This project builds an interactive credit card UI that visually reacts to user input in real time. As users type card details into the form, the credit card graphic updates instantly, creating a realistic payment experience. The card flips automatically when entering the CVV, mimicking real-world behavior. Visual highlights guide users to the active card section, improving usability. Overall, the project combines animation, form interaction, and polished UI design to simulate a modern payment interface.
HTML
<section id="card" class="card">The HTML defines two tightly connected components: a visual credit card and an input form. The card itself is split into front and back sections, allowing it to flip in 3D when required. Individual elements such as the card number, holder name, expiry date, and CVV each have dedicated containers so they can be updated dynamically. Placeholder symbols are pre-rendered to animate smoothly as numbers are entered. The form section contains inputs and dropdowns that map directly to fields on the card. This clear one-to-one mapping makes it easy for JavaScript to synchronize form data with the card display. SVG graphics are used for the card logo to ensure sharp rendering at all sizes. The structure is semantic and modular, which keeps the layout readable and easy to maintain.
CSS
.card:hover,
.card.flip {
transform: rotateY(180deg);
}The CSS brings the credit card to life using 3D transforms, gradients, and subtle lighting effects. The .card container uses transform-style: preserve-3d so the front and back can rotate realistically. When the flip class is applied, the card rotates 180 degrees, revealing the CVV side. Gradient backgrounds and blurred color blobs create a premium card appearance. The highlight box animates smoothly to indicate the active card section, helping users understand where their input is reflected. Typography, spacing, and shadows are carefully tuned to match modern fintech UI standards. Form elements are styled for clarity and focus, with strong visual feedback on interaction. Responsive rules ensure the card scales properly on smaller screens. Overall, the CSS focuses on realism, clarity, and smooth animation.
JavaScript
document.getElementById("cvv").addEventListener("focus", () => {
document.getElementById("card").classList.add("flip");
});
The JavaScript synchronizes user input with the animated card in real time. Focus events control which card section is highlighted and whether the card flips to the back. As the card number is typed, individual digits animate into place, masking middle numbers for security. The holder name and expiration date update instantly as the user types or selects values. CVV input replaces digits with asterisks and displays them on the card’s back side. Logic is included to handle both forward typing and deletion smoothly. The script also manages animation states by toggling CSS classes rather than forcing visual changes directly. This separation keeps the logic clean and performant. Overall, JavaScript acts as the bridge that connects form behavior with visual feedback.
