:root {
  --bg-0: #07111c;
  --bg-1: #0d1a29;
  --panel: rgba(7, 15, 26, 0.88);
  --panel-strong: rgba(10, 23, 38, 0.96);
  --line: rgba(153, 230, 179, 0.16);
  --text: #ecfff3;
  --muted: #9fc7b2;
  --accent: #58f08a;
  --accent-2: #a8ff73;
  --danger: #ff6b6b;
  --food: #ff8f4a;
  --shadow: 0 24px 80px rgba(0, 0, 0, 0.36);
  --radius-lg: 32px;
  --radius-md: 22px;
  --radius-sm: 16px;
  --cell-count: 20;
}

* {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  color: var(--text);
  font-family: "Noto Sans SC", sans-serif;
  background:
    linear-gradient(180deg, rgba(7, 17, 28, 0.55), rgba(7, 17, 28, 0.96)),
    radial-gradient(circle at top, rgba(88, 240, 138, 0.12), transparent 34%),
    var(--bg-0);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(3, 9, 16, 0.22), rgba(3, 9, 16, 0.72)),
    url("./assets/snake-hero-bg.png") center top / cover no-repeat;
  opacity: 0.88;
  z-index: -2;
}

body::after {
  content: "";
  position: fixed;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(4, 10, 18, 0.18), rgba(4, 10, 18, 0.82)),
    url("./assets/snake-panel-texture.png") center / 520px repeat;
  mix-blend-mode: screen;
  opacity: 0.18;
  z-index: -1;
  pointer-events: none;
}

.page-shell {
  min-height: 100vh;
  padding: 32px 18px 40px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.game-frame {
  width: min(1200px, 100%);
}

.hero-copy {
  margin-bottom: 24px;
  text-align: center;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--accent-2);
  font-family: "Orbitron", sans-serif;
  font-size: 0.86rem;
  letter-spacing: 0.28em;
  text-transform: uppercase;
}

.hero-copy h1 {
  margin: 0;
  font-family: "Orbitron", sans-serif;
  font-size: clamp(2.4rem, 7vw, 4.8rem);
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  text-shadow: 0 0 20px rgba(88, 240, 138, 0.28);
}

.intro {
  width: min(640px, 100%);
  margin: 14px auto 0;
  color: var(--muted);
  font-size: 1rem;
  line-height: 1.7;
}

.game-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(320px, 0.8fr);
  gap: 24px;
  align-items: start;
}

.board-card,
.action-card,
.info-card {
  position: relative;
  overflow: hidden;
  background:
    linear-gradient(180deg, rgba(9, 19, 33, 0.94), rgba(8, 17, 28, 0.88)),
    url("./assets/snake-panel-texture.png") center / 640px repeat;
  border: 1px solid rgba(126, 218, 165, 0.14);
  box-shadow: var(--shadow);
}

.board-card {
  padding: 18px;
  border-radius: var(--radius-lg);
}

.board-card::before,
.action-card::before,
.info-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(88, 240, 138, 0.1), transparent 32%);
  pointer-events: none;
}

.stats-bar {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin-bottom: 18px;
}

.stat {
  padding: 14px 16px;
  border-radius: var(--radius-sm);
  background: rgba(8, 19, 31, 0.8);
  border: 1px solid rgba(150, 237, 185, 0.12);
}

.label {
  display: block;
  margin-bottom: 6px;
  color: var(--muted);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.stat strong {
  font-family: "Noto Sans SC", sans-serif;
  font-size: 1.28rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.board-wrap {
  position: relative;
  aspect-ratio: 1;
  border-radius: 24px;
  overflow: hidden;
  background:
    radial-gradient(circle at top, rgba(88, 240, 138, 0.12), transparent 35%),
    linear-gradient(180deg, rgba(7, 15, 26, 0.92), rgba(3, 9, 16, 0.92));
  border: 1px solid rgba(160, 244, 196, 0.16);
}

#game-board {
  display: block;
  width: 100%;
  height: 100%;
}

.board-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  background: rgba(4, 10, 16, 0.4);
  backdrop-filter: blur(4px);
  transition: opacity 180ms ease;
}

.board-overlay.is-hidden {
  opacity: 0;
  pointer-events: none;
}

.overlay-card {
  max-width: 420px;
  padding: 26px 28px;
  text-align: center;
  border-radius: 26px;
  background: rgba(7, 16, 27, 0.84);
  border: 1px solid rgba(165, 247, 199, 0.15);
  box-shadow: 0 18px 60px rgba(0, 0, 0, 0.32);
}

.overlay-kicker {
  margin: 0 0 8px;
  color: var(--accent-2);
  font-family: "Orbitron", sans-serif;
  font-size: 0.78rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
}

.overlay-card h2 {
  margin: 0;
  font-size: clamp(1.6rem, 4vw, 2.2rem);
}

.overlay-card p {
  margin: 12px 0 0;
  color: var(--muted);
  line-height: 1.7;
}

.side-panel {
  display: grid;
  gap: 18px;
}

.action-card,
.info-card {
  padding: 22px;
  border-radius: var(--radius-md);
}

.action-card h2,
.info-card h2 {
  margin: 0 0 14px;
  font-size: 1.08rem;
}

.info-card p {
  margin: 0;
  color: var(--muted);
  line-height: 1.75;
}

.button-row {
  display: grid;
  gap: 12px;
}

.action-btn,
.dpad-btn {
  appearance: none;
  border: 0;
  cursor: pointer;
  color: var(--text);
  font-family: inherit;
  transition:
    transform 140ms ease,
    box-shadow 140ms ease,
    background-color 140ms ease,
    opacity 140ms ease;
}

.action-btn {
  padding: 14px 18px;
  border-radius: 999px;
  background: linear-gradient(180deg, rgba(18, 37, 57, 0.95), rgba(11, 22, 36, 0.95));
  border: 1px solid rgba(155, 239, 189, 0.18);
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.18);
  font-size: 0.98rem;
  font-weight: 700;
}

.action-btn:hover:not(:disabled),
.dpad-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 16px 28px rgba(0, 0, 0, 0.24);
}

.action-btn:active:not(:disabled),
.dpad-btn:active {
  transform: translateY(1px) scale(0.98);
}

.action-btn:disabled {
  cursor: not-allowed;
  opacity: 0.42;
}

.action-btn--primary {
  background: linear-gradient(180deg, rgba(98, 255, 151, 0.94), rgba(62, 202, 110, 0.94));
  color: #062012;
}

.mobile-controls-card {
  display: none;
}

.dpad {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  grid-template-areas:
    ". up ."
    "left . right"
    ". down .";
  gap: 10px;
}

.dpad-btn {
  min-height: 68px;
  border-radius: 22px;
  background: linear-gradient(180deg, rgba(18, 39, 60, 0.95), rgba(10, 23, 36, 0.95));
  border: 1px solid rgba(155, 239, 189, 0.18);
  box-shadow: 0 12px 24px rgba(0, 0, 0, 0.24);
  font-size: 1.36rem;
  font-weight: 700;
}

.dpad-btn--up {
  grid-area: up;
}

.dpad-btn--left {
  grid-area: left;
}

.dpad-btn--right {
  grid-area: right;
}

.dpad-btn--down {
  grid-area: down;
}

@media (max-width: 899px) {
  .game-layout {
    grid-template-columns: 1fr;
  }

  .side-panel {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    align-items: start;
  }

  .action-card {
    grid-column: 1 / -1;
  }
}

@media (max-width: 599px) {
  .page-shell {
    padding: 20px 12px 30px;
  }

  .hero-copy {
    margin-bottom: 18px;
  }

  .intro {
    font-size: 0.95rem;
  }

  .board-card {
    padding: 14px;
    border-radius: 26px;
  }

  .stats-bar {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .stat:last-child {
    grid-column: 1 / -1;
  }

  .side-panel {
    grid-template-columns: 1fr;
  }

  .mobile-controls-card {
    display: block;
  }
}

@media (pointer: coarse) {
  .mobile-controls-card {
    display: block;
  }
}