body {
  margin: 0;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: linear-gradient(135deg, #0f0c29, #302b63, #24243e);
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  color: white;
  overflow: hidden;
}

.container {
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
  padding: 30px;
  border-radius: 20px;
  text-align: center;
  box-shadow: 0 15px 35px rgba(0,0,0,0.5);
  border: 1px solid rgba(255,255,255,0.1);
}

#board {
  display: grid;
  grid-template-columns: repeat(3, 100px);
  grid-template-rows: repeat(3, 100px);
  gap: 10px;
  margin: 20px auto;
}

.cell {
  background: rgba(0, 0, 0, 0.3);
  border-radius: 12px;
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 3rem;
  font-weight: bold;
  cursor: pointer;
  transition: all 0.2s;
}

.cell:hover {
  background: rgba(255, 255, 255, 0.1);
  transform: scale(1.02);
}

button {
  background: #ff4b2b;
  background: linear-gradient(to right, #ff416c, #ff4b2b);
  color: white;
  border: none;
  padding: 12px 25px;
  font-size: 1rem;
  border-radius: 30px;
  cursor: pointer;
  box-shadow: 0 4px 15px rgba(255, 75, 43, 0.3);
  transition: transform 0.2s;
}

button:hover {
  transform: translateY(-2px);
}

#celebration {
  position: fixed;
  top: 0; left: 0; width: 100%; height: 100%;
  background: rgba(0, 0, 0, 0.85);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  z-index: 1000;
  font-size: 4rem;
  text-align: center;
  cursor: pointer;
}

.hidden { display: none !important; }