/* ============================================
   CSS VARIABLES - BRUSSELS VIP TRANSPORT
   Premium Design System
   ============================================ */

:root {
  /* ========== COLOR PALETTE ========== */
  /* Primary Colors - Luxury Dark Theme */
  --color-primary-black: #0a0a0a;
  --color-primary-dark: #1a1a1a;
  --color-secondary-dark: #2a2a2a;
  --color-dark-grey: #3a3a3a;
  
  /* Accent Colors - Gold & Royal Blue */
  --color-gold: #d4af37;
  --color-gold-light: #e4bf47;
  --color-gold-dark: #b8941f;
  --color-royal-blue: #1e3a8a;
  --color-royal-blue-light: #3b5998;
  --color-royal-blue-dark: #0f1f4d;
  
  /* Neutral Colors */
  --color-white: #ffffff;
  --color-light-grey: #f5f5f5;
  --color-medium-grey: #8a8a8a;
  --color-border: #404040;
  
  /* Semantic Colors */
  --color-success: #10b981;
  --color-error: #ef4444;
  --color-warning: #f59e0b;
  --color-info: #3b82f6;
  
  /* Glassmorphism */
  --glass-bg: rgba(26, 26, 26, 0.7);
  --glass-border: rgba(255, 255, 255, 0.1);
  
  /* ========== TYPOGRAPHY ========== */
  /* Font Families */
  --font-heading: 'Playfair Display', serif;
  --font-body: 'Montserrat', sans-serif;
  
  /* Font Sizes */
  --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-size-6xl: 3.75rem;     /* 60px */
  --font-size-7xl: 4.5rem;      /* 72px */
  
  /* Font Weights */
  --font-weight-light: 300;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  --font-weight-black: 900;
  
  /* Line Heights */
  --line-height-tight: 1.2;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.75;
  
  /* ========== 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-max-width: 1400px;
  --container-padding: var(--space-6);
  --section-padding-y: var(--space-20);
  
  /* ========== BORDERS ========== */
  --border-radius-sm: 0.25rem;
  --border-radius-md: 0.5rem;
  --border-radius-lg: 0.75rem;
  --border-radius-xl: 1rem;
  --border-radius-2xl: 1.5rem;
  --border-radius-full: 9999px;
  
  --border-width-thin: 1px;
  --border-width-medium: 2px;
  --border-width-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);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
  --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
  --shadow-gold: 0 10px 30px rgba(212, 175, 55, 0.3);
  --shadow-blue: 0 10px 30px rgba(30, 58, 138, 0.3);
  
  /* ========== TRANSITIONS ========== */
  --transition-fast: 150ms ease-in-out;
  --transition-base: 300ms ease-in-out;
  --transition-slow: 500ms ease-in-out;
  
  /* ========== Z-INDEX LAYERS ========== */
  --z-index-negative: -1;
  --z-index-base: 0;
  --z-index-dropdown: 100;
  --z-index-sticky: 200;
  --z-index-fixed: 300;
  --z-index-modal-backdrop: 400;
  --z-index-modal: 500;
  --z-index-popover: 600;
  --z-index-tooltip: 700;
  
  /* ========== ANIMATIONS ========== */
  --animation-fade-in: fadeIn var(--transition-base);
  --animation-slide-up: slideUp var(--transition-base);
  --animation-slide-down: slideDown var(--transition-base);
  --animation-scale-up: scaleUp var(--transition-base);
  
  /* ========== BREAKPOINTS (for JS) ========== */
  --breakpoint-sm: 640px;
  --breakpoint-md: 768px;
  --breakpoint-lg: 1024px;
  --breakpoint-xl: 1280px;
  --breakpoint-2xl: 1536px;
}

/* ========== ANIMATIONS KEYFRAMES ========== */
@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes slideUp {
  from {
    transform: translateY(30px);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

@keyframes slideDown {
  from {
    transform: translateY(-30px);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

@keyframes scaleUp {
  from {
    transform: scale(0.9);
    opacity: 0;
  }
  to {
    transform: scale(1);
    opacity: 1;
  }
}

@keyframes shimmer {
  0% {
    background-position: -1000px 0;
  }
  100% {
    background-position: 1000px 0;
  }
}

@keyframes float {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-10px);
  }
}