/* ===== IDTECHVIET — Company website styles ===== */
:root{
  --blue-900:#062a63; --blue-700:#0a3d91; --blue-600:#1565d8; --blue-500:#2b7fff;
  --orange:#ff7a00; --orange-600:#ff5e00; --red:#ff3d00; --yellow:#ffc400;
  --green:#5fb800; --green-600:#4caf50;
  --ink:#0d1b2a; --slate:#475569; --muted:#64748b; --line:#e6ecf5;
  --bg:#ffffff; --bg-soft:#f5f8fd; --card:#ffffff;
  --shadow:0 18px 45px -22px rgba(10,61,145,.45);
  --radius:18px;
  --grad-brand:linear-gradient(120deg,var(--blue-700),var(--blue-500));
  --grad-flame:linear-gradient(120deg,var(--yellow),var(--orange),var(--red));
  --font:'Be Vietnam Pro',system-ui,-apple-system,'Segoe UI',Roboto,sans-serif;
  --max:1180px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{font-family:var(--font);color:var(--ink);background:var(--bg);line-height:1.65;overflow-x:hidden}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
.container{width:100%;max-width:var(--max);margin:0 auto;padding:0 22px}
.section{padding:92px 0}
.section.alt{background:var(--bg-soft)}
.eyebrow{display:inline-block;font-weight:700;font-size:.8rem;letter-spacing:.14em;text-transform:uppercase;
  color:var(--blue-600);background:rgba(43,127,255,.10);padding:6px 14px;border-radius:999px;margin-bottom:16px}
.section-head{max-width:720px;margin:0 auto 54px;text-align:center}
h1,h2,h3{line-height:1.18;letter-spacing:-.02em;font-weight:800}
h2{font-size:clamp(1.8rem,3.4vw,2.6rem)}
.section-head p{color:var(--muted);margin-top:14px;font-size:1.05rem}
.btn{display:inline-flex;align-items:center;gap:9px;font-weight:700;font-family:inherit;cursor:pointer;
  border:none;border-radius:999px;padding:14px 26px;font-size:.98rem;transition:.25s;white-space:nowrap}
.btn svg{width:18px;height:18px}
.btn-primary{background:var(--grad-flame);color:#fff;box-shadow:0 12px 30px -10px rgba(255,94,0,.6)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 18px 38px -10px rgba(255,94,0,.7)}
.btn-ghost{background:rgba(255,255,255,.12);color:#fff;border:1.5px solid rgba(255,255,255,.4)}
.btn-ghost:hover{background:rgba(255,255,255,.22)}
.btn-dark{background:var(--grad-brand);color:#fff;box-shadow:var(--shadow)}
.btn-dark:hover{transform:translateY(-2px)}

/* ===== Header ===== */
.header{position:fixed;inset:0 0 auto 0;z-index:50;transition:.3s;padding:8px 0}
.header.scrolled{background:rgba(255,255,255,.92);backdrop-filter:blur(14px);box-shadow:0 6px 24px -16px rgba(6,42,99,.5);padding:6px 0}
.nav{display:flex;align-items:center;justify-content:space-between;gap:24px}
.brand{display:flex;align-items:center;gap:12px;font-weight:800;font-size:1.05rem}
.brand img{width:115px;height:115px;filter:drop-shadow(0 6px 12px rgba(0,0,0,.25))}
.header.scrolled .brand img{width:92px;height:92px}
.brand .b-name{line-height:1.05}
.brand .b-name b{display:block;font-size:1.12rem;background:var(--grad-brand);-webkit-background-clip:text;background-clip:text;color:transparent}
.brand .b-name span{font-size:.7rem;font-weight:600;color:var(--muted);letter-spacing:.05em}
.header:not(.scrolled) .brand .b-name b{background:linear-gradient(120deg,#fff,#cfe1ff);-webkit-background-clip:text;background-clip:text;color:transparent}
.header:not(.scrolled) .brand .b-name span{color:rgba(255,255,255,.8)}
.menu{display:flex;align-items:center;gap:30px;list-style:none}
.menu a{font-weight:600;font-size:.95rem;color:#e8f0ff;position:relative;transition:.2s}
.header.scrolled .menu a{color:var(--slate)}
.menu a:hover{color:var(--orange)}
.menu a::after{content:"";position:absolute;left:0;bottom:-6px;height:2px;width:0;background:var(--grad-flame);transition:.25s}
.menu a:hover::after{width:100%}
.nav .btn{padding:11px 20px;font-size:.9rem}
.burger{display:none;flex-direction:column;gap:5px;background:none;border:none;cursor:pointer;padding:8px}
.burger span{width:26px;height:2.5px;background:#fff;border-radius:2px;transition:.3s}
.header.scrolled .burger span{background:var(--ink)}

/* ===== Hero ===== */
.hero{position:relative;min-height:100vh;display:flex;align-items:center;color:#fff;overflow:hidden;
  background:radial-gradient(1200px 600px at 80% -10%,rgba(43,127,255,.55),transparent 60%),
             radial-gradient(900px 500px at -10% 110%,rgba(255,122,0,.35),transparent 55%),
             linear-gradient(135deg,#041a40,#06306f 45%,#0a3d91)}
.hero::before{content:"";position:absolute;inset:0;background-image:
  linear-gradient(rgba(255,255,255,.05) 1px,transparent 1px),
  linear-gradient(90deg,rgba(255,255,255,.05) 1px,transparent 1px);
  background-size:46px 46px;mask-image:radial-gradient(circle at 70% 40%,#000,transparent 75%);opacity:.6}
.hero .container{position:relative;z-index:2;display:grid;grid-template-columns:1.05fr .95fr;gap:50px;align-items:center;padding-top:160px}
.hero-tag{display:inline-flex;align-items:center;gap:8px;font-weight:600;font-size:.85rem;
  background:rgba(255,255,255,.10);border:1px solid rgba(255,255,255,.25);padding:8px 16px;border-radius:999px;margin-bottom:22px}
.hero-tag .dot{width:8px;height:8px;border-radius:50%;background:var(--green);box-shadow:0 0 0 4px rgba(95,184,0,.3)}
.hero h1{font-size:clamp(2.2rem,4.6vw,3.7rem);font-weight:800}
.hero h1 .grad{background:var(--grad-flame);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero p.lead{margin:22px 0 32px;font-size:1.12rem;color:#d6e2f7;max-width:540px}
.hero-cta{display:flex;gap:14px;flex-wrap:wrap}
.hero-stats{display:flex;gap:34px;margin-top:46px;flex-wrap:wrap}
.hero-stats .num{font-size:2rem;font-weight:800;background:var(--grad-flame);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero-stats small{color:#bcd0f0;font-size:.85rem}

/* hero visual */
.hero-visual{position:relative;display:flex;justify-content:center;align-items:center;min-height:380px}
.orb{position:absolute;border-radius:50%;filter:blur(2px);opacity:.9}
.float-card{position:absolute;background:rgba(255,255,255,.10);border:1px solid rgba(255,255,255,.25);
  backdrop-filter:blur(10px);border-radius:16px;padding:14px 18px;display:flex;align-items:center;gap:12px;
  box-shadow:0 20px 40px -20px rgba(0,0,0,.6);animation:floaty 6s ease-in-out infinite}
.float-card .ic{width:38px;height:38px;border-radius:11px;display:grid;place-items:center;color:#fff;flex:none}
.float-card b{display:block;font-size:.92rem}
.float-card small{color:#c8d8f4;font-size:.74rem}
.fc-1{top:6%;left:0;animation-delay:0s}
.fc-2{bottom:8%;right:2%;animation-delay:1.4s}
.fc-3{bottom:34%;left:6%;animation-delay:2.6s}
@keyframes floaty{0%,100%{transform:translateY(0)}50%{transform:translateY(-16px)}}
.cube-wrap{width:230px;height:230px;perspective:900px}
.cube{width:100%;height:100%;position:relative;transform-style:preserve-3d;animation:spin 16s linear infinite}
.cube .face{position:absolute;inset:0;border:2px solid rgba(255,255,255,.35);border-radius:18px;
  background:linear-gradient(135deg,rgba(43,127,255,.55),rgba(10,61,145,.65));
  display:grid;place-items:center;box-shadow:inset 0 0 40px rgba(43,127,255,.4)}
.cube .face img{width:60%;filter:drop-shadow(0 8px 18px rgba(0,0,0,.4))}
.cube .f-front{transform:translateZ(115px)}
.cube .f-back{transform:rotateY(180deg) translateZ(115px)}
.cube .f-right{transform:rotateY(90deg) translateZ(115px)}
.cube .f-left{transform:rotateY(-90deg) translateZ(115px)}
.cube .f-top{transform:rotateX(90deg) translateZ(115px)}
.cube .f-bottom{transform:rotateX(-90deg) translateZ(115px)}
@keyframes spin{from{transform:rotateX(-18deg) rotateY(0)}to{transform:rotateX(-18deg) rotateY(360deg)}}
.scroll-hint{position:absolute;bottom:26px;left:50%;transform:translateX(-50%);z-index:2;color:#bcd0f0;font-size:.8rem;text-align:center}
.scroll-hint .mouse{width:24px;height:38px;border:2px solid rgba(255,255,255,.5);border-radius:14px;margin:0 auto 8px;position:relative}
.scroll-hint .mouse::after{content:"";position:absolute;top:7px;left:50%;transform:translateX(-50%);width:4px;height:8px;background:#fff;border-radius:2px;animation:wheel 1.6s infinite}
@keyframes wheel{0%{opacity:1;top:7px}100%{opacity:0;top:18px}}

/* ===== Logo strip / trust ===== */
.strip{background:var(--blue-900);color:#cfe0ff;padding:26px 0}
.strip .container{display:flex;align-items:center;justify-content:space-between;gap:24px;flex-wrap:wrap}
.strip b{color:#fff}
.strip .items{display:flex;gap:34px;flex-wrap:wrap;font-weight:600;font-size:.95rem}
.strip .items span{display:flex;align-items:center;gap:8px}
.strip .items svg{width:18px;height:18px;color:var(--yellow)}

/* ===== About ===== */
.about-grid{display:grid;grid-template-columns:1fr 1fr;gap:54px;align-items:center}
.about-visual{position:relative}
.about-visual .frame{border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);
  background:var(--grad-brand);aspect-ratio:4/3;display:grid;place-items:center;position:relative}
.about-visual .frame img{width:52%;filter:drop-shadow(0 14px 30px rgba(0,0,0,.4))}
.about-visual .frame::after{content:"";position:absolute;inset:0;background:
  radial-gradient(400px 200px at 20% 20%,rgba(255,122,0,.4),transparent 60%)}
.about-badge{position:absolute;right:-14px;bottom:-18px;background:#fff;border-radius:16px;padding:16px 20px;
  box-shadow:var(--shadow);display:flex;align-items:center;gap:14px}
.about-badge .big{font-size:1.8rem;font-weight:800;color:var(--blue-600)}
.about-badge small{color:var(--muted);font-size:.8rem;display:block}
.about h2{margin-bottom:18px}
.about p{color:var(--slate);margin-bottom:16px}
.about .feature-list{list-style:none;display:grid;gap:14px;margin-top:24px}
.about .feature-list li{display:flex;gap:13px;align-items:flex-start}
.about .feature-list .tick{flex:none;width:26px;height:26px;border-radius:50%;background:rgba(95,184,0,.15);
  color:var(--green-600);display:grid;place-items:center;margin-top:2px}
.about .feature-list .tick svg{width:15px;height:15px}
.about .feature-list b{font-weight:700}
.about .feature-list span{color:var(--muted);font-size:.92rem}

/* ===== Services ===== */
.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:30px 26px;transition:.3s;position:relative;overflow:hidden}
.card::before{content:"";position:absolute;inset:0 0 auto 0;height:4px;background:var(--grad-flame);transform:scaleX(0);transform-origin:left;transition:.3s}
.card:hover{transform:translateY(-8px);box-shadow:var(--shadow);border-color:transparent}
.card:hover::before{transform:scaleX(1)}
.card .ic{width:56px;height:56px;border-radius:15px;display:grid;place-items:center;color:#fff;margin-bottom:20px}
.card .ic svg{width:28px;height:28px}
.card h3{font-size:1.18rem;margin-bottom:10px}
.card p{color:var(--muted);font-size:.95rem}
.card .tag{display:inline-block;margin-top:14px;font-size:.72rem;font-weight:700;color:var(--blue-600);
  background:rgba(43,127,255,.08);padding:4px 10px;border-radius:6px}
.ic-blue{background:var(--grad-brand)}
.ic-orange{background:linear-gradient(135deg,var(--orange),var(--red))}
.ic-green{background:linear-gradient(135deg,var(--green),var(--green-600))}
.ic-violet{background:linear-gradient(135deg,#7c3aed,#4f46e5)}
.ic-cyan{background:linear-gradient(135deg,#06b6d4,#0ea5e9)}
.ic-amber{background:linear-gradient(135deg,var(--yellow),var(--orange))}

/* ===== Projects ===== */
.projects{display:grid;grid-template-columns:1fr 1fr;gap:28px}
.project{position:relative;border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);min-height:340px;
  display:flex;flex-direction:column;justify-content:flex-end;color:#fff;isolation:isolate}
.project .pbg{position:absolute;inset:0;z-index:-2}
.project .p1{background:radial-gradient(600px 300px at 30% 20%,rgba(255,122,0,.55),transparent 60%),linear-gradient(135deg,#0a3d91,#062a63)}
.project .p2{background:radial-gradient(600px 300px at 70% 20%,rgba(95,184,0,.5),transparent 60%),linear-gradient(135deg,#06306f,#041a40)}
.project::after{content:"";position:absolute;inset:0;z-index:-1;background:linear-gradient(to top,rgba(4,16,40,.85),transparent 65%)}
.project .ptype{position:absolute;top:18px;left:18px;font-size:.74rem;font-weight:700;letter-spacing:.05em;
  background:rgba(255,255,255,.16);border:1px solid rgba(255,255,255,.3);backdrop-filter:blur(6px);padding:6px 13px;border-radius:999px}
.project .pmark{position:absolute;top:0;right:0;width:160px;height:160px;opacity:.18;
  background:repeating-linear-gradient(45deg,#fff 0 2px,transparent 2px 12px);mask-image:radial-gradient(circle at 100% 0,#000,transparent 70%)}
.project .pbody{padding:28px}
.project h3{font-size:1.45rem;margin-bottom:8px}
.project p{color:#d6e2f7;font-size:.95rem;margin-bottom:18px}
.project .plink{display:inline-flex;align-items:center;gap:9px;font-weight:700;color:#fff;
  border:1.5px solid rgba(255,255,255,.45);padding:11px 20px;border-radius:999px;transition:.25s;width:fit-content}
.project .plink:hover{background:var(--grad-flame);border-color:transparent;transform:translateX(4px)}
.project .plink svg{width:16px;height:16px}

/* ===== Process ===== */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:22px;counter-reset:step}
.step{position:relative;padding:30px 24px;background:var(--card);border:1px solid var(--line);border-radius:var(--radius)}
.step .n{counter-increment:step;font-size:2.4rem;font-weight:800;line-height:1;
  background:var(--grad-flame);-webkit-background-clip:text;background-clip:text;color:transparent}
.step .n::before{content:"0" counter(step)}
.step h3{font-size:1.08rem;margin:12px 0 8px}
.step p{color:var(--muted);font-size:.9rem}

/* ===== Why / stats band ===== */
.band{background:var(--grad-brand);color:#fff;border-radius:26px;padding:54px;position:relative;overflow:hidden}
.band::before{content:"";position:absolute;right:-60px;top:-60px;width:260px;height:260px;border-radius:50%;background:radial-gradient(circle,rgba(255,122,0,.55),transparent 70%)}
.band .grid{display:grid;grid-template-columns:repeat(4,1fr);gap:30px;position:relative;z-index:1;text-align:center}
.band .num{font-size:2.6rem;font-weight:800}
.band .num .grad{background:linear-gradient(120deg,var(--yellow),var(--orange));-webkit-background-clip:text;background-clip:text;color:transparent}
.band small{color:#cfe0ff}

/* ===== Contact ===== */
.contact-grid{display:grid;grid-template-columns:1fr 1.1fr;gap:46px;align-items:start}
.info-card{background:var(--grad-brand);color:#fff;border-radius:var(--radius);padding:36px;box-shadow:var(--shadow)}
.info-card h3{font-size:1.4rem;margin-bottom:8px}
.info-card .sub{color:#cfe0ff;margin-bottom:26px}
.info-list{list-style:none;display:grid;gap:20px}
.info-list li{display:flex;gap:15px;align-items:flex-start}
.info-list .ic{flex:none;width:44px;height:44px;border-radius:12px;background:rgba(255,255,255,.14);display:grid;place-items:center}
.info-list .ic svg{width:20px;height:20px}
.info-list small{color:#bcd0f0;display:block;font-size:.78rem;text-transform:uppercase;letter-spacing:.06em}
.info-list b{font-weight:600;font-size:1rem;word-break:break-word}
.info-list a:hover{color:var(--yellow)}
.legal{margin-top:26px;padding-top:22px;border-top:1px solid rgba(255,255,255,.2);font-size:.82rem;color:#bcd0f0}
.form{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:36px;box-shadow:var(--shadow)}
.form h3{font-size:1.3rem;margin-bottom:6px}
.form .sub{color:var(--muted);margin-bottom:24px;font-size:.95rem}
.field{margin-bottom:18px}
.field label{display:block;font-weight:600;font-size:.86rem;margin-bottom:7px}
.field input,.field textarea,.field select{width:100%;font-family:inherit;font-size:.95rem;padding:13px 15px;
  border:1.5px solid var(--line);border-radius:12px;background:#fbfcfe;transition:.2s;color:var(--ink)}
.field input:focus,.field textarea:focus,.field select:focus{outline:none;border-color:var(--blue-500);background:#fff;box-shadow:0 0 0 4px rgba(43,127,255,.12)}
.field textarea{resize:vertical;min-height:110px}
.row2{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.form .btn{width:100%;justify-content:center;margin-top:6px}
.form-note{font-size:.82rem;color:var(--muted);margin-top:14px;text-align:center}
.form-ok{display:none;background:rgba(95,184,0,.12);color:#2f7d00;border:1px solid rgba(95,184,0,.3);
  padding:14px;border-radius:12px;margin-top:16px;font-weight:600;font-size:.9rem;text-align:center}

/* ===== Footer ===== */
.footer{background:var(--blue-900);color:#aebfdb;padding:64px 0 28px}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.2fr;gap:36px}
.footer .brand .b-name b{background:linear-gradient(120deg,#fff,#cfe1ff);-webkit-background-clip:text;background-clip:text;color:transparent}
.footer .brand .b-name span{color:#7e93bd}
.footer p{margin-top:16px;font-size:.92rem;max-width:320px}
.footer h4{color:#fff;font-size:1rem;margin-bottom:18px}
.footer ul{list-style:none;display:grid;gap:11px}
.footer ul a,.footer ul li{font-size:.92rem;transition:.2s}
.footer ul a:hover{color:var(--yellow)}
.footer .social{display:flex;gap:12px;margin-top:18px}
.footer .social a{width:40px;height:40px;border-radius:11px;background:rgba(255,255,255,.08);display:grid;place-items:center;transition:.25s}
.footer .social a:hover{background:var(--grad-flame)}
.footer .social svg{width:18px;height:18px;color:#fff}
.footer-bottom{margin-top:48px;padding-top:24px;border-top:1px solid rgba(255,255,255,.1);
  display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;font-size:.85rem}

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

/* floating contact button */
.fab{position:fixed;right:22px;bottom:22px;z-index:40;display:flex;flex-direction:column;gap:12px}
.fab a{width:54px;height:54px;border-radius:50%;display:grid;place-items:center;color:#fff;box-shadow:0 12px 28px -10px rgba(0,0,0,.5);transition:.25s}
.fab a:hover{transform:scale(1.08)}
.fab .call{background:var(--grad-flame);animation:pulse 2s infinite}
.fab .zalo{background:linear-gradient(135deg,#0068ff,#00a6ff);font-weight:800;font-size:.7rem}
.fab svg{width:24px;height:24px}
@keyframes pulse{0%{box-shadow:0 0 0 0 rgba(255,94,0,.5)}70%{box-shadow:0 0 0 16px rgba(255,94,0,0)}100%{box-shadow:0 0 0 0 rgba(255,94,0,0)}}

/* ===== Responsive ===== */
@media(max-width:980px){
  .hero .container,.about-grid,.contact-grid{grid-template-columns:1fr}
  .hero-visual{order:-1;min-height:300px;margin-bottom:10px}
  .cards,.footer-grid{grid-template-columns:repeat(2,1fr)}
  .steps,.band .grid{grid-template-columns:repeat(2,1fr)}
  .projects{grid-template-columns:1fr}
  .about-visual{max-width:480px;margin:0 auto}
}
@media(max-width:680px){
  .section{padding:64px 0}
  .menu{position:fixed;inset:0 0 0 auto;width:78%;max-width:320px;background:#06306f;flex-direction:column;
    align-items:flex-start;justify-content:flex-start;padding:90px 30px;gap:22px;transform:translateX(100%);transition:.32s;box-shadow:-20px 0 50px rgba(0,0,0,.4)}
  .menu.open{transform:none}
  .menu a{color:#fff!important;font-size:1.05rem}
  .burger{display:flex;z-index:60}
  .nav .btn{display:none}
  .cards,.footer-grid,.band .grid,.steps,.row2{grid-template-columns:1fr}
  .band{padding:36px 26px}
  .hero-stats{gap:24px}
  .footer-bottom{flex-direction:column}
  .brand img,.header.scrolled .brand img{width:78px;height:78px}
}