:root,
[data-theme="dark"] {
    --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
    --font-mono: ui-monospace, 'SF Mono', Menlo, monospace;

    /* —— Root scale (14px base — compact professional density) —— */
    --font-size-root: 14px;

    --text-2xs: 0.625rem;
    --text-xs: 0.6875rem;
    --text-sm: 0.75rem;
    --text-base: 0.8125rem;
    --text-md: 0.875rem;
    --text-lg: 1rem;
    --text-xl: 1.125rem;
    --text-2xl: 1.25rem;

    --leading-tight: 1.3;
    --leading-normal: 1.45;
    --leading-relaxed: 1.55;

    --heading-page: var(--text-lg);
    --heading-section: var(--text-md);
    --heading-card: var(--text-base);

    --space-1: 0.2rem;
    --space-2: 0.35rem;
    --space-3: 0.5rem;
    --space-4: 0.65rem;
    --space-5: 0.85rem;
    --space-6: 1rem;
    --space-8: 1.15rem;

    --icon-xs: 12px;
    --icon-sm: 14px;
    --icon-md: 16px;
    --icon-lg: 18px;

    --control-size: 1.875rem;
    --control-size-sm: 1.625rem;
    --input-padding-y: 0.35rem;
    --input-padding-x: 0.55rem;
    --btn-padding-y: 0.35rem;
    --btn-padding-x: 0.65rem;
    --btn-font-size: var(--text-sm);
    --btn-font-size-sm: var(--text-xs);

    --color-bg: #0b1120;
    --color-bg-elevated: #131c31;
    --color-bg-surface: #1e293b;
    --color-bg-hover: #273449;
    --color-topbar-bg: #0f172a;
    --color-sidebar-bg: #0f172a;
    --color-control-bg: #1e293b;
    --color-control-border: #334155;

    --color-border: #334155;
    --color-border-light: #475569;

    --color-text: #f1f5f9;
    --color-text-muted: #94a3b8;
    --color-text-dim: #64748b;

    --color-primary: #6366f1;
    --color-primary-hover: #818cf8;
    --color-primary-soft: rgba(99, 102, 241, 0.2);
    --color-brand-gradient-end: #7c3aed;
    --color-nav-active: #c7d2fe;

    --color-success: #34d399;
    --color-success-soft: rgba(52, 211, 153, 0.15);
    --color-warning: #fbbf24;
    --color-warning-soft: rgba(251, 191, 36, 0.15);
    --color-danger: #f87171;
    --color-danger-soft: rgba(248, 113, 113, 0.15);

    --sidebar-width: 220px;
    --header-height: 52px;
    --radius-sm: 4px;
    --radius: 6px;
    --radius-lg: 8px;
    --shadow: 0 6px 24px rgba(0, 0, 0, 0.32);
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.2);
    --transition: 0.15s ease;
}

[data-theme="light"] {
    --color-bg: #f1f5f9;
    --color-bg-elevated: #ffffff;
    --color-bg-surface: #ffffff;
    --color-bg-hover: #f1f5f9;
    --color-topbar-bg: #ffffff;
    --color-sidebar-bg: #ffffff;
    --color-control-bg: #f8fafc;
    --color-control-border: #e2e8f0;

    --color-border: #e2e8f0;
    --color-border-light: #cbd5e1;

    --color-text: #0f172a;
    --color-text-muted: #475569;
    --color-text-dim: #64748b;

    --color-primary: #4f46e5;
    --color-primary-hover: #4338ca;
    --color-primary-soft: rgba(79, 70, 229, 0.12);
    --color-brand-gradient-end: #6366f1;
    --color-nav-active: #4338ca;

    --color-success: #059669;
    --color-success-soft: rgba(5, 150, 105, 0.1);
    --color-warning: #d97706;
    --color-warning-soft: rgba(217, 119, 6, 0.1);
    --color-danger: #dc2626;
    --color-danger-soft: rgba(220, 38, 38, 0.1);

    --shadow: 0 4px 20px rgba(15, 23, 42, 0.08);
    --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.06);
}