/**
 * UI Компоненты
 * Кнопки, формы, карточки, модалки и т.д.
 */

/* === Кнопки === */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-2);
  padding: var(--spacing-2) var(--spacing-4);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  line-height: 1.5;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
  white-space: nowrap;
}

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

.btn-sm {
  padding: var(--spacing-1) var(--spacing-3);
  font-size: var(--text-xs);
}

.btn-lg {
  padding: var(--spacing-3) var(--spacing-6);
  font-size: var(--text-base);
}

.btn-primary {
  background: var(--color-primary-600);
  color: white;
  border-color: var(--color-primary-600);
}

.btn-primary:hover:not(:disabled) {
  background: var(--color-primary-500);
  border-color: var(--color-primary-500);
}

.btn-secondary {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border-color: var(--border-color);
}

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

.btn-success {
  background: var(--color-success-600);
  color: white;
  border-color: var(--color-success-600);
}

.btn-success:hover:not(:disabled) {
  background: var(--color-success-500);
}

.btn-danger {
  background: var(--color-danger-600);
  color: white;
  border-color: var(--color-danger-600);
}

.btn-danger:hover:not(:disabled) {
  background: var(--color-danger-500);
}

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

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

.btn-icon {
  padding: var(--spacing-2);
  border-radius: var(--radius-md);
}

/* === Формы === */
.form-group {
  margin-bottom: var(--spacing-4);
}

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

.form-label.required::after {
  content: " *";
  color: var(--color-danger-500);
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: var(--spacing-2) var(--spacing-3);
  font-size: var(--text-sm);
  color: var(--text-primary);
  background: var(--input-bg);
  border: 1px solid var(--input-border);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--border-focus);
  background: var(--input-focus-bg);
  box-shadow: 0 0 0 3px rgba(61, 161, 223, 0.15);
}

.form-input::placeholder,
.form-textarea::placeholder {
  color: var(--text-muted);
}

.form-input:disabled,
.form-select:disabled,
.form-textarea:disabled {
  background: var(--bg-tertiary);
  color: var(--text-muted);
  cursor: not-allowed;
}

.form-input.error,
.form-select.error,
.form-textarea.error {
  border-color: var(--color-danger-500);
}

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

.form-select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%238899a6' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.75rem center;
  padding-right: 2.5rem;
}

.form-hint {
  margin-top: var(--spacing-1);
  font-size: var(--text-xs);
  color: var(--text-muted);
}

.form-error {
  margin-top: var(--spacing-1);
  font-size: var(--text-xs);
  color: var(--color-danger-500);
}

/* Checkbox & Radio */
.form-check {
  display: flex;
  align-items: center;
  gap: var(--spacing-2);
  cursor: pointer;
}

.form-check-input {
  width: 18px;
  height: 18px;
  accent-color: var(--color-primary-500);
  cursor: pointer;
}

.form-check-label {
  font-size: var(--text-sm);
  color: var(--text-primary);
}

/* Toggle Switch */
.toggle {
  position: relative;
  display: inline-block;
  width: 44px;
  height: 24px;
}

.toggle input {
  opacity: 0;
  width: 0;
  height: 0;
}

.toggle-slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--bg-tertiary);
  border-radius: var(--radius-full);
  transition: var(--transition-fast);
}

.toggle-slider::before {
  position: absolute;
  content: "";
  height: 18px;
  width: 18px;
  left: 3px;
  bottom: 3px;
  background: white;
  border-radius: var(--radius-full);
  transition: var(--transition-fast);
}

.toggle input:checked + .toggle-slider {
  background: var(--color-primary-500);
}

.toggle input:checked + .toggle-slider::before {
  transform: translateX(20px);
}

/* === Карточки === */
.card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.card-header {
  padding: var(--spacing-4) var(--spacing-6);
  border-bottom: 1px solid var(--card-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-4);
}

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

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

.card-footer {
  padding: var(--spacing-4) var(--spacing-6);
  border-top: 1px solid var(--card-border);
  background: var(--bg-secondary);
}

/* === Бейджи === */
.badge {
  display: inline-flex;
  align-items: center;
  padding: var(--spacing-1) var(--spacing-2);
  font-size: var(--text-xs);
  font-weight: var(--font-medium);
  border-radius: var(--radius-full);
  white-space: nowrap;
}

.badge-primary {
  background: var(--color-primary-900);
  color: var(--color-primary-300);
}

.badge-success {
  background: var(--color-success-900);
  color: var(--color-success-300);
}

.badge-warning {
  background: var(--color-warning-900);
  color: var(--color-warning-300);
}

.badge-danger {
  background: var(--color-danger-900);
  color: var(--color-danger-300);
}

.badge-neutral {
  background: var(--bg-tertiary);
  color: var(--text-secondary);
}

.badge-info {
  background: rgba(59, 130, 246, 0.15);
  color: rgb(96, 165, 250);
}

.badge-info-light {
  background: rgba(147, 197, 253, 0.15);
  color: rgb(147, 197, 253);
  border: 1px solid rgba(147, 197, 253, 0.3);
}

/* === Алерты === */
.alert {
  padding: var(--spacing-4);
  border-radius: var(--radius-md);
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-3);
  margin-bottom: var(--spacing-4);
}

.alert-icon {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
}

.alert-content {
  flex: 1;
}

.alert-title {
  font-weight: var(--font-semibold);
  margin-bottom: var(--spacing-1);
}

.alert-info {
  background: var(--color-primary-900);
  border: 1px solid var(--color-primary-700);
  color: var(--color-primary-200);
}

.alert-success {
  background: var(--color-success-900);
  border: 1px solid var(--color-success-700);
  color: var(--color-success-200);
}

.alert-warning {
  background: var(--color-warning-900);
  border: 1px solid var(--color-warning-700);
  color: var(--color-warning-200);
}

.alert-danger {
  background: var(--color-danger-900);
  border: 1px solid var(--color-danger-700);
  color: var(--color-danger-200);
}

/* === Модальные окна === */
.modal-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.7);
  z-index: var(--z-modal-backdrop);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-4);
  animation: fadeIn 0.2s ease-out;
}

.modal {
  background: var(--bg-secondary);
  border-radius: var(--radius-xl);
  max-width: 500px;
  width: 100%;
  max-height: 90vh;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  animation: slideInUp 0.3s ease-out;
}

.modal-lg { max-width: 800px; }
.modal-sm { max-width: 400px; }

.modal-header {
  padding: var(--spacing-4) var(--spacing-6);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-title {
  font-size: var(--text-lg);
  font-weight: var(--font-semibold);
  margin: 0;
}

.modal-close {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: var(--spacing-2);
  border-radius: var(--radius-md);
  transition: var(--transition-fast);
}

.modal-close:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.modal-body {
  padding: var(--spacing-6);
  overflow-y: auto;
  flex: 1;
}

.modal-footer {
  padding: var(--spacing-4) var(--spacing-6);
  border-top: 1px solid var(--border-color);
  display: flex;
  justify-content: flex-end;
  gap: var(--spacing-3);
}

/* === Toast Notifications === */
.toast-container {
  position: fixed;
  top: var(--spacing-4);
  right: var(--spacing-4);
  z-index: var(--z-toast);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-2);
}

.toast {
  background: var(--bg-elevated);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--spacing-4);
  min-width: 300px;
  max-width: 400px;
  box-shadow: var(--shadow-lg);
  animation: slideInRight 0.3s ease-out;
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-3);
}

.toast-success { border-left: 4px solid var(--color-success-500); }
.toast-error { border-left: 4px solid var(--color-danger-500); }
.toast-warning { border-left: 4px solid var(--color-warning-500); }
.toast-info { border-left: 4px solid var(--color-primary-500); }

.toast-icon {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
}

.toast-content { flex: 1; }

.toast-title {
  font-weight: var(--font-semibold);
  margin-bottom: var(--spacing-1);
}

.toast-message {
  font-size: var(--text-sm);
  color: var(--text-secondary);
}

.toast-close {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: var(--spacing-1);
}

/* === Tabs === */
.tabs {
  display: flex;
  border-bottom: 1px solid var(--border-color);
  gap: var(--spacing-1);
}

.tab {
  padding: var(--spacing-3) var(--spacing-4);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--text-secondary);
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  cursor: pointer;
  transition: var(--transition-fast);
  margin-bottom: -1px;
}

.tab:hover {
  color: var(--text-primary);
}

.tab.active {
  color: var(--color-primary-400);
  border-bottom-color: var(--color-primary-400);
}

.tab-content {
  padding: var(--spacing-4) 0;
}

.tab-panel {
  display: none;
}

.tab-panel.active {
  display: block;
  animation: fadeIn 0.2s ease-out;
}

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

.dropdown-menu {
  position: absolute;
  top: 100%;
  right: 0;
  margin-top: var(--spacing-2);
  min-width: 180px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  z-index: var(--z-dropdown);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: all var(--transition-fast);
}

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

.dropdown-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-2);
  padding: var(--spacing-2) var(--spacing-4);
  font-size: var(--text-sm);
  color: var(--text-primary);
  cursor: pointer;
  transition: var(--transition-fast);
}

.dropdown-item:hover {
  background: var(--bg-hover);
}

.dropdown-item:first-child {
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

.dropdown-item:last-child {
  border-radius: 0 0 var(--radius-lg) var(--radius-lg);
}

.dropdown-divider {
  height: 1px;
  background: var(--border-color);
  margin: var(--spacing-2) 0;
}

/* === Loading Spinner === */
.spinner {
  width: 24px;
  height: 24px;
  border: 3px solid var(--border-color);
  border-top-color: var(--color-primary-500);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

.spinner-sm {
  width: 16px;
  height: 16px;
  border-width: 2px;
}

.spinner-small {
  width: 16px;
  height: 16px;
  border: 2px solid var(--border-color);
  border-top-color: var(--color-primary-500);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  display: inline-block;
  vertical-align: middle;
  margin-right: 6px;
}

.spinner-lg {
  width: 40px;
  height: 40px;
  border-width: 4px;
}

/* === Empty State === */
.empty-state {
  text-align: center;
  padding: var(--spacing-12) var(--spacing-4);
}

.empty-state-icon {
  width: 64px;
  height: 64px;
  color: var(--text-muted);
  margin-bottom: var(--spacing-4);
}

.empty-state-title {
  font-size: var(--text-lg);
  font-weight: var(--font-semibold);
  margin-bottom: var(--spacing-2);
}

.empty-state-description {
  color: var(--text-secondary);
  max-width: 400px;
  margin: 0 auto var(--spacing-4);
}

/* === Avatar === */
.avatar {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  overflow: hidden;
  background: var(--bg-tertiary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: var(--font-semibold);
  color: var(--text-secondary);
}

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

.avatar-sm { width: 32px; height: 32px; font-size: var(--text-sm); }
.avatar-lg { width: 56px; height: 56px; font-size: var(--text-xl); }
.avatar-xl { width: 80px; height: 80px; font-size: var(--text-2xl); }

/* === Stat Card === */
.stat-card {
  padding: var(--spacing-4);
}

.stat-label {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  margin-bottom: var(--spacing-1);
}

.stat-value {
  font-size: var(--text-3xl);
  font-weight: var(--font-bold);
  color: var(--text-primary);
}

.stat-change {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-1);
  font-size: var(--text-sm);
  margin-top: var(--spacing-1);
}

.stat-change.positive { color: var(--color-success-500); }
.stat-change.negative { color: var(--color-danger-500); }

/* === Skeleton Loading === */
.skeleton {
  background: linear-gradient(
    90deg,
    var(--bg-tertiary) 25%,
    var(--bg-hover) 50%,
    var(--bg-tertiary) 75%
  );
  background-size: 200% 100%;
  animation: skeleton-loading 1.5s infinite;
  border-radius: var(--radius-md);
}

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

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

.skeleton-text:last-child {
  width: 60%;
}

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

.skeleton-btn {
  height: 36px;
  width: 100px;
}