:root {
  --bg: #05080a;
  --bg-soft: #090d10;
  --panel: #0d1114;
  --panel-strong: #12171b;
  --text: #f2f4f5;
  --muted: #b8bdc2;
  --dim: #7f8790;
  --line: rgba(210, 218, 226, 0.22);
  --line-soft: rgba(210, 218, 226, 0.12);
  --accent: #0f5fd7;
  --accent-soft: #4aa3ff;
  --green: #54d6a3;
  --paper: #d8d9d3;
  --paper-ink: #111417;
  --max-width: 1180px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background:
    linear-gradient(rgba(255, 255, 255, 0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.025) 1px, transparent 1px),
    radial-gradient(circle at 72% 10%, rgba(28, 72, 118, 0.22), transparent 28%),
    var(--bg);
  background-size: 48px 48px, 48px 48px, auto, auto;
  color: var(--text);
  font-family: "Public Sans", sans-serif;
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  max-width: 100%;
}

.app-shell {
  min-height: 100vh;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 70px;
  padding: 0 34px;
  background: rgba(3, 6, 8, 0.96);
  border-bottom: 1px solid var(--line-soft);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
}

.brand-mark {
  width: 34px;
  height: 34px;
  display: inline-flex;
}

.brand-mark img,
.brand-wordmark img,
.footer-left img,
.engine-signature img,
.fit-panel > img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.brand-wordmark,
.nav a,
.nav-cta,
.section-kicker,
.microcopy,
.passport-card span,
.field-row span,
.passport-footer,
.line-icon,
.process-panel span,
.engine-signature,
.fit-list span,
.footer {
  font-family: "Roboto Mono", monospace;
  text-transform: uppercase;
}

.brand-wordmark {
  width: 170px;
  height: 28px;
  display: inline-flex;
  filter: drop-shadow(0 0 14px rgba(255, 255, 255, 0.08));
}

.nav {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav a,
.nav-cta {
  color: var(--muted);
  font-size: 12px;
  letter-spacing: 0.1em;
}

.nav a.is-active,
.nav a:hover,
.nav-cta {
  color: var(--text);
}

.nav-cta {
  color: var(--accent-soft);
}

main {
  overflow: hidden;
}

[data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 520ms ease, transform 520ms ease;
}

[data-reveal].is-visible {
  opacity: 1;
  transform: translateY(0);
}

.hero-section {
  position: relative;
  border-bottom: 1px solid var(--line-soft);
  background:
    linear-gradient(90deg, rgba(5, 8, 10, 0.98), rgba(5, 8, 10, 0.86) 42%, rgba(5, 8, 10, 0.62)),
    linear-gradient(120deg, transparent 0, transparent 52%, rgba(255, 255, 255, 0.04) 52.2%, transparent 52.6%),
    var(--bg-soft);
}

.hero-section::after {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(90deg, rgba(74, 163, 255, 0.16), transparent 34%, transparent 66%, rgba(255, 255, 255, 0.06)),
    radial-gradient(circle at 78% 52%, rgba(255, 255, 255, 0.08), transparent 26%);
  opacity: 0.4;
  content: "";
}

.hero-inner {
  position: relative;
  z-index: 1;
  width: min(calc(100% - 64px), var(--max-width));
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(420px, 1.1fr);
  gap: 56px;
  align-items: center;
  min-height: 560px;
  padding: 56px 0;
}

.hero-copy,
.section-heading,
.artifact-copy,
.engine-copy,
.fit-copy,
.final-cta > div {
  display: grid;
  gap: 18px;
}

.section-kicker {
  margin: 0;
  color: var(--accent-soft);
  font-size: 12px;
  letter-spacing: 0.14em;
}

h1,
h2,
h3,
p {
  margin: 0;
}

h1,
h2,
h3 {
  font-weight: 800;
  text-transform: uppercase;
}

h1 {
  max-width: 590px;
  font-size: 58px;
  line-height: 0.95;
  letter-spacing: 0.035em;
}

h2 {
  max-width: 640px;
  font-size: 30px;
  line-height: 1.12;
  letter-spacing: 0.045em;
}

h3 {
  font-size: 15px;
  line-height: 1.2;
  letter-spacing: 0.06em;
}

p {
  max-width: 590px;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.65;
}

.hero-summary {
  max-width: 500px;
  padding-top: 18px;
  border-top: 1px solid var(--accent);
  color: var(--text);
}

.action-row {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 10px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 170px;
  min-height: 46px;
  padding: 0 22px;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--text);
  font-family: "Roboto Mono", monospace;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  transition: border-color 160ms ease, background 160ms ease;
}

.button::after {
  content: "->";
  margin-left: 14px;
  color: var(--accent-soft);
}

.button-primary {
  border-color: var(--accent);
  background: rgba(15, 95, 215, 0.72);
}

.button:hover {
  border-color: var(--accent-soft);
}

.specimen-preview {
  display: flex;
  justify-content: center;
}

.passport-card {
  position: relative;
  border: 1px solid var(--line);
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.04);
}

.passport-card-dark {
  width: min(100%, 540px);
  padding: 34px;
  background:
    linear-gradient(rgba(255, 255, 255, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.035) 1px, transparent 1px),
    #11161a;
  background-size: 32px 32px;
}

.passport-card-dark::before,
.passport-card-light::before {
  position: absolute;
  inset: 10px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  pointer-events: none;
  content: "";
}

.passport-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 24px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--line);
}

.passport-head div {
  display: grid;
  gap: 8px;
}

.passport-head strong {
  display: block;
  font-size: 24px;
  font-weight: 500;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

.passport-head img {
  width: 68px;
  height: 68px;
  object-fit: contain;
}

.microcopy,
.passport-card span,
.field-row span,
.passport-footer {
  color: var(--dim);
  font-size: 10px;
  letter-spacing: 0.09em;
}

.accent {
  color: var(--accent-soft);
}

.passport-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-left: 1px solid var(--line-soft);
}

.passport-grid div {
  display: grid;
  gap: 8px;
  min-height: 70px;
  padding: 16px;
  border-right: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
}

.passport-grid strong {
  font-size: 14px;
}

.section-band {
  width: min(calc(100% - 64px), var(--max-width));
  margin: 0 auto;
  padding: 44px 0;
}

.mechanism-band,
.problem-band,
.institutions-band {
  display: grid;
  gap: 34px;
}

.mechanism-band {
  border-bottom: 1px solid var(--line-soft);
}

.mechanism-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  border: 1px solid var(--line-soft);
  background:
    linear-gradient(90deg, rgba(74, 163, 255, 0.08), transparent 28%),
    rgba(13, 17, 20, 0.78);
}

.mechanism-grid article {
  min-height: 170px;
  padding: 24px 22px;
  border-right: 1px solid var(--line-soft);
}

.mechanism-grid article:last-child {
  border-right: 0;
}

.mechanism-grid h3 {
  margin-bottom: 14px;
}

.mechanism-grid p {
  font-size: 13px;
}

.problem-grid,
.audience-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  border-top: 1px solid var(--line-soft);
}

.problem-grid article,
.audience-grid article {
  min-height: 150px;
  padding: 24px 22px;
  border-right: 1px solid var(--line-soft);
}

.problem-grid article:last-child,
.audience-grid article:last-child {
  border-right: 0;
}

.line-icon {
  display: block;
  margin-bottom: 18px;
  color: var(--accent-soft);
  font-size: 12px;
  letter-spacing: 0.12em;
}

.problem-grid h3,
.audience-grid h3 {
  margin-bottom: 14px;
}

.problem-grid p,
.audience-grid p {
  font-size: 14px;
}

.artifact-band,
.engine-band,
.fit-band {
  display: grid;
  grid-template-columns: minmax(240px, 0.38fr) minmax(0, 1fr);
  gap: 42px;
  align-items: center;
  border-top: 1px solid var(--line-soft);
}

.artifact-note {
  display: grid;
  gap: 10px;
  margin-top: 42px;
  padding-top: 16px;
  border-top: 2px solid var(--accent);
}

.artifact-note span {
  color: var(--accent-soft);
  font-family: "Roboto Mono", monospace;
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.artifact-note p {
  font-size: 14px;
}

.passport-card-light {
  padding: 30px;
  background:
    linear-gradient(rgba(0, 0, 0, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 0, 0, 0.035) 1px, transparent 1px),
    var(--paper);
  background-size: 28px 28px;
  color: var(--paper-ink);
}

.passport-card-light::before {
  border-color: rgba(0, 0, 0, 0.16);
}

.passport-card-light .passport-head {
  border-bottom-color: rgba(0, 0, 0, 0.32);
}

.passport-card-light .passport-head strong {
  font-family: "Roboto Mono", monospace;
  font-weight: 700;
}

.passport-id {
  color: var(--paper-ink);
  font-weight: 700;
}

.passport-body {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: 32px;
  padding: 24px 0;
}

.passport-column {
  display: grid;
}

.passport-column-strong {
  border-left: 1px solid rgba(0, 0, 0, 0.24);
  padding-left: 28px;
}

.field-row {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  padding: 10px 0;
  border-bottom: 1px solid rgba(0, 0, 0, 0.2);
}

.field-row span {
  color: rgba(17, 20, 23, 0.64);
}

.field-row strong {
  text-align: right;
  font-size: 13px;
}

.passport-footer {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  padding-top: 16px;
  border-top: 1px solid rgba(0, 0, 0, 0.32);
  color: rgba(17, 20, 23, 0.68);
}

.engine-band {
  position: relative;
  align-items: stretch;
}

.engine-band::before {
  position: absolute;
  right: 6%;
  bottom: 18px;
  left: 36%;
  height: 1px;
  overflow: hidden;
  background: linear-gradient(90deg, transparent, rgba(74, 163, 255, 0.18), transparent);
  content: "";
}

.engine-band::after {
  position: absolute;
  bottom: 17px;
  left: 36%;
  width: 84px;
  height: 3px;
  background: linear-gradient(90deg, transparent, var(--accent-soft), transparent);
  filter: blur(0.4px);
  opacity: 0.74;
  animation: current-trace 5.8s linear infinite;
  content: "";
}

.engine-signature {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-top: 22px;
  color: var(--text);
  font-size: 13px;
  letter-spacing: 0.12em;
}

.engine-signature img {
  width: 24px;
  height: 24px;
}

.engine-signature strong {
  color: var(--accent-soft);
  font-size: 11px;
}

.process-panel {
  position: relative;
  overflow: hidden;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  border: 1px solid var(--line-soft);
  background: rgba(13, 17, 20, 0.84);
}

.process-panel::before {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(90deg, transparent 0 24%, rgba(74, 163, 255, 0.16) 24.2%, transparent 24.6%),
    linear-gradient(90deg, transparent 0 49%, rgba(74, 163, 255, 0.16) 49.2%, transparent 49.6%),
    linear-gradient(90deg, transparent 0 74%, rgba(74, 163, 255, 0.16) 74.2%, transparent 74.6%);
  opacity: 0.45;
  content: "";
}

.process-panel article {
  padding: 28px 24px;
  border-right: 1px solid var(--line-soft);
}

.process-panel article:last-child {
  border-right: 0;
}

.process-panel span {
  color: var(--accent-soft);
  font-size: 12px;
}

.process-panel h3 {
  margin: 16px 0 12px;
}

.process-panel p {
  font-size: 13px;
}

.audience-grid {
  grid-template-columns: repeat(5, minmax(0, 1fr));
}

.fit-panel {
  display: grid;
  grid-template-columns: minmax(180px, 0.48fr) minmax(0, 1fr) 120px;
  gap: 28px;
  align-items: center;
  padding: 24px;
  border: 1px solid var(--line-soft);
  background: rgba(13, 17, 20, 0.84);
}

.fit-image {
  position: relative;
  overflow: hidden;
  min-height: 180px;
  background:
    radial-gradient(circle at 50% 34%, rgba(74, 163, 255, 0.16), transparent 20%),
    linear-gradient(rgba(255, 255, 255, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.035) 1px, transparent 1px),
    #080b0d;
  background-size: auto, 24px 24px, 24px 24px, auto;
  border: 1px solid var(--line-soft);
}

.fit-image::before {
  position: absolute;
  top: 26px;
  right: 28px;
  bottom: 26px;
  left: 28px;
  background:
    linear-gradient(90deg, transparent 0 18%, rgba(210, 218, 226, 0.32) 18% 19%, transparent 19% 42%, rgba(210, 218, 226, 0.32) 42% 43%, transparent 43%),
    linear-gradient(rgba(210, 218, 226, 0.32), rgba(210, 218, 226, 0.32)) 18% 22% / 1px 64% no-repeat,
    linear-gradient(rgba(210, 218, 226, 0.32), rgba(210, 218, 226, 0.32)) 42% 22% / 1px 64% no-repeat,
    linear-gradient(90deg, rgba(210, 218, 226, 0.32), rgba(210, 218, 226, 0.32)) 0 50% / 100% 1px no-repeat,
    radial-gradient(circle, var(--accent-soft) 0 3px, transparent 3.5px) 18% 50% / 10px 10px no-repeat,
    radial-gradient(circle, var(--accent-soft) 0 3px, transparent 3.5px) 42% 50% / 10px 10px no-repeat,
    radial-gradient(circle, var(--accent-soft) 0 3px, transparent 3.5px) 74% 50% / 10px 10px no-repeat;
  opacity: 0.7;
  content: "";
}

.fit-image::after {
  position: absolute;
  top: calc(50% - 1px);
  left: 28px;
  width: 58px;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--accent-soft), transparent);
  opacity: 0.8;
  animation: conduit-pulse 4.8s ease-in-out infinite;
  content: "";
}

.fit-list {
  display: grid;
  gap: 18px;
}

.fit-list div {
  padding-left: 16px;
  border-left: 2px solid var(--accent);
}

.fit-list span {
  color: var(--accent-soft);
  font-size: 12px;
  letter-spacing: 0.1em;
}

.fit-list p {
  margin-top: 6px;
  font-size: 13px;
}

.fit-panel > img {
  width: 112px;
  height: 112px;
}

.final-cta {
  width: min(calc(100% - 64px), var(--max-width));
  margin: 10px auto 42px;
  padding: 30px 34px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 30px;
  border: 1px solid var(--line-soft);
  background:
    linear-gradient(120deg, rgba(255, 255, 255, 0.035), transparent 42%),
    rgba(13, 17, 20, 0.92);
}

.final-cta h2 {
  font-size: 28px;
}

.final-cta p {
  font-size: 14px;
}

.footer {
  min-height: 54px;
  padding: 0 34px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  border-left: 0;
  border-right: 0;
  background: #040608;
  color: var(--dim);
  font-size: 11px;
  letter-spacing: 0.12em;
}

.footer-left,
.footer-right,
.u27-provenance {
  display: inline-flex;
  align-items: center;
  gap: 18px;
}

.u27-provenance {
  color: rgba(184, 189, 194, 0.72);
  font-family: "Roboto Mono", monospace;
  font-size: 10px;
  letter-spacing: 0.11em;
  text-transform: uppercase;
}

.u27-provenance::before {
  width: 28px;
  height: 1px;
  background: var(--accent);
  content: "";
}

.u27-provenance:hover {
  color: var(--accent-soft);
}

.footer-left img {
  width: 22px;
  height: 22px;
}

.footer-left .footer-wordmark {
  width: 92px;
  height: 18px;
}

@keyframes current-trace {
  0% {
    transform: translateX(0);
    opacity: 0;
  }

  12%,
  78% {
    opacity: 0.74;
  }

  100% {
    transform: translateX(520px);
    opacity: 0;
  }
}

@keyframes conduit-pulse {
  0% {
    transform: translateX(0);
    opacity: 0;
  }

  18%,
  72% {
    opacity: 0.78;
  }

  100% {
    transform: translateX(76%);
    opacity: 0;
  }
}

.page-frame {
  width: min(calc(100% - 64px), var(--max-width));
  margin: 0 auto;
  padding: 48px 0;
}

.page-hero {
  max-width: 760px;
  margin-bottom: 28px;
}

.page-hero p {
  margin-top: 18px;
}

.architecture-panel,
.brief-grid,
.stats-grid {
  display: grid;
  gap: 0;
  border: 1px solid var(--line-soft);
  background: rgba(13, 17, 20, 0.88);
}

.architecture-panel {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-bottom: 28px;
}

.architecture-column,
.brief-card,
.stat-cell {
  padding: 26px;
  border-right: 1px solid var(--line-soft);
}

.architecture-column:last-child,
.brief-card:nth-child(2n),
.stat-cell:last-child {
  border-right: 0;
}

.architecture-column .stat-label,
.brief-card .stat-label,
.stat-cell .stat-label {
  color: var(--accent-soft);
  font-family: "Roboto Mono", monospace;
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.module-list.compact {
  margin-top: 20px;
  margin-bottom: 0;
}

.two-up-grid,
.brief-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 28px;
}

.module-card,
.brief-card,
.telemetry-panel {
  padding: 28px;
  border: 1px solid var(--line-soft);
  background: rgba(13, 17, 20, 0.88);
}

.module-head {
  display: flex;
  align-items: center;
  gap: 12px;
  padding-bottom: 16px;
  margin-bottom: 20px;
  border-bottom: 1px solid var(--line-soft);
}

.status-pip {
  display: inline-block;
  width: 10px;
  height: 10px;
  background: var(--accent);
}

.module-list {
  display: grid;
  gap: 12px;
  margin: 0 0 24px;
  padding: 0;
  list-style: none;
  color: var(--muted);
  font-family: "Roboto Mono", monospace;
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.module-list li {
  position: relative;
  padding-left: 14px;
}

.module-list li::before {
  position: absolute;
  top: 7px;
  left: 0;
  width: 5px;
  height: 5px;
  background: var(--accent);
  content: "";
}

.submodule {
  border: 1px solid var(--line-soft);
  padding: 14px;
}

.submodule-row {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  padding: 10px 0;
  border-bottom: 1px solid var(--line-soft);
  color: var(--muted);
  font-family: "Roboto Mono", monospace;
  font-size: 12px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.submodule-row:last-child {
  border-bottom: 0;
}

.graph-box {
  border: 1px solid var(--line-soft);
  padding: 18px;
}

.graph-label {
  color: var(--dim);
  font-family: "Roboto Mono", monospace;
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.graph-box svg {
  width: 100%;
  height: 90px;
  margin-top: 12px;
}

.graph-box polyline {
  fill: none;
  stroke: var(--accent-soft);
  stroke-width: 1.2;
}

.brief-card {
  display: grid;
  gap: 14px;
}

.telemetry-panel {
  margin-top: 28px;
}

.stats-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.stat-cell strong {
  display: block;
  margin-top: 18px;
  color: var(--text);
  font-size: 32px;
  line-height: 1;
  text-transform: uppercase;
}

.stat-meta {
  display: inline-flex;
  gap: 8px;
  align-items: center;
  margin-top: 16px;
  color: var(--muted);
  font-family: "Roboto Mono", monospace;
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

@media (max-width: 1100px) {
  .hero-inner,
  .artifact-band,
  .engine-band,
  .fit-band,
  .process-panel,
  .audience-grid,
  .architecture-panel,
  .stats-grid {
    grid-template-columns: 1fr;
  }

  .problem-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .mechanism-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .artifact-copy,
  .engine-copy,
  .fit-copy {
    max-width: 720px;
  }

  .process-panel article,
  .mechanism-grid article,
  .problem-grid article,
  .audience-grid article,
  .architecture-column,
  .stat-cell {
    border-right: 0;
    border-bottom: 1px solid var(--line-soft);
  }

  .process-panel article:last-child,
  .mechanism-grid article:nth-last-child(-n + 2),
  .problem-grid article:nth-last-child(-n + 2),
  .audience-grid article:last-child,
  .architecture-column:last-child,
  .stat-cell:last-child {
    border-bottom: 0;
  }
}

@media (max-width: 760px) {
  .topbar {
    align-items: flex-start;
    flex-direction: column;
    gap: 13px;
    min-height: auto;
    padding: 14px 18px;
  }

  .nav {
    flex-wrap: wrap;
    gap: 16px;
  }

  .nav a {
    font-size: 11px;
  }

  .nav-cta {
    display: none;
  }

  .brand {
    gap: 10px;
  }

  .brand-mark {
    width: 30px;
    height: 30px;
  }

  .brand-wordmark {
    width: 152px;
    height: 25px;
  }

  .hero-inner,
  .section-band,
  .final-cta,
  .page-frame {
    width: min(calc(100% - 28px), var(--max-width));
  }

  .hero-inner {
    min-height: auto;
    gap: 28px;
    padding: 34px 0;
  }

  h1 {
    font-size: clamp(36px, 12vw, 46px);
  }

  h2 {
    font-size: 26px;
  }

  .passport-body,
  .mechanism-grid,
  .problem-grid,
  .brief-grid,
  .two-up-grid,
  .fit-panel {
    grid-template-columns: 1fr;
  }

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

  .passport-card-dark,
  .passport-card-light {
    padding: 22px;
  }

  .passport-head {
    align-items: flex-start;
    flex-direction: column-reverse;
    gap: 16px;
  }

  .passport-head strong {
    font-size: 21px;
  }

  .passport-head img {
    width: 54px;
    height: 54px;
  }

  .field-row {
    align-items: flex-start;
    flex-direction: column;
    gap: 6px;
  }

  .field-row strong {
    text-align: left;
  }

  .passport-column-strong {
    border-left: 0;
    padding-left: 0;
  }

  .problem-grid article:nth-last-child(-n + 2) {
    border-bottom: 1px solid var(--line-soft);
  }

  .mechanism-grid article:nth-last-child(-n + 2) {
    border-bottom: 1px solid var(--line-soft);
  }

  .mechanism-grid article:last-child,
  .problem-grid article:last-child {
    border-bottom: 0;
  }

  .final-cta,
  .footer {
    align-items: flex-start;
    flex-direction: column;
  }
}

@media (max-width: 520px) {
  body {
    background-size: 36px 36px, 36px 36px, auto, auto;
  }

  .topbar {
    gap: 11px;
    padding: 12px 14px;
  }

  .brand-mark {
    width: 26px;
    height: 26px;
  }

  .brand-wordmark {
    width: 122px;
    height: 22px;
  }

  .nav {
    width: 100%;
    justify-content: space-between;
    gap: 8px;
  }

  .nav a {
    font-size: 10px;
    letter-spacing: 0.07em;
  }

  .hero-inner,
  .section-band,
  .final-cta,
  .page-frame {
    width: min(calc(100% - 28px), var(--max-width));
  }

  .hero-inner {
    padding: 30px 0 34px;
  }

  .section-band {
    padding: 36px 0;
  }

  .section-kicker,
  .line-icon,
  .process-panel span,
  .fit-list span {
    font-size: 10px;
  }

  h1 {
    font-size: clamp(34px, 11vw, 42px);
    letter-spacing: 0.015em;
  }

  h2 {
    font-size: 25px;
  }

  p,
  .hero-summary {
    font-size: 15px;
    line-height: 1.58;
  }

  .action-row,
  .button {
    width: 100%;
  }

  .button {
    min-width: 0;
  }

  .problem-grid article,
  .mechanism-grid article,
  .audience-grid article,
  .process-panel article,
  .module-card,
  .brief-card,
  .telemetry-panel {
    padding: 22px;
  }

  .passport-card-dark,
  .passport-card-light {
    padding: 20px;
  }

  .passport-head strong {
    font-size: 19px;
    line-height: 1.2;
  }

  .passport-grid div {
    min-height: auto;
    padding: 14px;
  }

  .passport-body {
    gap: 18px;
  }

  .passport-footer {
    flex-direction: column;
    gap: 10px;
  }

  .fit-panel {
    padding: 20px;
  }

  .fit-panel > img {
    width: 88px;
    height: 88px;
  }

  .final-cta {
    padding: 26px 24px;
  }

  .footer {
    gap: 18px;
    padding: 18px;
  }

  .footer-left,
  .footer-right,
  .u27-provenance {
    align-items: flex-start;
    flex-wrap: wrap;
    gap: 10px 14px;
  }

  .footer-right span {
    max-width: 130px;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .engine-band::after,
  .fit-image::after {
    animation: none;
  }
}