.course-nav-wrapper{position:sticky;top:60px;z-index:9998;background:linear-gradient(135deg,rgb(43 92 137/37%) 0%,#fff 62%);backdrop-filter:blur(10px);border-bottom:1px solid rgba(0,0,0,.08);box-shadow:0 4px 20px rgba(0,0,0,.08);padding:12px 0}.course-nav-container{display:flex;gap:8px;overflow-x:auto;scroll-behavior:smooth;padding-bottom:8px;justify-content:center}.course-nav-container::-webkit-scrollbar{height:4px}.course-nav-container::-webkit-scrollbar-track{background:rgba(0,0,0,.05);border-radius:10px}.course-nav-container::-webkit-scrollbar-thumb{background:rgba(0,0,0,.15);border-radius:10px;transition:background .3s ease}.course-nav-container::-webkit-scrollbar-thumb:hover{background:rgba(0,0,0,.25)}.course-nav-item{padding:8px 16px;border-radius:20px;background:rgba(255,255,255,.6);border:1px solid rgba(0,0,0,.1);color:#333;font-size:14px;font-weight:500;cursor:pointer;white-space:nowrap;text-decoration:none;transition:all .3s cubic-bezier(.4,0,.2,1);flex-shrink:0;display:inline-flex;align-items:center;gap:6px}.course-nav-item:hover{background:rgba(0,123,255,.1);border-color:rgba(0,123,255,.3);color:#007bff;transform:translateY(-2px);box-shadow:0 4px 12px rgba(0,123,255,.15)}.course-nav-item.active{background:linear-gradient(135deg,#007bff 0%,#0056b3 100%);border-color:#0056b3;color:#fff;box-shadow:0 4px 15px rgba(0,123,255,.3);color:#fff;box-shadow:rgba(0,123,255,.3) 0 4px 15px;background:var(--bs-code-color);border-color:#0056b3}.course-nav-item.active::before{content:"✓";display:inline-block;margin-right:4px}.course-nav-icon{font-size:12px;opacity:.7}@media(max-width:768px){.course-nav-wrapper{top:70px}.course-nav-item{padding:7px 12px;font-size:13px}.course-nav-icon{display:none}}@media(max-width:576px){.course-nav-item{padding:6px 10px;font-size:12px}}