:root{--bg:#f7f8fa;--card:#fff;--ink:#1f2430;--muted:#5b6472;--line:#e4e7ee;--acc:#2563eb}
*{box-sizing:border-box}body{margin:0;font-family:-apple-system,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;background:var(--bg);color:var(--ink);line-height:1.75}
header{background:#111827;color:#f9fafb;padding:44px 20px 30px}
.wrap{max-width:880px;margin:0 auto;padding:0 20px}
header h1{margin:0 0 6px;font-size:30px}header p{margin:0;color:#c7cedb}
nav{background:#1f2937;padding:10px 0}nav a{color:#dbe4f3;text-decoration:none;margin-right:22px;font-size:15px}nav a:hover{color:#fff}
main{padding:28px 0 50px}
.card{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:22px 26px;margin-bottom:20px}
h2{margin-top:0;font-size:21px}h3{font-size:17px;margin-bottom:4px}
a{color:var(--acc)} .muted{color:var(--muted)} .tag{display:inline-block;background:#eef2ff;color:#3730a3;border-radius:999px;padding:1px 10px;font-size:12px;margin-right:6px}
footer{border-top:1px solid var(--line);padding:20px 0 34px;color:var(--muted);font-size:14px}
ul{padding-left:22px} li{margin:5px 0}