html {
    height: 100%;
}

body {
    background-color: #fff;
    background-image: url(images/bg_ecb_basic.jpg);
    background-position: top;
    background-repeat:repeat-x;
    font-family: "Lucida Grande", "Hiragino Kaku Gothic Pro", "ヒラギノ角ゴ Pro W3", "ＭＳ Ｐゴシック", Geneva, Arial, Verdana, sans-serif;
    font-size: 62.5%;
    height: 100%;
}

a:link {
    color: #333;
    text-decoration: none;
    font-weight: 700;
}

a:visited {
    color: #333;
}

a:hover {
    text-decoration: underline;
    color: #1d2e4c;
    opacity: 0.7;
}

* {
    box-sizing: border-box;
}

#main_header {
    color: #3047a0;
}

#main_content {
    width: 100vw;
    max-width: 1000px;
    min-height: 100%;
    background-color: #fff;
    margin: auto;
    height: auto;
    color: #333;
    font-size: 1rem;
    padding: 0;
}

#main_navi {
    margin-left: auto;
    margin-right: auto;
    width: 100vw;
    max-width: 950px;
    padding: 0.5rem;
    font-weight: bold;
    font-family: "Lucida Grande", "Hiragino Kaku Gothic Pro", "ヒラギノ角ゴ Pro W3", "ＭＳ Ｐゴシック", Geneva, Arial, Verdana, sans-serif;
    font-size: 1rem;
}

h1 {
    font-size: 1.5em;
    text-align: center;
}

div.key_visual {
    width: 90%;
    margin-inline: auto;
    text-align: center;
}

img.gr_title_top {
    width: 85%;
    max-width: 900px;
    margin-top: 1rem;
    margin-bottom: 0.5rem;
}

div.top_catch {
    margin-inline: auto;
    text-align: center;
}

h2 {
    width: 90%;
    margin-inline: auto;
    font-size: 1.3rem;
    font-weight:600;
    line-height: 2.6rem;
    text-align: left;
    margin-top: 3rem;
    border-bottom: 1px solid #333;
}

div.ecb_top_honbun {
    width: 85%;
    text-align: justify;
    font-size: 1rem;
    margin-inline: auto;
    margin-top: 1rem;
    margin-bottom: 2rem;
    line-height: 1.8rem;
}

div.title_list {
    width: 90%;
    margin-inline: auto;
    display: flex;
    flex-wrap: wrap;
    flex-direction: row;
    justify-content: space-around;
}

div.each_title {
    width: 28%;
    max-width: 280px;
    min-height: 180px;
    margin: 1rem;
}

div.banner {
    height: 160px;
    overflow: hidden;
    position: relative;
    border: 1px solid #333;
}

.bt_01{
    background-color:#f7734b;
    color:#fff;
    width: 100%;
    padding: 0.3rem;
    border: solid 1px #e73068;
    border-radius: 4px; 
    text-align:center;
    margin-top:0.5rem;
    margin-bottom:0.5rem;
    font-weight:600;
}

.bt_01 a:link {
    color: #fff;
    text-decoration: none;
}

.bt_01 a:visited {
    color: #fff;
    text-decoration: none;
}

.bt_01:hover{
    opacity: 0.7;
}

.bt_02{
    background-color:#3ad7ea;
    color:#fff;
    width: 30%;
    padding: 0.3rem;
    border: solid 1px #006666;
    border-radius: 4px; 
    text-align:center;
    margin-top:1rem;
    margin-bottom:1rem;
    font-weight:600;
    margin-inline: auto;
}

.bt_02 a:link {
    color: #fff;
    text-decoration: none;
}

.bt_02 a:visited {
    color: #fff;
    text-decoration: none;
}

.bt_02:hover{
    opacity: 0.7;
}

.update{
    font-size:0.75rem;
    color:#545a60;
    text-align: right;}

ul.title_list_coming {
    width: 85%;
    list-style-type: none;
    padding: 0px;
    margin-inline: auto;
}

ul.title_list_coming li {
    border-bottom: 1px dotted #97a4a7;
    margin-top:0.5rem;
    margin-bottom:0.5rem;
}

ul.title_list_coming li p.coming_title {
    line-height: 1.5rem;
    list-style-type: none;
}

ul.title_list_coming li span.coming_title_data {
    font-size: 0.9rem;
    color: #999;
}

p.contents {
    font-weight: 700;
    color: #333;
    margin-bottom: 1.5rem;
    padding-left: 1rem;
}

ruby.ecb_ruby rt {
    font-family: "Times New Roman", "YuMincho", "Hiragino Mincho ProN", "Yu Mincho", "MS PMincho", serif;
    font-size: 0.6rem;
    color: #444;
}

div.author_info {
    width: 90%;
    max-width: 800px;
    padding: 1rem;
    margin-inline: auto;
    margin-bottom: 2rem;
    line-height: 1.8rem;
    background-color: #efefe7;
}

span.author_name {
    font-weight: 800;
}

div.author_info dd {
    font-size: 0.95rem;
    line-height: 160%;
}

div#footer {
    width: 100%;
    padding: 10px 0px 10px;
    background: #434e55;
    font-size: 0.7rem;
    color: #fff;
    text-align: center;
}

.page_navi {
    width: 100%;
    text-align: center;
    font-size: 1rem;
    background-color: #dde6e6;
    color: #999;
    padding: 0.5rem 0;
    margin: 0rem;
    font-family: "Lucida Grande", "Hiragino Kaku Gothic Pro", "ヒラギノ角ゴ Pro W3", "ＭＳ Ｐゴシック", Geneva, Arial, Verdana, sans-serif;
}

@media screen and (max-width: 480px) {
    div.items {
        flex-basis: 45%;
        text-align: center;
        margin: 0.5em;
    }
}