.course-detail {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 60px 20px;
  background: radial-gradient(circle at top, #001f2f, #000);
}

.course-banner {
  width: 100%;
  height: 400px;
  max-height: 400px;
  background-size: cover;
  background-position: center;
  border-radius: 16px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
  margin-bottom: 40px;
  margin-top: 100px;
}

.course-info {
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(12px);
  padding: 40px;
  border-radius: 16px;
  max-width: 800px;
  width: 100%;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
  text-align: center;
  box-sizing: border-box;
}

.course-title {
  font-size: 32px;
  margin-bottom: 20px;
  color: #90e0ef;
}

.course-price {
  font-size: 20px;
  font-weight: bold;
  margin-bottom: 10px;
  color: #fff;
}

.course-duration {
  font-size: 16px;
  margin-bottom: 20px;
  color: #cce3f6;
}

.course-description {
  font-size: 16px;
  line-height: 1.6;
  margin-bottom: 30px;
  color: #e0f7ff;
}

.course-book-button {
  display: inline-block;
  padding: 14px 28px;
  background-color: #00b4d8;
  color: #fff;
  font-size: 16px;
  font-weight: 600;
  border-radius: 10px;
  text-decoration: none;
  transition: background-color 0.3s;
}

.course-book-button:hover {
  background-color: #0096c7;
}

.course-banner {
  position: relative;
  width: 100%;
  height: 400px;
  background-size: cover;
  background-position: center;
  border-radius: 16px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
  margin: 100px 0 40px;
}

.course-banner-overlay {
  position: absolute;
  bottom: 100px;
  left: 0;
  width: 100%;
  background: rgba(0, 0, 0, 0.5);
  padding: 20px 100px;
  border-radius: 0 0 16px 16px;
  box-sizing: border-box;
  text-align: center;
}

.course-banner-overlay .course-title {
  font-size: 32px;
  color: #fff;
  margin: 0;
}

.course-highlights {
  list-style: none;
  padding: 0;
  margin: 0 0 30px;
  text-align: left;
}

.course-highlights li {
  font-size: 0.95em;
  color: #e0f7ff;
  padding-left: 20px;
  position: relative;
  margin-bottom: 8px;
}

.course-highlights li::before {
  content: "✔";
  position: absolute;
  left: 0;
  color: #00bcd4;
  font-weight: bold;
}