/*
 * Cheryl Clinical UI Framework
 * Modern, accessible, clinical-styled design system
 */

/* ===== CSS Variables (Design Tokens) ===== */
:root {
  /* Clinical Color Palette */
  --color-primary: #0066CC;
  --color-primary-light: #3385DB;
  --color-primary-dark: #004C99;
  --color-secondary: #00A896;
  --color-secondary-light: #33BBA9;
  --color-secondary-dark: #008577;

  /* Neutral Colors */
  --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;

  /* Semantic Colors */
  --color-success: #10B981;
  --color-success-light: #34D399;
  --color-success-dark: #059669;
  --color-warning: #F59E0B;
  --color-warning-light: #FBBF24;
  --color-warning-dark: #D97706;
  --color-error: #EF4444;
  --color-error-light: #F87171;
  --color-error-dark: #DC2626;
  --color-info: #3B82F6;
  --color-info-light: #60A5FA;
  --color-info-dark: #2563EB;

  /* Typography */
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', 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-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;

  /* 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 */

  /* 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;

  /* Shadows */
  --shadow-xs: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-sm: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
  --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);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 200ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 300ms cubic-bezier(0.4, 0, 0.2, 1);

  /* Z-Index Scale */
  --z-dropdown: 1000;
  --z-sticky: 1020;
  --z-fixed: 1030;
  --z-modal-backdrop: 1040;
  --z-modal: 1050;
  --z-popover: 1060;
  --z-tooltip: 1070;
  --z-notification: 1080;
}

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

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

body {
  font-family: var(--font-primary);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-normal);
  line-height: var(--line-height-normal);
  color: var(--color-gray-900);
  background-color: var(--color-gray-50);
  overflow-x: hidden;
}

/* ===== Typography ===== */
h1, h2, h3, h4, h5, h6 {
  font-weight: var(--font-weight-semibold);
  line-height: var(--line-height-tight);
  color: var(--color-gray-900);
  margin-bottom: var(--spacing-md);
}

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);
  color: var(--color-gray-700);
}

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

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

a:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  background-color: var(--color-gray-100);
  padding: 0.125rem 0.375rem;
  border-radius: var(--radius-sm);
  color: var(--color-gray-800);
}

/* ===== Layout ===== */
.container {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

.container-fluid {
  width: 100%;
  padding: 0 var(--spacing-lg);
}

/* ===== Cards ===== */
.card {
  background-color: var(--color-white);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-sm);
  padding: var(--spacing-xl);
  transition: box-shadow var(--transition-base);
}

.card:hover {
  box-shadow: var(--shadow-md);
}

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

.card-title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
  color: var(--color-gray-900);
  margin: 0;
}

.card-body {
  margin-bottom: var(--spacing-lg);
}

.card-footer {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: var(--spacing-md);
  padding-top: var(--spacing-md);
  border-top: 1px solid var(--color-gray-200);
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: 0.625rem 1.25rem;
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  line-height: 1.5;
  text-align: center;
  text-decoration: none;
  white-space: nowrap;
  vertical-align: middle;
  cursor: pointer;
  user-select: none;
  border: 1px solid transparent;
  border-radius: var(--radius-lg);
  transition: all var(--transition-base);
}

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

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

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

.btn-primary:hover:not(:disabled) {
  background-color: var(--color-primary-dark);
  border-color: var(--color-primary-dark);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

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

.btn-secondary:hover:not(:disabled) {
  background-color: var(--color-secondary-dark);
  border-color: var(--color-secondary-dark);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

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

.btn-outline:hover:not(:disabled) {
  color: var(--color-white);
  background-color: var(--color-primary);
}

.btn-ghost {
  color: var(--color-gray-700);
  background-color: transparent;
  border-color: transparent;
}

.btn-ghost:hover:not(:disabled) {
  color: var(--color-gray-900);
  background-color: var(--color-gray-100);
}

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

.btn-success:hover:not(:disabled) {
  background-color: var(--color-success-dark);
  border-color: var(--color-success-dark);
}

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

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

.btn-sm {
  padding: 0.375rem 0.875rem;
  font-size: var(--font-size-sm);
}

.btn-lg {
  padding: 0.875rem 1.75rem;
  font-size: var(--font-size-lg);
}

.btn-icon {
  padding: 0.625rem;
  width: 2.5rem;
  height: 2.5rem;
}

/* ===== Forms ===== */
.form-group {
  margin-bottom: var(--spacing-lg);
}

.form-label {
  display: block;
  margin-bottom: var(--spacing-sm);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-gray-700);
}

.form-label-required::after {
  content: '*';
  color: var(--color-error);
  margin-left: var(--spacing-xs);
}

.form-control {
  display: block;
  width: 100%;
  padding: 0.625rem 0.875rem;
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-normal);
  line-height: 1.5;
  color: var(--color-gray-900);
  background-color: var(--color-white);
  background-clip: padding-box;
  border: 1px solid var(--color-gray-300);
  border-radius: var(--radius-lg);
  transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

.form-control:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(0, 102, 204, 0.1);
}

.form-control::placeholder {
  color: var(--color-gray-400);
  opacity: 1;
}

.form-control:disabled {
  background-color: var(--color-gray-100);
  opacity: 0.6;
  cursor: not-allowed;
}

.form-select {
  display: block;
  width: 100%;
  padding: 0.625rem 2.5rem 0.625rem 0.875rem;
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-normal);
  line-height: 1.5;
  color: var(--color-gray-900);
  background-color: var(--color-white);
  background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3e%3cpath fill='none' stroke='%23343a40' stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M2 5l6 6 6-6'/%3e%3c/svg%3e");
  background-repeat: no-repeat;
  background-position: right 0.75rem center;
  background-size: 16px 12px;
  border: 1px solid var(--color-gray-300);
  border-radius: var(--radius-lg);
  appearance: none;
  transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

.form-select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(0, 102, 204, 0.1);
}

.form-helper {
  display: block;
  margin-top: var(--spacing-xs);
  font-size: var(--font-size-sm);
  color: var(--color-gray-600);
}

.form-error {
  display: block;
  margin-top: var(--spacing-xs);
  font-size: var(--font-size-sm);
  color: var(--color-error);
}

.form-control.is-invalid {
  border-color: var(--color-error);
}

.form-control.is-invalid:focus {
  box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.1);
}

/* ===== Badges ===== */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 0.25rem 0.625rem;
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  line-height: 1;
  text-align: center;
  white-space: nowrap;
  vertical-align: baseline;
  border-radius: var(--radius-full);
}

.badge-primary {
  color: var(--color-primary-dark);
  background-color: rgba(0, 102, 204, 0.1);
}

.badge-success {
  color: var(--color-success-dark);
  background-color: rgba(16, 185, 129, 0.1);
}

.badge-warning {
  color: var(--color-warning-dark);
  background-color: rgba(245, 158, 11, 0.1);
}

.badge-error {
  color: var(--color-error-dark);
  background-color: rgba(239, 68, 68, 0.1);
}

.badge-info {
  color: var(--color-info-dark);
  background-color: rgba(59, 130, 246, 0.1);
}

.badge-gray {
  color: var(--color-gray-700);
  background-color: var(--color-gray-100);
}

/* ===== Alerts ===== */
.alert {
  position: relative;
  padding: var(--spacing-md) var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
  border: 1px solid transparent;
  border-radius: var(--radius-lg);
  font-size: var(--font-size-sm);
}

.alert-success {
  color: var(--color-success-dark);
  background-color: rgba(16, 185, 129, 0.1);
  border-color: var(--color-success-light);
}

.alert-warning {
  color: var(--color-warning-dark);
  background-color: rgba(245, 158, 11, 0.1);
  border-color: var(--color-warning-light);
}

.alert-error {
  color: var(--color-error-dark);
  background-color: rgba(239, 68, 68, 0.1);
  border-color: var(--color-error-light);
}

.alert-info {
  color: var(--color-info-dark);
  background-color: rgba(59, 130, 246, 0.1);
  border-color: var(--color-info-light);
}

/* ===== Loading Spinner ===== */
.spinner {
  display: inline-block;
  width: 1.5rem;
  height: 1.5rem;
  border: 2px solid var(--color-gray-200);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.spinner-sm {
  width: 1rem;
  height: 1rem;
  border-width: 2px;
}

.spinner-lg {
  width: 2.5rem;
  height: 2.5rem;
  border-width: 3px;
}

/* ===== Utility Classes ===== */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.text-primary { color: var(--color-primary); }
.text-secondary { color: var(--color-secondary); }
.text-success { color: var(--color-success); }
.text-warning { color: var(--color-warning); }
.text-error { color: var(--color-error); }
.text-muted { color: var(--color-gray-500); }

.bg-primary { background-color: var(--color-primary); }
.bg-white { background-color: var(--color-white); }
.bg-gray-50 { background-color: var(--color-gray-50); }

.d-none { display: none; }
.d-block { display: block; }
.d-flex { display: flex; }
.d-grid { display: grid; }

.flex-column { flex-direction: column; }
.flex-wrap { flex-wrap: wrap; }
.align-items-center { align-items: center; }
.justify-content-center { justify-content: center; }
.justify-content-between { justify-content: space-between; }
.justify-content-end { justify-content: flex-end; }

.gap-xs { gap: var(--spacing-xs); }
.gap-sm { gap: var(--spacing-sm); }
.gap-md { gap: var(--spacing-md); }
.gap-lg { gap: var(--spacing-lg); }
.gap-xl { gap: var(--spacing-xl); }

.mt-auto { margin-top: auto; }
.mb-0 { margin-bottom: 0; }
.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }

.w-100 { width: 100%; }
.h-100 { height: 100%; }

.rounded { border-radius: var(--radius-lg); }
.rounded-full { border-radius: var(--radius-full); }

.shadow-sm { box-shadow: var(--shadow-sm); }
.shadow-md { box-shadow: var(--shadow-md); }
.shadow-lg { box-shadow: var(--shadow-lg); }

/* ===== Responsive ===== */
@media (max-width: 768px) {
  :root {
    --font-size-4xl: 1.875rem;
    --font-size-3xl: 1.5rem;
    --font-size-2xl: 1.25rem;
  }

  .container {
    padding: 0 var(--spacing-md);
  }

  .card {
    padding: var(--spacing-lg);
  }
}

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

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

/* Reduce motion for users who prefer it */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}