body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
    max-width: 760px;
    margin: 0 auto;
    padding: 24px 20px 60px;
    color: #333;
    line-height: 1.8;
    font-size: 15px;
    background: #fff;
}
h1 { font-size: 22px; text-align: center; color: #222; margin-bottom: 6px; }
.meta { text-align: center; color: #888; font-size: 13px; margin-bottom: 16px; }
.lang { text-align: center; margin-bottom: 28px; font-size: 13px; }
.lang a { color: #1d4ed8; text-decoration: none; border-bottom: 1px solid #bfdbfe; }
.lang a:hover { border-bottom-color: #1d4ed8; }
h2 { font-size: 17px; color: #222; margin-top: 28px; border-left: 4px solid #3b82f6; padding-left: 10px; }
h3 { font-size: 15px; margin-top: 18px; color: #222; }
p { margin: 10px 0; }
ul { padding-left: 22px; }
li { margin: 6px 0; }
a { color: #1d4ed8; }
code { font-size: 0.92em; }
.highlight { background: #eff6ff; border: 1px solid #bfdbfe; padding: 12px 14px; border-radius: 6px; margin: 14px 0; }
.footer { margin-top: 40px; padding-top: 16px; border-top: 1px solid #eee; color: #888; font-size: 13px; text-align: center; line-height: 1.8; }
.footer a { color: #666; text-decoration: none; border-bottom: 1px solid #ccc; }
.footer a:hover { color: #1d4ed8; border-bottom-color: #1d4ed8; }