:root{
    --ink:#1d1d1f;
    --black:#0a0a0a;
    --fog:#f5f5f7;
    --white:#ffffff;
    --graphite:#6e6e73;
    --slate:#86868b;
    --hair:rgba(0,0,0,.10);
    --hair-d:rgba(255,255,255,.14);
    --steel:#7d8a93;        /* холодный сдержанный акцент */
    --maxw:1200px;
    --ease:cubic-bezier(.22,.61,.36,1);
  }
  *{margin:0;padding:0;box-sizing:border-box}
  html{scroll-behavior:smooth}
  body{
    font-family:-apple-system,BlinkMacSystemFont,"Inter","Segoe UI",sans-serif;
    color:var(--ink);background:var(--white);
    -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
    line-height:1.5;overflow-x:hidden;
  }
  a{color:inherit;text-decoration:none}
  .wrap{max-width:var(--maxw);margin:0 auto;padding:0 28px}

  /* NAV */
  nav{position:fixed;top:0;left:0;right:0;z-index:100;height:52px;display:flex;align-items:center;
    background:rgba(245,245,247,.72);backdrop-filter:saturate(180%) blur(20px);border-bottom:1px solid var(--hair)}
  nav .wrap{display:flex;align-items:center;justify-content:space-between;width:100%}
  .brand{font-weight:400;font-size:15px;letter-spacing:.18em;text-transform:uppercase;display:flex;align-items:center;gap:11px;color:var(--ink)}
  .logo-mark{height:21px;width:auto;color:var(--ink);flex:none}
  .logo-hero{height:clamp(56px,8.5vw,80px);width:auto;color:var(--ink);margin-bottom:26px;overflow:visible}
  .logo-hero .ln{stroke-dasharray:100;stroke-dashoffset:100;animation:draw .6s var(--ease) var(--d,0s) forwards}
  .logo-hero .step{opacity:0;transform-box:fill-box;transform-origin:center;animation:pop .4s var(--ease) var(--d,0s) forwards}
  @keyframes draw{to{stroke-dashoffset:0}}
  @keyframes pop{from{opacity:0;transform:scale(.3)}to{opacity:1;transform:scale(1)}}
  .nav-links{display:flex;gap:30px;font-size:13px;color:var(--graphite)}
  .nav-links a{transition:color .25s}.nav-links a:hover{color:var(--ink)}
  @media(max-width:720px){.nav-links{display:none}}

  /* HERO */
  .hero{min-height:100vh;min-height:100dvh;display:flex;flex-direction:column;align-items:center;justify-content:safe center;text-align:center;
    background:radial-gradient(120% 90% at 50% 0%,#fbfbfd 0%,var(--fog) 55%,#ececef 100%);position:relative;padding:132px 28px 80px}
  .eyebrow{font-size:13px;letter-spacing:.06em;text-transform:uppercase;color:var(--steel);font-weight:500;margin-bottom:22px}
  .hero h1{font-weight:600;letter-spacing:-.035em;line-height:1.04;font-size:clamp(46px,9vw,104px);color:var(--ink);max-width:16ch}
  .hero h1 .metal{background:linear-gradient(180deg,#44474c 0%,#9499a0 40%,#dfe2e6 54%,#888d94 70%,#34373b 100%);
    -webkit-background-clip:text;background-clip:text;color:transparent}
  .hero p.sub{margin-top:28px;font-size:clamp(18px,2.4vw,24px);color:var(--graphite);max-width:34ch;line-height:1.4}
  .cta-row{margin-top:40px;display:flex;gap:16px;flex-wrap:wrap;justify-content:center}
  .btn{font-size:15px;padding:12px 24px;border-radius:980px;transition:.25s var(--ease)}
  .btn-primary{background:var(--ink);color:#fff}.btn-primary:hover{background:#000;transform:translateY(-1px)}
  .btn-ghost{color:var(--ink)}.btn-ghost:hover{color:var(--steel)}.btn-ghost::after{content:" ›";opacity:.6}
  .scroll-cue{position:absolute;bottom:30px;left:50%;transform:translateX(-50%);font-size:12px;color:var(--slate);
    display:flex;flex-direction:column;align-items:center;gap:8px;opacity:.85}
  .mouse{width:22px;height:34px;border:1.5px solid var(--slate);border-radius:12px;position:relative}
  .mouse::after{content:"";position:absolute;top:6px;left:50%;width:3px;height:6px;border-radius:2px;background:var(--slate);transform:translateX(-50%);animation:wheel 1.6s infinite}
  @keyframes wheel{0%{opacity:0;transform:translate(-50%,0)}40%{opacity:1}100%{opacity:0;transform:translate(-50%,9px)}}

  /* STATEMENT */
  .statement{padding:clamp(100px,15vw,190px) 0;text-align:center;background:var(--white)}
  .statement h2{font-weight:500;letter-spacing:-.03em;line-height:1.18;font-size:clamp(28px,4.6vw,52px);max-width:20ch;margin:0 auto}
  .statement h2 b{font-weight:500;color:var(--slate)}

  /* PRODUCTS + TABS */
  .products{background:var(--fog)}
  .products .head{text-align:center;padding:clamp(80px,11vw,140px) 0 36px}
  .products .head h2{font-weight:600;letter-spacing:-.03em;font-size:clamp(32px,5vw,56px)}
  .products .head p{color:var(--graphite);margin-top:14px;font-size:18px}
  .prodnav{position:sticky;top:52px;z-index:90;display:flex;justify-content:center;gap:8px;padding:14px 0;
    background:rgba(245,245,247,.8);backdrop-filter:saturate(180%) blur(20px);border-bottom:1px solid var(--hair)}
  .tab{font-size:15px;color:var(--graphite);padding:9px 22px;border-radius:980px;cursor:pointer;transition:.25s var(--ease);border:1px solid transparent}
  .tab:hover{color:var(--ink)}
  .tab.active{background:var(--ink);color:#fff}
  .product[hidden]{display:none}

  /* PRODUCT HERO + STICKY TRANSFORMER (light) */
  .phead{text-align:center;padding:70px 28px 10px}
  .phead .k{font-size:13px;letter-spacing:.14em;text-transform:uppercase;color:var(--steel);font-weight:500}
  .phead h3{font-weight:600;letter-spacing:-.03em;font-size:clamp(34px,6vw,68px);margin:10px 0 6px}
  .phead .tg{color:var(--graphite);font-size:clamp(17px,2.2vw,21px)}
  .phead .from{margin-top:14px;font-size:14px;color:var(--slate)}

  .showcase{position:relative;background:radial-gradient(130% 100% at 50% 28%,#d6dadf 0%,#b0b6bd 55%,#8d949c 100%)}
  .showcase .track{height:300vh}
  .showcase .sticky{position:sticky;top:52px;height:calc(100vh - 52px);height:calc(100dvh - 52px);display:flex;align-items:center;justify-content:center;overflow:hidden;padding:74px 0 18vh;padding-bottom:18dvh;box-sizing:border-box}
  .stage{position:relative;width:min(660px,84vw);aspect-ratio:1/1;display:flex;align-items:center;justify-content:center}
  .ring{position:absolute;inset:-4%;border-radius:50%;border:1px solid rgba(0,0,0,.13);will-change:transform}
  .ring.r2{inset:-15%;border-color:rgba(0,0,0,.07)}
  /* WHITE aluminum device placeholder */
  .device{width:60%;height:72%;border-radius:42px;position:relative;will-change:transform;
    background:linear-gradient(150deg,#ffffff 0%,#f3f4f6 28%,#e0e3e8 52%,#ffffff 72%,#e7eaee 100%);
    box-shadow:0 38px 90px rgba(0,0,0,.16),inset 0 1px 2px rgba(255,255,255,.95),inset 0 -3px 9px rgba(0,0,0,.07);
    border:1px solid rgba(0,0,0,.05)}
  .device::before{content:"";position:absolute;inset:14px;border-radius:30px;background:linear-gradient(160deg,rgba(255,255,255,.7),rgba(255,255,255,0) 42%)}
  .device::after{content:"White aluminum · STEP";position:absolute;bottom:18px;left:0;right:0;text-align:center;font-size:11px;letter-spacing:.16em;color:rgba(0,0,0,.34)}
  .device-3d{position:absolute;inset:0;width:100%;height:100%;background:transparent;border:0;outline:none;z-index:2}
  .stage-full{position:relative;width:min(880px,92vw);aspect-ratio:7/5;z-index:1}
  .loader3d{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:14px;z-index:5;transition:opacity .5s ease}
  .loader3d.gone{opacity:0;pointer-events:none}
  .loader3d .spin{width:34px;height:34px;border:2px solid rgba(0,0,0,.12);border-top-color:var(--ink);border-radius:50%;animation:spin3d .8s linear infinite}
  @keyframes spin3d{to{transform:rotate(360deg)}}
  .loader3d .lt{font-size:12px;letter-spacing:.14em;text-transform:uppercase;color:var(--slate)}
  .frames{position:absolute;left:0;right:0;bottom:5vh;bottom:5dvh;text-align:center;pointer-events:none;z-index:3}
  @media(max-width:700px){
    .stage-full{width:98vw;aspect-ratio:1/1;margin-top:-6dvh}
    .frames{bottom:3dvh;padding:0 14px}
    .frame h4{font-size:clamp(24px,7vw,32px)}
    .frame p{font-size:14px}
  }
  .frame{position:absolute;left:0;right:0;bottom:0;opacity:0;transition:opacity .5s var(--ease),transform .5s var(--ease);transform:translateY(14px)}
  .frame.active{opacity:1;transform:translateY(0)}
  .frame .k{font-size:13px;letter-spacing:.16em;text-transform:uppercase;color:var(--steel);margin-bottom:10px}
  .frame h4{font-weight:600;font-size:clamp(30px,4.6vw,54px);letter-spacing:-.025em;color:var(--ink)}
  .frame p{margin-top:10px;color:rgba(0,0,0,.55);font-size:15px;max-width:36ch;margin:10px auto 0}
  .progress{position:absolute;top:50%;right:30px;transform:translateY(-50%);display:flex;flex-direction:column;gap:10px;z-index:3}
  .progress span{width:5px;height:5px;border-radius:50%;background:rgba(0,0,0,.28);transition:.3s}
  .progress span.on{background:var(--ink);height:18px}

  /* CONFIGURATIONS / PRICING */
  .config{padding:clamp(80px,11vw,140px) 0;background:var(--white)}
  .config .ch{text-align:center;margin-bottom:54px}
  .config .ch h3{font-weight:600;letter-spacing:-.03em;font-size:clamp(28px,4vw,44px)}
  .config .ch p{color:var(--graphite);margin-top:12px;font-size:17px}
  .tiers{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:22px;max-width:900px;margin:0 auto}
  .tier{background:var(--fog);border-radius:26px;padding:34px 30px;border:1px solid var(--hair);transition:.4s var(--ease);opacity:0;transform:translateY(34px)}
  .tier.in{opacity:1;transform:translateY(0)}
  .tier:hover{transform:translateY(-6px)}
  .tier.feat{border:2px solid var(--ink)}
  .tier .badge{display:inline-block;font-size:12px;letter-spacing:.06em;text-transform:uppercase;color:#fff;background:var(--ink);border-radius:980px;padding:5px 14px;margin-bottom:16px}
  .tier h4{font-weight:600;font-size:24px;letter-spacing:-.02em}
  .tier .price{font-size:38px;font-weight:600;letter-spacing:-.03em;margin:10px 0 4px}
  .tier .price small{font-size:14px;color:var(--slate);font-weight:400}
  .tier ul{list-style:none;margin:22px 0 26px;text-align:left}
  .tier li{font-size:15px;color:var(--graphite);padding:9px 0;border-top:1px solid var(--hair);display:flex;gap:10px;align-items:flex-start}
  .tier li::before{content:"›";color:var(--steel)}
  .tier .buy{display:block;text-align:center;border-radius:980px;padding:12px;font-size:15px;background:var(--ink);color:#fff;transition:.25s}
  .tier:not(.feat) .buy{background:transparent;color:var(--ink);border:1px solid var(--ink)}
  .tier .buy:hover{transform:translateY(-1px)}

  /* CRAFT (dark) */
  .craft{background:var(--black);color:#fff;padding:clamp(100px,14vw,170px) 0;text-align:center}
  .craft h2{font-weight:600;letter-spacing:-.03em;font-size:clamp(30px,5vw,54px);max-width:18ch;margin:0 auto}
  .craft h2 .metal{background:linear-gradient(180deg,#54585e,#d6d9dd 50%,#54585e);-webkit-background-clip:text;background-clip:text;color:transparent}
  .craft .lead{color:rgba(255,255,255,.6);max-width:46ch;margin:24px auto 0;font-size:17px}
  .stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(170px,1fr));gap:30px;margin-top:66px}
  .stat .n{font-size:clamp(32px,5vw,50px);font-weight:600;letter-spacing:-.03em}
  .stat .l{color:rgba(255,255,255,.55);font-size:14px;margin-top:8px}

  /* CONTACT */
  .contact{padding:clamp(90px,12vw,150px) 0;text-align:center;background:var(--fog)}
  .contact h2{font-weight:600;letter-spacing:-.03em;font-size:clamp(30px,5vw,52px)}
  .contact p{color:var(--graphite);margin:16px auto 32px;max-width:40ch;font-size:18px}

  footer{background:var(--white);color:var(--graphite);padding:46px 0 40px;font-size:13px;border-top:1px solid var(--hair)}
  footer .wrap{display:flex;justify-content:space-between;flex-wrap:wrap;gap:20px;align-items:center}
  footer .brand{color:var(--ink)}

  /* HOW IT WORKS */
  .how{padding:clamp(90px,12vw,150px) 0;background:var(--white)}
  .how .head,.benefits .head,.specs .head,.faq .head{text-align:center;margin-bottom:56px}
  .how .head h2,.benefits .head h2,.specs .head h2,.faq .head h2{font-weight:600;letter-spacing:-.03em;font-size:clamp(30px,5vw,52px)}
  .how .head p,.benefits .head p{color:var(--graphite);margin-top:14px;font-size:18px}
  .steps{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:26px;max-width:1000px;margin:0 auto}
  .step3{text-align:center;padding:0 10px}
  .step3 .num{width:52px;height:52px;border-radius:50%;border:1.5px solid var(--ink);display:flex;align-items:center;justify-content:center;font-size:20px;font-weight:500;margin:0 auto 22px}
  .step3 h3{font-weight:500;font-size:21px;letter-spacing:-.02em;margin-bottom:8px}
  .step3 p{color:var(--graphite);font-size:15px;line-height:1.6;max-width:30ch;margin:0 auto}
  /* BENEFITS */
  .benefits{padding:clamp(90px,12vw,150px) 0;background:var(--fog)}
  .bgrid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:20px;max-width:1080px;margin:0 auto}
  .bcard{background:var(--white);border:1px solid var(--hair);border-radius:22px;padding:30px 28px;transition:.4s var(--ease)}
  .bcard:hover{transform:translateY(-5px);box-shadow:0 24px 50px rgba(0,0,0,.06)}
  .bcard .ic{width:38px;height:38px;color:var(--steel);margin-bottom:18px}
  .bcard h3{font-weight:500;font-size:19px;letter-spacing:-.01em;margin-bottom:8px}
  .bcard p{color:var(--graphite);font-size:15px;line-height:1.6}
  /* SPECS */
  .specs{padding:clamp(90px,12vw,150px) 0;background:var(--fog)}
  .spectable{max-width:720px;margin:0 auto}
  .specrow{display:flex;justify-content:space-between;gap:24px;padding:18px 4px;border-top:1px solid var(--hair);font-size:16px}
  .specrow:last-child{border-bottom:1px solid var(--hair)}
  .specrow .k{color:var(--graphite)}
  .specrow .v{font-weight:500;text-align:right}
  /* FAQ */
  .faq{padding:clamp(90px,12vw,150px) 0;background:var(--white)}
  .faqlist{max-width:760px;margin:0 auto}
  .faqitem{border-top:1px solid var(--hair)}
  .faqitem:last-child{border-bottom:1px solid var(--hair)}
  .faqitem summary{list-style:none;cursor:pointer;padding:22px 4px;display:flex;justify-content:space-between;align-items:center;gap:20px;font-size:18px;font-weight:500;letter-spacing:-.01em}
  .faqitem summary::-webkit-details-marker{display:none}
  .faqitem summary::after{content:"+";color:var(--steel);font-size:26px;font-weight:300;line-height:1;transition:transform .3s var(--ease)}
  .faqitem[open] summary::after{transform:rotate(45deg)}
  .faqitem p{color:var(--graphite);font-size:15.5px;line-height:1.7;padding:0 4px 22px;max-width:66ch}
  .reveal{opacity:0;transform:translateY(34px);transition:opacity .8s var(--ease),transform .8s var(--ease)}
  .reveal.in{opacity:1;transform:translateY(0)}
  @media(prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}.reveal,.tier{opacity:1;transform:none}
    .logo-hero .ln{stroke-dashoffset:0}.logo-hero .step{opacity:1}}