@font-face {
  font-family: "IBM Plex Sans";
  src: url("./assets/IBMPlexSans-Regular-Latin1.woff2") format("woff2");
  font-style: normal;
  font-weight: 400;
  font-display: swap;
}

@font-face {
  font-family: "IBM Plex Sans";
  src: url("./assets/IBMPlexSans-SemiBold-Latin1.woff2") format("woff2");
  font-style: normal;
  font-weight: 600;
  font-display: swap;
}

@font-face {
  font-family: "IBM Plex Sans";
  src: url("./assets/IBMPlexSans-Bold-Latin1.woff2") format("woff2");
  font-style: normal;
  font-weight: 700;
  font-display: swap;
}

:root {
  color-scheme: light dark;
  --page: #f1f4ef;
  --surface: #e7ebe5;
  --surface-strong: #dce2da;
  --ink: #151a16;
  --muted: #59635b;
  --hairline: #c8d0c7;
  --accent: #2f6f47;
  --accent-strong: #245c39;
  --accent-ink: #f4f8f2;
  --code: #161a17;
  --code-ink: #eef4eb;
  --header: rgb(241 244 239 / 0.9);
  --shadow: rgb(28 52 34 / 0.14);
  --focus: #2f6f47;
  --radius: 16px;
  --radius-control: 10px;
  --radius-nested: 8px;
  --page-pad: clamp(1.25rem, 4vw, 4.5rem);
  --content: 1420px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --page: #101311;
    --surface: #171b18;
    --surface-strong: #1e2420;
    --ink: #edf2eb;
    --muted: #aab5ac;
    --hairline: #303a32;
    --accent: #77c38e;
    --accent-strong: #93daa7;
    --accent-ink: #0f1711;
    --code: #0b0e0c;
    --code-ink: #e7efe5;
    --header: rgb(16 19 17 / 0.88);
    --shadow: rgb(0 0 0 / 0.3);
    --focus: #93daa7;
  }
}

:root[data-theme="light"] {
  color-scheme: light;
  --page: #f1f4ef;
  --surface: #e7ebe5;
  --surface-strong: #dce2da;
  --ink: #151a16;
  --muted: #59635b;
  --hairline: #c8d0c7;
  --accent: #2f6f47;
  --accent-strong: #245c39;
  --accent-ink: #f4f8f2;
  --code: #161a17;
  --code-ink: #eef4eb;
  --header: rgb(241 244 239 / 0.9);
  --shadow: rgb(28 52 34 / 0.14);
  --focus: #2f6f47;
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --page: #101311;
  --surface: #171b18;
  --surface-strong: #1e2420;
  --ink: #edf2eb;
  --muted: #aab5ac;
  --hairline: #303a32;
  --accent: #77c38e;
  --accent-strong: #93daa7;
  --accent-ink: #0f1711;
  --code: #0b0e0c;
  --code-ink: #e7efe5;
  --header: rgb(16 19 17 / 0.88);
  --shadow: rgb(0 0 0 / 0.3);
  --focus: #93daa7;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 5.5rem;
}

body {
  margin: 0;
  background: var(--page);
  color: var(--ink);
  font-family: "IBM Plex Sans", "Helvetica Neue", "Segoe UI", sans-serif;
  font-size: 1rem;
  line-height: 1.6;
  text-rendering: optimizeLegibility;
}

img {
  display: block;
  height: auto;
  max-width: 100%;
}

a {
  color: inherit;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

button {
  font: inherit;
}

:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 4px;
}

::selection {
  background: var(--accent);
  color: var(--accent-ink);
}

.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;
  top: 1rem;
  left: 1rem;
  z-index: 20;
  padding: 0.7rem 1rem;
  border-radius: var(--radius-control);
  background: var(--accent);
  color: var(--accent-ink);
  font-weight: 700;
  text-decoration: none;
  transform: translateY(-180%);
}

.skip-link:focus {
  transform: translateY(0);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  border-bottom: 1px solid var(--hairline);
  background: var(--header);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
}

.nav-shell {
  display: flex;
  width: min(100%, var(--content));
  min-height: 72px;
  padding: 0 var(--page-pad);
  margin: 0 auto;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--ink);
  font-size: 1.02rem;
  font-weight: 760;
  letter-spacing: -0.02em;
  text-decoration: none;
}

.brand-mark {
  display: grid;
  width: 2.05rem;
  height: 2.05rem;
  border-radius: var(--radius-control);
  background: var(--ink);
  color: var(--page);
  place-items: center;
  font-family: ui-monospace, "SFMono-Regular", Consolas, monospace;
  font-size: 0.71rem;
  font-weight: 780;
  letter-spacing: -0.08em;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: clamp(1.2rem, 2.5vw, 2.2rem);
  white-space: nowrap;
}

.site-nav a,
.site-footer nav a {
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 640;
  text-decoration: none;
  transition:
    color 180ms ease,
    transform 180ms ease;
}

.site-nav a:hover,
.site-footer nav a:hover {
  color: var(--ink);
}

.site-nav a:active,
.site-footer nav a:active {
  transform: translateY(1px);
}

.site-nav .nav-action {
  padding: 0.55rem 0.85rem;
  border: 1px solid var(--hairline);
  border-radius: var(--radius-control);
  color: var(--ink);
}

.menu-button {
  display: none;
  width: 2.7rem;
  height: 2.7rem;
  padding: 0;
  border: 1px solid var(--hairline);
  border-radius: var(--radius-control);
  background: transparent;
  color: var(--ink);
  cursor: pointer;
  place-items: center;
}

.menu-line {
  position: absolute;
  width: 1rem;
  height: 1px;
  background: currentColor;
  transition: transform 180ms ease;
}

.menu-line:first-child {
  transform: translateY(-3px);
}

.menu-line:nth-child(2) {
  transform: translateY(3px);
}

.menu-button[aria-expanded="true"] .menu-line:first-child {
  transform: rotate(45deg);
}

.menu-button[aria-expanded="true"] .menu-line:nth-child(2) {
  transform: rotate(-45deg);
}

.hero {
  display: grid;
  min-height: calc(100dvh - 73px);
  align-items: center;
  overflow: hidden;
}

.hero-grid {
  display: grid;
  width: min(100%, var(--content));
  padding: clamp(2.5rem, 6vh, 5.5rem) var(--page-pad);
  margin: 0 auto;
  align-items: center;
  grid-template-columns: minmax(0, 0.86fr) minmax(31rem, 1.24fr);
  gap: clamp(2.4rem, 6vw, 7.5rem);
}

.hero-copy {
  position: relative;
  z-index: 1;
  padding-bottom: 1rem;
  animation: hero-enter 700ms cubic-bezier(0.16, 1, 0.3, 1) both;
}

.eyebrow {
  margin: 0 0 1.2rem;
  color: var(--accent);
  font-family: ui-monospace, "SFMono-Regular", Consolas, monospace;
  font-size: 0.74rem;
  font-weight: 750;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1,
h2,
p {
  margin-top: 0;
}

h1 {
  max-width: 11ch;
  margin-bottom: 1.6rem;
  font-size: clamp(3.2rem, 4.6vw, 5.6rem);
  font-weight: 760;
  letter-spacing: -0.065em;
  line-height: 0.96;
}

h1 span {
  display: block;
  white-space: nowrap;
}

h2 {
  max-width: 14ch;
  margin-bottom: 1.35rem;
  font-size: clamp(2.4rem, 4.7vw, 5.1rem);
  font-weight: 740;
  letter-spacing: -0.06em;
  line-height: 0.98;
}

.hero-summary {
  max-width: 34rem;
  margin-bottom: 2.15rem;
  color: var(--muted);
  font-size: clamp(1.05rem, 1.45vw, 1.28rem);
  line-height: 1.5;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.button {
  display: inline-flex;
  min-height: 3rem;
  padding: 0.7rem 1rem;
  border: 1px solid transparent;
  border-radius: var(--radius-control);
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
  font-weight: 740;
  text-decoration: none;
  white-space: nowrap;
  transition:
    transform 180ms ease,
    background 180ms ease,
    border-color 180ms ease;
}

.button:hover {
  transform: translateY(-2px);
}

.button:active {
  transform: translateY(1px) scale(0.99);
}

.button-primary {
  background: var(--accent);
  color: var(--accent-ink);
}

.button-primary:hover {
  background: var(--accent-strong);
}

.button-secondary {
  border-color: var(--hairline);
  background: var(--surface);
  color: var(--ink);
}

.button-secondary:hover {
  border-color: var(--muted);
}

.hero-visual {
  position: relative;
  min-width: 0;
  margin: 0;
  animation: hero-image-enter 900ms 120ms cubic-bezier(0.16, 1, 0.3, 1) both;
}

.hero-visual::before {
  position: absolute;
  inset: 10% 7% -3% 12%;
  z-index: -1;
  border-radius: var(--radius);
  background: var(--accent);
  content: "";
  opacity: 0.1;
  filter: blur(42px);
}

.hero-visual img {
  width: 100%;
  min-height: 28rem;
  border-radius: var(--radius);
  box-shadow: 0 2rem 5rem var(--shadow);
  object-fit: cover;
  object-position: 64% center;
}

.hero-visual figcaption {
  max-width: 32rem;
  margin: 1rem 0 0 auto;
  color: var(--muted);
  font-family: ui-monospace, "SFMono-Regular", Consolas, monospace;
  font-size: 0.72rem;
  line-height: 1.5;
}

.contract-strip {
  border-top: 1px solid var(--hairline);
  border-bottom: 1px solid var(--hairline);
}

.contract-strip dl {
  display: grid;
  width: min(100%, var(--content));
  padding: 0 var(--page-pad);
  margin: 0 auto;
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.contract-strip dl > div {
  padding: 1.5rem clamp(1rem, 2.4vw, 2rem);
  border-left: 1px solid var(--hairline);
}

.contract-strip dl > div:first-child {
  padding-left: 0;
  border-left: 0;
}

.contract-strip dt,
.mode-panel dt {
  margin-bottom: 0.2rem;
  color: var(--muted);
  font-family: ui-monospace, "SFMono-Regular", Consolas, monospace;
  font-size: 0.68rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.contract-strip dd,
.mode-panel dd {
  margin: 0;
  color: var(--ink);
  font-size: 0.95rem;
  font-weight: 690;
}

.section {
  width: min(100%, var(--content));
  padding: clamp(6rem, 11vw, 10rem) var(--page-pad);
  margin: 0 auto;
}

.section-heading {
  max-width: 49rem;
  margin-bottom: clamp(3.5rem, 7vw, 6rem);
}

.section-heading p,
.durability-copy > p,
.compatibility-intro p,
.install-copy p {
  max-width: 42rem;
  margin-bottom: 0;
  color: var(--muted);
  font-size: clamp(1rem, 1.35vw, 1.16rem);
}

.architecture-map {
  display: grid;
  padding: clamp(1.3rem, 3.2vw, 3rem);
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  background:
    linear-gradient(90deg, transparent 49.8%, var(--hairline) 50%, transparent 50.2%),
    linear-gradient(transparent 49.8%, var(--hairline) 50%, transparent 50.2%),
    var(--surface);
  background-size: 4rem 4rem;
  grid-template-columns: minmax(9rem, 0.55fr) minmax(8rem, 0.48fr) minmax(0, 1.6fr);
  align-items: center;
  gap: clamp(1.5rem, 4vw, 4.5rem);
}

.map-source,
.broker-unit {
  display: flex;
  min-height: 11rem;
  padding: 1.35rem;
  border: 1px solid var(--hairline);
  border-radius: var(--radius-control);
  background: var(--page);
  flex-direction: column;
  justify-content: space-between;
}

.map-source strong,
.broker-unit strong {
  font-size: 1.1rem;
  letter-spacing: -0.025em;
}

.map-source small {
  color: var(--muted);
}

.map-label,
.broker-index {
  color: var(--accent);
  font-family: ui-monospace, "SFMono-Regular", Consolas, monospace;
  font-size: 0.68rem;
  font-weight: 720;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.map-route {
  display: grid;
  color: var(--muted);
  font-family: ui-monospace, "SFMono-Regular", Consolas, monospace;
  font-size: 0.72rem;
  text-align: center;
  gap: 0.75rem;
}

.route-line {
  position: relative;
  display: block;
  height: 1px;
  background: var(--accent);
}

.route-line::after {
  position: absolute;
  top: -4px;
  right: -1px;
  width: 8px;
  height: 8px;
  border-top: 1px solid var(--accent);
  border-right: 1px solid var(--accent);
  content: "";
  transform: rotate(45deg);
}

.broker-cluster {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.8rem;
}

.broker-unit {
  min-height: 13rem;
}

.disk {
  display: inline-flex;
  width: fit-content;
  padding: 0.4rem 0.58rem;
  border: 1px solid color-mix(in srgb, var(--accent) 42%, var(--hairline));
  border-radius: var(--radius-nested);
  color: var(--accent);
  font-family: ui-monospace, "SFMono-Regular", Consolas, monospace;
  font-size: 0.72rem;
  font-weight: 680;
}

.architecture-notes {
  display: flex;
  padding: 1.8rem 0 0;
  align-items: flex-start;
  justify-content: space-between;
  gap: 2rem;
}

.architecture-notes p {
  max-width: 39rem;
  margin: 0;
  color: var(--muted);
}

.text-link {
  display: inline;
  color: var(--ink);
  font-size: 0.88rem;
  font-weight: 740;
  text-decoration-color: var(--accent);
  text-decoration-thickness: 2px;
  text-underline-offset: 5px;
}

.text-link:hover {
  color: var(--accent);
}

.durability-section {
  width: 100%;
  max-width: none;
  padding-right: 0;
  padding-left: 0;
  border-top: 1px solid var(--hairline);
  border-bottom: 1px solid var(--hairline);
  background: var(--surface);
}

.durability-grid {
  display: grid;
  width: min(100%, var(--content));
  padding: 0 var(--page-pad);
  margin: 0 auto;
  align-items: center;
  grid-template-columns: minmax(18rem, 0.72fr) minmax(0, 1.28fr);
  gap: clamp(3rem, 8vw, 8rem);
}

.storage-visual {
  max-width: 33rem;
  margin: 0;
}

.storage-visual img {
  width: 100%;
  max-height: 44rem;
  border-radius: var(--radius);
  box-shadow: 0 2rem 5rem var(--shadow);
  object-fit: cover;
}

.durability-copy {
  max-width: 45rem;
}

.durability-copy h2 {
  max-width: 12ch;
}

.mode-tabs {
  display: flex;
  padding: 0.35rem;
  margin-top: 2.5rem;
  border: 1px solid var(--hairline);
  border-radius: var(--radius-control);
  background: var(--page);
  gap: 0.35rem;
}

.mode-tabs button {
  min-width: 0;
  padding: 0.65rem 0.85rem;
  border: 0;
  border-radius: var(--radius-nested);
  background: transparent;
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 690;
  cursor: pointer;
  flex: 1;
  white-space: nowrap;
}

.mode-tabs button[aria-selected="true"] {
  background: var(--accent);
  color: var(--accent-ink);
}

.mode-tabs button:active {
  transform: translateY(1px);
}

.mode-panel {
  min-height: 13rem;
  padding: 2rem 0 0;
}

.mode-panel[hidden] {
  display: none;
}

.mode-panel dl {
  display: grid;
  margin: 0 0 2rem;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.5rem;
}

.mode-panel dl > div {
  padding-left: 1rem;
  border-left: 2px solid var(--accent);
}

.mode-panel p {
  max-width: 36rem;
  margin: 0;
  color: var(--muted);
}

.compatibility-intro {
  max-width: 49rem;
  margin: 0 0 3.4rem 14%;
}

.compatibility-intro h2 {
  max-width: 12ch;
}

.command-rail {
  display: flex;
  width: calc(100% + var(--page-pad));
  padding: 0.25rem var(--page-pad) 1.1rem 0;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  scrollbar-color: var(--accent) transparent;
  gap: 0.65rem;
}

.command-rail span {
  min-width: 7rem;
  padding: 1rem 1.15rem;
  border: 1px solid var(--hairline);
  border-radius: var(--radius-control);
  background: var(--surface);
  color: var(--ink);
  font-family: ui-monospace, "SFMono-Regular", Consolas, monospace;
  font-size: 0.78rem;
  font-weight: 730;
  scroll-snap-align: start;
}

.compatibility-details {
  display: grid;
  padding-top: clamp(3rem, 6vw, 5rem);
  grid-template-columns: 1.35fr 0.95fr;
  gap: 0;
}

.compatibility-details article {
  min-height: 11rem;
  padding: 1.7rem;
  border-top: 1px solid var(--hairline);
}

.compatibility-details article:nth-child(odd) {
  padding-left: 0;
  border-right: 1px solid var(--hairline);
}

.compatibility-details strong {
  font-size: 1.12rem;
  letter-spacing: -0.025em;
}

.compatibility-details p {
  max-width: 26rem;
  margin: 0.7rem 0 0;
  color: var(--muted);
}

.evidence-section {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(18rem, 0.65fr);
  gap: clamp(4rem, 10vw, 10rem);
  border-top: 1px solid var(--hairline);
}

.evidence-statement > p {
  max-width: 16ch;
  margin-bottom: 2.5rem;
  font-size: clamp(2.6rem, 5vw, 5.4rem);
  font-weight: 720;
  letter-spacing: -0.06em;
  line-height: 1;
}

.evidence-facts > div {
  display: grid;
  padding: 1.4rem 0;
  border-bottom: 1px solid var(--hairline);
  grid-template-columns: 3rem 1fr;
  gap: 0.8rem;
}

.evidence-facts > div:first-child {
  padding-top: 0;
}

.evidence-facts span {
  color: var(--accent);
  font-family: ui-monospace, "SFMono-Regular", Consolas, monospace;
  font-size: 0.72rem;
  font-weight: 720;
}

.evidence-facts p {
  margin: 0;
  color: var(--muted);
}

.install-section {
  width: 100%;
  max-width: none;
  padding-right: 0;
  padding-left: 0;
  border-top: 1px solid var(--hairline);
  background: var(--surface);
}

.install-shell {
  display: grid;
  width: min(100%, var(--content));
  padding: 0 var(--page-pad);
  margin: 0 auto;
  align-items: end;
  grid-template-columns: minmax(16rem, 0.7fr) minmax(0, 1.3fr);
  gap: clamp(3rem, 8vw, 7rem);
}

.install-copy h2 {
  margin-bottom: 1rem;
}

.install-command {
  overflow: hidden;
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  background: var(--code);
  box-shadow: 0 2rem 5rem var(--shadow);
}

.code-header {
  display: flex;
  min-height: 3.2rem;
  padding: 0 0.75rem 0 1.15rem;
  border-bottom: 1px solid #313a33;
  align-items: center;
  justify-content: space-between;
  color: #aab5ac;
  font-family: ui-monospace, "SFMono-Regular", Consolas, monospace;
  font-size: 0.7rem;
}

.copy-button {
  padding: 0.45rem 0.75rem;
  border: 1px solid #435047;
  border-radius: var(--radius-nested);
  background: #222a24;
  color: #edf2eb;
  font-size: 0.75rem;
  font-weight: 680;
  cursor: pointer;
}

.copy-button:hover {
  border-color: #778479;
}

.copy-button:active {
  transform: translateY(1px);
}

pre {
  max-width: 100%;
  padding: clamp(1.2rem, 3vw, 2rem);
  margin: 0;
  overflow-x: auto;
  color: var(--code-ink);
  font-family: ui-monospace, "SFMono-Regular", Consolas, monospace;
  font-size: clamp(0.74rem, 1.1vw, 0.9rem);
  line-height: 1.75;
}

.site-footer {
  display: flex;
  width: min(100%, var(--content));
  min-height: 16rem;
  padding: 4rem var(--page-pad);
  margin: 0 auto;
  align-items: flex-start;
  justify-content: space-between;
  gap: 3rem;
}

.footer-brand {
  margin-bottom: 1.2rem;
}

.site-footer p {
  max-width: 27rem;
  margin: 0;
  color: var(--muted);
}

.site-footer nav {
  display: flex;
  gap: 1.8rem;
}

.copy-status {
  position: fixed;
  right: 1.25rem;
  bottom: 1.25rem;
  z-index: 15;
  max-width: min(22rem, calc(100vw - 2.5rem));
  padding: 0.75rem 1rem;
  border: 1px solid var(--hairline);
  border-radius: var(--radius-control);
  background: var(--ink);
  color: var(--page);
  font-size: 0.82rem;
  font-weight: 680;
  opacity: 0;
  pointer-events: none;
  transform: translateY(1rem);
  transition:
    opacity 180ms ease,
    transform 180ms ease;
}

.copy-status.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.reveal-ready [data-reveal] {
  opacity: 0;
  transform: translateY(28px);
  transition:
    opacity 700ms cubic-bezier(0.16, 1, 0.3, 1),
    transform 700ms cubic-bezier(0.16, 1, 0.3, 1);
}

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

@keyframes hero-enter {
  from {
    transform: translateY(26px);
  }
}

@keyframes hero-image-enter {
  from {
    transform: translateX(28px) scale(0.98);
  }
}

@media (max-width: 1040px) {
  .hero {
    min-height: auto;
  }

  .hero-grid {
    padding-top: 4rem;
    padding-bottom: 4rem;
    grid-template-columns: minmax(0, 0.86fr) minmax(24rem, 1.14fr);
    gap: 2.5rem;
  }

  h1 {
    font-size: clamp(3rem, 4.6vw, 4.6rem);
  }

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

  .contract-strip dl > div:nth-child(3) {
    padding-left: 0;
    border-top: 1px solid var(--hairline);
    border-left: 0;
  }

  .contract-strip dl > div:nth-child(4) {
    border-top: 1px solid var(--hairline);
  }

  .architecture-map {
    grid-template-columns: minmax(8rem, 0.55fr) minmax(6rem, 0.35fr) minmax(0, 1.45fr);
    gap: 1.2rem;
  }

  .broker-cluster {
    grid-template-columns: 1fr;
  }

  .broker-unit {
    min-height: 8rem;
  }

  .durability-grid {
    grid-template-columns: minmax(16rem, 0.76fr) minmax(0, 1.24fr);
    gap: 3rem;
  }
}

@media (max-width: 800px) {
  html {
    scroll-padding-top: 4.75rem;
  }

  .nav-shell {
    min-height: 66px;
  }

  .menu-button {
    position: relative;
    display: grid;
  }

  .site-nav {
    position: absolute;
    top: calc(100% + 1px);
    right: 0;
    left: 0;
    display: none;
    padding: 1rem var(--page-pad) 1.25rem;
    border-bottom: 1px solid var(--hairline);
    background: var(--page);
    align-items: stretch;
    flex-direction: column;
    gap: 0;
  }

  .site-nav.is-open {
    display: flex;
  }

  .site-nav a {
    padding: 0.85rem 0;
    border-bottom: 1px solid var(--hairline);
  }

  .site-nav .nav-action {
    margin-top: 0.8rem;
    border: 1px solid var(--hairline);
    text-align: center;
  }

  .hero-grid,
  .durability-grid,
  .install-shell,
  .evidence-section {
    grid-template-columns: 1fr;
  }

  .hero-grid {
    width: 100%;
    padding-top: 3.5rem;
    padding-bottom: 4rem;
    gap: 3rem;
  }

  h1 {
    max-width: 9ch;
    font-size: clamp(3.2rem, 15vw, 5.4rem);
  }

  h1 span {
    white-space: normal;
  }

  .hero-summary {
    max-width: 28rem;
  }

  .hero-visual img {
    min-height: 25rem;
    object-position: 68% center;
  }

  .section {
    padding-top: 6rem;
    padding-bottom: 6rem;
  }

  .architecture-map {
    padding: 1rem;
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  .map-source,
  .broker-unit {
    min-height: 8.5rem;
  }

  .map-route {
    min-height: 5rem;
    align-content: center;
  }

  .route-line {
    width: 1px;
    height: 2.6rem;
    margin: 0 auto;
  }

  .route-line::after {
    top: auto;
    right: -4px;
    bottom: 0;
    transform: rotate(135deg);
  }

  .architecture-notes {
    flex-direction: column;
  }

  .durability-grid {
    gap: 4rem;
  }

  .storage-visual {
    width: min(82%, 28rem);
    margin-left: auto;
  }

  .compatibility-intro {
    margin-left: 0;
  }

  .compatibility-details {
    grid-template-columns: 1fr;
  }

  .compatibility-details article,
  .compatibility-details article:nth-child(odd) {
    min-height: auto;
    padding: 1.7rem 0;
    border-right: 0;
  }

  .evidence-section {
    gap: 4rem;
  }

  .install-shell {
    gap: 3rem;
  }

  .site-footer {
    flex-direction: column;
  }
}

@media (max-width: 520px) {
  :root {
    --page-pad: 1.15rem;
    --radius: 14px;
  }

  .brand {
    font-size: 0.95rem;
  }

  .brand-mark {
    width: 1.9rem;
    height: 1.9rem;
  }

  .hero-grid {
    padding-top: 2.7rem;
  }

  h1 {
    font-size: clamp(3rem, 16vw, 4.5rem);
  }

  h2 {
    font-size: clamp(2.45rem, 12vw, 3.7rem);
  }

  .hero-actions {
    align-items: stretch;
    flex-direction: column;
  }

  .button {
    width: 100%;
  }

  .hero-visual img {
    min-height: 21rem;
  }

  .contract-strip dl {
    grid-template-columns: 1fr;
  }

  .contract-strip dl > div {
    padding: 1rem 0;
    border-top: 1px solid var(--hairline);
    border-left: 0;
  }

  .contract-strip dl > div:first-child {
    border-top: 0;
  }

  .mode-tabs {
    align-items: stretch;
    flex-direction: column;
  }

  .mode-tabs button {
    width: 100%;
  }

  .mode-panel {
    min-height: 17rem;
  }

  .mode-panel dl {
    grid-template-columns: 1fr;
  }

  .storage-visual {
    width: 90%;
  }

  .command-rail {
    width: calc(100% + 1.15rem);
  }

  .site-footer nav {
    align-items: flex-start;
    flex-direction: column;
    gap: 0.8rem;
  }
}

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

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

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

@media (prefers-reduced-transparency: reduce) {
  .site-header {
    background: var(--page);
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
  }
}