:root {
  color-scheme: dark;
  --void: #050605;
  --void-2: #0a0d08;
  --acid: #ccff00;
  --phosphor: #e9ff9a;
  --quiet: #8d9287;
  --rule: rgba(204, 255, 0, 0.18);
  --rule-strong: rgba(204, 255, 0, 0.48);
  --fault: #ff4c3f;
  --mono: "Spline Sans Mono", ui-monospace, SFMono-Regular, Consolas, monospace;
  --sans: "Hanken Grotesk", Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  min-width: 320px;
  background: var(--void);
}

body {
  min-height: 100vh;
  margin: 0;
  overflow-x: hidden;
  background:
    radial-gradient(circle at 65% 18%, rgba(204, 255, 0, 0.09), transparent 25rem),
    linear-gradient(rgba(204, 255, 0, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(204, 255, 0, 0.035) 1px, transparent 1px),
    var(--void);
  background-size: auto, 48px 48px, 48px 48px, auto;
  color: var(--phosphor);
  font-family: var(--mono);
}

button,
a {
  font: inherit;
}

a {
  color: inherit;
}

.shell {
  width: min(1500px, calc(100% - 48px));
  margin: 0 auto;
}

.machine-head {
  min-height: 62px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  border-bottom: 1px solid var(--rule-strong);
  color: var(--quiet);
  font-size: 10px;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

.machine-head a {
  text-decoration: none;
}

.machine-head a:hover,
.machine-head a:focus-visible {
  color: var(--acid);
}

.head-code {
  display: flex;
  align-items: center;
  gap: 12px;
}

.head-code::before {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--acid);
  box-shadow: 0 0 15px rgba(204, 255, 0, 0.75);
  content: "";
}

.hero {
  min-height: 680px;
  padding: clamp(64px, 9vw, 142px) 0 72px;
  display: grid;
  align-content: center;
}

.hero-title {
  margin: 0 0 44px;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 24px;
}

.hero-title h1 {
  margin: 0;
  color: var(--phosphor);
  font-family: var(--sans);
  font-size: clamp(54px, 9vw, 146px);
  font-weight: 760;
  letter-spacing: -0.075em;
  line-height: 0.78;
}

.hero-title h1 span {
  color: var(--acid);
  font-weight: 360;
}

.compression {
  margin: 0;
  color: var(--quiet);
  font-size: clamp(9px, 1.1vw, 13px);
  letter-spacing: 0.12em;
  text-align: right;
}

.causal-bus {
  position: relative;
  min-height: 300px;
  display: grid;
  grid-template-columns: minmax(190px, 0.75fr) minmax(260px, 1.3fr) minmax(210px, 0.85fr);
  align-items: center;
  gap: clamp(24px, 5vw, 88px);
}

.causal-bus::before,
.causal-bus::after {
  position: absolute;
  top: 50%;
  height: 1px;
  z-index: -1;
  background: linear-gradient(90deg, transparent, var(--acid), transparent);
  content: "";
}

.causal-bus::before {
  right: 55%;
  left: 7%;
}

.causal-bus::after {
  right: 7%;
  left: 55%;
}

.node-stack {
  display: grid;
  gap: 18px;
}

.node {
  min-height: 50px;
  padding: 12px 14px;
  display: grid;
  grid-template-columns: 25px 1fr;
  align-items: center;
  gap: 9px;
  border: 1px solid var(--rule);
  background: rgba(5, 6, 5, 0.78);
  color: var(--quiet);
  font-size: 10px;
  opacity: 0;
  transform: translateY(6px);
  animation: node-boot 480ms ease forwards;
}

.node:nth-child(2) {
  animation-delay: 90ms;
}

.node:nth-child(3) {
  animation-delay: 180ms;
}

.node:nth-child(4) {
  animation-delay: 270ms;
}

.node b {
  color: var(--acid);
  font-size: 15px;
}

.button-port {
  position: relative;
  min-width: 0;
  padding: 18px;
  border: 0;
  background: transparent;
  color: var(--acid);
  cursor: pointer;
  filter: drop-shadow(0 0 22px rgba(204, 255, 0, 0.12));
}

.button-port::before,
.button-port::after {
  position: absolute;
  inset: 50% auto auto 50%;
  width: min(100%, 520px);
  aspect-ratio: 2.5;
  border: 1px solid rgba(204, 255, 0, 0.18);
  border-radius: 50%;
  content: "";
  pointer-events: none;
  transform: translate(-50%, -50%);
}

.button-port::after {
  width: min(82%, 420px);
  border-color: rgba(204, 255, 0, 0.32);
}

.button-port img {
  position: relative;
  z-index: 2;
  width: min(100%, 430px);
  height: auto;
  display: block;
  margin: auto;
  transform: scale(1.04);
  transition: transform 130ms ease, filter 130ms ease;
}

.button-port:hover img,
.button-port:focus-visible img {
  filter: brightness(1.16);
  transform: scale(1.075);
}

.button-port:focus-visible {
  outline: 1px solid var(--acid);
  outline-offset: 8px;
}

.button-port.is-pressed img {
  transform: scale(0.98);
}

.terminal {
  margin-top: 64px;
  border: 1px solid var(--rule-strong);
  background: rgba(5, 6, 5, 0.92);
}

.terminal-bar {
  min-height: 48px;
  padding: 10px 14px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  border-bottom: 1px solid var(--rule);
  color: var(--quiet);
  font-size: 10px;
}

.terminal-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.terminal-actions button,
.terminal-actions a {
  min-height: 30px;
  padding: 7px 10px;
  border: 1px solid var(--rule);
  background: transparent;
  color: var(--phosphor);
  cursor: pointer;
  text-decoration: none;
}

.terminal-actions button:hover,
.terminal-actions button:focus-visible,
.terminal-actions a:hover,
.terminal-actions a:focus-visible {
  border-color: var(--acid);
  background: var(--acid);
  color: var(--void);
  outline: none;
}

pre {
  max-height: 420px;
  margin: 0;
  padding: clamp(18px, 3vw, 38px);
  overflow: auto;
  color: #cbd69a;
  font: 500 clamp(10px, 1.1vw, 13px)/1.8 var(--mono);
  tab-size: 2;
  white-space: pre-wrap;
}

.spectator {
  padding: 92px 0 72px;
}

.spectator-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 20px;
  color: var(--quiet);
  font-size: 10px;
  letter-spacing: 0.08em;
}

.spectator-head p {
  margin: 0;
}

.meme-rail {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  border: 1px solid var(--rule);
  background: var(--rule);
}

.meme-card {
  position: relative;
  min-width: 0;
  aspect-ratio: 1;
  overflow: hidden;
  background: var(--void-2);
}

.meme-card img {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: cover;
  filter: grayscale(0.35) brightness(0.75) contrast(1.08);
  transition: filter 180ms ease, transform 300ms ease;
}

.meme-card:hover img,
.meme-card:focus-visible img {
  filter: none;
  transform: scale(1.025);
}

.meme-card:focus-visible {
  outline: 2px solid var(--acid);
  outline-offset: -2px;
}

.meme-card span {
  position: absolute;
  right: 10px;
  bottom: 10px;
  padding: 5px 7px;
  background: var(--void);
  color: var(--acid);
  font-size: 8px;
  opacity: 0;
  transition: opacity 160ms ease;
}

.meme-card:hover span,
.meme-card:focus-visible span {
  opacity: 1;
}

.limits {
  padding: 28px 0 64px;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 24px;
  border-top: 1px solid var(--rule);
  color: var(--quiet);
  font-size: 9px;
  line-height: 1.8;
}

.limits p {
  margin: 0;
}

.fault {
  color: var(--fault);
}

.human-note {
  width: min(680px, 100%);
  margin: 0 0 68px auto;
  border-top: 1px solid var(--rule);
  color: var(--quiet);
  font: 420 13px/1.65 var(--sans);
}

.human-note summary {
  padding: 12px 0;
  color: var(--phosphor);
  cursor: pointer;
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.08em;
  list-style: none;
}

.human-note summary::-webkit-details-marker {
  display: none;
}

.human-note p {
  margin: 0;
  padding: 0 0 18px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

@keyframes node-boot {
  to {
    opacity: 1;
    transform: none;
  }
}

@media (max-width: 820px) {
  .shell {
    width: min(100% - 28px, 680px);
  }

  .machine-head {
    font-size: 8px;
  }

  .machine-head .head-mode {
    display: none;
  }

  .hero {
    min-height: auto;
    padding-top: 72px;
  }

  .hero-title {
    display: block;
  }

  .compression {
    margin-top: 20px;
    text-align: left;
  }

  .causal-bus {
    grid-template-columns: 1fr;
    gap: 34px;
  }

  .causal-bus::before,
  .causal-bus::after {
    top: 12%;
    bottom: 12%;
    left: 50%;
    width: 1px;
    height: auto;
    background: linear-gradient(transparent, var(--acid), transparent);
  }

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

  .node {
    min-height: 48px;
  }

  .button-port {
    width: min(480px, 100%);
    margin: auto;
  }

  .meme-rail {
    grid-template-columns: 1fr;
  }

  .meme-card {
    aspect-ratio: 16 / 10;
  }

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

@media (max-width: 480px) {
  .hero-title h1 {
    font-size: 52px;
  }

  .node-stack {
    grid-template-columns: 1fr;
  }

  .terminal-bar {
    align-items: flex-start;
    flex-direction: column;
  }

  pre {
    line-height: 1.65;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}