/**
 * Nucleora Component Library
 * ==========================
 * Reusable UI components using BEM naming convention.
 * Built on design-tokens.css — import that file first.
 * 
 * Components:
 * - .btn (buttons)
 * - .card (content containers)
 * - .modal (dialogs/overlays)
 * - .form-* (form elements)
 * - .table (data tables)
 * - .alert (status messages)
 * - .badge (labels/tags)
 * - .tooltip (hover hints)
 */

/* ═══════════════════════════════════════════════════════════════════════════
   BUTTONS
   ═══════════════════════════════════════════════════════════════════════════ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-1-5);
  height: var(--btn-height-md);
  padding: 0 var(--btn-padding-x-md);
  font-family: var(--font-family-sans);
  font-size: var(--btn-font-size-md);
  font-weight: var(--font-weight-medium);
  line-height: 1;
  text-decoration: none;
  white-space: nowrap;
  cursor: pointer;
  user-select: none;
  border: var(--border-width-1) solid transparent;
  border-radius: var(--btn-border-radius);
  transition: var(--transition-colors), box-shadow var(--transition-fast);
  
  /* Default: secondary style */
  background-color: var(--color-bg-surface);
  border-color: var(--color-border-default);
  color: var(--color-text-primary);
}

.btn:hover {
  background-color: var(--color-bg-raised);
  border-color: var(--color-border-strong);
}

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

.btn:focus-visible {
  outline: none;
  box-shadow: var(--shadow-focus);
}

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

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

.btn--primary:hover {
  background-color: var(--color-primary-800);
  border-color: var(--color-primary-800);
}

.btn--primary:active {
  background-color: var(--color-primary-900);
  border-color: var(--color-primary-900);
}

/* --- Secondary button (explicit) --- */
.btn--secondary {
  background-color: var(--color-bg-surface);
  border-color: var(--color-border-default);
  color: var(--color-text-primary);
}

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

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

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

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

/* --- Danger button --- */
.btn--danger {
  background-color: var(--color-error);
  border-color: var(--color-error);
  color: var(--color-text-inverse);
}

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

.btn--danger:active {
  background-color: #5f110e;
  border-color: #5f110e;
}

/* --- Success button --- */
.btn--success {
  background-color: var(--color-success);
  border-color: var(--color-success);
  color: var(--color-text-inverse);
}

.btn--success:hover {
  background-color: var(--color-success-dark);
  border-color: var(--color-success-dark);
}

/* --- Size variants --- */
.btn--sm {
  height: var(--btn-height-sm);
  padding: 0 var(--btn-padding-x-sm);
  font-size: var(--btn-font-size-sm);
  gap: var(--space-1);
}

.btn--lg {
  height: var(--btn-height-lg);
  padding: 0 var(--btn-padding-x-lg);
  font-size: var(--btn-font-size-lg);
  gap: var(--space-2);
}

/* --- Icon-only button --- */
.btn--icon {
  width: var(--btn-height-md);
  padding: 0;
}

.btn--icon.btn--sm {
  width: var(--btn-height-sm);
}

.btn--icon.btn--lg {
  width: var(--btn-height-lg);
}

/* --- Full-width button --- */
.btn--block {
  display: flex;
  width: 100%;
}

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

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

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

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

.btn-group .btn:not(:last-child) {
  border-right-width: 0;
}

.btn-group .btn:hover,
.btn-group .btn:focus {
  position: relative;
  z-index: 1;
}

/* ═══════════════════════════════════════════════════════════════════════════
   CARDS
   ═══════════════════════════════════════════════════════════════════════════ */

.card {
  background-color: var(--color-bg-surface);
  border: var(--card-border-width) solid var(--color-border-light);
  border-radius: var(--card-border-radius);
  /* Per app.css philosophy: cards get borders, not shadows */
}

.card--elevated {
  box-shadow: var(--shadow-md);
  border-color: transparent;
}

.card--interactive {
  cursor: pointer;
  transition: var(--transition-colors), box-shadow var(--transition-normal);
}

.card--interactive:hover {
  border-color: var(--color-border-default);
  box-shadow: var(--shadow-sm);
}

.card--interactive:active {
  background-color: var(--color-bg-raised);
}

.card--selected {
  border-color: var(--color-primary);
  background-color: var(--color-selected-bg);
}

.card__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding: var(--card-padding);
  border-bottom: var(--border-width-1) solid var(--color-border-light);
}

.card__header--compact {
  padding: var(--card-padding-sm);
}

.card__title {
  margin: 0;
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  line-height: var(--line-height-tight);
}

.card__subtitle {
  margin: var(--space-0-5) 0 0;
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.card__actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-shrink: 0;
}

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

.card__body--compact {
  padding: var(--card-padding-sm);
}

.card__body--flush {
  padding: 0;
}

.card__footer {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: var(--space-2);
  padding: var(--card-padding);
  border-top: var(--border-width-1) solid var(--color-border-light);
  background-color: var(--color-bg-base);
  border-radius: 0 0 var(--card-border-radius) var(--card-border-radius);
}

.card__footer--compact {
  padding: var(--card-padding-sm);
}

.card__footer--spread {
  justify-content: space-between;
}

/* --- Card sizes --- */
.card--sm {
  --card-padding: var(--space-3);
}

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

/* ═══════════════════════════════════════════════════════════════════════════
   MODALS
   ═══════════════════════════════════════════════════════════════════════════ */

.modal {
  position: fixed;
  inset: 0;
  z-index: var(--z-modal);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-4);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-moderate), visibility var(--transition-moderate);
}

.modal--open {
  opacity: 1;
  visibility: visible;
}

.modal__overlay {
  position: absolute;
  inset: 0;
  background-color: var(--n-scrim, rgba(19, 24, 29, 0.55));
  z-index: -1;
}

.modal__content {
  position: relative;
  width: 100%;
  max-width: var(--modal-max-width-md);
  max-height: calc(100vh - var(--space-8));
  background-color: var(--color-bg-surface);
  border-radius: var(--modal-border-radius);
  box-shadow: var(--shadow-2xl);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transform: scale(0.95) translateY(var(--space-2));
  transition: transform var(--transition-moderate);
}

.modal--open .modal__content {
  transform: scale(1) translateY(0);
}

.modal__content--sm {
  max-width: var(--modal-max-width-sm);
}

.modal__content--lg {
  max-width: var(--modal-max-width-lg);
}

.modal__content--xl {
  max-width: var(--modal-max-width-xl);
}

.modal__content--fullscreen {
  max-width: none;
  max-height: none;
  width: calc(100vw - var(--space-8));
  height: calc(100vh - var(--space-8));
  border-radius: var(--radius-lg);
}

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

.modal__title {
  margin: 0;
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  line-height: var(--line-height-tight);
}

.modal__close {
  flex-shrink: 0;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: none;
  border-radius: var(--radius-md);
  color: var(--color-text-tertiary);
  cursor: pointer;
  transition: var(--transition-colors);
}

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

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

.modal__footer {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: var(--space-3);
  padding: var(--modal-padding);
  padding-top: var(--space-4);
  border-top: var(--border-width-1) solid var(--color-border-light);
  background-color: var(--color-bg-base);
  flex-shrink: 0;
}

.modal__footer--spread {
  justify-content: space-between;
}

/* ═══════════════════════════════════════════════════════════════════════════
   FORMS
   ═══════════════════════════════════════════════════════════════════════════ */

.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-1-5);
}

.form-group + .form-group {
  margin-top: var(--space-4);
}

.form-row {
  display: flex;
  gap: var(--space-4);
}

.form-row > .form-group {
  flex: 1;
  margin-top: 0;
}

.form-label {
  display: block;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
  line-height: var(--line-height-snug);
}

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

.form-hint {
  font-size: var(--font-size-xs);
  color: var(--color-text-tertiary);
  line-height: var(--line-height-normal);
}

.form-error {
  font-size: var(--font-size-xs);
  color: var(--color-error);
  line-height: var(--line-height-normal);
}

/* --- Input base styles --- */
.form-input,
.form-select,
.form-textarea {
  width: 100%;
  height: var(--input-height-md);
  padding: var(--input-padding-y) var(--input-padding-x);
  font-family: var(--font-family-sans);
  font-size: var(--font-size-sm);
  line-height: var(--line-height-normal);
  color: var(--color-text-primary);
  background-color: var(--color-bg-raised);
  border: var(--input-border-width) solid var(--color-border-default);
  border-radius: var(--input-border-radius);
  transition: var(--transition-colors), box-shadow var(--transition-fast);
}

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

.form-input:hover,
.form-select:hover,
.form-textarea:hover {
  border-color: var(--color-border-strong);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--color-border-focus);
  box-shadow: var(--shadow-focus);
  background-color: var(--color-bg-surface);
}

.form-input:disabled,
.form-select:disabled,
.form-textarea:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  background-color: var(--color-bg-overlay);
}

/* --- Error state --- */
.form-input--error,
.form-select--error,
.form-textarea--error {
  border-color: var(--color-error);
}

.form-input--error:focus,
.form-select--error:focus,
.form-textarea--error:focus {
  box-shadow: var(--shadow-focus-error);
}

/* --- Size variants --- */
.form-input--sm,
.form-select--sm {
  height: var(--input-height-sm);
  padding: var(--space-1) var(--space-2);
  font-size: var(--font-size-xs);
}

.form-input--lg,
.form-select--lg {
  height: var(--input-height-lg);
  padding: var(--space-3) var(--space-4);
  font-size: var(--font-size-base);
}

/* --- Textarea --- */
.form-textarea {
  height: auto;
  min-height: 80px;
  resize: vertical;
}

.form-textarea--mono {
  font-family: var(--font-family-mono);
  font-size: var(--font-size-xs);
}

/* --- Select --- */
.form-select {
  appearance: none;
  padding-right: var(--space-8);
  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='%236b747e' d='M2.5 4.5L6 8l3.5-3.5'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right var(--space-3) center;
  cursor: pointer;
}

/* --- Checkbox & Radio --- */
.form-check {
  display: flex;
  align-items: flex-start;
  gap: var(--space-2);
}

.form-check-input {
  flex-shrink: 0;
  width: 16px;
  height: 16px;
  margin-top: 2px;
  appearance: none;
  background-color: var(--color-bg-raised);
  border: var(--input-border-width) solid var(--color-border-default);
  cursor: pointer;
  transition: var(--transition-colors);
}

.form-check-input[type="checkbox"] {
  border-radius: var(--radius-xs);
}

.form-check-input[type="radio"] {
  border-radius: var(--radius-full);
}

.form-check-input:hover {
  border-color: var(--color-border-strong);
}

.form-check-input:checked {
  background-color: var(--color-primary);
  border-color: var(--color-primary);
}

.form-check-input[type="checkbox"]:checked {
  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='white' d='M10 3L4.5 8.5L2 6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: center;
}

.form-check-input[type="radio"]:checked {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='8' height='8' viewBox='0 0 8 8'%3E%3Ccircle cx='4' cy='4' r='3' fill='white'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: center;
}

.form-check-input:focus-visible {
  outline: none;
  box-shadow: var(--shadow-focus);
}

.form-check-label {
  font-size: var(--font-size-sm);
  color: var(--color-text-primary);
  line-height: var(--line-height-normal);
  cursor: pointer;
}

/* --- Toggle/Switch --- */
.form-switch {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
}

.form-switch-input {
  appearance: none;
  width: 36px;
  height: 20px;
  background-color: var(--color-bg-overlay);
  border: none;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: background-color var(--transition-fast);
}

.form-switch-input::after {
  content: "";
  position: absolute;
  top: 2px;
  left: 2px;
  width: 16px;
  height: 16px;
  background-color: var(--color-bg-surface);
  border-radius: var(--radius-full);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-fast);
}

.form-switch-input:checked {
  background-color: var(--color-primary);
}

.form-switch-input:checked::after {
  transform: translateX(16px);
}

.form-switch-input:focus-visible {
  outline: none;
  box-shadow: var(--shadow-focus);
}

/* ═══════════════════════════════════════════════════════════════════════════
   TABLES
   ═══════════════════════════════════════════════════════════════════════════ */

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

.table__header {
  background-color: var(--table-header-bg);
}

.table__header th {
  padding: var(--table-cell-padding-y) var(--table-cell-padding-x);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  text-align: left;
  border-bottom: var(--border-width-1) solid var(--color-border-default);
  white-space: nowrap;
}

.table__header th--sortable {
  cursor: pointer;
  user-select: none;
}

.table__header th--sortable:hover {
  color: var(--color-text-primary);
}

.table__row {
  transition: background-color var(--transition-fast);
}

.table__row:hover {
  background-color: var(--table-hover-bg);
}

.table__row--selected {
  background-color: var(--color-selected-bg);
}

.table__row--selected:hover {
  background-color: var(--color-selected-hover-bg);
}

.table__cell {
  padding: var(--table-cell-padding-y) var(--table-cell-padding-x);
  color: var(--color-text-primary);
  border-bottom: var(--border-width-1) solid var(--color-border-light);
  vertical-align: middle;
}

.table__cell--mono {
  font-family: var(--font-family-mono);
  font-size: var(--font-size-xs);
}

.table__cell--muted {
  color: var(--color-text-secondary);
}

.table__cell--right {
  text-align: right;
}

.table__cell--center {
  text-align: center;
}

.table__cell--nowrap {
  white-space: nowrap;
}

/* --- Striped variant --- */
.table--striped .table__row:nth-child(even) {
  background-color: var(--table-stripe-bg);
}

/* --- Bordered variant --- */
.table--bordered {
  border: var(--border-width-1) solid var(--color-border-light);
}

.table--bordered .table__cell,
.table--bordered .table__header th {
  border: var(--border-width-1) solid var(--color-border-light);
}

/* --- Compact variant --- */
.table--compact .table__header th,
.table--compact .table__cell {
  padding: var(--space-1-5) var(--space-2);
  font-size: var(--font-size-xs);
}

/* ═══════════════════════════════════════════════════════════════════════════
   ALERTS
   ═══════════════════════════════════════════════════════════════════════════ */

.alert {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  line-height: var(--line-height-normal);
  border: var(--border-width-1) solid transparent;
}

.alert__icon {
  flex-shrink: 0;
  width: 18px;
  height: 18px;
  margin-top: 1px;
}

.alert__content {
  flex: 1;
  min-width: 0;
}

.alert__title {
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--space-0-5);
}

.alert__dismiss {
  flex-shrink: 0;
  padding: var(--space-1);
  margin: calc(-1 * var(--space-1));
  background: transparent;
  border: none;
  border-radius: var(--radius-sm);
  color: inherit;
  opacity: 0.7;
  cursor: pointer;
  transition: opacity var(--transition-fast);
}

.alert__dismiss:hover {
  opacity: 1;
}

/* --- Info variant (default) --- */
.alert--info {
  background-color: var(--color-info-light);
  border-color: rgba(23, 69, 124, 0.2);
  color: var(--color-info-dark);
}

/* --- Success variant --- */
.alert--success {
  background-color: var(--color-success-light);
  border-color: rgba(11, 107, 69, 0.2);
  color: var(--color-success-dark);
}

/* --- Warning variant --- */
.alert--warning {
  background-color: var(--color-warning-light);
  border-color: rgba(122, 82, 6, 0.2);
  color: var(--color-warning-dark);
}

/* --- Error variant --- */
.alert--error {
  background-color: var(--color-error-light);
  border-color: rgba(169, 31, 22, 0.2);
  color: var(--color-error-dark);
}

/* ═══════════════════════════════════════════════════════════════════════════
   BADGES
   ═══════════════════════════════════════════════════════════════════════════ */

.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--badge-padding-y) var(--badge-padding-x);
  font-family: var(--font-family-sans);
  font-size: var(--badge-font-size);
  font-weight: var(--badge-font-weight);
  line-height: 1;
  white-space: nowrap;
  border-radius: var(--badge-border-radius);
  
  /* Default: neutral/gray */
  background-color: var(--color-bg-overlay);
  color: var(--color-text-secondary);
}

.badge--primary {
  background-color: var(--color-primary);
  color: var(--color-text-on-primary);
}

.badge--secondary {
  background-color: var(--color-secondary-100);
  color: var(--color-secondary-800);
}

.badge--success {
  background-color: var(--color-success-light);
  color: var(--color-success-dark);
}

.badge--warning {
  background-color: var(--color-warning-light);
  color: var(--color-warning-dark);
}

.badge--error {
  background-color: var(--color-error-light);
  color: var(--color-error-dark);
}

.badge--info {
  background-color: var(--color-info-light);
  color: var(--color-info-dark);
}

/* --- Outline variants --- */
.badge--outline {
  background-color: transparent;
  border: var(--border-width-1) solid currentColor;
}

/* --- Dot indicator --- */
.badge__dot {
  width: 6px;
  height: 6px;
  border-radius: var(--radius-full);
  background-color: currentColor;
}

/* --- Size variants --- */
.badge--sm {
  padding: 2px var(--space-1-5);
  font-size: var(--font-size-2xs);
}

.badge--lg {
  padding: var(--space-1) var(--space-2-5);
  font-size: var(--font-size-sm);
}

/* ═══════════════════════════════════════════════════════════════════════════
   TOOLTIPS
   ═══════════════════════════════════════════════════════════════════════════ */

.tooltip {
  position: relative;
  display: inline-block;
}

.tooltip__content {
  position: absolute;
  z-index: var(--z-tooltip);
  padding: var(--tooltip-padding-y) var(--tooltip-padding-x);
  font-family: var(--font-family-sans);
  font-size: var(--tooltip-font-size);
  font-weight: var(--font-weight-normal);
  line-height: var(--line-height-snug);
  white-space: nowrap;
  color: var(--tooltip-color);
  background-color: var(--tooltip-bg);
  border-radius: var(--tooltip-border-radius);
  box-shadow: var(--shadow-lg);
  pointer-events: none;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-fast), visibility var(--transition-fast);
}

/* --- Positioning --- */
.tooltip__content--top {
  bottom: 100%;
  left: 50%;
  transform: translateX(-50%);
  margin-bottom: var(--space-1-5);
}

.tooltip__content--bottom {
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  margin-top: var(--space-1-5);
}

.tooltip__content--left {
  right: 100%;
  top: 50%;
  transform: translateY(-50%);
  margin-right: var(--space-1-5);
}

.tooltip__content--right {
  left: 100%;
  top: 50%;
  transform: translateY(-50%);
  margin-left: var(--space-1-5);
}

/* --- Show on hover --- */
.tooltip:hover .tooltip__content,
.tooltip:focus-within .tooltip__content {
  opacity: 1;
  visibility: visible;
}

/* --- Arrow (optional) --- */
.tooltip__content::after {
  content: "";
  position: absolute;
  border: 5px solid transparent;
}

.tooltip__content--top::after {
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  border-top-color: var(--tooltip-bg);
}

.tooltip__content--bottom::after {
  bottom: 100%;
  left: 50%;
  transform: translateX(-50%);
  border-bottom-color: var(--tooltip-bg);
}

.tooltip__content--left::after {
  left: 100%;
  top: 50%;
  transform: translateY(-50%);
  border-left-color: var(--tooltip-bg);
}

.tooltip__content--right::after {
  right: 100%;
  top: 50%;
  transform: translateY(-50%);
  border-right-color: var(--tooltip-bg);
}

/* ═══════════════════════════════════════════════════════════════════════════
   DIVIDERS
   ═══════════════════════════════════════════════════════════════════════════ */

.divider {
  height: var(--border-width-1);
  background-color: var(--color-border-light);
  border: none;
  margin: var(--space-4) 0;
}

.divider--strong {
  background-color: var(--color-border-default);
}

.divider--vertical {
  width: var(--border-width-1);
  height: auto;
  align-self: stretch;
  margin: 0 var(--space-4);
}

/* ═══════════════════════════════════════════════════════════════════════════
   SKELETON LOADERS
   ═══════════════════════════════════════════════════════════════════════════ */

.skeleton {
  background: linear-gradient(
    90deg,
    var(--color-bg-raised) 25%,
    var(--color-bg-overlay) 50%,
    var(--color-bg-raised) 75%
  );
  background-size: 200% 100%;
  animation: skeleton-shimmer 1.5s ease-in-out infinite;
  border-radius: var(--radius-sm);
}

.skeleton--text {
  height: 1em;
  width: 100%;
}

.skeleton--circle {
  border-radius: var(--radius-full);
}

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

/* ═══════════════════════════════════════════════════════════════════════════
   SPINNER
   ═══════════════════════════════════════════════════════════════════════════ */

.spinner {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 2px solid var(--color-border-light);
  border-top-color: var(--color-primary);
  border-radius: var(--radius-full);
  animation: spinner-rotate 0.8s linear infinite;
}

.spinner--sm {
  width: 14px;
  height: 14px;
  border-width: 1.5px;
}

.spinner--lg {
  width: 32px;
  height: 32px;
  border-width: 3px;
}

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

/* ═══════════════════════════════════════════════════════════════════════════
   EMPTY STATE
   ═══════════════════════════════════════════════════════════════════════════ */

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

.empty-state__icon {
  width: 48px;
  height: 48px;
  margin-bottom: var(--space-4);
  color: var(--color-text-tertiary);
}

.empty-state__title {
  margin: 0 0 var(--space-2);
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
}

.empty-state__description {
  margin: 0 0 var(--space-6);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  max-width: 320px;
}