:root {
  color-scheme: light;
  --bg: #eef3ef;
  --panel: #ffffff;
  --panel-border: #b5c4b8;
  --text-main: #132b1d;
  --text-soft: #355243;
  --accent: #0e55c8;
  --accent-deep: #083c90;
  --accent-text: #ffffff;
  --focus-ring: #ffbf47;
  --hud-bg: #f7faf7;
  --board-bg: #dbe6d7;
  --board-tile-a: #edf4e9;
  --board-tile-b: #c7d7c0;
  --board-border: #667f6b;
  --player: #1458c8;
  --player-dark: #0b357d;
  --enemy: #4b5e53;
  --enemy-dark: #263029;
  --food: #b73a24;
  --food-leaf: #2e7a3a;
  --track: #d2ddd2;
  --shadow: 0 12px 30px rgba(21, 38, 28, 0.08);
}

body.high-contrast {
  --bg: #f5f5f5;
  --panel: #ffffff;
  --panel-border: #111111;
  --text-main: #000000;
  --text-soft: #111111;
  --accent: #0000cc;
  --accent-deep: #000066;
  --accent-text: #ffffff;
  --focus-ring: #ffbf00;
  --hud-bg: #ffffff;
  --board-bg: #ffffff;
  --board-tile-a: #ffffff;
  --board-tile-b: #d9d9d9;
  --board-border: #111111;
  --player: #003cff;
  --player-dark: #001c80;
  --enemy: #333333;
  --enemy-dark: #000000;
  --food: #aa0000;
  --food-leaf: #006b00;
  --track: #dddddd;
  --shadow: none;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Trebuchet MS", "Segoe UI", sans-serif;
  color: var(--text-main);
  background: var(--bg);
}

button,
canvas,
a {
  touch-action: manipulation;
}

.board-wrap,
.game-board {
  touch-action: none;
}

.skip-link,
.sr-only {
  position: absolute;
}

.skip-link {
  top: 16px;
  left: 16px;
  z-index: 10;
  padding: 12px 16px;
  border-radius: 12px;
  color: #ffffff;
  background: #111111;
  transform: translateY(-150%);
}

.skip-link:focus-visible {
  transform: translateY(0);
}

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

.page {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 12px;
}

.game-card {
  width: min(100%, 980px);
  padding: 24px;
  border-radius: 24px;
  background: var(--panel);
  border: 2px solid var(--panel-border);
  box-shadow: var(--shadow);
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(180px, 240px);
  gap: 24px;
  align-items: center;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--text-soft);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-size: 0.8rem;
  font-weight: 700;
}

h1,
h2,
p {
  margin: 0;
}

h1 {
  font-size: clamp(2rem, 4.5vw, 3.3rem);
  line-height: 1.05;
}

.hero-text {
  margin-top: 14px;
  max-width: 56ch;
  line-height: 1.6;
  color: var(--text-soft);
}

.hero-instructions {
  margin-top: 12px;
  display: grid;
  gap: 8px;
  max-width: 68ch;
  line-height: 1.5;
  color: var(--text-soft);
}

.hero-art {
  position: relative;
  min-height: 170px;
  border-radius: 20px;
  background: #f3f7f4;
  border: 2px solid var(--panel-border);
  overflow: hidden;
}

.art-track {
  position: absolute;
  inset: 16px;
  border-radius: 16px;
  background:
    linear-gradient(var(--track), var(--track)) top 26px left 14px / calc(100% - 28px) 14px no-repeat,
    linear-gradient(var(--track), var(--track)) bottom 26px left 14px / calc(100% - 28px) 14px no-repeat,
    linear-gradient(var(--track), var(--track)) top 14px right 30px / 14px calc(100% - 28px) no-repeat;
}

.art-snake {
  position: absolute;
  border-radius: 999px;
}

.art-snake-player {
  left: 20px;
  top: 33px;
  width: 90px;
  height: 14px;
  background: var(--player);
}

.art-snake-enemy {
  right: 36px;
  top: 22px;
  width: 14px;
  height: 92px;
  background: var(--enemy);
}

.art-apple {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--food);
  transform: translate(-50%, -50%);
}

.art-apple::before,
.art-apple::after {
  content: "";
  position: absolute;
}

.art-apple::before {
  top: -6px;
  left: 10px;
  width: 3px;
  height: 8px;
  background: #5b4227;
}

.art-apple::after {
  top: -7px;
  left: 11px;
  width: 10px;
  height: 7px;
  border-radius: 10px 10px 10px 0;
  background: var(--food-leaf);
  transform: rotate(-18deg);
}

.settings {
  display: flex;
  justify-content: flex-end;
  margin: 18px 0 12px;
}

.hud {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
  margin: 0 0 18px;
}

.hud-box {
  padding: 16px;
  border-radius: 16px;
  background: var(--hud-bg);
  border: 2px solid var(--panel-border);
}

.hud-label {
  display: block;
  margin-bottom: 6px;
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-soft);
  font-weight: 700;
}

.hud-value {
  font-size: clamp(1.25rem, 3vw, 2rem);
}

.restart-button,
.toggle-button,
.control-button {
  min-height: 52px;
  min-width: 52px;
  border: 2px solid transparent;
  border-radius: 14px;
  padding: 14px 18px;
  font: inherit;
  font-weight: 800;
  color: var(--accent-text);
  background: linear-gradient(180deg, var(--accent), var(--accent-deep));
  cursor: pointer;
}

.toggle-button {
  color: var(--text-main);
  background: #ffffff;
  border-color: var(--panel-border);
}

.board-wrap {
  position: relative;
  width: min(100%, 520px);
  margin: 0 auto;
  border-radius: 20px;
  overflow: hidden;
  background: var(--board-bg);
  border: 3px solid var(--board-border);
}

.game-board {
  display: block;
  width: 100%;
  height: auto;
  outline: none;
  background: var(--board-bg);
}


.game-status {
  padding: 14px;
  background: #f4f7f3;
  border-top: 2px solid var(--panel-border);
}

.status-card {
  padding: 14px 16px;
  border-radius: 14px;
  background: #ffffff;
  border: 2px solid var(--panel-border);
  color: var(--text-soft);
  line-height: 1.5;
}

.controls {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  padding: 14px;
  background: #f4f7f3;
  border-top: 2px solid var(--panel-border);
}

.control-up {
  grid-column: 2;
}

.control-left {
  grid-column: 1;
}

.control-pause {
  grid-column: 2;
}

.control-right {
  grid-column: 3;
}

.control-down {
  grid-column: 2;
}

:focus-visible {
  outline: 3px solid var(--focus-ring);
  outline-offset: 3px;
}

.board-wrap:focus-within {
  box-shadow: 0 0 0 4px rgba(255, 191, 71, 0.28);
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
  }
}

@media (max-width: 900px) {
  .hud {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 780px) {
  .page {
    padding: 10px 10px 104px;
    align-items: start;
  }

  .game-card {
    padding: 14px;
  }

  .hero {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .hero-art {
    min-height: 104px;
  }

  .settings {
    justify-content: stretch;
  }

  .toggle-button,
  .restart-button {
    width: 100%;
  }

  .board-wrap {
    width: min(100%, 92vw);
  }

  .game-board {
    max-height: 48vh;
    object-fit: contain;
  }

  .game-status {
    padding: 10px;
  }

  .status-card {
    padding: 12px 14px;
    font-size: 0.95rem;
  }

  .controls {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 20;
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 8px;
    padding: 10px;
    background: rgba(244, 247, 243, 0.98);
    border-top: 2px solid var(--panel-border);
  }

  .control-up,
  .control-left,
  .control-pause,
  .control-right,
  .control-down {
    grid-column: auto;
  }

  .control-button {
    min-height: 56px;
    padding: 12px 8px;
    font-size: 0.95rem;
  }
}

@media (max-width: 560px) {
  .hud {
    grid-template-columns: 1fr;
  }

  .hero-text,
  .hero-instructions,
  .status-card {
    font-size: 0.95rem;
  }
}

@media (max-height: 1100px) {
  .page {
    place-items: start center;
    padding-bottom: 92px;
  }

  .game-card {
    padding: 14px;
  }

  .hero {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .hero-art {
    display: none;
  }

  .hero-text {
    margin-top: 8px;
  }

  .hero-instructions {
    margin-top: 8px;
    gap: 6px;
    font-size: 0.95rem;
  }

  .settings {
    margin: 12px 0 10px;
  }

  .hud {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 10px;
    margin-bottom: 12px;
  }

  .hud-box {
    padding: 12px 14px;
  }

  .hud-value {
    font-size: 1.3rem;
  }

  .board-wrap {
    width: min(100%, 72vh);
    max-width: 520px;
  }

  .game-board {
    max-height: 54vh;
  }

  .game-status {
    padding: 8px 10px;
  }

  .status-card {
    padding: 10px 12px;
    font-size: 0.95rem;
  }

  .controls {
    position: fixed;
    left: 50%;
    right: auto;
    bottom: 8px;
    z-index: 30;
    width: min(calc(100vw - 16px), 820px);
    transform: translateX(-50%);
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 8px;
    padding: 8px;
    border: 2px solid var(--panel-border);
    border-radius: 18px;
    background: rgba(244, 247, 243, 0.98);
    box-shadow: var(--shadow);
  }

  .control-up,
  .control-left,
  .control-pause,
  .control-right,
  .control-down {
    grid-column: auto;
  }

  .control-button {
    min-height: 50px;
    padding: 10px 8px;
    font-size: 0.92rem;
  }
}

@media (max-width: 900px) and (max-height: 1100px) {
  .hud {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 780px) and (max-height: 1100px) {
  .page {
    padding-bottom: 88px;
  }

  .controls {
    padding: 8px;
  }

  .control-button {
    min-height: 48px;
    font-size: 0.88rem;
  }
}

@media (max-width: 560px) and (max-height: 1100px) {
  .hud {
    grid-template-columns: 1fr;
  }

  .board-wrap {
    width: min(100%, 94vw);
  }

  .game-board {
    max-height: 46vh;
  }

  .status-card {
    font-size: 0.9rem;
  }
}