/* ============================================
   KOREAN AIRLINES GUIDE - Design Tokens
   ============================================ */

:root {
  /* Colors - Dark Theme */
  --color-primary: #0EA5E9;
  --color-primary-light: #38BDF8;
  --color-primary-dark: #0284C7;
  
  --color-secondary: #F59E0B;
  --color-secondary-light: #FBBF24;
  
  --color-accent: #8B5CF6;
  --color-accent-light: #A78BFA;
  
  --color-success: #10B981;
  --color-warning: #F59E0B;
  --color-danger: #EF4444;
  
  /* Background Colors */
  --color-bg-primary: #0F172A;
  --color-bg-secondary: #1E293B;
  --color-bg-tertiary: #334155;
  --color-bg-card: rgba(30, 41, 59, 0.8);
  --color-bg-glass: rgba(30, 41, 59, 0.6);
  
  /* Text Colors */
  --color-text-primary: #F8FAFC;
  --color-text-secondary: #94A3B8;
  --color-text-tertiary: #64748B;
  --color-text-accent: #0EA5E9;
  
  /* Gradients */
  --gradient-primary: linear-gradient(135deg, #0EA5E9 0%, #8B5CF6 100%);
  --gradient-hero: linear-gradient(180deg, #0F172A 0%, #1E293B 50%, #0F172A 100%);
  --gradient-card: linear-gradient(145deg, rgba(30, 41, 59, 0.9), rgba(15, 23, 42, 0.9));
  --gradient-glow: radial-gradient(circle at 50% 50%, rgba(14, 165, 233, 0.15), transparent 70%);
  
  /* Typography */
  --font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-family-mono: 'JetBrains Mono', 'Fira Code', monospace;
  
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;
  --font-size-4xl: 2.25rem;
  --font-size-5xl: 3rem;
  --font-size-hero: clamp(2.5rem, 5vw, 4rem);
  
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  
  --line-height-tight: 1.25;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.75;
  
  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  
  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  --radius-full: 9999px;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -2px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4), 0 4px 6px -4px rgba(0, 0, 0, 0.3);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.4), 0 8px 10px -6px rgba(0, 0, 0, 0.3);
  --shadow-glow: 0 0 40px rgba(14, 165, 233, 0.3);
  --shadow-glow-lg: 0 0 60px rgba(14, 165, 233, 0.4);
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 300ms ease;
  --transition-slow: 500ms ease;
  --transition-bounce: 300ms cubic-bezier(0.34, 1.56, 0.64, 1);
  
  /* Z-Index */
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-fixed: 300;
  --z-modal-backdrop: 400;
  --z-modal: 500;
  --z-tooltip: 600;
  
  /* Container */
  --container-max: 1280px;
  --container-padding: var(--space-6);
}

/* Responsive breakpoints via media queries */
@media (max-width: 640px) {
  :root {
    --container-padding: var(--space-4);
  }
}