/* Reset and global styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  line-height: 1.6;
  color: #2d3748;
  background: linear-gradient(135deg, #e6f2ff 0%, #c8e6f5 100%);
  min-height: 100vh;
}

/* Header styles */
header {
  padding: 1.5rem 3rem;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 1400px;
  margin: 0 auto;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  cursor: pointer;
  transition: transform 0.3s ease;
}

.logo-text {
  font-size: 2rem;
  font-weight: bold;
  background: linear-gradient(135deg, #1e4a7a 0%, #2b7a9e 50%, #7cb342 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.logo-icon {
  width: 40px;
  height: 40px;
  object-fit: contain;
}

.logo:hover {
  transform: scale(1.05);
}

nav ul {
  list-style: none;
  display: flex;
  gap: 2rem;
}

nav a {
  color: #333;
  text-decoration: none;
  font-weight: 500;
  padding: 0.5rem 1rem;
  border-radius: 8px;
  transition: all 0.3s ease;
  position: relative;
}

nav a::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, #2b7a9e, #7cb342);
  transform: translateX(-50%);
  transition: width 0.3s ease;
}

nav a:hover {
  background: rgba(43, 122, 158, 0.1);
  color: #2b7a9e;
}

nav a:hover::after {
  width: 80%;
}

/* Collaborators Container */
.collaborators-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 4rem 2rem;
}

.collaborators-container h1 {
  text-align: center;
  font-size: 3.5rem;
  background: linear-gradient(135deg, #1e3a5f 0%, #2d7fa5 50%, #7cb342 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 1rem;
  font-weight: 800;
  letter-spacing: -1px;
  animation: fadeInDown 1s ease;
}

@keyframes fadeInDown {
  from {
    opacity: 0;
    transform: translateY(-30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.collaborators-subtitle {
  text-align: center;
  font-size: 1.3rem;
  color: #4a5568;
  margin-bottom: 4rem;
  animation: fadeIn 1s ease 0.3s both;
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

/* Section Styles */
section {
  margin-bottom: 5rem;
  animation: fadeInUp 0.8s ease both;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

section h2 {
  font-size: 2.5rem;
  color: #1e3a5f;
  margin-bottom: 3rem;
  font-weight: 700;
  text-align: center;
}

/* Collaborators Grid */
.collaborators-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 3rem;
}

/* Faculty advisors: 4 columns with compact card styling */
.advisors-grid {
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}

.advisors-grid .collaborator-card-container {
  height: 420px;
}

.advisors-grid .collaborator-front,
.advisors-grid .collaborator-back {
  padding: 1.5rem 1rem;
}

.advisors-grid .collaborator-front h3 {
  font-size: 1.2rem;
  margin-bottom: 0.5rem;
}

.advisors-grid .collaborator-photo {
  width: 100px;
  height: 100px;
  margin: 0 auto 0.75rem;
}

.advisors-grid .collaborator-role {
  font-size: 0.9rem;
  margin-bottom: 0.75rem;
}

.advisors-grid .collaborator-bio {
  font-size: 0.9rem;
  line-height: 1.6;
}

@media (max-width: 1100px) {
  .advisors-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 2.5rem;
  }

  .advisors-grid .collaborator-card-container {
    height: 480px;
  }

  .advisors-grid .collaborator-front,
  .advisors-grid .collaborator-back {
    padding: 3rem 2.5rem;
  }

  .advisors-grid .collaborator-front h3 {
    font-size: 1.9rem;
    margin-bottom: unset;
  }

  .advisors-grid .collaborator-photo {
    width: 150px;
    height: 150px;
    margin: 0 auto 1.5rem;
  }

  .advisors-grid .collaborator-role {
    font-size: 1.2rem;
    margin-bottom: 1.5rem;
  }

  .advisors-grid .collaborator-bio {
    font-size: 1.1rem;
    line-height: 1.8;
  }
}

@media (max-width: 768px) {
  .advisors-grid {
    grid-template-columns: 1fr;
  }
}

/* Card Container for flip effect */
.collaborator-card-container {
  perspective: 1000px;
  height: 480px;
}

/* Main Card with flip functionality */
.collaborator-card {
  width: 100%;
  height: 100%;
  position: relative;
  transform-style: preserve-3d;
  transition: transform 0.6s cubic-bezier(0.68, -0.55, 0.27, 1.55);
  cursor: pointer;
}

.collaborator-card.flipped {
  transform: rotateY(180deg);
}

.collaborator-card:hover {
  transform: translateY(-10px);
}

.collaborator-card.flipped:hover {
  transform: rotateY(180deg) translateY(-10px);
}

/* Front and Back faces - CRITICAL FIX */
.collaborator-front,
.collaborator-back {
  position: absolute;
  width: 100%;
  height: 100%;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  border-radius: 20px;
  background: linear-gradient(
    135deg,
    rgba(255, 255, 255, 0.98),
    rgba(230, 242, 255, 0.95)
  );
  padding: 3rem 2.5rem;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
  border: 2px solid rgba(45, 127, 165, 0.2);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
}

.collaborator-front {
  transform: rotateY(0deg);
  z-index: 2;
}

.collaborator-back {
  transform: rotateY(180deg);
  padding: 2.5rem 2rem;
}

/* Circular Photo Styling */
.collaborator-photo {
  width: 150px;
  height: 150px;
  aspect-ratio: 1 / 1;
  margin: 0 auto 1.5rem;
  border-radius: 50%;
  overflow: hidden;
  border: 4px solid rgba(45, 127, 165, 0.3);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
  transition: all 0.3s ease;
  flex-shrink: 0;
}

.collaborator-photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 20%;
  display: block;
}

.collaborator-card:hover .collaborator-photo {
  border-color: #7cb342;
  transform: scale(1.05);
  box-shadow: 0 12px 25px rgba(0, 0, 0, 0.2);
}

.collaborator-front h3 {
  font-size: 1.9rem;
  color: #1e3a5f;
  margin-bottom: 0.8rem;
  font-weight: 700;
}

.collaborator-role {
  font-size: 1.2rem;
  color: #7cb342;
  font-weight: 600;
  margin-bottom: 1.5rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.collaborator-bio {
  color: #4a5568;
  font-size: 1.1rem;
  line-height: 1.8;
}

/* Back side bio styling */
.bio {
  color: #4a5568;
  font-size: 1.05rem;
  line-height: 1.75;
  text-align: center;
  padding: 0 1rem;
}

.bio h3 {
  color: #1e3a5f;
  margin-bottom: 1rem;
  font-size: 1.4rem;
  font-weight: 700;
}

.bio p {
  font-size: 1rem;
  line-height: 1.7;
  color: #4a5568;
}

/* Support Info Section */
.support-info {
  margin-top: 4rem;
}

.info-box {
  background: linear-gradient(
    135deg,
    rgba(255, 255, 255, 0.98),
    rgba(230, 242, 255, 0.95)
  );
  border-radius: 20px;
  padding: 3rem;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
  border: 2px solid rgba(45, 127, 165, 0.2);
}

.info-box h3 {
  font-size: 2rem;
  color: #1e3a5f;
  margin-bottom: 2.5rem;
  text-align: center;
  font-weight: 700;
}

.support-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
}

.support-item {
  display: flex;
  align-items: center;
  gap: 1.2rem;
  background: rgba(255, 255, 255, 0.6);
  padding: 1.8rem;
  border-radius: 12px;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.05);
  transition: all 0.3s ease;
}

.support-item:hover {
  transform: translateX(10px);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.1);
}

.support-icon {
  font-size: 2rem;
  flex-shrink: 0;
}

.support-item p {
  font-size: 1.1rem;
  color: #333;
  font-weight: 500;
  line-height: 1.6;
}

/* Responsive Design */
@media (max-width: 1024px) {
  .collaborators-grid {
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2.5rem;
  }

  .collaborator-card-container {
    height: 460px;
  }
}

@media (max-width: 768px) {
  .collaborators-container {
    padding: 3rem 1.5rem;
  }

  .collaborators-container h1 {
    font-size: 2.5rem;
  }

  .collaborators-subtitle {
    font-size: 1.1rem;
    margin-bottom: 3rem;
  }

  section h2 {
    font-size: 2rem;
    margin-bottom: 2rem;
  }

  .collaborators-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .collaborator-card-container {
    height: 440px;
  }

  .collaborator-front,
  .collaborator-back {
    justify-content: flex-start;
    padding-top: 2rem;
  }

  .support-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

  nav ul {
    gap: 1rem;
  }

  nav a {
    padding: 0.4rem 0.8rem;
    font-size: 0.9rem;
  }
}

@media (max-width: 480px) {
  header {
    padding: 1rem 1.5rem;
  }

  .collaborators-container {
    padding: 2rem 1rem;
  }

  .collaborators-container h1 {
    font-size: 2rem;
  }

  .collaborators-subtitle {
    font-size: 1rem;
  }

  section h2 {
    font-size: 1.8rem;
  }

  .collaborator-card-container {
    height: 400px;
  }

  .collaborator-front,
  .collaborator-back {
    padding: 2rem 1.5rem;
    justify-content: flex-start;
    padding-top: 1.5rem;
  }

  .collaborator-photo {
    width: 120px;
    height: 120px;
  }

  .collaborator-front h3 {
    font-size: 1.6rem;
  }

  .info-box {
    padding: 2rem;
  }

  .info-box h3 {
    font-size: 1.6rem;
  }

  nav ul {
    flex-wrap: wrap;
    gap: 0.5rem;
    justify-content: center;
  }

  .bio h3 {
    font-size: 1.2rem;
  }

  .bio p {
    font-size: 0.95rem;
  }
}