OTP embossed form animation | HTML, CSS & JavaScript

<div id="otpForm">
                <div class="lock">🔐</div>
                <h1>Verify Your OTP</h1>
                <p class="description">
                    We've sent a 6-digit verification code to
                    <br>
                    <span class="phone">+91 XXXXX 00945</span>
                </p>
                <div class="otp-inputs" id="otpInputs">
                    <input class="otp-input" type="text" inputmode="numeric" maxlength="1" autocomplete="one-time-code">
                    <input class="otp-input" type="text" inputmode="numeric" maxlength="1">
                    <input class="otp-input" type="text" inputmode="numeric" maxlength="1">
                    <input class="otp-input" type="text" inputmode="numeric" maxlength="1">
                    <input class="otp-input" type="text" inputmode="numeric" maxlength="1">
                    <input class="otp-input" type="text" inputmode="numeric" maxlength="1">
                </div>
                <button class="verify-btn" id="verifyBtn">
                    VERIFY OTP
                </button>
                <div class="timer">
                    Resend OTP in <span id="timer">30</span> seconds
                </div>
                <button class="resend" id="resendBtn">
                    RESEND OTP
                </button>
                <div class="message" id="message"></div>
            </div>

<div class="success-screen" id="successScreen">
                <div class="success-icon">
                    ✓
                </div>
                <h2>Verification Successful</h2>
                <p>
                    Your OTP has been verified successfully.
                    <br>
                    Your account is now secure.
                </p>
            </div>
        </div>
    </div>

* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

:root {
            --bg: #e7ebf0;
            --light: #ffffff;
            --dark: #b8c0ca;
            --text: #39424e;
            --accent: #00a8ff;
            --success: #16a085;
            --danger: #e74c3c;
        }

body {
            min-height: 100vh;
            display: flex;
            justify-content: center;
            align-items: center;
            font-family: Arial, Helvetica, sans-serif;
            background: var(--bg);
            overflow: hidden;
        }

/* Background decoration */
        body::before,
        body::after {
            content: "";
            position: fixed;
            width: 280px;
            height: 280px;
            border-radius: 50%;
            filter: blur(80px);
            opacity: .25;
            z-index: -1;
        }

body::before {
            background: #00a8ff;
            top: -100px;
            left: -80px;
        }

body::after {
            background: #7c4dff;
            bottom: -100px;
            right: -80px;
        }

/* Main Card */
        .otp-wrapper {
            position: relative;
            width: 420px;
            max-width: calc(100% - 30px);
            padding: 3px;
            border-radius: 28px;
            overflow: hidden;
            box-shadow:
                18px 18px 35px rgba(163, 174, 187, .65),
                -18px -18px 35px rgba(255, 255, 255, .95);
        }

/* Electric border */
        .otp-wrapper::before {
            content: "";
            position: absolute;
            inset: -50%;
            background: conic-gradient(transparent 0deg,
                    transparent 30deg,
                    #00a8ff 55deg,
                    #ffffff 65deg,
                    #00e5ff 75deg,
                    transparent 100deg,
                    transparent 180deg,
                    #7c4dff 210deg,
                    #00a8ff 240deg,
                    transparent 270deg,
                    transparent 360deg);
            animation: electricSpin 3s linear infinite;
        }

@keyframes electricSpin {
            to {
                transform: rotate(360deg);
            }
        }

/* Electric glow */
        .otp-wrapper::after {
            content: "";
            position: absolute;
            inset: 0;
            border-radius: 28px;
            box-shadow:
                0 0 8px #00a8ff,
                0 0 20px rgba(0, 168, 255, .6),
                0 0 40px rgba(0, 168, 255, .25);
            pointer-events: none;
            animation: electricGlow 1.4s ease-in-out infinite alternate;
        }

@keyframes electricGlow {
            from {
                opacity: .35;
            }

to {
                opacity: 1;
            }
        }

.otp-card {
            position: relative;
            z-index: 2;
            background: var(--bg);
            border-radius: 25px;
            padding: 42px 35px;
            text-align: center;
        }

/* Lock icon */
        .lock {
            width: 75px;
            height: 75px;
            margin: 0 auto 22px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 32px;
            border-radius: 50%;

background: var(--bg);

box-shadow:
                inset 7px 7px 13px var(--dark),
                inset -7px -7px 13px var(--light),
                8px 8px 18px rgba(163, 174, 187, .4),
                -8px -8px 18px rgba(255, 255, 255, .8);

animation: lockPulse 2s ease-in-out infinite;
        }

@keyframes lockPulse {

0%,
            100% {
                transform: translateY(0);
            }

50% {
                transform: translateY(-5px);
            }
        }

h1 {
            color: var(--text);
            font-size: 27px;
            margin-bottom: 10px;
            letter-spacing: .5px;

text-shadow:
                2px 2px 3px rgba(163, 174, 187, .8),
                -1px -1px 2px white;
        }

.description {
            color: #77818d;
            font-size: 14px;
            line-height: 1.6;
            margin-bottom: 28px;
        }

.phone {
            font-weight: bold;
            color: #4c5662;
        }

/* OTP inputs */
        .otp-inputs {
            display: flex;
            justify-content: center;
            gap: 10px;
            margin: 25px 0;
        }

.otp-input {
            width: 47px;
            height: 58px;
            border: none;
            outline: none;
            text-align: center;
            font-size: 22px;
            font-weight: bold;
            color: var(--text);
            border-radius: 13px;
            background: var(--bg);

box-shadow:
                inset 5px 5px 9px var(--dark),
                inset -5px -5px 9px var(--light);

transition: .25s ease;
        }

.otp-input:focus {
            color: var(--accent);

box-shadow:
                inset 2px 2px 5px var(--dark),
                inset -2px -2px 5px var(--light),
                0 0 0 2px rgba(0, 168, 255, .2),
                0 0 15px rgba(0, 168, 255, .35);

transform: translateY(-3px);
        }

/* Verify button */
        .verify-btn {
            width: 100%;
            height: 54px;
            border: none;
            border-radius: 15px;
            background: var(--bg);
            color: var(--text);
            font-size: 15px;
            font-weight: bold;
            cursor: pointer;
            letter-spacing: 1px;

box-shadow:
                8px 8px 15px var(--dark),
                -8px -8px 15px var(--light);

transition: .25s ease;
        }

.verify-btn:hover {
            color: var(--accent);
            transform: translateY(-2px);
        }

.verify-btn:active {
            transform: translateY(1px);

box-shadow:
                inset 5px 5px 10px var(--dark),
                inset -5px -5px 10px var(--light);
        }

/* Timer */
        .timer {
            margin-top: 22px;
            font-size: 13px;
            color: #818b96;
        }

.timer span {
            color: var(--accent);
            font-weight: bold;
        }

/* Resend */
        .resend {
            margin-top: 12px;
            border: none;
            background: transparent;
            color: var(--accent);
            cursor: pointer;
            font-size: 13px;
            font-weight: bold;
            display: none;
        }

.resend:hover {
            text-decoration: underline;
        }

/* Message */
        .message {
            min-height: 20px;
            margin-top: 18px;
            font-size: 13px;
            font-weight: bold;
        }

.message.success {
            color: var(--success);
        }

.message.error {
            color: var(--danger);
        }

/* Error shake */
        .shake {
            animation: shake .45s ease;
        }

@keyframes shake {

0%,
            100% {
                transform: translateX(0);
            }

20% {
                transform: translateX(-8px);
            }

40% {
                transform: translateX(8px);
            }

60% {
                transform: translateX(-6px);
            }

80% {
                transform: translateX(6px);
            }
        }

/* Success */
        .success-screen {
            display: none;
            animation: successAppear .5s ease forwards;
        }

@keyframes successAppear {
            from {
                opacity: 0;
                transform: scale(.8);
            }

to {
                opacity: 1;
                transform: scale(1);
            }
        }

.success-icon {
            width: 100px;
            height: 100px;
            margin: 0 auto 25px;
            border-radius: 50%;
            display: flex;
            justify-content: center;
            align-items: center;

font-size: 50px;
            color: var(--success);

background: var(--bg);

box-shadow:
                inset 7px 7px 14px var(--dark),
                inset -7px -7px 14px var(--light),
                8px 8px 18px rgba(163, 174, 187, .4),
                -8px -8px 18px rgba(255, 255, 255, .8);

animation: successPop .7s cubic-bezier(.17, .67, .35, 1.4);
        }

@keyframes successPop {
            0% {
                transform: scale(0) rotate(-90deg);
            }

70% {
                transform: scale(1.15) rotate(10deg);
            }

100% {
                transform: scale(1) rotate(0);
            }
        }

.success-screen h2 {
            color: var(--success);
            margin-bottom: 10px;
        }

.success-screen p {
            color: #77818d;
            font-size: 14px;
            line-height: 1.6;
        }

/* Responsive */
        @media (max-width: 480px) {

.otp-card {
                padding: 35px 20px;
            }

.otp-inputs {
                gap: 7px;
            }

.otp-input {
                width: 42px;
                height: 54px;
                font-size: 20px;
            }

h1 {
                font-size: 24px;
            }
        }

@media (max-width: 350px) {

.otp-inputs {
                gap: 4px;
            }

.otp-input {
                width: 38px;
                height: 50px;
            }
        }

const inputs = document.querySelectorAll(".otp-input");
        const verifyBtn = document.getElementById("verifyBtn");
        const message = document.getElementById("message");
        const timerElement = document.getElementById("timer");
        const resendBtn = document.getElementById("resendBtn");
        const timerBox = document.querySelector(".timer");
        const otpForm = document.getElementById("otpForm");
        const successScreen = document.getElementById("successScreen");

/* Demo OTP */
        const correctOTP = "123456";
        
        /* --------------------------------
           OTP INPUT BEHAVIOR
        -------------------------------- */

inputs.forEach((input, index) => {
            input.addEventListener("input", (e) => {
                // Numbers only
                input.value = input.value.replace(/[^0-9]/g, "");
                if (input.value && index < inputs.length - 1) {
                    inputs[index + 1].focus();
                }
                message.textContent = "";
                message.className = "message";
            });

input.addEventListener("keydown", (e) => {

if (
                    e.key === "Backspace" &&
                    !input.value &&
                    index > 0
                ) {
                    inputs[index - 1].focus();
                }

});

/* Paste OTP */
            input.addEventListener("paste", (e) => {

e.preventDefault();

const pastedData =
                    e.clipboardData
                        .getData("text")
                        .replace(/\D/g, "")
                        .slice(0, 6);

pastedData.split("").forEach((digit, i) => {

if (inputs[i]) {
                        inputs[i].value = digit;
                    }

});

if (pastedData.length > 0) {
                    inputs[Math.min(pastedData.length, 6) - 1].focus();
                }

});

/* --------------------------------
           VERIFY OTP
        -------------------------------- */

verifyBtn.addEventListener("click", verifyOTP);
        function verifyOTP() {
            let otp = "";
            inputs.forEach(input => {
                otp += input.value;
            });

if (otp.length !== 6) {
                showError("Please enter the complete 6-digit OTP.");
                return;
            }

if (otp === correctOTP) {
                showSuccess();
            } else {
                showError("Invalid OTP. Please try again.");
            }
        }

/* --------------------------------
           ERROR
        -------------------------------- */
        function showError(text) {
            message.textContent = text;
            message.className = "message error";
            document.querySelector(".otp-card").classList.remove("shake");
            // Restart animation
            void document.querySelector(".otp-card").offsetWidth;
            document.querySelector(".otp-card").classList.add("shake");
            inputs.forEach(input => {
                input.style.boxShadow = `
                inset 5px 5px 9px var(--dark),
                inset -5px -5px 9px var(--light),
                0 0 12px rgba(231,76,60,.35)
            `;
            });

setTimeout(() => {
                inputs.forEach(input => {
                    input.style.boxShadow = "";
                });
            }, 800);
        }

/* --------------------------------
           SUCCESS
        -------------------------------- */

function showSuccess() {
            otpForm.style.display = "none";
            successScreen.style.display = "block";
        }

/* --------------------------------
           COUNTDOWN
        -------------------------------- */

let timeLeft = 30;
        let countdown = setInterval(() => {
            timeLeft--;
            timerElement.textContent = timeLeft;
            if (timeLeft <= 0) {
                clearInterval(countdown);
                timerBox.style.display = "none";
                resendBtn.style.display = "inline-block";
            }
        }, 1000);

/* --------------------------------
           RESEND OTP
        -------------------------------- */
        resendBtn.addEventListener("click", () => {
            timeLeft = 30;
            timerElement.textContent = timeLeft;
            timerBox.style.display = "block";
            resendBtn.style.display = "none";
            message.textContent = "A new OTP has been sent.";
            message.className = "message success";
            inputs.forEach(input => {
                input.value = "";
            });

inputs[0].focus();
            countdown = setInterval(() => {
                timeLeft--;
                timerElement.textContent = timeLeft;
                if (timeLeft <= 0) {
                    clearInterval(countdown);
                    timerBox.style.display = "none";
                    resendBtn.style.display = "inline-block";
                }
            }, 1000);
        });

/* Auto focus */
        inputs[0].focus();

- OTP embossed form animation

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