:root {
  color-scheme: dark;
  --black: #020100;
  --void: #060403;
  --shell: #0c0806;
  --surface: rgba(17, 11, 8, 0.72);
  --surface-strong: rgba(20, 13, 10, 0.92);
  --copper: #d98a43;
  --copper-bright: #ffbf78;
  --copper-pale: #f7dcc0;
  --bone: #f1e2cd;
  --muted: rgba(241, 226, 205, 0.72);
  --faint: rgba(241, 226, 205, 0.52);
  --line: rgba(255, 179, 102, 0.2);
  --probe: #9ccbd0;
  --probe-soft: rgba(156, 203, 208, 0.72);
  --danger: #ff8f6a;
  --reading-width: 43rem;
  --page-pad: 1.25rem;
  --ui: "Avenir Next", "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  --serif: Iowan Old Style, Palatino, "Palatino Linotype", "Book Antiqua", Georgia, serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  background: var(--black);
}

body {
  margin: 0;
  min-width: 320px;
  color: var(--bone);
  background:
    radial-gradient(circle at 50% -20%, rgba(255, 175, 94, 0.13), transparent 32rem),
    radial-gradient(circle at 12% 18%, rgba(156, 203, 208, 0.07), transparent 20rem),
    linear-gradient(180deg, #020100 0%, #090503 38%, #020100 100%);
  font-family: var(--ui);
  font-size: 16px;
  line-height: 1.5;
  overflow-x: hidden;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -4;
  pointer-events: none;
  opacity: 0.16;
  background-image:
    linear-gradient(rgba(255, 184, 112, 0.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(156, 203, 208, 0.035) 1px, transparent 1px);
  background-size: 42px 42px;
  mask-image: linear-gradient(to bottom, transparent 0%, black 18%, black 82%, transparent 100%);
}

body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -3;
  pointer-events: none;
  background:
    radial-gradient(circle at 50% 34%, transparent 0 16rem, rgba(0, 0, 0, 0.18) 16.2rem, transparent 23rem),
    linear-gradient(90deg, transparent, rgba(255, 184, 112, 0.04), transparent);
  mix-blend-mode: screen;
}

img,
canvas {
  display: block;
}

a {
  color: inherit;
  text-decoration-color: rgba(255, 191, 120, 0.45);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.25em;
}

a:hover,
a:focus-visible {
  color: var(--copper-pale);
  text-decoration-color: var(--copper-bright);
}

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

.ambient-field {
  position: fixed;
  inset: 0;
  z-index: -5;
  width: 100%;
  height: 100%;
}

.site-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.85rem var(--page-pad);
  color: rgba(247, 220, 192, 0.86);
  background: linear-gradient(180deg, rgba(2, 1, 0, 0.8), transparent);
  backdrop-filter: blur(12px);
}

.nav-mark {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  font-size: 0.75rem;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  text-decoration: none;
  white-space: nowrap;
}

.nav-mark::before {
  content: "";
  width: 0.7rem;
  height: 0.7rem;
  border-radius: 50%;
  background: #050302;
  box-shadow:
    0 0 0 1px rgba(255, 191, 120, 0.32),
    0 0 18px rgba(255, 161, 81, 0.52);
}

.site-nav nav {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 1rem;
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.site-nav nav a {
  text-decoration: none;
  color: rgba(241, 226, 205, 0.78);
}

.progress-line {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 30;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--copper), var(--copper-bright), var(--probe));
  transform: scaleX(0);
  transform-origin: left center;
}

.hero {
  position: relative;
  min-height: 100svh;
  display: grid;
  align-items: end;
  overflow: hidden;
  padding: 5.5rem var(--page-pad) 3.25rem;
  isolation: isolate;
}

.hero-canvas {
  position: absolute;
  inset: 0;
  z-index: -2;
  width: 100%;
  height: 100%;
}

.hero-shade {
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    linear-gradient(180deg, rgba(2, 1, 0, 0.05) 0%, rgba(2, 1, 0, 0.22) 45%, rgba(2, 1, 0, 0.88) 100%),
    radial-gradient(circle at 50% 44%, transparent 0 15rem, rgba(2, 1, 0, 0.16) 15.2rem, rgba(2, 1, 0, 0.8) 45rem);
}

.hero-content {
  width: min(78rem, 100%);
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(13rem, 18rem);
  align-items: end;
  gap: 2rem;
}

.hero-copy {
  max-width: 48rem;
  padding-bottom: 1.2rem;
}

.kicker,
.section-kicker,
.data-label {
  margin: 0;
  color: var(--copper-bright);
  font-size: 0.73rem;
  line-height: 1.4;
  letter-spacing: 0.24em;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  text-wrap: pretty;
}

h1 {
  margin: 0.75rem 0 0;
  max-width: 12ch;
  font-size: 4.8rem;
  font-weight: 500;
  line-height: 0.96;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  text-shadow: 0 0 34px rgba(255, 159, 77, 0.16);
}

.hero-subtitle {
  max-width: 38rem;
  margin: 1.2rem 0 0;
  color: rgba(241, 226, 205, 0.82);
  font-family: var(--serif);
  font-size: 1.22rem;
  line-height: 1.75;
}

.hero-actions,
.download-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin-top: 1.45rem;
}

.action-link {
  display: inline-flex;
  align-items: center;
  min-height: 2.75rem;
  padding: 0.8rem 1rem;
  border: 1px solid rgba(255, 191, 120, 0.32);
  background: rgba(12, 8, 6, 0.68);
  color: var(--copper-pale);
  box-shadow: 0 0 24px rgba(255, 146, 64, 0.08);
  text-decoration: none;
  text-transform: uppercase;
  letter-spacing: 0.13em;
  font-size: 0.75rem;
  backdrop-filter: blur(12px);
  transition: border-color 180ms ease, background 180ms ease, transform 180ms ease;
}

.action-link:hover,
.action-link:focus-visible {
  border-color: rgba(255, 191, 120, 0.74);
  background: rgba(36, 21, 12, 0.82);
  transform: translateY(-1px);
}

.action-link.secondary {
  border-color: rgba(156, 203, 208, 0.24);
  color: rgba(218, 244, 247, 0.88);
}

.cover-object {
  position: relative;
  margin: 0;
  justify-self: end;
  width: min(18rem, 100%);
  transform: translateY(0);
}

.cover-object::before {
  content: "";
  position: absolute;
  inset: -1.2rem;
  z-index: -1;
  background:
    radial-gradient(circle at 50% 38%, rgba(255, 170, 88, 0.24), transparent 55%),
    linear-gradient(120deg, rgba(156, 203, 208, 0.08), transparent 42%);
  filter: blur(18px);
}

.cover-object img {
  width: 100%;
  height: auto;
  border: 1px solid rgba(255, 191, 120, 0.26);
  box-shadow:
    0 34px 90px rgba(0, 0, 0, 0.72),
    0 0 0 1px rgba(255, 191, 120, 0.06) inset;
}

.cover-object figcaption {
  margin-top: 0.8rem;
  color: var(--faint);
  font-size: 0.67rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.range-strip {
  position: absolute;
  left: var(--page-pad);
  right: var(--page-pad);
  bottom: 0.9rem;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  max-width: 78rem;
  margin: 0 auto;
  color: rgba(241, 226, 205, 0.56);
  font-size: 0.65rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.range-strip span {
  padding-top: 0.45rem;
  border-top: 1px solid rgba(255, 191, 120, 0.18);
}

.band {
  position: relative;
  padding: 6rem var(--page-pad);
}

.band::before {
  content: "";
  position: absolute;
  top: 0;
  left: 50%;
  width: min(78rem, calc(100% - 2.5rem));
  height: 1px;
  transform: translateX(-50%);
  background: linear-gradient(90deg, transparent, rgba(255, 191, 120, 0.24), rgba(156, 203, 208, 0.18), transparent);
}

.section-inner {
  width: min(78rem, 100%);
  margin: 0 auto;
}

.section-copy {
  max-width: 43rem;
}

.section-copy.center {
  margin-inline: auto;
  text-align: center;
}

.section-copy h2 {
  margin: 0.5rem 0 0;
  color: var(--copper-pale);
  font-size: 2.2rem;
  font-weight: 500;
  line-height: 1.1;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.section-copy p {
  margin: 1rem 0 0;
  color: var(--muted);
  font-family: var(--serif);
  font-size: 1.08rem;
  line-height: 1.8;
}

.interface-grid {
  display: grid;
  grid-template-columns: minmax(18rem, 0.9fr) minmax(26rem, 1.25fr);
  gap: 2rem;
  align-items: center;
  margin-top: 2.5rem;
}

.model-console {
  border: 1px solid rgba(255, 191, 120, 0.18);
  background:
    linear-gradient(180deg, rgba(17, 10, 7, 0.82), rgba(5, 3, 2, 0.58)),
    radial-gradient(circle at 10% 0%, rgba(156, 203, 208, 0.08), transparent 20rem);
  box-shadow: 0 32px 90px rgba(0, 0, 0, 0.38);
}

.readout {
  padding: 1.25rem;
  border-bottom: 1px solid rgba(255, 191, 120, 0.12);
}

.readout h3 {
  margin: 0.45rem 0 0;
  color: var(--bone);
  font-size: 1.4rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.readout p {
  margin: 0.75rem 0 0;
  color: var(--muted);
  font-family: var(--serif);
  line-height: 1.7;
}

.telemetry {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-bottom: 1px solid rgba(255, 191, 120, 0.12);
}

.telemetry div {
  min-height: 5.25rem;
  padding: 1rem 1.25rem;
  border-right: 1px solid rgba(255, 191, 120, 0.1);
}

.telemetry div:nth-child(2n) {
  border-right: 0;
}

.telemetry span {
  display: block;
  color: var(--faint);
  font-size: 0.67rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.telemetry strong {
  display: block;
  margin-top: 0.45rem;
  color: var(--copper-pale);
  font-size: 1rem;
  font-weight: 500;
}

.phase-controls {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: rgba(255, 191, 120, 0.1);
}

.phase-controls button {
  min-height: 3.25rem;
  border: 0;
  border-radius: 0;
  padding: 0.75rem 0.9rem;
  background: rgba(8, 5, 4, 0.94);
  color: rgba(241, 226, 205, 0.72);
  font: inherit;
  font-size: 0.72rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  cursor: pointer;
}

.phase-controls button:hover,
.phase-controls button:focus-visible,
.phase-controls button[aria-pressed="true"] {
  color: var(--copper-pale);
  background: rgba(35, 20, 12, 0.95);
  outline: none;
}

.sphere-stage {
  position: relative;
  min-height: 32rem;
  overflow: hidden;
  border: 1px solid rgba(156, 203, 208, 0.14);
  background:
    radial-gradient(circle at 50% 50%, rgba(255, 174, 95, 0.09), transparent 16rem),
    linear-gradient(180deg, rgba(8, 5, 4, 0.18), rgba(2, 1, 0, 0.55));
}

.sphere-stage canvas {
  width: 100%;
  height: 100%;
  min-height: 32rem;
}

.stage-caption {
  position: absolute;
  left: 1rem;
  right: 1rem;
  bottom: 1rem;
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  color: rgba(241, 226, 205, 0.56);
  font-size: 0.65rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  pointer-events: none;
}

.download-band {
  background:
    radial-gradient(circle at 50% 0%, rgba(156, 203, 208, 0.07), transparent 28rem),
    linear-gradient(180deg, transparent, rgba(17, 10, 7, 0.5), transparent);
}

.download-actions {
  justify-content: center;
}

.archive-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.9rem 1.35rem;
  margin-top: 1.3rem;
  color: var(--faint);
  font-size: 0.74rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

.chapter-layout {
  display: grid;
  grid-template-columns: minmax(11rem, 16rem) minmax(0, var(--reading-width));
  justify-content: center;
  gap: 3.25rem;
  align-items: start;
}

.chapter-aside {
  position: sticky;
  top: 5.2rem;
  color: var(--faint);
}

.chapter-aside h2 {
  margin: 0.55rem 0 0;
  color: var(--copper-pale);
  font-size: 1.2rem;
  font-weight: 500;
  line-height: 1.25;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.chapter-aside p {
  margin: 1rem 0 0;
  font-family: var(--serif);
  line-height: 1.65;
}

.chapter-meter {
  position: relative;
  width: 1px;
  height: 12rem;
  margin-top: 1.5rem;
  background: rgba(255, 191, 120, 0.16);
}

.chapter-meter span {
  position: absolute;
  left: 0;
  top: 0;
  width: 1px;
  height: 0%;
  background: linear-gradient(var(--copper-bright), var(--probe));
  box-shadow: 0 0 14px rgba(255, 191, 120, 0.42);
}

.chapter {
  position: relative;
  padding: 0 0 2rem;
  color: rgba(241, 226, 205, 0.92);
  font-family: var(--serif);
  font-size: 1.1rem;
  line-height: 1.92;
}

.chapter::before {
  content: "";
  position: absolute;
  left: -1.4rem;
  top: 0.45rem;
  bottom: 0;
  width: 1px;
  background: linear-gradient(rgba(255, 191, 120, 0.3), transparent);
}

.chapter h2 {
  margin: 0 0 1.8rem;
  color: var(--copper-pale);
  font-family: var(--ui);
  font-size: 1.5rem;
  font-weight: 500;
  line-height: 1.25;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.chapter p {
  margin: 0 0 1.4rem;
}

.chapter p:first-of-type::first-letter {
  float: left;
  padding: 0.16rem 0.5rem 0 0;
  color: var(--copper-bright);
  font-family: var(--ui);
  font-size: 4.1rem;
  line-height: 0.8;
}

.signal-card {
  margin: 1.4rem 0 1.65rem;
  border: 1px solid rgba(156, 203, 208, 0.22);
  background:
    linear-gradient(180deg, rgba(2, 1, 0, 0.6), rgba(11, 7, 5, 0.76)),
    repeating-linear-gradient(180deg, rgba(156, 203, 208, 0.035), rgba(156, 203, 208, 0.035) 1px, transparent 1px, transparent 8px);
  font-family: var(--ui);
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.22);
}

.signal-title,
.signal-row {
  padding: 0.72rem 0.9rem;
  border-bottom: 1px solid rgba(156, 203, 208, 0.12);
}

.signal-card > :last-child {
  border-bottom: 0;
}

.signal-title {
  color: var(--probe);
  font-size: 0.78rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.signal-row {
  display: grid;
  grid-template-columns: minmax(8rem, 0.7fr) minmax(0, 1fr);
  gap: 1rem;
}

.signal-row span {
  color: var(--faint);
  font-size: 0.68rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

.signal-row strong {
  color: rgba(241, 226, 205, 0.88);
  font-size: 0.84rem;
  font-weight: 500;
  line-height: 1.45;
}

.site-footer {
  padding: 2rem var(--page-pad) 3rem;
  color: rgba(241, 226, 205, 0.54);
}

.footer-inner {
  width: min(78rem, 100%);
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 1rem;
  border-top: 1px solid rgba(255, 191, 120, 0.16);
  padding-top: 1.2rem;
  font-size: 0.68rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

.footer-inner nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem 1.2rem;
}

.reveal {
  opacity: 1;
}

.js .reveal {
  transition: opacity 900ms ease, transform 900ms ease, filter 900ms ease;
}

.js .reveal:not(.is-visible) {
  opacity: 0;
  transform: translateY(18px);
  filter: saturate(0.75);
}

@media (max-width: 980px) {
  h1 {
    font-size: 3.6rem;
  }

  .hero-content,
  .interface-grid,
  .chapter-layout {
    grid-template-columns: 1fr;
  }

  .cover-object {
    justify-self: start;
    width: min(14rem, 50vw);
  }

  .chapter-aside {
    position: relative;
    top: auto;
    max-width: 38rem;
  }

  .chapter-meter {
    display: none;
  }
}

@media (max-width: 680px) {
  :root {
    --page-pad: 1rem;
  }

  .site-nav {
    align-items: flex-start;
  }

  .site-nav nav {
    gap: 0.7rem;
    font-size: 0.64rem;
    letter-spacing: 0.12em;
  }

  .nav-mark {
    max-width: 7rem;
    white-space: normal;
    letter-spacing: 0.18em;
  }

  .hero {
    min-height: 100svh;
    padding-top: 5rem;
  }

  h1 {
    max-width: 8ch;
    font-size: 2.8rem;
    letter-spacing: 0.08em;
  }

  .hero-subtitle,
  .section-copy p,
  .chapter {
    font-size: 1rem;
  }

  .section-copy h2 {
    font-size: 1.7rem;
  }

  .cover-object {
    width: min(12rem, 60vw);
  }

  .range-strip {
    display: none;
  }

  .band {
    padding-block: 4.5rem;
  }

  .telemetry,
  .phase-controls {
    grid-template-columns: 1fr;
  }

  .telemetry div {
    border-right: 0;
  }

  .sphere-stage,
  .sphere-stage canvas {
    min-height: 24rem;
  }

  .stage-caption {
    flex-direction: column;
  }

  .chapter::before {
    display: none;
  }

  .signal-row {
    grid-template-columns: 1fr;
    gap: 0.3rem;
  }
}

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

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
}