body{
    font:100%/140% sans-serif;
    margin:0;
    padding:0;
}
header{
    max-width: 97em;
    padding:0 5%;
    margin: 0 auto;
    text-align: center;
}
h1{
    font-size:200%;
    line-height:140%;
    margin: 0 auto;
    padding:0.25em 0 0 0;
}
h1 img {
    max-width: 100%;
}
h1 img.logo {
    width: 1.6em;
    height: 1.6em;
    vertical-align: middle;
}
h1 a:link,h1 a:visited
{
    color:black;
}
a{
    text-decoration:none;
}
a:hover{
    text-decoration:underline;
}
input{
    max-width:98%;
}
header nav{
	margin:0.5em;
	width:100%;
	overflow:auto;
	white-space:nowrap;
}
header nav ul{
    list-style-type:none;
    padding:0;
	margin:0;
}
header nav li{
    display:inline-block;
    background-color:#f9f9f9;
    border:solid 1px #ccc;
    border-radius: 1em;
    padding:0.25em 0.7em;
    margin:0.25em;
}
header nav li a:link{
    color:black;
}
header nav li a:visited{
    color:black;
}
main{
    margin:0 auto;
    border-top:solid 1px #ccc;
    background-color:#f9f9f9;
}
main:after{
    display:block;
    clear:left;
    content:'--';
    visibility: hidden;
}
main > *
{
    width:95%;
    max-width: 97em;
    margin: 1em auto;
}
main h2 {
    max-width: 64em
}
footer {
    text-align: right;
}
footer nav li {
    display: inline-block;
    margin: 0.25em 0.5em;
    cursor: pointer;
}
table {
    margin-top: 0.5em;
    margin-bottom: 0.5em;
}
#scroll-top {
    position: fixed;
    width: 32pt;
    height: 32pt;
    right: 0.3em;
    bottom: 0.3em;
    font-size: 26pt;
    line-height: 32pt;
    padding-bottom: 4pt;
    z-index: 10;
    margin: 0;
    text-align: center;
    border-radius: 50%;
    background: white;
    border: solid 1px silver;
    color: gray;
    vertical-align: middle;
    opacity: 0.8;
    cursor: pointer;
}
@media screen and (max-width:45em){
    header{
        padding:0;
        overflow:hidden;
    }
    h1 {
        font-size: 150%;
        line-height: 140%;
    }
    h2 {
        font-size: 120%;
        line-height: 140%;
    }
}

iframe{
    max-width:90%;
}

textarea{
    max-width:90%;
}

.help {
    cursor: pointer;
}

.modal {
    display: none;
    justify-content: center; /* 水平方向中央 */
    align-items: center;     /* 垂直方向中央 */
    height: 100vh;           /* ビューポートの高さに合わせる */
    background-color: rgba(0, 0, 0, 0.5);
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
}

.modal > section {
    position: relative;
    width: 90%;
    max-height: 90%;
    padding: 0.5em;
    max-width: 97em;
    background-color: white;
}

.modal section section{
    overflow: auto;
    max-height: 90vh;
}

.modal .close {
    color: gray;
    position : absolute;
    top: 0.25em;
    right: 0.25em;
    font-size: 150%;
    margin: 0;
    padding: 3pt;
    cursor: pointer;
    background: white;
    border-radius: 2pt;
    border: solid 1px gray;
}

.note {
    border: solid 1px gray;
    width: 95%;
    margin: 0 auto;
    padding: 0.5em;
    display: none;
    border-radius: 0.5em;
}

.pointer {
    cursor: pointer;
}