#appShell {
  display: grid;
  grid-template-areas:
    "topbar topbar"
    "nav main";
  grid-template-columns: var(--nav-width) minmax(0, 1fr);
  grid-template-rows: var(--topbar-height) minmax(calc(100vh - var(--topbar-height)), auto);
  min-height: 100vh;
}

.topbar {
  grid-area: topbar;
  display: flex;
  align-items: center;
  min-width: 0;
  padding: 0 var(--space-6);
  color: var(--color-text-on-shell);
  background: var(--color-shell-strong);
  border-bottom: 1px solid var(--color-shell-border);
}

.brand {
  display: inline-flex;
  align-items: center;
  color: inherit;
  font-size: var(--text-lg);
  font-weight: 700;
  line-height: 1;
  text-decoration: none;
}

.auth-host {
  display: grid;
  grid-column: 1 / -1;
  grid-row: 2;
  min-width: 0;
  min-height: calc(100vh - var(--topbar-height));
  padding: var(--space-6);
  place-items: center;
  background: var(--color-surface);
}

.auth-host .module-state {
  width: min(480px, 100%);
}

#appShell[data-auth-state="authenticated"] .auth-host,
#appShell:not([data-auth-state="authenticated"]) #adminNav,
#appShell:not([data-auth-state="authenticated"]) #adminPageHost {
  display: none;
}

#adminNav {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  grid-area: nav;
  min-width: 0;
  padding: var(--space-4) var(--space-3);
  color: var(--color-text-on-shell);
  background: var(--color-shell);
  border-right: 1px solid var(--color-shell-border);
}

.admin-nav__items {
  display: grid;
  gap: var(--space-1);
}

.admin-nav__button,
.admin-nav__logout {
  min-height: 40px;
  padding: var(--space-2) var(--space-3);
  color: inherit;
  text-align: left;
  background: transparent;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
}

.admin-nav__button:hover,
.admin-nav__button[aria-current="page"],
.admin-nav__logout:hover {
  background: var(--color-shell-strong);
  border-color: var(--color-shell-border);
}

.admin-nav__logout {
  margin-top: auto;
}

.auth-panel {
  width: min(440px, 100%);
  padding: var(--space-6);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: 0 12px 32px rgb(11 45 39 / 10%);
}

.auth-panel__title {
  font-size: var(--text-xl);
}

.auth-panel__subtitle,
.auth-panel__status {
  margin-top: var(--space-2);
  color: var(--color-text-muted);
}

.auth-modes {
  display: flex;
  gap: var(--space-1);
  margin-top: var(--space-4);
  overflow-x: auto;
}

.auth-mode {
  min-height: 38px;
  padding: var(--space-2) var(--space-3);
  white-space: nowrap;
  background: var(--color-surface-muted);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
}

.auth-mode[aria-selected="true"] {
  color: var(--color-text-on-shell);
  background: var(--color-shell);
  border-color: var(--color-shell);
}

.auth-form,
.auth-field {
  display: grid;
  gap: var(--space-2);
}

.auth-form {
  margin-top: var(--space-4);
}

.auth-field__label {
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  font-weight: 700;
}

.auth-submit {
  margin-top: var(--space-2);
}

#adminPageHost {
  grid-area: main;
  min-width: 0;
  padding: var(--space-6);
  background: var(--color-surface);
}

#dialogHost,
#toastHost {
  position: relative;
  z-index: 20;
}

#toastHost {
  position: fixed;
  right: var(--space-4);
  bottom: var(--space-4);
  width: min(360px, calc(100% - 32px));
}

@media (max-width: 760px) {
  #appShell {
    grid-template-areas:
      "topbar"
      "nav"
      "main";
    grid-template-columns: minmax(0, 1fr);
    grid-template-rows: var(--topbar-height) auto minmax(0, 1fr);
  }

  .topbar,
  .auth-host,
  #adminPageHost {
    padding-right: var(--space-4);
    padding-left: var(--space-4);
  }

  .brand {
    min-height: 44px;
  }

  #adminNav {
    display: flex;
    flex-direction: row;
    flex-wrap: nowrap;
    align-items: center;
    gap: var(--space-1);
    overflow-x: auto;
    padding: var(--space-2) var(--space-4);
    border-right: 0;
    border-bottom: 1px solid var(--color-shell-border);
  }

  .admin-nav__items {
    display: flex;
    flex-wrap: nowrap;
    gap: var(--space-1);
  }

  .admin-nav__button,
  .admin-nav__logout {
    flex: 0 0 auto;
    min-height: 44px;
    white-space: nowrap;
  }

  .admin-nav__logout {
    margin-top: 0;
    margin-left: auto;
  }

  .auth-panel {
    padding: var(--space-4);
  }
}