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

body{
    background:#0f172a;
    color:#fff;
    font-family:Arial,sans-serif;
}

.container{
    width:90%;
    max-width:700px;
    margin:80px auto;
    text-align:center;
}

h1{
    margin-bottom:30px;
    font-size:32px;
}

form{
    display:flex;
    gap:10px;
    flex-wrap:wrap;
    justify-content:center;
}

input[type="url"]{
    flex:1;
    min-width:250px;
    padding:14px;
    border:none;
    border-radius:8px;
    outline:none;
    font-size:16px;
}

button{
    padding:14px 24px;
    border:none;
    border-radius:8px;
    background:#2563eb;
    color:#fff;
    cursor:pointer;
    font-size:16px;
}

button:hover{
    opacity:.9;
}

.message{
    margin-top:25px;
    padding:15px;
    border-radius:8px;
}

.error{
    background:#7f1d1d;
}

.success{
    background:#14532d;
}

.success input{
    width:100%;
    padding:12px;
    border:none;
    border-radius:6px;
    margin-top:10px;
    font-size:15px;
}