:root {
  color-scheme: light dark;
  --bg: #c7c0ad;
  --panel: #d7d0bd;
  --panel-border: #8b846f;
  --panel-edge: #f0ebdb;
  --panel-shadow: #726b58;
  --bg-top: #b8b09c;
  --text: #1f241d;
  --muted: #54604d;
  --scoreboard-bg: #bbb39f;
  --score-screen-bezel: #505a4a;
  --score-screen-bezel-shadow: #171d16;
  --score-screen: #132013;
  --score-screen-line: rgba(255, 255, 255, 0.05);
  --score-screen-label: #8fd39f;
  --canvas-frame: #263127;
  --canvas-bezel: #535b4a;
  --canvas-bezel-shadow: #161b14;
  --canvas-frame-outline: rgba(114, 107, 88, 0.68);
  --canvas-board: #132013;
  --canvas-grid: #1f311f;
  --canvas-wall: #8e948c;
  --canvas-food: #ff7f52;
  --canvas-snake: #6ef0a3;
  --canvas-snake-head: #a3ffd6;
  --control-surface: #6c745d;
  --control-surface-dark: #454c3a;
  --control-border: #2d3328;
  --overlay: rgba(8, 17, 10, 0.7);
  --screen-glow: rgba(110, 240, 163, 0.14);
  --shadow: 0 1.5rem 3rem rgba(42, 35, 22, 0.2);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121412;
    --panel: #2a2f28;
    --panel-border: #4f5649;
    --panel-edge: #70786b;
    --panel-shadow: #0c0e0b;
    --bg-top: #1a1d1a;
    --text: #ebf5e7;
    --muted: #9eb09b;
    --scoreboard-bg: #1f241e;
    --score-screen-bezel: #3f4838;
    --score-screen-bezel-shadow: #0d110a;
    --score-screen: #0b130c;
    --score-screen-line: rgba(255, 255, 255, 0.04);
    --score-screen-label: #7fe3a0;
    --canvas-frame: #20261d;
    --canvas-bezel: #3f4838;
    --canvas-bezel-shadow: #0d110a;
    --canvas-frame-outline: rgba(12, 14, 11, 0.72);
    --canvas-board: #0b130c;
    --canvas-grid: #142117;
    --canvas-wall: #9aa198;
    --canvas-food: #ff7650;
    --canvas-snake: #42dd84;
    --canvas-snake-head: #85ffc1;
    --control-surface: #5a624f;
    --control-surface-dark: #394133;
    --control-border: #171c14;
    --overlay: rgba(4, 8, 5, 0.76);
    --screen-glow: rgba(66, 221, 132, 0.12);
    --shadow: 0 1.625rem 3.5rem rgba(0, 0, 0, 0.45);
  }
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  color: var(--text);
  font-family: SFMono-Regular, "Courier New", monospace;
  background:
    radial-gradient(circle at top, rgba(255, 255, 255, 0.18), transparent 34%),
    linear-gradient(180deg, var(--bg-top), var(--bg));
}

button,
canvas {
  font: inherit;
}

button,
canvas {
  touch-action: manipulation;
}

.app-shell {
  width: min(47.5rem, calc(100vw - 2rem));
  margin: 0 auto;
  min-height: 100vh;
  min-height: 100dvh;
  display: grid;
  align-items: center;
  padding: 2.5rem 0;
}

.game-panel {
  display: grid;
  gap: 1rem;
  padding: 1.5rem 1.5rem 1.25rem;
  border: 0.1875rem solid var(--panel-border);
  border-radius: 0.75rem;
  background: var(--panel);
  box-shadow:
    inset 0.125rem 0.125rem 0 var(--panel-edge),
    inset -0.1875rem -0.1875rem 0 var(--panel-shadow),
    var(--shadow);
}

.panel-top,
.panel-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.panel-top {
  gap: 0.75rem;
}

.scoreboard {
  position: relative;
  display: grid;
  gap: 0.25rem;
  min-width: 7.25rem;
  padding: 0.5rem 0.75rem 0.625rem;
  border: 0.125rem solid var(--panel-shadow);
  background: var(--scoreboard-bg);
  box-shadow:
    inset 0.0625rem 0.0625rem 0 var(--panel-edge),
    inset -0.0625rem -0.0625rem 0 rgba(0, 0, 0, 0.16);
  overflow: hidden;
}

.scoreboard::before {
  content: "";
  position: absolute;
  inset: 0.375rem;
  border: 0.125rem solid var(--score-screen-bezel-shadow);
  box-shadow:
    inset 0 0 0 0.1875rem var(--score-screen-bezel),
    inset 0 0 0 0.375rem var(--score-screen-bezel-shadow);
  background: var(--score-screen);
}

.scoreboard::after {
  content: "";
  position: absolute;
  inset: 0.75rem;
  background: repeating-linear-gradient(
    180deg,
    var(--score-screen-line) 0,
    var(--score-screen-line) 0.0625rem,
    transparent 0.0625rem,
    transparent 0.25rem
  );
  opacity: 0.3;
  pointer-events: none;
}

.score-label,
.panel-footer,
#status {
  color: var(--muted);
}

.desktop-hint {
  color: var(--muted);
}

.score-label,
.desktop-hint,
#status {
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-size: 0.84rem;
}

.score-label,
.scoreboard strong {
  position: relative;
  z-index: 1;
}

.score-label {
  padding-left: 0.25rem;
  color: var(--score-screen-label);
  text-shadow: 0 0 0.5rem var(--screen-glow);
}

.scoreboard strong {
  padding-left: 0.25rem;
  font-size: 1.7rem;
  color: var(--canvas-snake-head);
  text-shadow: 0 0 0.625rem var(--screen-glow);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.06em;
}

.controls {
  display: flex;
  gap: 0.5rem;
  padding: 0.3125rem;
  border: 0.125rem solid var(--panel-shadow);
  border-radius: 0.625rem;
  background: var(--scoreboard-bg);
  box-shadow:
    inset 0.0625rem 0.0625rem 0 var(--panel-edge),
    inset -0.0625rem -0.0625rem 0 rgba(0, 0, 0, 0.18);
}

.controls button {
  border: 0.125rem solid var(--control-border);
  border-radius: 0.5625rem;
  width: 2.625rem;
  height: 2.625rem;
  padding: 0;
  color: #fff;
  background: linear-gradient(180deg, var(--control-surface), var(--control-surface-dark));
  box-shadow:
    inset 0.0625rem 0.0625rem 0 rgba(255, 255, 255, 0.18),
    inset -0.125rem -0.125rem 0 rgba(0, 0, 0, 0.26);
  cursor: pointer;
  transition: box-shadow 120ms ease, background 120ms ease, color 120ms ease;
}

.icon-button {
  width: 2.625rem;
  height: 2.625rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  font-size: 0;
  line-height: 0;
  text-align: center;
  appearance: none;
  -webkit-appearance: none;
}

.icon-button svg {
  width: 1.125rem;
  height: 1.125rem;
  display: block;
  flex: 0 0 auto;
  margin: 0 auto;
}

.controls button:hover {
  background: linear-gradient(180deg, var(--control-surface), var(--control-surface-dark));
}

.controls button:active {
  background: linear-gradient(180deg, var(--control-surface-dark), var(--control-surface));
  box-shadow:
    inset 0.125rem 0.125rem 0 rgba(0, 0, 0, 0.26),
    inset -0.0625rem -0.0625rem 0 rgba(255, 255, 255, 0.08);
}

.controls button.is-pressed,
.controls button[aria-pressed="true"] {
  background: linear-gradient(180deg, var(--control-surface-dark), var(--control-surface));
  box-shadow:
    inset 0.125rem 0.125rem 0 rgba(0, 0, 0, 0.26),
    inset -0.0625rem -0.0625rem 0 rgba(255, 255, 255, 0.08);
}

.controls button:focus-visible,
.dpad-button:focus-visible {
  outline: 0.125rem solid var(--canvas-snake-head);
  outline-offset: 0.125rem;
}

.touch-controls {
  display: none;
}

.canvas-frame {
  position: relative;
  overflow: hidden;
  padding: 1.125rem;
  border: 0.1875rem solid var(--canvas-bezel-shadow);
  box-shadow:
    inset 0 0 0 0.25rem var(--canvas-bezel),
    inset 0 0 0 0.5rem var(--canvas-bezel-shadow),
    0 0 0 0.125rem var(--canvas-frame-outline);
  background: var(--canvas-frame);
}

#board,
.overlay {
  position: relative;
  z-index: 1;
}

#board {
  box-shadow:
    inset 0 0 2.25rem rgba(0, 0, 0, 0.22),
    0 0 1.75rem var(--screen-glow);
}

.canvas-frame::before {
  content: "";
  position: absolute;
  inset: 1.125rem;
  z-index: 2;
  pointer-events: none;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.05), transparent 18%, transparent 82%, rgba(0, 0, 0, 0.12)),
    radial-gradient(circle at center, transparent 56%, rgba(0, 0, 0, 0.22));
}

.canvas-frame::after {
  content: "";
  position: absolute;
  inset: 1.125rem;
  z-index: 3;
  pointer-events: none;
  opacity: 0.2;
  background: repeating-linear-gradient(
    180deg,
    rgba(255, 255, 255, 0.05) 0,
    rgba(255, 255, 255, 0.05) 0.0625rem,
    transparent 0.0625rem,
    transparent 0.25rem
  );
}

#board {
  display: block;
  width: auto;
  max-width: 100%;
  height: auto;
  margin: 0 auto;
}

.dpad {
  display: grid;
  grid-template-columns: repeat(3, minmax(4.5rem, 5.25rem));
  grid-template-rows: repeat(3, minmax(4.5rem, 5.25rem));
  gap: 0;
  justify-content: center;
  padding: 0.25rem;
  border: 0.125rem solid var(--panel-shadow);
  border-radius: 0.875rem;
  background: var(--scoreboard-bg);
  box-shadow:
    inset 0.0625rem 0.0625rem 0 var(--panel-edge),
    inset -0.0625rem -0.0625rem 0 rgba(0, 0, 0, 0.18);
}

.dpad-button {
  position: relative;
  z-index: 1;
  border: 0.125rem solid var(--control-border);
  color: #fff;
  font-size: 1.7rem;
  font-weight: 700;
  background: linear-gradient(180deg, var(--control-surface), var(--control-surface-dark));
  box-shadow:
    inset 0.0625rem 0.0625rem 0 rgba(255, 255, 255, 0.18),
    inset -0.125rem -0.125rem 0 rgba(0, 0, 0, 0.26);
  -webkit-tap-highlight-color: transparent;
  touch-action: none;
  user-select: none;
}

.dpad-core {
  grid-column: 2;
  grid-row: 2;
  border: 0.125rem solid var(--control-border);
  background: linear-gradient(180deg, var(--control-surface-dark), var(--control-surface));
  box-shadow:
    inset 0.125rem 0.125rem 0 rgba(0, 0, 0, 0.26),
    inset -0.0625rem -0.0625rem 0 rgba(255, 255, 255, 0.08);
}

.dpad-button:active {
  background: linear-gradient(180deg, var(--control-surface-dark), var(--control-surface));
  box-shadow:
    inset 0.125rem 0.125rem 0 rgba(0, 0, 0, 0.26),
    inset -0.0625rem -0.0625rem 0 rgba(255, 255, 255, 0.08);
}

.dpad-button.is-pressed {
  background: linear-gradient(180deg, var(--control-surface-dark), var(--control-surface));
  box-shadow:
    inset 0.125rem 0.125rem 0 rgba(0, 0, 0, 0.26),
    inset -0.0625rem -0.0625rem 0 rgba(255, 255, 255, 0.08);
}

.dpad-button.up {
  grid-column: 2;
  grid-row: 1;
  border-radius: 1.125rem 1.125rem 0 0;
}

.dpad-button.left {
  grid-column: 1;
  grid-row: 2;
  border-radius: 1.125rem 0 0 1.125rem;
}

.dpad-button.right {
  grid-column: 3;
  grid-row: 2;
  border-radius: 0 1.125rem 1.125rem 0;
}

.dpad-button.down {
  grid-column: 2;
  grid-row: 3;
  border-radius: 0 0 1.125rem 1.125rem;
}

.overlay {
  position: absolute;
  inset: 1.125rem;
  z-index: 4;
  display: grid;
  place-items: center;
  padding: 1.5rem;
  color: var(--canvas-snake-head);
  font-size: clamp(1.2rem, 2vw, 1.6rem);
  font-weight: 600;
  text-align: center;
  background: var(--overlay);
  text-shadow: 0 0 0.875rem var(--screen-glow);
}

.overlay-line {
  display: block;
}

.overlay-shortcuts {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.625rem;
  margin-top: 0.75rem;
  font-size: 0.92em;
}

.overlay-or,
.overlay-action {
  color: var(--canvas-wall);
}

.keycap {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 2.9em;
  padding: 0.24em 0.62em;
  border: 0.125rem solid var(--canvas-snake-head);
  border-radius: 0.48em;
  color: #f6fff7;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.1), rgba(0, 0, 0, 0.24));
  box-shadow:
    inset 0.0625rem 0.0625rem 0 rgba(255, 255, 255, 0.12),
    inset -0.0625rem -0.0625rem 0 rgba(0, 0, 0, 0.28);
  text-shadow: none;
}

.keycap-space {
  min-width: 4.8em;
}

.overlay.hidden {
  display: none;
}

@media (max-width: 47.5rem) {
  .app-shell {
    min-height: 100dvh;
    align-items: start;
    padding: 0.75rem 0 1rem;
  }

  .game-panel {
    gap: 0.875rem;
    padding: 0.875rem 0.875rem 0.75rem;
  }

  .panel-top {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    flex-wrap: nowrap;
    gap: 0.375rem;
  }

  .scoreboard {
    display: flex;
    align-items: baseline;
    gap: 0.3125rem;
    min-width: auto;
    padding: 0.3025rem 0.529375rem 0.378125rem;
  }

  .scoreboard::before {
    inset: 0.25rem;
  }

  .scoreboard::after {
    inset: 0.5rem;
  }

  .score-label,
  .scoreboard strong {
    padding-left: 0.125rem;
  }

  .score-label {
    font-size: 0.64rem;
  }

  .scoreboard strong {
    font-size: 0.8311rem;
    min-width: 5ch;
    text-align: right;
  }

  .panel-footer {
    display: none;
  }

  .controls {
    width: auto;
    flex: 0 0 auto;
    gap: 0.1875rem;
    padding: 0.125rem;
  }

  .controls button {
    flex: 0 0 auto;
  }

  .controls .icon-button {
    max-width: 2.75rem;
    width: 2.125rem;
    height: 2.125rem;
  }

  .controls .icon-button svg {
    width: 0.9375rem;
    height: 0.9375rem;
  }

  .touch-controls {
    display: grid;
    gap: 0.875rem;
    justify-items: center;
  }

  .desktop-hint {
    display: none;
  }

  .dpad {
    --dpad-size: 17.9685rem;
    --dpad-thickness: 5.4934rem;
    --dpad-arm-size: calc((var(--dpad-size) - var(--dpad-thickness)) / 2);

    position: relative;
    display: block;
    width: var(--dpad-size);
    height: var(--dpad-size);
    padding: 0;
    border: 0;
    border-radius: 0;
    background: transparent;
    box-shadow: none;
  }

  .dpad-button {
    position: absolute;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.05rem;
    line-height: 1;
  }

  .dpad-core {
    display: none;
  }

  .dpad-button.up {
    top: 0;
    left: calc((var(--dpad-size) - var(--dpad-thickness)) / 2);
    width: var(--dpad-thickness);
    height: var(--dpad-arm-size);
    border-radius: 1.125rem 1.125rem 0.5rem 0.5rem;
  }

  .dpad-button.left {
    top: calc((var(--dpad-size) - var(--dpad-thickness)) / 2);
    left: 0;
    width: var(--dpad-arm-size);
    height: var(--dpad-thickness);
    border-radius: 1.125rem 0.5rem 0.5rem 1.125rem;
  }

  .dpad-button.right {
    top: calc((var(--dpad-size) - var(--dpad-thickness)) / 2);
    right: 0;
    width: var(--dpad-arm-size);
    height: var(--dpad-thickness);
    border-radius: 0.5rem 1.125rem 1.125rem 0.5rem;
  }

  .dpad-button.down {
    bottom: 0;
    left: calc((var(--dpad-size) - var(--dpad-thickness)) / 2);
    width: var(--dpad-thickness);
    height: var(--dpad-arm-size);
    border-radius: 0.5rem 0.5rem 1.125rem 1.125rem;
  }
}

@media (max-width: 47.5rem) and (max-height: 47.5rem) {
  .game-panel {
    gap: 0.625rem;
    padding: 0.75rem 0.75rem 0.625rem;
  }

  .scoreboard {
    gap: 0.3125rem;
    padding: 0.3025rem 0.529375rem 0.378125rem;
  }

  .score-label {
    font-size: 0.6rem;
    padding-left: 0.09375rem;
  }

  .scoreboard strong {
    font-size: 0.7144rem;
    padding-left: 0.09375rem;
  }

  .controls {
    gap: 0.25rem;
    padding: 0.125rem;
  }

  .controls button,
  .controls .icon-button {
    width: 1.875rem;
    height: 1.875rem;
  }

  .controls .icon-button svg {
    width: 0.8125rem;
    height: 0.8125rem;
  }

  .canvas-frame {
    padding: 0.875rem;
  }

  .canvas-frame::before,
  .canvas-frame::after,
  .overlay {
    inset: 0.875rem;
  }

  .overlay-shortcuts {
    gap: 0.5rem;
    margin-top: 0.625rem;
  }

  .touch-controls {
    gap: 0.625rem;
  }

  .dpad {
    --dpad-size: 16.3048rem;
    --dpad-thickness: 4.9913rem;
  }

  .dpad-button {
    font-size: 1.85rem;
  }
}