/* Tài liệu hướng dẫn sử dụng (/huong-dan/tai-lieu): khung theo trang hướng dẫn, khối nội dung theo quy ước chương
   (docs/huong-dan-su-dung/tools/quy-uoc-viet-chuong.md: ol.steps, figure, .note/.tip/.warn, span.ui, bảng). */
:root {
    --mn-ink: #14213d;
    --mn-text: #33415c;
    --mn-muted: #5b6b84;
    --mn-navy: #0e3a6b;
    --mn-blue: #1c64c8;
    --mn-blue-soft: #eef4fb;
    --mn-line: #e4eaf2;
    --mn-orange: #f07c1e;
}

/* Banner */
.mn-hero { background: var(--mn-navy); color: #fff; padding: 44px 0 34px; }
.mn-hero .crumb { font-size: .88rem; color: rgba(255, 255, 255, .7); }
.mn-hero .crumb a { color: rgba(255, 255, 255, .78); text-decoration: none; }
.mn-hero .crumb a:hover { color: #fff; }
.mn-hero .crumb span { margin: 0 4px; }
.mn-part { margin-top: 14px; font-size: .82rem; font-weight: 700; letter-spacing: .05em; text-transform: uppercase; color: #ffb877; }
.mn-hero h1 { margin: 8px 0 10px; font-size: 2.1rem; font-weight: 800; max-width: 900px; }
.mn-hero .lead { max-width: 820px; font-size: 1.05rem; color: rgba(255, 255, 255, .9); margin-bottom: 18px; }
.mn-tools { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; }
.mn-search { position: relative; flex: 1 1 360px; max-width: 560px; }
.mn-search > i { position: absolute; left: 14px; top: 50%; transform: translateY(-50%); color: var(--mn-muted); }
.mn-search input { width: 100%; height: 46px; padding: 0 14px 0 40px; border: 0; border-radius: 12px; font-size: 1rem; color: var(--mn-ink); }
.mn-search input:focus { outline: 3px solid rgba(240, 124, 30, .55); }
.mn-results { position: absolute; z-index: 30; left: 0; right: 0; top: calc(100% + 6px); display: none; max-height: 420px; overflow: auto; background: #fff; border-radius: 12px; box-shadow: 0 18px 44px rgba(10, 30, 60, .3); }
.mn-results.open { display: block; }
.mn-results a { display: block; padding: 10px 14px; border-bottom: 1px solid var(--mn-line); color: var(--mn-ink); text-decoration: none; }
.mn-results a:hover, .mn-results a.focus { background: var(--mn-blue-soft); }
.mn-results b { display: block; font-size: .95rem; }
.mn-results span { display: block; font-size: .85rem; color: var(--mn-muted); }
.mn-results mark { padding: 0; background: #ffe2c4; color: inherit; }
.mn-results .empty { padding: 12px 14px; color: var(--mn-muted); }
.mn-btn { display: inline-flex; align-items: center; gap: 6px; height: 46px; padding: 0 16px; border: 1px solid rgba(255, 255, 255, .4); border-radius: 12px; background: transparent; color: #fff; font-weight: 600; text-decoration: none; }
.mn-btn:hover { background: rgba(255, 255, 255, .1); color: #fff; }
.mn-meta { display: flex; flex-wrap: wrap; gap: 18px; margin-top: 16px; font-size: .88rem; color: rgba(255, 255, 255, .75); }
.mn-meta i { margin-right: 4px; }

/* Khung: mục lục trái + nội dung */
.mn-body { padding: 32px 0 72px; background: #f7fafd; }
.mn-grid { display: grid; grid-template-columns: 290px minmax(0, 1fr); gap: 28px; align-items: start; }
.mn-nav { position: sticky; top: 84px; max-height: calc(100vh - 100px); overflow: auto; padding: 10px; border: 1px solid var(--mn-line); border-radius: 16px; background: #fff; }
.mn-nav summary { display: none; }
.mn-nav a { display: block; padding: 6px 10px; border-radius: 8px; color: var(--mn-ink); text-decoration: none; font-size: .9rem; line-height: 1.35; }
.mn-nav a:hover { background: var(--mn-blue-soft); }
.mn-nav-home { font-weight: 600; }
.mn-nav-part { margin: 12px 10px 4px; font-size: .72rem; font-weight: 700; letter-spacing: .05em; text-transform: uppercase; color: #8592a6; }
.mn-nav a.active { background: var(--mn-blue); color: #fff; font-weight: 600; }
.mn-nav-toc { margin: 2px 0 6px 10px; padding-left: 8px; border-left: 2px solid var(--mn-line); }
.mn-nav-toc a { font-size: .84rem; color: var(--mn-text); padding: 4px 8px; }
.mn-nav-toc a.active { background: var(--mn-blue-soft); color: var(--mn-blue); font-weight: 600; }

/* Thân chương */
.mn-content { padding: 32px 40px; border: 1px solid var(--mn-line); border-radius: 18px; background: #fff; color: var(--mn-text); font-size: 1.02rem; line-height: 1.75; }
.mn-content > :first-child { margin-top: 0; }
.mn-content h2 { margin: 34px 0 14px; font-size: 1.45rem; font-weight: 800; color: var(--mn-ink); }
.mn-content h3 { margin: 40px 0 10px; padding-top: 4px; font-size: 1.32rem; font-weight: 800; color: var(--mn-ink); scroll-margin-top: 90px; }
.mn-content h4 { margin: 26px 0 8px; font-size: 1.08rem; font-weight: 700; color: var(--mn-navy); scroll-margin-top: 90px; }
.mn-content .anchor { margin-left: 8px; color: #b8c4d6; text-decoration: none; opacity: 0; transition: opacity .15s; }
.mn-content h3:hover .anchor, .mn-content h4:hover .anchor { opacity: 1; }
.mn-content a { color: var(--mn-blue); }
.mn-content .ui { display: inline-block; padding: 0 7px; border: 1px solid #c9dcfb; border-radius: 6px; background: #eaf1ff; color: var(--mn-navy); font-weight: 600; font-size: .92em; line-height: 1.5; white-space: nowrap; }
.mn-content ol.steps { list-style: none; counter-reset: step; padding: 0; margin: 16px 0; }
.mn-content ol.steps > li { counter-increment: step; position: relative; padding: 2px 0 22px 52px; }
.mn-content ol.steps > li::before { content: counter(step); position: absolute; left: 0; top: 0; width: 34px; height: 34px; border-radius: 50%; background: var(--mn-blue); color: #fff; font-weight: 700; text-align: center; line-height: 34px; }
.mn-content ol.steps > li:not(:last-child)::after { content: ""; position: absolute; left: 16px; top: 38px; bottom: 4px; width: 2px; background: #dbe7f7; }
.mn-content ol.steps > li > p:first-child { margin-top: 4px; }
.mn-content figure { margin: 12px 0 6px; }
.mn-content figure img { display: block; max-width: 100%; height: auto; border: 1px solid #dce5f0; border-radius: 10px; box-shadow: 0 6px 20px rgba(20, 33, 61, .08); background: #fff; cursor: zoom-in; }
.mn-content figcaption { margin-top: 6px; font-size: .88rem; font-style: italic; color: var(--mn-muted); }
.mn-content .note, .mn-content .tip, .mn-content .warn { position: relative; margin: 16px 0; padding: 12px 16px 12px 46px; border-left: 5px solid; border-radius: 10px; }
.mn-content .note::before, .mn-content .tip::before, .mn-content .warn::before { position: absolute; left: 15px; top: 11px; font-family: "bootstrap-icons"; font-size: 1.1rem; }
.mn-content .note { background: #eef5fd; border-color: #5aa0e8; }
.mn-content .note::before { content: "\F431"; color: #3b82d6; }
.mn-content .tip { background: #edf8f1; border-color: #3fae6a; }
.mn-content .tip::before { content: "\F46B"; color: #2f9c5a; }
.mn-content .warn { background: #fff5e8; border-color: var(--mn-orange); }
.mn-content .warn::before { content: "\F33A"; color: #d96a10; }
.mn-content table { display: block; width: 100%; margin: 14px 0; overflow-x: auto; border-collapse: collapse; font-size: .95rem; }
.mn-content th, .mn-content td { padding: 8px 12px; border: 1px solid var(--mn-line); text-align: left; vertical-align: top; }
.mn-content th { background: #f3f7fc; color: var(--mn-navy); }
.mn-content code { padding: 1px 6px; border-radius: 5px; background: #f1f4f9; font-size: .9em; }

/* Mục lục toàn bộ (trang /huong-dan/tai-lieu) */
.mn-cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 14px; margin: 12px 0 26px; }
.mn-card { position: relative; display: block; padding: 18px 18px 16px 62px; border: 1px solid var(--mn-line); border-radius: 14px; background: #fff; color: var(--mn-ink); text-decoration: none; transition: transform .15s, box-shadow .15s; }
.mn-card:hover { transform: translateY(-2px); box-shadow: 0 10px 26px rgba(20, 33, 61, .1); color: var(--mn-ink); }
.mn-card .n { position: absolute; left: 16px; top: 16px; width: 34px; height: 34px; border-radius: 10px; background: var(--mn-blue-soft); color: var(--mn-blue); font-weight: 800; display: grid; place-items: center; }
.mn-card h3 { margin: 0 0 4px; font-size: 1.02rem; font-weight: 700; }
.mn-card p { margin: 0 0 6px; font-size: .9rem; color: var(--mn-muted); line-height: 1.5; }
.mn-card small { color: #8592a6; }

/* Chương trước / sau */
.mn-pager { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin-top: 18px; }
.mn-pager a { display: block; padding: 14px 18px; border: 1px solid var(--mn-line); border-radius: 14px; background: #fff; color: var(--mn-ink); font-weight: 700; text-decoration: none; }
.mn-pager a:hover { border-color: var(--mn-blue); }
.mn-pager a small { display: block; margin-bottom: 2px; font-weight: 600; color: var(--mn-blue); }
.mn-pager .next { text-align: right; }

/* Phóng ảnh */
.mn-lightbox { position: fixed; inset: 0; z-index: 2000; display: flex; align-items: center; justify-content: center; padding: 20px; background: rgba(8, 14, 28, .9); cursor: zoom-out; }
.mn-lightbox[hidden] { display: none; }
.mn-lightbox img { max-width: 100%; max-height: 100%; border-radius: 8px; background: #fff; }

.mn-grid > * { min-width: 0; }
/* Cột trái cao bằng cả hàng để mục lục (sticky) dính theo khi cuộn hết chương. */
.mn-grid > aside { align-self: stretch; }
@media (max-width: 991.98px) {
    /* minmax(0, …): cột không bị nội dung rộng (bảng, nhãn nút dài) kéo giãn quá màn hình. */
    .mn-grid { grid-template-columns: minmax(0, 1fr); }
    .mn-nav { position: static; max-height: none; }
    .mn-nav summary { display: flex; align-items: center; gap: 8px; padding: 6px 8px; font-weight: 700; cursor: pointer; }
    .mn-nav:not([open]) { padding: 6px 10px; }
    .mn-content { padding: 22px 18px; }
    .mn-hero h1 { font-size: 1.65rem; }
}
@media (max-width: 575.98px) {
    /* Nhãn nút dài (vd "Cho phép tự mở lại (sau cập nhật, khi bật máy)") xuống dòng thay vì đẩy trang rộng quá màn hình. */
    .mn-content .ui { white-space: normal; }
    .mn-content ol.steps > li { padding-left: 44px; }
    .mn-pager { grid-template-columns: 1fr; }
    .mn-pager .next { text-align: left; }
    .mn-btn { flex: 1 1 auto; justify-content: center; }
}
@media print {
    .mn-hero .crumb, .mn-tools, aside, .mn-pager, header, footer, .navbar { display: none !important; }
    .mn-hero { background: #fff; color: #000; padding: 0; }
    .mn-hero .lead, .mn-meta { color: #333; }
    .mn-grid { display: block; }
    .mn-content { border: 0; padding: 0; }
    .mn-content figure { break-inside: avoid; }
}