body{font-family:Segoe UI,Tahoma,Geneva,Verdana,sans-serif;background-color:#f4f4f4;margin:0;padding:0;text-align:center}h1{color:#333;margin-top:20px}video{margin-top:30px;border-radius:12px;box-shadow:0 4px 8px #0000001a}.popup{position:fixed;top:80%;left:50%;transform:translate(-50%,-50%);background-color:#fff;padding:25px 35px;border:2px solid #ddd;border-radius:12px;box-shadow:0 10px 25px #0003;z-index:1000}.popup button{display:block;margin:10px auto;padding:10px 20px;background-color:#007bff;color:#fff;font-weight:500;border:none;border-radius:6px;cursor:pointer;transition:background .3s ease}.popup button:hover{background-color:#0056b3}