body { transition: background-color 0.3s, color 0.3s; }
.form-input { width: 100%; padding: 10px; border: 1px solid #ddd; border-radius: 5px; background: white; color: black; }
.btn-submit { background-color: #ff4081; color: white; padding: 10px; border: none; cursor: pointer; }
.thank-you { font-size: 24px; text-align: center; margin-top: 50px; }
.fireworks { background: url('fireworks.gif') no-repeat center center; background-size: cover; }
.modal-content { max-width: 90%; width: 400px; background: white; color: black; }
.dark-mode .modal-content { background: #222; color: white; }