/* ============================================
   Button Component
   ============================================ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md) var(--spacing-xl);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  text-decoration: none;
  border: none;
  border-radius: var(--border-radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
  user-select: none;
}

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

/* ===== Button Variants ===== */

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

.btn--primary:hover {
  background-color: var(--color-primary-dark);
  color: white;
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn--primary:active {
  transform: translateY(0);
}

/* Secondary Button */
.btn--secondary {
  background-color: var(--color-secondary);
  color: white;
}

.btn--secondary:hover {
  background-color: var(--color-secondary-dark);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn--secondary:active {
  transform: translateY(0);
}

/* Outline Button */
.btn--outline {
  background-color: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}

.btn--outline:hover {
  background-color: var(--color-primary);
  color: white;
  transform: translateY(-1px);
}

.btn--outline:active {
  transform: translateY(0);
}

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

.btn--ghost:hover {
  background-color: var(--color-surface);
}

/* Accent Button */
.btn--accent {
  background-color: var(--color-accent);
  color: white;
}

.btn--accent:hover {
  background-color: var(--color-accent-dark);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn--accent:active {
  transform: translateY(0);
}

/* ===== Button Sizes ===== */

.btn--sm {
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: var(--font-size-sm);
}

.btn--lg {
  padding: var(--spacing-lg) var(--spacing-2xl);
  font-size: var(--font-size-lg);
}

/* ===== Button States ===== */

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

.btn--loading::after {
  content: '';
  position: absolute;
  width: 16px;
  height: 16px;
  top: 50%;
  left: 50%;
  margin-left: -8px;
  margin-top: -8px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-top-color: white;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

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

/* ===== Button Icon ===== */

.btn__icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}

.btn__icon--left {
  margin-right: var(--spacing-xs);
}

.btn__icon--right {
  margin-left: var(--spacing-xs);
}

/* ===== Button Group ===== */

.btn-group {
  display: inline-flex;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
}

/* ===== Full Width Button ===== */

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