.learning-hub{max-width:1200px;margin:0 auto;padding:40px 20px;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif}.learning-hub-header{text-align:center;margin-bottom:40px}.loading{text-align:center;padding:50px;color:#666}.courses-list{display:grid;gap:24px;max-width:900px;margin:0 auto}.course-card{background:#fff;border:1px solid #e2e8f0;border-radius:12px;padding:30px;box-shadow:0 4px 6px -1px #0000001a;transition:transform .2s}.course-card:hover{transform:translateY(-4px);box-shadow:0 10px 15px -3px #0000001a}.btn-primary{background:#5b4fe9;color:#fff;border:none;padding:10px 20px;border-radius:6px;font-weight:600;cursor:pointer;transition:background .2s}.btn-primary:hover{background:#4a3fd8}.course-detail{max-width:900px;margin:0 auto}.btn-back{background:none;border:none;color:#5b4fe9;cursor:pointer;margin-bottom:20px;font-weight:600}.module-card{border:1px solid #e2e8f0;border-radius:8px;margin-bottom:16px;background:#fff}.module-header{padding:20px;background:#f8fafc;cursor:pointer;display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid transparent;transition:all .2s ease}.module-header:hover{background:#eff6ff;border-color:#bfdbfe}.module-card[data-active=true]{border:2px solid #6366f1}.module-content{padding:0 20px 20px}.lessons-list{margin-top:15px;display:flex;flex-direction:column;gap:8px}.lesson-item{padding:12px;background:#f1f5f9;border-radius:6px;cursor:pointer;display:flex;align-items:center;gap:12px}.lesson-item:hover{background:#e2e8f0}.lesson-item.completed .lesson-status{color:#22c55e}.lesson-view{position:fixed;top:0;left:0;right:0;bottom:0;background:#0009;z-index:2000;display:flex;align-items:center;justify-content:center;padding:20px}.lesson-modal{background:#fff;width:100%;max-width:850px;height:85vh;border-radius:12px;box-shadow:0 25px 50px -12px #00000040;display:flex;flex-direction:column;overflow:hidden}.lesson-header{padding:20px 30px;border-bottom:1px solid #e2e8f0;display:flex;justify-content:space-between;align-items:center;background:#fff;flex-shrink:0}.lesson-content{padding:30px;overflow-y:auto;flex-grow:1}.video-responsive-wrapper{background:#000;width:100%;display:flex;justify-content:center;margin-bottom:25px;border-radius:8px;overflow:hidden}.video-responsive-wrapper video{max-height:450px;width:100%}