body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;background:#fafafa;color:#222;line-height:1.7;}
a{color:#0d6efd;text-decoration:none;}a:hover{text-decoration:underline;}
header{background:#fff;border-bottom:1px solid #ddd;padding:14px 0;position:sticky;top:0;z-index:10;}
header .inner{max-width:1100px;margin:auto;padding:0 16px;display:flex;justify-content:space-between;flex-wrap:wrap;align-items:center;}
nav ul{list-style:none;margin:0;padding:0;display:flex;gap:14px;}
.wrapper{max-width:1100px;margin:auto;padding:0 16px 40px;}
.card{background:#fff;padding:18px 20px;margin-top:18px;border-radius:12px;box-shadow:0 4px 12px rgba(0,0,0,.06);}
h1{font-size:22px;}
h2{font-size:18px;margin:14px 0 6px;}
h3{font-size:15px;margin:10px 0 4px;}
footer{text-align:center;padding:20px 0;color:#666;font-size:12px;margin-top:30px;border-top:1px solid #ddd;}