/* ==========================================================================
   FLDM GLOBAL BACK-TO-TOP BUTTON
   ========================================================================== */

.fldm-back-to-top {
    position: fixed;
    bottom: calc(28px + env(safe-area-inset-bottom, 0px));
    right: calc(28px + env(safe-area-inset-right, 0px));
    width: 52px;
    height: 52px;
    background-color: var(--fldm-wine, #8B2332);
    color: #FFFFFF;
    border: none;
    border-radius: 14px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 16px rgba(139, 35, 50, 0.32);
    opacity: 0;
    visibility: hidden;
    transform: translateY(16px) scale(0.9);
    transition: opacity 0.25s cubic-bezier(0.16, 1, 0.3, 1),
                transform 0.25s cubic-bezier(0.16, 1, 0.3, 1),
                visibility 0.25s,
                background-color 0.15s ease,
                box-shadow 0.15s ease;
    z-index: 90;
    outline: none;
}

.fldm-back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0) scale(1);
}

.fldm-back-to-top:hover {
    background-color: var(--fldm-wine-dark, #5A141E);
    transform: translateY(-3px) scale(1.02);
    box-shadow: 0 6px 20px rgba(90, 20, 30, 0.45);
}

.fldm-back-to-top:active {
    transform: translateY(-1px) scale(0.98);
}

.fldm-back-to-top:focus-visible {
    outline: 3px solid var(--fldm-wine, #8B2332);
    outline-offset: 3px;
    box-shadow: 0 0 0 4px rgba(139, 35, 50, 0.25);
}

.fldm-back-to-top-icon {
    width: 22px;
    height: 22px;
    stroke: #FFFFFF;
    stroke-width: 2.5;
    transition: transform 0.2s ease;
}

.fldm-back-to-top:hover .fldm-back-to-top-icon {
    transform: translateY(-2px);
}

@media (max-width: 768px) {
    .fldm-back-to-top {
        bottom: calc(20px + env(safe-area-inset-bottom, 0px));
        right: calc(20px + env(safe-area-inset-right, 0px));
        width: 48px;
        height: 48px;
        border-radius: 12px;
    }

    .fldm-back-to-top-icon {
        width: 20px;
        height: 20px;
    }
}

@media (max-width: 480px) {
    .fldm-back-to-top {
        bottom: calc(16px + env(safe-area-inset-bottom, 0px));
        right: calc(16px + env(safe-area-inset-right, 0px));
        width: 46px;
        height: 46px;
        border-radius: 12px;
    }
}