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

body{
    height:100vh;
    display:flex;
    justify-content:center;
    align-items:center;
    background:#c9d6df;
}

/* CONTAINER GLASS */
.container{
    width:360px;
    height:480px;
    padding:20px;
    border-radius:20px;
    color:white;
    position:relative;
    overflow:hidden;

    background: rgba(0,39,46,0.8);
    box-shadow:0 10px 30px rgba(0,0,0,0.3);
}

/* TAB */
.tab{
    display:flex;
    background:#2f3640;
    border-radius:20px;
    margin-bottom:20px;
}

.tab button{
    flex: 1;
    padding:10px;
    border:none;
    background:none;
    color:white;
    cursor:pointer;
    border-radius:20px;
    transition:0.3s;
}

.tab button:hover{
    transform: translateY(-3px) scale(1.05);
    box-shadow:0 15px 15px rgba(0,0,0,0.4);
}

.tab .active{
    background: linear-gradient(to left,#FBC2EB ,red,#FBC2EB);
    box-shadow:0 0 30px rgba(255,110,196,0.5),
               0 20px 30px rgba(106,90,249,0.5);
}

/* FORM */
.form{
    display:none;
    flex-direction:column;
}

.form.active{
    display:flex;
}

.form h2{
    margin-bottom:20px;
}

/* INPUT */
.form input{
    margin-bottom:15px;
    padding:12px;
    border:none;
    border-radius:10px;
    background:#2f3640;
    color:white;
    transition:0.3s;
}

.form input:focus{
    outline:none;
    box-shadow:0 0 0 2px #6a5af9;
    background: #FBC2EB;
}

/* BUTTON */
.btn{
    padding:12px;
    border:none;
    border-radius:20px;
    color:white;
    cursor:pointer;

   background: linear-gradient(to left,#FBC2EB ,red,#FBC2EB);
   background-position: right;
    background-size:200% 200%;
    transition:0.4s;
}

.btn:hover{
    background-position: left;
    transform:scale(1.05);
    box-shadow:0 0 30px rgba(255,110,196,0.5),
               0 20px 30px rgba(106,90,249,0.5);
    opacity:0.7;
}

/* BACK TEXT */
.back{
    margin-top:10px;
    font-size:14px;
    cursor:pointer;
    color:#ccc;
}