/* Khung floating cố định BÊN PHẢI */
.nhauyen-toc-floating {
    position: fixed;
    top: 100px;
    right: 20px;          /* ➡ chuyển sang phải */
    z-index: 9999;
    font-family: "Segoe UI", Roboto, Arial, sans-serif;
    transition: opacity 0.4s ease;
}

/* Nút toggle gọn, tròn hơn */
.toc-toggle {
    background: linear-gradient(135deg,#0073aa,#0096d6);
    color: #fff;
    border: none;
    padding: 10px 14px;
    border-radius: 30px;          /* nút tròn */
    cursor: pointer;
    font-size: 14px;
    font-weight: 600;
    box-shadow: 0 3px 6px rgba(0,0,0,0.25);
    transition: all 0.3s ease;
}
.toc-toggle:hover {
    background: linear-gradient(135deg,#0096d6,#00b4ff);
    transform: translateY(-2px);
    box-shadow: 0 5px 10px rgba(0,0,0,0.3);
}

/* Hộp TOC */
.nhauyen-toc {
    border: 1px solid #ddd;
    background: #ffffff;
    padding: 15px;
    margin-top: 12px;
    border-radius: 10px;
    width: 260px;
    max-height: 70vh;
    overflow-y: auto;
    display: none; /* Ẩn mặc định */
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

.nhauyen-toc .toc-title {
    font-weight: 700;
    font-size: 17px;
    margin-bottom: 10px;
    color: #222;
    text-align: center;
}

.nhauyen-toc .toc-list {
    list-style: none;
    margin: 0;
    padding: 0;
}

.nhauyen-toc .toc-list li {
    margin: 5px 0;
    line-height: 1.4;
}

.nhauyen-toc .toc-list li a {
    text-decoration: none;
    color: #0073aa;
    transition: color 0.3s, padding-left 0.3s;
    display: inline-block;
}
.nhauyen-toc .toc-list li a:hover {
    color: #d54e21;
    padding-left: 4px;
}

.nhauyen-toc .toc-level-3 {
    margin-left: 18px;
    font-size: 14px;
}

/* Hiện/ẩn khi cuộn */
.nhauyen-toc-floating.hidden {
    opacity: 0;
    pointer-events: none;
}
.nhauyen-toc-floating.visible {
    opacity: 1;
}