:root {
  color-scheme: dark;
  --obs-night: #06100e;
  --obs-night-deep: #020705;
  --obs-panel: rgba(8, 22, 18, 0.88);
  --obs-panel-solid: #091713;
  --obs-paper: #f1edde;
  --obs-paper-soft: #d8d7c8;
  --obs-muted: rgba(241, 237, 222, 0.74);
  --obs-faint: rgba(241, 237, 222, 0.55);
  --obs-signal: #82e4bb;
  --obs-signal-rgb: 130, 228, 187;
  --obs-sky: #84c9d5;
  --obs-amber: #eab86c;
  --obs-coral: #e47c70;
  --obs-line: rgba(130, 228, 187, 0.16);
  --obs-line-strong: rgba(130, 228, 187, 0.34);
  --obs-display: "Iowan Old Style", "Palatino Linotype", "Book Antiqua", Georgia, serif;
  --obs-sans: "Avenir Next", "Gill Sans", "Trebuchet MS", sans-serif;
  --obs-mono: "IBM Plex Mono", "Cascadia Code", "Liberation Mono", monospace;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 18rem;
  min-height: 100vh;
  color: var(--obs-paper);
  font-family: var(--obs-sans);
  background:
    radial-gradient(circle at 87% 5%, rgba(132, 201, 213, 0.11), transparent 29rem),
    radial-gradient(circle at 8% 34%, rgba(var(--obs-signal-rgb), 0.08), transparent 32rem),
    linear-gradient(145deg, #091815 0%, var(--obs-night) 42%, var(--obs-night-deep) 100%);
}

body::before,
body::after {
  content: "";
  position: fixed;
  z-index: -2;
  inset: 0;
  pointer-events: none;
}

body::before {
  background:
    linear-gradient(rgba(var(--obs-signal-rgb), 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(var(--obs-signal-rgb), 0.035) 1px, transparent 1px);
  background-size: 5rem 5rem;
  mask-image: linear-gradient(to bottom, black, transparent 88%);
}

body::after {
  z-index: -1;
  background-image:
    radial-gradient(circle, rgba(241, 237, 222, 0.48) 0 1px, transparent 1.2px),
    radial-gradient(circle, rgba(132, 201, 213, 0.42) 0 1px, transparent 1.2px);
  background-position: 1rem 2rem, 4rem 1rem;
  background-size: 7rem 7rem, 11rem 11rem;
  opacity: 0.14;
}

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

a {
  color: inherit;
}

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

:focus-visible {
  outline: 2px solid var(--obs-amber);
  outline-offset: 4px;
}

.skip-link {
  position: fixed;
  z-index: 50;
  top: 0.75rem;
  left: 0.75rem;
  padding: 0.72rem 0.9rem;
  border: 1px solid var(--obs-signal);
  color: var(--obs-paper);
  background: var(--obs-night-deep);
  font-family: var(--obs-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-decoration: none;
  text-transform: uppercase;
  transform: translateY(-180%);
  transition: transform 150ms ease;
}

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

.observatory-shell {
  width: min(1380px, calc(100% - 2rem));
  margin: 0 auto;
}

.obs-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 2rem;
  min-height: 5.5rem;
  border-bottom: 1px solid var(--obs-line);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.9rem;
  min-width: max-content;
  text-decoration: none;
}

.brand__seal {
  display: grid;
  place-items: center;
  width: 3.2rem;
  height: 3.2rem;
  border: 1px solid var(--obs-line-strong);
  border-radius: 50%;
  color: var(--obs-signal);
  background:
    radial-gradient(circle, rgba(var(--obs-signal-rgb), 0.16), transparent 58%),
    var(--obs-night);
  box-shadow:
    0 0 0 0.35rem rgba(var(--obs-signal-rgb), 0.035),
    0 0 1.8rem rgba(var(--obs-signal-rgb), 0.08);
  font-family: var(--obs-mono);
  font-size: 0.68rem;
  letter-spacing: 0.2em;
  text-indent: 0.2em;
}

.brand__copy {
  display: grid;
  gap: 0.18rem;
}

.brand__copy strong {
  font-family: var(--obs-mono);
  font-size: 0.79rem;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.brand__copy span {
  color: var(--obs-faint);
  font-family: var(--obs-mono);
  font-size: 0.68rem;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

.obs-nav {
  display: flex;
  justify-content: flex-end;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.25rem;
}

.obs-nav a {
  padding: 0.7rem 0.72rem;
  color: var(--obs-muted);
  font-family: var(--obs-mono);
  font-size: 0.67rem;
  letter-spacing: 0.1em;
  text-decoration: none;
  text-transform: uppercase;
  transition:
    color 150ms ease,
    background-color 150ms ease;
}

.obs-nav a::before {
  content: "/ ";
  color: var(--obs-signal);
}

.obs-nav a:hover {
  color: var(--obs-paper);
  background: rgba(var(--obs-signal-rgb), 0.055);
}

main {
  display: block;
}

.obs-hero {
  display: grid;
  grid-template-columns: minmax(0, 0.98fr) minmax(32rem, 1.02fr);
  min-height: 46rem;
  border-bottom: 1px solid var(--obs-line);
}

.obs-hero__copy {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: clamp(4rem, 7vw, 7rem) clamp(1rem, 5vw, 5rem) clamp(4rem, 7vw, 7rem) 0;
}

.eyebrow {
  margin: 0;
  color: var(--obs-signal);
  font-family: var(--obs-mono);
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  line-height: 1.5;
  text-transform: uppercase;
}

.obs-hero h1 {
  width: min(100%, 43rem);
  margin: 1.2rem 0 1.6rem;
  font-family: var(--obs-display);
  font-size: clamp(4.05rem, 6.2vw, 6.35rem);
  font-weight: 400;
  line-height: 0.91;
  letter-spacing: -0.058em;
}

.obs-hero h1 span,
.obs-hero h1 em {
  display: block;
}

.obs-hero h1 em {
  margin: 0.08em 0 0.11em;
  padding-left: 0.38em;
  color: var(--obs-signal);
  font-weight: 400;
  line-height: 0.88;
}

.hero-title__public {
  max-width: 8.5ch;
}

@media (min-width: 1121px) {
  .hero-title__systems,
  .hero-title__experiments {
    white-space: nowrap;
  }
}

.obs-hero__lead {
  max-width: 42rem;
  margin: 0;
  color: var(--obs-paper-soft);
  font-family: var(--obs-display);
  font-size: clamp(1.15rem, 1.8vw, 1.48rem);
  line-height: 1.58;
}

.obs-hero__posture {
  max-width: 39rem;
  margin: 1.5rem 0 0;
  padding-left: 1rem;
  border-left: 1px solid var(--obs-amber);
  color: var(--obs-muted);
  font-family: var(--obs-mono);
  font-size: 0.73rem;
  letter-spacing: 0.045em;
  line-height: 1.65;
}

.obs-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin-top: 2.3rem;
}

.obs-button {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  min-height: 3rem;
  padding: 0.75rem 1.15rem;
  border: 1px solid var(--obs-line-strong);
  color: var(--obs-paper);
  background: rgba(8, 22, 18, 0.42);
  font-family: var(--obs-mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-decoration: none;
  text-transform: uppercase;
  transition:
    color 150ms ease,
    border-color 150ms ease,
    background-color 150ms ease,
    transform 150ms ease;
}

.obs-button::after {
  content: "↗";
  margin-left: 0.8rem;
  color: var(--obs-signal);
}

.obs-button--primary {
  border-color: var(--obs-signal);
  color: var(--obs-night-deep);
  background: var(--obs-signal);
}

.obs-button--primary::after {
  color: var(--obs-night-deep);
}

.obs-button:hover {
  border-color: var(--obs-paper);
  background: rgba(241, 237, 222, 0.08);
  transform: translateY(-2px);
}

.obs-button--primary:hover {
  color: var(--obs-night-deep);
  background: var(--obs-paper);
}

.obs-hero__facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0;
  max-width: 44rem;
  margin: 2.8rem 0 0;
  border-top: 1px solid var(--obs-line);
  border-bottom: 1px solid var(--obs-line);
}

.obs-hero__facts div {
  min-width: 0;
  padding: 0.9rem 1rem 0.9rem 0;
}

.obs-hero__facts div + div {
  padding-left: 1rem;
  border-left: 1px solid var(--obs-line);
}

.obs-hero__facts dt,
.coordinate__meta dt {
  color: var(--obs-faint);
  font-family: var(--obs-mono);
  font-size: 0.59rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.obs-hero__facts dd,
.coordinate__meta dd {
  margin: 0.34rem 0 0;
  font-family: var(--obs-mono);
  font-size: 0.72rem;
  line-height: 1.4;
}

.scope {
  position: relative;
  min-width: 0;
  min-height: 46rem;
  margin: 0;
  overflow: hidden;
  border-left: 1px solid var(--obs-line);
  background:
    linear-gradient(rgba(var(--obs-signal-rgb), 0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(var(--obs-signal-rgb), 0.025) 1px, transparent 1px),
    radial-gradient(circle at 50% 50%, rgba(var(--obs-signal-rgb), 0.07), transparent 50%),
    rgba(3, 10, 8, 0.32);
  background-size: 2rem 2rem, 2rem 2rem, auto, auto;
}

.scope::after {
  content: "";
  position: absolute;
  inset: 1.25rem;
  border: 1px solid rgba(var(--obs-signal-rgb), 0.08);
  pointer-events: none;
}

.scope__heading {
  position: absolute;
  z-index: 4;
  top: 2.25rem;
  right: 2.25rem;
  left: 2.25rem;
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding-bottom: 0.85rem;
  border-bottom: 1px solid var(--obs-line);
  font-family: var(--obs-mono);
  font-size: 0.62rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

.scope__heading span {
  color: var(--obs-signal);
}

.scope__heading strong {
  color: var(--obs-faint);
  font-weight: 400;
}

.scope__chart {
  position: absolute;
  top: 50%;
  left: 50%;
  width: min(94%, 42rem);
  height: auto;
  transform: translate(-50%, -50%);
}

.scope__ring,
.scope__axis,
.scope__spiral,
.scope__sweep,
.scope__core-halo,
.scope__node-halo {
  fill: none;
}

.scope__ring {
  stroke: rgba(var(--obs-signal-rgb), 0.17);
  stroke-width: 1;
}

.scope__ring--outer {
  stroke: rgba(var(--obs-signal-rgb), 0.3);
  stroke-width: 1.25;
}

.scope__ring--dash {
  stroke-dasharray: 4 9;
}

.scope__axis {
  stroke: rgba(var(--obs-signal-rgb), 0.09);
  stroke-width: 1;
}

.scope__spiral {
  stroke: var(--obs-signal);
  stroke-width: 2.25;
  stroke-linecap: round;
  filter: drop-shadow(0 0 0.75rem rgba(var(--obs-signal-rgb), 0.32));
}

.scope__sweep {
  stroke: rgba(132, 201, 213, 0.52);
  stroke-width: 1;
  transform-origin: 320px 320px;
  animation: scope-sweep 18s linear infinite;
}

.scope__node {
  color: var(--obs-signal);
}

.scope__node--play {
  color: var(--obs-amber);
}

.scope__node--systems {
  color: var(--obs-sky);
}

.scope__node line {
  stroke: currentColor;
  stroke-width: 1;
  stroke-opacity: 0.44;
}

.scope__node-halo {
  stroke: currentColor;
  stroke-width: 1;
  stroke-opacity: 0.58;
  transform-box: fill-box;
  transform-origin: center;
  animation: node-breathe 3.6s ease-in-out infinite;
}

.scope__node-dot {
  fill: currentColor;
  filter: drop-shadow(0 0 0.5rem currentColor);
}

.scope__node--systems .scope__node-halo {
  animation-delay: -1.2s;
}

.scope__core-halo {
  stroke: rgba(var(--obs-signal-rgb), 0.24);
  stroke-width: 1;
}

.scope__core {
  fill: var(--obs-paper);
  filter: drop-shadow(0 0 0.8rem var(--obs-signal));
}

.scope-point {
  position: absolute;
  z-index: 5;
  display: grid;
  gap: 0.2rem;
  min-width: 10.5rem;
  padding: 0.66rem 0.75rem 0.62rem 1.6rem;
  border: 1px solid var(--obs-line);
  color: var(--obs-paper);
  background: rgba(3, 10, 8, 0.88);
  box-shadow: 0 0.8rem 2.2rem rgba(0, 0, 0, 0.22);
  text-decoration: none;
  transition:
    border-color 150ms ease,
    background-color 150ms ease,
    transform 150ms ease;
}

.scope-point::before {
  content: "";
  position: absolute;
  top: 50%;
  left: 0.65rem;
  width: 0.42rem;
  height: 0.42rem;
  border-radius: 50%;
  background: var(--point-color, var(--obs-signal));
  box-shadow: 0 0 0.7rem var(--point-color, var(--obs-signal));
  transform: translateY(-50%);
}

.scope-point::after {
  content: "";
  position: absolute;
  top: 50%;
  right: 100%;
  width: 2.25rem;
  border-top: 1px solid var(--point-color, var(--obs-signal));
  opacity: 0.44;
}

.scope-point span {
  color: var(--obs-faint);
  font-family: var(--obs-mono);
  font-size: 0.56rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.scope-point strong {
  font-family: var(--obs-display);
  font-size: 1rem;
  font-weight: 400;
}

.scope-point:hover {
  border-color: var(--point-color, var(--obs-signal));
  background: rgba(9, 23, 19, 0.96);
  transform: translateY(-2px);
}

.scope-point--play {
  --point-color: var(--obs-amber);
  top: 24%;
  right: 4%;
}

.scope-point--systems {
  --point-color: var(--obs-sky);
  right: 6%;
  bottom: 24%;
}

.scope figcaption {
  position: absolute;
  z-index: 4;
  right: 2.25rem;
  bottom: 2.25rem;
  left: 2.25rem;
  padding-top: 0.85rem;
  border-top: 1px solid var(--obs-line);
  color: var(--obs-faint);
  font-family: var(--obs-mono);
  font-size: 0.6rem;
  letter-spacing: 0.08em;
  line-height: 1.5;
  text-transform: uppercase;
}

.signal-strip {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  border-bottom: 1px solid var(--obs-line);
}

.signal-strip p {
  display: grid;
  gap: 0.2rem;
  margin: 0;
  padding: 1.15rem 1.25rem;
}

.signal-strip p + p {
  border-left: 1px solid var(--obs-line);
}

.signal-strip strong {
  color: var(--obs-signal);
  font-family: var(--obs-display);
  font-size: 1.35rem;
  font-weight: 400;
}

.signal-strip span {
  color: var(--obs-faint);
  font-family: var(--obs-mono);
  font-size: 0.57rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.constellation,
.ledger,
.charter,
.field-notes {
  padding: clamp(4.5rem, 8vw, 8rem) clamp(0rem, 3vw, 2.5rem);
  border-bottom: 1px solid var(--obs-line);
}

.section-head {
  max-width: 51rem;
  margin-bottom: clamp(2.5rem, 5vw, 4.5rem);
}

.section-head h2 {
  max-width: 12ch;
  margin: 0.75rem 0 1rem;
  font-family: var(--obs-display);
  font-size: clamp(2.8rem, 5.3vw, 5.2rem);
  font-weight: 400;
  line-height: 0.94;
  letter-spacing: -0.045em;
}

.section-head > p:last-child,
.section-head--split > p {
  max-width: 42rem;
  margin: 0;
  color: var(--obs-muted);
  font-family: var(--obs-display);
  font-size: clamp(1rem, 1.5vw, 1.2rem);
  line-height: 1.55;
}

.section-head--split {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(18rem, 0.72fr);
  align-items: end;
  gap: 3rem;
  max-width: none;
}

.section-head--split h2 {
  margin-bottom: 0;
}

.coordinate-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  align-items: stretch;
  border-top: 1px solid var(--obs-line);
  border-bottom: 1px solid var(--obs-line);
}

.coordinate {
  --coordinate-color: var(--obs-signal);
  display: flex;
  flex-direction: column;
  min-width: 0;
  padding: clamp(1.3rem, 2.4vw, 2.25rem);
  background:
    linear-gradient(90deg, var(--coordinate-color), transparent 34%) top / 100% 1px no-repeat,
    linear-gradient(180deg, rgba(var(--obs-signal-rgb), 0.025), transparent 60%);
}

.coordinate--play {
  --coordinate-color: var(--obs-amber);
}

.coordinate--systems {
  --coordinate-color: var(--obs-sky);
}

.coordinate + .coordinate {
  border-left: 1px solid var(--obs-line);
}

.coordinate__topline {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  font-family: var(--obs-mono);
  font-size: 0.56rem;
  letter-spacing: 0.12em;
  line-height: 1.45;
  text-transform: uppercase;
}

.coordinate__topline span {
  color: var(--obs-faint);
}

.coordinate__topline strong {
  color: var(--coordinate-color);
  font-weight: 400;
  text-align: right;
}

.coordinate__visual {
  position: relative;
  display: grid;
  place-items: center;
  height: clamp(10rem, 18vw, 15rem);
  margin: 1.5rem 0 1.7rem;
  overflow: hidden;
  border-top: 1px solid var(--obs-line);
  border-bottom: 1px solid var(--obs-line);
  background:
    linear-gradient(rgba(var(--obs-signal-rgb), 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(var(--obs-signal-rgb), 0.035) 1px, transparent 1px);
  background-size: 1.5rem 1.5rem;
}

.coordinate__visual--play span {
  position: absolute;
  border: 1px solid rgba(234, 184, 108, 0.34);
  border-radius: 50%;
}

.coordinate__visual--play span:nth-child(1) {
  width: 10rem;
  height: 10rem;
}

.coordinate__visual--play span:nth-child(2) {
  width: 6.5rem;
  height: 6.5rem;
  border-style: dashed;
}

.coordinate__visual--play span:nth-child(3) {
  width: 2.1rem;
  height: 2.1rem;
  border-color: var(--obs-amber);
  box-shadow: 0 0 2rem rgba(234, 184, 108, 0.18);
}

.coordinate__visual--play b {
  z-index: 1;
  color: var(--obs-paper);
  font-family: var(--obs-display);
  font-size: 2.8rem;
  font-weight: 400;
}

.coordinate__visual--systems {
  background:
    conic-gradient(
      from 210deg at 50% 50%,
      rgba(132, 201, 213, 0.5),
      transparent 17%,
      rgba(var(--obs-signal-rgb), 0.45) 32%,
      transparent 45%,
      rgba(132, 201, 213, 0.32) 62%,
      transparent 78%
    ),
    radial-gradient(circle, rgba(var(--obs-signal-rgb), 0.32), transparent 38%),
    var(--obs-night-deep);
}

.coordinate__visual--systems span {
  position: absolute;
  width: 52%;
  aspect-ratio: 1;
  border: 1px solid rgba(132, 201, 213, 0.3);
  border-radius: 50%;
}

.coordinate__visual--systems span:nth-child(2) {
  width: 32%;
}

.coordinate__visual--systems span:nth-child(3) {
  width: 13%;
  background: rgba(3, 10, 8, 0.68);
}

.coordinate__visual--systems b {
  z-index: 1;
  color: var(--obs-paper);
  font-family: var(--obs-display);
  font-size: 2.4rem;
  font-weight: 400;
}

.coordinate__class {
  margin: 0 0 0.65rem;
  color: var(--coordinate-color);
  font-family: var(--obs-mono);
  font-size: 0.58rem;
  letter-spacing: 0.13em;
  line-height: 1.45;
  text-transform: uppercase;
}

.coordinate h3 {
  margin: 0;
  font-family: var(--obs-display);
  font-size: clamp(2rem, 3.5vw, 3.4rem);
  font-weight: 400;
  line-height: 1;
  letter-spacing: -0.035em;
}

.coordinate > p:not(.coordinate__class) {
  flex: 1;
  margin: 1rem 0 1.5rem;
  color: var(--obs-muted);
  font-size: 0.94rem;
  line-height: 1.68;
}

.coordinate__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  margin: 0 0 1.6rem;
  border-top: 1px solid var(--obs-line);
  border-bottom: 1px solid var(--obs-line);
}

.coordinate__meta div {
  flex: 1;
  min-width: 5.5rem;
  padding: 0.75rem 0;
}

.coordinate__meta div + div {
  padding-left: 0.8rem;
  border-left: 1px solid var(--obs-line);
}

.coordinate__link {
  align-self: flex-start;
  color: var(--obs-paper);
  font-family: var(--obs-mono);
  font-size: 0.65rem;
  letter-spacing: 0.1em;
  text-decoration-color: var(--coordinate-color);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.4rem;
  text-transform: uppercase;
}

.coordinate__link::after {
  content: "  ↗";
  color: var(--coordinate-color);
}

.coordinate__link:hover {
  color: var(--coordinate-color);
}

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

.ledger-list li {
  display: grid;
  grid-template-columns: 6rem minmax(11rem, 0.9fr) minmax(11rem, 0.7fr) 6rem minmax(16rem, 1.35fr);
  align-items: center;
  gap: 1.2rem;
  min-height: 5.1rem;
  padding: 0.95rem 0;
  border-bottom: 1px solid var(--obs-line);
}

.ledger-list__id,
.ledger-list__scope,
.ledger-list__status {
  font-family: var(--obs-mono);
  font-size: 0.59rem;
  letter-spacing: 0.11em;
  text-transform: uppercase;
}

.ledger-list__id {
  color: var(--obs-signal);
}

.ledger-list li > strong {
  font-family: var(--obs-display);
  font-size: 1.18rem;
  font-weight: 400;
}

.ledger-list__scope {
  color: var(--obs-faint);
}

.ledger-list__status {
  position: relative;
  padding-left: 0.9rem;
}

.ledger-list__status::before {
  content: "";
  position: absolute;
  top: 50%;
  left: 0;
  width: 0.38rem;
  height: 0.38rem;
  border-radius: 50%;
  background: currentColor;
  box-shadow: 0 0 0.65rem currentColor;
  transform: translateY(-50%);
}

.ledger-list__status--live {
  color: var(--obs-signal);
}

.ledger-list__status--careful {
  color: var(--obs-amber);
}

.ledger-list__status--hold {
  color: var(--obs-coral);
}

.ledger-list li > p {
  margin: 0;
  color: var(--obs-muted);
  font-size: 0.85rem;
  line-height: 1.55;
}

.charter {
  position: relative;
  color: var(--obs-paper);
  background:
    radial-gradient(circle at 88% 12%, rgba(234, 184, 108, 0.09), transparent 26rem),
    radial-gradient(circle at 8% 90%, rgba(var(--obs-signal-rgb), 0.07), transparent 25rem),
    linear-gradient(rgba(var(--obs-signal-rgb), 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(var(--obs-signal-rgb), 0.035) 1px, transparent 1px),
    linear-gradient(145deg, rgba(10, 28, 23, 0.96), rgba(3, 10, 8, 0.98));
  background-size: auto, auto, 4rem 4rem, 4rem 4rem, auto;
  box-shadow:
    inset 0 1px 0 rgba(var(--obs-signal-rgb), 0.14),
    inset 0 -1px 0 rgba(var(--obs-signal-rgb), 0.14);
}

.charter::before {
  content: "PUBLIC OPERATING CHARTER";
  position: absolute;
  top: 2rem;
  right: 2.5rem;
  color: var(--obs-faint);
  font-family: var(--obs-mono);
  font-size: 0.58rem;
  letter-spacing: 0.18em;
  writing-mode: vertical-rl;
}

.charter .eyebrow {
  color: var(--obs-signal);
}

.charter .section-head > p:last-child {
  color: var(--obs-muted);
}

.charter-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  border-top: 1px solid var(--obs-line-strong);
  border-bottom: 1px solid var(--obs-line-strong);
}

.charter-grid article {
  --charter-accent: var(--obs-signal);
  position: relative;
  min-height: 18rem;
  padding: clamp(1.5rem, 3vw, 2.6rem);
  background: linear-gradient(180deg, rgba(var(--obs-signal-rgb), 0.035), transparent 68%);
}

.charter-grid article:nth-child(2) {
  --charter-accent: var(--obs-sky);
}

.charter-grid article:nth-child(3) {
  --charter-accent: var(--obs-amber);
}

.charter-grid article::before {
  content: "";
  position: absolute;
  top: -1px;
  right: 0;
  left: 0;
  height: 1px;
  background: linear-gradient(90deg, var(--charter-accent), transparent 74%);
}

.charter-grid article + article {
  border-left: 1px solid var(--obs-line);
}

.charter-grid span {
  color: var(--charter-accent);
  font-family: var(--obs-mono);
  font-size: 0.61rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

.charter-grid h3 {
  max-width: 9ch;
  margin: 3rem 0 1rem;
  font-family: var(--obs-display);
  font-size: clamp(2rem, 3.5vw, 3.35rem);
  font-weight: 400;
  line-height: 0.96;
  letter-spacing: -0.04em;
}

.charter-grid p {
  max-width: 25rem;
  margin: 0;
  color: var(--obs-muted);
  font-size: 0.92rem;
  line-height: 1.65;
}

.privacy-plate {
  display: grid;
  grid-template-columns: minmax(12rem, 0.7fr) minmax(18rem, 1.2fr) auto;
  align-items: center;
  gap: 2rem;
  margin-top: 2.5rem;
  padding: 1.5rem;
  border: 1px solid var(--obs-line-strong);
  border-left: 3px solid var(--obs-signal);
  color: var(--obs-paper);
  background:
    linear-gradient(90deg, rgba(var(--obs-signal-rgb), 0.065), transparent 34%),
    rgba(2, 7, 5, 0.8);
  box-shadow: 0 1.2rem 3.5rem rgba(0, 0, 0, 0.2);
}

.privacy-plate p {
  margin: 0;
}

.privacy-plate__label {
  color: var(--obs-signal);
  font-family: var(--obs-mono);
  font-size: 0.65rem;
  letter-spacing: 0.1em;
  line-height: 1.55;
  text-transform: uppercase;
}

.privacy-plate p:not(.privacy-plate__label) {
  color: var(--obs-muted);
  font-family: var(--obs-display);
  font-size: 1rem;
  line-height: 1.5;
}

.privacy-plate a {
  min-width: max-content;
  color: var(--obs-paper);
  font-family: var(--obs-mono);
  font-size: 0.63rem;
  letter-spacing: 0.09em;
  text-decoration-color: var(--obs-signal);
  text-underline-offset: 0.35rem;
  text-transform: uppercase;
}

.notes-list {
  border-top: 1px solid var(--obs-line);
}

.notes-list article {
  display: grid;
  grid-template-columns: 7rem minmax(0, 1fr) auto;
  align-items: start;
  gap: 2rem;
  padding: 1.65rem 0;
  border-bottom: 1px solid var(--obs-line);
}

.notes-list time {
  color: var(--obs-signal);
  font-family: var(--obs-mono);
  font-size: 0.67rem;
  letter-spacing: 0.12em;
}

.notes-list h3 {
  margin: 0;
  font-family: var(--obs-display);
  font-size: clamp(1.45rem, 2.6vw, 2.25rem);
  font-weight: 400;
  line-height: 1.1;
}

.notes-list p {
  max-width: 48rem;
  margin: 0.6rem 0 0;
  color: var(--obs-muted);
  font-size: 0.89rem;
  line-height: 1.65;
}

.notes-list a {
  padding: 0.4rem 0;
  color: var(--obs-paper);
  font-family: var(--obs-mono);
  font-size: 0.6rem;
  letter-spacing: 0.1em;
  text-decoration-color: var(--obs-signal);
  text-underline-offset: 0.35rem;
  text-transform: uppercase;
}

.notes-list a::after {
  content: " ↗";
  color: var(--obs-signal);
}

.obs-footer {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 2rem;
  padding: 2rem 0 2.5rem;
}

.obs-footer p {
  margin: 0;
}

.obs-footer > div > p:last-child {
  margin-top: 0.35rem;
  color: var(--obs-faint);
  font-family: var(--obs-mono);
  font-size: 0.58rem;
  letter-spacing: 0.08em;
  line-height: 1.5;
  text-transform: uppercase;
}

.obs-footer__statement {
  font-family: var(--obs-display);
  font-size: 1.25rem;
  font-style: italic;
}

.standards-badge {
  display: inline-flex;
  align-items: center;
}

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

.obs-footer__links {
  grid-column: 1 / -1;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.25rem;
  padding-top: 1rem;
  border-top: 1px solid var(--obs-line);
  color: var(--obs-faint);
  font-family: var(--obs-mono);
  font-size: 0.59rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.obs-footer__links a {
  color: var(--obs-muted);
  text-decoration-color: var(--obs-signal);
  text-underline-offset: 0.3rem;
}

.obs-footer__links a:hover {
  color: var(--obs-paper);
}

@keyframes scope-sweep {
  to {
    transform: rotate(360deg);
  }
}

@keyframes node-breathe {
  0%,
  100% {
    opacity: 0.44;
    transform: scale(0.82);
  }

  50% {
    opacity: 1;
    transform: scale(1.16);
  }
}

@media (max-width: 1120px) {
  .obs-header {
    align-items: flex-start;
    padding: 1.1rem 0;
  }

  .obs-nav {
    max-width: none;
  }

  .obs-hero {
    grid-template-columns: 1fr;
  }

  .obs-hero__copy {
    padding-right: clamp(0rem, 4vw, 3rem);
  }

  .scope {
    min-height: 43rem;
    border-top: 1px solid var(--obs-line);
    border-left: 0;
  }

  .scope__chart {
    width: min(76%, 38rem);
  }

  .coordinate__visual {
    height: 14rem;
  }

  .ledger-list li {
    grid-template-columns: 5.5rem minmax(10rem, 0.8fr) minmax(10rem, 0.7fr) 5.5rem minmax(12rem, 1.2fr);
    gap: 0.8rem;
  }
}

@media (max-width: 820px) {
  .observatory-shell {
    width: min(100% - 1.25rem, 44rem);
  }

  .obs-header {
    display: grid;
    gap: 1rem;
  }

  .obs-nav {
    justify-content: flex-start;
    max-width: none;
  }

  .obs-nav a {
    padding: 0.55rem 0.6rem 0.55rem 0;
  }

  .obs-hero {
    min-height: auto;
  }

  .obs-hero__copy {
    padding: 4.5rem 0;
  }

  .obs-hero h1 {
    font-size: clamp(3.8rem, 9vw, 5.8rem);
  }

  .scope {
    display: grid;
    grid-template-columns: 1fr;
    min-height: auto;
    padding: 1.25rem;
  }

  .scope::after {
    inset: 0;
  }

  .scope__heading,
  .scope__chart,
  .scope-point,
  .scope figcaption {
    position: relative;
    inset: auto;
  }

  .scope__heading {
    margin: 0.25rem 0 0;
    padding: 0.85rem 0;
  }

  .scope__chart {
    top: auto;
    left: auto;
    width: min(100%, 34rem);
    margin: 0 auto;
    transform: none;
  }

  .scope-point {
    width: 100%;
    min-width: 0;
    margin-top: 0.55rem;
  }

  .scope-point::after {
    display: none;
  }

  .scope-point:hover {
    transform: translateX(2px);
  }

  .scope figcaption {
    margin-top: 1.2rem;
    padding: 1rem 0 0;
  }

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

  .signal-strip p:nth-child(3) {
    border-left: 0;
  }

  .signal-strip p:nth-child(n + 3) {
    border-top: 1px solid var(--obs-line);
  }

  .constellation,
  .ledger,
  .charter,
  .field-notes {
    padding: 4.5rem 0;
  }

  .section-head--split {
    grid-template-columns: 1fr;
    align-items: start;
    gap: 1.25rem;
  }

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

  .coordinate + .coordinate {
    border-top: 1px solid var(--obs-line);
    border-left: 0;
  }

  .coordinate__visual {
    height: 14rem;
  }

  .ledger-list li {
    grid-template-columns: 5.2rem minmax(0, 1fr) auto;
    gap: 0.55rem 1rem;
    padding: 1.2rem 0;
  }

  .ledger-list__id {
    grid-column: 1;
  }

  .ledger-list li > strong {
    grid-column: 2;
  }

  .ledger-list__status {
    grid-column: 3;
  }

  .ledger-list__scope {
    grid-column: 2 / -1;
  }

  .ledger-list li > p {
    grid-column: 2 / -1;
  }

  .charter::before {
    display: none;
  }

  .charter {
    margin-right: -0.625rem;
    margin-left: -0.625rem;
    padding-right: 0.625rem;
    padding-left: 0.625rem;
  }

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

  .charter-grid article {
    min-height: auto;
  }

  .charter-grid article + article {
    border-top: 1px solid var(--obs-line);
    border-left: 0;
  }

  .charter-grid h3 {
    margin-top: 1.8rem;
  }

  .privacy-plate {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  .privacy-plate a {
    min-width: 0;
  }

  .notes-list article {
    grid-template-columns: 5.5rem minmax(0, 1fr);
    gap: 1.25rem;
  }

  .notes-list a {
    grid-column: 2;
    justify-self: start;
  }
}

@media (max-width: 520px) {
  .brand__seal {
    width: 2.8rem;
    height: 2.8rem;
  }

  .brand__copy strong {
    font-size: 0.7rem;
  }

  .brand__copy span {
    font-size: 0.58rem;
  }

  .obs-nav {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    width: 100%;
    border-top: 1px solid var(--obs-line);
  }

  .obs-nav a {
    padding: 0.65rem 0;
    border-bottom: 1px solid var(--obs-line);
    font-size: 0.59rem;
  }

  .obs-nav a:nth-child(even) {
    padding-left: 0.75rem;
    border-left: 1px solid var(--obs-line);
  }

  .obs-hero h1 {
    font-size: clamp(3.05rem, 14vw, 4.2rem);
    line-height: 0.96;
  }

  .obs-hero h1 em {
    margin: 0.08em 0 0.15em;
    padding-left: 0.2em;
    line-height: 0.94;
  }

  .obs-actions {
    display: grid;
  }

  .obs-button {
    width: 100%;
  }

  .obs-hero__facts {
    grid-template-columns: 1fr;
  }

  .obs-hero__facts div {
    padding: 0.75rem 0;
  }

  .obs-hero__facts div + div {
    padding-left: 0;
    border-top: 1px solid var(--obs-line);
    border-left: 0;
  }

  .scope {
    padding: 0.85rem;
  }

  .scope__heading {
    display: grid;
    gap: 0.35rem;
  }

  .scope__chart {
    width: 112%;
    margin-left: -6%;
  }

  .signal-strip strong {
    font-size: 1.15rem;
  }

  .signal-strip p {
    padding: 0.95rem 0.75rem;
  }

  .section-head h2 {
    font-size: clamp(2.5rem, 13vw, 3.7rem);
  }

  .coordinate {
    padding: 1.2rem 0.85rem;
  }

  .coordinate__topline {
    display: grid;
  }

  .coordinate__topline strong {
    text-align: left;
  }

  .ledger-list li {
    grid-template-columns: 1fr auto;
  }

  .ledger-list__id {
    grid-column: 1;
  }

  .ledger-list__status {
    grid-column: 2;
  }

  .ledger-list li > strong,
  .ledger-list__scope,
  .ledger-list li > p {
    grid-column: 1 / -1;
  }

  .notes-list article {
    grid-template-columns: 1fr;
    gap: 0.55rem;
  }

  .notes-list a {
    grid-column: 1;
  }

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

  .standards-badge {
    justify-self: start;
  }
}

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

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