.sidebar,
.post-sed {
    position: relative;
}

.sidebar.is-sticky,
.post-sed.is-sticky {
    position: fixed;
    top: 20px;
    z-index: 100;
    transition: all 0.3s ease;
}

.sidebar.is-bottom,
.post-sed.is-bottom {
    position: absolute;
    bottom: 0;
    top: auto;
}

/* Đảm bảo sidebar không vượt quá chiều cao viewport */
.sidebar.is-sticky,
.post-sed.is-sticky {
    max-height: calc(100vh - 40px);
    overflow-y: auto;
}

/* Custom scrollbar cho sidebar khi sticky */
.sidebar.is-sticky::-webkit-scrollbar,
.post-sed.is-sticky::-webkit-scrollbar {
    width: 6px;
}

.sidebar.is-sticky::-webkit-scrollbar-track,
.post-sed.is-sticky::-webkit-scrollbar-track {
    background: #f1f1f1;
    border-radius: 3px;
}

.sidebar.is-sticky::-webkit-scrollbar-thumb,
.post-sed.is-sticky::-webkit-scrollbar-thumb {
    background: #888;
    border-radius: 3px;
}

.sidebar.is-sticky::-webkit-scrollbar-thumb:hover,
.post-sed.is-sticky::-webkit-scrollbar-thumb:hover {
    background: #555;
}