/* Chapter-based practice index. Activity content stays in its existing sources. */
.wing-practice { --wing-ground: #F5F3E8; --wing-tint: #547062; }
.wing-practice .publisher small { color: var(--wing-tint); }
.wing-practice .intro { padding: 30px 0 23px; }
.wing-practice .intro h1 { font-size: 42px; margin-bottom: 12px; color: var(--midnight); }
.wing-practice .intro p { font-size: 18px; max-width: 42em; color: var(--ink-2); margin: 0; }
.wing-practice .intro .weekly-note { font-size: 16px; line-height: 1.5; max-width: 40em; margin-top: 18px; padding: 12px 16px; background: var(--field); border: 1px solid var(--rule); border-left: 4px solid var(--wing-tint); border-radius: 4px; }
.wing-practice .intro .weekly-note strong { color: var(--midnight); }
.practice-layout { display: grid; grid-template-columns: 185px minmax(0, 1fr); gap: 44px; padding-top: 10px; }
.topics { padding-top: 28px; }
.topics p { font-size: 14px; font-weight: 700; margin-bottom: 10px; }
.topics a { display: block; padding: 7px 0; color: var(--ink-2); font-size: 14px; text-decoration: none; line-height: 1.4; }
.topics a:hover { color: var(--midnight); text-decoration: underline; }
.topics a b { color: var(--wing-tint); margin-right: 4px; }
.topics .explore { border-top: 1px solid var(--rule); margin-top: 23px; padding-top: 15px; }
.topics .explore a { color: var(--midnight); }
.practice-topic { scroll-margin-top: 20px; padding: 27px 0 18px; border-top: 1px solid var(--rule); }
.practice-topic:first-child { border-top: 0; }
.topic-heading { display: flex; align-items: center; justify-content: space-between; gap: 16px; margin-bottom: 16px; }
.practice-topic h2 { font-size: 26px; margin: 0; }
.chapter-number { font-size: 14px; font-weight: 700; color: var(--wing-tint); margin: 0 0 5px; }
.chapter-subject { font-size: 14px; color: var(--ink-2); margin: 7px 0 0; }
.chapter-link { font-size: 13px; white-space: nowrap; text-underline-offset: 4px; color: var(--wing-tint); }
.activities { display: grid; gap: 9px; }
.activity { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 18px; align-items: center; background: var(--field); border: 1px solid var(--rule); border-radius: 6px; padding: 15px 18px; color: var(--midnight); text-decoration: none; }
.activity:hover { border-color: var(--wing-tint); }
.activity strong { font-size: 17px; font-weight: 700; display: block; line-height: 1.35; }
.activity .desc { display: block; font-size: 14px; line-height: 1.45; color: var(--ink-2); margin-top: 4px; }
.kind { font-size: 12px; line-height: 1.4; color: #426050; background: #eaf0e7; padding: 4px 9px; border-radius: 3px; white-space: nowrap; }
.kind.quiz { color: #6d5437; background: #f2e9d5; }
.kind.puzzle { color: #5c5372; background: #ede8f1; }
#legacy-quizzes { border-top: 2px solid var(--rule); margin-top: 18px; padding-top: 32px; }
.legacy-group { margin-top: 22px; scroll-margin-top: 20px; }
.legacy-group h3 { font-size: 15px; font-weight: 700; color: var(--wing-tint); margin: 0 0 10px; }
.topics .nav-legacy { border-top: 1px solid var(--rule); margin-top: 8px; padding-top: 12px; }
.practice-legend { display: flex; gap: 24px; flex-wrap: wrap; font-size: 13px; color: var(--ink-2); border-top: 1px solid var(--rule); padding: 20px 0; margin-top: 12px; }
.practice-legend b { color: var(--ink); }
.back-top { font-size: 13px; }
@media (prefers-color-scheme: dark) {
  .wing-practice { --wing-ground: #29332E; --wing-tint: #A3C4B2; }
}
@media (max-width: 680px) {
  .wing-practice .wrap { padding: 0 20px; }
  .practice-layout { grid-template-columns: 1fr; gap: 0; }
  .topics { padding: 0 0 19px; border-bottom: 1px solid var(--rule); }
  .topics a { font-size: 13px; padding: 6px 0; }
  .topics .explore { display: none; }
  .wing-practice .intro { padding: 24px 0 20px; }
  .wing-practice .intro h1 { font-size: 35px; }
  .wing-practice .intro p { font-size: 16px; }
  .wing-practice .intro .weekly-note { font-size: 15px; padding: 10px 13px; }
  .topic-heading { align-items: flex-start; flex-direction: column; gap: 8px; }
  .practice-topic h2 { font-size: 24px; }
  .activity { padding: 13px; gap: 10px; }
  .activity strong { font-size: 16px; }
  .activity .desc { font-size: 13px; }
  .practice-legend { gap: 7px; flex-direction: column; }
}

/* chapter lists fold under their headings (Doug, 7 Oct 2026) */
.practice-topic.foldable { padding-bottom: 22px; }
.foldable .topic-heading { cursor: pointer; margin-bottom: 0; }
.foldable.is-open .topic-heading { margin-bottom: 16px; }
.fold-toggle { display: inline-flex; align-items: center; gap: 10px; flex: none; background: none; border: 1px solid var(--rule); border-radius: 999px; padding: 6px 12px 6px 14px; min-height: 36px; font: inherit; font-size: 13px; color: var(--ink-2); cursor: pointer; }
.fold-toggle:hover { border-color: var(--wing-tint); color: var(--midnight); }
.fold-chev { width: 8px; height: 8px; border-right: 2px solid var(--wing-tint); border-bottom: 2px solid var(--wing-tint); transform: rotate(45deg) translateY(-2px); transition: transform .15s; }
.is-open .fold-chev { transform: rotate(-135deg) translateY(-2px); }
.foldable .topic-heading > div:first-child { flex: 1 1 auto; }
@media (max-width: 680px) { .foldable .topic-heading { flex-direction: row; flex-wrap: wrap; align-items: center; } .foldable .topic-heading > div:first-child { flex: 1 1 100%; } .fold-toggle { margin-left: 0; } }