* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Helvetica Neue", Arial, Helvetica, sans-serif;
  color: #222;
  background: #fff;
  line-height: 1.65;
  font-size: 17px;
}

a {
  color: #315c8a;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}


/* Header */

.site-header {
  border-bottom: 1px solid #ececec;
  background: #fff;
}

.header-inner {
  max-width: 1180px;
  margin: 0 auto;
  padding: 27px 32px 23px;
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 30px;
}

.site-name {
  color: #222;
  font-size: 20px;
  font-weight: 600;
  letter-spacing: 0.1px;
  font-family: "Helvetica Neue", Arial, Helvetica, sans-serif;
}

.site-name:hover {
  text-decoration: none;
}


/* Navigation */

.nav {
  display: flex;
  gap: 28px;
  flex-wrap: wrap;
}

.nav a {
  color: #555;
  font-family: "Helvetica Neue", Arial, Helvetica, sans-serif;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.2px;
}

.nav a.active {
  color: #0B4DA2;
  font-weight: 700;
}

.nav a:hover {
  color: #0B4DA2;
  text-decoration: none;
}


/* Main page */

.page {
  max-width: 1180px;
  margin: 0 auto;
  padding: 70px 32px 45px;
}


/* Home page */

.profile-layout {
  display: grid;
  grid-template-columns: 320px minmax(0, 1fr);
  gap: 70px;
  align-items: start;
}

.photo-frame {
  width: 100%;
  max-width: 320px;
  aspect-ratio: 4 / 5;
  background: #f1f1f1;
  overflow: hidden;
}

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

.bio-column {
  width: 100%;
  max-width: 760px;
  font-family: "Helvetica Neue", Arial, Helvetica, sans-serif;
}

.bio-column h1 {
  font-family: "Helvetica Neue", Arial, Helvetica, sans-serif;
  font-size: 34px;
  font-weight: 500;
  line-height: 1.2;
  margin: -8px 0 22px;
  width: 100%;
  text-align: center;
}

.bio-column p {
  font-family: "Helvetica Neue", Arial, Helvetica, sans-serif;
  margin: 0 0 18px;
}

.welcome {
  font-size: 19px;
  margin-bottom: 17px;
}

.links {
  margin-top: 28px !important;
}

.links span {
  margin: 0 7px;
  color: #999;
}

.email {
  margin-top: 24px !important;
}

.email a {
  font-weight: 400;
}

/* Research page */

.content-page {
  max-width: 900px;
  font-family: "Helvetica Neue", Arial, Helvetica, sans-serif;
}

.content-page h1 {
  font-family: "Helvetica Neue", Arial, Helvetica, sans-serif;
  font-size: 34px;
  font-weight: 500;
  line-height: 1.2;
  margin: -8px 0 50px;
}

.research-item {
  margin: 0 0 65px;
  font-family: "Helvetica Neue", Arial, Helvetica, sans-serif;
}

.research-item h2 {
  font-family: "Helvetica Neue", Arial, Helvetica, sans-serif;
  font-size: 16px;
  font-weight: 600;
  line-height: 1.5;
  margin: 0 0 18px;
}

.research-item .paper-note {
  font-family: "Helvetica Neue", Arial, Helvetica, sans-serif;
  font-style: italic;
  color: #555;
  margin-top: -8px;
  margin-bottom: 22px;
}

.research-item .abstract-label {
  font-family: "Helvetica Neue", Arial, Helvetica, sans-serif;
  margin-top: 22px;
  margin-bottom: 12px;
  font-weight: 600;
}

.research-item p {
  font-family: "Helvetica Neue", Arial, Helvetica, sans-serif;
  line-height: 1.7;
  margin-top: 0;
  margin-bottom: 16px;
}

.paper-links {
  margin-top: 8px;
}

.coauthor-note {
  font-style: italic;
  font-weight: 400;
}


/* Teaching page */

.teaching-item {
  margin: 0 0 46px;
  font-family: "Helvetica Neue", Arial, Helvetica, sans-serif;
}

.teaching-item h2 {
  font-family: "Helvetica Neue", Arial, Helvetica, sans-serif;
  font-size: 21px;
  font-weight: 600;
  line-height: 1.4;
  margin: 0 0 8px;
}


/* Footer */

footer {
  max-width: 1180px;
  margin: 0 auto;
  padding: 10px 32px 35px;
  color: #999;
  font-family: "Helvetica Neue", Arial, Helvetica, sans-serif;
  font-size: 12px;
}


/* Mobile */

@media (max-width: 760px) {

  .header-inner {
    align-items: flex-start;
    flex-direction: column;
    gap: 12px;
    padding: 22px 22px 18px;
  }

  .nav {
    gap: 20px;
  }

  .page {
    padding: 45px 22px 30px;
  }

  .profile-layout {
    grid-template-columns: 1fr;
    gap: 35px;
  }

  .photo-frame {
    max-width: 240px;
  }

  .bio-column h1,
  .content-page h1 {
    font-size: 30px;
  }

  .bio-column h1 {
    text-align: center;
  }

  footer {
    padding-left: 22px;
    padding-right: 22px;
  }
}