/* =========================================================
   Hong Chiang Technology – Bản tiếng Việt
   Theme: Tech / Dark  ·  Dùng chung cho mọi trang
   ========================================================= */
:root{
  --bg:#05080f; --bg2:#0a101c; --panel:#0e1626; --panel2:#111c30; --line:#1b2a42;
  --text:#e6edf7; --muted:#8a9bb5; --cyan:#22d3ee; --blue:#3b82f6; --violet:#8b5cf6; --green:#34d399; --amber:#fbbf24;
  --grad:linear-gradient(120deg,var(--cyan),var(--blue) 50%,var(--violet));
  --mono:'JetBrains Mono',ui-monospace,monospace;
  --radius:18px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:'Be Vietnam Pro',system-ui,sans-serif;background:var(--bg);color:var(--text);line-height:1.65;overflow-x:hidden}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
.wrap{max-width:1200px;margin:0 auto;padding:0 20px}
.grid-bg{position:fixed;inset:0;z-index:-1;background:
  radial-gradient(circle at 15% 10%,rgba(34,211,238,.12),transparent 40%),
  radial-gradient(circle at 85% 30%,rgba(139,92,246,.12),transparent 45%),
  linear-gradient(var(--line) 1px,transparent 1px) 0 0/48px 48px,
  linear-gradient(90deg,var(--line) 1px,transparent 1px) 0 0/48px 48px;
  opacity:.5;mask-image:linear-gradient(#000,transparent 80%);-webkit-mask-image:linear-gradient(#000,transparent 80%)}
.mono{font-family:var(--mono)}
.grad{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.muted{color:var(--muted)}
.tag{display:inline-flex;align-items:center;gap:8px;font-family:var(--mono);font-size:12px;letter-spacing:.12em;text-transform:uppercase;color:var(--cyan);border:1px solid rgba(34,211,238,.35);padding:6px 12px;border-radius:999px;background:rgba(34,211,238,.06)}
.tag::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--cyan);box-shadow:0 0 10px var(--cyan);animation:pulse 1.6s infinite}
@keyframes pulse{50%{opacity:.3}}
h1,h2,h3,h4{letter-spacing:-.015em;line-height:1.2}
h2{font-size:clamp(26px,3.6vw,40px);font-weight:800;margin:14px 0 12px}
.lead{color:var(--muted);max-width:720px;font-size:17px}
section{padding:80px 0;position:relative}
.sec-head{margin-bottom:40px}
.center{text-align:center}.center .lead{margin:0 auto}

/* ---------- Buttons ---------- */
.btn{display:inline-flex;align-items:center;gap:8px;padding:12px 22px;border-radius:10px;font-weight:600;font-size:14px;transition:.25s;border:none;cursor:pointer;font-family:inherit}
.btn-primary{background:var(--grad);color:#020617;box-shadow:0 8px 30px -8px rgba(59,130,246,.6)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 12px 40px -8px rgba(34,211,238,.7)}
.btn-ghost{border:1px solid var(--line);background:rgba(255,255,255,.02);color:var(--text)}
.btn-ghost:hover{border-color:var(--cyan);color:var(--cyan)}
.btn-row{display:flex;gap:14px;flex-wrap:wrap;margin-top:28px}

/* ---------- Header / Nav ---------- */
header.site{position:sticky;top:0;z-index:50;backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);background:rgba(5,8,15,.78);border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;justify-content:space-between;height:68px;gap:16px}
.logo{display:flex;align-items:center;gap:10px;font-weight:800;letter-spacing:.02em;white-space:nowrap}
.logo-mark{width:34px;height:34px;border-radius:9px;background:var(--grad);display:grid;place-items:center;font-family:var(--mono);font-size:14px;color:#020617;font-weight:700}
.logo small{display:block;font-size:10px;font-weight:500;color:var(--muted);letter-spacing:.18em;font-family:var(--mono)}
.menu{display:flex;gap:4px;font-size:14px;color:var(--muted);align-items:center}
.menu>li{list-style:none;position:relative}
.menu>li>a{display:block;padding:8px 12px;border-radius:8px}
.menu>li>a:hover,.menu>li>a.active{color:var(--text);background:rgba(255,255,255,.04)}
.menu>li>a.active{color:var(--cyan)}
.has-sub>a::after{content:" ▾";font-size:10px}
.sub{position:absolute;top:100%;left:0;min-width:270px;background:var(--bg2);border:1px solid var(--line);border-radius:14px;padding:8px;opacity:0;visibility:hidden;transform:translateY(6px);transition:.2s;box-shadow:0 20px 50px -20px #000}
.has-sub:hover .sub,.has-sub:focus-within .sub{opacity:1;visibility:visible;transform:none}
.sub a{display:block;padding:9px 12px;border-radius:8px;font-size:13.5px}
.sub a:hover{background:rgba(34,211,238,.08);color:var(--cyan)}
.burger{display:none;background:none;border:1px solid var(--line);color:var(--text);border-radius:8px;width:40px;height:40px;font-size:18px;cursor:pointer}

/* ---------- Page hero ---------- */
.page-hero{padding:64px 0 48px;border-bottom:1px solid var(--line)}
.crumb{font-family:var(--mono);font-size:12px;color:var(--muted);margin-bottom:18px}
.crumb a:hover{color:var(--cyan)}
.crumb span{margin:0 8px;opacity:.5}
.page-hero h1{font-size:clamp(32px,5vw,56px);font-weight:800;letter-spacing:-.03em;margin:16px 0}
.page-hero .lead{font-size:18px}
.hero-kpis{display:flex;gap:36px;flex-wrap:wrap;margin-top:32px}
.hero-kpis div{font-family:var(--mono)}
.hero-kpis b{display:block;font-size:30px;font-weight:700}
.hero-kpis span{font-size:12px;color:var(--muted);font-family:'Be Vietnam Pro',system-ui,sans-serif;display:block;margin-top:4px}

/* ---------- Home hero ---------- */
.hero{padding:80px 0 60px}
.hero-grid{display:grid;grid-template-columns:1.05fr 1fr;gap:48px;align-items:center}
.hero h1{font-size:clamp(36px,5.6vw,64px);line-height:1.05;font-weight:800;letter-spacing:-.03em;margin:22px 0}
.hero p{color:var(--muted);font-size:18px;max-width:560px}
.badges{display:flex;gap:18px;margin-top:32px;flex-wrap:wrap;font-family:var(--mono);font-size:12px;color:var(--muted)}
.badges b{color:var(--green)}
.viz{position:relative;aspect-ratio:1/.9;border:1px solid var(--line);border-radius:22px;background:linear-gradient(160deg,rgba(14,22,38,.9),rgba(5,8,15,.9));overflow:hidden}
.viz::after{content:"";position:absolute;inset:0;background:linear-gradient(transparent 50%,rgba(34,211,238,.05) 50%) 0 0/100% 4px;pointer-events:none}
.viz svg{width:100%;height:100%}
.hud{position:absolute;font-family:var(--mono);font-size:11px;color:var(--cyan);background:rgba(5,8,15,.8);border:1px solid rgba(34,211,238,.3);padding:8px 10px;border-radius:8px;line-height:1.5}
.hud.a{top:16px;left:16px}.hud.b{bottom:16px;right:16px;color:var(--green);border-color:rgba(52,211,153,.35)}

/* ---------- Stats ---------- */
.stats{display:grid;grid-template-columns:repeat(5,1fr);border:1px solid var(--line);border-radius:var(--radius);background:var(--panel);overflow:hidden}
.stats.s4{grid-template-columns:repeat(4,1fr)}
.stat{padding:28px 20px;border-right:1px solid var(--line)}
.stat:last-child{border-right:none}
.stat .n{font-size:36px;font-weight:800;font-family:var(--mono);letter-spacing:-.03em}
.stat .l{color:var(--muted);font-size:13px;margin-top:4px}

/* ---------- Grids & Cards ---------- */
.g2{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}
.g3{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.g4{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.split{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center}
.card{position:relative;padding:28px;border:1px solid var(--line);border-radius:var(--radius);background:linear-gradient(180deg,var(--panel),var(--bg2));transition:.3s;overflow:hidden;display:flex;flex-direction:column}
.card::before{content:"";position:absolute;inset:-1px;border-radius:var(--radius);padding:1px;background:var(--grad);-webkit-mask:linear-gradient(#000 0 0) content-box,linear-gradient(#000 0 0);-webkit-mask-composite:xor;mask-composite:exclude;opacity:0;transition:.3s;pointer-events:none}
a.card:hover,.card.hover:hover{transform:translateY(-4px)}
a.card:hover::before,.card.hover:hover::before{opacity:1}
.card h3{font-size:19px;margin-bottom:8px}
.card p{color:var(--muted);font-size:14px}
.card .more{margin-top:auto;padding-top:16px;font-size:13px;font-weight:600;color:var(--cyan)}
.card ul.chips{list-style:none;margin-top:14px;display:flex;flex-wrap:wrap;gap:6px}
.chips li,.chip{font-size:12px;font-family:var(--mono);color:#b6c4da;border:1px solid var(--line);padding:4px 9px;border-radius:6px;display:inline-block}
.code{position:absolute;top:22px;right:22px;font-family:var(--mono);font-size:11px;color:#3b4d6b}
.ico{width:48px;height:48px;border-radius:12px;display:grid;place-items:center;background:rgba(34,211,238,.08);border:1px solid rgba(34,211,238,.25);margin-bottom:18px;flex:none}
.ico svg{width:24px;height:24px;stroke:var(--cyan);fill:none;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.label{font-family:var(--mono);font-size:11px;color:var(--cyan);text-transform:uppercase;letter-spacing:.12em}
.kpi{margin-top:14px;font-family:var(--mono);font-size:12px;color:var(--green)}

/* ---------- Specs ---------- */
.specs{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--line);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden}
.spec{background:var(--panel);padding:28px 24px}
.spec .k{font-family:var(--mono);font-size:11px;color:var(--muted);text-transform:uppercase;letter-spacing:.12em}
.spec .v{font-size:32px;font-weight:800;font-family:var(--mono);margin:8px 0}
.spec p{font-size:13px;color:var(--muted)}
.feat{display:flex;gap:14px;padding:20px;border:1px solid var(--line);border-radius:14px;background:rgba(14,22,38,.6)}
.feat .dot{flex:none;width:10px;height:10px;margin-top:7px;border-radius:3px;background:var(--grad)}
.feat h4{font-size:15px;margin-bottom:4px}
.feat p{font-size:13px;color:var(--muted)}

/* ---------- Steps ---------- */
.steps{display:grid;gap:14px;counter-reset:st}
.steps.h{grid-template-columns:repeat(4,1fr)}
.step{position:relative;padding:22px 22px 22px 70px;border:1px solid var(--line);border-radius:14px;background:var(--panel)}
.step::before{counter-increment:st;content:counter(st,decimal-leading-zero);position:absolute;left:20px;top:20px;font-family:var(--mono);font-weight:700;font-size:18px;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.step h4{font-size:15px;margin-bottom:4px}
.step p{font-size:13.5px;color:var(--muted)}

/* ---------- Tables ---------- */
.tbl-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:var(--radius);background:var(--panel)}
table.tbl{width:100%;border-collapse:collapse;font-size:14px;min-width:620px}
.tbl th,.tbl td{padding:14px 18px;text-align:left;border-bottom:1px solid var(--line);vertical-align:top}
.tbl th{font-family:var(--mono);font-size:11px;letter-spacing:.1em;text-transform:uppercase;color:var(--muted);background:var(--panel2)}
.tbl tr:last-child td{border-bottom:none}
.tbl td.hl{color:var(--green);font-weight:600}
.tbl td.bad{color:#f87171}

/* ---------- Compare (before/after) ---------- */
.vs{display:grid;grid-template-columns:1fr auto 1fr;gap:18px;align-items:stretch}
.vs .mid{display:grid;place-items:center;font-family:var(--mono);font-weight:700;color:var(--muted)}
.vs .card.good{border-color:rgba(52,211,153,.4)}
.vs ul{list-style:none;margin-top:12px;display:grid;gap:8px;font-size:14px}
.vs .good li::before{content:"✓ ";color:var(--green)}
.vs .bad li::before{content:"✕ ";color:#f87171}

/* ---------- Quote / Case ---------- */
.quote{border-left:3px solid var(--cyan);padding:6px 0 6px 18px;font-size:16px;font-style:italic;color:#cfd8e6;margin:16px 0}
.quote cite{display:block;font-style:normal;font-size:12px;color:var(--muted);margin-top:8px;font-family:var(--mono)}
.case-meta{display:flex;gap:8px;flex-wrap:wrap;margin:10px 0 4px}
.flag{font-family:var(--mono);font-size:11px;color:var(--amber)}

/* ---------- Filter ---------- */
.filters{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:28px}
.filters button{font-family:inherit;font-size:13px;padding:8px 14px;border-radius:999px;border:1px solid var(--line);background:var(--panel);color:var(--muted);cursor:pointer;transition:.2s}
.filters button:hover{color:var(--text)}
.filters button.on{background:var(--grad);color:#020617;border-color:transparent;font-weight:600}
[data-cat].hide{display:none}

/* ---------- FAQ ---------- */
.faq{display:grid;gap:12px}
.faq details{border:1px solid var(--line);border-radius:14px;background:var(--panel);padding:0 22px}
.faq summary{cursor:pointer;padding:18px 0;font-weight:600;list-style:none;display:flex;justify-content:space-between;gap:16px}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";font-family:var(--mono);color:var(--cyan);font-size:20px;line-height:1}
.faq details[open] summary::after{content:"–"}
.faq details p{color:var(--muted);padding-bottom:18px;font-size:14.5px}

/* ---------- Timeline ---------- */
.timeline{position:relative;display:grid;grid-template-columns:repeat(6,1fr);gap:16px}
.timeline::before{content:"";position:absolute;top:14px;left:0;right:0;height:2px;background:var(--grad);opacity:.6}
.tl{position:relative;padding-top:40px}
.tl::before{content:"";position:absolute;top:7px;left:0;width:16px;height:16px;border-radius:50%;background:var(--bg);border:2px solid var(--cyan);box-shadow:0 0 14px var(--cyan)}
.tl .y{font-family:var(--mono);font-weight:600;font-size:20px}
.tl h4{font-size:14px;margin:6px 0 4px}
.tl p{font-size:12.5px;color:var(--muted)}

/* ---------- Quality ---------- */
.q-row{display:flex;gap:16px;padding:18px;border:1px solid var(--line);border-radius:14px;background:var(--panel)}
.q-row .badge{flex:none;font-family:var(--mono);font-size:11px;padding:6px 10px;border-radius:8px;background:rgba(52,211,153,.1);color:var(--green);border:1px solid rgba(52,211,153,.3);height:fit-content}
.q-row h4{font-size:15px}
.q-row p{font-size:13px;color:var(--muted)}
.meters{padding:28px;border:1px solid var(--line);border-radius:var(--radius);background:var(--panel);font-family:var(--mono)}
.meter{margin-bottom:20px}.meter:last-child{margin-bottom:0}
.meter .row{display:flex;justify-content:space-between;font-size:13px;margin-bottom:8px}
.meter .row span:first-child{color:var(--muted)}
.bar{height:8px;border-radius:99px;background:#121d31;overflow:hidden}
.bar i{display:block;height:100%;width:0;background:var(--grad);border-radius:99px;transition:width 1.6s cubic-bezier(.2,.8,.2,1)}

/* ---------- Visual placeholder ---------- */
.visual{border:1px solid var(--line);border-radius:22px;background:linear-gradient(160deg,var(--panel),var(--bg));aspect-ratio:4/3;display:grid;place-items:center;overflow:hidden;position:relative}
.visual svg{width:80%;height:80%}
.visual .cap{position:absolute;bottom:14px;left:16px;font-family:var(--mono);font-size:11px;color:var(--muted)}

/* ---------- News ---------- */
.news{display:grid;gap:14px}
.news-item{display:grid;grid-template-columns:120px 1fr;gap:24px;padding:22px;border:1px solid var(--line);border-radius:14px;background:var(--panel);transition:.25s}
.news-item:hover{border-color:rgba(34,211,238,.4)}
.news-item time{font-family:var(--mono);font-size:13px;color:var(--cyan)}
.news-item h3{font-size:17px;margin-bottom:6px}
.news-item p{color:var(--muted);font-size:14px}

/* ---------- Forms ---------- */
.form{display:grid;gap:14px}
.form .row2{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.form label{font-size:13px;color:var(--muted);display:grid;gap:6px}
.form input,.form select,.form textarea{font-family:inherit;font-size:14px;color:var(--text);background:var(--bg);border:1px solid var(--line);border-radius:10px;padding:12px 14px;outline:none;transition:.2s;width:100%}
.form input:focus,.form select:focus,.form textarea:focus{border-color:var(--cyan);box-shadow:0 0 0 3px rgba(34,211,238,.15)}
.form textarea{min-height:120px;resize:vertical}
.form .note{font-size:12px;color:var(--muted)}
.form-ok{display:none;font-size:14px}

/* ---------- CTA / Contact ---------- */
.cta{border:1px solid var(--line);border-radius:24px;padding:56px;background:
 radial-gradient(circle at 0% 0%,rgba(34,211,238,.18),transparent 50%),
 radial-gradient(circle at 100% 100%,rgba(139,92,246,.2),transparent 50%),var(--panel);
 display:grid;grid-template-columns:1.2fr 1fr;gap:40px;align-items:center}
.contact-box{display:grid;gap:12px;font-size:14px}
.contact-box div{display:flex;gap:12px;padding:14px;border-radius:12px;background:rgba(5,8,15,.6);border:1px solid var(--line)}
.contact-box b{font-family:var(--mono);font-size:11px;color:var(--cyan);min-width:80px;text-transform:uppercase;padding-top:2px}

/* ---------- Footer ---------- */
footer.site{border-top:1px solid var(--line);padding:56px 0 28px;color:var(--muted);font-size:14px;margin-top:40px;background:linear-gradient(transparent,rgba(14,22,38,.5))}
.foot-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.2fr;gap:32px}
.foot-grid h5{font-family:var(--mono);font-size:11px;letter-spacing:.14em;text-transform:uppercase;color:var(--text);margin-bottom:14px}
.foot-grid ul{list-style:none;display:grid;gap:8px}
.foot-grid a:hover{color:var(--cyan)}
.foot-bottom{display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap;border-top:1px solid var(--line);margin-top:40px;padding-top:20px;font-size:12px}
.to-top{position:fixed;right:20px;bottom:20px;width:44px;height:44px;border-radius:12px;background:var(--grad);color:#020617;display:grid;place-items:center;font-weight:800;opacity:0;pointer-events:none;transition:.3s;z-index:40}
.to-top.show{opacity:1;pointer-events:auto}

/* ---------- Reveal ---------- */
.reveal{opacity:0;transform:translateY(24px);transition:.8s cubic-bezier(.2,.8,.2,1)}
.reveal.in{opacity:1;transform:none}
.note-small{font-size:12px;color:var(--muted);margin-top:14px;font-style:italic}

/* ---------- Responsive ---------- */
@media(max-width:1080px){
  .menu{display:none}
  .burger{display:block}
  .nav .btn{display:none}
  .menu.open{display:flex;flex-direction:column;align-items:stretch;position:absolute;top:68px;left:0;right:0;background:var(--bg2);padding:16px 20px 24px;border-bottom:1px solid var(--line);max-height:calc(100vh - 68px);overflow:auto}
  .menu.open .sub{position:static;opacity:1;visibility:visible;transform:none;border:none;background:none;box-shadow:none;padding:0 0 0 14px;min-width:0}
}
@media(max-width:980px){
  .hero-grid,.split,.cta{grid-template-columns:1fr}
  .g3,.g4,.steps.h{grid-template-columns:1fr 1fr}
  .specs{grid-template-columns:1fr 1fr}
  .stats,.stats.s4{grid-template-columns:repeat(2,1fr)}
  .stat{border-bottom:1px solid var(--line)}
  .timeline{grid-template-columns:1fr 1fr;row-gap:28px}
  .timeline::before{display:none}
  .foot-grid{grid-template-columns:1fr 1fr}
  .vs{grid-template-columns:1fr}
  .vs .mid{padding:4px 0}
}
@media(max-width:600px){
  section{padding:60px 0}
  .g2,.g3,.g4,.specs,.timeline,.steps.h,.foot-grid,.form .row2{grid-template-columns:1fr}
  .cta{padding:28px}
  .stat .n{font-size:28px}
  .news-item{grid-template-columns:1fr;gap:8px}
}

/* =========================================================
   Công cụ cấu hình
   ========================================================= */
.cfg{display:grid;grid-template-columns:1.25fr 1fr;gap:22px;align-items:start}
.cfg .card{padding:26px}
.cfg-tabs{display:grid;grid-template-columns:repeat(3,1fr);gap:6px;padding:5px;background:var(--bg);border:1px solid var(--line);border-radius:12px;margin-bottom:8px}
.cfg-tabs button{display:flex;align-items:center;justify-content:center;gap:8px;font-family:inherit;font-size:14px;font-weight:600;padding:11px 8px;border-radius:9px;border:none;background:none;color:var(--muted);cursor:pointer;transition:.2s}
.cfg-tabs button:hover{color:var(--text)}
.cfg-tabs button.on{background:var(--grad);color:#020617}
.cfg-h{font-family:var(--mono);font-size:12px;letter-spacing:.12em;text-transform:uppercase;color:var(--cyan);margin:24px 0 12px;font-weight:600}
.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.cfg label,.form-grid label{font-size:13px;color:var(--muted);display:grid;gap:6px}
.cfg input[type=number],.cfg select{font-family:inherit;font-size:15px;color:var(--text);background:var(--bg);border:1px solid var(--line);border-radius:10px;padding:11px 12px;outline:none;width:100%;transition:.2s}
.cfg input:focus,.cfg select:focus{border-color:var(--cyan);box-shadow:0 0 0 3px rgba(34,211,238,.15)}
.inp-unit{position:relative;display:flex}
.inp-unit input{padding-right:92px!important}
.inp-unit .unit{position:absolute;right:12px;top:50%;transform:translateY(-50%);font-family:var(--mono);font-size:11px;color:var(--muted);pointer-events:none}
.hint{font-size:11.5px;color:#61718c}
.chk-row{display:flex;flex-wrap:wrap;gap:10px 22px;margin-top:16px}
.chk{display:flex!important;align-items:center;gap:8px;cursor:pointer;font-size:14px!important;color:var(--text)!important}
.chk input{width:18px;height:18px;accent-color:var(--cyan)}
.cfg-actions{margin-top:22px}
.cfg-out{position:sticky;top:88px;border-color:rgba(34,211,238,.35)!important;background:linear-gradient(180deg,rgba(34,211,238,.05),var(--bg2))!important}
.cfg-out-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:6px}
.cfg-code{font-size:12px;color:var(--muted)}
.cfg-items{list-style:none;display:grid;gap:12px;margin:14px 0 18px}
.cfg-items li{display:flex;gap:12px;padding:14px;border:1px solid var(--line);border-radius:12px;background:rgba(5,8,15,.55)}
.cfg-items .n{font-family:var(--mono);font-weight:700;font-size:13px;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent;padding-top:2px}
.cfg-items a{font-weight:600;font-size:15px}
.cfg-items a:hover{color:var(--cyan)}
.cfg-items .q{display:inline-block;margin-left:8px;font-family:var(--mono);font-size:12px;color:var(--green);font-weight:600}
.cfg-items p{font-size:13px;color:var(--muted);margin-top:3px}
.cfg-kpis{display:grid;grid-template-columns:1fr 1fr;gap:1px;background:var(--line);border:1px solid var(--line);border-radius:12px;overflow:hidden}
.cfg-kpis div{background:var(--panel);padding:12px 14px}
.cfg-kpis span{display:block;font-size:11.5px;color:var(--muted)}
.cfg-kpis b{font-family:var(--mono);font-size:14px}
.cfg-kpis div:last-child:nth-child(odd){grid-column:1/-1}
.cfg-payback{margin-top:14px;padding:18px;border-radius:12px;border:1px solid rgba(52,211,153,.35);background:rgba(52,211,153,.06)}
.cfg-payback span{display:block;font-size:12px;color:var(--muted);font-family:var(--mono);text-transform:uppercase;letter-spacing:.1em}
.cfg-payback b{display:block;font-size:26px;font-weight:800;font-family:var(--mono);margin:4px 0}
.cfg-payback small{font-size:12.5px;color:var(--muted)}

/* ---------- Trạng thái form ---------- */
.form-ok{margin-top:14px}
.form-ok.ok{display:block;padding:16px;border-radius:12px;background:rgba(52,211,153,.1);border:1px solid rgba(52,211,153,.35);color:var(--green)}
.form-ok.err{display:block;padding:16px;border-radius:12px;background:rgba(248,113,113,.08);border:1px solid rgba(248,113,113,.35);color:#fca5a5}
.form button[disabled]{opacity:.6;cursor:wait}
.hp{position:absolute!important;left:-9999px!important;width:1px;height:1px;overflow:hidden}

@media(max-width:980px){
  .cfg{grid-template-columns:1fr}
  .cfg-out{position:static}
}
@media(max-width:600px){
  .form-grid{grid-template-columns:1fr}
  .cfg-tabs button{font-size:13px;padding:10px 4px}
  .cfg-tabs button svg{display:none}
}

/* ---------- In / PDF ---------- */
@media print{
  body{background:#fff;color:#111}
  .grid-bg,header.site,footer.site,.to-top,.page-hero .btn-row,#gui-cau-hinh,.cfg-in,.cfg-out .btn-row{display:none!important}
  .page-hero{border:none;padding:0 0 12px}
  .page-hero h1{font-size:26px;color:#111}
  .grad{color:#0b5ed7!important;-webkit-text-fill-color:#0b5ed7;background:none}
  .cfg{display:block}
  .cfg-out{position:static;border:1px solid #ccc!important;background:#fff!important;color:#111}
  .cfg-items li,.cfg-kpis div,.cfg-payback{background:#fff!important;border-color:#ccc!important;color:#111}
  .cfg-items p,.cfg-kpis span,.note-small,.lead,.tag{color:#444!important}
  .reveal{opacity:1!important;transform:none!important}
  section{padding:0!important}
}
.form-grid{align-items:start}
@media(max-width:600px){.cfg-payback b{font-size:20px}}

/* =========================================================
   Thanh thông tin nhà phân phối + nút liên hệ nổi
   ========================================================= */
.topbar{background:linear-gradient(90deg,rgba(34,211,238,.12),rgba(139,92,246,.12));border-bottom:1px solid var(--line);font-size:12.5px;color:var(--muted)}
.topbar .wrap{display:flex;justify-content:space-between;gap:16px;align-items:center;min-height:34px;flex-wrap:wrap}
.topbar b{color:var(--text);font-weight:600}
.topbar .tb-r{display:flex;gap:18px;font-family:var(--mono)}
.topbar a:hover{color:var(--cyan)}
.foot-social{display:flex;gap:8px;flex-wrap:wrap;margin-top:14px}
.foot-social .chip:hover{border-color:var(--cyan);color:var(--cyan)}
.fab{position:fixed;left:16px;bottom:18px;z-index:45;display:flex;flex-direction:column;gap:10px}
.fab a{display:flex;align-items:center;gap:8px;height:46px;border-radius:999px;font-weight:700;box-shadow:0 10px 30px -8px rgba(0,0,0,.7);transition:.2s}
.fab a:hover{transform:translateY(-2px)}
.fab-zalo{width:46px;justify-content:center;background:#0068ff;color:#fff;font-size:12px}
.fab-call{padding:0 16px 0 6px;background:var(--grad);color:#020617}
.fab-call>span{width:34px;height:34px;border-radius:50%;display:grid;place-items:center;background:rgba(2,6,23,.15);animation:ring 1.6s infinite}
.fab-call b{font-family:var(--mono);font-size:14px}
@keyframes ring{0%,100%{transform:rotate(0)}10%,30%{transform:rotate(-14deg)}20%,40%{transform:rotate(14deg)}50%{transform:rotate(0)}}
.map{margin-top:18px;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;aspect-ratio:16/10;background:var(--panel)}
.map iframe{width:100%;height:100%;border:0;filter:invert(.9) hue-rotate(180deg) saturate(.6)}
.maplink{color:var(--cyan);font-size:12.5px;font-family:var(--mono)}

/* =========================================================
   Ảnh sản phẩm + hiệu ứng nghiêng 3D
   ========================================================= */
.tilt{--rx:0deg;--ry:0deg;--gx:50%;--gy:50%;transform:perspective(900px) rotateX(var(--rx)) rotateY(var(--ry));transform-style:preserve-3d;transition:transform .5s cubic-bezier(.2,.8,.2,1),box-shadow .3s;will-change:transform}
.tilt.tilting{transition:transform .08s linear}
.reveal.tilt{transition:opacity .8s, transform .5s cubic-bezier(.2,.8,.2,1)}
.reveal.tilt:not(.in){transform:perspective(900px) translateY(24px)}
.glare{position:absolute;inset:0;pointer-events:none;background:radial-gradient(circle at var(--gx) var(--gy),rgba(255,255,255,.22),transparent 45%);opacity:0;transition:opacity .3s;mix-blend-mode:overlay;border-radius:inherit}
.tilting .glare{opacity:1}
.ph{position:relative;margin:0;border-radius:22px;overflow:hidden;border:1px solid var(--line);background:var(--panel);aspect-ratio:4/3;box-shadow:0 30px 60px -30px rgba(0,0,0,.9)}
.ph img{width:100%;height:100%;object-fit:cover;transform:translateZ(30px) scale(1.04)}
.ph figcaption{position:absolute;left:0;right:0;bottom:0;padding:28px 16px 12px;background:linear-gradient(transparent,rgba(5,8,15,.85));transform:translateZ(50px)}
.ph:hover{box-shadow:0 40px 80px -30px rgba(34,211,238,.35)}
.pcard{position:relative;display:flex;flex-direction:column;border:1px solid var(--line);border-radius:var(--radius);background:linear-gradient(180deg,var(--panel),var(--bg2));overflow:hidden}
.pcard:hover{border-color:rgba(34,211,238,.45);box-shadow:0 30px 60px -30px rgba(34,211,238,.35)}
.pimg{position:relative;aspect-ratio:4/3;overflow:hidden;background:#0a0f1a}
.pimg img{width:100%;height:100%;object-fit:cover;transition:transform .6s cubic-bezier(.2,.8,.2,1)}
.pcard:hover .pimg img{transform:scale(1.07)}
.pbody{padding:18px 20px 20px;display:flex;flex-direction:column;flex:1}
.pbody h3{font-size:17px;margin-bottom:6px}
.pbody p{color:var(--muted);font-size:13.5px}
.pbody .more{margin-top:auto;padding-top:12px;font-size:13px;font-weight:600;color:var(--cyan)}

/* =========================================================
   Khung 3D (Three.js)
   ========================================================= */
.viz.hc3d-on>svg{display:none}
.hc3d-canvas{position:absolute;inset:0;width:100%!important;height:100%!important;display:block;cursor:grab;touch-action:pan-y}
.hc3d-canvas:active{cursor:grabbing}
.viz .hud,.v3d .hud{z-index:2;pointer-events:none}
.v3d-hint{position:absolute;right:14px;top:14px;z-index:2;font-size:11px;color:var(--muted);background:rgba(5,8,15,.7);border:1px solid var(--line);padding:6px 10px;border-radius:999px;pointer-events:none;opacity:0;transition:.3s}
.hc3d-on .v3d-hint{opacity:1}
.v3d{position:relative;height:var(--h,520px);border:1px solid var(--line);border-radius:22px;overflow:hidden;background:radial-gradient(ellipse at 50% 30%,rgba(59,130,246,.18),transparent 60%),linear-gradient(180deg,#0a1220,#05080f)}
.v3d .hud.a{top:14px;left:14px}
.v3d-cap{position:absolute;left:14px;bottom:12px;z-index:2;font-size:11px;color:var(--muted)}
.v3d-fallback{position:absolute;inset:0;display:grid;place-items:center;color:var(--muted);font-size:14px}
.hc3d-on .v3d-fallback{display:none}
.v3d-tabs{display:flex;gap:6px;flex-wrap:wrap;margin-bottom:12px}
.v3d-tabs button{font-family:inherit;font-size:13.5px;font-weight:600;padding:9px 16px;border-radius:999px;border:1px solid var(--line);background:var(--panel);color:var(--muted);cursor:pointer;transition:.2s}
.v3d-tabs button:hover{color:var(--text)}
.v3d-tabs button.on{background:var(--grad);color:#020617;border-color:transparent}

/* =========================================================
   Vòng trưng bày 3D
   ========================================================= */
.ring-stage{position:relative;height:330px;perspective:1500px;perspective-origin:50% 35%;overflow:hidden;cursor:grab;touch-action:pan-y;user-select:none;-webkit-user-select:none;outline:none}
.ring-stage:active{cursor:grabbing}
.ring{position:absolute;left:50%;top:30px;width:0;height:0;transform-style:preserve-3d}
.ring-item{position:absolute;left:-130px;top:0;width:260px;padding:0;border:1px solid var(--line);border-radius:16px;overflow:hidden;background:var(--panel);cursor:pointer;color:var(--text);font-family:inherit;backface-visibility:visible;transition:border-color .3s, box-shadow .3s}
.ring-item img{width:100%;aspect-ratio:4/3;object-fit:cover;display:block;pointer-events:none}
.ring-item span{display:block;padding:10px 12px;font-size:13px;font-weight:600;text-align:left;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.ring-item.front{border-color:var(--cyan);box-shadow:0 0 0 1px var(--cyan),0 30px 60px -20px rgba(34,211,238,.45)}
.ring-floor{position:absolute;left:10%;right:10%;bottom:20px;height:60px;background:radial-gradient(ellipse at center,rgba(34,211,238,.25),transparent 70%);filter:blur(10px);pointer-events:none}
.ring-ctrl{display:flex;justify-content:center;align-items:center;gap:18px;margin-top:8px}
.ring-ctrl .btn{padding:10px 18px}
.ring-ctrl span{min-width:220px;text-align:center;color:var(--cyan);font-size:13px}
.lb{border:1px solid var(--line);border-radius:22px;background:var(--bg2);color:var(--text);padding:0;max-width:min(980px,94vw);width:100%;overflow:hidden}
.lb::backdrop{background:rgba(2,4,10,.82);backdrop-filter:blur(6px)}
.lb img{width:100%;max-height:68vh;object-fit:cover;display:block}
.lb-body{padding:20px 24px 24px}
.lb-body h3{font-size:22px;margin:6px 0}
.lb-body p{color:var(--muted)}
.lb-x{position:absolute;top:12px;right:12px;width:40px;height:40px;border-radius:50%;border:1px solid var(--line);background:rgba(5,8,15,.8);color:var(--text);font-size:16px;cursor:pointer;z-index:2}

@media(max-width:980px){
  .topbar .wrap>span:first-child{display:none}
  .topbar .wrap{justify-content:center}
}
@media(max-width:600px){
  .v3d{height:min(var(--h,520px),420px)}
  .ring-stage{height:250px}
  .ring-item{width:180px;left:-90px}
  .ring-ctrl span{min-width:0;font-size:12px}
  .fab{left:12px;bottom:12px}
  .fab-call b{display:none}
  .fab-call{padding:0 6px}
  .topbar .tb-r{gap:12px;font-size:12px}
}
@media print{.topbar,.fab{display:none!important}}
.reveal.in.tilt{transform:perspective(900px) rotateX(var(--rx)) rotateY(var(--ry))}
.reveal.in.tilt.tilting{transition:transform .08s linear}
.contact-box b{flex:none;width:118px;min-width:0}

/* =========================================================
   Nội dung động (sản phẩm, dự án, tin tức, trang chi tiết)
   ========================================================= */
.noimg{width:100%;height:100%;display:grid;place-items:center;background:radial-gradient(circle at 50% 40%,rgba(34,211,238,.12),transparent 60%),var(--panel)}
.noimg .ico{transform:scale(1.6);margin:0}
.noimg-lg{display:grid;place-items:center}
.noimg-lg .ico{transform:scale(2.4)}
.card.case .case-img{margin:-28px -28px 16px;aspect-ratio:16/9;border-bottom:1px solid var(--line)}
.card.case .case-img img{width:100%;height:100%;object-fit:cover}
.thumbs{display:grid;grid-template-columns:repeat(auto-fill,minmax(80px,1fr));gap:8px;margin-top:12px}
.thumbs button{padding:0;border:1px solid var(--line);border-radius:10px;overflow:hidden;background:var(--panel);cursor:pointer;aspect-ratio:4/3;opacity:.65;transition:.2s}
.thumbs button.on,.thumbs button:hover{opacity:1;border-color:var(--cyan)}
.thumbs img{width:100%;height:100%;object-fit:cover}
.d-title{font-size:clamp(28px,4vw,44px);font-weight:800;letter-spacing:-.02em;line-height:1.15;margin:14px 0 10px}
.article{max-width:880px}
.prose{color:#cdd6e4;font-size:16.5px;line-height:1.8}
.prose>*+*{margin-top:14px}
.prose h2{font-size:26px;margin-top:32px;color:var(--text)}
.prose h3{font-size:20px;margin-top:24px;color:var(--text)}
.prose a{color:var(--cyan);text-decoration:underline}
.prose ul,.prose ol{padding-left:22px}
.prose img{border-radius:14px;border:1px solid var(--line);margin:8px 0}
.prose blockquote{border-left:3px solid var(--cyan);padding-left:16px;color:var(--muted);font-style:italic}
.prose table{width:100%;border-collapse:collapse;font-size:14px}
.prose th,.prose td{border:1px solid var(--line);padding:10px 12px;text-align:left}
.prose th{background:var(--panel2)}
.prose iframe{width:100%;aspect-ratio:16/9;height:auto;border:0;border-radius:14px}
.news-item h3 a:hover{color:var(--cyan)}

/* =========================================================
   Chính sách
   ========================================================= */
.foot-grid{grid-template-columns:1.3fr 1fr 1fr 1fr 1.3fr}
.policy-layout{display:grid;grid-template-columns:260px 1fr;gap:40px;align-items:start}
.pol-nav{position:sticky;top:96px;display:grid;gap:4px;padding:18px;border:1px solid var(--line);border-radius:var(--radius);background:var(--panel)}
.pol-nav .label{margin:0 0 8px 10px}
.pol-nav a{padding:9px 12px;border-radius:9px;color:var(--muted);font-size:14px}
.pol-nav a:hover{color:var(--text);background:rgba(255,255,255,.03)}
.pol-nav a.on{color:var(--cyan);background:rgba(34,211,238,.1);font-weight:600}
.pol-nav a.all{margin-top:6px;border-top:1px solid var(--line);border-radius:0;padding-top:12px;color:var(--cyan);font-size:13px}
.pol-body{min-width:0;max-width:860px}
.pol-strip{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin-top:40px}
.pol-strip a{display:flex;align-items:center;gap:10px;padding:16px;border:1px solid var(--line);border-radius:14px;background:var(--panel);font-weight:600;font-size:14px;transition:.2s}
.pol-strip a:hover{border-color:var(--cyan);color:var(--cyan)}
.pol-strip span{font-size:20px}
.consent{font-size:12px;color:var(--muted)}
.consent a{color:var(--cyan);text-decoration:underline}
@media(max-width:1080px){.foot-grid{grid-template-columns:1fr 1fr 1fr}}
@media(max-width:980px){
  .policy-layout{grid-template-columns:1fr;gap:20px}
  .pol-nav{position:static;grid-template-columns:repeat(auto-fill,minmax(150px,1fr))}
  .pol-nav .label,.pol-nav a.all{grid-column:1/-1}
  .pol-strip{grid-template-columns:1fr 1fr}
}
@media(max-width:600px){.foot-grid{grid-template-columns:1fr}}
@media print{.pol-nav,.pol-body .btn-row,.cta{display:none!important}.policy-layout{display:block}.prose{color:#111}.prose th{background:#eee}}
.fab-call b{white-space:nowrap}

/* ---------- Thông báo bảo trì / nâng cấp ---------- */
.maint-bar{position:relative;z-index:60;background:linear-gradient(90deg,#f59e0b,#fbbf24);color:#1a1300;font-size:13.5px;line-height:1.45}
.maint-bar .wrap{display:flex;align-items:center;gap:10px 14px;flex-wrap:wrap;padding-top:9px;padding-bottom:9px;padding-right:44px}
.maint-bar .dot{width:8px;height:8px;border-radius:50%;background:#7c2d12;flex:none;animation:maintP 1.4s infinite}
@keyframes maintP{50%{opacity:.25}}
.maint-bar span:not(.dot){flex:1 1 300px}
.maint-bar a{font-weight:700;color:#1a1300;text-decoration:underline;white-space:nowrap}
.maint-bar button{position:absolute;right:10px;top:50%;transform:translateY(-50%);width:30px;height:30px;border-radius:8px;border:0;background:rgba(0,0,0,.08);color:#1a1300;cursor:pointer;font-size:14px}
.maint-bar button:hover{background:rgba(0,0,0,.16)}
.maint-bar.admin{background:repeating-linear-gradient(135deg,#7c2d12 0 14px,#9a3412 14px 28px);color:#fff7ed}
.maint-bar.admin a{color:#fff7ed}
.maint-bar.admin .dot{background:#fbbf24}