/* =============================================
   Data Center High School - CSS Variables
   Brand colors based on dch.edu.vn
   ============================================= */

:root {
  /* ===========================================
     BRAND COLORS - Green Theme
     =========================================== */
  
  /* Primary Greens */
  --color-primary: #457312;
  --color-primary-dark: #2E4D0C;
  --color-primary-light: #5a9216;
  
  /* Secondary Greens */
  --color-secondary: #8BC34A;
  --color-secondary-light: #a8d573;
  --color-secondary-dark: #6b9b3a;
  
  /* Accent Colors */
  --color-accent: #FF9800;
  --color-accent-dark: #F57C00;
  --color-accent-light: #FFB74D;
  
  /* Neutral Colors */
  --color-white: #FFFFFF;
  --color-black: #000000;
  --color-gray-100: #F5F5F5;
  --color-gray-200: #EEEEEE;
  --color-gray-300: #E0E0E0;
  --color-gray-400: #BDBDBD;
  --color-gray-500: #9E9E9E;
  --color-gray-600: #757575;
  --color-gray-700: #616161;
  --color-gray-800: #424242;
  --color-gray-900: #212121;
  
  /* Text Colors */
  --color-text-primary: #333333;
  --color-text-secondary: #666666;
  --color-text-light: #FFFFFF;
  --color-text-muted: #999999;
  
  /* Background Colors */
  --color-bg-primary: #FFFFFF;
  --color-bg-secondary: #F8FFF5;
  --color-bg-gradient-start: #e8f5e9;
  --color-bg-gradient-end: #c8e6c9;
  --color-bg-dark: #1a1a1a;
  
  /* Status Colors */
  --color-success: #4CAF50;
  --color-warning: #FF9800;
  --color-error: #F44336;
  --color-info: #2196F3;

  /* ===========================================
     TYPOGRAPHY
     =========================================== */
  
  /* Font Families */
  --font-primary: 'Inter', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  --font-heading: 'Outfit', 'Inter', sans-serif;
  --font-accent: 'Roboto', sans-serif;
  
  /* Font Sizes */
  --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-normal: 400;
  --font-medium: 500;
  --font-semibold: 600;
  --font-bold: 700;
  --font-extrabold: 800;
  
  /* Line Heights */
  --leading-none: 1;
  --leading-tight: 1.25;
  --leading-snug: 1.375;
  --leading-normal: 1.5;
  --leading-relaxed: 1.625;
  --leading-loose: 2;

  /* ===========================================
     SPACING
     =========================================== */
  
  --space-0: 0;
  --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 */
  
  /* ===========================================
     LAYOUT
     =========================================== */
  
  --container-sm: 640px;
  --container-md: 768px;
  --container-lg: 1024px;
  --container-xl: 1280px;
  --container-2xl: 1536px;
  
  /* ===========================================
     BORDERS & RADIUS
     =========================================== */
  
  --radius-none: 0;
  --radius-sm: 0.125rem;   /* 2px */
  --radius-md: 0.375rem;   /* 6px */
  --radius-lg: 0.5rem;     /* 8px */
  --radius-xl: 0.75rem;    /* 12px */
  --radius-2xl: 1rem;      /* 16px */
  --radius-3xl: 1.5rem;    /* 24px */
  --radius-full: 9999px;
  
  --border-thin: 1px;
  --border-medium: 2px;
  --border-thick: 4px;

  /* ===========================================
     SHADOWS
     =========================================== */
  
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
  --shadow-inner: inset 0 2px 4px 0 rgba(0, 0, 0, 0.06);
  --shadow-green: 0 4px 20px rgba(69, 115, 18, 0.3);
  
  /* ===========================================
     TRANSITIONS
     =========================================== */
  
  --transition-fast: 150ms ease;
  --transition-normal: 300ms ease;
  --transition-slow: 500ms ease;
  --transition-bounce: 300ms cubic-bezier(0.68, -0.55, 0.265, 1.55);

  /* ===========================================
     Z-INDEX
     =========================================== */
  
  --z-behind: -1;
  --z-base: 0;
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-fixed: 300;
  --z-modal-backdrop: 400;
  --z-modal: 500;
  --z-popover: 600;
  --z-tooltip: 700;
}