:root {
  --bg: #f7f7f7;
  --surface: #ffffff;
  --text: #3f4348;
  --border: #e7e7e7;
  --link: #4fa7c8;
  --heading: #444b52;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.03);
}

* {
  box-sizing: border-box;
}

  .page {
      display: flex;
      gap: 60px;
      align-items: flex-start;
      max-width: 1400px;
      margin: 40px auto;
      padding: 0 40px;
    }

    .topbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: white;
}

    .sidebar {
      width: 320px;
      position: sticky;
      top: 100px;
      align-self: flex-start;
      flex-shrink: 0;
    }

    .content {
      flex: 1;
      min-width: 0;
    }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.55;
  font-size: 16px;
}

a {
  color: var(--link);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.topbar {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}

.topbar-inner {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 34px;
  height: 86px;
  display: flex;
  align-items: center;
  gap: 36px;
}

.brand {
  font-size: 28px;
  font-weight: 700;
  color: #5a6168;
  white-space: nowrap;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 34px;
  margin-left: 40px;
}

.nav a {
  color: #7d848c;
  font-size: 16px;
  font-weight: 500;
}

.page {
  max-width: 1400px;
  margin: 0 auto;
  padding: 48px 34px 72px;
  display: grid;
  grid-template-columns: 290px minmax(0, 1fr);
  gap: 64px;
}

.sidebar {
  align-self: start;
}

.profile-photo {
  width: 220px;
  aspect-ratio: 1 / 1;
  border-radius: 50%;
  overflow: hidden;
  background: #ececec;
  border: 4px solid #f1f1f1;
  box-shadow: var(--shadow);
  margin-bottom: 18px;
}

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

.sidebar h1 {
  margin: 0 0 10px;
  font-size: 28px;
  line-height: 1.2;
  color: var(--heading);
}

.role,
.affiliation {
  font-size: 18px;
  color: var(--text);
  margin: 0;
}

.affiliation {
  margin-bottom: 26px;
}

.meta {
  display: grid;
  gap: 14px;
  font-size: 18px;
  color: var(--text);
}

.meta-item {
  display: flex;
  align-items: center;
  gap: 10px;
}

.icon {
  width: 16px;
  text-align: center;
  color: #222;
  flex: 0 0 16px;
}

.content section + section {
  margin-top: 34px;
}

.content h2 {
  margin: 6px 0 18px;
  font-size: 20px;
  color: var(--heading);
  line-height: 1.25;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border);
}

.content p {
  font-size: 17px;
  margin: 0 0 24px;
  color: var(--text);
  max-width: 950px;
}

.news-list {
  margin: 6px 0 0;
  padding-left: 26px;
  max-width: 980px;
}

.news-list li {
  font-size: 17px;
  margin-bottom: 14px;
}

.quick-links {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 10px;
}

.quick-links a {
  display: inline-block;
  padding: 8px 14px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface);
  color: var(--text);
  font-size: 16px;
}

.pub-list {
  display: grid;
  gap: 28px;
}

.pub-item {
  font-size: 17px;
  max-width: 980px;
}

.pub-item strong {
  color: var(--heading);
}

.pub-links {
  margin-top: 6px;
  font-size: 16px;
}

.pub-links a {
  margin-right: 14px;
}

@media (max-width: 1024px) {
  .topbar-inner {
    height: auto;
    padding-top: 18px;
    padding-bottom: 18px;
    align-items: flex-start;
    flex-direction: column;
    gap: 14px;
  }

  .nav {
    margin-left: 0;
    gap: 20px;
  }

  .nav a {
    font-size: 15px;
  }

  .page {
    grid-template-columns: 1fr;
    gap: 30px;
  }

  .sidebar {
    max-width: 380px;
  }

  .content p,
  .news-list li,
  .pub-item {
    font-size: 16px;
  }
}

@media (max-width: 640px) {
  .topbar-inner,
  .page {
    padding-left: 18px;
    padding-right: 18px;
  }

  .brand {
    font-size: 24px;
  }

  .profile-photo {
    width: 180px;
  }

  .content p,
  .news-list li,
  .pub-item {
    font-size: 15px;
  }
}