.learning-shell { padding-top: 28px; }
.learning-header { max-width: 760px; }
.learning-header h1 { font: 600 36px/1.3 var(--sans); letter-spacing: -1px; margin: 10px 0 16px; color: var(--heading); }
.learning-header h1 span { color: var(--accent); }
.learning-header > p:not(.eyebrow) { color: var(--muted); font-size: 16px; }
.learning-meta { display: flex; flex-wrap: wrap; gap: 8px 20px; margin-top: 20px; font-size: 13px; color: var(--muted); }
.learning-scope { font-size: 13px; line-height: 1.8; margin: 24px 0 30px; color: var(--muted); }
.learning-topline { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 8px 18px; align-items: center; margin-bottom: 18px; font-size: 12px; color: var(--muted); }
.learning-topline p { margin: 0; }
.learning-topline > span { color: var(--heading); font-variant-numeric: tabular-nums; }
.learning-layout { display: grid; grid-template-columns: minmax(0, 1fr) 280px; gap: 30px; align-items: start; }
.learning-tracks { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 28px; }
.learning-track { min-width: 0; }
.learning-track h2 { font-size: 17px; font-weight: 600; color: var(--heading); margin: 0 0 6px; }
.learning-track > p { font-size: 12px; line-height: 1.7; margin: 0 0 20px; color: var(--muted); min-height: 40px; }
.learning-graph { position: relative; display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); grid-template-rows: repeat(5, minmax(90px, auto)); column-gap: 16px; row-gap: 34px; align-items: stretch; }
.learning-lines { position: absolute; inset: 0; width: 100%; height: 100%; pointer-events: none; overflow: visible; }
.learning-edge { fill: none; stroke: var(--line); stroke-width: 1.4; }
.learning-edge.is-related { stroke: var(--accent); stroke-width: 1.8; }
.learning-node { z-index: 1; min-width: 0; display: flex; flex-direction: column; justify-content: center; gap: 10px; padding: 12px; background: var(--surface); border: 1px solid var(--line); border-radius: 7px; text-decoration: none; color: var(--ink); overflow-wrap: anywhere; }
.learning-node strong { font-size: 14px; line-height: 1.5; font-weight: 500; }
.learning-node-meta { display: flex; flex-wrap: wrap; gap: 4px 8px; justify-content: space-between; font-size: 11px; color: var(--muted); }
.learning-node.is-pending { border-style: dashed; }
.learning-node.is-related { border-color: var(--accent); }
.learning-node.is-selected, .learning-node:hover { background: var(--accent-soft); border-color: var(--accent); }
.learning-reviewed { font-size: 11px; color: var(--accent); }
.learning-reviewed[hidden] { display: none; }
.learning-interactive { display: none; }
.is-enhanced .learning-interactive { display: block; }
.learning-detail { min-width: 0; position: sticky; top: 88px; padding: 22px; background: var(--summary); border: 1px solid var(--line); border-radius: 8px; scroll-margin-top: 88px; }
.learning-detail-heading { display: flex; flex-wrap: wrap; gap: 8px; justify-content: space-between; font-size: 11px; color: var(--muted); }
.learning-detail-heading > span { color: var(--heading); }
.learning-detail h2 { font-size: 21px; line-height: 1.5; font-weight: 600; margin: 15px 0 12px; color: var(--heading); }
.learning-back-to-map { display: none; color: var(--accent); font-size: 13px; margin-bottom: 18px; }
.learning-detail p { font-size: 13px; line-height: 1.85; margin: 0; overflow-wrap: anywhere; }
.learning-detail-block { margin-top: 22px; }
.learning-detail-block h3 { font-size: 12px; color: var(--muted); margin: 0 0 8px; font-weight: 500; }
.learning-article-links { display: grid; gap: 10px; }
.learning-article-links a { color: var(--accent); font-size: 13px; line-height: 1.8; text-decoration: underline; text-underline-offset: 3px; overflow-wrap: anywhere; }
.learning-article-links p { color: var(--muted); }
.learning-review { display: flex; align-items: center; gap: 9px; margin-top: 18px; min-height: 44px; font-size: 13px; }
.learning-review input { width: 18px; height: 18px; flex: none; accent-color: var(--accent); }
.learning-detail .learning-storage { margin-top: 12px; font-size: 11px; color: var(--muted); }
.learning-evidence { margin-top: 20px; color: var(--muted); }
.learning-evidence summary { font-size: 11px; min-height: 28px; }
.learning-evidence p { font-size: 11px; padding-top: 8px; }
.learning-all { margin: 32px 0 38px; border-top: 1px solid var(--line); padding-top: 18px; }
.learning-all > summary { font-size: 13px; color: var(--accent); padding: 6px 0; }
.learning-all section { padding: 22px 0; border-bottom: 1px solid var(--line); scroll-margin-top: 88px; }
.learning-all h3 { font-size: 18px; color: var(--heading); }
.learning-all p { font-size: 14px; line-height: 1.85; }
.learning-section-heading h2 { font-size: 25px; color: var(--heading); margin: 10px 0; }
.learning-history > p { color: var(--muted); font-size: 13px; line-height: 1.85; }
.learning-history ol { list-style: none; padding: 0; margin: 24px 0 0; }
.learning-history li { display: grid; grid-template-columns: 32px minmax(0, 1fr); gap: 18px; padding: 20px 0; border-top: 1px solid var(--line); }
.learning-event-number { font-family: var(--mono); color: var(--accent); font-size: 13px; padding-top: 3px; }
.learning-history time { color: var(--muted); font-size: 12px; }
.learning-history h3 { color: var(--heading); font-size: 17px; margin: 10px 0 6px; }
.learning-history li p { font-size: 14px; line-height: 1.8; margin: 0 0 10px; }
.learning-history li a, .learning-pending-text { font-size: 13px; color: var(--accent); line-height: 1.8; overflow-wrap: anywhere; }
.learning-history li a { text-decoration: underline; text-underline-offset: 3px; }
.learning-pending-text { color: var(--muted); }
@media (max-width: 1080px) {
  .learning-layout { grid-template-columns: minmax(0, 1fr) 250px; gap: 22px; }
  .learning-tracks { gap: 18px; }
  .learning-node { padding: 10px; }
  .learning-graph { column-gap: 12px; }
}
@media (max-width: 900px) {
  .learning-layout { grid-template-columns: minmax(0, 1fr); }
  .learning-detail { position: static; padding: 20px; }
  .learning-back-to-map { display: block; }
  .learning-track > p { min-height: 0; }
}
@media (max-width: 560px) {
  .learning-header h1 { font-size: 29px; }
  .learning-tracks { grid-template-columns: minmax(0, 1fr); gap: 34px; }
  .learning-graph { grid-template-rows: repeat(5, minmax(88px, auto)); column-gap: 16px; }
  .learning-node strong { font-size: 15px; }
  .learning-history li { gap: 12px; }
}