: 44px; }
  body:not(.admin-page) :is(input:not([type=checkbox]):not([type=radio]):not([type=range]), select, textarea) { font-size: 16px; }
  body:not(.admin-page) :is(.filter-tabs, .module-filters) { gap: 8px; flex-wrap: wrap; }
  body:not(.admin-page) .notice-side-link { display: inline-flex; min-height: 44px; align-items: center; }
  body:not(.admin-page) .module-content { overflow-wrap: anywhere; }
  body:not(.admin-page) .module-content :is(pre, .katex-display) { max-width: 100%; overflow-x: auto; }
  .home-page .dl-row-desc { -webkit-line-clamp: 2; line-height: 1.75; }
  .materials-page .mat-file-sort select { min-height: 44px; }
  .profile-page .pf-layout { grid-template-columns: minmax(0, 1fr); }
  .profile-page .pf-side { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .profile-page :is(.pf-content, .pf-side, .pf-nav-item, .pf-field-body) { min-width: 0; }
  .profile-page .pf-nav-item { text-align: center; line-height: 1.5; }
  .profile-page .pf-field { flex-wrap: wrap; gap: 10px; }
  .profile-page .pf-field-body { flex-basis: 55%; overflow-wrap: anywhere; }
  .profile-page .pf-edit-state-locked { max-width: 100%; white-space: normal; }

  /* The board ends at the contact divider, following the navigation row's height. */
  body:not(.admin-page) .footer { padding: 32px 0 max(20px, env(safe-area-inset-bottom)); isolation: isolate; }
  body:not(.admin-page) .footer-grid::before {
    content: '';
    position: absolute;
    grid-column: 1 / -1;
    grid-row: 1 / 2;
    inset: -32px -18px -24px;
    z-index: -1;
    background: url('../images/hero-math-blackboard-v1-1024w.webp') 56% center / auto 100% no-repeat;
    opacity: .24;
    filter: brightness(1.25);
    mix-blend-mode: screen;
    -webkit-mask-image: linear-gradient(to bottom, #000 0%, #000 65%, transparent 100%);
    mask-image: linear-gradient(to bottom, #000 0%, #000 65%, transparent 100%);
    pointer-events: none;
  }
  body:not(.admin-page) .footer-illo { display: none; }
  body:not(.admin-page) .footer > .container { position: relative; z-index: 1; }
  body:not(.admin-page) .footer-grid { position: relative; isolation: isolate; grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr); gap: 24px 20px; padding-left: 0; margin-bottom: 24px; }
  body:not(.admin-page) .footer-col:not(.footer-brand) { display: flex; flex-direction: column; align-items: flex-start; gap: 0; padding-top: 0; min-width: 0; }
  body:not(.admin-page) .footer-col h5 { font-size: 14px; line-height: 1.5; margin: 0 0 10px; }
  body:not(.admin-page) .footer-col a { min-height: 42px; padding: 8px 0; font-size: 14px; line-height: 1.6; color: #dde4f6; overflow-wrap: anywhere; }
  body:not(.admin-page) .footer-brand {
    grid-column: 1 / -1;
    display: grid;
    grid-template-columns: minmax(0, 1fr) 72px;
    gap: 0 14px;
    align-items: center;
    border-top: 1px solid rgba(255,255,255,.14);
    padding-top: 20px;
  }
  body:not(.admin-page) .footer-brand :is(h5, a, p) { grid-column: 1; }
  body:not(.admin-page) .footer-brand h5 { margin-bottom: 0; }
  body:not(.admin-page) .footer-brand p { font-size: 13px; line-height: 1.7; margin: 0; color: #c7d2ed; }
  body:not(.admin-page) .footer-brand .logo--full { grid-column: 2; grid-row: 1 / 4; margin: 0; }
  body:not(.admin-page) .footer-brand .logo-img--full { height: auto; width: 72px; }
  body:not(.admin-page) .footer-bottom { padding-top: 18px; font-size: 12px; line-height: 1.8; color: #b5c2e2; }
  body:not(.admin-page) .footer a:focus-visible { outline: 2px solid #b9ddf8; outline-offset: 3px; }
  body:not(.admin-page) .footer-min { padding-block: 24px; }
}

@media (max-width: 900px) and (prefers-reduced-motion: reduce) {
  body:not(.admin-page) .nav-menu { transition: none; }
}