:root {
  --deep: #0B2239;
  --panel: #123A5A;
  --signal: #17B8B0;
  --aqua: #A8E6E1;
  --warm: #F26B38;
  --peach: #FFC2A6;
  --sand: #F4EFE6;
  --paper: #FCFAF6;
  --ink: #101820;
  --muted: #64748B;
  --line: rgba(11, 34, 57, .16);
  --line-light: rgba(252, 250, 246, .16);
  --frame: rgba(168, 230, 225, .24);
  --shadow: 0 24px 60px rgba(11, 34, 57, .14);
  --font-title: 'HarmonyOS Sans SC Narrow', 'Source Han Sans SC', 'PingFang SC', sans-serif;
  --font-body: 'Source Han Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-mono: 'JetBrains Mono', 'IBM Plex Mono', 'SFMono-Regular', Consolas, monospace;
  --max: 1240px;
  --gutter: clamp(18px, 4vw, 56px);
  --header-h: 78px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  margin: 0;
  background-color: var(--paper);
  background-image:
    linear-gradient(rgba(11, 34, 57, .035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(11, 34, 57, .035) 1px, transparent 1px);
  background-size: 56px 56px;
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.8;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

img,
svg,
video {
  display: block;
  max-width: 100%;
}

button,
input,
select,
textarea {
  font: inherit;
}

button {
  cursor: pointer;
}

a {
  color: var(--panel);
  text-underline-offset: .18em;
}

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

p {
  margin: 0 0 1em;
  max-width: 72ch;
}

ul,
ol {
  margin: 0;
  padding-left: 1.2em;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  margin: 0 0 .45em;
  color: var(--deep);
  font-family: var(--font-title);
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: -.025em;
}

h1 {
  font-size: clamp(2.8rem, 7vw, 6.8rem);
}

h2 {
  font-size: clamp(1.8rem, 4vw, 3.6rem);
}

h3 {
  font-size: clamp(1.25rem, 2vw, 1.75rem);
}

strong {
  font-weight: 800;
}

::selection {
  background: var(--signal);
  color: var(--deep);
}

:where(a, button, summary, input, select, textarea, [tabindex]):focus-visible {
  outline: 2px solid var(--warm);
  outline-offset: 3px;
}

#main-content {
  scroll-margin-top: calc(var(--header-h) + 18px);
}

.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: .02em;
}

.shell {
  width: min(100%, var(--max));
  margin-inline: auto;
  padding-inline: var(--gutter);
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--deep);
  color: var(--paper);
  border-top: 2px solid var(--signal);
  border-bottom: 1px solid var(--line-light);
}

.reading-progress {
  position: fixed;
  inset: 0 0 auto;
  z-index: 250;
  height: 2px;
  pointer-events: none;
  background: transparent;
}

.reading-progress__bar {
  display: block;
  width: 100%;
  height: 100%;
  background: var(--signal);
  transform: scaleX(var(--progress, 0));
  transform-origin: 0 50%;
  transition: transform .12s linear;
}

.skip-link {
  position: fixed;
  top: -100%;
  left: var(--gutter);
  z-index: 300;
  padding: 10px 14px;
  background: var(--aqua);
  border: 1px solid var(--deep);
  color: var(--deep);
  font-family: var(--font-mono);
  font-size: .8rem;
  text-decoration: none;
  transition: top .15s ease;
}

.skip-link:focus {
  top: 12px;
}

.header-rail {
  position: relative;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: clamp(12px, 2vw, 28px);
  width: min(100%, var(--max));
  min-height: var(--header-h);
  margin-inline: auto;
  padding-inline: var(--gutter);
  border-inline: 1px solid var(--frame);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
  color: var(--paper);
  text-decoration: none;
}

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

.brand-mark {
  position: relative;
  display: grid;
  flex: none;
  place-items: center;
  width: 40px;
  height: 40px;
  background: rgba(23, 184, 176, .07);
  border: 1px solid var(--signal);
  color: var(--aqua);
  font-family: var(--font-mono);
  font-size: .82rem;
  font-weight: 700;
  letter-spacing: .08em;
}

.brand-mark::after {
  content: "";
  position: absolute;
  right: -1px;
  bottom: -1px;
  width: 9px;
  height: 9px;
  border-right: 1px solid var(--warm);
  border-bottom: 1px solid var(--warm);
}

.brand-copy {
  display: grid;
  gap: 1px;
  min-width: 0;
  line-height: 1.1;
}

.brand-name {
  overflow: hidden;
  color: var(--paper);
  font-family: var(--font-title);
  font-size: 1.05rem;
  font-weight: 900;
  letter-spacing: -.02em;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.brand-sub {
  overflow: hidden;
  color: var(--aqua);
  font-family: var(--font-mono);
  font-size: .64rem;
  letter-spacing: .12em;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.site-nav {
  min-width: 0;
}

.nav-list {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: clamp(0px, .8vw, 10px);
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: nav-index;
}

.nav-item {
  min-width: 0;
  counter-increment: nav-index;
}

.nav-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 7px;
  border-bottom: 1px solid transparent;
  color: rgba(252, 250, 246, .76);
  font-size: .82rem;
  font-weight: 600;
  line-height: 1;
  text-decoration: none;
  transition: color .15s, border-color .15s, background-color .15s;
}

.nav-link::before {
  content: counter(nav-index, decimal-leading-zero);
  color: var(--signal);
  font-family: var(--font-mono);
  font-size: .6rem;
  font-weight: 500;
  opacity: .7;
}

.nav-link:hover {
  color: var(--paper);
  border-bottom-color: var(--aqua);
}

.nav-link[aria-current="page"] {
  background: rgba(23, 184, 176, .08);
  border-bottom-color: var(--signal);
  color: var(--aqua);
}

.nav-link[aria-current="page"]::before {
  color: var(--warm);
  opacity: 1;
}

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

.header-actions {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: clamp(8px, 1.5vw, 18px);
}

.header-status {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--aqua);
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .08em;
  white-space: nowrap;
}

.status-dot {
  flex: none;
  width: 7px;
  height: 7px;
  background: var(--signal);
  border-radius: 50%;
  box-shadow: 0 0 0 4px rgba(23, 184, 176, .14);
}

.header-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 38px;
  padding: 8px 14px;
  background: var(--warm);
  border: 1px solid var(--warm);
  border-radius: 1px;
  color: var(--ink);
  font-size: .82rem;
  font-weight: 800;
  text-decoration: none;
  white-space: nowrap;
  transition: background-color .15s, border-color .15s;
}

.header-cta:hover {
  background: #e25a2d;
  border-color: #e25a2d;
  color: var(--ink);
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  padding: 8px 10px;
  background: transparent;
  border: 1px solid var(--frame);
  border-radius: 1px;
  color: var(--aqua);
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .08em;
  line-height: 1;
}

.nav-toggle:hover {
  border-color: var(--signal);
  color: var(--paper);
}

.nav-toggle-label {
  display: inline-block;
}

.nav-toggle-lines {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
  width: 18px;
}

.nav-toggle-lines span {
  display: block;
  width: 18px;
  height: 2px;
  background: currentColor;
  transition: transform .18s, opacity .18s;
}

.site-header[data-open] .nav-toggle-lines span:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

.site-header[data-open] .nav-toggle-lines span:nth-child(2) {
  opacity: 0;
}

.site-header[data-open] .nav-toggle-lines span:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

/* Footer */
.site-footer {
  position: relative;
  overflow: hidden;
  padding-block: clamp(48px, 7vw, 86px) 24px;
  background-color: var(--deep);
  background-image:
    linear-gradient(rgba(168, 230, 225, .055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(168, 230, 225, .055) 1px, transparent 1px);
  background-size: 46px 46px;
  border-top: 2px solid var(--signal);
  color: rgba(252, 250, 246, .82);
}

.site-footer::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(115deg, transparent 0 64%, rgba(23, 184, 176, .06) 64% 65%, transparent 65%);
}

.footer-grid {
  position: relative;
  display: grid;
  grid-template-columns: minmax(220px, 1.05fr) minmax(320px, 1.7fr) minmax(240px, .95fr);
  align-items: start;
  gap: clamp(28px, 5vw, 72px);
  width: min(100%, var(--max));
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.footer-brand {
  display: grid;
  align-content: start;
  gap: 12px;
}

.footer-brand-name {
  margin: 0;
  color: var(--paper);
  font-family: var(--font-title);
  font-size: clamp(1.6rem, 2.8vw, 2.5rem);
  font-weight: 900;
  line-height: 1;
  letter-spacing: -.035em;
}

.footer-brand-sub {
  margin: 0;
  color: var(--aqua);
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .1em;
}

.footer-tagline {
  max-width: 26ch;
  margin: 0;
  color: rgba(252, 250, 246, .72);
  font-size: .95rem;
  line-height: 1.75;
}

.footer-route-note {
  margin: 8px 0 0;
  padding-top: 10px;
  border-top: 1px solid var(--line-light);
  color: rgba(252, 250, 246, .4);
  font-size: .64rem;
  letter-spacing: .12em;
}

.footer-columns {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(16px, 3vw, 32px);
}

.footer-column {
  min-width: 0;
}

.footer-heading {
  margin: 0 0 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--line-light);
  color: var(--signal);
  font-family: var(--font-mono);
  font-size: .68rem;
  font-weight: 600;
  letter-spacing: .14em;
  text-transform: uppercase;
}

.footer-links {
  display: grid;
  gap: 4px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.footer-links a {
  display: inline-flex;
  width: fit-content;
  padding: 3px 0;
  border-bottom: 1px solid transparent;
  color: rgba(252, 250, 246, .76);
  font-size: .9rem;
  text-decoration: none;
  transition: color .15s, border-color .15s;
}

.footer-links a:hover {
  border-bottom-color: var(--signal);
  color: var(--aqua);
}

.footer-contact {
  min-width: 0;
}

.contact-list {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.contact-item {
  display: grid;
  gap: 2px;
  min-width: 0;
}

.contact-label {
  color: var(--signal);
  font-family: var(--font-mono);
  font-size: .64rem;
  letter-spacing: .12em;
}

.contact-value {
  overflow-wrap: anywhere;
  color: rgba(252, 250, 246, .82);
  font-size: .86rem;
  line-height: 1.55;
}

.contact-note {
  max-width: 34ch;
  margin: 16px 0 0;
  padding-left: 12px;
  border-left: 2px solid var(--warm);
  color: rgba(252, 250, 246, .58);
  font-size: .78rem;
  line-height: 1.7;
}

.footer-bottom {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  width: min(100%, var(--max));
  margin: clamp(36px, 5vw, 58px) auto 0;
  padding: 18px var(--gutter) 0;
  border-top: 1px solid var(--line-light);
}

.footer-legal {
  max-width: none;
  margin: 0;
  color: rgba(252, 250, 246, .55);
  font-size: .74rem;
  line-height: 1.6;
}

.footer-legal .mono {
  color: rgba(252, 250, 246, .72);
}

.footer-status {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0;
  color: rgba(252, 250, 246, .55);
  font-family: var(--font-mono);
  font-size: .64rem;
  letter-spacing: .08em;
}

/* Shared layout and components */
.section {
  padding-block: clamp(48px, 7vw, 96px);
}

.section--sand {
  background: var(--sand);
  border-block: 1px solid rgba(11, 34, 57, .08);
}

.section--deep {
  background: var(--deep);
  border-block: 1px solid rgba(23, 184, 176, .22);
  color: rgba(252, 250, 246, .86);
}

.section-head {
  display: grid;
  grid-template-columns: minmax(160px, .6fr) minmax(0, 2fr);
  align-items: start;
  gap: clamp(18px, 4vw, 60px);
  margin-bottom: clamp(24px, 4vw, 48px);
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  width: fit-content;
  margin: 0 0 12px;
  color: var(--panel);
  font-family: var(--font-mono);
  font-size: .72rem;
  font-weight: 600;
  letter-spacing: .12em;
  text-transform: uppercase;
}

.eyebrow::before {
  content: "";
  width: 24px;
  height: 1px;
  background: var(--signal);
}

.section--deep .eyebrow {
  color: var(--aqua);
}

.display-title {
  max-width: 12ch;
  margin: 0;
  color: var(--deep);
  font-size: clamp(2.8rem, 7vw, 6.8rem);
  line-height: .96;
  letter-spacing: -.04em;
}

.section-title {
  max-width: 15ch;
  margin: 0;
  color: var(--deep);
  font-size: clamp(1.8rem, 4vw, 3.6rem);
}

.lead {
  max-width: 62ch;
  margin: 0;
  color: var(--panel);
  font-size: clamp(1.05rem, 1.6vw, 1.25rem);
  line-height: 1.85;
}

.body-copy {
  max-width: 68ch;
  color: var(--ink);
  font-size: 1rem;
  line-height: 1.82;
}

.body-copy p:last-child {
  margin-bottom: 0;
}

.section--deep .display-title,
.section--deep .section-title,
.section--deep .body-copy h1,
.section--deep .body-copy h2,
.section--deep .body-copy h3 {
  color: var(--paper);
}

.section--deep .lead,
.section--deep .body-copy {
  color: rgba(252, 250, 246, .78);
}

.status-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  width: fit-content;
  padding: 3px 8px;
  background: var(--aqua);
  border: 1px solid rgba(11, 34, 57, .16);
  color: var(--deep);
  font-family: var(--font-mono);
  font-size: .68rem;
  line-height: 1.4;
  letter-spacing: .06em;
  text-transform: uppercase;
}

.status-tag--warm {
  background: var(--peach);
  border-color: rgba(242, 107, 56, .45);
  color: var(--ink);
}

.status-tag--quiet {
  background: transparent;
  border-color: var(--line);
  color: var(--muted);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 42px;
  padding: 9px 16px;
  background: var(--panel);
  border: 1px solid var(--panel);
  border-radius: 1px;
  color: var(--paper);
  font-family: var(--font-body);
  font-size: .9rem;
  font-weight: 800;
  line-height: 1.2;
  text-decoration: none;
  cursor: pointer;
  transition: background-color .15s, color .15s, border-color .15s;
}

.btn:hover {
  background: var(--deep);
  border-color: var(--deep);
  color: var(--paper);
}

.btn--primary {
  background: var(--signal);
  border-color: var(--signal);
  color: var(--deep);
}

.btn--primary:hover {
  background: #119d96;
  border-color: #119d96;
  color: var(--deep);
}

.btn--ghost {
  background: transparent;
  border-color: var(--line);
  color: var(--panel);
}

.btn--ghost:hover {
  background: var(--aqua);
  border-color: var(--aqua);
  color: var(--deep);
}

.btn--warm {
  background: var(--warm);
  border-color: var(--warm);
  color: var(--ink);
}

.btn--warm:hover {
  background: #e25a2d;
  border-color: #e25a2d;
  color: var(--ink);
}

.breadcrumb {
  margin: 0 0 24px;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: .72rem;
}

.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.breadcrumb li {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.breadcrumb li + li::before {
  content: "/";
  color: var(--signal);
}

.breadcrumb a {
  color: var(--panel);
  text-decoration: none;
}

.breadcrumb a:hover {
  color: var(--signal);
}

.route-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 240px), 1fr));
  gap: clamp(14px, 2vw, 24px);
}

.route-card {
  position: relative;
  display: flex;
  flex-direction: column;
  min-height: 180px;
  overflow: hidden;
  padding: 22px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-top: 3px solid var(--signal);
  color: var(--ink);
  text-decoration: none;
  transition: border-color .18s, background-color .18s;
}

.route-card::after {
  content: "";
  position: absolute;
  right: 18px;
  bottom: 18px;
  width: 44px;
  height: 1px;
  pointer-events: none;
  background: var(--warm);
  transform: scaleX(.25);
  transform-origin: right;
  transition: transform .2s;
}

.route-card:hover,
.route-card:focus-visible {
  background: #fffefb;
  border-color: var(--signal);
}

.route-card:hover::after,
.route-card:focus-visible::after {
  transform: scaleX(1);
}

.route-card__index {
  margin-bottom: auto;
  color: var(--signal);
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .1em;
}

.route-card__title {
  margin: 18px 0 8px;
  color: var(--deep);
  font-family: var(--font-title);
  font-size: 1.35rem;
  font-weight: 900;
  line-height: 1.15;
}

.route-card__desc {
  max-width: 32ch;
  margin: 0;
  color: var(--muted);
  font-size: .88rem;
  line-height: 1.7;
}

.route-card__hint {
  margin-top: 16px;
  padding-top: 10px;
  border-top: 1px solid var(--line);
  color: var(--panel);
  font-family: var(--font-mono);
  font-size: .66rem;
  letter-spacing: .04em;
}

.archive-list {
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
  list-style: none;
}

.archive-item {
  display: grid;
  grid-template-columns: minmax(86px, 120px) minmax(0, 1fr) auto;
  align-items: baseline;
  gap: 18px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}

.archive-item:hover {
  background: rgba(244, 239, 230, .7);
}

.archive-meta {
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .06em;
}

.archive-title {
  margin: 0;
  color: var(--deep);
  font-size: 1rem;
  font-weight: 700;
}

.archive-title a {
  color: inherit;
  text-decoration: none;
}

.archive-title a:hover {
  color: var(--signal);
}

.step-list {
  display: grid;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: step-index;
}

.step-item {
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr);
  gap: 16px;
  padding: 20px 0;
  border-top: 1px solid var(--line);
}

.step-index {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  background: rgba(168, 230, 225, .18);
  border: 1px solid var(--signal);
  color: var(--panel);
  font-family: var(--font-mono);
  font-size: .72rem;
}

.step-body {
  min-width: 0;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: .9rem;
  line-height: 1.65;
}

.data-table caption {
  padding-bottom: 8px;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: .68rem;
  text-align: left;
}

.data-table th,
.data-table td {
  padding: 11px 12px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

.data-table th {
  background: rgba(168, 230, 225, .16);
  color: var(--panel);
  font-family: var(--font-mono);
  font-size: .68rem;
  font-weight: 600;
  letter-spacing: .08em;
}

.data-table tbody tr:nth-child(even) {
  background: var(--sand);
}

.media-frame {
  position: relative;
  aspect-ratio: 16 / 9;
  margin: 0;
  overflow: hidden;
  background-color: var(--panel);
  background-image:
    linear-gradient(rgba(168, 230, 225, .14) 1px, transparent 1px),
    linear-gradient(90deg, rgba(168, 230, 225, .14) 1px, transparent 1px);
  background-size: 32px 32px;
  border: 1px solid var(--line);
}

.media-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media-frame figcaption {
  position: absolute;
  bottom: 0;
  left: 0;
  max-width: calc(100% - 24px);
  padding: 6px 10px;
  background: rgba(11, 34, 57, .86);
  color: var(--aqua);
  font-family: var(--font-mono);
  font-size: .66rem;
  line-height: 1.5;
}

.media-frame--wide {
  aspect-ratio: 21 / 9;
}

.media-frame--square {
  aspect-ratio: 1 / 1;
}

.section-index {
  position: sticky;
  top: calc(var(--header-h) + 18px);
  display: grid;
  align-self: start;
  gap: 2px;
  padding-left: 12px;
  border-left: 1px solid var(--line);
}

.section-index__link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 4px 0;
  border-bottom: 1px solid transparent;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: .7rem;
  text-decoration: none;
}

.section-index__link:hover {
  border-bottom-color: var(--signal);
  color: var(--panel);
}

.section-index__link[aria-current="true"] {
  color: var(--deep);
  font-weight: 700;
}

.section-index__link[aria-current="true"]::before {
  content: "";
  width: 14px;
  height: 1px;
  background: var(--warm);
}

@media (max-width: 1180px) {
  .header-status {
    display: none;
  }

  .nav-link {
    padding-inline: 5px;
    font-size: .78rem;
  }
}

@media (max-width: 1000px) {
  .footer-grid {
    grid-template-columns: 1fr 1.6fr;
  }

  .footer-contact {
    grid-column: 1 / -1;
    max-width: 640px;
  }
}

@media (max-width: 860px) {
  .header-rail {
    grid-template-columns: minmax(0, 1fr) auto;
    width: min(100%, var(--max));
    min-height: 68px;
    padding-inline: 14px;
    border-inline: 0;
  }

  .site-nav {
    position: absolute;
    top: calc(100% + 1px);
    right: 0;
    left: 0;
    z-index: 120;
    display: none;
    max-height: calc(100vh - var(--header-h) - 20px);
    overflow: auto;
    padding: 12px;
    background: var(--panel);
    border: 1px solid var(--signal);
    box-shadow: var(--shadow);
  }

  .site-header[data-open] .site-nav {
    display: block;
  }

  .nav-list {
    display: grid;
    gap: 0;
  }

  .nav-item {
    border-bottom: 1px solid var(--line-light);
  }

  .nav-link {
    width: 100%;
    justify-content: flex-start;
    padding: 14px 6px;
    border-bottom: 0;
    font-size: .98rem;
  }

  .nav-link::before {
    min-width: 20px;
    font-size: .66rem;
  }

  .nav-link[aria-current="page"] {
    background: rgba(23, 184, 176, .12);
  }

  .nav-mobile-cta {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 46px;
    margin-top: 14px;
    background: var(--warm);
    border: 1px solid var(--warm);
    color: var(--ink);
    font-weight: 800;
    text-decoration: none;
  }

  .nav-mobile-cta:hover {
    background: #e25a2d;
    color: var(--ink);
  }

  .header-cta {
    display: none;
  }

  .header-status {
    display: inline-flex;
    font-size: .62rem;
  }

  .nav-toggle {
    display: inline-flex;
  }

  .header-actions {
    gap: 10px;
  }

  .section-head {
    grid-template-columns: 1fr;
    gap: 14px;
  }

  .display-title {
    max-width: 14ch;
  }

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

  .footer-contact {
    grid-column: auto;
  }

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

  .contact-note {
    max-width: 48ch;
  }
}

@media (max-width: 540px) {
  .brand-mark {
    width: 34px;
    height: 34px;
    font-size: .74rem;
  }

  .brand-name {
    font-size: .95rem;
  }

  .brand-sub {
    font-size: .56rem;
    letter-spacing: .08em;
  }

  .header-status {
    display: none;
  }

  .header-rail {
    min-height: 62px;
  }

  .nav-toggle-label {
    display: none;
  }

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

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
  }

  .archive-item {
    grid-template-columns: 1fr;
    gap: 4px;
  }

  .step-item {
    grid-template-columns: 42px minmax(0, 1fr);
    gap: 12px;
  }
}

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

  *,
  *::before,
  *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }

  .reading-progress__bar {
    transition: none;
  }

  .route-card::after {
    transition: none;
  }
}