/* ========================================== */
/* GLOBAL DESIGN SYSTEM                      */
/* Design tokens and global styles           */
/* ========================================== */

:root {
  /* Color Palette */
  --color-primary: #3b82f6;
  --color-primary-hover: #2563eb;
  --color-secondary: #6b7280;
  --color-success: #10b981;
  --color-warning: #f59e0b;
  --color-danger: #ef4444;
  --color-info: #06b6d4;
  
  /* Grayscale */
  --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;
  
  /* Dark Theme Colors */
  --color-dark-primary: #1a1a1a;
  --color-dark-secondary: #2d2d2d;
  
  /* Spacing Scale */
  --spacing-xs: 0.25rem;   /* 4px */
  --spacing-sm: 0.5rem;    /* 8px */
  --spacing-md: 0.75rem;   /* 12px */
  --spacing-lg: 1rem;      /* 16px */
  --spacing-xl: 1.5rem;    /* 24px */
  --spacing-2xl: 2rem;     /* 32px */
  --spacing-3xl: 3rem;     /* 48px */
  
  /* Typography */
  --font-family: 'Inter', sans-serif;
  --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 Weights */
  --font-weight-light: 300;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  
  /* Border Radius */
  --radius-sm: 0.25rem;   /* 4px */
  --radius-md: 0.375rem;  /* 6px */
  --radius-lg: 0.5rem;    /* 8px */
  --radius-xl: 0.75rem;   /* 12px */
  --radius-full: 9999px;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  
  /* Transitions */
  --transition-fast: 150ms ease-in-out;
  --transition-normal: 200ms ease-in-out;
  --transition-slow: 300ms ease-in-out;
  
  /* Z-Index Scale */
  --z-dropdown: 1000;
  --z-sticky: 1020;
  --z-fixed: 1030;
  --z-modal: 1040;
  --z-popover: 1050;
  --z-tooltip: 1060;
}

/* ========================================== */
/* GLOBAL RESET AND BASE STYLES              */
/* ========================================== */

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  line-height: 1.5;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-sm);
  color: var(--color-gray-900);
  background-color: var(--color-gray-50);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.transition-all {
  transition: all var(--transition-normal);
}

.transition-colors {
  transition: color var(--transition-normal), background-color var(--transition-normal), border-color var(--transition-normal);
}

.transition-transform {
  transition: transform var(--transition-normal);
}

/* Focus styles for accessibility */
.focus-ring:focus {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* ========================================== */
/* COMPONENT BASE CLASSES                    */
/* ========================================== */

.component-container {
  position: relative;
  display: flex;
  flex-direction: column;
}

.component-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-lg);
  border-bottom: 1px solid var(--color-gray-200);
}

.component-content {
  flex: 1;
  overflow: hidden;
}

.component-footer {
  padding: var(--spacing-lg);
  border-top: 1px solid var(--color-gray-200);
}