body {
  margin: 0;
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  font-family: Arial, sans-serif;
  background: linear-gradient(135deg, #6a11cb, #2575fc);
  color: white;
}

.container {
  text-align: center;
}

h1 {
  margin-bottom: 20px;
}

.board {
  display: grid;
  grid-template-columns: repeat(3, 100px);
  grid-template-rows: repeat(3, 100px);
  gap: 10px;
  justify-content: center;
  margin-bottom: 20px;
}

.cell {
  width: 100px;
  height: 100px;
  background: white;
  border-radius: 10px;
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 2.5rem;
  font-weight: bold;
  color: black;
  cursor: pointer;
  user-select: none;
}

#status {
  margin: 10px 0 20px;
  font-size: 18px;
}

button {
  background: black;
  color: white;
  border: none;
  padding: 10px 20px;
  border-radius: 6px;
  font-size: 16px;
  cursor: pointer;
  transition: 0.3s;
}

button:hover {
  background: #333;
}

/* Overlay */
.overlay {
  position: fixed;
  top: 0; left: 0; width: 100%; height: 100%;
  background: rgba(0,0,0,0.7);
  display: flex;
  justify-content: center;
  align-items: center;
}

.hidden {
  display: none;
}

.overlay-box {
  background: white;
  padding: 30px;
  border-radius: 12px;
  text-align: center;
  color: black;
}

.overlay-box h2 {
  margin-bottom: 20px;
}