/* Sidebar: fixed on right edge of viewport */
.kaixinguo_sidebar {
    position: fixed;
    right: 16px;
    top: 50%;
    transform: translateY(-50%);
    z-index: 999;
}

/* Button list */
.kaixinguo_sidebar .sb-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
    align-items: center;
}

/* Each button */
.kaixinguo_sidebar .sb-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 56px;
    height: 56px;
    border-radius: 10px;
    box-shadow: 0 2px 8px 0 rgba(0, 0, 0, 0.1);
    text-decoration: none;
    border: none;
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    flex-shrink: 0;
}

.kaixinguo_sidebar .sb-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px 0 rgba(0, 0, 0, 0.15);
}

/* Icon inside button */
.kaixinguo_sidebar .sb-icon {
    width: 28px;
    height: 28px;
    object-fit: contain;
    display: block;
}

/* Back to top button */
.kaixinguo_sidebar .sb-totop {
    background: #fff;
    padding: 0;
}

.kaixinguo_sidebar .sb-totop svg {
    width: 28px;
    height: 28px;
    display: block;
}

/* Hide on mobile */
@media screen and (max-width: 768px) {
    .kaixinguo_sidebar {
        display: none;
    }
}