:root {
  color-scheme: dark;
  --bg: #101214;
  --panel: #191d20;
  --panel-light: #22282c;
  --text: #f4f7f5;
  --muted: #aeb8b1;
  --accent: #5dd39e;
  --accent-strong: #2fbf71;
  --danger: #ff6b6b;
  --grid: rgba(255, 255, 255, 0.06);
  --shadow: 0 18px 45px rgba(0, 0, 0, 0.35);
}

* {
  box-sizing: border-box;
}

body {
  min-height: 100vh;
  margin: 0;
  display: grid;
  place-items: center;
  padding: 24px;
  background:
    radial-gradient(circle at top left, rgba(93, 211, 158, 0.18), transparent 32rem),
    linear-gradient(135deg, #101214 0%, #171b1d 55%, #0e1113 100%);
  color: var(--text);
  font-family: "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
}

button {
  border: 0;
  cursor: pointer;
  font: inherit;
}

.game-shell {
  width: min(100%, 640px);
  display: grid;
  gap: 16px;
}

.top-bar,
.controls {
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 8px;
  background: rgba(25, 29, 32, 0.88);
  box-shadow: var(--shadow);
}

.top-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px;
}

.eyebrow {
  margin: 0 0 4px;
  color: var(--accent);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1,
h2,
p {
  margin: 0;
}

h1 {
  font-size: clamp(28px, 8vw, 42px);
  line-height: 1;
}

.score-board {
  display: flex;
  gap: 10px;
}

.score-board div {
  min-width: 86px;
  padding: 10px 12px;
  border-radius: 8px;
  background: var(--panel-light);
  text-align: center;
}

.score-board span {
  display: block;
  margin-bottom: 4px;
  color: var(--muted);
  font-size: 13px;
}

.score-board strong {
  display: block;
  font-size: 24px;
  line-height: 1;
}

.play-area {
  position: relative;
  aspect-ratio: 1;
  width: 100%;
  overflow: hidden;
  border: 2px solid rgba(141, 230, 181, 0.55);
  border-radius: 8px;
  background: #0b0f0d;
  box-shadow:
    0 0 0 1px rgba(255, 255, 255, 0.08) inset,
    0 0 22px rgba(93, 211, 158, 0.18),
    var(--shadow);
}

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

.overlay {
  position: absolute;
  inset: 0;
  display: grid;
  place-content: center;
  gap: 10px;
  padding: 24px;
  background: rgba(10, 13, 12, 0.72);
  text-align: center;
  transition: opacity 160ms ease, visibility 160ms ease;
}

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

.overlay h2 {
  font-size: clamp(28px, 7vw, 44px);
}

.overlay p {
  color: var(--muted);
  font-size: 16px;
}

.controls {
  display: grid;
  gap: 14px;
  padding: 16px;
}

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

.button-row button,
.pad-btn {
  min-height: 46px;
  border-radius: 8px;
  background: var(--panel-light);
  color: var(--text);
  font-weight: 700;
  transition: transform 120ms ease, background 120ms ease, color 120ms ease;
}

.button-row button:hover,
.pad-btn:hover {
  background: #2d3538;
}

.button-row button:active,
.pad-btn:active {
  transform: translateY(1px) scale(0.98);
}

#startBtn {
  background: var(--accent);
  color: #07100b;
}

#startBtn:hover {
  background: #79e4b3;
}

.mobile-pad {
  width: 168px;
  height: 168px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(3, 52px);
  grid-template-rows: repeat(3, 52px);
  gap: 6px;
}

.pad-btn {
  min-height: 52px;
  font-size: 24px;
}

.pad-btn.up {
  grid-column: 2;
  grid-row: 1;
}

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

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

.pad-btn.down {
  grid-column: 2;
  grid-row: 3;
}

@media (max-width: 560px) {
  body {
    padding: 12px;
  }

  .top-bar {
    align-items: stretch;
    flex-direction: column;
  }

  .score-board {
    width: 100%;
  }

  .score-board div {
    flex: 1;
  }

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