/* ==============================================
   Buttons
   ============================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-2);
  font-weight: 600;
  border: none;
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition-fast);
  position: relative;
  overflow: hidden;
  padding: var(--spacing-3) var(--spacing-6);
  font-size: var(--font-size-base);
  text-decoration: none;
}

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

/* Sizes */
.btn-sm {
  padding: var(--spacing-2) var(--spacing-4);
  font-size: var(--font-size-sm);
  border-radius: var(--radius-lg);
}

.btn-md {
  padding: var(--spacing-3) var(--spacing-6);
  font-size: var(--font-size-base);
}

.btn-lg {
  padding: var(--spacing-4) var(--spacing-8);
  font-size: var(--font-size-lg);
  min-height: 56px;
}

/* Variants */
.btn-primary {
  background: var(--color-primary);
  color: var(--color-white);
}

.btn-primary:hover:not(:disabled) {
  background: var(--color-primary-dark);
  transform: translateY(-1px);
}

.btn-primary:active:not(:disabled) {
  transform: translateY(0);
}

.btn-secondary {
  background: var(--color-white);
  color: var(--color-gray-700);
  border: 1px solid var(--color-gray-300);
}

.btn-secondary:hover:not(:disabled) {
  background: var(--color-gray-50);
  border-color: var(--color-gray-400);
}

.btn-ghost {
  background: transparent;
  color: var(--color-gray-600);
}

.btn-ghost:hover:not(:disabled) {
  background: var(--color-gray-100);
  color: var(--color-gray-900);
}

.btn-text {
  background: transparent;
  color: var(--color-primary);
  padding: var(--spacing-2);
}

.btn-text:hover:not(:disabled) {
  text-decoration: underline;
}

.btn-danger {
  background: var(--color-error);
  color: var(--color-white);
}

.btn-danger:hover:not(:disabled) {
  background: var(--color-error-dark);
}

.btn-success {
  background: var(--color-success);
  color: var(--color-white);
}

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

/* Full width */
.btn-full {
  width: 100%;
}

/* Button content */
.btn-content {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-2);
}

.btn-content-hidden {
  visibility: hidden;
}

.btn-icon {
  display: flex;
  align-items: center;
}

.btn-arrow {
  display: flex;
  align-items: center;
  margin-left: var(--spacing-2);
}

/* Loading state */
.btn-loading {
  pointer-events: none;
}

.btn-spinner {
  position: absolute;
  width: 24px;
  height: 24px;
  border: 3px solid currentColor;
  border-right-color: transparent;
  border-radius: 50%;
  animation: spin 0.75s linear infinite;
}

.btn:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}