/* Firebase Full OS 0.58: mobile-first shell overrides. */
@media (max-width: 820px) {
  html,
  body,
  #app {
    width: 100%;
    min-width: 0;
    overflow-x: hidden;
  }

  .app-shell,
  .app-shell:not(.rail-collapsed),
  .app-shell.rail-collapsed {
    height: 100dvh;
    min-height: 100dvh;
    grid-template-rows: auto minmax(0, 1fr);
    overflow: hidden;
  }

  .os-topbar,
  .app-shell:not(.rail-collapsed) .os-topbar,
  .app-shell.rail-collapsed .os-topbar {
    grid-template-columns: 1fr;
    min-height: 0;
    background: var(--surface-strong);
    border-bottom: 1px solid var(--linia);
  }

  .topbar-logo,
  .app-shell:not(.rail-collapsed) .topbar-logo,
  .app-shell.rail-collapsed .topbar-logo,
  .topbar-status {
    display: none;
  }

  .topbar-module {
    display: grid;
    gap: 2px;
    padding: 12px 14px 6px;
  }

  .topbar-module span {
    font-size: 12px;
  }

  .topbar-module b {
    font-size: 22px;
  }

  .os-topbar .top-actions {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 8px;
    padding: 6px 12px 10px;
  }

  .os-topbar .top-actions button {
    width: 100%;
    min-width: 0;
    min-height: 38px;
    padding: 7px 8px;
    font-size: 13px;
    white-space: nowrap;
  }

  .os-body,
  .app-shell:not(.rail-collapsed) .os-body,
  .app-shell.rail-collapsed .os-body {
    height: 100%;
    min-height: 0;
    display: grid;
    grid-template-columns: 1fr;
    grid-template-rows: auto minmax(0, 1fr);
    overflow: hidden;
  }

  .workspace {
    min-width: 0;
    min-height: 0;
    height: 100%;
    overflow: auto;
  }

  #screen,
  .app-shell.rail-collapsed #screen {
    width: 100%;
    min-height: 0;
    padding: 14px 12px 28px;
  }

  .app-rail,
  .app-shell:not(.rail-collapsed) .app-rail,
  .app-shell.rail-collapsed .app-rail {
    position: static;
    z-index: auto;
    inset: auto;
    width: 100%;
    height: auto;
    min-height: 0;
    max-height: none;
    padding: 0 12px;
    border-top: 0;
    border-right: 0;
    border-bottom: 1px solid var(--linia);
    background: var(--surface-strong);
    overflow-x: auto;
    overflow-y: hidden;
  }

  .nav {
    height: auto;
    min-width: max-content;
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 0;
  }

  .nav button,
  .nav button.active,
  .app-shell:not(.rail-collapsed) .nav button,
  .app-shell:not(.rail-collapsed) .nav button.active,
  .app-shell.rail-collapsed .nav button,
  .app-shell.rail-collapsed .nav button.active {
    flex: 0 0 auto;
    width: auto;
    min-width: 0;
    height: 38px;
    min-height: 38px;
    max-height: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 0 12px;
    border: 1px solid var(--linia);
    border-radius: 999px;
    background: transparent;
    color: var(--opis);
    text-align: center;
  }

  .nav button.active,
  .app-shell:not(.rail-collapsed) .nav button.active,
  .app-shell.rail-collapsed .nav button.active {
    border-color: var(--rail-ink);
    background: var(--rail-ink);
    color: var(--papier);
    box-shadow: none;
  }

  .nav button.active::before {
    display: none;
  }

  .nav-code,
  .app-shell:not(.rail-collapsed) .nav-code,
  .app-shell.rail-collapsed .nav-code {
    width: 9px;
    height: 9px;
    flex: 0 0 auto;
    border: 1px solid currentColor;
    background: transparent;
    color: currentColor;
    font-size: 0;
    transform: rotate(45deg);
  }

  .nav-code::before {
    display: none;
  }

  .nav-label,
  .app-shell:not(.rail-collapsed) .nav-label,
  .app-shell.rail-collapsed .nav-label {
    position: static;
    width: auto;
    height: auto;
    overflow: visible;
    clip: auto;
    color: currentColor;
    font-size: 13px;
    font-weight: 850;
    line-height: 1;
  }
}

@media (max-width: 380px) {
  .os-topbar .top-actions {
    gap: 6px;
    padding-left: 10px;
    padding-right: 10px;
  }

  .os-topbar .top-actions button {
    font-size: 12px;
  }

  .app-rail,
  .app-shell:not(.rail-collapsed) .app-rail,
  .app-shell.rail-collapsed .app-rail {
    padding-left: 10px;
    padding-right: 10px;
  }
}