body {
  margin: 0;
  font-family: 'Segoe UI', sans-serif;
  background: #0a0a14;
  color: #fff;
}

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 15px 30px;
  background: #111122;
  box-shadow: 0 0 15px #00f7ff44;
}

.logo {
  font-size: 22px;
  font-weight: bold;
  color: #00f7ff;
  text-shadow: 0 0 10px #00f7ff;
}

nav a {
  margin: 0 15px;
  color: white;
  text-decoration: none;
  transition: 0.3s;
}

nav a:hover {
  color: #ff00ff;
  text-shadow: 0 0 10px #ff00ff;
}

.button {
  padding: 10px 20px;
  background: #00f7ff;
  border: none;
  border-radius: 5px;
  cursor: pointer;
  color: black;
  font-weight: bold;
  box-shadow: 0 0 15px #00f7ff;
}

.button:hover {
  background: #ff00ff;
  box-shadow: 0 0 15px #ff00ff;
}

.games-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 20px;
  padding: 40px;
}

.game-card {
  background: #14142a;
  padding: 15px;
  border-radius: 10px;
  cursor: pointer;
  transition: 0.3s;
  box-shadow: 0 0 10px #00f7ff33;
}

.game-card:hover {
  transform: scale(1.05);
  box-shadow: 0 0 20px #ff00ff;
}

.tictactoe-grid {
  display: grid;
  grid-template-columns: repeat(3, 100px);
  gap: 10px;
  margin-top: 20px;
}

.cell {
  width: 100px;
  height: 100px;
  background: #1a1a33;
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 40px;
  cursor: pointer;
  border-radius: 10px;
  box-shadow: 0 0 10px #00f7ff55;
}