/* Polystyrene category introduction; reuse the existing material-page palette. */
.polystyrene-guide{border-bottom:1px solid var(--line)}
.polystyrene-examples{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:28px}
.polystyrene-examples article{min-width:0}
.polystyrene-examples img{display:block;width:100%;aspect-ratio:4/3;object-fit:contain;background:var(--warm);border-radius:4px}
.polystyrene-examples h3{display:flex;align-items:center;justify-content:space-between;gap:12px;font-size:20px;line-height:1.5;margin:18px 0 8px}
.polystyrene-examples a:hover h3{color:var(--accent)}
.polystyrene-examples p{font-size:15px;line-height:1.8}
.polystyrene-note{font-size:13px;margin-top:24px;color:var(--muted)}
.polystyrene-reading{display:grid;gap:8px;margin-top:24px}
.polystyrene-reading a{display:flex;align-items:center;min-height:44px;padding-block:8px;border-bottom:1px solid var(--line);font-size:14px}
.polystyrene-reading a:hover{color:var(--accent)}
@media(max-width:640px){
 .polystyrene-examples{grid-template-columns:1fr;gap:28px}
 .polystyrene-examples article{display:grid;grid-template-columns:1fr;gap:0}
 .polystyrene-examples img{aspect-ratio:3/2;max-height:260px}
 .polystyrene-examples h3{font-size:19px;margin-top:14px}
 .polystyrene-examples p{font-size:14px}
}