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

body{
    display:flex;
    justify-content:center;
    align-items:center;
    min-height:100vh;
    background:linear-gradient(135deg,#0f172a,#1e293b);
}

.container{
    width:90%;
    max-width:700px;
    text-align:center;
    background:rgba(255,255,255,0.08);
    backdrop-filter:blur(10px);
    border-radius:20px;
    padding:40px;
    box-shadow:0 0 25px rgba(0,170,255,.3);
}

h1{
    color:#38bdf8;
    margin-bottom:30px;
    font-size:40px;
}

.clock{
    display:flex;
    justify-content:center;
    gap:20px;
    flex-wrap:wrap;
}

.box{
    width:140px;
    height:140px;
    background:#1e293b;
    border-radius:15px;
    display:flex;
    flex-direction:column;
    justify-content:center;
    align-items:center;
    color:#fff;
    box-shadow:0 0 15px rgba(0,191,255,.25);
}

.box span{
    font-size:50px;
    font-weight:700;
}

.box p{
    margin-top:10px;
    color:#cbd5e1;
}

.date{
    margin-top:30px;
    color:#fff;
    font-size:22px;
}

.back-btn{
    display:inline-block;
    margin-top:30px;
    padding:12px 25px;
    background:#38bdf8;
    color:#fff;
    text-decoration:none;
    border-radius:10px;
    transition:.3s;
    font-weight:600;
}

.back-btn:hover{
    background:#0ea5e9;
}

@media(max-width:768px){

.clock{
    gap:15px;
}

.box{
    width:110px;
    height:110px;
}

.box span{
    font-size:38px;
}

h1{
    font-size:32px;
}

}

@media(max-width:480px){

.container{
    padding:25px;
}

.box{
    width:90px;
    height:90px;
}

.box span{
    font-size:30px;
}

.date{
    font-size:18px;
}

}