/* General body styles */
body {
  font-family: Arial, sans-serif;
  max-width: 900px;
  margin: 50px auto;
  line-height: 1.6;
  background-color: #f5f5f5;
  color: #333;
  padding: 20px;
  border-radius: 10px;
  box-shadow: 0px 0px 15px rgba(0,0,0,0.1);
}

/* Headings */
h1, h2 {
  color: #2c3e50;
  text-align: center;
}

/* Paragraphs */
p {
  margin-bottom: 20px;
  text-align: center;
}

/* Lesson list */
ul {
  list-style-type: none;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 15px;
  margin-top: 30px;
}

/* Each lesson tile */
li {
  background-color: #ffffff;
  padding: 15px;
  border-radius: 8px;
  text-align: center;
  box-shadow: 0px 2px 5px rgba(0,0,0,0.1);
  transition: transform 0.2s;
}

li:hover {
  transform: scale(1.05);
}

/* Links */
a {
  color: #3498db;
  text-decoration: none;
  font-weight: bold;
  display: block;
  font-size: 18px;
}

a:hover {
  text-decoration: underline;
}

/* Launch note */
.launch-note {
  font-size: 18px;
  color: #e67e22;
  font-weight: bold;
}

/* Logo */
.logo {
  display: block;
  margin: 0 auto 20px auto;
  max-width: 200px;
}