*{margin:0;padding:0;box-sizing:border-box}:root{--primary: #e65100;--primary-light: #ff8a50;--bg: #fafafa;--card-bg: #ffffff;--text: #333333;--text-light: #888888;--border: #eeeeee;--radius: 12px}body{font-family:-apple-system,BlinkMacSystemFont,Helvetica Neue,PingFang SC,Microsoft YaHei,sans-serif;background:var(--bg);color:var(--text);-webkit-font-smoothing:antialiased;max-width:750px;margin:0 auto}a{color:var(--primary);text-decoration:none}button{border:none;cursor:pointer;font-family:inherit}input{font-family:inherit;outline:none}img{max-width:100%;display:block}