/* ===================================================================
   Konix Vietnam — shared design system for industry/segment pages.
   Same visual identity as konix-vietnam-solution-landing-v4.html.
   Dark-navy, white, technical premium B2B.
   =================================================================== */
:root{
  --navy:#0a1f3c; --navy-2:#0d2547; --navy-3:#102d56; --ink:#060d18;
  --steel:#2E75B6; --steel-2:#4a90d9;
  --line:rgba(255,255,255,.10); --line-d:#e2e8f0;
  --muted:#9fb0c7; --muted-d:#5a6b82;
  --paper:#f5f8fc; --white:#fff; --accent:#37c0a0;
  --radius:14px; --shadow:0 18px 50px rgba(8,20,40,.14); --maxw:1200px;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;overflow-x:hidden;width:100%;max-width:100%}
body{font-family:"Segoe UI",Inter,Arial,Helvetica,sans-serif;color:#0e1b2e;background:var(--white);
  line-height:1.6;-webkit-font-smoothing:antialiased;overflow-x:hidden;width:100%;max-width:100%;position:relative}
img,svg,video,canvas{max-width:100%}
h1,h2,h3,h4,p,a,span{overflow-wrap:break-word;word-wrap:break-word}
a{text-decoration:none;color:inherit}
img{max-width:100%;display:block}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 24px}
.eyebrow{font-size:.74rem;letter-spacing:.22em;text-transform:uppercase;font-weight:700;color:var(--steel-2)}
.section{padding:88px 0}
.section-head{max-width:780px;margin-bottom:44px}
.section-head h2{font-size:2.05rem;line-height:1.16;font-weight:800;color:var(--navy);margin:14px 0 12px;letter-spacing:-.01em}
.section-head p{font-size:1.06rem;color:var(--muted-d)}
.btn{display:inline-flex;align-items:center;gap:9px;font-weight:700;font-size:.95rem;
  padding:14px 26px;border-radius:10px;cursor:pointer;border:1px solid transparent;transition:.25s;white-space:nowrap}
.btn-primary{background:var(--steel);color:#fff;box-shadow:0 8px 22px rgba(46,117,182,.35)}
.btn-primary:hover{background:var(--steel-2);transform:translateY(-2px)}
.btn-ghost{background:transparent;color:#fff;border-color:rgba(255,255,255,.4)}
.btn-ghost:hover{background:rgba(255,255,255,.12);border-color:#fff}
.btn-lg{padding:16px 32px;font-size:1rem}

/* ---------- HEADER ---------- */
header{position:fixed;top:0;left:0;right:0;z-index:100;transition:.3s}
.nav{display:flex;align-items:center;justify-content:space-between;height:74px}
header.scrolled{background:rgba(8,17,32,.92);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.brand{display:flex;align-items:center;gap:11px;color:#fff;text-decoration:none}
.logo-plate{background:#fff;border-radius:9px;padding:7px 12px;display:inline-flex;align-items:center;box-shadow:0 2px 10px rgba(0,0,0,.20)}
.logo-plate img{height:26px;width:auto;display:block}
.logo-text{font-weight:800;letter-spacing:.06em;color:var(--navy);font-size:19px;line-height:1;display:block}
.logo-text b{color:var(--steel)}
.foot-brand .logo-text{font-size:22px}
.brand .tag{font-size:.58rem;letter-spacing:.16em;color:var(--muted);font-weight:600;line-height:1.25;max-width:130px}
.nav-links{display:flex;align-items:center;gap:28px}
.nav-links a{color:#e7eef8;font-size:.92rem;font-weight:600;transition:.2s}
.nav-links a:hover{color:var(--steel-2)}
.nav-cta{display:flex;align-items:center;gap:14px}
.burger{display:none;flex-direction:column;gap:5px;background:none;border:0;cursor:pointer;padding:6px}
.burger span{width:26px;height:2px;background:#fff;transition:.3s}

/* ---------- INDUSTRY HERO ---------- */
.ihero{position:relative;min-height:78vh;display:flex;align-items:center;
  background-color:var(--navy);background-position:center;background-size:cover;background-repeat:no-repeat}
.ihero::after{content:"";position:absolute;inset:0;background:linear-gradient(to top,rgba(6,13,24,.85),transparent 42%)}
.ihero-inner{position:relative;z-index:2;padding:140px 0 80px;max-width:860px}
.breadcrumb{font-size:.8rem;color:#9fb6d4;margin-bottom:14px;letter-spacing:.02em}
.breadcrumb a{color:#9fb6d4}
.breadcrumb a:hover{color:#fff}
.ihero h1{color:#fff;font-size:clamp(2rem,4.4vw,3.2rem);font-weight:800;line-height:1.1;letter-spacing:-.02em;margin:10px 0 16px;max-width:820px;overflow-wrap:normal}
.ihero h1 em{font-style:normal;color:var(--steel-2)}
.ihero p.lead{color:#d4def0;font-size:1.14rem;max-width:620px;margin-bottom:30px}
.ihero-actions{display:flex;flex-wrap:wrap;gap:14px}
.ihero-tags{display:flex;flex-wrap:wrap;gap:10px;margin-top:30px}
.ihero-tags span{font-size:.78rem;font-weight:700;color:#cdd9ec;border:1px solid var(--line);border-radius:999px;padding:7px 14px;background:rgba(255,255,255,.04)}

/* ---------- SPLIT INDUSTRY HERO (image-forward) ---------- */
.shero{position:relative;min-height:100vh;min-height:100svh;display:flex;align-items:center;background:linear-gradient(160deg,var(--navy) 0%,var(--navy-2) 100%);color:#fff;padding:120px 0 64px;overflow:hidden}
.shero-grid{width:100%}
.shero::before{content:"";position:absolute;width:560px;height:560px;right:-140px;top:-160px;border-radius:50%;
  background:radial-gradient(circle,rgba(46,117,182,.22),transparent 70%);z-index:1;pointer-events:none}
.shero-grid{position:relative;z-index:2;display:grid;grid-template-columns:1.02fr .98fr;gap:50px;align-items:center}
.shero .breadcrumb{font-size:.8rem;color:#9fb6d4;margin-bottom:14px;letter-spacing:.02em}
.shero .breadcrumb a{color:#9fb6d4}.shero .breadcrumb a:hover{color:#fff}
.shero h1{color:#fff;font-size:clamp(2rem,4.2vw,3rem);font-weight:800;line-height:1.1;letter-spacing:-.02em;margin:10px 0 14px;overflow-wrap:normal}
.shero h1 em{font-style:normal;color:var(--steel-2)}
.shero p.lead{color:#d4def0;font-size:1.12rem;max-width:560px;margin-bottom:28px}
.shero-actions{display:flex;flex-wrap:wrap;gap:14px}
.shero-tags{display:flex;flex-wrap:wrap;gap:10px;margin-top:26px}
.shero-tags span{font-size:.78rem;font-weight:700;color:#cdd9ec;border:1px solid var(--line);border-radius:999px;padding:7px 14px;background:rgba(255,255,255,.04)}
.shero-media{border-radius:18px;overflow:hidden;background:#fff;border:1px solid rgba(255,255,255,.16);box-shadow:0 30px 70px rgba(0,0,0,.5)}
.shero-media img{width:100%;height:auto;display:block}

/* ---------- FULL-SCREEN PRODUCT-IMAGE HERO (image-first, Apple/Tesla style) ---------- */
.hero6{position:relative;height:100vh;height:100svh;min-height:600px;overflow:hidden;background:radial-gradient(ellipse at 50% 36%,var(--navy-2) 0%,var(--navy) 72%)}
.hero6-img{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;padding:96px 18px 168px}
.hero6-img img{max-width:min(1120px,94vw);max-height:100%;width:auto;height:auto;object-fit:contain;filter:drop-shadow(0 40px 80px rgba(0,0,0,.55))}
.hero6-overlay{position:absolute;left:0;right:0;bottom:0;z-index:3;text-align:center;padding:128px 20px 46px;
  background:linear-gradient(to top,rgba(6,13,24,.94) 0%,rgba(6,13,24,.5) 52%,transparent 100%);pointer-events:none}
.hero6-overlay>*{pointer-events:auto}
.hero6-overlay .breadcrumb{margin-bottom:8px}
.hero6-overlay .eyebrow{display:block;margin-bottom:10px}
.hero6-overlay h1{color:#fff;font-size:clamp(1.55rem,3.1vw,2.5rem);font-weight:800;line-height:1.14;letter-spacing:-.01em;margin:0 auto 18px;max-width:780px;text-shadow:0 2px 20px rgba(0,0,0,.55)}
.hero6-overlay h1 em{font-style:normal;color:var(--steel-2)}
.hero6-actions{display:flex;gap:13px;justify-content:center;flex-wrap:wrap}
@media(max-width:900px){
  .hero6-img{padding:90px 16px 200px}
  .hero6-overlay{padding:150px 18px 40px}
}
@media(max-width:680px){
  .hero6-img{padding:78px 14px 230px}
  .hero6-overlay{padding:170px 16px 34px}
  .hero6-overlay h1{font-size:1.5rem}
}

/* ---------- VISUAL HERO (full-bleed image, right text, scroll fade) ---------- */
.visual-hero{position:relative;height:100vh;height:100svh;overflow:hidden;background:#06152b}
.visual-hero-img{position:absolute;top:0;bottom:0;left:0;right:42%;width:auto;height:100%;object-fit:contain;object-position:left center;background:#06152b;transition:opacity .6s ease,transform .8s ease;z-index:1}
.visual-hero::after{display:none}
.visual-hero-text{position:absolute;right:2vw;top:50%;transform:translateY(-50%);width:min(340px,30vw);padding:24px;border-radius:18px;background:rgba(6,21,43,.62);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);border:1px solid rgba(255,255,255,.12);box-shadow:0 18px 50px rgba(0,0,0,.35);z-index:3;transition:opacity .6s ease,transform .8s ease}
.visual-hero-text .breadcrumb{margin-bottom:10px}
.visual-hero-text .eyebrow{display:block;margin-bottom:12px}
.visual-hero-text h1{color:#fff;font-size:clamp(1.9rem,3.4vw,3rem);font-weight:800;line-height:1.12;letter-spacing:-.02em;margin-bottom:22px;text-shadow:0 2px 22px rgba(0,0,0,.5)}
.visual-hero-text h1 em{font-style:normal;color:var(--steel-2)}
.visual-hero-actions{display:flex;flex-wrap:wrap;gap:13px}
.scroll-down{position:absolute;left:50%;bottom:24px;transform:translateX(-50%);z-index:3;color:#cdd9ec;font-size:.74rem;letter-spacing:.18em;text-transform:uppercase;font-weight:700;transition:opacity .5s ease;animation:bob 2s ease-in-out infinite}
@keyframes bob{0%,100%{transform:translate(-50%,0)}50%{transform:translate(-50%,6px)}}
.visual-hero.is-scrolled .visual-hero-img{opacity:0;transform:scale(1.08) translateY(-40px)}
.visual-hero.is-scrolled .visual-hero-text{opacity:0;transform:translateY(-60%)}
.visual-hero.is-scrolled .scroll-down{opacity:0}
@media(max-width:820px){
  .visual-hero-img{left:0;right:0;width:100%;object-position:center top}
  .visual-hero-text{right:auto;left:50%;top:auto;bottom:20px;transform:translateX(-50%);width:calc(100% - 32px);max-width:520px;padding:18px 20px;text-align:center}
  .visual-hero-text h1{font-size:1.6rem}
  .visual-hero-actions{justify-content:center}
  .visual-hero.is-scrolled .visual-hero-text{opacity:0;transform:translate(-50%,16px)}
}
@media(max-width:900px){
  .shero{min-height:auto;padding:104px 0 50px}
  .shero-grid{grid-template-columns:1fr;gap:26px}
  .shero p.lead{max-width:none}
}

/* ---------- TRUST STRIP ---------- */
.trust{background:var(--ink);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.trust-row{display:flex;align-items:center;justify-content:center;flex-wrap:wrap;gap:14px 36px;padding:20px 0}
.trust-row span{color:#cdd9ec;font-size:.88rem;font-weight:600;display:flex;align-items:center;gap:9px}
.trust-row span::before{content:"";width:7px;height:7px;border-radius:50%;background:var(--steel-2)}

/* ---------- CHALLENGES ---------- */
.chal-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.chal-card{background:#fff;border:1px solid var(--line-d);border-left:4px solid #d9542b;border-radius:12px;padding:24px;transition:.3s}
.chal-card:hover{box-shadow:var(--shadow);transform:translateY(-4px)}
.chal-card h3{font-size:1.04rem;color:var(--navy);font-weight:800;margin-bottom:8px}
.chal-card p{font-size:.92rem;color:#3c4a5e}

/* ---------- SOLUTION (two-col) ---------- */
.solution{background:var(--navy);color:#fff}
.sol2{display:grid;grid-template-columns:1fr 1fr;gap:46px;align-items:center}
.solution .section-head h2{color:#fff}
.solution .eyebrow{color:var(--steel-2)}
.sol2 .body p{color:#c6d3e6;font-size:1.02rem;margin-bottom:16px}
.sol2 ul{list-style:none;display:grid;gap:12px;margin-top:8px}
.sol2 li{display:flex;gap:12px;align-items:flex-start;color:#e2ebf7;font-size:.96rem}
.sol2 li svg{flex:none;width:21px;height:21px;stroke:var(--steel-2);fill:none;stroke-width:2;margin-top:3px}
.sol2-media{border-radius:var(--radius);overflow:hidden;box-shadow:0 24px 60px rgba(0,0,0,.4);border:1px solid var(--line);background:#0b1c34;min-height:240px}
.sol2-media img{width:100%;height:100%;object-fit:cover}

/* ---------- APPLICATIONS ---------- */
.app-wrap{display:flex;flex-wrap:wrap;gap:12px}
.app-chip{background:#fff;border:1px solid var(--line-d);border-radius:999px;padding:11px 18px;font-size:.9rem;font-weight:600;color:var(--navy);transition:.2s}
.app-chip:hover{border-color:var(--steel);box-shadow:0 6px 16px -8px rgba(10,20,40,.25);transform:translateY(-2px)}

/* ---------- BENEFITS ---------- */
.benefits{background:var(--paper)}
.ben-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}
.ben-card{background:#fff;border:1px solid var(--line-d);border-radius:12px;padding:24px;display:flex;gap:16px;align-items:flex-start}
.ben-card .ic{flex:none;width:44px;height:44px;border-radius:10px;background:#eaf2fb;display:flex;align-items:center;justify-content:center}
.ben-card .ic svg{width:22px;height:22px;stroke:var(--steel);fill:none;stroke-width:1.9}
.ben-card h3{font-size:1.02rem;color:var(--navy);font-weight:800;margin-bottom:5px}
.ben-card p{font-size:.9rem;color:#3c4a5e}
.ben-card .role{display:block;font-size:.72rem;font-weight:700;text-transform:uppercase;letter-spacing:.06em;color:var(--steel);margin-top:8px}

/* ---------- FEATURES ---------- */
.feat-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.feat-card{border:1px solid var(--line-d);border-radius:12px;padding:24px;background:#fff;border-top:4px solid var(--steel);transition:.3s}
.feat-card:hover{box-shadow:var(--shadow);transform:translateY(-4px)}
.feat-card h3{font-size:1.02rem;color:var(--navy);font-weight:800;margin-bottom:6px}
.feat-card p{font-size:.9rem;color:#3c4a5e}

/* ---------- CASE STUDY ---------- */
.casestudy{background:var(--navy);color:#fff}
.casestudy .section-head h2{color:#fff}
.casestudy .eyebrow{color:var(--steel-2)}
.cs-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.cs-step{background:var(--navy-2);border:1px solid var(--line);border-radius:12px;padding:24px}
.cs-step .lab{font-size:.72rem;font-weight:800;letter-spacing:.08em;text-transform:uppercase;display:block;margin-bottom:8px}
.cs-step.p .lab{color:#f0a072}.cs-step.s .lab{color:var(--steel-2)}.cs-step.r .lab{color:#7fe3c1}
.cs-step p{font-size:.94rem;color:#dbe6f5}
.cs-step.r p{font-weight:700;color:#fff}
.cs-note{font-size:.8rem;color:#9fb6d4;margin-top:18px;font-style:italic}

/* ---------- FAQ ---------- */
.faq-list{max-width:860px;margin:0 auto;display:grid;gap:12px}
.faq{background:#fff;border:1px solid var(--line-d);border-radius:12px;overflow:hidden}
.faq summary{list-style:none;cursor:pointer;padding:20px 24px;font-weight:700;color:var(--navy);font-size:1rem;
  display:flex;justify-content:space-between;align-items:center;gap:16px}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";font-size:1.4rem;color:var(--steel);font-weight:400;transition:.2s}
.faq[open] summary::after{transform:rotate(45deg)}
.faq .a{padding:0 24px 20px;color:#3c4a5e;font-size:.94rem}

/* ---------- CONTACT / RFQ ---------- */
.contact{background:#fff}
.contact-grid{display:grid;grid-template-columns:.85fr 1.15fr;gap:50px}
.contact-info h2{font-size:1.9rem;color:var(--navy);font-weight:800;margin-bottom:14px;line-height:1.16}
.contact-info p{color:var(--muted-d);margin-bottom:24px}
.contact-info .meta{display:grid;gap:16px;margin-top:22px}
.contact-info .meta>div{display:flex;gap:12px;align-items:flex-start}
.contact-info .meta svg{flex:none;width:20px;height:20px;stroke:var(--steel);fill:none;stroke-width:1.8;margin-top:3px}
.contact-info .meta b{display:block;color:var(--navy);font-size:.92rem}
.contact-info .meta span{color:var(--muted-d);font-size:.88rem}
.chat-row{margin-top:24px;padding-top:20px;border-top:1px solid var(--line-d)}
.chat-lab{font-size:.74rem;letter-spacing:.12em;text-transform:uppercase;font-weight:700;color:var(--steel);display:block;margin-bottom:12px}
.chans{display:flex;flex-wrap:wrap;gap:9px}
.chan{display:inline-flex;align-items:center;gap:8px;border:1px solid #cdd8e6;border-radius:10px;padding:9px 14px;font-size:.86rem;font-weight:700;color:var(--navy);background:#fff;transition:.18s}
.chan:hover{transform:translateY(-2px);border-color:var(--steel);box-shadow:0 6px 16px -8px rgba(10,20,40,.25)}
.chan .d{width:9px;height:9px;border-radius:50%}
.second-source{margin-top:16px;font-size:.86rem;color:#33415a;background:#eef5fc;border:1px solid #cfe0f2;border-radius:10px;padding:13px 15px}
.second-source b{color:var(--navy)}
.rfq{background:var(--paper);border:1px solid var(--line-d);border-radius:var(--radius);padding:34px}
.rfq .row{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.field{margin-bottom:16px}
.field label{display:block;font-size:.82rem;font-weight:700;color:var(--navy);margin-bottom:6px}
.field label .req{color:#d9542b}
.field input,.field select,.field textarea{width:100%;padding:12px 14px;border:1px solid #cdd8e6;border-radius:9px;font:inherit;font-size:.92rem;background:#fff;transition:.2s}
.field input:focus,.field select:focus,.field textarea:focus{outline:none;border-color:var(--steel);box-shadow:0 0 0 3px rgba(46,117,182,.14)}
.field textarea{resize:vertical;min-height:108px}
.file-drop{border:1.5px dashed #b8c6d8;border-radius:9px;padding:18px;text-align:center;cursor:pointer;transition:.2s;background:#fff}
.file-drop:hover{border-color:var(--steel);background:#f0f6fc}
.file-drop svg{width:26px;height:26px;stroke:var(--steel);fill:none;stroke-width:1.6;margin:0 auto 6px}
.file-drop span{font-size:.86rem;color:var(--muted-d)}
.file-drop b{color:var(--steel)}
.file-name{font-size:.82rem;color:#1f9e6f;font-weight:700;margin-top:8px}
.rfq .reassure{font-size:.82rem;color:var(--muted-d);margin-top:14px;text-align:center}
.form-success{display:none;background:#e6f7ef;border:1px solid #9fdcc0;color:#11623f;padding:16px;border-radius:10px;font-weight:600;margin-bottom:18px}
.form-error{display:none;background:#fdecec;border:1px solid #f1b4b4;color:#9b2222;padding:16px;border-radius:10px;font-weight:600;margin-bottom:18px}

/* ---------- FOOTER ---------- */
footer{background:var(--ink);color:#9fb0c7;padding:60px 0 30px}
.foot-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:30px;margin-bottom:40px}
footer h4{color:#fff;font-size:.92rem;text-transform:uppercase;letter-spacing:.08em;margin-bottom:16px}
footer a{display:block;color:#9fb0c7;font-size:.9rem;margin-bottom:9px;transition:.2s}
footer a:hover{color:var(--steel-2)}
.foot-brand p{font-size:.9rem;max-width:320px;margin-top:14px}
.foot-brand .logo-plate{padding:9px 13px;border-radius:10px}
.foot-brand .logo-plate img{height:30px}
.foot-brand a{display:inline}
.foot-bottom{border-top:1px solid var(--line);padding-top:22px;display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;font-size:.82rem}
.foot-bottom a{display:inline;color:var(--steel-2)}

/* ---------- REVEAL ---------- */
.reveal{opacity:0;transform:translateY(28px);transition:.7s cubic-bezier(.2,.7,.3,1)}
.reveal.in{opacity:1;transform:none}

/* ---------- NAV: chong chen giua logo / menu / chon ngon ngu / nut CTA ----------
   Menu co 6 muc sau khi them Engineering. Thu tu thu hep:
   1) giam khoang cach  2) an dong chu duoi logo  3) chuyen sang nut hamburger. */
.nav-links{flex-wrap:nowrap}
.nav-links a{white-space:nowrap}
@media(max-width:1400px){ .nav-links{gap:22px} }
@media(max-width:1240px){
  .brand .tag{display:none}
  .nav-links{gap:17px}
  .nav-links a{font-size:.87rem}
  .nav-cta{gap:10px}
  .nav-cta .btn{padding:12px 18px;font-size:.88rem}
}
@media(max-width:1080px){
  .nav-links{display:none;position:absolute;top:74px;left:0;right:0;background:rgba(8,17,32,.98);
    flex-direction:column;padding:20px 24px;gap:18px;border-bottom:1px solid var(--line)}
  .nav-links.open{display:flex}
  .nav-links a{font-size:1rem}
  .burger{display:flex}
}

/* ---------- RESPONSIVE ---------- */
@media(max-width:980px){
  .chal-grid,.feat-grid,.cs-grid{grid-template-columns:repeat(2,1fr)}
  .ben-grid{grid-template-columns:1fr}
  .sol2,.contact-grid{grid-template-columns:1fr;gap:34px}
  .foot-grid{grid-template-columns:repeat(3,1fr);gap:34px 24px}
  .foot-brand{grid-column:1/-1}
  .foot-brand p{max-width:none}
}
@media(max-width:680px){
  .section{padding:60px 0}
  .foot-grid{grid-template-columns:1fr 1fr;gap:30px 20px;margin-bottom:32px}
  footer{padding:48px 0 26px}
  .foot-bottom{flex-direction:column;gap:8px}
  .nav-links{display:none;position:absolute;top:74px;left:0;right:0;background:rgba(8,17,32,.98);flex-direction:column;padding:20px 24px;gap:18px;border-bottom:1px solid var(--line)}
  .nav-links.open{display:flex}
  .nav-cta .btn{display:none}
  .burger{display:flex}
  .chal-grid,.feat-grid,.cs-grid{grid-template-columns:1fr}
  .rfq .row{grid-template-columns:1fr}
  .ihero h1{font-size:1.9rem;line-height:1.14}
  .rfq{padding:24px}
}
@media(max-width:420px){
  .foot-grid{grid-template-columns:1fr;gap:26px}
}