body {
  font-family: Arial, sans-serif;
  background: #57473cf7;
  margin: 0;
  padding: 20px;
}

.container {
  max-width: 800px;
  margin: auto;
  background: rgb(106, 155, 111);
  padding: 30px;
  border-radius: 8px;
}

h1 {
  text-align: center;
}

input {
  padding: 10px;
  margin-right: 10px;
  border: 1px solid #160e0e;
  border-radius: 4px;
}

button {
  padding: 10px 15px;
  background: #208b7e;
  color: white;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  transition: background 0.3s;
}

button:hover {
  background: #600138;
}

.course-card, .lesson {
  border: 1px solid #ddd;
  padding: 15px;
  margin: 10px 0;
  border-radius: 6px;
  cursor: pointer;
  transition: background 0.3s;
}

.course-card:hover {
  background: #e0f7fa;
}

.hidden {
  display: none;
}