/* =========================================================
   Chuyên mục Chuyển đổi số – Bình dân học vụ số · Xã Thiện Hưng
   Giao diện công khai
   ========================================================= */
:root {
  --primary: #0F4C81;
  --primary-dark: #0B3A63;
  --primary-soft: #E6EEF7;
  --navy: #0B2545;
  --ink: #0B2545;
  --text: #1E2A3B;
  --muted: #4A5568;
  --subtle: #6B7686;
  --line: #D9DEE5;
  --line-soft: #E8ECF1;
  --bg: #F4F6F8;
  --surface: #FFFFFF;
  --accent: #F2A541;
  --accent-ink: #3B2200;
  --red: #C8102E;
  --gold: #FFCD00;
  --warn-bg: #FFF4E5;
  --warn-line: #F2C27E;
  --warn-ink: #7A3E00;
  --radius: 16px;
  --radius-sm: 10px;
  --shadow-sm: 0 1px 2px rgba(11, 37, 69, .06), 0 1px 3px rgba(11, 37, 69, .08);
  --shadow: 0 4px 12px rgba(11, 37, 69, .08), 0 1px 3px rgba(11, 37, 69, .06);
  --shadow-lg: 0 18px 40px rgba(11, 37, 69, .14);
  --container: 1200px;
  --font: 'Be Vietnam Pro', 'Segoe UI', system-ui, -apple-system, sans-serif;
}
html { font-size: 16px; -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: 96px; }
html[data-fs="1"] { font-size: 17.5px; }
html[data-fs="2"] { font-size: 19px; }
*, *::before, *::after { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text); font-family: var(--font); font-size: 1rem; line-height: 1.6; text-rendering: optimizeLegibility; -webkit-font-smoothing: antialiased; }
img, video, iframe { max-width: 100%; }
img { height: auto; display: block; }
a { color: var(--primary); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: var(--navy); }
h1, h2, h3, h4 { color: var(--ink); line-height: 1.25; margin: 0; }
p { margin: 0; }
button { font: inherit; cursor: pointer; }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; border-radius: 4px; }
.container { max-width: var(--container); margin: 0 auto; padding: 0 24px; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; }
.skip-link { position: absolute; left: 12px; top: -60px; z-index: 1000; background: var(--accent); color: var(--accent-ink); padding: 10px 16px; border-radius: 8px; font-weight: 700; }
.skip-link:focus { top: 12px; }
.ic { flex-shrink: 0; vertical-align: middle; }

/* ---------- Thanh tiện ích trên cùng ---------- */
.topbar { background: var(--navy); color: #C9D5E4; font-size: .8125rem; }
.topbar .container { display: flex; align-items: center; justify-content: space-between; gap: 16px; min-height: 38px; }
.topbar a { color: #fff; text-decoration: none; }
.topbar-left, .topbar-right { display: flex; align-items: center; gap: 18px; flex-wrap: wrap; }
.topbar-item { display: inline-flex; align-items: center; gap: 6px; }
.fs-control { display: inline-flex; align-items: center; gap: 2px; background: rgba(255,255,255,.08); border-radius: 999px; padding: 2px; }
.fs-control button { background: transparent; border: 0; color: #fff; min-width: 32px; height: 28px; border-radius: 999px; font-weight: 700; font-size: .8125rem; }
.fs-control button[aria-pressed="true"] { background: #fff; color: var(--navy); }
.fs-control button:hover { background: rgba(255,255,255,.18); }
.fs-control button[aria-pressed="true"]:hover { background: #fff; }

/* ---------- Đầu trang ---------- */
.site-header { background: var(--surface); border-bottom: 1px solid var(--line); position: sticky; top: 0; z-index: 50; transition: box-shadow .2s; }
.site-header.scrolled { box-shadow: var(--shadow); }
.site-header .container { display: flex; align-items: center; justify-content: space-between; gap: 20px; min-height: 76px; }
.brand { display: flex; align-items: center; gap: 14px; text-decoration: none; color: var(--ink); min-width: 0; }
.brand-logo { width: 52px; height: 52px; flex-shrink: 0; }
.brand-org { font-size: .78rem; font-weight: 700; letter-spacing: .06em; color: var(--muted); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.brand-name { font-size: 1.2rem; font-weight: 800; color: var(--ink); line-height: 1.2; }
.main-nav { display: flex; align-items: center; gap: 2px; }
.main-nav > a, .nav-drop > button { display: inline-flex; align-items: center; gap: 4px; padding: 10px 14px; text-decoration: none; color: var(--ink); font-weight: 600; font-size: .95rem; border-radius: 8px; border: 0; background: transparent; white-space: nowrap; }
.main-nav > a:hover, .nav-drop > button:hover { background: var(--primary-soft); color: var(--primary); }
.main-nav > a[aria-current="page"] { background: var(--primary); color: #fff; }
.nav-drop { position: relative; }
.nav-drop-menu { position: absolute; top: calc(100% + 8px); left: 50%; transform: translateX(-50%) translateY(6px); background: #fff; border: 1px solid var(--line); border-radius: 14px; box-shadow: var(--shadow-lg); padding: 8px; width: 340px; opacity: 0; visibility: hidden; transition: .16s ease; }
.nav-drop:hover .nav-drop-menu, .nav-drop:focus-within .nav-drop-menu, .nav-drop.open .nav-drop-menu { opacity: 1; visibility: visible; transform: translateX(-50%) translateY(0); }
.nav-drop-menu a { display: flex; align-items: center; gap: 12px; padding: 10px 12px; border-radius: 10px; text-decoration: none; color: var(--ink); font-weight: 600; font-size: .92rem; }
.nav-drop-menu a:hover { background: var(--bg); }
.nav-drop-menu .cat-dot { width: 34px; height: 34px; border-radius: 9px; display: inline-flex; align-items: center; justify-content: center; color: #fff; }
.header-actions { display: flex; align-items: center; gap: 6px; }
.icon-btn { width: 44px; height: 44px; display: inline-flex; align-items: center; justify-content: center; border-radius: 10px; border: 1px solid var(--line); background: #fff; color: var(--ink); }
.icon-btn:hover { background: var(--primary-soft); color: var(--primary); border-color: transparent; }
.menu-toggle { display: none; }

/* Ô tìm kiếm thả xuống */
.search-panel { border-top: 1px solid var(--line); background: #fff; display: none; }
.search-panel.open { display: block; }
.search-panel form { display: flex; gap: 10px; padding: 14px 0; }
.search-input { flex: 1; min-height: 50px; border: 2px solid var(--line); border-radius: 12px; padding: 0 16px; font: inherit; font-size: 1.05rem; color: var(--ink); background: #fff; }
.search-input:focus { border-color: var(--primary); outline: none; }

/* Ngăn kéo menu điện thoại */
.drawer { position: fixed; inset: 0; z-index: 100; display: none; }
.drawer.open { display: block; }
.drawer-backdrop { position: absolute; inset: 0; background: rgba(11,37,69,.5); }
.drawer-panel { position: absolute; top: 0; right: 0; bottom: 0; width: min(360px, 88vw); background: #fff; overflow-y: auto; padding: 18px; display: flex; flex-direction: column; gap: 6px; animation: slideIn .2s ease; }
@keyframes slideIn { from { transform: translateX(30px); opacity: 0; } to { transform: none; opacity: 1; } }
.drawer-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 8px; }
.drawer-panel a { display: flex; align-items: center; gap: 12px; min-height: 48px; padding: 8px 12px; border-radius: 10px; text-decoration: none; color: var(--ink); font-weight: 600; }
.drawer-panel a:hover, .drawer-panel a[aria-current="page"] { background: var(--primary-soft); color: var(--primary); }
.drawer-label { font-size: .75rem; font-weight: 700; letter-spacing: .08em; color: var(--subtle); padding: 14px 12px 4px; }

/* ---------- Đường dẫn ---------- */
.breadcrumb { font-size: .875rem; color: var(--muted); padding: 16px 0; display: flex; flex-wrap: wrap; align-items: center; gap: 6px; }
.breadcrumb a { color: var(--muted); text-decoration: none; }
.breadcrumb a:hover { color: var(--primary); text-decoration: underline; }
.breadcrumb .sep { color: #A0AAB8; }
.breadcrumb [aria-current] { color: var(--ink); font-weight: 600; }

/* ---------- Nút ---------- */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 48px; padding: 0 22px; border-radius: 10px; font-weight: 700; text-decoration: none; border: 2px solid transparent; font-size: 1rem; transition: transform .12s, background .15s, box-shadow .15s; white-space: nowrap; }
.btn:hover { transform: translateY(-1px); }
.btn-accent { background: var(--accent); color: var(--accent-ink); }
.btn-accent:hover { background: #F7B65E; color: var(--accent-ink); box-shadow: 0 6px 16px rgba(242,165,65,.35); }
.btn-ghost-light { border-color: rgba(255,255,255,.9); color: #fff; }
.btn-ghost-light:hover { background: rgba(255,255,255,.12); color: #fff; }
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); color: #fff; }
.btn-outline { border-color: var(--line); background: #fff; color: var(--ink); }
.btn-outline:hover { border-color: var(--primary); color: var(--primary); }
.btn-sm { min-height: 40px; padding: 0 14px; font-size: .9rem; }

/* ---------- Banner ---------- */
.hero { margin-top: 8px; }
.hero-card { position: relative; overflow: hidden; background: var(--primary); color: #fff; border-radius: 24px; padding: 56px; display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 48px; align-items: center; isolation: isolate; }
.hero-card::before { content: ""; position: absolute; inset: 0; z-index: -1; background:
  radial-gradient(600px 300px at 100% 0%, rgba(255,255,255,.14), transparent 60%),
  radial-gradient(500px 260px at 0% 100%, rgba(242,165,65,.20), transparent 60%),
  radial-gradient(rgba(255,255,255,.10) 1.2px, transparent 1.2px) 0 0 / 22px 22px; }
.hero-card::after { content: ""; position: absolute; right: -120px; bottom: -160px; width: 420px; height: 420px; border-radius: 50%; border: 60px solid rgba(255,255,255,.05); z-index: -1; }
.hero-badge { display: inline-block; background: var(--accent); color: var(--accent-ink); font-weight: 800; font-size: .78rem; letter-spacing: .1em; padding: 6px 14px; border-radius: 999px; }
.hero h1 { color: #fff; font-size: clamp(2rem, 4.2vw, 3rem); line-height: 1.12; font-weight: 800; margin: 18px 0 16px; letter-spacing: -.01em; }
.hero p.lead { font-size: 1.15rem; color: #E6EEF7; max-width: 620px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }
.hero-stats { display: flex; flex-wrap: wrap; gap: 28px; margin-top: 34px; padding-top: 24px; border-top: 1px solid rgba(255,255,255,.18); }
.hero-stat b { display: block; font-size: 1.6rem; font-weight: 800; color: #fff; line-height: 1.1; }
.hero-stat span { font-size: .85rem; color: #C9D8EA; }
.qr-card { background: #fff; color: var(--ink); border-radius: 18px; padding: 20px; width: 236px; display: flex; flex-direction: column; align-items: center; gap: 10px; box-shadow: 0 20px 40px rgba(0,0,0,.18); }
.qr-card img { width: 180px; height: 180px; image-rendering: pixelated; }
.qr-card .qr-title { font-weight: 800; font-size: .95rem; text-align: center; }
.qr-card .qr-sub { font-size: .78rem; color: var(--muted); text-align: center; }
.qr-card a { font-size: .82rem; font-weight: 700; display: inline-flex; gap: 6px; align-items: center; }

/* ---------- Tiêu đề khối ---------- */
.section { padding-top: 64px; }
.section-head { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: flex-end; gap: 12px; margin-bottom: 24px; }
.eyebrow { font-size: .78rem; font-weight: 800; letter-spacing: .1em; color: var(--primary); text-transform: uppercase; display: inline-flex; align-items: center; gap: 8px; }
.eyebrow::before { content: ""; width: 22px; height: 3px; border-radius: 2px; background: var(--accent); }
.section-title { font-size: clamp(1.5rem, 2.6vw, 1.9rem); font-weight: 800; margin-top: 6px; }
.section-desc { color: var(--muted); margin-top: 6px; }
.more-link { font-weight: 700; text-decoration: none; display: inline-flex; align-items: center; gap: 6px; }
.more-link:hover { gap: 10px; }

/* ---------- Thẻ nhóm nội dung ---------- */
.cat-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; }
.cat-card { --c: var(--primary); position: relative; display: flex; flex-direction: column; gap: 10px; background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 24px; text-decoration: none; color: var(--ink); transition: transform .16s, box-shadow .16s, border-color .16s; overflow: hidden; }
.cat-card::after { content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 4px; background: var(--c); opacity: 0; transition: opacity .16s; }
.cat-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-lg); border-color: transparent; color: var(--ink); }
.cat-card:hover::after { opacity: 1; }
.cat-card-top { display: flex; align-items: center; justify-content: space-between; }
.cat-icon { width: 52px; height: 52px; border-radius: 14px; display: flex; align-items: center; justify-content: center; color: var(--c); background: var(--c-soft, #E6EEF7); }
.cat-num { font-size: 2rem; font-weight: 800; color: var(--line); line-height: 1; }
.cat-name { font-size: 1.2rem; font-weight: 800; margin-top: 6px; }
.cat-desc { font-size: .95rem; color: var(--muted); }
.cat-foot { margin-top: auto; padding-top: 10px; display: flex; justify-content: space-between; align-items: center; font-size: .9rem; }
.cat-foot .count { color: var(--subtle); }
.cat-foot .go { font-weight: 700; color: var(--c); display: inline-flex; align-items: center; gap: 4px; }

/* ---------- Cảnh báo ---------- */
.alert-box { background: var(--warn-bg); border: 1px solid var(--warn-line); border-radius: var(--radius); padding: 22px 26px; display: flex; flex-wrap: wrap; gap: 18px; align-items: center; }
.alert-icon { width: 56px; height: 56px; border-radius: 50%; background: #FDE3BF; color: var(--warn-ink); display: flex; align-items: center; justify-content: center; flex-shrink: 0; }
.alert-body { flex: 999 1 380px; min-width: 0; color: #5C2E00; }
.alert-body .t { font-weight: 800; font-size: 1.12rem; color: var(--warn-ink); margin-bottom: 2px; }
.btn-warn { background: var(--warn-ink); color: #fff; }
.btn-warn:hover { background: #5C2E00; color: #fff; }

/* ---------- Thẻ bài viết ---------- */
.chip { display: inline-flex; align-items: center; gap: 6px; font-size: .78rem; font-weight: 700; color: var(--c, var(--primary)); text-decoration: none; }
.chip-solid { background: var(--c, var(--primary)); color: #fff; padding: 4px 10px; border-radius: 999px; }
.chip-solid:hover { color: #fff; filter: brightness(1.1); }
.kind-badge { display: inline-block; font-size: .72rem; font-weight: 700; padding: 3px 9px; border-radius: 6px; background: var(--bg); color: var(--muted); border: 1px solid var(--line); }
.meta { display: flex; flex-wrap: wrap; align-items: center; gap: 6px 14px; font-size: .82rem; color: var(--subtle); }
.meta span { display: inline-flex; align-items: center; gap: 5px; }

.post-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 22px; }
.post-grid.cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.post-grid.cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.card { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; display: flex; flex-direction: column; transition: transform .16s, box-shadow .16s; }
.card:hover { transform: translateY(-3px); box-shadow: var(--shadow-lg); }
.card-media { position: relative; display: block; aspect-ratio: 16 / 9; background: #DCE4EE; overflow: hidden; }
.card-media img { width: 100%; height: 100%; object-fit: cover; transition: transform .4s; }
.card:hover .card-media img { transform: scale(1.04); }
.card-media .chip-solid { position: absolute; left: 12px; top: 12px; box-shadow: 0 2px 6px rgba(0,0,0,.2); }
.card-body { padding: 18px 20px 20px; display: flex; flex-direction: column; gap: 10px; flex: 1; }
.card-title { font-size: 1.08rem; font-weight: 700; line-height: 1.38; }
.card-title a { color: var(--ink); text-decoration: none; background-image: linear-gradient(currentColor, currentColor); background-size: 0 1px; background-repeat: no-repeat; background-position: 0 100%; transition: background-size .25s; }
.card-title a:hover { color: var(--primary); background-size: 100% 1px; }
.card-title a::after { content: ""; position: absolute; inset: 0; }
.card { position: relative; }
.card-media, .card .chip-solid { z-index: 1; }
.card-excerpt { font-size: .93rem; color: var(--muted); display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }
.card .meta { margin-top: auto; }

/* Bài nổi bật */
.news-layout { display: grid; grid-template-columns: minmax(0, 1.45fr) minmax(0, 1fr); gap: 22px; }
.feature { position: relative; border-radius: var(--radius); overflow: hidden; background: var(--navy); min-height: 460px; display: flex; align-items: flex-end; color: #fff; isolation: isolate; }
.feature img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; z-index: -2; transition: transform .5s; }
.feature:hover img { transform: scale(1.03); }
.feature::before { content: ""; position: absolute; inset: 0; z-index: -1; background: linear-gradient(180deg, rgba(11,37,69,0) 25%, rgba(11,37,69,.92) 100%); }
.feature-body { padding: 30px; display: flex; flex-direction: column; gap: 12px; }
.feature-title { font-size: clamp(1.35rem, 2.4vw, 1.85rem); font-weight: 800; line-height: 1.25; }
.feature-title a { color: #fff; text-decoration: none; }
.feature-title a::after { content: ""; position: absolute; inset: 0; }
.feature-title a:hover { text-decoration: underline; text-decoration-thickness: 2px; }
.feature p { color: #D5DEE9; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.feature .meta { color: #C0CCDB; }
.feature .chip-solid { position: relative; z-index: 2; align-self: flex-start; }

.list-compact { display: flex; flex-direction: column; gap: 14px; }
.row-card { position: relative; display: grid; grid-template-columns: 148px minmax(0, 1fr); gap: 16px; background: #fff; border: 1px solid var(--line); border-radius: 14px; padding: 12px; transition: box-shadow .16s, transform .16s; }
.row-card:hover { box-shadow: var(--shadow); transform: translateY(-2px); }
.row-card .thumb { aspect-ratio: 4 / 3; border-radius: 10px; overflow: hidden; background: #DCE4EE; }
.row-card .thumb img { width: 100%; height: 100%; object-fit: cover; }
.row-card .body { display: flex; flex-direction: column; gap: 6px; min-width: 0; padding: 2px 4px 2px 0; }
.row-card h3 { font-size: 1rem; font-weight: 700; line-height: 1.38; display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }
.row-card h3 a { color: var(--ink); text-decoration: none; }
.row-card h3 a::after { content: ""; position: absolute; inset: 0; }
.row-card h3 a:hover { color: var(--primary); }

/* Danh sách bài dạng ngang (trang chuyên mục) */
.post-list { display: flex; flex-direction: column; gap: 18px; }
.list-item { position: relative; display: grid; grid-template-columns: 300px minmax(0, 1fr); gap: 22px; background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 16px; transition: box-shadow .16s; }
.list-item:hover { box-shadow: var(--shadow-lg); }
.list-item .thumb { aspect-ratio: 16 / 10; border-radius: 12px; overflow: hidden; background: #DCE4EE; }
.list-item .thumb img { width: 100%; height: 100%; object-fit: cover; }
.list-item .body { display: flex; flex-direction: column; gap: 10px; padding: 6px 8px 6px 0; min-width: 0; }
.list-item h2 { font-size: 1.25rem; font-weight: 800; line-height: 1.32; }
.list-item h2 a { color: var(--ink); text-decoration: none; }
.list-item h2 a::after { content: ""; position: absolute; inset: 0; }
.list-item h2 a:hover { color: var(--primary); }
.list-item p { color: var(--muted); display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }

/* ---------- Tab theo nhóm ---------- */
.tabs { display: flex; gap: 8px; overflow-x: auto; padding-bottom: 6px; margin-bottom: 20px; scrollbar-width: thin; }
.tab { flex-shrink: 0; min-height: 44px; padding: 0 18px; border-radius: 999px; border: 1px solid var(--line); background: #fff; color: var(--ink); font-weight: 600; font-size: .92rem; display: inline-flex; align-items: center; gap: 8px; }
.tab:hover { border-color: var(--c, var(--primary)); color: var(--c, var(--primary)); }
.tab[aria-selected="true"] { background: var(--c, var(--primary)); border-color: var(--c, var(--primary)); color: #fff; }
.tab-panel[hidden] { display: none; }
.empty { background: #fff; border: 1px dashed var(--line); border-radius: var(--radius); padding: 40px; text-align: center; color: var(--muted); }

/* ---------- Hướng dẫn thực hành ---------- */
.guide { background: #fff; border: 1px solid var(--line); border-radius: 24px; padding: 40px; }
.steps { list-style: none; margin: 28px 0 0; padding: 0; display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 16px; counter-reset: st; position: relative; }
.steps li { position: relative; background: var(--bg); border-radius: 16px; padding: 22px; display: flex; flex-direction: column; gap: 8px; }
.steps li::before { counter-increment: st; content: counter(st); width: 44px; height: 44px; border-radius: 50%; background: var(--primary); color: #fff; font-weight: 800; font-size: 1.1rem; display: flex; align-items: center; justify-content: center; box-shadow: 0 0 0 6px var(--primary-soft); margin-bottom: 6px; }
.steps .t { font-weight: 800; font-size: 1.08rem; color: var(--ink); }
.steps .d { font-size: .94rem; color: var(--muted); }
.guide-foot { margin-top: 26px; display: flex; flex-wrap: wrap; gap: 12px; align-items: center; justify-content: space-between; padding-top: 22px; border-top: 1px solid var(--line-soft); }
.guide-links { display: flex; flex-wrap: wrap; gap: 8px 18px; }
.guide-links a { font-weight: 600; text-decoration: none; display: inline-flex; gap: 6px; align-items: center; }

/* ---------- Thư viện, liên kết ---------- */
.split { display: grid; grid-template-columns: minmax(0, 1.7fr) minmax(0, 1fr); gap: 28px; align-items: start; }
.filter-pills { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 16px; }
.pill { min-height: 42px; padding: 0 16px; border-radius: 999px; border: 1px solid #B8C2CF; background: #fff; color: var(--ink); font-weight: 600; font-size: .92rem; text-decoration: none; display: inline-flex; align-items: center; gap: 6px; }
.pill:hover { border-color: var(--primary); color: var(--primary); }
.pill.active { background: var(--primary); border-color: var(--primary); color: #fff; }
.pill .n { font-size: .75rem; opacity: .75; }
.lib-list { list-style: none; margin: 0; padding: 0; background: #fff; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.lib-item { display: flex; align-items: center; gap: 16px; padding: 16px 20px; border-bottom: 1px solid var(--line-soft); }
.lib-item:last-child { border-bottom: 0; }
.lib-item:hover { background: #FAFBFC; }
.lib-icon { width: 44px; height: 44px; border-radius: 12px; display: flex; align-items: center; justify-content: center; flex-shrink: 0; }
.lib-icon.pdf { background: #FDE8E8; color: #B42318; }
.lib-icon.video { background: #FDE8CC; color: #7A3E00; }
.lib-icon.img { background: #E3F1EA; color: #1E5B3A; }
.lib-icon.doc { background: #E6EEF7; color: #0F4C81; }
.lib-icon.link { background: #EEEAF8; color: #3E3A8C; }
.lib-main { flex: 1; min-width: 0; }
.lib-title { font-weight: 700; color: var(--ink); }
.lib-sub { font-size: .84rem; color: var(--subtle); display: flex; flex-wrap: wrap; gap: 4px 12px; margin-top: 2px; }
.lib-action { font-weight: 700; text-decoration: none; display: inline-flex; align-items: center; gap: 6px; white-space: nowrap; min-height: 40px; padding: 0 14px; border-radius: 10px; background: var(--primary-soft); }
.lib-action:hover { background: var(--primary); color: #fff; }

.side-box { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.side-box + .side-box { margin-top: 18px; }
.side-box-head { padding: 16px 20px; border-bottom: 1px solid var(--line-soft); font-weight: 800; font-size: 1.05rem; color: var(--ink); display: flex; align-items: center; gap: 10px; }
.side-box-head::before { content: ""; width: 4px; height: 20px; border-radius: 2px; background: var(--accent); }
.link-list a { display: flex; align-items: center; gap: 12px; padding: 13px 20px; text-decoration: none; color: var(--ink); font-weight: 600; border-bottom: 1px solid var(--line-soft); }
.link-list a:last-child { border-bottom: 0; }
.link-list a:hover { background: var(--primary-soft); color: var(--primary); }
.link-list .ic-wrap { width: 34px; height: 34px; border-radius: 9px; background: var(--primary-soft); color: var(--primary); display: flex; align-items: center; justify-content: center; flex-shrink: 0; }
.link-list small { display: block; font-weight: 400; color: var(--subtle); font-size: .8rem; }
.contact-card { background: var(--navy); color: #D5DEE9; border-radius: var(--radius); padding: 24px; display: flex; flex-direction: column; gap: 10px; position: relative; overflow: hidden; }
.contact-card::after { content: ""; position: absolute; right: -40px; top: -40px; width: 140px; height: 140px; border-radius: 50%; background: rgba(255,255,255,.06); }
.contact-card .t { font-weight: 800; font-size: 1.15rem; color: #fff; }
.contact-card .row { display: flex; gap: 10px; align-items: flex-start; font-size: .95rem; }
.contact-card a { color: #fff; }
.contact-card .ic { margin-top: 3px; color: var(--accent); }

/* ---------- Trang chuyên mục ---------- */
.cat-hero { --c: var(--primary); background: var(--c); color: #fff; border-radius: 24px; padding: 40px; position: relative; overflow: hidden; isolation: isolate; display: flex; gap: 28px; align-items: center; }
.cat-hero::before { content: ""; position: absolute; inset: 0; z-index: -1; background: radial-gradient(rgba(255,255,255,.12) 1.2px, transparent 1.2px) 0 0 / 22px 22px, linear-gradient(120deg, rgba(255,255,255,.08), rgba(0,0,0,.18)); }
.cat-hero-icon { width: 88px; height: 88px; border-radius: 22px; background: rgba(255,255,255,.14); display: flex; align-items: center; justify-content: center; flex-shrink: 0; }
.cat-hero h1 { color: #fff; font-size: clamp(1.7rem, 3.4vw, 2.4rem); font-weight: 800; }
.cat-hero p { color: rgba(255,255,255,.88); margin-top: 8px; max-width: 760px; font-size: 1.05rem; }
.cat-hero .code { font-weight: 800; letter-spacing: .1em; font-size: .8rem; color: rgba(255,255,255,.75); }
.cat-switch { display: flex; gap: 8px; overflow-x: auto; padding: 18px 0 2px; scrollbar-width: thin; }
.cat-switch a { --c: var(--primary); flex-shrink: 0; display: inline-flex; align-items: center; gap: 8px; min-height: 42px; padding: 0 14px; border-radius: 999px; background: #fff; border: 1px solid var(--line); text-decoration: none; color: var(--ink); font-weight: 600; font-size: .88rem; }
.cat-switch a:hover { border-color: var(--c); color: var(--c); }
.cat-switch a[aria-current="page"] { background: var(--c); border-color: var(--c); color: #fff; }

.layout { display: grid; grid-template-columns: minmax(0, 1fr) 340px; gap: 32px; align-items: start; padding-top: 28px; }
.sidebar { display: flex; flex-direction: column; gap: 18px; position: sticky; top: 100px; }
.sidebar .side-box + .side-box { margin-top: 0; }
.mini-list { list-style: none; margin: 0; padding: 6px 0; counter-reset: mn; }
.mini-list li { position: relative; display: flex; gap: 12px; padding: 12px 20px; }
.mini-list li + li { border-top: 1px solid var(--line-soft); }
.mini-list.numbered li::before { counter-increment: mn; content: counter(mn, decimal-leading-zero); font-weight: 800; font-size: 1.15rem; color: var(--line); min-width: 28px; line-height: 1.3; }
.mini-list a { color: var(--ink); text-decoration: none; font-weight: 600; font-size: .93rem; line-height: 1.42; }
.mini-list a::after { content: ""; position: absolute; inset: 0; }
.mini-list a:hover { color: var(--primary); }
.mini-list .meta { margin-top: 4px; font-size: .76rem; }
.mini-thumb { width: 76px; height: 56px; flex-shrink: 0; border-radius: 8px; overflow: hidden; background: #DCE4EE; }
.mini-thumb img { width: 100%; height: 100%; object-fit: cover; }
.cat-menu a { --c: var(--primary); display: flex; align-items: center; gap: 12px; padding: 11px 20px; text-decoration: none; color: var(--ink); font-weight: 600; font-size: .93rem; border-bottom: 1px solid var(--line-soft); }
.cat-menu a:last-child { border-bottom: 0; }
.cat-menu a:hover, .cat-menu a[aria-current="page"] { background: var(--bg); color: var(--c); }
.cat-menu .dot { width: 30px; height: 30px; border-radius: 8px; background: var(--c); color: #fff; display: flex; align-items: center; justify-content: center; flex-shrink: 0; }
.cat-menu .n { margin-left: auto; font-size: .78rem; color: var(--subtle); background: var(--bg); padding: 2px 8px; border-radius: 999px; }
.tag-cloud { display: flex; flex-wrap: wrap; gap: 8px; padding: 16px 20px; }
.tag { display: inline-flex; align-items: center; min-height: 32px; padding: 0 12px; border-radius: 999px; background: var(--bg); border: 1px solid var(--line); color: var(--ink); font-size: .85rem; font-weight: 600; text-decoration: none; }
.tag:hover { background: var(--primary); border-color: var(--primary); color: #fff; }

.pager { display: flex; flex-wrap: wrap; justify-content: center; gap: 6px; margin-top: 32px; }
.pager a, .pager span { min-width: 44px; height: 44px; display: inline-flex; align-items: center; justify-content: center; padding: 0 12px; border-radius: 10px; border: 1px solid var(--line); background: #fff; color: var(--ink); text-decoration: none; font-weight: 700; }
.pager a:hover { border-color: var(--primary); color: var(--primary); }
.pager .current { background: var(--primary); border-color: var(--primary); color: #fff; }
.pager .gap { border: 0; background: transparent; }

/* ---------- Trang bài viết ---------- */
.reading-progress { position: fixed; top: 0; left: 0; height: 3px; width: 0; background: var(--accent); z-index: 60; transition: width .08s linear; }
.preview-bar { background: #FFF4E5; border-bottom: 1px solid var(--warn-line); color: var(--warn-ink); font-weight: 600; font-size: .92rem; }
.preview-bar .container { display: flex; gap: 12px; align-items: center; justify-content: space-between; min-height: 48px; flex-wrap: wrap; }
.article { background: #fff; border: 1px solid var(--line); border-radius: 22px; padding: 44px 52px; }
.article-head { display: flex; flex-direction: column; gap: 16px; }
.article-head .chips { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.article h1.title { font-size: clamp(1.75rem, 3.4vw, 2.45rem); font-weight: 800; line-height: 1.22; letter-spacing: -.01em; }
.article .sapo { font-size: 1.16rem; font-weight: 600; color: #2A3A50; line-height: 1.65; }
.byline { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: 14px; padding: 16px 0; border-top: 1px solid var(--line-soft); border-bottom: 1px solid var(--line-soft); }
.author { display: flex; align-items: center; gap: 12px; }
.avatar { width: 44px; height: 44px; border-radius: 50%; background: var(--primary); color: #fff; font-weight: 800; display: flex; align-items: center; justify-content: center; font-size: 1rem; }
.author .name { font-weight: 700; color: var(--ink); font-size: .95rem; }
.tools { display: flex; flex-wrap: wrap; gap: 6px; }
.tool { height: 40px; min-width: 40px; padding: 0 12px; display: inline-flex; align-items: center; justify-content: center; gap: 6px; border-radius: 10px; border: 1px solid var(--line); background: #fff; color: var(--ink); font-size: .86rem; font-weight: 600; text-decoration: none; }
.tool:hover { border-color: var(--primary); color: var(--primary); background: var(--primary-soft); }
.tool.fb:hover { background: #1877F2; border-color: #1877F2; color: #fff; }
.tool.zalo:hover { background: #0068FF; border-color: #0068FF; color: #fff; }
.tool[aria-pressed="true"] { background: var(--primary); border-color: var(--primary); color: #fff; }
.cover { margin: 26px 0 0; }
.cover img { width: 100%; border-radius: 16px; aspect-ratio: 16 / 9; object-fit: cover; background: #DCE4EE; }
.cover figcaption { font-size: .88rem; color: var(--subtle); text-align: center; margin-top: 10px; font-style: italic; }
.toc { margin: 28px 0 0; background: var(--bg); border: 1px solid var(--line); border-radius: 14px; padding: 4px 0; }
.toc summary { list-style: none; cursor: pointer; padding: 14px 20px; font-weight: 800; color: var(--ink); display: flex; align-items: center; gap: 10px; }
.toc summary::-webkit-details-marker { display: none; }
.toc summary .chev { margin-left: auto; transition: transform .2s; }
.toc[open] summary .chev { transform: rotate(180deg); }
.toc ol { margin: 0; padding: 0 20px 16px 20px; list-style: none; display: flex; flex-direction: column; gap: 2px; }
.toc li { position: relative; padding-left: 18px; }
.toc li::before { content: ""; position: absolute; left: 2px; top: .7em; width: 7px; height: 7px; border-radius: 2px; background: var(--accent); }
.toc li.l3 { margin-left: 18px; font-size: .94rem; }
.toc li.l3::before { background: var(--line); border-radius: 50%; }
.toc a { color: var(--text); text-decoration: none; }
.toc a:hover, .toc a.active { color: var(--primary); text-decoration: underline; }

/* Nội dung bài viết */
.prose { margin-top: 28px; font-size: 1.1rem; line-height: 1.8; color: #1C2838; overflow-wrap: break-word; }
.prose > * + * { margin-top: 1.1em; }
.prose h2 { font-size: 1.55rem; font-weight: 800; margin-top: 1.9em; padding-top: .2em; }
.prose h3 { font-size: 1.28rem; font-weight: 800; margin-top: 1.6em; }
.prose h4 { font-size: 1.1rem; font-weight: 800; margin-top: 1.4em; }
.prose h2 + *, .prose h3 + *, .prose h4 + * { margin-top: .6em; }
.prose a { color: var(--primary); font-weight: 600; }
.prose strong { color: var(--ink); }
.prose mark { background: #FFF1B8; padding: 0 .15em; border-radius: 3px; }
.prose ul, .prose ol { padding-left: 1.5em; }
.prose li + li { margin-top: .4em; }
.prose li > p { margin: 0; }
.prose ul li::marker { color: var(--primary); }
.prose blockquote { margin-left: 0; margin-right: 0; padding: 20px 24px 20px 28px; border-left: 5px solid var(--accent); background: #FFFAF2; border-radius: 0 14px 14px 0; font-size: 1.12rem; font-style: italic; color: #3B2A10; }
.prose hr { border: 0; height: 1px; background: var(--line); margin: 2.2em 0; }
.prose img { border-radius: 12px; margin: 0 auto; }
.prose figure { margin-left: 0; margin-right: 0; }
.prose figure figcaption { font-size: .9rem; color: var(--subtle); text-align: center; margin-top: 10px; font-style: italic; line-height: 1.5; }
.prose figure[data-size="medium"] { max-width: 70%; margin-left: auto; margin-right: auto; }
.prose figure[data-size="small"] { max-width: 45%; margin-left: auto; margin-right: auto; }
.prose figure[data-align="left"] { float: left; max-width: 45%; margin: .3em 1.4em 1em 0; }
.prose figure[data-align="right"] { float: right; max-width: 45%; margin: .3em 0 1em 1.4em; }
.prose::after { content: ""; display: table; clear: both; }
.prose video { width: 100%; border-radius: 12px; background: #000; }
.prose .embed { position: relative; aspect-ratio: 16 / 9; border-radius: 12px; overflow: hidden; background: #000; }
.prose .embed iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }
.prose audio { width: 100%; }
.prose .table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: 12px; }
.prose table { width: 100%; border-collapse: collapse; font-size: .98rem; }
.prose th, .prose td { border-bottom: 1px solid var(--line-soft); border-right: 1px solid var(--line-soft); padding: 12px 14px; text-align: left; vertical-align: top; }
.prose th { background: var(--primary-soft); color: var(--ink); font-weight: 700; }
.prose tr:last-child td { border-bottom: 0; }
.prose th:last-child, .prose td:last-child { border-right: 0; }
.prose td p, .prose th p { margin: 0; }
.prose code { background: var(--bg); padding: .1em .4em; border-radius: 5px; font-size: .92em; }
.prose pre { background: var(--navy); color: #E6EEF7; padding: 18px; border-radius: 12px; overflow-x: auto; }
.prose pre code { background: transparent; padding: 0; }
/* Danh sách bước */
.prose ol[data-style="steps"] { list-style: none; padding: 0; counter-reset: s; display: flex; flex-direction: column; gap: 12px; }
.prose ol[data-style="steps"] > li { counter-increment: s; position: relative; padding: 16px 18px 16px 70px; background: var(--bg); border-radius: 14px; min-height: 64px; display: flex; align-items: center; margin: 0; }
.prose ol[data-style="steps"] > li::before { content: counter(s); position: absolute; left: 16px; top: 50%; transform: translateY(-50%); width: 38px; height: 38px; border-radius: 50%; background: var(--primary); color: #fff; font-weight: 800; display: flex; align-items: center; justify-content: center; font-size: 1rem; }
/* Hộp ghi chú */
.prose .callout { --cb: #E6EEF7; --cl: #0F4C81; --ct: #0B2545; border-radius: 14px; padding: 18px 20px 18px 62px; background: var(--cb); border-left: 4px solid var(--cl); color: var(--ct); position: relative; font-size: 1.02rem; }
.prose .callout > * + * { margin-top: .5em; }
.prose .callout::before { content: ""; position: absolute; left: 20px; top: 20px; width: 26px; height: 26px; background: var(--cl); -webkit-mask: var(--ci) center / contain no-repeat; mask: var(--ci) center / contain no-repeat; }
.prose .callout strong { color: inherit; }
.prose .callout[data-type="info"] { --ci: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='2' stroke-linecap='round'%3E%3Ccircle cx='12' cy='12' r='10'/%3E%3Cline x1='12' y1='16' x2='12' y2='12'/%3E%3Cline x1='12' y1='8' x2='12.01' y2='8'/%3E%3C/svg%3E"); }
.prose .callout[data-type="tip"] { --cb: #E8F5EE; --cl: #1E7A4C; --ct: #11402A; --ci: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M9 18h6'/%3E%3Cpath d='M10 22h4'/%3E%3Cpath d='M12 2a7 7 0 0 0-4 12.7V17h8v-2.3A7 7 0 0 0 12 2z'/%3E%3C/svg%3E"); }
.prose .callout[data-type="warning"] { --cb: #FFF4E5; --cl: #B45309; --ct: #5C2E00; --ci: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M10.3 3.9L1.8 18a2 2 0 0 0 1.7 3h17a2 2 0 0 0 1.7-3L13.7 3.9a2 2 0 0 0-3.4 0z'/%3E%3Cline x1='12' y1='9' x2='12' y2='13'/%3E%3Cline x1='12' y1='17' x2='12.01' y2='17'/%3E%3C/svg%3E"); }
.prose .callout[data-type="danger"] { --cb: #FDECEC; --cl: #B42318; --ct: #5E120C; --ci: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M12 22s8-4 8-10V5l-8-3-8 3v7c0 6 8 10 8 10z'/%3E%3Cline x1='12' y1='8' x2='12' y2='12'/%3E%3Cline x1='12' y1='16' x2='12.01' y2='16'/%3E%3C/svg%3E"); }
/* Thẻ tệp đính kèm trong bài */
.prose .file-card, .attach-item { display: flex; align-items: center; gap: 14px; padding: 14px 16px; border: 1px solid var(--line); border-radius: 14px; background: #fff; text-decoration: none; color: var(--ink); font-weight: 400; transition: border-color .15s, box-shadow .15s; }
.prose .file-card:hover, .attach-item:hover { border-color: var(--primary); box-shadow: var(--shadow); color: var(--ink); }
.file-ext { width: 46px; height: 52px; border-radius: 8px; background: var(--primary); color: #fff; display: flex; align-items: flex-end; justify-content: center; padding-bottom: 8px; font-size: .68rem; font-weight: 800; letter-spacing: .04em; flex-shrink: 0; position: relative; text-transform: uppercase; }
.file-ext::before { content: ""; position: absolute; right: 0; top: 0; border-style: solid; border-width: 0 12px 12px 0; border-color: transparent var(--bg) rgba(255,255,255,.35) transparent; }
.file-ext[data-ext="pdf"] { background: #D92D20; }
.file-ext[data-ext="doc"], .file-ext[data-ext="docx"], .file-ext[data-ext="odt"] { background: #2B579A; }
.file-ext[data-ext="xls"], .file-ext[data-ext="xlsx"], .file-ext[data-ext="ods"], .file-ext[data-ext="csv"] { background: #217346; }
.file-ext[data-ext="ppt"], .file-ext[data-ext="pptx"] { background: #C43E1C; }
.file-ext[data-ext="zip"], .file-ext[data-ext="rar"] { background: #6B4E16; }
.file-info { flex: 1; min-width: 0; }
.file-name { font-weight: 700; display: block; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.file-size { font-size: .82rem; color: var(--subtle); }
.file-dl { display: inline-flex; align-items: center; gap: 6px; font-weight: 700; color: var(--primary); font-size: .9rem; white-space: nowrap; }

.attachments { margin-top: 36px; }
.attachments h2 { font-size: 1.15rem; font-weight: 800; margin-bottom: 14px; display: flex; gap: 10px; align-items: center; }
.attach-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
.article-foot { margin-top: 36px; padding-top: 24px; border-top: 1px solid var(--line-soft); display: flex; flex-direction: column; gap: 18px; }
.source { font-size: .95rem; color: var(--muted); }
.source b { color: var(--ink); }
.tags-row { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.tags-row .label { font-weight: 700; color: var(--ink); margin-right: 4px; display: inline-flex; gap: 6px; align-items: center; }
.share-row { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px; align-items: center; }
.reminder { margin-top: 28px; display: flex; gap: 14px; align-items: flex-start; background: var(--warn-bg); border: 1px solid var(--warn-line); border-radius: 14px; padding: 16px 18px; color: #5C2E00; font-size: .95rem; }
.reminder .ic { color: var(--warn-ink); margin-top: 2px; }
.post-nav { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin-top: 22px; }
.post-nav a { position: relative; display: flex; flex-direction: column; gap: 6px; background: #fff; border: 1px solid var(--line); border-radius: 14px; padding: 16px 20px; text-decoration: none; color: var(--ink); font-weight: 700; line-height: 1.4; }
.post-nav a:hover { border-color: var(--primary); color: var(--primary); box-shadow: var(--shadow); }
.post-nav small { font-size: .78rem; color: var(--subtle); font-weight: 600; display: inline-flex; gap: 4px; align-items: center; text-transform: uppercase; letter-spacing: .06em; }
.post-nav .next { text-align: right; align-items: flex-end; }
.related { margin-top: 48px; }
.qr-side { padding: 18px 20px; display: flex; gap: 14px; align-items: center; }
.qr-side img { width: 96px; height: 96px; border: 1px solid var(--line); border-radius: 8px; padding: 4px; image-rendering: pixelated; }
.qr-side p { font-size: .86rem; color: var(--muted); }
.qr-side a { font-size: .86rem; font-weight: 700; }

/* ---------- Tìm kiếm ---------- */
.search-hero { background: #fff; border: 1px solid var(--line); border-radius: 20px; padding: 32px; }
.search-hero form { display: flex; gap: 10px; margin-top: 16px; flex-wrap: wrap; }
.search-hero select { min-height: 50px; border: 2px solid var(--line); border-radius: 12px; padding: 0 12px; font: inherit; background: #fff; color: var(--ink); }
.hl { background: #FFF1B8; border-radius: 3px; padding: 0 2px; }

/* ---------- Chân trang ---------- */
.site-footer { margin-top: 80px; background: var(--navy); color: #C9D5E4; font-size: .93rem; }
.footer-top { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 40px; padding: 48px 24px 36px; }
.site-footer h3 { color: #fff; font-size: 1rem; font-weight: 800; margin-bottom: 14px; }
.site-footer a { color: #E6EEF7; text-decoration: none; }
.site-footer a:hover { color: var(--accent); text-decoration: underline; }
.footer-brand { display: flex; gap: 14px; align-items: center; margin-bottom: 16px; }
.footer-brand .n { color: #fff; font-weight: 800; font-size: 1.05rem; line-height: 1.3; }
.footer-list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 9px; }
.footer-list li { display: flex; gap: 10px; align-items: flex-start; }
.footer-list .ic { margin-top: 3px; color: var(--accent); }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.1); }
.footer-bottom .container { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px; padding-top: 18px; padding-bottom: 18px; font-size: .84rem; color: #9FB0C6; }
.to-top { position: fixed; right: 18px; bottom: 18px; width: 48px; height: 48px; border-radius: 50%; border: 0; background: var(--primary); color: #fff; box-shadow: var(--shadow-lg); display: flex; align-items: center; justify-content: center; opacity: 0; visibility: hidden; transform: translateY(10px); transition: .2s; z-index: 40; }
.to-top.show { opacity: 1; visibility: visible; transform: none; }
.toast { position: fixed; left: 50%; bottom: 24px; transform: translateX(-50%) translateY(20px); background: var(--navy); color: #fff; padding: 12px 18px; border-radius: 12px; box-shadow: var(--shadow-lg); font-weight: 600; opacity: 0; transition: .2s; z-index: 200; pointer-events: none; }
.toast.show { opacity: 1; transform: translateX(-50%); }

.notfound { text-align: center; padding: 80px 24px; }
.notfound .code { font-size: 6rem; font-weight: 800; color: var(--line); line-height: 1; }
.notfound h1 { margin: 12px 0; }

/* ---------- Tương thích nhiều kích thước màn hình ---------- */
@media (max-width: 1100px) {
  .main-nav > a.hide-md { display: none; }
  .layout { grid-template-columns: minmax(0, 1fr) 300px; gap: 24px; }
  .post-grid.cols-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 960px) {
  .main-nav { display: none; }
  .menu-toggle { display: inline-flex; }
  .hero-card { grid-template-columns: 1fr; padding: 40px; }
  .qr-card { flex-direction: row; width: auto; align-self: flex-start; padding: 14px 18px; gap: 16px; }
  .qr-card img { width: 96px; height: 96px; }
  .qr-card .qr-text { display: flex; flex-direction: column; gap: 4px; align-items: flex-start; }
  .qr-card .qr-title, .qr-card .qr-sub { text-align: left; }
  .cat-grid, .post-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .news-layout, .split, .layout { grid-template-columns: minmax(0, 1fr); }
  .feature { min-height: 380px; }
  .steps { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .sidebar { position: static; }
  .footer-top { grid-template-columns: 1fr 1fr; }
  .footer-top > :first-child { grid-column: 1 / -1; }
  .article { padding: 32px; }
}
@media (max-width: 640px) {
  .container { padding: 0 16px; }
  .topbar .hide-sm { display: none; }
  .site-header .container { min-height: 66px; gap: 10px; }
  .brand-logo { width: 42px; height: 42px; }
  .brand-org { font-size: .6rem; letter-spacing: .02em; }
  .brand-name { font-size: 1rem; }
  .icon-btn { width: 42px; height: 42px; }
  .hero-card { padding: 28px 22px; border-radius: 20px; gap: 26px; }
  .hero p.lead { font-size: 1.02rem; }
  .hero-actions .btn { width: 100%; }
  .hero-stats { gap: 18px; }
  .qr-card { width: 100%; }
  .section { padding-top: 48px; }
  .cat-grid, .post-grid, .post-grid.cols-2, .post-grid.cols-4 { grid-template-columns: minmax(0, 1fr); gap: 14px; }
  .cat-card { padding: 20px; }
  .feature { min-height: 340px; }
  .feature-body { padding: 22px; }
  .row-card { grid-template-columns: 112px minmax(0, 1fr); gap: 12px; padding: 10px; }
  .list-item { grid-template-columns: 1fr; padding: 12px; gap: 14px; }
  .list-item .body { padding: 0 6px 6px; }
  .guide { padding: 26px 20px; border-radius: 20px; }
  .steps { grid-template-columns: 1fr; }
  .steps li { flex-direction: row; align-items: flex-start; flex-wrap: wrap; gap: 4px 14px; }
  .steps li::before { margin: 0; }
  .steps li .txt { flex: 1; min-width: 0; }
  .lib-item { flex-wrap: wrap; padding: 14px 16px; }
  .lib-action { margin-left: 60px; }
  .cat-hero { flex-direction: column; align-items: flex-start; padding: 26px 22px; gap: 16px; border-radius: 20px; }
  .cat-hero-icon { width: 64px; height: 64px; border-radius: 16px; }
  .article { padding: 22px 18px; border-radius: 18px; border-left: 0; border-right: 0; margin: 0 -16px; border-radius: 0; }
  .prose { font-size: 1.06rem; }
  .prose figure[data-size], .prose figure[data-align] { float: none; max-width: 100%; margin-left: 0; margin-right: 0; }
  .prose ol[data-style="steps"] > li { padding: 14px 14px 14px 62px; }
  .attach-grid, .post-nav { grid-template-columns: minmax(0, 1fr); }
  .post-nav .next { text-align: left; align-items: flex-start; }
  .byline { flex-direction: column; align-items: flex-start; }
  .footer-top { grid-template-columns: 1fr; gap: 28px; padding: 36px 16px 28px; }
  .search-hero { padding: 22px 18px; }
}

/* ---------- In bài viết ---------- */
@media print {
  .topbar, .site-header, .site-footer, .sidebar, .tools, .related, .post-nav, .breadcrumb, .to-top, .share-row, .reminder, .toc, .reading-progress, .preview-bar { display: none !important; }
  body { background: #fff; }
  .layout { display: block; padding: 0; }
  .article { border: 0; padding: 0; }
  .prose { font-size: 12pt; }
  a { color: #000; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition: none !important; animation: none !important; scroll-behavior: auto !important; }
}
.prose figcaption:empty, .cover figcaption:empty { display: none; }
.prose p:empty { display: none; }