:root {
  color-scheme: dark light;
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-5: 40px;
  --space-6: 48px;
  --space-8: 64px;
  --space-12: 96px;
  --radius-atom: 4px;
  --field: #031012;
  --field-deep: #010809;
  --surface: rgb(6 28 29 / 88%);
  --surface-solid: #061c1d;
  --ink: #f3fbf7;
  --ink-soft: #abc7c0;
  --line: #397069;
  --line-hot: #62ead8;
  --signal: #ffd75f;
  --signal-ink: #1a1500;
  --interference: #ff4f98;
  --shadow: rgb(0 0 0 / 40%);
  --font-sans: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: "SFMono-Regular", "Roboto Mono", Consolas, "Liberation Mono", monospace;
}

* {
  box-sizing: border-box;
}

html {
  min-height: 100%;
  background: var(--field-deep);
  scroll-behavior: smooth;
}

body {
  min-height: 100svh;
  margin: 0;
  overflow-x: hidden;
  background:
    linear-gradient(120deg, rgb(82 234 216 / 4%), transparent 42%),
    radial-gradient(circle at 80% 14%, rgb(255 79 152 / 7%), transparent 24%),
    var(--field);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.5;
}

button,
a {
  font: inherit;
}

a {
  color: inherit;
}

.skip-link {
  position: fixed;
  z-index: 20;
  top: var(--space-2);
  left: var(--space-2);
  padding: var(--space-1) var(--space-2);
  transform: translateY(calc(-100% - var(--space-4)));
  border: 2px solid var(--signal);
  background: var(--field);
  color: var(--ink);
  transition: transform 180ms cubic-bezier(0.2, 0.8, 0.2, 1);
}

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

.terrain,
.atmosphere {
  position: fixed;
  z-index: 0;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

.terrain {
  opacity: 0.78;
}

.atmosphere {
  background-image:
    linear-gradient(rgb(98 234 216 / 6%) 1px, transparent 1px),
    linear-gradient(90deg, rgb(98 234 216 / 6%) 1px, transparent 1px);
  background-size: 4rem 4rem;
  mask-image: linear-gradient(to bottom, rgb(0 0 0 / 18%), black 82%);
}

.arrival {
  position: relative;
  z-index: 1;
  width: min(100%, 100rem);
  min-height: 100svh;
  margin-inline: auto;
  padding-inline: clamp(var(--space-2), 4vw, var(--space-8));
}

.masthead {
  min-height: 5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  border-bottom: 1px solid var(--line);
}

.mark {
  min-height: 3rem;
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  text-decoration: none;
}

.mark__glyph {
  min-width: 3rem;
  min-height: 3rem;
  display: grid;
  place-items: center;
  border: 1px solid var(--line-hot);
  border-radius: var(--radius-atom);
  color: var(--line-hot);
  font: 700 1rem/1 var(--font-mono);
}

.mark__name,
.masthead__channel,
.eyebrow,
.channel__heading,
.field-notes__index,
.footer {
  font-family: var(--font-mono);
  letter-spacing: 0.12em;
}

.mark__name {
  font-weight: 700;
}

.masthead__channel {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.75rem;
}

.hero {
  min-height: min(50rem, calc(100svh - 5rem));
  display: grid;
  grid-template-columns: minmax(0, 1.45fr) minmax(19rem, 0.8fr);
  align-items: center;
  gap: clamp(var(--space-4), 6vw, var(--space-12));
  padding-block: clamp(var(--space-8), 9vw, 9rem);
}

.hero__copy {
  min-width: 0;
}

.eyebrow {
  margin: 0 0 var(--space-3);
  color: var(--line-hot);
  font-size: 0.75rem;
  font-weight: 700;
  text-wrap: balance;
}

.hero h1,
.lost-signal h1 {
  margin: 0;
  max-width: 100%;
  color: var(--ink);
  font-size: clamp(4rem, 11.5vw, 11.5rem);
  font-weight: 520;
  letter-spacing: -0.075em;
  line-height: 0.82;
}

.hero h1 span,
.lost-signal h1 span {
  color: var(--signal);
}

.lede {
  max-width: 44rem;
  margin: var(--space-5) 0 0;
  color: var(--ink-soft);
  font-size: 1.3125rem;
  line-height: 1.6;
  text-wrap: pretty;
}

/* Bind only the final three words. The phrase still fits at 320px and 200%. */
.lede__storage {
  white-space: nowrap;
}

.channel {
  position: relative;
  min-width: 0;
  padding: var(--space-4);
  border: 1px solid var(--line-hot);
  border-radius: var(--radius-atom);
  background: var(--surface);
  box-shadow: var(--space-1) var(--space-1) 0 rgb(98 234 216 / 14%), 0 2rem 5rem var(--shadow);
  backdrop-filter: blur(1rem);
}

.channel__edge {
  position: absolute;
  inset: -1px;
  border-radius: inherit;
  pointer-events: none;
  background:
    linear-gradient(var(--signal), var(--signal)) 0 0 / var(--space-4) 2px no-repeat,
    linear-gradient(var(--signal), var(--signal)) 100% 100% / var(--space-4) 2px no-repeat;
}

.channel__heading {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  color: var(--ink-soft);
  font-size: 0.6875rem;
  font-weight: 700;
}

.channel__heading p {
  margin: 0;
}

.channel__number {
  margin-left: auto !important;
  text-align: right;
}

.channel__light {
  width: var(--space-1);
  height: var(--space-1);
  flex: 0 0 var(--space-1);
  background: var(--signal);
  box-shadow: 0 0 var(--space-2) var(--signal);
}

.channel__signal {
  position: relative;
  height: 7rem;
  margin-block: var(--space-3);
  overflow: hidden;
  border-block: 1px solid var(--line);
  background:
    linear-gradient(90deg, transparent 49.8%, rgb(98 234 216 / 14%) 50%, transparent 50.2%),
    linear-gradient(rgb(98 234 216 / 8%) 1px, transparent 1px);
  background-size: 100% 100%, 100% var(--space-2);
}

.channel__signal-line {
  position: absolute;
  top: 50%;
  left: 8%;
  width: 84%;
  height: 1px;
  transform: scaleX(0.08);
  transform-origin: left center;
  background: linear-gradient(90deg, var(--line-hot), var(--signal));
  opacity: 0.35;
  transition:
    transform 480ms cubic-bezier(0.22, 1, 0.36, 1),
    opacity 280ms ease;
}

.channel__ship {
  position: absolute;
  top: 50%;
  right: 7%;
  width: var(--space-2);
  height: var(--space-2);
  transform: translateY(-50%) rotate(45deg);
  border: 2px solid var(--ink-soft);
  background: var(--surface-solid);
  transition:
    border-color 280ms ease,
    box-shadow 480ms ease,
    transform 480ms cubic-bezier(0.22, 1, 0.36, 1);
}

html[data-state="ready"] .channel__signal-line {
  transform: scaleX(1);
  opacity: 1;
}

html[data-state="ready"] .channel__ship {
  transform: translateY(-50%) rotate(225deg);
  border-color: var(--signal);
  box-shadow: 0 0 var(--space-3) var(--signal);
}

.channel__message {
  min-height: 8rem;
}

.channel__state {
  margin: 0 0 var(--space-1);
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  font-weight: 620;
  letter-spacing: -0.035em;
  line-height: 1.1;
}

.channel__detail,
.channel__noscript {
  margin: 0;
  color: var(--ink-soft);
  text-wrap: pretty;
}

.channel__actions {
  display: grid;
  gap: var(--space-2);
  margin-top: var(--space-3);
}

.button {
  min-height: 3.5rem;
  padding: 0 var(--space-2);
  display: inline-flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  border: 1px solid var(--line-hot);
  border-radius: var(--radius-atom);
  background: transparent;
  color: var(--ink);
  font-weight: 750;
  text-decoration: none;
  cursor: pointer;
  transition:
    transform 180ms cubic-bezier(0.22, 1, 0.36, 1),
    background-color 180ms ease,
    border-color 180ms ease,
    opacity 180ms ease;
}

.button--primary {
  background: var(--signal);
  border-color: var(--signal);
  color: var(--signal-ink);
}

.button:hover {
  transform: translateY(-2px);
}

.button:active {
  transform: translateY(0) scale(0.99);
}

.button:focus-visible,
.mark:focus-visible {
  outline: 3px solid var(--interference);
  outline-offset: 4px;
}

.channel__noscript {
  margin-top: var(--space-2);
  padding-top: var(--space-2);
  border-top: 1px solid var(--line);
  font-size: 0.875rem;
}

.architecture {
  padding-block: clamp(var(--space-8), 9vw, var(--space-12));
  border-top: 1px solid var(--line);
}

.architecture__header {
  min-width: 0;
  max-width: 64rem;
  margin-bottom: clamp(var(--space-5), 6vw, var(--space-8));
}

.architecture__header h2 {
  max-width: 17ch;
  margin: 0;
  font-size: clamp(1.75rem, 11vw, 6.5rem);
  font-weight: 540;
  letter-spacing: -0.06em;
  line-height: 0.94;
  text-wrap: balance;
}

.architecture__header > p:last-child {
  max-width: 58ch;
  margin: var(--space-3) 0 0;
  color: var(--ink-soft);
  font-size: clamp(1rem, 1.5vw, 1.1875rem);
  text-wrap: pretty;
}

.architecture__map {
  display: grid;
  gap: var(--space-2);
}

.architecture__core {
  position: relative;
  min-width: 0;
  padding: var(--space-4);
  overflow: hidden;
  border: 1px solid var(--signal);
  border-radius: var(--radius-atom);
  background:
    linear-gradient(90deg, transparent 49.8%, rgb(98 234 216 / 12%) 50%, transparent 50.2%),
    linear-gradient(rgb(98 234 216 / 7%) 1px, transparent 1px),
    var(--surface);
  background-size: 100% 100%, 100% var(--space-2), 100% 100%;
  box-shadow: var(--space-1) var(--space-1) 0 rgb(255 215 95 / 12%);
}

.architecture__core::after {
  position: absolute;
  right: var(--space-3);
  bottom: var(--space-3);
  width: var(--space-2);
  height: var(--space-2);
  transform: rotate(45deg);
  border: 2px solid var(--signal);
  background: var(--surface-solid);
  box-shadow: 0 0 var(--space-3) rgb(255 215 95 / 28%);
  content: "";
}

.architecture__utility,
.architecture__status,
.system-layer summary span {
  font-family: var(--font-mono);
  letter-spacing: 0.12em;
}

.architecture__utility {
  margin: 0 0 var(--space-4);
  color: var(--signal);
  font-size: 0.75rem;
  font-weight: 700;
}

.architecture__name {
  margin: 0;
  color: var(--ink);
  font: 700 clamp(1.75rem, 14vw, 4.5rem)/0.9 var(--font-mono);
  letter-spacing: -0.06em;
}

.architecture__status {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  margin: var(--space-3) 0 var(--space-2);
  color: var(--ink-soft);
  font-size: 0.6875rem;
  font-weight: 700;
}

.architecture__status span {
  width: var(--space-1);
  height: var(--space-1);
  flex: 0 0 var(--space-1);
  background: var(--signal);
  box-shadow: 0 0 var(--space-2) var(--signal);
}

.architecture__core > p:last-child {
  max-width: 34ch;
  margin: 0;
  padding-right: var(--space-5);
  color: var(--ink-soft);
  text-wrap: pretty;
}

.architecture__layers {
  min-width: 0;
  display: grid;
  gap: var(--space-1);
}

.system-layer {
  min-width: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius-atom);
  background: rgb(3 16 18 / 74%);
  transition:
    border-color 180ms ease,
    background-color 180ms ease,
    box-shadow 180ms ease;
}

.system-layer[open] {
  border-color: var(--signal);
  background: var(--surface);
  box-shadow: var(--space-1) var(--space-1) 0 rgb(255 215 95 / 10%);
}

.system-layer summary {
  min-height: 4.5rem;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2);
  color: var(--ink);
  cursor: pointer;
  list-style: none;
}

.system-layer summary::-webkit-details-marker {
  display: none;
}

.system-layer summary::after {
  width: var(--space-1);
  height: var(--space-1);
  flex: 0 0 var(--space-1);
  grid-column: 2;
  grid-row: 1 / 3;
  transform: rotate(45deg);
  border: 1px solid var(--line-hot);
  content: "";
  transition:
    transform 180ms cubic-bezier(0.22, 1, 0.36, 1),
    background-color 180ms ease,
    border-color 180ms ease;
}

.system-layer[open] summary::after {
  transform: rotate(225deg);
  border-color: var(--signal);
  background: var(--signal);
}

.system-layer summary span {
  min-width: 0;
  grid-column: 1;
  color: var(--ink-soft);
  font-size: 0.6875rem;
  font-weight: 700;
}

.system-layer summary strong {
  min-width: 0;
  grid-column: 1;
  margin: 0;
  font-size: 0.9375rem;
  text-align: left;
}

.system-layer > p {
  margin: 0;
  padding: 0 var(--space-2) var(--space-2);
  color: var(--ink-soft);
  text-wrap: pretty;
}

.system-layer summary:focus-visible {
  outline: 3px solid var(--interference);
  outline-offset: 4px;
}

.field-notes {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}

.field-notes article {
  min-width: 0;
  padding: var(--space-4);
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: rgb(3 16 18 / 74%);
}

.field-notes__index {
  margin: 0 0 var(--space-4);
  color: var(--signal);
  font-size: 0.75rem;
}

.field-notes h2 {
  margin: 0 0 var(--space-1);
  font-size: 1.125rem;
  text-wrap: balance;
}

.field-notes article > p:last-child {
  margin: 0;
  color: var(--ink-soft);
  text-wrap: pretty;
}

.footer {
  min-height: 6rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  color: var(--ink-soft);
  font-size: 0.6875rem;
}

.footer p {
  margin: 0;
}

.not-found {
  display: grid;
  place-items: center;
  padding: var(--space-2);
}

.lost-signal {
  width: min(100%, 54rem);
  padding: clamp(var(--space-3), 6vw, var(--space-8));
  border: 1px solid var(--line-hot);
  border-radius: var(--radius-atom);
  background: var(--surface);
  box-shadow: var(--space-1) var(--space-1) 0 rgb(98 234 216 / 14%);
}

.lost-signal h1 {
  font-size: clamp(3rem, 10vw, 7rem);
}

.lost-signal > p:not(.eyebrow) {
  max-width: 38rem;
  margin-block: var(--space-4);
  color: var(--ink-soft);
  font-size: 1.125rem;
}

.lost-signal .button {
  width: min(100%, 24rem);
}

[hidden] {
  display: none !important;
}

@media (max-width: 63.9375rem) {
  .hero {
    grid-template-columns: 1fr;
    min-height: auto;
    gap: var(--space-6);
  }

  .hero h1 {
    font-size: clamp(4rem, 17vw, 9rem);
  }

  .channel {
    width: min(100%, 42rem);
  }
}

@media (min-width: 64rem) {
  .architecture__map {
    grid-template-columns: minmax(18rem, 0.78fr) minmax(0, 1.4fr);
    align-items: stretch;
  }

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

  .system-layer:last-child {
    grid-column: 1 / -1;
  }
}

@media (max-width: 64rem) {
  .lede {
    max-width: 42rem;
    font-size: 1.1875rem;
  }
}

/* 768px is the exact seam where three field-note columns strand words. */
@media (max-width: 48rem) {
  .field-notes {
    grid-template-columns: 1fr;
  }

  .system-layer > p,
  .field-notes article > p:last-child {
    text-wrap: balance;
  }
}

@media (max-width: 47.9375rem) {
  .arrival {
    padding-inline: var(--space-2);
  }

  .masthead__channel {
    max-width: 8rem;
    text-align: right;
  }

  .hero {
    padding-block: var(--space-6);
  }

  .lede {
    max-width: 100%;
    font-size: 1rem;
  }

  .field-notes article {
    padding: var(--space-3);
  }

  .architecture__core {
    padding: var(--space-3);
  }
}

@media (max-width: 27.4375rem) {
  .mark__name {
    display: none;
  }

  .hero {
    padding-block: var(--space-5);
  }

  .hero h1 {
    font-size: 16vw;
    letter-spacing: -0.08em;
  }

  .channel {
    padding: var(--space-2);
  }

  .channel__heading {
    align-items: flex-start;
    flex-wrap: wrap;
  }

  .channel__actions,
  .button {
    min-width: 0;
    width: 100%;
  }

  .channel,
  .channel *,
  .architecture,
  .architecture *,
  .field-notes article,
  .field-notes article * {
    overflow-wrap: anywhere;
  }

  .footer {
    align-items: flex-start;
    flex-direction: column;
    justify-content: center;
  }
}

@media (prefers-color-scheme: light) {
  :root {
    --field: #edf5f0;
    --field-deep: #dfece5;
    --surface: rgb(247 252 248 / 92%);
    --surface-solid: #f7fcf8;
    --ink: #0a2222;
    --ink-soft: #355b55;
    --line: #6b948d;
    --line-hot: #006f63;
    --signal: #8a5800;
    --signal-ink: #fffdf6;
    --interference: #b90f59;
    --shadow: rgb(9 45 42 / 16%);
  }

  body {
    background:
      linear-gradient(120deg, rgb(8 126 112 / 6%), transparent 42%),
      radial-gradient(circle at 80% 14%, rgb(185 15 89 / 7%), transparent 24%),
      var(--field);
  }

  .field-notes article {
    background: rgb(247 252 248 / 80%);
  }

  .system-layer {
    background: rgb(247 252 248 / 80%);
  }
}

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

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
    transition-duration: 0.001ms !important;
    transition-property: none !important;
  }
}

@media (forced-colors: active) {
  .terrain,
  .atmosphere,
  .channel__edge,
  .channel__signal {
    display: none;
  }

  .channel,
  .architecture__core,
  .system-layer,
  .field-notes,
  .field-notes article,
  .lost-signal,
  .mark__glyph,
  .button {
    border: 2px solid CanvasText;
    box-shadow: none;
    forced-color-adjust: auto;
  }

  .channel__light {
    background: Highlight;
    box-shadow: none;
  }

  .architecture__status span {
    background: Highlight;
    box-shadow: none;
  }

  .button--primary {
    background: ButtonFace;
    color: ButtonText;
  }
}