:root {
  color-scheme: dark;
  --cobalt: #245bff;
  --cobalt-deep: #102fba;
  --midnight: #060b1a;
  --ink: #f4f7ff;
  --cyan: #70e1ff;
  --quiet: #aebee3;
  --rule: rgba(244, 247, 255, 0.24);
  --panel: rgba(6, 11, 26, 0.74);
  --signal: #c8ff39;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  --mono: ui-monospace, "SFMono-Regular", "SF Mono", Menlo, Consolas, monospace;
  --gutter: clamp(1.25rem, 4.5vw, 5rem);
  --ease: cubic-bezier(0.2, 0.7, 0.2, 1);
  font-family: var(--sans);
  background: var(--midnight);
  color: var(--ink);
}

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

html { min-width: 20rem; scroll-behavior: smooth; }

body {
  margin: 0;
  overflow-x: clip;
  background:
    linear-gradient(rgba(112, 225, 255, 0.045) 1px, transparent 1px) 0 0 / 4rem 4rem,
    linear-gradient(90deg, rgba(112, 225, 255, 0.045) 1px, transparent 1px) 0 0 / 4rem 4rem,
    var(--midnight);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 1rem;
  line-height: 1.45;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; }

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

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

.skip-link {
  position: fixed;
  z-index: 20;
  top: 0.75rem;
  left: 0.75rem;
  padding: 0.75rem 1rem;
  background: var(--signal);
  color: var(--midnight);
  font-family: var(--mono);
  font-size: 0.75rem;
  font-weight: 800;
  transform: translateY(-160%);
}

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

.site-header,
footer {
  display: grid;
  width: min(100%, 112rem);
  min-height: 5.5rem;
  margin-inline: auto;
  padding-inline: var(--gutter);
  border-bottom: 1px solid var(--rule);
  grid-template-columns: 1fr auto 1fr;
  gap: 2rem;
  align-items: center;
  font-family: var(--mono);
  font-size: 0.69rem;
  font-weight: 700;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.site-header p { margin: 0; color: var(--quiet); }
.site-header a, footer a { min-height: 44px; display: inline-flex; align-items: center; text-decoration: none; }
.site-home { justify-self: start; }
.console-link { justify-self: end; gap: 0.6rem; }
.site-header a:hover, footer a:hover { color: var(--signal); }

main { width: min(100%, 112rem); margin-inline: auto; }

.hero {
  display: grid;
  min-height: calc(100svh - 5.5rem);
  padding: clamp(4rem, 9vh, 8rem) var(--gutter);
  border-bottom: 1px solid var(--rule);
  grid-template-columns: minmax(0, 1.05fr) minmax(30rem, 0.95fr);
  gap: clamp(3rem, 7vw, 8rem);
  align-items: center;
}

.hero > * { min-width: 0; }

.eyebrow,
.section-label {
  margin: 0;
  color: var(--cyan);
  font-family: var(--mono);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.hero h1 {
  max-width: 10ch;
  margin: 2rem 0;
  font-size: clamp(4.5rem, 8.5vw, 9.75rem);
  font-weight: 760;
  letter-spacing: -0.078em;
  line-height: 0.84;
}

.hero h1 span {
  color: var(--cyan);
  -webkit-text-fill-color: transparent;
  -webkit-text-stroke: 1px var(--cyan);
}

.hero-intro {
  max-width: 41rem;
  margin: 0;
  color: var(--quiet);
  font-size: clamp(1.15rem, 1.8vw, 1.55rem);
  line-height: 1.5;
}

.hero-actions {
  display: flex;
  margin-top: 2.5rem;
  gap: 1rem;
  flex-wrap: wrap;
}

.hero-actions a,
.future a {
  display: inline-flex;
  min-height: 48px;
  padding: 0 1rem;
  border: 1px solid var(--rule);
  align-items: center;
  gap: 0.6rem;
  font-family: var(--mono);
  font-size: 0.7rem;
  font-weight: 750;
  letter-spacing: 0.06em;
  text-decoration: none;
  text-transform: uppercase;
}

.hero-actions .primary-action { border-color: var(--signal); background: var(--signal); color: var(--midnight); }
.hero-actions a:hover, .future a:hover { border-color: var(--cyan); color: var(--cyan); }
.hero-actions .primary-action:hover { border-color: var(--cyan); background: var(--cyan); color: var(--midnight); }

.signal {
  position: relative;
  min-height: 42rem;
  padding: 1px;
  border: 1px solid rgba(112, 225, 255, 0.5);
  background: rgba(16, 47, 186, 0.14);
  box-shadow: 1.5rem 1.5rem 0 rgba(36, 91, 255, 0.23);
  overflow: hidden;
}

.signal-grid {
  position: absolute;
  inset: 0;
  opacity: 0.65;
  background:
    linear-gradient(30deg, transparent 49.5%, rgba(112, 225, 255, 0.18) 50%, transparent 50.5%) 0 0 / 5rem 8.66rem,
    linear-gradient(150deg, transparent 49.5%, rgba(112, 225, 255, 0.18) 50%, transparent 50.5%) 0 0 / 5rem 8.66rem,
    linear-gradient(30deg, rgba(36, 91, 255, 0.19) 25%, transparent 25%) 0 0 / 10rem 8.66rem;
  pointer-events: none;
}

.signal-message,
.signal-result {
  position: relative;
  z-index: 1;
  margin: 2rem;
  padding: 1.25rem;
  border: 1px solid var(--rule);
  background: rgba(6, 11, 26, 0.9);
}

.signal-message span,
.signal-result span {
  color: var(--cyan);
  font-family: var(--mono);
  font-size: 0.64rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.signal-message p,
.signal-result p { margin: 0.8rem 0 0; font-size: 1.08rem; }

.signal-route {
  position: relative;
  z-index: 1;
  display: grid;
  margin: 4rem 2rem;
  padding: 0;
  grid-template-columns: repeat(4, 1fr);
  list-style: none;
}

.signal-route::before {
  position: absolute;
  top: 1.1rem;
  right: 0;
  left: 0;
  height: 1px;
  background: var(--rule);
  content: "";
}

.signal-route li { position: relative; display: grid; padding-top: 3rem; gap: 0.25rem; }

.signal-route li::before {
  position: absolute;
  top: 0.7rem;
  left: 0;
  width: 0.8rem;
  height: 0.8rem;
  border: 1px solid var(--cyan);
  background: var(--midnight);
  content: "";
  transform: rotate(45deg);
  transition: background 240ms var(--ease), box-shadow 240ms var(--ease);
}

.signal[data-running="true"] .signal-route li::before,
.signal-route li.active::before { background: var(--signal); box-shadow: 0 0 0 0.4rem rgba(200, 255, 57, 0.12); }

.signal-route span,
.signal-route small {
  color: var(--quiet);
  font-family: var(--mono);
  font-size: 0.62rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.signal-route strong { font-size: 0.92rem; }
.signal-result { border-color: var(--signal); }

.signal-examples {
  position: absolute;
  z-index: 2;
  right: 2rem;
  bottom: 2rem;
  left: 2rem;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
}

.signal-examples button {
  min-height: 48px;
  padding: 0.5rem;
  border: 1px solid var(--rule);
  border-right: 0;
  background: var(--panel);
  color: var(--quiet);
  font-family: var(--mono);
  font-size: 0.66rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  cursor: pointer;
}

.signal-examples button:last-child { border-right: 1px solid var(--rule); }
.signal-examples button[aria-pressed="true"] { background: var(--ink); color: var(--midnight); }

.statement,
.future {
  padding: clamp(6rem, 13vw, 13rem) var(--gutter);
  border-bottom: 1px solid var(--rule);
}

.statement h2,
.future h2 {
  max-width: 12ch;
  margin: 1.25rem 0 2rem;
  font-size: clamp(4rem, 9vw, 9rem);
  font-weight: 720;
  letter-spacing: -0.075em;
  line-height: 0.88;
}

.statement > p:last-child,
.future > p {
  max-width: 48rem;
  margin: 0 0 0 auto;
  color: var(--quiet);
  font-size: clamp(1.25rem, 2.2vw, 1.9rem);
  line-height: 1.5;
}

.capabilities,
.system,
.boundary {
  padding: clamp(5rem, 10vw, 9rem) var(--gutter);
  border-bottom: 1px solid var(--rule);
}

.section-heading {
  display: grid;
  margin-bottom: 4rem;
  grid-template-columns: 0.7fr 1.3fr;
  gap: 3rem;
}

.section-heading h2,
.boundary h2 {
  max-width: 13ch;
  margin: 0;
  font-size: clamp(3rem, 5.8vw, 6rem);
  font-weight: 720;
  letter-spacing: -0.065em;
  line-height: 0.92;
}

.capability-ledger { border-top: 1px solid var(--rule); }

.capability-ledger article {
  display: grid;
  min-height: 12rem;
  padding: 2rem 0;
  border-bottom: 1px solid var(--rule);
  grid-template-columns: 0.55fr 1fr 1.1fr;
  gap: 2.5rem;
  align-items: start;
}

.capability-ledger p {
  margin: 0;
  color: var(--cyan);
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.capability-ledger h3 { margin: 0; font-size: clamp(1.6rem, 2.8vw, 2.75rem); letter-spacing: -0.045em; line-height: 1; }
.capability-ledger span { color: var(--quiet); font-size: 1.05rem; line-height: 1.6; }

.system { background: var(--cobalt); }
.system .section-label { color: var(--signal); }
.system-heading > p:last-child { max-width: 35rem; margin: 0; color: rgba(244, 247, 255, 0.76); font-size: 1.1rem; }

.system-map {
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr auto 1fr;
  align-items: stretch;
}

.system-node { min-height: 16rem; padding: 1.5rem; border: 1px solid rgba(244, 247, 255, 0.46); background: rgba(6, 11, 26, 0.13); }
.system-node span { font: 0.65rem var(--mono); letter-spacing: 0.07em; text-transform: uppercase; }
.system-node strong { display: block; margin-top: 3rem; font-size: clamp(1.7rem, 2.7vw, 2.7rem); letter-spacing: -0.05em; }
.system-node p { color: rgba(244, 247, 255, 0.76); }
.system-arrow { display: grid; width: 3rem; place-items: center; font: 1.4rem var(--mono); }

.boundary { display: grid; grid-template-columns: 0.8fr 1.2fr; gap: clamp(3rem, 8vw, 9rem); }
.boundary h2 { margin-top: 1.25rem; }
.boundary-rules { border-top: 1px solid var(--rule); }
.boundary-rules p { display: grid; margin: 0; padding: 1.6rem 0; border-bottom: 1px solid var(--rule); grid-template-columns: 0.9fr 1.1fr; gap: 2rem; }
.boundary-rules strong { font-size: 1.15rem; }
.boundary-rules span { color: var(--quiet); }

.future { background: var(--ink); color: var(--midnight); }
.future .section-label { color: var(--cobalt); }
.future h2 { max-width: 13ch; }
.future > p { color: #53617f; }
.future a { margin-top: 3rem; border-color: var(--midnight); }

footer { border-bottom: 0; border-top: 1px solid var(--rule); }
footer span { color: var(--quiet); text-align: center; }
footer a:last-child { justify-self: end; }

@media (max-width: 980px) {
  .hero { grid-template-columns: 1fr; }
  .hero h1 { max-width: 9ch; }
  .signal { min-height: 38rem; }
  .system-map { grid-template-columns: 1fr; }
  .system-arrow { width: 100%; height: 3rem; transform: rotate(90deg); }
  .system-node { min-height: 12rem; }
}

@media (max-width: 720px) {
  .site-header { min-height: 4.5rem; grid-template-columns: 1fr auto; gap: 1rem; }
  .site-header p { display: none; }
  .console-link { font-size: 0; }
  .console-link::before { content: "Console"; font-size: 0.68rem; }
  .hero { min-height: auto; padding-top: 5rem; }
  .hero h1 { margin-block: 1.5rem; font-size: clamp(3.2rem, 13.2vw, 4.4rem); }
  .hero-intro { font-size: 1.08rem; }
  .hero-actions { display: grid; grid-template-columns: 1fr; }
  .hero-actions a { justify-content: center; }
  .signal { min-height: 45rem; box-shadow: 0.75rem 0.75rem 0 rgba(36, 91, 255, 0.23); }
  .signal-message, .signal-result { margin: 1rem; }
  .signal-route { margin: 3rem 1rem; grid-template-columns: 1fr; gap: 1rem; }
  .signal-route::before { top: 0; right: auto; bottom: 0; left: 0.4rem; width: 1px; height: auto; }
  .signal-route li { min-height: 3rem; padding: 0 0 0 2rem; }
  .signal-route li::before { top: 0.1rem; }
  .signal-examples { right: 1rem; bottom: 1rem; left: 1rem; }
  .signal-examples button { font-size: 0.58rem; }
  .statement, .future, .capabilities, .system, .boundary { padding-block: 5rem; }
  .statement h2, .future h2 { font-size: clamp(3.7rem, 17vw, 6rem); }
  .statement > p:last-child, .future > p { margin-left: 0; font-size: 1.15rem; }
  .section-heading, .boundary { grid-template-columns: 1fr; gap: 1.5rem; }
  .section-heading { margin-bottom: 3rem; }
  .capability-ledger article { min-height: auto; grid-template-columns: 1fr; gap: 1rem; }
  .capability-ledger h3 { font-size: 2rem; }
  .boundary-rules p { grid-template-columns: 1fr; gap: 0.65rem; }
  footer { min-height: 8rem; padding-block: 1.5rem; grid-template-columns: 1fr auto; }
  footer span { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { scroll-behavior: auto !important; transition-duration: 0.001ms !important; animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; }
}