/* ===== Trung tâm hỗ trợ — Design tokens ===== */
:root{
  --ink:#183247;          /* ⇐ CHỈ đổi màu chữ theo base.vn */
  /* accent = navy chủ đạo (giữ nguyên theme cũ) */
  --teal:#1E57A0;
  --teal-600:#14417E;
  --teal-700:#0E2F5F;
  --teal-050:#E9EFF7;
  --teal-100:#D4E1F0;
  --amber:#E1953B;
  --amber-050:#FBF0DF;
  --surface:#FFFFFF;      /* ⇐ nền trang trắng */
  --soft:#F3F6FA;         /* nền phụ nhạt cho tag/hover */
  --card:#FFFFFF;
  --border:#E4EBE9;
  --border-2:#D6E0DD;
  --muted:#5A6B7B;        /* text phụ — cùng tông #183247 */
  --muted-2:#8A98A6;
  --radius:14px;
  --radius-sm:10px;
  --shadow-sm:0 1px 2px rgba(21,33,31,.06),0 1px 3px rgba(21,33,31,.04);
  --shadow-md:0 12px 28px -14px rgba(11,102,112,.35);
  --maxw:1180px;
  /* ⇐ CHỈ đổi font theo base.vn */
  --ff-display:"Source Sans 3","Source Sans Pro",system-ui,sans-serif;
  --ff-body:"Source Sans 3","Source Sans Pro",system-ui,sans-serif;
  /* group palette (khớp subsystems.js / màn chọn phân hệ) */
  --g-hr:#2E71C3;    --g-hr-050:#E9F1FB;
  --g-office:#1E8A63;--g-office-050:#E6F4EE;
  --g-supply:#DD8A2A;--g-supply-050:#FBF1E2;
  --g-biz:#7C5CC4;   --g-biz-050:#F0EBFA;
  --g-core:#4A5B6E;  --g-core-050:#EBEEF1;
  /* brand navy — đồng nhất màn chọn phân hệ (GIỮ NGUYÊN) */
  --navy-1:#1E57A0; --navy-2:#14417E; --navy-3:#0E2F5F; --navy-4:#0A1C3D;
  --brand:#1E57A0; --brand-deep:#0A1C3D; --brand-header:#0E2F5F; --link:#2753D7;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  font-family:var(--ff-body);
  background:var(--surface);
  color:var(--ink);
  font-size:14.5px;
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}
.container{max-width:var(--maxw);margin:0 auto;padding:0 24px}
.h-display{font-family:var(--ff-display)}

/* ===== Top bar (trong suốt, đặc navy khi cuộn) ===== */
.topbar{
  background:transparent;
  position:fixed;top:0;left:0;right:0;z-index:50;
  transition:background .28s ease, box-shadow .28s ease;
}
.topbar.scrolled{background:var(--brand-header);box-shadow:0 4px 20px -8px rgba(4,14,32,.65)}
.topbar .container{display:flex;align-items:center;gap:26px;height:64px}
.brand{display:flex;align-items:center;gap:11px;font-family:var(--ff-display);font-weight:800;font-size:18px;letter-spacing:-.2px;color:#fff}
.brand .logo{
  width:36px;height:36px;border-radius:10px;
  background:rgba(255,255,255,.16);border:1px solid rgba(255,255,255,.28);
  display:grid;place-items:center;color:#fff;flex:none;
}
.brand small{display:block;font-family:var(--ff-body);font-weight:500;font-size:11px;color:rgba(255,255,255,.72);letter-spacing:0}
.brand .logo-chip{background:#fff;border-radius:9px;padding:6px 10px;display:flex;align-items:center;flex:none;box-shadow:0 4px 12px -6px rgba(0,0,0,.4)}
.brand .logo-chip img{height:24px;display:block}
.brand .divider{width:1px;height:26px;background:rgba(255,255,255,.28);flex:none}
.topnav{display:flex;align-items:center;gap:2px;margin-left:6px}
.topnav a{
  font-size:14px;font-weight:600;color:rgba(255,255,255,.82);white-space:nowrap;
  padding:8px 12px;border-radius:8px;transition:.15s;display:inline-flex;align-items:center;gap:7px;
}
.brand .brand-name{font-family:var(--ff-display);font-weight:800;font-size:16px;color:#fff;white-space:nowrap;letter-spacing:-.2px}
.topnav a:hover{color:#fff;background:rgba(255,255,255,.12)}
.topnav a.active{color:#fff;background:rgba(255,255,255,.16)}
.topnav a .dotpill{width:6px;height:6px;border-radius:50%;background:var(--amber);display:inline-block}
.spacer{flex:1}
.btn-login{
  display:inline-flex;align-items:center;gap:8px;font-family:var(--ff-body);font-weight:600;font-size:13.5px;
  color:#fff;border:1px solid rgba(255,255,255,.42);padding:8px 16px;border-radius:9px;transition:.15s;white-space:nowrap;flex:none;
}
.btn-login:hover{background:#fff;color:var(--brand);border-color:#fff}
.btn{
  display:inline-flex;align-items:center;gap:8px;
  font-family:var(--ff-body);font-weight:600;font-size:14px;
  padding:9px 16px;border-radius:10px;border:1px solid transparent;cursor:pointer;
  transition:.15s;
}
.btn-primary{background:var(--teal);color:#fff}
.btn-primary:hover{background:var(--teal-600)}
.btn-ghost{background:transparent;color:var(--ink);border-color:var(--border-2)}
.btn-ghost:hover{background:var(--teal-050);border-color:var(--teal-100)}

/* ===== Hero (navy shell gradient + glow + wave — đồng nhất màn chọn phân hệ) ===== */
.hero{
  position:relative;overflow:hidden;color:#fff;
  background:radial-gradient(130% 100% at 50% 46%,var(--navy-1) 0%,var(--navy-2) 32%,var(--navy-3) 60%,var(--navy-4) 100%);
}
/* glow 4 màu nhóm (như system-shell__glow) */
.hero::before{content:"";position:absolute;inset:0;pointer-events:none;
  background:
    radial-gradient(38% 44% at 18% 16%,rgba(66,140,230,.40),transparent 70%),
    radial-gradient(40% 46% at 88% 14%,rgba(46,176,124,.30),transparent 70%),
    radial-gradient(42% 50% at 12% 92%,rgba(238,150,70,.24),transparent 70%),
    radial-gradient(46% 52% at 90% 96%,rgba(140,110,224,.32),transparent 70%);
}
.hero-wave{position:absolute;left:0;right:0;bottom:-1px;width:100%;height:120px;pointer-events:none;z-index:2}
.hero-ribbon{position:absolute;inset:0;width:100%;height:100%;pointer-events:none;z-index:1}
.hero .container{position:relative;z-index:2;padding:104px 24px 92px;display:grid;grid-template-columns:minmax(0,1.05fr) 430px;gap:40px;align-items:center}
.hero-copy{max-width:760px}
.hero h1{
  font-family:var(--ff-display);font-weight:800;letter-spacing:-.5px;white-space:nowrap;
  font-size:29px;line-height:1.2;margin:0 0 22px;
  text-shadow:0 2px 24px rgba(4,14,32,.35);
}
/* search — gọn, hiện đại, viền gradient + glow */
.search-wrap{position:relative;max-width:540px}
.search-wrap::before{content:"";position:absolute;inset:-2px;border-radius:999px;
  background:linear-gradient(120deg,#428CE6,#2EB07C 45%,#8C6EE0 90%);opacity:.9;filter:blur(0.5px)}
.search-wrap::after{content:"";position:absolute;inset:-14px;border-radius:999px;z-index:-1;
  background:radial-gradient(60% 100% at 50% 50%,rgba(66,140,230,.45),transparent 70%);filter:blur(10px)}
.searchbox{
  position:relative;display:flex;align-items:center;gap:8px;background:#fff;border-radius:999px;
  padding:5px 5px 5px 20px;box-shadow:0 14px 34px -14px rgba(6,20,45,.7);
}
.searchbox svg{color:var(--navy-1);flex:none}
.searchbox input{
  border:0;outline:0;flex:1;font-family:var(--ff-body);font-size:15px;color:var(--ink);padding:11px 0;background:transparent;
}
.searchbox input::placeholder{color:var(--muted-2)}
.btn-search{
  display:inline-flex;align-items:center;gap:7px;border:0;cursor:pointer;white-space:nowrap;
  font-family:var(--ff-body);font-weight:600;font-size:14px;color:#fff;
  background:linear-gradient(135deg,#2E71C3 0%,#1E57A0 100%);
  padding:11px 22px;border-radius:999px;transition:.15s;box-shadow:0 6px 14px -6px rgba(30,87,160,.8);
}
.btn-search:hover{filter:brightness(1.08);box-shadow:0 8px 18px -6px rgba(30,87,160,.9)}
.suggest{display:flex;align-items:center;gap:9px;flex-wrap:wrap;margin-top:16px}
.suggest span{font-size:13px;color:rgba(255,255,255,.72)}
.chip{
  font-size:13px;font-weight:500;color:#fff;background:rgba(255,255,255,.12);
  border:1px solid rgba(255,255,255,.22);padding:6px 13px;border-radius:999px;transition:.15s;backdrop-filter:blur(4px);
}
.chip:hover{background:rgba(255,255,255,.24)}
/* hero illustration */
.hero-art{position:relative;display:grid;place-items:center}
.hero-art svg{width:100%;max-width:440px;height:auto;overflow:visible}
.hero-art .float{animation:floaty 5s ease-in-out infinite}
.hero-art .float2{animation:floaty 6s ease-in-out infinite .8s}
@keyframes floaty{0%,100%{transform:translateY(0)}50%{transform:translateY(-8px)}}
@media(prefers-reduced-motion:reduce){.hero-art .float,.hero-art .float2{animation:none}}

/* ===== Section ===== */
.section{padding:56px 0}
.section-head{display:flex;align-items:flex-end;justify-content:space-between;margin-bottom:26px;gap:20px}
.eyebrow{
  font-family:var(--ff-display);font-size:12.5px;font-weight:700;letter-spacing:.14em;
  text-transform:uppercase;color:var(--brand);display:flex;align-items:center;gap:9px;margin-bottom:9px;
}
.eyebrow::before{content:"";width:22px;height:2px;background:var(--brand);border-radius:2px}
.section-head h2{font-family:var(--ff-display);font-weight:800;font-size:27px;letter-spacing:-.5px;margin:0}
.section-head .lead{color:var(--muted);font-size:15px;margin:6px 0 0}
.link-all{font-size:14px;font-weight:600;color:var(--brand);display:inline-flex;align-items:center;gap:6px;white-space:nowrap}
.link-all:hover{gap:9px}

/* ===== Group cards ===== */
.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.gcard{
  background:var(--card);border:1px solid var(--border);border-radius:var(--radius);
  padding:24px 22px;transition:.18s;position:relative;overflow:hidden;
}
.gcard{--gc:var(--teal);--gc-050:var(--teal-050)}
.gcard::before{content:"";position:absolute;left:0;top:0;bottom:0;width:3px;background:var(--gc);opacity:0;transition:.18s}
.gcard:hover{border-color:color-mix(in srgb,var(--gc) 35%,var(--border));box-shadow:var(--shadow-md);transform:translateY(-3px)}
.gcard:hover::before{opacity:1}
.gcard .ic{
  width:50px;height:50px;border-radius:13px;background:var(--gc-050);color:var(--gc);
  display:grid;place-items:center;margin-bottom:16px;
}
.gcard .arr{position:absolute}
.gcard:hover .arr{color:var(--gc)}
.gcard h3{font-family:var(--ff-display);font-weight:700;font-size:18px;margin:0 0 6px;letter-spacing:-.2px}
.gcard p{color:var(--muted);font-size:14px;margin:0 0 18px;min-height:42px}
.gcard .meta{display:flex;align-items:center;gap:14px;font-size:13px;color:var(--muted-2);font-weight:500;padding-top:14px;border-top:1px dashed var(--border-2)}
.gcard .meta b{color:var(--ink);font-weight:700}
.gcard .arr{position:absolute;top:24px;right:22px;color:var(--border-2);transition:.18s}
.gcard:hover .arr{color:var(--teal);transform:translate(2px,-2px)}

/* ===== Popular list ===== */
.two-col{display:grid;grid-template-columns:1.4fr 1fr;gap:40px}
.plist{display:flex;flex-direction:column}
.prow{
  display:flex;align-items:center;gap:15px;padding:15px 6px;border-bottom:1px solid var(--border);transition:.15s;
}
.prow:hover{background:var(--g-hr-050);border-radius:10px;border-color:transparent;padding-left:14px;padding-right:14px}
.prow .num{font-family:var(--ff-display);font-weight:800;font-size:15px;color:#C3D3EA;width:26px;flex:none;text-align:center}
.prow:hover .num{color:var(--brand)}
.prow .txt{flex:1}
.prow .txt .t{font-weight:600;font-size:15px}
.prow .txt .c{font-size:12.5px;color:var(--muted-2);margin-top:2px}
.badge{
  font-size:11.5px;font-weight:700;padding:3px 9px;border-radius:999px;display:inline-flex;align-items:center;gap:5px;
  font-family:var(--ff-body);letter-spacing:.01em;flex:none;
}
.badge.doc{background:var(--g-hr-050);color:var(--navy-1)}
.badge.video{background:#FDE7E6;color:#C4302B}
.aside-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:24px}
.aside-card h4{font-family:var(--ff-display);font-weight:700;font-size:16px;margin:0 0 4px}
.aside-card .muted{color:var(--muted);font-size:13.5px;margin:0 0 18px}
.tagcloud{display:flex;flex-wrap:wrap;gap:9px}
.tag{font-size:13px;font-weight:500;background:var(--soft);border:1px solid var(--border);padding:7px 13px;border-radius:9px;color:var(--muted)}
.tag:hover{border-color:#C3D3EA;color:var(--brand);background:var(--g-hr-050)}

/* ===== Footer ===== */
.footer{background:var(--ink);color:#cdd8d5;margin-top:20px}
.footer .container{padding:40px 24px;display:flex;justify-content:space-between;align-items:center;gap:20px;flex-wrap:wrap}
.footer .brand{color:#fff}
.footer .brand small{color:#8fa39e}
.footer .links{display:flex;gap:26px;font-size:14px}
.footer .links a:hover{color:#fff}

/* ===== Breadcrumb (signature spine) ===== */
.crumbbar{background:var(--card);border-bottom:1px solid var(--border)}
.crumb{display:flex;align-items:center;gap:0;flex-wrap:wrap;padding:15px 0;font-size:13.5px}
.crumb a,.crumb span.node{display:inline-flex;align-items:center;gap:8px;color:var(--muted);font-weight:500;position:relative}
.crumb .dot{width:7px;height:7px;border-radius:50%;background:var(--border-2);flex:none}
.crumb a:hover{color:var(--teal)}
.crumb a:hover .dot,.crumb .node.cur .dot{background:var(--teal)}
.crumb .sep{width:26px;height:1.5px;background:var(--border-2);margin:0 4px}
.crumb .node.cur{color:var(--ink);font-weight:600}

/* ===== Article layout ===== */
.artdoc{display:grid;grid-template-columns:262px minmax(0,1fr) 210px;gap:40px;align-items:start;padding:36px 0 60px}

/* left tree */
.rail{position:sticky;top:88px}
.rail .rail-title{font-family:var(--ff-display);font-size:12px;font-weight:700;letter-spacing:.13em;text-transform:uppercase;color:var(--muted-2);margin:0 0 14px;padding-left:2px}
.tree{list-style:none;margin:0;padding:0;position:relative}
.tree .subsys{font-weight:700;font-size:14.5px;font-family:var(--ff-display);display:flex;align-items:center;gap:9px;margin-bottom:10px}
.tree .subsys .si{width:26px;height:26px;border-radius:8px;background:var(--teal-050);color:var(--teal);display:grid;place-items:center;flex:none}
.tree .fn{margin:0 0 4px;padding-left:12px;border-left:2px solid var(--border);position:relative}
.tree .fn>.fn-name{font-size:13.5px;font-weight:600;color:var(--muted);padding:6px 0 6px 8px;display:block}
.tree .fn.open{border-color:var(--teal-100)}
.tree .fn.open>.fn-name{color:var(--ink)}
.tree .arts{list-style:none;margin:0 0 8px;padding:0 0 0 8px}
.tree .arts li{position:relative}
.tree .arts a{display:flex;align-items:center;gap:8px;font-size:13.5px;color:var(--muted);padding:6px 10px;border-radius:8px;margin:1px 0}
.tree .arts a:hover{background:var(--surface);color:var(--ink)}
.tree .arts a.active{background:var(--teal-050);color:var(--teal-700);font-weight:600}
.tree .arts a .lead-dot{width:5px;height:5px;border-radius:50%;background:var(--border-2);flex:none}
.tree .arts a.active .lead-dot{background:var(--teal)}

/* article body */
.article-head .badge{margin-bottom:14px}
.article-head h1{font-family:var(--ff-display);font-weight:800;font-size:33px;line-height:1.18;letter-spacing:-.6px;margin:0 0 14px}
.article-meta{display:flex;align-items:center;gap:18px;color:var(--muted-2);font-size:13.5px;padding-bottom:22px;margin-bottom:26px;border-bottom:1px solid var(--border);flex-wrap:wrap}
.article-meta .m{display:inline-flex;align-items:center;gap:7px}
.article-meta .who{display:inline-flex;align-items:center;gap:9px;color:var(--muted)}
.article-meta .who .av{width:26px;height:26px;border-radius:50%;background:linear-gradient(135deg,var(--teal),var(--teal-700));color:#fff;display:grid;place-items:center;font-size:11px;font-weight:700;font-family:var(--ff-display)}
.prose{font-size:16px;line-height:1.75;color:#183247}
.prose h2{font-family:var(--ff-display);font-weight:700;font-size:21px;letter-spacing:-.3px;margin:34px 0 12px;scroll-margin-top:90px}
.prose h2 .step{display:inline-grid;place-items:center;width:28px;height:28px;border-radius:8px;background:var(--teal);color:#fff;font-size:14px;margin-right:11px;vertical-align:2px}
.prose p{margin:0 0 14px}
.prose ul{margin:0 0 16px;padding-left:22px}
.prose li{margin:6px 0}
.prose strong{color:var(--ink);font-weight:700}
/* Ảnh/bảng/video chèn từ trình soạn thảo — CKEditor gắn width/height cứng nên phải ghi đè */
.prose img{max-width:100%!important;height:auto!important;border-radius:10px;border:1px solid var(--border);display:block;margin:18px 0}
.prose figure{max-width:100%!important;margin:18px 0}
.prose figure img{margin:0}
.prose figcaption{font-size:13px;color:var(--muted);text-align:center;margin-top:7px}
.prose iframe{max-width:100%;border-radius:10px;border:0}
.prose table{width:100%;border-collapse:collapse;margin:18px 0;font-size:14.5px;display:block;overflow-x:auto}
.prose table td,.prose table th{border:1px solid var(--border);padding:9px 12px;text-align:left}
.prose table th{background:var(--surface);font-weight:700}
.prose blockquote{margin:18px 0;padding:12px 18px;border-left:3px solid var(--brand);background:var(--surface);border-radius:0 10px 10px 0;color:var(--muted-2)}
.prose a{color:var(--link);text-decoration:underline;text-underline-offset:2px}
.prose pre{overflow-x:auto;background:var(--surface);border:1px solid var(--border);border-radius:10px;padding:14px}
.callout{
  display:flex;gap:13px;background:var(--amber-050);border:1px solid #f0dcbc;border-left:3px solid var(--amber);
  border-radius:10px;padding:15px 17px;margin:20px 0;font-size:14.5px;color:#6b4e22;
}
.callout svg{flex:none;color:var(--amber);margin-top:2px}
.shot{border:1px solid var(--border);border-radius:12px;overflow:hidden;margin:18px 0;background:var(--surface)}
.shot .bar{height:34px;background:linear-gradient(var(--card),var(--surface));border-bottom:1px solid var(--border);display:flex;align-items:center;gap:6px;padding:0 13px}
.shot .bar i{width:10px;height:10px;border-radius:50%;background:var(--border-2);display:inline-block}
.shot .body{padding:22px;color:var(--muted-2);font-size:13.5px;text-align:center;min-height:120px;display:grid;place-items:center}

/* helpful box */
.helpful{
  margin:38px 0 0;background:var(--card);border:1px solid var(--border);border-radius:var(--radius);
  padding:22px 24px;display:flex;align-items:center;justify-content:space-between;gap:20px;flex-wrap:wrap;
}
.helpful .q{font-family:var(--ff-display);font-weight:700;font-size:16px}
.helpful .q small{display:block;font-family:var(--ff-body);font-weight:400;font-size:13px;color:var(--muted);margin-top:3px}
.helpful .acts{display:flex;gap:10px}
.vote{display:inline-flex;align-items:center;gap:8px;font-weight:600;font-size:14px;padding:9px 16px;border-radius:10px;border:1px solid var(--border-2);background:#fff;cursor:pointer;transition:.15s}
.vote:hover{border-color:var(--teal);color:var(--teal);background:var(--teal-050)}
.vote.no:hover{border-color:#d98a8a;color:#c0564f;background:#fdf0ef}

/* related */
.related{margin-top:40px}
.related h3{font-family:var(--ff-display);font-weight:700;font-size:18px;margin:0 0 16px}
.rgrid{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.rcard{border:1px solid var(--border);border-radius:12px;padding:16px 17px;background:#fff;transition:.15s;display:flex;gap:12px;align-items:flex-start}
.rcard:hover{border-color:var(--teal-100);box-shadow:var(--shadow-md)}
.rcard .ri{width:34px;height:34px;border-radius:9px;flex:none;display:grid;place-items:center;background:var(--teal-050);color:var(--teal)}
.rcard.v .ri{background:#FDE7E6;color:#C4302B}
.rcard .rt{font-weight:600;font-size:14.5px;line-height:1.35}
.rcard .rc{font-size:12.5px;color:var(--muted-2);margin-top:3px}

/* TOC */
.toc{position:sticky;top:88px}
.toc .toc-title{font-family:var(--ff-display);font-size:12px;font-weight:700;letter-spacing:.13em;text-transform:uppercase;color:var(--muted-2);margin:0 0 14px}
.toc ul{list-style:none;margin:0;padding:0;border-left:2px solid var(--border)}
.toc li a{display:block;font-size:13px;color:var(--muted);padding:6px 0 6px 15px;margin-left:-2px;border-left:2px solid transparent;line-height:1.4}
.toc li a:hover{color:var(--ink)}
.toc li a.active{color:var(--teal-700);font-weight:600;border-left-color:var(--teal)}

/* ===== base.vn-style centered section title ===== */
.sectitle{text-align:center;margin:0 0 34px}
.sectitle h2{font-family:var(--ff-display);font-weight:800;font-size:20px;letter-spacing:.12em;text-transform:uppercase;color:var(--navy-3);margin:0 0 12px}
.sectitle .u{width:46px;height:3px;background:var(--brand);border-radius:3px;margin:0 auto}
.sectitle p{color:var(--muted-2);font-size:14.5px;margin:14px auto 0;max-width:56ch}

/* ===== Directory (nhóm phân hệ → phân hệ blocks, 2 cột) ===== */
.dirgroup{margin-bottom:36px}
.dirgroup-head{display:flex;align-items:center;gap:13px;margin:0 0 16px}
.dirgroup-head .gi{width:36px;height:36px;border-radius:10px;display:grid;place-items:center;color:#fff;flex:none;box-shadow:0 6px 14px -7px var(--gc)}
.dirgroup-head h3{font-family:var(--ff-display);font-weight:800;font-size:18px;margin:0;letter-spacing:-.2px}
.dirgroup-head .cnt{font-size:12px;color:var(--muted);font-weight:600;background:color-mix(in srgb,var(--gc) 12%,#fff);padding:3px 11px;border-radius:999px}
.dirgroup-head .rule{flex:1;height:1px;background:var(--border)}
.dir2{display:grid;grid-template-columns:1fr 1fr;gap:16px}
/* khối card như cũ + 1 nền xám nhạt đồng nhất (giống base) */
.phblock{--gc:var(--brand);--gc-050:var(--teal-050);border:1px solid var(--border);border-radius:12px;padding:18px 20px 16px;
  background:#F5F7FA;transition:.16s}
.phblock:hover{border-color:var(--border-2);box-shadow:var(--shadow-md)}
.phblock .ph-head{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:10px;padding-bottom:11px;border-bottom:1px solid var(--border)}
.phblock .ph-name{font-family:var(--ff-display);font-weight:700;font-size:15.5px;display:flex;align-items:center;gap:10px}
.phblock .ph-name .pd{width:9px;height:9px;border-radius:3px;background:var(--gc);flex:none}
.phblock .ph-name .ph-ic{width:27px;height:27px;border-radius:8px;flex:none;display:grid;place-items:center;background:color-mix(in srgb,var(--gc) 12%,#fff);color:var(--gc);border:1px solid color-mix(in srgb,var(--gc) 20%,#fff)}
.phblock .ph-name .ph-ic svg{width:16px;height:16px}
.phblock .ph-cnt{font-size:12px;color:var(--muted-2);font-weight:600;white-space:nowrap}
.artlist{list-style:none;margin:0;padding:0}
.artlist a{display:flex;align-items:center;gap:10px;padding:7px 8px;border-radius:8px;font-size:14px;color:var(--ink);transition:.12s}
.artlist a:hover{background:#fff;color:var(--ink)}
/* icon bài viết = ô xanh; video = ô cam (nhận diện qua .vtag) */
.artlist a .ai{width:27px;height:27px;padding:5px;border-radius:8px;box-sizing:border-box;flex:none;transition:.15s;
  background:linear-gradient(135deg,#EAF1FC,#D8E6F8);border:1px solid #CFDFF4;color:#1E57A0;
  box-shadow:0 1px 2px rgba(30,87,160,.10)}
.artlist a:hover .ai{transform:translateY(-1px);box-shadow:0 4px 10px -4px rgba(30,87,160,.45)}
/* video: nút đỏ kiểu YouTube (glyph tự chứa, không tile) */
.artlist a:has(.vtag) .ai{background:none;border:0;box-shadow:none;padding:0;width:28px;height:28px;transform:none}
.artlist a:has(.vtag):hover .ai{transform:scale(1.06);box-shadow:none}
.artlist a .name{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.artlist a .vtag{margin-left:auto;display:inline-flex;align-items:center;gap:4px;font-size:10px;font-weight:700;letter-spacing:.03em;
  color:#C4302B;background:#FDE7E6;padding:2px 8px 2px 6px;border-radius:999px;flex:none}
.artlist a .vtag::before{content:"";width:0;height:0;border-left:6px solid currentColor;border-top:3.5px solid transparent;border-bottom:3.5px solid transparent}
.ph-more{margin-top:10px;display:inline-flex;align-items:center;gap:6px;font-size:13px;font-weight:600;color:var(--link);padding:4px 2px;transition:.14s}
.ph-more:hover{gap:9px}

/* ===== Video cards ===== */
.vgrid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.vcard{border:1px solid var(--border);border-radius:12px;overflow:hidden;background:#fff;transition:.16s}
.vcard:hover{box-shadow:var(--shadow-md);transform:translateY(-3px);border-color:var(--teal-100)}
.vthumb{position:relative;aspect-ratio:16/9;background:linear-gradient(135deg,#14417E,#0A1C3D);display:grid;place-items:center}
.vthumb .play{width:60px;height:42px;border-radius:12px;background:#FF0000;display:grid;place-items:center;color:#fff;box-shadow:0 8px 20px -6px rgba(255,0,0,.55)}
.vcard:hover .vthumb .play{background:#e60000}
.vthumb .dur{position:absolute;right:8px;bottom:8px;font-size:11px;font-weight:600;color:#fff;background:rgba(0,0,0,.6);padding:2px 7px;border-radius:5px}
.vthumb .vbadge{position:absolute;left:10px;top:10px;font-size:10.5px;font-weight:700;color:#fff;background:rgba(255,255,255,.2);border:1px solid rgba(255,255,255,.35);padding:2px 8px;border-radius:999px}
.vcard .vmeta{padding:13px 15px 15px}
.vcard .vt{font-weight:600;font-size:14px;line-height:1.35}
.vcard .vc{font-size:12px;color:var(--muted-2);margin-top:5px}

/* ===== FAQ accordion ===== */
.faq{max-width:860px;margin:0 auto;display:flex;flex-direction:column;gap:10px}
.faq-item{border:1px solid var(--border);border-radius:11px;background:#fff;overflow:hidden;transition:.15s}
.faq-item.open{border-color:var(--teal-100);box-shadow:var(--shadow-md)}
.faq-q{display:flex;align-items:center;justify-content:space-between;gap:14px;padding:16px 20px;font-weight:600;font-size:15px;cursor:pointer}
.faq-item.open .faq-q{color:var(--brand)}
.faq-q .fic{color:var(--muted-2);transition:.2s;flex:none}
.faq-item.open .faq-q .fic{transform:rotate(180deg);color:var(--brand)}
.faq-a{padding:0 20px 17px;font-size:14px;color:var(--muted);line-height:1.7;display:none}
.faq-item.open .faq-a{display:block}

/* ===== Footer multi-column (base.vn light) ===== */
.footer-cols{background:var(--surface);border-top:1px solid var(--border)}
.footer-cols .container{padding:46px 24px 26px;display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:32px}
.fcol h5{font-family:var(--ff-display);font-weight:700;font-size:12.5px;letter-spacing:.09em;text-transform:uppercase;color:var(--ink);margin:0 0 15px}
.fcol .brand{color:var(--ink);margin-bottom:14px}
.fcol .foot-logo{height:34px;display:block;margin-bottom:14px}
.fcol .brand small{color:var(--muted-2)}
.fcol p.desc{font-size:13.5px;color:var(--muted);line-height:1.65;margin:0 0 16px;max-width:34ch}
.fcol a,.fcol .frow{display:block;font-size:13.5px;color:var(--muted);margin:0 0 10px}
.fcol a:hover{color:var(--brand)}
.footer-bottom{border-top:1px solid var(--border);text-align:center;font-size:12.5px;color:var(--muted-2);padding:16px;background:var(--surface)}

.section.alt{background:var(--surface)}

@media(max-width:1000px){
  .artdoc{grid-template-columns:1fr}
  .rail,.toc{display:none}
  .two-col{grid-template-columns:1fr}
  .grid{grid-template-columns:1fr 1fr}
  .hero .container{grid-template-columns:1fr;padding-bottom:44px}
  .hero-art{display:none}
  .topnav{display:none}
  .dir2{grid-template-columns:1fr}
  .vgrid{grid-template-columns:1fr 1fr}
  .footer-cols .container{grid-template-columns:1fr 1fr}
}

/* ============ Cập nhật tính năng (dòng thời gian) ============ */
.upd-hero{background:linear-gradient(135deg,#1E57A0,#14417E 55%,#0E2F5F);color:#fff;padding:44px 0 40px}
.upd-hero h1{font-family:var(--ff-display);font-weight:800;font-size:30px;margin:0 0 8px;letter-spacing:-.5px}
.upd-hero p{margin:0;font-size:15px;opacity:.82;max-width:640px}
.upd-filter{display:flex;gap:8px;flex-wrap:wrap;margin:22px 0 8px}
.upd-filter a{font-size:13px;font-weight:600;padding:7px 13px;border-radius:999px;text-decoration:none;color:var(--muted);background:var(--card);border:1px solid var(--border)}
.upd-filter a:hover{border-color:var(--brand);color:var(--brand)}
.upd-filter a.on{background:var(--brand);border-color:var(--brand);color:#fff}

.tl{position:relative;margin-top:26px;padding-left:8px}
.tl-month{font-family:var(--ff-display);font-weight:800;font-size:15px;color:var(--muted-2);text-transform:uppercase;letter-spacing:.6px;margin:30px 0 14px}
.tl-month:first-child{margin-top:6px}
.tl-list{position:relative;padding-left:26px;border-left:2px solid var(--border)}
.tl-item{position:relative;padding:0 0 22px}
.tl-item::before{content:"";position:absolute;left:-33px;top:6px;width:12px;height:12px;border-radius:50%;background:#fff;border:2.5px solid var(--border-2)}
.tl-item.major::before{border-color:#DD8A2A;background:#FDF3E6}
.upd-card{background:var(--card);border:1px solid var(--border);border-radius:12px;padding:16px 18px;box-shadow:var(--shadow-sm);transition:.14s}
.upd-card:hover{border-color:var(--brand);box-shadow:0 12px 28px -16px rgba(30,87,160,.5);transform:translateY(-1px)}
.upd-meta{display:flex;align-items:center;gap:9px;flex-wrap:wrap;font-size:12.5px;color:var(--muted-2);margin-bottom:7px}
.upd-ver{font-weight:700;color:var(--brand);background:#E9EFF7;border-radius:6px;padding:2px 8px}
.upd-big{font-weight:700;color:#B4741F;background:#FDF3E6;border-radius:999px;padding:2px 9px;display:inline-flex;align-items:center;gap:5px}
.upd-sub{font-weight:600;color:var(--muted)}
.upd-card h3{font-family:var(--ff-display);font-weight:700;font-size:17px;margin:0 0 5px}
.upd-card h3 a{color:var(--ink);text-decoration:none}
.upd-card h3 a:hover{color:var(--brand)}
.upd-card p{margin:0;font-size:14px;color:var(--muted);line-height:1.55}
.upd-empty{background:var(--card);border:1px dashed var(--border-2);border-radius:12px;padding:44px;text-align:center;color:var(--muted);font-size:14.5px}

/* ============ Câu hỏi thường gặp ============ */
.faq-search{margin:22px 0 4px;position:relative;max-width:520px}
.faq-search input{width:100%;height:44px;border:1px solid var(--border);border-radius:999px;padding:0 18px 0 42px;font:inherit;font-size:14.5px;color:var(--ink);background:var(--card);outline:0}
.faq-search input:focus{border-color:var(--brand);box-shadow:0 0 0 4px rgba(30,87,160,.1)}
.faq-search svg{position:absolute;left:15px;top:13px;color:var(--muted-2)}
.faq-group{margin-top:30px}
.faq-group h2{font-family:var(--ff-display);font-weight:800;font-size:18px;margin:0 0 12px;display:flex;align-items:center;gap:10px}
.faq-group h2 .n{font-size:12.5px;font-weight:600;color:var(--muted-2);background:var(--card);border:1px solid var(--border);border-radius:999px;padding:2px 9px}
.faq-item{background:var(--card);border:1px solid var(--border);border-radius:11px;margin-bottom:9px;overflow:hidden}
.faq-q{display:flex;align-items:center;gap:11px;width:100%;text-align:left;border:0;background:none;padding:14px 17px;font:inherit;font-size:14.8px;font-weight:600;color:var(--ink);cursor:pointer}
.faq-q:hover{color:var(--brand)}
.faq-q .cv{margin-left:auto;flex:none;transition:.16s;color:var(--muted-2)}
.faq-item.open .faq-q .cv{transform:rotate(180deg)}
.faq-a{display:none;padding:0 17px 16px;font-size:14.5px;color:var(--muted);line-height:1.68;border-top:1px solid var(--border)}
.faq-item.open .faq-a{display:block;padding-top:13px}
.faq-a p{margin:0 0 10px}
.faq-a img{max-width:100%;height:auto;border-radius:8px}
.faq-none{display:none;padding:34px;text-align:center;color:var(--muted)}

/* ============ Trang Video hướng dẫn (lưới thumbnail) ============ */
.vid-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;margin-top:26px}
@media(max-width:980px){.vid-grid{grid-template-columns:1fr 1fr}}
@media(max-width:620px){.vid-grid{grid-template-columns:1fr}}
.vid-card{display:block;text-decoration:none;color:inherit;background:var(--card);border:1px solid var(--border);border-radius:13px;overflow:hidden;box-shadow:var(--shadow-sm);transition:.15s}
.vid-card:hover{border-color:var(--brand);box-shadow:0 16px 34px -20px rgba(30,87,160,.6);transform:translateY(-2px)}
.vid-thumb{position:relative;aspect-ratio:16/9;background:linear-gradient(135deg,#1E57A0,#14417E 55%,#0E2F5F);overflow:hidden}
.vid-thumb img{width:100%;height:100%;object-fit:cover;display:block}
.vid-thumb .ph{position:absolute;inset:0;display:grid;place-items:center;color:rgba(255,255,255,.35)}
.vid-play{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);width:52px;height:37px;border-radius:9px;background:rgba(255,0,0,.92);display:grid;place-items:center;box-shadow:0 6px 18px -6px rgba(0,0,0,.55);transition:.15s}
.vid-card:hover .vid-play{background:#FF0000;transform:translate(-50%,-50%) scale(1.08)}
.vid-time{position:absolute;right:8px;bottom:8px;background:rgba(8,20,38,.82);color:#fff;font-size:11.5px;font-weight:700;padding:2px 7px;border-radius:5px}
.vid-body{padding:13px 15px 15px}
.vid-body h3{font-family:var(--ff-display);font-weight:700;font-size:15.5px;line-height:1.4;margin:0 0 7px;color:var(--ink)}
.vid-card:hover .vid-body h3{color:var(--brand)}
.vid-meta{display:flex;align-items:center;gap:8px;font-size:12.5px;color:var(--muted-2)}
.vid-meta .path{flex:1;min-width:0;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.vid-meta .views{flex:none;display:inline-flex;align-items:center;gap:4px;font-weight:600}
.vid-bar{display:flex;gap:14px;align-items:center;flex-wrap:wrap;margin-top:20px}
.vid-search{position:relative;flex:none;width:280px}
.vid-search input{width:100%;height:40px;border:1px solid var(--border);border-radius:999px;padding:0 16px 0 40px;font:inherit;font-size:14px;color:var(--ink);background:var(--card);outline:0}
.vid-search input:focus{border-color:var(--brand);box-shadow:0 0 0 4px rgba(30,87,160,.1)}
.vid-search svg{position:absolute;left:14px;top:11px;color:var(--muted-2)}

/* ============ Phân trang trang công khai ============ */
.pgn{display:flex;align-items:center;gap:6px;flex-wrap:wrap}
.pgn-a{display:inline-grid;place-items:center;min-width:36px;height:36px;padding:0 11px;border:1px solid var(--border);border-radius:9px;background:var(--card);color:var(--muted);font-size:13.5px;font-weight:600;text-decoration:none;transition:.13s}
.pgn-a:hover{border-color:var(--brand);color:var(--brand)}
.pgn-a.on{background:var(--brand);border-color:var(--brand);color:#fff}
.pgn-a.off{opacity:.4;pointer-events:none}
.pgn-gap{color:var(--muted-2);padding:0 3px}
.pgn-info{margin-left:auto;font-size:13px;color:var(--muted-2)}
@media(max-width:620px){.pgn-info{margin-left:0;width:100%;order:-1;margin-bottom:8px}}