@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;500;600;700&display=swap');

:root {
  --green-dark: #244f20;
  --green: #557f4d;
  --green-light: #dfead8;
  --yellow: #f4e7a6;
  --yellow-light: #faf6d9;
  --cream: #fffdf5;
  --text: #222622;
  --muted: #596057;
  --border: #dce4d7;
  --max-width: 1180px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: "DM Sans", Arial, sans-serif;
  color: var(--text);
  background: var(--cream);
  font-size: 17px;
  line-height: 1.45;
}

.top-bar {
  height: 8px;
  background: var(--green-dark);
}

.site-header {
  background: var(--cream);
  border-bottom: 1px solid var(--border);
}

.nav {
  max-width: var(--max-width);
  margin: 0 auto;
  min-height: 68px;
  padding: 0 30px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-name {
  color: var(--green-dark);
  text-decoration: none;
  font-weight: 700;
  font-size: 20px;
  letter-spacing: .03em;
}

.nav-links { display: flex; gap: 8px; }

.tab-button {
  border: 0;
  background: transparent;
  color: var(--text);
  padding: 10px 18px;
  border-radius: 7px;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}

.tab-button:hover { background: var(--green-light); }

.tab-button.active {
  background: var(--yellow);
  color: var(--green-dark);
}

main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 42px 30px 65px;
}

.tab-content { display: none; }
.tab-content.active { display: block; }

/* Profile area */
.intro {
  display: grid;
  grid-template-columns: 320px minmax(0, 1fr);
  gap: 52px;
  align-items: start;
  margin-bottom: 58px;
}

.photo-column {
  display: flex;
  justify-content: flex-start;
}

.profile-photo,
.photo-placeholder {
  width: 290px;
  height: 350px;
  object-fit: cover;
  border-radius: 2px;
}

.photo-placeholder {
  background: linear-gradient(135deg, var(--green-light), var(--yellow-light));
  border: 2px solid #d1ddca;
  color: var(--green-dark);
  text-align: center;
  font-weight: 700;
  letter-spacing: .08em;
  align-items: center;
  justify-content: center;
}

.intro-text {
  padding-top: 2px;
  max-width: 760px;
}

h1 {
  margin: 0 0 12px;
  color: var(--green-dark);
  font-size: 34px;
  line-height: 1.15;
  letter-spacing: -.02em;
}

.position {
  margin: 0 0 21px;
  font-size: 20px;
  line-height: 1.3;
}

.links { margin: 0 0 22px; }

.welcome {
  font-weight: 700;
  color: var(--green-dark);
  font-size: 20px;
}

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

/* Research layout: single full-width column */
.research-area {
  display: block;
}

.research {
  width: 100%;
  min-width: 0;
}

.research h2 {
  color: var(--green-dark);
  font-size: 28px;
  margin: 0 0 22px;
  line-height: 1.2;
}

.section-break {
  margin-top: 43px !important;
}

.publication-list {
  display: block;
}

.paper {
  margin-bottom: 38px;
  min-width: 0;
}

.paper h3 {
  font-size: 18px;
  line-height: 1.28;
  margin: 0 0 2px;
  font-weight: 700;
}

.paper p {
  margin: 0;
}

.citation {
  font-style: italic;
}

.paper p.citation a {
  font-weight: 400;
  font-style: italic;
  color: #286255;
  text-decoration: none;
}

/* Co-author names: no color, no underline */
.paper p a {
  color: var(--text);
  text-decoration: none;
}

.paper p a:hover {
  color: var(--green-dark);
}

.status {
  font-style: italic;
}

a {
  color: #286255;
  text-decoration: underline;
  text-underline-offset: 2px;
}

.paper h3 a {
  color: var(--text);
  text-decoration: none;
}

.paper h3 a:hover {
  color: var(--green-dark);
  text-decoration: underline;
}

/* Working-paper arrow + abstract */
.paper-title-row {
  display: grid;
  grid-template-columns: 22px minmax(0, 1fr);
  column-gap: 5px;
  align-items: start;
}

.abstract-toggle {
  border: 0;
  background: transparent;
  color: var(--green-dark);
  width: 22px;
  height: 25px;
  padding: 0;
  margin: 0;
  cursor: pointer;
  font-size: 27px;
  line-height: 21px;
  text-align: center;
}

.arrow {
  display: inline-block;
  transition: transform .18s ease;
}

.abstract-toggle[aria-expanded="true"] .arrow {
  transform: rotate(90deg);
}

.abstract {
  margin: 10px 0 0 27px;
  padding: 11px 15px;
  border-left: 3px solid var(--yellow);
  background: var(--yellow-light);
  color: #363b35;
  font-size: 15.5px;
  line-height: 1.5;
}

.abstract p { margin: 0; }

.abstract strong { color: var(--green-dark); }

/* Sidebar */
.research-sidebar {
  padding-top: 3px;
}

.sidebar-box {
  border-top: 3px solid var(--green);
  padding: 14px 0 17px;
  margin-bottom: 24px;
}

.sidebar-box h3 {
  color: var(--green-dark);
  font-size: 17px;
  margin: 0 0 9px;
}

.sidebar-box p {
  margin: 5px 0;
  color: var(--muted);
  font-size: 15px;
}

/* Teaching */
.page-section { max-width: 850px; }

.page-section > h2 {
  color: var(--green-dark);
  font-size: 28px;
  margin-bottom: 20px;
}

.page-section > h3 {
  color: var(--green-dark);
  margin-top: 38px;
  font-size: 23px;
}

.course {
  border-left: 5px solid var(--yellow);
  background: white;
  padding: 15px 20px;
  margin: 18px 0;
  box-shadow: 0 2px 10px rgba(36, 79, 32, .06);
}

.course h4 {
  color: var(--green-dark);
  font-size: 19px;
  margin: 0 0 5px;
}

.course p { margin: 0; }

footer {
  border-top: 1px solid var(--border);
  padding: 22px 30px;
  text-align: center;
  color: var(--muted);
  font-size: 14px;
}

/* Mobile */
@media (max-width: 900px) {
  .research-area {
    grid-template-columns: 1fr;
    gap: 30px;
  }

  .research-sidebar {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
  }

  .sidebar-box { margin-bottom: 0; }
}

@media (max-width: 760px) {
  body { font-size: 16px; }

  .nav {
    padding: 15px 20px;
    flex-direction: column;
    align-items: flex-start;
    gap: 11px;
  }

  .nav-links { width: 100%; }
  .tab-button { flex: 1; }

  main { padding: 32px 20px 50px; }

  .intro {
    grid-template-columns: 1fr;
    gap: 28px;
    margin-bottom: 48px;
  }

  .photo-column { justify-content: flex-start; }

  .profile-photo,
  .photo-placeholder {
    width: min(100%, 290px);
    height: 350px;
  }

  h1 { font-size: 30px; }
  .position { font-size: 18px; }

  .publication-list {
    grid-template-columns: 1fr;
    row-gap: 0;
  }

  .research-sidebar {
    grid-template-columns: 1fr;
  }

  .research h2,
  .page-section > h2 {
    font-size: 25px;
  }
}

.social-link {
    color: var(--green-dark);
    font-size: 22px;
    text-decoration: none;
    vertical-align: -2px;
}

.social-link:hover {
    color: var(--green);
}