.course-player-overlay{position:fixed;top:0;left:0;width:100%;height:100%;background-color:rgba(0,0,0,.8);z-index:1000;display:flex;justify-content:center;align-items:center}.course-player-container{position:relative;width:90%;max-width:800px;aspect-ratio:16/9;background-color:#000;border-radius:10px;overflow:hidden;box-shadow:0 4px 10px rgba(0,0,0,.25)}.course-player-close-btn{position:absolute;top:20px;right:20px;background-color:hsla(0,0%,100%,.8);border:none;border-radius:50%;width:40px;height:40px;display:flex;justify-content:center;align-items:center;cursor:pointer;font-size:1.2rem;color:#333;transition:background-color .3s ease}.course-player-close-btn:hover{background-color:#fff}.course-player-loading{color:#fff;display:flex;justify-content:center;align-items:center;height:100%}