/* ==========================================================================
   HỘP MỤC LỤC TĨNH ĐẦU BÀI VIẾT (MÔ PHỎNG THEO IMAGE_0A31AC.PNG)
   ========================================================================== */
.ex-post-toc-box {
    background: #ffffff;
    border: 1px solid #e2e8f0;
    border-radius: 8px;
    margin: 20px 0 30px;
    overflow: hidden;
    box-shadow: 0 1px 3px rgba(0,0,0,0.02);
}

/* Thanh đầu đề xám nhạt nằm trên */
.ex-post-toc-header-box {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: #f8fafc;
    padding: 12px 20px;
    border-bottom: 1px solid #e2e8f0;
}

/* Chữ tiêu đề "Mục lục" */
.ex-post-toc-title-text {
    font-size: 18px;
    font-weight: 700;
    color: #1e293b;
}

/* Nút bấm Ẩn / Hiện */
.ex-post-toc-toggle-btn {
    background: #ffffff;
    border: 1px solid #cbd5e1;
    border-radius: 4px;
    padding: 4px 14px;
    font-size: 14px;
    color: #475569;
    cursor: pointer;
    transition: all 0.2s ease;
}

.ex-post-toc-toggle-btn:hover {
    background: #f1f5f9;
    border-color: #94a3b8;
    color: #1e293b;
}

/* Khung bọc danh sách link liên kết */
.ex-post-toc-links-wrapper {
    padding: 16px 20px;
    transition: max-height 0.25s ease-out;
    max-height: 1000px; /* Đủ rộng để hiển thị hết */
    display: block;
}

/* Trạng thái ẩn danh sách khi click nút bấm */
.ex-post-toc-links-wrapper.ex-toc-hidden {
    display: none;
}

/* Danh sách link bên trong hộp tĩnh */
.ex-post-toc-links .ex-post-toc-link {
    display: block;
    color: #0284c7;
    text-decoration: none;
    line-height: 1.8;
    padding: 4px 0;
    font-size: 15px;
    text-align: left;
}

.ex-post-toc-links .ex-post-toc-link:hover {
    color: #e30019;
    text-decoration: underline;
}

/* ==========================================================================
   HỆ THỐNG THANH TOC STICKY TRƯỢT THEO MÀN HÌNH (FULL NỀN)
   ========================================================================== */
.ex-post-toc-sticky {
    display: none;
    position: fixed;
    top: 74px;
    left: 0;
    width: 100%;
    z-index: 10050;
    background: #ffffff;
    border-bottom: 1px solid #e2e8f0;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

.ex-post-toc-sticky.ex-post-toc-active {
    display: block;
}

.ex-post-toc-container {
    position: relative;
    width: 100%;
    max-width: 870px; /* Thẳng lề tuyệt đối với lề bài viết rộng 870px */
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: transparent;
}

.ex-post-toc-current {
    display: block;
    margin: 0;
    padding: 10px 60px 10px 15px; 
    width: 100%;
    cursor: pointer;
}

.ex-post-toc-current-link {
    display: block;
    font-size: 15px;
    font-weight:600;
    text-decoration: none;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    text-align: left;
}

.ex-post-toc-toggle {
    position: absolute;
    right: 0px;
    top: 50%;
    transform: translateY(-50%);
    width: 30px;
    height: 30px;
    border: 1px solid #0d6efd;
    border-radius: 4px;
    background: #ffffff;
    cursor: pointer;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
}

.ex-post-toc-toggle::before {
    content: "";
    position: absolute;
    top: 40%;
    width: 8px;
    height: 8px;
    border-right: 2px solid #0d6efd;
    border-bottom: 2px solid #0d6efd;
    transform: rotate(45deg);
    transition: transform 0.2s, top 0.2s;
}

.ex-post-toc-open .ex-post-toc-toggle::before {
    top: 55%;
    transform: rotate(-135deg);
}

.ex-post-toc-dropdown {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    padding: 15px 20px !important;
    background: #ffffff;
    border: 1px solid #e2e8f0;
    border-top: none;
    max-height: 380px;
    overflow-y: auto;
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.1);
}

.ex-post-toc-open .ex-post-toc-dropdown {
    display: block;
}

.ex-post-toc-dropdown .ex-post-toc-link {
    display: block;
    color: #006edc;
    text-decoration: none;
    line-height: 2;
    padding: 4px 0;
    font-size: 15px;
    text-align: left;
}

.ex-post-toc-dropdown .ex-post-toc-link:hover,
.ex-post-toc-dropdown .ex-post-toc-link-active {
    color: #e30019;
    font-weight: 700;
}

/* Responsive Điện thoại & Tablet */
@media (max-width: 991px) {
    .ex-post-toc-sticky {
        top: 60px;
    }

    .ex-post-toc-container {
        max-width: 100%;
        padding: 0 15px;
    }

    .ex-post-toc-current {
        padding: 12px 52px 12px 10px;
    }

    .ex-post-toc-current-link {
        font-size: 14px;
    }

    .ex-post-toc-toggle {
        right: 15px;
    }

    .ex-post-toc-dropdown {
        max-height: 55vh;
        padding: 10px 15px;
    }
}