:root {
  --bg: #07101d;
  --bg-soft: #0c1728;
  --panel: #101d30;
  --panel-strong: #142640;
  --text: #f6f1e8;
  --muted: #bdc8d6;
  --line: #24364d;
  --blue: #45d0ff;
  --blue-soft: #94e2ff;
  --gold: #f0c35c;
  --green: #86e0b0;
  --shadow: 0 24px 80px rgba(0, 0, 0, 0.28);
  color-scheme: dark;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 320px;
  background:
    linear-gradient(180deg, rgba(69, 208, 255, 0.08), transparent 420px),
    var(--bg);
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 16px;
  line-height: 1.6;
}

a {
  color: var(--blue-soft);
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.18em;
}

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

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

.skip-link {
  left: 1rem;
  position: absolute;
  top: -5rem;
  z-index: 20;
  background: var(--gold);
  color: #07101d;
  padding: 0.6rem 0.9rem;
  border-radius: 6px;
  font-weight: 700;
}

.skip-link:focus {
  top: 1rem;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  border-bottom: 1px solid rgba(148, 226, 255, 0.14);
  background: rgba(7, 16, 29, 0.92);
  backdrop-filter: blur(16px);
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  width: min(1120px, calc(100% - 2rem));
  margin: 0 auto;
  padding: 0.8rem 0;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  color: var(--text);
  text-decoration: none;
  font-weight: 800;
  letter-spacing: 0;
}

.brand-mark {
  width: 2rem;
  height: 2rem;
  border: 1px solid rgba(69, 208, 255, 0.45);
  display: grid;
  place-items: center;
  background: #0a1626;
}

.brand-mark svg {
  width: 1.35rem;
  height: 1.35rem;
}

.nav-toggle {
  display: none;
  width: 2.6rem;
  height: 2.6rem;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--panel);
  color: var(--text);
  cursor: pointer;
}

.nav-toggle span,
.nav-toggle span::before,
.nav-toggle span::after {
  display: block;
  width: 1.15rem;
  height: 2px;
  margin: 0 auto;
  background: currentColor;
  content: "";
}

.nav-toggle span::before {
  transform: translateY(-7px);
}

.nav-toggle span::after {
  transform: translateY(5px);
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.site-nav a {
  color: var(--muted);
  text-decoration: none;
  padding: 0.55rem 0.7rem;
  border-radius: 6px;
  font-weight: 650;
  font-size: 0.95rem;
}

.site-nav a:hover,
.site-nav a[aria-current="page"] {
  background: rgba(69, 208, 255, 0.1);
  color: var(--text);
}

main {
  overflow: hidden;
}

.section,
.hero {
  width: min(1120px, calc(100% - 2rem));
  margin: 0 auto;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(320px, 0.92fr);
  gap: 3rem;
  align-items: center;
  min-height: 72vh;
  padding: 5rem 0 4rem;
}

.hero-content {
  max-width: 680px;
}

.eyebrow {
  margin: 0 0 0.9rem;
  color: var(--blue-soft);
  font-size: 0.88rem;
  font-weight: 750;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

h1,
h2,
h3 {
  margin: 0;
  line-height: 1.1;
  letter-spacing: 0;
}

h1 {
  font-size: clamp(3.2rem, 8vw, 6.8rem);
  font-weight: 900;
}

.hero h2 {
  margin-top: 0.25rem;
  font-size: clamp(1.45rem, 3vw, 2.4rem);
  color: #ffffff;
}

.lead {
  max-width: 760px;
  margin: 1.25rem 0 0;
  color: var(--muted);
  font-size: clamp(1.08rem, 1.9vw, 1.35rem);
}

.status-line {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  margin-top: 1.5rem;
  color: var(--text);
  font-weight: 750;
}

.status-line::before {
  width: 0.65rem;
  height: 0.65rem;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 0 0.35rem rgba(134, 224, 176, 0.14);
  content: "";
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin-top: 2rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.9rem;
  padding: 0.72rem 1.05rem;
  border: 1px solid rgba(69, 208, 255, 0.35);
  border-radius: 7px;
  background: rgba(69, 208, 255, 0.11);
  color: var(--text);
  text-decoration: none;
  font-weight: 800;
}

.button.primary {
  border-color: var(--blue);
  background: var(--blue);
  color: #06101c;
}

.button.accent {
  border-color: rgba(240, 195, 92, 0.7);
  background: rgba(240, 195, 92, 0.14);
}

.hero-panel {
  position: relative;
  border: 1px solid rgba(148, 226, 255, 0.16);
  background: linear-gradient(180deg, rgba(20, 38, 64, 0.92), rgba(12, 23, 40, 0.92));
  box-shadow: var(--shadow);
  padding: 1.4rem;
}

.hero-panel::before {
  position: absolute;
  inset: 0.9rem;
  border: 1px solid rgba(240, 195, 92, 0.14);
  pointer-events: none;
  content: "";
}

.signal-map {
  position: relative;
  min-height: 340px;
  display: grid;
  place-items: center;
}

.signal-map svg {
  width: 100%;
  height: auto;
}

.map-label {
  position: absolute;
  left: 1.2rem;
  bottom: 1.2rem;
  right: 1.2rem;
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.section {
  padding: 4.2rem 0;
}

.section-header {
  max-width: 780px;
  margin-bottom: 1.8rem;
}

.section-header h2 {
  font-size: clamp(2rem, 4vw, 3.2rem);
}

.section-header p {
  margin: 1rem 0 0;
  color: var(--muted);
  font-size: 1.08rem;
}

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

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

.card,
.notice,
.step,
.table-wrap {
  border: 1px solid rgba(148, 226, 255, 0.14);
  border-radius: 8px;
  background: rgba(16, 29, 48, 0.82);
}

.card {
  padding: 1.25rem;
}

.card h3 {
  color: #ffffff;
  font-size: 1.15rem;
}

.card p {
  margin: 0.7rem 0 0;
  color: var(--muted);
}

.intro-panel {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 2rem;
  align-items: center;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 2.4rem 0;
}

.intro-panel p {
  margin: 0;
  color: var(--muted);
  font-size: 1.08rem;
}

.diagram-card {
  margin: 0;
}

.diagram-card img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid rgba(148, 226, 255, 0.12);
}

.diagram-card figcaption {
  margin-top: 0.75rem;
  color: var(--muted);
  font-size: 0.95rem;
}

.backbone {
  width: 100%;
  background: #0a1424;
  border-top: 1px solid rgba(148, 226, 255, 0.12);
  border-bottom: 1px solid rgba(148, 226, 255, 0.12);
}

.backbone-inner {
  width: min(1120px, calc(100% - 2rem));
  margin: 0 auto;
  padding: 4.2rem 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  align-items: start;
}

.big-copy {
  color: var(--text);
  font-size: clamp(1.35rem, 2.4vw, 2rem);
  line-height: 1.32;
  font-weight: 760;
  margin: 1rem 0 0;
}

.location-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.7rem;
  margin: 1.2rem 0 0;
  padding: 0;
  list-style: none;
}

.location-list li {
  border-left: 3px solid var(--gold);
  background: rgba(240, 195, 92, 0.08);
  padding: 0.7rem 0.8rem;
  color: var(--text);
}

.notice {
  padding: 1.2rem;
  border-color: rgba(240, 195, 92, 0.32);
  background: rgba(240, 195, 92, 0.09);
}

.notice p {
  margin: 0;
  color: var(--text);
}

.steps {
  display: grid;
  gap: 0.85rem;
  counter-reset: steps;
}

.step {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 1rem;
  padding: 1rem;
  counter-increment: steps;
}

.step::before {
  display: grid;
  place-items: center;
  width: 2.2rem;
  height: 2.2rem;
  border-radius: 50%;
  background: var(--blue);
  color: #06101c;
  font-weight: 900;
  content: counter(steps);
}

.step h3 {
  font-size: 1.08rem;
}

.step p {
  margin: 0.35rem 0 0;
  color: var(--muted);
}

.role-strip {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
  margin-top: 1.5rem;
}

.table-wrap {
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  min-width: 720px;
}

th,
td {
  padding: 0.9rem 1rem;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

th {
  color: #ffffff;
  background: rgba(69, 208, 255, 0.08);
}

td {
  color: var(--muted);
}

.public-list {
  margin: 1rem 0 0;
  padding-left: 1.2rem;
  color: var(--muted);
}

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

.site-footer {
  border-top: 1px solid rgba(148, 226, 255, 0.14);
  background: #050b14;
}

.footer-inner {
  width: min(1120px, calc(100% - 2rem));
  margin: 0 auto;
  padding: 2rem 0;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 2rem;
}

.footer-inner p {
  margin: 0.4rem 0 0;
  color: var(--muted);
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem 1rem;
  justify-content: flex-end;
}

.external::after {
  content: " ↗";
}

@media (max-width: 860px) {
  .nav-toggle {
    display: block;
  }

  .site-nav {
    display: none;
    position: absolute;
    left: 1rem;
    right: 1rem;
    top: 4.3rem;
    flex-direction: column;
    align-items: stretch;
    padding: 0.6rem;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: #08111f;
    box-shadow: var(--shadow);
  }

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

  .hero,
  .intro-panel,
  .backbone-inner,
  .footer-inner {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
    padding: 3.2rem 0 2.8rem;
  }

  .hero-panel {
    order: -1;
  }

  .signal-map {
    min-height: 260px;
  }

  .grid,
  .grid.two,
  .role-strip {
    grid-template-columns: 1fr;
  }

  .footer-links {
    justify-content: flex-start;
  }
}

@media (max-width: 560px) {
  .section,
  .backbone-inner {
    padding: 3rem 0;
  }

  .button-row {
    flex-direction: column;
  }

  .button {
    width: 100%;
  }

  .location-list {
    grid-template-columns: 1fr;
  }
}