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

body {
  font-family: Helvetica, Arial, sans-serif;
  font-size: 16px;
  background: #0a0e1c;
  color: #000;
  margin: 0;
  padding: 48px 24px;
  display: flex;
  justify-content: center;
  min-height: 100vh;
}

#sky {
  position: fixed;
  inset: 0;
  z-index: -1;
}

.container {
  background: #fff;
  width: 100%;
  max-width: 820px;
  padding: 40px 48px 48px;
  align-self: flex-start;
}

header {
  display: flex;
  flex-direction: row-reverse;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 48px;
}

nav {
  display: flex;
  flex-direction: row;
  gap: 24px;
}

nav a {
  text-decoration: none;
  color: #000;
  font-size: 16px;
}

nav a:hover {
  text-decoration: underline;
}

nav a.active {
  text-decoration: underline;
}

.lang {
  position: fixed;
  top: 10px;
  right: 12px;
  z-index: 10;
  font-size: 15px;
  line-height: 1;
}

.lang a,
.lang .current {
  font-size: inherit;
}

.lang a {
  opacity: 0.55;
  text-decoration: none;
}

.lang a:hover {
  opacity: 1;
}

.site-name {
  font-weight: bold;
  font-size: 16px;
  text-decoration: none;
  color: #000;
}

main {
  max-width: 100%;
}

main p {
  line-height: 1.6;
  margin-bottom: 12px;
}

main h2 {
  font-size: 16px;
  font-weight: bold;
  border-bottom: 2px solid #000;
  padding-bottom: 6px;
  margin-bottom: 16px;
  margin-top: 36px;
}

main h2:first-child {
  margin-top: 0;
}

main ul {
  list-style: none;
  padding: 0;
}

main ul li {
  margin-bottom: 16px;
  line-height: 1.6;
}

main ul ul {
  margin-top: 2px;
  padding-left: 24px;
}

main ul ul li {
  margin-bottom: 2px;
  color: #555;
}

main ol {
  padding-left: 20px;
}

main ol li {
  margin-bottom: 12px;
  line-height: 1.6;
}

main ol a {
  text-decoration: none;
}

main ol a:hover {
  text-decoration: underline;
}

main a {
  color: #000;
}

main a:hover {
  text-decoration: none;
}

.about {
  display: flex;
  gap: 36px;
  align-items: flex-start;
}

.about-photo {
  flex: 0 0 180px;
}

.about-photo img {
  width: 100%;
  display: block;
}

.about-photo address {
  font-style: normal;
  font-size: 14px;
  line-height: 1.5;
  color: #555;
  margin-top: 12px;
}

.about-email {
  font-size: 14px;
  margin-top: 8px;
}

.about-links {
  font-size: 14px;
  margin-top: 4px;
}

.about-text {
  flex: 1;
}

.research-item {
  display: flex;
  gap: 36px;
  align-items: flex-start;
  margin-bottom: 48px;
}

.research-item img {
  flex: 0 0 180px;
  width: 180px;
  height: 180px;
  object-fit: cover;
}

.research-item > div {
  flex: 1;
}

@media (max-width: 640px) {
  body {
    padding: 16px 10px;
  }

  .container {
    padding: 28px 24px;
  }

  header {
    flex-direction: column-reverse;
    gap: 16px;
    margin-bottom: 36px;
  }

  nav {
    flex-wrap: wrap;
    gap: 8px 16px;
  }
}

@media (max-width: 480px) {
  .about,
  .research-item {
    flex-direction: column;
  }

  .about-photo {
    flex: none;
    width: 180px;
  }

  .research-item img {
    flex: none;
  }
}