Control-Center/frontend/src/app/layout/bottom-nav/bottom-nav.component.scss

// ============================================================================
// Bottom Navigation Bar — Mobile Navigation
// Per CUB-27 spec breakpoints:
//   Compact (0–599px): Visible — M3 NavigationBar pattern
//   Medium+ (≥600px): Hidden — nav rail takes over
// ============================================================================

.bottom-nav {
  display: none; // Hidden on desktop, shown on mobile via media query
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: var(--cc-bottom-nav-height);
  background-color: var(--cc-surface-container-high);
  border-top: 1px solid var(--cc-outline);
  z-index: 50;
  align-items: center;
  justify-content: space-around;
  padding: 0 8px;
  // Safe area inset for notched devices
  padding-bottom: env(safe-area-inset-bottom, 0px);
}

.bottom-nav__item {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  min-width: 48px;
  min-height: 48px;
  padding: 8px 0;
  text-decoration: none;
  color: var(--cc-on-surface-variant);
  border-radius: 16px;
  transition: color 150ms ease, background-color 150ms ease;

  &:hover {
    color: var(--cc-on-surface);
    background-color: rgba(255, 255, 255, 0.06);
  }

  &--active {
    color: var(--status-active);
    background-color: var(--status-active-bg);

    .bottom-nav__label {
      font-weight: 500;
    }
  }
}

.bottom-nav__icon-wrapper {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 16px;

  .bottom-nav__item--active & {
    background-color: var(--status-active-bg);
  }
}

.bottom-nav__label {
  font-size: 12px;
  font-weight: 400;
  letter-spacing: 0.02em;
  white-space: nowrap;
}

// ---------------------------------------------------------------------------
// Compact (0–599px): Show bottom nav
// ---------------------------------------------------------------------------
@media (max-width: 599px) {
  .bottom-nav {
    display: flex;
  }
}

// ---------------------------------------------------------------------------
// Medium+ (≥600px): Hidden — nav rail takes over
// ---------------------------------------------------------------------------

// ---------------------------------------------------------------------------
// Accessibility: Reduced Motion
// ---------------------------------------------------------------------------
@media (prefers-reduced-motion: reduce) {
  .bottom-nav__item {
    transition: none;
  }
}