.mathcourse-card{border-radius:12px;padding:15px;background:#fff;box-shadow:0 2px 10px rgba(0,0,0,.08)}
.mathcourse-default-cover{height:150px;display:flex;align-items:center;justify-content:center;background:#4a90e2;color:white;font-size:20px;border-radius:10px}.mathcourse-cover{width:100%;border-radius:10px}.mathcourse-player{width:100%;max-width:900px}
.mc-course-player{width:100%;margin:0 auto}.mc-course-player__top{display:flex;justify-content:space-between;gap:24px;align-items:flex-end;margin:0 0 22px}.mc-course-player__top h1{margin:4px 0 0;font-size:28px;line-height:1.3}.mc-course-player__eyebrow{font-size:13px;color:#6b7280}.mc-course-player__progress{min-width:230px}.mc-course-player__progress span{font-size:13px;color:#6b7280}.mc-course-player__progress strong{display:block;font-size:14px;margin:4px 0 7px}.mc-course-player__progress>div{height:7px;background:#e9eef5;border-radius:99px;overflow:hidden}.mc-course-player__progress i{display:block;height:100%;background:#f59e0b;border-radius:99px}.mc-course-player__layout{display:grid;grid-template-columns:minmax(0,1fr) 360px;gap:20px;align-items:start}.mc-course-player__main{min-width:0;background:#fff;border:1px solid #e7ebf0;border-radius:16px;overflow:hidden}.mc-course-player__video{background:#111;line-height:0}.mc-course-player__video .mathcourse-player{display:block;width:100%;max-width:none;aspect-ratio:16/9;height:auto}.mc-course-player__lesson-head{display:flex;justify-content:space-between;gap:12px;padding:18px 20px}.mc-course-player__lesson-head span{font-size:12px;color:#7a8492}.mc-course-player__lesson-head h2{margin:5px 0 0;font-size:20px}.mc-course-player__lesson-head em{font-style:normal;color:#d97706;background:#fff7ed;border-radius:20px;padding:5px 10px;font-size:12px;height:max-content}.mc-course-player__sidebar{background:#fff;border:1px solid #e7ebf0;border-radius:16px;overflow:hidden;position:sticky;top:20px;max-height:calc(100vh - 40px);display:flex;flex-direction:column}.mc-course-player__sidebar-head{display:flex;justify-content:space-between;padding:17px 18px;border-bottom:1px solid #edf0f3}.mc-course-player__sidebar-head span{color:#7a8492;font-size:13px}.mc-course-player__topics{overflow:auto}.mc-course-player__topic h3{font-size:14px;margin:0;padding:14px 16px 9px}.mc-course-player__lessons{padding-bottom:7px}.mc-course-player__item{display:flex;align-items:center;gap:9px;padding:10px 15px;text-decoration:none;color:#303740;font-size:14px;border-left:3px solid transparent;transition:.15s}.mc-course-player__item:hover{background:#f7f9fb}.mc-course-player__item.is-active{background:#eef6ff;border-left-color:#2271b1;color:#145b92;font-weight:600}.mc-course-player__item.is-complete .mc-course-player__check{color:#16a34a}.mc-course-player__check{width:20px;text-align:center;flex:none;color:#9aa3ad}.mc-course-player__item>span:nth-child(2){min-width:0;flex:1}.mc-course-player__item small{flex:none;font-size:11px;color:#d97706}.mc-course-player__item.is-locked{color:#9aa1aa;cursor:not-allowed}.mc-course-player__empty{padding:80px 30px;text-align:center}.mc-course-player__empty strong{display:block;font-size:18px;margin-bottom:8px}.mc-course-player__empty span{color:#7a8492;font-size:14px}
@media(max-width:900px){.mc-course-player__layout{grid-template-columns:1fr}.mc-course-player__sidebar{position:static;max-height:none}.mc-course-player__topics{max-height:420px}.mc-course-player__top{align-items:flex-start;flex-direction:column}.mc-course-player__progress{width:100%}}
@media(max-width:600px){.mc-course-player__top h1{font-size:22px}.mc-course-player__layout{gap:12px}.mc-course-player__main,.mc-course-player__sidebar{border-radius:12px}.mc-course-player__lesson-head{padding:14px}.mc-course-player__item{padding:10px 11px;font-size:13px}}