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HTML 

              
                <div id="module_accordion">

    <input type="radio" name="module_accordion" id="module_accordion_1" />
    <section class="mod_acc_section">
        
        <label class="mod_acc_header" for="module_accordion_1">
            <label class="mod_acc_header_close" for="module_accordion_close"></label>
            <div class="mod_acc_title"><img src="https://cyrillucas.com/projects/accordion/list.svg" alt="list" />Title 1</div>
            <img src="https://cyrillucas.com/projects/accordion/arrow_right.svg" alt="arrow-right" class="mod_acc_arrow" />
        </label>
        <div class="mod_acc_content">
            
            Start content 1<br />.<br />.<br />.<br />.<br />.<br />End content 1

            <label for="module_accordion_close">
                <img src="https://cyrillucas.com/projects/accordion/close.svg" alt="close" class="close_content" />
            </label>
        </div>
    </section>

    <input type="radio" name="module_accordion" id="module_accordion_2" />
    <section class="mod_acc_section">
        <label class="mod_acc_header" for="module_accordion_2">
            <label class="mod_acc_header_close" for="module_accordion_close"></label>
            <div class="mod_acc_title"><img src="https://cyrillucas.com/projects/accordion/list.svg" alt="list" />Title 2</div>
            <img src="https://cyrillucas.com/projects/accordion/arrow_right.svg" alt="arrow_right" class="mod_acc_arrow" />
        </label>
        <div class="mod_acc_content">
            
            Start content 2<br />.<br />.<br />.<br />.<br />.<br />End content 2

            <label for="module_accordion_close">
                <img src="https://cyrillucas.com/projects/accordion/close.svg" alt="close" class="close_content" />
            </label>
        </div>
    </section>

    <input type="radio" name="module_accordion" id="module_accordion_3" />
    <section class="mod_acc_section">
        <label class="mod_acc_header" for="module_accordion_3">
            <label class="mod_acc_header_close" for="module_accordion_close"></label>
            <div class="mod_acc_title"><img src="https://cyrillucas.com/projects/accordion/list.svg" />Title 3</div>
            <img src="https://cyrillucas.com/projects/accordion/arrow_right.svg" alt="arrow_right" class="mod_acc_arrow" />
        </label>
        <div class="mod_acc_content">
            
            Start content 3<br />.<br />.<br />.<br />.<br />.<br />End content 3
            
            <label for="module_accordion_close">
                <img src="https://cyrillucas.com/projects/accordion/close.svg" alt="close" class="close_content" />
            </label>
        </div>
    </section>

    <input type="radio" name="module_accordion" id="module_accordion_close" />

</div>

<pre>
-----------------
|  PARAMETRAGE  |
-----------------

3 variables en début de CSS :

--open_speed : vitesse de déploiement en pixels / seconde.
--max_content_height : hauteur du contenu le plus grand en pixels (valeur arbitraire possible).
    => ces 2 valeurs sont sans unités, qui sont ajoutées dans la fonction calc().
--opacity_speed : vitesse de l'effet transparent => plein au déploiement en secondes.

On est obligé d'utiliser une hauteur fixe, sinon l'effet de transition ne fonctionne pas.
Cependant, max-height au lieu de height permet l'ajustement au contenu.


----------------
|  POINT FORTS |
----------------

Pure CSS, pas de JavaScript qui va alourdir le code.


--------------
|  DRAWBACK  |
--------------

À cause de la hauteur fixe (max-height), il est difficile d'utiliser un effet de 
transition pour le repliage. En effet, si max-height = 1000px et le contenu = 300px,
le repliage part de 1000px et non 300px, ce qui crée une latence, différente pour 
chaque contenu ayant une hauteur différente.


--------------------
|  FONCTIONNEMENT  |
--------------------

Déploiement :
'''''''''''
On se sert des boutons radio cachés. Une fois cochés par 
l'intermédiaire des en-têtes, ils déplient le contenu associé.

Fermeture :
'''''''''

On coche un bouton radio non-associé à un contenu, qui va décocher les autres. Pour ce faire,
on utilise la fermeture en bas à droite du contenu, ou on clique sur l'en-tête du menu déplié 
pour le refermer (un wrapper apparaît sur l'en-tête du menu déplié, et fait cocher le bouton 
radio non associé au contenu, puis disparait pour pouvoir recocher le bouton radio.)
! garder z-index: 1 sur le wrapper, car en cas d'images dans l'en-tête, elles passent au
dessus du wrapper dans le flux et bloquent le clic.
</pre>
!

CSS 

              
                #module_accordion {
    --open_speed: 300;  /* pixels per second */
    --max_content_height: 2000; /* pixels */
    --opacity_speed: 1s;
    width: 300px;
    margin: auto;
}
    #module_accordion input[type="radio"] {
        display: none;
    }
    #module_accordion input[type="radio"]:checked + .mod_acc_section {
        margin-top: 10px; margin-bottom: 10px;
        box-shadow: 0px 0px 7px grey;
        transition: 0.3s;
    }
        #module_accordion .mod_acc_header {
            position: relative;
            display: flex; justify-content: space-between; align-items: center;
            height: 50px;
            padding-left: 10px; padding-right: 10px;
            background: grey;
            border: 1px solid black;
            cursor: pointer;
        }
            #module_accordion .mod_acc_header_close {
                position: absolute; top:0; left:0;
                z-index: 1;
                display: none;
                height: 100%; width: 100%;
                cursor: pointer;
            }
                #module_accordion input[type="radio"]:checked + .mod_acc_section .mod_acc_header_close {
                    display: block;
                }
            #module_accordion .mod_acc_title img {
                height: 16px; width: 16px;
                padding-right: 10px;
            }
            #module_accordion .mod_acc_title {
                font-size: 20px;
            }
            #module_accordion .mod_acc_arrow {
                height: 12px; width: 12px;
            }   
                #module_accordion input[type="radio"]:checked + .mod_acc_section .mod_acc_arrow {
                    transform: rotateZ(90deg);
                    transition: transform 0.3s;
                }
        #module_accordion .mod_acc_content {
            max-height: 0px;
            overflow: hidden;
            background: lightgrey;
            opacity: 0%;
        }
            #module_accordion input[type="radio"]:checked + .mod_acc_section .mod_acc_content {
                padding: 5px;
                border: 1px solid black; border-top: 0;
                max-height: calc(var(--max_content_height) * 1px);
                opacity: 100%;
                transition: max-height calc(var(--max_content_height) / var(--open_speed) * 1s), opacity var(--opacity_speed);
            }
            #module_accordion .mod_acc_content .close_content {
                float: right;
                width: 14px; height: 14px;
                cursor: pointer;
            }
!

JS
!
999px

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