/* Keep five concept links usable on small screens. */
@media(max-width:620px){
  .concept-nav{width:calc(100% - 1rem);max-width:none;display:grid;grid-template-columns:repeat(5,minmax(0,1fr));border-radius:18px;overflow:hidden}
  .concept-nav a{min-width:0;padding:.6rem .2rem;flex-direction:column;gap:.1rem;text-align:center}
  .concept-nav a span{display:block;white-space:normal;font-size:.56rem;line-height:1.05}
  .concept-nav a b{font-size:.54rem}
  .pick .roundel{width:132px;height:132px;right:-4px;bottom:-28px;padding:18px 12px;box-sizing:border-box;font-size:.66rem;line-height:1.05}
  .pick .roundel b{display:block;font-size:1.85rem;line-height:.9;margin:.12rem 0}
}