/* Keeping the provided header and footer styles */
:root {
  --white: #ffffff;
  --light-blue: #e3f2fd;
  --blue-100: #bbdefb;
  --blue-200: #90caf9;
  --blue-300: #64b5f6;
  --blue-400: #42a5f5;
  --blue-500: #2196f3;
  --black: #212121;
  --grey-100: #f5f5f5;
  --grey-200: #eeeeee;
  --grey-300: #e0e0e0;
  --grey-400: #bdbdbd;
  --grey-500: #9e9e9e;
  --error-red: #ff3333;
  --success-green: #4caf50;
  --warning-orange: #ff9800;
  --accent-teal: #009688;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: "Arial", sans-serif;
  background-color: var(--light-blue);
  color: var(--black);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Header styles from provided code */
.header {
  background-color: var(--white);
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
  padding: 1rem 0;
  position: fixed;
  width: 100%;
  top: 0;
  z-index: 1000;
}

.header-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  color: var(--black);
  font-size: 1.5rem;
  font-weight: bold;
}

.nav {
  display: flex;
  gap: 1.5rem;
}

.nav a {
  color: var(--black);
  text-decoration: none;
  padding: 0.5rem 1rem;
  border-radius: 4px;
  transition: background-color 0.3s, transform 0.2s;
}

.nav a:hover,
.nav a.active {
  background-color: var(--light-blue);
  transform: translateY(-2px);
}

/* Main content styles */
.main-content {
  flex: 1;
  padding: 80px 20px 40px;
  margin: 72px auto 2rem;
  max-width: 1200px;
}

.content-grid {
  display: grid;
  gap: 2rem;
  margin-top: 2rem;
}

/* Hero section */
.hero-section {
  background: var(--white);
  padding: 4rem;
  border-radius: 12px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}

.hero-text {
  max-width: 600px;
}

.hero-text h1 {
  font-size: 3.5rem;
  color: var(--blue-500);
  margin-bottom: 1rem;
  line-height: 1.1;
}

.tagline {
  font-size: 2rem;
  color: var(--grey-500);
  margin-bottom: 1.5rem;
}

.intro-text {
  font-size: 1.125rem;
  margin-bottom: 2rem;
  color: var(--grey-500);
}

.hero-image {
  width: 100%;
  height: 400px;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
}

.hero-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.hero-image:hover img {
  transform: scale(1.05);
}

.cta-button {
  display: inline-block;
  padding: 1rem 2.5rem;
  font-size: 1.125rem;
  background-color: var(--blue-500);
  color: var(--white);
  text-decoration: none;
  border-radius: 12px;
  font-weight: 600;
  transition: all 0.3s ease;
  box-shadow: 0 4px 15px rgba(33, 150, 243, 0.3);
}

.cta-button:hover {
  background-color: var(--blue-400);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(33, 150, 243, 0.4);
}

/* Section styles */
.about-section,
.teacher-section,
.video-section,
.papers-section {
  background: var(--white);
  padding: 3rem;
  border-radius: 12px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

h2 {
  color: var(--blue-500);
  font-size: 2.2rem;
  margin-bottom: 2rem;
  text-align: center;
  position: relative;
  padding-bottom: 1rem;
}

h2::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 3px;
  background-color: var(--blue-300);
  border-radius: 2px;
}

/* Teacher section */
.teacher-content {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 3rem;
  align-items: center;
}

.teacher-image {
  width: 100%;
  height: 300px;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
}

.teacher-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.teacher-info h3 {
  font-size: 1.8rem;
  color: var(--blue-500);
  margin-bottom: 1.5rem;
}

.teacher-info p {
  font-size: 1.125rem;
  line-height: 1.7;
  color: var(--grey-500);
}

/* Video section */
.video-wrapper {
  max-width: 800px;
  margin: 0 auto;
}

.video-container {
  position: relative;
  padding-bottom: 56.25%;
  height: 0;
  overflow: hidden;
  border-radius: 12px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
}

.video-container iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: none;
  border-radius: 12px;
}

/* Papers section */
.papers-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
}

.paper-card {
  background: var(--white);
  padding: 2rem;
  border-radius: 12px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
  text-align: center;
  transition: all 0.3s ease;
}

.paper-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
}

.paper-card h3 {
  color: var(--blue-500);
  font-size: 1.4rem;
  margin-bottom: 1rem;
}

.paper-link {
  display: inline-block;
  padding: 0.8rem 1.5rem;
  background-color: var(--blue-500);
  color: var(--white);
  text-decoration: none;
  border-radius: 8px;
  transition: all 0.3s ease;
  box-shadow: 0 4px 12px rgba(33, 150, 243, 0.3);
}

.paper-link:hover {
  background-color: var(--blue-400);
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(33, 150, 243, 0.4);
}

/* Features section */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

.feature-card {
  background: var(--white);
  padding: 2.5rem;
  border-radius: 12px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
  text-align: center;
  transition: all 0.3s ease;
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
}

.feature-card h3 {
  color: var(--blue-500);
  font-size: 1.6rem;
  margin-bottom: 1.5rem;
}

/* Partners section */
.partners-section {
  text-align: center;
  padding: 2rem;
  background: var(--white);
  border-radius: 12px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.partners-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 3rem;
  align-items: center;
  justify-items: center;
}

.partner-logo {
  max-width: 180px;
  height: auto;
  transition: transform 0.3s ease;
  opacity: 0.9;
}

.partner-logo:hover {
  transform: scale(1.05);
  opacity: 1;
}

/* Footer styles from provided code */
.footer {
  background-color: var(--white);
  padding: 3rem 0 1rem;
  margin-top: auto;
}

.footer-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
}

.footer-section {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.footer-section h3 {
  color: var(--black);
  margin-bottom: 1rem;
}

.footer-section a {
  color: var(--black);
  text-decoration: none;
  transition: color 0.3s;
}

.footer-section a:hover {
  color: var(--blue-400);
}

.social-links {
  display: flex;
  gap: 1rem;
}

.footer-bottom {
  text-align: center;
  margin-top: 2rem;
  padding-top: 1rem;
  border-top: 1px solid var(--grey-200);
}

/* Responsive styles */
@media (max-width: 1024px) {
  .hero-section {
    padding: 3rem;
    grid-template-columns: 1fr;
    text-align: center;
  }

  .hero-text {
    margin: 0 auto;
  }

  .teacher-content {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .teacher-image {
    margin: 0 auto;
    max-width: 300px;
  }
}

@media (max-width: 768px) {
  .header-content {
    flex-direction: column;
    gap: 1rem;
    text-align: center;
  }

  .nav {
    flex-wrap: wrap;
    justify-content: center;
  }

  .hero-text h1 {
    font-size: 2.5rem;
  }

  .tagline {
    font-size: 1.5rem;
  }

  .papers-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 480px) {
  .hero-section,
  .about-section,
  .teacher-section,
  .video-section,
  .papers-section {
    padding: 1.5rem;
  }

  .papers-grid {
    grid-template-columns: 1fr;
  }

  .hero-text h1 {
    font-size: 2rem;
  }

  .tagline {
    font-size: 1.2rem;
  }
}