:root {
    /* Light mode colors (default) */
    --bg-base: #FFFFFF;
    --bg-surface: #F8F9FA;
    --bg-elevated: #F0F2F5;
    --bg-hover: #E8EAEF;
    --bg-active: #E0E2E8;

    /* Borders */
    --border-subtle: rgba(0,0,0,0.06);
    --border-default: rgba(0,0,0,0.12);
    --border-strong: rgba(0,0,0,0.18);

    /* Text */
    --text-primary: #1A1A1E;
    --text-secondary: #555560;
    --text-muted: #8B8B96;

    /* Brand accent (overridden per client via client_config) */
    --accent: #cfa736;
    --accent-rgb: 207, 167, 54;
    --accent-subtle: rgba(var(--accent-rgb), 0.10);
    --accent-hover: rgba(var(--accent-rgb), 0.18);

    /* Semantic — slightly deeper for light bg contrast */
    --success: #16A34A;
    --success-subtle: rgba(22,163,74,0.10);
    --warning: #CA8A04;
    --warning-subtle: rgba(202,138,4,0.10);
    --destructive: #DC2626;
    --destructive-subtle: rgba(220,38,38,0.10);

    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
    --text-xs: 0.75rem;
    --text-sm: 0.875rem;
    --text-base: 1rem;
    --text-lg: 1.25rem;
    --text-xl: 1.5rem;
    --text-2xl: 2rem;
    --text-3xl: 2.5rem;

    /* Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;

    /* Radius */
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;

    /* Shadows (visible on light bg) */
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.06);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.08);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
}

/* Dark mode (toggled via JS) */
body.dark-mode {
    --bg-base: #0C0C0E;
    --bg-surface: #141416;
    --bg-elevated: #1C1C20;
    --bg-hover: #242428;
    --bg-active: #2C2C32;

    --border-subtle: rgba(255,255,255,0.06);
    --border-default: rgba(255,255,255,0.10);
    --border-strong: rgba(255,255,255,0.16);

    --text-primary: #EDEDEF;
    --text-secondary: #8B8B96;
    --text-muted: #56565E;

    --accent-subtle: rgba(var(--accent-rgb), 0.12);
    --accent-hover: rgba(var(--accent-rgb), 0.20);

    --success: #22C55E;
    --success-subtle: rgba(34,197,94,0.12);
    --warning: #EAB308;
    --warning-subtle: rgba(234,179,8,0.12);
    --destructive: #EF4444;
    --destructive-subtle: rgba(239,68,68,0.12);

    --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.4);
}