/* ============================================
   CSS Custom Properties - Design System
   ============================================ */

:root {
  /* ===== Colors ===== */
  /* Primary */
  --color-primary: #27374E;
  --color-primary-light: #3A4D6B;
  --color-primary-dark: #1C2838;

  /* Secondary */
  --color-secondary: #7c3aed;
  --color-secondary-light: #a78bfa;
  --color-secondary-dark: #5b21b6;

  /* Accent */
  --color-accent: #f59e0b;
  --color-accent-light: #fbbf24;
  --color-accent-dark: #d97706;

  /* Neutrals */
  --color-text-primary: #1f2937;
  --color-text-secondary: #6b7280;
  --color-text-tertiary: #9ca3af;
  --color-background: #ffffff;
  --color-surface: #f9fafb;
  --color-surface-dark: #f3f4f6;
  --color-border: #e5e7eb;

  /* Semantic Colors */
  --color-error: #ef4444;
  --color-error-light: #fca5a5;
  --color-success: #10b981;
  --color-success-light: #6ee7b7;
  --color-warning: #f59e0b;
  --color-info: #3b82f6;

  /* ===== Typography ===== */
  --font-primary: 'Segoe UI', system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  --font-heading: 'Segoe UI', system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'Consolas', 'Monaco', 'Courier New', monospace;

  /* 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 Weights */
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;

  /* Line Heights */
  --line-height-tight: 1.25;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.75;
  --line-height-loose: 2;

  /* ===== 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 */
  --spacing-4xl: 6rem;          /* 96px */
  --spacing-5xl: 8rem;          /* 128px */

  /* ===== Layout ===== */
  --container-max-width: 1200px;
  --container-padding: var(--spacing-lg);
  --section-padding-y: var(--spacing-4xl);

  /* ===== Border Radius ===== */
  --border-radius-sm: 0.25rem;   /* 4px */
  --border-radius-md: 0.5rem;    /* 8px */
  --border-radius-lg: 1rem;      /* 16px */
  --border-radius-xl: 1.5rem;    /* 24px */
  --border-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);
  --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);

  /* ===== Transitions ===== */
  --transition-fast: 150ms ease-in-out;
  --transition-base: 250ms ease-in-out;
  --transition-slow: 350ms ease-in-out;
  --transition-slower: 500ms ease-in-out;

  /* 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);

  /* ===== Z-Index Layers ===== */
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-fixed: 300;
  --z-modal-backdrop: 400;
  --z-modal: 500;
  --z-tooltip: 600;

  /* ===== Breakpoints (for JS) ===== */
  --breakpoint-mobile: 480px;
  --breakpoint-tablet: 768px;
  --breakpoint-desktop: 1024px;
  --breakpoint-wide: 1280px;
}