html {
	scroll-behavior: smooth;
}

:root{
    --main-color: #333;
    --sub-color: #FFF;
    --theme-color: #762F07;
    --background-color: #F5F5F5;
    --shadow-color: rgba(0,0,0,0.2);
    --default-font-family: "Zen Kaku Gothic New", sans-serif;
    --article-width: min(85vh, 50em);
    --index-width: 20em;
    --transition-time: 0.1s;
}

a{
    text-decoration: none;
    color: var(--theme-color);
}

#header > :not(.reverse) a{
    color: var(--main-color);
}

.reverse a{
    color: var(--sub-color);
}

a:hover{
    text-decoration: underline;
}

body{
    margin: 0;
    color: var(--main-color);
    font-family: var(--default-font-family);
    font-weight: 400;
    font-style: normal;
    background-color: var(--background-color);
}
.reverse{
    color: var(--sub-color);
    background-color: var(--theme-color);
}
.container{
    margin-left:auto;
    margin-right:auto;
}
.article{
    margin-right: 1em;
    width:var(--article-width);
    background-color: var(--sub-color);
    box-shadow: 0rem 0.2rem 0.2rem var(--shadow-color);
    padding:1em;
}
.row{
    width:100%;
    height:auto;
    display:flex;
    align-items: center;
    padding:0;
    font-size: large;
}
.flex-top{
    align-items: stretch;
}
#site_title{
    margin:0.5rem;
    width: 50%;
}
#header_menu{
    margin:0.5rem;
    width: 50%;
}
#header a{
    margin-left:1em;
    margin-right: 1em;
}
.left{
    text-align: left;
}
.right{
    text-align: right;
}
.shadow{
    box-shadow: 0rem 0.2rem 0.2rem var(--shadow-color);
}
.margin{
    margin-top: 0.5em;
    margin-bottom: 0.5em;
}

#page_title{
    background-color: var(--theme-color);
    color: var(--sub-color);
    height: 8em;
    background-size: cover;
    text-shadow:0 0 0.4rem #000, 0 0 0.5rem #000;
}

#title_img{
    width: 100%;
    height: 100%;
    object-position: center;
    background-position: center;
    filter: brightness(0.7) contrast(1.2);
    opacity: 1;
    transition: opacity 0.5s linear;
    background-size: cover;
}

#title_text{
    font-size: xx-large;
    width:fit-content;
    margin-left: auto;
    margin-right: auto;
    transform: translateY(-2em);
}

#index{
    margin-top: 1em;
    padding:1em;
    background-color: var(--sub-color);
    box-shadow: 0rem 0.2rem 0.2rem var(--shadow-color);
    max-height: 60vh;
    position: sticky;
    top: 1em;
    overflow-y: auto;
}

#index a{
    color: var(--main-color);
    transition: background-color var(--transition-time) linear;
    width:auto;
    display: block;
    padding: 0.5em;
}

#index a:hover{
    text-decoration: none;
    background-color: var(--background-color);
    border-radius: 0.5em;
}

#index_wrapper{
    width: var(--index-width);
    margin-left: 1em;
    margin-right: auto;
    margin-top: 0;
    margin-bottom: 0;
}

h1{
    border-bottom: 0.1rem solid var(--theme-color);
}

.center{
    text-align: center;
    margin-right: auto;
    margin-left: auto;
}

.footer{
    margin-top: 1em;
    margin-bottom: 1em;
}


.invisible{
    opacity: 0 !important;
}

@media screen and (max-width: 1260px){
    #index_wrapper{
        display: none;
    }
    .article{
        margin-right: auto;
    }
}