.kit-hero {
  padding-block: clamp(36px, 6vw, 76px);
  background: radial-gradient(ellipse at 85% 5%, #152844 0%, transparent 60%), var(--navy);
  border-top: 1px solid #ffffff14;
}
.kit-hero h1 {
  margin: 8px 0 10px;
  font-size: clamp(32px, 5vw, 56px);
  line-height: 1.35;
  letter-spacing: -.035em;
}
.kit-hero p { color: #b8c3d4; max-width: 55ch; }
.kit-section { padding-block: clamp(32px, 5vw, 64px); }
.kit-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(255px, .43fr);
  column-gap: clamp(22px, 3vw, 38px);
  align-items: start;
}
.kit-master-heading { grid-column: 1 / -1; }
.kit-step { margin: 0 0 32px; padding: 0; border: 0; min-width: 0; }
.kit-step:last-child { margin-bottom: 0; }
.kit-step legend, .kit-master-title {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: clamp(17px, 2vw, 21px);
  font-weight: 700;
  line-height: 1.5;
}
.kit-step-number {
  display: inline-grid;
  place-items: center;
  flex: 0 0 32px;
  height: 32px;
  border-radius: 5px;
  background: var(--yellow);
  color: var(--navy);
  font-size: 13px;
  font-weight: 800;
}
.kit-step-intro { margin: 8px 0 14px; color: var(--muted); font-size: 14px; }
.kit-options { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
.kit-option {
  position: relative;
  display: flex;
  flex-direction: column;
  min-width: 0;
  cursor: pointer;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  overflow: hidden;
}
.kit-option:hover { border-color: #a99746; }
.kit-option:has(input:checked) { border-color: #a48a00; box-shadow: 0 0 0 1px #a48a00; }
.kit-option:has(input:checked) .kit-option-copy { background: #fffbea; }
.kit-option input[type="radio"] {
  position: absolute;
  top: 13px;
  right: 13px;
  z-index: 1;
  width: 19px;
  height: 19px;
  margin: 0;
  accent-color: #7e6600;
  cursor: pointer;
}
.kit-option .product-image {
  display: flex;
  height: clamp(135px, 17vw, 210px);
  padding: 34px 12px 8px;
}
.kit-option-copy { display: grid; gap: 6px; flex: 1; padding: 15px; }
.kit-option:not(:has(img)) .kit-option-copy { padding-right: 37px; }
.kit-option-name { color: var(--ink); font-size: 18px; font-weight: 800; line-height: 1.5; }
.kit-option-description { color: var(--muted); font-size: 14px; line-height: 1.65; }
.kit-summary {
  position: sticky;
  top: 125px;
  min-width: 0;
  padding: clamp(18px, 2.5vw, 26px);
  color: #f4f6f8;
  background: #0a1426;
  border: 1px solid #34455e;
  border-top: 3px solid var(--yellow);
  border-radius: 8px;
}
.kit-summary h2 { margin: 6px 0 9px; font-size: 22px; }
.kit-summary p, .kit-summary li { font-size: 14px; line-height: 1.7; color: #c2ccdc; }
.kit-summary ul { padding-left: 20px; margin: 12px 0; }
.kit-summary .kit-date {
  margin: 13px 0 0;
  padding-top: 13px;
  border-top: 1px solid #34455e;
  color: var(--yellow);
}
.kit-summary .button { margin-top: 16px; width: 100%; justify-content: space-between; }
.kit-support { display: flex; flex-wrap: wrap; gap: 10px 22px; margin-top: 28px; }
.kit-specs { margin-top: 38px; }
.kit-specs .spec-details { margin-top: 12px; }
@media (max-width: 800px) {
  .kit-layout { grid-template-columns: minmax(0, 1fr); }
  .kit-summary { position: static; margin-top: 22px; }
}
@media (max-width: 420px) {
  #connection-step .kit-options { grid-template-columns: minmax(0, 1fr); }
  .kit-options { gap: 10px; }
  .kit-option-copy { padding: 12px; }
  .kit-option .product-tag { left: 8px; }
}