/* ============================================
   CoreClasses Design System - CSS Variables
   ============================================ */

   :root {
    /* ===== Brand Colors ===== */
    --color-primary: #1F3C88;        /* Deep Blue */
    --color-primary-dark: #16285e;   /* Darker Blue for hover */
    --color-primary-light: #e8eef9;  /* Light Blue background */
    
    --color-secondary: #16A085;      /* Soft Teal/Green */
    --color-secondary-dark: #128a6f; /* Darker Teal */
    --color-secondary-light: #d4f4ed; /* Light Teal background */
    
    --color-accent: #F39C12;         /* Warm Orange */
    --color-accent-hover: #d68910;   /* Darker Orange */
    
    --color-success: #27AE60;        /* Green */
    --color-danger: #E74C3C;         /* Red */
    --color-warning: #F39C12;        /* Orange */
    
    /* ===== Brand Socials ===== */
    --color-youtube: #FF0000; 
    --color-youtube-hover: #cc0000;
    --color-whatsapp: #25D366; 
    --color-whatsapp-hover: #1da851; 
    
    /* ===== Neutral Colors ===== */
    --color-white: #FFFFFF;
    --color-black: #000000;
    --color-dark: #2C3E50;           /* Main Heading Color */
    --color-gray-100: #F5F7FA;       /* Page Backgrounds */
    --color-gray-200: #E8ECF1;       /* Borders */
    --color-gray-300: #CED4DA;       /* Disabled Inputs */
    --color-gray-400: #8B95A5;       /* Icons */
    --color-gray-500: #6C757D;       /* Subtitles */
    --color-gray-600: #495057;       /* Body Text */
    
    /* ===== Typography ===== */
    --font-heading: 'Poppins', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    
    --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-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    
    --line-height-tight: 1.2;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.75;
    
    /* ===== Spacing ===== */
    --spacing-xs: 0.25rem;   /* 4px */
    --spacing-sm: 0.5rem;    /* 8px */
    --spacing-md: 1rem;      /* 16px */
    --spacing-lg: 1.5rem;    /* 24px */
    --spacing-xl: 2rem;      /* 32px */
    --spacing-2xl: 3rem;     /* 48px */
    --spacing-3xl: 4rem;     /* 64px */
    --spacing-4xl: 6rem;     /* 96px */
    
    /* ===== 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;   /* Pills/Circles */
    
    /* ===== 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);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    
    /* ===== Transitions ===== */
    --transition-fast: 150ms ease-in-out;
    --transition-base: 300ms ease-in-out;
    
    /* ===== Z-Index Layers ===== */
    --z-dropdown: 1000;
    --z-sticky: 1020;
    --z-fixed: 1030;
    --z-modal: 1050;
  }
  
  /* ===== Global Resets ===== */
  * {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }
  
  html {
    scroll-behavior: smooth;
  }
  
  /* Accessibility: Disable smooth scroll if user prefers reduced motion */
  @media (prefers-reduced-motion: reduce) {
    html {
      scroll-behavior: auto;
    }
  }
  
  body {
    font-family: var(--font-body);
    font-size: var(--font-size-base);
    line-height: var(--line-height-normal);
    color: var(--color-dark);
    background-color: var(--color-white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
  }
  
  h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: var(--font-weight-bold);
    line-height: var(--line-height-tight);
    color: var(--color-dark);
    margin-bottom: var(--spacing-md);
  }
  
  /* Responsive Headings */
  h1 { font-size: var(--font-size-5xl); }
  h2 { font-size: var(--font-size-4xl); }
  h3 { font-size: var(--font-size-3xl); }
  h4 { font-size: var(--font-size-2xl); }
  
  p {
    margin-bottom: var(--spacing-md);
    color: var(--color-gray-600);
  }
  
  a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
  }
  
  a:hover {
    color: var(--color-primary-dark);
  }
  
  img {
    max-width: 100%;
    height: auto;
    display: block;
  }
  
  /* ===== Utility Classes ===== */
  .container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
  }
  
  .section { padding: var(--spacing-4xl) 0; }
  .section-sm { padding: var(--spacing-3xl) 0; }
  .text-center { text-align: center; }
  
  .text-primary { color: var(--color-primary); }
  .text-secondary { color: var(--color-secondary); }
  .bg-light { background-color: var(--color-gray-100); }
  .bg-white { background-color: var(--color-white); }

  /* ===== Screen Reader Only (CRITICAL FOR SEO) ===== */
  .sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
  }