/* =========================
   🔝 BOTÓN SCROLL ARRIBA
   ========================= */

.scroll-top {
    position: fixed;
    bottom: 80px;
    right: 20px;
    width: 42px;
    height: 42px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--accent);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    z-index: 1050;
    box-shadow: var(--shadow-sm);
    transition:
        opacity .3s ease,
        transform .25s ease,
        box-shadow .25s ease,
        filter .25s ease;
}

/* Visible */
.scroll-top.visible {
    opacity: 1;
    visibility: visible;
}

/* Hover */
.scroll-top:hover {
    filter: brightness(1.08);
    transform: translateY(-3px);
    box-shadow: 0 10px 22px rgba(0,0,0,.18);
}

/* Click */
.scroll-top:active {
    transform: translateY(0) scale(.95);
}

/* Icono */
.scroll-top i {
    color: #fff;
    font-size: 18px;
    transition: transform .25s ease;
}

/* Animación del icono */
.scroll-top:hover i {
    transform: translateY(-2px);
}