* { box-sizing: border-box; }
html { color-scheme: light; font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; }
body { margin: 0; background: #f7f7fb; color: #171525; line-height: 1.7; }
header { background: #fff; border-bottom: 1px solid #e8e6ef; }
.nav { max-width: 900px; margin: auto; padding: 18px 24px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { color: #2f1f6f; font-size: 21px; font-weight: 750; text-decoration: none; }
.back { color: #554a72; text-decoration: none; }
main { max-width: 900px; margin: 42px auto; padding: 0 24px; }
article { background: #fff; border: 1px solid #e8e6ef; border-radius: 18px; padding: 42px; box-shadow: 0 10px 35px rgba(34, 25, 70, .06); }
h1 { margin: 0 0 6px; font-size: clamp(30px, 5vw, 42px); line-height: 1.2; }
h2 { margin: 30px 0 7px; font-size: 21px; line-height: 1.35; }
.updated { margin: 0 0 32px; color: #716b7c; font-size: 14px; }
a { color: #5540d8; }
footer { max-width: 900px; margin: 0 auto 40px; padding: 0 24px; color: #716b7c; font-size: 14px; }
@media (max-width: 600px) { article { padding: 26px 22px; } .nav { padding: 15px 20px; } }