.product-story,
.product-purchase { padding: 84px 0; }

.product-story { background: #fff; }

.product-story__intro {
  width: min(780px, 100%);
  margin: 0 auto 36px;
}

.product-story__intro h2,
.product-purchase__copy h2 {
  margin: 0 0 18px;
  color: #12352d;
  font-family: "Noto Serif TC", serif;
  font-size: clamp(32px, 4vw, 50px);
  line-height: 1.25;
}

.product-story__intro p,
.product-purchase__copy > p {
  margin: 0 0 16px;
  color: #53625d;
  font-size: 17px;
  line-height: 1.9;
}

.product-before-after {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.product-change-card {
  padding: 28px;
  border: 1px solid #dbe9e3;
  border-radius: 12px;
  background: #fff;
}

.product-change-card.is-after {
  border-color: #b9d7ca;
  background: #f1f8f4;
}

.product-change-card span {
  display: inline-block;
  margin-bottom: 10px;
  color: #b58a4b;
  font-size: 12px;
  font-weight: 900;
  letter-spacing: .12em;
}

.product-change-card h3 { margin: 0 0 10px; color: #12352d; font-size: 22px; }
.product-change-card p { margin: 0; color: #5e6a66; line-height: 1.8; }

.product-purchase { background: #f7fbf8; border-top: 1px solid #e1ebe6; }

.product-purchase__box {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(310px, .62fr);
  gap: 48px;
  align-items: start;
  padding: clamp(28px, 5vw, 56px);
  border: 1px solid #cfe0d8;
  border-radius: 16px;
  background: #fff;
  box-shadow: 0 24px 60px rgba(18, 53, 45, .09);
}

.product-includes {
  display: grid;
  gap: 11px;
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
}

.product-includes li {
  position: relative;
  padding-left: 28px;
  color: #344640;
  line-height: 1.7;
}

.product-includes li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: #2f6f5f;
  font-weight: 900;
}

.product-purchase__card {
  position: sticky;
  top: 100px;
  padding: 28px;
  color: #fff;
  background: #123f32;
  border-radius: 12px;
}

.product-purchase__card > span { color: #d9c18c; font-size: 12px; font-weight: 900; letter-spacing: .1em; }
.product-purchase__card strong { display: block; margin: 10px 0 20px; font-family: "Noto Serif TC", serif; font-size: 34px; }
.product-purchase__card .store-primary { width: 100%; color: #123f32; background: #fff; border-color: #fff; box-shadow: none; }
.product-purchase__card .store-primary:disabled { cursor: not-allowed; opacity: .58; }
.product-purchase__card p { margin: 16px 0 0; color: rgba(255,255,255,.72); font-size: 12px; line-height: 1.7; }

@media (max-width: 780px) {
  .product-story,
  .product-purchase { padding: 60px 0; }
  .product-before-after,
  .product-purchase__box { grid-template-columns: 1fr; }
  .product-purchase__box { gap: 28px; }
  .product-purchase__card { position: static; }
}