.subpage {
  min-height: 100vh;
  background: var(--paper);
}

.subpage-header {
  position: sticky;
  top: 0;
  z-index: 50;
  min-height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 40px;
  border-bottom: 1px solid var(--line);
  background: rgba(245, 241, 232, 0.92);
  backdrop-filter: blur(14px);
}

.subpage-nav {
  display: flex;
  align-items: center;
  gap: 22px;
  font: 650 13px/1 var(--display);
}

.subpage-nav a {
  text-decoration: none;
}

.subpage-nav .subpage-language {
  padding: 7px 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
}

.subpage-hero {
  padding: 118px 0 100px;
}

.subpage-inner {
  width: var(--page);
  margin: 0 auto;
}

.subpage-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 0.72fr);
  gap: 76px;
  align-items: center;
}

.subpage-hero h1 {
  max-width: 850px;
  font-size: clamp(48px, 5.8vw, 84px);
}

.subpage-lead {
  max-width: 720px;
  margin: 28px 0 0;
  color: var(--text-soft);
  font-size: clamp(19px, 1.8vw, 24px);
  line-height: 1.55;
}

.subpage-actions {
  display: flex;
  gap: 20px;
  margin-top: 36px;
}

.product-link-object {
  position: relative;
  padding: 34px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: linear-gradient(145deg, #fbf8f1, #e9e1d0);
  box-shadow: 0 34px 64px -40px rgba(11, 13, 18, 0.58);
}

.product-link-object::before {
  content: "";
  position: absolute;
  inset: -26px 32px 26px -32px;
  z-index: -1;
  border: 1px solid rgba(36, 119, 95, 0.2);
  border-radius: 50%;
}

.product-link-object .source-status {
  position: static;
  justify-content: flex-end;
  margin-bottom: 54px;
}

.product-url {
  margin: 0;
  font: 650 clamp(18px, 2vw, 27px)/1.25 var(--mono);
  word-break: break-word;
}

.product-meta {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  margin: 28px 0 0;
  padding-top: 20px;
  border-top: 1px solid var(--line);
  color: var(--text-soft);
  font: 600 10px/1.5 var(--mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.use-story {
  padding: 110px 0;
  background: var(--ink);
  color: var(--paper);
}

.use-story-heading {
  display: grid;
  grid-template-columns: 0.75fr 1.25fr;
  gap: 70px;
  margin-bottom: 70px;
}

.use-story h2,
.reference-hero h1 {
  margin: 0;
  font-size: clamp(40px, 5vw, 72px);
  line-height: 1.02;
  letter-spacing: -0.05em;
}

.use-story-heading p {
  max-width: 620px;
  margin: 8px 0 0;
  color: #aeb5be;
  font-size: 19px;
  line-height: 1.6;
}

.journey {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border: 1px solid var(--light-line);
}

.journey-step {
  min-height: 310px;
  padding: 28px;
}

.journey-step + .journey-step {
  border-left: 1px solid var(--light-line);
}

.journey-number {
  display: block;
  margin-bottom: 100px;
  color: var(--green-bright);
  font: 700 11px/1 var(--mono);
}

.journey-step h3 {
  margin-bottom: 12px;
  font-size: 22px;
  line-height: 1.15;
}

.journey-step p {
  margin: 0;
  color: #aeb5be;
  font-size: 15px;
  line-height: 1.55;
}

.product-details {
  padding: 112px 0;
}

.product-details-grid {
  display: grid;
  grid-template-columns: minmax(280px, 0.75fr) minmax(0, 1.25fr);
  gap: 90px;
}

.product-details h2 {
  font-size: clamp(40px, 4.5vw, 64px);
  line-height: 1.03;
  letter-spacing: -0.045em;
}

.product-details .section-intro {
  font-size: 18px;
}

.product-list {
  border-top: 1px solid var(--line);
}

.product-list article {
  display: grid;
  grid-template-columns: 1fr;
  gap: 22px;
  padding: 27px 0;
  border-bottom: 1px solid var(--line);
}

.product-list article > span {
  color: var(--green);
  font: 700 11px/1.5 var(--mono);
}

.product-list h3 {
  margin-bottom: 8px;
  font-size: 21px;
}

.product-list p {
  margin: 0;
  color: var(--text-soft);
  font-size: 16px;
  line-height: 1.55;
}

.qr-usage {
  display: grid;
  grid-template-columns: 140px 1fr;
  align-items: center;
}

.qr-usage img {
  width: 110px;
  height: 110px;
  padding: 7px;
  background: #fff;
}

.reference-hero {
  padding: 110px 0 76px;
  border-bottom: 1px solid var(--line);
}

.reference-hero h1 {
  max-width: 950px;
}

.reference-status {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 24px;
  margin-top: 34px;
  color: var(--text-soft);
  font: 650 11px/1.5 var(--mono);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.reference-content {
  padding: 86px 0 110px;
}

.reference-qr {
  display: grid;
  grid-template-columns: 132px minmax(0, 1fr);
  gap: 30px;
  align-items: center;
}

.reference-qr > a {
  display: block;
  width: 132px;
}

.reference-qr img {
  display: block;
  width: 132px;
  height: 132px;
  padding: 8px;
  background: #fff;
}

.reference-qr h2 {
  margin-bottom: 10px;
}

.reference-qr p {
  margin: 0;
}

.reference-grid {
  display: grid;
  grid-template-columns: 180px minmax(0, 780px);
  gap: 72px;
  align-items: start;
}

.reference-aside {
  position: sticky;
  top: 110px;
  color: var(--green);
  font: 700 10px/1.6 var(--mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.reference-stack {
  border-top: 1px solid var(--line);
}

.reference-block {
  padding: 32px 0;
  border-bottom: 1px solid var(--line);
}

.reference-block h2 {
  margin-bottom: 14px;
  font-size: 26px;
}

.reference-block p,
.reference-block li {
  color: var(--text-soft);
  font-size: 17px;
  line-height: 1.65;
}

.reference-block p:last-child,
.reference-block ul:last-child {
  margin-bottom: 0;
}

.reference-block ul {
  margin: 0;
  padding-left: 22px;
}

.data-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.data-list li {
  display: grid;
  grid-template-columns: 190px 1fr;
  gap: 24px;
  padding: 12px 0;
  border-bottom: 1px solid rgba(25, 26, 22, 0.08);
}

.data-list strong {
  color: var(--text);
  font-family: var(--display);
}

.reference-links {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line);
}

.reference-links a {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
  font: 650 16px/1.4 var(--display);
  text-decoration: none;
}

.reference-links a::after {
  content: "↗";
  color: var(--green);
}

.subpage-footer {
  padding: 38px 0;
  background: var(--ink);
  color: #aeb5be;
}

.subpage-footer-inner {
  width: var(--page);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 32px;
  align-items: center;
}

.subpage-footer p {
  margin: 8px 0 0;
  font: 500 12px/1.5 var(--display);
}

@media (max-width: 900px) {
  .subpage-hero-grid,
  .use-story-heading,
  .product-details-grid,
  .reference-grid {
    grid-template-columns: 1fr;
  }

  .product-link-object {
    max-width: 520px;
  }

  .journey {
    grid-template-columns: 1fr 1fr;
  }

  .journey-step:nth-child(3) {
    border-left: 0;
  }

  .journey-step:nth-child(n + 3) {
    border-top: 1px solid var(--light-line);
  }

  .reference-grid {
    gap: 34px;
  }

  .reference-aside {
    position: static;
  }
}

@media (max-width: 680px) {
  .reference-qr {
    grid-template-columns: 96px minmax(0, 1fr);
    gap: 20px;
  }

  .reference-qr > a,
  .reference-qr img {
    width: 96px;
  }

  .reference-qr img {
    height: 96px;
    padding: 6px;
  }

  .subpage-header {
    padding: 0 20px;
  }

  .subpage-nav {
    gap: 12px;
  }

  .subpage-nav > a:not(.subpage-language) {
    display: none;
  }

  .subpage-hero,
  .reference-hero {
    padding: 82px 0 68px;
  }

  .subpage-hero h1,
  .reference-hero h1 {
    font-size: 44px;
  }

  .subpage-lead {
    font-size: 19px;
  }

  .subpage-actions {
    flex-direction: column;
  }

  .journey {
    grid-template-columns: 1fr;
  }

  .journey-step {
    min-height: 0;
  }

  .journey-step + .journey-step,
  .journey-step:nth-child(3) {
    border-top: 1px solid var(--light-line);
    border-left: 0;
  }

  .journey-number {
    margin-bottom: 52px;
  }

  .product-details,
  .use-story,
  .reference-content {
    padding: 78px 0;
  }

  .qr-usage {
    grid-template-columns: 92px 1fr;
  }

  .qr-usage img {
    width: 78px;
    height: 78px;
  }

  .data-list li {
    grid-template-columns: 1fr;
    gap: 4px;
  }

  .subpage-footer-inner {
    grid-template-columns: 1fr;
  }
}