:root {
  /* Brand & Neutrals */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  
  --bg-app: #f8fafc;
  --bg-surface: #ffffff;
  --bg-surface-elevated: #ffffff;
  --bg-surface-subtle: #f1f5f9;
  --bg-surface-hover: #e2e8f0;
  
  --text-main: #0f172a;
  --text-muted: #64748b;
  --text-light: #94a3b8;
  --text-inverse: #ffffff;
  
  --border-subtle: #e2e8f0;
  --border-strong: #cbd5e1;
  
  /* Primary & Accent */
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --primary-light: #dbeafe;
  --primary-subtle: #eff6ff;
  
  --success: #10b981;
  --success-light: #d1fae5;
  --warning: #f59e0b;
  --warning-light: #fef3c7;
  --danger: #ef4444;
  --danger-light: #fee2e2;
  --info: #06b6d4;
  --info-light: #cffafe;

  /* User 1 default (Blue/Indigo) */
  --user1-color: #3b82f6;
  --user1-bg: #eff6ff;
  --user1-border: #bfdbfe;
  --user1-text: #1d4ed8;

  /* User 2 default (Emerald/Teal) */
  --user2-color: #10b981;
  --user2-bg: #ecfdf5;
  --user2-border: #a7f3d0;
  --user2-text: #047857;

  /* Category colors */
  --cat-limpieza: #3b82f6;
  --cat-cocina: #f97316;
  --cat-lavadora: #06b6d4;
  --cat-perro: #8b5cf6;
  --cat-chapuzas: #eab308;
  --cat-compras: #ec4899;
  --cat-hogar: #10b981;

  /* Geometry & Shadows */
  --radius-xs: 6px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  --radius-full: 9999px;

  --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.04);
  --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.08), 0 1px 2px -1px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -2px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.06);

  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s ease;
  --transition-bounce: 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
  
  --sidebar-width: 250px;
  --bottom-nav-height: 64px;
  --header-height: 60px;
}

[data-theme="dark"] {
  --bg-app: #090d16;
  --bg-surface: #111827;
  --bg-surface-elevated: #1e293b;
  --bg-surface-subtle: #1e293b;
  --bg-surface-hover: #334155;

  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-light: #64748b;

  --border-subtle: #1e293b;
  --border-strong: #334155;

  --primary-light: #1e3a8a;
  --primary-subtle: #172554;

  --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.4);
  --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.4);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4);
}