body {
  font-family: "Inter", sans-serif;
  background-color: #f6f8fa;
  color: #24292e;
  margin: 0;
  padding: 0;
}

header {
  text-align: center;
  padding: 2rem 1rem;
  background: #24292e;
  color: #fff;
}

header h1 {
  margin: 0;
  font-size: 1.8rem;
}

header p {
  color: #c9d1d9;
}

.tile-container {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1.5rem;
  padding: 2rem;
}

.tile {
  background: #fff;
  border: 1px solid #d0d7de;
  border-radius: 12px;
  width: 260px;
  padding: 1.5rem;
  text-align: center;
  box-shadow: 0 2px 6px rgba(0,0,0,0.05);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  text-decoration: none;
  color: #24292e;
}

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

.tile.disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

footer {
  text-align: center;
  padding: 1rem;
  background: #f1f3f5;
  color: #555;
}