* {
  box-sizing: border-box;
}

:root {
  --net-wire: color-mix(in srgb, var(--game-muted) 68%, var(--game-divider));
  --net-live: var(--game-accent);
  --net-error: #c94f59;
  --net-cell: color-mix(in srgb, var(--game-surface) 86%, var(--game-bg));
  --net-cell-live: color-mix(in srgb, var(--game-accent-soft) 48%, var(--game-surface));
}

html[data-theme='dark'] {
  --net-error: #ff9a9f;
  --net-cell-live: color-mix(in srgb, var(--game-accent-soft) 30%, var(--game-surface));
}

html {
  min-width: 280px;
  background: var(--game-bg);
}

body {
  display: grid;
  min-width: 280px;
  min-height: 100svh;
  margin: 0;
  padding: 0.375rem;
  place-items: center;
  color: var(--game-text);
  background:
    radial-gradient(
      circle at 88% 8%,
      color-mix(in srgb, var(--game-accent-soft) 42%, transparent),
      transparent 34%
    ),
    var(--game-bg);
  font-family: var(--game-font);
}

button,
output {
  font: inherit;
}

.game {
  display: grid;
  width: min(100%, 430px);
  min-height: min(calc(100svh - 0.75rem), 528px);
  padding: clamp(0.58rem, 3vw, 0.82rem);
  align-content: center;
  gap: clamp(0.38rem, 1.6vh, 0.52rem);
  overflow: hidden;
  background: var(--game-bg);
  border: 1px solid var(--game-divider);
  border-radius: var(--game-radius);
  box-shadow: var(--game-shadow);
}

.game-header {
  display: flex;
  min-width: 0;
  align-items: center;
  justify-content: space-between;
  gap: 0.55rem;
}

.eyebrow {
  margin: 0 0 0.12rem;
  color: var(--game-accent);
  font-family: var(--game-mono);
  font-size: 0.56rem;
  font-weight: 750;
  letter-spacing: 0.12em;
}

h1 {
  margin: 0;
  font-size: clamp(1.18rem, 5.6vw, 1.48rem);
  font-weight: 650;
  letter-spacing: -0.025em;
  line-height: 1.05;
}

.node-key {
  display: flex;
  min-width: 0;
  margin: 0;
  gap: 0.18rem;
}

.node-key span {
  display: grid;
  min-width: 1.55rem;
  min-height: 1.55rem;
  padding: 0 0.18rem;
  place-items: center;
  color: var(--game-accent);
  background: var(--game-surface);
  border: 1px solid var(--game-divider);
  border-radius: 999px;
  font-family: var(--game-mono);
  font-size: 0.48rem;
  font-weight: 800;
}

.metrics {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin: 0;
  gap: 0.32rem;
}

.metrics div {
  min-width: 0;
  padding: 0.32rem 0.4rem;
  text-align: center;
  background: var(--game-surface);
  border: 1px solid var(--game-divider);
  border-radius: calc(var(--game-radius) * 0.75);
}

.metrics dt {
  overflow: hidden;
  margin: 0 0 0.08rem;
  color: var(--game-muted);
  font-size: 0.62rem;
  line-height: 1.1;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.metrics dd {
  margin: 0;
  font-family: var(--game-mono);
  font-size: 0.79rem;
  font-weight: 750;
  line-height: 1.15;
}

.board-section {
  display: grid;
  min-width: 0;
  place-items: center;
}

.board {
  display: grid;
  width: min(100%, 296px);
  aspect-ratio: 1;
  padding: 0.24rem;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.2rem;
  background: color-mix(in srgb, var(--game-divider) 55%, var(--game-surface));
  border: 1px solid var(--game-divider);
  border-radius: calc(var(--game-radius) * 0.9);
  box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--game-bg) 52%, transparent);
}

.tile {
  position: relative;
  display: block;
  min-width: 44px;
  min-height: 44px;
  margin: 0;
  padding: 0;
  overflow: hidden;
  touch-action: manipulation;
  color: var(--game-text);
  background: var(--net-cell);
  border: 1px solid color-mix(in srgb, var(--game-divider) 82%, transparent);
  border-radius: calc(var(--game-radius) * 0.55);
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}

.tile::after {
  position: absolute;
  inset: 0;
  border: 2px solid transparent;
  border-radius: inherit;
  content: '';
  pointer-events: none;
  transition: border-color 120ms ease;
}

.tile:hover::after {
  border-color: color-mix(in srgb, var(--game-accent) 42%, transparent);
}

.tile:focus-visible {
  z-index: 5;
  outline: 3px solid var(--game-accent);
  outline-offset: 1px;
}

.tile.is-connected {
  background: var(--net-cell-live);
}

.tile[data-role='coordinator'] {
  background: color-mix(in srgb, var(--game-accent-soft) 70%, var(--game-surface));
}

.tile[aria-disabled='true'] {
  cursor: default;
}

.pipe {
  position: absolute;
  z-index: 1;
  display: block;
  background: var(--net-wire);
  pointer-events: none;
  transition: background-color 150ms ease;
}

.pipe-n,
.pipe-s {
  left: calc(50% - 0.16rem);
  width: 0.32rem;
  height: calc(50% + 0.17rem);
}

.pipe-e,
.pipe-w {
  top: calc(50% - 0.16rem);
  width: calc(50% + 0.17rem);
  height: 0.32rem;
}

.pipe-n {
  top: 0;
}

.pipe-e {
  right: 0;
}

.pipe-s {
  bottom: 0;
}

.pipe-w {
  left: 0;
}

.pipe.is-linked {
  background: color-mix(in srgb, var(--net-wire) 62%, var(--net-live));
}

.is-connected .pipe.is-linked {
  background: var(--net-live);
}

.pipe.is-loose {
  background: var(--net-error);
}

.hub {
  position: absolute;
  z-index: 2;
  top: 50%;
  left: 50%;
  width: 0.72rem;
  height: 0.72rem;
  background: var(--net-wire);
  border: 2px solid var(--net-cell);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  transition: background-color 150ms ease;
  pointer-events: none;
}

.is-connected .hub {
  background: var(--net-live);
}

.node-badge {
  position: absolute;
  z-index: 3;
  top: 50%;
  left: 50%;
  display: grid;
  min-width: 1.38rem;
  min-height: 1.38rem;
  padding: 0.08rem;
  place-items: center;
  color: var(--game-text);
  background: var(--game-surface);
  border: 2px solid var(--net-wire);
  border-radius: 999px;
  font-family: var(--game-mono);
  font-size: clamp(0.44rem, 2vw, 0.56rem);
  font-weight: 850;
  line-height: 1;
  transform: translate(-50%, -50%);
  pointer-events: none;
}

.is-connected .node-badge {
  color: var(--game-accent);
  border-color: var(--net-live);
}

.request-pulse {
  --pulse-start-left: 50%;
  --pulse-start-top: 50%;
  --pulse-end-left: 50%;
  --pulse-end-top: 50%;
  position: absolute;
  z-index: 4;
  top: var(--pulse-start-top);
  left: var(--pulse-start-left);
  width: 0.38rem;
  height: 0.38rem;
  background: var(--game-bg);
  border: 1px solid var(--game-accent);
  border-radius: 50%;
  opacity: 0;
  transform: translate(-50%, -50%);
  animation: request-flow 1.35s ease-in-out var(--pulse-delay, 0s) infinite;
  pointer-events: none;
}

.pipe-e .request-pulse {
  --pulse-start-left: 0%;
  --pulse-end-left: 100%;
}

.pipe-w .request-pulse {
  --pulse-start-left: 100%;
  --pulse-end-left: 0%;
}

.pipe-n .request-pulse {
  --pulse-start-top: 100%;
  --pulse-end-top: 0%;
}

.pipe-s .request-pulse {
  --pulse-start-top: 0%;
  --pulse-end-top: 100%;
}

.pipe-e .request-pulse.is-inbound {
  --pulse-start-left: 100%;
  --pulse-end-left: 0%;
}

.pipe-w .request-pulse.is-inbound {
  --pulse-start-left: 0%;
  --pulse-end-left: 100%;
}

.pipe-n .request-pulse.is-inbound {
  --pulse-start-top: 0%;
  --pulse-end-top: 100%;
}

.pipe-s .request-pulse.is-inbound {
  --pulse-start-top: 100%;
  --pulse-end-top: 0%;
}

.board[data-paused='true'] .request-pulse {
  animation-play-state: paused;
}

@keyframes request-flow {
  0%,
  12% {
    top: var(--pulse-start-top);
    left: var(--pulse-start-left);
    opacity: 0;
  }

  24% {
    opacity: 1;
  }

  66% {
    top: var(--pulse-end-top);
    left: var(--pulse-end-left);
    opacity: 1;
  }

  78%,
  100% {
    top: var(--pulse-end-top);
    left: var(--pulse-end-left);
    opacity: 0;
  }
}

.controls {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 0.4rem;
}

.controls button {
  min-width: 0;
  min-height: 44px;
  padding: 0.48rem 0.65rem;
  color: var(--game-text);
  background: var(--game-surface);
  border: 1px solid var(--game-divider);
  border-radius: calc(var(--game-radius) * 0.75);
  font-weight: 700;
  cursor: pointer;
  touch-action: manipulation;
}

.controls button:first-child {
  color: var(--game-bg);
  background: var(--game-accent);
  border-color: var(--game-accent);
}

.controls button:hover {
  border-color: var(--game-accent);
}

.controls button:focus-visible {
  outline: 3px solid var(--game-accent);
  outline-offset: 2px;
}

.status,
.hint {
  margin: 0;
  overflow-wrap: anywhere;
  text-align: center;
}

.status {
  min-height: 1.5em;
  color: var(--game-text);
  font-size: 0.72rem;
  font-weight: 650;
  line-height: 1.35;
}

.status.is-complete {
  color: var(--game-accent);
}

.hint {
  color: var(--game-muted);
  font-size: 0.62rem;
  line-height: 1.25;
}

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

@media (max-width: 330px) {
  .game {
    padding: 0.52rem;
    gap: 0.34rem;
  }

  .node-key {
    gap: 0.1rem;
  }

  .node-key span {
    min-width: 1.38rem;
    min-height: 1.38rem;
    padding: 0 0.12rem;
    font-size: 0.43rem;
  }

  .board {
    gap: 0.16rem;
    padding: 0.2rem;
  }
}

@media (max-height: 540px) {
  .game {
    min-height: calc(100svh - 0.75rem);
    padding-block: 0.45rem;
    gap: 0.3rem;
  }

  .board {
    width: min(100%, 252px, 48svh);
  }

  .hint {
    display: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .request-pulse {
    display: none;
  }

  .pipe,
  .hub,
  .tile::after {
    transition: none;
  }
}

@media (forced-colors: active) {
  .tile,
  .node-badge,
  .controls button {
    border-color: ButtonText;
  }

  .pipe,
  .hub {
    background: ButtonText;
  }

  .tile:focus-visible {
    outline-color: Highlight;
  }
}