Embossed OTP UI | HTML, CSS & JavaScript

*{
    margin:0;
    padding:0;
    box-sizing:border-box;
    font-family:'Poppins',sans-serif;
}

body{
    min-height:100vh;
    display:flex;
    justify-content:center;
    align-items:center;
    background:
    radial-gradient(circle at top left,#1e293b,#0f172a 60%),
    linear-gradient(135deg,#111827,#020617);
    overflow:hidden;
}

body::before{
    content:'';
    position:absolute;
    width:450px;
    height:450px;
    background:linear-gradient(45deg,#3b82f6,#8b5cf6);
    border-radius:50%;
    filter:blur(120px);
    opacity:.25;
    top:-150px;
    left:-120px;
}

body::after{
    content:'';
    position:absolute;
    width:400px;
    height:400px;
    background:linear-gradient(45deg,#06b6d4,#0ea5e9);
    border-radius:50%;
    filter:blur(120px);
    opacity:.18;
    bottom:-120px;
    right:-100px;
}

.container{
    position:relative;
    width:520px;
    padding:45px 35px;
    border-radius:32px;
    background:rgba(15,23,42,.72);
    backdrop-filter:blur(18px);
    border:1px solid rgba(255,255,255,.08);
    box-shadow:
    25px 25px 50px rgba(0,0,0,.55),
    inset 2px 2px 4px rgba(255,255,255,.05),
    inset -4px -4px 10px rgba(0,0,0,.35);
    animation:floatCard 5s ease-in-out infinite;
	scale:0.8;
}

@keyframes floatCard{
    0%,100%{
        transform:translateY(0px);
    }
    50%{
        transform:translateY(-10px);
    }
}

.icon-wrap{
    width:90px;
    height:90px;
    margin:auto;
    border-radius:50%;
    display:flex;
    justify-content:center;
    align-items:center;
    background:#0f172a;
    box-shadow:
    inset 8px 8px 18px rgba(0,0,0,.8),
    inset -8px -8px 18px rgba(255,255,255,.05),
    0 0 25px rgba(59,130,246,.3);
}

.icon-wrap span{
    font-size:42px;
    color:#60a5fa;
    text-shadow:0 0 20px rgba(96,165,250,.8);
}

h2{
    color:white;
    text-align:center;
    margin-top:25px;
    font-size:32px;
    letter-spacing:1px;
}

p{
    color:#94a3b8;
    text-align:center;
    margin-top:10px;
    font-size:14px;
    line-height:1.6;
}

.otp-box{
    margin-top:35px;
    display:flex;
    justify-content:space-between;
    gap:14px;
}

.otp-box input{
    width:65px;
    height:72px;
    border:none;
    outline:none;
    border-radius:22px;
    background:#0f172a;
    color:white;
    text-align:center;
    font-size:28px;
    font-weight:600;
    transition:.35s ease;
    box-shadow:
    inset 8px 8px 14px rgba(0,0,0,.9),
    inset -4px -4px 10px rgba(255,255,255,.05),
    0 0 0 rgba(59,130,246,0);
}

.otp-box input:focus{
    transform:translateY(-6px) scale(1.05);
    color:#60a5fa;
    box-shadow:
    inset 4px 4px 10px rgba(0,0,0,.7),
    inset -2px -2px 8px rgba(255,255,255,.05),
    0 0 20px rgba(96,165,250,.55),
    0 0 40px rgba(96,165,250,.18);
}

.verify-btn{
    width:100%;
    margin-top:35px;
    padding:18px;
    border:none;
    border-radius:18px;
    background:linear-gradient(135deg,#3b82f6,#8b5cf6);
    color:white;
    font-size:17px;
    font-weight:600;
    cursor:pointer;
    position:relative;
    overflow:hidden;
    transition:.35s ease;
    box-shadow:
    0 10px 25px rgba(59,130,246,.35),
    inset 1px 1px 4px rgba(255,255,255,.35);
}

.verify-btn::before{
    content:'';
    position:absolute;
    top:0;
    left:-100%;
    width:100%;
    height:100%;
    background:linear-gradient(90deg,transparent,rgba(255,255,255,.45),transparent);
    transition:.6s;
}

.verify-btn:hover::before{
    left:100%;
}

.verify-btn:hover{
    transform:translateY(-4px);
    box-shadow:
    0 18px 35px rgba(99,102,241,.45),
    0 0 30px rgba(59,130,246,.3);
}

.timer{
    text-align:center;
    margin-top:22px;
    color:#94a3b8;
    font-size:14px;
}

.timer span{
    color:#60a5fa;
    font-weight:600;
}

.resend{
    text-align:center;
    margin-top:18px;
}

.resend a{
    text-decoration:none;
    color:#60a5fa;
    font-weight:500;
    transition:.3s;
}

.resend a:hover{
    color:#93c5fd;
    text-shadow:0 0 10px rgba(96,165,250,.8);
}

.success{
    margin-top:22px;
    background:rgba(34,197,94,.12);
    border:1px solid rgba(34,197,94,.3);
    color:#4ade80;
    padding:14px;
    border-radius:16px;
    text-align:center;
    display:none;
    animation:popup .45s ease;
}

@keyframes popup{
    from{
        opacity:0;
        transform:translateY(15px) scale(.9);
    }
    to{
        opacity:1;
        transform:translateY(0) scale(1);
    }
}

@media(max-width:500px){

.container{
    width:92%;
    padding:35px 20px;
}

.otp-box{
    gap:8px;
}

.otp-box input{
    width:52px;
    height:62px;
    font-size:22px;
}

}

const inputs=document.querySelectorAll('.otp-box input');
const button=document.querySelector('.verify-btn');
const success=document.getElementById('successMsg');

inputs.forEach((input,index)=>{

input.addEventListener('input',()=>{

input.value=input.value.replace(/[^0-9]/g,'');

if(input.value && index<inputs.length-1){
            inputs[index+1].focus();
        }

});

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

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

});

button.addEventListener('click',()=>{

let otp='';

inputs.forEach(input=>{
        otp+=input.value;
    });

if(otp.length===6){

button.innerHTML='Verified ✓';
        button.style.background='linear-gradient(135deg,#22c55e,#16a34a)';
        success.style.display='block';

}else{

button.innerHTML='Invalid OTP';
        button.style.background='linear-gradient(135deg,#ef4444,#dc2626)';

setTimeout(()=>{
            button.innerHTML='Verify OTP';
            button.style.background='linear-gradient(135deg,#3b82f6,#8b5cf6)';
        },1800);

}

});

let count=30;
const countdown=document.getElementById('countdown');

const timer=setInterval(()=>{

count--;
    countdown.innerHTML=count;

if(count<=0){
        clearInterval(timer);
        countdown.innerHTML='0';
    }

},1000);

- Embossed OTP UI

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