body { margin: 0; font-family: Arial, sans-serif; background: #f4f6f8; color: #20242a; }
main { max-width: 1040px; margin: 0 auto; padding: 28px; }
nav { display: flex; gap: 16px; margin: 16px 0 24px; }
a { color: #1b5f9e; }
article, section { border-top: 1px solid #d7dde3; padding: 14px 0; }
pre { white-space: pre-wrap; background: #fff; padding: 12px; border: 1px solid #d7dde3; }
input, textarea { display: block; width: 100%; max-width: 720px; margin: 8px 0; padding: 10px; }
button { padding: 10px 14px; background: #20242a; color: #fff; border: 0; }