:root {
    /* Theme tokens — single source of truth */
    --sidebar-width: 200px;
    --nav-bg-start: #FFF8E1;
    --nav-bg-end: #FFF3CD;
    --nav-text: #0C3B26;
    --nav-accent: #2F9E44;
    --top-row-height: 4.5rem;
    --banner-min: 14rem;
    --banner-vh: 50vh;
    --banner-max: 34rem;
}