:root {
  color-scheme: light;
  --ink: #21313d;
  --muted: #586978;
  --quiet: #647585;
  --line: #dce3e8;
  --panel: #fff;
  --page: #f4f7f9;
  --accent: #175ba8;
  --accent-strong: #114d91;
  --field: #fff;
  --amber: #865118;
  --amber-soft: #fff5e5;
  --ok-soft: #edf4fa;
}
* {
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
  scroll-padding-top: 100px;
}
body {
  margin: 0;
  color: var(--ink);
  background: var(--page);
  font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  font-size: 15px;
  line-height: 1.5;
}
a {
  color: inherit;
  text-decoration: none;
}
button,
input,
select,
textarea {
  font: inherit;
}
button,
a,
input,
select,
textarea {
  touch-action: manipulation;
}
button {
  cursor: pointer;
}
h1,
h2,
h3,
p {
  margin-top: 0;
}
h1,
h2,
h3 {
  text-wrap: balance;
}
p {
  text-wrap: pretty;
}
h1 {
  font-size: clamp(48px, 6.4vw, 84px);
  letter-spacing: -0.055em;
  line-height: 1.02;
  margin-bottom: 26px;
  font-weight: 650;
}
h2 {
  font-size: clamp(26px, 3vw, 36px);
  letter-spacing: -0.035em;
  line-height: 1.15;
  margin-bottom: 12px;
  font-weight: 600;
}
h3 {
  font-size: 17px;
  line-height: 1.3;
  margin-bottom: 10px;
}
main {
  overflow: clip;
}
section {
  scroll-margin-top: 90px;
}
[hidden] {
  display: none !important;
}
.topbar {
  height: 80px;
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 24px;
  padding: 0 max(24px, calc((100vw - 1200px) / 2));
  background: rgba(255, 255, 255, 0.96);
  border-bottom: 1px solid var(--line);
}
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}
.brand-mark {
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  background: var(--ink);
  color: white;
  border-radius: 7px;
  font-size: 12px;
  font-weight: 700;
  box-shadow: inset 0 -4px #526d81;
}
.brand strong {
  display: block;
  font-size: 23px;
  letter-spacing: -0.04em;
  line-height: 1.1;
}
.brand small {
  display: block;
  font-size: 11px;
  color: var(--muted);
  margin-top: 3px;
}
nav {
  display: flex;
  gap: 8px;
}
nav a {
  font-size: 13px;
  font-weight: 500;
  display: flex;
  align-items: center;
  min-height: 44px;
  padding: 0 12px;
  border-radius: 6px;
}
nav a:hover {
  background: var(--page);
  color: var(--accent);
}
.hero {
  max-width: 1256px;
  margin: auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 76px;
  align-items: center;
  padding: 68px 28px 70px;
}
.hero-copy > p:not(.eyebrow) {
  max-width: 440px;
  color: var(--muted);
  font-size: 17px;
  line-height: 1.6;
}
.eyebrow {
  font-size: 13px;
  color: var(--accent);
  font-weight: 600;
  margin-bottom: 20px;
}
.hero-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 28px;
}
.primary-action,
.secondary-action,
.checkout-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 12px 20px;
  font-size: 14px;
  font-weight: 600;
  border-radius: 7px;
  border: 0;
  transition:
    background-color 0.16s,
    transform 0.16s;
}
.primary-action,
.checkout-button {
  color: white;
  background: var(--accent);
}
.primary-action:hover,
.checkout-button:hover {
  background: var(--accent-strong);
}
.secondary-action {
  background: white;
  box-shadow: inset 0 0 0 1px var(--line);
}
.secondary-action:hover {
  background: #e9eff4;
}
.hero-copy .hero-footnote {
  font-size: 12px !important;
  margin: 22px 0 0;
}
.primary-action:active,
.secondary-action:active,
button:active {
  transform: scale(0.96);
}
.panel-study {
  background: #e8eff4;
  border-radius: 18px;
  padding: 24px 28px;
  min-height: 405px;
  position: relative;
  overflow: hidden;
  background-image:
    linear-gradient(rgba(48, 77, 99, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(48, 77, 99, 0.04) 1px, transparent 1px);
  background-size: 24px 24px;
}
.study-caption {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  font-size: 12px;
  color: var(--muted);
}
.study-caption span:first-child {
  font-weight: 600;
  color: var(--ink);
}
.exploded-panel {
  position: relative;
  height: 282px;
  perspective: 900px;
  max-width: 370px;
  margin: 14px auto 0;
}
.layer {
  position: absolute;
  width: 80%;
  height: 130px;
  left: 10%;
  border-radius: 4px;
  transform: rotateX(55deg) rotateZ(-28deg);
  box-shadow: 8px 16px 18px rgba(27, 48, 65, 0.12);
}
.face-layer {
  background: repeating-conic-gradient(#2e3c47 0% 25%, #3c4c58 0% 50%) 0 0 / 8px
    8px;
  border-bottom: 6px solid #192730;
}
.top-layer {
  top: 2px;
  z-index: 3;
}
.core-layer {
  top: 57px;
  z-index: 2;
  background: #d6cbb6;
  border-bottom: 22px solid #bfb29a;
  background-image: repeating-linear-gradient(
    90deg,
    transparent 0 12px,
    rgba(139, 118, 84, 0.14) 12px 13px
  );
}
.bottom-layer {
  top: 124px;
  z-index: 1;
}
.layer-key {
  display: flex;
  justify-content: center;
  gap: 26px;
  font-size: 12px;
  color: var(--muted);
}
.layer-key span {
  display: flex;
  align-items: center;
  gap: 7px;
}
.layer-key i {
  width: 12px;
  height: 12px;
  border-radius: 3px;
}
.key-face {
  background: #344552;
}
.key-core {
  background: #c9bca4;
}
.panel-study > p {
  font-size: 13px;
  color: var(--muted);
  text-align: center;
  margin: 18px 0 0;
}
.materials-strip {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 24px;
  background: white;
  border-block: 1px solid var(--line);
  padding: 25px max(28px, calc((100vw - 1200px) / 2));
}
.materials-strip strong,
.materials-strip small {
  display: block;
}
.strip-label {
  font-size: 11px;
  color: var(--quiet);
}
.materials-strip strong {
  font-size: 14px;
  margin: 5px 0;
}
.materials-strip small {
  font-size: 12px;
  color: var(--muted);
}
.workbench {
  max-width: 1256px;
  margin: auto;
  padding: 64px 28px;
}
.section-heading {
  display: flex;
  justify-content: space-between;
  align-items: end;
  gap: 32px;
  margin-bottom: 24px;
}
.section-heading .eyebrow {
  margin-bottom: 8px;
}
.section-heading p:not(.eyebrow) {
  max-width: 470px;
  color: var(--muted);
  font-size: 14px;
  margin: 0;
}
.preset-row {
  display: flex;
  gap: 10px;
  margin-bottom: 22px;
  flex-wrap: wrap;
}
.preset-row button {
  min-height: 42px;
  padding: 9px 15px;
  border: 1px solid var(--line);
  border-radius: 22px;
  background: white;
  color: var(--muted);
  font-size: 13px;
  font-weight: 500;
  transition:
    background-color 0.16s,
    transform 0.16s;
}
.preset-row button[aria-pressed="true"] {
  border-color: #8dafd4;
  color: var(--accent);
  background: #e9f1fa;
}
.builder-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 405px;
  gap: 28px;
  align-items: start;
}
.config-panel,
.quote-panel {
  background: white;
  border-radius: 12px;
  box-shadow:
    0 2px 3px rgba(27, 48, 65, 0.03),
    0 0 0 1px var(--line);
}
.config-panel {
  overflow: hidden;
}
fieldset {
  min-width: 0;
  display: grid;
  gap: 18px;
  padding: 24px;
  margin: 0;
  border: 0;
  border-bottom: 1px solid var(--line);
}
fieldset:last-child {
  border: 0;
}
legend {
  float: left;
  width: 100%;
  font-size: 16px;
  font-weight: 600;
  padding: 0;
  margin-bottom: 18px;
}
fieldset > legend + * {
  clear: both;
}
label {
  display: grid;
  gap: 7px;
  font-size: 12px;
  color: var(--muted);
  font-weight: 500;
}
.field-grid,
.option-grid {
  display: grid;
  gap: 16px;
}
.two {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}
.option-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}
input,
select,
textarea {
  width: 100%;
  min-width: 0;
  min-height: 44px;
  background: #fff;
  border: 1px solid #b9c6d0;
  border-radius: 6px;
  color: var(--ink);
  font-size: 14px;
  padding: 10px 12px;
}
select {
  padding-right: 24px;
}
textarea {
  resize: vertical;
}
input:focus,
select:focus,
textarea:focus {
  border-color: var(--accent);
}
:focus-visible {
  outline: 3px solid #79a9de;
  outline-offset: 3px;
}
.input-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 40px;
}
.input-row input {
  border-radius: 6px 0 0 6px;
}
.input-row span {
  display: grid;
  place-items: center;
  background: var(--page);
  border: 1px solid #b9c6d0;
  border-left: 0;
  border-radius: 0 6px 6px 0;
  font-size: 12px;
}
.toggle {
  display: flex;
  align-items: center;
  gap: 10px;
  min-height: 44px;
  padding: 10px 12px;
  background: var(--page);
  border-radius: 6px;
  color: var(--ink);
}
.toggle input,
.consent input {
  width: 17px;
  min-height: 17px;
  height: 17px;
  margin: 0;
  accent-color: var(--accent);
  flex-shrink: 0;
}
.quote-panel {
  padding: 24px;
  position: sticky;
  top: 104px;
}
.quote-id,
.quote-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  color: var(--muted);
  font-size: 12px;
}
.quote-id {
  border-bottom: 1px solid var(--line);
  padding-bottom: 14px;
  margin-bottom: 18px;
}
.quote-id strong {
  font-weight: 500;
}
.status-pill {
  font-size: 11px;
  padding: 5px 8px;
  border-radius: 5px;
  background: #e7f0fa;
  color: var(--accent);
}
.status-pill.review {
  background: var(--amber-soft);
  color: var(--amber);
}
.price {
  font-size: 48px;
  font-weight: 600;
  letter-spacing: -0.04em;
  line-height: 1.1;
  margin: 15px 0 5px;
  font-variant-numeric: tabular-nums;
}
.estimate-note {
  font-size: 11px;
  line-height: 1.5;
  color: var(--quiet);
  margin: 8px 0 14px;
}
.metrics {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 8px;
  margin: 22px 0 16px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--line);
}
dt {
  color: var(--quiet);
  font-size: 11px;
}
dd {
  margin: 5px 0 0;
  font-size: 13px;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}
.panel-preview {
  display: grid;
  place-items: center;
  height: 110px;
  background: var(--page);
  border-radius: 7px;
  margin: 0 0 18px;
  padding: 15px;
}
.panel-preview > div {
  width: auto;
  height: 80px;
  max-width: 100%;
  max-height: 100%;
  background: repeating-conic-gradient(#30414d 0% 25%, #374a58 0% 50%) 0 0 / 6px
    6px;
  display: grid;
  place-items: center;
  box-shadow:
    3px 4px 0 #bcae93,
    5px 6px 0 #20303d;
  border-radius: 2px;
  padding: 5px;
}
#preview-dimensions {
  font-size: 11px;
  color: white;
  white-space: nowrap;
  background: #21313dcf;
  padding: 3px 6px;
  border-radius: 3px;
}
.quote-specs,
.quote-assumptions {
  margin: 0 0 16px;
}
.quote-specs > div,
.quote-assumptions > div {
  display: grid;
  grid-template-columns: 80px minmax(0, 1fr);
  gap: 12px;
  margin-bottom: 10px;
}
.quote-specs dd,
.quote-assumptions dd {
  margin: 0;
  font-weight: 400;
  font-size: 12px;
  line-height: 1.5;
}
.warnings {
  display: grid;
  gap: 8px;
  margin-bottom: 18px;
}
.warning {
  border-radius: 6px;
  padding: 10px 12px;
  background: var(--amber-soft);
  color: #80501f;
  font-size: 12px;
  line-height: 1.5;
}
.warning.ok {
  background: var(--ok-soft);
  color: #415e78;
}
.stack-card {
  margin: 0 0 20px;
  border-block: 1px solid var(--line);
  padding: 12px 0;
}
.stack-card summary {
  cursor: pointer;
  font-size: 12px;
  font-weight: 600;
  min-height: 24px;
}
.stack-card ol {
  color: var(--muted);
  font-size: 11px;
  line-height: 1.8;
  padding-left: 20px;
}
.checkout-button {
  width: 100%;
}
button:disabled {
  opacity: 0.5;
  cursor: default;
  transform: none;
}
.rfq-section {
  padding: 56px 28px;
  background: #e8eff4;
  border-block: 1px solid var(--line);
}
.rfq-layout {
  max-width: 1200px;
  margin: auto;
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: 70px;
}
.rfq-layout > div > p {
  max-width: 400px;
  color: var(--muted);
  font-size: 14px;
}
.request-summary {
  white-space: pre-line;
  font-size: 15px;
  line-height: 1.9;
  padding: 20px 0;
  font-variant-numeric: tabular-nums;
  border-block: 1px solid #cbd7df;
  margin: 24px 0 14px;
}
.rfq-form {
  display: grid;
  gap: 20px;
  background: white;
  padding: 28px;
  border-radius: 12px;
  box-shadow: 0 2px 4px #20303d08;
}
.optional {
  font-weight: 400;
  color: var(--quiet);
  font-size: 11px;
}
.consent {
  display: flex;
  align-items: start;
  gap: 10px;
  line-height: 1.5;
}
.consent input {
  margin-top: 2px;
}
.honeypot {
  position: absolute;
  left: -10000px;
  width: 1px;
  height: 1px;
  overflow: hidden;
}
#rfq-status {
  margin: 0;
  font-size: 14px;
  color: var(--muted);
  overflow-wrap: anywhere;
}
#rfq-status:empty {
  display: none;
}
#rfq-status[data-state="sent"] {
  padding: 14px;
  background: #edf5ed;
  color: #315a3e;
  border-radius: 6px;
}
#rfq-status[data-state="error"] {
  color: #98421f;
}
.rfq-form > .estimate-note {
  margin: 0;
}
.how-it-works {
  max-width: 1256px;
  margin: auto;
  padding: 64px 28px;
}
.steps {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 50px;
  margin-top: 32px;
}
.steps article > span {
  display: grid;
  place-items: center;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: #dfe9f2;
  color: var(--accent);
  font-size: 13px;
  margin-bottom: 18px;
}
.steps p {
  color: var(--muted);
  font-size: 14px;
  max-width: 310px;
}
footer {
  border-top: 1px solid var(--line);
  padding: 28px max(28px, calc((100vw - 1200px) / 2));
  display: flex;
  gap: 24px;
  align-items: center;
  color: var(--muted);
  font-size: 12px;
  background: white;
}
.footer-brand {
  color: var(--ink);
  font-size: 21px;
  font-weight: 600;
  letter-spacing: -0.04em;
}
footer > a:last-child {
  margin-left: auto;
}
.gallery {
  max-width: 1256px;
  margin: auto;
  padding: 56px 28px;
}
.gallery-head {
  max-width: 700px;
  margin-bottom: 40px;
}
.gallery-head h1 {
  font-size: clamp(38px, 5vw, 58px);
}
.gallery-head > p:not(.eyebrow) {
  color: var(--muted);
  max-width: 570px;
  font-size: 16px;
}
.part-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
}
.part {
  background: white;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 0 0 1px var(--line);
}
.part-art {
  height: 140px;
  background: #e6edf3;
  display: grid;
  place-items: center;
}
.part-shape {
  width: 150px;
  height: 65px;
  transform: rotate(-14deg);
  border-radius: 3px;
  background: repeating-conic-gradient(#30414d 0% 25%, #374a58 0% 50%) 0 0 / 6px
    6px;
  box-shadow:
    3px 5px 0 #bcae93,
    5px 7px 0 #20303d;
}
.part-shape.glass {
  background: #c5d0bd;
  box-shadow:
    3px 5px 0 #e3d4b7,
    5px 7px 0 #a8b89d;
}
.part-shape.solid {
  box-shadow: 2px 3px 0 #20303d;
}
.part-body {
  padding: 22px;
}
.part-body p {
  color: var(--muted);
  font-size: 13px;
}
.part-body .spec {
  font-size: 11px;
}
.part-body a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  color: var(--accent);
  font-weight: 600;
  font-size: 13px;
}
@media (max-width: 1000px) {
  .hero {
    gap: 36px;
    padding-top: 48px;
    padding-bottom: 48px;
  }
  .builder-grid {
    grid-template-columns: minmax(0, 1fr) 350px;
    gap: 20px;
  }
  .quote-panel {
    padding: 20px;
  }
  .rfq-layout {
    gap: 36px;
  }
  .study-caption {
    font-size: 10px;
  }
  .part-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .section-heading {
    align-items: start;
  }
  .section-heading p:not(.eyebrow) {
    max-width: 360px;
  }
}
@media (max-width: 760px) {
  html {
    scroll-padding-top: 125px;
  }
  .topbar {
    height: auto;
    min-height: 100px;
    padding: 12px 20px;
    flex-wrap: wrap;
    gap: 8px;
  }
  .brand strong {
    font-size: 21px;
  }
  nav {
    width: 100%;
    gap: 0;
    justify-content: space-between;
  }
  nav a {
    padding: 0 6px;
    min-height: 40px;
    font-size: 12px;
  }
  .hero {
    grid-template-columns: 1fr;
    padding: 36px 20px;
    gap: 32px;
  }
  .hero-copy > p:not(.eyebrow) {
    font-size: 16px;
  }
  .hero h1 {
    font-size: 60px;
  }
  .panel-study {
    min-height: 340px;
    padding: 20px;
  }
  .exploded-panel {
    height: 264px;
    margin: 4px auto 0;
    max-width: 330px;
  }
  .materials-strip {
    grid-template-columns: 1fr 1fr;
    padding: 22px 20px;
    gap: 22px;
  }
  .workbench,
  .how-it-works {
    padding: 40px 20px;
  }
  .section-heading {
    display: block;
  }
  .section-heading p:not(.eyebrow) {
    max-width: none;
  }
  .section-heading h2 {
    margin-bottom: 16px;
  }
  .builder-grid,
  .rfq-layout {
    grid-template-columns: 1fr;
  }
  .quote-panel {
    position: static;
    padding: 22px;
  }
  fieldset {
    padding: 22px 18px;
  }
  .two {
    gap: 12px;
  }
  .metrics {
    grid-template-columns: 1fr 1fr 1fr;
  }
  .quote-specs > div,
  .quote-assumptions > div {
    grid-template-columns: 85px 1fr;
  }
  .rfq-section {
    padding: 40px 20px;
  }
  .rfq-form {
    padding: 22px 18px;
  }
  .rfq-form .two {
    grid-template-columns: 1fr;
  }
  .steps {
    grid-template-columns: 1fr;
    gap: 24px;
  }
  .steps article {
    padding-left: 48px;
    position: relative;
  }
  .steps article > span {
    position: absolute;
    top: 0;
    left: 0;
  }
  .steps p {
    max-width: none;
  }
  .gallery {
    padding: 36px 20px;
  }
  .part-grid {
    grid-template-columns: 1fr;
  }
  .part-art {
    height: 150px;
  }
  .gallery-head {
    margin-bottom: 28px;
  }
  footer {
    padding: 24px 20px;
    gap: 14px;
  }
  footer span {
    font-size: 11px;
  }
  .preset-row {
    gap: 7px;
  }
  .preset-row button {
    padding: 8px 12px;
    font-size: 12px;
  }
}
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *::before,
  *::after {
    transition: none !important;
    animation: none !important;
  }
}
/* Procurement details */
.field-help {
  font-size: 11px;
  line-height: 1.6;
  color: var(--muted);
  margin: 0;
  max-width: 65ch;
}
.price-range {
  font-size: 13px;
  font-weight: 500;
  color: var(--muted);
  margin: 7px 0;
}
.price.unpriced {
  font-size: 30px;
  letter-spacing: -0.025em;
}
.quote-detail {
  border-top: 1px solid var(--line);
  padding: 14px 0;
  font-size: 12px;
}
.quote-detail > summary {
  cursor: pointer;
  font-weight: 600;
  min-height: 30px;
}
.quote-lines {
  margin: 10px 0;
}
.quote-lines > div {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  padding: 5px 0;
}
.quote-lines dt {
  font-size: 12px;
  color: var(--muted);
}
.quote-lines dd {
  white-space: nowrap;
  margin: 0;
  font-weight: 500;
}
.quote-basis {
  padding-left: 18px;
  font-size: 11px;
  color: var(--muted);
  line-height: 1.7;
}
.quote-detail table {
  border-collapse: collapse;
  width: 100%;
  font-variant-numeric: tabular-nums;
  margin: 8px 0;
}
.quote-detail th,
.quote-detail td {
  text-align: right;
  padding: 7px 4px;
  border-bottom: 1px solid var(--line);
  font-size: 11px;
}
.quote-detail th:first-child,
.quote-detail td:first-child {
  text-align: left;
}
.quote-panel {
  position: static;
}
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}
.skip-link {
  position: fixed;
  left: 16px;
  top: -100px;
  z-index: 100;
  background: white;
  color: var(--accent);
  padding: 14px;
  border-radius: 6px;
}
.skip-link:focus {
  top: 12px;
}
input[readonly] {
  background: var(--page);
  color: var(--quiet);
}
.quote-panel .estimate-note {
  overflow-wrap: anywhere;
}
.download-button {
  width: 100%;
  margin-top: 10px;
  border: 0;
  cursor: pointer;
}
.builder-grid {
  align-items: start;
}
input,
select,
textarea {
  scroll-margin-top: 130px;
}
.quote-detail summary:hover {
  color: var(--accent);
}

[hidden] {
  display: none !important;
}
.custom-grid {
  display: grid;
  gap: 12px;
}
.hero-footnote a {
  color: var(--accent);
  text-decoration: underline;
}

/* ---- Design walk-through ---- */
.walk-body {
  scroll-snap-type: y proximity;
}
.walk {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 24px 80px;
}
.walk-step {
  min-height: calc(100vh - 80px);
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 18px;
  padding: 64px 0;
  scroll-snap-align: start;
  scroll-margin-top: 80px;
  border-bottom: 1px solid var(--line);
}
.walk-step:last-child {
  border-bottom: 0;
}
.walk-step h1 {
  font-size: clamp(34px, 5vw, 52px);
  line-height: 1.05;
  letter-spacing: -0.03em;
  margin: 0;
}
.walk-step h2 {
  font-size: clamp(26px, 3.4vw, 36px);
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin: 0;
}
.walk-lede {
  font-size: 17px;
  color: var(--muted);
  max-width: 560px;
  margin: 0;
}
.walk-count {
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0;
  font-weight: 600;
}
.walk-why {
  color: var(--muted);
  margin: 0;
  max-width: 560px;
}
.walk-hint {
  font-size: 12px;
  color: var(--quiet);
  margin: 0;
}
.walk-fields {
  display: grid;
  gap: 16px;
}
.walk-fields.two {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}
.walk-fields input,
.walk-fields select {
  font-size: 18px;
  min-height: 52px;
}
.walk-next {
  align-self: flex-start;
  margin-top: 8px;
}
.walk-choices {
  display: grid;
  gap: 10px;
}
.choice {
  display: grid;
  grid-template-columns: 22px minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: white;
  cursor: pointer;
  font-size: 14px;
  color: var(--ink);
  transition:
    border-color 0.15s,
    background-color 0.15s;
}
.choice:hover {
  border-color: #8dafd4;
}
.choice:has(input:checked) {
  border-color: var(--accent);
  background: #e9f1fa;
  box-shadow: 0 0 0 1px var(--accent);
}
.choice input {
  width: 18px;
  min-height: 0;
  height: 18px;
  margin: 3px 0 0;
  accent-color: var(--accent);
}
.choice strong {
  display: block;
  font-size: 15px;
}
.choice small {
  display: block;
  color: var(--muted);
  font-size: 12.5px;
  line-height: 1.45;
  margin-top: 3px;
}
.walk-sketch {
  display: grid;
  place-items: center;
  height: 240px;
  background: var(--page);
  border: 1px dashed var(--line);
  border-radius: 10px;
}
.sketch-panel {
  display: grid;
  place-items: center;
  background: repeating-conic-gradient(#30414d 0% 25%, #374a58 0% 50%) 0 0 / 6px 6px;
  box-shadow:
    4px 5px 0 #bcae93,
    7px 8px 0 #20303d;
  border-radius: 2px;
  transition:
    width 0.2s,
    height 0.2s;
}
.sketch-panel span {
  font-size: 12px;
  color: white;
  background: #21313dcf;
  padding: 3px 7px;
  border-radius: 3px;
  white-space: nowrap;
}
.walk-rail {
  position: fixed;
  left: max(16px, calc((100vw - 1100px) / 2));
  top: 50%;
  transform: translateY(-50%);
  z-index: 10;
}
.walk-rail ol {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
  counter-reset: step;
}
.walk-rail a {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 12px;
  color: var(--quiet);
  counter-increment: step;
}
.walk-rail a::before {
  content: counter(step);
  display: grid;
  place-items: center;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  border: 1px solid var(--line);
  background: white;
  font-size: 11px;
  font-weight: 600;
}
.walk-rail a[aria-current="step"] {
  color: var(--accent);
  font-weight: 600;
}
.walk-rail a[aria-current="step"]::before {
  background: var(--accent);
  border-color: var(--accent);
  color: white;
}
.walk-ticker {
  position: fixed;
  right: max(16px, calc((100vw - 1100px) / 2));
  bottom: 20px;
  z-index: 10;
  width: min(300px, calc(100vw - 32px));
  background: white;
  border-radius: 10px;
  padding: 12px 14px;
  box-shadow:
    0 6px 20px rgba(27, 48, 65, 0.12),
    0 0 0 1px var(--line);
  display: grid;
  gap: 3px;
  transition:
    opacity 0.2s,
    transform 0.2s;
}
.walk-ticker.is-hidden {
  opacity: 0;
  transform: translateY(12px);
  pointer-events: none;
}
.ticker-label {
  font-size: 10px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--quiet);
}
.walk-ticker strong {
  font-size: 13px;
  line-height: 1.35;
}
.walk-ticker small {
  font-size: 11px;
  color: var(--muted);
  line-height: 1.4;
}
.walk-result {
  justify-content: flex-start;
}
.result-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 28px;
  align-items: start;
}
.checks-title {
  margin: 0 0 10px;
  font-size: 14px;
}
.stack-visual {
  display: grid;
  gap: 2px;
  margin: 8px 0 4px;
  padding: 14px;
  background: var(--page);
  border-radius: 8px;
}
.stack-skin,
.stack-core {
  display: grid;
  place-items: center;
  font-size: 11px;
  border-radius: 2px;
  color: white;
  font-weight: 600;
}
.stack-skin {
  background: repeating-conic-gradient(#30414d 0% 25%, #374a58 0% 50%) 0 0 / 6px 6px;
}
.stack-core {
  background: #e4d6b6;
  color: #5a4a2a;
}
.walk-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 12px;
}
.walk-actions .checkout-button {
  flex: 1 1 200px;
}
@media (max-width: 1100px) {
  .walk-rail {
    display: none;
  }
}
@media (max-width: 760px) {
  .walk-step {
    min-height: 0;
    padding: 48px 0;
  }
  .walk-fields.two,
  .result-grid {
    grid-template-columns: 1fr;
  }
  .walk-ticker {
    right: 16px;
    left: 16px;
    width: auto;
  }
}
@media (prefers-reduced-motion: reduce) {
  .walk-body {
    scroll-snap-type: none;
  }
}
/* ---- configurator features ---- */
/* Edge, taper, insert, and coupon options the current core cannot use. */
select option:disabled {
  color: var(--quiet);
}
#quote-thickness {
  font-variant-numeric: tabular-nums;
  overflow-wrap: anywhere;
}

[hidden] { display: none !important; }
.guide-controls { margin-block: 1rem; padding: 1rem; background: #eef3f7; border-left: 4px solid #305b78; }
.guide-controls button { margin-right: .6rem; padding: .6rem 1rem; }

.guide-controls label { display: flex; align-items: center; gap: .6rem; }
.guide-controls input[type="checkbox"] { width: 1.1rem; height: 1.1rem; margin: 0; }
.guide-controls p { margin: .6rem 0; }