/* === Variables for customization === */
:root {
    --btn-bg: #0b0b0b;
    --btn-color: #ffffff;
    --btn-hover-bg: #2b2d33;
    --btn-hover-color: #f1f1f1;
    --btn-focus-ring: #444857;
    --btn-active-bg: #23272a;
    --btn-active-color: #e6e6e6;
    --btn-disabled-bg: #b3b3b3;
    --btn-disabled-color: #666666;
    --dropdown-bg: #ffffff;
    --dropdown-link-hover-bg: #f5f5f5;
    --text-color: #444444;
}

/* === Global reset === */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 100%;
}

body {
    align-content: center;
    min-height: 75vh; /* for demo */
    font-size: 1rem;
    font-family: "Poppins", sans-serif;
}

/* === Utility styles === */
button {
    outline: none;
    border: none;
    font-size: inherit;
    font-family: inherit;
}

ul {
    list-style: none;
}

.container {
    display: flex;
    justify-content: center;
    align-items: center;
}

/* === Dropdown styles === */
.dropdown {
    display: inline-block;
    position: relative;
}

/* === Dropdown button styles === */
.dropdown-toggle {
    -webkit-transition: background-color 0.3s, color 0.3s;
    transition: background-color 0.3s, color 0.3s;
    will-change: background-color, color;
    cursor: pointer;
    margin: .25rem;
    border-radius: .25rem;
    background-color: var(--btn-bg);
    padding: 0.5rem 1rem;
    color: var(--btn-color);
    font-weight: 600;
    display: flex;
    align-items: center; /* Gère l'alignement de l'icon */
}

/* === Dropdown icon styles === */
.dropdown-toggle::after {
    display: inline-block;
    margin-left: .5rem;
    content: "\F282";
    color: inherit;
    font-size: .875rem;  
    font-family: bootstrap-icons;
}

/* === Hover state === */
.dropdown-toggle:hover {
    background-color: var(--btn-hover-bg);
    color: var(--btn-hover-color);
}

/* === Focus-visible state === */
.dropdown-toggle:focus-visible {
    outline: 3px solid var(--btn-focus-ring);
    outline-offset: 2px;
}

/* === Active state === */
.dropdown-toggle:active {
    background-color: var(--btn-active-bg);
    color: var(--btn-active-color);
}

/* === Disabled state === */
.dropdown-toggle:disabled {
    opacity: 0.7;
    cursor: not-allowed;
    background-color: var(--btn-disabled-bg);
    color: var(--btn-disabled-color);
}

/* === Dropdown menu styles === */
.dropdown-menu {
    -webkit-transform: translateY(-10px);
    -webkit-transition: opacity 0.3s ease, -webkit-transform 0.3s ease, visibility 0.3s;
    position: absolute;
    top: calc(100% + .25rem);
    left: .25rem;
    transform: translateY(-10px);
    visibility: hidden;
    opacity: 0;
    z-index: 1000;
    transition: opacity 0.3s ease, transform 0.3s ease, visibility 0.3s;
    will-change: opacity, transform, visibility;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    border-radius: .25rem;
    background-color: var(--dropdown-bg);
    padding: .5rem 0;
    min-width: 150px;
    max-width: 175px;
    line-height: 1.6;
}

/* === Dropdown open state === */
.dropdown.open .dropdown-menu {
    -webkit-transform: translateY(0);
    transform: translateY(0);
    visibility: visible;
    opacity: 1;
}

/* === Menu links styles === */
.dropdown-menu a {
    -webkit-transition: background-color .15s;
    display: block;
    transition: background-color .15s;
    will-change: background-color;
    padding: .5rem 1.25rem;
    color: var(--text-color);
    font-weight: 500;
    font-size: .875rem;
    text-decoration: none;
}

.dropdown-menu a:hover {
    background-color: var(--dropdown-link-hover-bg);
}

/* === Animation for dropdown links === */
.dropdown.open .dropdown-menu li {
    -webkit-transform: translateY(10px);
    -webkit-animation: fadeIn 0.3s ease forwards;
    transform: translateY(10px);
    opacity: 0;
    animation: fadeIn 0.3s ease forwards;
}

@keyframes fadeIn {
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

@-webkit-keyframes fadeIn {
  to {
    -webkit-transform: translateY(0);
    opacity: 1;
  }
}

document.addEventListener("DOMContentLoaded", () => {
  const dropdowns = document.querySelectorAll(".dropdown");
  document.addEventListener("click", (event) => {
    let clickedDropdown = null;
    dropdowns.forEach((dropdown) => {
      const toggle = dropdown.querySelector(".dropdown-toggle");
      if (!dropdown.contains(event.target)) {
        toggle.setAttribute("aria-expanded", false);
        dropdown.classList.remove("open");
      } else if (event.target === toggle) {
        clickedDropdown = dropdown;
      }
    });
    if (clickedDropdown) {
      const toggle = clickedDropdown.querySelector(".dropdown-toggle");
      const menu = clickedDropdown.querySelector(".dropdown-menu");
      const isExpanded = toggle.getAttribute("aria-expanded") === "true";
      toggle.setAttribute("aria-expanded", !isExpanded);
      clickedDropdown.classList.toggle("open", !isExpanded);
      if (!isExpanded) {
        menu.querySelectorAll("li").forEach((item, index) => {
          item.style.animationDelay = `${index * 0.1}s`; 
        });
      }
    }
  });
});

// EN:
// Select all elements with the class "dropdown" once the DOM is fully loaded.
// Add a global click event listener to the document.
// Variable to track the currently clicked dropdown.
// Iterate through all dropdown elements to handle open/close logic.
// If the click happened outside the current dropdown, close it.
// Update ARIA attribute to indicate it's collapsed.
// Remove the "open" class to close the dropdown.
// If the toggle button of the current dropdown was clicked, mark it as the active dropdown.
// If a dropdown toggle was clicked, toggle its open state.
// Toggle the ARIA attribute and the "open" class.
// Apply dynamic animation delay to each child element in the dropdown menu.
// Delay increases with the index for cascading effect.

// FR:
// Sélectionne tous les éléments avec la classe "dropdown" une fois que le DOM est entièrement chargé.
// Ajoute un écouteur d'événements global pour les clics sur le document.
// Variable pour suivre le dropdown actuellement cliqué.
// Parcourt tous les éléments dropdown pour gérer la logique d'ouverture/fermeture.
// Si le clic s'est produit en dehors du dropdown actuel, le fermer.
// Met à jour l'attribut ARIA pour indiquer qu'il est replié.
// Retire la classe "open" pour fermer le dropdown.
// Si le bouton toggle du dropdown actuel a été cliqué, le marquer comme dropdown actif.
// Si un bouton toggle de dropdown a été cliqué, basculer son état d'ouverture.
// Basculer l'attribut ARIA et la classe "open".
// Appliquer un délai d'animation dynamique à chaque élément enfant dans le menu déroulant.
// Le délai augmente avec l'index pour un effet en cascade.