.course-select select{max-width:255px;min-height:35px;border:1px solid #d5def0;border-radius:6px;padding:6px 28px 6px 10px;background:#fff;color:#29436f;font:13px var(--sans)}.course-catalog{display:flex;flex-direction:column;gap:3px;border-bottom:1px solid var(--line);padding-bottom:16px;margin-bottom:18px}.course-home{font-size:13px;color:#315ddd;margin-bottom:10px}.course-catalog-label{font:10px var(--sans);letter-spacing:1px;color:#8c96a9;margin-bottom:5px}.course-route{font-size:12px;line-height:1.5;padding:7px 9px;border-radius:5px;color:#65718b}.course-route.active{background:#eaf0ff;color:#2e59ed;font-weight:600}.course-route:hover{background:#f1f4fc}.sidebar{overflow-y:auto}.intro-contact{font-size:13px;line-height:1.8;color:#66718a;margin-top:16px}.intro-transcript pre{white-space:pre-wrap;line-height:1.85;font:13px/1.85 var(--sans);max-height:300px;overflow:auto}.intro-chart{margin:20px 0 0}.intro-chart button{border:0;background:transparent;padding:0;width:100%;cursor:zoom-in}.intro-chart img{max-width:100%;width:100%;height:auto}.intro-chart button span,.intro-chart figcaption{display:block;text-align:center;color:#7a879f;font-size:11px;margin:6px 0}.intro-video{max-width:840px;margin:0 auto}.intro-video video{width:100%;border-radius:9px;background:#101a2a;max-height:390px}.intro-hours{display:flex;gap:80px;border-bottom:1px solid var(--line);padding:10px 0 28px;margin-bottom:24px}.intro-hours>div{display:flex;align-items:baseline;gap:14px}.intro-hours strong{font:600 72px var(--sans);color:#315ddd}.intro-hours span{font-size:16px;color:#69778f}.intro-questions{display:flex;gap:45px;padding:20px 0 25px;margin-bottom:18px;border-bottom:1px solid var(--line)}.intro-questions>div{display:flex;flex-direction:column;gap:8px}.intro-questions strong{color:#315ddd;font:600 46px var(--sans)}.intro-questions span{color:#66718a;font-size:15px}.intro-next{display:inline-block;color:#fff;background:#315ddd;padding:12px 24px;border-radius:6px;margin:20px 0}.exercise-original-heading{font-size:16px!important;margin:22px 0 14px}@media(max-width:1100px){.course-select select{max-width:200px}.brand-sub{display:none}}@media(max-width:650px){.course-select select{max-width:145px;font-size:11px;padding-left:7px}.topbar-tools{gap:5px}.brand strong{font-size:13px}.intro-hours{gap:35px}.intro-hours strong{font-size:50px}.intro-questions{gap:24px}.intro-questions strong{font-size:30px}.intro-questions span{font-size:12px}}@media print{.course-catalog,.course-select{display:none!important}}

/* Keep mode switching available throughout long reading pages. */
body.reading .topbar{position:sticky;top:0;z-index:50;box-shadow:0 2px 12px #17243d0d}
body.reading .stage-context{top:var(--course-toolbar-height,82px)}
body.reading .sidebar{top:var(--course-toolbar-height,82px);height:calc(100dvh - var(--course-toolbar-height,82px))}
body.reading .slide{scroll-margin-top:calc(var(--course-toolbar-height,82px) + 64px)}