/* Button Component Styles */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-4);
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  font-family: inherit;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  line-height: 1;
  text-decoration: none;
  text-align: center;
  white-space: nowrap;
  cursor: pointer;
  user-select: none;
  transition: var(--transition-all);
  position: relative;
  overflow: hidden;
  min-height: var(--button-height);
  
  /* Prevent text selection */
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
}

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

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}

/* Button Variants */

/* Primary Button */
.btn-primary {
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  color: white;
  border-color: var(--color-primary);
  box-shadow: var(--shadow-sm);
}

.btn-primary:hover:not(:disabled) {
  background: linear-gradient(135deg, var(--color-primary-dark), var(--color-accent-dark));
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

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

/* Secondary Button */
.btn-secondary {
  background-color: var(--color-surface);
  color: var(--color-text-primary);
  border-color: var(--color-border);
}

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

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

/* Ghost Button */
.btn-ghost {
  background-color: transparent;
  color: var(--color-text-secondary);
  border-color: transparent;
}

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

.btn-ghost:active:not(:disabled) {
  background-color: var(--color-surface-active);
}

/* Outline Button */
.btn-outline {
  background-color: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary);
}

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

.btn-outline:active:not(:disabled) {
  background-color: var(--color-primary-dark);
}

/* Danger Button */
.btn-danger {
  background-color: var(--color-error);
  color: white;
  border-color: var(--color-error);
}

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

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

/* Success Button */
.btn-success {
  background-color: var(--color-success);
  color: white;
  border-color: var(--color-success);
}

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

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

/* Warning Button */
.btn-warning {
  background-color: var(--color-warning);
  color: white;
  border-color: var(--color-warning);
}

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

.btn-warning:active:not(:disabled) {
  background-color: var(--color-warning-dark);
}

/* Button Sizes */

.btn-sm {
  padding: var(--space-2) var(--space-3);
  font-size: var(--font-size-xs);
  min-height: var(--button-height-sm);
}

.btn-lg {
  padding: var(--space-4) var(--space-6);
  font-size: var(--font-size-base);
  min-height: var(--button-height-lg);
}

.btn-large {
  padding: var(--space-5) var(--space-8);
  font-size: var(--font-size-lg);
  min-height: 3.5rem;
  font-weight: var(--font-weight-semibold);
}

/* Button States */

.btn-loading {
  color: transparent;
  pointer-events: none;
}

.btn-loading::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 16px;
  height: 16px;
  border: 2px solid currentColor;
  border-radius: 50%;
  border-top-color: transparent;
  animation: btn-spin 0.8s linear infinite;
}

.btn-loading.btn-sm::after {
  width: 12px;
  height: 12px;
}

.btn-loading.btn-lg::after,
.btn-loading.btn-large::after {
  width: 20px;
  height: 20px;
}

@keyframes btn-spin {
  to {
    transform: translate(-50%, -50%) rotate(360deg);
  }
}

/* Icon Buttons */
.btn-icon {
  padding: var(--space-2);
  min-width: var(--button-height);
  aspect-ratio: 1;
}

.btn-icon.btn-sm {
  min-width: var(--button-height-sm);
}

.btn-icon.btn-lg {
  min-width: var(--button-height-lg);
}

.btn-icon .icon {
  width: 18px;
  height: 18px;
}

.btn-icon.btn-sm .icon {
  width: 14px;
  height: 14px;
}

.btn-icon.btn-lg .icon {
  width: 22px;
  height: 22px;
}

/* Button Groups */
.btn-group {
  display: inline-flex;
  vertical-align: middle;
}

.btn-group .btn {
  border-radius: 0;
  margin-left: -1px;
}

.btn-group .btn:first-child {
  border-top-left-radius: var(--radius-md);
  border-bottom-left-radius: var(--radius-md);
  margin-left: 0;
}

.btn-group .btn:last-child {
  border-top-right-radius: var(--radius-md);
  border-bottom-right-radius: var(--radius-md);
}

.btn-group .btn:hover {
  z-index: 1;
}

/* Full Width Button */
.btn-block {
  display: flex;
  width: 100%;
}

/* Floating Action Button */
.btn-fab {
  position: fixed;
  bottom: var(--space-6);
  right: var(--space-6);
  width: 56px;
  height: 56px;
  border-radius: 50%;
  box-shadow: var(--shadow-dark-lg);
  z-index: var(--z-fixed);
  padding: 0;
}

.btn-fab:hover {
  box-shadow: var(--shadow-dark-xl);
  transform: scale(1.05);
}

/* Button with Badge */
.btn-badge {
  position: relative;
}

.btn-badge::after {
  content: attr(data-badge);
  position: absolute;
  top: -6px;
  right: -6px;
  min-width: 18px;
  height: 18px;
  padding: 0 4px;
  background-color: var(--color-error);
  color: white;
  font-size: 10px;
  font-weight: var(--font-weight-bold);
  line-height: 18px;
  text-align: center;
  border-radius: 9px;
  border: 2px solid var(--color-bg-primary);
}

/* Responsive Design */
@media (max-width: 768px) {
  .btn-large {
    padding: var(--space-4) var(--space-6);
    font-size: var(--font-size-base);
    min-height: 3rem;
  }
  
  .btn-fab {
    bottom: var(--space-4);
    right: var(--space-4);
    width: 48px;
    height: 48px;
  }
}

@media (max-width: 480px) {
  .btn-group {
    flex-direction: column;
  }
  
  .btn-group .btn {
    border-radius: var(--radius-md);
    margin-left: 0;
    margin-top: -1px;
  }
  
  .btn-group .btn:first-child {
    margin-top: 0;
  }
}

/* High Contrast Mode */
@media (prefers-contrast: high) {
  .btn {
    border-width: 2px;
  }
  
  .btn-ghost {
    border-color: var(--color-border);
  }
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
  .btn {
    transition: none;
  }
  
  .btn:hover {
    transform: none;
  }
  
  .btn-loading::after {
    animation: none;
  }
}