:root {
  --card-bg: #0f172a;
  --accent-color: #60a5fa;
}

.heading-title { 
  font-size: 3rem; 
  font-weight: 700; 
  text-align: center; 
  color: var(--text-color); 
  margin: 3rem; 
} 
.heading-title span {
   color: var(--accent-color); 
}

/* Layout container */
.course-grid {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 3rem;
  padding: 3rem 1rem;
}

/* Course Card */
.course-card {
  position: relative;
  width: 320px;
  height: 460px;
  background: var(--card-bg);
  border: 1px solid #1f2937;
  border-radius: 1rem;
  overflow: hidden;
  transition: all 0.4s ease;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.25);
  cursor: pointer;
}

.course-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 20px 40px rgba(88, 166, 255, 0.25);
}

/* Top Image */
.course-image img {
  width: 100%;
  height: 45%;
  background: #1e293b;
  display: flex;
  justify-content: center;
  align-items: center;
  color: #94a3b8;
  font-weight: 600;
  font-size: 1.2rem;
}

/* Summary */
.course-summary {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 55%;
  background: var(--card-bg);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  text-align: center;
  transition: transform 0.6s cubic-bezier(0.68, -0.55, 0.265, 1.55);
  z-index: 2;
}

.course-summary h3 {
  color: #fff;
  font-size: 1.4rem;
  margin-bottom: 0.5rem;
}

.course-summary p {
  color: #9ca3af;
  font-size: 0.9rem;
}

/* Details */
.course-details {
  position: absolute;
  bottom: -55%;
  left: 0;
  width: 100%;
  height: 55%;
  background: #1f252d;
  color: #fff;
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  justify-content: space-around;
  transition: transform 0.6s cubic-bezier(0.68, -0.55, 0.265, 1.55);
  z-index: 1;
}

.course-details h4 {
  color: var(--accent-color);
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
  border-bottom: 1px solid #374151;
  padding-bottom: 0.25rem;
}

.course-details ul {
  list-style: none;
  padding: 0;
}

.course-details li {
  font-size: 0.9rem;
  color: #9ca3af;
  margin-bottom: 0.4rem;
  display: flex;
  align-items: center;
}

.course-details li::before {
  content: "✓";
  color: #4ade80;
  margin-right: 0.5rem;
  font-weight: bold;
}

.course-details .enroll-btn {
  width: 100%;
  text-align: center;
  padding: 0.6rem 1rem;
  background: #3b82f6;
  color: #fff;
  border-radius: 0.5rem;
  text-decoration: none;
  font-weight: 600;
  transition: background 0.3s ease, transform 0.2s ease;
}

.course-details .enroll-btn:hover {
  background: #2563eb;
  transform: scale(1.03);
}

/* Hover effect */
.course-card:hover .course-summary {
  transform: translateY(-100%);
}
.course-card:hover .course-details {
  transform: translateY(-100%);
}

/* Responsive */
/* ---------- Tablets ( 768px) ---------- */
@media (max-width: 768px) {
  .course-grid {
    flex-direction: column;
    align-items: center;
  }

  .course-card {
    width: 75%;
    height: 480px;
  }
  .heading-title{
    font-size: 2.5rem;
  }
}

/* ---------- Mobile (480px) ---------- */
@media (max-width: 480px) {
  .heading-title{
    font-size: 2rem;
  }
  .course-card {
    width: 85%;
    height: 400px;
  }

  .course-summary h3 {
    font-size: 1.2rem;
  }

  .course-details h4 {
    font-size: 1rem;
  }

  .course-details li {
    font-size: 0.85rem;
  }
}