.aibook-learning-routes-v2{
  --surface:#fff;
  --surface-soft:#f8fafb;
  --text:#1e2835;
  --muted:#5f6b78;
  --border:#dfe5ec;
  --link:#075e8f;
  width:100%;
  margin:24px 0 36px;
  border:1px solid var(--border);
  border-radius:6px;
  background:var(--surface);
  color:var(--text);
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Microsoft YaHei",sans-serif;
  font-size:16px;
  line-height:1.72;
  letter-spacing:0;
  overflow:hidden;
}
.aibook-learning-routes-v2,
.aibook-learning-routes-v2 *{box-sizing:border-box}
.aibook-learning-routes-v2 a{color:var(--link);text-decoration:none}
.aibook-learning-routes-v2 a:hover{text-decoration:underline;text-underline-offset:3px}
.aibook-learning-routes-v2 img{display:block;max-width:100%}
.aibook-learning-routes-v2 .page-hero{padding:46px 44px 30px;border-bottom:1px solid var(--border)}
.aibook-learning-routes-v2 .page-hero__eyebrow,
.aibook-learning-routes-v2 .section-label{display:block;margin:0 0 8px;color:#087aa2;font-size:13px;font-weight:750}
.aibook-learning-routes-v2 .page-hero h1{max-width:780px;margin:0;font-size:36px;line-height:1.26;font-weight:760}
.aibook-learning-routes-v2 .page-hero p{max-width:850px;margin:16px 0 0;color:var(--muted);font-size:16px}
.aibook-learning-routes-v2 .path-picker{padding:30px 44px 46px;border-bottom:1px solid var(--border)}
.aibook-learning-routes-v2 .path-picker h2{margin:0;font-size:24px;line-height:1.35}
.aibook-learning-routes-v2 .path-picker__intro{margin:8px 0 20px;color:var(--muted)}
.aibook-learning-routes-v2 .role-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}
.aibook-learning-routes-v2 .role-card{position:relative;display:flex;min-width:0;min-height:202px;flex-direction:column;padding:20px 20px 18px;border:1px solid var(--border);border-radius:6px;background:var(--surface);color:var(--text);overflow:hidden}
.aibook-learning-routes-v2 .role-card:hover{border-color:var(--accent);box-shadow:0 8px 20px rgba(31,45,61,.08);text-decoration:none}
.aibook-learning-routes-v2 .role-card__line{position:absolute;top:0;right:0;left:0;height:4px;background:var(--accent)}
.aibook-learning-routes-v2 .role-card strong{margin:4px 0 9px;color:var(--accent);font-size:19px;line-height:1.4}
.aibook-learning-routes-v2 .role-card__goal{min-height:56px;color:#475463;font-size:14px;line-height:1.65}
.aibook-learning-routes-v2 .role-card__effort{margin:10px 0 12px;color:#6a7682;font-size:13px}
.aibook-learning-routes-v2 .role-card__hint{align-self:flex-start;margin-top:auto;padding:3px 8px;border:1px solid var(--accent);border-radius:4px;background:var(--accent-soft);color:var(--accent);font-size:12px;line-height:1.5}
.aibook-learning-routes-v2 .legacy-anchor{display:block;height:1px;margin-top:-1px;overflow:hidden;scroll-margin-top:84px}
.aibook-learning-routes-v2 .role-section{padding:52px 44px 22px;border-bottom:1px solid var(--border);scroll-margin-top:84px}
.aibook-learning-routes-v2 .role-heading{display:grid;grid-template-columns:minmax(0,1.65fr) minmax(250px,.8fr);gap:36px;align-items:start}
.aibook-learning-routes-v2 .role-heading h2{margin:0;color:var(--accent);font-size:30px;line-height:1.32}
.aibook-learning-routes-v2 .role-goal{max-width:720px;margin:14px 0 0;color:#3f4c5a;font-size:16px}
.aibook-learning-routes-v2 .role-facts{margin:0;border-top:3px solid var(--accent)}
.aibook-learning-routes-v2 .role-facts div{padding:12px 0;border-bottom:1px solid var(--border)}
.aibook-learning-routes-v2 .role-facts dt{margin:0 0 3px;color:var(--accent);font-size:12px;font-weight:750}
.aibook-learning-routes-v2 .role-facts dd{margin:0;color:#4f5b68;font-size:13px;line-height:1.55}
.aibook-learning-routes-v2 .disclaimer{margin:22px 0 0;padding:12px 14px;border-left:4px solid var(--accent);background:var(--accent-soft);color:#4f5b68;font-size:13px}
.aibook-learning-routes-v2 .route-visual{margin:30px 0 14px}
.aibook-learning-routes-v2 .route-visual img{width:100%;height:auto;border-radius:6px}
.aibook-learning-routes-v2 .route-visual figcaption{margin-top:7px;color:#77818c;font-size:12px}
.aibook-learning-routes-v2 .stage-list{margin-top:22px;border-top:1px solid var(--border)}
.aibook-learning-routes-v2 .stage-row{display:grid;grid-template-columns:64px minmax(0,1.45fr) minmax(230px,.72fr);gap:22px;padding:30px 0;border-bottom:1px solid var(--border);scroll-margin-top:84px}
.aibook-learning-routes-v2 .stage-index{display:flex;flex-direction:column;align-items:flex-start}
.aibook-learning-routes-v2 .stage-index span{display:grid;place-items:center;width:48px;height:48px;border:1px solid var(--accent);border-radius:6px;background:var(--accent-soft);color:var(--accent);font-size:18px;font-weight:750}
.aibook-learning-routes-v2 .stage-index small{margin:5px 0 0 12px;color:#7a8590;font-size:11px}
.aibook-learning-routes-v2 .stage-main h3{margin:1px 0 8px;font-size:22px;line-height:1.38}
.aibook-learning-routes-v2 .stage-main>p{margin:0;color:#4f5b68}
.aibook-learning-routes-v2 .core-reads{margin-top:20px}
.aibook-learning-routes-v2 .core-reads h4,
.aibook-learning-routes-v2 .knowledge-blocks h4,
.aibook-learning-routes-v2 .checkpoint h4{margin:0 0 8px;color:#63707d;font-size:12px;font-weight:750}
.aibook-learning-routes-v2 .core-reads ul{margin:0;padding:0;list-style:none}
.aibook-learning-routes-v2 .core-reads li{display:grid;grid-template-columns:minmax(160px,.75fr) minmax(0,1.25fr);gap:14px;padding:9px 0;border-top:1px dashed #e1e6ec}
.aibook-learning-routes-v2 .core-reads li:first-child{border-top:0}
.aibook-learning-routes-v2 .core-reads a{font-weight:700}
.aibook-learning-routes-v2 .core-reads a::after,
.aibook-learning-routes-v2 .knowledge-links a::after{content:" ↗";font-size:.82em}
.aibook-learning-routes-v2 .core-reads span{color:#6a7580;font-size:13px}
.aibook-learning-routes-v2 .stage-aside{display:flex;flex-direction:column;gap:18px}
.aibook-learning-routes-v2 .knowledge-links{display:flex;flex-wrap:wrap;gap:7px}
.aibook-learning-routes-v2 .knowledge-links a{padding:4px 8px;border:1px solid var(--accent);border-radius:4px;background:var(--accent-soft);color:var(--accent);font-size:12px;font-weight:650}
.aibook-learning-routes-v2 .knowledge-links a:hover{text-decoration:none}
.aibook-learning-routes-v2 .checkpoint{margin-top:auto;padding:13px 14px;border-left:3px solid var(--accent);background:#f7f9fb}
.aibook-learning-routes-v2 .checkpoint h4{color:var(--accent)}
.aibook-learning-routes-v2 .checkpoint p{margin:0;color:#4f5b68;font-size:13px}
.aibook-learning-routes-v2 .next-routes{display:flex;flex-wrap:wrap;align-items:center;gap:10px;margin:28px 0 0;padding:18px 0;border-top:0 solid var(--border)}
.aibook-learning-routes-v2 .next-routes span{color:#697581;font-size:13px}
.aibook-learning-routes-v2 .next-routes>a:not(.back-link){padding:4px 9px;border:1px solid var(--border);border-radius:4px;background:#fff;font-size:13px}
.aibook-learning-routes-v2 .back-link{margin-left:auto;font-size:13px}
.aibook-learning-routes-v2 .page-footer{padding:40px 44px 50px}
.aibook-learning-routes-v2 .page-footer h2{margin:0 0 12px;font-size:25px}
.aibook-learning-routes-v2 .page-footer ul{margin:0 0 20px;padding-left:1.25rem;color:#4f5b68}
.aibook-learning-routes-v2 .page-footer__links{display:flex;gap:10px;flex-wrap:wrap}
.aibook-learning-routes-v2 .page-footer__links a{padding:7px 11px;border:1px solid var(--border);border-radius:4px;background:var(--surface)}
.aibook-learning-routes-v2.aibook-home-entry{margin:26px 0 38px;border:0;background:transparent;overflow:visible}
.aibook-learning-routes-v2 .home-entry__header{margin:0 0 20px}
.aibook-learning-routes-v2 .home-entry__header h2{margin:0 0 8px;font-size:28px;line-height:1.35}
.aibook-learning-routes-v2 .home-entry__header p{margin:0;color:var(--muted)}
@media(max-width:920px){
  .aibook-learning-routes-v2 .page-hero,
  .aibook-learning-routes-v2 .path-picker,
  .aibook-learning-routes-v2 .role-section,
  .aibook-learning-routes-v2 .page-footer{padding-left:28px;padding-right:28px}
  .aibook-learning-routes-v2 .role-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .aibook-learning-routes-v2 .role-heading{grid-template-columns:1fr}
  .aibook-learning-routes-v2 .stage-row{grid-template-columns:56px minmax(0,1fr)}
  .aibook-learning-routes-v2 .stage-aside{grid-column:2}
}
@media(max-width:620px){
  .aibook-learning-routes-v2{margin-right:-12px;margin-left:-12px;width:calc(100% + 24px);border-right:0;border-left:0;border-radius:0}
  .aibook-learning-routes-v2 .page-hero{padding:34px 18px 24px}
  .aibook-learning-routes-v2 .page-hero h1{font-size:30px}
  .aibook-learning-routes-v2 .page-hero p{font-size:15px}
  .aibook-learning-routes-v2 .path-picker,
  .aibook-learning-routes-v2 .role-section,
  .aibook-learning-routes-v2 .page-footer{padding-left:18px;padding-right:18px}
  .aibook-learning-routes-v2 .path-picker{padding-top:26px;padding-bottom:34px}
  .aibook-learning-routes-v2 .role-grid{grid-template-columns:1fr}
  .aibook-learning-routes-v2 .role-card{min-height:184px}
  .aibook-learning-routes-v2 .role-card__goal{min-height:auto}
  .aibook-learning-routes-v2 .role-section{padding-top:42px}
  .aibook-learning-routes-v2 .role-heading h2{font-size:27px}
  .aibook-learning-routes-v2 .role-goal{font-size:15px}
  .aibook-learning-routes-v2 .route-visual{margin-right:-18px;margin-left:-18px;overflow-x:auto;padding:0 18px 8px}
  .aibook-learning-routes-v2 .route-visual img{width:1000px;max-width:none}
  .aibook-learning-routes-v2 .route-visual figcaption{width:1000px}
  .aibook-learning-routes-v2 .stage-row{grid-template-columns:1fr;gap:13px;padding:27px 0}
  .aibook-learning-routes-v2 .stage-index{flex-direction:row;align-items:center;gap:8px}
  .aibook-learning-routes-v2 .stage-index span{width:42px;height:42px}
  .aibook-learning-routes-v2 .stage-index small{margin:0}
  .aibook-learning-routes-v2 .stage-main h3{font-size:20px}
  .aibook-learning-routes-v2 .stage-aside{grid-column:auto}
  .aibook-learning-routes-v2 .core-reads li{grid-template-columns:1fr;gap:2px}
  .aibook-learning-routes-v2 .back-link{width:100%;margin:8px 0 0}
  .aibook-learning-routes-v2.aibook-home-entry{margin-right:0;margin-left:0;width:100%}
  .aibook-learning-routes-v2 .home-entry__header h2{font-size:25px}
}