/* ==========================================================================
   MTI Dev-Support — Components
   All UI components using MTI Design System tokens
   Corporate personality: radius-sm, subtle hovers, letter-spacing 0.02em
   ========================================================================== */

/* ==========================================================================
   BUTTONS
   ========================================================================== */
.ds-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  letter-spacing: 0.02em;
  line-height: 1.5;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast), box-shadow var(--transition-fast);
  white-space: nowrap;
  user-select: none;
  text-decoration: none;
  outline: none;
  position: relative;
}

.ds-btn:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.ds-btn:disabled,
.ds-btn--disabled {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}

/* Primary */
.ds-btn--primary {
  background: var(--color-accent);
  color: var(--color-accent-text);
  border-color: var(--color-accent);
}

.ds-btn--primary:hover {
  background: var(--color-accent-hover);
  border-color: var(--color-accent-hover);
}

.ds-btn--primary:active {
  background: var(--color-accent-hover);
  box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.15);
}

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

.ds-btn--secondary:hover {
  background: var(--color-bg-hover);
  border-color: var(--color-accent);
}

.ds-btn--secondary:active {
  background: var(--color-bg-active);
}

/* Outline */
.ds-btn--outline {
  background: transparent;
  color: var(--color-accent);
  border-color: var(--color-accent);
}

.ds-btn--outline:hover {
  background: var(--color-accent-light);
}

.ds-btn--outline:active {
  background: var(--color-accent-light);
  box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.1);
}

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

.ds-btn--ghost:hover {
  background: var(--color-bg-hover);
  color: var(--color-text-primary);
}

.ds-btn--ghost:active {
  background: var(--color-bg-active);
}

/* Danger */
.ds-btn--danger {
  background: var(--color-danger);
  color: #ffffff;
  border-color: var(--color-danger);
}

.ds-btn--danger:hover {
  background: var(--color-danger-hover);
  border-color: var(--color-danger-hover);
}

.ds-btn--danger:active {
  box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.15);
}

/* Success */
.ds-btn--success {
  background: var(--color-success);
  color: #ffffff;
  border-color: var(--color-success);
}

.ds-btn--success:hover {
  opacity: 0.9;
}

.ds-btn--success:active {
  box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.15);
}

/* Sizes */
.ds-btn--sm {
  padding: var(--space-1) var(--space-3);
  font-size: var(--text-xs);
  gap: var(--space-1);
}

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

/* Icon-only button */
.ds-btn--icon {
  padding: var(--space-2);
  width: 36px;
  height: 36px;
}

.ds-btn--icon.ds-btn--sm {
  width: 28px;
  height: 28px;
  padding: var(--space-1);
}

.ds-btn--icon.ds-btn--lg {
  width: 44px;
  height: 44px;
  padding: var(--space-3);
}

/* Loading state */
.ds-btn--loading {
  color: transparent !important;
  pointer-events: none;
}

.ds-btn--loading::after {
  content: '';
  position: absolute;
  width: 16px;
  height: 16px;
  border: 2px solid currentColor;
  border-top-color: transparent;
  border-radius: var(--radius-full);
  animation: ds-spin 0.6s linear infinite;
}

.ds-btn--primary.ds-btn--loading::after {
  border-color: var(--color-accent-text);
  border-top-color: transparent;
}

/* Button group */
.ds-btn-group {
  display: inline-flex;
}

.ds-btn-group .ds-btn {
  border-radius: 0;
}

.ds-btn-group .ds-btn:first-child {
  border-radius: var(--radius-sm) 0 0 var(--radius-sm);
}

.ds-btn-group .ds-btn:last-child {
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.ds-btn-group .ds-btn + .ds-btn {
  margin-left: -1px;
}

/* ==========================================================================
   CARDS
   ========================================================================== */
.ds-card {
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-sm);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.ds-card:hover {
  border-color: var(--color-surface-border);
}

.ds-card--clickable {
  cursor: pointer;
}

.ds-card--clickable:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-md);
}

.ds-card__header {
  padding: var(--space-4) var(--space-5);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
}

.ds-card__header-title {
  font-size: var(--text-base);
  font-weight: var(--weight-semibold);
  color: var(--color-text-primary);
  letter-spacing: 0.02em;
}

.ds-card__body {
  padding: var(--space-4) var(--space-5);
}

.ds-card__footer {
  padding: var(--space-3) var(--space-5);
  border-top: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: var(--space-3);
}

/* ==========================================================================
   BADGES
   ========================================================================== */
.ds-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: 2px var(--space-2);
  font-size: var(--text-xs);
  font-weight: var(--weight-medium);
  letter-spacing: 0.02em;
  border-radius: var(--radius-sm);
  white-space: nowrap;
  line-height: 1.5;
}

/* Status badges */
.ds-badge--open {
  background: var(--ds-status-open-bg);
  color: var(--ds-status-open);
}

.ds-badge--in-progress {
  background: var(--ds-status-in-progress-bg);
  color: var(--ds-status-in-progress);
}

.ds-badge--under-review {
  background: var(--ds-status-under-review-bg);
  color: var(--ds-status-under-review);
}

.ds-badge--resolved {
  background: var(--ds-status-resolved-bg);
  color: var(--ds-status-resolved);
}

.ds-badge--closed {
  background: var(--ds-status-closed-bg);
  color: var(--ds-status-closed);
}

/* Priority badges */
.ds-badge--low {
  background: var(--ds-priority-low-bg);
  color: var(--ds-priority-low);
}

.ds-badge--medium {
  background: var(--ds-priority-medium-bg);
  color: var(--ds-priority-medium);
}

.ds-badge--high {
  background: var(--ds-priority-high-bg);
  color: var(--ds-priority-high);
}

.ds-badge--critical {
  background: var(--ds-priority-critical-bg);
  color: var(--ds-priority-critical);
}

/* Type badge */
.ds-badge--type {
  background: var(--color-bg-tertiary);
  color: var(--color-text-secondary);
  border: 1px solid var(--color-border);
}

/* Sizes */
.ds-badge--sm {
  padding: 1px var(--space-1);
  font-size: 10px;
}

.ds-badge--lg {
  padding: var(--space-1) var(--space-3);
  font-size: var(--text-sm);
}

/* Badge with dot indicator */
.ds-badge__dot {
  width: 6px;
  height: 6px;
  border-radius: var(--radius-full);
  background: currentColor;
  flex-shrink: 0;
}

/* ==========================================================================
   FORMS
   ========================================================================== */
.ds-form-group {
  margin-bottom: var(--space-4);
}

.ds-form-label {
  display: block;
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-2);
  letter-spacing: 0.02em;
}

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

.ds-form-input,
.ds-form-select,
.ds-form-textarea {
  width: 100%;
  padding: var(--space-2) var(--space-3);
  background: var(--color-input-bg);
  border: 1px solid var(--color-input-border);
  border-radius: var(--radius-sm);
  color: var(--color-text-primary);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  line-height: var(--leading-normal);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  outline: none;
}

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

.ds-form-input:focus,
.ds-form-select:focus,
.ds-form-textarea:focus {
  border-color: var(--color-input-focus);
  box-shadow: 0 0 0 3px var(--color-accent-light);
}

.ds-form-input:hover:not(:focus),
.ds-form-select:hover:not(:focus),
.ds-form-textarea:hover:not(:focus) {
  border-color: var(--color-text-tertiary);
}

/* Error state */
.ds-form-input--error,
.ds-form-input--error:focus {
  border-color: var(--color-danger);
  box-shadow: 0 0 0 3px var(--color-danger-light);
}

/* Success state */
.ds-form-input--success,
.ds-form-input--success:focus {
  border-color: var(--color-success);
  box-shadow: 0 0 0 3px var(--color-success-light);
}

.ds-form-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='%2364748b' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right var(--space-3) center;
  padding-right: var(--space-8);
  cursor: pointer;
}

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

.ds-form-hint {
  font-size: var(--text-xs);
  color: var(--color-text-tertiary);
  margin-top: var(--space-1);
}

.ds-form-error {
  font-size: var(--text-xs);
  color: var(--color-danger);
  margin-top: var(--space-1);
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

/* Checkbox & Radio */
.ds-form-check {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  cursor: pointer;
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
}

.ds-form-check input[type="checkbox"],
.ds-form-check input[type="radio"] {
  width: 16px;
  height: 16px;
  accent-color: var(--color-accent);
  cursor: pointer;
}

/* Input group */
.ds-input-group {
  display: flex;
  align-items: stretch;
}

.ds-input-group .ds-form-input {
  border-radius: 0;
}

.ds-input-group .ds-form-input:first-child {
  border-radius: var(--radius-sm) 0 0 var(--radius-sm);
}

.ds-input-group .ds-form-input:last-child {
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.ds-input-group__addon {
  display: flex;
  align-items: center;
  padding: var(--space-2) var(--space-3);
  background: var(--color-bg-tertiary);
  border: 1px solid var(--color-input-border);
  color: var(--color-text-tertiary);
  font-size: var(--text-sm);
  white-space: nowrap;
}

/* ==========================================================================
   MODALS
   ========================================================================== */
.ds-modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  z-index: var(--z-modal);
  display: none;
  align-items: center;
  justify-content: center;
  padding: var(--space-4);
}

.ds-modal-overlay--visible {
  display: flex;
  animation: ds-fade-in 0.2s ease-out;
}

.ds-modal {
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-2xl);
  width: 100%;
  max-width: 520px;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
  animation: ds-scale-in 0.2s ease-out;
}

.ds-modal--lg {
  max-width: 680px;
}

.ds-modal--xl {
  max-width: 900px;
}

.ds-modal__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4) var(--space-5);
  border-bottom: 1px solid var(--color-border);
  flex-shrink: 0;
}

.ds-modal__title {
  font-size: var(--text-lg);
  font-weight: var(--weight-semibold);
  color: var(--color-text-primary);
  letter-spacing: 0.02em;
}

.ds-modal__close {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border: none;
  background: none;
  color: var(--color-text-tertiary);
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: background var(--transition-fast), color var(--transition-fast);
  font-size: var(--text-lg);
}

.ds-modal__close:hover {
  background: var(--color-bg-hover);
  color: var(--color-text-primary);
}

.ds-modal__body {
  padding: var(--space-5);
  overflow-y: auto;
  flex: 1;
}

.ds-modal__footer {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-5);
  border-top: 1px solid var(--color-border);
  flex-shrink: 0;
}

/* ==========================================================================
   TABLES
   ========================================================================== */
.ds-table-container {
  width: 100%;
  overflow-x: auto;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
}

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

.ds-table th {
  text-align: left;
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-xs);
  font-weight: var(--weight-semibold);
  color: var(--color-text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  background: var(--color-bg-secondary);
  border-bottom: 1px solid var(--color-border);
  white-space: nowrap;
  position: sticky;
  top: 0;
  z-index: var(--z-raised);
}

.ds-table td {
  padding: var(--space-3) var(--space-4);
  color: var(--color-text-secondary);
  border-bottom: 1px solid var(--color-border-light);
  vertical-align: middle;
}

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

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

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

/* Striped rows */
.ds-table--striped tbody tr:nth-child(even) {
  background: var(--color-bg-secondary);
}

.ds-table--striped tbody tr:nth-child(even):hover {
  background: var(--color-bg-hover);
}

/* Sortable */
.ds-table__sort {
  cursor: pointer;
  user-select: none;
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
}

.ds-table__sort-icon {
  font-size: 10px;
  opacity: 0.4;
  transition: opacity var(--transition-fast);
}

.ds-table__sort:hover .ds-table__sort-icon,
.ds-table__sort--active .ds-table__sort-icon {
  opacity: 1;
}

.ds-table__sort--active {
  color: var(--color-accent);
}

/* Compact table */
.ds-table--compact th,
.ds-table--compact td {
  padding: var(--space-2) var(--space-3);
}

/* Scrollable table container (vertical) */
.ds-table-container--scroll {
  max-height: calc(100vh - 380px);
  overflow-y: auto;
}

/* ==========================================================================
   TOASTS
   ========================================================================== */
.ds-toast-container {
  position: fixed;
  top: var(--space-4);
  right: var(--space-4);
  z-index: var(--z-toast);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  pointer-events: none;
  max-width: 420px;
  width: 100%;
}

.ds-toast {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-lg);
  pointer-events: auto;
  animation: ds-slide-in-right 0.3s ease-out;
  position: relative;
}

.ds-toast--success {
  border-left: 3px solid var(--color-success);
}

.ds-toast--error {
  border-left: 3px solid var(--color-danger);
}

.ds-toast--warning {
  border-left: 3px solid var(--color-warning);
}

.ds-toast--info {
  border-left: 3px solid var(--color-info);
}

.ds-toast__icon {
  flex-shrink: 0;
  font-size: var(--text-lg);
  line-height: 1;
  margin-top: 1px;
}

.ds-toast--success .ds-toast__icon { color: var(--color-success); }
.ds-toast--error .ds-toast__icon { color: var(--color-danger); }
.ds-toast--warning .ds-toast__icon { color: var(--color-warning); }
.ds-toast--info .ds-toast__icon { color: var(--color-info); }

.ds-toast__content {
  flex: 1;
  min-width: 0;
}

.ds-toast__title {
  font-size: var(--text-sm);
  font-weight: var(--weight-semibold);
  color: var(--color-text-primary);
  margin-bottom: 2px;
}

.ds-toast__message {
  font-size: var(--text-xs);
  color: var(--color-text-secondary);
  line-height: var(--leading-normal);
}

.ds-toast__close {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  border: none;
  background: none;
  color: var(--color-text-tertiary);
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast);
}

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

.ds-toast--exiting {
  animation: ds-slide-out-right 0.2s ease-in forwards;
}

/* ==========================================================================
   TABS
   ========================================================================== */
.ds-tabs {
  display: flex;
  border-bottom: 1px solid var(--color-border);
  gap: 0;
  overflow-x: auto;
}

.ds-tab {
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  color: var(--color-text-secondary);
  cursor: pointer;
  border: none;
  background: none;
  position: relative;
  white-space: nowrap;
  transition: color var(--transition-fast);
  letter-spacing: 0.02em;
}

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

.ds-tab--active {
  color: var(--color-accent);
}

.ds-tab--active::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--color-accent);
  border-radius: 2px 2px 0 0;
}

.ds-tab__count {
  margin-left: var(--space-2);
  padding: 1px var(--space-2);
  font-size: 10px;
  font-weight: var(--weight-semibold);
  background: var(--color-bg-tertiary);
  border-radius: var(--radius-full);
  color: var(--color-text-tertiary);
}

.ds-tab--active .ds-tab__count {
  background: var(--color-accent-light);
  color: var(--color-accent);
}

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

.ds-dropdown__menu {
  position: absolute;
  top: calc(100% + var(--space-1));
  left: 0;
  min-width: 200px;
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-lg);
  z-index: var(--z-dropdown);
  padding: var(--space-1) 0;
  animation: ds-fade-in 0.15s ease-out;
  display: none;
}

.ds-dropdown__menu--right {
  left: auto;
  right: 0;
}

.ds-dropdown__menu--visible,
.ds-dropdown--open .ds-dropdown__menu {
  display: block;
}

.ds-dropdown__item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: background var(--transition-fast), color var(--transition-fast);
  border: none;
  background: none;
  width: 100%;
  text-align: left;
}

.ds-dropdown__item:hover {
  background: var(--color-bg-hover);
  color: var(--color-text-primary);
}

.ds-dropdown__item--active {
  color: var(--color-accent);
  background: var(--color-accent-light);
}

.ds-dropdown__item--danger {
  color: var(--color-danger);
}

.ds-dropdown__item--danger:hover {
  background: var(--color-danger-light);
  color: var(--color-danger);
}

.ds-dropdown__divider {
  height: 1px;
  background: var(--color-border);
  margin: var(--space-1) 0;
}

.ds-dropdown__label {
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-xs);
  font-weight: var(--weight-semibold);
  color: var(--color-text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

/* ==========================================================================
   AVATARS
   ========================================================================== */
.ds-avatar {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-sm);
  font-weight: var(--weight-semibold);
  background: var(--color-accent-light);
  color: var(--color-accent);
  flex-shrink: 0;
  position: relative;
  overflow: hidden;
}

.ds-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: var(--radius-full);
}

.ds-avatar--sm {
  width: 32px;
  height: 32px;
  font-size: var(--text-xs);
}

.ds-avatar--lg {
  width: 56px;
  height: 56px;
  font-size: var(--text-lg);
}

.ds-avatar--xl {
  width: 72px;
  height: 72px;
  font-size: var(--text-xl);
}

.ds-avatar__status {
  position: absolute;
  bottom: 0;
  right: 0;
  width: 12px;
  height: 12px;
  border-radius: var(--radius-full);
  border: 2px solid var(--color-bg-elevated);
}

.ds-avatar__status--online { background: var(--color-success); }
.ds-avatar__status--offline { background: var(--color-text-tertiary); }
.ds-avatar__status--busy { background: var(--color-danger); }
.ds-avatar__status--away { background: var(--color-warning); }

.ds-avatar-group {
  display: flex;
  flex-direction: row-reverse;
}

.ds-avatar-group .ds-avatar {
  border: 2px solid var(--color-bg-elevated);
  margin-right: -8px;
}

.ds-avatar-group .ds-avatar:first-child {
  margin-right: 0;
}

.ds-avatar-group__overflow {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-bg-tertiary);
  color: var(--color-text-secondary);
  font-size: var(--text-xs);
  font-weight: var(--weight-semibold);
  border: 2px solid var(--color-bg-elevated);
  margin-right: -8px;
}

/* ==========================================================================
   EMPTY STATE
   ========================================================================== */
.ds-empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--space-12) var(--space-6);
}

.ds-empty-state__icon {
  font-size: 3rem;
  margin-bottom: var(--space-4);
  opacity: 0.5;
  color: var(--color-text-tertiary);
}

.ds-empty-state__title {
  font-size: var(--text-lg);
  font-weight: var(--weight-semibold);
  color: var(--color-text-primary);
  margin-bottom: var(--space-2);
}

.ds-empty-state__text {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  max-width: 400px;
  margin-bottom: var(--space-6);
  line-height: var(--leading-relaxed);
}

.ds-empty-state__action {
  display: flex;
  gap: var(--space-3);
}

/* ==========================================================================
   LOADING
   ========================================================================== */

/* Spinner */
.ds-spinner {
  width: 24px;
  height: 24px;
  border: 2px solid var(--color-border);
  border-top-color: var(--color-accent);
  border-radius: var(--radius-full);
  animation: ds-spin 0.6s linear infinite;
  flex-shrink: 0;
}

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

.ds-spinner--lg {
  width: 40px;
  height: 40px;
  border-width: 3px;
}

/* Skeleton */
.ds-skeleton {
  background: var(--color-bg-tertiary);
  border-radius: var(--radius-sm);
  position: relative;
  overflow: hidden;
}

.ds-skeleton::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(255, 255, 255, 0.04),
    transparent
  );
  animation: ds-shimmer 1.5s infinite;
}

.ds-skeleton--text {
  height: 14px;
  width: 100%;
  margin-bottom: var(--space-2);
}

.ds-skeleton--text:last-child {
  width: 70%;
}

.ds-skeleton--heading {
  height: 24px;
  width: 40%;
  margin-bottom: var(--space-3);
}

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

.ds-skeleton--card {
  height: 120px;
  width: 100%;
}

/* Loading state (centered spinner + text) */
.ds-loading-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-8) var(--space-4);
  text-align: center;
}

/* Settings panel */
.ds-settings-panel {
  animation: ds-fade-in 0.2s ease-out;
}

/* Loading overlay */
.ds-loading-overlay {
  position: fixed;
  inset: 0;
  background: rgba(10, 15, 26, 0.8);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: var(--space-4);
  z-index: var(--z-loading);
}

.ds-loading-overlay__text {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  letter-spacing: 0.02em;
}

/* ==========================================================================
   TOOLTIP
   ========================================================================== */
.ds-tooltip {
  position: relative;
}

.ds-tooltip__content {
  position: absolute;
  bottom: calc(100% + var(--space-2));
  left: 50%;
  transform: translateX(-50%);
  padding: var(--space-1) var(--space-2);
  background: var(--color-bg-active);
  color: var(--color-text-primary);
  font-size: var(--text-xs);
  border-radius: var(--radius-sm);
  white-space: nowrap;
  z-index: var(--z-tooltip);
  pointer-events: none;
  opacity: 0;
  transition: opacity var(--transition-fast);
  box-shadow: var(--shadow-md);
}

.ds-tooltip:hover .ds-tooltip__content {
  opacity: 1;
}

/* ==========================================================================
   DIVIDER
   ========================================================================== */
.ds-divider {
  height: 1px;
  background: var(--color-border);
  border: none;
  margin: var(--space-4) 0;
}

.ds-divider--light {
  background: var(--color-border-light);
}

.ds-divider--thick {
  height: 2px;
}

/* ==========================================================================
   TAG / CHIP
   ========================================================================== */
.ds-tag {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-2);
  font-size: var(--text-xs);
  font-weight: var(--weight-medium);
  color: var(--color-text-secondary);
  background: var(--color-bg-tertiary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  white-space: nowrap;
}

.ds-tag__remove {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 14px;
  height: 14px;
  border: none;
  background: none;
  color: var(--color-text-tertiary);
  cursor: pointer;
  border-radius: var(--radius-sm);
  font-size: 10px;
  transition: color var(--transition-fast);
}

.ds-tag__remove:hover {
  color: var(--color-danger);
}

/* ==========================================================================
   INLINE SELECT (toolbar / filter selects)
   ========================================================================== */
.ds-select {
  appearance: none;
  padding: var(--space-2) var(--space-8) var(--space-2) var(--space-3);
  background: var(--color-input-bg);
  border: 1px solid var(--color-input-border);
  border-radius: var(--radius-sm);
  color: var(--color-text-primary);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  line-height: var(--leading-normal);
  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='%2364748b' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right var(--space-3) center;
  cursor: pointer;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  outline: none;
}

.ds-select:focus {
  border-color: var(--color-input-focus);
  box-shadow: 0 0 0 3px var(--color-accent-light);
}

.ds-select:hover:not(:focus) {
  border-color: var(--color-text-tertiary);
}

.ds-select--sm {
  padding: var(--space-1) var(--space-7) var(--space-1) var(--space-2);
  font-size: var(--text-xs);
}

/* Form select small */
.ds-form-select--sm {
  padding: var(--space-1) var(--space-7) var(--space-1) var(--space-2);
  font-size: var(--text-xs);
}

/* Form input small */
.ds-form-input--sm {
  padding: var(--space-1) var(--space-2);
  font-size: var(--text-xs);
}

/* ==========================================================================
   ANIMATIONS
   ========================================================================== */
@keyframes ds-spin {
  to { transform: rotate(360deg); }
}

@keyframes ds-fade-in {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes ds-scale-in {
  from {
    opacity: 0;
    transform: scale(0.95);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

@keyframes ds-slide-in-right {
  from {
    opacity: 0;
    transform: translateX(100%);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes ds-slide-out-right {
  from {
    opacity: 1;
    transform: translateX(0);
  }
  to {
    opacity: 0;
    transform: translateX(100%);
  }
}

@keyframes ds-shimmer {
  0% { transform: translateX(-100%); }
  100% { transform: translateX(100%); }
}

@keyframes ds-slide-up {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

/* ==========================================================================
   TOOLBAR
   ========================================================================== */
.ds-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-sm);
  margin-bottom: var(--space-4);
  flex-wrap: wrap;
}

.ds-toolbar__left {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex-shrink: 0;
}

.ds-toolbar__right {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-wrap: wrap;
}

/* ==========================================================================
   SEARCH
   ========================================================================== */
.ds-search {
  position: relative;
  display: flex;
  align-items: center;
}

.ds-search__icon {
  position: absolute;
  left: var(--space-3);
  top: 50%;
  transform: translateY(-50%);
  font-size: var(--text-sm);
  pointer-events: none;
  opacity: 0.5;
  z-index: 1;
}

.ds-search__input {
  width: 100%;
  padding: var(--space-2) var(--space-3) var(--space-2) var(--space-9);
  background: var(--color-input-bg);
  border: 1px solid var(--color-input-border);
  border-radius: var(--radius-sm);
  color: var(--color-text-primary);
  font-size: var(--text-sm);
  font-family: var(--font-body);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  outline: none;
  min-width: 180px;
}

.ds-search__input::placeholder {
  color: var(--color-input-placeholder);
}

.ds-search__input:focus {
  border-color: var(--color-accent);
}

.ds-search--sm .ds-search__input {
  padding: var(--space-1) var(--space-3) var(--space-1) var(--space-8);
  font-size: var(--text-xs);
  min-width: 160px;
}

.ds-search--sm .ds-search__icon {
  left: var(--space-2);
  font-size: var(--text-xs);
}

/* ==========================================================================
   BUTTON GROUP
   ========================================================================== */
.ds-btn-group {
  display: inline-flex;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.ds-btn-group .ds-btn-group__item {
  border-radius: 0;
  border: none;
  border-right: 1px solid var(--color-border);
}

.ds-btn-group .ds-btn-group__item:last-child {
  border-right: none;
}

.ds-btn-group__item--active {
  background: var(--color-bg-hover) !important;
  color: var(--color-accent) !important;
}

/* ==========================================================================
   RESPONSIVE — Toolbar
   ========================================================================== */
@media (max-width: 1023px) {
  .ds-tabs {
    gap: 0;
    -webkit-overflow-scrolling: touch;
  }

  .ds-tab {
    padding: var(--space-2) var(--space-3);
    font-size: var(--text-xs);
  }

  .ds-select,
  .ds-select--sm {
    font-size: var(--text-xs);
  }
}

@media (max-width: 767px) {
  .ds-toolbar {
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-2);
    padding: var(--space-3);
  }

  .ds-toolbar__right {
    flex-wrap: wrap;
  }

  .ds-search__input,
  .ds-search--sm .ds-search__input {
    min-width: 0;
    width: 100%;
  }

  .ds-select {
    width: 100%;
  }

  .ds-table-container--scroll {
    max-height: calc(100vh - 320px);
  }

  .ds-card--filter-bar .flex-wrap {
    gap: var(--space-2);
  }

  .ds-card--filter-bar .ds-form-group {
    min-width: 100% !important;
  }
}

@media (max-width: 479px) {
  .ds-tabs {
    flex-wrap: nowrap;
  }

  .ds-tab {
    padding: var(--space-2);
    font-size: 11px;
  }

  .ds-table th,
  .ds-table td {
    padding: var(--space-2);
    font-size: var(--text-xs);
  }

  .ds-select {
    padding: var(--space-1) var(--space-6) var(--space-1) var(--space-2);
    font-size: 11px;
  }
}