/* ============ product page ============ */
.pdp { padding: 1.5rem var(--gutter) 0; }

.crumb {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  color: var(--mist);
  margin-bottom: 1.75rem;
}
.crumb a { border-bottom: 1px solid transparent; }
.crumb a:hover { border-color: var(--ink); }

.pdp-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: clamp(2rem, 5vw, 5rem);
  align-items: start;
  max-width: 76rem;
  margin-inline: auto;
}
@media (max-width: 860px) { .pdp-grid { grid-template-columns: 1fr; } }

.pdp-main { aspect-ratio: 1; }

.pdp-thumbs {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 0.6rem;
  margin-top: 0.6rem;
}
.pdp-thumbs button {
  border: 1px solid var(--hairline);
  background: var(--paper);
  padding: 0;
  cursor: pointer;
  aspect-ratio: 1;
  overflow: hidden;
  transition: border-color 0.15s;
}
.pdp-thumbs button.is-active,
.pdp-thumbs button:hover { border-color: var(--ink); }
.pdp-thumbs img { width: 100%; height: 100%; object-fit: cover; }

.pdp-title {
  font-family: var(--display);
  font-size: clamp(2.2rem, 4.6vw, 3.6rem);
  line-height: 1.02;
  text-transform: uppercase;
}
.pdp-desc { margin: 1.25rem 0 1.75rem; max-width: 36rem; }
.pdp-desc p { margin-bottom: 0.8rem; }

.spec-k {
  font-family: var(--mono);
  font-size: 0.64rem;
  letter-spacing: 0.16em;
  color: var(--mist);
  display: inline-block;
  width: 6.5rem;
}

.buy-row {
  display: flex;
  gap: 0.9rem;
  align-items: stretch;
  margin-top: 0.5rem;
}
.qty {
  display: flex;
  align-items: center;
  border: 1px solid var(--ink);
}
.qty button {
  font-family: var(--mono);
  font-size: 1rem;
  background: none;
  border: none;
  cursor: pointer;
  width: 2.6rem;
  height: 100%;
  color: var(--ink);
}
.qty button:hover { background: var(--ghost); }
.qty span {
  font-family: var(--mono);
  min-width: 2rem;
  text-align: center;
  font-variant-numeric: tabular-nums;
}
.buy-row .btn-buy { flex: 1; width: auto; }
@media (max-width: 480px) {
  .buy-row { flex-direction: column; }
  .qty { justify-content: center; padding: 0.6rem 0; }
}

.protocol {
  max-width: 76rem;
  margin: clamp(3rem, 7vw, 6rem) auto 0;
  padding-bottom: clamp(3rem, 7vw, 6rem);
}
.protocol h2 { margin-bottom: 2rem; }
.steps-light { margin-top: 0; }
.steps-light li { border-top: 1px solid var(--ink); }
.steps-light .step-no { color: var(--mist); }
.steps-light p { color: var(--ink); }