.section {
  animation: fadeIn 0.5s ease-in;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.video-card {
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.video-card:hover {
  transform: translateY(-4px);
}

nav a {
  position: relative;
  overflow: hidden;
}

nav a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--primary-color, #d32f2f);
  transform: translateX(-100%);
  transition: transform 0.3s;
}

nav a:hover::after {
  transform: translateX(0);
}