:root {
  --bg: #10131b;
  --panel: #181e2a;
  --panel-strong: #202838;
  --line: #30394c;
  --text: #f3f7fb;
  --muted: #8e9cb2;
  --green: #4ee88b;
  --green-dark: #1fa85c;
  --yellow: #ffd166;
  --red: #ff5c77;
  --shadow: 0 24px 70px rgba(0, 0, 0, 0.35);
}

* {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  display: grid;
  place-items: center;
  min-height: 100vh;
  padding: 24px;
  background:
    radial-gradient(circle at 18% 12%, rgba(78, 232, 139, 0.16), transparent 28%),
    radial-gradient(circle at 82% 84%, rgba(255, 209, 102, 0.14), transparent 30%),
    linear-gradient(145deg, #10131b 0%, #141927 54%, #0d1018 100%);
  color: var(--text);
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
}

button {
  border: 0;
  font: inherit;
}

.game-shell {
  width: min(100%, 720px);
  display: grid;
  gap: 16px;
}

.score-panel {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 18px;
  padding: 18px;
  background: rgba(24, 30, 42, 0.9);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 8px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(14px);
}

.eyebrow {
  margin: 0 0 5px;
  color: var(--green);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1 {
  margin: 0;
  font-size: clamp(32px, 7vw, 56px);
  line-height: 0.9;
  letter-spacing: 0;
}

.stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(72px, 1fr));
  gap: 10px;
}

.stat {
  min-width: 72px;
  padding: 10px 12px;
  background: var(--panel-strong);
  border: 1px solid var(--line);
  border-radius: 8px;
  text-align: center;
}

.stat span {
  display: block;
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
}

.stat strong {
  display: block;
  margin-top: 4px;
  color: var(--yellow);
  font-size: 24px;
  line-height: 1;
}

.board-wrap {
  position: relative;
  width: min(100%, 620px);
  justify-self: center;
  aspect-ratio: 1;
  padding: 14px;
  background:
    linear-gradient(135deg, rgba(78, 232, 139, 0.26), rgba(255, 209, 102, 0.18)),
    var(--panel);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

canvas {
  display: block;
  width: 100%;
  height: 100%;
  background: #0b0f16;
  border-radius: 6px;
  image-rendering: pixelated;
}

.overlay {
  position: absolute;
  inset: 14px;
  display: grid;
  place-content: center;
  gap: 8px;
  text-align: center;
  background: rgba(10, 14, 20, 0.66);
  border-radius: 6px;
  transition: opacity 160ms ease, visibility 160ms ease;
}

.overlay.hidden {
  opacity: 0;
  visibility: hidden;
}

.overlay strong {
  font-size: clamp(26px, 6vw, 44px);
}

.overlay span {
  color: var(--muted);
  font-size: 15px;
  font-weight: 700;
}

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

.controls button,
.touch {
  min-height: 48px;
  color: var(--text);
  background: var(--panel-strong);
  border: 1px solid var(--line);
  border-radius: 8px;
  cursor: pointer;
  font-size: 15px;
  font-weight: 800;
  transition: transform 140ms ease, border-color 140ms ease, background 140ms ease;
}

.controls button:first-child {
  color: #07100b;
  background: var(--green);
  border-color: var(--green);
}

.controls button:hover,
.touch:hover {
  transform: translateY(-1px);
  border-color: var(--green);
}

.touch-pad {
  display: none;
  grid-template-columns: repeat(3, 64px);
  justify-content: center;
  gap: 8px;
}

.touch {
  width: 64px;
  height: 54px;
  font-size: 22px;
}

.touch.center {
  color: var(--yellow);
}

.touch.empty {
  visibility: hidden;
}

@media (max-width: 640px) {
  body {
    align-items: start;
    padding: 14px;
  }

  .score-panel {
    align-items: stretch;
    flex-direction: column;
  }

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

  .board-wrap {
    padding: 10px;
  }

  .overlay {
    inset: 10px;
  }

  .touch-pad {
    display: grid;
  }
}