.mobile-course-header{display:none;background-color:#181059;padding:15px 20px;position:fixed;top:85px;z-index:1001;border-bottom:1px solid rgba(255,255,255,.1)}.sidebar-toggle-btn{background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.2);color:#fff;padding:8px;border-radius:4px;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all .2s}.sidebar-toggle-btn .close-icon{display:none}.sidebar-toggle-btn.active .menu-icon{display:none}.sidebar-toggle-btn.active .close-icon{display:block}.sidebar-toggle-btn.active{background:var(--primary-color);border-color:var(--primary-color)}.sidebar{width:320px;background-color:#181059;color:var(--text-white);height:calc(100vh - 80px);position:sticky;top:80px;overflow-y:auto;border-right:1px solid rgba(255,255,255,.1);scrollbar-width:none;-ms-overflow-style:none;transition:transform .3s ease}.sidebar::-webkit-scrollbar{display:none}.sidebar-lesson a{padding:12px 20px 12px 30px;display:flex;align-items:center;gap:12px;color:rgba(255,255,255,.7);font-size:14px;transition:all .2s}.sidebar-lesson:hover a{color:#fff;background-color:rgba(255,255,255,.05)}.sidebar-lesson.active{background-color:rgba(59,130,246,.15);border-left:3px solid var(--primary-color)}.sidebar-lesson.active a{color:#fff;font-weight:600}.sidebar-explore-heading{padding:20px 20px 10px;font-size:16px;font-weight:700;text-transform:uppercase;letter-spacing:.1em;color:#fff;border-bottom:1px solid rgba(255,255,255,.08);margin-bottom:4px}@media (max-width:1024px){.mobile-course-header{display:flex;width:100%}.sidebar-container{position:fixed;top:0;left:0;right:0;bottom:0;z-index:1000;background:rgba(0,0,0,.5);transform:translateX(-100%);transition:transform .3s ease}.sidebar-container.open{transform:translateX(0)}.sidebar-container.open .sidebar{box-shadow:4px 0 20px rgba(0,0,0,.3)}.sidebar{padding-top:45px}}