/* Trang công cụ — Vi Tính NDC */
:root{
  --bg:#ffffff; --bg-alt:#f6f5f3; --panel:#ffffff; --ink:#1d1f23; --ink-2:#3d424a; --muted:#6b7280; --line:#e6e3df;
  --brand:#d4500f; --brand-hover:#b9450c; --brand-ink:#ffffff; --brand-soft:#fdf0e8; --brand-text:#b8440b;
  --accent:#2563eb; --good:#16a34a;
  --radius:14px; --shadow:0 1px 2px rgba(20,16,12,.05),0 8px 28px rgba(20,16,12,.08);
  --shot-shadow:0 2px 6px rgba(20,16,12,.08),0 24px 60px -12px rgba(20,16,12,.25);
  --maxw:1180px;
}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    --bg:#111214; --bg-alt:#17181b; --panel:#1b1c20; --ink:#ecebe8; --ink-2:#c9c7c3; --muted:#9a9894; --line:#2b2c31;
    --brand:#f07a3e; --brand-hover:#ff8f55; --brand-ink:#1a0d05; --brand-soft:#2a1a11; --brand-text:#ff9a63;
    --accent:#60a5fa; --good:#22c55e;
    --shadow:none; --shot-shadow:0 24px 60px -12px rgba(0,0,0,.6);
  }
}
:root[data-theme="dark"]{
  --bg:#111214; --bg-alt:#17181b; --panel:#1b1c20; --ink:#ecebe8; --ink-2:#c9c7c3; --muted:#9a9894; --line:#2b2c31;
  --brand:#f07a3e; --brand-hover:#ff8f55; --brand-ink:#1a0d05; --brand-soft:#2a1a11; --brand-text:#ff9a63;
  --accent:#60a5fa; --good:#22c55e;
  --shadow:none; --shot-shadow:0 24px 60px -12px rgba(0,0,0,.6);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.65 "Be Vietnam Pro",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif}
img{max-width:100%;height:auto;display:block}
a{color:var(--brand-text)}
h1,h2,h3{line-height:1.2;letter-spacing:-.02em;margin:0}
h1{font-size:clamp(32px,5vw,52px);font-weight:800}
h2{font-size:clamp(26px,3.4vw,36px);font-weight:750}
h3{font-size:20px;font-weight:700}
p{margin:0}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 20px}
.skip{position:absolute;left:-999px}
.skip:focus{left:16px;top:12px;z-index:100;background:var(--panel);padding:8px 12px;border-radius:8px}
:focus-visible{outline:2px solid var(--brand);outline-offset:2px}

/* header */
.site-head{position:sticky;top:0;z-index:40;background:color-mix(in srgb,var(--bg) 88%,transparent);backdrop-filter:saturate(1.4) blur(12px);-webkit-backdrop-filter:saturate(1.4) blur(12px);border-bottom:1px solid var(--line)}
.site-head .wrap{display:flex;align-items:center;gap:20px;min-height:68px}
.brand{display:flex;align-items:center;gap:10px;color:var(--ink);text-decoration:none;flex:none}
.brand img{width:42px;height:42px;border-radius:50%;background:#fff;box-shadow:0 0 0 1px var(--line)}
.brand span{display:flex;flex-direction:column;line-height:1.15;font-weight:800;font-size:17px}
.brand small{font-size:11.5px;font-weight:600;color:var(--muted);letter-spacing:.04em}
.nav{display:flex;gap:4px;margin-left:auto}
.nav a{color:var(--ink-2);text-decoration:none;font-weight:550;font-size:15px;padding:8px 12px;border-radius:8px}
.nav a:hover,.nav a[aria-current="page"]{color:var(--ink);background:var(--bg-alt)}
.head-cta{display:flex;gap:8px;align-items:center}
.theme-btn svg{width:18px;height:18px}
.theme-btn{width:38px;height:38px;border-radius:10px;border:1px solid var(--line);background:var(--panel);color:var(--ink);cursor:pointer;font-size:16px;display:grid;place-items:center}
.menu-btn{display:none}
@media (max-width:860px){
  .nav{position:fixed;inset:68px 0 auto 0;flex-direction:column;background:var(--bg);border-bottom:1px solid var(--line);padding:8px 16px 16px;display:none;margin:0}
  .nav.open{display:flex}
  .nav a{padding:12px}
  .menu-btn{display:grid}
  .head-cta .btn-call span{display:none}
  .site-head .wrap{gap:12px}
  .head-cta{margin-left:auto}
}

/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;font:inherit;font-weight:650;font-size:15.5px;text-decoration:none;border-radius:12px;padding:12px 20px;border:1.5px solid var(--line);color:var(--ink);background:var(--panel);cursor:pointer;transition:background .15s,border-color .15s,transform .15s;white-space:nowrap}
.btn:hover{border-color:var(--ink-2)}
.btn:active{transform:translateY(1px)}
.btn-primary{background:var(--brand);border-color:var(--brand);color:var(--brand-ink)}
.btn-primary:hover{background:var(--brand-hover);border-color:var(--brand-hover)}
.btn-lg{padding:15px 26px;font-size:17px;border-radius:14px}
.btn-sm{padding:8px 14px;font-size:14px;border-radius:10px}
.btn-call{border-color:var(--brand);color:var(--brand-text)}
.btn-call:hover{background:var(--brand-soft);border-color:var(--brand)}
.btn small{font-weight:500;opacity:.85;font-size:13px}

/* sections */
section{padding:88px 0}
.alt{background:var(--bg-alt)}
.eyebrow{display:inline-flex;align-items:center;gap:8px;font-size:13.5px;font-weight:700;letter-spacing:.06em;text-transform:uppercase;color:var(--brand-text)}
.lead{font-size:clamp(17px,1.8vw,20px);color:var(--ink-2);max-width:640px}
.sec-head{max-width:720px;margin-bottom:44px}
.sec-head h2{margin:10px 0 14px}
.sec-head.center{text-align:center;margin-left:auto;margin-right:auto}
.sec-head.center .lead{margin:0 auto}
.muted{color:var(--muted)}

/* hero */
.hero{padding:72px 0 88px;overflow:hidden}
.hero .wrap{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.15fr);gap:56px;align-items:center}
.hero h1{margin:14px 0 18px}
.hero h1 em{font-style:normal;color:var(--brand)}
.hero .actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:30px}
.hero .meta{display:flex;flex-wrap:wrap;gap:8px 18px;margin-top:22px;font-size:14px;color:var(--muted)}
.hero .meta > span::before{content:"✓ ";color:var(--good);font-weight:700}
.hero-visual{position:relative}
.hero-visual .phone{position:absolute;width:30%;right:-4%;bottom:-12%;border-radius:22px;box-shadow:var(--shot-shadow);border:6px solid #1d1f23;background:#1d1f23}
@media (max-width:900px){.hero .wrap{grid-template-columns:1fr;gap:44px}.hero-visual .phone{right:2%;bottom:-8%;width:28%}}

/* browser frame */
.frame{border-radius:12px;overflow:hidden;background:var(--panel);box-shadow:var(--shot-shadow);border:1px solid var(--line)}
.frame .bar{display:flex;align-items:center;gap:6px;padding:9px 12px;background:var(--bg-alt);border-bottom:1px solid var(--line)}
.frame .bar i{width:10px;height:10px;border-radius:50%;background:var(--line)}
.frame .bar i:nth-child(1){background:#ff5f57}.frame .bar i:nth-child(2){background:#febc2e}.frame .bar i:nth-child(3){background:#28c840}
.frame .bar span{margin-left:10px;font-size:12px;color:var(--muted);background:var(--panel);border-radius:6px;padding:2px 10px;flex:1;max-width:280px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.frame img{width:100%;height:auto;aspect-ratio:16/10;object-fit:cover;object-position:top}
button.zoom{all:unset;display:block;cursor:zoom-in;width:100%}
button.zoom:focus-visible{outline:2px solid var(--brand);outline-offset:4px;border-radius:12px}

/* tool cards */
.tools{display:grid;grid-template-columns:repeat(auto-fill,minmax(min(100%,520px),1fr));gap:24px}
.tool{display:flex;flex-direction:column;background:var(--panel);border:1px solid var(--line);border-radius:18px;overflow:hidden;box-shadow:var(--shadow);transition:transform .2s,box-shadow .2s}
.tool:hover{transform:translateY(-3px)}
.tool .shot{background:var(--bg-alt);padding:22px 22px 0;overflow:hidden}
.tool .shot img{border-radius:10px 10px 0 0;box-shadow:var(--shot-shadow);aspect-ratio:16/9;object-fit:cover;object-position:top}
.tool .body{padding:24px;display:flex;flex-direction:column;gap:12px;flex:1}
.tool .title{display:flex;align-items:center;gap:12px}
.tool .title img{width:44px;height:44px;border-radius:12px;background:#fff;box-shadow:0 0 0 1px var(--line)}
.tool .title small{display:block;font-size:13px;color:var(--muted);font-weight:500}
.tags{display:flex;flex-wrap:wrap;gap:6px}
.tag{font-size:12.5px;font-weight:600;padding:3px 10px;border-radius:999px;background:var(--bg-alt);color:var(--ink-2);border:1px solid var(--line)}
.tag.free{background:var(--brand-soft);color:var(--brand-text);border-color:transparent}
.tool ul{margin:0;padding-left:20px;color:var(--ink-2);font-size:15px}
.tool ul li{margin:3px 0}
.tool .actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:auto;padding-top:6px}
.tool.soon{border-style:dashed;box-shadow:none;align-items:center;justify-content:center;text-align:center;padding:40px 28px;background:transparent}
.tool.soon:hover{transform:none}
.tool.soon .ico{font-size:36px;margin-bottom:6px}

/* features */
.points{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:20px}
.point{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:24px}
.point .ico{width:46px;height:46px;border-radius:12px;background:var(--brand-soft);display:grid;place-items:center;font-size:22px;margin-bottom:14px}
.point h3{font-size:17.5px;margin-bottom:6px}
.point p{color:var(--ink-2);font-size:15px}

.feature{display:grid;grid-template-columns:minmax(0,.9fr) minmax(0,1.25fr);gap:56px;align-items:center;padding:44px 0}
.feature + .feature{border-top:1px solid var(--line)}
.feature:nth-child(even) .text{order:2}
.feature .num{font-size:13.5px;font-weight:800;color:var(--brand-text);letter-spacing:.06em}
.feature h3{font-size:clamp(22px,2.6vw,28px);margin:8px 0 12px}
.feature p{color:var(--ink-2)}
.checks{list-style:none;padding:0;margin:16px 0 0}
.checks li{position:relative;padding-left:28px;margin:8px 0;color:var(--ink-2)}
.checks li::before{content:"";position:absolute;left:0;top:6px;width:18px;height:18px;border-radius:50%;background:var(--brand-soft)}
.checks li::after{content:"";position:absolute;left:6px;top:10px;width:6px;height:9px;border:solid var(--brand);border-width:0 2px 2px 0;transform:rotate(45deg)}
@media (max-width:900px){.feature{grid-template-columns:1fr;gap:28px}.feature:nth-child(even) .text{order:0}}

/* gallery */
.gallery{display:grid;grid-template-columns:repeat(auto-fill,minmax(min(100%,260px),1fr));gap:16px}
.gallery figure{margin:0}
.gallery img{border-radius:10px;border:1px solid var(--line);aspect-ratio:16/10;object-fit:cover;object-position:top;transition:transform .2s}
.gallery button:hover img{transform:scale(1.02)}
.gallery figcaption{font-size:13.5px;color:var(--muted);margin-top:8px}

/* steps / tabs */
.tabs{display:inline-flex;gap:4px;background:var(--bg-alt);border:1px solid var(--line);border-radius:12px;padding:4px;margin-bottom:24px;flex-wrap:wrap}
.tabs button{font:inherit;font-weight:600;font-size:15px;border:0;background:transparent;color:var(--ink-2);padding:8px 18px;border-radius:9px;cursor:pointer}
.tabs button[aria-selected="true"]{background:var(--panel);color:var(--ink);box-shadow:0 1px 3px rgba(0,0,0,.12)}
.steps{counter-reset:s;display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:18px;list-style:none;padding:0;margin:0}
.steps li{counter-increment:s;background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:22px 22px 22px 22px;position:relative}
.steps li::before{content:counter(s);display:grid;place-items:center;width:34px;height:34px;border-radius:50%;background:var(--brand);color:var(--brand-ink);font-weight:800;margin-bottom:12px}
.steps li > b{display:block;margin-bottom:4px}
.steps li p{color:var(--ink-2);font-size:15px}
code,.mono{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:.88em;background:var(--bg-alt);border:1px solid var(--line);border-radius:6px;padding:1px 6px}
.note{margin-top:18px;padding:14px 16px;border-radius:12px;background:var(--brand-soft);color:var(--ink);font-size:15px}

/* specs */
.specs{width:100%;border-collapse:collapse;font-size:15px;background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden}
.specs th,.specs td{text-align:left;padding:13px 18px;border-bottom:1px solid var(--line);vertical-align:top}
.specs tr:last-child th,.specs tr:last-child td{border-bottom:0}
.specs th{width:34%;color:var(--muted);font-weight:600}

/* faq */
.faq{max-width:820px}
.faq details{border-bottom:1px solid var(--line);padding:18px 0}
.faq summary{cursor:pointer;font-weight:650;font-size:17px;list-style:none;display:flex;justify-content:space-between;gap:16px}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";font-size:22px;line-height:1;color:var(--brand-text);flex:none}
.faq details[open] summary::after{content:"−"}
.faq details p{margin-top:10px;color:var(--ink-2)}

/* download box */
.dl{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:28px;align-items:center;background:var(--panel);border:1px solid var(--line);border-radius:20px;padding:32px;box-shadow:var(--shadow)}
.dl .info{display:flex;gap:18px;align-items:center}
.dl .info img{width:64px;height:64px;border-radius:16px;background:#fff;box-shadow:0 0 0 1px var(--line)}
.dl .info p{color:var(--muted);font-size:14.5px;margin-top:4px}
@media (max-width:700px){.dl{grid-template-columns:1fr;padding:24px}.dl .btn{width:100%}}

/* changelog */
.log{border-left:2px solid var(--line);padding-left:22px;max-width:760px}
.log article{position:relative;padding-bottom:22px}
.log article::before{content:"";position:absolute;left:-29px;top:6px;width:12px;height:12px;border-radius:50%;background:var(--brand);box-shadow:0 0 0 4px var(--bg)}
.log h3{font-size:17px}
.log h3 small{font-weight:500;color:var(--muted);font-size:14px;margin-left:6px}
.log ul{margin:8px 0 0;padding-left:20px;color:var(--ink-2);font-size:15px}

/* contact */
.contact{display:grid;grid-template-columns:minmax(0,1.2fr) minmax(0,1fr);gap:28px;align-items:stretch}
.contact .card{background:var(--panel);border:1px solid var(--line);border-radius:20px;padding:32px;box-shadow:var(--shadow)}
.contact .company{display:flex;gap:16px;align-items:center;margin-bottom:22px}
.contact .company img{width:72px;height:72px;border-radius:50%;background:#fff;box-shadow:0 0 0 1px var(--line);flex:none}
.contact .company b{font-size:19px;display:block;line-height:1.3}
.contact dl{display:grid;grid-template-columns:auto minmax(0,1fr);gap:10px 18px;margin:0;font-size:15.5px}
.contact dt{color:var(--muted)}
.contact dd{margin:0}
.contact .call-card{background:var(--brand);color:var(--brand-ink);border:0;display:flex;flex-direction:column;justify-content:center;gap:12px}
.contact .call-card a.phone{color:var(--brand-ink);font-size:clamp(30px,4vw,40px);font-weight:800;text-decoration:none;letter-spacing:-.01em}
.contact .call-card .btn{background:var(--brand-ink);color:var(--brand);border-color:var(--brand-ink);align-self:flex-start}
@media (max-width:860px){.contact{grid-template-columns:1fr}}

/* footer */
.site-foot{border-top:1px solid var(--line);padding:36px 0;font-size:14px;color:var(--muted)}
.site-foot .wrap{display:flex;flex-wrap:wrap;gap:16px 28px;justify-content:space-between;align-items:center}
.site-foot a{color:inherit}

/* breadcrumb */
.crumb{font-size:14px;color:var(--muted);margin-bottom:18px}
.crumb a{color:inherit;text-decoration:none}
.crumb a:hover{color:var(--ink)}

/* lightbox */
dialog.lb{border:0;padding:0;background:transparent;max-width:min(1400px,96vw);max-height:94vh;overflow:visible}
dialog.lb::backdrop{background:rgba(10,10,12,.86)}
dialog.lb img{max-width:min(1400px,96vw);max-height:84vh;width:auto;height:auto;border-radius:10px;margin:0 auto}
dialog.lb p{color:#eee;text-align:center;margin-top:12px;font-size:15px}
dialog.lb .x,dialog.lb .nav-b{position:fixed;background:rgba(255,255,255,.12);color:#fff;border:0;width:44px;height:44px;border-radius:50%;font-size:22px;cursor:pointer;display:grid;place-items:center}
dialog.lb .x{top:16px;right:16px}
dialog.lb .prev{left:16px;top:50%}
dialog.lb .next{right:16px;top:50%}
dialog.lb .x:hover,dialog.lb .nav-b:hover{background:rgba(255,255,255,.25)}

@media (prefers-reduced-motion: reduce){*{transition:none!important;scroll-behavior:auto!important}}

/* PC Toolkit */
.stack-shots{position:relative;aspect-ratio:16/12}
.stack-shots .zoom{position:absolute;width:82%}
.stack-shots .zoom img{border-radius:14px;box-shadow:var(--shot-shadow);aspect-ratio:16/9;object-fit:cover}
.stack-shots .s1{left:0;top:0}
.stack-shots .s2{right:0;bottom:0}
.score-card{position:absolute;left:4%;bottom:6%;background:var(--panel);border:1px solid var(--line);border-radius:16px;padding:14px 18px;box-shadow:var(--shot-shadow);display:flex;flex-direction:column;line-height:1.2}
.score-card span{font-size:12.5px;color:var(--muted);font-weight:600}
.score-card b{font-size:38px;font-weight:800;color:var(--good);letter-spacing:-.02em}
.score-card b small{font-size:16px;color:var(--muted);font-weight:600}
.score-card i{font-style:normal;font-size:13px;color:var(--ink-2)}
.groups{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,260px),1fr));gap:20px}
.group{background:var(--panel);border:1px solid var(--line);border-radius:18px;padding:22px;display:flex;flex-direction:column;gap:14px}
.group h3{font-size:17px;display:flex;align-items:center;gap:10px;padding-bottom:12px;border-bottom:1px solid var(--line)}
.group h3 span{width:38px;height:38px;border-radius:10px;background:var(--brand-soft);display:grid;place-items:center;font-size:19px}
.fn > b{display:block;font-size:15.5px;margin-bottom:2px}
.fn p{font-size:14px;color:var(--ink-2);line-height:1.55}
.scenes{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px;margin-bottom:44px}
.scenes figure{margin:0}
.scenes img{border-radius:12px;aspect-ratio:16/9;object-fit:cover;box-shadow:var(--shot-shadow)}
.scenes figcaption{margin-top:10px;font-size:14px;color:var(--muted)}
.scenes figcaption b{color:var(--ink);margin-right:4px}
.split2{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:40px;align-items:start}
@media (max-width:860px){.scenes{grid-template-columns:1fr}.split2{grid-template-columns:1fr}}
.usb-art{display:flex;flex-direction:column;align-items:center;gap:22px;padding:32px;background:var(--bg-alt);border-radius:20px;border:1px solid var(--line)}
.usb{display:flex;align-items:center;filter:drop-shadow(0 18px 30px rgba(0,0,0,.18))}
.usb .cap{width:46px;height:44px;background:linear-gradient(#d9dce1,#b7bcc4);border-radius:6px 0 0 6px;position:relative}
.usb .cap::before,.usb .cap::after{content:"";position:absolute;left:12px;width:10px;height:8px;background:#7c828c;border-radius:2px}
.usb .cap::before{top:10px}.usb .cap::after{bottom:10px}
.usb .body{width:200px;height:72px;background:linear-gradient(135deg,#2a2d33,#17191d);border-radius:0 16px 16px 0;display:flex;align-items:center;gap:12px;padding:0 18px;color:#fff}
.usb .body img{width:40px;height:40px;border-radius:50%;background:#fff}
.usb .body b{font-size:22px;letter-spacing:.06em}
.parts{display:grid;grid-template-columns:1fr 2fr;width:100%;max-width:420px;border-radius:12px;overflow:hidden;font-size:13px;text-align:center}
.parts div{padding:12px 8px;color:#fff;display:flex;flex-direction:column}
.parts div:first-child{background:#2563eb}
.parts div:last-child{background:var(--brand)}
.parts small{opacity:.9}