body{font-family:Arial,'Noto Sans Thai',sans-serif;max-width:850px;margin:0 auto;padding:30px 22px;line-height:1.8;color:#1b293b;background:#f7faff}header{background:#e7f2ff;padding:18px;border-radius:12px}nav a{margin-right:18px;color:#1261a0}main{background:white;padding:24px;margin-top:22px;border-radius:12px}h1,h2{color:#155b92}footer{margin-top:24px;font-size:14px;color:#526276}