body {
  background: linear-gradient(135deg, #f4f8ff, #e6f0ff);
  font-family: "Poppins", sans-serif;
}

/* Sidebar */
.sidebar {
  background: #fff;
  border-radius: 16px;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.08);
  padding: 15px 0;
  /* min-height: 100%; */
  height: 100%;
}

.nav-link {
  color: #333;
  font-weight: 500;
  padding: 12px 20px;
  border-radius: 8px;
  margin: 5px 10px;
  transition: all 0.3s ease;
}

.nav-link:hover {
  background: rgba(0, 123, 255, 0.1);
  color: #007bff;
  transform: translateX(5px);
}

.nav-link.active {
  background: linear-gradient(90deg, #007bff, #00c6ff);
  color: #fff !important;
  font-weight: 600;
  box-shadow: 0 4px 12px rgba(0, 123, 255, 0.4);
  transform: scale(1.05);
}

/* Content Card */
.content-card {
  background: #fff;
  border-radius: 20px;
  padding: 40px;
  box-shadow: 0 8px 22px rgba(0, 0, 0, 0.1);
  min-height: 320px;
  opacity: 0;
  transform: scale(0.9);
  animation: fadeInScale 0.6s forwards;
}

.content-card h3 {
  font-weight: 600;
  color: #222;
}

/* Animations */
@keyframes fadeInScale {
  from {
    opacity: 0;
    transform: scale(0.9) translateY(20px);
  }
  to {
    opacity: 1;
    transform: scale(1) translateY(0);
  }
}

/* Video Styling */
.video-frame {
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.2);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.video-frame:hover {
  transform: scale(1.03);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.3);
}