:root{color-scheme:light}*{box-sizing:border-box}body{margin:0;background:#fbfbfa;color:#1a1a1a;font:18px/1.7 "Microsoft YaHei",sans-serif}
main{max-width:650px;margin:15vh auto;padding:40px;border-top:3px solid #8a6a3d;background:white}
h1{font-size:32px;margin:16px 0}.brand{color:#8a6a3d;font-weight:600}.muted{color:#6b6b6b;font-size:15px}