body {
  margin: 0;
  font-family: 'Inter', sans-serif;
  background-color: #f4f4f4;
  color: #333;
  scroll-behavior: smooth;
  opacity: 0;
  animation: pageLoad 0.5s ease-in forwards;
}

@keyframes pageLoad {
  to { opacity: 1; }
}

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

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

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

/* Apply animations */
.section {
  animation: fadeInUp 0.8s ease-out;
}

.hero {
  animation: fadeIn 1s ease-out;
}

.video-text {
  animation: slideInLeft 1s ease-out;
}

nav {
  display: flex;
  justify-content: center;
  background-color: white;
  padding: 10px 0;
  position: sticky;
  top: 0;
  z-index: 999;
}

.section {
  padding: 40px 20px;
  max-width: 1000px;
  margin: auto;
  animation: fadeInUp 0.8s ease-out;
}

.section h2 {
  color: #0b132b;
  font-size: 2em;
  margin-bottom: 20px;
}

.section ul {
  list-style: none;
  padding: 0;
}

.section ul li {
  padding: 12px 0;
  padding-left: 30px;
  position: relative;
  line-height: 1.6;
  transition: transform 0.3s ease;
}

.section ul li:hover {
  transform: translateX(5px);
}

.section ul li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: #a3d2ca;
  font-weight: bold;
  font-size: 1.2em;
}

.highlight {
  color: #0b132b;
  font-weight: bold;
}
.cta {
  text-align: center;
  margin-top: 40px;
}
.cta a {
  padding: 12px 25px;
  background-color: #0b132b;
  color: white;
  text-decoration: none;
  border-radius: 6px;
  font-weight: bold;
  transition: all 0.3s ease;
  display: inline-block;
}

.cta a:hover {
  background-color: #1c2541;
  transform: translateY(-2px);
  box-shadow: 0 4px 8px rgba(0,0,0,0.2);
}

footer {
  background-color: #1c2541;
  color: white;
  text-align: center;
  padding: 20px;
  font-size: 0.9em;
}

  .hero {
    background: linear-gradient(to right, #0b132b, #1c2541);
    color: white;
    text-align: center;
    padding: 20px 20px;
  }
  .hero h1 {
    font-size: 2.8em;
    margin-bottom: 10px;
  }
  .hero p {
    font-size: 1.2em;
    margin-bottom: 25px;
  }
  .hero-cta {
    background: #a3d2ca;
    color: #0b132b;
    padding: 12px 30px;
    font-weight: bold;
    text-decoration: none;
    border-radius: 8px;
    transition: all 0.3s ease;
    display: inline-block;
  }
  .hero-cta:hover {
    background: #ffffff;
    color: #0b132b;
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(6, 182, 212, 0.5);
  }

  /* video format */
  .hero-video {
    position: relative;
    height: 100vh;
    overflow: hidden;
    background: #0b132b;
  }
  
  .bg-video {
    position: absolute;
    top: 0;
    left: 0;
    min-width: 100%;
    min-height: 100%;
    object-fit: cover;
    z-index: 1;
    opacity: 0;
    transition: opacity 1s ease-in;
  }

  .bg-video.loaded {
    opacity: 1;
  }
  
  .video-overlay {
    position: relative;
    z-index: 2;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: flex-start;
    padding: 0 10%;
    color: white;
    text-align: left;
    background: rgba(0, 0, 0, 0.35);
  }
  
  .video-text h1 {
    font-size: 3em;
    line-height: 1.2;
    margin: 0;
  }
  
  .video-text p {
    font-size: 1.2em;
    margin-top: 1em;
    max-width: 500px;
  }
  
  .video-text a {
    display: inline-block;
    margin-top: 1.5em;
    padding: 12px 24px;
    background-color: #a3d2ca;
    color: #0b132b;
    text-decoration: none;
    font-weight: bold;
    border-radius: 8px;
    transition: all 0.3s ease;
  }

  .video-text a:hover {
    background-color: #ffffff;
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(6, 182, 212, 0.5);
  }

  
  /* header */
  .main-header {
  background: white;
  border-bottom: 1px solid #ddd;
  position: sticky;
  top: 0;
  z-index: 999;
  padding: 10px 30px;
}

.main-header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 1200px;
  margin: auto;
}

.logo {
  font-size: 1.8em;
  font-weight: 700;
  color: #0b132b;
}

.desktop-nav a {
  margin-left: 30px;
  text-decoration: none;
  color: #0b132b;
  font-weight: 500;
  transition: all 0.3s ease;
  position: relative;
}

.desktop-nav a::after {
  content: '';
  position: absolute;
  width: 0;
  height: 2px;
  bottom: -5px;
  left: 0;
  background-color: #a3d2ca;
  transition: width 0.3s ease;
}

.desktop-nav a:hover::after {
  width: 100%;
}

.desktop-nav a:hover {
  color: #a3d2ca;
}

.desktop-nav a.active {
  color: #a3d2ca;
}

.desktop-nav a.active::after {
  width: 100%;
}

/* Mobile menu toggle button */
.mobile-menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: space-around;
  width: 30px;
  height: 25px;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 0;
  z-index: 1001;
}

.mobile-menu-toggle span {
  width: 30px;
  height: 3px;
  background: #0b132b;
  border-radius: 3px;
  transition: all 0.3s ease;
  transform-origin: center;
}

.mobile-menu-toggle.active span:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}

.mobile-menu-toggle.active span:nth-child(2) {
  opacity: 0;
}

.mobile-menu-toggle.active span:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}

/* Mobile responsiveness */
@media (max-width: 768px) {
  .mobile-menu-toggle {
    display: flex;
  }

  .desktop-nav {
    position: fixed;
    top: 0;
    right: -100%;
    height: 100vh;
    width: 70%;
    max-width: 300px;
    background: white;
    flex-direction: column;
    align-items: flex-start;
    padding: 80px 30px 30px;
    box-shadow: -2px 0 10px rgba(0,0,0,0.1);
    transition: right 0.3s ease;
    z-index: 1000;
  }

  .desktop-nav.active {
    right: 0;
  }

  .desktop-nav a {
    margin: 0 0 20px 0;
    font-size: 1.2em;
    width: 100%;
    padding: 10px 0;
  }

  .desktop-nav a.active {
    border-bottom: none;
    border-left: 3px solid #a3d2ca;
    padding-left: 10px;
  }

  .hero h1 {
    font-size: 2em;
  }

  .hero p {
    font-size: 1em;
  }

  .video-text h1 {
    font-size: 2em;
  }

  .video-text p {
    font-size: 1em;
  }

  .contact-container {
    flex-direction: column;
  }

  .form-row {
    flex-direction: column;
  }

  .radio-group {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .logo {
    font-size: 1.4em;
  }

  .video-text h1 {
    font-size: 1.5em;
  }

  .main-header {
    padding: 10px 15px;
  }

  .section {
    padding: 30px 15px;
  }
}

/* contact form */
.contact-container {
  display: flex;
  flex-wrap: wrap;
  max-width: 1200px;
  margin: 60px auto;
  background: white;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 5px 15px rgba(0,0,0,0.1);
  animation: fadeInUp 0.8s ease-out;
}

.contact-left {
  flex: 1 1 35%;
  background: #0b132b;
  color: white;
  padding: 40px;
}

.contact-left h2 {
  font-size: 1.8em;
  margin-bottom: 20px;
}

.contact-left p,
.contact-left a {
  color: #fff;
  line-height: 1.6;
  font-size: 1em;
}

.contact-right {
  flex: 1 1 65%;
  padding: 40px;
}

.form-row {
  display: flex;
  gap: 20px;
}

.form-group {
  flex: 1;
  display: flex;
  flex-direction: column;
  margin-bottom: 20px;
}

label {
  font-weight: 600;
  margin-bottom: 6px;
  color: #333;
}

input,
textarea {
  padding: 10px;
  font-size: 1em;
  border: 1px solid #ccc;
  border-radius: 6px;
  transition: all 0.3s ease;
}

input:focus,
textarea:focus {
  outline: none;
  border-color: #a3d2ca;
  box-shadow: 0 0 0 3px rgba(6, 182, 212, 0.2);
}

textarea {
  min-height: 100px;
}

.radio-group {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px 20px;
  margin-top: 10px;
}

.submit-btn {
  background-color: #a3d2ca;
  color: #0b132b;
  padding: 12px 24px;
  font-weight: bold;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  font-size: 1em;
  transition: all 0.3s ease;
}

.submit-btn:hover {
  background-color: #0b132b;
  color: white;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(11, 19, 43, 0.3);
}

.submit-btn:active {
  transform: translateY(0);
}

/* Publications page styling */
.publications-list {
  display: flex;
  flex-direction: column;
  gap: 30px;
}

.publication-item {
  display: flex;
  gap: 30px;
  background: white;
  padding: 30px;
  border-radius: 12px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
  transition: all 0.3s ease;
  align-items: flex-start;
}

.publication-item:hover {
  transform: translateY(-3px);
  box-shadow: 0 6px 20px rgba(0,0,0,0.15);
}

.publication-image {
  flex-shrink: 0;
  width: 300px;
  height: auto;
}

.publication-image img {
  width: 100%;
  height: auto;
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.publication-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.publication-content h3 {
  font-size: 1.3em;
  color: #0b132b;
  margin: 0;
  line-height: 1.4;
  font-weight: 600;
}

.publication-title {
  font-size: 1.15em;
  font-style: italic;
  color: #333;
  margin: 0;
  line-height: 1.5;
}

.publication-venue {
  color: #555;
  margin: 0;
  font-size: 1em;
  line-height: 1.5;
}

.publication-doi {
  margin: 5px 0 0 0;
  font-size: 0.95em;
}

.publication-doi a {
  color: #0b132b;
  text-decoration: none;
  border-bottom: 2px solid #a3d2ca;
  transition: all 0.3s ease;
}

.publication-doi a:hover {
  color: #a3d2ca;
  border-bottom-color: #0b132b;
}

/* Responsive design for publications */
@media (max-width: 768px) {
  .publication-item {
    flex-direction: column;
    gap: 20px;
  }

  .publication-image {
    width: 100%;
  }
}

/* Use case page styling */
#usecase h3 {
  color: #0b132b;
  margin-top: 30px;
  margin-bottom: 15px;
}

#usecase .intro-text {
  font-size: 1.1em;
  line-height: 1.8;
  margin-bottom: 40px;
  color: #555;
}

/* Use case grid layout */
.use-case-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 25px;
  margin: 40px 0;
}

.use-case-card {
  background: white;
  padding: 25px;
  border-radius: 12px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.08);
  transition: all 0.3s ease;
  border-left: 4px solid transparent;
}

.use-case-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 20px rgba(0,0,0,0.15);
  border-left-color: #a3d2ca;
}

.use-case-card.featured {
  background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
  border-left-color: #a3d2ca;
  border-left-width: 5px;
}

.use-case-card.featured:hover {
  background: linear-gradient(135deg, #e9ecef 0%, #dee2e6 100%);
}

.card-icon {
  font-size: 2.5em;
  margin-bottom: 15px;
  line-height: 1;
}

.use-case-card h3 {
  color: #0b132b;
  font-size: 1.3em;
  margin: 15px 0 10px 0;
  font-weight: 600;
}

.use-case-card p {
  color: #555;
  line-height: 1.6;
  margin: 0;
  font-size: 0.95em;
}

.use-case-card strong {
  color: #0b132b;
}

/* CTA section at bottom */
.cta-section {
  text-align: center;
  margin-top: 60px;
  padding: 40px 20px;
  background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
  border-radius: 12px;
}

.cta-section h3 {
  font-size: 2em;
  color: #0b132b;
  margin-bottom: 15px;
}

.cta-section p {
  font-size: 1.2em;
  color: #555;
  margin-bottom: 25px;
}

.cta-button {
  display: inline-block;
  padding: 15px 40px;
  background-color: #a3d2ca;
  color: #0b132b;
  text-decoration: none;
  font-weight: bold;
  border-radius: 8px;
  font-size: 1.1em;
  transition: all 0.3s ease;
}

.cta-button:hover {
  background-color: #0b132b;
  color: white;
  transform: translateY(-3px);
  box-shadow: 0 6px 20px rgba(11, 19, 43, 0.3);
}

/* Responsive adjustments for use cases */
@media (max-width: 768px) {
  .use-case-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .cta-section h3 {
    font-size: 1.5em;
  }

  .cta-section p {
    font-size: 1em;
  }
}

/* Smooth scroll for anchor links */
html {
  scroll-behavior: smooth;
}

/* Add subtle page transition */
body {
  opacity: 0;
  animation: pageLoad 0.5s ease-in forwards;
}

@keyframes pageLoad {
  to {
    opacity: 1;
  }
}

/* Enhanced logo animation on hover */
.logo {
  transition: all 0.3s ease;
  cursor: pointer;
}

.logo:hover {
  color: #a3d2ca;
  transform: scale(1.05);
}


/* Solution section base */
.solution {
  padding: 5rem 1.5rem 6rem;
  background: #050816; /* dark, tweak to match your theme */
  color: #f9fafb;
}

.solution__inner {
  max-width: 1080px;
  margin: 0 auto;
}

/* Hero */
.solution__hero {
  text-align: left;
  margin-bottom: 3rem;
}

.solution__hero h1 {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

.solution__tagline {
  font-size: 1.05rem;
  line-height: 1.6;
  max-width: 48rem;
}

/* Grids & cards */
.solution__grid {
  display: grid;
  gap: 1.75rem;
  margin: 2rem 0 3rem;
}

.solution__grid--two {
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.solution__grid--three {
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.solution__card {
  background: rgba(15, 23, 42, 0.9);
  border-radius: 1rem;
  padding: 1.5rem 1.6rem;
  border: 1px solid rgba(148, 163, 184, 0.25);
  box-shadow: 0 18px 40px rgba(15, 23, 42, 0.45);
  backdrop-filter: blur(10px);
}

.solution__card h2,
.solution__card h3 {
  margin-top: 0;
  margin-bottom: 0.75rem;
  font-size: 1.15rem;
}

.solution__card p,
.solution__card ul {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.6;
}

.solution__card ul {
  padding-left: 1.1rem;
}

.solution__card--problem {
  border-left: 3px solid #f97316;
}

.solution__card--solution {
  border-left: 3px solid #22c55e;
}

/* How it works */
.solution__how {
  margin-top: 3rem;
}

.solution__how h2,
.solution__advantages h2,
.solution__who h2 {
  font-size: 1.7rem;
  margin-bottom: 0.75rem;
}

.solution__subtitle {
  font-size: 0.98rem;
  color: #cbd5f5;
  margin-bottom: 1.75rem;
}

.solution__steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 1.75rem;
}

.solution__step {
  position: relative;
  padding-left: 3rem;
}

.solution__step-number {
  position: absolute;
  left: 0;
  top: 0.1rem;
  width: 2.2rem;
  height: 2.2rem;
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: radial-gradient(circle at 30% 30%, #38bdf8, #4f46e5);
  color: #f9fafb;
  font-weight: 600;
  font-size: 0.95rem;
}

/* Advantages / Who */
.solution__advantages {
  margin-top: 4rem;
}

.solution__who {
  margin-top: 3.5rem;
}

/* CTA */
.solution__cta {
  margin-top: 4rem;
  text-align: left;
  max-width: 36rem;
}

.solution__cta h2 {
  font-size: 1.6rem;
  margin-bottom: 0.75rem;
}

.solution__cta p {
  font-size: 0.98rem;
  margin-bottom: 1.5rem;
}

.solution__btn {
  display: inline-block;
  padding: 0.8rem 1.6rem;
  border-radius: 999px;
  font-size: 0.95rem;
  text-decoration: none;
  background: linear-gradient(135deg, #38bdf8, #4f46e5);
  color: #f9fafb;
  font-weight: 600;
  border: none;
  transition: transform 0.1s ease, box-shadow 0.1s ease, opacity 0.1s ease;
  box-shadow: 0 12px 30px rgba(79, 70, 229, 0.5);
}

.solution__btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 18px 40px rgba(79, 70, 229, 0.7);
  opacity: 0.95;
}

/* Responsive tweaks */
@media (max-width: 640px) {
  .solution {
    padding: 3.5rem 1.25rem 4.5rem;
  }

  .solution__hero h1 {
    font-size: 2.1rem;
  }

  .solution__tagline {
    font-size: 0.98rem;
  }
}