:root {
  --bg-A1: linear-gradient(45deg, #a5d6a7, #66bb6a);
  --bg-A2: linear-gradient(45deg, #43a947, #58875a);
  --bg-B1: linear-gradient(45deg, #ffcc80, #ffa726);
  --bg-B2: linear-gradient(45deg, #ea6f6f, #e53935);
  --bg-C1: linear-gradient(45deg, #7e57c2, #5e35b1);
  --bg-C2: linear-gradient(45deg, #000000, #1a1a1a);
}
html {
  box-sizing: border-box;
  width: 100%;
}
ul,
li {
  list-style: none;
  padding: 0;
  margin: 0;
}
body {
  font-family: Arial, sans-serif;
  background-color: #f0f0f0;
  color: #333;
  margin: 0;
  padding: 0;
}
main {
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
}
h1 {
  color: black;
}

h2 {
  color: #333;
  margin: 5px 0;
}
.button-group {
  display: flex;
}
button {
  background-color: #4caf50;
  color: white;
  border: none;
  padding: 8px 17px;
  margin: 7px;
  cursor: pointer;
  border-radius: 5px;
  font-size: 16px;
  width: 150px;
}

button:hover {
  background-color: #45a049;
}

input[type="text"] {
  padding: 10px;
  margin: 10px 0;
  border: 1px solid #ccc;
  border-radius: 5px;
  width: 300px;
  font-size: 16px;
}
textarea {
  padding: 10px;
  margin: 10px 0;
  border: 1px solid #ccc;
  border-radius: 5px;
  width: 300px;
  min-height: 40px;
  font-size: 16px;
}
audio {
  margin: 10px 0;
}

p#resultat,
p#message-next {
  font-size: 18px;
  font-weight: bold;
  margin: 2px auto;
  min-height: 20px;
}

p#numero-exercice {
  font-size: 18px;
  margin: 12px 0 0;
}

footer {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 150px;
}
/* Responsive design for mobile devices */
@media (max-width: 600px) {
  body {
    height: auto;
  }
  h2 {
    font-size: 20px;
  }
  input[type="text"] {
    width: 100%;
  }

  button {
    padding: 15px;
    font-size: 18px;
  }

  audio {
    width: 100%;
    margin: 2px 0;
  }
}