.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 32px;
  font-size: 1rem;
  font-weight: 600;
  font-family: inherit;
  border-radius: var(--border-radius-full);
  border: 2px solid transparent;
  cursor: pointer;
  transition: all var(--transition-base);
  text-align: center;
  white-space: nowrap;
}

.btn-primary {
  background: var(--accent);
  color: var(--white);
  border-color: transparent;
  position: relative;
  overflow: hidden;
  animation: btnPulse 3s ease-in-out infinite;
}

@keyframes btnPulse {
  0%, 100% { transform: translateY(0);    box-shadow: 0 4px 14px rgba(0,0,0,0.18); }
  50%       { transform: translateY(-2px); box-shadow: 0 8px 22px rgba(0,0,0,0.26); }
}

/* Brilho flutuante — faixa de luz que varre o botão no hover */
.btn-primary::before {
  content: '';
  position: absolute;
  top: 0;
  left: -110%;
  width: 55%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.38), transparent);
  transform: skewX(-22deg);
  transition: left 0.65s ease;
  pointer-events: none;
}

.btn-primary:hover::before { left: 160%; }

.btn-primary:hover {
  background: var(--accent-light);
  border-color: transparent;
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.25);
  animation-play-state: paused;
}

.btn-secondary {
  background: transparent;
  color: var(--white);
  border-color: rgba(255, 255, 255, 0.5);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--white);
  transform: translateY(-2px);
}

.btn-outline {
  background: transparent;
  color: var(--accent);
  border-color: var(--accent);
}

.btn-outline:hover {
  background: var(--accent);
  color: var(--white);
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(74, 144, 217, 0.3);
}

.btn-whatsapp {
  background: #25D366;
  color: var(--white);
  border-color: #25D366;
}

.btn-whatsapp:hover {
  background: #128C7E;
  border-color: #128C7E;
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(37, 211, 102, 0.4);
}

.btn-lg {
  padding: 18px 40px;
  font-size: 1.125rem;
}

.btn-sm {
  padding: 10px 20px;
  font-size: 0.875rem;
}

.btn-icon {
  width: 48px;
  height: 48px;
  padding: 0;
  border-radius: 50%;
}

.btn-icon i {
  font-size: 1.25rem;
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none !important;
}

.btn-group {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

@media (max-width: 480px) {
  .btn {
    padding: 12px 24px;
    font-size: 0.9375rem;
  }
  
  .btn-lg {
    padding: 14px 28px;
    font-size: 1rem;
  }
  
  .btn-group {
    flex-direction: column;
  }
  
  .btn-group .btn {
    width: 100%;
  }
}