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

body{
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background:
        radial-gradient(circle at 14% 18%, rgba(182,75,85,.16), transparent 28%),
        radial-gradient(circle at 84% 76%, rgba(52,79,110,.24), transparent 31%),
        linear-gradient(135deg, #ffffff 0%, #f4f7fb 48%, #edf2f7 100%);
    color: #344f6e;
}

.back-site{
    position: fixed;
    top: 24px;
    left: 28px;
    z-index: 20;
    min-height: 40px;
    padding: 0 16px;
    border: 1px solid rgba(52,79,110,.26);
    border-radius: 999px;
    background: rgba(255,255,255,.88);
    color: #344f6e;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 13px;
    font-weight: 600;
    backdrop-filter: blur(10px);
}

.container{
    position: relative;
    width: 750px;
    height: 450px;
    border: 1px solid rgba(52,79,110,.48);
    background: #ffffff;
    box-shadow: 0 28px 70px rgba(38,61,87,.18);
    overflow: hidden;
}

.container .form-box{
    position: absolute;
    top: 0;
    width: 50%;
    height: 100%;
    display: flex;
    justify-content: center;
    flex-direction: column;
    color: #344f6e;
}

.form-box.Login{
    left: 0;
    padding: 0 40px;
}

.form-box.Login .animation{
    transform: translateX(0%);
    transition: .7s;
    opacity: 1;
    transition-delay: calc(.1s * var(--S));
}

.container.active .form-box.Login .animation{
    transform: translateX(-120%);
    opacity: 0;
    transition-delay: calc(.1s * var(--D));
}

.form-box.Register{
    right: 0;
    padding: 0 60px;
}

.form-box.Register .animation{
    transform: translateX(120%);
    transition: .7s ease;
    opacity: 0;
    filter: blur(10px);
    transition-delay: calc(.1s * var(--S));
}

.container.active .form-box.Register .animation{
    transform: translateX(0%);
    opacity: 1;
    filter: blur(0px);
    transition-delay: calc(.1s * var(--li));
}

.form-box h2{
    font-size: 34px;
    text-align: center;
    color: #344f6e;
}

.form-box .input-box{
    position: relative;
    width: 100%;
    height: 50px;
    margin-top: 25px;
}

.input-box input{
    width: 100%;
    height: 100%;
    background: transparent;
    border: none;
    outline: none;
    font-size: 16px;
    color: #344f6e;
    font-weight: 600;
    border-bottom: 2px solid #344f6e;
    padding-right: 23px;
    transition: .5s;
}

.input-box input:focus,
.input-box input:valid{
    border-bottom: 2px solid #344f6e;
}

.input-box label{
    position: absolute;
    top: 50%;
    left: 0;
    transform: translateY(-50%);
    font-size: 15px;
    color: #344f6e;
    transition: .5s;
}

.input-box input:focus ~ label,
.input-box input:valid ~ label{
    top: -5px;
    color: #344f6e;
}

.input-box box-icon{
    position: absolute;
    top: 50%;
    right: 0;
    font-size: 18px;
    transform: translateY(-50%);
    color: #344f6e;
}

.input-box input:focus ~ box-icon,
.input-box input:valid ~ box-icon{
    color: #344f6e;
}

.btn{
    position: relative;
    width: 100%;
    height: 45px;
    background: transparent;
    border-radius: 40px;
    cursor: pointer;
    font-size: 16px;
    font-weight: 600;
    border: 1px solid rgba(52,79,110,.48);
    overflow: hidden;
    z-index: 1;
    color: #344f6e;
}

.btn::before{
    content: "";
    position: absolute;
    height: 300%;
    width: 100%;
    background: linear-gradient(#ffffff, #b64b55, #ffffff, #344f6e);
    top: -100%;
    left: 0;
    z-index: -1;
    transition: .5s;
}

.btn:hover{
    color: #fff;
}

.btn:hover:before{
    top: 0;
}

.regi-link{
    font-size: 14px;
    text-align: center;
    margin: 20px 0 10px;
    color: #344f6e;
}

.regi-link a{
    text-decoration: none;
    color: #344f6e;
    font-weight: 700;
}

.regi-link a:hover{
    text-decoration: underline;
}

.info-content{
    position: absolute;
    top: 0;
    height: 100%;
    width: 50%;
    display: flex;
    justify-content: center;
    flex-direction: column;
    color: #fff;
}

.info-content.Login{
    right: 0;
    text-align: right;
    padding: 0 40px 60px 150px;
}

.info-content.Login .animation{
    transform: translateX(0);
    transition: .7s ease;
    transition-delay: calc(.1s * var(--S));
    opacity: 1;
    filter: blur(0px);
}

.container.active .info-content.Login .animation{
    transform: translateX(120%);
    opacity: 0;
    filter: blur(10px);
    transition-delay: calc(.1s * var(--D));
}

.info-content.Register{
    left: 0;
    text-align: left;
    padding: 0 150px 60px 38px;
    pointer-events: none;
}

.info-content.Register .animation{
    transform: translateX(-120%);
    transition: .7s ease;
    opacity: 0;
    filter: blur(10PX);
    transition-delay: calc(.1s * var(--S));
}

.container.active .info-content.Register .animation{
    transform: translateX(0%);
    opacity: 1;
    filter: blur(0);
    transition-delay: calc(.1s * var(--li));
}

.info-content h2{
    text-transform: none;
    font-size: 34px;
    line-height: 1.3;
    color: #fff;
}

.info-content p{
    font-size: 14px;
    line-height: 1.9;
    color: rgba(255,255,255,.82);
}

.container .curved-shape{
    position: absolute;
    right: 0;
    top: -5px;
    height: 600px;
    width: 850px;
    background: linear-gradient(45deg, #b64b55, #344f6e);
    transform: rotate(10deg) skewY(40deg);
    transform-origin: bottom right;
    transition: 1.5s ease;
    transition-delay: 1.6s;
}

.container.active .curved-shape{
    transform: rotate(0deg) skewY(0deg);
    transition-delay: .5s;
}

.container .curved-shape2{
    position: absolute;
    left: 250px;
    top: 100%;
    height: 700px;
    width: 850px;
    background: #ffffff;
    border-top: 3px solid #b64b55;
    transform: rotate(0deg) skewY(0deg);
    transform-origin: bottom left;
    transition: 1.5s ease;
    transition-delay: .5s;
}

.container.active .curved-shape2{
    transform: rotate(-11deg) skewY(-41deg);
    transition-delay: 1.2s;
}

@media (max-width: 820px){
    body{ padding: 90px 18px 30px; align-items: flex-start; }
    .container{ transform-origin: top center; transform: scale(.88); }
}

@media (max-width: 690px){
    .container{ transform: scale(.72); margin-inline: -100px; }
    .back-site{ top: 18px; left: 18px; }
}