/* Course catalogs share the classroom palette and card language. */
.series-shell .site-header { margin-bottom: 30px; }
.series-hero {
  position: relative;
  max-width: none;
  min-height: 228px;
  margin: 0 0 42px;
  padding: 48px 54px;
  overflow: hidden;
  border: 1px solid #dfe9dd;
  border-radius: 24px;
  background: linear-gradient(115deg, #edf5ed, #f7f8ef);
  text-align: left;
}
.series-hero::after {
  position: absolute;
  right: 9%;
  bottom: -78px;
  width: 255px;
  height: 255px;
  border: 32px solid #dcebdc;
  border-radius: 50%;
  content: "";
  pointer-events: none;
}
.series-kicker { position: relative; margin-bottom: 16px; color: #638f6c; font-size: 11px; letter-spacing: .15em; }
.series-hero h1 { position: relative; max-width: 760px; font-size: clamp(30px, 3.8vw, 43px); line-height: 1.25; letter-spacing: -.03em; }
.series-hero > p:last-child { position: relative; max-width: 700px; margin-top: 14px; color: #748779; font-size: 15px; }
.catalog-heading { display: flex; align-items: end; justify-content: space-between; gap: 16px; margin-bottom: 20px; }
.catalog-heading p { margin: 0 0 8px; color: #8ba38e; font-size: 10px; font-weight: 700; letter-spacing: .14em; }
.catalog-heading h2 { margin: 0; color: #283c33; font-size: 22px; }
.catalog-heading > span { color: #8a9b89; font-size: 12px; }
.series-cards { grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 20px; }
.series-card, .course-card { position: relative; overflow: hidden; border: 1px solid #e7eae2; border-radius: 20px; background: #fff; }
.series-card { display: flex; min-height: 290px; flex-direction: column; padding: 27px; }
.series-card::before { position: absolute; inset: 0 0 auto; height: 7px; background: #a7c6a8; content: ""; }
.series-card-e::before { background: #e7c29b; }
.series-card-f::before { background: #b8c9d1; }
.series-code, .series-card-e .series-code, .series-card-f .series-code { width: 48px; height: 48px; border-radius: 15px; background: #edf5ef; color: #315c43; }
.series-card-e .series-code { background: #fcf1e6; color: #a6744d; }
.series-card-f .series-code { background: #edf3f4; color: #66828b; }
.series-card h2 { margin: 22px 0 5px; font-size: 23px; }
.series-card p { color: #7b887f; font-size: 14px; }
.series-enter { display: inline-flex; align-items: center; align-self: flex-start; gap: 10px; margin-top: auto; padding-top: 24px; color: #315c43; }
.series-enter b { transition: transform .18s ease; }
.series-card:hover .series-enter b, .series-card:focus-visible .series-enter b { transform: translateX(4px); }
.series-course-shell .back-home { margin-bottom: 20px; color: #63816b; }
.series-course-hero { min-height: 200px; }
.series-course-hero .series-kicker { display: inline-block; padding: 6px 10px; border-radius: 8px; background: #fff; }
.course-cards { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 20px; }
.course-card { display: flex; min-height: 220px; flex-direction: column; padding: 29px; }
.course-card::before { display: block; width: 40px; height: 40px; margin-bottom: 20px; border-radius: 13px; background: #edf5ef; color: #638f6c; content: "✦"; font-size: 20px; line-height: 40px; text-align: center; }
.course-card p { color: #79957d; font-size: 11px; letter-spacing: .06em; }
.course-card h3 { margin: 10px 0 20px; color: #283c33; font-size: 19px; }
.course-card span { margin-top: auto; color: #315c43; font-size: 13px; font-weight: 700; }
@media (max-width: 850px) { .series-cards { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 760px) {
  .series-shell .site-header { margin-bottom: 20px; }
  .series-hero { min-height: 0; margin-bottom: 32px; padding: 34px 25px; }
  .series-hero::after { right: -55px; bottom: -92px; width: 180px; height: 180px; border-width: 25px; opacity: .65; }
  .series-hero h1 { max-width: 90%; }
  .series-hero > p:last-child { max-width: 86%; font-size: 14px; }
  .catalog-heading > span { display: none; }
  .series-cards, .course-cards { grid-template-columns: 1fr; gap: 14px; }
  .series-card { min-height: 225px; padding: 24px; }
  .course-card { min-height: 200px; padding: 24px; }
}
@media (prefers-reduced-motion: reduce) { .series-enter b { transition: none; } }