/* Buttons — design.md §9. Five variants, full state set, Jost label type. */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  height: 48px;                /* mobile */
  padding-inline: var(--space-8);
  border-radius: var(--radius-md);
  border: none;
  font-family: var(--font-label);
  font-size: var(--type-button-size);
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  line-height: 1;
  cursor: pointer;
  transition: background-color 200ms var(--easing-standard),
              color 200ms var(--easing-standard),
              border-color 200ms var(--easing-standard),
              transform 100ms ease-out;
  white-space: nowrap;
}

@media (min-width: 1024px) {
  .btn { height: 52px; }
}

.btn:active { transform: scale(0.98); } /* §2.4 pressed */

.btn:disabled {
  opacity: var(--opacity-disabled);
  pointer-events: none;
}

/* Variants (§9) */
.btn--primary {
  background: var(--accent-gold);
  color: var(--color-neutral-50);
}

.btn--primary:hover { background: var(--accent-gold-hover); }

.btn--secondary {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--text-primary);
}

.btn--secondary:hover {
  background: var(--text-primary);
  color: var(--surface-background);
}

.btn--ghost {
  background: transparent;
  color: var(--accent-gold);
  padding-inline: var(--space-6);
}

.btn--ghost:hover { color: var(--accent-gold-hover); }

.btn--text {
  background: transparent;
  color: var(--accent-gold);
  height: auto;
  padding: 0;
  border-radius: 0;
}

.btn--text:hover { text-decoration: underline; text-underline-offset: 4px; }

.btn--icon {
  width: 44px;
  height: 44px;
  padding: 0;
  background: var(--surface-primary);
  color: var(--text-primary);
  border: var(--border-hairline);
  border-radius: var(--radius-full);
}

.btn--danger {
  background: var(--color-error);
  color: var(--color-neutral-50);
}

/* Loading — thin rotating gold ring, width locked by caller (§9) */
.btn--loading {
  pointer-events: none;
  color: transparent !important;
  position: relative;
}

.btn--loading::after {
  content: "";
  position: absolute;
  width: 16px;
  height: 16px;
  border: 2px solid rgba(255, 255, 255, 0.35);
  border-top-color: var(--color-neutral-50);
  border-radius: var(--radius-full);
  animation: btn-spin 700ms linear infinite;
}

.btn--ghost.btn--loading::after,
.btn--secondary.btn--loading::after {
  border-color: rgba(176, 141, 87, 0.3);
  border-top-color: var(--accent-gold);
}

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

/* Success (post-add-to-bag) — 1200ms then revert, handled in JS (§9) */
.btn--success-flash {
  background: var(--color-success) !important;
  color: var(--color-neutral-50) !important;
}

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