/* ============================================
   KUMANI — COMPONENTE: BOTÃO
   Sistema com 3 variantes (primary, secondary, ghost) e 2 tamanhos.
   ============================================ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  font-family: var(--font-primary);
  font-weight: var(--fw-bold);
  font-size: var(--fs-sm);
  border-radius: var(--radius-button);
  padding: var(--space-4) var(--space-6);
  border: 1px solid transparent;
  transition: transform var(--duration-fast) var(--ease-standard),
              box-shadow var(--duration-fast) var(--ease-standard),
              background-color var(--duration-fast) var(--ease-standard),
              color var(--duration-fast) var(--ease-standard);
}

.btn:active {
  transform: scale(0.98);
}

.btn:disabled,
.btn[aria-disabled="true"] {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}

/* --- Variante: primary (verde sólido) --- */
.btn--primary {
  background: var(--color-brand-primary);
  color: var(--color-text-on-brand);
}

.btn--primary:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-brand);
}

/* --- Variante: secondary (contorno, sobre fundo claro) --- */
.btn--secondary {
  background: transparent;
  color: var(--color-text-primary);
  border-color: var(--color-border-strong);
}

.btn--secondary:hover {
  border-color: var(--color-text-primary);
}

/* --- Variante: ghost (contorno branco, para usar sobre imagem/vídeo escuro) --- */
.btn--ghost {
  background: transparent;
  color: var(--color-neutral-0);
  border-color: rgba(255, 255, 255, 0.5);
}

.btn--ghost:hover {
  border-color: var(--color-neutral-0);
  background: rgba(255, 255, 255, 0.08);
}

/* --- Tamanhos --- */
.btn--sm {
  padding: var(--space-3) var(--space-5);
  font-size: var(--fs-xs);
}

.btn--full {
  width: 100%;
}

/* --- Botão só com ícone (ex.: setas de navegação, fechar modal) --- */
.btn-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  color: var(--color-text-primary);
  transition: background-color var(--duration-fast) var(--ease-standard);
}

.btn-icon:hover {
  background: var(--color-bg-subtle);
}

.btn-icon:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}