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

body{
    min-height:100vh;
    display:flex;
    justify-content:center;
    align-items:center;
    background:linear-gradient(135deg,#15a9d6,#67c4f0);
    overflow:hidden;
    position:relative;
}

/* Background Effect */
body::before{
    content:'';
    position:absolute;
    width:600px;
    height:600px;
    border-radius:50%;
    background:rgba(255,255,255,.08);
    right:-200px;
    top:50%;
    transform:translateY(-50%);
}

.wave{
    position:absolute;
    bottom:0;
    left:0;
    width:100%;
    height:180px;
    background:rgba(255,255,255,.25);
    border-radius:100% 100% 0 0;
}

.card-404{
    position:relative;
    z-index:2;
    width:90%;
    max-width:750px;
    background:#fff;
    border-radius:25px;
    padding:50px;
    text-align:center;
    box-shadow:0 20px 50px rgba(0,0,0,.15);
}

.logo{
    width:90px;
    margin:auto;
    margin-bottom:20px;
}

.logo img{
    width:100%;
}

.error-title{
    font-size:72px;
    font-weight:900;
    color:#082a63;
    margin-bottom:10px;
}

.sub-title{
    color:#2c78ff;
    font-size:24px;
    font-weight:700;
    margin-bottom:25px;
    position:relative;
}

.sub-title:before,
.sub-title:after{
    content:'';
    position:absolute;
    top:50%;
    width:120px;
    height:2px;
    background:#c7dafc;
}

.sub-title:before{
    left:0;
}

.sub-title:after{
    right:0;
}

.desc{
    font-size:20px;
    color:#666;
    line-height:1.6;
    margin-bottom:35px;
}

.btn-home{
    display:inline-flex;
    align-items:center;
    gap:10px;
    padding:15px 35px;
    background:linear-gradient(90deg,#126cff,#2d8cff);
    color:#fff;
    text-decoration:none;
    border-radius:12px;
    font-size:20px;
    font-weight:600;
    transition:.3s;
}

.btn-home:hover{
    transform:translateY(-3px);
    box-shadow:0 10px 25px rgba(18,108,255,.4);
}

.footer-text{
    margin-top:30px;
    color:#777;
    font-size:14px;
}

.footer-text a{
    color:#126cff;
    text-decoration:none;
    font-weight:600;
}

.dot{
    position:absolute;
    width:120px;
    height:120px;
    background-image:radial-gradient(rgba(255,255,255,.5) 2px, transparent 2px);
    background-size:25px 25px;
}

.dot-left{
    top:20%;
    left:7%;
}

.dot-right{
    bottom:18%;
    right:8%;
}

@media(max-width:768px){

    .card-404{
        padding:35px 20px;
    }

    .error-title{
        font-size:50px;
    }

    .sub-title{
        font-size:18px;
    }

    .sub-title:before,
    .sub-title:after{
        width:60px;
    }

    .desc{
        font-size:16px;
    }

    .btn-home{
        width:100%;
        justify-content:center;
    }
}