@media screen {
  :root {
    --button-inline-size: max(52px, 1.5rem + 12px * 2);
    --button-padding: 12px;
    --container-padding-block: 64px;
    --container-padding-inline: 32px;
    --heading-font-size: 1rem;
    --stack-grid-template-columns: 1fr;
  }
}
@media screen and (min-width: 744px) {
  :root {
    --container-padding-block: 128px;
    --container-padding-inline: calc((100% - (744px - 64px * 2)) / 2);
    --heading-font-size: 1.5rem;
    --stack-grid-template-columns: repeat(2, 1fr);
  }
}

html {
  color: #262626;
  font-family: "Roboto", "Helvetica Neue", "Arial", "Segoe UI", "Noto Sans JP",
    "Hiragino Kaku Gothic ProN", "Hiragino Sans", "Meiryo", sans-serif;
  font-size: 100%;
  font-weight: 700;
  line-height: 1.25;
  scroll-behavior: smooth;
}

a:where(:any-link) {
  color: #005aff;
  text-decoration: underline;
}
a:where(:any-link:focus) {
  outline: solid 4px #595959;
  border-radius: 4px;
}

.heading {
  align-items: center;
  display: flex;
  flex-direction: column;
  font-size: var(--heading-font-size);
  row-gap: 16px;
  text-align: center;
}
.heading > svg {
  aspect-ratio: 1/1;
  block-size: auto;
  inline-size: 2em;
}

.body {
  display: grid;
  grid-template-rows: auto 1fr auto;
  min-block-size: 100dvh;
}

.header {
  background-color: #fff;
  padding: 16px;
}
.title {
  font-size: 1.5rem;
  text-align: center;
}

.app {
  background-color: #f2f2f2;
  display: flex;
  flex-direction: column;
  padding-block: var(--container-padding-block);
  padding-inline: var(--container-padding-inline);
  row-gap: calc(var(--container-padding-block) / 2);
}
.app__image {
  aspect-ratio: 1200/630;
  background-color: #fff;
  block-size: auto;
  border-radius: 8px;
  border: solid 1px #d8d8d8;
  inline-size: 100%;
}
.app__nav {
  display: flex;
  flex-direction: column;
  row-gap: 16px;
}
.app__list {
  gap: 16px;
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
}
.app__button {
  align-items: center;
  aspect-ratio: 1/1;
  background-color: #fff;
  block-size: auto;
  border-radius: 50%;
  border: solid 1px #d8d8d8;
  cursor: pointer;
  display: flex;
  inline-size: var(--button-inline-size);
  justify-content: center;
  padding: var(--button-padding);
}
.app__button:focus {
  outline: solid #595959 4px;
}
.app__button--x {
  background-color: #000;
  color: #fff;
}
.app__button--bluesky {
  background-color: #0a7aff;
  color: #fff;
}
.app__button--threads {
  background-color: #000;
  color: #fff;
}
.app__button--misskey {
  color: #8ab942;
}
.app__button--mastodon {
  background-color: #17063b;
}
.app__button--line {
  background-color: #06c755;
  color: #fff;
}
.app__button--copy {
  aspect-ratio: auto;
  border-radius: 9999px;
  column-gap: 16px;
  inline-size: 100%;
}
.app__button > svg {
  aspect-ratio: 1/1;
  block-size: auto;
  inline-size: 1.5rem;
}
.app__notice {
  align-self: center;
  line-height: 1.5;
}

.how-to-use {
  background-color: #fff;
  display: grid;
  gap: calc(var(--container-padding-block) / 2);
  grid-template-columns: var(--stack-grid-template-columns);
  padding-block: var(--container-padding-block);
  padding-inline: var(--container-padding-inline);
}
.how-to-use ol {
  counter-reset: item;
  display: flex;
  flex-direction: column;
  line-height: 1.5;
  row-gap: 32px;
}
.how-to-use ol > li {
  display: grid;
  grid-template-columns: auto 1fr;
  column-gap: 16px;
}
.how-to-use ol > li::before {
  align-items: center;
  aspect-ratio: 1/1;
  background-color: #f2f2f2;
  block-size: auto;
  border-radius: 50%;
  border: solid 1px #d8d8d8;
  content: counter(item);
  counter-increment: item;
  display: flex;
  font-size: 1.5rem;
  inline-size: var(--button-inline-size);
  justify-content: center;
  line-height: 1;
  padding: var(--button-padding);
}

.disclaimers {
  background-color: #fff2cc;
  display: grid;
  gap: calc(var(--container-padding-block) / 2);
  grid-template-columns: var(--stack-grid-template-columns);
  padding-block: var(--container-padding-block);
  padding-inline: var(--container-padding-inline);
}
.disclaimers ul {
  display: flex;
  flex-direction: column;
  line-height: 1.5;
  list-style-type: disc;
  padding-inline-start: 1rem;
  row-gap: 16px;
}

.footer {
  background-color: #fff;
  padding: 32px;
}
.copyright {
  text-align: center;
}