:root {
  --color-bg: #ffffff;
  --color-text: #2b2b2b;
  --color-muted: #6b6b6b;
  --color-accent: #7c5c46;
  --color-border: #e7e2dc;
  --font-serif: "Georgia", "Iowan Old Style", serif;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  --max-width: 760px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.3;
}

a { color: var(--color-accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* Header / nav */
.site-header {
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  background: var(--color-bg);
  z-index: 10;
}

.site-nav {
  max-width: 960px;
  margin: 0 auto;
  padding: 1rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
}

.site-nav__brand {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  font-weight: bold;
  color: var(--color-text);
}
.site-nav__brand:hover { text-decoration: none; opacity: 0.7; }

.site-nav__links {
  list-style: none;
  display: flex;
  gap: 1.5rem;
  margin: 0;
  padding: 0;
}

.site-nav__links a {
  color: var(--color-muted);
  font-size: 0.95rem;
}

.site-nav__links a.is-active,
.site-nav__links a:hover {
  color: var(--color-accent);
}

.nav-toggle, .nav-toggle__label { display: none; }

@media (max-width: 640px) {
  .nav-toggle__label {
    display: block;
    cursor: pointer;
    font-size: 1.3rem;
  }
  .site-nav__links {
    flex-basis: 100%;
    flex-direction: column;
    gap: 0.75rem;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.25s ease;
    width: 100%;
  }
  .nav-toggle:checked ~ .site-nav__links {
    max-height: 400px;
    margin-top: 1rem;
  }
}

/* Banner + avatar */
.banner {
  height: 260px;
  background-color: var(--color-border);
  background-size: cover;
  background-position: center;
}

.profile {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
  text-align: center;
}

.profile__avatar {
  width: 128px;
  height: 128px;
  border-radius: 50%;
  object-fit: cover;
  border: 4px solid var(--color-bg);
  margin-top: -64px;
  background: var(--color-border);
}

.profile__name {
  font-family: var(--font-serif);
  font-size: 2rem;
  margin: 0.75rem 0 0.25rem;
}

.profile__role,
.profile__institution {
  color: var(--color-muted);
  margin: 0.15rem 0;
}

.social-links {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1.25rem;
  padding: 1rem 0 0;
  margin: 0;
  font-size: 0.9rem;
}

/* About / page content */
.about, .page {
  max-width: var(--max-width);
  margin: 3rem auto;
  padding: 0 1.5rem;
}

.about h2, .page h1 {
  font-family: var(--font-serif);
  font-size: 1.6rem;
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 0.5rem;
}

.about__tagline {
  font-style: italic;
  color: var(--color-muted);
}

.page ul, .page ol {
  padding-left: 1.25rem;
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--color-border);
  text-align: center;
  color: var(--color-muted);
  font-size: 0.85rem;
  padding: 2rem 1.5rem;
  margin-top: 3rem;
}

.group-section-title {
  font-family: var(--font-serif);
  font-size: 1.3rem;
  margin-top: 2.5rem;
}

.member-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
  gap: 1.75rem 1rem;
  margin-top: 1.25rem;
  text-align: center;
}

.member__photo {
  width: 96px;
  height: 96px;
  border-radius: 50%;
  object-fit: cover;
  background: var(--color-border);
  display: block;
  margin: 0 auto 0.6rem;
  border: 2px solid var(--color-border);
  transition: border-color 0.2s ease;
}

.member a:hover .member__photo {
  border-color: var(--color-accent);
}

.member__name {
  font-weight: 600;
  margin: 0;
  font-size: 0.95rem;
}

.member__role {
  color: var(--color-muted);
  font-size: 0.85rem;
  margin: 0.15rem 0 0;
}

.member__now {
  font-size: 0.8rem;
  color: var(--color-accent);
  margin: 0.2rem 0 0;
  font-style: italic;
}

.member__dates {
  font-size: 0.8rem;
  color: var(--color-muted);
  margin: 0.2rem 0 0;
}


/* research page */
.research-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
  margin-top: 1.5rem;
}

.research-card {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.research-card__media {
  width: 100%;
}

.research-card__media img {
  width: 100%;
  height: 160px;
  object-fit: cover;
  border-radius: 6px;
  background: var(--color-border);
  display: block;
}

.research-card__body {
  flex: 1;
  min-width: 0;
}

.research-card__title {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  margin: 0 0 0.5rem;
}

.research-card__title a {
  color: var(--color-text);
}

.research-card__title a:hover {
  color: var(--color-accent);
}

.research-card__description {
  color: var(--color-muted);
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.3;
}

@media (max-width: 700px) {
  .research-list {
    grid-template-columns: 1fr;
  }
}

.research-intro p {
  line-height: 1.35;
}

.research-intro p:last-of-type {
  margin-bottom: 4rem;
}