* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.7;
  color: #1a1a2e;
  background: #f7f7fb;
  max-width: 820px;
  margin: 0 auto;
  padding: 2rem 1.5rem 5rem;
}
header.site { border-bottom: 2px solid #e0e0ec; margin-bottom: 2.5rem; padding-bottom: 1rem; }
nav a { color: #4a4ae0; text-decoration: none; margin-right: 1.5rem; font-weight: 600; }
nav a:hover { text-decoration: underline; }
h1 { font-size: 2.2rem; line-height: 1.2; margin-bottom: 0.5rem; color: #16162e; }
h2 { font-size: 1.5rem; margin: 2.5rem 0 0.8rem; color: #2a2a4e; border-left: 4px solid #4a4ae0; padding-left: 0.8rem; }
h3 { font-size: 1.15rem; margin: 1.8rem 0 0.6rem; color: #3a3a5e; }
p { margin-bottom: 1.1rem; }
.lead { font-size: 1.2rem; color: #55556e; margin-bottom: 2rem; }
.meta { color: #8888a0; font-size: 0.9rem; margin-bottom: 2rem; }
ul, ol { margin: 0 0 1.2rem 1.6rem; }
li { margin-bottom: 0.5rem; }
code { background: #ececf6; padding: 0.15rem 0.4rem; border-radius: 4px; font-family: 'SF Mono', Menlo, Monaco, Consolas, monospace; font-size: 0.9em; color: #b8005a; }
pre { background: #1a1a2e; color: #e6e6f0; padding: 1.2rem; border-radius: 8px; overflow-x: auto; margin-bottom: 0.6rem; font-size: 0.85rem; line-height: 1.5; }
pre code { background: none; color: inherit; padding: 0; }
.download { display: inline-block; background: #4a4ae0; color: #fff; padding: 0.5rem 1rem; border-radius: 6px; text-decoration: none; font-size: 0.9rem; font-weight: 600; margin: 0.3rem 0 1.5rem; }
.download:hover { background: #3a3ad0; }
.callout { background: #fff4e0; border-left: 4px solid #e0a020; padding: 1rem 1.2rem; border-radius: 6px; margin: 1.5rem 0; }
.callout.warn { background: #ffe8e8; border-left-color: #e04040; }
.callout.tip { background: #e8f6ec; border-left-color: #30a050; }
footer { margin-top: 4rem; padding-top: 1.5rem; border-top: 1px solid #e0e0ec; color: #8888a0; font-size: 0.85rem; }