* { box-sizing: border-box; }
body { margin: 0; font-family: -apple-system, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
       color: #1f2430; background: #f7f8fa; line-height: 1.75; font-size: 15px; }
.topbar { position: sticky; top: 0; z-index: 10; display: flex; align-items: center; gap: 16px;
          background: #16233a; color: #fff; padding: 12px 24px; }
.topbar .home { color: #fff; font-weight: 600; text-decoration: none; font-size: 16px; }
.topbar .crumb { color: #9fb0cc; font-size: 14px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.content { max-width: 960px; margin: 28px auto; padding: 0 20px; background: #fff;
           border-radius: 10px; box-shadow: 0 1px 4px rgba(20,30,50,.08); padding: 40px 48px; }
.content h1 { font-size: 26px; border-bottom: 2px solid #e8ecf3; padding-bottom: 12px; }
.content h2 { font-size: 21px; margin-top: 34px; border-left: 4px solid #2f6fed; padding-left: 10px; }
.content h3 { font-size: 17px; margin-top: 26px; }
table { border-collapse: collapse; width: 100%; margin: 16px 0; font-size: 14px; }
th, td { border: 1px solid #dde3ec; padding: 8px 12px; text-align: left; vertical-align: top; }
th { background: #eef2f9; }
tr:nth-child(even) td { background: #fafbfd; }
pre { background: #10151f; color: #e6edf7; padding: 16px; border-radius: 8px; overflow-x: auto;
      font-size: 13px; line-height: 1.6; }
code { font-family: Consolas, "JetBrains Mono", monospace; }
p code, li code, td code { background: #eef1f6; color: #c7254e; padding: 1px 6px; border-radius: 4px; font-size: 13px; }
blockquote { border-left: 4px solid #c9d5e8; background: #f3f6fa; margin: 14px 0; padding: 10px 18px; color: #4a5568; }
hr { border: none; border-top: 1px solid #e5e9f0; margin: 28px 0; }
a { color: #2f6fed; }
.footer { max-width: 960px; margin: 0 auto 40px; padding: 0 20px; display: flex; justify-content: space-between;
          color: #8b95a5; font-size: 13px; }
@media (max-width: 720px) { .content { padding: 24px 18px; } .topbar { flex-wrap: wrap; gap: 6px; } }