body{
    margin:0;
    min-height:100vh;
    overflow-x:hidden;
    font-family:Arial,sans-serif;
    color:#caf0f8;
    background-color:#2a2a72;
}

.background-area{
    min-height:100vh;
    position:relative;
    background-color:#2a2a72;
    overflow:hidden;
    margin-top:10px;
    padding-top:0;
}

.background-area::before{
    content:"";
    position:absolute;
    inset:0;
    background:
    repeating-linear-gradient(45deg,transparent 0,transparent 35px,rgba(255,255,255,0.15) 35px,rgba(255,255,255,0.15) 70px),
    repeating-linear-gradient(-45deg,transparent 0,transparent 35px,rgba(255,255,255,0.15) 35px,rgba(255,255,255,0.15) 70px),
    linear-gradient(90deg,#009ffd,#2a2a72);
    z-index:0;
}

.wrapper{
    --input-focus:#00b4d8;
    --font-color:#caf0f8;
    --font-color-sub:#90e0ef;
    --bg-color:#023e8a;
    --bg-color-alt:#0077b6;
    --main-color:#caf0f8;
    display:flex;
    justify-content:center;
    align-items:center;
    padding-top:120px;
    position:relative;
    z-index:1;
}

.switch{
    transform:translateY(-60px);
    position:relative;
    display:flex;
    flex-direction:column;
    justify-content:center;
    align-items:center;
    gap:30px;
    width:50px;
    height:20px;
}

.card-side::before{
    position:absolute;
    content:'Log in';
    left:-70px;
    top:0;
    width:100px;
    text-decoration:underline;
    color:var(--font-color);
    font-weight:600;
}

.card-side::after{
    position:absolute;
    content:'Sign up';
    left:70px;
    top:0;
    width:100px;
    text-decoration:none;
    color:var(--font-color);
    font-weight:600;
}

.toggle{
    opacity:0;
    width:0;
    height:0;
}

.slider{
    box-sizing:border-box;
    border-radius:5px;
    border:2px solid var(--main-color);
    box-shadow:4px 4px var(--main-color);
    position:absolute;
    cursor:pointer;
    top:0;left:0;right:0;bottom:0;
    background-color:#0077b6;
    transition:0.3s;
}

.slider:before{
    box-sizing:border-box;
    position:absolute;
    content:"";
    height:20px;
    width:20px;
    border:2px solid var(--main-color);
    border-radius:5px;
    left:-2px;
    bottom:2px;
    background-color:#023e8a;
    box-shadow:0 3px 0 var(--main-color);
    transition:0.3s;
}

.toggle:checked + .slider{background-color:var(--input-focus);}
.toggle:checked + .slider:before{transform:translateX(30px);}
.toggle:checked ~ .card-side:before{text-decoration:none;}
.toggle:checked ~ .card-side:after{text-decoration:underline;}

.flip-card__inner{
    width:320px;
    height:420px;
    position:relative;
    background-color:transparent;
    perspective:1000px;
    text-align:center;
    transition:transform 0.8s;
    transform-style:preserve-3d;
}

.toggle:checked ~ .flip-card__inner{transform:rotateY(180deg);}
.toggle:checked ~ .flip-card__front{box-shadow:none;}

.flip-card__front,
.flip-card__back{
    padding:20px;
    position:absolute;
    display:flex;
    flex-direction:column;
    justify-content:center;
    backface-visibility:hidden;
    background:linear-gradient(135deg,#0077b6,#023e8a);
    gap:20px;
    border-radius:20px;
    border:2px solid var(--main-color);
    box-shadow:6px 6px var(--main-color);
}

.flip-card__back{
    width:100%;
    transform:rotateY(180deg);
}

.flip-card__form{
    display:flex;
    flex-direction:column;
    align-items:center;
    gap:20px;
}

.title{
    margin:20px 0;
    font-size:28px;
    font-weight:900;
    text-align:center;
    color:#caf0f8;
}

.flip-card__input{
    width:250px;
    height:40px;
    border-radius:10px;
    border:2px solid var(--main-color);
    background-color:#034078;
    box-shadow:4px 4px var(--main-color);
    font-size:15px;
    font-weight:600;
    color:#caf0f8;
    padding:5px 10px;
    outline:none;
}

.flip-card__input::placeholder{
    color:#90e0ef;
    opacity:0.8;
}

.flip-card__input:focus{border:2px solid var(--input-focus);}

.flip-card__btn{
    margin:20px 0;
    width:120px;
    height:40px;
    border-radius:10px;
    border:2px solid var(--main-color);
    background-color:#00b4d8;
    box-shadow:4px 4px var(--main-color);
    font-size:17px;
    font-weight:600;
    color:#023e8a;
    cursor:pointer;
    transition:0.3s;
}

.flip-card__btn:hover{background-color:#90e0ef;}
.flip-card__btn:active{
    box-shadow:0px 0px var(--main-color);
    transform:translate(3px,3px);
}

h1{
    text-align:center;
    color:#90e0ef;
    margin:0;
    font-size:48px;
    padding-top:15px;
    position:relative;
    z-index:1;
}

.inline-msg{
    display:none;
    font-size:13px;
    font-weight:600;
    margin:0;
    padding:8px 12px;
    border-radius:8px;
    background:#034078;
    border:1px solid #90e0ef55;
    text-align:center;
    width:230px;
}