/* =========================================================
   BOTÓN VOLVER — flotante circular (solo la flecha)
   Estilo similar al botón de WhatsApp, abajo a la izquierda.
========================================================= */
.b2-volver-wrap {
    position: fixed;
    left: 24px;
    bottom: 28px;
    z-index: 999;
    margin: 0;
    padding: 0;
}

.b2-volver {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 52px;
    height: 52px;
    padding: 0;
    font-size: 0;                 /* oculta el texto, deja solo la flecha */
    color: #ffffff;
    text-decoration: none;
    border-radius: 50%;
    background: linear-gradient(135deg, #8660EA 0%, #6a2de2 100%);
    box-shadow: 0 6px 18px rgba(106, 45, 226, 0.40);
    transition: transform .15s ease, box-shadow .2s ease, filter .2s ease;
}

.b2-volver:hover {
    filter: brightness(1.05);
    transform: translateY(-2px);
    box-shadow: 0 10px 26px rgba(106, 45, 226, 0.52);
}

/* Flecha dibujada con bordes (sin emojis ni glifos) */
.b2-volver::before {
    content: "";
    width: 11px;
    height: 11px;
    border-left: 2.5px solid #ffffff;
    border-bottom: 2.5px solid #ffffff;
    transform: rotate(45deg);
    margin-left: 3px;
    display: inline-block;
}

/* En móvil: un poco más pequeño y pegado a la esquina */
@media (max-width: 767px) {
    .b2-volver-wrap {
        left: 14px;
        bottom: 16px;
    }

    .b2-volver {
        width: 46px;
        height: 46px;
    }
}