body {
  font-family: sans-serif;
  padding: 40px;
}

h1 { margin-bottom: 4px; }
p  { margin-bottom: 24px; }

.grid {
  display: grid;
  grid-template-columns: repeat(3, 200px);
  gap: 20px;
  margin-bottom: 32px;
}

.grid a {
  display: block;
  text-decoration: none;
  color: black;
  border: 2px solid transparent;
}

.grid a:hover {
  border-color: #999;
}

.grid a.selected {
  border-color: orange;
}

.grid img {
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
  display: block;
}

.grid p {
  margin: 4px 0 0 0;
  font-size: 0.85rem;
}

.difficulty {
  margin-bottom: 20px;
}

.difficulty label {
  margin-right: 8px;
}

button {
  margin-right: 8px;
  padding: 6px 14px;
  font-size: 0.9rem;
  cursor: pointer;
}

button.active {
  background: orange;
  border-color: orange;
}

#start-btn {
  display: block;
  margin-top: 16px;
  padding: 10px 28px;
  font-size: 1rem;
  cursor: pointer;
  opacity: 0.4;
  pointer-events: none;
}

#start-btn.ready {
  opacity: 1;
  pointer-events: auto;
}