/* ===================================================================
   SSG TOC — Inline body TOC + Floating sidebar trigger
   Prefix: ssg-toc (dùng chung cho mọi dự án SSG)
   Floating sidebar: ftoc-* (floating TOC)
   =================================================================== */

/* ─────────────────────────────────────────────────────────────────
   1. INLINE TOC TRONG BODY (ssg-toc)
   HTML được sinh bởi tools.js > renderToc():
     .ssg-toc
       .ssg-toc__header  (@click="open = !open")
         .ssg-toc__title
           .ssg-toc__icon
         .ssg-toc__toggle  (:class="open ? 'rotate-90' : ''")
           .ssg-toc__toggle-icon
       .ssg-toc__content  (x-show="open")
         ul.ssg-toc__list
           li.ssg-toc__item.ssg-toc__item--level-N
             a.ssg-toc__link
               span.ssg-toc__link-prefix
               span.ssg-toc__link-text
───────────────────────────────────────────────────────────────── */

.ssg-toc {
    background-color: rgb(248, 249, 250);
    border: 1px solid rgb(209, 213, 219);
    border-radius: 0.75rem;
    margin: 2rem 0;
    overflow: hidden;
    box-shadow: rgba(0, 0, 0, 0.05) 0px 1px 2px;
    font-family: Inter, -apple-system, "system-ui", "Segoe UI", Roboto, sans-serif;
}

/* Header — click để toggle */
.ssg-toc__header {
    padding: 0.875rem 1.25rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    cursor: pointer;
    user-select: none;
    transition: background 0.2s;
}

.ssg-toc__header:hover {
    background-color: rgb(241, 245, 249);
}

/* Tiêu đề "Mục lục bài viết" */
.ssg-toc__title {
    font-size: 1.05rem;
    font-weight: 700;
    color: rgb(51, 65, 85);
    display: flex;
    align-items: center;
    gap: 0.6rem;
}

.ssg-toc__icon {
    width: 1.1em;
    height: 1.1em;
    color: rgb(99, 102, 241);
    flex-shrink: 0;
}

/* Mũi tên toggle — dùng SVG thuần CSS thay vì i-lucide (không phụ thuộc UnoCSS) */
.ssg-toc__toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 1.5rem;
    height: 1.5rem;
    color: rgb(148, 163, 184);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    flex-shrink: 0;
}

/* Chevron icon thuần CSS */
.ssg-toc__toggle::before {
    content: '';
    display: block;
    width: 0.5rem;
    height: 0.5rem;
    border-right: 2px solid currentColor;
    border-bottom: 2px solid currentColor;
    transform: rotate(-45deg);
    margin-top: 2px;   /* canh giữa */
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.ssg-toc__toggle.rotate-90::before {
    transform: rotate(45deg);   /* xoay xuống khi mở */
    margin-top: -2px;
}

/* Ẩn span i-lucide-chevron-right gốc (tools.js generate) — đã thay bằng ::before */
.ssg-toc__toggle-icon {
    display: none;
}

/* Nội dung list */
.ssg-toc__content {
    /* Alpine x-show quản lý hiện/ẩn */
}

/* Kiểm soát bullet: override Tailwind prose + reset mọi ::marker */
.ssg-toc__list,
.ssg-toc__list li,
.ssg-toc__item {
    list-style: none !important;
}

/* Reset ::marker bằng cách trực tiếp thay nội dung */
.ssg-toc__list li::marker,
.ssg-toc__item::marker {
    content: '' !important;
    display: none !important;
}

.ssg-toc__list {
    padding: 1.25rem;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
    border-top: 1px solid rgb(226, 232, 240);
    counter-reset: h2-counter 0;  /* khởi tạo counter cho list */
}

/* Item — dùng --toc-indent var từ tools.js (H2=0, H3=1, H4=2) */
.ssg-toc__item {
    padding: 0.15rem 0;
    padding-left: calc(var(--toc-indent, 0) * 1.5rem);
}

.ssg-toc__link {
    text-decoration: none;
    display: flex;
    align-items: flex-start;
    gap: 0.4rem;
    line-height: 1.55;
    transition: color 0.2s, transform 0.2s;
}

.ssg-toc__link:hover {
    transform: translateX(4px);
}

/* Ẩn span '#' cứng từ tools.js — thay bằng counter ::before */
.ssg-toc__link-prefix {
    display: none;
}

.ssg-toc__link-text {
    flex: 1;
}

/* ── Level 2 — H2 ── */
.ssg-toc__item--level-2 {
    counter-reset: h3-counter 0;
    counter-increment: h2-counter 1;
}

.ssg-toc__item--level-2 .ssg-toc__link {
    font-weight: 700;
    color: rgb(30, 41, 59);
    font-size: 0.95rem;
}

/* Số thứ tự H2: "1. " */
.ssg-toc__item--level-2 .ssg-toc__link::before {
    content: counter(h2-counter) ". ";
    font-weight: 700;
    color: rgb(79, 70, 229);
    flex-shrink: 0;
    min-width: 1.8rem;
}

.ssg-toc__item--level-2 .ssg-toc__link:hover {
    color: rgb(79, 70, 229);
}

/* ── Level 3 — H3 ── */
.ssg-toc__item--level-3 {
    counter-reset: h4-counter 0;
    counter-increment: h3-counter 1;
}

.ssg-toc__item--level-3 .ssg-toc__link {
    font-weight: 600;
    color: rgb(71, 85, 105);
    font-size: 0.9rem;
}

/* Số thứ tự H3: "1.1. " */
.ssg-toc__item--level-3 .ssg-toc__link::before {
    content: counter(h2-counter) "." counter(h3-counter) ". ";
    font-weight: 600;
    color: rgb(99, 102, 241);
    flex-shrink: 0;
    min-width: 2.2rem;
}

.ssg-toc__item--level-3 .ssg-toc__link:hover {
    color: rgb(99, 102, 241);
}

/* ── Level 4 — H4 ── */
.ssg-toc__item--level-4 {
    counter-increment: h4-counter 1;
}

.ssg-toc__item--level-4 .ssg-toc__link {
    font-weight: 400;
    color: rgb(100, 116, 139);
    font-size: 0.85rem;
}

/* Số thứ tự H4: "1.1.1. " */
.ssg-toc__item--level-4 .ssg-toc__link::before {
    content: counter(h2-counter) "." counter(h3-counter) "." counter(h4-counter) ". ";
    font-weight: 400;
    color: rgb(148, 163, 184);
    flex-shrink: 0;
    min-width: 2.8rem;
}

.ssg-toc__item--level-4 .ssg-toc__link:hover {
    color: rgb(100, 116, 139);
}


/* ─── Desktop: tab dọc dán mép trái giữa màn hình ─── */
#ftoc-trigger {
    position: fixed;
    left: 0;
    top: 50%;
    transform: translateY(-50%) translateX(-4px);
    z-index: 80;

    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.4rem;
    padding: 0.85rem 0.55rem;

    background: rgb(30, 41, 59);
    color: #fff;
    border: none;
    border-radius: 0 0.5rem 0.5rem 0;
    cursor: pointer;

    box-shadow: 2px 0 14px rgba(0, 0, 0, 0.18);
    transition: padding-left 0.2s ease, box-shadow 0.2s ease,
                opacity 0.25s ease, transform 0.25s ease;

    opacity: 0;
    pointer-events: none;
}

#ftoc-trigger.visible {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(-50%) translateX(0);
}

#ftoc-trigger:hover {
    padding-left: 0.9rem;
    box-shadow: 4px 0 20px rgba(0, 0, 0, 0.22);
    background: rgb(15, 23, 42);
}

#ftoc-trigger svg {
    flex-shrink: 0;
    width: 16px;
    height: 16px;
}

/* Chữ "Mục lục" viết dọc — chỉ hiện trên desktop */
#ftoc-trigger span {
    font-size: 0.58rem;
    font-weight: 800;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    writing-mode: vertical-rl;
    text-orientation: mixed;
    transform: rotate(180deg);
}

/* ─── Mobile (< 768px): FAB tròn góc dưới phải ─── */
@media (max-width: 767px) {
    #ftoc-trigger {
        /* Đặt lại vị trí sang góc dưới phải */
        left: auto;
        right: 1rem;
        bottom: 5rem;           /* trên thanh nav bottom nếu có */
        top: auto;
        transform: translateX(4px) translateY(0);

        /* Dạng nút tròn */
        flex-direction: row;
        width: 3rem;
        height: 3rem;
        padding: 0;
        border-radius: 50%;
        gap: 0;

        /* Shadow nổi hơn */
        box-shadow: 0 4px 16px rgba(0, 0, 0, 0.25);
        justify-content: center;
    }

    #ftoc-trigger.visible {
        transform: translateX(0) translateY(0);
    }

    #ftoc-trigger:hover {
        padding-left: 0;         /* bỏ override padding từ desktop */
        box-shadow: 0 6px 20px rgba(0, 0, 0, 0.3);
    }

    /* Ẩn chữ "Mục lục" trên mobile — chỉ hiện icon */
    #ftoc-trigger span {
        display: none;
    }

    #ftoc-trigger svg {
        width: 20px;
        height: 20px;
    }
}


/* ─────────────────────────────────────────────────────────────────
   3. BACKDROP
───────────────────────────────────────────────────────────────── */

#ftoc-backdrop {
    position: fixed;
    inset: 0;
    z-index: 90;
    background: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(2px);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.25s ease;
}

#ftoc-backdrop.visible {
    opacity: 1;
    pointer-events: auto;
}


/* ─────────────────────────────────────────────────────────────────
   4. SIDEBAR DRAWER — trượt vào từ BÊN TRÁI
───────────────────────────────────────────────────────────────── */

#ftoc-sidebar {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    z-index: 100;
    width: min(340px, 90vw);
    background: #fff;
    box-shadow: 4px 0 32px rgba(0, 0, 0, 0.12);
    display: flex;
    flex-direction: column;
    transform: translateX(-100%);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    overflow: hidden;
    font-family: Inter, -apple-system, "system-ui", sans-serif;
}

#ftoc-sidebar.open {
    transform: translateX(0);
}

/* Header của sidebar */
.ftoc-sidebar-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1.125rem 1.25rem;
    border-bottom: 1px solid rgb(226, 232, 240);
    flex-shrink: 0;
    background: rgb(248, 249, 250);
}

.ftoc-sidebar-title {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.68rem;
    font-weight: 800;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: rgb(51, 65, 85);
}

.ftoc-close-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 2rem;
    height: 2rem;
    border: none;
    background: rgb(241, 245, 249);
    border-radius: 50%;
    cursor: pointer;
    color: rgb(100, 116, 139);
    transition: background 0.15s, color 0.15s;
    flex-shrink: 0;
}

.ftoc-close-btn:hover {
    background: rgb(226, 232, 240);
    color: rgb(30, 41, 59);
}

/* Scrollable nav */
#ftoc-content {
    flex: 1;
    overflow-y: auto;
    padding: 1rem 1rem 2rem;
    scrollbar-width: thin;
    scrollbar-color: #D1D5DB transparent;
}

#ftoc-content::-webkit-scrollbar { width: 4px; }
#ftoc-content::-webkit-scrollbar-thumb {
    background: #D1D5DB;
    border-radius: 2px;
}

/* List trong sidebar */
.ftoc-list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
    counter-reset: h2-counter 0;
}

.ftoc-item {
    list-style: none;
    margin: 0;
    padding: 0;
}

.ftoc-item a {
    display: flex;
    align-items: flex-start;
    padding: 0.4rem 0.75rem;
    border-radius: 0.375rem;
    font-size: 0.8125rem;
    line-height: 1.5;
    text-decoration: none;
    transition: background 0.15s, color 0.15s, transform 0.15s;
    border-left: 2px solid transparent;
}

.ftoc-item a:hover {
    background: rgb(241, 245, 249);
    color: rgb(79, 70, 229);
    border-left-color: rgb(99, 102, 241);
    transform: translateX(2px);
}

.ftoc-item.active > a {
    background: #EEF2FF;
    color: rgb(79, 70, 229);
    border-left-color: rgb(79, 70, 229);
    font-weight: 700;
}

/* H2 trong sidebar */
.ftoc-level-h2 {
    counter-reset: h3-counter 0;
    counter-increment: h2-counter 1;
}

.ftoc-level-h2 > a {
    font-weight: 700;
    color: rgb(30, 41, 59);
}

.ftoc-level-h2 > a::before {
    content: counter(h2-counter) ". ";
    font-weight: 700;
    color: rgb(79, 70, 229);
    margin-right: 0.35rem;
    flex-shrink: 0;
}

/* H3 trong sidebar */
.ftoc-level-h3 {
    counter-reset: h4-counter 0;
    counter-increment: h3-counter 1;
    padding-left: 1.5rem;
}

.ftoc-level-h3 > a {
    font-weight: 600;
    color: rgb(71, 85, 105);
    font-size: 0.775rem;
}

.ftoc-level-h3 > a::before {
    content: counter(h2-counter) "." counter(h3-counter) ". ";
    font-weight: 600;
    color: rgb(99, 102, 241);
    margin-right: 0.35rem;
    flex-shrink: 0;
}

/* H4 trong sidebar */
.ftoc-level-h4 {
    counter-increment: h4-counter 1;
    padding-left: 3rem;
}

.ftoc-level-h4 > a {
    font-weight: 400;
    color: rgb(100, 116, 139);
    font-size: 0.75rem;
}

.ftoc-level-h4 > a::before {
    content: counter(h2-counter) "." counter(h3-counter) "." counter(h4-counter) ". ";
    color: rgb(148, 163, 184);
    margin-right: 0.35rem;
    flex-shrink: 0;
}