/* Chapter 3: larger labels on phones in the wide drawings of 3.1 and 3.2. */
@media (max-width: 520px) {
  #v3-1 .stage .lbl { font-size: 22px; }
  #v3-2 .stage .lbl { font-size: 19px; }
  #v3-2 .stage .lbl.small { font-size: 16px; }
  #v3-2 .stage .lbl.big { font-size: 22px; }
  #v3-2 .stage .pt-label { font-size: 18px; }
}

/* 3.4: the tall drawing stays a sensible size on wide screens; labels grow on phones. */
#v3-4 .stage svg { max-width: 600px; margin: 0 auto; }
#v3-4 .stage .lbl { font-size: 17px; }
#v3-4 .stage .lbl.small { font-size: 14px; }
#v3-4 .stage .lbl.big { font-size: 22px; }
@media (max-width: 520px) {
  #v3-4 .stage .lbl { font-size: 23px; }
  #v3-4 .stage .lbl.small { font-size: 20px; }
  #v3-4 .stage .lbl.big { font-size: 28px; }
}