/* Global Styles */
body.ui-style-5 {
  font-size: 16px;
}

/* Enhanced Header */
.header {
  box-shadow: 0 2px 4px rgba(0,0,0,0.08);
}

.nav a.active,
.nav a:hover {
  background: #e8f0fe;
  color: #1a73e8;
  text-decoration: none;
}

/* Section Enhancements */
.section {
  animation: fadeIn 0.3s ease-in;
}

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

/* Video Card Hover Effects */
.video-card:hover,
.video-list > div:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

/* Responsive Design */
@media (max-width: 768px) {
  .container {
    padding: 0 10px;
  }

  .section {
    padding: 15px;
    margin-bottom: 15px;
  }

  h1 { font-size: 24px !important; }
  h2 { font-size: 20px !important; }
  h3 { font-size: 16px !important; }

  .video-grid {
    grid-template-columns: 1fr !important;
  }
}

/* Utility Classes */
.text-muted {
  color: #5f6368;
}

.badge {
  display: inline-block;
  padding: 4px 10px;
  background: #e8f0fe;
  color: #1a73e8;
  border-radius: 4px;
  font-size: 12px;
  font-weight: 500;
}

/* Back to Top Button */
#backToTop {
  position: fixed;
  bottom: 30px;
  right: 30px;
  background: #1a73e8;
  color: #fff;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  border: none;
  cursor: pointer;
  display: none;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.2);
  z-index: 1000;
  transition: background 0.3s;
}

#backToTop:hover {
  background: #1557b0;
}

@media (max-width: 768px) {
  #backToTop {
    width: 45px;
    height: 45px;
    bottom: 20px;
    right: 20px;
  }
}