/* =========================================================
   Brand popover (no jQuery / no Bootstrap)
========================================================= */
.site-nav .brand {
    position: relative;
    /* ancrage */
}

.site-nav .brand-popover {
    position: absolute;
    top: calc(100% + 10px);
    left: 50%;

    z-index: 1200;
    width: 220px;
    padding: 10px;
    border-radius: 14px;

    background: rgba(20, 20, 20, 0.92);
    color: rgba(255, 255, 255, 0.9);
    border: 1px solid rgba(255, 255, 255, 0.10);
    box-shadow: 0 18px 50px rgba(0, 0, 0, 0.45);

    opacity: 0;
    pointer-events: none;

    transform: translate(calc(-50% + var(--shift-x, 0px)), -4px);
    transition: opacity 140ms ease, transform 140ms ease;
}

.site-nav .brand-popover.is-open {
    opacity: 1;
    pointer-events: auto;
    transform: translate(calc(-50% + var(--shift-x, 0px)), 0);
}

.site-nav .brand-popover img {
    width: 100%;
    height: auto;
    display: block;
}

.site-nav .brand-popover .brand-popover-caption {
    margin: 8px 0 0;
    font-style: italic;
    font-weight: 600;
    text-align: right;
    font-size: 0.95rem;
}

/* flèche pilotée par JS */
.site-nav .brand-popover::before {
    content: "";
    position: absolute;
    top: -6px;
    left: var(--arrow-x, 50%);
    width: 12px;
    height: 12px;

    background: rgba(20, 20, 20, 0.92);
    border-left: 1px solid rgba(255, 255, 255, 0.10);
    border-top: 1px solid rgba(255, 255, 255, 0.10);

    transform: translateX(-50%) rotate(45deg);
}