body{font-family:Arial,sans-serif;margin:0;background:#f7fbff;color:#1f2937} header{background:#0ea5a8;color:#fff;padding:40px 20px;text-align:center} nav{background:#083344;padding:12px;text-align:center} nav a{color:#fff;margin:0 12px;text-decoration:none;font-weight:bold} main{max-width:900px;margin:auto;padding:30px 20px} .btn,button{background:#0ea5a8;color:#fff;padding:12px 20px;border:none;border-radius:8px;text-decoration:none;cursor:pointer} input,select{display:block;width:100%;max-width:500px;padding:12px;margin:10px 0;border:1px solid #cbd5e1;border-radius:6px}