/* Buttons: primary, secondary, ghost, danger; sizes and icon-only. */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  min-block-size: var(--touch);
  padding: 0 var(--space-4);
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  background: var(--color-surface-2);
  color: var(--color-text);
  font-weight: 600;
  font-size: var(--text-md);
  text-decoration: none;
  cursor: pointer;
  transition: background var(--transition), border-color var(--transition);
  -webkit-tap-highlight-color: transparent;
}
.btn:hover { text-decoration: none; }
.btn:disabled, .btn[aria-disabled="true"] { opacity: 0.55; cursor: not-allowed; }

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

.btn--secondary { background: var(--color-surface); border-color: var(--color-border-strong); }
.btn--secondary:hover:not(:disabled) { background: var(--color-surface-2); }

.btn--ghost { background: transparent; }
.btn--ghost:hover:not(:disabled) { background: var(--color-surface-2); }

.btn--danger { background: var(--color-danger); color: var(--color-on-danger); }
.btn--danger:hover:not(:disabled) { filter: brightness(0.92); }

.btn--success { background: var(--color-success); color: var(--color-on-success); }

.btn--block { inline-size: 100%; }
/* Smaller text and padding only: every button keeps the 44px touch target. */
.btn--sm { padding: 0 var(--space-3); font-size: var(--text-sm); }
.btn--lg { min-block-size: 52px; font-size: var(--text-lg); }

.btn--icon {
  inline-size: var(--touch);
  padding: 0;
  background: transparent;
}
.btn--icon:hover:not(:disabled) { background: var(--color-surface-2); }

.btn { --spinner-color: var(--color-text); }
.btn--primary { --spinner-color: var(--color-on-primary); }
.btn--danger { --spinner-color: var(--color-on-danger); }
.btn--success { --spinner-color: var(--color-on-success); }
.btn.is-loading { position: relative; color: transparent; pointer-events: none; }
.btn.is-loading::after {
  content: "";
  position: absolute;
  inline-size: 18px;
  block-size: 18px;
  border: 2px solid currentColor;
  border-color: var(--spinner-color) transparent var(--spinner-color) transparent;
  border-radius: 50%;
  animation: btn-spin 0.8s linear infinite;
}
@keyframes btn-spin { to { transform: rotate(360deg); } }

.btn-row { display: flex; flex-wrap: wrap; gap: var(--space-2); }