body {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  background: linear-gradient(135deg, #1f1c2c, #928dab);
  color: #fff;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  margin: 0;
  overflow-x: hidden;
}

.container {
  text-align: center;
  width: 90%;
  max-width: 400px;
  position: relative;
}

h1 { margin-bottom: 20px; font-size: 2rem; }

#menu p { font-size: 1.2rem; margin-bottom: 15px; }

button {
  padding: 10px 20px;
  margin: 5px;
  font-size: 1rem;
  cursor: pointer;
  border: none;
  border-radius: 8px;
  background-color: #ff4d4d;
  color: #fff;
  transition: background 0.3s ease;
}

button:hover { background-color: #ff1a1a; }

.hidden { display: none; }

.board {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin: 20px 0;
  position: relative;
  z-index: 2;
}

.cell {
  background-color: rgba(255,255,255,0.1);
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 2.5rem;
  cursor: pointer;
  border-radius: 15px;
  transition: all 0.3s ease;
  aspect-ratio: 1 / 1;
}

.cell:hover { background-color: rgba(255,255,255,0.2); transform: scale(1.1); }
.cell.x { color: #ff4d4d; animation: pop 0.3s ease; }
.cell.o { color: #4dffb8; animation: pop 0.3s ease; }

@keyframes pop {
  0% { transform: scale(0); }
  70% { transform: scale(1.2); }
  100% { transform: scale(1); }
}

#message { font-size: 1.2rem; margin-bottom: 10px; }

.buttons { display: flex; justify-content: center; flex-wrap: wrap; }

#confettiCanvas {
  position: absolute;
  top: 0; left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 1;
}

@media (max-width: 500px) { .cell { font-size: 2rem; } }