.lesson-hero{padding:64px 0;background:linear-gradient(135deg,#fffdf8,#fff5df);border-bottom:1px solid #efe1c7}.lesson-hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:46px;align-items:center}.lesson-hero h1{font-size:clamp(2.6rem,5vw,4.6rem);line-height:.98;letter-spacing:-.045em;color:var(--navy2);margin:10px 0 18px}.lesson-lede{font-size:1.12rem;color:var(--muted);max-width:720px}.lesson-hero-grid>img{border-radius:26px;box-shadow:var(--shadow);width:100%;aspect-ratio:16/9;object-fit:cover}.lesson-meta{display:flex;flex-wrap:wrap;gap:9px;margin-top:22px}.lesson-meta span{display:inline-flex;align-items:center;background:#fff;border:1px solid var(--line);border-radius:999px;padding:8px 12px;font-size:.82rem;font-weight:900;color:var(--navy)}.lesson-section{background:#fbfcfe}.lesson-layout{display:grid;grid-template-columns:minmax(0,1fr) 330px;gap:34px;align-items:start}.lesson-main{min-width:0}.video-embed-wrap{position:relative;width:100%;aspect-ratio:16/9;border-radius:28px;overflow:hidden;background:#071d3a;box-shadow:var(--shadow)}.youtube-lesson-player{position:absolute;inset:0;width:100%;height:100%;border:0}.lesson-block{background:#fff;border:1px solid var(--line);border-radius:26px;padding:30px;margin-top:24px;box-shadow:var(--soft-shadow)}.lesson-block h2{color:var(--navy2);font-size:clamp(1.65rem,3vw,2.35rem);line-height:1.08;margin:8px 0 14px}.lesson-block p{color:#536173}.teaching-card{background:linear-gradient(145deg,#fff,#fff9ec)}.lesson-steps{padding-left:22px;margin:18px 0 0}.lesson-steps li{padding-left:5px;margin:13px 0;color:#536173}.lesson-steps strong{color:var(--navy)}.practice-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin-top:20px}.practice-grid>div{background:#f7fbff;border:1px solid #dfeaf6;border-radius:19px;padding:20px}.practice-grid strong{display:block;color:var(--pink);font-size:1.05rem}.practice-grid p{margin:8px 0 0;font-size:.95rem}.transcript-block details{border:0}.transcript-block summary{cursor:pointer;font-weight:900;color:var(--navy);font-size:1.08rem}.transcript-copy{margin-top:20px;padding-top:4px;border-top:1px solid var(--line)}.transcript-copy p{margin:16px 0}.lesson-sidebar{position:sticky;top:105px;display:grid;gap:18px}.lesson-side-card{background:#fff;border:1px solid var(--line);border-radius:24px;padding:24px;box-shadow:var(--soft-shadow)}.lesson-side-card h2,.lesson-side-card h3{color:var(--navy2);line-height:1.12;margin:8px 0 12px}.lesson-side-card p{color:var(--muted)}.primary-side-card{background:linear-gradient(145deg,#0a346c,#0e4a91);color:#fff;border:0}.primary-side-card .tag{color:#ffdf72}.primary-side-card h2{color:#fff}.primary-side-card p{color:#e4edfb}.primary-side-card .btn{width:100%;text-align:center}.lesson-side-card .text-link{display:inline-block;margin-top:6px}@media(max-width:900px){.lesson-hero-grid,.lesson-layout{grid-template-columns:1fr}.lesson-sidebar{position:static}.lesson-hero-grid>img{max-width:720px}.practice-grid{grid-template-columns:1fr}}@media(max-width:620px){.lesson-hero{padding:46px 0}.lesson-section{padding-top:54px}.lesson-block{padding:22px;border-radius:21px}.lesson-side-card{padding:22px}.lesson-meta{gap:7px}.lesson-meta span{font-size:.76rem}}