/* =============================================
   GT Brand Tokens
   ============================================= */
:root {
  --gt-navy:       #003057;
  --gt-gold:       #B3A369;
  --gt-gold-dark:  #857437;
  --gt-white:      #ffffff;
  --gt-gray:       #54585A;
  --gt-gray-light: #D6DBD4;
  --gt-ivory:      #F9F6E5;
  --border:        #e2e6ea;
  --muted:         #5b6275;
  --radius:        8px;
}

/* =============================================
   Reset & Base
   ============================================= */
*, *::before, *::after { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "Roboto", system-ui, -apple-system, Arial, sans-serif;
  font-size: 1rem;
  line-height: 1.65;
  color: #222;
  background: var(--gt-white);
}

h1, h2, h3, h4 {
  color: var(--gt-navy);
  font-weight: 700;
  line-height: 1.25;
  margin-top: 0;
}

a { color: var(--gt-navy); text-underline-offset: 2px; }
a:hover { color: var(--gt-gold-dark); }
img { max-width: 100%; height: auto; display: block; }

/* =============================================
   Accessibility
   ============================================= */
.skip-link {
  position: absolute; left: -9999px; top: auto;
  width: 1px; height: 1px; overflow: hidden;
}
.skip-link:focus {
  position: fixed; left: 1rem; top: 1rem; z-index: 9999;
  width: auto; height: auto;
  background: var(--gt-gold); color: var(--gt-navy);
  padding: .5rem .875rem; border-radius: 4px;
  font-weight: 700; text-decoration: none;
}
:focus-visible { outline: 3px solid var(--gt-gold); outline-offset: 2px; }

/* =============================================
   Header / Nav
   ============================================= */
.site-header {
  background: var(--gt-navy);
  border-bottom: 4px solid var(--gt-gold);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  max-width: 1140px;
  margin: 0 auto;
  padding: .75rem 1.5rem;
  display: flex;
  align-items: center;
  gap: 1rem;
}

.site-title {
  color: var(--gt-white);
  font-weight: 700;
  font-size: 1.05rem;
  text-decoration: none;
  white-space: nowrap;
  flex-shrink: 0;
}
.site-title:hover { color: var(--gt-gold); }

.site-nav {
  margin-left: auto;
  display: flex;
  flex-wrap: wrap;
  gap: .1rem;
}

.site-nav a {
  color: rgba(255,255,255,.85);
  text-decoration: none;
  font-size: .88rem;
  padding: .35rem .65rem;
  border-radius: 4px;
  transition: background .15s, color .15s;
}
.site-nav a:hover,
.site-nav a.active {
  background: rgba(255,255,255,.15);
  color: var(--gt-white);
}

/* =============================================
   Footer
   ============================================= */
.site-footer {
  background: var(--gt-navy);
  border-top: 4px solid var(--gt-gold);
  color: rgba(255,255,255,.75);
  padding: 2rem 1.5rem;
  margin-top: 4rem;
  font-size: .9rem;
}
.footer-inner { max-width: 1140px; margin: 0 auto; }
.footer-inner p { margin: .25rem 0; }
.footer-links a { color: var(--gt-gold); text-decoration: none; }
.footer-links a:hover { text-decoration: underline; }

/* =============================================
   Buttons
   ============================================= */
.btn {
  display: inline-block;
  padding: .6rem 1.25rem;
  border-radius: 4px;
  font-weight: 600;
  font-size: .95rem;
  text-decoration: none;
  border: 2px solid var(--gt-navy);
  background: var(--gt-navy);
  color: var(--gt-white);
  cursor: pointer;
  transition: background .15s, border-color .15s;
}
.btn:hover { background: #002244; border-color: #002244; color: var(--gt-white); }

.btn.ghost {
  background: transparent;
  border-color: var(--gt-white);
  color: var(--gt-white);
}
.btn.ghost:hover { background: rgba(255,255,255,.15); color: var(--gt-white); }

/* =============================================
   Hero (home page)
   ============================================= */
.hero {
  background: var(--gt-navy);
  color: var(--gt-white);
  padding: 5rem 1.5rem 4rem;
  text-align: center;
}
.hero h1 {
  color: var(--gt-white);
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  max-width: 780px;
  margin: 0 auto 1.25rem;
}
.hero p {
  color: #ccd8e8;
  font-size: 1.1rem;
  max-width: 660px;
  margin: 0 auto 2rem;
}
.hero-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}
.hero .btn {
  background: var(--gt-gold);
  border-color: var(--gt-gold);
  color: var(--gt-navy);
}
.hero .btn:hover { background: #a0903c; border-color: #a0903c; color: var(--gt-navy); }

/* =============================================
   Home page sections
   ============================================= */
.section {
  max-width: 1140px;
  margin: 0 auto;
  padding: 3rem 1.5rem;
}
.section + .section { border-top: 1px solid var(--border); }
.section h2 {
  font-size: 1.6rem;
  margin-bottom: 1rem;
}

/* Research cards */
.research-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.25rem;
  margin-top: 1.5rem;
}
.research-card {
  background: #fff;
  border: 1px solid var(--border);
  border-top: 4px solid var(--gt-gold);
  border-radius: var(--radius);
  padding: 1.4rem;
  box-shadow: 0 1px 4px rgba(0,0,0,.07);
}
.research-card h3 { font-size: 1rem; margin-bottom: .5rem; }
.research-card p  { margin: 0; color: var(--muted); font-size: .95rem; }

/* Platform cards */
.platform-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.25rem;
  margin-top: 1.5rem;
}
.platform-card {
  background: #fff;
  border: 1px solid var(--border);
  border-top: 4px solid var(--gt-gold);
  border-radius: var(--radius);
  padding: 1.25rem;
  box-shadow: 0 1px 4px rgba(0,0,0,.07);
}
.platform-card h3 { font-size: 1rem; margin-bottom: .4rem; }
.platform-card p  { margin: 0; color: var(--muted); font-size: .92rem; }

/* =============================================
   Inner page prose wrapper
   ============================================= */
.page-wrap {
  max-width: 1140px;
  margin: 0 auto;
  padding: 2.5rem 1.5rem 4rem;
}

/* =============================================
   Team page
   ============================================= */
.team-container {
  margin: 2rem 0;
}
.team-card {
  display: flex;
  gap: 1.5rem;
  margin-bottom: 1.5rem;
  align-items: flex-start;
}
.team-photo {
  width: 130px;
  height: 130px;
  object-fit: cover;
  border-radius: var(--radius);
  flex-shrink: 0;
  background: var(--gt-gray-light);
}
.team-info {
  flex: 1;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  background: #fff;
  box-shadow: 0 1px 4px rgba(0,0,0,.07);
}
.team-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: .25rem;
}
.team-header h3 { margin: 0; flex: 1; min-width: 0; }
.team-title { font-weight: 600; color: var(--gt-gray); margin: 0 0 .5rem; }
.team-focus { color: var(--muted); margin-bottom: .75rem; }
.project-tag {
  display: inline-block;
  background: var(--gt-ivory);
  border: 1px solid var(--gt-gray-light);
  color: var(--gt-navy);
  padding: .2rem .6rem;
  border-radius: 999px;
  font-size: .8rem;
  margin: .2rem .2rem .2rem 0;
}
.team-links {
  display: flex;
  gap: .5rem;
  align-items: center;
  flex-shrink: 0;
}
.team-links a {
  color: var(--gt-gray);
  display: flex;
  align-items: center;
  transition: color .15s;
}
.team-links a:hover { color: var(--gt-navy); }
@media (max-width: 640px) {
  .team-card { flex-direction: column; }
  .team-photo { width: 100px; height: 100px; }
  .team-info { width: 100%; }
}

/* =============================================
   Publications page
   ============================================= */
.pub-year {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--gt-navy);
  margin: 2.5rem 0 1rem;
}
.pub-list {}
.pub-card {
  border: 1px solid var(--border);
  border-left: 4px solid var(--gt-gold);
  border-radius: var(--radius);
  padding: 1.1rem 1.25rem;
  background: #fff;
  margin-bottom: 1rem;
}
.pub-title-row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
}
.pub-title-row .pub-title { flex: 1; min-width: 0; }
.pub-chevron {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  color: var(--gt-gray);
  transition: background .15s, color .15s;
}
.pub-chevron:hover {
  background: var(--gt-ivory);
  color: var(--gt-navy);
}
.pub-title { font-weight: 600; color: var(--gt-navy); font-size: 1rem; }
.pub-authors {
  display: flex;
  flex-wrap: wrap;
  gap: .3rem;
  margin: .4rem 0;
}
.author-pill {
  display: inline-block;
  background: transparent;
  border: 1px solid var(--gt-gray-light);
  color: var(--gt-gray);
  padding: .05rem .35rem;
  border-radius: 999px;
  font-size: .65rem;
}
.pub-meta { color: var(--gt-gray); font-size: .85rem; margin: .2rem 0 .6rem; }
.pub-link {
  display: inline-block;
  margin-right: .5rem;
  padding: .15rem .5rem;
  background: var(--gt-ivory);
  border: 1px solid var(--gt-gray-light);
  border-radius: 4px;
  font-size: .8rem;
  color: var(--gt-navy);
  text-decoration: none;
}
.pub-link:hover { background: var(--gt-gold); border-color: var(--gt-gold); }

/* =============================================
   Software page
   ============================================= */
.software-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(270px, 1fr));
  gap: 1.25rem;
  margin-top: 1.5rem;
}
.software-card {
  background: #fff;
  border: 1px solid var(--border);
  border-left: 5px solid var(--gt-gold);
  border-radius: var(--radius);
  padding: 1.25rem 1.4rem;
  box-shadow: 0 1px 4px rgba(0,0,0,.06);
}
.software-card h3 { margin-top: 0; margin-bottom: .4rem; font-size: 1.05rem; }
.software-card p  { margin: 0 0 .5rem; color: var(--muted); font-size: .93rem; }
.software-card a  { font-weight: 600; font-size: .9rem; }

/* =============================================
   Project cards (inner page)
   ============================================= */
.project-card {
  display: flex;
  gap: 1.5rem;
  border: 1px solid var(--border);
  border-left: 5px solid var(--gt-gold);
  border-radius: var(--radius);
  padding: 1.5rem;
  margin-bottom: 1.25rem;
  background: #fff;
  box-shadow: 0 1px 4px rgba(0,0,0,.07);
}
.project-info { flex: 1; }
.project-info p { color: var(--muted); font-size: .93rem; margin: 0; }
.project-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: .4rem;
}
.project-header h3 { margin: 0; flex: 1; min-width: 0; }
.project-icons {
  display: flex;
  gap: .5rem;
  align-items: center;
  flex-shrink: 0;
}
.project-icons a {
  color: var(--gt-gray);
  display: flex;
  align-items: center;
  transition: color .15s;
}
.project-icons a:hover { color: var(--gt-navy); }

/* =============================================
   Research area cards (inner page)
   ============================================= */
.research-area-card {
  border: 1px solid var(--border);
  border-left: 4px solid var(--gt-gold);
  border-radius: var(--radius);
  padding: 1.5rem;
  margin-bottom: 1.25rem;
  background: #fff;
  box-shadow: 0 1px 4px rgba(0,0,0,.07);
}
.research-area-card h3 { margin-top: 0; margin-bottom: .4rem; }
.research-area-card p { color: var(--muted); font-size: .95rem; margin: 0; }

/* =============================================
   Publication filter
   ============================================= */
.pub-filter {
  margin-bottom: 1.5rem;
}
.pub-filter select {
  padding: .35rem .75rem;
  border: 1px solid var(--border);
  border-radius: 4px;
  font-size: .9rem;
  margin-left: .5rem;
}

/* =============================================
   Generic grid / card
   ============================================= */
.card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
}
.grid {
  display: grid;
  gap: 1.25rem;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

/* =============================================
   Responsive
   ============================================= */
@media (max-width: 700px) {
  .header-inner { flex-direction: column; align-items: flex-start; gap: .5rem; }
  .site-nav { margin-left: 0; }
  .hero { padding: 3rem 1rem 2.5rem; }
}