/* ============================================================================
   MODERN UI/UX DESIGN SYSTEM
   ============================================================================ */

/* ============================================================================
   1. ROOT VARIABLES & COLOR PALETTE
   ============================================================================ */
:root {
  /* Primary Colors */
  --primary: #0052cc;
  --primary-light: #0066ff;
  --primary-dark: #003d99;
  --primary-rgb: 0, 82, 204;

  /* Secondary Colors */
  --secondary: #6c757d;
  --secondary-light: #848d96;
  --secondary-dark: #545a5f;

  /* Semantic Colors */
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
  --info: #3b82f6;

  /* Neutral Colors */
  --white: #ffffff;
  --gray-50: #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-400: #9ca3af;
  --gray-500: #6b7280;
  --gray-600: #4b5563;
  --gray-700: #374151;
  --gray-800: #1f2937;
  --gray-900: #111827;
  --black: #000000;

  /* Dark Mode */
  --dark-bg: #0f172a;
  --dark-surface: #1e293b;
  --dark-surface-light: #334155;
  --dark-text: #f1f5f9;
  --dark-text-secondary: #cbd5e1;

  /* Spacing Scale */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 2.5rem;
  --spacing-3xl: 3rem;

  /* Typography */
  --font-family-base: -apple-system, BlinkMacSystemFont, "Segoe UI", "Source Sans Pro", Calibra, Candara, Arial, sans-serif;
  --font-family-mono: "Courier New", monospace;
  --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;

  /* Line Heights */
  --line-height-tight: 1.2;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.75;

  /* Letter Spacing */
  --tracking-tight: -0.01em;
  --tracking-normal: 0;
  --tracking-wide: 0.025em;

  /* Border Radius */
  --radius-none: 0;
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-none: none;
  --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.1);
  --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 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-hide: -1;
  --z-base: 0;
  --z-dropdown: 1000;
  --z-sticky: 1020;
  --z-fixed: 1030;
  --z-modal-backdrop: 1040;
  --z-modal: 1050;
  --z-popover: 1060;
  --z-tooltip: 1070;
}

/* Dark Mode Variables */
body.inverted {
  --page-bg: var(--dark-bg);
  --page-text: var(--dark-text);
  --page-text-secondary: var(--dark-text-secondary);
  --surface: var(--dark-surface);
  --surface-light: var(--dark-surface-light);
  --border-color: var(--gray-700);
}

/* Light Mode Variables */
body:not(.inverted) {
  --page-bg: var(--white);
  --page-text: var(--gray-900);
  --page-text-secondary: var(--gray-600);
  --surface: var(--gray-50);
  --surface-light: var(--gray-100);
  --border-color: var(--gray-200);
}

/* ============================================================================
   2. RESET & BASE STYLES
   ============================================================================ */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family-base);
  font-size: var(--font-size-base);
  line-height: var(--line-height-normal);
  color: var(--page-text);
  background-color: var(--page-bg);
  transition: background-color var(--transition-base), color var(--transition-base);
  margin-bottom: 60px;
}

/* ============================================================================
   3. TYPOGRAPHY
   ============================================================================ */
h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: var(--line-height-tight);
  margin-bottom: var(--spacing-md);
  color: var(--page-text);
}

h1 {
  font-size: var(--font-size-4xl);
  letter-spacing: var(--tracking-tight);
}

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);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: var(--tracking-wide);
}

p {
  margin-bottom: var(--spacing-md);
  color: var(--page-text-secondary);
  line-height: var(--line-height-relaxed);
}

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

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

a:focus {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

/* Code */
code {
  font-family: var(--font-family-mono);
  font-size: 0.9em;
  background-color: var(--surface-light);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-sm);
  color: var(--danger);
}

/* ============================================================================
   4. FORMS & INPUTS
   ============================================================================ */
input,
select,
textarea,
button {
  font-family: var(--font-family-base);
  font-size: var(--font-size-base);
}

input,
select,
textarea {
  width: 100%;
  padding: var(--spacing-md);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background-color: var(--page-bg);
  color: var(--page-text);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast), background-color var(--transition-fast);
}

input:hover,
select:hover,
textarea:hover {
  border-color: var(--gray-400);
}

input:focus,
select:focus,
textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(var(--primary-rgb), 0.1);
}

input:disabled,
select:disabled,
textarea:disabled {
  background-color: var(--surface-light);
  opacity: 0.6;
  cursor: not-allowed;
}

/* Placeholder */
input::placeholder,
textarea::placeholder {
  color: var(--gray-400);
}

/* Select Arrow */
select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23333' d='M6 9L1 4h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right var(--spacing-md) center;
  padding-right: 2.5rem;
}

/* Fix select.form-control text clipping (Bootstrap height + large padding conflict) */
select.form-control {
  height: auto;
  padding: 0.5rem 2.5rem 0.5rem 0.75rem;
}

/* Checkboxes */
input[type="checkbox"],
input[type="radio"] {
  width: auto;
  height: auto;
  appearance: none;
  cursor: pointer;
  padding: 0;
}

input[type="checkbox"] {
  width: 1.25rem;
  height: 1.25rem;
  border: 2px solid var(--gray-400);
  border-radius: var(--radius-sm);
  background-color: var(--page-bg);
  transition: all var(--transition-fast);
  position: relative;
}

input[type="checkbox"]:hover {
  border-color: var(--primary);
}

input[type="checkbox"]:checked {
  background-color: var(--primary);
  border-color: var(--primary);
}

input[type="checkbox"]:checked::after {
  content: '✓';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  color: var(--white);
  font-size: 0.875rem;
  font-weight: bold;
}

/* ============================================================================
   5. BUTTONS
   ============================================================================ */
button,
.btn,
input[type="submit"],
input[type="button"],
input[type="reset"] {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md) var(--spacing-lg);
  font-size: var(--font-size-base);
  font-weight: 600;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
  white-space: nowrap;
  user-select: none;
  -webkit-user-select: none;
}

/* Button Variants */
.btn-primary,
button.btn-primary,
input[type="submit"] {
  background-color: var(--primary);
  color: var(--white);
}

.btn-primary:hover,
button.btn-primary:hover,
input[type="submit"]:hover {
  background-color: var(--primary-dark);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-primary:active {
  transform: translateY(0);
  box-shadow: var(--shadow-sm);
}

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

.btn-secondary:hover {
  background-color: var(--secondary-dark);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-outline {
  background-color: transparent;
  color: var(--primary);
  border: 2px solid var(--primary);
}

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

.btn-ghost {
  background-color: transparent;
  color: var(--page-text);
  border: 1px solid var(--border-color);
}

.btn-ghost:hover {
  background-color: var(--surface-light);
  border-color: var(--gray-400);
}

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

.btn-success:hover {
  background-color: #059669;
}

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

.btn-danger:hover {
  background-color: #dc2626;
}

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

.btn-warning:hover {
  background-color: #d97706;
}

/* Button Sizes */
.btn-sm {
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: var(--font-size-sm);
}

.btn-lg {
  padding: var(--spacing-lg) var(--spacing-2xl);
  font-size: var(--font-size-lg);
}

.btn-block {
  width: 100%;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none !important;
}

/* ============================================================================
   6. CARDS & CONTAINERS
   ============================================================================ */
.card {
  background-color: var(--surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-base);
}

.card:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--gray-300);
}

.card-header {
  padding: var(--spacing-lg);
  border-bottom: 1px solid var(--border-color);
  margin: calc(-1 * var(--spacing-lg)) calc(-1 * var(--spacing-lg)) var(--spacing-lg);
}

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

.card-footer {
  padding: var(--spacing-lg);
  border-top: 1px solid var(--border-color);
  margin: var(--spacing-lg) calc(-1 * var(--spacing-lg)) calc(-1 * var(--spacing-lg));
}

/* Alert / Banner */
.alert {
  padding: var(--spacing-lg);
  border-radius: var(--radius-md);
  border-left: 4px solid;
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-md);
  animation: slideInDown var(--transition-slow);
}

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

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

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

.alert-danger {
  background-color: rgba(239, 68, 68, 0.1);
  border-color: var(--danger);
  color: var(--page-text);
}

.alert-close {
  cursor: pointer;
  font-weight: bold;
  opacity: 0.7;
  transition: opacity var(--transition-fast);
}

.alert-close:hover {
  opacity: 1;
}

/* ============================================================================
   7. TABLES
   ============================================================================ */
.table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: var(--spacing-lg);
  font-size: var(--font-size-sm);
}

.table thead {
  background-color: var(--surface-light);
  border-bottom: 2px solid var(--border-color);
}

.table th {
  padding: var(--spacing-md);
  text-align: left;
  font-weight: 600;
  color: var(--page-text);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wide);
  font-size: var(--font-size-xs);
}

.table td {
  padding: var(--spacing-md);
  border-bottom: 1px solid var(--border-color);
  vertical-align: middle;
}

.table tbody tr {
  transition: background-color var(--transition-fast);
}

.table tbody tr:hover {
  background-color: var(--surface-light);
}

.table tbody tr:last-child td {
  border-bottom: none;
}

.table-striped tbody tr:nth-child(odd) {
  background-color: var(--surface-light);
}

.table-striped tbody tr:nth-child(odd):hover {
  background-color: var(--gray-200);
}

/* ============================================================================
   8. PAGINATION
   ============================================================================ */
.pagination {
  display: flex;
  list-style: none;
  gap: var(--spacing-xs);
  margin: var(--spacing-lg) 0;
}

.pagination li {
  display: inline-block;
}

.pagination a,
.pagination span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--primary);
  text-decoration: none;
  transition: all var(--transition-fast);
  font-weight: 500;
}

.pagination a:hover {
  background-color: var(--primary);
  color: var(--white);
  border-color: var(--primary);
}

.pagination .active span {
  background-color: var(--primary);
  color: var(--white);
  border-color: var(--primary);
}

.pagination .disabled span {
  color: var(--gray-400);
  cursor: not-allowed;
}

/* ============================================================================
   9. UTILITIES
   ============================================================================ */
/* Spacing Utilities */
.mb-1 { margin-bottom: var(--spacing-sm); }
.mb-2 { margin-bottom: var(--spacing-md); }
.mb-3 { margin-bottom: var(--spacing-lg); }
.mb-4 { margin-bottom: var(--spacing-xl); }
.mb-5 { margin-bottom: var(--spacing-2xl); }

.mt-1 { margin-top: var(--spacing-sm); }
.mt-2 { margin-top: var(--spacing-md); }
.mt-3 { margin-top: var(--spacing-lg); }
.mt-4 { margin-top: var(--spacing-xl); }
.mt-5 { margin-top: var(--spacing-2xl); }

.p-1 { padding: var(--spacing-sm); }
.p-2 { padding: var(--spacing-md); }
.p-3 { padding: var(--spacing-lg); }
.p-4 { padding: var(--spacing-xl); }
.p-5 { padding: var(--spacing-2xl); }

/* Text Utilities */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.text-muted { color: var(--gray-500); }
.text-success { color: var(--success); }
.text-danger { color: var(--danger); }
.text-warning { color: var(--warning); }
.text-info { color: var(--info); }

.font-bold { font-weight: 700; }
.font-semibold { font-weight: 600; }
.font-normal { font-weight: 400; }

/* Display Utilities */
.d-none { display: none; }
.d-block { display: block; }
.d-inline { display: inline; }
.d-inline-block { display: inline-block; }
.d-flex { display: flex; }
.d-grid { display: grid; }

.flex-center { display: flex; align-items: center; justify-content: center; }
.flex-between { display: flex; align-items: center; justify-content: space-between; }
.flex-col { flex-direction: column; }
.flex-wrap { flex-wrap: wrap; }
.gap-1 { gap: var(--spacing-sm); }
.gap-2 { gap: var(--spacing-md); }
.gap-3 { gap: var(--spacing-lg); }

/* Border Utilities */
.border { border: 1px solid var(--border-color); }
.border-top { border-top: 1px solid var(--border-color); }
.border-bottom { border-bottom: 1px solid var(--border-color); }
.border-left { border-left: 4px solid var(--primary); }
.border-right { border-right: 1px solid var(--border-color); }
.rounded { border-radius: var(--radius-md); }
.rounded-lg { border-radius: var(--radius-lg); }
.rounded-full { border-radius: var(--radius-full); }

/* Shadow Utilities */
.shadow-none { box-shadow: var(--shadow-none); }
.shadow-xs { box-shadow: var(--shadow-xs); }
.shadow-sm { box-shadow: var(--shadow-sm); }
.shadow-md { box-shadow: var(--shadow-md); }
.shadow-lg { box-shadow: var(--shadow-lg); }
.shadow-xl { box-shadow: var(--shadow-xl); }

/* Background Utilities */
.bg-primary { background-color: var(--primary); color: var(--white); }
.bg-secondary { background-color: var(--secondary); color: var(--white); }
.bg-success { background-color: var(--success); color: var(--white); }
.bg-danger { background-color: var(--danger); color: var(--white); }
.bg-warning { background-color: var(--warning); color: var(--white); }
.bg-info { background-color: var(--info); color: var(--white); }
.bg-light { background-color: var(--surface-light); }
.bg-white { background-color: var(--white); }

/* Opacity Utilities */
.opacity-50 { opacity: 0.5; }
.opacity-75 { opacity: 0.75; }

/* ============================================================================
   10. ANIMATIONS & TRANSITIONS
   ============================================================================ */
@keyframes slideInDown {
  from {
    transform: translateY(-20px);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

@keyframes slideInUp {
  from {
    transform: translateY(20px);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes pulse {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.5;
  }
}

@keyframes spin {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

.animate-pulse { animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite; }
.animate-spin { animation: spin 1s linear infinite; }
.animate-slideInDown { animation: slideInDown var(--transition-slow); }
.animate-slideInUp { animation: slideInUp var(--transition-slow); }

/* ============================================================================
   11. RESPONSIVE DESIGN
   ============================================================================ */
@media (max-width: 1200px) {
  .container {
    max-width: 1140px;
  }
}

@media (max-width: 992px) {
  .container {
    max-width: 960px;
  }

  h1 { font-size: var(--font-size-3xl); }
  h2 { font-size: var(--font-size-2xl); }
  h3 { font-size: var(--font-size-xl); }
}

@media (max-width: 768px) {
  html {
    font-size: 14px;
  }

  .container {
    max-width: 720px;
  }

  .d-md-none { display: none; }
  .d-md-block { display: block; }

  .table {
    font-size: var(--font-size-xs);
  }

  .table th,
  .table td {
    padding: var(--spacing-sm);
  }
}

@media (max-width: 576px) {
  .container {
    max-width: 100%;
    padding: 0 var(--spacing-md);
  }

  .d-sm-none { display: none; }
  .d-sm-block { display: block; }

  h1 { font-size: var(--font-size-2xl); }
  h2 { font-size: var(--font-size-xl); }
  h3 { font-size: var(--font-size-lg); }

  .btn {
    padding: var(--spacing-md) var(--spacing-md);
    font-size: var(--font-size-sm);
  }

  .alert {
    flex-direction: column;
  }
}

/* ============================================================================
   12. PRINT STYLES
   ============================================================================ */
@media print {
  body {
    background-color: var(--white);
    color: var(--black);
  }

  .btn,
  .link-button,
  button {
    border: 1px solid var(--black);
  }

  .shadow-lg,
  .shadow-md,
  .shadow-sm {
    box-shadow: none;
  }
}

/* ============================================================================
   13. TOGGLE SWITCH
   ============================================================================ */

.toggle-switch {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  background: var(--gray-50, #f8f9fa);
  border: 1px solid var(--gray-200, #e9ecef);
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s ease;
  user-select: none;
}

.toggle-switch:hover {
  background: var(--gray-100, #f1f3f5);
  border-color: var(--gray-300, #dee2e6);
}

.toggle-switch input[type="checkbox"] {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
}

.toggle-track {
  position: relative;
  width: 44px;
  min-width: 44px;
  height: 24px;
  background: #cbd5e1;
  border-radius: 12px;
  transition: background 0.25s ease;
  box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.1);
}

.toggle-track::after {
  content: '';
  position: absolute;
  top: 2px;
  left: 2px;
  width: 20px;
  height: 20px;
  background: #fff;
  border-radius: 50%;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
  transition: transform 0.25s ease;
}

.toggle-switch.active .toggle-track {
  background: #28a745;
}

.toggle-switch.active .toggle-track::after {
  transform: translateX(20px);
}

.toggle-label {
  font-size: 0.925rem;
  font-weight: 500;
  color: var(--gray-700, #495057);
  line-height: 1.4;
}

.toggle-status {
  font-size: 0.8rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 4px;
  margin-left: auto;
  transition: all 0.25s ease;
}

.toggle-status-on {
  color: #28a745;
  background: rgba(40, 167, 69, 0.1);
}

.toggle-status-off {
  color: #6c757d;
  background: rgba(108, 117, 125, 0.1);
}

/* --- Table-inline mini toggle (for boolean columns in data tables) --- */
.table-toggle {
  display: inline-flex;
  align-items: center;
  cursor: pointer;
  user-select: none;
  gap: 0;
}

.table-toggle input[type="checkbox"] {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
}

.table-toggle .toggle-track {
  width: 36px;
  min-width: 36px;
  height: 20px;
  background: #cbd5e1;
  border-radius: 10px;
  transition: background 0.25s ease;
  box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.1);
}

.table-toggle .toggle-track::after {
  width: 16px;
  height: 16px;
  top: 2px;
  left: 2px;
}

.table-toggle.active .toggle-track {
  background: #28a745;
}

.table-toggle.active .toggle-track::after {
  transform: translateX(16px);
}

/* --- Modern custom checkbox (for forms and filters) --- */
.modern-checkbox {
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  user-select: none;
}

.modern-checkbox input[type="checkbox"] {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
}

.modern-checkbox .checkbox-box {
  width: 20px;
  height: 20px;
  min-width: 20px;
  border: 2px solid #cbd5e1;
  border-radius: 5px;
  background: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s ease;
}

.modern-checkbox .checkbox-box svg {
  width: 12px;
  height: 12px;
  stroke: #fff;
  stroke-width: 3;
  fill: none;
  opacity: 0;
  transition: opacity 0.15s ease;
}

.modern-checkbox:hover .checkbox-box {
  border-color: #94a3b8;
}

.modern-checkbox.checked .checkbox-box {
  background: #28a745;
  border-color: #28a745;
}

.modern-checkbox.checked .checkbox-box svg {
  opacity: 1;
}

.modern-checkbox .checkbox-label {
  font-size: 0.925rem;
  color: var(--gray-700, #495057);
  line-height: 1.4;
}

/* ============================================================================
   14. ACCESSIBILITY
   ============================================================================ */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* Focus visible for keyboard navigation */
*:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

/* Screen reader only text */
.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;
}