:root {
  --unt-green: #00853e;
  --unt-green-dark: #046a32;
  --unt-green-light: #e3f2e9;
  --ink: #14171a;
  --ink-soft: #23282c;
  --surface-light: #f5f7f6;
  --text-body: #2b2f2e;
  --text-muted: #5b6360;
  --border-soft: #e2e7e4;
}

body {
  font-family: "Inter", sans-serif;
  color: var(--text-body);
  line-height: 1.7;
}

h1, h2, h3, h4, h5, h6,
.navbar-brand,
.nav-link,
.btn {
  font-family: "Poppins", sans-serif;
}

a {
  color: var(--unt-green-dark);
}

a:hover {
  color: var(--unt-green);
}

/* Navbar */
.navbar {
  background-color: #0d3b22;
  padding: 8px 0;
}

.navbar-brand {
  font-weight: 700;
  color: #fff !important;
  display: flex;
  align-items: center;
  gap: 10px;
}

.navbar-brand a {
  color: inherit;
  text-decoration: none;
  display: flex;
  align-items: center;
}

.brand-logo-lockup {
  height: 58px;
  width: auto;
}

.brand-icon-chip {
  border-radius: 8px;
  background: #fff;
  padding: 2px;
}

.navbar-brand .brand-sub {
  display: block;
  font-family: "Inter", sans-serif;
  font-size: 0.7rem;
  font-weight: 400;
  color: #b7d4c4;
  letter-spacing: 0.3px;
}

.nav-link {
  font-weight: 500;
  color: #d7dbd8 !important;
}

.nav-link:hover,
.nav-link.active {
  color: #fff !important;
}

.nav-link.active {
  position: relative;
}

.nav-link.active::after {
  content: "";
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: 2px;
  height: 2px;
  background: var(--unt-green);
  border-radius: 2px;
}

/* Hero */
.hero-section {
  background: linear-gradient(135deg, var(--ink) 0%, var(--unt-green-dark) 100%);
  color: #fff;
  padding: 90px 0 70px;
  text-align: center;
}

.hero-eyebrow {
  text-transform: uppercase;
  letter-spacing: 2px;
  font-size: 0.8rem;
  font-weight: 600;
  color: #a9e8c3;
  margin-bottom: 14px;
}

.hero-section h1 {
  font-weight: 700;
  font-size: 2.6rem;
  margin-bottom: 16px;
}

.hero-section .lead {
  max-width: 720px;
  margin: 0 auto 28px;
  color: #e7ede9;
}

.hero-affiliation {
  font-weight: 500;
  font-size: 1.15rem;
  line-height: 1.5;
  color: #a9e8c3;
  margin-bottom: 20px;
}

.page-hero {
  padding: 60px 0 50px;
}

.page-hero h1 {
  font-size: 2.1rem;
}

/* Buttons */
.btn-green {
  background-color: var(--unt-green);
  border-color: var(--unt-green);
  color: #fff;
  font-weight: 600;
}

.btn-green:hover {
  background-color: var(--unt-green-dark);
  border-color: var(--unt-green-dark);
  color: #fff;
}

.btn-outline-green {
  background-color: transparent;
  border: 1px solid rgba(255, 255, 255, 0.6);
  color: #fff;
  font-weight: 600;
}

.btn-outline-green:hover {
  background-color: rgba(255, 255, 255, 0.12);
  color: #fff;
}

/* Section titles */
.section-title {
  position: relative;
  margin-bottom: 35px;
  padding-bottom: 18px;
  font-weight: 700;
  font-size: 1.85rem;
  letter-spacing: 0.2px;
  color: #074716;
}

.section-title::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 56px;
  height: 4px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--unt-green), var(--unt-green-dark));
}

.section-title.text-center::after {
  left: 50%;
  transform: translateX(-50%);
}

.section-eyebrow {
  text-transform: uppercase;
  letter-spacing: 1.5px;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--unt-green-dark);
  margin-bottom: 8px;
  display: block;
}

.bg-surface {
  background-color: var(--surface-light);
}

/* Cards */
.card {
  border: none;
  border-radius: 10px;
  box-shadow: 0 5px 15px rgba(20, 23, 26, 0.07);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 10px 24px rgba(20, 23, 26, 0.1);
}

/* Research area cards */
.research-card {
  height: 100%;
  padding: 28px;
}

.research-card .research-icon {
  width: 52px;
  height: 52px;
  border-radius: 12px;
  background: var(--unt-green-light);
  color: var(--unt-green-dark);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  margin-bottom: 18px;
}

/* Team cards */
.team-card {
  text-align: center;
  padding: 30px 22px;
  height: 100%;
}

.team-photo {
  width: 140px;
  height: 140px;
  border-radius: 50%;
  object-fit: cover;
  margin: 0 auto 18px;
  border: 4px solid var(--unt-green-light);
}

.team-photo-placeholder {
  width: 140px;
  height: 140px;
  border-radius: 50%;
  margin: 0 auto 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--ink);
  color: #fff;
  font-family: "Poppins", sans-serif;
  font-weight: 600;
  font-size: 2rem;
  border: 4px solid var(--unt-green-light);
}

.team-role {
  color: var(--unt-green-dark);
  font-weight: 600;
  font-size: 0.9rem;
  margin-bottom: 10px;
}

.team-card.pi-card {
  text-align: left;
  padding: 36px;
}

.team-card.pi-card .team-photo,
.team-card.pi-card .team-photo-placeholder {
  margin: 0;
  width: 170px;
  height: 170px;
}

.social-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  background-color: var(--ink);
  color: white;
  border-radius: 50%;
  margin-right: 8px;
  transition: all 0.3s ease;
}

.social-icon:hover {
  background-color: var(--unt-green);
  color: #fff;
  transform: translateY(-3px);
}

/* Publications */
.pub-content {
  max-width: 900px;
  margin: 0 auto;
}

.pub-intro {
  color: var(--text-muted);
  margin-bottom: 2.5rem;
}

.pub-section {
  margin-bottom: 2.5rem;
}

.pub-section-title {
  font-size: 1.8rem;
  font-weight: 800;
  color: #074716;
  margin: 0 0 0.75rem;
}

.pub-year-heading {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--unt-green-dark);
  margin: 1.5rem 0 0.5rem;
  padding-bottom: 4px;
  border-bottom: 2px solid var(--unt-green-light);
}

.pub-list {
  list-style: decimal;
  margin: 0 0 0 1.5rem;
  padding: 0;
}

.pub-entry {
  margin-bottom: 0.9rem;
  font-size: 1.02rem;
  line-height: 1.65;
  color: var(--text-body);
  padding-left: 0.25rem;
}

.pub-entry strong {
  color: var(--ink);
}

.pub-meta {
  color: var(--text-muted);
  font-size: 0.92rem;
}

/* Projects */
.project-card {
  padding: 28px;
  height: 100%;
}

.funding-tag {
  display: inline-block;
  background: var(--ink);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.4px;
  padding: 4px 10px;
  border-radius: 4px;
  margin-bottom: 12px;
}

.funding-tag.status-ongoing {
  background: var(--unt-green);
}

/* News / accordion */
.accordion-button:not(.collapsed) {
  background-color: var(--unt-green-light);
  color: var(--unt-green-dark);
  box-shadow: none;
}

.accordion-button:focus {
  box-shadow: none;
  border-color: var(--unt-green);
}

.news-date {
  color: var(--unt-green-dark);
  font-weight: 600;
  font-size: 0.85rem;
}

/* Model diagram carousel */
.model-showcase-panel {
  max-width: 1080px;
  margin: 0 auto;
  background: #fff;
  border-radius: 20px;
  border-top: 4px solid var(--unt-green);
  box-shadow: 0 20px 45px rgba(20, 23, 26, 0.12);
  padding: 40px 40px 32px;
}

.model-carousel {
  max-width: 980px;
  margin: 0 auto;
}

.model-tag {
  display: inline-block;
  background: var(--unt-green-light);
  color: var(--unt-green-dark);
  font-weight: 700;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  padding: 4px 12px;
  border-radius: 20px;
  margin-bottom: 12px;
}

.model-frame {
  height: 500px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #fff;
  border-radius: 12px;
  padding: 20px;
  border: 1px solid var(--border-soft);
}

.model-frame img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
}

.model-caption {
  padding: 24px 10px 0;
  text-align: center;
}

.model-caption h5 {
  color: var(--ink);
  font-weight: 700;
  margin-bottom: 10px;
}

.model-caption p {
  max-width: 720px;
  margin-left: auto;
  margin-right: auto;
}

.model-carousel .carousel-control-prev,
.model-carousel .carousel-control-next {
  top: 0;
  height: 500px;
  width: 56px;
}

.model-carousel .carousel-control-prev-icon,
.model-carousel .carousel-control-next-icon {
  background-color: var(--ink);
  background-size: 45%;
  border-radius: 50%;
  width: 2.75rem;
  height: 2.75rem;
  opacity: 0.85;
}

.model-carousel .carousel-control-prev:hover .carousel-control-prev-icon,
.model-carousel .carousel-control-next:hover .carousel-control-next-icon {
  opacity: 1;
}

.model-carousel .carousel-indicators {
  position: static;
  margin-top: 18px;
  margin-bottom: 0;
}

.model-carousel .carousel-indicators [data-bs-target] {
  background-color: var(--unt-green);
  width: 10px;
  height: 10px;
  border-radius: 50%;
  border: none;
  opacity: 0.35;
}

.model-carousel .carousel-indicators .active {
  opacity: 1;
}

@media (max-width: 767px) {
  .model-showcase-panel {
    padding: 24px 16px 20px;
    border-radius: 14px;
  }

  .model-frame,
  .model-carousel .carousel-control-prev,
  .model-carousel .carousel-control-next {
    height: 280px;
  }
}

/* Footer */
footer.site-footer {
  background-color: #0d3b22;
  color: #cfd4d1;
  padding: 40px 0 24px;
}

footer.site-footer a {
  color: #cfd4d1;
}

footer.site-footer a:hover {
  color: #fff;
}

footer.site-footer hr {
  border-color: rgba(255, 255, 255, 0.1);
  margin: 24px 0 18px;
}

/* Contact / info card */
.info-card {
  padding: 30px;
}

.info-card h4 {
  margin-bottom: 18px;
}

@media (max-width: 991px) {
  .team-card.pi-card {
    text-align: center;
  }

  .team-card.pi-card .team-photo,
  .team-card.pi-card .team-photo-placeholder {
    margin: 0 auto 20px;
  }
}