:root{color-scheme:light;font-family:system-ui,-apple-system,Segoe UI,Roboto,Arial,sans-serif;color:#1c304d;background:#f5f7fa}*{box-sizing:border-box}body{margin:0}header{background:#1d3555;color:#fff;padding:20px max(20px,calc((100vw - 900px)/2))}header a{color:#fff;text-decoration:none;font-weight:750}main{max-width:900px;margin:36px auto;padding:0 20px}article{background:white;padding:clamp(22px,5vw,54px);border-radius:14px;box-shadow:0 3px 20px #132f4d14;line-height:1.75;font-size:16px}h1{font-size:clamp(25px,4vw,38px);line-height:1.2;margin:0 0 18px}h2{font-size:19px;margin:30px 0 10px;line-height:1.4}p{margin:0 0 15px;overflow-wrap:anywhere}nav{margin:28px 0;line-height:2}nav a{color:#2057a5}footer{text-align:center;color:#54657b;font-size:14px;padding:25px}.preview{background:#fff4d5;color:#704c0b;padding:12px 20px;text-align:center;font-size:14px}