.course-nav-btn{display:inline-block;padding:12px 24px;background-color:#0073aa;color:#ffffff;text-decoration:none;border-radius:4px;font-weight:bold;transition:all 0.3s ease}.course-nav-btn:hover{background-color:#005177}.disabled-btn{opacity:0.5;cursor:not-allowed!important;pointer-events:none!important;background-color:#cccccc!important;color:#666666!important}