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(max-width:850px){.course-hero{grid-template-columns:1fr;gap:40px;padding:50px 0}.course-cover{min-height:320px;transform:none}.course-facts{grid-template-columns:1fr 1fr}.course-section,.course-enroll{grid-template-columns:1fr;gap:30px;padding:50px 0}.classroom-layout{grid-template-columns:1fr}.lesson-sidebar{border-top:1px solid #ffffff20;border-right:0;order:2}.lesson-main{padding:28px 5%}.course-footer>span{display:none}.course-nav{height:72px}.lesson-actions{flex-wrap:wrap}.course-section h2,.course-enroll h2{font-size:36px}}.course-cover{min-height:500px;padding-top:230px;position:relative;overflow:hidden}.course-cover>img{object-fit:cover;width:100%;height:205px;position:absolute;top:0;left:0}.course-cover strong{margin:20px 0;font-size:clamp(40px,5vw,65px)}.course-cover>div{margin-top:12px}.course-return{text-underline-offset:5px;margin-top:25px;font-size:14px;display:block;text-decoration:underline!important}.course-preview-note{color:#d8edb5;background:#d8edb51a;flex-wrap:wrap;justify-content:space-between;gap:20px;padding:14px 5%;font-size:14px;display:flex}.course-preview-note a{text-decoration:underline}.course-test-note{color:#d8edb5;font-size:14px;line-height:1.6}.classroom .lesson-main{box-sizing:border-box;width:100%;max-width:100%;margin:0}.classroom-layout>*{min-width:0}.lesson-video video{object-fit:contain;max-width:100%;height:auto}@media (max-width:850px){.classroom-layout{grid-template-columns:minmax(0,1fr)}}.lesson-sidebar nav{width:100%;display:block}.lesson-sidebar details{width:100%}.lesson-sidebar{box-sizing:border-box}.classroom{overflow-x:clip}