:root{--brand:#ea3c2d;--ink:#1f2430;--ink-soft:#5b6472;--border:#e7e9ee;--bg-soft:#f7f8fa;}
*{box-sizing:border-box;margin:0;padding:0;}
body{font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",Helvetica,Arial,sans-serif;color:var(--ink);line-height:1.75;}
a{color:var(--brand);text-decoration:none;}
header{border-bottom:1px solid var(--border);padding:18px 0;}
.wrap{max-width:760px;margin:0 auto;padding:0 24px;}
.brand{font-weight:800;font-size:18px;}
main{padding:48px 0 80px;}
h1{font-size:28px;font-weight:800;margin-bottom:6px;}
.updated{color:var(--ink-soft);font-size:13px;margin-bottom:36px;}
h2{font-size:18px;font-weight:700;margin:32px 0 10px;}
p,li{color:#333;font-size:15px;margin-bottom:10px;}
ul{padding-left:22px;margin-bottom:10px;}
.back{display:inline-block;margin-bottom:18px;font-size:14px;color:var(--ink-soft);}
footer{border-top:1px solid var(--border);background:var(--bg-soft);padding:24px 0;text-align:center;color:var(--ink-soft);font-size:13px;}
.todo{color:#b45309;background:#fffbeb;border:1px dashed #f2c14e;border-radius:8px;padding:1px 8px;font-size:12px;font-weight:700;}