/* Dấu trang + thông báo cho trình đọc pdfnew (pdf-reader-sync.js) */
#prs-bookmark {
    position: fixed;
    top: 64px;
    right: 12px;
    z-index: 2147483000;
    display: flex;
    gap: 6px;
    font-family: Arial, sans-serif;
}
#prs-bookmark .prs-btn {
    width: 38px;
    height: 38px;
    border: 0;
    border-radius: 50%;
    background: rgba(62, 62, 60, .75);
    color: #fff;
    font-size: 18px;
    cursor: pointer;
    box-shadow: 0 2px 6px rgba(0, 0, 0, .25);
}
#prs-bookmark .prs-toggle { filter: grayscale(1); opacity: .8; }
#prs-bookmark .prs-toggle.active { filter: none; opacity: 1; background: #d84315; }
#prs-bookmark .prs-panel {
    display: none;
    position: absolute;
    top: 46px;
    right: 0;
    width: 220px;
    max-height: 60vh;
    overflow-y: auto;
    background: #fff;
    color: #3e3e3c;
    border-radius: 8px;
    box-shadow: 0 4px 16px rgba(0, 0, 0, .25);
}
#prs-bookmark.open .prs-panel { display: block; }
#prs-bookmark .prs-panel-title { padding: 10px 12px; font-weight: bold; border-bottom: 1px solid #eee; }
#prs-bookmark ul { list-style: none; margin: 0; padding: 0; }
#prs-bookmark li { display: flex; align-items: center; border-bottom: 1px solid #f3f3f3; }
#prs-bookmark .prs-goto { flex: 1; padding: 9px 12px; cursor: pointer; }
#prs-bookmark .prs-goto:hover { background: #f5f5f5; }
#prs-bookmark .prs-del { border: 0; background: none; font-size: 18px; color: #999; cursor: pointer; padding: 0 12px; }
#prs-bookmark .prs-del:hover { color: #d84315; }
#prs-bookmark .prs-empty { padding: 10px 12px; color: #999; }
#prs-toast {
    position: fixed;
    left: 50%;
    bottom: 24px;
    transform: translateX(-50%);
    z-index: 2147483001;
    padding: 8px 16px;
    border-radius: 6px;
    background: rgba(0, 0, 0, .8);
    color: #fff;
    font: 14px Arial, sans-serif;
    opacity: 0;
    pointer-events: none;
    transition: opacity .2s;
}
#prs-toast.show { opacity: 1; }