.background {
    position: fixed;
    inset: 0;
    z-index: -1; /* placer derrière tout le contenu */
    pointer-events: none; /* laisser les clics passer */
    height: 100%;
    padding: 0;
    margin: 0;
    background-image: url('../../../assets/backgrounds/background-05.svg');
    background-size: cover;
    background-position: top;
    transition: transform 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Rotation du background en vue sous-hub */
.background.cn-bg-rotated {
    transform: rotate(60deg) scale(3);
}


/* =========================
   VUES HUB / SOUS-HUB
========================= */

.cn-view {
    transition: opacity 0.4s ease, transform 0.4s ease;
    opacity: 1;
    transform: translateY(0);
}

.cn-view-hidden {
    display: none !important;
    opacity: 0;
    transform: translateY(12px);
}


/* =========================
   PATH-SUBNAV : transition de couleur
========================= */

.path-subnav {
    transition: background-color 0.5s ease;
}
#gb1 { 
    --ar-accent: var(--subglobal-color-définitiontechnique);
    --ar-accent-light: var(--subglobal-color-définitiontechnique-light);}
#gb2 { 
    --ar-accent: var(--subglobal-color-divers);
    --ar-accent-light: var(--subglobal-color-divers-light);}
    
.arcn-nav-link {
    display: flex;
    font-size: var(--txt-size-10);
    font-weight: 700;
    color: var(--txt-color-blackop-70);
    text-align: center;
    padding: 20px 0;
    background-color: rgba(245, 222, 179, 0);
    background-image: linear-gradient(170deg, rgba(255, 0, 0, 0), var(--ar-accent-light));
    border: 2px solid var(--global-transparent-white-1);
    border-radius: 20px;
    filter: contrast(1) brightness(1) saturate(1);
    backdrop-filter: blur(10px) brightness(1.05);
    transition: all 1s;
}
.arcn-nav-link:hover {
    border-color: white;
    background-image: linear-gradient(170deg, var(--ar-accent-light), rgba(255, 0, 0, 0));
    background-color: var(--ar-accent-light);
    background-blend-mode:exclusion;
    box-shadow: 0 0 10px rgb(255, 255, 255);
    filter: brightness(1.4) contrast(1);
    transition: filter .8s, background-color .6s, box-shadow .6s;
}
.arcn-button-text {
    width: 100%;
    padding: 6px 0;
    border-top: 1px solid white;
    border-bottom: 1px solid white;
    background-color: var(--global-transparent-white-2);
}