:root {
  color-scheme: dark;
  --page: #10130f;
  --ink: #f6f2e8;
  --muted: #b8b4a9;
  --line: #33392d;
  --panel: #171b14;
  --panel-strong: #20271c;
  --snake: #72d364;
  --snake-dark: #3a914a;
  --food: #ff654f;
  --gold: #f0c451;
  --teal: #46c2b1;
  --shadow: rgba(0, 0, 0, 0.35);
}

* {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
  background:
    linear-gradient(90deg, rgba(255, 255, 255, 0.025) 1px, transparent 1px),
    linear-gradient(0deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px),
    var(--page);
  background-size: 36px 36px;
  color: var(--ink);
}

button,
input {
  font: inherit;
}

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

.app-shell {
  min-height: 100svh;
  display: grid;
  grid-template-columns: minmax(320px, 1fr) minmax(260px, 320px);
  gap: 24px;
  align-items: center;
  padding: 24px;
}

.board-section,
.control-panel {
  min-width: 0;
}

.board-section {
  width: min(760px, 100%);
  justify-self: end;
}

.top-strip {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 14px;
}

h1 {
  margin: 0;
  font-size: clamp(2.2rem, 8vw, 5.6rem);
  line-height: 0.95;
  letter-spacing: 0;
}

.status-pill {
  min-width: 92px;
  padding: 8px 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(240, 196, 81, 0.11);
  color: var(--gold);
  text-align: center;
  font-weight: 800;
}

.board-wrap {
  position: relative;
  width: min(76vh, 100%);
  max-width: 720px;
  aspect-ratio: 1;
  border: 1px solid #3c4635;
  border-radius: 8px;
  background: #151c14;
  box-shadow: 0 24px 80px var(--shadow);
  overflow: hidden;
}

canvas {
  display: block;
  width: 100%;
  height: 100%;
  touch-action: none;
}

.overlay {
  position: absolute;
  inset: 0;
  display: grid;
  place-content: center;
  gap: 16px;
  background: rgba(16, 19, 15, 0.68);
  opacity: 0;
  pointer-events: none;
  transition: opacity 160ms ease;
}

.overlay.is-visible {
  opacity: 1;
  pointer-events: auto;
}

.overlay-title {
  font-size: clamp(2rem, 8vw, 4rem);
  font-weight: 900;
  line-height: 1;
  text-align: center;
}

.primary-action,
.control-button,
.icon-button,
.segment {
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--ink);
  background: var(--panel-strong);
  cursor: pointer;
  transition:
    transform 120ms ease,
    border-color 120ms ease,
    background 120ms ease;
}

.primary-action:hover,
.control-button:hover,
.icon-button:hover,
.segment:hover {
  border-color: var(--teal);
  transform: translateY(-1px);
}

.primary-action:focus-visible,
.control-button:focus-visible,
.icon-button:focus-visible,
.segment:focus-visible,
input:focus-visible {
  outline: 3px solid rgba(70, 194, 177, 0.44);
  outline-offset: 3px;
}

.primary-action {
  min-height: 48px;
  min-width: 134px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 0 18px;
  background: var(--gold);
  border-color: #d9a92e;
  color: #1b1609;
  font-weight: 900;
}

.control-panel {
  display: grid;
  gap: 18px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(23, 27, 20, 0.86);
}

.score-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
}

.score-grid > div {
  min-width: 0;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #11150f;
}

.metric-label,
.setting-label {
  display: block;
  margin-bottom: 8px;
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

.score-grid strong {
  display: block;
  font-size: clamp(1.4rem, 4vw, 2.2rem);
  line-height: 1;
}

.button-row {
  display: grid;
  grid-template-columns: 1fr 1fr 48px;
  gap: 10px;
}

.control-button,
.icon-button {
  min-height: 48px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 0 12px;
  font-weight: 800;
}

.icon-button {
  width: 48px;
  padding: 0;
  font-size: 1.25rem;
}

.setting {
  display: block;
}

.segmented {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.segment {
  min-height: 42px;
  padding: 0 10px;
  font-weight: 800;
}

.segment.is-active {
  background: rgba(70, 194, 177, 0.22);
  border-color: var(--teal);
  color: #dffcf7;
}

input[type="range"] {
  width: 100%;
  accent-color: var(--gold);
}

.d-pad {
  width: 160px;
  justify-self: center;
  display: grid;
  grid-template-columns: repeat(3, 48px);
  grid-template-rows: repeat(3, 48px);
  gap: 8px;
}

.d-pad .up {
  grid-column: 2;
}

.d-pad .left {
  grid-column: 1;
  grid-row: 2;
}

.d-pad .down {
  grid-column: 2;
  grid-row: 2;
}

.d-pad .right {
  grid-column: 3;
  grid-row: 2;
}

@media (max-width: 900px) {
  .app-shell {
    grid-template-columns: 1fr;
    align-items: start;
    padding: 16px;
  }

  .board-section {
    width: 100%;
    justify-self: center;
  }

  .board-wrap {
    width: min(100%, 68svh);
    margin: 0 auto;
  }

  .control-panel {
    width: min(100%, 720px);
    justify-self: center;
    grid-template-columns: 1fr;
  }
}

@media (max-width: 520px) {
  .app-shell {
    gap: 14px;
    padding: 12px;
  }

  .top-strip {
    margin-bottom: 10px;
  }

  .score-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .score-grid > div {
    padding: 10px 8px;
  }

  .button-row {
    grid-template-columns: 1fr 1fr 48px;
  }
}