.igcse-back { display: inline-block; margin: 0 0 1rem; color: #155e88; font-weight: 750; text-decoration: none; }
.igcse-back:hover { text-decoration: underline; }
.igcse-source-note { margin: -.25rem 0 1.1rem; color: #365b76; }
.igcse-source-note a { color: #155e88; font-weight: 750; }
.igcse-chapter { border-bottom: 1px solid #e3edf5; }
.igcse-chapter:last-child { border-bottom: 0; }
.igcse-chapter summary { cursor: pointer; list-style: none; }
.igcse-chapter summary::-webkit-details-marker { display: none; }
.igcse-chapter summary:hover, .igcse-chapter summary:focus-visible, .igcse-chapter[open] summary { color: #0b6591; background: #eaf7fd; }
.igcse-chapter summary:focus-visible { outline: 3px solid #0a9aca; outline-offset: -3px; }
.igcse-chapter[open] .simple-topic-action span { display: inline-block; transform: rotate(180deg); }
.igcse-lessons { padding: .2rem 1.25rem .8rem 5.15rem; background: #f7fbfe; }
.igcse-lessons a, .igcse-unavailable { display: flex; align-items: center; justify-content: space-between; gap: 1rem; min-height: 3.15rem; padding: .55rem .8rem; border-bottom: 1px solid #e4eef5; color: #173b60; font-weight: 650; text-decoration: none; }
.igcse-lessons a:last-child, .igcse-unavailable:last-child { border-bottom: 0; }
.igcse-lessons a:hover, .igcse-lessons a:focus-visible { color: #075f87; background: #e4f4fb; }
.igcse-lessons a:focus-visible { outline: 3px solid #0a9aca; outline-offset: -3px; }
.igcse-lessons a span { color: #157ca8; font-size: 1.15rem; }
.igcse-unavailable { color: #718594; }
.igcse-unavailable small { flex: 0 0 auto; font-size: .78rem; font-weight: 650; }
@media (max-width: 700px) {
  .igcse-lessons { padding: .2rem .65rem .65rem; }
  .igcse-unavailable { align-items: flex-start; flex-direction: column; gap: .25rem; }
}