/* ===============================
   ABOUT PAGE – HẬU NINH
   =============================== */

/* Scroll mượt */
html {
    scroll-behavior: smooth;
}

/* ===============================
   CONTAINER PADDING
   =============================== */
.px-6 {
    padding-left: 6rem;
    padding-right: 6rem;
}

/* Mobile: px-0 */
@media (max-width: 576px) {
    .px-6 {
        padding-left: 15px;
        padding-right: 15px;
    }
}

/* ===============================
   TOC CARD (NỘI DUNG)
   =============================== */
.toc-card {
    border-radius: 0;
    border: 1px solid #eaeaea;
    background: #eaeaea;
    text-transform: uppercase;
}

/* TOC LIST */
.toc-card ul li {
    margin-bottom: 8px;
}

.toc-card li {
    margin-left: 15px;
}

.toc-card ul li:last-child {
    margin-bottom: 0;
}

.toc-card a {
    color: #333;
    text-decoration: none;
    font-size: 15px;
    transition: all 0.2s ease;
}

.toc-card a:hover {
    padding-left: 6px;
}

#gioi-thieu{
    font-size: 24px;
}

/* ===============================
   SECTION CHUNG
   =============================== */
section {
    scroll-margin-top: 120px;
    text-align: justify;
}

section h3 {
    text-transform: uppercase;
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 16px;
    position: relative;
}

section p {
    font-size: 16px;
    line-height: 1.7;
    color: #333;
    margin-bottom: 12px;
}

/* ===============================
   LIST TRONG SECTION
   =============================== */
section ul {
    padding-left: 18px;
    margin-bottom: 0;
}

section ul li {
    margin-bottom: 10px;
    font-size: 16px;
    line-height: 1.6;
}

section ul li strong {
    font-weight: 600;
}

/* ===============================
   RIÊNG SECTION GIỚI THIỆU
   =============================== */
#gioi-thieu p {
    font-size: 17px;
}

#gioi-thieu strong {
    font-weight: 700;
}

/* ===============================
   RESPONSIVE TEXT
   =============================== */
@media (max-width: 576px) {
    .toc-card a:hover {
        padding-left: 0;
    }
    section h3 {
        font-size: 20px;
    }

    section p,
    section ul li {
        font-size: 15px;
    }
}

/* ===============================
   TOC TOGGLE – SMOOTH ANIMATION
   =============================== */

.toc-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 28px;
}

.toc-header h5 {
    margin: 0;
    color: var(--primary);
    font-size: 18px;
    font-weight: 600;
}

/* nút toggle */
.toc-toggle {
    background: var(--primary);
    color: #fff;
    border: none;
    width: 36px;
    height: 36px;
    font-size: 18px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.3s ease;
}

/* icon xoay khi thu */
.toc-card.is-collapsed .toc-toggle {
    transform: rotate(-90deg);
}

/* BODY – key animation */
.toc-body {
    overflow: hidden;
    max-height: 500px; /* đủ lớn cho danh sách */
    opacity: 1;
    padding: 20px 28px;
    transition:
        max-height 0.4s ease,
        opacity 0.25s ease,
        padding 0.3s ease;
}

/* trạng thái thu */
.toc-card.is-collapsed .toc-body {
    max-height: 0;
    opacity: 0;
    padding-top: 0;
    padding-bottom: 0;
}

/* mobile */
@media (max-width: 576px) {
    .toc-header {
        padding: 16px;
    }

    .toc-body {
        padding: 16px;
    }
}