/* Calculate RPE - Base Styles */

/* Essential CSS Variables (complementing modern.css) */
:root {
  /* Legacy color aliases for backward compatibility */
  --primary-color: var(--primary-600);
  --primary-dark: var(--primary-700);
  --primary-light: var(--primary-500);
  --secondary-color: var(--gray-500);
  --accent-color: var(--success-500);
  --warning-color: var(--warning-500);
  --error-color: var(--error-500);
  --success-color: var(--success-500);
  
  /* Legacy spacing aliases */
  --spacing-xs: var(--space-1);
  --spacing-sm: var(--space-2);
  --spacing-md: var(--space-4);
  --spacing-lg: var(--space-6);
  --spacing-xl: var(--space-8);
  --spacing-2xl: var(--space-12);
  --spacing-3xl: var(--space-16);
  
  /* Legacy typography aliases */
  --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-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;
  
  /* Legacy radius aliases */
  --radius-sm: 0.25rem;
  --radius-md: 0.375rem;
  --radius-lg: 0.5rem;
  --radius-xl: 0.75rem;
  --radius-full: 9999px;
  
  /* Legacy transition aliases */
  --transition-fast: var(--transition-fast);
  --transition-normal: var(--transition-base);
  --transition-slow: var(--transition-slow);
  
  /* Z-Index */
  --z-dropdown: 1000;
  --z-sticky: 1020;
  --z-fixed: 1030;
  --z-modal-backdrop: 1040;
  --z-modal: 1050;
  --z-popover: 1060;
  --z-tooltip: 1070;
  --z-toast: 1080;
  
  /* Breakpoints (for reference in JS) */
  --breakpoint-sm: 640px;
  --breakpoint-md: 768px;
  --breakpoint-lg: 1024px;
  --breakpoint-xl: 1280px;
  --breakpoint-2xl: 1536px;
}

/* Reset and Base Styles */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  line-height: 1.5;
  -webkit-text-size-adjust: 100%;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family-sans);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-normal);
  line-height: var(--line-height-normal);
  color: var(--gray-900);
  background-color: var(--gray-50);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: var(--font-weight-semibold);
  line-height: var(--line-height-tight);
  margin-bottom: var(--spacing-sm);
}

h1 { font-size: var(--font-size-4xl); }
h2 { font-size: var(--font-size-3xl); }
h3 { font-size: var(--font-size-2xl); }
h4 { font-size: var(--font-size-xl); }
h5 { font-size: var(--font-size-lg); }
h6 { font-size: var(--font-size-base); }

p {
  margin-bottom: var(--spacing-md);
}

a {
  color: var(--primary-color);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover,
a:focus {
  color: var(--primary-dark);
  text-decoration: underline;
}

/* Highlighted link utilities */
.highlight-link {
  background: color-mix(in srgb, var(--primary-600) 10%, transparent);
  color: var(--primary-700);
  padding: 2px 8px;
  border-radius: 6px;
  text-decoration: none;
  display: inline-block;
}

.highlight-link:hover,
.highlight-link:focus {
  background: color-mix(in srgb, var(--primary-600) 16%, transparent);
  color: var(--primary-800);
  text-decoration: none;
}

.highlight-link--small {
  padding: 0 6px;
  border-radius: 6px;
}

.highlight-link--pill {
  border-radius: 999px;
}

/* Legacy Button Styles (for backward compatibility) */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-sm) var(--spacing-md);
  font-family: inherit;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  line-height: var(--line-height-tight);
  text-align: center;
  text-decoration: none;
  white-space: nowrap;
  background-color: transparent;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-md);
  color: var(--gray-900);
  cursor: pointer;
  transition: all var(--transition-fast);
  user-select: none;
  -webkit-user-select: none;
  touch-action: manipulation;
  min-height: 44px;
}

.btn:hover {
  background-color: var(--gray-100);
}

.btn:focus {
  outline: 2px solid var(--primary-color);
  outline-offset: 2px;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}

.btn-primary {
  background-color: var(--primary-color);
  border-color: var(--primary-color);
  color: white;
}

.btn-primary:hover {
  background-color: var(--primary-dark);
  border-color: var(--primary-dark);
}

.btn-secondary {
  background-color: var(--gray-100);
  border-color: var(--gray-300);
  color: var(--gray-900);
}

.btn-secondary:hover {
  background-color: var(--gray-200);
}

/* Essential Form Elements */
input, select, textarea {
  font-family: inherit;
  font-size: var(--font-size-base);
  line-height: var(--line-height-normal);
}

/* Validation Error Messages */
.validation-error {
  margin-top: var(--spacing-xs);
  padding: var(--spacing-xs) var(--spacing-sm);
  background-color: rgba(220, 38, 38, 0.1);
  border: 1px solid var(--error-color);
  border-radius: var(--radius-sm);
  color: var(--error-color);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  animation: fadeIn 0.2s ease-out;
}

/* Essential 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;
}

.hidden { display: none !important; }
.invisible { visibility: hidden; }
.visible { visibility: visible; }

/* Skip to main content link */
.skip-link {
  position: absolute;
  top: -40px;
  left: 6px;
  background: var(--primary-color);
  color: white;
  padding: 8px;
  text-decoration: none;
  border-radius: 4px;
  z-index: 1000;
  font-weight: var(--font-weight-medium);
}

.skip-link:focus {
  top: 6px;
}

/* Accessibility Support */
@media (prefers-contrast: high) {
  :root {
    --gray-200: #000;
    --gray-900: #000;
    --gray-600: #000;
    --gray-50: #fff;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* Essential Animations */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Print Styles */
@media print {
  * {
    print-color-adjust: exact;
    -webkit-print-color-adjust: exact;
  }
  
  body {
    background: white;
    color: black;
  }
  
  .no-print {
    display: none !important;
  }
}