/**
 * Component Library - Workplace Management App
 * Modern, reusable UI components
 *
 * Requires: design-tokens.css
 */

/* ============================================
   BUTTONS - Modern Button System
   ============================================ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--btn-padding-y) var(--btn-padding-x);
  font-size: var(--text-base);
  font-weight: var(--btn-font-weight);
  line-height: var(--leading-tight);
  border-radius: var(--btn-border-radius);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--transition-base) var(--ease-in-out);
  text-decoration: none;
  white-space: nowrap;
  user-select: none;
}

.btn:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}

.btn:active {
  transform: translateY(0);
}

.btn:disabled,
.btn.disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

/* Button Sizes */
.btn-sm {
  padding: var(--btn-padding-y-sm) var(--btn-padding-x-sm);
  font-size: var(--text-sm);
}

.btn-lg {
  padding: var(--btn-padding-y-lg) var(--btn-padding-x-lg);
  font-size: var(--text-lg);
}

/* Primary Button */
.btn-primary {
  background: linear-gradient(135deg, var(--color-primary-600) 0%, var(--color-primary-700) 100%);
  color: var(--text-inverse);
  border-color: var(--color-primary-600);
}

.btn-primary:hover:not(:disabled) {
  background: linear-gradient(135deg, var(--color-primary-700) 0%, var(--color-primary-800) 100%);
  border-color: var(--color-primary-700);
  box-shadow: var(--shadow-md);
}

.btn-primary:active:not(:disabled) {
  background: var(--color-primary-800);
}

/* Secondary Button */
.btn-secondary {
  background: var(--bg-primary);
  color: var(--text-primary);
  border-color: var(--border-medium);
}

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

/* Success Button */
.btn-success {
  background: linear-gradient(135deg, var(--color-success-600) 0%, var(--color-success-700) 100%);
  color: var(--text-inverse);
  border-color: var(--color-success-600);
}

.btn-success:hover:not(:disabled) {
  background: linear-gradient(135deg, var(--color-success-700) 0%, var(--color-success-800) 100%);
  box-shadow: var(--shadow-md);
}

/* Danger Button */
.btn-danger {
  background: linear-gradient(135deg, var(--color-danger-600) 0%, var(--color-danger-700) 100%);
  color: var(--text-inverse);
  border-color: var(--color-danger-600);
}

.btn-danger:hover:not(:disabled) {
  background: linear-gradient(135deg, var(--color-danger-700) 0%, var(--color-danger-800) 100%);
  box-shadow: var(--shadow-md);
}

/* Warning Button */
.btn-warning {
  background: linear-gradient(135deg, var(--color-warning-500) 0%, var(--color-warning-600) 100%);
  color: var(--color-neutral-900);
  border-color: var(--color-warning-500);
}

.btn-warning:hover:not(:disabled) {
  background: linear-gradient(135deg, var(--color-warning-600) 0%, var(--color-warning-700) 100%);
  box-shadow: var(--shadow-md);
}

/* Info Button */
.btn-info {
  background: linear-gradient(135deg, var(--color-info-600) 0%, var(--color-info-700) 100%);
  color: var(--text-inverse);
  border-color: var(--color-info-600);
}

.btn-info:hover:not(:disabled) {
  background: linear-gradient(135deg, var(--color-info-700) 0%, var(--color-info-800) 100%);
  box-shadow: var(--shadow-md);
}

/* Ghost Button */
.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  border-color: transparent;
}

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

/* Outline Buttons */
.btn-outline-primary {
  background: transparent;
  color: var(--color-primary-600);
  border-color: var(--color-primary-600);
}

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

/* Loading State */
.btn.btn-loading {
  position: relative;
  color: transparent;
  pointer-events: none;
}

.btn.btn-loading::after {
  content: '';
  position: absolute;
  width: 1rem;
  height: 1rem;
  top: 50%;
  left: 50%;
  margin-left: -0.5rem;
  margin-top: -0.5rem;
  border: 2px solid currentColor;
  border-right-color: transparent;
  border-radius: 50%;
  animation: spinner-border 0.75s linear infinite;
}

@keyframes spinner-border {
  to { transform: rotate(360deg); }
}

/* Button with icon */
.btn i {
  font-size: 1.1em;
}

/* ============================================
   CARDS - Modern Card Components
   ============================================ */

.card {
  background: var(--bg-primary);
  border: var(--card-border);
  border-radius: var(--card-border-radius);
  box-shadow: var(--card-shadow);
  transition: all var(--transition-base) var(--ease-in-out);
}

.card-hover:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.card-header {
  padding: var(--space-5);
  border-bottom: 1px solid var(--border-light);
  background: var(--bg-secondary);
  border-radius: var(--card-border-radius) var(--card-border-radius) 0 0;
}

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

.card-footer {
  padding: var(--space-5);
  border-top: 1px solid var(--border-light);
  background: var(--bg-secondary);
  border-radius: 0 0 var(--card-border-radius) var(--card-border-radius);
}

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

.card-subtitle {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  margin-top: var(--space-1);
}

/* ============================================
   BADGES - Status & Label Indicators
   ============================================ */

.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-2-5);
  font-size: var(--text-xs);
  font-weight: var(--font-medium);
  line-height: var(--leading-tight);
  border-radius: var(--radius-full);
  white-space: nowrap;
}

.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-danger {
  background: var(--color-danger-100);
  color: var(--color-danger-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 with dot indicator */
.badge-dot::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
}

/* ============================================
   FORMS - Modern Form Components
   ============================================ */

.form-label {
  display: block;
  margin-bottom: var(--space-2);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--text-primary);
}

.form-label-required::after {
  content: '*';
  color: var(--color-danger-600);
  margin-left: var(--space-1);
}

.form-control {
  display: block;
  width: 100%;
  padding: var(--input-padding-y) var(--input-padding-x);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  color: var(--text-primary);
  background: var(--bg-primary);
  border: var(--input-border);
  border-radius: var(--input-border-radius);
  transition: all var(--transition-base) var(--ease-in-out);
}

.form-control:focus {
  outline: none;
  border-color: var(--input-focus-border);
  box-shadow: var(--input-focus-shadow);
}

.form-control:disabled {
  background: var(--bg-secondary);
  color: var(--text-disabled);
  cursor: not-allowed;
}

.form-control::placeholder {
  color: var(--text-tertiary);
}

/* Form validation states */
.form-control.is-valid {
  border-color: var(--color-success-500);
}

.form-control.is-valid:focus {
  border-color: var(--color-success-500);
  box-shadow: 0 0 0 3px var(--color-success-100);
}

.form-control.is-invalid {
  border-color: var(--color-danger-500);
}

.form-control.is-invalid:focus {
  border-color: var(--color-danger-500);
  box-shadow: 0 0 0 3px var(--color-danger-100);
}

.form-error {
  display: block;
  margin-top: var(--space-1);
  font-size: var(--text-sm);
  color: var(--color-danger-600);
}

.form-help {
  display: block;
  margin-top: var(--space-1);
  font-size: var(--text-sm);
  color: var(--text-secondary);
}

/* ============================================
   TABLES - Enhanced Table Styling
   ============================================ */

.table {
  width: 100%;
  margin-bottom: var(--space-4);
  border-collapse: separate;
  border-spacing: 0;
}

.table thead th {
  background: var(--table-header-bg);
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wide);
  padding: var(--space-3) var(--space-4);
  border-bottom: 2px solid var(--border-medium);
  text-align: left;
}

.table tbody td {
  padding: var(--space-4);
  border-bottom: 1px solid var(--table-border);
  vertical-align: middle;
  height: var(--table-row-height);
}

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

.table tbody tr:hover {
  background: var(--table-hover-bg);
}

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

/* ============================================
   ALERTS - Toast & Alert Notifications
   ============================================ */

.alert {
  padding: var(--space-4);
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  margin-bottom: var(--space-4);
}

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

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

/* ============================================
   LOADING STATES - Skeletons & Spinners
   ============================================ */

.skeleton {
  background: linear-gradient(
    90deg,
    var(--color-neutral-200) 0%,
    var(--color-neutral-100) 50%,
    var(--color-neutral-200) 100%
  );
  background-size: 200% 100%;
  animation: skeleton-loading 1.5s ease-in-out infinite;
  border-radius: var(--radius-base);
}

@keyframes skeleton-loading {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

.skeleton-text {
  height: 1em;
  margin-bottom: var(--space-2);
}

.skeleton-title {
  height: 1.5em;
  width: 60%;
  margin-bottom: var(--space-3);
}

.skeleton-avatar {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
}

/* Spinner */
.spinner {
  width: 1.5rem;
  height: 1.5rem;
  border: 3px solid var(--color-neutral-200);
  border-top-color: var(--color-primary-600);
  border-radius: 50%;
  animation: spinner-border 0.75s linear infinite;
}

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

.spinner-lg {
  width: 3rem;
  height: 3rem;
  border-width: 4px;
}

/* ============================================
   EMPTY STATES
   ============================================ */

.empty-state {
  text-align: center;
  padding: var(--space-16) var(--space-8);
}

.empty-state-icon {
  width: 80px;
  height: 80px;
  margin: 0 auto var(--space-6);
  opacity: 0.5;
}

.empty-state-title {
  font-size: var(--text-2xl);
  font-weight: var(--font-semibold);
  color: var(--text-primary);
  margin-bottom: var(--space-3);
}

.empty-state-description {
  font-size: var(--text-base);
  color: var(--text-secondary);
  margin-bottom: var(--space-6);
  max-width: 400px;
  margin-left: auto;
  margin-right: auto;
}

/* ============================================
   BREADCRUMBS - Improved Navigation
   ============================================ */

.breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) 0;
  margin-bottom: var(--space-6);
  background: transparent;
  font-size: var(--text-sm);
}

.breadcrumb-item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--text-secondary);
}

.breadcrumb-item a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color var(--transition-fast) var(--ease-in-out);
}

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

.breadcrumb-item.active {
  color: var(--text-primary);
  font-weight: var(--font-medium);
}

.breadcrumb-item + .breadcrumb-item::before {
  content: '/';
  color: var(--text-tertiary);
  margin-right: var(--space-2);
}

/* ============================================
   UTILITIES - Helper Classes
   ============================================ */

/* Visibility */
.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;
}

/* Skip link for accessibility */
.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--color-primary-600);
  color: white;
  padding: var(--space-2) var(--space-4);
  text-decoration: none;
  z-index: var(--z-tooltip);
}

.skip-link:focus {
  top: 0;
}

/* Text truncation */
.truncate {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* Transitions */
.transition-all {
  transition: all var(--transition-base) var(--ease-in-out);
}

.transition-fast {
  transition: all var(--transition-fast) var(--ease-in-out);
}