:root{
    --bg:#0a0a0c; --bg-2:#0f0f12; --panel:#141418;
    --gold:#f7b500; --gold-2:#ffcf33; --gold-deep:#e0a200;
    --white:#ffffff; --muted:#9a9aa2; --line:rgba(255,255,255,.08);
    --ease:cubic-bezier(.22,.61,.36,1);
    --font:'Lexend', 'Hanken Grotesk', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  }
  *{box-sizing:border-box;margin:0;padding:0}
  html{scroll-behavior:smooth;overflow-x:hidden;max-width:100%}
  body{
    font-family:var(--font); background:var(--bg); color:var(--white);
    line-height:1.55; -webkit-font-smoothing:antialiased; overflow-x:hidden;
  }
  a{color:inherit;text-decoration:none}
  img{display:block;max-width:100%}
  ::selection{background:var(--gold);color:#000}

  /* ===== AZSKIN tech background: 2-tier microcircuit grid + giant wordmark + orbs + scanline ===== */
  .bg-layer{position:fixed;inset:0;z-index:0;pointer-events:none}
  /* big grid */
  .grid-far{
    background-image:
      linear-gradient(rgba(247,181,0,.045) 1px, transparent 1px),
      linear-gradient(90deg, rgba(247,181,0,.045) 1px, transparent 1px);
    background-size:88px 88px;
  }
  /* fine grid */
  .grid-near{
    background-image:
      linear-gradient(rgba(255,255,255,.025) 1px, transparent 1px),
      linear-gradient(90deg, rgba(255,255,255,.025) 1px, transparent 1px);
    background-size:22px 22px;
    mask-image:radial-gradient(125% 95% at 50% 8%, #000 0%, transparent 72%);
    -webkit-mask-image:radial-gradient(125% 95% at 50% 8%, #000 0%, transparent 72%);
  }
  .grid-far{
    mask-image:radial-gradient(125% 95% at 50% 8%, #000 0%, transparent 70%);
    -webkit-mask-image:radial-gradient(125% 95% at 50% 8%, #000 0%, transparent 70%);
  }
  /* dot nodes */
  .nodes{
    background-image:radial-gradient(rgba(247,181,0,.16) 1.4px, transparent 1.8px);
    background-size:88px 88px;
    mask-image:radial-gradient(110% 80% at 50% 10%, #000 0%, transparent 65%);
    -webkit-mask-image:radial-gradient(110% 80% at 50% 10%, #000 0%, transparent 65%);
    animation:nodePulse 5s ease-in-out infinite;
  }
  .orb{position:fixed;z-index:0;pointer-events:none;filter:blur(95px);opacity:.5}
  .orb.o1{top:-200px;left:50%;transform:translateX(-50%);width:780px;height:540px;
    background:radial-gradient(closest-side, rgba(247,181,0,.32), transparent 70%)}
  .orb.o2{bottom:-220px;right:-140px;width:580px;height:580px;
    background:radial-gradient(closest-side, rgba(255,207,51,.16), transparent 70%)}
  .orb.o3{top:38%;left:-180px;width:480px;height:480px;
    background:radial-gradient(closest-side, rgba(247,181,0,.10), transparent 70%)}
  /* scanline */
  .scan{position:fixed;inset:0;z-index:1;pointer-events:none;opacity:.5;
    background:repeating-linear-gradient(180deg, transparent 0 3px, rgba(0,0,0,.18) 3px 4px)}
  /* giant AZSKIN wordmark watermark */
  .wordmark{position:fixed;z-index:0;pointer-events:none;left:50%;top:64%;
    transform:translate(-50%,-50%);font-weight:900;letter-spacing:-6px;
    font-size:min(34vw,440px);line-height:.8;color:transparent;
    -webkit-text-stroke:1.5px rgba(247,181,0,.05);white-space:nowrap;user-select:none}

  .wrap{position:relative;z-index:2;max-width:1240px;margin:0 auto;padding:0 24px}

  /* ===== Nav ===== */
  nav{position:fixed;top:0;left:0;right:0;z-index:50;
    backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
    background:linear-gradient(180deg, rgba(10,10,12,.82), rgba(10,10,12,.35));
    border-bottom:1px solid var(--line);transition:transform .4s var(--ease)}
  .nav-in{max-width:1240px;margin:0 auto;padding:14px 24px;display:flex;align-items:center;justify-content:space-between}
  .brand{display:flex;align-items:baseline;gap:1px;font-weight:900;letter-spacing:.5px;font-size:1.32rem}
  .brand .az{color:#fff}.brand .skin{color:var(--gold)}
  .brand sup{font-size:.5rem;letter-spacing:3px;color:var(--muted);font-weight:700;margin-left:8px;align-self:center}
  .nav-links{display:flex;gap:28px;align-items:center}
  .nav-links a{font-size:.9rem;color:var(--muted);font-weight:600;transition:color .25s}
  .nav-links a:hover{color:#fff}
  .nav-cta{background:var(--gold);color:#000;padding:9px 18px;border-radius:10px;font-weight:800;font-size:.88rem;
    box-shadow:0 8px 24px rgba(247,181,0,.30);transition:transform .25s var(--ease),box-shadow .25s}
  .nav-cta:hover{transform:translateY(-2px);box-shadow:0 12px 30px rgba(247,181,0,.45)}
  @media(max-width:760px){.nav-links a:not(.nav-cta){display:none}}

  /* ===== Hero ===== */
  .hero{min-height:100svh;display:grid;grid-template-columns:1.05fr 1fr;align-items:center;gap:40px;
    padding:120px 24px 60px;max-width:1240px;margin:0 auto;position:relative;z-index:2}
  .hero-copy{max-width:560px}
  .eyebrow{display:inline-flex;align-items:center;gap:9px;font-size:.74rem;letter-spacing:3px;
    text-transform:uppercase;font-weight:800;color:var(--gold);
    border:1px solid rgba(247,181,0,.32);padding:7px 14px;border-radius:999px;
    background:rgba(247,181,0,.06);margin-bottom:24px;
    opacity:0;transform:translateY(14px);animation:rise .8s var(--ease) .1s forwards}
  .eyebrow .dot{width:7px;height:7px;border-radius:50%;background:var(--gold);box-shadow:0 0 10px var(--gold)}
  h1{font-size:clamp(2.5rem,5.6vw,4.4rem);line-height:1.02;font-weight:900;letter-spacing:-1.5px;
    margin-bottom:22px;opacity:0;transform:translateY(20px);animation:rise .9s var(--ease) .22s forwards}
  h1 .grad{background:linear-gradient(100deg,var(--gold-2),var(--gold) 45%,var(--gold-deep));
    -webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
  .lead{font-size:1.12rem;color:var(--muted);max-width:480px;margin-bottom:36px;
    opacity:0;transform:translateY(20px);animation:rise .9s var(--ease) .34s forwards}
  .hero-actions{display:flex;gap:16px;flex-wrap:wrap;align-items:center;
    opacity:0;transform:translateY(20px);animation:rise .9s var(--ease) .46s forwards}

  .cta{position:relative;display:inline-flex;align-items:center;gap:12px;
    background:linear-gradient(100deg,var(--gold-2),var(--gold));color:#000;
    font-weight:800;font-size:1.05rem;padding:17px 30px;border-radius:14px;overflow:hidden;
    box-shadow:0 14px 40px rgba(247,181,0,.40);transition:transform .3s var(--ease),box-shadow .3s}
  .cta:hover{transform:translateY(-3px) scale(1.015);box-shadow:0 20px 54px rgba(247,181,0,.55)}
  .cta .shine{position:absolute;top:0;left:-130%;width:60%;height:100%;
    background:linear-gradient(105deg,transparent,rgba(255,255,255,.55),transparent);
    transform:skewX(-18deg);animation:shine 3.4s ease-in-out infinite}
  .cta svg{transition:transform .3s var(--ease)}
  .cta:hover svg{transform:translateX(4px)}
  .ghost{display:inline-flex;align-items:center;gap:9px;color:#fff;font-weight:700;font-size:1rem;
    padding:16px 8px;border-bottom:1px solid transparent;transition:border-color .3s,color .3s}
  .ghost:hover{color:var(--gold)}

  .hero-stats{display:flex;gap:34px;margin-top:48px;
    opacity:0;animation:rise 1s var(--ease) .6s forwards}
  .stat .n{font-size:1.7rem;font-weight:900;color:#fff;line-height:1}
  .stat .n span{color:var(--gold)}
  .stat .l{font-size:.78rem;color:var(--muted);letter-spacing:1px;text-transform:uppercase;margin-top:5px}

  /* ===== Hero stage / big device ===== */
  .stage{position:relative;display:flex;align-items:center;justify-content:center;
    min-height:560px;perspective:1400px;opacity:0;animation:rise 1.1s var(--ease) .4s forwards}
  .stage::after{content:"";position:absolute;bottom:8%;left:50%;transform:translateX(-50%);
    width:60%;height:42px;background:radial-gradient(ellipse, rgba(0,0,0,.7), transparent 70%);
    filter:blur(14px);z-index:0}
  .hero-device{position:relative;width:min(440px,86%);transform-style:preserve-3d;
    transition:transform .5s var(--ease);will-change:transform;cursor:crosshair;
    background:#fff;border-radius:26px;overflow:hidden;box-shadow:0 40px 90px rgba(0,0,0,.5)}
  .hero-device .dev{width:100%}                 /* ảnh sản phẩm fill kín khung */
  .hero-device .dev .base{filter:none}
  .ring{position:absolute;width:118%;aspect-ratio:1/1;border-radius:50%;
    border:1px dashed rgba(247,181,0,.18);left:50%;top:50%;transform:translate(-50%,-50%);
    animation:spin 40s linear infinite}
  .ring.r2{width:138%;border-color:rgba(247,181,0,.10);animation-duration:60s;animation-direction:reverse}
  .hint{position:absolute;bottom:2%;left:50%;transform:translateX(-50%);
    font-size:.74rem;letter-spacing:2px;text-transform:uppercase;color:var(--muted);
    display:flex;align-items:center;gap:8px;z-index:5}
  .hint .pulse{width:8px;height:8px;border-radius:50%;background:var(--gold);
    box-shadow:0 0 0 0 rgba(247,181,0,.6);animation:ping 1.8s ease-out infinite}

  /* ===== device compositor (base + skin + occluder + glare) ===== */
  /* thanh LỌC kho phôi (kiểu azskin: dropdown sáng + nhập chữ, lọc LIVE) */
  .khofilter{display:flex;gap:10px;flex-wrap:wrap;align-items:stretch;margin:0 0 26px}
  .kf-field{position:relative;flex:1 1 240px;min-width:190px}
  .kf-field svg{position:absolute;left:14px;top:50%;transform:translateY(-50%);color:#8a8f99;pointer-events:none}
  .kf-field input{width:100%;height:50px;background:#fff;border:1px solid #fff;border-radius:12px;padding:0 14px 0 42px;color:#161616;font-family:inherit;font-size:.95rem;outline:none}
  .kf-field input::placeholder{color:#8a8f99}
  .kf-field input:focus{box-shadow:0 0 0 2px var(--gold)}
  .kf-sel{flex:1 1 170px;min-width:150px;height:50px;background:#fff;border:none;border-radius:12px;padding:0 38px 0 14px;color:#161616;font-family:inherit;font-size:.93rem;font-weight:600;cursor:pointer;outline:none;appearance:none;-webkit-appearance:none;
    background-image:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='14' height='14' viewBox='0 0 24 24' fill='none' stroke='%23555' stroke-width='2.4' stroke-linecap='round' stroke-linejoin='round'><path d='M6 9l6 6 6-6'/></svg>");background-repeat:no-repeat;background-position:right 13px center}
  .kf-sel:focus{box-shadow:0 0 0 2px var(--gold)}
  .kf-reset{flex:0 0 auto;width:54px;height:50px;border:none;border-radius:12px;background:var(--gold);color:#161616;cursor:pointer;display:grid;place-items:center}
  .kf-reset:hover{filter:brightness(1.06)}
  .khoresults{display:none;grid-template-columns:repeat(auto-fill,minmax(190px,1fr));gap:14px;margin-bottom:10px}
  .khoresults.show{display:grid}
  .kr-card{display:flex;align-items:center;gap:12px;background:linear-gradient(170deg,var(--panel),#0c0c0f);border:1px solid var(--line);border-radius:14px;padding:12px;text-decoration:none;color:#fff;transition:.15s var(--ease)}
  .kr-card:hover{border-color:var(--gold);transform:translateY(-2px)}
  .kr-card img{width:50px;height:50px;object-fit:contain;background:#0d0d10;border-radius:8px;flex:none}
  .kr-card .dn{font-weight:700;font-size:.92rem;line-height:1.2}
  .kr-card .db{font-size:.74rem;color:var(--muted);margin-top:2px}
  .kr-empty{grid-column:1/-1;color:var(--muted);padding:22px;text-align:center;font-weight:600}
  .dev{position:relative;isolation:isolate;aspect-ratio:1/1;width:100%}
  .dev .base{position:relative;z-index:1;width:100%;height:100%;object-fit:contain;
    filter:drop-shadow(0 40px 60px rgba(0,0,0,.65))}
  .dev .bgcolor{position:absolute;inset:0;z-index:2;background:#16110a;opacity:0;transition:opacity .5s var(--ease)}
  .dev .bgcolor.on{opacity:1}
  /* MASK REVEAL: skin lộ qua vòng tròn mềm bám con trỏ (--mx/--my); fade khi hover */
  .dev .skinwrap{position:absolute;inset:0;z-index:3;opacity:0;transition:opacity .26s var(--ease);
    -webkit-mask:radial-gradient(circle at var(--mx,50%) var(--my,50%),#000 0%,#000 var(--r0,18%),transparent var(--r1,35%));
    mask:radial-gradient(circle at var(--mx,50%) var(--my,50%),#000 0%,#000 var(--r0,18%),transparent var(--r1,35%))}
  .dev.lit .skinwrap{opacity:1}
  .dev.full .skinwrap{-webkit-mask:none;mask:none;opacity:1}     /* touch: hiện skin đầy đủ */
  .dev .skin{position:absolute;inset:0;background-size:cover;background-position:center;
    background-repeat:no-repeat;opacity:0;transition:opacity .4s var(--ease)}
  .dev .skin.on{opacity:1}
  .dev .occ{position:absolute;inset:0;z-index:4;width:100%;height:100%;object-fit:contain;pointer-events:none}
  /* glare follows cursor, only on body (clipped by occluder? glare sits above to read as gloss) */
  .dev .glare{position:absolute;inset:0;z-index:5;pointer-events:none;opacity:0;
    mix-blend-mode:screen;transition:opacity .4s var(--ease);
    background:radial-gradient(150px 150px at var(--mx,50%) var(--my,40%),
      rgba(255,255,255,.20), rgba(255,255,255,.04) 40%, transparent 66%)}
  .dev.lit .glare{opacity:1}

  /* ===== Strip section ===== */
  .section{position:relative;z-index:2;padding:90px 0}
  .sec-head{text-align:center;max-width:680px;margin:0 auto 56px}
  .sec-head .kick{font-size:.76rem;letter-spacing:3px;text-transform:uppercase;color:var(--gold);font-weight:800;margin-bottom:14px}
  .sec-head h2{font-size:clamp(1.9rem,3.6vw,2.9rem);font-weight:900;letter-spacing:-.5px;margin-bottom:14px}
  .sec-head p{color:var(--muted);font-size:1.05rem}

  .grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
  @media(max-width:980px){.grid{grid-template-columns:repeat(2,1fr)}}
  @media(max-width:560px){.grid{grid-template-columns:1fr}}
  .card{position:relative;background:#fff;
    border:1px solid rgba(0,0,0,.08);border-radius:20px;padding:0;overflow:hidden;
    transition:transform .4s var(--ease),border-color .4s,box-shadow .4s;cursor:crosshair;display:block}
  .card::before{content:"";position:absolute;inset:0;border-radius:20px;padding:1px;
    background:linear-gradient(140deg,rgba(247,181,0,.5),transparent 40%);
    -webkit-mask:linear-gradient(#000 0 0) content-box,linear-gradient(#000 0 0);
    -webkit-mask-composite:xor;mask-composite:exclude;opacity:0;transition:opacity .4s;pointer-events:none}
  .card:hover{transform:translateY(-8px);border-color:rgba(247,181,0,.25);
    box-shadow:0 30px 60px rgba(0,0,0,.5)}
  .card:hover::before{opacity:1}
  .card .stagebox{position:relative;display:flex;align-items:center;justify-content:center;
    padding:0;perspective:1000px}
  .card .dev{width:100%;transform-style:preserve-3d;transition:transform .45s var(--ease);will-change:transform}
  .card .dev .base{filter:none}   /* ảnh sản phẩm fill kín khung */
  .card .meta{display:flex;align-items:flex-end;justify-content:space-between;padding:12px 16px 16px}
  .card h3{font-size:1.12rem;font-weight:800;color:#161616}
  .card .tag{font-size:.78rem;color:#6b7280;margin-top:3px}
  .card .go{width:38px;height:38px;border-radius:50%;display:grid;place-items:center;flex:0 0 auto;
    background:rgba(247,181,0,.10);border:1px solid rgba(247,181,0,.3);color:var(--gold);
    transition:background .3s,transform .3s,color .3s}
  .card:hover .go{background:var(--gold);color:#000;transform:rotate(-45deg)}

  /* ===== How it works ===== */
  .steps{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
  @media(max-width:820px){.steps{grid-template-columns:1fr}}
  .step{background:rgba(255,255,255,.02);border:1px solid var(--line);border-radius:18px;padding:30px 26px}
  .step .num{font-size:2.4rem;font-weight:900;color:transparent;-webkit-text-stroke:1.4px var(--gold);line-height:1;margin-bottom:18px}
  .step h4{font-size:1.16rem;font-weight:800;margin-bottom:8px}
  .step p{color:var(--muted);font-size:.96rem}

  /* ===== Final CTA band ===== */
  .band{position:relative;z-index:2;margin:40px auto 90px;max-width:1100px;
    border-radius:28px;overflow:hidden;text-align:center;padding:72px 28px;
    background:radial-gradient(120% 140% at 50% 0%, rgba(247,181,0,.16), transparent 60%),linear-gradient(180deg,#121117,#0b0b0e);
    border:1px solid rgba(247,181,0,.2)}
  .band h2{font-size:clamp(2rem,4vw,3rem);font-weight:900;letter-spacing:-.5px;margin-bottom:16px}
  .band p{color:var(--muted);font-size:1.1rem;max-width:520px;margin:0 auto 34px}

  footer{position:relative;z-index:2;border-top:1px solid var(--line);padding:34px 24px;text-align:center;color:var(--muted);font-size:.86rem}
  footer .brand{justify-content:center;margin-bottom:10px;font-size:1.1rem}

  /* ===== animations ===== */
  @keyframes rise{to{opacity:1;transform:none}}
  @keyframes shine{0%{left:-130%}55%,100%{left:160%}}
  @keyframes spin{to{transform:translate(-50%,-50%) rotate(360deg)}}
  @keyframes ping{0%{box-shadow:0 0 0 0 rgba(247,181,0,.5)}70%{box-shadow:0 0 0 12px rgba(247,181,0,0)}100%{box-shadow:0 0 0 0 rgba(247,181,0,0)}}
  @keyframes nodePulse{0%,100%{opacity:.55}50%{opacity:.95}}

  @media(max-width:920px){
    .hero{grid-template-columns:1fr;text-align:center;padding-top:110px}
    .hero-copy{margin:0 auto}.lead{margin-left:auto;margin-right:auto}
    .hero-actions{justify-content:center}.hero-stats{justify-content:center}
    .stage{min-height:440px;order:-1}
    .hint{position:static;transform:none;margin-top:14px;justify-content:center}
  }
  @media(max-width:600px){
    .wrap{padding:0 18px}
    nav{padding:12px 18px}
    .brand{font-size:1.18rem}
    .section{padding:56px 0}
    h1{font-size:clamp(2.05rem,8.6vw,3rem);letter-spacing:-1px}
    .lead{font-size:1rem;margin-bottom:24px}
    .sec-head h2{font-size:clamp(1.55rem,6.6vw,2.2rem)}
    .sec-head p{font-size:.9rem}
    .hero{padding-top:92px}
    .hero-actions{gap:12px}
    .hero-actions .cta,.hero-actions .ghost{width:100%;justify-content:center}
    .hero-stats{gap:18px}
    .stage{min-height:350px}
    /* thanh lọc: xếp dọc full-width cho gọn trên điện thoại */
    .khofilter{gap:8px}
    .kf-field,.kf-sel{flex:1 1 100%;height:48px}
    .kf-reset{width:100%;height:46px}
    .khoresults{grid-template-columns:1fr 1fr;gap:10px}
    .kr-card{padding:10px;gap:10px}
    .kr-card img{width:42px;height:42px}
    .band{padding:30px 20px}
    /* co decor để không tràn ngang */
    .orb{filter:blur(70px)}
    .orb.o1{width:520px;height:380px;top:-150px}
    .orb.o2{right:-70px;bottom:-150px;width:360px;height:360px}
    .orb.o3{left:-90px;width:300px;height:300px}
    .wordmark{font-size:min(48vw,260px)}
  }
  @media(max-width:380px){ .khoresults{grid-template-columns:1fr} }

  @media(prefers-reduced-motion:reduce){
    *{animation-duration:.001ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}
    .ring,.cta .shine,.hint .pulse,.nodes,.scan{display:none}
    .eyebrow,h1,.lead,.hero-actions,.hero-stats,.stage{opacity:1!important;transform:none!important}
  }