/* ==========================================================================
   Turbo Themes - Buttons
   ========================================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-xl);
  min-height: 44px;
  font-size: 1rem;
  font-weight: 600;
  text-decoration: none;
  border: none;
  border-radius: var(--radius-lg);
  cursor: pointer;
  /* Transform/shadow only — animating color/background during theme swaps
     produces mid-flight contrast that fails WCAG AA (and axe) scans. */
  transition:
    transform var(--transition-fast),
    box-shadow var(--transition-fast);
}

@media (prefers-reduced-motion: reduce) {
  .btn {
    transition: none;
  }
}

.btn:hover:not(:disabled) {
  transform: translateY(-2px);
  text-decoration: none;
}

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

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

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

/* Primary — gradient fill (falls back to solid brand). Ink uses
   text-on-brand, the token audited at build time against BOTH
   `--gradient-primary` stops (brand.primary and state.info) so the label
   clears AA at either end of the ramp in light and dark themes.
   Include `a.btn-primary` (+ hover/focus) so link CTAs beat global
   `a`/`a:hover` accent rules that share equal specificity and load later
   on the docs site. */
a.btn-primary,
a.btn-primary:hover,
a.btn-primary:focus,
a.btn-primary:focus-visible,
.btn-primary {
  color: var(
    --turbo-text-on-brand,
    var(--turbo-brand-primary-text, var(--turbo-text-inverse))
  );
  background: var(--gradient-primary, var(--turbo-brand-primary));
  box-shadow: var(--shadow-md);
}

.btn-primary:hover:not(:disabled) {
  box-shadow: var(--shadow-lg), var(--shadow-glow);
}

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

.btn-secondary:hover:not(:disabled) {
  background: var(--turbo-bg-overlay);
  border-color: var(--turbo-brand-primary);
}

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

.btn-ghost:hover:not(:disabled) {
  color: var(--turbo-text-primary);
  background: color-mix(in srgb, var(--turbo-brand-primary) 10%, transparent);
}

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

.btn-outline:hover:not(:disabled) {
  color: var(--turbo-brand-primary-text, var(--turbo-text-inverse));
  background: var(--turbo-brand-primary);
}

/* State variants - use per-state text tokens with bg-base fallback (#267) */
.btn-success {
  color: var(--turbo-state-success-text, var(--turbo-bg-base));
  background: var(--turbo-state-success);
}

.btn-success:hover:not(:disabled) {
  background: color-mix(in srgb, var(--turbo-state-success) 85%, black);
}

.btn-warning {
  color: var(--turbo-state-warning-text, var(--turbo-bg-base));
  background: var(--turbo-state-warning);
}

.btn-warning:hover:not(:disabled) {
  background: color-mix(in srgb, var(--turbo-state-warning) 85%, black);
}

.btn-danger {
  color: var(--turbo-state-danger-text, var(--turbo-bg-base));
  background: var(--turbo-state-danger);
}

.btn-danger:hover:not(:disabled) {
  background: color-mix(in srgb, var(--turbo-state-danger) 85%, black);
}

.btn-info {
  color: var(--turbo-state-info-text, var(--turbo-bg-base));
  background: var(--turbo-state-info);
}

.btn-info:hover:not(:disabled) {
  background: color-mix(in srgb, var(--turbo-state-info) 85%, black);
}

/* Sizes — keep WCAG 2.2 AA target size (24×24; site chrome uses 44×44) */
.btn-sm {
  padding: var(--space-sm) var(--space-md);
  min-height: 44px;
  min-width: 44px;
  font-size: 0.875rem;
  border-radius: var(--radius-md);
}

.btn-lg {
  padding: var(--space-lg) var(--space-2xl);
  font-size: 1.125rem;
  border-radius: var(--radius-xl);
}

/* Button group */
.btn-group {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}