/**
 * Phase 16-0 — primary button surface (tokens only; RTL-safe).
 */
.rastan-btn {
  box-sizing: border-box;
  display: inline-flex;
  flex-direction: row;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  margin: 0;
  padding-block: var(--spacing-sm);
  padding-inline: var(--spacing-md);
  font-family: var(--font-family-sans);
  font-size: var(--font-scale-base);
  font-weight: 600;
  line-height: 1.25;
  border-width: 1px;
  border-style: solid;
  border-radius: var(--radius-md);
  cursor: pointer;
  text-align: center;
  transition:
    background-color 0.15s ease,
    color 0.15s ease,
    border-color 0.15s ease,
    opacity 0.15s ease,
    box-shadow 0.15s ease;
}

.rastan-btn:focus-visible {
  outline: none;
  box-shadow: 0 0 0 2px var(--color-primary);
}

.rastan-btn--primary {
  color: var(--color-background);
  background-color: var(--color-primary);
  border-color: transparent;
}

.rastan-btn--primary:hover:not(:disabled) {
  filter: brightness(1.08);
}

.rastan-btn--primary:active:not(:disabled) {
  filter: brightness(0.92);
}

.rastan-btn--secondary {
  color: var(--color-text);
  background-color: var(--color-surface);
  border-color: var(--color-muted);
}

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

.rastan-btn--secondary:active:not(:disabled) {
  opacity: 0.9;
}

.rastan-btn--ghost {
  color: var(--color-primary);
  background-color: transparent;
  border-color: transparent;
}

.rastan-btn--ghost:hover:not(:disabled) {
  background-color: var(--color-surface);
}

.rastan-btn--ghost:active:not(:disabled) {
  opacity: 0.85;
}

.rastan-btn--danger {
  color: var(--color-background);
  background-color: var(--color-danger);
  border-color: transparent;
}

.rastan-btn--danger:hover:not(:disabled) {
  filter: brightness(1.06);
}

.rastan-btn--danger:active:not(:disabled) {
  filter: brightness(0.9);
}

.rastan-btn:disabled,
.rastan-btn.rastan-btn--loading {
  cursor: not-allowed;
  opacity: 0.55;
  pointer-events: none;
}

.rastan-btn__spinner {
  box-sizing: border-box;
  width: 1em;
  height: 1em;
  flex-shrink: 0;
  border-radius: 50%;
  border: 2px solid var(--color-muted);
  border-inline-start-color: var(--color-primary);
  animation: rastan-btn-spin 0.7s linear infinite;
}

@keyframes rastan-btn-spin {
  to {
    transform: rotate(360deg);
  }
}