@font-face {
  font-family: "Newsreader";
  src: url("./fonts/newsreader-roman-latin.woff2") format("woff2");
  font-style: normal;
  font-weight: 300 700;
  font-display: swap;
}

@font-face {
  font-family: "Newsreader";
  src: url("./fonts/newsreader-italic-300-latin.woff2") format("woff2");
  font-style: italic;
  font-weight: 300;
  font-display: swap;
}

@font-face {
  font-family: "Instrument Sans";
  src: url("./fonts/instrument-sans-latin.woff2") format("woff2");
  font-style: normal;
  font-weight: 400 700;
  font-display: swap;
}

@font-face {
  font-family: "IBM Plex Mono";
  src: url("./fonts/ibm-plex-mono-400-latin.woff2") format("woff2");
  font-style: normal;
  font-weight: 400;
  font-display: swap;
}

@font-face {
  font-family: "IBM Plex Mono";
  src: url("./fonts/ibm-plex-mono-500-latin.woff2") format("woff2");
  font-style: normal;
  font-weight: 500;
  font-display: swap;
}

:root {
  color-scheme: light;
  --ink: #111412;
  --ivory: #f4f1e9;
  --body: #2a2e28;
  --moss: #526257;
  --line: #84887e;
  --meta: #3d423c;
  --soft: #c9c3b4;
  --drawer: #ece8dc;
  --bronze: #7a5c36;
  --focus: #ffcf4a;
  --serif: "Newsreader", Georgia, "Times New Roman", serif;
  --sans: "Instrument Sans", Arial, Helvetica, sans-serif;
  --mono: "IBM Plex Mono", "SFMono-Regular", Consolas, monospace;
  font-family: var(--sans);
  background: var(--ivory);
  color: var(--ink);
  font-synthesis: none;
}

*,
*::before,
*::after {
  box-sizing: border-box;
  border-radius: 0;
}

html {
  min-width: 320px;
  scroll-behavior: smooth;
  background: var(--ivory);
}

body {
  min-width: 320px;
  margin: 0;
  overflow-wrap: break-word;
  background: var(--ivory);
  color: var(--body);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

body,
button,
input,
select,
textarea {
  font-family: var(--sans);
}

button,
input,
select,
textarea {
  font-size: 16px;
}

a {
  color: inherit;
  text-decoration-thickness: 1px;
  text-underline-offset: 4px;
}

a:hover {
  color: var(--moss);
}

a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible,
[tabindex]:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
  box-shadow: 0 0 0 6px var(--ink);
}

button {
  cursor: pointer;
}

button:disabled {
  cursor: not-allowed;
}

[hidden],
.status-note {
  display: none !important;
}

.skip-link {
  position: fixed;
  z-index: 1000;
  top: 8px;
  left: 8px;
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  padding: 0 18px;
  transform: translateY(-180%);
  background: var(--ink);
  color: var(--ivory);
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
}

.skip-link:focus,
.skip-link:focus-visible {
  transform: none;
  color: var(--ivory);
}

.site-header {
  position: relative;
  z-index: 40;
  display: flex;
  min-height: 61px;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 8px 56px;
  border-bottom: 1px solid var(--line);
  background: var(--ivory);
}

.brand {
  display: inline-flex;
  width: fit-content;
  min-height: 44px;
  align-items: center;
  color: var(--ink);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-decoration: none;
  text-transform: uppercase;
}

.brand:hover {
  color: var(--ink);
}

.menu-button {
  display: none;
  min-width: 44px;
  min-height: 44px;
  padding: 0 12px;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--ink);
  font-size: 13px;
  font-weight: 600;
}

.primary-nav ul {
  display: flex;
  align-items: center;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.primary-nav a {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  padding: 0 12px;
  color: var(--ink);
  font-size: 14px;
  font-weight: 400;
  text-decoration: none;
}

.primary-nav a:hover {
  color: var(--ink);
  text-decoration: underline;
}

.primary-nav a[aria-current="page"] {
  box-shadow: inset 0 -2px 0 var(--moss);
  font-weight: 500;
}

main:focus {
  outline: none;
}

h1,
h2,
h3 {
  margin-block: 0;
  color: var(--ink);
  font-family: var(--serif);
  font-weight: 300;
}

h1 {
  font-size: clamp(48px, 5.2vw, 76px);
  line-height: 1.04;
  letter-spacing: -0.012em;
}

h2 {
  font-size: clamp(30px, 3vw, 42px);
  line-height: 1.16;
}

h3 {
  font-size: clamp(23px, 2vw, 31px);
  line-height: 1.2;
}

p {
  margin-block: 0;
}

.section-label {
  margin: 0 0 18px;
  color: var(--moss);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.16em;
  line-height: 1.4;
  text-transform: uppercase;
}

.section-label,
.gate-code,
.scenario-note,
.privacy-number {
  font-variant-numeric: tabular-nums;
}

.site-footer {
  display: flex;
  min-height: 64px;
  align-items: center;
  gap: 10px;
  padding: 10px 56px;
  border-top: 1px solid var(--line);
  background: var(--ivory);
  color: var(--meta);
  font-size: 13px;
}

.site-footer a,
.site-footer span {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
}

.site-footer a {
  min-width: 44px;
  padding-inline: 4px;
  color: var(--ink);
}

/* Home: editorial opening, then one continuous origin-to-proof spine. */
.home-intro {
  display: block;
  padding: 104px 120px 88px 160px;
}

.home-intro h1 {
  max-width: 750px;
  font-size: clamp(56px, 5vw, 68px);
}

.home-intro-copy {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(280px, 0.65fr);
  column-gap: 64px;
  row-gap: 26px;
  align-items: end;
  max-width: none;
}

.home-category {
  grid-column: 1 / -1;
  color: var(--moss);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.12em;
  line-height: 1.45;
  text-transform: uppercase;
}

.home-intro-copy .home-summary {
  color: var(--body);
  font-size: 15.5px;
  line-height: 1.65;
}

.inline-link {
  display: inline-flex;
  width: fit-content;
  min-height: 44px;
  align-items: center;
  color: var(--ink);
  font-size: 14px;
  font-weight: 500;
}

.spine-section {
  position: relative;
  padding: 72px 160px 76px 220px;
}

.spine-section::before {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 119px;
  width: 2px;
  background: var(--moss);
  content: "";
}

.spine-node {
  position: absolute;
  z-index: 2;
  top: 68px;
  left: 111px;
  display: flex;
  width: 18px;
  height: 18px;
  align-items: center;
  justify-content: center;
  background: var(--ink);
  color: var(--ivory);
  font-size: 12px;
  font-weight: 600;
  line-height: 1;
}

.brief-origin {
  padding-block: 76px;
}

.brief-origin .spine-node {
  top: 72px;
}

.brief-origin h2 {
  max-width: 820px;
  font-size: clamp(32px, 3vw, 38px);
  line-height: 1.18;
}

.brief-origin .category-intro {
  max-width: 760px;
  margin-top: 24px;
  color: var(--body);
  font-size: 16px;
  line-height: 1.7;
}

.capability-register {
  max-width: 940px;
}

.capability-section > h2 {
  max-width: 820px;
  margin-bottom: 34px;
  font-size: 32px;
  line-height: 1.2;
}

.capability-row {
  position: relative;
  display: grid;
  grid-template-columns: minmax(230px, 340px) minmax(0, 1fr);
  gap: 40px;
  align-items: baseline;
  padding: 28px 0 30px;
  border-top: 1px solid var(--line);
  color: var(--body);
  font-size: 15px;
  line-height: 1.6;
}

.capability-row:last-child {
  border-bottom: 1px solid var(--line);
}

.capability-row:nth-child(2) {
  padding-left: min(10vw, 150px);
}

.capability-row:nth-child(3) {
  padding-left: min(4.5vw, 64px);
}

.capability-row::before {
  position: absolute;
  top: 40px;
  left: -106px;
  width: 10px;
  height: 10px;
  background: var(--ink);
  content: "";
}

.capability-row h2,
.capability-row h3,
.capability-row strong {
  color: var(--ink);
  font-family: var(--serif);
  font-size: 32px;
  font-weight: 400;
  line-height: 1.1;
}

.capability-row p {
  max-width: 480px;
  color: var(--body);
  font-size: 15px;
  line-height: 1.6;
}

.shared-responsibility {
  padding-block: 64px 72px;
}

.shared-responsibility::before,
.shared-responsibility::after {
  left: 115px;
  width: 1px;
}

.shared-responsibility::after {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 124px;
  background: var(--moss);
  content: "";
}

.responsibility-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 72px;
  align-items: start;
  max-width: 960px;
}

.responsibility-grid > :first-child {
  color: var(--ink);
  font-family: var(--serif);
  font-size: 30px;
  font-weight: 300;
  line-height: 1.25;
}

.responsibility-grid > :last-child {
  max-width: 460px;
  padding-top: 6px;
  color: var(--body);
  font-size: 16px;
  line-height: 1.7;
}

.gates-section {
  padding-block: 24px 76px;
}

.gates-section > h2 {
  max-width: 760px;
  margin-bottom: 28px;
  font-size: 32px;
  line-height: 1.2;
}

.gate-register {
  max-width: 860px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.gate-row {
  position: relative;
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 18px;
  align-items: baseline;
  padding: 18px 0 19px;
  border-top: 1px solid var(--line);
}

.gate-row:last-child {
  border-bottom: 1px solid var(--line);
}

.gate-row::before {
  position: absolute;
  top: 25px;
  left: -106px;
  width: 12px;
  height: 12px;
  background: var(--moss);
  content: "";
}

.gate-code {
  color: var(--moss);
  font-family: var(--mono);
  font-size: 15px;
  font-weight: 500;
}

.gate-copy {
  color: var(--ink);
  font-size: 17px;
  font-weight: 600;
}

.scenario-note {
  max-width: 860px;
  margin-top: 18px;
  color: var(--meta);
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.8;
}

.confidence-note {
  max-width: 640px;
  margin-top: 40px;
  color: var(--body);
  font-size: 16px;
  line-height: 1.7;
}

.cta-terminus {
  position: relative;
  padding: 68px 160px 68px 220px;
  background: var(--ink);
  color: var(--ivory);
}

.cta-terminus::before {
  position: absolute;
  top: 0;
  left: 119px;
  width: 2px;
  height: 66px;
  background: var(--moss);
  content: "";
}

.cta-terminus::after {
  position: absolute;
  top: 66px;
  left: 112px;
  width: 16px;
  height: 5px;
  background: var(--ivory);
  content: "";
}

.cta-terminus h2 {
  max-width: 760px;
  color: var(--ivory);
  font-size: 36px;
  line-height: 1.2;
}

.cta-terminus .button-link {
  margin-top: 26px;
}

.button-link {
  display: inline-flex;
  width: fit-content;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  padding: 0 28px;
  border: 1px solid var(--ink);
  background: var(--ink);
  color: var(--ivory);
  font-size: 15px;
  font-weight: 500;
  text-decoration: none;
}

.button-link:hover {
  background: var(--moss);
  color: var(--ivory);
}

.dark-section .button-link,
.cta-terminus .button-link,
.email-terminus .button-link {
  border-color: var(--ivory);
  background: var(--ivory);
  color: var(--ink);
}

.dark-section .button-link:hover,
.cta-terminus .button-link:hover,
.email-terminus .button-link:hover {
  border-color: var(--soft);
  background: var(--soft);
  color: var(--ink);
}

/* Technology Platforms: a mechanism register, not a card grid. */
.page-intro {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(300px, 0.85fr);
  gap: 80px;
  align-items: end;
  padding: 92px 120px 76px 160px;
  border-bottom: 1px solid var(--line);
}

.page-intro h1 {
  max-width: 790px;
  font-size: clamp(52px, 4.5vw, 64px);
}

.page-intro > p,
.page-intro > div > p {
  max-width: 470px;
  color: var(--body);
  font-size: 16px;
  line-height: 1.7;
}

.selection-boundary {
  align-self: stretch;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  gap: 14px;
  padding: 24px 0 4px 32px;
  border-left: 1px solid var(--line);
}

.selection-boundary p {
  max-width: 420px;
  color: var(--meta);
  font-size: 14px;
  line-height: 1.65;
}

.mechanism-section {
  position: relative;
  padding: 72px 160px 88px 220px;
}

.mechanism-section::before,
.brief-section::before {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 119px;
  width: 2px;
  background: var(--moss);
  content: "";
}

.mechanism-register {
  max-width: 980px;
  margin: 30px 0 0;
  padding: 0;
  list-style: none;
}

.mechanism-row {
  position: relative;
  display: grid;
  grid-template-columns: minmax(220px, 0.72fr) minmax(0, 1fr);
  gap: 28px;
  align-items: start;
  padding: 30px 0 32px;
  border-top: 1px solid var(--line);
}

.mechanism-row:last-child {
  border-bottom: 1px solid var(--line);
}

.mechanism-row::before {
  position: absolute;
  top: 38px;
  left: -106px;
  width: 10px;
  height: 10px;
  background: var(--ink);
  content: "";
}

.mechanism-row h2,
.mechanism-row h3,
.mechanism-row strong {
  color: var(--ink);
  font-family: var(--serif);
  font-size: 29px;
  font-weight: 400;
  line-height: 1.14;
}

.mechanism-row p {
  max-width: 500px;
  color: var(--body);
  font-size: 15px;
  line-height: 1.65;
}

.solution-section {
  position: relative;
  display: grid;
  grid-template-columns: minmax(260px, 0.8fr) minmax(0, 1.2fr);
  column-gap: 80px;
  row-gap: 24px;
  padding: 72px 160px 76px 220px;
}

.dark-section {
  background: var(--ink);
  color: var(--ivory);
}

.solution-section::before {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 119px;
  width: 2px;
  background: var(--moss);
  content: "";
}

.solution-section::after {
  position: absolute;
  top: 72px;
  left: 112px;
  width: 16px;
  height: 5px;
  background: var(--ivory);
  content: "";
}

.solution-section .section-label {
  grid-column: 1 / -1;
  margin-bottom: 0;
  color: var(--soft);
}

.dark-section h2,
.dark-section h3 {
  color: var(--ivory);
}

.solution-section h2 {
  font-size: 38px;
  line-height: 1.16;
}

.solution-section p {
  max-width: 570px;
  color: var(--ivory);
  font-size: 16px;
  line-height: 1.7;
}

.brief-section {
  position: relative;
  padding: 76px 160px 88px 220px;
}

.brief-section > p:not(.section-label) {
  max-width: 760px;
  color: var(--body);
  font-size: 22px;
  line-height: 1.5;
}

.compact-gates {
  max-width: 860px;
  margin-top: 42px;
}

.compact-gates .gate-row::before {
  left: -106px;
}

.platform-cta {
  position: relative;
  padding: 64px 160px 64px 220px;
  border-top: 1px solid var(--line);
}

.platform-cta::before {
  bottom: auto;
  height: 58px;
}

.platform-cta .line-terminus {
  position: absolute;
  top: 58px;
  left: 112px;
  width: 16px;
  height: 5px;
  background: var(--ink);
}

.platform-cta h2 {
  max-width: 760px;
  font-size: 34px;
}

.platform-cta .button-link,
.platform-cta .inline-link {
  margin-top: 24px;
}

/* Start: a deliberately plain brief sheet resolving to direct contact. */
.start-intro {
  display: block;
  padding: 88px 160px 64px 400px;
}

.start-intro h1 {
  max-width: 720px;
  margin-bottom: 26px;
  font-size: 56px;
  line-height: 1.05;
}

.start-intro p {
  max-width: 720px;
  margin-bottom: 10px;
  color: var(--body);
  font-size: 17px;
  line-height: 1.7;
}

.start-intro p:last-child {
  margin-bottom: 0;
}

.brief-sheet-section {
  position: relative;
  padding: 32px 160px 56px 400px;
}

.brief-sheet-section::before {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 299px;
  width: 2px;
  background: var(--moss);
  content: "";
}

.brief-sheet-section .spine-node {
  top: 28px;
  left: 291px;
}

.brief-sheet {
  display: block;
  max-width: 760px;
  padding: 40px 48px 44px;
  border: 1px solid var(--line);
  background: #f8f6ef;
}

.brief-sheet h2 {
  margin-bottom: 8px;
  font-size: 26px;
}

.brief-sheet ol,
.brief-sheet ul {
  margin: 16px 0 0;
  padding: 0;
  list-style: decimal-leading-zero inside;
}

.brief-sheet li {
  padding: 15px 4px;
  border-top: 1px solid var(--soft);
  color: var(--body);
  font-size: 16px;
  line-height: 1.55;
}

.brief-sheet li:last-child {
  border-bottom: 1px solid var(--soft);
}

.email-terminus {
  position: relative;
  display: block;
  padding: 24px 160px 88px 400px;
  background: var(--ivory);
  color: var(--body);
}

.email-terminus::before {
  position: absolute;
  top: 0;
  left: 299px;
  width: 2px;
  height: 120px;
  background: var(--moss);
  content: "";
}

.email-terminus::after {
  position: absolute;
  top: 120px;
  left: 292px;
  width: 16px;
  height: 5px;
  background: var(--ink);
  content: "";
}

.email-terminus .section-label,
.cta-terminus .section-label {
  color: var(--moss);
}

.email-terminus p {
  max-width: 680px;
  margin-top: 18px;
  color: var(--body);
}

.email-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 28px;
  align-items: center;
}

.email-actions a:not(.button-link) {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  color: var(--ink);
}

.copy-email-button {
  margin: 0;
  appearance: none;
  line-height: inherit;
}

.email-address {
  margin-bottom: 0;
  color: var(--ink);
  font-family: var(--mono);
  font-size: 15px;
}

.email-copy-help,
.email-copy-status {
  margin-top: 8px;
  color: var(--meta);
  font-size: 13px;
  line-height: 1.55;
}

.email-copy-status:empty {
  min-height: 0;
  margin-top: 0;
}

.email-terminus .button-link {
  border-color: var(--ink);
  background: var(--ink);
  color: var(--ivory);
}

.email-terminus .button-link:hover {
  border-color: var(--moss);
  background: var(--moss);
  color: var(--ivory);
}

.email-terminus .button-link:disabled {
  border-color: var(--line);
  background: var(--line);
  color: var(--ink);
}

/* Privacy: indexed editorial clauses rather than a generic policy page. */
.privacy-intro {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(300px, 0.62fr);
  gap: 86px;
  align-items: end;
  padding: 88px 120px 68px 160px;
  border-bottom: 1px solid var(--line);
}

.privacy-intro h1 {
  font-size: clamp(54px, 4.8vw, 68px);
}

.privacy-intro p {
  max-width: 470px;
  color: var(--body);
  font-size: 16px;
  line-height: 1.7;
}

.privacy-note {
  max-width: none;
  margin: 0;
  padding: 24px 26px;
  border: 1px solid var(--line);
  color: var(--meta);
  font-size: 14px;
  line-height: 1.65;
}

.privacy-layout {
  display: grid;
  grid-template-columns: minmax(190px, 250px) minmax(0, 1fr);
  gap: clamp(56px, 8vw, 120px);
  max-width: 1240px;
  margin-inline: auto;
  padding: 72px 40px 112px;
}

.privacy-nav {
  position: sticky;
  top: 24px;
  align-self: start;
  border-top: 1px solid var(--line);
}

.privacy-nav ol,
.privacy-nav ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.privacy-nav a {
  display: flex;
  min-height: 44px;
  align-items: center;
  padding: 8px 0;
  border-bottom: 1px solid var(--soft);
  color: var(--meta);
  font-size: 13px;
  text-decoration: none;
}

.privacy-nav a:hover {
  color: var(--ink);
  text-decoration: underline;
}

.privacy-copy {
  min-width: 0;
}

.privacy-copy > section,
.privacy-copy > article {
  display: grid;
  grid-template-columns: 72px minmax(0, 1fr);
  gap: 30px;
  padding: 0 0 54px;
  margin-bottom: 54px;
  border-bottom: 1px solid var(--line);
  scroll-margin-top: 24px;
}

.privacy-number {
  color: var(--bronze);
  font-family: var(--serif);
  font-size: 40px;
  font-weight: 300;
  line-height: 1;
}

.privacy-copy h2 {
  font-size: 31px;
  line-height: 1.2;
}

.privacy-copy p,
.privacy-copy li {
  max-width: 710px;
  color: var(--body);
  font-size: 15px;
  line-height: 1.75;
}

.privacy-copy h2 + p,
.privacy-copy h2 + ul,
.privacy-copy h2 + ol,
.privacy-copy p + p {
  margin-top: 18px;
}

.privacy-copy ul,
.privacy-copy ol {
  margin-bottom: 0;
  padding-left: 1.3em;
}

.privacy-copy li + li {
  margin-top: 8px;
}

.not-found {
  min-height: calc(100vh - 126px);
  display: grid;
  align-content: center;
  gap: 28px;
  padding: 88px clamp(24px, 10vw, 160px);
}

.not-found h1 {
  max-width: 850px;
}

.not-found p {
  max-width: 620px;
}

@media (max-width: 959px) {
  .site-header {
    padding-inline: 28px;
  }

  .menu-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

  .primary-nav {
    position: absolute;
    top: 100%;
    right: 0;
    left: 0;
    z-index: 50;
    border-bottom: 1px solid var(--line);
    background: var(--drawer);
  }

  .primary-nav ul {
    display: block;
  }

  .primary-nav a {
    display: flex;
    min-height: 48px;
    padding: 0 28px;
    border-top: 1px solid var(--soft);
    font-size: 15px;
  }

  .primary-nav li:first-child a {
    border-top: 0;
  }

  .primary-nav a[aria-current="page"] {
    box-shadow: inset 3px 0 0 var(--moss);
    font-weight: 600;
  }

  .site-footer {
    flex-wrap: wrap;
    padding-inline: 28px;
  }

  .home-intro,
  .page-intro,
  .start-intro,
  .privacy-intro {
    grid-template-columns: minmax(0, 1fr);
    gap: 40px;
    padding: 72px 72px 64px;
  }

  .home-intro-copy,
  .page-intro > p,
  .start-intro p,
  .privacy-intro p {
    max-width: 620px;
  }

  .home-intro-copy {
    grid-template-columns: minmax(0, 1fr);
    gap: 28px;
    max-width: none;
  }

  .start-intro {
    row-gap: 14px;
  }

  .start-intro h1,
  .start-intro > p {
    grid-row: auto;
    grid-column: auto;
  }

  .spine-section,
  .mechanism-section,
  .brief-section,
  .brief-sheet-section {
    padding-right: 72px;
    padding-left: 112px;
  }

  .spine-section::before,
  .mechanism-section::before,
  .brief-section::before,
  .brief-sheet-section::before,
  .solution-section::before,
  .cta-terminus::before,
  .email-terminus::before {
    left: 62px;
  }

  .spine-node {
    left: 54px;
  }

  .brief-sheet-section .spine-node {
    left: 54px;
  }

  .shared-responsibility::before {
    left: 58px;
  }

  .shared-responsibility::after {
    left: 67px;
  }

  .capability-row {
    grid-template-columns: minmax(210px, 300px) minmax(0, 1fr);
    gap: 28px;
  }

  .capability-row:nth-child(2) {
    padding-left: 72px;
  }

  .capability-row:nth-child(3) {
    padding-left: 32px;
  }

  .capability-row::before,
  .gate-row::before,
  .compact-gates .gate-row::before,
  .mechanism-row::before {
    left: -55px;
  }

  .cta-terminus,
  .email-terminus,
  .solution-section,
  .platform-cta {
    padding-right: 72px;
    padding-left: 112px;
  }

  .cta-terminus::after,
  .email-terminus::after,
  .solution-section::after {
    left: 55px;
  }

  .mechanism-row {
    grid-template-columns: minmax(190px, 0.7fr) minmax(0, 1fr);
    gap: 20px;
  }

  .platform-cta .line-terminus {
    left: 55px;
  }

  .solution-section,
  .brief-sheet,
  .email-terminus {
    grid-template-columns: minmax(0, 1fr);
    gap: 36px;
  }

  .privacy-layout {
    display: block;
    padding: 48px 72px 84px;
  }

  .privacy-nav {
    position: static;
    margin-bottom: 56px;
  }

  .privacy-nav ol,
  .privacy-nav ul {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .privacy-nav a {
    padding-inline: 10px;
  }
}

@media (max-width: 599px) {
  body {
    font-size: 15px;
  }

  .site-header {
    min-height: 57px;
    padding: 6px 16px;
  }

  .brand {
    font-size: 12px;
    letter-spacing: 0.16em;
  }

  .primary-nav a {
    padding-inline: 20px;
  }

  .site-footer {
    gap: 4px 8px;
    padding: 10px 16px;
    font-size: 12px;
  }

  h1 {
    font-size: 38px;
  }

  h2 {
    font-size: 27px;
  }

  .home-intro,
  .page-intro,
  .start-intro,
  .privacy-intro {
    display: block;
    padding: 48px 20px 44px;
  }

  .home-intro h1 {
    max-width: 350px;
    font-size: 36px;
    line-height: 1.08;
  }

  .home-intro-copy {
    display: block;
    margin-top: 0;
  }

  .home-intro-copy .home-category {
    margin: 0 0 18px;
    font-size: 12px;
    line-height: 1.5;
  }

  .home-intro-copy .home-summary {
    margin-top: 20px;
    font-size: 14.5px;
  }

  .spine-section,
  .mechanism-section,
  .brief-section,
  .brief-sheet-section {
    padding: 40px 20px 44px 46px;
  }

  .spine-section::before,
  .mechanism-section::before,
  .brief-section::before,
  .brief-sheet-section::before,
  .solution-section::before,
  .cta-terminus::before,
  .email-terminus::before {
    left: 19px;
  }

  .spine-node {
    top: 38px;
    left: 12px;
  }

  .brief-sheet-section .spine-node {
    top: 38px;
    left: 12px;
  }

  .brief-origin {
    padding-block: 40px 44px;
  }

  .brief-origin .spine-node {
    top: 38px;
  }

  .brief-origin h2 {
    font-size: 24px;
    line-height: 1.24;
  }

  .brief-origin .category-intro {
    margin-top: 18px;
    font-size: 14px;
    line-height: 1.65;
  }

  .section-label {
    margin-bottom: 12px;
    font-size: 12px;
    letter-spacing: 0.15em;
  }

  .capability-row {
    display: block;
    padding: 18px 0 20px;
  }

  .capability-row:nth-child(2) {
    padding-left: 24px;
  }

  .capability-row:nth-child(3) {
    padding-left: 12px;
  }

  .capability-row::before,
  .gate-row::before,
  .compact-gates .gate-row::before,
  .mechanism-row::before {
    top: 26px;
    left: -31px;
    width: 8px;
    height: 8px;
  }

  .capability-row h2,
  .capability-row h3,
  .capability-row strong {
    display: block;
    margin-bottom: 6px;
    font-size: 23px;
  }

  .capability-row p {
    font-size: 14px;
  }

  .shared-responsibility {
    padding-block: 36px 40px;
  }

  .shared-responsibility::before {
    left: 15px;
  }

  .shared-responsibility::after {
    left: 22px;
  }

  .responsibility-grid {
    grid-template-columns: minmax(0, 1fr);
    gap: 14px;
  }

  .responsibility-grid > :first-child {
    font-size: 23px;
    line-height: 1.3;
  }

  .responsibility-grid > :last-child {
    padding-top: 0;
    font-size: 14px;
    line-height: 1.65;
  }

  .gates-section {
    padding-block: 20px 48px;
  }

  .gate-row {
    grid-template-columns: 36px minmax(0, 1fr);
    gap: 10px;
    padding: 15px 0 16px;
  }

  .gate-code {
    font-size: 13px;
  }

  .gate-copy {
    font-size: 14px;
    line-height: 1.5;
  }

  .scenario-note {
    margin-top: 14px;
    font-size: 12px;
    line-height: 1.7;
  }

  .confidence-note {
    margin-top: 28px;
    font-size: 14px;
  }

  .cta-terminus,
  .email-terminus,
  .solution-section,
  .platform-cta {
    padding: 56px 20px 56px 46px;
  }

  .cta-terminus::before,
  .email-terminus::before {
    height: 44px;
  }

  .cta-terminus::after,
  .email-terminus::after,
  .solution-section::after {
    top: 44px;
    left: 12px;
  }

  .cta-terminus h2,
  .email-terminus h2 {
    font-size: 28px;
  }

  .button-link {
    width: 100%;
    padding-inline: 18px;
    text-align: center;
  }

  .page-intro h1,
  .start-intro h1,
  .privacy-intro h1 {
    font-size: 38px;
  }

  .page-intro > p,
  .page-intro > div > p,
  .start-intro p,
  .privacy-intro p {
    margin-top: 20px;
    font-size: 14.5px;
  }

  .selection-boundary {
    margin-top: 28px;
    padding: 18px 0 0;
    border-top: 1px solid var(--line);
    border-left: 0;
  }

  .selection-boundary p {
    font-size: 13px;
  }

  .mechanism-row {
    display: block;
    padding: 20px 0 22px;
  }

  .mechanism-row h2,
  .mechanism-row h3,
  .mechanism-row strong {
    display: block;
    margin-bottom: 6px;
    font-size: 23px;
  }

  .mechanism-row p {
    font-size: 14px;
  }

  .solution-section {
    display: block;
  }

  .solution-section .section-label {
    margin-bottom: 12px;
  }

  .solution-section h2 {
    font-size: 28px;
  }

  .solution-section p {
    margin-top: 18px;
    font-size: 14px;
  }

  .brief-section > p {
    font-size: 18px;
  }

  .compact-gates {
    margin-top: 30px;
  }

  .platform-cta h2 {
    font-size: 27px;
  }

  .platform-cta .line-terminus {
    left: 12px;
  }

  .brief-sheet-section {
    padding-block: 36px 60px;
  }

  .brief-sheet {
    display: block;
    padding: 28px 0 30px;
  }

  .brief-sheet h2 {
    margin-bottom: 22px;
    font-size: 27px;
  }

  .brief-sheet li {
    font-size: 14px;
  }

  .email-terminus {
    display: block;
  }

  .email-terminus p {
    font-size: 14px;
  }

  .email-actions {
    margin-top: 28px;
  }

  .privacy-note {
    margin: 0 20px;
    padding: 20px;
    font-size: 13px;
  }

  .privacy-layout {
    display: block;
    padding: 36px 20px 72px;
  }

  .privacy-nav {
    position: static;
    margin-bottom: 52px;
  }

  .privacy-nav ol,
  .privacy-nav ul {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .privacy-nav a {
    min-height: 48px;
    padding: 8px;
    border-right: 1px solid var(--soft);
    font-size: 12px;
  }

  .privacy-copy > section,
  .privacy-copy > article {
    grid-template-columns: 44px minmax(0, 1fr);
    gap: 14px;
    padding-bottom: 38px;
    margin-bottom: 38px;
  }

  .privacy-number {
    font-size: 30px;
  }

  .privacy-copy h2 {
    font-size: 25px;
  }

  .privacy-copy p,
  .privacy-copy li {
    font-size: 14px;
    line-height: 1.7;
  }

  .not-found {
    min-height: calc(100vh - 121px);
    padding: 64px 20px;
  }
}

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

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}