:root, ::backdrop {
  --sans-font: -apple-system, BlinkMacSystemFont, "Avenir Next", Avenir, "Nimbus Sans L", Roboto, "Noto Sans", "Segoe UI", Arial, Helvetica, "Helvetica Neue", sans-serif;
  --mono-font: Consolas, Menlo, Monaco, "Andale Mono", "Ubuntu Mono", monospace;
  --standard-border-radius: 5px;
  --bg: #fff;
  --accent-bg: #f5f7ff;
  --text: #212121;
  --text-light: #585858;
  --border: #898ea4;
  --accent: #0d47a1;
  --accent-hover: #1266e2;
  --accent-text: var(--bg);
  --code: #d81b60;
  --preformatted: #444;
  --marked: #fd3;
  --disabled: #efefef
}
@media (prefers-color-scheme:dark) {
  :root, ::backdrop {
    color-scheme: dark;
    --bg: #212121;
    --accent-bg: #2b2b2b;
    --text: #dcdcdc;
    --text-light: #ababab;
    --accent: #ffb300;
    --accent-hover: #ffe099;
    --accent-text: var(--bg);
    --code: #f06292;
    --preformatted: #ccc;
    --disabled: #111
  }
  img, video {
    opacity: .8
  }
}
*, :before, :after {
  box-sizing: border-box
}
textarea, select, input, progress {
  -webkit-appearance: none;
  -moz-appearance: none;
  appearance: none
}
html {
  font-family: var(--sans-font);
  scroll-behavior: smooth
}
body {
  color: var(--text);
  background-color: var(--bg);
  grid-template-columns: 1fr min(45rem, 90%) 1fr;
  margin: 0;
  font-size: 1.15rem;
  line-height: 1.5;
  display: grid
}
body > * {
  grid-column: 2
}
body > header {
  background-color: var(--accent-bg);
  border-bottom: 1px solid var(--border);
  text-align: center;
  grid-column: 1/-1;
  padding: 0 .5rem 2rem
}
body > header > :only-child {
  margin-block-start: 2rem
}
body > header h1 {
  max-width: 1200px;
  margin: 1rem auto
}
body > header p {
  max-width: 40rem;
  margin: 1rem auto
}
main {
  padding-top: 1.5rem
}
body > footer {
  color: var(--text-light);
  text-align: center;
  border-top: 1px solid var(--border);
  margin-top: 4rem;
  padding: 2rem 1rem 1.5rem;
  font-size: .9rem
}
h1 {
  font-size: 3rem
}
h2 {
  margin-top: 3rem;
  font-size: 2.6rem
}
h3 {
  border: 2px solid; /* 枠線を設定 */
  padding: 10px; /* 枠線と文字の間に余白 */
  display: inline-block; /* 他の要素と同じ行に配置可能にする */
  margin-top: 3rem;
  font-size: 2rem
}
h4 {
  font-size: 1.44rem
}
h5 {
  font-size: 1.15rem
}
h6 {
  font-size: .96rem
}
p {
  margin: 1.5rem 0
}
p, h1, h2, h3, h4, h5, h6 {
  overflow-wrap: break-word
}
h1, h2, h3 {
  line-height: 1.1
}
@media only screen and (width<=720px) {
  h1 {
    font-size: 2.5rem
  }
  h2 {
    font-size: 2.1rem
  }
  h3 {
    font-size: 1.75rem
  }
  h4 {
    font-size: 1.25rem
  }
}
a, a:visited {
  color: var(--accent)
}
a:hover {
  text-decoration: none
}
button, .button, a.button, input[type=submit], input[type=reset], input[type=button], label[type=button] {
  border: 1px solid var(--accent);
  background-color: var(--accent);
  color: var(--accent-text);
  padding: .5rem .9rem;
  line-height: normal;
  text-decoration: none
}
.button[aria-disabled=true], input:disabled, textarea:disabled, select:disabled, button[disabled] {
  cursor: not-allowed;
  background-color: var(--disabled);
  border-color: var(--disabled);
  color: var(--text-light)
}
input[type=range] {
  padding: 0
}
abbr[title] {
  cursor: help;
  text-decoration-line: underline;
  text-decoration-style: dotted
}
button:enabled:hover, .button:not([aria-disabled=true]):hover, input[type=submit]:enabled:hover, input[type=reset]:enabled:hover, input[type=button]:enabled:hover, label[type=button]:hover {
  background-color: var(--accent-hover);
  border-color: var(--accent-hover);
  cursor: pointer
}
.button:focus-visible, button:focus-visible:where(:enabled), input:enabled:focus-visible:where([type=submit], [type=reset], [type=button]) {
  outline: 2px solid var(--accent);
  outline-offset: 1px
}
header > nav {
  padding: 1rem 0 0;
  font-size: 1rem;
  line-height: 2
}
header > nav ul, header > nav ol {
  flex-flow: wrap;
  place-content: space-around center;
  align-items: center;
  margin: 0;
  padding: 0;
  list-style-type: none;
  display: flex
}
header > nav ul li, header > nav ol li {
  display: inline-block
}
header > nav a, header > nav a:visited {
  border: 1px solid var(--border);
  border-radius: var(--standard-border-radius);
  color: var(--text);
  margin: 0 .5rem 1rem;
  padding: .1rem 1rem;
  text-decoration: none;
  display: inline-block
}
header > nav a:hover, header > nav a.current, header > nav a[aria-current=page], header > nav a[aria-current=true] {
  border-color: var(--accent);
  color: var(--accent);
  cursor: pointer
}
@media only screen and (width<=720px) {
  header > nav a {
    border: none;
    padding: 0;
    line-height: 1;
    text-decoration: underline
  }
}
aside, details, pre, progress {
  background-color: var(--accent-bg);
  border: 1px solid var(--border);
  border-radius: var(--standard-border-radius);
  margin-bottom: 1rem
}
aside {
  float: right;
  width: 30%;
  margin-inline-start: 15px;
  padding: 0 15px;
  font-size: 1rem
}
[dir=rtl] aside {
  float: left
}
@media only screen and (width<=720px) {
  aside {
    float: none;
    width: 100%;
    margin-inline-start: 0
  }
}
article, fieldset, dialog {
  border: 1px solid var(--border);
  border-radius: var(--standard-border-radius);
  margin-bottom: 1rem;
  padding: 1rem
}
article h2:first-child, section h2:first-child, article h3:first-child, section h3:first-child {
  margin-top: 1rem
}
section {
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  margin: 3rem 0;
  padding: 2rem 1rem
}
section + section, section:first-child {
  border-top: 0;
  padding-top: 0
}
section + section {
  margin-top: 0
}
section:last-child {
  border-bottom: 0;
  padding-bottom: 0
}
details {
  padding: .7rem 1rem
}
summary {
  cursor: pointer;
  word-break: break-all;
  margin: -.7rem -1rem;
  padding: .7rem 1rem;
  font-weight: 700
}
details[open] > summary + * {
  margin-top: 0
}
details[open] > summary {
  margin-bottom: .5rem
}
details[open] > :last-child {
  margin-bottom: 0
}
table {
  border-collapse: collapse;
  margin: 1.5rem 0
}
figure > table {
  width: max-content;
  margin: 0
}
td, th {
  border: 1px solid var(--border);
  text-align: start;
  padding: .5rem
}
th {
  background-color: var(--accent-bg);
  font-weight: 700
}
table caption {
  margin-bottom: .5rem;
  font-weight: 700
}
textarea, select, input, button, .button {
  font-size: inherit;
  border-radius: var(--standard-border-radius);
  box-shadow: none;
  max-width: 100%;
  margin-bottom: .5rem;
  padding: .5rem;
  font-family: inherit;
  display: inline-block
}
textarea, select, input {
  color: var(--text);
  background-color: var(--bg);
  border: 1px solid var(--border)
}
label {
  display: block
}
textarea:not([cols]) {
  width: 100%
}
select:not([multiple]) {
  background-image: linear-gradient(45deg, transparent 49%, var(--text)51%), linear-gradient(135deg, var(--text)51%, transparent 49%);
  background-position: calc(100% - 15px), calc(100% - 10px);
  background-repeat: no-repeat;
  background-size: 5px 5px, 5px 5px;
  padding-inline-end: 25px
}
[dir=rtl] select:not([multiple]) {
  background-position: 10px, 15px
}
input[type=checkbox], input[type=radio] {
  vertical-align: middle;
  width: min-content;
  position: relative
}
input[type=checkbox] + label, input[type=radio] + label {
  display: inline-block
}
input[type=radio] {
  border-radius: 100%
}
input[type=checkbox]:checked, input[type=radio]:checked {
  background-color: var(--accent)
}
input[type=checkbox]:checked:after {
  content: " ";
  border-right: solid var(--bg).08em;
  border-bottom: solid var(--bg).08em;
  background-color: #0000;
  border-radius: 0;
  width: .18em;
  height: .32em;
  font-size: 1.8em;
  position: absolute;
  top: .05em;
  left: .17em;
  transform: rotate(45deg)
}
input[type=radio]:checked:after {
  content: " ";
  background-color: var(--bg);
  border-radius: 100%;
  width: .25em;
  height: .25em;
  font-size: 32px;
  position: absolute;
  top: .125em;
  left: .125em
}
@media only screen and (width<=720px) {
  textarea, select, input {
    width: 100%
  }
}
input[type=color] {
  height: 2.5rem;
  padding: .2rem
}
input[type=file] {
  border: 0
}
hr {
  background: var(--border);
  border: none;
  height: 1px;
  margin: 1rem auto
}
mark {
  border-radius: var(--standard-border-radius);
  background-color: var(--marked);
  color: #000;
  padding: 2px 5px
}
mark a {
  color: #0d47a1
}
img, video {
  border-radius: var(--standard-border-radius);
  max-width: 100%;
  height: auto
}
figure {
  margin: 0;
  display: block;
  overflow-x: auto
}
figure > img, figure > picture > img {
  margin-inline: auto;
  display: block
}
figcaption {
  text-align: center;
  color: var(--text-light);
  margin-block: 1rem;
  font-size: .9rem
}
blockquote {
  border-inline-start: .35rem solid var(--accent);
  color: var(--text-light);
  margin-block: 2rem;
  margin-inline: 2rem 0;
  padding: .4rem .8rem;
  font-style: italic
}
cite {
  color: var(--text-light);
  font-size: .9rem;
  font-style: normal
}
dt {
  color: var(--text-light)
}
code, pre, pre span, kbd, samp {
  font-family: var(--mono-font);
  color: var(--code)
}
kbd {
  color: var(--preformatted);
  border: 1px solid var(--preformatted);
  border-bottom: 3px solid var(--preformatted);
  border-radius: var(--standard-border-radius);
  padding: .1rem .4rem
}
pre {
  color: var(--preformatted);
  max-width: 100%;
  padding: 1rem 1.4rem;
  overflow: auto
}
pre code {
  color: var(--preformatted);
  background: 0 0;
  margin: 0;
  padding: 0
}
progress {
  width: 100%
}
progress:indeterminate {
  background-color: var(--accent-bg)
}
progress::-webkit-progress-bar {
  border-radius: var(--standard-border-radius);
  background-color: var(--accent-bg)
}
progress::-webkit-progress-value {
  border-radius: var(--standard-border-radius);
  background-color: var(--accent)
}
progress::-moz-progress-bar {
  border-radius: var(--standard-border-radius);
  background-color: var(--accent);
  transition-property: width;
  transition-duration: .3s
}
progress:indeterminate::-moz-progress-bar {
  background-color: var(--accent-bg)
}
dialog {
  max-width: 40rem;
  margin: auto
}
dialog::backdrop {
  background-color: var(--bg);
  opacity: .8
}
@media only screen and (width<=720px) {
  dialog {
    max-width: 100%;
    margin: auto 1em
  }
}
sup, sub {
  vertical-align: baseline;
  position: relative
}
sup {
  top: -.4em
}
sub {
  top: .3em
}
.notice {
  background: var(--accent-bg);
  border: 2px solid var(--border);
  border-radius: var(--standard-border-radius);
  margin: 2rem 0;
  padding: 1.5rem
}