/* Reuse the curriculum's type, colors, and navigation; scope index styles. */
.extra-help { margin: 0; }
.extra-help * { box-sizing: border-box; }
.extra-help [hidden] { display: none !important; }
.eh-wrap { max-width: 1180px; padding: 24px 32px 56px; margin: auto; }
.eh-header { border-bottom: 1px solid var(--course-border); padding-bottom: 24px; }
.eh-header h1 { font-size: clamp(2rem, 5vw, 3rem); line-height: 1.15; margin: 12px 0; }
.eh-lede { font-size: 1.2rem; max-width: 65ch; }
.eh-source, .eh-unit-count, .eh-alias, .eh-footer { color: var(--course-muted); }
.eh-back, .eh-footer a { display: inline-flex; align-items: center; min-height: 44px; color: var(--course-blue); }
.eh-filters { display: grid; grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr) auto; gap: 16px; align-items: start; margin: 24px 0 16px; }
.eh-filters label { display: block; font-weight: 700; margin-bottom: 6px; }
.eh-filters :is(input, select, button) { font: inherit; width: 100%; min-height: 48px; border: 1px solid var(--course-muted); border-radius: 6px; padding: 10px 12px; background: #fff; color: var(--course-ink); }
.eh-filters button { margin-top: 32px; cursor: pointer; font-weight: 700; }
.eh-filters p { margin: 6px 0 0; font-size: 1rem; color: var(--course-muted); }
.eh-jumps { display: flex; flex-wrap: wrap; gap: 8px; margin: 24px 0 16px; }
.eh-jumps a { display: inline-flex; align-items: center; min-height: 44px; padding: 8px 14px; border: 1px solid var(--course-muted); border-radius: 6px; background: #fff; color: var(--course-blue); font-weight: 700; text-decoration: none; }
.eh-unit { margin-top: 36px; scroll-margin-top: 16px; }
.eh-unit h2 { font-size: 1.5rem; line-height: 1.3; margin: 0 0 8px; }
.eh-unit-count { margin: 0 0 16px; }
.eh-lessons { list-style: none; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); padding: 0; margin: 0; gap: 16px; }
.eh-lesson { min-width: 0; background: #fff; border: 1px solid var(--course-border); border-radius: 8px; padding: 20px; display: flex; flex-direction: column; scroll-margin-top: 16px; }
.eh-number { margin: 0 0 6px; color: var(--course-teal); font-weight: 700; }
.eh-number span { display: inline-block; font-size: 1rem; color: var(--course-muted); font-weight: 400; margin-left: 8px; }
.eh-lesson h3 { font-size: 1.25rem; line-height: 1.35; margin: 0; }
.eh-alias { font-size: 1rem; margin: 8px 0 0; }
.eh-target { margin: 12px 0 20px; }
.eh-links { display: flex; flex-wrap: wrap; gap: 8px; margin-top: auto; }
.eh-links a { display: inline-flex; align-items: center; min-height: 44px; padding: 8px 12px; border: 1px solid var(--course-blue); border-radius: 6px; color: var(--course-blue); font-weight: 700; text-decoration: none; }
.eh-links a:first-child { background: var(--course-blue); color: #fff; }
.eh-links a:hover, .eh-jumps a:hover, .eh-filters button:hover { background: #eaf2fa; color: var(--course-ink); }
.eh-footer { margin-top: 40px; border-top: 1px solid var(--course-border); padding-top: 20px; }
.eh-sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }
@media (max-width: 700px) {
  .eh-wrap { padding: 20px 16px 40px; }
  .eh-filters, .eh-lessons { grid-template-columns: minmax(0, 1fr); }
  .eh-filters button { margin-top: 0; width: auto; justify-self: start; }
}
@media print {
  .extra-help .ewl-course-nav, .eh-filters, .eh-jumps, .eh-back { display: none !important; }
  .eh-wrap { padding: 0; }
  .eh-lesson { break-inside: avoid; }
}