:root {
  --blue: #0f4366;
  --teal: #1a8d7c;
  --accent: #48b5a6;
  --dark: #102d40;
  --muted: #657d92;
  --surface: #ffffff;
  --background: #f3f7fb;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  color: var(--dark);
  background: var(--background);
}

.topbar {
  background: var(--blue);
  color: #eef3f8;
  font-size: 0.92rem;
  letter-spacing: 0.01em;
}

.topbar a {
  color: #eef3f8;
  text-decoration: none;
  opacity: 0.9;
}

.topbar a:hover {
  opacity: 1;
}

.navbar {
  padding: 0.85rem 1rem;
  background: var(--surface);
  border-bottom: 1px solid rgba(15, 45, 69, 0.08);
}

.navbar-brand {
  color: var(--blue) !important;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.nav-link {
  color: var(--dark) !important;
  transition: color 0.2s ease;
}

.nav-link:hover,
.nav-link.active {
  color: var(--teal) !important;
}

.nav-link.text-uppercase {
  text-transform: uppercase;
  font-weight: 600;
}

.dropdown-menu {
  min-width: 220px;
}

.dropdown-item {
  color: var(--dark);
}

.dropdown-item:hover,
.dropdown-item:focus {
  background: rgba(26, 141, 124, 0.06);
}

.hero-section {
  position: relative;
  color: #ffffff;
  min-height: 620px;
  display: flex;
  align-items: center;
  background: transparent;
  overflow: hidden;
}

/* Animated background image layer */
.hero-bg {
  position: absolute;
  inset: 0;
  background-image: url('picture/banner/01 (1).webp');
  background-size: cover;
  background-position: center;
  animation: heroBgSlide 10s ease-in-out infinite;
  z-index: 0;
}

@keyframes heroBgSlide {
  0%, 45%   { background-image: url('picture/banner/01 (1).webp'); }
  50%, 95%  { background-image: url('picture/banner/04.webp'); }
  100%      { background-image: url('picture/banner/01 (1).webp'); }
}

/* Dark gradient overlay for text legibility */
.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(130deg, rgba(10, 35, 60, 0.82) 40%, rgba(10, 60, 75, 0.62) 100%);
  z-index: 1;
}

.hero-inner {
  position: relative;
  z-index: 2;
}

.hero-card,
.announcement-card {
  background: rgba(255,255,255,0.94);
  border: none;
  box-shadow: 0 22px 50px rgba(15, 45, 69, 0.12);
}

.hero-title {
  color: #ffffff;
  font-size: clamp(2.8rem, 3.6vw, 4.8rem);
  font-weight: 800;
  line-height: 1.03;
}

.hero-text {
  color: #dfebf3;
  max-width: 680px;
}

.section-heading {
  color: var(--blue);
  font-weight: 700;
}

.section-subtitle {
  color: var(--muted);
}

.card {
  border: none;
  border-radius: 1.1rem;
  box-shadow: 0 18px 40px rgba(15, 45, 69, 0.08);
}

.card-border {
  border-left: 4px solid var(--teal);
}

.feature-card {
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.feature-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 22px 50px rgba(15, 45, 69, 0.14);
}

.btn-cta {
  background: var(--teal);
  border: none;
  color: #ffffff;
}

.btn-cta:hover {
  background: #176d60;
}

.collaborator-chip {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 160px;
  min-height: 64px;
  margin: 0.5rem;
  padding: 1rem 1.25rem;
  border-radius: 1rem;
  background: var(--surface);
  border: 1px solid rgba(15, 45, 69, 0.1);
  color: var(--dark);
  box-shadow: 0 8px 24px rgba(15, 45, 69, 0.06);
}

.collaborator-track {
  display: flex;
  gap: 1rem;
  overflow-x: auto;
  scroll-behavior: smooth;
  padding-bottom: 1rem;
}

.collaborator-track::-webkit-scrollbar {
  height: 8px;
}

.collaborator-track::-webkit-scrollbar-thumb {
  background: rgba(15, 45, 69, 0.35);
  border-radius: 99px;
}

.section-card {
  border: 1px solid rgba(15, 45, 69, 0.08);
  background: #ffffff;
}

.announcement-card {
  border-radius: 1.2rem;
  padding: 1.5rem;
}

.announcement-card h3 {
  color: var(--blue);
  margin-bottom: 1rem;
}

.announcement-list li {
  margin-bottom: 1rem;
}

.announcement-list a {
  color: var(--blue);
  text-decoration: none;
}

.announcement-list a:hover {
  text-decoration: underline;
}

.announcements-list {
  max-width: 100%;
}

.announcement-item {
  margin-bottom: 1.5rem;
  padding: 1rem;
  background: #ffffff;
  border-left: 4px solid var(--teal);
  box-shadow: 0 4px 12px rgba(15, 45, 69, 0.08);
}

.announcement-item p {
  margin: 0;
  line-height: 1.6;
}

.announcement-item strong {
  color: var(--blue);
}

.announcement-item a {
  color: var(--teal);
  text-decoration: none;
}

.announcement-item a:hover {
  text-decoration: underline;
}

.announcements-list {
  max-width: 100%;
}

.announcement-item {
  margin-bottom: 1.5rem;
  padding: 1rem;
  background: #ffffff;
  border-left: 4px solid var(--teal);
  box-shadow: 0 4px 12px rgba(15, 45, 69, 0.08);
}

.announcement-item p {
  margin: 0;
  line-height: 1.6;
}

.announcement-item strong {
  color: var(--blue);
}

.announcement-item a {
  color: var(--teal);
  text-decoration: none;
}

.announcement-item a:hover {
  text-decoration: underline;
}

  .session-list {
    padding-left: 0;
    list-style: none;
  }

  .session-list li {
    margin-bottom: 0.9rem;
  }

  .session-list a {
    color: var(--dark);
    text-decoration: none;
  }

  .session-list a:hover {
    color: var(--teal);
    text-decoration: underline;
  }

  .list-group-item {
    border-radius: 0.85rem;
    margin-bottom: 0.75rem;
    border: 1px solid rgba(15, 45, 69, 0.08);
  }

  .list-group-item strong {
    display: block;
    color: var(--blue);
  }

  .list-group-item .small {
    color: var(--muted);
  }

  .announcements-list {
    margin-bottom: 0;
  }

  .section-card h3 {
    color: var(--blue);
  }

.footer p {
  margin: 0;
}

@media (max-width: 991px) {
  .hero-section {
    padding: 3rem 0;
  }
}

@media (max-width: 768px) {
  .hero-title {
    font-size: 2.8rem;
  }
  .collaborator-chip {
    min-width: 140px;
  }
}

/* Navbar Logo Styling */
.navbar-brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}



/* Gallery and Image Grid Styles */
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
  margin: 2rem 0;
}

.gallery-item {
  position: relative;
  overflow: hidden;
  border-radius: 1rem;
  background: #ffffff;
  box-shadow: 0 8px 24px rgba(15, 45, 69, 0.12);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  cursor: pointer;
  height: 280px;
}

.gallery-item:hover {
  transform: translateY(-8px);
  box-shadow: 0 16px 40px rgba(15, 45, 69, 0.18);
}

.gallery-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.3s ease;
}

.gallery-item:hover img {
  transform: scale(1.05);
}

.gallery-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: linear-gradient(to top, rgba(15, 45, 69, 0.95), transparent);
  padding: 1.5rem 1rem;
  color: white;
  transform: translateY(100%);
  transition: transform 0.3s ease;
}

.gallery-item:hover .gallery-overlay {
  transform: translateY(0);
}

.gallery-overlay h5 {
  margin: 0;
  font-size: 1rem;
  font-weight: 600;
}

/* Logo Grid for Collaborators */
.logo-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 2rem;
  align-items: center;
  margin: 2rem 0;
}

.logo-card {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  background: #ffffff;
  border: 2px solid rgba(15, 45, 69, 0.08);
  border-radius: 1rem;
  min-height: 180px;
  transition: all 0.3s ease;
  cursor: pointer;
}

.logo-card:hover {
  border-color: var(--teal);
  box-shadow: 0 12px 32px rgba(26, 141, 124, 0.15);
  transform: translateY(-4px);
}

.logo-card img {
  max-width: 85%;
  max-height: 100px;
  object-fit: contain;
  transition: transform 0.3s ease;
}

.logo-card:hover img {
  transform: scale(1.08);
}

/* Team Member Card */
.team-member-card {
  text-align: center;
  border-radius: 1.1rem;
  overflow: hidden;
  box-shadow: 0 8px 24px rgba(15, 45, 69, 0.12);
  transition: all 0.3s ease;
  background: #ffffff;
}

.team-member-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 16px 40px rgba(15, 45, 69, 0.18);
}

.team-member-image {
  width: 100%;
  height: 300px;
  object-fit: cover;
  display: block;
}

.team-member-info {
  padding: 1.5rem;
}

.team-member-name {
  color: var(--blue);
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.team-member-title {
  color: var(--teal);
  font-size: 0.9rem;
  font-weight: 600;
}

/* Project Image Layout */
.project-image-section {
  position: relative;
  border-radius: 1rem;
  overflow: hidden;
  height: 320px;
  background: linear-gradient(135deg, rgba(15, 45, 69, 0.1), rgba(26, 141, 124, 0.1));
  margin-bottom: 1.5rem;
  box-shadow: 0 8px 24px rgba(15, 45, 69, 0.12);
}

.project-image-section img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.4s ease;
}

.project-card:hover .project-image-section img {
  transform: scale(1.05);
}

/* Modal Styles for Image Lightbox */
.lightbox-modal {
  display: none;
  position: fixed;
  z-index: 3000;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.95);
  animation: fadeIn 0.3s ease;
}

.lightbox-modal.show {
  display: flex;
  align-items: center;
  justify-content: center;
}

.lightbox-content {
  position: relative;
  max-width: 95%;
  max-height: 90vh;
  animation: slideUp 0.3s ease;
}

.lightbox-content img {
  max-width: 100%;
  max-height: 90vh;
  object-fit: contain;
}

.lightbox-close {
  position: absolute;
  top: -40px;
  right: 0;
  color: white;
  font-size: 2.5rem;
  cursor: pointer;
  transition: transform 0.2s ease;
}

.lightbox-close:hover {
  transform: rotate(90deg);
}

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

@keyframes slideUp {
  from { transform: translateY(50px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

@media (max-width: 768px) {
  .gallery-grid {
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 1rem;
  }
  
  .logo-grid {
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
  }
  
  .team-member-image {
    height: 250px;
  }
}

/* =============================================
   COLLABORATORS PREMIUM MARQUEE SECTION
   ============================================= */

.collaborators-section {
  background: linear-gradient(135deg, #f0f6ff 0%, #e8f4f1 100%);
  overflow: hidden;
}

.collab-eyebrow {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--teal);
  background: rgba(26, 141, 124, 0.1);
  padding: 0.3rem 1rem;
  border-radius: 99px;
  margin-bottom: 0.5rem;
}

/* Wrapper: hides overflow + adds fade edges */
.collab-marquee-wrap {
  position: relative;
  width: 100%;
  overflow: hidden;
  /* Fade left & right edges */
  -webkit-mask-image: linear-gradient(to right, transparent 0%, black 8%, black 92%, transparent 100%);
  mask-image: linear-gradient(to right, transparent 0%, black 8%, black 92%, transparent 100%);
}

/* Inner scrolling track */
.collab-marquee {
  display: flex;
  gap: 1.5rem;
  width: max-content;
  padding: 0.75rem 0;
}

.collab-marquee--left {
  animation: scrollLeft 28s linear infinite;
}

.collab-marquee--right {
  animation: scrollRight 28s linear infinite;
}

/* Pause on hover */
.collab-marquee-wrap:hover .collab-marquee {
  animation-play-state: paused;
}

@keyframes scrollLeft {
  0%   { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}

@keyframes scrollRight {
  0%   { transform: translateX(-50%); }
  100% { transform: translateX(0); }
}

/* Individual logo card */
.collab-logo-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  min-width: 180px;
  min-height: 120px;
  padding: 1.25rem 1.5rem;
  background: rgba(255, 255, 255, 0.85);
  border: 1px solid rgba(255, 255, 255, 0.9);
  border-radius: 1.25rem;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  box-shadow: 0 4px 20px rgba(15, 45, 69, 0.08);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  cursor: default;
  flex-shrink: 0;
}

.collab-logo-card:hover {
  transform: translateY(-6px) scale(1.03);
  box-shadow: 0 12px 36px rgba(26, 141, 124, 0.18);
}

.collab-logo-card img {
  max-height: 52px;
  max-width: 130px;
  width: auto;
  object-fit: contain;
  filter: grayscale(20%);
  transition: filter 0.3s ease;
}

.collab-logo-card:hover img {
  filter: grayscale(0%);
}

.collab-logo-card span {
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
}