/* ==================================
   VetCare Online - UI Components
   Reusable components and utilities
================================== */

/* Button Components */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md) var(--spacing-xl);
  border: none;
  border-radius: var(--radius-lg);
  font-family: var(--font-primary);
  font-weight: 600;
  font-size: 0.875rem;
  line-height: 1;
  text-decoration: none;
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
  user-select: none;
  position: relative;
  overflow: hidden;
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

/* Button Sizes */
.btn-sm {
  padding: var(--spacing-sm) var(--spacing-lg);
  font-size: 0.8125rem;
}

.btn-lg {
  padding: var(--spacing-lg) var(--spacing-2xl);
  font-size: 1rem;
}

.btn-xl {
  padding: var(--spacing-xl) var(--spacing-3xl);
  font-size: 1.125rem;
}

/* Button Variants */
.btn-primary {
  background-color: var(--primary-color);
  color: white;
  box-shadow: 0 1px 3px rgba(37, 99, 235, 0.3);
}

.btn-primary:hover {
  background-color: var(--primary-hover);
  color: white;
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.4);
  transform: translateY(-1px);
}

.btn-primary:active {
  transform: translateY(0);
  box-shadow: 0 1px 3px rgba(37, 99, 235, 0.3);
}

.btn-secondary {
  background-color: var(--secondary-color);
  color: white;
  box-shadow: 0 1px 3px rgba(245, 158, 11, 0.3);
}

.btn-secondary:hover {
  background-color: #d97706;
  color: white;
  box-shadow: 0 4px 12px rgba(245, 158, 11, 0.4);
  transform: translateY(-1px);
}

.btn-success {
  background-color: var(--accent-color);
  color: white;
  box-shadow: 0 1px 3px rgba(16, 185, 129, 0.3);
}

.btn-success:hover {
  background-color: #059669;
  color: white;
  box-shadow: 0 4px 12px rgba(16, 185, 129, 0.4);
  transform: translateY(-1px);
}

.btn-danger {
  background-color: var(--danger-color);
  color: white;
  box-shadow: 0 1px 3px rgba(239, 68, 68, 0.3);
}

.btn-danger:hover {
  background-color: #dc2626;
  color: white;
  box-shadow: 0 4px 12px rgba(239, 68, 68, 0.4);
  transform: translateY(-1px);
}

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

.btn-outline:hover {
  background-color: var(--primary-color);
  color: white;
  transform: translateY(-1px);
}

.btn-ghost {
  background-color: transparent;
  color: var(--gray-700);
  border: none;
  box-shadow: none;
}

.btn-ghost:hover {
  background-color: var(--gray-100);
  color: var(--gray-800);
}

.btn-white {
  background-color: white;
  color: var(--gray-700);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--gray-200);
}

.btn-white:hover {
  background-color: var(--gray-50);
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

/* Button with loading state */
.btn-loading {
  color: transparent;
}

.btn-loading::after {
  content: '';
  position: absolute;
  width: 16px;
  height: 16px;
  top: 50%;
  left: 50%;
  margin-left: -8px;
  margin-top: -8px;
  border: 2px solid transparent;
  border-top: 2px solid currentColor;
  border-radius: 50%;
  animation: btn-loading-spinner 1s ease-in-out infinite;
}

@keyframes btn-loading-spinner {
  from {
    transform: rotate(0turn);
  }
  to {
    transform: rotate(1turn);
  }
}

/* Card Components */
.card {
  background-color: white;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-normal);
}

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

.card-header {
  padding-bottom: var(--spacing-lg);
  border-bottom: 1px solid var(--gray-100);
  margin-bottom: var(--spacing-lg);
}

.card-title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--gray-800);
  margin: 0;
}

.card-subtitle {
  font-size: 0.875rem;
  color: var(--gray-600);
  margin: var(--spacing-xs) 0 0 0;
}

.card-body {
  padding: 0;
}

.card-footer {
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--gray-100);
  margin-top: var(--spacing-lg);
}

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

.form-label {
  display: block;
  font-weight: 500;
  color: var(--gray-700);
  margin-bottom: var(--spacing-sm);
  font-size: 0.875rem;
}

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

.form-input,
.form-textarea,
.form-select {
  width: 100%;
  padding: var(--spacing-md);
  border: 1px solid var(--gray-300);
  border-radius: var(--radius-lg);
  font-family: var(--font-primary);
  font-size: 0.875rem;
  background-color: white;
  transition: all var(--transition-fast);
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

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

.form-textarea {
  resize: vertical;
  min-height: 100px;
}

.form-select {
  cursor: pointer;
  background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3e%3cpath stroke='%236b7280' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='m6 8 4 4 4-4'/%3e%3c/svg%3e");
  background-position: right 0.5rem center;
  background-repeat: no-repeat;
  background-size: 1.5em 1.5em;
  padding-right: 2.5rem;
}

/* Form validation states */
.form-input.error,
.form-textarea.error,
.form-select.error {
  border-color: var(--danger-color);
  box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.1);
}

.form-input.success,
.form-textarea.success,
.form-select.success {
  border-color: var(--accent-color);
  box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.1);
}

.form-error {
  color: var(--danger-color);
  font-size: 0.75rem;
  margin-top: var(--spacing-xs);
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.form-success {
  color: var(--accent-color);
  font-size: 0.75rem;
  margin-top: var(--spacing-xs);
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.form-help {
  color: var(--gray-500);
  font-size: 0.75rem;
  margin-top: var(--spacing-xs);
}

/* Checkbox and Radio */
.form-checkbox,
.form-radio {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  cursor: pointer;
  margin-bottom: var(--spacing-md);
}

.form-checkbox input,
.form-radio input {
  width: auto;
  margin: 0;
}

.form-checkbox label,
.form-radio label {
  margin: 0;
  cursor: pointer;
  color: var(--gray-700);
}

/* File Input */
.form-file {
  position: relative;
  display: inline-block;
  cursor: pointer;
}

.form-file input[type="file"] {
  position: absolute;
  opacity: 0;
  width: 100%;
  height: 100%;
  cursor: pointer;
}

.form-file-label {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md) var(--spacing-lg);
  border: 2px dashed var(--gray-300);
  border-radius: var(--radius-lg);
  background-color: var(--gray-50);
  color: var(--gray-600);
  font-weight: 500;
  transition: all var(--transition-fast);
}

.form-file:hover .form-file-label,
.form-file.dragover .form-file-label {
  border-color: var(--primary-color);
  background-color: rgba(37, 99, 235, 0.05);
  color: var(--primary-color);
}

/* Modal Components */
.modal {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10000;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
}

.modal.active {
  opacity: 1;
  visibility: visible;
}

.modal-content {
  background-color: white;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  max-width: 90vw;
  max-height: 90vh;
  overflow: auto;
  transform: scale(0.95);
  transition: transform var(--transition-normal);
}

.modal.active .modal-content {
  transform: scale(1);
}

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

.modal-title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--gray-800);
  margin: 0;
}

.modal-close {
  background: none;
  border: none;
  color: var(--gray-400);
  font-size: 1.5rem;
  cursor: pointer;
  padding: var(--spacing-sm);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.modal-close:hover {
  color: var(--gray-600);
  background-color: var(--gray-100);
}

.modal-body {
  padding: var(--spacing-xl);
}

.modal-footer {
  padding: var(--spacing-xl);
  border-top: 1px solid var(--gray-200);
  display: flex;
  gap: var(--spacing-md);
  justify-content: flex-end;
}

/* Alert Components */
.alert {
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  margin-bottom: var(--spacing-lg);
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-md);
}

.alert-success {
  background-color: #ecfdf5;
  color: #065f46;
  border: 1px solid #a7f3d0;
}

.alert-error {
  background-color: #fef2f2;
  color: #991b1b;
  border: 1px solid #fca5a5;
}

.alert-warning {
  background-color: #fffbeb;
  color: #92400e;
  border: 1px solid #fed7aa;
}

.alert-info {
  background-color: #eff6ff;
  color: #1e40af;
  border: 1px solid #93c5fd;
}

.alert-icon {
  flex-shrink: 0;
  margin-top: 2px;
}

.alert-content {
  flex: 1;
}

.alert-title {
  font-weight: 600;
  margin-bottom: var(--spacing-xs);
}

.alert-message {
  margin: 0;
  line-height: 1.5;
}

.alert-close {
  background: none;
  border: none;
  color: currentColor;
  opacity: 0.7;
  cursor: pointer;
  padding: var(--spacing-xs);
  border-radius: var(--radius-sm);
  transition: opacity var(--transition-fast);
  flex-shrink: 0;
}

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

/* Badge Components */
.badge {
  display: inline-flex;
  align-items: center;
  padding: var(--spacing-xs) var(--spacing-sm);
  font-size: 0.75rem;
  font-weight: 500;
  border-radius: var(--radius-xl);
  text-transform: uppercase;
  letter-spacing: 0.025em;
}

.badge-primary {
  background-color: rgba(37, 99, 235, 0.1);
  color: var(--primary-color);
}

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

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

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

.badge-gray {
  background-color: rgba(107, 114, 128, 0.1);
  color: var(--gray-600);
}

/* Tooltip Components */
.tooltip {
  position: relative;
  cursor: help;
}

.tooltip::before {
  content: attr(data-tooltip);
  position: absolute;
  bottom: 100%;
  left: 50%;
  transform: translateX(-50%);
  background-color: var(--gray-800);
  color: white;
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-md);
  font-size: 0.75rem;
  white-space: nowrap;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-fast);
  z-index: 1000;
  pointer-events: none;
  margin-bottom: var(--spacing-xs);
}

.tooltip::after {
  content: '';
  position: absolute;
  bottom: 100%;
  left: 50%;
  transform: translateX(-50%);
  border: 4px solid transparent;
  border-top-color: var(--gray-800);
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-fast);
}

.tooltip:hover::before,
.tooltip:hover::after {
  opacity: 1;
  visibility: visible;
}

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

.dropdown-content {
  position: absolute;
  top: 100%;
  left: 0;
  background-color: white;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  min-width: 200px;
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: all var(--transition-fast);
}

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

.dropdown-item {
  display: block;
  padding: var(--spacing-md) var(--spacing-lg);
  color: var(--gray-700);
  text-decoration: none;
  transition: background-color var(--transition-fast);
  border-bottom: 1px solid var(--gray-100);
}

.dropdown-item:last-child {
  border-bottom: none;
}

.dropdown-item:hover {
  background-color: var(--gray-50);
  color: var(--gray-800);
}

.dropdown-item.active {
  background-color: var(--primary-color);
  color: white;
}

/* Loading Spinner */
.spinner {
  width: 40px;
  height: 40px;
  border: 4px solid var(--gray-200);
  border-top: 4px solid var(--primary-color);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin: var(--spacing-lg) auto;
}

.spinner-sm {
  width: 20px;
  height: 20px;
  border-width: 2px;
}

.spinner-lg {
  width: 60px;
  height: 60px;
  border-width: 6px;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* Progress Bar */
.progress {
  width: 100%;
  height: 8px;
  background-color: var(--gray-200);
  border-radius: var(--radius-xl);
  overflow: hidden;
}

.progress-bar {
  height: 100%;
  background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
  border-radius: var(--radius-xl);
  transition: width var(--transition-slow);
}

.progress-lg {
  height: 12px;
}

.progress-sm {
  height: 4px;
}

/* Tabs */
.tabs {
  border-bottom: 1px solid var(--gray-200);
}

.tab-list {
  display: flex;
  gap: var(--spacing-lg);
  list-style: none;
  margin: 0;
  padding: 0;
}

.tab-button {
  background: none;
  border: none;
  padding: var(--spacing-lg) 0;
  color: var(--gray-600);
  font-weight: 500;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: all var(--transition-fast);
  position: relative;
}

.tab-button:hover {
  color: var(--gray-800);
}

.tab-button.active {
  color: var(--primary-color);
  border-bottom-color: var(--primary-color);
}

.tab-content {
  padding: var(--spacing-xl) 0;
}

.tab-panel {
  display: none;
}

.tab-panel.active {
  display: block;
}

/* Accordion */
.accordion {
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.accordion-item {
  border-bottom: 1px solid var(--gray-200);
}

.accordion-item:last-child {
  border-bottom: none;
}

.accordion-header {
  width: 100%;
  background: none;
  border: none;
  padding: var(--spacing-lg);
  text-align: left;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: 500;
  color: var(--gray-800);
  transition: background-color var(--transition-fast);
}

.accordion-header:hover {
  background-color: var(--gray-50);
}

.accordion-icon {
  transition: transform var(--transition-fast);
}

.accordion-item.active .accordion-icon {
  transform: rotate(180deg);
}

.accordion-content {
  padding: 0 var(--spacing-lg) var(--spacing-lg);
  display: none;
}

.accordion-item.active .accordion-content {
  display: block;
}

/* Responsive utilities */
@media (max-width: 767px) {
  .btn {
    width: 100%;
    justify-content: center;
  }
  
  .modal-content {
    margin: var(--spacing-lg);
    max-width: calc(100vw - 2rem);
  }
  
  .dropdown-content {
    left: 0;
    right: 0;
    width: auto;
  }
}

/* Focus states for accessibility */
.btn:focus,
.form-input:focus,
.form-textarea:focus,
.form-select:focus,
.tab-button:focus,
.accordion-header:focus {
  outline: 2px solid var(--primary-color);
  outline-offset: 2px;
}

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