.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 10px;
  padding: 10px;
  border-bottom: 1px solid #ddd;
  font-family: system-ui, -apple-system, sans-serif;
}

.topbar .brand {
  font-weight: bold;
}

.topbar .user {
  margin-right: 10px;
  color: #666;
  font-size: 0.9rem;
}

.topbar a {
  color: #333;
  font-size: 0.9rem;
}

.paid-box {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 10px;
}

.paid-box pre {
  margin: 0;
  padding: 10px;
  background: #fdf3d7;
}

.box {
  display: grid;
  gap: 10px;
}

.box pre {
  margin: 0;
  padding: 10px;
  background: #eee;
}

@media (min-width: 768px) {
  .box {
    grid-template-columns: 1fr 1fr;
    grid-template-areas:
      "b3 b4"
      "b5 b5"
      "b6 b6"
      "b7 b7";
  }

  .b3 { grid-area: b3; }
  .b4 { grid-area: b4; }
  .b5 { grid-area: b5; }
  .b6 { grid-area: b6; }
  .b7 { grid-area: b7; }
}