/* Reset basique */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

/* Général */
body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: linear-gradient(to right, #f2f9f1, #e6f0e9);
  color: #2c3e50;
  line-height: 1.8;
  padding: 30px 15px;
  max-width: 1000px;
  margin: auto;
}

/* Titres */
h1 {
  font-size: 2.5em;
  margin-bottom: 25px;
  text-align: center;
  color: #27ae60;
  font-weight: bold;
  text-shadow: 1px 1px 2px rgba(0,0,0,0.1);
}

h2 {
  font-size: 1.8em;
  margin-bottom: 10px;
  color: #1c5d3a;
  border-left: 5px solid #2ecc71;
  padding-left: 10px;
}

h3 {
  font-size: 1.4em;
  color: #14532d;
  margin-top: 15px;
  margin-bottom: 5px;
}

/* Sections */
.section {
  background-color: #ffffff;
  border: 1px solid #e1e1e1;
  padding: 25px;
  border-radius: 12px;
  box-shadow: 0 4px 10px rgba(0,0,0,0.05);
  margin-bottom: 30px;
  transition: transform 0.3s ease;
}

.section:hover {
  transform: scale(1.01);
}

/* Listes et paragraphes */
ul, ol {
  margin-left: 25px;
  margin-bottom: 15px;
}

li {
  margin-bottom: 8px;
}

p {
  margin-bottom: 15px;
  font-size: 1.05em;
}


   
    .video-container {
      position: relative;
      padding-bottom: 56.25%; /* Ratio 16:9 */
      height: 0;
      overflow: hidden;
      border-radius: 12px;
      box-shadow: 0 5px 20px rgba(0, 0, 0, 0.2);
    }

    .video-container iframe {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      border: none;
    }


/* Liens */
a {
  color: #ffffff;
  font-weight: bold;
  text-decoration: underline;
}

a:hover {
  color: #d5f7dd;
}

/* Footer */
footer {
  background-color: #2ecc71;
  padding: 25px;
  border-radius: 10px;
  text-align: center;
  color: white;
  margin-top: 50px;
  box-shadow: 0 3px 10px rgba(0,0,0,0.1);
}

/* Bouton imprimer */
.btn-print {
  background-color: #27ae60;
  color: white;
  border: none;
  padding: 12px 25px;
  font-size: 16px;
  border-radius: 8px;
  cursor: pointer;
  margin-top: 15px;
  transition: background-color 0.3s ease;
}

.btn-print:hover {
  background-color: #1e8449;
}

/* Quiz */
.section ul.quiz {
  list-style-type: decimal;
  margin-left: 30px;
  background-color: #f4fdf6;
  padding: 15px;
  border-left: 4px solid #27ae60;
  border-radius: 8px;
}

/* Responsive */
@media screen and (max-width: 768px) {
  body {
    padding: 20px 10px;
  }

  h1 {
    font-size: 2em;
  }

  h2 {
    font-size: 1.5em;
  }

  .section {
    padding: 20px;
  }
}





    .sectionr {
      max-width: 300px;
      margin: 5px auto;
      background-color: #ffffff;
      padding: 5px;
      border-radius: 5px;
      box-shadow: 0 4px 5px rgba(0,0,0,0.1);
    }

    .btn-retour {
      display: block;
      margin: 40px auto 0;
      background-color: #3498db;
      color: white;
      padding: 12px 25px;
      border: none;
      border-radius: 8px;
      font-size: 16px;
      cursor: pointer;
      text-decoration: none;
      transition: background-color 0.3s ease;
      text-align: center;
      max-width: 250px;
    }

    .btn-retour:hover {
      background-color: #2c80b4;
    }