* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

ol, ul {
    padding-left: 2em;
}

p {
    margin: 1em 0;
    line-height: 1.5;
}

html, body {
    min-height: 100%;
}

html {
    scroll-behavior: smooth;
}

html {
    background-color: white;
}

body {
    max-width: 1024px;
    margin: 0 auto;
    color: #303030;
    font-family: "Noto Sans JP";
}

main {
    width: 100%;
    padding: 0 1em;
}

.image-list {
    margin: 1em 0;
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
    justify-content: space-around;
    align-items: flex-start;
}
.image-list img {
    width: 160px;
    border-radius: 50%;
}

.graph-list {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-around;
}
.graph-list figure {
    min-width: 100px;
    max-width: 400px;
    margin: 1em;
    box-shadow: 0 0 4px black;
    border-radius: 4px;
}
.graph-list figure img {
    width: 100%;
    object-fit: contain;
}

figure {
    text-align: center;
}

.silica {
    position: relative;
    max-width: 600px;
    margin: 0 auto;
    line-height: 2;
    text-shadow: 0 0 5px black;
    letter-spacing: 0.25em;
}

.silica img {
    width: 100%;
    border-radius: 16px;
}

.silica span {
    display: block;
    color: white;
    text-align: center;
}

h2 {
    margin: 1em 0;
    font-size: 2rem;
    text-align: center;
}

.overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

figure img {
    border:  4px solid white;
    width: 90%;
    object-fit: contain;
}

figcaption {
    padding: 0.5em 0;
    text-align: center;
    font-weight: bold;
}

header {
}


.abst {
    padding: 1em;
    text-align: center;
    line-height: 2;
    font-weight: bold;
}

.hbox {
    display: flex;
    flex-direction: row;
    flex-wrap: wrap;
}

.blank {
    flex-grow: 1;
}

ul.global-nav {
    font-size: smaller;
    display: flex;
    flex-wrap: wrap;
    flex-direction: row;
    justify-content: flex-start;
    align-items: center;
    margin: 0;
    padding: 0;
    list-style-type: none;
    height: 100%;
}

ul.global-nav li {
    padding: 0.5em 1em;
}

header h1 {
    margin-top: 1rem;
    text-align: center;
}

h2 {
    font-family: 'M PLUS 1p';
    font-size: 1.5rem;
    letter-spacing: 0.25em;
    background-color: #729fcf;
    color: white;
    font-weight: normal;
    border-radius: 8px;
}

h3 {
    border-bottom: 1px solid #729fcf;
}

.small {
    font-size: 40%;
}

#page_top {
    box-sizing: content-box;
    width: 50px;
    height: 50px;
    position: fixed;
    right: 8px;
    bottom: 8px;
    border: 4px solid black;
    border-radius: 50%;
    opacity: 0.6;
}

#page_top a {
    position: relative;
    display: block;
    width: 50px;
    height: 50px;
    text-decoration: none;
}

#page_top a::before {
    font-family: 'Font Awesome 5 Free';
    font-weight: 900;
    content: '\f0d8';
    font-size: 25px;
    color: black;
    position: absolute;
    width: 25px;
    height: 25px;
    top: -15px;
    bottom: 0;
    right: 0;
    left: 0;
    margin: auto;
    text-align: center;
}

#page_top a::after {
    content: 'TOP';
    font-size: 13px;
    color: black;
    position: absolute;
    top: 25px;
    bottom: 0;
    right: 0;
    left: 0;
    margin: auto;
    text-align: center;
}

footer {
    margin-top: 2em;
    font-size: small;
    text-align: center;
    padding: 2em 1em;
    border-top: 1px solid black;
}
.link-button {
    cursor: pointer;
    display: block;
    margin: 0 auto;
    width: 80%;
    text-align: center;
    color: #131;
    font-weight: bold;
    border: 2px solid #363;
    border-radius: 0.5em;
    padding: 0.5em 1em;
    text-decoration: none;
    background-color: transparent;
    transition: background-color 0.5s;
}
.link-button:hover {
    color: white;
    background-color: #363;
}
.logo {
    display: block;
    text-align: center;
    padding: 4px;
    margin: 0 auto;
}