/* CSS Custom Properties (Design Tokens) */

:root {
  /* Colors - Base */
  --color-white: #ffffff;
  --color-black: #0a0a0a;
  --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;

  /* Colors - Brand (Mountain/Nature inspired) */
  --color-primary: #059669; /* Alpine forest green */
  --color-primary-dark: #047857;
  --color-primary-light: #34d399;

  /* Colors - Semantic */
  --color-success: #16a34a;
  --color-success-dark: #15803d;
  --color-success-light: #4ade80;
  --color-success-bg: #dcfce7;

  --color-danger: #dc2626;
  --color-danger-dark: #b91c1c;
  --color-danger-light: #f87171;
  --color-danger-bg: #fee2e2;

  --color-warning: #ea580c;
  --color-warning-dark: #c2410c;
  --color-warning-light: #fb923c;
  --color-warning-bg: #ffedd5;

  --color-info: #0891b2;
  --color-info-dark: #0e7490;
  --color-info-light: #22d3ee;
  --color-info-bg: #cffafe;

  /* Colors - Neutral Semantic */
  --color-neutral: var(--color-gray-500);
  --color-neutral-dark: var(--color-gray-700);
  --color-neutral-light: var(--color-gray-300);
  --color-neutral-bg: var(--color-gray-100);

  /* Typography */
  --font-sans: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'IBM Plex Mono', 'Courier New', monospace;

  --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: 4rem;      /* 64px */

  --font-weight-normal: 400;
  --font-weight-medium: 600;
  --font-weight-bold: 700;

  --line-height-tight: 1.1;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.75;

  /* Spacing */
  --space-xs: 0.25rem;    /* 4px */
  --space-sm: 0.5rem;     /* 8px */
  --space-md: 1rem;       /* 16px */
  --space-lg: 1.5rem;     /* 24px */
  --space-xl: 2rem;       /* 32px */
  --space-2xl: 3rem;      /* 48px */
  --space-3xl: 4rem;      /* 64px */
  --space-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-full: 9999px;

  /* 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), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);

  /* Transitions */
  --transition-fast: 150ms ease-in-out;
  --transition-base: 250ms ease-in-out;
  --transition-slow: 350ms ease-in-out;

  /* Z-index */
  --z-base: 1;
  --z-dropdown: 10;
  --z-modal: 100;
  --z-toast: 1000;

  /* Layout */
  --container-max-width: 1200px;
  --container-padding: var(--space-md);
}

@media (min-width: 768px) {
  :root {
    --container-padding: var(--space-xl);
  }
}