/* Ambient background — a faint survey-plan grid, fixed behind everything.
   Shared by the auth layout and the main app shell. */
.app-bg {
    position: fixed;
    inset: 0;
    z-index: 0;
    overflow: hidden;
    background: var(--color-bg-canvas);
    pointer-events: none;
}
.app-bg::before {
    content: "";
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(color-mix(in srgb, var(--color-text-primary) 6%, transparent) 1px, transparent 1px),
        linear-gradient(90deg, color-mix(in srgb, var(--color-text-primary) 6%, transparent) 1px, transparent 1px);
    background-size: 42px 42px;
}