* {
    padding: 0;
    margin: 0;
}

:root {
    --main-bg-color: #f5f5ff;
    /*--main-dark-bg-color: #ddf;*/
    --main-dark-bg-color: #e5e5ff;
    --inf-bg-color: rgba(255,255,255,.7);
    --main-txt-color: #000;
    --header-bg-color: rgba(255,255,255,0.5);
    --header-txt-rgb: 0, 0, 0;
    --footer-txt-color: #7d77a0;
    --border-vis: solid 1px rgba(20, 0, 170, 0.15);
    --border-vis-h1: solid 1.1px rgba(30, 0, 100, 0.15);
    --header-hover-shadow: 0 0 1px;
    --inf-button-bg-color: #88f;
    --inf-button-text-color: #fff;
    --inf-button-light-bg-color:#aaf;
    --inf-button-shadow: 0 1px 5px rgba(0,0,0,0.2);
    --inf-button-shadow-hover: 0 0 5px rgba(100,100,255,0.65);
    --inf-p-text-color: rgba(0,0,0,.7);
    --inf-keywords-text-shadow: 0 0 5px rgba(60,0,255,0.3);
}

@keyframes Button {
    0%{
        background-position: left;
    }
    70%{
        background-position: right;
    }
    100%{
        background-position: right;
    }
}

body {
    font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    margin: 0; /* Убирает возможные отступы у body */
    height: 100%; /* Устанавливает высоту body на всю видимую область */
    background: var(--main-bg-color); 
    background-size: cover;
}


header {
    /*text-align: center;*/
    padding: 10px 0;
    /*background-color: var(--header-bg-color);
    box-shadow: 0px 0px 5px rgba(0,0,0,0.1);
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);*/
    position: fixed;
    width: 100%;
    margin: 0;
    top: 0;
    z-index: 10;
    align-items: center;
    justify-content: space-evenly;
    display: flex;
    background-image: linear-gradient(to top, rgba(255,255,255,0.0001), var(--main-bg-color));
}

.header-a {
    position: relative;
    text-decoration: none;
    color: rgba(var(--header-txt-rgb), .9);
    font-weight: bold;
    -webkit-tap-highlight-color: transparent;
    transition: .2s;
/*
    background-color: var(--header-bg-color);
    box-shadow: 0px 0px 5px rgba(0,0,0,0.1);
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);*/
    padding: 0.7rem;
    box-shadow: 0px 2px 5px rgba(0,0,0,0.08);
    border-radius: var(--block-border-radius);
    background-color: rgba(225,225,255,0.4);

    border-top: solid 1px rgba(255,255,255,0.5);

    text-shadow: 0 0 3px #fff;
}

.header-a::before {
    content: "";
    border-radius: var(--block-border-radius);
    position: absolute;
    inset: 0;

    border-bottom: solid 1px rgba(255,255,255,0.5);
}

.header-a:hover {
    color: rgba(var(--header-txt-rgb), 1);
    text-shadow: var(--header-hover-shadow) rgba(var(--header-txt-rgb), 1);
}

.blur-layer-1::before {
    background-image: linear-gradient(rgba(0,0,0,0.15),rgba(0,0,0,0.08));
}

.div-contacts.mouseHover {
    background-color: red;
}

#infAllArea {
    margin-top: 55px;
    padding-bottom: 40px;
    justify-content: flex;
}

.inf {
    margin: 10px;
    padding: 10px;
    background: var(--inf-bg-color);
    border-radius: 10px;
    border: var(--border-vis);
    color: var(--main-txt-color); 
    box-shadow: 0px 2px 5px rgba(0,0,0,0.15);
    background-size: 500%;
    /* backdrop-filter: blur(1px); */
}

.inf h2 {
    border-bottom: var(--border-vis-h1);
    padding: 3px 5px;
}

.inf p {
    color: var(--inf-p-text-color);
    padding: 3px 2px;
}

.inf button {
    font-family: 'Inter', sans-serif;
    font-size: 14px;
    font-weight: 700;
    padding: 5px 10px;
    border-radius: 30px;
    border: var(--border-vis);
    background: linear-gradient(90deg, var(--inf-button-bg-color) ,var(--inf-button-bg-color),var(--inf-button-bg-color),var(--inf-button-light-bg-color),var(--inf-button-bg-color),var(--inf-button-bg-color), var(--inf-button-bg-color));
    background-size: 300%;
    box-shadow: var(--inf-button-shadow);
    color: var(--inf-button-text-color);
    margin-top: 5px;
    animation: Button 4s infinite;
    transition: .2s;
    opacity: .8;
}

.inf button:hover {
    background-position: center;
    box-shadow: var(--inf-button-shadow-hover);
    opacity: 1;
    /*background-color: var(--inf-button-light-bg-color);*/
}



#footer {
    /* background: var(--main-dark-bg-color); */
    background-color: var(--header-bg-color);
    /* color: var(--footer-txt-color); */
    color: rgba(var(--header-txt-rgb), .6); 
    box-shadow: 0px 0px 5px rgba(0,0,0,0.08);
    text-align: center;
    padding: 10px 0;
    /* border-top: var(--border-vis-h1); */
    font-weight: 900;
    bottom: 0;
    position: fixed;
    width: 100%;
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);
}

#mainH1 {
    color: var(--main-txt-color);
    padding: 8px 20px;
}

#mainH2 {
    color: var(--main-txt-color);
    padding: 6px 20px;
}

#keywords {
    color: var(--main-txt-color);
    text-shadow: var(--inf-keywords-text-shadow);
}

.question-arr {
    position: fixed;
    z-index: 99;
    top: 0;
    width: 100%;
    height: 100%;
    backdrop-filter: blur(10px);
    background-color: rgba(0,0,0,0.3);
    display: none;
    align-items: center;
    transition: 0.5s;
    opacity: 0;
}

.question-arr.show {
    opacity: 1;
}


.btn-arr {
    display: flex;
    justify-content: space-evenly;
}



@media (prefers-color-scheme: dark) {
    :root {
        --main-bg-color: #131325;
        --main-dark-bg-color: #000;
        --inf-bg-color: rgba(50, 47, 85, .6);
        --main-txt-color: #fff;
        --header-bg-color: rgba(0,0,0,0.5);
        --header-txt-rgb: 255, 255, 255;
        --border-vis: solid 1px rgba(170,150,255,0.15);
        --border-vis-h1: solid 1.1px rgba(200,200,255,0.1);
        --inf-button-text-color: #000;
        --inf-p-text-color: rgba(255,255,255,.7);
        --inf-keywords-text-shadow: 0 0 10px rgba(60,0,255,0.8);
    }

    .header-a {
        box-shadow: 0px 3px 10px rgba(0,0,0,0.25);
    }

    .header-p {
        text-shadow: 0 0 4px rgba(0,0,0,1);
    }

    header {
        background-image: linear-gradient(to top, rgba(255,255,255,0.0001), var(--main-bg-color));
    }

    .header-a {
        box-shadow: 0px 3px 10px rgba(0,0,0,0.4);
        background-color: rgba(35,35,55,0.4);

        border-top: solid 1px rgba(155,155,255,0.3);

        text-shadow: 0 0 3px #000;
    }

    .header-a::before {
        content: "";
        border-radius: var(--block-border-radius);
        position: absolute;
        inset: 0;

        border-bottom: solid 1px rgba(155,155,255,0.3);
    }

    .header-a:hover {
        color: rgba(var(--header-txt-rgb), 1);
        text-shadow: var(--header-hover-shadow) rgba(var(--header-txt-rgb), 1);
    }

    .blur-layer-1::before {
        background-image: linear-gradient(rgba(255,255,255,0.1),rgba(255,255,255,0.1));
    }


    #infAllArea {
        margin-top: 55px;
        padding-bottom: 40px;
        justify-content: flex;
    }

    .inf {
        margin: 10px;
        padding: 10px;
        background: var(--inf-bg-color);
        border-radius: 10px;
        border: var(--border-vis);
        color: var(--main-txt-color); 
        box-shadow: 0px 2px 5px rgba(0,0,0,0.15);
        background-size: 500%;
        /* backdrop-filter: blur(1px); */
    }

    .inf h2 {
        border-bottom: var(--border-vis-h1);
        padding: 3px 5px;
    }

    .inf p {
        color: var(--inf-p-text-color);
        padding: 3px 2px;
    }

    .inf button {
        font-family: 'Inter', sans-serif;
        font-size: 14px;
        font-weight: 700;
        padding: 5px 10px;
        border-radius: 30px;
        border: var(--border-vis);
        background: linear-gradient(90deg, var(--inf-button-bg-color) ,var(--inf-button-bg-color),var(--inf-button-bg-color),var(--inf-button-light-bg-color),var(--inf-button-bg-color),var(--inf-button-bg-color), var(--inf-button-bg-color));
        background-size: 300%;
        box-shadow: var(--inf-button-shadow);
        color: var(--inf-button-text-color);
        margin-top: 5px;
        animation: Button 4s infinite;
        transition: .2s;
        opacity: .8;
    }

    .inf button:hover {
        background-position: center;
        box-shadow: var(--inf-button-shadow-hover);
        opacity: 1;
        /*background-color: var(--inf-button-light-bg-color);*/
    }



    #footer {
        /* background: var(--main-dark-bg-color); */
        background-color: var(--header-bg-color);
        /* color: var(--footer-txt-color); */
        color: rgba(var(--header-txt-rgb), .6); 
        box-shadow: 0px 0px 5px rgba(0,0,0,0.08);
        text-align: center;
        padding: 10px 0;
        /* border-top: var(--border-vis-h1); */
        font-weight: 900;
        bottom: 0;
        position: fixed;
        width: 100%;
        -webkit-backdrop-filter: blur(10px);
        backdrop-filter: blur(10px);
    }

    #mainH1 {
        color: var(--main-txt-color);
        padding: 8px 20px;
    }

    #mainH2 {
        color: var(--main-txt-color);
        padding: 6px 20px;
    }

    #keywords {
        color: var(--main-txt-color);
        text-shadow: var(--inf-keywords-text-shadow);
    }
}