:root {
  --bu-red: #cc0000;
  --bu-black: #2d2926;
  --bu-green: #154734;
  --ink: #151d19;
  --muted: #56645f;
  --quiet: #8c9993;
  --line: #d5dfd8;
  --paper: #fbfcfb;
  --ground: #f5f7f4;
  --accent: var(--bu-red);
  --font: Georgia;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--ground);
  color: var(--ink);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.55;
}

a {
  color: inherit;
  text-decoration-color: #aab7b0;
  text-decoration-thickness: 1px;
  text-underline-offset: 4px;
}

a:hover,
a:focus-visible {
  color: var(--accent);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  min-height: 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
  padding: 16px max(48px, calc((100vw - 1052px) / 2));
  background: var(--bu-green);
  color: #f6f9f6;
  box-shadow: 0 1px 0 rgba(21, 29, 25, 0.12);
}

.institution,
.nav {
  font-size: 13px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.institution {
  display: flex;
  align-items: center;
  gap: 20px;
  text-decoration: none;
}

.bu-logo {
  display: block;
  width: 178px;
  height: auto;
  border: 1px solid rgba(255, 255, 255, 0.35);
}

.department-name {
  color: #f6f9f6;
  white-space: nowrap;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 22px;
}

.nav a {
  color: #f6f9f6;
  text-decoration: none;
}

.nav a:hover,
.nav a:focus-visible {
  color: #ffd9d9;
}

.page-shell {
  width: min(1052px, calc(100% - 48px));
  margin: 44px auto 72px;
  display: grid;
  grid-template-columns: 232px minmax(0, 1fr);
  gap: clamp(36px, 5.6vw, 56px);
  align-items: start;
}

.profile {
  position: sticky;
  top: 156.9px;
  align-self: start;
  color: var(--muted);
  font-size: 14px;
}

.portrait {
  display: block;
  width: 100%;
  aspect-ratio: 4 / 5;
  object-fit: cover;
  border: 1px solid var(--line);
  background: #e7eee9;
}

.profile h1 {
  margin: 18px 0 6px;
  color: var(--ink);
  font-size: 29px;
  line-height: 1.12;
}

.role {
  margin: 0 0 26px;
}

.profile-block {
  margin-top: 0;
}

.profile h2,
.content h2 {
  margin: 0 0 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--bu-green);
  color: var(--bu-green);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

address {
  display: grid;
  gap: 4px;
  font-style: normal;
}

address a[href^="mailto:"] {
  color: var(--bu-red);
  text-decoration-color: var(--bu-red);
}

.content {
  min-width: 0;
}

.intro-section {
  max-width: 760px;
  margin-bottom: 46px;
}

.intro-section p {
  margin: 0 0 18px;
  font-size: 18px;
  line-height: 1.55;
}

.intro-section p:last-child {
  margin-bottom: 0;
}

.market-note strong {
  color: var(--ink);
}

.market-note a {
  color: var(--bu-red);
  text-decoration-color: var(--bu-red);
}

.section-block {
  margin-top: 38px;
}

#research,
#teaching,
#contact {
  scroll-margin-top: 136px;
}

.paper {
  padding: 20px 0 22px;
  border-bottom: 1px solid var(--line);
}

.paper h3 {
  margin: 0 0 8px;
  color: #0f1714;
  font-size: 20px;
  line-height: 1.3;
}

.paper p {
  max-width: 720px;
  margin: 0 0 10px;
}

.authors,
.paper-links,
.media-links {
  color: var(--muted);
  font-size: 14px;
}

.paper-links,
.media-links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-top: 12px;
}

.paper-links > * + *,
.media-links > * + * {
  position: relative;
}

.paper-links > * + *::before,
.media-links > * + *::before {
  content: ".";
  position: absolute;
  left: -7px;
  color: var(--quiet);
}

.abstract-toggle {
  max-width: 720px;
  margin-top: 12px;
  color: var(--muted);
  font-size: 15px;
}

.abstract-toggle summary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  width: fit-content;
  color: var(--bu-green);
  cursor: pointer;
  font-size: 14px;
  font-weight: 700;
  list-style: none;
}

.abstract-toggle summary::-webkit-details-marker {
  display: none;
}

.abstract-toggle summary::before {
  content: "+";
  display: inline-grid;
  width: 18px;
  height: 18px;
  place-items: center;
  border: 1px solid var(--bu-green);
  color: var(--bu-green);
  font-size: 14px;
  line-height: 1;
}

.abstract-toggle[open] summary::before {
  content: "-";
}

.abstract-toggle summary:hover,
.abstract-toggle summary:focus-visible {
  color: var(--bu-red);
}

.abstract-toggle summary:hover::before,
.abstract-toggle summary:focus-visible::before {
  border-color: var(--bu-red);
  color: var(--bu-red);
}

.abstract-toggle p {
  margin: 10px 0 0;
  color: var(--muted);
}

.featured-paper {
  margin-top: 18px;
  padding: 22px 26px 22px 24px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--bu-red);
  background: var(--paper);
}

.paper-status {
  display: inline-flex;
  width: fit-content;
  margin: 2px 0 10px;
  padding: 2px 7px 3px;
  border: 1px solid var(--accent);
  color: var(--accent);
  font-size: 11px;
  letter-spacing: 0.12em;
  line-height: 1.2;
  text-transform: uppercase;
}

.media-links {
  margin-top: 6px;
}

.media-links span {
  color: var(--quiet);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.two-column {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 38px;
  padding-top: 4px;
}

.two-column p {
  margin: 0;
  color: var(--muted);
}

@media (max-width: 820px) {
  .site-header {
    position: static;
    align-items: flex-start;
    flex-direction: column;
    gap: 16px;
    padding: 16px 24px;
  }

  .nav {
    align-self: stretch;
    width: 100%;
    justify-content: center;
    gap: 12px 18px;
  }

  .page-shell {
    grid-template-columns: 1fr;
    margin-top: 30px;
  }

  .profile {
    position: static;
    display: block;
  }

  .portrait {
    max-width: 224px;
    margin-inline: auto;
  }

  .profile h1 {
    margin-top: 18px;
    text-align: center;
  }

  .role {
    text-align: center;
  }

  .profile-block {
    text-align: center;
  }

  address {
    justify-items: center;
    text-align: center;
  }
}

@media (max-width: 560px) {
  body {
    font-size: 15px;
    line-height: 1.6;
  }

  .site-header {
    gap: 14px;
    padding: 14px 16px;
  }

  .institution,
  .nav {
    font-size: 12px;
    letter-spacing: 0.12em;
  }

  .institution {
    flex-wrap: wrap;
    gap: 10px 14px;
  }

  .bu-logo {
    width: 142px;
  }

  .department-name {
    white-space: normal;
  }

  .page-shell {
    width: min(100% - 28px, 1052px);
    margin: 28px auto 56px;
  }

  .profile h1 {
    font-size: 28px;
  }

  .intro-section {
    margin-bottom: 34px;
  }

  .intro-section p {
    font-size: 17px;
  }

  .section-block {
    margin-top: 34px;
  }

  #research,
  #teaching,
  #contact {
    scroll-margin-top: 18px;
  }

  .paper h3 {
    font-size: 19px;
  }

  .featured-paper {
    padding: 18px 16px 18px 18px;
  }

  .two-column {
    grid-template-columns: 1fr;
  }
}