.CourseNav_nav__IyGve{display:flex;flex-direction:column;gap:14px;border:1px solid var(--line-2);background:var(--panel);padding:16px 14px}.CourseNav_railHead__4nt9A{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:0 4px 12px;border-bottom:1px solid var(--line)}.CourseNav_railTitle__D6CX_{font-family:var(--mono);font-size:12px;letter-spacing:.16em;text-transform:uppercase;color:var(--emerald)}.CourseNav_mobileToggle__n6nl3{display:none;font-family:var(--mono);font-size:11px;letter-spacing:.1em;text-transform:uppercase;color:var(--dim);background:none;border:1px solid var(--line-3);padding:5px 10px;cursor:pointer}.CourseNav_groups__pThjO{margin:0;padding:0;list-style:none;gap:2px}.CourseNav_group__WzvXt,.CourseNav_groups__pThjO{display:flex;flex-direction:column}.CourseNav_chapterBtn__lqll_{display:flex;align-items:center;gap:8px;width:100%;padding:8px 6px;background:none;border:none;text-align:left;cursor:pointer;color:var(--muted-2);transition:color .15s ease}.CourseNav_chapterBtn__lqll_:hover{color:var(--ink)}.CourseNav_chevron__K9Ead{flex-shrink:0;color:var(--faint);transition:transform .15s ease}.CourseNav_chevronOpen__WcGC_{transform:rotate(90deg)}.CourseNav_chapterNum__4YWEH{flex-shrink:0;font-family:var(--mono);font-size:11px;color:var(--dim)}.CourseNav_chapterTitle__K7sHL{flex:1;min-width:0;font-family:var(--sans);font-size:13px;font-weight:600;line-height:1.3}.CourseNav_lock__5zWxz{flex-shrink:0;color:var(--faint)}.CourseNav_lessons__etnit{padding:0 0 0 8px;list-style:none;display:flex;flex-direction:column;gap:1px;border-left:1px solid var(--line);margin:0 0 4px 12px}.CourseNav_lessonLink__Mryje{display:flex;align-items:center;gap:8px;padding:6px 8px;color:var(--muted);transition:color .15s ease,background .15s ease}.CourseNav_lessonLink__Mryje:hover{color:var(--ink);background:var(--emerald-fill)}.CourseNav_lessonActive__Xm5dn{color:var(--emerald);background:var(--emerald-fill)}.CourseNav_tick__tGyj3{flex-shrink:0;display:inline-flex;align-items:center;justify-content:center;width:14px;height:14px;color:var(--emerald)}.CourseNav_dot__QkHrJ{width:5px;height:5px;border-radius:0;background:var(--faint-3)}.CourseNav_lessonActive__Xm5dn .CourseNav_dot__QkHrJ{background:var(--emerald)}.CourseNav_lessonText__mgP6Y{font-family:var(--sans);font-size:13px;line-height:1.35}.CourseNav_arriving__hY_Lt{padding:6px 8px;font-family:var(--mono);font-size:11px;color:var(--faint)}@media (max-width:900px){.CourseNav_mobileToggle__n6nl3{display:inline-block}.CourseNav_groups__pThjO{display:none}.CourseNav_groupsOpen__JWqW7{display:flex}}