/* Base Button Styles */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  font-family: var(--font-family-body);
  font-size: 15px;
  font-weight: 600;
  line-height: 22px;
  padding: 12px 24px;
  border-radius: var(--radius-md); /* 12px / 0.75rem de acordo com design.md */
  border: none;
  cursor: pointer;
  outline: none;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  user-select: none;
  width: auto;
}

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

.btn:active:not(:disabled) {
  transform: scale(0.96);
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

/* Button Variants */
.btn--primary {
  background-color: var(--color-primary-container);
  color: var(--color-on-primary);
  box-shadow: var(--shadow-action);
}

.btn--primary:hover:not(:disabled) {
  background-color: var(--color-primary);
}

.btn--secondary {
  background-color: var(--color-surface-container-lowest);
  color: var(--color-on-background);
  border: 1px solid var(--color-outline-variant);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
}

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

.btn--danger {
  background-color: var(--color-error);
  color: var(--color-on-primary);
  box-shadow: 0 4px 12px rgba(255, 59, 48, 0.2);
}

.btn--danger:hover:not(:disabled) {
  background-color: #d32f2f;
}

.btn--ghost {
  background-color: transparent;
  color: var(--color-primary);
  padding-left: var(--spacing-sm);
  padding-right: var(--spacing-sm);
}

.btn--ghost:hover:not(:disabled) {
  background-color: rgba(171, 53, 0, 0.05);
}

/* Icons */
.btn__icon {
  font-size: 20px !important;
}

/* Loading Spinner Styles */
.btn__spinner {
  width: 18px;
  height: 18px;
  animation: rotate-spinner 0.8s linear infinite;
}

.btn__spinner-track {
  stroke: rgba(255, 255, 255, 0.2);
}

.btn--secondary .btn__spinner-track {
  stroke: rgba(0, 0, 0, 0.1);
}

.btn__spinner-head {
  stroke: currentColor;
  transform-origin: center;
}

@keyframes rotate-spinner {
  100% {
    transform: rotate(360deg);
  }
}

/* Floating Action Button (FAB) */
.fab {
  position: fixed;
  bottom: calc(72px + 16px); /* 72px (BottomNav) + 16px */
  right: var(--spacing-gutter);
  background-color: var(--color-primary-container);
  color: var(--color-on-primary);
  border: none;
  border-radius: var(--radius-full);
  padding: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  box-shadow: 0 4px 16px rgba(255, 107, 53, 0.35);
  cursor: pointer;
  z-index: 40;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.fab:active {
  transform: scale(0.92);
}

.fab__icon {
  font-size: 24px !important;
}

.fab__label {
  font-family: var(--font-family-body);
  font-size: 13px;
  font-weight: 600;
  padding-right: 4px;
}