.course-browser{display:grid;grid-template-columns:320px 1fr;gap:22px;align-items:start}.structure-panel{position:sticky;top:90px;background:#091b38;color:#dce8f7;border:1px solid #1b3b63;border-radius:10px;overflow:hidden}.structure-head{padding:22px;border-bottom:1px solid #1c3b61;background:linear-gradient(145deg,#0c2852,#091932)}.structure-head span{color:#45d8f5;font-size:8px;letter-spacing:2px;font-weight:800}.structure-head h3{font-size:22px;margin:5px 0 3px}.structure-head p{font-size:10px;color:#849bb9;margin:0}.course-tree{padding:12px;max-height:70vh;overflow:auto}.student-node{position:relative}.student-node:before{content:'';position:absolute;left:11px;top:34px;bottom:0;border-left:1px solid #24466e}.student-line{display:flex;align-items:center;gap:6px;padding:8px 7px;border-radius:5px;cursor:pointer}.student-line:hover,.student-line.active{background:#13355e}.student-toggle{width:22px;flex:none;color:#57d9f1;font-size:10px}.student-title{font-size:12px;line-height:1.4}.student-badge{margin-left:auto;color:#6683a5;font-size:8px}.student-children{margin-left:22px}.student-node.collapsed>.student-children{display:none}.content-panel{min-width:0}.breadcrumb{min-height:45px;margin-bottom:14px;padding:12px 16px;background:#fff;border:1px solid var(--line);border-left:3px solid #20bada;border-radius:6px;color:#54708d;font-size:12px}.content-panel .resource-grid{grid-template-columns:repeat(2,1fr)}.content-panel .empty{padding:80px 20px}.tree-empty{padding:35px 15px;color:#758ba8;text-align:center;font-size:11px}@media(max-width:900px){.course-browser{grid-template-columns:1fr}.structure-panel{position:static}.course-tree{max-height:none}.content-panel .resource-grid{grid-template-columns:1fr 1fr}}@media(max-width:600px){.content-panel .resource-grid{grid-template-columns:1fr}.structure-head{padding:17px}.course-tree{padding:8px}}