/* ==========================================================================
   DESIGN TOKENS & CSS CUSTOM PROPERTIES (Refactored)
   ========================================================================== */

:root {
  /* 1. Breakpoints */
  --bp-mobile-sm: 320px;
  --bp-mobile-lg: 480px;
  --bp-tablet: 768px;
  --bp-desktop-sm: 1024px;
  --bp-desktop-lg: 1440px;

  /* 2. Brand Palette */
  --color-primary-50: #EEF2FF;
  --color-primary-100: #E0E7FF;
  --color-primary-200: #C7D2FE;
  --color-primary-300: #A5B4FC;
  --color-primary-400: #818CF8;
  --color-primary-500: #6366F1;
  --color-primary-600: #4F46E5;
  --color-primary-700: #4338CA;
  --color-primary-800: #3730A3;
  --color-primary-900: #312E81;
  
  --color-violet-500: #8B5CF6;
  --color-violet-600: #7C3AED;
  --color-violet-700: #6D28D9;

  --color-gradient-primary: linear-gradient(-135deg, var(--color-primary-600) 14.65%, var(--color-violet-600) 85.35%);
  --color-gradient-dark: linear-gradient(180deg, #101828 0%, #1D2939 100%);
  --color-gradient-light: linear-gradient(180deg, #FFFFFF 0%, #F7F9FF 100%);

  /* 3. Neutrals */
  --color-white: #FFFFFF;
  --color-gray-25: #FCFCFD;
  --color-gray-50: #F8FAFC;
  --color-gray-100: #F1F5F9;
  --color-gray-200: #E2E8F0;
  --color-gray-300: #CBD5E1;
  --color-gray-400: #94A3B8;
  --color-gray-500: #64748B;
  --color-gray-600: #475569;
  --color-gray-700: #334155;
  --color-gray-800: #1E293B;
  --color-gray-900: #101828;
  --color-gray-950: #0B0F19;

  --color-border: #EAECF0;
  --color-border-subtle: #F2F4F7;
  --color-bg-page: #F7F9FF;
  --color-bg-surface: #FFFFFF;
  --color-bg-glass: rgba(255, 255, 255, 0.88);

  /* 4. Typography Tokens */
  --font-family-base: 'Be Vietnam Pro', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-weight-regular: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  --font-weight-extrabold: 800;

  /* Font Scale */
  --font-size-xs: 0.75rem;    /* 12px */
  --font-size-sm: 0.875rem;   /* 14px */
  --font-size-base: 1rem;     /* 16px */
  --font-size-lg: 1.125rem;   /* 18px */
  --font-size-xl: 1.25rem;    /* 20px */
  --font-size-2xl: 1.5rem;    /* 24px */
  --font-size-3xl: 1.875rem;  /* 30px */
  --font-size-4xl: 2.25rem;   /* 36px */
  --font-size-5xl: 3rem;      /* 48px */
  --font-size-6xl: 3.75rem;   /* 60px */

  /* Line Heights */
  --line-height-tight: 1.2;
  --line-height-snug: 1.35;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.625;

  /* 5. Spacing System */
  --space-1: 0.25rem;  /* 4px */
  --space-2: 0.5rem;   /* 8px */
  --space-3: 0.75rem;  /* 12px */
  --space-4: 1rem;     /* 16px */
  --space-5: 1.25rem;  /* 20px */
  --space-6: 1.5rem;   /* 24px */
  --space-8: 2rem;     /* 32px */
  --space-10: 2.5rem;  /* 40px */
  --space-12: 3rem;    /* 48px */
  --space-16: 4rem;    /* 64px */
  --space-20: 5rem;    /* 80px */
  --space-24: 6rem;    /* 96px */

  /* 6. Button Height Tokens */
  --btn-height-sm: 36px;
  --btn-height-md: 44px;
  --btn-height-lg: 52px;

  /* 7. Grid Gap Tokens */
  --grid-gap-sm: 1rem;
  --grid-gap-md: 1.5rem;
  --grid-gap-lg: 2rem;

  /* 8. Layout Containers */
  --container-max-width: 1280px;
  --container-wide-width: 1440px;
  --container-padding: 1rem;

  /* 9. Shadows & Borders */
  --shadow-xs: 0px 1px 2px rgba(16, 24, 40, 0.05);
  --shadow-sm: 0px 1px 3px rgba(16, 24, 40, 0.1), 0px 1px 2px rgba(16, 24, 40, 0.06);
  --shadow-md: 0px 4px 8px -2px rgba(16, 24, 40, 0.1), 0px 2px 4px -2px rgba(16, 24, 40, 0.06);
  --shadow-lg: 0px 12px 16px -4px rgba(16, 24, 40, 0.08), 0px 4px 6px -2px rgba(16, 24, 40, 0.03);
  --shadow-xl: 0px 20px 24px -4px rgba(16, 24, 40, 0.08), 0px 8px 8px -4px rgba(16, 24, 40, 0.03);
  --shadow-primary-glow: 0px 6px 14px -2px rgba(79, 70, 229, 0.3);

  --radius-sm: 0.375rem; /* 6px */
  --radius-md: 0.5rem;   /* 8px */
  --radius-lg: 0.75rem;  /* 12px */
  --radius-xl: 1rem;     /* 16px */
  --radius-2xl: 1.25rem; /* 20px */
  --radius-full: 9999px;

  /* 10. Transitions & Z-Index */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);

  --z-negative: -1;
  --z-normal: 1;
  --z-dropdown: 100;
  --z-sticky: 500;
  --z-header: 1000;
  --z-drawer: 1500;
  --z-modal: 2000;
}

@media (min-width: 768px) {
  :root {
    --container-padding: 1.5rem;
  }
}
@media (min-width: 1024px) {
  :root {
    --container-padding: 2rem;
  }
}