/**
 * CSS Variables (Design Tokens)
 *
 * Defines colors, spacing, typography, and other design constants
 */

:root {
  /* Colors - Score System */
  --color-green: #10b981; /* Green score - positive day */
  --color-green-light: #d1fae5;
  --color-green-dark: #047857;

  --color-orange: #f59e0b; /* Orange score - neutral/mixed day */
  --color-orange-light: #fef3c7;
  --color-orange-dark: #d97706;

  --color-red: #ef4444; /* Red score - difficult day */
  --color-red-light: #fee2e2;
  --color-red-dark: #dc2626;

  /* Colors - Neutral */
  --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 - UI */
  --color-primary: #3b82f6; /* Blue - primary actions */
  --color-primary-light: #dbeafe;
  --color-primary-dark: #1e40af;

  --color-success: var(--color-green);
  --color-warning: var(--color-orange);
  --color-error: var(--color-red);

  --color-text: var(--color-gray-900);
  --color-text-secondary: var(--color-gray-600);
  --color-text-muted: var(--color-gray-400);

  --color-background: #ffffff;
  --color-background-secondary: var(--color-gray-50);
  --color-border: var(--color-gray-200);

  /* 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 */

  /* Typography */
  --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica Neue',
    Arial, sans-serif;
  --font-family-mono: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, Courier, 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: 2rem; /* 32px */
  --font-size-4xl: 2.5rem; /* 40px */

  --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;

  /* Border Radius */
  --radius-sm: 0.25rem; /* 4px */
  --radius-md: 0.375rem; /* 6px */
  --radius-lg: 0.5rem; /* 8px */
  --radius-xl: 0.75rem; /* 12px */
  --radius-2xl: 1rem; /* 16px */
  --radius-full: 9999px; /* Fully rounded */

  /* 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-normal: 250ms ease-in-out;
  --transition-slow: 350ms ease-in-out;

  /* Z-index layers */
  --z-dropdown: 1000;
  --z-modal: 2000;
  --z-toast: 3000;

  /* Breakpoints (for reference in media queries) */
  --breakpoint-sm: 640px;
  --breakpoint-md: 768px;
  --breakpoint-lg: 1024px;
  --breakpoint-xl: 1280px;

  /* Layout */
  --max-width-content: 1200px;
  --max-width-form: 480px;
  --header-height: 4rem;
}

/* Dark mode support (optional, not in MVP) */
@media (prefers-color-scheme: dark) {
  :root {
    /* Can add dark mode variables here if needed */
  }
}