/* ========================================
   BUTTON COMPONENTS
   ======================================== */

/* Base button */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-2);
  padding: var(--spacing-2) var(--spacing-4);
  font-family: var(--font-family-primary);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  line-height: var(--line-height-tight);
  text-align: center;
  text-decoration: none;
  border: var(--border-width-thin) solid transparent;
  border-radius: var(--border-radius-md);
  cursor: pointer;
  transition: all var(--transition-duration-fast) var(--transition-timing-out);
  white-space: nowrap;
  user-select: none;
}

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

.btn:disabled,
.btn.disabled {
  opacity: 0.6;
  cursor: not-allowed;
  pointer-events: none;
}

/* Button sizes */
.btn-sm {
  padding: var(--spacing-1) var(--spacing-2);
  font-size: var(--font-size-sm);
  border-radius: var(--border-radius-sm);
}

.btn-lg {
  padding: var(--spacing-3) var(--spacing-6);
  font-size: var(--font-size-lg);
  border-radius: var(--border-radius-lg);
}

.btn-xl {
  padding: var(--spacing-4) var(--spacing-8);
  font-size: var(--font-size-xl);
  border-radius: var(--border-radius-xl);
}

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

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

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

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

.btn-secondary:hover:not(:disabled):not(.disabled) {
  background-color: var(--color-secondary-dark);
  border-color: var(--color-secondary-dark);
  color: white;
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

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

.btn-accent:hover:not(:disabled):not(.disabled) {
  background-color: var(--color-accent-dark);
  border-color: var(--color-accent-dark);
  color: white;
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

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

.btn-outline-primary:hover:not(:disabled):not(.disabled) {
  background-color: var(--color-primary);
  color: white;
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

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

.btn-outline-secondary:hover:not(:disabled):not(.disabled) {
  background-color: var(--color-secondary);
  color: white;
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

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

.btn-ghost:hover:not(:disabled):not(.disabled) {
  background-color: var(--color-background-tertiary);
  color: var(--color-primary);
  text-decoration: none;
}

.btn-ghost-primary {
  background-color: transparent;
  color: var(--color-primary);
  border-color: transparent;
}

.btn-ghost-primary:hover:not(:disabled):not(.disabled) {
  background-color: var(--color-primary-50);
  color: var(--color-primary-dark);
  text-decoration: none;
}

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

.btn-icon svg {
  width: 1.2em;
  height: 1.2em;
  fill: currentColor;
  transition: transform var(--transition-duration-fast) var(--transition-timing-out);
}

.btn-icon:hover svg {
  transform: translateX(2px);
}

/* Icon only button */
.btn-icon-only {
  padding: var(--spacing-2);
  border-radius: var(--border-radius-full);
}

.btn-icon-only svg {
  width: 1.2em;
  height: 1.2em;
}

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

/* Button group */
.btn-group {
  display: inline-flex;
  gap: var(--spacing-1);
}

.btn-group-vertical {
  display: inline-flex;
  flex-direction: column;
  gap: var(--spacing-1);
}

/* Loading state */
.btn-loading {
  position: relative;
  color: transparent !important;
}

.btn-loading::after {
  content: '';
  position: absolute;
  width: 1em;
  height: 1em;
  border: 2px solid currentColor;
  border-radius: var(--border-radius-full);
  border-right-color: transparent;
  animation: spin 0.6s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* Responsive buttons */
@media (max-width: 640px) {
  .btn-responsive {
    width: 100%;
    justify-content: center;
  }
}