* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
html, body { margin: 0; height: 100%; overflow: hidden; }
body {
  background: linear-gradient(180deg, #0b1026 0%, #131a3a 60%, #1d1440 100%);
  color: #e6edf3; font-family: "Pretendard", -apple-system, "Noto Sans KR", sans-serif;
  user-select: none; display: flex; flex-direction: column;
}
.hud {
  display: flex; justify-content: space-between; align-items: center;
  padding: 14px 22px; z-index: 5;
}
.score-box { font-size: 44px; font-weight: 900; font-variant-numeric: tabular-nums; }
.score-box .label { font-size: 16px; color: #8b949e; margin-left: 6px; font-weight: 400; }
.best-box { font-size: 14px; color: #8b949e; }
#game { flex: 1; width: 100%; touch-action: none; cursor: pointer; }
.hint { text-align: center; color: #8b949e; font-size: 13px; margin: 8px 0 14px; }
.overlay {
  position: fixed; inset: 0; background: rgba(5, 8, 18, 0.85);
  display: flex; align-items: center; justify-content: center; z-index: 20;
}
.overlay.hidden { display: none; }
.overlay-box { text-align: center; background: #161b33; border: 1px solid #2d3a5e; border-radius: 20px; padding: 36px 48px; }
.overlay-box h1 { margin: 0 0 8px; font-size: 34px; }
#newBest { color: #3fb950; font-weight: 700; }
#newBest.hidden { display: none; }
.btn {
  background: linear-gradient(92deg, #4f7cff, #a06bff); color: #fff; border: none;
  border-radius: 12px; padding: 14px 40px; font-size: 17px; font-weight: 800; cursor: pointer; margin-top: 14px;
}