/* ============================================
   DESIGN SYSTEM - VARIABLES
   Maharat Al-Muhandis Website
   ============================================ */

:root {
  /* ========== COLOR SYSTEM ========== */
  
  /* Primary Colors */
  --color-periwinkle: #BBC2FC;
  --color-blue: #1A25F7;
  --color-black: #030303;
  --color-white: #FFFFFF;
  
  /* Secondary Colors */
  --color-blue-dark: #0F1A9F;
  --color-blue-light: #4A54FF;
  --color-periwinkle-light: #D4D9FD;
  --color-periwinkle-dark: #9BA4F5;
  
  /* Neutral Colors */
  --color-gray-100: #F8F9FA;
  --color-gray-200: #E9ECEF;
  --color-gray-300: #DEE2E6;
  --color-gray-400: #CED4DA;
  --color-gray-500: #ADB5BD;
  --color-gray-600: #6C757D;
  --color-gray-700: #495057;
  --color-gray-800: #343A40;
  --color-gray-900: #212529;
  
  /* Semantic Colors */
  --color-success: #28A745;
  --color-warning: #FFC107;
  --color-error: #DC3545;
  --color-info: #17A2B8;
  
  /* Overlay & Shadows */
  --overlay-dark: rgba(3, 3, 3, 0.7);
  --overlay-blue: rgba(26, 37, 247, 0.85);
  --overlay-light: rgba(255, 255, 255, 0.1);
  
  --shadow-sm: 0 2px 4px rgba(3, 3, 3, 0.1);
  --shadow-md: 0 4px 12px rgba(3, 3, 3, 0.15);
  --shadow-lg: 0 8px 24px rgba(3, 3, 3, 0.2);
  --shadow-xl: 0 16px 48px rgba(3, 3, 3, 0.25);
  
  /* Glassmorphism */
  --glass-bg: rgba(255, 255, 255, 0.1);
  --glass-border: rgba(255, 255, 255, 0.2);
  --glass-blur: blur(10px);
  
  /* ========== TYPOGRAPHY ========== */
  
  /* Font Families */
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-secondary: 'Roboto', sans-serif;
  --font-mono: 'Courier New', monospace;
  
  /* 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 */
  --text-7xl: 4.5rem;      /* 72px */
  
  /* Font Weights */
  --font-light: 300;
  --font-normal: 400;
  --font-medium: 500;
  --font-semibold: 600;
  --font-bold: 700;
  --font-extrabold: 800;
  
  /* Line Heights */
  --leading-tight: 1.25;
  --leading-normal: 1.5;
  --leading-relaxed: 1.75;
  --leading-loose: 2;
  
  /* ========== 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 Widths */
  --container-sm: 640px;
  --container-md: 768px;
  --container-lg: 1024px;
  --container-xl: 1280px;
  --container-2xl: 1536px;
  
  /* Border Radius */
  --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;
  
  /* Z-Index Layers */
  --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;
  
  /* ========== TRANSITIONS ========== */
  
  /* Duration */
  --duration-fast: 150ms;
  --duration-normal: 300ms;
  --duration-slow: 500ms;
  
  /* Easing */
  --ease-in: cubic-bezier(0.4, 0, 1, 1);
  --ease-out: cubic-bezier(0, 0, 0.2, 1);
  --ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);
  --ease-smooth: cubic-bezier(0.25, 0.1, 0.25, 1);
  
  /* Common Transitions */
  --transition-all: all var(--duration-normal) var(--ease-in-out);
  --transition-colors: color var(--duration-normal) var(--ease-in-out),
                       background-color var(--duration-normal) var(--ease-in-out),
                       border-color var(--duration-normal) var(--ease-in-out);
  --transition-transform: transform var(--duration-normal) var(--ease-smooth);
  --transition-opacity: opacity var(--duration-normal) var(--ease-in-out);
  
  /* ========== BREAKPOINTS (for JS) ========== */
  
  --breakpoint-sm: 640px;
  --breakpoint-md: 768px;
  --breakpoint-lg: 1024px;
  --breakpoint-xl: 1280px;
  --breakpoint-2xl: 1536px;
}

/* ========== RESPONSIVE BREAKPOINTS ========== */

/* Mobile First Approach */

/* Small devices (landscape phones, 640px and up) */
@media (min-width: 640px) {
  :root {
    --text-5xl: 3.5rem;
    --text-6xl: 4rem;
    --text-7xl: 5rem;
  }
}

/* Medium devices (tablets, 768px and up) */
@media (min-width: 768px) {
  :root {
    --space-section: var(--space-24);
  }
}

/* Large devices (desktops, 1024px and up) */
@media (min-width: 1024px) {
  :root {
    --text-5xl: 4rem;
    --text-6xl: 5rem;
    --text-7xl: 6rem;
  }
}

/* Extra large devices (large desktops, 1280px and up) */
@media (min-width: 1280px) {
  :root {
    --space-section: var(--space-32);
  }
}