.ssb-fixed-button {
    --ssb-button-color: #006b0b;

    position: fixed;
    top: 50%;
    right: 0;
    z-index: 999999;

    display: flex;
    align-items: center;
    justify-content: center;

    padding: 18px 11px;

    color: #fff !important;
    background: var(--ssb-button-color);
    border-radius: 10px 0 0 10px;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.18);
    text-decoration: none;

    transform: translateY(-50%);
    transition:
        transform 0.3s ease,
        filter 0.3s ease,
        box-shadow 0.3s ease;

    box-sizing: border-box;
}

.ssb-fixed-button span {
    display: block;
    color: inherit;
    font-size: 19px;
    font-weight: 700;
    line-height: 1.1;
    letter-spacing: 0.3px;
    white-space: nowrap;

    writing-mode: vertical-rl;
    transform: rotate(180deg);
}

.ssb-fixed-button:hover,
.ssb-fixed-button:focus {
    color: #fff !important;
    filter: brightness(0.92);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.25);
    text-decoration: none;
    outline: none;

    transform: translate(-5px, -50%);
}

.ssb-fixed-button:focus-visible {
    outline: 3px solid rgba(255, 255, 255, 0.9);
    outline-offset: -5px;
}

@media (max-width: 767px) {
    .ssb-fixed-button {
        padding: 14px 8px;
        border-radius: 8px 0 0 8px;
    }

    .ssb-fixed-button span {
        font-size: 14px;
        letter-spacing: 0.15px;
    }

    .ssb-fixed-button:hover,
    .ssb-fixed-button:focus {
        transform: translate(-3px, -50%);
    }
}

@media (max-height: 500px) {
    .ssb-fixed-button {
        padding-top: 10px;
        padding-bottom: 10px;
    }

    .ssb-fixed-button span {
        font-size: 13px;
    }
}

@media (prefers-reduced-motion: reduce) {
    .ssb-fixed-button {
        transition: none;
    }
}