/* Keep the mobile shell at the same breakpoint as the existing sidebar. */
.os-mobile-menu:not([open]) { display: none; }

@media (max-width: 980px) {
  body.os-mobile-menu-open { overflow: hidden; }

  body.foundergps-mode:not(.logged-out):not(.public-diagnosis-mode) #appShell > main {
    padding-bottom: calc(80px + env(safe-area-inset-bottom, 0px));
  }

  body.foundergps-mode:not(.logged-out):not(.public-diagnosis-mode) #view {
    padding-bottom: 24px;
  }

  body.foundergps-mode #mobileNav {
    position: fixed;
    inset: auto 0 0;
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    grid-template-rows: 63px;
    gap: 0;
    height: calc(64px + env(safe-area-inset-bottom, 0px));
    padding: 0 env(safe-area-inset-right, 0px) env(safe-area-inset-bottom, 0px) env(safe-area-inset-left, 0px);
    box-sizing: border-box;
    overflow: hidden;
    border-top: 1px solid var(--os-border);
    background: #101315;
    backdrop-filter: none;
    box-shadow: none;
    z-index: 20;
  }

  body.foundergps-mode #mobileNav .nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 4px;
    width: 100%;
    min-width: 0;
    height: 63px;
    min-height: 0;
    margin: 0;
    padding: 5px 2px;
    border: 0;
    border-radius: 0;
    color: #b0b8b6;
    background: transparent;
    box-shadow: none;
    font-size: 12px;
    font-weight: 500;
    line-height: 16px;
    letter-spacing: 0;
    white-space: nowrap;
    transform: none;
  }

  body.foundergps-mode #mobileNav .nav-item.active,
  body.foundergps-mode #mobileNav .nav-item[aria-expanded="true"] {
    color: var(--os-green);
    background: #191d20;
    box-shadow: inset 0 2px var(--os-green);
  }

  body.foundergps-mode #mobileNav .nav-icon,
  body.foundergps-mode #mobileNav .nav-icon svg {
    width: 22px;
    height: 22px;
    flex: 0 0 22px;
  }

  body.foundergps-mode #mobileNav .nav-item:focus-visible {
    outline: 2px solid var(--os-orange);
    outline-offset: -4px;
  }

  .os-mobile-menu {
    position: fixed;
    inset: auto 0 0;
    width: min(100%, 560px);
    max-width: 100%;
    max-height: 70vh;
    max-height: 70dvh;
    margin: 0 auto;
    padding: 0 16px calc(16px + env(safe-area-inset-bottom, 0px));
    box-sizing: border-box;
    overflow-y: auto;
    overscroll-behavior: contain;
    border: 1px solid var(--os-border);
    border-bottom: 0;
    border-radius: 8px 8px 0 0;
    background: #191d20;
    color: var(--os-text);
    color-scheme: dark;
    letter-spacing: 0;
  }

  .os-mobile-menu::backdrop { background: rgb(0 0 0 / 65%); }

  .os-mobile-menu-header {
    position: sticky;
    top: 0;
    z-index: 1;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 16px 0;
    border-bottom: 1px solid var(--os-border);
    background: #191d20;
  }

  .os-mobile-menu-header > div { min-width: 0; }
  .os-mobile-menu-header p { margin: 0 0 4px; color: var(--os-orange); font-size: 12px; overflow-wrap: anywhere; }
  .os-mobile-menu-header h2 { margin: 0; font-size: 20px; line-height: 1.3; letter-spacing: 0; }
  .os-mobile-menu-close {
    display: grid;
    place-items: center;
    flex: 0 0 44px;
    width: 44px;
    height: 44px;
    padding: 0;
    border: 1px solid var(--os-border);
    border-radius: 4px;
    background: transparent;
    color: var(--os-text);
    font-size: 28px;
    cursor: pointer;
  }

  .os-mobile-menu-group { padding: 8px 0; }
  .os-mobile-menu-group + .os-mobile-menu-group { border-top: 1px solid var(--os-border); }
  .os-mobile-menu-group h3 { margin: 12px 10px 8px; font-size: 12px; font-weight: 500; color: var(--os-muted); letter-spacing: 0; overflow-wrap: anywhere; }
  body.foundergps-mode .os-mobile-menu .nav-item {
    display: flex;
    align-items: center;
    width: 100%;
    min-height: 48px;
    padding: 12px 10px;
    border: 0;
    border-bottom: 1px solid #292e30;
    border-radius: 0;
    gap: 12px;
    background: transparent;
    color: var(--os-text);
    font-size: 14px;
    text-align: left;
    letter-spacing: 0;
    white-space: normal;
    overflow-wrap: anywhere;
  }
  .os-mobile-menu .nav-icon { flex: 0 0 20px; width: 20px; height: 20px; }
  .os-mobile-menu .nav-icon svg { width: 20px; height: 20px; }
  body.foundergps-mode .os-mobile-menu .nav-item.active { color: var(--os-green); box-shadow: inset 2px 0 var(--os-green); }
  body.foundergps-mode .os-mobile-menu .nav-item:hover { background: #252a2d; }
  body.foundergps-mode .os-mobile-menu .nav-item:focus-visible { outline-offset: -2px; }
}