body {
  font: 16px system-ui;
  margin: 2rem;
}

.tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 1rem;
}

.tab {
  padding: 0.5rem 1rem;
  border: 1px solid #ccc;
  border-radius: 10px;
  cursor: pointer;
}

.tab.active {
  background: #111;
  color: #fff;
  border-color: #111;
}

.panel {
  display: none;
  max-width: 780px;
}

.panel.active {
  display: block;
}

.box {
  border: 2px dashed #aaa;
  border-radius: 12px;
  padding: 1.5rem;
  margin: 0.5rem 0;
}

label {
  display: block;
  margin: 0.25rem 0;
}

.row {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.hint {
  color: #666;
  font-size: 12px;
}