/* ==========================================================================
   Buttons - Apple-style interactive elements
   ========================================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-5);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  line-height: 1;
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
  white-space: nowrap;
  cursor: pointer;
  border: none;
  text-decoration: none;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

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

.btn-primary:hover:not(:disabled) {
  background: var(--color-blue-hover);
  transform: translateY(-1px);
}

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

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

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

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

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

/* Text Button */
.btn-text {
  background: transparent;
  color: var(--color-blue);
  padding: var(--space-2) var(--space-3);
}

.btn-text:hover:not(:disabled) {
  color: var(--color-blue-hover);
}

/* Icon Button */
.btn-icon {
  padding: var(--space-2);
  border-radius: var(--radius-md);
  color: var(--color-text-secondary);
  background: transparent;
}

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

.btn-icon-sm {
  padding: var(--space-1);
}

.btn-icon-lg {
  padding: var(--space-3);
}

/* Button Sizes */
.btn-sm {
  padding: var(--space-2) var(--space-3);
  font-size: var(--font-size-xs);
  border-radius: var(--radius-sm);
}

.btn-lg {
  padding: var(--space-4) var(--space-6);
  font-size: var(--font-size-base);
  border-radius: var(--radius-lg);
}

/* Button with Icon */
.btn svg,
.btn-icon svg {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}

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

/* Button Group */
.btn-group {
  display: inline-flex;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--color-border);
}

.btn-group .btn {
  border-radius: 0;
  border: none;
  border-right: 1px solid var(--color-border);
}

.btn-group .btn:last-child {
  border-right: none;
}

.btn-group .btn.active {
  background: var(--color-blue);
  color: var(--color-text-inverse);
}

/* Toggle/Segmented Control - Apple style */
.segmented-control {
  display: inline-flex;
  background: var(--color-background);
  border-radius: var(--radius-md);
  padding: var(--space-1);
  gap: var(--space-1);
}

.segmented-control-item {
  padding: var(--space-2) var(--space-4);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  cursor: pointer;
  background: transparent;
  border: none;
}

.segmented-control-item:hover {
  color: var(--color-text-primary);
}

.segmented-control-item.active {
  background: var(--color-surface);
  color: var(--color-text-primary);
  box-shadow: var(--shadow-sm);
}

/* Segmented control that wraps on smaller screens */
.segmented-control-wrap {
  flex-wrap: wrap;
}

.segmented-control-wrap .segmented-control-item {
  padding: var(--space-2) var(--space-3);
}

@media (max-width: 600px) {
  .segmented-control-wrap {
    width: 100%;
    justify-content: center;
  }
}

/* Link styled as button */
.link {
  color: var(--color-blue);
  font-weight: var(--font-weight-medium);
  transition: color var(--transition-fast);
}

.link:hover {
  color: var(--color-blue-hover);
}

.link-underline {
  text-decoration: underline;
  text-underline-offset: 2px;
}

/* Action Link with Icon */
.action-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-blue);
  transition: gap var(--transition-fast);
}

.action-link:hover {
  gap: var(--space-2);
}

.action-link svg {
  width: 14px;
  height: 14px;
  transition: transform var(--transition-fast);
}

.action-link:hover svg {
  transform: translateX(2px);
}