#mobile-menu-toggle { display: none; }

/* Keep export reachable when navigation and reading cards exceed the screen. */
@media (min-width: 821px) {
  .left-rail {
    position: sticky !important;
    top: 10px !important;
    height: calc(100vh - 20px) !important;
    height: calc(100dvh - 20px) !important;
    min-height: 0;
    overflow: hidden !important;
  }
  .left-rail > .rail-scroll {
    display: flex;
    flex-direction: column;
    flex: 1 1 0;
    gap: 10px;
    min-width: 0;
    min-height: 0;
    overflow-x: hidden;
    overflow-y: auto;
    overscroll-behavior: contain;
    scrollbar-width: thin;
    scrollbar-color: #ad85e76b transparent;
    scrollbar-gutter: stable;
    padding-right: 3px;
  }
  .left-rail > .rail-scroll > * { flex-shrink: 0; }
  .left-rail > .rail-actions {
    flex: 0 0 auto;
    margin-top: 0;
    padding-top: 10px;
    border-top: 1px solid #b395e52e;
  }
  .left-rail #export-btn {
    width: 100%;
    min-height: 44px !important;
    font-size: 12px !important;
  }
}

@media (max-width: 820px) {
  .left-rail > .rail-scroll { display: contents; }
  .left-rail {
    display: grid !important;
    grid-template-columns: minmax(0, 1fr) auto !important;
    align-items: center !important;
    gap: 8px !important;
    top: max(5px, env(safe-area-inset-top)) !important;
  }
  .left-rail .logo-card {
    grid-column: 1;
    grid-row: 1;
    min-width: 0;
  }
  .left-rail .logo-row { min-width: 0; }
  .left-rail .logo-card h1 { font-size: clamp(11px, 3.4vw, 14px) !important; }
  #mobile-menu-toggle {
    grid-column: 2;
    grid-row: 1;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 7px;
    min-height: 44px;
    min-width: 92px;
    padding: 9px 11px;
    border: 1px solid #ad85e77a;
    border-radius: 12px;
    background: #49336580;
    color: #f1e5ff;
    font-size: 13px;
    font-weight: 700;
    cursor: pointer;
  }
  #mobile-menu-toggle svg { width: 19px; height: 19px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; }
  #mobile-menu-toggle[aria-expanded="true"] { border-color: #d2b0ff; background: #624587aa; }
  #mobile-menu-toggle:focus-visible, .left-rail .nav button:focus-visible { outline: 2px solid #d2b0ff; outline-offset: 2px; }
  .left-rail .rail-actions {
    grid-column: 1 / -1;
    grid-row: 2;
    justify-content: flex-end !important;
  }
  .left-rail .rail-actions button { min-height: 36px !important; font-size: 10px !important; }
  .left-rail .nav[data-mobile-open="true"] {
    display: grid !important;
    grid-column: 1 / -1;
    grid-row: 3;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 6px !important;
    margin: 0 !important;
    padding: 6px 2px 9px;
    border-top: 1px solid #b395e52e;
    max-height: calc(100vh - 180px);
    max-height: calc(100dvh - 180px);
    overflow-y: auto;
    overscroll-behavior: contain;
    -webkit-overflow-scrolling: touch;
  }
  .left-rail .nav button {
    min-width: 0;
    min-height: 48px !important;
    padding: 9px 8px !important;
    font-size: 12px !important;
    line-height: 1.3;
    white-space: normal;
    text-align: left;
  }
  .left-rail .nav .ico { flex-shrink: 0; }
}