* {
  box-sizing: border-box;
  font-family: Arial, sans-serif;
}

body {
  margin: 0;
  background: #0f172a;
  color: #fff;
}

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px;
  background: #020617;
}

header h1 {
  margin: 0;
}

.auth-buttons button {
  margin-left: 10px;
  padding: 8px 14px;
  border: none;
  cursor: pointer;
  border-radius: 6px;
  background: #2563eb;
  color: white;
}

main {
  padding: 30px;
}

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

.game-card {
  background: #020617;
  padding: 20px;
  border-radius: 12px;
  box-shadow: 0 0 10px rgba(0,0,0,0.4);
}

.game-card h3 {
  margin-top: 0;
}

.game-card button {
  margin-top: 10px;
  padding: 10px;
  width: 100%;
  border: none;
  border-radius: 8px;
  background: #22c55e;
  color: black;
  cursor: pointer;
}

.leaderboard-section {
  margin-top: 40px;
  text-align: center;
}

#leaderboardBtn {
  padding: 12px 20px;
  font-size: 16px;
  border-radius: 10px;
  border: none;
  background: gold;
  cursor: pointer;
}