* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }

body {
  margin: 0;
  min-height: 100vh;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: #1a1a1a;
  color: white;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding-top: 50px;
  position: relative;
}

#rule-display {
  font-size: 1.5rem;
  margin-bottom: 2rem;
  color: #fbbf24;
}

.grid {
  display: grid;
  grid-template-columns: repeat(4, 80px);
  grid-auto-rows: 80px;
  gap: 15px;
  touch-action: none;
}

.cell {
  background: #374151;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  font-weight: bold;
  user-select: none;
}

#frog {
  position: absolute;
  font-size: 3rem;
  transition: all 0.3s ease-out;
  pointer-events: none;
  z-index: 10;
}