:root{--bg-app:#ffffff;--bg-surface-1:#f8fafc;--bg-surface-2:#f1f5f9;--border-subtle:#e2e8f0;--text-primary:#0f172a;--text-secondary:#334155;--text-muted:#64748b;--brand-primary:#2563eb;--brand-secondary:#7c3aed;--success:#10b981;--warning:#f59e0b;--error:#ef4444;--text-on-brand:#ffffff}:root.dark{--bg-app:#0f172a;--bg-surface-1:#1a2436;--bg-surface-2:#0b1220;--border-subtle:rgba(148,163,184,0.18);--text-primary:#e5e7eb;--text-secondary:#cbd5e1;--text-muted:#94a3b8;--brand-primary:#2563eb;--brand-secondary:#7c3aed;--text-on-brand:#ffffff}.bg-app{background-color:var(--bg-app)}.bg-surface-1{background-color:var(--bg-surface-1)}.bg-surface-2{background-color:var(--bg-surface-2)}.text-primary{color:var(--text-primary)}.text-secondary{color:var(--text-secondary)}.text-muted{color:var(--text-muted)}.border-subtle{border-color:var(--border-subtle)}