/* ==========================================================================
   VietLegacy - Design System Variables
   ========================================================================== */

:root {
  /* ========== Colors ========== */

  /* Primary Colors */
  --color-primary: #C41E3A;           /* Vietnamese flag red - heritage, patriotic */
  --color-primary-dark: #9B1830;      /* Darker red for hover states */
  --color-primary-light: #E8425A;     /* Lighter red for accents */

  /* Secondary Colors */
  --color-gold: #FFD700;              /* Gold - prestige, tradition */
  --color-gold-dark: #D4AF00;         /* Darker gold */
  --color-blue: #1E3A8A;              /* Deep blue - technology, trust */
  --color-blue-light: #3B5998;        /* Lighter blue */

  /* Neutral Colors */
  --color-white: #FFFFFF;
  --color-gray-50: #F9FAFB;           /* Lightest gray - backgrounds */
  --color-gray-100: #F3F4F6;          /* Light gray - card backgrounds */
  --color-gray-200: #E5E7EB;          /* Border gray */
  --color-gray-300: #D1D5DB;          /* Disabled states */
  --color-gray-400: #9CA3AF;          /* Placeholder text */
  --color-gray-500: #6B7280;          /* Secondary text */
  --color-gray-600: #4B5563;          /* Body text */
  --color-gray-700: #374151;          /* Dark text */
  --color-gray-800: #1F2937;          /* Headings */
  --color-gray-900: #111827;          /* Darkest text */
  --color-black: #000000;

  /* Semantic Colors */
  --color-success: #10B981;
  --color-warning: #F59E0B;
  --color-error: #EF4444;
  --color-info: #3B82F6;

  /* ========== Typography ========== */

  /* Font Families */
  --font-heading: 'Playfair Display', Georgia, serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;

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

  /* Font Weights */
  --font-light: 300;
  --font-regular: 400;
  --font-medium: 500;
  --font-semibold: 600;
  --font-bold: 700;

  /* Line Heights */
  --leading-none: 1;
  --leading-tight: 1.25;
  --leading-snug: 1.375;
  --leading-normal: 1.5;
  --leading-relaxed: 1.625;
  --leading-loose: 2;

  /* Letter Spacing */
  --tracking-tight: -0.025em;
  --tracking-normal: 0;
  --tracking-wide: 0.025em;

  /* ========== Spacing ========== */
  --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 */
  --space-32: 8rem;                   /* 128px */

  /* ========== Layout ========== */
  --container-sm: 640px;
  --container-md: 768px;
  --container-lg: 1024px;
  --container-xl: 1280px;
  --container-2xl: 1440px;

  /* ========== Borders ========== */
  --radius-sm: 0.25rem;               /* 4px */
  --radius-md: 0.5rem;                /* 8px */
  --radius-lg: 0.75rem;               /* 12px */
  --radius-xl: 1rem;                  /* 16px */
  --radius-2xl: 1.5rem;               /* 24px */
  --radius-full: 9999px;              /* Full rounded */

  --border-width: 1px;
  --border-width-2: 2px;

  /* ========== Shadows ========== */
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
  --shadow-2xl: 0 25px 50px -12px rgb(0 0 0 / 0.25);

  /* ========== Transitions ========== */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 350ms ease;
  --transition-slower: 500ms ease;

  /* ========== Z-Index ========== */
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-fixed: 300;
  --z-modal-backdrop: 400;
  --z-modal: 500;
  --z-tooltip: 600;

  /* ========== Header ========== */
  --header-height: 80px;
  --header-height-mobile: 64px;
}

/* ========== Dark Mode Variables (Future) ========== */
@media (prefers-color-scheme: dark) {
  :root {
    /* Can be expanded for dark mode support */
  }
}