/**
 * Familytree 2.0 - Buttons Component
 * Neutral button styles based on globe page
 */

/* ============================================
   Base Button
   ============================================ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-xl);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  font-family: inherit;
  line-height: 1;
  text-decoration: none;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--duration-normal) var(--ease-smooth);
  white-space: nowrap;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
}

.btn:focus {
  outline: 2px solid var(--color-border-focus);
  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) 0%, var(--color-primary-dark) 100%);
  color: white;
  box-shadow: 0 4px 12px rgba(102, 126, 234, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(102, 126, 234, 0.4);
}

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

/* Secondary Button */
.btn-secondary {
  background: var(--color-surface);
  color: var(--color-text-primary);
  border: 1px solid var(--color-border);
}

.btn-secondary:hover {
  background: var(--color-interactive-hover);
  border-color: var(--color-primary);
}

/* Ghost Button */
.btn-ghost {
  background: transparent;
  color: var(--color-text-primary);
  border: 1px solid transparent;
}

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

/* Danger Button */
.btn-danger {
  background: #ef4444;
  color: white;
  box-shadow: 0 4px 12px rgba(239, 68, 68, 0.3);
}

.btn-danger:hover {
  background: #dc2626;
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(239, 68, 68, 0.4);
}

/* Success Button */
.btn-success {
  background: #10b981;
  color: white;
  box-shadow: 0 4px 12px rgba(16, 185, 129, 0.3);
}

.btn-success:hover {
  background: #059669;
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(16, 185, 129, 0.4);
}

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

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

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

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

/* ============================================
   Button Block (Full Width)
   ============================================ */

.btn-block {
  display: flex;
  width: 100%;
}

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

.btn-icon {
  padding: var(--space-md);
  width: 40px;
  height: 40px;
}

.btn-icon.btn-sm {
  padding: var(--space-sm);
  width: 32px;
  height: 32px;
}

.btn-icon.btn-lg {
  padding: var(--space-lg);
  width: 48px;
  height: 48px;
}

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

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

.btn-group-vertical {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

/* Connected buttons */
.btn-group-connected {
  display: inline-flex;
  gap: 0;
}

.btn-group-connected .btn {
  border-radius: 0;
  border-right-width: 0;
}

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

.btn-group-connected .btn:last-child {
  border-top-right-radius: var(--radius-md);
  border-bottom-right-radius: var(--radius-md);
  border-right-width: 1px;
}

/* ============================================
   Loading State
   ============================================ */

.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 currentColor;
  border-top-color: transparent;
  border-radius: 50%;
  animation: button-spin 0.6s linear infinite;
}

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

/* ============================================
   Mobile Optimizations
   ============================================ */

@media (max-width: 767px) {
  .btn {
    /* Larger touch targets on mobile */
    min-height: 44px;
    padding: var(--space-sm) var(--space-lg);
  }

  .btn-block-mobile {
    display: flex;
    width: 100%;
  }

  .btn-group {
    flex-wrap: wrap;
  }
}

/* ============================================
   Floating Action Button (FAB)
   ============================================ */

.btn-fab {
  position: fixed;
  bottom: var(--space-2xl);
  right: var(--space-2xl);
  width: 56px;
  height: 56px;
  padding: 0;
  border-radius: 50%;
  box-shadow: var(--shadow-xl);
  z-index: var(--z-fab);
}

.btn-fab:hover {
  transform: scale(1.1);
}

@media (max-width: 767px) {
  .btn-fab {
    bottom: calc(var(--space-2xl) + 60px); /* Above mobile nav */
  }
}