/* =============================================================================
   PIMS DESIGN SYSTEM
   =============================================================================
   A unified design system for the Personnel Information Management System
   Built with Tailwind CSS utilities and custom properties
   ============================================================================= */

/* -----------------------------------------------------------------------------
   1. COLOR PALETTE
   ----------------------------------------------------------------------------- */

:root {
  /* Primary - Nigeria Green */
  --color-primary-50:  #f0fdf4;
  --color-primary-100: #dcfce7;
  --color-primary-200: #bbf7d0;
  --color-primary-300: #86efac;
  --color-primary-400: #4ade80;
  --color-primary-500: #008751;  /* Main brand green */
  --color-primary-600: #006B40;  /* Darker brand green */
  --color-primary-700: #005533;
  --color-primary-800: #003d26;
  --color-primary-900: #002619;

  /* Secondary - Neutral Slate */
  --color-neutral-50:  #f8fafc;
  --color-neutral-100: #f1f5f9;
  --color-neutral-200: #e2e8f0;
  --color-neutral-300: #cbd5e1;
  --color-neutral-400: #94a3b8;
  --color-neutral-500: #64748b;
  --color-neutral-600: #475569;
  --color-neutral-700: #334155;
  --color-neutral-800: #1e293b;
  --color-neutral-900: #0f172a;
  --color-neutral-950: #020617;

  /* Semantic Colors */
  --color-success-50:  #f0fdf4;
  --color-success-100: #dcfce7;
  --color-success-500: #22c55e;
  --color-success-600: #16a34a;
  --color-success-700: #15803d;

  --color-warning-50:  #fffbeb;
  --color-warning-100: #fef3c7;
  --color-warning-500: #f59e0b;
  --color-warning-600: #d97706;
  --color-warning-700: #b45309;

  --color-error-50:  #fef2f2;
  --color-error-100: #fee2e2;
  --color-error-500: #ef4444;
  --color-error-600: #dc2626;
  --color-error-700: #b91c1c;

  --color-info-50:  #eff6ff;
  --color-info-100: #dbeafe;
  --color-info-500: #3b82f6;
  --color-info-600: #2563eb;
  --color-info-700: #1d4ed8;

  /* Priority Colors */
  --color-urgent-50:  #fef2f2;
  --color-urgent-100: #fee2e2;
  --color-urgent-500: #ef4444;
  --color-urgent-600: #dc2626;

  --color-high-50:  #fffbeb;
  --color-high-100: #fef3c7;
  --color-high-500: #f59e0b;
  --color-high-600: #d97706;

  --color-normal-50:  #f8fafc;
  --color-normal-100: #f1f5f9;
  --color-normal-500: #64748b;
  --color-normal-600: #475569;

  /* Status Colors */
  --color-status-active:      var(--color-success-600);
  --color-status-pending:     var(--color-warning-600);
  --color-status-in_transit:  var(--color-info-600);
  --color-status-approved:    var(--color-success-600);
  --color-status-rejected:    var(--color-error-600;
  --color-status-closed:      var(--color-neutral-500);
  --color-status-archived:    var(--color-neutral-400);
}

/* -----------------------------------------------------------------------------
   2. TYPOGRAPHY
   ----------------------------------------------------------------------------- */

:root {
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-display: 'Outfit', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  
  --text-xs:    0.75rem;   /* 12px */
  --text-sm:    0.875rem;  /* 14px */
  --text-base:  1rem;      /* 16px */
  --text-lg:    1.125rem;  /* 18px */
  --text-xl:    1.25rem;   /* 20px */
  --text-2xl:   1.5rem;    /* 24px */
  --text-3xl:   1.875rem;  /* 30px */
  --text-4xl:   2.25rem;   /* 36px */

  --leading-tight:   1.25;
  --leading-normal:  1.5;
  --leading-relaxed: 1.625;

  --font-normal:  400;
  --font-medium:  500;
  --font-semibold: 600;
  --font-bold:    700;
  --font-extrabold: 800;
}

/* Font family utilities */
.font-sans { font-family: var(--font-sans); }
.font-display { font-family: var(--font-display); }
.font-mono { font-family: var(--font-mono); }

/* Text size utilities */
.text-xs { font-size: var(--text-xs); }
.text-sm { font-size: var(--text-sm); }
.text-base { font-size: var(--text-base); }
.text-lg { font-size: var(--text-lg); }
.text-xl { font-size: var(--text-xl); }
.text-2xl { font-size: var(--text-2xl); }
.text-3xl { font-size: var(--text-3xl); }
.text-4xl { font-size: var(--text-4xl); }

/* Font weight utilities */
.font-normal { font-weight: var(--font-normal); }
.font-medium { font-weight: var(--font-medium); }
.font-semibold { font-weight: var(--font-semibold); }
.font-bold { font-weight: var(--font-bold); }
.font-extrabold { font-weight: var(--font-extrabold); }

/* Line height utilities */
.leading-tight { line-height: var(--leading-tight); }
.leading-normal { line-height: var(--leading-normal); }
.leading-relaxed { line-height: var(--leading-relaxed); }

/* -----------------------------------------------------------------------------
   3. SPACING SCALE
   ----------------------------------------------------------------------------- */

:root {
  --space-0: 0;
  --space-1: 0.25rem;  /* 4px */
  --space-2: 0.5rem;   /* 8px */
  --space-3: 0.75rem;  /* 12px */
  --space-4: 1rem;     /* 16px */
  --space-5: 1.25rem;  /* 20px */
  --space-6: 1.5rem;   /* 24px */
  --space-8: 2rem;     /* 32px */
  --space-10: 2.5rem;  /* 40px */
  --space-12: 3rem;    /* 48px */
  --space-16: 4rem;    /* 64px */
  --space-20: 5rem;    /* 80px */
  --space-24: 6rem;    /* 96px */
}

/* -----------------------------------------------------------------------------
   4. BORDER RADIUS
   ----------------------------------------------------------------------------- */

:root {
  --radius-none: 0;
  --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;
}

/* -----------------------------------------------------------------------------
   5. SHADOWS
   ----------------------------------------------------------------------------- */

:root {
  --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 -2px rgba(0, 0, 0, 0.1);
  --shadow-lg:  0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
  --shadow-xl:  0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
  --shadow-inner: inset 0 2px 4px 0 rgba(0, 0, 0, 0.05);
}

/* -----------------------------------------------------------------------------
   6. TRANSITIONS
   ----------------------------------------------------------------------------- */

:root {
  --transition-fast: 150ms ease;
  --transition-normal: 200ms ease;
  --transition-slow: 300ms ease;
}

/* -----------------------------------------------------------------------------
   7. Z-INDEX SCALE
   ----------------------------------------------------------------------------- */

:root {
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-fixed: 300;
  --z-modal-backdrop: 400;
  --z-modal: 500;
  --z-popover: 600;
  --z-tooltip: 700;
  --z-toast: 800;
}

/* -----------------------------------------------------------------------------
   8. COMPONENT BASE STYLES
   ----------------------------------------------------------------------------- */

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  line-height: 1.5;
  padding: 0.625rem 1.25rem;
  border-radius: var(--radius-lg);
  border: none;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
  white-space: nowrap;
}

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

.btn:focus-visible {
  outline: none;
  box-shadow: 0 0 0 3px var(--color-primary-100);
}

/* Primary button */
.btn-primary {
  background-color: var(--color-primary-500);
  color: white;
}

.btn-primary:hover:not(:disabled) {
  background-color: var(--color-primary-600);
}

.btn-primary:active:not(:disabled) {
  background-color: var(--color-primary-700);
}

/* Secondary button */
.btn-secondary {
  background-color: white;
  color: var(--color-primary-500);
  border: 2px solid var(--color-primary-500);
}

.btn-secondary:hover:not(:disabled) {
  background-color: var(--color-primary-50);
}

/* Outline button */
.btn-outline {
  background-color: transparent;
  color: var(--color-neutral-700);
  border: 1px solid var(--color-neutral-300);
}

.btn-outline:hover:not(:disabled) {
  background-color: var(--color-neutral-50);
  border-color: var(--color-neutral-400);
}

/* Danger button */
.btn-danger {
  background-color: var(--color-error-500);
  color: white;
}

.btn-danger:hover:not(:disabled) {
  background-color: var(--color-error-600);
}

/* Ghost button */
.btn-ghost {
  background-color: transparent;
  color: var(--color-neutral-600);
}

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

/* Button sizes */
.btn-sm {
  font-size: var(--text-xs);
  padding: 0.375rem 0.75rem;
  gap: 0.375rem;
}

.btn-lg {
  font-size: var(--text-base);
  padding: 0.875rem 1.75rem;
  gap: 0.625rem;
}

/* Form Inputs */
.form-input,
.form-select,
.form-textarea {
  display: block;
  width: 100%;
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  line-height: 1.5;
  color: var(--color-neutral-900);
  background-color: white;
  border: 1px solid var(--color-neutral-300);
  border-radius: var(--radius-lg);
  padding: 0.625rem 0.875rem;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--color-primary-500);
  box-shadow: 0 0 0 3px var(--color-primary-100);
}

.form-input::placeholder,
.form-textarea::placeholder {
  color: var(--color-neutral-400);
}

.form-input:disabled,
.form-select:disabled,
.form-textarea:disabled {
  background-color: var(--color-neutral-100);
  color: var(--color-neutral-500);
  cursor: not-allowed;
}

.form-input-error {
  border-color: var(--color-error-500);
}

.form-input-error:focus {
  box-shadow: 0 0 0 3px var(--color-error-100);
}

.form-label {
  display: block;
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--color-neutral-700);
  margin-bottom: 0.375rem;
}

.form-hint {
  font-size: var(--text-xs);
  color: var(--color-neutral-500);
  margin-top: 0.375rem;
}

.form-error {
  font-size: var(--text-xs);
  color: var(--color-error-600);
  margin-top: 0.375rem;
}

/* Cards */
.card {
  background: white;
  border: 1px solid var(--color-neutral-200);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

.card-header {
  padding: var(--space-5) var(--space-6);
  border-bottom: 1px solid var(--color-neutral-200);
  background: var(--color-neutral-50);
}

.card-body {
  padding: var(--space-6);
}

.card-footer {
  padding: var(--space-4) var(--space-6);
  border-top: 1px solid var(--color-neutral-200);
  background: var(--color-neutral-50);
}

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 0.25rem 0.625rem;
  font-size: var(--text-xs);
  font-weight: var(--font-semibold);
  border-radius: var(--radius-full);
  line-height: 1.4;
}

.badge-sm {
  padding: 0.125rem 0.5rem;
  font-size: 0.6875rem;
}

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

/* Badge variants */
.badge-primary {
  background: var(--color-primary-100);
  color: var(--color-primary-700);
}

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

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

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

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

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

.badge-urgent {
  background: var(--color-urgent-100);
  color: var(--color-urgent-600);
}

.badge-high {
  background: var(--color-high-100);
  color: var(--color-high-600);
}

.badge-normal {
  background: var(--color-normal-100);
  color: var(--color-normal-600);
}

/* Priority-specific badges */
.badge-priority-urgent { @extend .badge-urgent; }
.badge-priority-high { @extend .badge-high; }
.badge-priority-normal { @extend .badge-normal; }

/* Status badges */
.badge-status-active {
  background: var(--color-success-100);
  color: var(--color-success-700);
}

.badge-status-pending {
  background: var(--color-warning-100);
  color: var(--color-warning-700);
}

.badge-status-in_transit {
  background: var(--color-info-100);
  color: var(--color-info-700);
}

.badge-status-approved {
  background: var(--color-success-100);
  color: var(--color-success-700);
}

.badge-status-rejected {
  background: var(--color-error-100);
  color: var(--color-error-700);
}

.badge-status-closed {
  background: var(--color-neutral-100);
  color: var(--color-neutral-700);
}

.badge-status-archived {
  background: var(--color-neutral-100);
  color: var(--color-neutral-600);
}

/* Alerts */
.alert {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  padding: 1rem;
  border-radius: var(--radius-lg);
  border: 1px solid;
}

.alert-icon {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  margin-top: 0.125rem;
}

.alert-content {
  flex: 1;
}

.alert-title {
  font-weight: var(--font-semibold);
  margin-bottom: 0.25rem;
}

.alert-message {
  font-size: var(--text-sm);
  line-height: 1.5;
}

.alert-dismiss {
  flex-shrink: 0;
  padding: 0.25rem;
  color: inherit;
  opacity: 0.6;
  background: none;
  border: none;
  cursor: pointer;
  border-radius: var(--radius-sm);
}

.alert-dismiss:hover {
  opacity: 1;
  background: rgba(0, 0, 0, 0.05);
}

.alert-primary {
  background: var(--color-primary-50);
  border-color: var(--color-primary-200);
  color: var(--color-primary-800);
}

.alert-success {
  background: var(--color-success-50);
  border-color: var(--color-success-200);
  color: var(--color-success-800);
}

.alert-warning {
  background: var(--color-warning-50);
  border-color: var(--color-warning-200);
  color: var(--color-warning-800);
}

.alert-error {
  background: var(--color-error-50);
  border-color: var(--color-error-200);
  color: var(--color-error-800);
}

.alert-info {
  background: var(--color-info-50);
  border-color: var(--color-info-200);
  color: var(--color-info-800);
}

/* Tables */
.table-container {
  overflow-x: auto;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-neutral-200);
}

.table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--text-sm);
}

.table th,
.table td {
  padding: 0.75rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--color-neutral-200);
}

.table th {
  background: var(--color-neutral-50);
  font-weight: var(--font-semibold);
  color: var(--color-neutral-700);
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

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

.table tbody tr:hover {
  background: var(--color-neutral-50);
}

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

.table-striped tbody tr:nth-child(even) {
  background: var(--color-neutral-50);
}

/* Dropdown */
.dropdown {
  position: relative;
  display: inline-block;
}

.dropdown-menu {
  position: absolute;
  top: 100%;
  right: 0;
  z-index: var(--z-dropdown);
  min-width: 12rem;
  margin-top: 0.5rem;
  background: white;
  border: 1px solid var(--color-neutral-200);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: 0.5rem 0;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: all var(--transition-fast);
}

.dropdown.open .dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.dropdown-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  width: 100%;
  padding: 0.5rem 1rem;
  font-size: var(--text-sm);
  color: var(--color-neutral-700);
  background: none;
  border: none;
  text-align: left;
  cursor: pointer;
  transition: background var(--transition-fast);
}

.dropdown-item:hover {
  background: var(--color-neutral-50);
  color: var(--color-neutral-900);
}

.dropdown-divider {
  height: 1px;
  background: var(--color-neutral-200);
  margin: 0.5rem 0;
}

/* Avatar */
.avatar {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  background: var(--color-primary-100);
  color: var(--color-primary-700);
  font-weight: var(--font-semibold);
  font-size: var(--text-sm);
  overflow: hidden;
}

.avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.avatar-sm { width: 28px; height: 28px; font-size: var(--text-xs); }
.avatar-lg { width: 56px; height: 56px; font-size: var(--text-lg); }
.avatar-xl { width: 80px; height: 80px; font-size: var(--text-2xl); }

/* Icon sizes */
.icon-xs { width: 12px; height: 12px; }
.icon-sm { width: 16px; height: 16px; }
.icon-md { width: 20px; height: 20px; }
.icon-lg { width: 24px; height: 24px; }
.icon-xl { width: 32px; height: 32px; }

/* Page header */
.page-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1.5rem;
  flex-wrap: wrap;
  margin-bottom: 1.5rem;
}

.page-header-title {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.page-header h1 {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: var(--font-bold);
  color: var(--color-neutral-900);
}

.page-header-subtitle {
  font-size: var(--text-sm);
  color: var(--color-neutral-500);
}

/* Breadcrumbs */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: var(--text-sm);
  color: var(--color-neutral-500);
}

.breadcrumb a {
  color: var(--color-neutral-500);
  transition: color var(--transition-fast);
}

.breadcrumb a:hover {
  color: var(--color-primary-600);
}

.breadcrumb-separator {
  color: var(--color-neutral-400);
}

.breadcrumb-current {
  color: var(--color-neutral-900);
  font-weight: var(--font-medium);
}

/* Empty state */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 3rem 1.5rem;
  text-align: center;
}

.empty-state-icon {
  width: 64px;
  height: 64px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1rem;
  background: var(--color-neutral-100);
  color: var(--color-neutral-500);
}

.empty-state-title {
  font-size: var(--text-lg);
  font-weight: var(--font-semibold);
  color: var(--color-neutral-900);
  margin-bottom: 0.5rem;
}

.empty-state-message {
  font-size: var(--text-sm);
  color: var(--color-neutral-500);
  max-width: 280px;
  margin-bottom: 1.5rem;
}

/* -----------------------------------------------------------------------------
   9. UTILITY CLASSES
   ----------------------------------------------------------------------------- */

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

.truncate {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.line-clamp-2 {
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.line-clamp-3 {
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* Scrollbar styling */
.scrollbar-thin::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

.scrollbar-thin::-webkit-scrollbar-track {
  background: transparent;
}

.scrollbar-thin::-webkit-scrollbar-thumb {
  background: var(--color-neutral-300);
  border-radius: 3px;
}

.scrollbar-thin::-webkit-scrollbar-thumb:hover {
  background: var(--color-neutral-400);
}

/* Focus ring */
.focus-ring:focus-visible {
  outline: none;
  ring: 2px;
  ring-offset: 2px;
  ring-color: var(--color-primary-500);
}

/* Print styles */
@media print {
  .no-print { display: none !important; }
  .card { box-shadow: none; border: 1px solid var(--color-neutral-300); }
  .btn { display: none !important; }
}