* { margin: 0; padding: 0; box-sizing: border-box; }
body {
  font-family: -apple-system, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.7;
  color: #222;
  max-width: 760px;
  margin: 0 auto;
  padding: 0 20px 60px;
}
header { padding: 24px 0; border-bottom: 1px solid #eee; margin-bottom: 32px; }
nav a { margin-right: 20px; color: #1a5fb4; text-decoration: none; font-size: 15px; }
nav a:hover { text-decoration: underline; }
h1 { font-size: 28px; margin: 24px 0 16px; line-height: 1.3; }
h2 { font-size: 21px; margin: 32px 0 12px; }
p { margin-bottom: 16px; }
ul, ol { margin: 0 0 16px 24px; }
li { margin-bottom: 8px; }
a { color: #1a5fb4; }
code { background: #f4f4f4; padding: 2px 6px; border-radius: 4px; font-size: 14px; }
.breadcrumb { font-size: 14px; color: #666; margin-bottom: 20px; }
.breadcrumb a { color: #666; }
.card-list { list-style: none; margin-left: 0; }
.card-list li { border: 1px solid #eee; border-radius: 8px; padding: 16px 20px; margin-bottom: 12px; }
.card-list a { font-weight: 600; text-decoration: none; }
.card-list p { margin: 6px 0 0; font-size: 15px; color: #555; }
footer { margin-top: 48px; padding-top: 20px; border-top: 1px solid #eee; font-size: 14px; color: #888; }