/* Each lower-semester lesson has an image painted for its own subject. */
.lesson-53 .hero { background-image: url("lower-53.jpg"); }
.lesson-54 .hero { background-image: url("lower-54.jpg"); }
.lesson-55 .hero { background-image: url("lower-55.jpg"); }
.lesson-56 .hero { background-image: url("lower-56.jpg"); }
.lesson-57 .hero { background-image: url("lower-57.jpg"); }
.lesson-58 .hero { background-image: url("lower-58.jpg"); }
.lesson-59 .hero { background-image: url("lower-59.jpg"); }
.lesson-60 .hero { background-image: url("lower-60.jpg"); }
.lesson-61 .hero { background-image: url("lower-61.jpg"); }
.lesson-62 .hero { background-image: url("lower-62.jpg"); }
.lesson-63 .hero { background-image: url("lower-63.jpg"); }
.lesson-64 .hero { background-image: url("lower-64.jpg"); }
.lesson-65 .hero { background-image: url("lower-65.jpg"); }
.lesson-66 .hero { background-image: url("lower-66.jpg"); }
.lesson-67 .hero { background-image: url("lower-67.jpg"); }
.lesson-68 .hero { background-image: url("lower-68.jpg"); }
.lesson-69 .hero { background-image: url("lower-69.jpg"); }
.lesson-70 .hero { background-image: url("lower-70.jpg"); }
.lesson-71 .hero { background-image: url("lower-71.jpg"); }
.lesson-72 .hero { background-image: url("lower-72.jpg"); }
.lesson-73 .hero { background-image: url("lower-73.jpg"); }
.lesson-74 .hero { background-image: url("lower-74.jpg"); }
.lesson-75 .hero { background-image: url("lower-75.jpg"); }
.lesson-76 .hero { background-image: url("lower-76.jpg"); }
.lesson-77 .hero { background-image: url("lower-77.jpg"); }
.lesson-78 .hero { background-image: url("lower-78.jpg"); }
.lesson-79 .hero { background-image: url("lower-79.jpg"); }
.lesson-80 .hero { background-image: url("lower-80.jpg"); }
.lesson-81 .hero { background-image: url("lower-81.jpg"); }
.lesson-82 .hero { background-image: url("lower-82.jpg"); }
.lesson-83 .hero { background-image: url("lower-83.jpg"); }
.lesson-84 .hero { background-image: url("lower-84.jpg"); }
.lesson-85 .hero { background-image: url("lower-85.jpg"); }
.lesson-86 .hero { background-image: url("lower-86.jpg"); }
.lesson-87 .hero { background-image: url("lower-87.jpg"); }
.lesson-88 .hero { background-image: url("lower-88.jpg"); }
.lesson-89 .hero { background-image: url("lower-89.jpg"); }
.lesson-90 .hero { background-image: url("lower-90.jpg"); }
.lesson-91 .hero { background-image: url("lower-91.jpg"); }
.lesson-92 .hero { background-image: url("lower-92.jpg"); }
.lesson-93 .hero { background-image: url("lower-93.jpg"); }
.lesson-94 .hero { background-image: url("lower-94.jpg"); }
.lesson-95 .hero { background-image: url("lower-95.jpg"); }
.lesson-96 .hero { background-image: url("lower-96.jpg"); }
.lesson-97 .hero { background-image: url("lower-97.jpg"); }
.lesson-98 .hero { background-image: url("lower-98.jpg"); }
.lesson-99 .hero { background-image: url("lower-99.jpg"); }
.lesson-100 .hero { background-image: url("lower-100.jpg"); }

/* Long titles remain legible within the quiet part of the handscroll. */
.lesson-75 .hero h1,
.lesson-81 .hero h1,
.lesson-87 .hero h1,
.lesson-90 .hero h1,
.lesson-91 .hero h1 { font-size: clamp(34px, 3.8vw, 56px); line-height: 1.28; }

@media (max-width: 700px) {
  .lesson-75 .hero h1,
  .lesson-81 .hero h1,
  .lesson-87 .hero h1,
  .lesson-90 .hero h1,
  .lesson-91 .hero h1 { font-size: clamp(29px, 7vw, 40px); }
}