body {
  font-family: "Segoe UI", Arial, sans-serif;
  background: #f2f4f7;
  margin: 0;
}

header {
  background: linear-gradient(90deg, #004c99, #0066cc);
  color: white;
  padding: 18px;
  text-align: center;
}

.container {
  max-width: 1000px;
  margin: auto;
  padding: 30px;
}

.menu {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 30px;
}

.card {
  background: white;
  border-radius: 10px;
  padding: 30px;
  text-align: center;
  box-shadow: 0 4px 12px rgba(0,0,0,0.08);
  text-decoration: none;
  color: #333;
  transition: 0.2s;
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: 0 6px 16px rgba(0,0,0,0.15);
}

.card span {
  font-size: 48px;
}

.level {
  margin: 15px 0;
}

button {
  background: #0066cc;
  color: white;
  border: none;
  padding: 8px 16px;
  border-radius: 6px;
  cursor: pointer;
}

button:hover {
  background: #004c99;
}

.board {
  display: grid;
  margin: 20px auto;
}