/* ==========================================================================
   button.css — Componente Botão (DESIGN.md, Seção 7.1)
   Variantes: contained (primária), outlined (secundária), text (terciária).
   ========================================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  min-height: 40px;
  padding: var(--space-2) var(--space-4);
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  line-height: 1;
  cursor: pointer;
  transition: background-color var(--transition-base), border-color var(--transition-base),
    color var(--transition-base), box-shadow var(--transition-base);
}
.btn:disabled {
  cursor: not-allowed;
  color: var(--color-action-disabled-text);
  background-color: var(--color-action-disabled-bg);
  border-color: transparent;
}

/* Contained (ação primária) */
.btn--contained {
  background-color: var(--color-primary-main);
  color: var(--color-primary-contrast);
}
.btn--contained:hover:not(:disabled) { background-color: var(--color-primary-dark); }

/* Outlined (ação secundária) */
.btn--outlined {
  background-color: transparent;
  color: var(--color-text-primary);
  border-color: var(--color-divider);
}
.btn--outlined:hover:not(:disabled) {
  background-color: var(--color-action-hover);
  border-color: var(--color-text-secondary);
}

/* Text (ação terciária) */
.btn--text {
  background-color: transparent;
  color: var(--color-text-primary);
}
.btn--text:hover:not(:disabled) { background-color: var(--color-action-hover); }

/* Tamanhos */
.btn--sm { min-height: 32px; padding: var(--space-1) var(--space-3); }
.btn--lg { min-height: 48px; padding: var(--space-3) var(--space-6); font-size: var(--font-size-md); }