:root{
  --bg:#f9f9f9;--bg2:#f1f1f1;--w:#fff;--k:#000;--k2:#1a1a1a;--k3:#2b2b2b;--t:#1d1d1d;--m:#6b6b6b;--l:#e2e2e2;
  --f:"Nunito Sans",-apple-system,"Segoe UI",Arial,sans-serif;--max:1240px;
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:80px;-webkit-text-size-adjust:100%}
body{margin:0;font-family:var(--f);font-size:16px;line-height:1.55;color:var(--t);background:var(--bg);overflow-x:hidden}
img{max-width:100%;height:auto;display:block}
a{color:inherit}
h1,h2,h3,h4{margin:0;line-height:1.2;color:var(--k)}
h2{font-size:clamp(26px,2.6vw,34px);font-weight:700;letter-spacing:-.01em}
h3{font-size:18px;font-weight:700}
p{margin:0 0 1em}
svg{width:22px;height:22px;fill:none;stroke:currentColor;stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round;flex:none}
.wrap{max-width:var(--max);margin:0 auto;padding:0 40px}
section{position:relative}
:focus-visible{outline:2px solid var(--k);outline-offset:3px}

/* кнопки як на stelio.com.ua: чорні, радіус 6, звичайний регістр */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;font:700 15px/1.2 var(--f);text-decoration:none;padding:15px 24px;border-radius:6px;border:1px solid transparent;cursor:pointer;transition:background .2s,color .2s,border-color .2s;text-align:center}
.btn--dark{background:var(--k);color:#fff}
.btn--dark:hover{background:#333}
.btn--line{border-color:var(--k);color:var(--k);background:transparent}
.btn--line:hover{background:var(--k);color:#fff}
.btn--white{background:#fff;color:var(--k)}
.btn--white:hover{background:#e9e9e9}
.btn svg{width:20px;height:20px}

/* topbar + header */
.topbar{font-size:13px;background:var(--bg2)}
.topbar__in{display:flex;justify-content:space-between;align-items:center;height:34px}
.topbar a{font-weight:800;text-decoration:none;font-size:15px}
.dot{display:inline-block;width:7px;height:7px;border-radius:50%;background:#2fbf4f;margin-right:8px;vertical-align:1px}
.topbar__mid{display:flex;align-items:center;gap:6px}
.topbar__mid svg{width:15px;height:15px;color:#e53935;fill:#e53935;stroke:none}
.hdr{position:sticky;top:0;z-index:50;background:rgba(249,249,249,.96);backdrop-filter:blur(8px);transition:box-shadow .2s}
.hdr.is-shadow{box-shadow:0 1px 0 var(--l)}
.hdr__in{display:flex;align-items:center;gap:40px;height:72px}
.logo img{width:96px}
.nav{display:flex;gap:34px;margin:0 auto;font-size:15px;color:#444}
.nav a{text-decoration:none}
.nav a:hover{color:var(--k);text-decoration:underline;text-underline-offset:5px}
.hdr__calc{padding:10px 16px;font-size:14px;font-weight:600}
.hdr__tel,.burger{display:none}

/* hero */
.hero{padding:44px 0 70px}
.hero__row{display:grid;grid-template-columns:1.25fr 1fr;gap:40px 70px;align-items:end}
.hero h1{font-size:clamp(44px,6.2vw,84px);font-weight:300;line-height:1.02;letter-spacing:-.02em}
.hero__price{font-size:clamp(20px,2vw,24px);margin:34px 0 4px}
.hero__price b{font-weight:800}
.hero__small{font-size:13.5px;color:var(--m);margin:0}
.hero__side p{font-size:18px;line-height:1.55}
.hero__btns{display:flex;flex-wrap:wrap;gap:12px}
.hero__img{margin:40px 0 0;border-radius:6px;overflow:hidden}
.hero__img img{width:100%;aspect-ratio:21/8;object-fit:cover;object-position:center 40%}
.hero__trust{display:grid;grid-template-columns:1fr 1fr auto;gap:30px 50px;margin-top:34px;align-items:start;font-size:15px}
.hero__trust p{margin:0}
.rating{display:flex;flex-direction:column;gap:4px;text-decoration:none}
.rating>span:first-child{font-weight:800;font-size:18px}
.rating__row{display:flex;align-items:center;gap:8px;font-size:14px;color:var(--m)}
.rating__row b{font-size:16px;color:var(--k)}
.stars{display:flex;gap:2px;color:#f6b500}
.stars svg{width:18px;height:18px;fill:currentColor;stroke:none}

.sec-head{display:grid;grid-template-columns:1fr 1fr;gap:20px 70px;align-items:start;margin-bottom:40px}
.sec-head p{margin:0;font-size:16.5px;color:#333}

/* полотна */
.canv{padding:80px 0;background:var(--w)}
.cards3{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.card img{width:100%;aspect-ratio:4/3;object-fit:cover;border-radius:6px}
.card__b{padding:20px 4px 0}
.card h3{margin-bottom:8px}
.card p{font-size:15px;color:#333}
.card__price{font-weight:800;color:var(--k)!important;font-size:18px!important;margin:0}
.brands{margin-top:40px;padding-top:26px;border-top:1px solid var(--l);display:flex;align-items:center;gap:20px 40px;flex-wrap:wrap}
.brands__t{margin:0;font-size:14px;color:var(--m);max-width:260px}
.brands ul{list-style:none;padding:0;margin:0;display:flex;flex-wrap:wrap;gap:12px}
.brands li{background:var(--bg);border-radius:6px;padding:10px 16px;font-size:14px;color:var(--m)}
.brands li b{color:var(--k);margin-right:10px}

/* водяний знак STELIO, як на сайті */
.wm{overflow:hidden}
.wm::before{content:"STELIO";position:absolute;right:-60px;top:50%;transform:translateY(-50%) rotate(-28deg);font:900 300px/1 var(--f);color:rgba(0,0,0,.035);pointer-events:none;letter-spacing:-.02em}
.wm>.wrap{position:relative}

/* примикання */
.edge{padding:90px 0}
.edge__in{display:grid;grid-template-columns:.9fr 1.1fr;gap:60px;align-items:start}
.edge h2{margin-bottom:18px}
.edge__txt>p{font-size:16.5px}
.ptable{width:100%;border-collapse:collapse;margin-top:26px;font-size:15.5px;background:#fff;border-radius:6px;overflow:hidden}
.ptable th{text-align:left;font-weight:700;font-size:13px;color:var(--m);padding:14px 18px;border-bottom:1px solid var(--l)}
.ptable td{padding:13px 18px;border-bottom:1px solid #f0f0f0}
.ptable tr:last-child td{border-bottom:0}
.ptable th:last-child,.ptable td:last-child{text-align:right;font-weight:700;white-space:nowrap}
.edge__pics{display:grid;grid-template-columns:1fr 1fr;gap:20px}
.edge__pics figure{margin:0}
.edge__pics img{width:100%;aspect-ratio:3/4;object-fit:cover;border-radius:6px}
.edge__pics figcaption{font-size:14.5px;color:#333;padding-top:14px}
.edge__pics b{display:block;font-size:17px;color:var(--k);margin-bottom:4px}

/* замір */
.measure{background:var(--bg2);padding:90px 0}
.measure__in{display:grid;grid-template-columns:1fr 1fr;gap:70px;align-items:center}
.measure h2{margin-bottom:16px}
.checks{list-style:none;padding:0;margin:26px 0 0;display:grid;gap:14px}
.checks li{display:flex;gap:12px;font-weight:700;font-size:15.5px;color:var(--k)}
.checks svg{width:24px;height:24px;fill:var(--k);color:#fff;stroke:#fff}
.formbox{position:relative;background:#fff;border-radius:8px;padding:34px;box-shadow:0 20px 60px rgba(0,0,0,.08)}
.formbox__img{width:100%;aspect-ratio:16/7;object-fit:cover;border-radius:6px;margin-top:26px}
.fld{display:block;margin-bottom:16px}
.fld>span:first-child{display:block;font-size:13px;color:var(--m);margin-bottom:6px}
.fld input{width:100%;font:400 16px var(--f);color:var(--k);padding:13px 14px;border:1px solid var(--l);border-radius:6px;background:#fff}
.fld input:focus{outline:0;border-color:var(--k)}
.fld input.err{border-color:#d32f2f}
.fld__tel{display:flex;gap:8px}
.fld__tel em{font-style:normal;font-size:14px;font-weight:700;padding:13px 12px;border:1px solid var(--l);border-radius:6px;background:var(--bg);white-space:nowrap}
.lead .btn{width:100%;margin-top:6px}
.done{border:1px solid var(--k);border-radius:6px;padding:24px}
.done__h{font-weight:800;font-size:20px;color:var(--k);line-height:1.35}
.done__h a{white-space:nowrap}
.done p:not(.done__h){font-size:15px;color:#333}
.done__msg{display:flex;flex-wrap:wrap;gap:10px}
.done__msg a{display:inline-flex;align-items:center;gap:8px;border:1px solid var(--k);border-radius:6px;padding:10px 16px;text-decoration:none;font-weight:700;font-size:14.5px}
.done__msg a:hover{background:var(--k);color:#fff}

/* освітлення */
.light{padding:90px 0;background:var(--w)}
.lgrid{display:grid;grid-template-columns:repeat(3,1fr);gap:34px 24px}
.lgrid img{width:100%;aspect-ratio:4/3;object-fit:cover;border-radius:6px;margin-bottom:16px}
.lgrid h3{margin-bottom:6px}
.lgrid p{font-size:15px;color:#333;margin:0}

/* ціни */
.price{padding:90px 0}
.price__row{display:grid;grid-template-columns:420px 1fr;gap:40px;align-items:start}
.calc{background:#fff;border-radius:8px;padding:30px;box-shadow:0 20px 60px rgba(0,0,0,.07);position:sticky;top:100px}
.calc h3{font-size:22px;margin-bottom:22px}
.calc__l{display:flex;justify-content:space-between;align-items:baseline;font-size:14px;font-weight:700;color:var(--k);margin-bottom:10px}
.calc__l output{font-size:22px;font-weight:800}
.calc__hint{font-weight:400;color:var(--m)}
.calc input[type=range]{width:100%;accent-color:var(--k);margin:0 0 22px}
.calc fieldset{border:0;padding:0;margin:0 0 20px}
.opt{display:block;cursor:pointer;margin-bottom:8px}
.opt input{position:absolute;opacity:0}
.opt span{display:flex;justify-content:space-between;gap:10px;align-items:center;padding:12px 14px;border:1px solid var(--l);border-radius:6px;font-size:14.5px}
.opt em{font-style:normal;color:var(--m);font-size:13px;white-space:nowrap}
.opt input:checked+span{border-color:var(--k);box-shadow:inset 0 0 0 1px var(--k)}
.opt input:focus-visible+span{outline:2px solid var(--k);outline-offset:2px}
.step{display:flex;align-items:center;width:150px;border:1px solid var(--l);border-radius:6px;margin-bottom:22px}
.step button{width:44px;height:44px;border:0;background:none;font-size:20px;cursor:pointer}
.step input{width:60px;border:0;text-align:center;font:700 17px var(--f);-moz-appearance:textfield}
.step input::-webkit-inner-spin-button{-webkit-appearance:none}
.calc__res{background:var(--bg);border-radius:6px;padding:16px 18px;margin-bottom:14px}
.calc__res p{margin:0;font-size:14px;color:var(--m)}
.calc__res .calc__sum{font-size:32px;font-weight:800;color:var(--k);line-height:1.2}
.calc__res .calc__min{font-size:13px;margin-top:6px;color:#333}
.calc__fake{font-size:13px;color:var(--m);margin-bottom:18px}
.calc__fake b{color:var(--k);text-decoration:line-through}
.calc .btn{width:100%}
.ptbl h3{font-size:22px;margin-bottom:18px}
.ptbl table{width:100%;border-collapse:collapse;background:#fff;border-radius:8px;overflow:hidden;font-size:15px}
.ptbl th{text-align:left;font-size:13px;color:var(--m);font-weight:700;padding:14px 18px;background:#fff;border-bottom:1px solid var(--l)}
.ptbl td{padding:15px 18px;border-bottom:1px solid #f0f0f0;vertical-align:top}
.ptbl td:nth-child(2),.ptbl th:nth-child(2){white-space:nowrap}
.ptbl td:last-child,.ptbl th:last-child{text-align:right;white-space:nowrap}
.ptbl td:last-child{font-weight:800;color:var(--k)}
.ptbl tr:last-child td{border-bottom:0}
.incl{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin-top:20px}
.incl>div{background:#fff;border-radius:8px;padding:22px}
.incl h4{font-size:16px;margin-bottom:8px}
.incl p{font-size:14.5px;color:#333;margin:0}

/* розстрочка: чорна смуга, як у референсу */
.pay{background:var(--k);color:#fff;overflow:hidden;padding:30px 0}
.pay__wm{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;font:800 150px/1 var(--f);color:rgba(255,255,255,.07);white-space:nowrap;pointer-events:none}
.pay__in{position:relative;display:flex;align-items:center;gap:30px 40px;flex-wrap:wrap}
.banks{display:flex;gap:10px}
.banks span{display:flex;align-items:center;justify-content:center;height:56px;padding:0 16px;border-radius:10px;background:#fff;color:var(--k);font-weight:800;font-size:15px}
.pay__txt{flex:1 1 380px}
.pay__h{font-weight:800;font-size:19px;margin:0 0 4px}
.pay__txt p:last-child{margin:0;font-size:14.5px;color:#cfcfcf}

/* чому */
.why{padding:90px 0}
.why__head{display:flex;justify-content:space-between;align-items:flex-end;gap:20px 40px;flex-wrap:wrap;margin-bottom:40px}
.why__head h2{max-width:460px}
.why__nums{display:flex;flex-wrap:wrap;gap:8px 28px;margin:0;font-size:14px;color:var(--m)}
.why__nums b{font-size:24px;color:var(--k);font-weight:800;margin-right:4px}
.why__in{display:grid;grid-template-columns:1.3fr .7fr;gap:50px;align-items:start}
.why__list{list-style:none;padding:0;margin:0;display:grid;grid-template-columns:1fr 1fr;gap:30px 34px}
.why__list li{display:flex;gap:14px}
.why__list svg{width:30px;height:30px;color:var(--k);stroke-width:1.5}
.why__list h3{font-size:17px;margin-bottom:6px}
.why__list p{font-size:14.5px;color:#333;margin:0}
.why__img{margin:0}
.why__img img{width:100%;aspect-ratio:4/5;object-fit:cover;border-radius:6px}
.flood{display:grid;grid-template-columns:320px 1fr;gap:34px;align-items:center;margin-top:50px;background:#fff;border-radius:8px;padding:20px}
.flood img{width:100%;aspect-ratio:4/3;object-fit:cover;border-radius:6px}
.flood__h{display:flex;align-items:center;gap:10px;font-weight:800;font-size:22px;color:var(--k);margin-bottom:10px}
.flood__h svg{width:26px;height:26px}
.flood p:last-child{margin:0;font-size:16px;max-width:640px}

/* faq: тонкий плюс, що стає хрестиком */
.faq{padding:90px 0;background:var(--w)}
.faq__in{max-width:900px}
.faq h2{text-align:center;margin-bottom:34px}
.faq details{border-bottom:1px solid var(--l)}
.faq details[open]{background:linear-gradient(180deg,var(--bg),#fff)}
.faq summary{list-style:none;cursor:pointer;display:flex;justify-content:space-between;align-items:center;gap:24px;padding:22px 20px;font-weight:700;font-size:16.5px;color:var(--k)}
.faq summary::-webkit-details-marker{display:none}
.faq summary i{position:relative;width:18px;height:18px;flex:none;transition:transform .25s}
.faq summary i::before,.faq summary i::after{content:"";position:absolute;left:0;top:8.5px;width:18px;height:1.5px;background:var(--k)}
.faq summary i::after{transform:rotate(90deg)}
.faq details[open] summary i{transform:rotate(45deg)}
.faq details p{padding:0 60px 22px 20px;margin:0;font-size:15.5px;color:#333}

/* контакти */
.contact{padding:90px 0}
.contact__in{display:grid;grid-template-columns:1.2fr .8fr;gap:60px;align-items:start}
.contact h2{margin-bottom:14px}
.addr{list-style:none;padding:0;margin:26px 0 30px;display:grid;grid-template-columns:1fr 1fr;gap:20px 30px}
.addr li{display:flex;gap:12px;font-size:15px;color:#333}
.addr b{display:block;color:var(--k)}
.contact__info img{width:100%;aspect-ratio:16/8;object-fit:cover;border-radius:6px}
.formbox--side{position:sticky;top:100px}
.formbox__h{font-weight:800;font-size:24px;color:var(--k);margin-bottom:6px}
.formbox__p{font-size:15px;color:#333;margin-bottom:22px}
.formbox__alt{font-size:14px;color:var(--m);margin:16px 0 0;text-align:center}
.formbox__alt a{font-weight:800;color:var(--k);text-decoration:none}

/* підвал як у референсу */
.ftr{background:var(--k3);color:#cfcfcf;font-size:14px}
.ftr__cta{background:#444}
.ftr__ctaIn{display:flex;align-items:center;gap:26px 40px;flex-wrap:wrap;min-height:84px;padding-top:14px;padding-bottom:14px}
.ftr__slog{max-width:200px;color:#fff;font-size:14px;line-height:1.35}
.ftr__tel{font-weight:800;color:#fff;text-decoration:none;font-size:17px;margin-left:auto}
.ftr__in{display:grid;grid-template-columns:repeat(4,1fr);gap:30px;padding-top:44px;padding-bottom:44px}
.ftr__in h4{color:#fff;font-size:14px;margin-bottom:14px}
.ftr__in a{display:block;text-decoration:none;color:#9d9d9d;margin-bottom:7px}
.ftr__in a:hover{color:#fff}
.ftr__in p{color:#9d9d9d;margin-bottom:7px}
.ftr__bot{background:#151515;font-size:13px}
.ftr__botIn{display:flex;justify-content:space-between;gap:12px;padding-top:14px;padding-bottom:14px;color:#cfcfcf}
.ftr__bot a{color:#8d8d8d;text-decoration:none}
.ftr__bot a:hover{color:#fff}

/* бокові кнопки зв'язку, як на сайті */
.side{position:fixed;right:18px;top:50%;transform:translateY(-50%);z-index:60;display:flex;flex-direction:column;gap:10px;align-items:flex-end}
.side__b{width:46px;height:46px;border-radius:50%;display:flex;align-items:center;justify-content:center;color:#fff;box-shadow:0 6px 18px rgba(0,0,0,.18);position:relative;text-decoration:none}
.side__b--v{background:#7360f2}.side__b--t{background:#2aa1da}
.side__b--p{background:var(--k);width:56px;height:56px;border-radius:14px}
.side__pill{position:absolute;right:66px;top:50%;transform:translateY(-50%);background:var(--k);color:#fff;font-size:12.5px;line-height:1.3;font-weight:700;padding:10px 14px;border-radius:12px;white-space:nowrap}

.rv{opacity:0;transform:translateY(16px);transition:opacity .55s,transform .55s}
.rv.in{opacity:1;transform:none}

@media (max-width:1180px){
  .nav{gap:22px}
  .price__row{grid-template-columns:380px 1fr}
  .side__pill{display:none}
}
@media (max-width:980px){
  .wrap{padding:0 24px}
  .nav{position:fixed;inset:106px 0 auto;flex-direction:column;gap:0;background:var(--bg);padding:6px 24px 22px;display:none;font-size:18px;box-shadow:0 20px 30px rgba(0,0,0,.08)}
  .nav.is-open{display:flex}
  .nav a{padding:13px 0;border-bottom:1px solid var(--l)}
  .hdr__calc{display:none}
  .hdr__tel{display:flex;margin-left:auto;width:44px;height:44px;align-items:center;justify-content:center;border:1px solid var(--k);border-radius:6px}
  .burger{display:flex;flex-direction:column;justify-content:center;gap:7px;width:44px;height:44px;background:none;border:0;padding:10px;cursor:pointer}
  .burger span{height:2px;background:var(--k);transition:transform .2s}
  .burger[aria-expanded=true] span:first-child{transform:translateY(4.5px) rotate(45deg)}
  .burger[aria-expanded=true] span:last-child{transform:translateY(-4.5px) rotate(-45deg)}
  .hero__row,.sec-head,.edge__in,.measure__in,.why__in,.contact__in,.price__row{grid-template-columns:1fr;gap:30px}
  .hero__trust{grid-template-columns:1fr 1fr}
  .cards3,.lgrid{grid-template-columns:1fr 1fr}
  .calc,.formbox--side{position:static}
  .why__img{display:none}
  .addr{grid-template-columns:1fr}
}
@media (max-width:640px){
  body{font-size:15.5px}
  .wrap{padding:0 16px}
  .topbar__mid{display:none}
  .hdr__in{height:62px;gap:12px}
  .logo img{width:84px}
  .nav{inset:96px 0 auto}
  html{scroll-padding-top:70px}
  .hero{padding:26px 0 50px}
  .hero h1{font-size:44px}
  .hero__price{margin-top:22px}
  .hero__side p{font-size:16px}
  .hero__btns .btn{width:100%}
  .hero__img{margin-top:28px}
  .hero__img img{aspect-ratio:4/3}
  .hero__trust{grid-template-columns:1fr;gap:16px}
  .canv,.edge,.measure,.light,.price,.why,.faq,.contact{padding:60px 0}
  .cards3,.lgrid{grid-template-columns:1fr}
  .lgrid{gap:28px}
  .brands{gap:14px}
  .edge__pics{grid-template-columns:1fr 1fr;gap:12px}
  .edge__pics img{aspect-ratio:3/4}
  .ptable th,.ptable td{padding:12px 12px}
  .formbox{padding:22px 18px}
  .calc{padding:22px 18px}
  .ptbl table{font-size:14px}
  .ptbl th,.ptbl td{padding:12px 10px}
  .ptbl td:nth-child(2),.ptbl th:nth-child(2){padding-left:0;padding-right:0}
  .incl{grid-template-columns:1fr}
  .pay__wm{font-size:90px}
  .banks span{height:46px;padding:0 12px;font-size:13.5px}
  .pay .btn{width:100%}
  .why__list{grid-template-columns:1fr;gap:24px}
  .flood{grid-template-columns:1fr;gap:18px;padding:14px}
  .faq summary{padding:18px 4px;font-size:15.5px}
  .faq details p{padding:0 4px 18px}
  .wm::before{font-size:160px}
  .ftr__tel{margin-left:0}
  .ftr__in{grid-template-columns:1fr 1fr}
  .ftr__botIn{flex-direction:column;padding-bottom:84px}
  .side{top:auto;bottom:16px;transform:none;right:12px;flex-direction:row;align-items:center}
  .side__b{width:46px;height:46px}
  .side__b--p{width:50px;height:50px}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *{transition:none!important;animation:none!important}
  .rv{opacity:1;transform:none}
}
.lead__proof{display:flex;align-items:center;flex-wrap:wrap;gap:8px;justify-content:center;font-size:13px;color:var(--m);margin:14px 0 0}
.lead__proof .stars svg{width:14px;height:14px}
.pay{padding:40px 0}
.pay__h{font-size:20px}
.pay__txt{flex:1 1 420px}
@media (max-width:640px){
  .cards3{display:flex;overflow-x:auto;scroll-snap-type:x mandatory;gap:14px;margin:0 -16px;padding:0 16px 8px;scrollbar-width:none}
  .cards3::-webkit-scrollbar{display:none}
  .cards3 .card{flex:0 0 82%;scroll-snap-align:start}
  .lgrid{grid-template-columns:1fr 1fr;gap:22px 12px}
  .lgrid img{margin-bottom:10px}
  .lgrid h3{font-size:15px}
  .lgrid p{font-size:13px}
  .side{flex-direction:column;align-items:flex-end;gap:8px;bottom:14px;right:10px}
  .side__b{width:42px;height:42px}
  .side__b svg{width:20px;height:20px}
  .side__b--p{width:48px;height:48px}
  .pay__h{font-size:18px}
}