body{margin:0;font-family:Arial,sans-serif;background:#f5f7fb}nav{background:#0a66ff;color:#fff;padding:1rem}.container{max-width:900px;margin:2rem auto;background:#fff;padding:2rem;border-radius:12px;box-shadow:0 2px 10px #0000000d}label{display:block;margin:1rem 0 .25rem;font-weight:600}input{width:100%;padding:.75rem;border:1px solid #d4ddf0;border-radius:8px;background:#eef4ff}button{margin-top:1rem;width:100%;padding:.9rem;background:#0a66ff;color:#fff;border:0;border-radius:10px;font-weight:700}.error{color:#d70000;margin-top:1rem}.success-box{background:#f5f7fb;padding:1rem;border-radius:8px}a.button{display:inline-block;margin-top:1rem;padding:.7rem 1rem;background:#111;color:#fff;border-radius:8px;text-decoration:none}