* { box-sizing: border-box; }
body { margin: 0; background: #f6f7fb; color: #1b2233; font: 16px/1.65 system-ui, "Segoe UI", "Malgun Gothic", sans-serif; }
header { background: #121a33; color: #fff; padding: 14px 20px; display: flex; flex-wrap: wrap; gap: 16px; align-items: center; }
header .logo { color: #fff; font-weight: 800; text-decoration: none; margin-right: auto; }
header nav a { color: #c9d3ff; margin-left: 14px; text-decoration: none; }
main { max-width: 820px; margin: 0 auto; padding: 24px 20px 40px; background: #fff; }
h1 { font-size: 28px; margin: 8px 0 12px; }
h2 { font-size: 19px; margin: 26px 0 8px; }
.lead { font-size: 18px; }
.muted { color: #6b7486; font-size: 14px; }
code { background: #f1f3f8; padding: 1px 5px; border-radius: 4px; font-size: 14px; }
hr { margin: 40px 0; border: none; border-top: 1px solid #e3e7ef; }
footer { max-width: 820px; margin: 0 auto; padding: 16px 20px 40px; font-size: 14px; color: #6b7486; }
a { color: #2f5bff; }