/* ==============================================
   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);
  color: var(--color-white);
  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);
  color: var(--color-white);
}

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

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

/* 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;
}

/* Ripple effect */
@keyframes ripple {
  to { transform: scale(4); opacity: 0; }
}

.btn-ripple {
  position: absolute;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.35);
  transform: scale(0);
  animation: ripple 0.6s linear;
  pointer-events: none;
}

.btn-secondary .btn-ripple,
.btn-ghost .btn-ripple {
  background: rgba(0, 0, 0, 0.08);
}

/* Enhanced hover */
.btn-primary:hover:not(:disabled),
.btn-danger:hover:not(:disabled),
.btn-success:hover:not(:disabled) {
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.btn-secondary:hover:not(:disabled) {
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

/* Active press */
.btn:active:not(:disabled) {
  transform: scale(0.97);
}

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

/* ==============================================
   Enhanced Buttons — Professional Polish
   ============================================== */

/* Primary: gradient on hover */
.btn-primary:hover:not(:disabled) {
  background: var(--gradient-primary-hover);
  box-shadow: var(--shadow-primary);
}

/* Better disabled state */
.btn:disabled {
  opacity: 0.5;
  filter: grayscale(20%);
  box-shadow: none;
}

/* Icon-only button variant */
.btn-icon-only {
  padding: var(--spacing-2);
  min-width: 40px;
  min-height: 40px;
}

.btn-icon-only svg {
  width: 20px;
  height: 20px;
}

/* Button group */
.btn-group {
  display: inline-flex;
  gap: 0;
}

.btn-group .btn {
  border-radius: 0;
}

.btn-group .btn:first-child {
  border-radius: var(--radius-lg) 0 0 var(--radius-lg);
}

.btn-group .btn:last-child {
  border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
}

.btn-group .btn + .btn {
  margin-left: -1px;
}

/* Outline variants */
.btn-outline-primary {
  background: transparent;
  color: var(--color-primary);
  border: 1.5px solid var(--color-primary);
}

.btn-outline-primary:hover:not(:disabled) {
  background: rgba(var(--color-primary-rgb), 0.06);
  color: var(--color-primary-dark);
}