:root {
  color-scheme: dark;
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Kaku Gothic ProN", "Hiragino Sans", "Yu Gothic", Meiryo, sans-serif;
  font-synthesis: none;
  background: #111318;
  color: #e9eaed;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-padding-top: 2rem;
}

body {
  margin: 0;
  font-size: 16px;
  line-height: 1.9;
  -webkit-font-smoothing: antialiased;
}

::selection {
  background: #445675;
  color: #fff;
}

a {
  color: #b9cbf5;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
}

a:hover {
  color: #e0eaff;
}

a:focus-visible {
  outline: 2px solid #c8d8ff;
  outline-offset: 5px;
}

h1,
h2,
h3,
p {
  margin: 0;
}

p {
  text-wrap: pretty;
}

.wrap {
  width: min(860px, calc(100% - 48px));
  margin-inline: auto;
}

.skip-link {
  position: fixed;
  z-index: 1;
  top: 12px;
  left: 12px;
  padding: 8px 12px;
  background: #e9eaed;
  color: #111318;
  transform: translateY(-160%);
}

.skip-link:focus {
  transform: translateY(0);
}

.site-header {
  border-bottom: 1px solid #2a2e35;
}

.header-inner {
  display: flex;
  min-height: 80px;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  color: #e9eaed;
  font-size: 15px;
  font-weight: 650;
  text-decoration: none;
  white-space: nowrap;
}

.header-nav {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px 25px;
}

.header-nav a {
  color: #c3c6cc;
  font-size: 13px;
  text-decoration: none;
  white-space: nowrap;
}

.brand:hover,
.header-nav a:hover {
  color: #fff;
  text-decoration: underline;
  text-underline-offset: 0.25em;
}

.intro {
  padding-top: 72px;
}

.intro h1 {
  margin-bottom: 22px;
  font-size: 24px;
  line-height: 1.5;
  letter-spacing: -0.025em;
}

.intro p,
.section > p,
.services,
.publications p {
  color: #b9bdc6;
}

.intro p {
  max-width: 760px;
}

.intro p + p {
  margin-top: 16px;
}

.section {
  padding-top: 80px;
}

.section h2 {
  margin-bottom: 22px;
  font-size: 24px;
  line-height: 1.5;
  letter-spacing: -0.025em;
}

.section > p {
  max-width: 760px;
}

.section > p + p {
  margin-top: 16px;
}

.services {
  max-width: 760px;
  margin: 0;
  padding-left: 1.5em;
}

.services li + li {
  margin-top: 8px;
}

.publications {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 48px 28px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.publications h3 {
  font-size: 17px;
  line-height: 1.6;
}

.publications h3 a {
  font-weight: 600;
}

.thumbnail {
  position: relative;
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  margin-top: 14px;
  overflow: hidden;
  border-radius: 4px;
  background: #fff;
}

.thumbnail img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.thumbnail .community-logo {
  object-fit: contain;
}

.thumbnail:hover img {
  opacity: 0.85;
}

.play-icon {
  position: absolute;
  right: 14px;
  bottom: 14px;
  display: grid;
  width: 44px;
  height: 44px;
  place-items: center;
  padding-left: 2px;
  border-radius: 50%;
  background: rgb(0 0 0 / 75%);
  color: #fff;
  font-size: 16px;
  line-height: 1;
}

.publications p {
  margin-top: 12px;
  font-size: 15px;
}

.publications .image-credit {
  margin-top: 6px;
  font-size: 12px;
}

.site-footer {
  display: flex;
  gap: 8px;
  padding-block: 96px 42px;
}

.site-footer a {
  display: inline-flex;
  width: 44px;
  height: 44px;
  align-items: center;
  justify-content: center;
}

.site-footer a:hover {
  opacity: 0.75;
}

.site-footer img {
  display: block;
}

.not-found {
  display: flex;
  min-height: 100vh;
  flex-direction: column;
  padding-block: 24px 64px;
}

.not-found > div {
  margin-block: auto;
  padding-block: 80px;
}

.not-found h1 {
  font-size: clamp(28px, 4vw, 40px);
  line-height: 1.5;
}

.not-found p {
  margin-block: 20px;
  color: #b9bdc6;
}

@media (max-width: 640px) {
  body {
    font-size: 15px;
  }

  .wrap {
    width: calc(100% - 40px);
  }

  .header-inner {
    min-height: 0;
    align-items: flex-start;
    flex-direction: column;
    gap: 14px;
    padding-block: 20px;
  }

  .header-nav {
    gap: 8px 18px;
  }

  .header-nav a {
    font-size: 12px;
  }

  .intro {
    padding-top: 48px;
  }

  .intro h1 {
    font-size: 21px;
  }

  .section {
    padding-top: 72px;
  }

  .section h2 {
    font-size: 21px;
  }

  .publications {
    grid-template-columns: 1fr;
  }

  .site-footer {
    padding-block: 80px 36px;
  }
}