/* Opt-in M1 components. The base button is the secondary treatment. */
.ui-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--ui-space-2);
  min-height: var(--ui-control-height);
  padding: 8px var(--ui-control-padding-inline);
  border: var(--ui-border-width) solid var(--ui-control-border);
  border-radius: var(--ui-control-radius);
  background: var(--ui-color-surface);
  color: var(--ui-color-text);
  font: inherit;
  font-size: 0.8125rem;
  font-weight: 550;
  line-height: 1.5;
  text-align: center;
  text-decoration: none;
  white-space: nowrap;
  cursor: pointer;
  transition: background-color 0.15s, border-color 0.15s, color 0.15s;
}

.ui-button:hover:not(:disabled) {
  border-color: var(--ui-control-border-hover);
  background: var(--ui-color-surface-hover);
}

.ui-button:active:not(:disabled) {
  background: var(--ui-color-surface-active);
}

.ui-button--primary {
  border-color: transparent;
  background: var(--ui-color-brand);
  color: var(--ui-color-on-brand);
}

.ui-button--primary:hover:not(:disabled) {
  border-color: transparent;
  background: var(--ui-color-brand-hover);
}

.ui-button--primary:active:not(:disabled) {
  background: var(--ui-color-brand-active);
}

.ui-button--ghost {
  border-color: transparent;
  background: transparent;
  color: var(--ui-color-text-muted);
}

.ui-button--ghost:hover:not(:disabled) {
  border-color: transparent;
}

.ui-button--small {
  min-height: 32px;
  padding: 6px 10px;
  font-size: 0.75rem;
}

.ui-button:focus-visible {
  outline: var(--ui-focus-width) solid var(--ui-color-focus);
  outline-offset: var(--ui-focus-offset);
}

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

.ui-field {
  display: grid;
  gap: var(--ui-space-2);
}

.ui-field__label {
  color: var(--ui-color-text);
  font-size: 0.875rem;
  font-weight: 550;
}

.ui-input {
  display: block;
  width: 100%;
  min-width: 0;
  min-height: var(--ui-control-height);
  padding: 9px 11px;
  border: var(--ui-border-width) solid var(--ui-control-border);
  border-radius: var(--ui-control-radius);
  background: var(--ui-color-surface);
  color: var(--ui-color-text);
  font: inherit;
  font-size: 0.875rem;
  line-height: 1.5;
  transition: border-color 0.15s, background-color 0.15s;
}

.ui-input::placeholder {
  color: var(--ui-color-text-muted);
  opacity: 1;
}

.ui-input:hover:not(:disabled, [aria-invalid="true"], :focus) {
  border-color: var(--ui-control-border-hover);
}

.ui-input:focus {
  border-color: var(--ui-color-focus);
}

.ui-input:focus-visible {
  outline: var(--ui-focus-width) solid var(--ui-color-focus);
  outline-offset: var(--ui-focus-offset);
}

.ui-input:disabled {
  background: var(--ui-color-surface-subtle);
  color: var(--ui-color-text-muted);
  opacity: 0.65;
  cursor: not-allowed;
}

/* Set aria-invalid="true" and link a visible error message with aria-describedby. */
.ui-input[aria-invalid="true"] {
  border-color: var(--ui-color-danger);
}

.ui-input[aria-invalid="true"]:focus-visible {
  outline-color: var(--ui-color-danger);
}

.ui-field__hint {
  color: var(--ui-color-text-muted);
  font-size: 0.78rem;
}

.ui-field__error {
  color: var(--ui-color-danger);
  font-size: 0.78rem;
}

.ui-empty {
  display: grid;
  justify-items: center;
  gap: var(--ui-space-2);
  padding: var(--ui-space-6) var(--ui-space-4);
  border: var(--ui-border-width) solid var(--ui-color-border);
  border-radius: var(--ui-radius-surface);
  background: var(--ui-color-surface);
  text-align: center;
}

.ui-empty__title {
  margin: 0;
  color: var(--ui-color-text);
  font-size: 0.95rem;
  font-weight: 600;
}

.ui-empty__description {
  max-width: 48ch;
  margin: 0;
  color: var(--ui-color-text-muted);
  font-size: 0.8125rem;
}

.ui-empty__action {
  margin-top: var(--ui-space-2);
}

@media (prefers-reduced-motion: reduce) {
  .ui-button,
  .ui-input {
    transition: none;
  }
}