/* Trợ lý ảo BCY — trang giới thiệu. Phong cách cổng thông tin cơ quan hành chính: đỏ – vàng – xanh navy, nền sáng.
   Không font/thư viện ngoài, không style nội tuyến (CSP chặt). */
:root{
  --red:#2563eb; --red-d:#1747b8; --red-l:#e6eeff; --bad:#e11d48; --bad-l:#ffe4ea;
  --gold:#ffc531; --gold-d:#f5a300; --gold-l:#fff3cc;
  --cream:#f4f8ff; --cream2:#e8f1ff;
  --navy:#10245c; --navy-d:#0a1740; --blue:#0284c7; --blue-l:#e0f2fe;
  --green:#15803d; --green-l:#dcf7e6; --teal:#0e9aa7; --violet:#7c3aed; --pink:#ec4899; --orange:#d9480f;
  --ink:#16213e; --muted:#4a5878; --line:#d7e3f8; --white:#fff;
  --sans:-apple-system,BlinkMacSystemFont,"SF Pro Text","Segoe UI",Roboto,"Helvetica Neue",Arial,"Noto Sans",sans-serif;
  --serif:"Iowan Old Style","Palatino Linotype",Palatino,Georgia,"Times New Roman",serif;
  --mono:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --nav-h:72px;
  --hoavan:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='28' height='14' viewBox='0 0 28 14'%3E%3Cpath d='M14 1l6 6-6 6-6-6z' fill='%23ffc72c'/%3E%3Ccircle cx='0' cy='7' r='2' fill='%23ffc72c'/%3E%3Ccircle cx='28' cy='7' r='2' fill='%23ffc72c'/%3E%3C/svg%3E");
  color-scheme:light;
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:calc(var(--nav-h) + 12px);-webkit-text-size-adjust:100%}
body{margin:0;background:var(--cream);color:var(--ink);font-family:var(--sans);font-size:17px;line-height:1.65;overflow-x:hidden;-webkit-font-smoothing:antialiased}
img,svg{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
h1,h2,h3,h4{margin:0;line-height:1.2;font-weight:800;letter-spacing:-.005em;color:var(--navy)}
p{margin:0}
ul{margin:0;padding:0;list-style:none}
:focus-visible{outline:3px solid var(--blue);outline-offset:3px;border-radius:6px}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.skip{position:absolute;left:12px;top:-60px;z-index:100;background:var(--gold);color:var(--navy);padding:10px 16px;border-radius:8px;font-weight:700}
.skip:focus{top:12px}
.wrap{width:100%;max-width:1180px;margin:0 auto;padding:0 20px}
.ico{width:1.25em;height:1.25em;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round;flex:none}
.mono{font-family:var(--mono)}
.grad{color:var(--red)}

/* ---------- Thanh điều hướng ---------- */
.nav{position:fixed;top:0;left:0;right:0;z-index:50;height:var(--nav-h);display:flex;align-items:center;background:var(--white);border-bottom:4px solid var(--red);box-shadow:0 4px 0 var(--gold)}
.nav .wrap{display:flex;align-items:center;justify-content:space-between;gap:16px}
.brand{display:flex;align-items:center;gap:12px;font-weight:800;color:var(--red);font-size:18px;line-height:1.15;text-transform:uppercase;letter-spacing:.01em}
.brand-mark{width:42px;height:42px;border-radius:50%;background:var(--red);display:grid;place-items:center;color:var(--gold);border:3px solid var(--gold);box-shadow:0 0 0 2px var(--red)}
.brand-mark .ico{width:21px;height:21px;stroke-width:2.2}
.brand small{display:block;font-size:11px;font-weight:600;color:var(--navy);letter-spacing:.1em;margin-top:2px}
.menu{display:flex;align-items:center;gap:2px}
.menu a{white-space:nowrap;padding:9px 13px;border-radius:6px;font-size:15px;font-weight:600;color:var(--navy);position:relative}
.menu a:hover{color:var(--red);background:var(--red-l)}
.menu a.active{color:var(--red)}
.menu a.active::after{content:"";position:absolute;left:13px;right:13px;bottom:2px;height:3px;background:var(--red);border-radius:2px}
.menu .cta{margin-left:10px;background:var(--red);color:#fff;border-radius:6px;box-shadow:3px 3px 0 var(--gold)}
.menu .cta:hover{background:var(--red-d);color:#fff}
.menu .cta::after{display:none}
.burger{display:none;width:46px;height:46px;border-radius:8px;border:2px solid var(--red);place-items:center;color:var(--red)}
.burger .ico{width:24px;height:24px}

/* ---------- Nút ---------- */
.btn{display:inline-flex;align-items:center;gap:10px;padding:14px 26px;border-radius:8px;font-weight:700;font-size:16px;transition:transform .15s,box-shadow .15s,background .2s;min-height:50px;border:2px solid transparent}
.btn-primary{background:var(--gold);color:var(--navy-d);border-color:var(--navy-d);box-shadow:4px 4px 0 var(--navy-d)}
.btn-primary:hover{transform:translate(-2px,-2px);box-shadow:6px 6px 0 var(--navy-d)}
.btn-ghost{color:#fff;border-color:rgba(255,255,255,.85);background:transparent}
.btn-ghost:hover{background:#fff;color:var(--red)}
.btn-red{background:var(--red);color:#fff;border-color:var(--red-d);box-shadow:4px 4px 0 var(--gold)}
.btn-red:hover{transform:translate(-2px,-2px);box-shadow:6px 6px 0 var(--gold)}

/* ---------- Bố cục chung ---------- */
section{position:relative;padding:92px 0}
.eyebrow{display:inline-flex;align-items:center;gap:10px;font-size:14px;letter-spacing:.14em;text-transform:uppercase;color:var(--red);font-weight:800}
.eyebrow::before,.eyebrow::after{content:"";width:9px;height:9px;background:var(--gold);transform:rotate(45deg);border:2px solid var(--red)}
.h2{font-size:clamp(28px,3.9vw,44px);margin-top:14px;text-transform:none}
.h2 .grad{color:var(--red)}
.lead{margin-top:16px;color:var(--muted);font-size:clamp(17px,1.5vw,19px);max-width:740px}
.sec-head{margin-bottom:52px}
.sec-head.center{text-align:center}.sec-head.center .lead{margin-inline:auto}
.sec-head .orn{display:block;width:120px;height:14px;margin-top:18px;background:var(--hoavan) repeat-x;background-color:var(--red);border-radius:3px}
.sec-head.center .orn{margin-inline:auto}
.alt{background:var(--cream2)}
.white{background:#fff}

.card{background:#fff;border:2px solid var(--line);border-top:6px solid var(--red);border-radius:12px;padding:28px;position:relative;transition:transform .2s,box-shadow .2s;box-shadow:0 2px 0 rgba(14,42,107,.05)}
.card:hover{transform:translateY(-4px);box-shadow:6px 8px 0 rgba(14,42,107,.12)}
.card h3{font-size:20px;margin:16px 0 8px}
.card p{color:var(--muted);font-size:16px}
.c-gold{border-top-color:var(--gold)}.c-blue{border-top-color:var(--blue)}.c-green{border-top-color:var(--green)}.c-teal{border-top-color:var(--teal)}
.ico-box{width:52px;height:52px;border-radius:14px;display:grid;place-items:center;color:var(--red);background:var(--red-l)}
.ico-box .ico{width:26px;height:26px}
.ico-box.gold{color:#8a5a00;background:var(--gold-l)}
.ico-box.blue{color:var(--blue);background:var(--blue-l)}
.ico-box.green{color:var(--green);background:var(--green-l)}
.ico-box.red{color:var(--violet);background:#efe7ff}

/* reveal */
.rv{opacity:0;transform:translateY(22px);transition:opacity .7s ease,transform .7s ease}
.rv.in{opacity:1;transform:none}
.d1{transition-delay:.08s}.d2{transition-delay:.16s}.d3{transition-delay:.24s}.d4{transition-delay:.32s}
.no-js .rv{opacity:1;transform:none}

/* ---------- Hero ---------- */
.hero{padding:calc(var(--nav-h) + 64px) 0 110px;overflow:hidden;color:#fff;background:#1d4ed8}
.hero::before{content:"";position:absolute;right:-180px;top:-120px;width:760px;height:760px;border-radius:50%;
  background:repeating-radial-gradient(circle at center,rgba(255,199,44,.28) 0 3px,transparent 3px 30px),radial-gradient(circle,rgba(255,199,44,.18) 0 90px,transparent 91px);pointer-events:none}
.hero::after{content:"";position:absolute;left:0;right:0;bottom:0;height:14px;background:var(--hoavan) repeat-x,var(--red-d)}
.hero .wrap{display:grid;grid-template-columns:1.05fr .95fr;gap:52px;align-items:center;position:relative;z-index:1}
.pill{display:inline-flex;align-items:center;gap:10px;padding:7px 16px 7px 8px;border:2px solid var(--gold);border-radius:999px;font-size:14.5px;color:#fff;background:rgba(0,0,0,.14)}
.pill b{background:var(--gold);color:var(--red-d);border-radius:999px;padding:2px 11px;font-size:12px;letter-spacing:.06em}
.hero h1{color:#fff;font-size:clamp(36px,5.6vw,66px);margin-top:22px;line-height:1.1;font-weight:800;letter-spacing:-.015em;text-transform:none}
.hero h1 .grad{color:var(--gold)}
.hero .sub{margin-top:22px;font-size:clamp(17px,1.6vw,20px);color:#ffeef0;max-width:590px}
.hero .sub b{color:#fff;background:linear-gradient(transparent 62%,rgba(255,199,44,.55) 62%)}
.hero .actions{display:flex;flex-wrap:wrap;gap:16px;margin-top:34px}
.trust{display:flex;flex-wrap:wrap;gap:10px 24px;margin-top:34px;color:#fff;font-size:15.5px;font-weight:500}
.trust li{display:flex;align-items:center;gap:9px}
.trust .ico{color:var(--gold);stroke-width:2.6}

/* cửa sổ trò chuyện minh hoạ */
.win{border-radius:14px;border:3px solid var(--navy-d);background:#fff;box-shadow:10px 10px 0 var(--navy-d);overflow:hidden;color:var(--ink)}
.win-bar{display:flex;align-items:center;gap:8px;padding:11px 16px;background:var(--navy);color:#fff}
.win-bar i{width:11px;height:11px;border-radius:50%;background:var(--gold)}
.win-bar i:nth-child(1){background:#ff6b6b}.win-bar i:nth-child(3){background:#58d68d}
.win-bar span{margin-left:10px;font-size:13.5px;font-weight:600}
.win-tag{margin-left:auto;font-size:11px;letter-spacing:.1em;text-transform:uppercase;border:1px solid rgba(255,255,255,.5);padding:2px 9px;border-radius:999px;font-style:normal}
.chat{padding:22px 20px 20px;min-height:440px;display:flex;flex-direction:column;gap:16px;font-size:15.5px;background:#fbfcff}
.msg-u{align-self:flex-end;max-width:88%;background:var(--navy);color:#fff;padding:12px 16px;border-radius:14px 14px 3px 14px}
.msg-a{align-self:flex-start;max-width:97%;display:flex;gap:12px}
.av{flex:none;width:34px;height:34px;border-radius:50%;background:var(--red);display:grid;place-items:center;color:var(--gold);border:2px solid var(--gold)}
.av .ico{width:18px;height:18px;stroke-width:2.2}
.bubble{background:#fff;border:2px solid var(--line);padding:13px 16px;border-radius:3px 14px 14px 14px;line-height:1.6;min-height:24px;color:var(--ink)}
.steps{display:flex;flex-wrap:wrap;gap:7px;margin-bottom:10px}
.step{font-size:12.5px;padding:3px 11px;border-radius:999px;border:2px solid var(--line);color:var(--muted);font-weight:600;display:inline-flex;align-items:center;gap:6px;transition:all .3s;background:#fff}
.step::before{content:"";width:7px;height:7px;border-radius:50%;background:#c4bba5}
.step.on{color:#8a5a00;border-color:var(--gold-d);background:var(--gold-l)}.step.on::before{background:var(--gold-d);animation:pulse 1s infinite}
.step.done{color:var(--green);border-color:var(--green);background:var(--green-l)}.step.done::before{background:var(--green);animation:none}
@keyframes pulse{50%{opacity:.35;transform:scale(1.5)}}
.cite{display:inline-block;font-size:12px;font-weight:800;color:var(--red-d);background:var(--gold);border-radius:5px;padding:0 6px;margin:0 2px;vertical-align:1px}
.src{margin-top:12px;padding:10px 12px;border-radius:8px;border:2px dashed var(--gold-d);background:var(--gold-l);font-size:13.5px;color:var(--ink);display:flex;gap:6px;flex-wrap:wrap;align-items:baseline}
.src b{color:var(--red-d)}
.caret::after{content:"";display:inline-block;width:8px;height:1.05em;background:var(--red);margin-left:3px;vertical-align:-2px;animation:blink 1s steps(2) infinite}
@keyframes blink{50%{opacity:0}}
.warnbox{border-color:var(--gold-d);background:var(--gold-l)}
.chat-foot{margin-top:auto;display:flex;gap:10px;align-items:center;border:2px solid var(--line);border-radius:10px;padding:11px 14px;color:var(--muted);font-size:14px;background:#fff}
.chat-foot .ico{color:var(--red)}
.amain{min-width:0;flex:1}

/* ---------- Số liệu ---------- */
.stats{padding:0 0 30px;margin-top:-52px;z-index:2}
.stats .grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.stat{background:#fff;border:2px solid var(--line);border-top:6px solid var(--red);border-radius:12px;padding:24px 22px;box-shadow:0 8px 0 rgba(14,42,107,.08)}
.stat:nth-child(2){border-top-color:var(--blue)}.stat:nth-child(3){border-top-color:var(--green)}.stat:nth-child(4){border-top-color:var(--gold)}
.stat .num{font-size:clamp(36px,4vw,50px);font-weight:800;line-height:1;color:var(--red)}
.stat:nth-child(2) .num{color:var(--blue)}.stat:nth-child(3) .num{color:var(--green)}.stat:nth-child(4) .num{color:var(--gold-d)}
.stat .num small{font-size:.5em;font-weight:700}
.stat .lbl{margin-top:10px;color:var(--muted);font-size:15px;line-height:1.5}

/* ---------- Bài toán ---------- */
.three{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.problem .tag{font-size:12.5px;letter-spacing:.14em;text-transform:uppercase;color:var(--red);font-weight:800}
.problem h3{margin-top:8px}
.problem .ans{margin-top:16px;padding-top:16px;border-top:2px dashed var(--line);color:var(--ink);font-size:15.5px;display:flex;gap:10px;font-weight:500}
.problem .ans .ico{color:var(--green);margin-top:4px;stroke-width:2.6}

/* ---------- Chức năng (tab) ---------- */
.feat{display:grid;grid-template-columns:320px 1fr;gap:28px;align-items:start}
.tabs{display:flex;flex-direction:column;gap:6px;position:sticky;top:calc(var(--nav-h) + 24px);background:#fff;border:2px solid var(--line);border-radius:14px;padding:10px}
.tab{display:flex;align-items:center;gap:13px;padding:13px 14px;border-radius:9px;text-align:left;color:var(--navy);transition:all .2s;font-size:15.5px;font-weight:600}
.tab .ico{color:var(--blue)}
.tab:hover{background:var(--cream2)}
.tab[aria-selected="true"]{background:var(--red);color:#fff;box-shadow:3px 3px 0 var(--gold)}
.tab[aria-selected="true"] .ico{color:var(--gold)}
.panel{border:2px solid var(--line);border-radius:16px;background:#fff;padding:34px;min-height:560px;animation:fadeup .4s both;box-shadow:8px 8px 0 rgba(37,99,235,.12)}
.panel[hidden]{display:none}
@keyframes fadeup{from{opacity:0;transform:translateY(12px)}}
.panel h3{font-size:clamp(23px,2.7vw,31px)}
.panel h3 .grad{color:var(--red)}
.panel .intro{margin-top:12px;color:var(--muted);font-size:17px}
.bul{margin-top:22px;display:grid;gap:13px}
.bul li{display:flex;gap:12px;font-size:16px;color:var(--ink)}
.bul li::before{content:"";flex:none;width:10px;height:10px;margin-top:9px;background:var(--gold);border:2px solid var(--red);transform:rotate(45deg)}
.bul b{color:var(--navy)}
.demo{margin-top:28px;border:2px dashed var(--gold-d);border-radius:12px;background:var(--cream);padding:18px;font-size:14.5px;overflow:hidden}
.demo-t{font-size:12px;letter-spacing:.14em;text-transform:uppercase;color:var(--red);font-weight:800;margin-bottom:12px;display:flex;justify-content:space-between;gap:10px}
.row{display:flex;align-items:center;gap:12px;padding:10px 13px;border-radius:9px;border:2px solid var(--line);background:#fff}
.row+.row{margin-top:8px}
.row .ico{color:var(--blue)}
.row .grow{flex:1;min-width:0}
.badge{font-size:12px;font-weight:700;padding:2px 10px;border-radius:999px;border:2px solid var(--line);color:var(--muted);white-space:nowrap;background:#fff}
.badge.ok{color:var(--green);border-color:var(--green);background:var(--green-l)}
.badge.warn{color:#8a5a00;border-color:var(--gold-d);background:var(--gold-l)}
.badge.bad{color:var(--bad);border-color:var(--bad);background:var(--bad-l)}
.badge.gold{color:var(--navy);border-color:var(--blue);background:var(--blue-l)}
.del{color:var(--bad);text-decoration:line-through}
.ins{color:var(--green);background:var(--green-l);border-radius:4px;padding:0 4px;font-weight:600}
.docline{padding:12px 16px;border-left:5px solid var(--red);background:#fff;line-height:1.85}
.slides{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}
.slide{aspect-ratio:16/10;border-radius:8px;border:2px solid var(--red);background:#fff;padding:0;overflow:hidden;display:flex;flex-direction:column;font-size:12px;color:var(--muted)}
.slide b{display:block;color:#fff;background:var(--red);font-size:12.5px;line-height:1.3;padding:6px 10px}
.slide span{padding:10px}
.slide i{display:block;height:6px;border-radius:3px;background:var(--gold);margin-top:7px}
.slide i.s{width:60%;background:#b9c7e6}.slide i.m{width:85%}
.wave{display:flex;align-items:center;gap:3px;height:42px}
.wave i{flex:1;background:var(--red);border-radius:3px;animation:wv 1.2s ease-in-out infinite}
.wave i:nth-child(odd){animation-delay:-.4s;background:var(--gold-d)}.wave i:nth-child(3n){animation-delay:-.8s}
@keyframes wv{0%,100%{height:20%}50%{height:100%}}
.scan-frame{display:grid;grid-template-columns:1fr 40px 1fr;gap:12px;align-items:center}
.paper{border-radius:6px;background:#fffdf6;color:#2a2a2a;padding:12px 14px;font-size:11.5px;line-height:1.5;font-family:var(--serif);position:relative;overflow:hidden;border:1px solid #d8cfb6;box-shadow:3px 3px 0 rgba(14,42,107,.15)}
.paper.bad{filter:blur(.5px) contrast(.8) sepia(.3);transform:rotate(-1.5deg)}
.paper .stamp{position:absolute;right:10px;bottom:8px;width:44px;height:44px;border-radius:50%;border:2px solid #c0222f;color:#c0222f;display:grid;place-items:center;font-size:9px;font-weight:700;transform:rotate(-12deg);opacity:.85}
.paper .sig{color:#1e4fbf;font-style:italic;font-size:14px}
.arrow-mid{display:grid;place-items:center;color:var(--red)}
.mini-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:10px}
.mini-grid .row+.row{margin-top:0}

/* ---------- Khác biệt ---------- */
.six{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.why .card .k{position:absolute;right:20px;top:14px;font-size:50px;font-weight:800;color:var(--cream2);line-height:1}

/* ---------- Bảo mật (nền xanh navy) ---------- */
#bao-mat{background:var(--navy);color:#fff}
#bao-mat::before{content:"";position:absolute;left:0;right:0;top:0;height:14px;background:var(--hoavan) repeat-x,var(--red)}
#bao-mat .h2{color:#fff}
#bao-mat .h2 .grad{color:var(--gold)}
#bao-mat .eyebrow{color:var(--gold)}#bao-mat .eyebrow::before,#bao-mat .eyebrow::after{border-color:var(--gold)}
#bao-mat .lead{color:#cfd9f2}
.sec-grid{display:grid;grid-template-columns:1fr 1fr;gap:32px;align-items:start}
.layers{display:grid;gap:12px}
.layer{display:flex;gap:16px;padding:18px 20px;border-radius:12px;border:2px solid rgba(255,255,255,.18);background:rgba(255,255,255,.07)}
.layer h4{font-size:17px;color:#fff}
.layer p{color:#cfd9f2;font-size:15px;margin-top:3px}
.layer .ico-box{width:44px;height:44px;border-radius:12px;background:var(--gold);color:var(--navy-d)}
.layer .ico-box.red{background:#fff;color:var(--red)}
.clr{border:3px solid var(--gold);border-radius:16px;padding:26px;background:#fff;color:var(--ink);box-shadow:8px 8px 0 var(--navy-d)}
.clr h3{font-size:21px}
.clr .hint{color:var(--muted);font-size:15px;margin-top:6px}
.who{display:flex;flex-wrap:wrap;gap:8px;margin:18px 0}
.who button{padding:9px 15px;border-radius:8px;border:2px solid var(--navy);font-size:14.5px;font-weight:600;color:var(--navy);transition:all .15s;min-height:44px;background:#fff}
.who button:hover{background:var(--blue-l)}
.who button[aria-pressed="true"]{background:var(--red);color:#fff;border-color:var(--red-d);box-shadow:3px 3px 0 var(--gold)}
.who-info{font-size:14px;color:var(--muted);margin-bottom:12px;min-height:44px}
.docs{display:grid;gap:8px}
.doc{display:flex;align-items:center;gap:12px;padding:11px 14px;border-radius:10px;border:2px solid var(--green);background:var(--green-l);transition:all .3s}
.doc .t{flex:1;min-width:0;font-size:15px;font-weight:600}
.doc .m{font-size:12.5px;color:var(--muted);display:block;margin-top:1px;font-weight:400}
.doc .ico{color:var(--green);stroke-width:2.6}
.doc.lock{border-color:#f3a6b6;background:repeating-linear-gradient(135deg,#fff1f4 0 9px,#ffe0e7 9px 18px)}
.doc.lock .ico{color:var(--bad)}
.doc.lock .t{filter:blur(3.5px);user-select:none;color:#7a6a6c}
.verdict{margin-top:14px;font-size:14.5px;color:var(--ink);padding:12px 14px;border-radius:10px;background:var(--gold-l);border:2px solid var(--gold-d)}

/* ---------- Kiến trúc ---------- */
.arch{border:2px solid var(--line);border-radius:18px;background:#fff;padding:30px;box-shadow:8px 8px 0 rgba(14,42,107,.1)}
.arch svg{width:100%;height:auto}
.arch .band{fill:#f5f8ff;stroke:#b8c8ec;stroke-width:2}
.arch .band.core{fill:var(--gold-l);stroke:var(--gold-d)}
.arch .band.sec{fill:none;stroke:var(--red);stroke-width:3}
.arch .node{fill:#fff;stroke:var(--blue);stroke-width:2}
.arch .t1{fill:var(--navy);font-size:17px;font-weight:800;font-family:var(--sans)}
.arch .t2{fill:#4a5670;font-size:13.5px;font-family:var(--sans)}
.arch .t3{fill:var(--red);font-size:12px;letter-spacing:.14em;font-weight:800;font-family:var(--sans)}
.arch .flow{stroke:var(--red);stroke-width:3;fill:none;stroke-dasharray:5 7;animation:dash 1.4s linear infinite}
.arch .gate{fill:var(--red)}
@keyframes dash{to{stroke-dashoffset:-24}}
.arch-note{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-top:22px}
.arch-note div{padding:16px 18px;border-radius:10px;border:2px solid var(--line);background:var(--cream);font-size:15px;color:var(--muted)}
.arch-note b{display:block;color:var(--navy);margin-bottom:3px}

/* ---------- Kết quả ---------- */
.res{display:grid;grid-template-columns:1.25fr .75fr;gap:24px}
.bars{padding:30px}
.bars h3{font-size:20px;margin:0 0 4px}
.bars .cap{color:var(--muted);font-size:14px;margin-bottom:12px}
.bgrp{margin-top:22px}
.bgrp>span{display:block;font-size:15px;margin-bottom:10px;font-weight:600;color:var(--ink)}
.bar{display:grid;grid-template-columns:130px 1fr 54px;align-items:center;gap:12px;font-size:14px;color:var(--muted)}
.bar+.bar{margin-top:8px}
.track{height:14px;border-radius:99px;background:#efe6d0;overflow:hidden;display:block}
.fill{display:block;height:100%;width:0;border-radius:99px;background:#9aa7c4;transition:width 1.3s cubic-bezier(.2,.7,.2,1) .15s}
.fill.hi{background:var(--red)}
.in .fill{width:var(--w)}
.bar b{color:var(--navy);text-align:right;font-variant-numeric:tabular-nums}
.big{display:flex;flex-direction:column;gap:20px}
.big .card{padding:26px}
.big .n{font-size:48px;font-weight:800;line-height:1;color:var(--red)}
.big .card:nth-child(2){border-top-color:var(--green)}.big .card:nth-child(2) .n{color:var(--green)}
.big p{margin-top:8px;font-size:15px}
.fine{margin-top:22px;font-size:13.5px;color:var(--muted);line-height:1.6;max-width:none}

/* ---------- So sánh ---------- */
.tbl-wrap{border:2px solid var(--line);border-radius:16px;overflow-x:auto;background:#fff}
table{width:100%;border-collapse:collapse;min-width:720px;font-size:15.5px}
th,td{padding:15px 20px;text-align:center;border-bottom:1px solid var(--line)}
th:first-child,td:first-child{text-align:left;color:var(--ink);font-weight:500}
thead th{font-size:14px;color:#fff;font-weight:700;background:var(--navy);vertical-align:bottom}
thead th.us{color:var(--red-d);background:var(--gold);font-size:15px}
tbody tr:nth-child(even){background:#fffaf0}
tbody td.us{background:var(--gold-l);border-left:2px solid var(--gold-d);border-right:2px solid var(--gold-d)}
tbody tr:last-child td{border-bottom:0}
.y{color:var(--green);font-weight:800}.p{color:#b07900;font-weight:800}.n{color:var(--bad);font-weight:800}
.tnote{margin-top:14px;font-size:13.5px;color:var(--muted)}

/* ---------- Triển khai ---------- */
.steps3{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;counter-reset:s}
.steps3 .card{counter-increment:s;padding-top:34px}
.steps3 .card::before{content:counter(s);position:absolute;top:-22px;left:24px;width:44px;height:44px;border-radius:50%;background:var(--red);color:var(--gold);border:3px solid var(--gold);display:grid;place-items:center;font-size:20px;font-weight:800;box-shadow:0 0 0 3px var(--red)}
.steps3 .card:nth-child(2)::before{background:var(--blue);box-shadow:0 0 0 3px var(--blue)}
.steps3 .card:nth-child(3)::before{background:var(--green);box-shadow:0 0 0 3px var(--green)}
.steps3{padding-top:14px}

/* ---------- Liên hệ ---------- */
.contact{padding-bottom:100px}
.contact .box{border-radius:20px;padding:60px 40px;text-align:center;color:#fff;border:3px solid var(--gold);position:relative;overflow:hidden;background:radial-gradient(500px 360px at 90% 0%,rgba(236,72,153,.5),transparent 70%),linear-gradient(135deg,#1d4ed8,#2563eb 55%,#0891b2);box-shadow:10px 10px 0 var(--navy-d)}
.contact .box::before{content:"";position:absolute;left:-140px;bottom:-200px;width:520px;height:520px;border-radius:50%;background:repeating-radial-gradient(circle at center,rgba(255,199,44,.28) 0 3px,transparent 3px 28px)}
.contact .box>*{position:relative}
.contact .eyebrow{color:var(--gold)}.contact .eyebrow::before,.contact .eyebrow::after{border-color:var(--gold)}
.contact .h2{margin-inline:auto;max-width:760px;color:#fff}
.contact .h2 .grad{color:var(--gold)}
.contact .actions{display:flex;justify-content:center;flex-wrap:wrap;gap:14px;margin-top:32px}
.contact .small{margin-top:26px;color:#ffe3e6;font-size:14.5px;max-width:640px;margin-inline:auto}

/* ---------- Chân trang ---------- */
footer{background:var(--navy-d);color:#c5d0ee;padding:0 0 48px;font-size:14.5px;position:relative}
footer::before{content:"";display:block;height:14px;background:var(--hoavan) repeat-x,var(--red);margin-bottom:44px}
footer .wrap{display:grid;grid-template-columns:1.4fr 1fr;gap:30px}
footer .brand{color:#fff}
footer .brand small{color:var(--gold)}
footer h4{color:var(--gold);font-size:14px;letter-spacing:.1em;text-transform:uppercase;margin-bottom:10px}
footer a:hover{color:var(--gold)}
footer li+li{margin-top:6px}
.privacy{display:flex;flex-wrap:wrap;gap:8px 16px;margin-top:14px}
.privacy span{display:inline-flex;align-items:center;gap:7px}
.privacy .ico{color:var(--gold);width:1em;height:1em;stroke-width:2.6}
.fnote{margin-top:14px;max-width:520px}

/* ---------- Trang kỹ sư trưởng ---------- */
.fhero{padding:calc(var(--nav-h) + 60px) 0 100px}
.fhero .wrap{display:grid;grid-template-columns:.85fr 1.15fr;gap:60px;align-items:center}
.portrait{position:relative;max-width:470px}
.portrait::before{content:"";position:absolute;inset:18px -18px -18px 18px;border:3px solid var(--gold);border-radius:18px}
.portrait img{position:relative;width:100%;aspect-ratio:3/2;object-fit:cover;object-position:50% 25%;border-radius:18px;border:4px solid #fff;box-shadow:10px 10px 0 var(--navy-d)}
.ribbon{position:absolute;z-index:2;left:-14px;bottom:22px;background:var(--gold);color:var(--red-d);font-weight:800;font-size:14px;padding:9px 18px 9px 16px;letter-spacing:.04em;text-transform:uppercase;border:2px solid var(--navy-d);box-shadow:4px 4px 0 var(--navy-d)}
.fhero .role{font-size:14px;letter-spacing:.16em;text-transform:uppercase;color:var(--gold);font-weight:800}
.fhero h1{color:#fff;font-size:clamp(34px,5vw,58px);margin-top:12px;line-height:1.1}
.fhero h1 span{display:block;font-size:.5em;color:#ffe9ad;font-weight:600;margin-bottom:6px}
.fhero p.lede{margin-top:22px;color:#ffeef0;font-size:clamp(17px,1.5vw,19.5px);max-width:620px}
.quote{margin:30px 0 0;padding:20px 24px;border-left:6px solid var(--gold);background:rgba(0,0,0,.18);border-radius:0 12px 12px 0;color:#fff;font-family:var(--serif);font-size:clamp(18px,1.8vw,22px);line-height:1.55;font-style:italic;max-width:620px}
.quote cite{display:block;margin-top:8px;font-style:normal;font-family:var(--sans);font-size:14px;color:var(--gold);font-weight:600}
.facts{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.did{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.tl{position:relative;max-width:860px;margin:0 auto;padding-left:34px}
.tl::before{content:"";position:absolute;left:11px;top:6px;bottom:6px;width:4px;background:repeating-linear-gradient(var(--red) 0 10px,transparent 10px 16px)}
.tl li{position:relative;padding:0 0 30px 22px}
.tl li::before{content:"";position:absolute;left:-31px;top:6px;width:18px;height:18px;border-radius:50%;background:var(--gold);border:4px solid var(--red)}
.tl .when{font-size:13px;letter-spacing:.12em;text-transform:uppercase;color:var(--red);font-weight:800}
.tl h3{font-size:19px;margin:3px 0 5px}
.tl p{color:var(--muted);font-size:16px}
.tenets{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.tenet{background:#fff;border:2px solid var(--line);border-radius:14px;padding:28px;position:relative;overflow:hidden}
.tenet .no{font-size:64px;font-weight:800;color:var(--red-l);line-height:.9;position:absolute;right:16px;top:10px}
.tenet h3{position:relative;font-size:20px;margin-bottom:10px;padding-top:6px}
.tenet p{position:relative;color:var(--muted);font-size:16px}
.tenet.b2 .no{color:var(--blue-l)}.tenet.b3 .no{color:var(--gold-l)}

/* ---------- 404 ---------- */
.nf{min-height:100vh;display:grid;place-items:center;text-align:center;padding:40px 20px}
.nf h1{font-size:clamp(70px,16vw,150px);line-height:1;color:var(--red)}
.nf p{color:var(--muted);margin:14px 0 30px}

/* ---------- Responsive ---------- */
@media (max-width:1100px){
  .burger{display:grid}
  .menu{position:fixed;top:var(--nav-h);left:0;right:0;flex-direction:column;align-items:stretch;gap:2px;padding:14px 16px 22px;background:#fff;border-bottom:4px solid var(--red);box-shadow:0 4px 0 var(--gold);transform:translateY(-12px);opacity:0;visibility:hidden;transition:all .25s}
  .menu.open{transform:none;opacity:1;visibility:visible}
  .menu a{padding:14px;font-size:17px}
  .menu a.active::after{display:none}
  .menu .cta{margin:8px 0 0;text-align:center;justify-content:center}
}
@media (max-width:1020px){
  .hero .wrap,.fhero .wrap{grid-template-columns:1fr;gap:46px}
  .feat{grid-template-columns:1fr}
  .tabs{position:static;flex-direction:row;overflow-x:auto;scrollbar-width:thin}
  .tab{flex:none;white-space:nowrap}
  .sec-grid,.res{grid-template-columns:1fr}
  .three,.six,.steps3,.arch-note,.did,.tenets{grid-template-columns:1fr 1fr}
  .stats .grid,.facts{grid-template-columns:1fr 1fr}
  .portrait{margin-inline:12px 24px}
}
@media (max-width:760px){
  body{font-size:16.5px}
  section{padding:68px 0}
  .wrap{padding:0 16px}
  .burger{display:grid}
  .menu{position:fixed;top:var(--nav-h);left:0;right:0;flex-direction:column;align-items:stretch;gap:2px;padding:14px 16px 22px;background:#fff;border-bottom:4px solid var(--red);transform:translateY(-12px);opacity:0;visibility:hidden;transition:all .25s}
  .menu.open{transform:none;opacity:1;visibility:visible}
  .menu a{padding:14px;font-size:17px}
  .menu a.active::after{display:none}
  .menu .cta{margin:8px 0 0;text-align:center;justify-content:center}
  .three,.six,.steps3,.arch-note,.mini-grid,.did,.tenets,.stats .grid,.facts{grid-template-columns:1fr}
  .stats{margin-top:-40px}
  .panel{padding:22px 18px}
  .bar{grid-template-columns:96px 1fr 48px;font-size:13px}
  .chat{min-height:400px}
  .win{box-shadow:6px 6px 0 var(--navy-d)}
  .slides{grid-template-columns:1fr 1fr}
  .scan-frame{grid-template-columns:1fr}.arrow-mid{transform:rotate(90deg)}
  .contact .box{padding:44px 20px}
  footer .wrap{grid-template-columns:1fr}
  .arch{padding:14px}
  .steps3 .card::before{left:20px}
  .portrait::before{inset:12px -10px -12px 12px}
  .portrait{margin-inline:6px 14px}
  .brand{font-size:15.5px}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.001ms!important;animation-iteration-count:1!important;transition-duration:.001ms!important}
  .rv{opacity:1;transform:none}
}
.bar em{font-style:normal}
.bw10{--w:100%}.bw098{--w:98.1%}.bw07{--w:70%}.bw068{--w:67.5%}.bw022{--w:21.8%}

/* ====== Minh hoạ, poster, chuyển cảnh ====== */
@view-transition{navigation:auto}
::view-transition-old(root){animation:vt-out .28s ease both}
::view-transition-new(root){animation:vt-in .42s cubic-bezier(.2,.7,.2,1) both}
@keyframes vt-out{to{opacity:0;transform:translateY(-8px)}}
@keyframes vt-in{from{opacity:0;transform:translateY(14px)}}

.progress{position:absolute;left:0;right:0;bottom:-8px;height:4px;background:linear-gradient(90deg,var(--red),var(--gold));transform:scaleX(0);transform-origin:0 50%;z-index:2;border-radius:0 4px 4px 0}

/* dải slogan chạy */
.marquee{overflow:hidden;background:var(--gold);border-block:3px solid var(--navy-d);transform:rotate(-1.2deg);margin:34px -20px 0;position:relative;z-index:3}
.mq-track{display:flex;align-items:center;gap:26px;width:max-content;padding:13px 0;animation:mq 38s linear infinite}
.mq-track span{font-size:clamp(15px,1.7vw,19px);font-weight:800;letter-spacing:.14em;color:var(--navy-d);white-space:nowrap}
.mq-track i{width:12px;height:12px;background:var(--red);transform:rotate(45deg);flex:none;border:2px solid var(--navy-d)}
@keyframes mq{to{transform:translateX(-50%)}}

/* huy hiệu dán kiểu poster */
.hero-visual{position:relative}
.sticker{position:absolute;z-index:3;font-weight:700;font-size:13.5px;line-height:1.25;text-align:center;color:var(--navy-d)}
.sticker.s1{top:-34px;right:-20px;width:112px;height:112px;border-radius:50%;background:var(--gold);border:3px solid var(--navy-d);box-shadow:4px 4px 0 var(--navy-d);display:flex;flex-direction:column;align-items:center;justify-content:center;transform:rotate(12deg);animation:wob 5s ease-in-out infinite}
.sticker.s1 b{font-size:28px;line-height:1;color:var(--red-d);font-weight:800}
.sticker.s2{left:-26px;bottom:62px;background:#fff;border:3px solid var(--navy-d);border-radius:10px;padding:10px 14px;box-shadow:4px 4px 0 var(--navy-d);display:flex;align-items:center;gap:10px;text-align:left;transform:rotate(-5deg);animation:wob 6s ease-in-out infinite reverse}
.sticker.s2 .ico{width:28px;height:28px;padding:5px;background:var(--green);color:#fff;border-radius:50%;stroke-width:3}
@keyframes wob{50%{transform:rotate(7deg) translateY(-6px)}}

/* tranh minh hoạ */
.art{display:grid;place-items:center;margin:-34px -34px 26px;padding:18px 20px;background:var(--cream2);background-image:radial-gradient(circle at 15% 20%,rgba(255,199,44,.35) 0 60px,transparent 61px),radial-gradient(circle at 90% 90%,rgba(37,99,235,.14) 0 80px,transparent 81px);border-bottom:2px solid var(--line);border-radius:14px 14px 0 0;position:relative;overflow:hidden}
.art::after{content:"";position:absolute;left:0;right:0;bottom:0;height:8px;background:var(--hoavan) repeat-x,var(--red)}
.art svg{width:min(100%,380px);height:auto;aspect-ratio:360/200}
.panel:not([hidden]) .art svg{animation:pop .7s cubic-bezier(.2,.9,.3,1.2) both}
@keyframes pop{from{opacity:0;transform:scale(.86) translateY(10px)}}
.art-s{margin:-34px -28px 18px;padding:12px;border-radius:10px 10px 0 0}
.art-s svg{width:min(100%,250px)}
.card .art-s{margin-top:-34px}
.steps3 .card{padding-top:28px}
.sec-art{border:3px solid var(--gold);border-radius:16px;background:rgba(255,255,255,.08);padding:10px;display:grid;place-items:center}
.sec-art svg{width:min(100%,380px);height:auto}
.art-m{width:min(100%,260px);margin:-6px auto 6px;height:auto}

/* chuyển tab mượt */
.tabs{position:sticky}
.tab-ind{position:absolute;left:0;top:0;background:var(--red);border-radius:9px;box-shadow:3px 3px 0 var(--gold);transition:transform .38s cubic-bezier(.3,.8,.25,1),width .38s cubic-bezier(.3,.8,.25,1),height .38s cubic-bezier(.3,.8,.25,1);z-index:0;pointer-events:none}
.tab{position:relative;z-index:1}
.tabs.has-ind .tab[aria-selected="true"]{background:transparent;box-shadow:none}
.tab{transition:color .25s,background .25s}
.panel{animation:none}
.panel:not([hidden]){animation:panin .5s cubic-bezier(.2,.7,.2,1) both}
.panel.out{animation:panout .18s ease both}
@keyframes panin{from{opacity:0;transform:translateX(26px)}}
@keyframes panout{to{opacity:0;transform:translateX(-18px)}}
.panel:not([hidden]) .bul li{animation:li .5s cubic-bezier(.2,.7,.2,1) both}
.panel:not([hidden]) .bul li:nth-child(1){animation-delay:.12s}.panel:not([hidden]) .bul li:nth-child(2){animation-delay:.2s}.panel:not([hidden]) .bul li:nth-child(3){animation-delay:.28s}.panel:not([hidden]) .bul li:nth-child(4){animation-delay:.36s}
.panel:not([hidden]) .demo{animation:li .6s .42s cubic-bezier(.2,.7,.2,1) both}
@keyframes li{from{opacity:0;transform:translateY(12px)}}
.panel{padding-top:0;overflow:hidden}
.panel>:not(.art){position:relative}
.panel h3{padding-top:0}
.panel .intro{margin-top:10px}
.panel>h3,.panel>.intro,.panel>.bul,.panel>.demo{margin-left:34px;margin-right:34px}
.panel>.demo{margin-bottom:34px}
.panel>.art{margin:0 0 26px;border-radius:0}
@media (max-width:1020px){.tab-ind{display:none}.tabs.has-ind .tab[aria-selected="true"]{background:var(--red);box-shadow:3px 3px 0 var(--gold)}}
@media (max-width:760px){.panel>h3,.panel>.intro,.panel>.bul,.panel>.demo{margin-left:18px;margin-right:18px}.sticker.s1{right:-6px;top:-30px;width:92px;height:92px;font-size:11.5px}.sticker.s1 b{font-size:22px}.sticker.s2{left:-6px;bottom:40px;font-size:12px}.marquee{margin-inline:-16px}}
@media (prefers-reduced-motion:reduce){.mq-track{animation:none}.sticker{animation:none}}
.panel{padding:0}
.steps3 .card{padding-top:0}
.art-s,.card .art-s{margin:0 -28px 18px}
.steps3 .card::before{z-index:2}

/* ====== Gia cố cho trình duyệt di động ====== */
html{overflow-x:clip;-webkit-tap-highlight-color:transparent}
.wrap{padding-left:max(20px,env(safe-area-inset-left));padding-right:max(20px,env(safe-area-inset-right))}
footer{padding-bottom:calc(48px + env(safe-area-inset-bottom))}
.nf{min-height:100vh;min-height:100svh}
.pill b{white-space:nowrap}
.rv{transition-duration:.55s}
.tabs{-webkit-overflow-scrolling:touch;overscroll-behavior-x:contain}
@media (max-width:1020px){.tabs{scroll-snap-type:x proximity}.tab{scroll-snap-align:center;min-height:48px}}
@media (max-width:760px){
  .wrap{padding-left:max(16px,env(safe-area-inset-left));padding-right:max(16px,env(safe-area-inset-right))}
  .pill{font-size:13.5px;padding:6px 14px 6px 6px;align-items:flex-start}
  .hero{padding-top:calc(var(--nav-h) + 40px);padding-bottom:90px}
  .hero .actions{flex-direction:column;align-items:stretch}
  .hero .actions .btn,.contact .actions .btn{justify-content:center}
  .contact .actions{flex-direction:column;align-items:stretch}
  .hero::before{width:520px;height:520px;right:-240px;top:-80px}
  .art{margin:0 0 20px}
  .art svg{width:min(100%,320px)}
  .panel>.art{margin-bottom:20px}
  .h2{font-size:clamp(26px,7.4vw,34px)}
  .marquee{transform:rotate(-1.6deg)}
  .stat{padding:20px 18px}
  .portrait::before{display:none}
  .ribbon{left:8px}
  .tl{padding-left:26px}
  .tl li{padding-left:16px}
  .tl li::before{left:-26px}
  .tenet{padding:22px}
  .win-bar span{font-size:12.5px}
  .chat{padding:16px 14px;min-height:0}
  .msg-u,.bubble{font-size:14.5px}
}
@media (hover:none){.card:hover{transform:none;box-shadow:0 2px 0 rgba(14,42,107,.05)}.btn-primary:hover,.btn-red:hover{transform:none;box-shadow:4px 4px 0 var(--navy-d)}}

/* ====== v3: gọn hơn, màu đặc rực rỡ ====== */
.bg-red{background:#2563eb}.bg-blue{background:#0284c7}.bg-green{background:#15803d}.bg-gold{background:#ffc531}.bg-orange{background:#d9480f}.bg-teal{background:#7c3aed}.bg-navy{background:#10245c}.bg-pink{background:#db2777}
section{padding:64px 0}
.sec-head{margin-bottom:30px}
.h2{margin-top:10px}
.hero{background:radial-gradient(560px 400px at 8% 108%,rgba(255,197,49,.55),transparent 70%),radial-gradient(620px 440px at 92% -10%,rgba(236,72,153,.55),transparent 70%),radial-gradient(700px 500px at 60% 120%,rgba(6,182,212,.55),transparent 70%),linear-gradient(135deg,#1d4ed8 0%,#2563eb 50%,#0891b2 100%)}
.hero{padding-bottom:96px}

/* ô số liệu màu đặc */
.sgrid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.stile{border-radius:14px;padding:22px 22px 20px;color:#fff;border:3px solid var(--navy-d);box-shadow:5px 5px 0 var(--navy-d)}
.stile .num{font-size:clamp(36px,4vw,50px);font-weight:800;line-height:1}
.stile .num small{font-size:.5em;font-weight:700}
.stile .lbl{margin-top:8px;font-size:15px;line-height:1.45;color:rgba(255,255,255,.94)}
.stile.bg-gold{color:var(--navy-d)}.stile.bg-gold .lbl{color:var(--navy-d)}
.stats{padding-bottom:6px}
.marquee{margin-top:30px;margin-bottom:-8px}

/* khối chức năng: tab ngang + một khung duy nhất */
.ftabs{display:flex;flex-wrap:wrap;justify-content:center;gap:8px}
.ft{display:inline-flex;align-items:center;gap:8px;padding:9px 16px;min-height:46px;border-radius:999px;border:2px solid var(--navy);background:#fff;color:var(--navy);font-weight:700;font-size:15px;transition:background .2s,color .2s,transform .2s,box-shadow .2s;white-space:nowrap}
.ft .ico{color:var(--red)}
.ft:hover{background:var(--cream2)}
.ft[aria-selected="true"]{background:var(--red);border-color:var(--red-d);color:#fff;box-shadow:3px 3px 0 var(--gold);transform:translate(-1px,-1px)}
.ft[aria-selected="true"] .ico{color:var(--gold)}
.fstage{margin-top:26px;border:3px solid var(--navy-d);border-radius:20px;overflow:hidden;box-shadow:8px 8px 0 var(--navy-d);background:#fff}
.fpanel{display:grid;grid-template-columns:42% 58%;min-height:440px}
.fpanel[hidden]{display:none}
.fart{display:grid;place-items:center;padding:24px;position:relative;overflow:hidden}
.fart::before{content:"";position:absolute;inset:0;background:repeating-radial-gradient(circle at 85% 12%,rgba(255,255,255,.16) 0 2px,transparent 2px 26px)}
.fart svg{position:relative;width:min(100%,420px);height:auto;aspect-ratio:360/200}
.fbody{padding:30px 34px 30px}
.fbody h3{font-size:clamp(21px,2.4vw,28px)}
.fbody .hl{color:var(--red)}
.fbody .intro{margin-top:10px;color:var(--muted);font-size:16.5px}
.fbody .bul{margin-top:16px;gap:10px}
.fbody .bul li{font-size:15.5px}
.fbody .demo{margin-top:18px;padding:14px}
.fpanel:not([hidden]){animation:panin .5s cubic-bezier(.2,.7,.2,1) both}
.fpanel:not([hidden]) .fart svg{animation:pop .7s .05s cubic-bezier(.2,.9,.3,1.2) both}
.fpanel:not([hidden]) .bul li{animation:li .5s cubic-bezier(.2,.7,.2,1) both}
.fpanel:not([hidden]) .bul li:nth-child(1){animation-delay:.1s}.fpanel:not([hidden]) .bul li:nth-child(2){animation-delay:.18s}.fpanel:not([hidden]) .bul li:nth-child(3){animation-delay:.26s}
.fpanel:not([hidden]) .demo{animation:li .6s .34s cubic-bezier(.2,.7,.2,1) both}
.fpanel.out,.rpanel.out{animation:panout .18s ease both}
.rpanel{animation:none}.rpanel:not([hidden]){animation:panin .5s cubic-bezier(.2,.7,.2,1) both}
.rpanel[hidden]{display:none}
.fstage2{margin-top:26px}
.ftabs-s{margin-top:0}

/* ô "khác biệt" màu đặc */
.tiles{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.tile{border-radius:16px;padding:24px 24px 26px;color:#fff;position:relative;overflow:hidden;border:3px solid var(--navy-d);box-shadow:5px 5px 0 var(--navy-d);transition:transform .2s,box-shadow .2s}
.tile:hover{transform:translate(-3px,-3px);box-shadow:8px 8px 0 var(--navy-d)}
.tile .tn{position:absolute;right:16px;top:8px;font-size:60px;font-weight:800;line-height:1;color:rgba(255,255,255,.18)}
.tile .tic{width:48px;height:48px;border-radius:14px;background:#fff;color:var(--navy);display:grid;place-items:center;border:2px solid var(--navy-d)}
.tile h3{color:#fff;font-size:19px;margin:16px 0 8px}
.tile p{color:rgba(255,255,255,.92);font-size:15px;line-height:1.55}

/* bảo mật gọn */
#bao-mat .sec-head{margin-bottom:28px}
.sec-grid{gap:26px}
.layer{padding:14px 16px}
.layers{gap:10px}
.layer h4{font-size:16px}
.layer p{font-size:14.5px}
.layer .ico-box{width:40px;height:40px;flex:none}
.sec-right{display:grid;gap:18px}
.sec-art{padding:6px}
.sec-art svg{width:min(100%,300px)}
.clr{padding:20px 22px}

.arch{padding:22px}
.arch-note{margin-top:16px}
.contact .box{padding:44px 36px}
.art-m{width:min(100%,200px)}
.path{list-style:none;display:flex;flex-wrap:wrap;gap:12px;justify-content:center;margin:22px 0 0;padding:0}
.path li{display:flex;align-items:center;gap:10px;background:rgba(0,0,0,.18);border:2px solid var(--gold);border-radius:999px;padding:7px 18px 7px 7px;color:#fff;font-weight:700;font-size:15px}
.path li b{width:30px;height:30px;border-radius:50%;background:var(--gold);color:var(--red-d);display:grid;place-items:center}
.contact .actions{margin-top:24px}
.contact .small{margin-top:20px}
footer::before{margin-bottom:34px}

@media (max-width:1020px){
  .sgrid{grid-template-columns:1fr 1fr}
  .tiles{grid-template-columns:1fr 1fr}
  .fpanel{grid-template-columns:1fr}
  .fart{padding:18px}
  .fart svg{width:min(100%,320px)}
  .fbody{padding:24px 22px}
}
@media (max-width:760px){
  section{padding:48px 0}
  .sgrid,.tiles{grid-template-columns:1fr}
  .stile{padding:18px}
  .ftabs{flex-wrap:nowrap;justify-content:flex-start;overflow-x:auto;scroll-snap-type:x proximity;padding:4px 2px 10px;margin-inline:-16px;padding-inline:16px;scrollbar-width:none}
  .ftabs::-webkit-scrollbar{display:none}
  .ft{flex:none;scroll-snap-align:center}
  .ftabs-s{justify-content:center;flex-wrap:wrap;overflow:visible}
  .fstage{box-shadow:5px 5px 0 var(--navy-d);border-radius:16px}
  .tile{box-shadow:4px 4px 0 var(--navy-d)}
  .path{flex-direction:column;align-items:stretch}
  .contact .box{padding:34px 18px}
}

.ftabs{max-width:980px;margin-inline:auto}
.tenets .tenet{border:3px solid var(--navy-d);box-shadow:5px 5px 0 var(--navy-d)}

/* ====== v4: bảng màu tươi sáng ====== */
.tile.bg-teal .tic{color:var(--violet)}
.tile.bg-red .tic{color:#2563eb}.tile.bg-orange .tic{color:var(--orange)}.tile.bg-green .tic{color:var(--green)}.tile.bg-blue .tic{color:var(--blue)}
.fart.bg-red{background:linear-gradient(135deg,#2563eb,#38bdf8)}
.fart.bg-blue{background:linear-gradient(135deg,#0284c7,#22d3ee)}
.fart.bg-gold{background:linear-gradient(135deg,#ffc531,#ff9f43)}
.fart.bg-green{background:linear-gradient(135deg,#15a34a,#4ade80)}
.fart.bg-orange{background:linear-gradient(135deg,#f97316,#fb7185)}
.fart.bg-navy{background:linear-gradient(135deg,#1e3a8a,#6366f1)}
.fart.bg-teal{background:linear-gradient(135deg,#7c3aed,#ec4899)}
.stile.bg-red{background:linear-gradient(135deg,#2563eb,#0ea5e9)}
.stile.bg-blue{background:linear-gradient(135deg,#7c3aed,#a855f7)}
.stile.bg-green{background:linear-gradient(135deg,#059669,#10b981)}
.stile.bg-gold{background:linear-gradient(135deg,#ffc531,#ff9f43)}
.tile.bg-red{background:linear-gradient(135deg,#2563eb,#3b82f6)}
.tile.bg-blue{background:linear-gradient(135deg,#0284c7,#06b6d4)}
.tile.bg-green{background:linear-gradient(135deg,#15803d,#22c55e)}
.tile.bg-orange{background:linear-gradient(135deg,#ea580c,#f97316)}
.tile.bg-teal{background:linear-gradient(135deg,#7c3aed,#c026d3)}
.tile.bg-navy{background:linear-gradient(135deg,#1e3a8a,#4f46e5)}
.marquee{background:linear-gradient(90deg,#ffc531,#ffd95e,#ffc531)}
.mq-track i{background:var(--pink)}
.fill.hi{background:linear-gradient(90deg,#2563eb,#06b6d4)}
.big .n{background:linear-gradient(90deg,#2563eb,#06b6d4);-webkit-background-clip:text;background-clip:text;color:transparent}
.big .card:nth-child(2) .n{background:linear-gradient(90deg,#15803d,#22c55e);-webkit-background-clip:text;background-clip:text;color:transparent}
body{background:var(--cream)}

/* ====== đổi tab không làm trang nhảy ====== */
.ftabs{position:relative;scroll-snap-type:none!important}
.ft{scroll-snap-align:none!important}
.fstage,.fstage2{overflow-anchor:none;transition:height .38s cubic-bezier(.2,.7,.2,1)}
.fstage2{overflow:hidden}
.fpanel,.rpanel{overflow-anchor:none}
@keyframes panin{from{opacity:0;transform:translateY(10px)}}
@keyframes panout{to{opacity:0;transform:translateY(-6px)}}
.fstage2{padding:8px 4px 14px;margin:18px -4px 0}

/* khung chat minh hoạ: giữ chỗ cố định, không đổi chiều cao khi chữ tự gõ */
.bubble{position:relative}
.bubble .ghost{display:block;visibility:hidden;pointer-events:none}
.bubble .live{position:absolute;left:16px;right:16px;top:13px}
.src{visibility:hidden;opacity:0;transition:opacity .3s}
.src.show{visibility:visible;opacity:1}
.msg-u{min-height:calc(2 * 1.65 * 15.5px + 24px)}
.chat{min-height:0}
.steps{min-height:34px}

/* nhãn "Ngoài đề tài / Trong đề tài" trên dòng thời gian */
.tl .when{display:flex;flex-wrap:wrap;align-items:center;gap:10px}
.tl .tg{font-size:11.5px;letter-spacing:.06em;text-transform:none;font-weight:700;padding:2px 10px;border-radius:999px;border:2px solid var(--line);color:var(--muted);background:#fff}
.tl .tg-self{color:#fff;background:linear-gradient(135deg,#7c3aed,#ec4899);border-color:transparent}
.tl li.self::before{background:#7c3aed;border-color:#ec4899;width:22px;height:22px;left:-33px;top:4px}
.tl li.self h3{color:#7c3aed}