body {
  font-family: "Arial", sans-serif;
  font-size: 1.2rem;
  line-height: 1.6;
  background-color: #f9f9f9;
  color: #222;
  padding: 0;
  margin: 0;
}

header {
  text-align: center;
  padding: 1.5rem 0;
  background-color: #cce7ff;
  box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

header h1 {
  margin: 0;
  font-size: 2rem;
  color: #0055a5;
}

/* Main Section */
main {
  max-width: 650px;
  margin: 2rem auto;
  padding: 1rem;
}

/* Buttons */
button {
  padding: 0.6rem 1.2rem;
  font-size: 1.2rem;
  margin: 0.5rem;
  border: none;
  border-radius: 10px;
  cursor: pointer;
  background-color: #0055a5;
  color: #fff;
  transition: background-color 0.2s;
}

button:hover {
  background-color: #003f7f;
}

/* FOR STARTPAGE */

.intro {
  text-align: center;
  margin: 2rem 1rem;
  font-size: 1.2rem;
}

.lessons {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1.5rem;
  padding: 1rem;
}

.lesson-card {
  display: block;
  background: white;
  border-radius: 12px;
  padding: 1.5rem;
  text-align: center;
  text-decoration: none;
  color: inherit;
  width: 200px;
  box-shadow: 0 4px 6px rgba(0,0,0,0.1);
  transition: transform 0.2s, box-shadow 0.2s;
}

.lesson-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 12px rgba(0,0,0,0.15);
}

.lesson-card h2 {
  margin: 0 0 0.5rem 0;
  font-size: 1.4rem;
  color: #4a90e2;
}