.main-shell.is-learning .content-grid { grid-template-columns: minmax(0, 1fr); }
.main-shell.is-learning .side-column { display: none; }
.main-shell.is-learning .page-subtitle { max-width: 760px; }
.learn-check, .learn-practice { max-width: 960px; min-width: 0; }
.learn-panel { padding: clamp(20px, 3vw, 36px); background: var(--surface); border: 1px solid var(--line); }
.learn-panel[hidden], .learn-extras[hidden], #topicExtras[hidden] { display: none; }
.learn-panel h2, .learn-extras h2, .learn-practice h2 { margin: 0 0 14px; font: 600 clamp(21px, 2vw, 27px)/1.3 var(--font-display); letter-spacing: 0; }
.learn-panel h3 { font: 600 19px/1.35 var(--font-display); }
.learn-muted { color: var(--muted); }
.learn-meta { font-size: 13px; color: var(--text-soft); }
.learn-intro p { max-width: 690px; }
.learn-button { display: inline-flex; justify-content: center; align-items: center; min-height: 46px; padding: 11px 20px; border: 1px solid var(--red); background: var(--red-strong); color: #fff; font-weight: 600; cursor: pointer; line-height: 1.4; text-align: center; }
.learn-button:hover { background: var(--red); }
.learn-button.is-secondary { background: transparent; border-color: var(--line-strong); color: var(--text-soft); }
.learn-button.is-secondary:hover { background: var(--surface-3); border-color: var(--text-soft); }
.learn-button:disabled { opacity: .45; cursor: default; }
.learn-link { color: var(--text); text-decoration: underline; text-underline-offset: 4px; text-decoration-color: var(--line-strong); }
.learn-link:hover { text-decoration-color: var(--red); }
.bottom-nav.has-topic-test { container: topic-navigation / inline-size; width: 100%; align-self: stretch; grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr); gap: 8px; }
.has-topic-test .pager { padding-inline: 8px; letter-spacing: .025em; white-space: nowrap; }
.has-topic-test .pager-back { grid-column: 1; grid-row: 1; }
.has-topic-test .pager-next { grid-column: 3; grid-row: 1; }
.pager-topic { grid-column: 1 / -1; grid-row: 2; border: 1px solid var(--line-strong); background: var(--surface-2); color: var(--text); }
.pager-topic:hover { border-color: var(--text-soft); background: var(--surface-3); }
@container topic-navigation (min-width: 300px) {
  .pager-topic { grid-column: 2; grid-row: 1; }
}
.learn-setup, .learn-actions { display: flex; flex-wrap: wrap; gap: 12px; align-items: end; margin: 24px 0 16px; }
.learn-actions { align-items: center; }
.learn-label { display: flex; flex-direction: column; gap: 8px; color: var(--text-soft); font-size: 14px; }
.learn-select { max-width: 100%; min-height: 46px; border: 1px solid var(--line-strong); background: var(--surface-2); color: var(--text); padding: 10px 13px; font: inherit; border-radius: 0; }
.learn-select { min-width: 150px; }
.learn-select:focus-visible, .learn-review summary:focus-visible, .learn-sources summary:focus-visible { outline: 2px solid var(--focus); outline-offset: 3px; }
.learn-resume { padding: 16px 0 0; margin-top: 20px; border-top: 1px solid var(--line); }
.learn-resume p { margin: 0 0 10px; }
.learn-progress-heading { display: flex; justify-content: space-between; gap: 12px; font-size: 13px; margin-bottom: 10px; }
.learn-progress { display: block; appearance: none; width: 100%; height: 3px; border: none; background: var(--line); margin: 0 0 28px; }
.learn-progress::-webkit-progress-bar { background: var(--line); }
.learn-progress::-webkit-progress-value { background: var(--red); }
.learn-progress::-moz-progress-bar { background: var(--red); }
.learn-question { scroll-margin-top: 85px; }
.learn-options { display: grid; gap: 12px; margin: 24px 0 0; border: 0; padding: 0; min-width: 0; list-style: none; }
.learn-option { display: flex; align-items: start; gap: 13px; padding: 17px 18px; border: 1px solid var(--line-strong); background: var(--surface-2); cursor: pointer; line-height: 1.55; }
.learn-option input { flex: 0 0 auto; width: 18px; height: 18px; margin: 3px 0 0; accent-color: var(--red); }
.learn-option:has(input:checked) { border-color: var(--text-soft); background: var(--surface-3); }
.learn-option:has(input:focus-visible) { outline: 2px solid var(--focus); outline-offset: 3px; }
.learn-option-body { display: block; min-width: 0; flex: 1; }
.learn-option-text { display: block; }
.learn-option-explanation { display: block; margin-top: 12px; padding-top: 12px; border-top: 1px solid var(--line-strong); font-size: 14px; line-height: 1.65; color: var(--text-soft); }
.learn-answer-label { display: block; margin-bottom: 5px; font-size: 12px; line-height: 1.5; font-weight: 600; }
.learn-option.is-correct,
.learn-option.is-correct:has(input:checked) {
  border-color: #58d998;
  background: #143d2c;
  box-shadow: inset 4px 0 0 #58d998;
  color: #edfff4;
}
.learn-option.is-correct input { accent-color: #58d998; }
.learn-option.is-correct .learn-answer-label { color: #86ecb7; }
.learn-option.is-correct .learn-option-explanation { border-color: #386b50; color: #d8f4e3; }
.learn-option.is-wrong,
.learn-option.is-wrong:has(input:checked) {
  border-color: #f77981;
  background: var(--surface-2);
}
.learn-option.is-wrong input { accent-color: #f77981; }
.learn-option.is-wrong .learn-answer-label { color: #ffafb5; }
.learn-options:disabled .learn-option { cursor: default; }
.learn-options:disabled input { opacity: 1; }
.learn-answer-status { display: flex; align-items: center; gap: 8px; width: fit-content; margin: 18px 0 -8px; padding: 6px 11px; border: 1px solid var(--line-strong); color: var(--text-soft); font-size: 14px; scroll-margin-top: 85px; }
.learn-answer-status.is-correct { color: #86ecb7; background: #143d2c; border-color: #386b50; }
.learn-answer-status.is-wrong { color: #ffafb5; background: #3b1b20; border-color: #754047; }
.learn-answer-status:focus-visible { outline: 2px solid var(--focus); outline-offset: 3px; }
.learn-status-icon { font-size: 19px; line-height: 1; }
.learn-reread { display: block; width: fit-content; margin-top: 20px; font-size: 14px; line-height: 1.6; }
.learn-question-actions { margin-bottom: 0; }
.learn-pair-note { border-left: 2px solid var(--red); padding-left: 12px; color: var(--text-soft); margin-bottom: 22px; }
.learn-score { font: 600 clamp(42px, 6vw, 66px)/1.1 var(--font-display); margin: 25px 0 0; }
.learn-score + p { margin-top: 6px; }
.learn-section-scores { max-width: 590px; margin: 25px 0; }
.learn-section-scores > div { display: flex; justify-content: space-between; gap: 20px; border-bottom: 1px solid var(--line); padding: 10px 0; }
.learn-section-scores dd { margin: 0; white-space: nowrap; font-variant-numeric: tabular-nums; }
.learn-recommendations { margin: 28px 0; }
.learn-recommendations ul, .learn-error-list { padding-left: 19px; display: grid; gap: 13px; }
.learn-review-heading { margin-top: 32px; }
.learn-review { border-top: 1px solid var(--line); padding: 14px 0; }
.learn-review summary { cursor: pointer; line-height: 1.55; }
.learn-review-mark { display: inline-block; font-size: 12px; font-weight: 600; color: var(--muted); margin-right: 10px; }
.learn-review-mark.is-correct { color: #86ecb7; }
.learn-review-mark.is-wrong { color: #ffafb5; }
.learn-options-review { margin: 16px 0 6px; }
.learn-options-review .learn-option { cursor: default; }
.learn-home { margin: 22px 0 28px; padding: 22px 24px; border: 1px solid var(--line); border-left: 3px solid var(--red); background: var(--surface); }
.learn-home-title { font: 600 24px/1.25 var(--font-display); }
.learn-home-title:hover { color: var(--red); }
.learn-home > p { margin: 9px 0 14px; max-width: 620px; }
#topicExtras { min-width: 0; margin-top: 24px; }
.learn-extras { border-top: 1px solid var(--line); padding-top: 24px; }
.learn-confirm { padding: 8px 0; }
.learn-home-tasks { margin: 22px 0 28px; padding: 24px; border: 1px solid var(--line); background: var(--surface); }
.learn-home-tasks-heading { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 8px 20px; }
.learn-home-tasks h2 { font: 600 24px/1.3 var(--font-display); margin: 0; }
.learn-home-tasks > p { max-width: 620px; margin: 10px 0 18px; }
.learn-task-menu { gap: 16px; }
.learn-task-menu-arrow { font-size: 20px; line-height: 1; }
.learn-task-chips { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 17px; }
.learn-task-chip { border: 1px solid var(--line-strong); padding: 9px 12px; min-height: 42px; background: var(--surface-2); }
.learn-task-chip:hover { border-color: var(--red); }
.learn-task-grid { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
.learn-task-card { display: flex; flex-direction: column; height: 100%; padding: 22px; border: 1px solid var(--line); background: var(--surface); }
.learn-task-card:hover { border-color: var(--red); background: var(--surface-2); }
.learn-task-card h2 { font-size: 23px; margin-bottom: 8px; }
.learn-task-card p { margin: 0 0 20px; color: var(--muted); line-height: 1.6; }
.learn-task-card-footer { display: flex; justify-content: space-between; align-items: center; gap: 12px; margin-top: auto; }
.learn-task-card-arrow { color: var(--red); font-size: 22px; line-height: 1; }
.learn-back { display: inline-block; margin: 3px 0 25px; }
.learn-task-intro { margin-bottom: 24px; }
.learn-task-intro p { max-width: 690px; }
.learn-route { counter-reset: route; list-style: none; padding: 0; margin: 0; }
.learn-route li { counter-increment: route; position: relative; padding: 22px 20px 22px 65px; border-top: 1px solid var(--line); }
.learn-route li::before { content: counter(route, decimal-leading-zero); position: absolute; left: 8px; top: 22px; color: var(--red); font: 600 21px/1.35 var(--font-display); }
.learn-route-title { font: 600 23px/1.3 var(--font-display); }
.learn-route-title:hover { text-decoration: underline; text-underline-offset: 4px; }
.learn-route p { color: var(--text-soft); margin: 10px 0 0; max-width: 690px; line-height: 1.6; }
.learn-task-test { border: 1px solid var(--line); background: var(--surface); padding: 22px; margin-top: 25px; }
.learn-task-test h3 { font: 600 22px/1.3 var(--font-display); margin: 0 0 16px; }
@media (max-width: 700px) {
  .learn-panel { padding: 20px 16px; }
  .learn-option { padding: 14px 12px; }
  .learn-progress-heading { font-size: 12px; }
  .learn-setup { align-items: stretch; }
  .learn-setup > * { flex: 1 1 180px; }
  .learn-home, .learn-home-tasks { padding: 20px 16px; }
  .learn-task-menu { width: 100%; justify-content: space-between; }
  .learn-task-grid { grid-template-columns: minmax(0, 1fr); }
  .learn-route li { padding: 18px 0 18px 44px; }
  .learn-route li::before { left: 0; top: 19px; }
  .learn-route-title { font-size: 21px; }
}
@media (prefers-reduced-motion: reduce) {
  .learn-check *, .learn-extras * { scroll-behavior: auto; }
}