/**
 * MODERN DESIGN SYSTEM - ELEPHANT TRAVEL 2025
 * Variables for consistent design across the website
 */

:root {
  /* ========== COLOR PALETTE ========== */

  /* Primary Colors - Blue Ocean Theme */
  --color-primary: #0088c6;
  --color-primary-light: #00a8e8;
  --color-primary-dark: #006ba1;
  --color-primary-rgb: 0, 136, 198;

  /* Secondary Colors - Warm Accent */
  --color-secondary: #ff6b35;
  --color-secondary-light: #ff8c61;
  --color-secondary-dark: #e65a2e;

  /* Success, Warning, Error */
  --color-success: #10b981;
  --color-warning: #f59e0b;
  --color-error: #ef4444;
  --color-info: #3b82f6;

  /* Neutral Colors */
  --color-white: #ffffff;
  --color-gray-50: #f9fafb;
  --color-gray-100: #f3f4f6;
  --color-gray-200: #e5e7eb;
  --color-gray-300: #d1d5db;
  --color-gray-400: #9ca3af;
  --color-gray-500: #6b7280;
  --color-gray-600: #4b5563;
  --color-gray-700: #374151;
  --color-gray-800: #1f2937;
  --color-gray-900: #111827;
  --color-black: #000000;

  /* Text Colors */
  --color-text-primary: #1f2937;
  --color-text-secondary: #6b7280;
  --color-text-tertiary: #9ca3af;
  --color-text-inverse: #ffffff;

  /* Background Colors */
  --color-bg-primary: #ffffff;
  --color-bg-secondary: #f9fafb;
  --color-bg-tertiary: #f3f4f6;
  --color-bg-overlay: rgba(0, 0, 0, 0.5);

  /* ========== TYPOGRAPHY ========== */

  /* Font Families */
  --font-primary: 'Roboto', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-heading: 'Roboto', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'SF Mono', Monaco, 'Cascadia Code', monospace;

  /* Font Sizes - Fluid Typography */
  --font-size-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
  --font-size-sm: clamp(0.875rem, 0.8rem + 0.3vw, 1rem);
  --font-size-base: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
  --font-size-lg: clamp(1.125rem, 1.05rem + 0.35vw, 1.25rem);
  --font-size-xl: clamp(1.25rem, 1.15rem + 0.5vw, 1.5rem);
  --font-size-2xl: clamp(1.5rem, 1.35rem + 0.75vw, 1.875rem);
  --font-size-3xl: clamp(1.875rem, 1.65rem + 1.125vw, 2.25rem);
  --font-size-4xl: clamp(2.25rem, 1.95rem + 1.5vw, 3rem);
  --font-size-5xl: clamp(3rem, 2.5rem + 2.5vw, 4rem);

  /* Font Weights */
  --font-weight-light: 300;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  --font-weight-extrabold: 800;

  /* Line Heights */
  --line-height-none: 1;
  --line-height-tight: 1.25;
  --line-height-snug: 1.375;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.625;
  --line-height-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 */
  --space-32: 8rem;     /* 128px */

  /* ========== BORDERS ========== */

  /* Border Radius */
  --radius-none: 0;
  --radius-sm: 0.25rem;
  --radius-base: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  --radius-3xl: 2rem;
  --radius-full: 9999px;

  /* Border Width */
  --border-width-0: 0;
  --border-width-1: 1px;
  --border-width-2: 2px;
  --border-width-4: 4px;

  /* ========== SHADOWS ========== */

  --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px -1px rgba(0, 0, 0, 0.1);
  --shadow-base: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
  --shadow-2xl: 0 35px 60px -15px rgba(0, 0, 0, 0.3);
  --shadow-inner: inset 0 2px 4px 0 rgba(0, 0, 0, 0.05);

  /* Colored Shadows */
  --shadow-primary: 0 10px 25px -5px rgba(var(--color-primary-rgb), 0.3);
  --shadow-secondary: 0 10px 25px -5px rgba(255, 107, 53, 0.3);

  /* ========== TRANSITIONS ========== */

  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slower: 500ms cubic-bezier(0.4, 0, 0.2, 1);

  /* Easing Functions */
  --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-bounce: cubic-bezier(0.68, -0.55, 0.265, 1.55);

  /* ========== Z-INDEX ========== */

  --z-negative: -1;
  --z-base: 0;
  --z-dropdown: 1000;
  --z-sticky: 1020;
  --z-fixed: 1030;
  --z-modal-backdrop: 1040;
  --z-modal: 1050;
  --z-popover: 1060;
  --z-tooltip: 1070;
  --z-notification: 1080;

  /* ========== BREAKPOINTS (for reference in JS) ========== */

  --breakpoint-sm: 576px;
  --breakpoint-md: 768px;
  --breakpoint-lg: 992px;
  --breakpoint-xl: 1200px;
  --breakpoint-2xl: 1400px;

  /* ========== LAYOUT ========== */

  --container-sm: 540px;
  --container-md: 720px;
  --container-lg: 960px;
  --container-xl: 1140px;
  --container-2xl: 1320px;

  /* ========== EFFECTS ========== */

  /* Glassmorphism */
  --glass-bg: rgba(255, 255, 255, 0.8);
  --glass-border: rgba(255, 255, 255, 0.2);
  --glass-blur: blur(10px);

  /* Gradients */
  --gradient-primary: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  --gradient-secondary: linear-gradient(135deg, var(--color-secondary) 0%, var(--color-secondary-dark) 100%);
  --gradient-sunset: linear-gradient(135deg, #ff6b35 0%, #f7931e 50%, #ffc837 100%);
  --gradient-ocean: linear-gradient(135deg, #0088c6 0%, #00a8e8 50%, #4fc3f7 100%);
  --gradient-overlay: linear-gradient(180deg, rgba(0, 0, 0, 0) 0%, rgba(0, 0, 0, 0.7) 100%);

  /* ========== ANIMATION DURATIONS ========== */

  --duration-instant: 0ms;
  --duration-fast: 150ms;
  --duration-base: 250ms;
  --duration-slow: 350ms;
  --duration-slower: 500ms;
  --duration-slowest: 1000ms;
}

/* ========== DARK MODE SUPPORT ========== */

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg-primary: #111827;
    --color-bg-secondary: #1f2937;
    --color-bg-tertiary: #374151;
    --color-text-primary: #f9fafb;
    --color-text-secondary: #d1d5db;
    --color-text-tertiary: #9ca3af;
  }
}

[data-theme="dark"] {
  --color-bg-primary: #111827;
  --color-bg-secondary: #1f2937;
  --color-bg-tertiary: #374151;
  --color-text-primary: #f9fafb;
  --color-text-secondary: #d1d5db;
  --color-text-tertiary: #9ca3af;
  --glass-bg: rgba(31, 41, 55, 0.8);
  --glass-border: rgba(255, 255, 255, 0.1);
}

/* ========== UTILITY CLASSES ========== */

/* Animations */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeInDown {
  from {
    opacity: 0;
    transform: translateY(-20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

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

@keyframes scaleIn {
  from {
    opacity: 0;
    transform: scale(0.95);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

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

@keyframes pulse {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.5;
  }
}

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

/* ========== PRINT STYLES ========== */

@media print {
  :root {
    --color-text-primary: #000000;
    --color-bg-primary: #ffffff;
  }
}