.lesson-breadcrumbs{display:flex;align-items:center;flex-wrap:wrap;gap:14px;padding-top:60px;font-size:12px;line-height:1.7;color:var(--text-secondary)}
.lesson-breadcrumbs a{min-height:32px;display:inline-flex;align-items:center}.lesson-breadcrumbs a:hover{color:white}
.lesson-heading{padding:32px 0 35px;max-width:860px}.lesson-heading .eyebrow{margin-bottom:18px;font-size:12px}.lesson-heading h1{font-size:clamp(37px,4.3vw,56px);font-weight:450;line-height:1.12;letter-spacing:-2.5px}.lesson-heading>p:last-child{margin-top:22px;color:var(--text-secondary);font-size:16px;line-height:1.8;max-width:690px}
.lesson-detail-layout{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:35px;align-items:start}.lesson-main{min-width:0}
.lesson-player{border:1px solid var(--line);border-radius:14px;overflow:hidden;background:var(--surface-card);aspect-ratio:16/9}.lesson-player video,.lesson-player iframe{width:100%;height:100%;display:block;border:0;background:#000}
.lesson-loading{height:100%;display:flex;align-items:center;justify-content:center;color:var(--text-secondary);font-size:14px}
.lesson-placeholder{height:100%;position:relative;padding:25px;background:#000}.lesson-placeholder img{width:100%;height:100%;object-fit:contain;opacity:.55}.lesson-placeholder-label{position:absolute;inset:auto 0 0;padding:28px 24px;background:linear-gradient(transparent,rgba(0,0,0,.95));text-align:center}.lesson-placeholder-label p{font-size:18px;font-weight:450}.lesson-placeholder-label span{display:block;margin-top:9px;color:var(--text-secondary);font-size:12px}
.lesson-description-section{padding:36px 0 33px}.lesson-description-section h2{font-size:25px;letter-spacing:-.8px}.lesson-description-section ul{padding-left:20px;margin:22px 0 0;color:var(--text-body);font-size:14px;line-height:1.9}.lesson-description-section li+li{margin-top:9px}
.lesson-sidebar{border:1px solid var(--line);border-radius:14px;background:var(--surface-card);padding:22px;position:sticky;top:160px;max-height:calc(100svh - 185px);overflow:auto;overscroll-behavior:contain;scrollbar-width:thin}
.lesson-sidebar h2{font-size:18px;letter-spacing:-.4px;line-height:1.4}.course-filter{margin-top:21px}.course-filter label{display:block;font-size:11px;color:var(--text-secondary);margin-bottom:9px}.course-filter select{height:44px;font-size:12px}
.course-index{list-style:none;margin:18px -9px -9px;padding:0}.course-index li+li{margin-top:4px}.course-link{display:flex;gap:12px;align-items:flex-start;min-height:65px;padding:12px 10px;border-radius:7px;border:1px solid transparent}.course-link:hover{background:var(--surface-raised)}.course-link[aria-current=page]{background:var(--surface-raised);border-color:var(--line-hover)}.course-number{color:var(--text-secondary);font-size:11px;line-height:1.6;padding-top:1px;flex-shrink:0;font-variant-numeric:tabular-nums}.course-link[aria-current=page] .course-number{color:var(--accent)}.course-copy{display:flex;flex-direction:column;gap:5px;min-width:0}.course-title{font-size:12px;line-height:1.5;color:var(--text-body)}.course-meta{font-size:10px;line-height:1.5;color:var(--text-secondary)}
.lesson-pager{display:grid;grid-template-columns:1fr 1fr;gap:16px;border-top:1px solid var(--line);padding-top:26px}.lesson-pager-link{display:flex;flex-direction:column;gap:12px;padding:20px;border:1px solid var(--line);border-radius:10px;min-height:108px;height:100%}.lesson-pager-link:hover{background:var(--surface-card);border-color:var(--line-hover)}.lesson-pager-link>span{font-size:11px;color:var(--text-secondary)}.lesson-pager-link strong{font-weight:450;font-size:14px;line-height:1.6}.lesson-pager-link.is-unavailable{color:var(--text-secondary);border-color:transparent}.lesson-pager-link.is-unavailable:hover{background:transparent}
.lesson-back{display:inline-flex;align-items:center;min-height:44px;font-size:12px;color:var(--text-secondary);margin-top:22px}.lesson-back:hover{color:white}.other-lessons{margin:95px 0 90px;border-top:1px solid var(--line);padding-top:35px}.other-lessons .library-heading{margin:0 0 28px}.other-lessons .library-heading h2{font-size:32px;letter-spacing:-1.2px}.other-lessons .library-heading>a{font-size:12px;color:var(--text-secondary);min-height:44px;display:flex;align-items:center;gap:14px}.other-lessons .library-heading>a:hover{color:white}.lesson-noscript{color:var(--text-secondary);line-height:1.8;font-size:14px;margin-bottom:30px}.lesson-noscript a{text-decoration:underline;text-underline-offset:4px}
.course-title{font-size:13px}.course-meta,.course-number{font-size:12px}
@media(max-width:1000px){.lesson-detail-layout{grid-template-columns:minmax(0,1fr) 270px;gap:24px}.lesson-sidebar{padding:19px}.other-lessons .lesson-grid{grid-template-columns:repeat(3,minmax(0,1fr))}.other-lessons .lesson-card-copy{padding:18px}.other-lessons .lesson-card h3{font-size:17px}}
@media(max-width:800px){.lesson-breadcrumbs{padding-top:48px}.lesson-heading{padding-top:24px}.lesson-heading h1{font-size:45px;letter-spacing:-2px}.lesson-detail-layout{grid-template-columns:1fr;gap:38px}.lesson-sidebar{position:static;max-height:none}.course-index{display:grid;grid-template-columns:1fr 1fr;gap:4px 15px}.course-index li+li{margin-top:0}.course-filter{max-width:310px}.course-title{font-size:13px}.course-meta{font-size:11px}.other-lessons{margin-top:68px;margin-bottom:65px}.other-lessons .lesson-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.other-lessons .lesson-card-copy{padding:21px}}
@media(max-width:540px){.lesson-breadcrumbs{padding-top:39px;font-size:11px;gap:12px}.lesson-heading{padding:24px 0 27px}.lesson-heading h1{font-size:35px;letter-spacing:-1.4px}.lesson-heading>p:last-child{font-size:14px;line-height:1.8;margin-top:18px}.lesson-player{border-radius:10px}.lesson-description-section{padding:28px 0}.lesson-description-section h2{font-size:23px}.lesson-description-section ul{font-size:14px;margin-top:19px}.lesson-pager{grid-template-columns:1fr;gap:12px;padding-top:22px}.lesson-pager-link{min-height:94px;padding:19px}.lesson-pager-link.is-unavailable{min-height:0;padding-top:0;padding-bottom:8px}.lesson-sidebar{padding:22px}.course-index{grid-template-columns:1fr;gap:0}.course-title{font-size:14px}.course-number{font-size:12px}.course-link{min-height:70px}.course-filter{max-width:none}.course-filter select{font-size:13px}.course-filter label{font-size:12px}.course-meta{font-size:12px}.other-lessons{margin:58px 0}.other-lessons .library-heading{display:flex;align-items:center;gap:18px}.other-lessons .library-heading h2{font-size:28px}.other-lessons .lesson-grid{grid-template-columns:1fr}.other-lessons .lesson-card h3{font-size:21px}.lesson-placeholder{padding:14px}.lesson-placeholder-label{padding:20px 15px}.lesson-placeholder-label p{font-size:16px}}