:root, :root.light {
    --img-main: url("style/background_light.png");
    --col-main-bg: #FFF;
    --col-main-text: #000;

    --img-head: url("style/header_light.jpg");
    --col-head: #FFF;

    --col-grad1: #97C767;
    --col-grad2: #458819;
    --col-grad3: #88B858;

    --col-shadow: #444;

    --col-button: #F2F0EB;
    --col-border: #E7E5E0;
    --col-hover: #72AB44;

    --col-down-bg: #1F1F1F;
    --col-down-text1: #EFEFEF;
    --col-down-text2: #A4A4A4;
    --col-down-sep: #555;
}
:root.dark {
    --img-main: url("style/background_dark.png");
    --col-main-bg: #33322C;
    --col-main-text: #DDD;

    --img-head: url("style/header_dark.jpg");
    --col-head: #AAA;

    --col-grad1: #1d1c15;
    --col-grad2: #18160d;
    --col-grad3: #1a1a15;

    --col-shadow: #666;

    --col-button: #1F1F1F;
    --col-border: #444;
    --col-hover: #72AB44;

    --col-down-bg: #1F1F1F;
    --col-down-text1: #EFEFEF;
    --col-down-text2: #A4A4A4;
    --col-down-sep: #555;
}

@media (prefers-color-scheme: dark) {
    :root {
        --img-main: url("style/background_dark.png");
        --col-main-bg: #33322C;
        --col-main-text: #DDD;

        --img-head: url("style/header_dark.jpg");
        --col-head: #AAA;

        --col-grad1: #1d1c15;
        --col-grad2: #18160d;
        --col-grad3: #1a1a15;

        --col-shadow: #666;

        --col-button: #1F1F1F;
        --col-border: #444;
        --col-hover: #72AB44;

        --col-down-bg: #1F1F1F;
        --col-down-text1: #EFEFEF;
        --col-down-text2: #A4A4A4;
        --col-down-sep: #555;
    }
}

* {
    box-sizing: border-box;
} 

@font-face {
    font-family: Fira;
    src: url("style/font/FiraMono-Medium.otf") format("opentype");
}
@font-face {
    font-family: Fira;
    font-weight: bold;
    src: url("style/font/FiraMono-Bold.otf") format("opentype");
}

html {
    scroll-behavior: smooth;

    min-height: 100%;
    display: flex;
    flex-direction: column;
}

body {
    flex-grow: 1;
    position: relative;

    margin: 0px;
    padding: 0px;

    background: var(--col-grad1);
    background: linear-gradient(45deg, var(--col-grad1) 0%,var(--col-grad2) 51%,var(--col-grad3) 100%);
    background: var(--img-main), linear-gradient(45deg, var(--col-grad1) 0%,var(--col-grad2) 51%,var(--col-grad3) 100%);

    font: normal 12pt Fira, Arial;
    text-align: center;
    color: var(--col-main-text);
}

#site_header {
    margin: 0px;
    padding: 70px 0px;
    background-color: var(--col-main-bg);
    background: var(--col-main-bg) top center var(--img-head) no-repeat;
    font-size: 12pt;
}
#site_header span {
    display: inline-block;
    padding: 15px 30px;
    font-size: 20pt;
    font-weight: bold;
    letter-spacing: 10px;
    vertical-align: baseline;
    color: var(--col-head);
    background: linear-gradient(45deg, var(--col-grad1) 0%,var(--col-grad2) 51%,var(--col-grad3) 100%);
    box-shadow: 0px 0px 5px 1px var(--col-shadow);
}

#site_info {
    margin: 0px;
    padding: 30px 0px;
}
#site_info span {
    display: inline-block;
    font-size: 12pt;
    line-height: 26px;
}

#site_menu {
    margin: 0px;
    padding: 10px 0px;
    background-color: var(--col-main-bg);
}
#site_menu a {
    display: inline-block;
    margin: 5px 5px;
    width: 370px;
    text-decoration: none;
    color: var(--col-main-text);
    border: 5px solid var(--col-main-bg);
    border-radius: 10px;
}
#site_menu a:hover {
    border: 5px solid var(--col-hover);
}
#site_menu table td {
    text-align: left;
}
#site_menu table td.top {
    font-size: 15pt;
    vertical-align: bottom;
}
#site_menu table td.bottom {
    font-size: 11pt;
    vertical-align: top;
}
#site_menu div {
    width: 79px;
    height: 79px;
    background-color: var(--col-button);
    border: 2px solid var(--col-border);
    border-radius: 40px;
    background: var(--col-button) center center url("style/menu/menu.png") no-repeat;
}

#site_caption {
    scroll-margin-top: 50px;
    margin: 60px auto;
    width: 500px;
    font-size: 16pt;
    font-weight: bold;
    line-height: 40px;
    text-transform: uppercase;
    letter-spacing: 3px;
    border-top: 1px solid var(--col-main-text);
    border-bottom: 1px solid var(--col-main-text);
}

/* Switch Color-Scheme button */

div.color_scheme {
    position: sticky;
    top: 20px;
    left: calc(100vw - 60px);
    width: 0px;
    height: 0px;
    overflow: visible;
}
div.color_scheme button {
    width: 39px;
    height: 39px;
    background: linear-gradient(135deg, var(--col-main-bg) 0%, var(--col-main-bg) 50%, var(--col-grad2) 50%, var(--col-grad2) 100%);
    border: 3px solid var(--col-border);
    border-radius: 60px;
    cursor: pointer;
}
div.color_scheme button:hover {
    border: 3px solid var(--col-down-bg);
}