/* ===================================
   CSS CUSTOM PROPERTIES (VARIABLES)
   =================================== */

:root {
  /* Primary Colors */
  --color-primary: #667eea;
  --color-primary-dark: #5568d3;
  --color-dark-blue: #2c3e50;
  --color-accent: #764ba2;
  
  /* Secondary Colors */
  --color-light-gray: #f8f9fa;
  --color-medium-gray: #7f8c8d;
  --color-success: #27ae60;
  --color-warning: #f39c12;
  --color-white: #ffffff;
  --color-black: #000000;
  
  /* Gradients */
  --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --gradient-secondary: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
  --gradient-hero: linear-gradient(135deg, rgba(102, 126, 234, 0.1) 0%, rgba(118, 75, 162, 0.1) 100%);
  
  /* Typography */
  --font-heading: 'Poppins', sans-serif;
  --font-body: 'Inter', sans-serif;
  
  /* Font Sizes */
  --font-size-base: 16px;
  --font-size-small: 0.875rem;
  --font-size-large: 1.125rem;
  --font-size-h1: 3rem;
  --font-size-h2: 2.5rem;
  --font-size-h3: 2rem;
  --font-size-h4: 1.5rem;
  --font-size-h5: 1.25rem;
  --font-size-h6: 1rem;
  
  /* Font Weights */
  --font-weight-regular: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  
  /* Line Heights */
  --line-height-base: 1.6;
  --line-height-heading: 1.3;
  
  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-xxl: 4rem;
  --spacing-section: 5rem;
  
  /* Layout */
  --max-width: 1200px;
  --container-padding: 1.25rem;
  --border-radius: 8px;
  --border-radius-large: 12px;
  --border-radius-small: 6px;
  
  /* Shadows */
  --shadow-small: 0 2px 4px rgba(0, 0, 0, 0.1);
  --shadow-medium: 0 4px 6px rgba(0, 0, 0, 0.1);
  --shadow-large: 0 10px 25px rgba(0, 0, 0, 0.15);
  --shadow-hover: 0 8px 20px rgba(102, 126, 234, 0.3);
  
  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-base: 0.3s ease;
  --transition-slow: 0.5s ease;
  
  /* Z-index layers */
  --z-header: 1000;
  --z-dropdown: 1100;
  --z-modal: 1200;
  --z-tooltip: 1300;
  
  /* Breakpoints (for reference in media queries) */
  --breakpoint-mobile: 640px;
  --breakpoint-tablet: 768px;
  --breakpoint-desktop: 1024px;
  --breakpoint-wide: 1440px;
}

/* Dark Mode Variables (optional for future implementation) */
@media (prefers-color-scheme: dark) {
  :root {
    --color-background: #1a1a1a;
    --color-surface: #2d2d2d;
    --color-text: #e0e0e0;
  }
}