.header {
    position: fixed;
    top: 0;
    z-index: 10000;
    width: 100%;
    padding: 30px;
    background-color: #ffffffe0;
    backdrop-filter: blur(90px);
    border-bottom: solid 2px #C9C9C9;
}

.header__container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.header__logo a {
    display: flex;
    align-items: center;
    gap: 15px;
    font-family: "Gerhaus";
    color: #292929;
    letter-spacing: 2px;
    font-size: 20px;
    transition: 0.3s;
}

.header__logo a:hover {
    color: #494949;
}

.header__nav-ul {
    display: flex;
    gap: 30px;
}

.header__item {
    color: #000000;
    font-size: 28px;
}

.header__item::after {
    content: '';
    display: block;
    width: 0;
    height: 2px;
    background: linear-gradient(to right,
            #FF0040 20%,
            #e000a8 30%,
            #0190cd 70%,
            #139DFF 80%);
    background-size: 180% auto;
    animation: TextShine 3s ease-in-out infinite alternate;
    transition: 0.3s;
}

.header__item:hover {
    background: linear-gradient(to right,
            #FF0040 20%,
            #e000a8 30%,
            #0190cd 70%,
            #139DFF 80%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    text-fill-color: transparent;
    background-size: 180% auto;
    animation: TextShine 3s ease-in-out infinite alternate;
}

.header__item:hover::after {
    width: 100%;
}

.rainbow-button {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 200px;
    height: 60px;
    background: linear-gradient(to right, #FF0040, #1b7eff);
    color: #fff;
    border-radius: 12px;
    font-size: 20px;
    background-size: 120% auto;
    transition: 0.3s !important;
}

.rainbow-button:hover {
    transform: scale(1.1) !important;
    border-radius: 25px !important;
    background-position: 100%;
}

.header__burger-btn {
    display: none;
    position: relative;
    width: 60px;
    height: 60px;
    border: none;
    background-color: transparent;
    z-index: 3;
}


.header__burger-btn span {
    position: absolute;
    width: 40px;
    height: 5px;
    left: 10px;
    background-color: #242424;
    transition: transform 0.5s, opacity 0.5s;
}

.header__burger-btn span:nth-child(1) {
    transform: translateY(-12px);
}

.header__burger-btn span:nth-child(3) {
    transform: translateY(12px);
}

.header.open .header__burger-btn span:nth-child(2) {
    opacity: 0;
}

.header.open .header__burger-btn span:nth-child(1) {
    transform: rotate(45deg);
}

.header.open .header__burger-btn span:nth-child(3) {
    transform: rotate(-45deg);
}



@media screen and (max-width: 1500px) {
    /* header */
    .header__item {font-size: 25px;}
}


@media screen and (max-width: 1350px) {
    /* header */
    .header__burger-btn {
        display: block;
    }

    .header__button {
        display: none;
    }

    .header__nav {
        position: absolute;
        right: -600px;
        top: 0;
        width: 600px;
        height: auto;
        text-align: end;
        background-color: #fff;
        border-bottom: solid #292929 3px;
        transition: 0.5s;
    }

    .header__nav-ul {
        display: block;
        padding: 100px 50px 50px 20px;
    }

    .header__item {
        display: block;
        padding: 15px 0;
        font-size: 40px;
    }

    .header.open .header__nav {
        right: 0;
    }

    .header__item::after {
        content: none;
    }
}

@media screen and (max-width: 750px) {
    /* header  */
    .header__nav{
        right: -300px;
        width: 300px;
    }

    .header__item{font-size: 30px;}
}

@media screen and (max-width: 500px) {
    /* header  */
    .header {
        padding: 20px;
    }

    .header__logo h1{
        display: none;
    }

    .header__logo a {
        font-size: 15px;
    }

    .header__item {
        font-size: 25px;
    }
}