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HTML 

              
                <div class="content">
  <h1>Problème avec orientation des media queries (Css)</h1>
  <form onsubmit="return false">
    <fieldset>
      <legend>Cliquer sur un champ pour faire apparaître le clavier de votre mobile.</legend>
      <div id="info">
       Orientation Css utilisée : <span id="orientation"></span><br>
       Taille zone affichage : <span id="width"></span> x <span id="height"></span><br>
       Taille de l'écran : <span id="widthscreen"></span> x <span id="heightscreen"></span>
      </div>
      <div class="formulaire">  
        <div class="ligne">
          <label for="" class="label_custom">Votre Nom:</label>
          <input type="text" class="input is-rounded" placeholder="Nom" name="nom">
        </div>
        <div class="ligne">
          <label for="" class="label_custom">Votre Prénom:</label>
          <input type="text" class="input is-rounded" placeholder="Prénom" name="prenom">
        </div>
        <div class="ligne">
          <label for="" class="label_custom">Votre Email:</label>
          <input type="email" class="input is-rounded" placeholder="Email" name="mail">
        </div> 
      </div>
      <div class="ligne">
        <input type="button" class="button is-rounded" value="Je m'inscris" placeholder="Nom" name="submit">
      </div>
    </fieldset>
  </form>
  <p>Il est possible que lorsque vous tenez <b>votre mobile</b> en mode portrait, l'apparition de votre clavier pour saisir des données dans un champ de formulaire, fasse passer la charte Css mode paysage (landscape).</p>
   <p>
     <h2>Conclusion</h2>
<p>La zone d'affichage est en mode <code>portrait</code> quand la hauteur de la zone d'affichage est la plus grande que sa largeur <b>et non</b> quand le mobile est tenu en mode portrait.
     <br> 
    La zone d'affichage est en mode <code>paysage</code> quand la largeur de la zone d'affichage est la plus grande que sa hauteur <b>et non</b> quand le mobile est tenu en mode paysage.</p>
</div>  
<hr>
<div class="mise-en-page-lien">  
  <div class="bloc-mise-en-page bloc-lien">
    <h2>Liens utiles CSS</h2>
    <ul>  
      <li><a href="https://media-queries.aliasdmc.fr/#OJJNRzg0000.codepen" target="_blank">meta query</a></li>
      <li><a href="https://media-queries.aliasdmc.fr/meta_viewport_et_viewport_css_mobile.php#OJJNRzg0000.codepen" target="_blank">meta viewport</a></li>
    </ul> 
  </div>
  <div class="bloc-mise-en-page bloc-lien bloc-sites">
    <h2>Sites</h2>
    <ul>
      <li><a href="https://www.zonecss.fr/#OJJNRzg0000.codepen" target="_blank" title="Glossaire CSS">Zone CSS</a></li>
      <li><a href="http://www.aliasdmc.fr/#OJJNRzg0000.codepen" target="_blank" title="Glossaire HTML/JAVASCRIPT">Zone (X)HTML</a></li>
      <li><a href="https://web-color.aliasdmc.fr/#OJJNRzg0000.codepen" target="_blank" title="Couleurs pour le WEb (#,rgb,hsl)">Couleurs Web</a></li>
      <li><a href="https://outils-css.aliasdmc.fr/#OJJNRzg0000.codepen" target="_blank">Outils CSS</a></li>
      <li><a href="https://outils-javascript.aliasdmc.fr/#OJJNRzg0000.codepen" target="_blank">Outils Javascript</a></li>
       <li><a href="https://media-queries.aliasdmc.fr/#OJJNRzg0000.codepen" target="_blank">Media Queries</a></li>
    </ul>
  </div>
</div>
!

CSS 

              
                .ligne{margin-bottom : 5px;}
.content{}
.formulaire{
  display:flex;
}
@media screen and (orientation: landscape) {
  #orientation:before{ content :"landscape"}
  .formulaire{
    /* Les champs sont sur une colonne */
    flex-direction : row;
  }
}
@media screen and (orientation: portrait) {
  #orientation:before{ content :"portrait"}
 .formulaire{
    /* Les champs sont sur une ligne */
    flex-direction : column;
  }
}
!

JS 

              
                /* //////////////////////////////////////////////
Plus d'informations liées à la solution  : 
//////////////////////////////////////////////  */
/*
Toutes le fonctions ci-dessous peuvent être optimisées
elles sont même volontairement non optimisées
Elles sont là juste pour vous présenter le concept à vous de les améliorer 
*/
function getTaille(){
  let oWidth = document.getElementById('width'),
      oHeight =document.getElementById('height'),
      oWidthscreen = document.getElementById('widthscreen'),
      oHeightscreen =document.getElementById('heightscreen');
  oWidthscreen.innerHTML =  screen.width;
  oHeightscreen.innerHTML = screen.height ;
  oHeight.innerHTML = document.documentElement.clientHeight;
  oWidth.innerHTML = document.documentElement.clientWidth;  
}

document.addEventListener('DOMContentLoaded',function(){
  window.addEventListener("resize", getTaille);
});
window.addEventListener('load',function(){
  getTaille();
});
!
999px

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