.isi-form { max-width: 600px; margin: 20px auto; background: #f5f5f5; padding: 20px; border-radius: 10px; }
.isi-form h3 { margin-top: 20px; }
.isi-form input, .isi-form select { width: 100%; margin: 5px 0 15px; padding: 8px; }
.isi-messages { background: #e6f7e6; border: 1px solid #b5deb5; padding: 10px; margin-bottom: 15px; border-radius: 5px; }