/* ============================================================
   Shared UI — Toast, Loading, Empty, Context Menu, A11y
   ============================================================ */

/* Skip link */
.skip-link {
  position: absolute;
  top: -100px;
  left: 16px;
  z-index: 1000;
  padding: 10px 16px;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-inverse);
  background: var(--color-accent);
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: top var(--duration-fast) var(--ease-out);
}

.skip-link:focus {
  top: 12px;
  outline: 2px solid var(--color-text-inverse);
  outline-offset: 2px;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Focus visible */
:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

button:focus:not(:focus-visible),
a:focus:not(:focus-visible) {
  outline: none;
}

/* Toast */
#toastRoot {
  position: fixed;
  bottom: 28px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 700;
  pointer-events: none;
}

.app-toast {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 12px 20px;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-inverse);
  background: var(--color-accent);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  opacity: 0;
  transform: translateY(8px);
  transition: opacity var(--duration-normal) var(--ease-out), transform var(--duration-normal) var(--ease-out);
}

.app-toast.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.app-toast--error {
  background: #8b4513;
}

.app-toast--info {
  background: #4e5c6b;
}

.app-toast--warning {
  background: #8b6914;
}

/* Loading */
.ui-spinner {
  display: inline-block;
  width: 14px;
  height: 14px;
  border: 2px solid var(--color-border);
  border-top-color: var(--color-accent);
  border-radius: 50%;
  animation: uiSpin 0.7s linear infinite;
}

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

.ui-skeleton {
  background: linear-gradient(
    90deg,
    var(--color-bg-subtle) 25%,
    var(--color-bg-hover) 50%,
    var(--color-bg-subtle) 75%
  );
  background-size: 200% 100%;
  animation: uiShimmer 1.2s ease-in-out infinite;
  border-radius: var(--radius-sm);
}

.ui-skeleton--row {
  height: 48px;
  margin-bottom: 8px;
}

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

.main-content--loading {
  position: relative;
  pointer-events: none;
}

.page-loading {
  position: absolute;
  inset: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: center;
  background: color-mix(in srgb, var(--color-bg) 70%, transparent);
  animation: fadeIn var(--duration-fast) var(--ease-out);
}

.page-loading__spinner {
  width: 32px;
  height: 32px;
  border: 3px solid var(--color-border);
  border-top-color: var(--color-accent);
  border-radius: 50%;
  animation: uiSpin 0.8s linear infinite;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

/* Empty states */
.ui-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 48px 24px;
  animation: fadeInUp var(--duration-slow) var(--ease-out) both;
}

.ui-empty__icon {
  color: var(--color-text-tertiary);
  margin-bottom: 16px;
  opacity: 0.7;
}

.ui-empty__title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  margin-bottom: 8px;
}

.ui-empty__message {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  max-width: 360px;
  line-height: var(--line-height-relaxed);
  margin-bottom: 8px;
}

.ui-empty__hint {
  font-size: var(--font-size-xs);
  color: var(--color-text-tertiary);
  margin-bottom: 16px;
}

.ui-empty__action {
  margin-top: 8px;
}

/* Context menu */
.context-menu {
  position: fixed;
  z-index: 600;
  min-width: 180px;
  padding: 6px;
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  opacity: 0;
  transform: scale(0.96);
  transition: opacity var(--duration-fast) var(--ease-out), transform var(--duration-fast) var(--ease-out);
}

.context-menu.is-visible {
  opacity: 1;
  transform: scale(1);
}

.context-menu__item {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  padding: 8px 12px;
  font-size: var(--font-size-sm);
  color: var(--color-text-primary);
  background: transparent;
  border: none;
  border-radius: var(--radius-sm);
  text-align: left;
  cursor: pointer;
  transition: background-color var(--duration-fast) var(--ease-out);
}

.context-menu__item:hover:not(:disabled),
.context-menu__item:focus-visible {
  background: var(--color-bg-hover);
}

.context-menu__item--danger {
  color: #a0522d;
}

.context-menu__item:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.context-menu__icon {
  width: 18px;
  text-align: center;
  flex-shrink: 0;
}

/* Shortcuts modal */
.shortcuts-overlay {
  opacity: 1;
}

.shortcuts-modal {
  max-width: 420px;
}

.shortcuts-list {
  padding: 0 24px 24px;
}

.shortcuts-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 10px 0;
  border-bottom: 1px solid var(--color-border);
}

.shortcuts-row:last-child {
  border-bottom: none;
}

.shortcuts-row__keys {
  font-family: inherit;
  font-size: var(--font-size-xs);
  padding: 4px 8px;
  background: var(--color-bg-subtle);
  border: 1px solid var(--color-border);
  border-radius: 5px;
  white-space: nowrap;
}

.shortcuts-row__label {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

/* Command palette additions */
.command-group__title {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px 6px;
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--color-text-tertiary);
}

.command-result {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 10px 16px;
  text-align: left;
  background: transparent;
  border: none;
  cursor: pointer;
  transition: background-color var(--duration-fast) var(--ease-out);
}

.command-result:hover,
.command-result.is-active {
  background: var(--color-bg-hover);
}

.command-result__label {
  font-size: var(--font-size-sm);
  color: var(--color-text-primary);
}

.command-result__group {
  font-size: var(--font-size-xs);
  color: var(--color-text-tertiary);
}

.global-search__loading {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 32px;
  font-size: var(--font-size-sm);
  color: var(--color-text-tertiary);
}

.search-result.is-active {
  background: var(--color-accent-soft);
}

.favorite-star {
  color: var(--color-text-tertiary);
  transition: color var(--duration-fast) var(--ease-out);
}

.favorite-star.is-active {
  color: #c4a035;
}

@media (min-width: 768px) {
  #toastRoot {
    bottom: 32px;
  }
}

@media (max-width: 768px) {
  .app-toast {
    max-width: calc(100vw - 32px);
  }
}