body{margin:0;font-family:Arial,sans-serif;background-color:#f4f4f4;padding:20px;text-align:center}h1{margin-bottom:20px;color:#333}#video-container{display:inline-block;border:2px solid #ccc;border-radius:8px;overflow:hidden;background-color:#000;max-width:100%;width:480px}#video{width:100%;height:auto}#qr-result{margin-top:20px;background-color:#fff;border:1px solid #999;border-radius:5px;padding:10px;display:none}#reset-btn{margin-top:10px;padding:8px 16px;background-color:#3f51b5;color:#fff;border:none;border-radius:4px;cursor:pointer}#reset-btn:hover{background-color:#303f9f}@media (max-width: 600px){body{display:flex;flex-direction:column;height:100vh;margin:0;padding:0}h1{text-align:center;padding:10px}#video-container{flex:1;max-height:50vh;width:100%;border:none;border-radius:0}#video{height:100%;width:100%;object-fit:cover}#qr-result{flex:1;margin:0;border:none;border-top:1px solid #ccc;border-radius:0;padding:20px;overflow-y:auto}#reset-btn{width:100%}}