.checkout-main { padding: 46px 0 80px; min-height: 65vh; background: #f4f6f8; color: #111820; }
.checkout-breadcrumb { display: inline-flex; margin-bottom: 28px; color: #3d5871; font-size: 14px; text-decoration: none; }
.checkout-heading { margin: 0 0 32px; font-size: clamp(30px,4vw,44px); line-height: 1.15; letter-spacing: -.03em; }
.checkout-layout { display: grid; grid-template-columns: minmax(0,1.1fr) minmax(0,.9fr); gap: 28px; align-items: start; }
.checkout-product, .checkout-summary, .checkout-selection { background: #fff; border: 1px solid #dce2e8; padding: 32px; }
.checkout-product img { display: block; width: 100%; height: 280px; object-fit: contain; margin: 0 0 28px; background: #09111b; }
.checkout-product h2 { margin: 0 0 14px; font-size: clamp(24px,3vw,32px); line-height: 1.2; letter-spacing: -.03em; }
.checkout-product p, .checkout-summary p, .checkout-selection p { font-size: 15px; line-height: 1.65; color: #4f5d6c; }
.checkout-product p { margin: 12px 0; }
.checkout-summary h2 { font-size: 20px; margin: 0 0 25px; }
.checkout-price-row { display: flex; align-items: center; justify-content: space-between; gap: 18px; padding-bottom: 22px; border-bottom: 1px solid #e3e8ed; }
.checkout-price-row span { font-size: 14px; color: #4f5d6c; }
.checkout-price-row strong { font-size: 29px; font-weight: 650; white-space: nowrap; }
.checkout-summary .shop-notice { margin: 24px 0; }
.checkout-summary .shop-button { display: flex; justify-content: center; width: 100%; margin: 12px 0; }
.checkout-summary .checkout-small { font-size: 12px; color: #697684; margin: 16px 0 0; }
.checkout-selection-links { display: flex; gap: 14px; flex-wrap: wrap; margin-top: 24px; }
.checkout-main [hidden], .shop-page [hidden] { display: none !important; }
@media (max-width: 760px) {
  .checkout-main { padding-top: 28px; padding-bottom: 46px; }
  .checkout-layout { grid-template-columns: 1fr; gap: 18px; }
  .checkout-product, .checkout-summary, .checkout-selection { padding: 24px; }
  .checkout-product img { height: 220px; }
}