:root {
  color-scheme: dark light;
  --canvas: #141617;
  --surface: #1d2021;
  --surface-hover: #1c1f20;
  --selection: #3c3836;
  --text-primary: #cfbc97;
  --text-secondary: #d5c4a1;
  --text-inactive: #928374;
  --text-bright: #fbf1c7;
  --accent: #fabd2f;
  --accent-text: #141617;
  --rule: #3c3836;
  --shadow: rgba(0, 0, 0, 0.32);
}

@media (prefers-color-scheme: light) {
  :root {
    --canvas: #f9f5d7;
    --surface: #fbf1c7;
    --surface-hover: #f2e5bc;
    --selection: #ebdbb2;
    --text-primary: #3c3836;
    --text-secondary: #504945;
    --text-inactive: #665c54;
    --text-bright: #282828;
    --accent: #8a5200;
    --accent-text: #f9f5d7;
    --rule: #d5c4a1;
    --shadow: rgba(60, 56, 54, 0.18);
  }
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 5.5rem;
}

body {
  margin: 0;
  min-width: 0;
  overflow-x: hidden;
  background: var(--canvas);
  color: var(--text-primary);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
  font-size: 1rem;
  line-height: 1.65;
}

a {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  color: var(--text-secondary);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.28em;
}

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

a:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 3px;
}

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

.skip-link {
  position: fixed;
  z-index: 20;
  top: 0.75rem;
  left: 0.75rem;
  padding: 0.75rem 1rem;
  background: var(--accent);
  color: var(--accent-text);
  transform: translateY(-180%);
}

.skip-link:focus {
  transform: none;
}

.site-header {
  min-height: 4rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  padding: 0 clamp(1rem, 4vw, 4rem);
  border-bottom: 1px solid var(--rule);
  background: var(--canvas);
  position: relative;
  z-index: 10;
}

.wordmark {
  gap: 0.65rem;
  color: var(--text-bright);
  font-weight: 800;
  letter-spacing: 0.12em;
  text-decoration: none;
}

.wordmark span {
  color: var(--accent);
}

.site-header nav,
.hero-actions,
.port-links,
.port-jump {
  display: flex;
}

.site-header nav {
  align-items: center;
  gap: clamp(0.25rem, 2vw, 1.5rem);
}

.site-header nav a {
  padding-inline: 0.35rem;
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-decoration: none;
  text-transform: uppercase;
}

.hero {
  min-height: calc(100svh - 4rem);
  display: grid;
  align-content: center;
  padding: clamp(4rem, 10vw, 9rem) clamp(1rem, 8vw, 8rem);
  border-bottom: 1px solid var(--rule);
  position: relative;
}

.hero::after {
  content: "APOLLO / TWO SKIES";
  position: absolute;
  right: clamp(1rem, 4vw, 4rem);
  bottom: 1rem;
  color: var(--text-inactive);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
}

.eyebrow,
.port-index,
.appearance-kicker {
  color: var(--text-inactive);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.13em;
  line-height: 1.4;
  text-transform: uppercase;
}

.hero h1 {
  max-width: 11ch;
  margin: 0.45rem 0 1.5rem;
  color: var(--text-bright);
  font-size: clamp(3.2rem, 10vw, 9rem);
  font-weight: 750;
  letter-spacing: -0.075em;
  line-height: 0.84;
}

.thesis {
  max-width: 62ch;
  margin: 0;
  color: var(--text-secondary);
  font-size: clamp(1rem, 2vw, 1.35rem);
}

.hero-actions {
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 2.25rem;
}

.hero-actions a {
  padding: 0.45rem 1rem;
  border: 1px solid var(--rule);
  text-decoration: none;
}

.hero-actions .primary-action {
  border-color: var(--accent);
  background: var(--accent);
  color: var(--accent-text);
  font-weight: 800;
}

.signal-path {
  padding: 3rem clamp(1rem, 8vw, 8rem);
  border-bottom: 1px solid var(--rule);
  background: var(--surface);
}

.signal-line {
  position: relative;
  height: 1px;
  margin: 0 1rem;
  background: var(--text-inactive);
}

.signal-line::before {
  content: "";
  position: absolute;
  left: 0;
  top: -1px;
  width: 25%;
  height: 3px;
  background: var(--accent);
  animation: trace 3s ease-in-out infinite alternate;
}

.signal-node {
  position: absolute;
  top: -5px;
  width: 11px;
  height: 11px;
  border: 2px solid var(--text-inactive);
  background: var(--surface);
}

.signal-node:nth-child(1) { left: 0; }
.signal-node:nth-child(2) { left: 33.33%; }
.signal-node:nth-child(3) { left: 66.66%; }
.signal-node:nth-child(4) { right: 0; }

.signal-node.live {
  border-color: var(--accent);
  background: var(--accent);
}

.signal-path ol {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1rem;
  margin: 1.25rem 0 0;
  padding: 0;
}

.signal-path li {
  min-width: 0;
  display: flex;
  flex-direction: column;
  color: var(--text-secondary);
  font-size: 0.75rem;
}

.signal-path strong {
  color: var(--text-secondary);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
}

.palette-section,
.ports,
.source-section,
.credits {
  padding: clamp(4rem, 8vw, 8rem) clamp(1rem, 8vw, 8rem);
  border-bottom: 1px solid var(--rule);
}

.section-heading {
  display: grid;
  grid-template-columns: minmax(12rem, 1fr) minmax(16rem, 2fr);
  gap: 1rem 3rem;
  align-items: end;
  margin-bottom: 4rem;
}

.section-heading .eyebrow {
  grid-column: 1 / -1;
  margin: 0;
}

.section-heading h2,
.source-section h2,
.credits h2 {
  margin: 0;
  color: var(--text-bright);
  font-size: clamp(2rem, 5vw, 4.8rem);
  letter-spacing: -0.05em;
  line-height: 0.98;
}

.section-heading p,
.source-section p:last-child,
.credits p:last-child {
  max-width: 58ch;
  margin: 0;
  color: var(--text-secondary);
}

.palette-pair {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(2rem, 5vw, 5rem);
}

.palette-table {
  min-width: 0;
  scroll-margin-top: 5rem;
}

.palette-table-heading {
  min-height: 9rem;
  display: grid;
  align-content: start;
  grid-template-columns: 1fr auto;
  gap: 0 1rem;
  padding: 1.25rem;
  border: 1px solid var(--rule);
  background: var(--surface);
}

.palette-table-heading .appearance-kicker {
  grid-column: 1 / -1;
  margin: 0 0 0.25rem;
}

.palette-table-heading h3 {
  margin: 0;
  color: var(--text-bright);
  font-size: clamp(1.5rem, 3vw, 2.5rem);
  letter-spacing: -0.04em;
  line-height: 1;
}

.palette-table-heading a {
  font-size: 0.72rem;
}

.palette-group {
  margin-top: 2rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--rule);
}

.palette-group h4 {
  margin: 0 0 1rem;
  color: var(--text-secondary);
  font-size: 0.85rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.palette-strip {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  margin: 0;
  padding: 0;
  border-left: 1px solid var(--rule);
}

.base-strip {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.swatch {
  position: relative;
  min-width: 0;
  min-height: 8.75rem;
  display: flex;
  flex-direction: column;
  padding: 0.65rem;
  border: solid var(--rule);
  border-width: 1px 1px 1px 0;
}

.swatch-color {
  height: 4.25rem;
  margin: -0.65rem -0.65rem 0.75rem;
  border-bottom: 1px solid var(--rule);
  background: var(--swatch);
}

.swatch-name {
  overflow: hidden;
  color: var(--text-secondary);
  font-size: 0.72rem;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.swatch code {
  color: var(--text-inactive);
  font-size: 0.67rem;
}

.restricted {
  position: absolute;
  right: 0.4rem;
  top: 0.35rem;
  padding: 0.1rem 0.35rem;
  background: var(--canvas);
  color: var(--text-secondary);
  font-size: 0.58rem;
  text-transform: uppercase;
}

.port-jump {
  flex-wrap: wrap;
  margin-bottom: 5rem;
  border-top: 1px solid var(--rule);
  border-left: 1px solid var(--rule);
}

.port-jump a {
  flex: 1 0 8rem;
  justify-content: center;
  padding: 0.35rem 0.7rem;
  border: solid var(--rule);
  border-width: 0 1px 1px 0;
  font-size: 0.72rem;
  text-decoration: none;
}

.app-port {
  display: grid;
  grid-template-columns: minmax(14rem, 0.72fr) minmax(0, 2fr);
  gap: clamp(2rem, 5vw, 5rem);
  align-items: start;
  padding: clamp(4rem, 8vw, 8rem) 0;
  border-top: 1px solid var(--rule);
  scroll-margin-top: 4rem;
}

.port-copy {
  position: sticky;
  top: 2rem;
  min-width: 0;
}

.port-index {
  margin: 0 0 0.7rem;
}

.port-copy h2 {
  margin: 0;
  overflow-wrap: anywhere;
  color: var(--text-bright);
  font-size: clamp(2rem, 5vw, 4.5rem);
  letter-spacing: -0.055em;
  line-height: 1;
}

.port-copy > p:not(.port-index) {
  max-width: 34ch;
  color: var(--text-secondary);
}

.port-links {
  flex-direction: column;
  align-items: flex-start;
  margin-top: 1.5rem;
}

.appearance-pair {
  min-width: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(1rem, 2.5vw, 2rem);
}

.preview {
  min-width: 0;
  margin: 0;
  border: 1px solid var(--rule);
  background: var(--surface);
  box-shadow: 0 0.65rem 1.75rem var(--shadow);
  scroll-margin-top: 5rem;
}

.preview:target {
  outline: 3px solid var(--accent);
  outline-offset: 4px;
}

.preview-link {
  width: 100%;
  padding: 0;
}

.preview-link img {
  width: 100%;
  aspect-ratio: 1200 / 630;
}

.preview figcaption {
  min-height: 5.5rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 0.15rem;
  padding: 0.75rem 1rem;
  border-top: 1px solid var(--rule);
  overflow-wrap: anywhere;
  color: var(--text-inactive);
  font-size: 0.65rem;
  letter-spacing: 0.04em;
}

.appearance-label {
  color: var(--text-bright);
  font-size: 0.83rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.source-section,
.credits {
  display: grid;
  grid-template-columns: minmax(12rem, 1fr) minmax(16rem, 2fr);
  gap: 1rem 3rem;
}

.source-section .eyebrow,
.credits .eyebrow {
  grid-column: 1 / -1;
  margin: 0;
}

footer {
  min-height: 6rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem clamp(1rem, 8vw, 8rem);
  color: var(--text-inactive);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
}

@keyframes trace {
  to { transform: translateX(300%); }
}

@media (max-width: 1180px) {
  .palette-pair,
  .app-port {
    grid-template-columns: 1fr;
  }

  .port-copy {
    position: static;
  }

  .port-links {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 1rem;
  }
}

@media (max-width: 767px) {
  html {
    scroll-padding-top: 1rem;
  }

  .site-header {
    align-items: flex-start;
    flex-direction: column;
    gap: 0;
    padding-block: 0.65rem;
  }

  .site-header nav {
    width: 100%;
    justify-content: space-between;
  }

  .hero {
    min-height: 38rem;
  }

  .hero h1 {
    font-size: clamp(3rem, 17vw, 5rem);
  }

  .signal-path ol {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.5rem;
  }

  .signal-node:nth-child(2),
  .signal-node:nth-child(3) {
    display: none;
  }

  .section-heading,
  .source-section,
  .credits {
    grid-template-columns: minmax(0, 1fr);
  }

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

  .appearance-pair {
    grid-template-columns: 1fr;
  }

  .app-port {
    padding-block: 4rem;
  }

  .port-jump a {
    flex-basis: 50%;
  }

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

  .source-section h2,
  .credits h2 {
    font-size: 2.5rem;
  }
}

@media (max-width: 390px) {
  .site-header nav,
  .hero-actions,
  .port-links {
    width: 100%;
    align-items: stretch;
    flex-direction: column;
    gap: 0.25rem;
  }

  .site-header nav a,
  .hero-actions a,
  .port-links a {
    width: 100%;
  }

  .site-header nav a {
    font-size: 0.65rem;
  }

  .hero,
  .signal-path,
  .palette-section,
  .ports,
  .source-section,
  .credits,
  footer {
    padding-inline: 0.75rem;
  }

  .hero > *,
  .app-port > *,
  .palette-table-heading > * {
    min-width: 0;
  }

  .hero h1 {
    font-size: clamp(1.75rem, 15vw, 4rem);
    letter-spacing: -0.06em;
    overflow-wrap: anywhere;
  }

  .hero::after {
    right: 0.75rem;
  }

  .signal-path ol {
    grid-template-columns: 1fr;
    font-size: 0.68rem;
  }

  .palette-table-heading {
    grid-template-columns: 1fr;
  }

  .palette-strip,
  .base-strip {
    grid-template-columns: 1fr;
  }

  .swatch-name,
  .swatch code {
    font-size: 0.72rem;
  }

  .port-copy h2 {
    font-size: clamp(1.5rem, 10vw, 2rem);
  }

  .port-jump a {
    flex-basis: 100%;
  }

  .preview figcaption {
    padding-inline: 0.75rem;
    font-size: 0.58rem;
  }

  .source-section h2,
  .credits h2 {
    font-size: clamp(1.6rem, 10vw, 2.5rem);
    overflow-wrap: anywhere;
  }

  footer a {
    padding-inline: 0;
  }
}

@media (max-width: 220px) {
  body {
    font-size: 0.9rem;
  }

  .site-header,
  .hero,
  .signal-path,
  .palette-section,
  .ports,
  .source-section,
  .credits,
  footer {
    padding-inline: 0.5rem;
  }

  .wordmark {
    max-width: 100%;
    overflow-wrap: anywhere;
    font-size: 0.78rem;
  }

  .hero h1 {
    font-size: 1.65rem;
  }

  .section-heading h2,
  .palette-table-heading h3,
  .port-copy h2,
  .source-section h2,
  .credits h2 {
    font-size: 1.35rem;
  }

  .port-jump a,
  .site-header nav a,
  .hero-actions a {
    padding-inline: 0.35rem;
    overflow-wrap: anywhere;
  }
}

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

  .signal-line::before {
    width: 25%;
    animation: none;
  }

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