body {
  font-family: "Poppins", sans-serif;
  scroll-behavior: smooth;
}

.navbar-brand {
  font-size: 1.5rem;
  letter-spacing: 1px;
}

.hero {
  background: url("https://images.unsplash.com/photo-1581092795360-fd1d6ec4b9f3") center/cover no-repeat;
  height: 100vh;
  position: relative;
}

.hero::after {
  content: "";
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 100%;
  background-color: rgba(0, 0, 0, 0.6);
}

.hero > div {
  position: relative;
  z-index: 1;
}

.lecture-card img {
  height: 200px;
  object-fit: cover;
}

.lecture-card {
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.lecture-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 20px rgba(0,0,0,0.2);
}

footer {
  font-size: 0.9rem;
}

@media (max-width: 768px) {
  .hero h1 {
    font-size: 2rem;
  }
  .hero p {
    font-size: 1rem;
  }
}