@import url("https://fonts.googleapis.com/css2?family=Barlow+Condensed:wght@500;600;700&family=IBM+Plex+Mono:wght@400;500;600&family=Source+Sans+3:opsz,wght@8..60,400;8..60,500;8..60,600;8..60,700&display=swap");

:root {
  color-scheme: light;
  --packet-navy: #102832;
  --packet-navy-soft: #183845;
  --transit-teal: #19788b;
  --wire-cyan: #7ad4df;
  --decision-amber: #f2b950;
  --porcelain: #f4f8f7;
  --paper: #ffffff;
  --slate: #587078;
  --ink: #15282f;
  --muted: #60737a;
  --line: #d5e1e1;
  --line-strong: #a9c1c4;
  --danger: #b23a35;
  --success: #2f8673;
  --display: "Barlow Condensed", "Arial Narrow", sans-serif;
  --body: "Source Sans 3", system-ui, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, monospace;
  --header-height: 4.5rem;
  --content-width: 88rem;
  --reading-width: 48rem;
  --shadow: 0 18px 60px rgb(16 40 50 / 12%);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 2rem);
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--porcelain);
  font-family: var(--body);
  font-size: 1rem;
  line-height: 1.6;
  text-rendering: optimizeLegibility;
}

body.menu-open {
  overflow: hidden;
}

a {
  color: inherit;
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.18em;
}

button,
input {
  font: inherit;
}

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

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

::selection {
  color: var(--packet-navy);
  background: var(--wire-cyan);
}

.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;
}

.site-header {
  position: sticky;
  z-index: 50;
  top: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: var(--header-height);
  padding: 0 2rem;
  color: var(--paper);
  background: rgb(16 40 50 / 96%);
  border-bottom: 1px solid rgb(122 212 223 / 22%);
  backdrop-filter: blur(14px);
}

.brand {
  display: inline-flex;
  gap: 0.75rem;
  align-items: center;
  color: inherit;
  text-decoration: none;
}

.brand-mark {
  width: 2.25rem;
  fill: none;
  stroke: var(--wire-cyan);
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 2.2;
}

.brand-mark circle {
  fill: var(--decision-amber);
  stroke: none;
}

.brand > span {
  display: grid;
  line-height: 1;
}

.brand strong {
  font-family: var(--mono);
  font-size: 0.96rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.brand small {
  margin-top: 0.28rem;
  color: #a9c4ca;
  font-family: var(--mono);
  font-size: 0.62rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.header-actions {
  display: flex;
  gap: 0.8rem;
  align-items: center;
}

.search-trigger {
  display: flex;
  gap: 0.65rem;
  align-items: center;
  min-width: 16rem;
  padding: 0.55rem 0.65rem;
  color: #d8e9eb;
  cursor: pointer;
  background: rgb(255 255 255 / 7%);
  border: 1px solid rgb(122 212 223 / 24%);
  border-radius: 2px;
}

.search-trigger:hover {
  background: rgb(255 255 255 / 12%);
  border-color: rgb(122 212 223 / 52%);
}

.search-trigger svg,
.search-header svg {
  width: 1.05rem;
  fill: none;
  stroke: currentcolor;
  stroke-linecap: round;
  stroke-width: 1.8;
}

.search-trigger span {
  flex: 1;
  text-align: left;
}

kbd {
  min-width: 1.7rem;
  padding: 0.08rem 0.35rem;
  color: #b9cdd1;
  font-family: var(--mono);
  font-size: 0.72rem;
  text-align: center;
  background: rgb(0 0 0 / 18%);
  border: 1px solid rgb(255 255 255 / 13%);
  border-radius: 2px;
}

.github-link {
  padding: 0.45rem 0.2rem;
  color: #d8e9eb;
  font-size: 0.92rem;
  font-weight: 600;
  text-decoration: none;
}

.github-link:hover {
  color: var(--wire-cyan);
}

.menu-trigger {
  display: none;
  width: 2.7rem;
  height: 2.7rem;
  cursor: pointer;
  background: transparent;
  border: 1px solid rgb(122 212 223 / 28%);
}

.menu-trigger i {
  display: block;
  width: 1.15rem;
  height: 1px;
  margin: 0.32rem auto;
  background: var(--paper);
  transition: transform 160ms ease;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 0.92fr) minmax(32rem, 1.08fr);
  gap: clamp(3rem, 7vw, 7rem);
  align-items: center;
  min-height: calc(100vh - var(--header-height));
  max-width: var(--content-width);
  padding: clamp(5rem, 9vw, 8.5rem) 2rem;
  margin: 0 auto;
}

.eyebrow,
.section-heading > p,
.quick-command > div > p {
  margin: 0 0 1.2rem;
  color: var(--transit-teal);
  font-family: var(--mono);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}

.hero h1 {
  max-width: 11ch;
  margin: 0;
  color: var(--packet-navy);
  font-family: var(--display);
  font-size: clamp(4rem, 7.8vw, 7.3rem);
  font-weight: 600;
  letter-spacing: -0.035em;
  line-height: 0.82;
  text-transform: uppercase;
}

.hero h1 em {
  color: var(--transit-teal);
  font-style: normal;
}

.hero-lede {
  max-width: 37rem;
  margin: 2.2rem 0 0;
  color: #435a62;
  font-size: clamp(1.08rem, 1.8vw, 1.32rem);
  line-height: 1.55;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
  margin-top: 2.25rem;
}

.button-primary,
.button-secondary {
  display: inline-flex;
  gap: 1.5rem;
  align-items: center;
  justify-content: center;
  min-height: 3.15rem;
  padding: 0.7rem 1.15rem;
  font-weight: 700;
  text-decoration: none;
  border: 1px solid var(--packet-navy);
}

.button-primary {
  color: var(--paper);
  background: var(--packet-navy);
}

.button-primary:hover {
  color: var(--packet-navy);
  background: var(--wire-cyan);
}

.button-secondary:hover {
  color: var(--paper);
  background: var(--transit-teal);
  border-color: var(--transit-teal);
}

.hero-facts {
  display: grid;
  gap: 0.45rem;
  padding: 1.8rem 0 0;
  margin: 2rem 0 0;
  list-style: none;
  border-top: 1px solid var(--line-strong);
}

.hero-facts li {
  display: grid;
  grid-template-columns: 5.2rem 1fr;
  gap: 1rem;
  align-items: baseline;
}

.hero-facts span {
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.66rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.hero-facts strong {
  font-size: 0.92rem;
  font-weight: 600;
}

.route-console {
  position: relative;
  isolation: isolate;
  min-height: 34rem;
  padding: 1.4rem;
  overflow: hidden;
  color: #ddecf0;
  background: var(--packet-navy);
  box-shadow: var(--shadow);
  clip-path: polygon(0 0, calc(100% - 1.4rem) 0, 100% 1.4rem, 100% 100%, 1.4rem 100%, 0 calc(100% - 1.4rem));
}

.route-console::before {
  position: absolute;
  z-index: -1;
  inset: 0;
  content: "";
  background-image:
    linear-gradient(rgb(122 212 223 / 6%) 1px, transparent 1px),
    linear-gradient(90deg, rgb(122 212 223 / 6%) 1px, transparent 1px);
  background-size: 2rem 2rem;
  mask-image: linear-gradient(to bottom, #000, transparent 92%);
}

.route-console > header,
.route-console > footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.route-console > header {
  padding-bottom: 1rem;
  color: #a8c3c9;
  border-bottom: 1px solid rgb(122 212 223 / 18%);
}

.route-console > header div {
  display: flex;
  gap: 0.55rem;
  align-items: center;
}

.route-console > header code {
  color: var(--wire-cyan);
}

.live-dot {
  width: 0.5rem;
  height: 0.5rem;
  background: var(--decision-amber);
  border-radius: 50%;
  box-shadow: 0 0 0 0 rgb(242 185 80 / 55%);
  animation: route-pulse 2.2s ease-out 2;
}

@keyframes route-pulse {
  50% { box-shadow: 0 0 0 0.45rem rgb(242 185 80 / 0%); }
}

.route-tabs {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  margin: 1.6rem 0 2.2rem;
  border: 1px solid rgb(122 212 223 / 20%);
}

.route-tabs button {
  padding: 0.65rem 0.4rem;
  color: #9cb9c0;
  font-family: var(--mono);
  font-size: 0.68rem;
  cursor: pointer;
  background: transparent;
  border: 0;
  border-right: 1px solid rgb(122 212 223 / 20%);
}

.route-tabs button:last-child {
  border-right: 0;
}

.route-tabs button[aria-selected="true"] {
  color: var(--packet-navy);
  background: var(--wire-cyan);
}

.trace-path {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 5.4rem;
  align-items: center;
}

.trace-node {
  grid-column: 1;
  padding: 1rem 1.1rem;
  background: rgb(255 255 255 / 5%);
  border-left: 2px solid var(--wire-cyan);
}

.trace-node span {
  display: block;
  margin-bottom: 0.35rem;
  color: #8eabb2;
  font-family: var(--mono);
  font-size: 0.62rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.trace-node strong {
  display: block;
  overflow: hidden;
  color: #eff8f8;
  font-family: var(--mono);
  font-size: clamp(0.74rem, 1.2vw, 0.88rem);
  font-weight: 500;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.trace-decision {
  border-left-color: var(--decision-amber);
}

.trace-link {
  display: grid;
  grid-template-columns: 1fr 4.5rem;
  grid-column: 1 / -1;
  gap: 0.75rem;
  align-items: center;
  min-height: 3.15rem;
}

.trace-link i {
  position: relative;
  display: block;
  width: 1px;
  height: 100%;
  margin-left: 1.1rem;
  background: rgb(122 212 223 / 40%);
}

.trace-link i::after {
  position: absolute;
  bottom: 0.3rem;
  left: -0.18rem;
  width: 0.35rem;
  height: 0.35rem;
  content: "";
  border-right: 1px solid var(--wire-cyan);
  border-bottom: 1px solid var(--wire-cyan);
  transform: rotate(45deg);
}

.trace-link span {
  color: #7899a1;
  font-family: var(--mono);
  font-size: 0.58rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.route-console > footer {
  padding-top: 1rem;
  margin-top: 2rem;
  color: #8ca8af;
  border-top: 1px solid rgb(122 212 223 / 18%);
}

.route-console > footer strong {
  color: var(--decision-amber);
  font-size: 0.66rem;
}

.route-console.is-changing .trace-node strong,
.route-console.is-changing .trace-link span {
  animation: trace-change 220ms ease;
}

@keyframes trace-change {
  from { opacity: 0; transform: translateY(0.25rem); }
}

.home-section {
  max-width: var(--content-width);
  padding: clamp(4.5rem, 8vw, 7rem) 2rem;
  margin: 0 auto;
}

.section-heading {
  display: grid;
  grid-template-columns: minmax(10rem, 0.35fr) minmax(0, 1fr);
  gap: 2rem;
  padding-bottom: 2.2rem;
  border-bottom: 1px solid var(--line-strong);
}

.section-heading h2,
.boundary-callout h2,
.quick-command h2 {
  max-width: 15ch;
  margin: 0;
  color: var(--packet-navy);
  font-family: var(--display);
  font-size: clamp(2.7rem, 5vw, 4.8rem);
  font-weight: 600;
  letter-spacing: -0.025em;
  line-height: 0.96;
  text-transform: uppercase;
}

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

.path-card {
  min-width: 0;
  padding: 2rem 1.4rem 2rem 0;
  border-right: 1px solid var(--line);
}

.path-card + .path-card {
  padding-left: 1.4rem;
}

.path-card:last-child {
  padding-right: 0;
  border-right: 0;
}

.path-card h3 {
  margin: 0;
  color: var(--transit-teal);
  font-family: var(--display);
  font-size: 1.75rem;
  font-weight: 600;
  text-transform: uppercase;
}

.path-card p {
  min-height: 4.6rem;
  margin: 0.6rem 0 1.5rem;
  color: var(--muted);
  font-size: 0.95rem;
  line-height: 1.45;
}

.path-card ul {
  padding: 0;
  margin: 0;
  list-style: none;
}

.path-card li {
  border-top: 1px solid var(--line);
}

.path-card a {
  display: flex;
  gap: 0.5rem;
  align-items: center;
  justify-content: space-between;
  padding: 0.7rem 0;
  font-size: 0.91rem;
  font-weight: 600;
  text-decoration: none;
}

.path-card a span:last-child {
  color: var(--transit-teal);
  transition: transform 140ms ease;
}

.path-card a:hover span:last-child {
  transform: translateX(0.25rem);
}

.protocol-section {
  max-width: none;
  color: #dcecee;
  background: var(--packet-navy);
}

.protocol-section > * {
  max-width: calc(var(--content-width) - 4rem);
  margin-right: auto;
  margin-left: auto;
}

.protocol-section .section-heading {
  border-color: rgb(122 212 223 / 22%);
}

.protocol-section .section-heading > p {
  color: var(--wire-cyan);
}

.protocol-section .section-heading h2 {
  color: var(--paper);
}

.protocol-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
}

.protocol-grid article {
  padding: 2.5rem 2rem 1rem 0;
  border-right: 1px solid rgb(122 212 223 / 18%);
}

.protocol-grid article + article {
  padding-left: 2rem;
}

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

.protocol-name {
  color: var(--decision-amber);
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.protocol-grid h3 {
  margin: 0.75rem 0;
  font-family: var(--display);
  font-size: 2rem;
  font-weight: 600;
  line-height: 1;
  text-transform: uppercase;
}

.protocol-grid p {
  min-height: 6rem;
  color: #a9c0c5;
}

.protocol-grid a {
  color: var(--wire-cyan);
  font-weight: 600;
}

.boundary-callout {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(20rem, 0.65fr);
  gap: clamp(3rem, 9vw, 9rem);
  align-items: end;
  border-bottom: 1px solid var(--line-strong);
}

.boundary-callout p:not(.eyebrow) {
  margin: 0;
  color: #405860;
  font-size: 1.15rem;
}

.callout-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1.3rem;
  margin-top: 1.7rem;
}

.callout-links a,
.quick-command > a {
  color: var(--transit-teal);
  font-weight: 700;
}

.quick-command {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: 3rem;
  align-items: center;
}

.quick-command pre {
  position: relative;
  padding: 1.6rem 2rem;
  margin: 0;
  color: #dcecee;
  background: var(--packet-navy);
  border-left: 3px solid var(--decision-amber);
}

.quick-command code {
  font-family: var(--mono);
}

.quick-command > a {
  grid-column: 2;
  justify-self: start;
}

.docs-layout {
  display: grid;
  grid-template-columns: 16.5rem minmax(0, var(--reading-width)) 13rem;
  gap: clamp(2rem, 4vw, 4rem);
  justify-content: center;
  max-width: var(--content-width);
  min-height: calc(100vh - var(--header-height));
  padding: 0 2rem;
  margin: 0 auto;
}

.doc-nav,
.page-toc {
  position: sticky;
  top: var(--header-height);
  align-self: start;
  max-height: calc(100vh - var(--header-height));
  overflow-y: auto;
  scrollbar-width: thin;
}

.doc-nav {
  padding: 2.2rem 1.3rem 4rem 0;
  border-right: 1px solid var(--line);
}

.nav-overview {
  display: block;
  padding: 0.45rem 0.6rem;
  margin-bottom: 1.8rem;
  color: var(--packet-navy);
  font-weight: 700;
  text-decoration: none;
}

.nav-group {
  margin: 0 0 1.55rem;
}

.nav-group h2 {
  margin: 0 0 0.3rem;
  color: var(--slate);
  font-family: var(--mono);
  font-size: 0.61rem;
  font-weight: 600;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

.nav-group ul {
  padding: 0;
  margin: 0;
  list-style: none;
}

.nav-group a {
  position: relative;
  display: block;
  padding: 0.32rem 0.6rem;
  color: #496069;
  font-size: 0.88rem;
  line-height: 1.3;
  text-decoration: none;
}

.nav-group a:hover,
.nav-overview:hover {
  color: var(--transit-teal);
  background: rgb(25 120 139 / 6%);
}

.nav-group a[aria-current="page"],
.nav-overview[aria-current="page"] {
  color: var(--packet-navy);
  font-weight: 700;
  background: rgb(122 212 223 / 18%);
}

.nav-group a[aria-current="page"]::before,
.nav-overview[aria-current="page"]::before {
  position: absolute;
  top: 0;
  bottom: 0;
  left: -1px;
  width: 3px;
  content: "";
  background: var(--transit-teal);
}

.doc-main {
  min-width: 0;
  padding: 3.5rem 0 0;
}

.doc-kicker {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 0.8rem;
  margin-bottom: 1.8rem;
  color: var(--slate);
  font-family: var(--mono);
  font-size: 0.66rem;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  border-bottom: 1px solid var(--line);
}

.doc-kicker span {
  color: var(--transit-teal);
  font-weight: 600;
}

.doc-kicker a {
  text-decoration: none;
}

.doc-kicker a:hover {
  color: var(--transit-teal);
}

.prose {
  color: #263b43;
  font-size: 1.04rem;
}

.prose > :first-child {
  margin-top: 0;
}

.prose h1,
.prose h2,
.prose h3,
.prose h4 {
  color: var(--packet-navy);
  font-family: var(--display);
  font-weight: 600;
  line-height: 1.05;
}

.prose h1 {
  max-width: 16ch;
  margin: 0 0 1.5rem;
  font-size: clamp(3.2rem, 6vw, 5.2rem);
  letter-spacing: -0.025em;
  text-transform: uppercase;
}

.prose h2 {
  padding-top: 2.2rem;
  margin: 2.8rem 0 1rem;
  font-size: 2.25rem;
  letter-spacing: -0.015em;
  border-top: 1px solid var(--line);
}

.prose h3 {
  margin: 2.2rem 0 0.7rem;
  font-size: 1.58rem;
}

.prose h4 {
  margin: 1.8rem 0 0.5rem;
  font-size: 1.25rem;
}

.prose p,
.prose ul,
.prose ol {
  margin-top: 0.8rem;
  margin-bottom: 1.1rem;
}

.prose li + li {
  margin-top: 0.3rem;
}

.prose a {
  color: #0d7186;
  font-weight: 600;
}

.prose strong {
  color: #132b34;
}

.prose code,
.page-toc code {
  padding: 0.12em 0.35em;
  color: #0e5f70;
  font-family: var(--mono);
  font-size: 0.82em;
  background: #e5eff0;
  border: 1px solid #d1e1e2;
}

.prose pre {
  position: relative;
  max-width: 100%;
  padding: 1.35rem 1.4rem;
  margin: 1.5rem 0;
  overflow: auto;
  color: #deebee;
  background: var(--packet-navy);
  border-left: 3px solid var(--transit-teal);
  box-shadow: 0 10px 30px rgb(16 40 50 / 9%);
}

.prose pre code {
  padding: 0;
  color: inherit;
  font-size: 0.82rem;
  line-height: 1.7;
  background: none;
  border: 0;
}

.mermaid-diagram {
  padding: clamp(1rem, 3vw, 2rem);
  margin: 1.8rem 0;
  overflow-x: auto;
  background:
    linear-gradient(rgb(25 120 139 / 4%) 1px, transparent 1px),
    linear-gradient(90deg, rgb(25 120 139 / 4%) 1px, transparent 1px),
    var(--paper);
  background-size: 1.5rem 1.5rem;
  border: 1px solid var(--line-strong);
  box-shadow: 0 12px 34px rgb(16 40 50 / 8%);
}

.mermaid-diagram svg {
  display: block;
  width: 100% !important;
  min-width: 34rem;
  height: auto !important;
  max-height: 42rem;
  margin: 0 auto;
}

.mermaid-fallback {
  color: #d9e7e9;
  font-family: var(--mono);
  font-size: 0.82rem;
  line-height: 1.7;
  white-space: pre;
  background: #102832;
  border-left: 3px solid var(--danger);
}

.copy-code {
  position: absolute;
  top: 0.55rem;
  right: 0.55rem;
  padding: 0.26rem 0.48rem;
  color: #a9c1c6;
  font-family: var(--mono);
  font-size: 0.61rem;
  cursor: pointer;
  background: #1a3b47;
  border: 1px solid rgb(122 212 223 / 24%);
}

.copy-code:hover {
  color: var(--paper);
  border-color: var(--wire-cyan);
}

.prose blockquote {
  padding: 1rem 1.3rem;
  margin: 1.5rem 0;
  color: #38525b;
  background: rgb(242 185 80 / 12%);
  border-left: 3px solid var(--decision-amber);
}

.prose blockquote p {
  margin: 0;
}

.prose table {
  display: block;
  width: 100%;
  margin: 1.6rem 0;
  overflow-x: auto;
  font-size: 0.9rem;
  line-height: 1.45;
  border-collapse: collapse;
}

.prose th,
.prose td {
  min-width: 8rem;
  padding: 0.72rem 0.85rem;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--line);
}

.prose th {
  color: var(--packet-navy);
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  background: #e8f0f0;
}

.prose hr {
  margin: 3rem 0;
  border: 0;
  border-top: 1px solid var(--line-strong);
}

.page-toc {
  padding: 3.5rem 0 3rem;
}

.page-toc h2 {
  margin: 0 0 0.7rem;
  color: var(--slate);
  font-family: var(--mono);
  font-size: 0.61rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.page-toc ol {
  padding: 0 0 0 0.8rem;
  margin: 0;
  list-style: none;
  border-left: 1px solid var(--line);
}

.page-toc li {
  margin: 0.4rem 0;
}

.page-toc .toc-level-3 {
  padding-left: 0.7rem;
}

.page-toc a {
  display: block;
  color: #61747b;
  font-size: 0.78rem;
  line-height: 1.35;
  text-decoration: none;
}

.page-toc a:hover,
.page-toc a.is-active {
  color: var(--transit-teal);
}

.page-pager {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  padding-top: 2.2rem;
  margin-top: 4rem;
  border-top: 1px solid var(--line-strong);
}

.page-pager a {
  display: grid;
  padding: 0.85rem 1rem;
  font-weight: 700;
  text-decoration: none;
  border: 1px solid var(--line);
}

.page-pager a:hover {
  border-color: var(--transit-teal);
}

.page-pager span {
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.61rem;
  font-weight: 500;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.pager-next {
  text-align: right;
}

.site-footer {
  display: flex;
  flex-wrap: wrap;
  gap: 1.2rem;
  align-items: center;
  padding: 2rem 0;
  margin-top: 4rem;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.7rem;
  border-top: 1px solid var(--line);
}

body > .site-footer {
  max-width: calc(var(--content-width) - 4rem);
  margin-right: auto;
  margin-left: auto;
}

.site-footer span {
  margin-right: auto;
}

.site-footer a:hover {
  color: var(--transit-teal);
}

.search-dialog {
  width: min(46rem, calc(100vw - 2rem));
  max-height: min(42rem, calc(100vh - 4rem));
  padding: 0;
  overflow: hidden;
  color: var(--ink);
  background: var(--paper);
  border: 1px solid var(--line-strong);
  border-radius: 3px;
  box-shadow: 0 28px 100px rgb(6 25 33 / 35%);
}

.search-dialog::backdrop {
  background: rgb(7 25 32 / 64%);
  backdrop-filter: blur(4px);
}

.search-frame {
  display: grid;
  grid-template-rows: auto auto minmax(0, 1fr);
  max-height: min(42rem, calc(100vh - 4rem));
}

.search-header {
  display: flex;
  gap: 0.8rem;
  align-items: center;
  padding: 1rem;
  color: var(--slate);
  border-bottom: 1px solid var(--line);
}

.search-header input {
  flex: 1;
  min-width: 0;
  padding: 0;
  color: var(--packet-navy);
  font-size: 1.08rem;
  background: transparent;
  border: 0;
  outline: 0;
}

.search-header input::placeholder {
  color: #83969c;
}

.search-close {
  padding: 0.2rem 0.4rem;
  color: var(--slate);
  font-family: var(--mono);
  font-size: 0.64rem;
  cursor: pointer;
  background: var(--porcelain);
  border: 1px solid var(--line);
}

.search-help,
.search-empty {
  padding: 0.85rem 1rem;
  color: var(--muted);
  font-size: 0.85rem;
  border-bottom: 1px solid var(--line);
}

.search-results {
  overflow-y: auto;
}

.search-result {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 0.2rem 1rem;
  padding: 0.9rem 1rem;
  text-decoration: none;
  border-bottom: 1px solid var(--line);
}

.search-result:hover,
.search-result.is-selected {
  background: #edf5f4;
}

.search-result strong {
  color: var(--packet-navy);
}

.search-result .result-category {
  color: var(--transit-teal);
  font-family: var(--mono);
  font-size: 0.61rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.search-result p {
  grid-column: 1 / -1;
  margin: 0.15rem 0 0;
  color: var(--muted);
  font-size: 0.84rem;
  line-height: 1.35;
}

.mobile-nav-backdrop {
  display: none;
}

.home-mobile-navigation {
  display: none;
}

@media (max-width: 74rem) {
  .docs-layout {
    grid-template-columns: 15.5rem minmax(0, var(--reading-width));
  }

  .page-toc {
    display: none;
  }

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

  .path-card:nth-child(2) {
    border-right: 0;
  }

  .path-card:nth-child(3),
  .path-card:nth-child(4) {
    border-top: 1px solid var(--line);
  }

  .path-card:nth-child(3) {
    padding-left: 0;
  }
}

@media (max-width: 60rem) {
  .site-header {
    padding: 0 1.2rem;
  }

  .search-trigger {
    min-width: 2.7rem;
    width: 2.7rem;
    height: 2.7rem;
    justify-content: center;
    padding: 0;
  }

  .search-trigger span,
  .search-trigger kbd {
    display: none;
  }

  .menu-trigger {
    display: block;
  }

  body.menu-open .menu-trigger i:first-of-type {
    transform: translateY(0.2rem) rotate(45deg);
  }

  body.menu-open .menu-trigger i:last-of-type {
    transform: translateY(-0.2rem) rotate(-45deg);
  }

  .hero {
    grid-template-columns: 1fr;
    padding-top: 5rem;
  }

  .hero h1 {
    max-width: 9ch;
  }

  .route-console {
    min-height: auto;
  }

  .docs-layout {
    display: block;
    padding: 0 1.4rem;
  }

  .home-mobile-navigation {
    display: block;
  }

  .doc-nav {
    position: fixed;
    z-index: 45;
    top: var(--header-height);
    bottom: 0;
    left: 0;
    width: min(20rem, calc(100vw - 3rem));
    max-height: none;
    padding: 1.5rem;
    background: var(--paper);
    box-shadow: 16px 0 40px rgb(16 40 50 / 18%);
    transform: translateX(-105%);
    transition: transform 180ms ease;
  }

  body.menu-open .doc-nav {
    transform: translateX(0);
  }

  .mobile-nav-backdrop {
    position: fixed;
    z-index: 40;
    inset: var(--header-height) 0 0;
    display: block;
    pointer-events: none;
    background: rgb(7 25 32 / 50%);
    opacity: 0;
    transition: opacity 180ms ease;
  }

  body.menu-open .mobile-nav-backdrop {
    pointer-events: auto;
    opacity: 1;
  }

  .doc-main {
    max-width: var(--reading-width);
    margin: 0 auto;
  }

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

  .protocol-grid article,
  .protocol-grid article + article {
    padding: 2rem 0;
    border-right: 0;
    border-bottom: 1px solid rgb(122 212 223 / 18%);
  }

  .protocol-grid article:last-child {
    border-bottom: 0;
  }

  .protocol-grid p {
    min-height: 0;
  }

  .boundary-callout {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 42rem) {
  .brand small,
  .github-link {
    display: none;
  }

  .hero,
  .home-section {
    padding-right: 1.2rem;
    padding-left: 1.2rem;
  }

  .hero {
    gap: 3.5rem;
    min-height: 0;
  }

  .hero h1 {
    font-size: clamp(3.6rem, 18vw, 5rem);
  }

  .hero-actions,
  .button-primary,
  .button-secondary {
    width: 100%;
  }

  .section-heading,
  .quick-command {
    grid-template-columns: 1fr;
  }

  .section-heading {
    gap: 0;
  }

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

  .path-card,
  .path-card + .path-card,
  .path-card:nth-child(3) {
    padding: 1.5rem 0;
    border-top: 1px solid var(--line);
    border-right: 0;
  }

  .path-card p {
    min-height: 0;
  }

  .quick-command > a {
    grid-column: 1;
  }

  .trace-path {
    grid-template-columns: minmax(0, 1fr) 3rem;
  }

  .trace-link {
    grid-template-columns: 1fr 3rem;
  }

  .prose {
    font-size: 1rem;
  }

  .prose h1 {
    font-size: 3.4rem;
  }

  .prose h2 {
    font-size: 2rem;
  }

  .mermaid-diagram {
    padding: 0.8rem;
  }

  .doc-kicker a {
    display: none;
  }

  .page-pager {
    grid-template-columns: 1fr;
  }

  .pager-next {
    text-align: left;
  }

  .site-footer span {
    flex-basis: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

@media print {
  .site-header,
  .doc-nav,
  .page-toc,
  .page-pager,
  .search-dialog,
  .copy-code,
  .doc-kicker a {
    display: none !important;
  }

  body {
    background: #fff;
  }

  .docs-layout {
    display: block;
    max-width: none;
  }

  .doc-main {
    padding: 0;
  }

  .prose a {
    color: inherit;
  }
}