/* STARNUS BILLING - CSS Variables & Design Tokens */
:root {
  /* Brand & Theme Colors (Light Mode) */
  --color-primary: #2563EB;
  --color-primary-dark: #1D4ED8;
  --color-primary-light: #EFF6FF;
  --color-primary-rgb: 37, 99, 235;

  --sidebar-dark: #0F172A;
  --sidebar-dark-surface: #1E293B;
  --sidebar-dark-border: #334155;
  --sidebar-dark-text: #E2E8F0;
  --sidebar-dark-muted: #94A3B8;
  --sidebar-dark-active: #2563EB;

  /* App Canvas & Surfaces */
  --bg-app: #F8FAFC;
  --bg-surface: #FFFFFF;
  --bg-surface-secondary: #F1F5F9;
  --bg-surface-tertiary: #E2E8F0;

  /* Typography Colors */
  --text-primary: #0F172A;
  --text-secondary: #475569;
  --text-muted: #94A3B8;
  --text-inverse: #FFFFFF;

  /* Borders & Dividers */
  --border-color: #E2E8F0;
  --border-focus: #2563EB;
  --border-subtle: #F1F5F9;

  /* Semantic Feedback Colors */
  --color-success: #16A34A;
  --color-success-bg: #DCFCE7;
  --color-success-text: #15803D;

  --color-warning: #D97706;
  --color-warning-bg: #FEF3C7;
  --color-warning-text: #B45309;

  --color-danger: #DC2626;
  --color-danger-bg: #FEE2E2;
  --color-danger-text: #B91C1C;

  --color-info: #0891B2;
  --color-info-bg: #CFFAFE;
  --color-info-text: #0E7490;

  /* Layout Spacing & Geometry */
  --sidebar-width: 270px;
  --sidebar-collapsed-width: 76px;
  --header-height: 70px;
  --footer-height: 50px;

  /* Border Radii */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-xl: 18px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px -1px rgba(0, 0, 0, 0.1);
  --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, 0.04);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.08);

  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.35s ease;

  /* Z-Index Hierarchy */
  --z-sidebar: 40;
  --z-header: 30;
  --z-dropdown: 50;
  --z-modal-backdrop: 90;
  --z-modal: 100;
  --z-toast: 110;
}

/* Dark Mode Tokens */
[data-theme="dark"] {
  --color-primary: #3B82F6;
  --color-primary-dark: #2563EB;
  --color-primary-light: rgba(59, 130, 246, 0.15);
  --color-primary-rgb: 59, 130, 246;

  --bg-app: #090D16;
  --bg-surface: #111827;
  --bg-surface-secondary: #1F2937;
  --bg-surface-tertiary: #374151;

  --text-primary: #F9FAFB;
  --text-secondary: #9CA3AF;
  --text-muted: #6B7280;
  --text-inverse: #0F172A;

  --border-color: #1F2937;
  --border-focus: #3B82F6;
  --border-subtle: #182234;

  --color-success: #22C55E;
  --color-success-bg: rgba(34, 197, 94, 0.15);
  --color-success-text: #4ADE80;

  --color-warning: #F59E0B;
  --color-warning-bg: rgba(245, 158, 11, 0.15);
  --color-warning-text: #FBBF24;

  --color-danger: #EF4444;
  --color-danger-bg: rgba(239, 68, 68, 0.15);
  --color-danger-text: #F87171;

  --color-info: #06B6D4;
  --color-info-bg: rgba(6, 182, 212, 0.15);
  --color-info-text: #38BDF8;

  --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
  --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.4);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.6);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.7);
}