/* Base UI variables and reset for Superchart */
html, body {
    height: 100%;
    margin: 0;
    padding: 0;
    background: var(--bg-primary);
    color: var(--text-primary);
    font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial;
}

/* Utility helpers */
.hidden { display:none !important; }
.flex { display:flex; }
.center { display:flex; align-items:center; justify-content:center; }