/* Courses Hero Section */
.courses-hero {
  background: linear-gradient(135deg, #007bff 0%, #0056b3 100%);
  color: white;
  padding: 120px 0 80px;
  text-align: center;
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 700;
  margin-bottom: 1rem;
}

.hero-subtitle {
  font-size: 1.3rem;
  opacity: 0.9;
  max-width: 600px;
  margin: 0 auto;
}

/* Filter Section */
.filter-section {
  padding: 40px 0;
  background: #f8f9fa;
  border-bottom: 1px solid #e9ecef;
}

.filter-buttons {
  display: flex;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.filter-btn {
  background: white;
  border: 2px solid #007bff;
  color: #007bff;
  padding: 0.75rem 1.5rem;
  border-radius: 25px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.3s ease;
}

.filter-btn:hover,
.filter-btn.active {
  background: #007bff;
  color: white;
  transform: translateY(-2px);
  box-shadow: 0 5px 15px rgba(0, 123, 255, 0.3);
}

/* Courses Section */
.courses-section {
  padding: 80px 0;
  background: white;
}

.courses-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 2rem;
}

.course-card {
  background: white;
  border-radius: 20px;
  overflow: hidden;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
  transition: all 0.3s ease;
  opacity: 1;
  transform: scale(1);
}

.course-card:hover {
  transform: translateY(-10px) scale(1.02);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
}

.course-card.hidden {
  opacity: 0;
  transform: scale(0.8);
  pointer-events: none;
}

.course-image-container {
  position: relative;
  overflow: hidden;
}

.course-image {
  width: 100%;
  height: 250px;
  object-fit: cover;
  transition: transform 0.3s ease;
}

.course-card:hover .course-image {
  transform: scale(1.1);
}

.course-overlay {
  position: absolute;
  top: 1rem;
  right: 1rem;
}

.course-level {
  background: rgba(0, 123, 255, 0.9);
  color: white;
  padding: 0.5rem 1rem;
  border-radius: 20px;
  font-size: 0.9rem;
  font-weight: 500;
}

.course-content {
  padding: 2rem;
}

.course-content h3 {
  font-size: 1.5rem;
  margin-bottom: 1rem;
  color: #333;
  line-height: 1.3;
}

.course-content p {
  color: #666;
  margin-bottom: 1.5rem;
  line-height: 1.6;
}

.course-meta {
  display: flex;
  gap: 1.5rem;
  margin-bottom: 1.5rem;
  font-size: 0.9rem;
  color: #888;
}

.course-meta span {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.course-features {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 2rem;
  flex-wrap: wrap;
}

.feature {
  background: #e3f2fd;
  color: #1976d2;
  padding: 0.3rem 0.8rem;
  border-radius: 15px;
  font-size: 0.8rem;
  font-weight: 500;
}

.learn-more-btn {
  width: 100%;
  padding: 1rem;
  font-size: 1rem;
  font-weight: 600;
  border-radius: 10px;
  transition: all 0.3s ease;
}

.learn-more-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(0, 123, 255, 0.3);
}

/* CTA Section */
.cta-section {
  padding: 80px 0;
  background: linear-gradient(135deg, #007bff, #0056b3);
  color: white;
  text-align: center;
}

.cta-content h2 {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

.cta-content p {
  font-size: 1.2rem;
  margin-bottom: 2rem;
  opacity: 0.9;
}

.btn-large {
  padding: 1rem 3rem;
  font-size: 1.2rem;
  background: white;
  color: #007bff;
}

.btn-large:hover {
  background: #f8f9fa;
  transform: translateY(-3px);
  box-shadow: 0 10px 25px rgba(255, 255, 255, 0.3);
}

/* Filter Animation */
@keyframes filterIn {
  from {
    opacity: 0;
    transform: scale(0.8) translateY(20px);
  }
  to {
    opacity: 1;
    transform: scale(1) translateY(0);
  }
}

@keyframes filterOut {
  from {
    opacity: 1;
    transform: scale(1) translateY(0);
  }
  to {
    opacity: 0;
    transform: scale(0.8) translateY(-20px);
  }
}

.course-card.show {
  animation: filterIn 0.5s ease forwards;
}

.course-card.hide {
  animation: filterOut 0.3s ease forwards;
}

/* Responsive Design */
@media screen and (max-width: 768px) {
  .hero-title {
    font-size: 2.5rem;
  }

  .filter-buttons {
    gap: 0.5rem;
  }

  .filter-btn {
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
  }

  .courses-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

  .course-meta {
    flex-direction: column;
    gap: 0.5rem;
  }

  .cta-content h2 {
    font-size: 2rem;
  }
}

@media screen and (max-width: 480px) {
  .hero-title {
    font-size: 2rem;
  }

  .course-content {
    padding: 1.5rem;
  }

  .filter-buttons {
    flex-direction: column;
    align-items: center;
  }

  .filter-btn {
    width: 200px;
    text-align: center;
  }
}

/* Loading Animation */
.loading {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 200px;
}

.spinner {
  width: 40px;
  height: 40px;
  border: 4px solid #f3f3f3;
  border-top: 4px solid #007bff;
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}