.lesson-link{color:var(--text,#102a43);text-decoration:none;border:1px solid transparent;transition:background-color .18s,border-color .18s,transform .18s}
.lesson-link:hover{color:var(--primary,#1769e0);background:#f4f8ff;border-color:#d7e5fb;transform:translateX(3px)}
.lesson-arrow{margin-left:auto;font-size:1.3rem;color:#1769e0;opacity:.75}
.lesson-page-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:18px;color:#60738a}.lesson-page-head a{font-weight:700;text-decoration:none}
.lesson-layout{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:22px;align-items:start}
.lesson-content,.lesson-aside{background:#fff;border:1px solid #dfe7f1;border-radius:16px;box-shadow:0 8px 30px rgba(24,55,90,.06)}
.lesson-title{padding:28px 30px 22px}.lesson-title h1{font-size:1.8rem;margin:12px 0 8px;color:#102a43}.lesson-title p{color:#60738a}
.lesson-badge{display:inline-flex;padding:6px 11px;border-radius:999px;background:#e7f0ff;color:#1769e0;font-size:.78rem;font-weight:800}
.lesson-meta{display:flex;flex-wrap:wrap;gap:16px;color:#52677f;font-size:.9rem;margin-top:16px}
.video-frame{background:#071525;padding:18px}.video-frame video{display:block;width:100%;max-height:68vh;background:#000;border-radius:10px}
.reading-content{padding:28px 30px;min-height:330px;border-top:1px solid #e6edf5;line-height:1.75}.reading-content h2{font-size:1.25rem;margin-bottom:18px}
.practice-note{margin-top:25px;padding:18px;border-left:4px solid #1595a8;background:#effbfc;border-radius:8px}
.lesson-image{display:block;max-width:100%;max-height:70vh;margin:0 auto;padding:20px}.document-frame{width:100%;height:70vh;border:0;border-top:1px solid #e6edf5}
.download-box,.lesson-finish{display:flex;gap:20px;align-items:center;justify-content:space-between;padding:26px 30px;border-top:1px solid #e6edf5}.download-box p,.lesson-finish p{margin:4px 0 0;color:#60738a}
.lesson-aside{padding:24px;position:sticky;top:18px}.lesson-aside h3{font-size:1.15rem;margin:8px 0}.lesson-aside p{color:#60738a;font-size:.9rem}.lesson-aside>div{display:flex;justify-content:space-between;margin:13px 0}.lesson-aside small{color:#60738a}.eyebrow{font-size:.75rem;font-weight:800;letter-spacing:.12em;color:#1769e0}
#heartbeatToken{display:none}
@media(max-width:1000px){.lesson-layout{grid-template-columns:1fr}.lesson-aside{position:static;order:-1}}
@media(max-width:640px){.lesson-title,.reading-content,.download-box,.lesson-finish{padding:20px}.lesson-finish,.download-box{align-items:flex-start;flex-direction:column}.lesson-page-head span{display:none}}