Menu mobile / burger

<style>
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600&display=swap');

.bn-burger {
  --bn-burger-accent: #E6E4DD;

  position: relative;
  min-height: 260px;
  overflow: hidden;

  font-family: 'Inter', sans-serif;
  background: #0B0F10;
}

.bn-burger__checkbox {
  display: none;
}

.bn-burger__bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem 1.5rem;
}

.bn-burger__logo {
  color: #E6E4DD;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.bn-burger__hamburger {
  display: flex;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
}

.bn-burger__hamburger span {
  width: 24px;
  height: 2px;
  background: #E6E4DD;
}

/* Le panneau est caché hors-écran par défaut (translateX 100%),
   et glisse à l'intérieur quand la case à cocher passe à "coché" */
.bn-burger__panel {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  width: 280px;
  max-width: 82%;

  padding: 4rem 2rem 2rem;
  background: #050808;
  border-left: 1px solid rgba(230, 228, 221, 0.1);

  display: flex;
  flex-direction: column;
  gap: 1.25rem;

  transform: translateX(100%);
  transition: transform 0.35s ease;

  --fx-shadow: none;
  box-shadow: var(--fx-shadow);
}

.bn-burger.fx-shadow .bn-burger__panel {
  --fx-shadow: -30px 0 60px -20px rgba(0, 0, 0, 0.6);
}

.bn-burger__checkbox:checked ~ .bn-burger__panel {
  transform: translateX(0);
}

.bn-burger__close {
  position: absolute;
  top: 1.25rem;
  right: 1.5rem;
  color: #E6E4DD;
  cursor: pointer;
  font-size: 1.1rem;
}

.bn-burger__link {
  color: #C7C1B7;
  text-decoration: none;
  font-size: 0.95rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.bn-burger__link.is-active,
.bn-burger__link:hover {
  color: var(--bn-burger-accent);
}

.bn-burger__search input {
  width: 100%;
  margin-top: 0.75rem;
  padding: 0.6rem 0.8rem;

  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(230, 228, 221, 0.15);
  border-radius: 4px;
  color: #E6E4DD;
  font-family: inherit;
}

.bn-burger__social {
  display: flex;
  gap: 1rem;
  margin-top: auto;
}

.bn-burger__social a {
  color: #979793;
  text-decoration: none;
  font-size: 0.75rem;
  letter-spacing: 0.04em;
}

.bn-burger__social a:hover {
  color: var(--bn-burger-accent);
}

</style>

<div class="bn-burger" data-fx-root>
  <!-- La case à cocher est invisible : c'est elle qui retient l'état
       "menu ouvert / fermé", entièrement piloté en CSS -->
  <input type="checkbox" id="bn-burger-toggle" class="bn-burger__checkbox" />

  <header class="bn-burger__bar">
    <span class="bn-burger__logo">BN</span>
    <label class="bn-burger__hamburger" for="bn-burger-toggle" aria-label="Ouvrir le menu">
      <span></span><span></span><span></span>
    </label>
  </header>

  <nav class="bn-burger__panel">
    <label class="bn-burger__close" for="bn-burger-toggle" aria-label="Fermer le menu">✕</label>

    <a href="#" class="bn-burger__link">À propos</a>
    <a href="#" class="bn-burger__link is-active">Projets</a>
    <a href="#" class="bn-burger__link">Réflexions</a>
    <a href="#" class="bn-burger__link">Contact</a>

    <div class="bn-burger__search">
      <input type="search" placeholder="Rechercher" />
    </div>

    <div class="bn-burger__social">
      <a href="#" aria-label="Instagram">IG</a>
      <a href="#" aria-label="X">X</a>
      <a href="#" aria-label="Vimeo">VM</a>
    </div>
  </nav>
</div>