* {
  box-sizing: border-box;
}

html,
body {
  min-width: 280px;
  min-height: 100%;
}

body {
  display: grid;
  min-height: 100svh;
  margin: 0;
  place-items: stretch;
  color: var(--game-text);
  background: var(--game-bg);
  font-family: var(--game-font);
}

button,
output {
  font: inherit;
}

.runner-card {
  display: grid;
  grid-template-rows: auto auto 1fr auto;
  gap: 0.6rem;
  width: min(100%, 420px);
  min-height: 100svh;
  margin-inline: auto;
  padding: 0.9rem;
  background: var(--game-bg);
  border: 1px solid var(--game-divider);
  border-radius: calc(var(--game-radius) * 2);
  box-shadow: var(--game-shadow);
}

.game-header {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 0.75rem;
}

.eyebrow {
  margin: 0 0 0.12rem;
  color: var(--game-accent);
  font-family: var(--game-mono);
  font-size: 0.56rem;
  font-weight: 700;
  letter-spacing: 0.12em;
}

h1 {
  margin: 0;
  font-size: clamp(1.15rem, 5vw, 1.45rem);
  line-height: 1.1;
}

.reward-key {
  flex: 0 0 auto;
  padding: 0.35rem 0.5rem;
  color: var(--game-muted);
  background: var(--game-surface);
  border: 1px solid var(--game-divider);
  border-radius: var(--game-radius);
  font-family: var(--game-mono);
  font-size: 0.68rem;
  font-weight: 700;
}

.metrics {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  overflow: hidden;
  background: var(--game-divider);
  border: 1px solid var(--game-divider);
  border-radius: var(--game-radius);
}

.metrics > div {
  min-width: 0;
  padding: 0.38rem 0.45rem;
  background: var(--game-surface);
  text-align: center;
}

.metrics dt {
  overflow: hidden;
  color: var(--game-muted);
  font-size: 0.58rem;
  font-weight: 700;
  text-overflow: ellipsis;
  text-transform: uppercase;
  white-space: nowrap;
}

.metrics dd {
  margin: 0.08rem 0 0;
  font-family: var(--game-mono);
  font-size: 0.88rem;
  font-weight: 800;
  font-variant-numeric: tabular-nums;
}

.track {
  position: relative;
  align-self: stretch;
  width: 100%;
  height: clamp(142px, 43svh, 166px);
  min-height: 142px;
  padding: 0;
  overflow: hidden;
  color: var(--game-text);
  background:
    linear-gradient(var(--game-divider) 1px, transparent 1px),
    linear-gradient(90deg, var(--game-divider) 1px, transparent 1px), var(--game-surface);
  background-size: 24px 24px;
  border: 1px solid var(--game-divider);
  border-radius: var(--game-radius);
  cursor: pointer;
  touch-action: manipulation;
  contain: layout paint;
}

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

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

.ground {
  position: absolute;
  right: 0;
  bottom: 22px;
  left: 0;
  height: 2px;
  background: var(--game-text);
  opacity: 0.55;
}

.agent {
  position: absolute;
  bottom: 24px;
  left: 10%;
  z-index: 3;
  width: 24px;
  height: 30px;
  background: var(--game-accent);
  border: 2px solid var(--game-accent-strong);
  border-radius: var(--game-radius) var(--game-radius) 4px 4px;
  will-change: transform;
}

.agent::before {
  position: absolute;
  top: 6px;
  right: 4px;
  width: 4px;
  height: 4px;
  background: var(--game-on-accent);
  border-radius: 50%;
  content: '';
}

.agent::after {
  position: absolute;
  bottom: -7px;
  left: 2px;
  box-sizing: border-box;
  width: 16px;
  height: 7px;
  border-right: 4px solid var(--game-accent-strong);
  border-left: 4px solid var(--game-accent-strong);
  content: '';
}

.track[data-phase='over'] .agent {
  background: var(--game-danger);
  border-color: var(--game-danger);
}

.entities {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.entity {
  position: absolute;
  z-index: 2;
  display: grid;
  place-items: center;
  font-family: var(--game-mono);
  font-size: 0.66rem;
  font-weight: 800;
  line-height: 1;
  will-change: transform;
}

.obstacle {
  color: var(--game-danger);
  background: var(--game-surface-strong);
  border: 2px solid var(--game-danger);
  border-radius: var(--game-radius) var(--game-radius) 0 0;
}

.reward {
  color: var(--game-on-accent);
  background: var(--game-accent);
  border: 2px solid var(--game-accent-strong);
  border-radius: 50%;
  box-shadow: 0 0 0 3px var(--game-accent-soft);
}

.track-prompt {
  position: absolute;
  top: 50%;
  left: 50%;
  z-index: 4;
  max-width: calc(100% - 2rem);
  padding: 0.5rem 0.7rem;
  color: var(--game-text);
  background: var(--game-bg);
  border: 1px solid var(--game-divider);
  border-radius: var(--game-radius);
  box-shadow: var(--game-shadow);
  font-size: 0.72rem;
  font-weight: 750;
  text-align: center;
  transform: translate(-50%, -50%);
  transition: opacity 120ms ease;
}

.track[data-phase='running'] .track-prompt {
  opacity: 0;
}

.feedback {
  display: grid;
  gap: 0.18rem;
  align-content: start;
}

.status,
.help {
  margin: 0;
  text-align: center;
}

.status {
  min-height: 2.5em;
  color: var(--game-text);
  font-size: 0.7rem;
  font-weight: 650;
  line-height: 1.25;
}

.help {
  color: var(--game-muted);
  font-size: 0.6rem;
  line-height: 1.35;
}

html[data-embed='true'] body {
  background: transparent;
}

html[data-embed='true'] .runner-card {
  min-height: 100%;
  border: 0;
  border-radius: 0;
  box-shadow: none;
}

@media (max-width: 320px) {
  .runner-card {
    padding-inline: 0.7rem;
  }

  .game-header {
    gap: 0.4rem;
  }

  .reward-key {
    padding-inline: 0.35rem;
  }
}

@media (max-height: 360px) {
  .runner-card {
    gap: 0.45rem;
    padding-block: 0.65rem;
  }

  .track {
    height: 142px;
  }

  .help {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip-path: inset(50%);
    white-space: nowrap;
    border: 0;
  }
}

@media (prefers-reduced-motion: no-preference) {
  .track[data-phase='running'] .agent::after {
    animation: stride 180ms steps(2, end) infinite;
  }

  .reward {
    animation: reward-pulse 900ms ease-in-out infinite alternate;
  }

  @keyframes stride {
    to {
      transform: skewX(-18deg);
    }
  }

  @keyframes reward-pulse {
    to {
      box-shadow: 0 0 0 6px var(--game-accent-soft);
    }
  }
}