*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,sans-serif;line-height:1.6;color:#333;background-color:#f5f5f5}#app{max-width:800px;margin:0 auto;padding:20px}.view{background:#fff;border-radius:8px;padding:30px;box-shadow:0 2px 10px #0000001a}h1{margin-bottom:20px;color:#2c3e50}.button-group{display:flex;flex-direction:column;gap:10px;margin-top:20px}button{padding:12px 24px;font-size:16px;border:none;border-radius:6px;background-color:#3498db;color:#fff;cursor:pointer;transition:background-color .3s}button:hover{background-color:#2980b9}button:active{transform:scale(.98)}.log-container{max-height:400px;overflow-y:auto;border:1px solid #ddd;border-radius:4px;padding:10px;background-color:#f9f9f9;margin:20px 0}.log-entry{margin-bottom:10px;padding:8px;border-bottom:1px solid #eee}.log-time{color:#666;font-size:12px;margin-right:10px}.log-message{font-weight:500}.log-data{margin-top:5px;font-size:12px;color:#555;background-color:#fff;padding:5px;border-radius:3px;overflow-x:auto}.playground-content{margin:20px 0;padding:20px;background-color:#f0f0f0;border-radius:4px}