/* Газкомм v5 — «Синее пламя».
   Night-ink hero with a live gas-burner flame; cool paper body; brand blue for action.
   Display: Oswald 300 (condensed, industrial). Text: Golos Text 400/500. */
:root{
  --ink:#0A1222;
  --ink-2:#111C31;
  --paper:#F3F6F9;
  --white:#FFFFFF;
  --blue:#0797D5;
  --blue-deep:#00477D;
  --flame:#7FD8FF;
  --text:#0E1726;
  --t80:rgb(14 23 38 / .78);
  --t60:rgb(14 23 38 / .6);
  --line:rgb(14 23 38 / .1);
  --w80:rgb(255 255 255 / .8);
  --w60:rgb(255 255 255 / .6);
  --wline:rgb(255 255 255 / .14);
  --f-d:"Oswald","Arial Narrow",Impact,sans-serif;
  --f:"Golos Text",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  --ease:cubic-bezier(.22,1,.36,1);
  --side:clamp(16px,4vw,64px);
  --max:1360px;
  color-scheme:light;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:72px;background:var(--white)}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
body{margin:0;background:var(--white);color:var(--text);font:400 16px/1.6 var(--f);-webkit-font-smoothing:antialiased;overflow-x:hidden}
img{max-width:100%;display:block}
a{color:inherit}
p{margin:0;text-wrap:pretty}
h1,h2,h3{margin:0;font-weight:300;text-wrap:balance;hyphens:none}
[hidden]{display:none!important}
:focus-visible{outline:2px solid var(--blue);outline-offset:3px}
.wrap{max-width:var(--max);margin:0 auto;padding-left:max(var(--side),env(safe-area-inset-left,0px));padding-right:max(var(--side),env(safe-area-inset-right,0px))}
.ico{width:22px;height:22px;flex:none;stroke:currentColor;fill:none;stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round}
.sprite{position:absolute;width:0;height:0}

/* type */
.d1{font-family:var(--f-d);font-weight:300;font-size:clamp(3.2rem,9.4vw,9.6rem);line-height:.9;letter-spacing:-.01em}
.d2{font-family:var(--f-d);font-weight:300;font-size:clamp(2.6rem,6vw,5.8rem);line-height:.92;letter-spacing:-.005em}
.d3{font-family:var(--f-d);font-weight:300;font-size:clamp(1.9rem,3.4vw,3rem);line-height:1;letter-spacing:0}
.lede{font-size:clamp(16px,1.2vw,19px);line-height:1.6;color:var(--t80);max-width:48ch}
.kicker{font-size:14px;color:var(--blue);font-weight:500}

/* buttons */
.btn{position:relative;overflow:hidden;isolation:isolate;display:inline-flex;align-items:center;justify-content:center;gap:12px;min-height:56px;padding:0 28px;border-radius:999px;border:0;font:500 16px/1 var(--f);text-decoration:none;cursor:pointer;transition:transform 620ms var(--ease)}
.btn .ico{width:18px;height:18px;transition:transform 520ms var(--ease)}
.btn::before{content:"";position:absolute;inset:0;z-index:-1;transform:scaleX(0);transform-origin:left;transition:transform 500ms var(--ease)}
.btn span{transition:color 320ms var(--ease)}
.btn:hover::before{transform:scaleX(1)}
.btn:hover .ico{transform:translateX(4px)}
.btn--blue{background:var(--blue);color:var(--white)}
.btn--blue::before{background:var(--blue-deep)}
.btn--light{background:var(--white);color:var(--ink)}
.btn--light::before{background:var(--flame)}
.btn--ghost{background:transparent;color:inherit;box-shadow:inset 0 0 0 1px currentColor}
.btn--ghost::before{background:rgb(127 216 255 / .14)}
.assure{font-size:13px;color:var(--t60)}

/* header */
.hdr{position:fixed;inset:0 0 auto;z-index:50;transition:background 420ms var(--ease),box-shadow 420ms var(--ease),color 420ms var(--ease);color:var(--white);padding-top:env(safe-area-inset-top,0px)}
.hdr.is-light{background:rgb(255 255 255 / .96);color:var(--text);box-shadow:0 1px 0 var(--line)}
.hdr .wrap{display:flex;align-items:center;gap:28px;height:72px}
.logo{display:flex;color:inherit;flex:none}
.logo svg{height:30px;width:auto}
.nav{display:flex;gap:26px;margin-left:auto}
.nav a{text-decoration:none;font-size:14px;opacity:.72;transition:opacity 320ms var(--ease)}
.nav a:hover{opacity:1}
.tel{font-size:14px;font-weight:500;text-decoration:none;white-space:nowrap}
.hdr .btn{min-height:44px;padding:0 20px;font-size:14px}
.burger{display:none;margin-left:auto;width:44px;height:44px;border-radius:999px;border:0;background:rgb(127 127 127 / .16);color:inherit;cursor:pointer;place-items:center}
.mnav{position:fixed;inset:0;z-index:60;background:var(--ink);color:var(--white);display:flex;flex-direction:column;padding:calc(env(safe-area-inset-top,0px) + 16px) max(var(--side),env(safe-area-inset-right,0px)) 32px max(var(--side),env(safe-area-inset-left,0px))}
.mnav-top{display:flex;justify-content:space-between;align-items:center;height:56px}
.mnav-top button{width:44px;height:44px;border-radius:999px;border:0;background:rgb(255 255 255 / .1);color:var(--white);display:grid;place-items:center;cursor:pointer}
.mnav nav{display:grid;margin-top:24px}
.mnav nav a{font-family:var(--f-d);font-weight:300;font-size:40px;line-height:1.25;text-decoration:none;padding:6px 0}
.mnav .btn{margin-top:auto}
.mnav .tel{margin-top:20px;font-size:18px;text-align:center}
@media (max-width:1080px){.nav{display:none}.tel{margin-left:auto}}
@media (max-width:640px){.hdr .tel,.hdr .btn{display:none}.burger{display:grid}}

/* HERO — night + flame */
.hero{position:relative;background:var(--ink);color:var(--white);min-height:100svh;display:flex;overflow:hidden}
.flame{position:absolute;inset:0;width:100%;height:100%;display:block}
.hero::after{content:"";position:absolute;inset:auto 0 0;height:40%;background:linear-gradient(to top,var(--ink),transparent);pointer-events:none}
.hero .wrap{position:relative;z-index:2;width:100%;display:grid;grid-template-rows:1fr auto;padding-block:calc(72px + 4vh) clamp(28px,5vh,56px)}
.hero-main{align-self:end;display:grid;gap:28px;max-width:860px}
.hero h1 span{display:block}
.hero h1 .soft{color:var(--flame)}
.hero .lede{color:var(--w80);max-width:44ch}
.hero .assure{color:var(--w60)}
.cta-row{display:flex;flex-wrap:wrap;align-items:center;gap:14px 20px}
.hero-stats{display:grid;grid-template-columns:repeat(4,auto);justify-content:space-between;gap:20px 32px;margin-top:clamp(40px,7vh,80px);padding-top:24px;box-shadow:0 -1px 0 var(--wline)}
.hero-stats div{display:grid;gap:4px}
.hero-stats b{font-family:var(--f-d);font-weight:300;font-size:clamp(28px,3.2vw,44px);line-height:1;font-variant-numeric:tabular-nums}
.hero-stats span{font-size:13px;color:var(--w60)}
.hint{position:absolute;right:max(var(--side),env(safe-area-inset-right,0px));top:calc(72px + 3vh);z-index:2;font-size:13px;color:var(--w60);display:flex;gap:8px;align-items:center}
@media (max-width:760px){.hero-stats{grid-template-columns:1fr 1fr;justify-content:stretch}.hint{display:none}.hero-main{gap:22px}}

.rise{animation:rise 1000ms var(--ease) both;animation-delay:var(--d,0ms)}
@keyframes rise{from{opacity:0;transform:translateY(24px);filter:blur(10px)}to{opacity:1;transform:none;filter:none}}
@media (max-width:760px){@keyframes rise{from{opacity:0;transform:translateY(18px)}to{opacity:1;transform:none}}}
@media (prefers-reduced-motion:reduce){.rise{animation:none}}
.r1{--d:200ms}.r2{--d:360ms}.r3{--d:560ms}.r4{--d:720ms}.r5{--d:900ms}

/* sections */
.sec{padding-block:clamp(88px,11vw,170px)}
.sec--paper{background:var(--paper)}
.sec--ink{background:var(--ink);color:var(--white)}
.sec--ink .lede{color:var(--w80)}
.head{display:grid;grid-template-columns:7fr 5fr;gap:24px 64px;align-items:end;margin-bottom:clamp(44px,5.5vw,84px)}
.head .kicker{grid-column:1 / -1;margin-bottom:-8px}
@media (max-width:900px){.head{grid-template-columns:1fr}}

/* PAIN */
.pains{display:grid;grid-template-columns:repeat(3,1fr);gap:clamp(16px,2vw,28px)}
.pain{display:grid;gap:16px;align-content:start;padding-top:28px;box-shadow:0 -2px 0 var(--text)}
.pain .n{font-family:var(--f-d);font-weight:300;font-size:56px;line-height:1;color:var(--blue)}
.pain h3{font-size:22px;font-weight:500;letter-spacing:-.01em;line-height:1.2}
.pain p{color:var(--t80);font-size:16px}
.answer{margin-top:clamp(48px,6vw,88px);display:flex;flex-wrap:wrap;justify-content:space-between;align-items:center;gap:24px;padding:clamp(28px,3.4vw,48px);background:var(--ink);color:var(--white)}
.answer p{font-family:var(--f-d);font-weight:300;font-size:clamp(26px,3vw,40px);line-height:1.1;max-width:22ch}
.answer p em{font-style:normal;color:var(--flame)}
@media (max-width:860px){.pains{grid-template-columns:1fr;gap:36px}}

/* YOUR PART / OUR PART */
.split{display:grid;grid-template-columns:4fr 8fr;gap:clamp(20px,2.4vw,32px)}
.part{padding:clamp(28px,3vw,44px);display:grid;gap:22px;align-content:start}
.part--you{background:var(--white);box-shadow:inset 0 0 0 1px var(--line)}
.part--us{background:var(--blue-deep);color:var(--white)}
.part-h{display:flex;justify-content:space-between;align-items:baseline;gap:12px}
.part-h h3{font-family:var(--f-d);font-weight:300;font-size:clamp(30px,3vw,44px);line-height:1}
.part-h span{font-size:13px;opacity:.7;white-space:nowrap}
.part ol{list-style:none;margin:0;padding:0;counter-reset:s}
.part li{counter-increment:s;display:grid;grid-template-columns:40px 1fr;gap:12px;padding:16px 0;align-items:baseline}
.part--you li{box-shadow:0 1px 0 var(--line)}
.part--us li{box-shadow:0 1px 0 var(--wline)}
.part li:last-child{box-shadow:none}
.part li::before{content:counter(s,decimal-leading-zero);font-size:13px;opacity:.6;font-variant-numeric:tabular-nums}
.part li b{font-weight:500;display:block;font-size:17px}
.part li span{font-size:14px;opacity:.72}
.part--us ol{display:grid;grid-template-columns:1fr 1fr;column-gap:32px}
.part--us li:nth-last-child(2){box-shadow:none}
@media (max-width:900px){.split{grid-template-columns:1fr}}
@media (max-width:560px){.part--us ol{grid-template-columns:1fr}.part--us li:nth-last-child(2){box-shadow:0 1px 0 var(--wline)}}

/* BOILER PICKER */
.picker{display:grid;grid-template-columns:5fr 7fr;gap:clamp(24px,4vw,72px);align-items:center}
.calc{display:grid;gap:28px}
.area-out{display:flex;align-items:baseline;gap:12px}
.area-out b{font-family:var(--f-d);font-weight:300;font-size:clamp(64px,8vw,112px);line-height:.85;font-variant-numeric:tabular-nums;color:var(--text)}
.area-out span{font-size:18px;color:var(--t60)}
.range{display:grid;gap:10px}
.range label{font-size:14px;color:var(--t60)}
.range input{width:100%;accent-color:var(--blue);height:32px}
.range .ticks{display:flex;justify-content:space-between;font-size:12px;color:var(--t60);font-variant-numeric:tabular-nums}
.models{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}
.model{padding:16px 14px;background:var(--white);box-shadow:inset 0 0 0 1px var(--line);display:grid;gap:4px;transition:background 420ms var(--ease),color 420ms var(--ease),box-shadow 420ms var(--ease);cursor:pointer;border:0;font:inherit;text-align:left;color:inherit}
.model b{font-family:var(--f-d);font-weight:300;font-size:30px;line-height:1}
.model span{font-size:13px;opacity:.7}
.model em{font-style:normal;font-size:15px;font-weight:500;margin-top:6px}
.model.is-on{background:var(--blue);color:var(--white);box-shadow:none}
.calc-note{font-size:13px;color:var(--t60);max-width:46ch}
.calc .cta-row{margin-top:4px}
.stage{position:relative;aspect-ratio:1/1;max-height:640px;width:100%;background:radial-gradient(50% 50% at 50% 46%,var(--white),var(--paper) 74%)}
.stage canvas{position:absolute;inset:0;width:100%;height:100%;display:block;cursor:grab;touch-action:pan-y}
.stage .poster{position:absolute;left:50%;top:50%;height:74%;width:auto;transform:translate(-50%,-52%);transition:opacity 700ms var(--ease)}
.stage.is-ready .poster{opacity:0}
.stage .floor{position:absolute;left:32%;right:32%;bottom:9%;height:28px;background:radial-gradient(closest-side,rgb(14 23 38 / .32),transparent);filter:blur(8px)}
.stage-ui{position:absolute;left:0;right:0;bottom:16px;display:flex;justify-content:center;gap:8px;z-index:2}
.seg{display:inline-flex;padding:4px;border-radius:999px;background:var(--white);box-shadow:0 10px 30px -12px rgb(14 23 38 / .35)}
.seg button{min-height:40px;padding:0 18px;border-radius:999px;border:0;background:transparent;font:500 14px var(--f);color:var(--t80);cursor:pointer;transition:background 320ms var(--ease),color 320ms var(--ease)}
.seg button[aria-pressed="true"]{background:var(--ink);color:var(--white)}
@media (max-width:900px){.picker{grid-template-columns:minmax(0,1fr)}.stage{order:-1;aspect-ratio:auto;height:min(92vw,420px);max-height:none;width:100%}}

.gen{margin-top:clamp(48px,6vw,88px);display:grid;grid-template-columns:auto 1fr auto;gap:24px 40px;align-items:center;padding:clamp(24px,3vw,40px);background:var(--white);box-shadow:inset 0 0 0 1px var(--line)}
.gen img{width:clamp(120px,14vw,180px)}
.gen h3{font-family:var(--f-d);font-weight:300;font-size:clamp(26px,2.6vw,36px);line-height:1}
.gen p{color:var(--t80);margin-top:8px;max-width:46ch}
.gen .price{font-size:15px;color:var(--t60);margin-top:12px}
.gen .price b{color:var(--text);font-weight:500}
@media (max-width:760px){.gen{grid-template-columns:1fr;text-align:left}.gen img{width:150px}}

/* WHO */
.who{display:grid;grid-template-columns:repeat(4,1fr);gap:2px;background:var(--line)}
.who a{background:var(--white);padding:clamp(24px,2.6vw,36px);display:grid;gap:12px;align-content:start;text-decoration:none;min-height:230px;position:relative;isolation:isolate;overflow:hidden}
.who a::before{content:"";position:absolute;inset:0;background:var(--paper);transform:scaleY(0);transform-origin:bottom;transition:transform 620ms var(--ease);z-index:-1}
.who a:hover::before{transform:scaleY(1)}
.who .ico{width:30px;height:30px;color:var(--blue);stroke-width:1.4}
.who h3{font-family:var(--f-d);font-weight:300;font-size:30px;line-height:1;margin-top:auto}
.who p{font-size:15px;color:var(--t60)}
@media (max-width:1000px){.who{grid-template-columns:1fr 1fr}}
@media (max-width:520px){.who{grid-template-columns:1fr}.who a{min-height:0;grid-template-columns:30px 1fr;column-gap:16px}.who a .ico{grid-row:span 2}.who h3{margin:0;font-size:26px}}

/* PROJECTS */
.proj{display:grid;grid-template-columns:repeat(4,1fr);gap:2px}
.pc{position:relative;margin:0;aspect-ratio:3/4;overflow:hidden;background:var(--ink)}
.pc img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;transform:scale(1.04);transition:transform 900ms var(--ease)}
.pc:hover img{transform:scale(1.1)}
.pc figcaption{position:absolute;inset:auto 0 0;padding:64px 20px 20px;color:var(--white);background:linear-gradient(to top,rgb(10 18 34 / .72),transparent);display:grid;gap:4px}
.pc figcaption span{font-size:13px;opacity:.8}
.pc figcaption b{font-family:var(--f-d);font-weight:300;font-size:30px;line-height:1}
@media (max-width:1000px){.proj{grid-template-columns:1fr 1fr}}

.rev-head{display:flex;justify-content:space-between;align-items:baseline;gap:16px;margin:clamp(56px,6vw,88px) 0 24px}
.rev-head h3{font-family:var(--f-d);font-weight:300;font-size:clamp(28px,2.8vw,40px);line-height:1}
.rev-head p{font-size:14px;color:var(--t60)}
.rev{display:grid;grid-template-columns:repeat(6,1fr);gap:12px}
.vr{margin:0;position:relative;aspect-ratio:9/16;background:var(--ink-2);overflow:hidden;cursor:pointer}
.vr video{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.vr button{position:absolute;left:50%;top:50%;width:64px;height:64px;margin:-32px 0 0 -32px;border-radius:50%;border:0;background:var(--blue);display:grid;place-items:center;cursor:pointer;transition:transform 520ms var(--ease)}
.vr button .ico{width:20px;height:20px;fill:var(--white);stroke:none;margin-left:3px}
.vr:hover button{transform:scale(1.08)}
.vr figcaption{position:absolute;left:14px;bottom:12px;font-size:13px;color:var(--white);text-shadow:0 1px 8px rgb(0 0 0 / .5)}
.vr.is-playing button,.vr.is-playing figcaption{display:none}
@media (max-width:1000px){.rev{grid-template-columns:repeat(3,1fr)}}
@media (max-width:640px){.rev{grid-template-columns:none;grid-auto-flow:column;grid-auto-columns:46%;overflow-x:auto;scroll-snap-type:x mandatory;margin-inline:calc(-1 * max(var(--side),env(safe-area-inset-left,0px)));padding-inline:max(var(--side),env(safe-area-inset-left,0px));scrollbar-width:none}.rev::-webkit-scrollbar{display:none}.vr{scroll-snap-align:start}}

/* TRUST strip */
.trust{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.trust div{display:grid;gap:10px;align-content:start}
.trust .ico{width:28px;height:28px;color:var(--flame);stroke-width:1.4}
.trust b{font-weight:500;font-size:17px}
.trust span{font-size:14px;color:var(--w60)}
@media (max-width:900px){.trust{grid-template-columns:1fr 1fr;gap:32px 20px}}

/* FAQ */
.faq{display:grid;grid-template-columns:5fr 7fr;gap:32px 64px}
.faq .lede{margin-top:20px}
.qa{box-shadow:0 -1px 0 var(--line)}
.qa details{box-shadow:0 1px 0 var(--line)}
.qa summary{list-style:none;cursor:pointer;display:flex;align-items:center;gap:20px;padding:24px 0;font-size:clamp(17px,1.4vw,20px);font-weight:500}
.qa summary::-webkit-details-marker{display:none}
.qa summary span{flex:1}
.qa summary i{flex:none;width:36px;height:36px;border-radius:50%;background:var(--paper);display:grid;place-items:center;transition:transform 520ms var(--ease),background 320ms var(--ease),color 320ms var(--ease)}
.qa summary i .ico{width:16px;height:16px;stroke-width:2}
.qa details[open] summary i{transform:rotate(45deg);background:var(--blue);color:var(--white)}
.qa-a{overflow:hidden}
.qa-a p{padding:0 56px 26px 0;color:var(--t80);max-width:60ch}
@media (max-width:900px){.faq{grid-template-columns:1fr}}

/* FINAL */
.final{position:relative;background:var(--ink);color:var(--white);overflow:hidden}
.final .flame{opacity:.55}
.final .wrap{position:relative;z-index:2;display:grid;grid-template-columns:6fr 5fr;gap:48px 72px;padding-block:clamp(88px,11vw,160px)}
.final .lede{color:var(--w80);margin-top:24px}
.cts{margin:40px 0 0;display:grid;grid-template-columns:1fr 1fr;gap:24px 32px}
.cts dt{font-size:13px;color:var(--w60)}
.cts dd{margin:6px 0 0;font-size:17px;overflow-wrap:anywhere;user-select:all}
.cts dd a{text-decoration:none}
.cts dd.big{font-family:var(--f-d);font-weight:300;font-size:clamp(28px,2.6vw,38px);line-height:1}
.form{background:var(--white);color:var(--text);padding:clamp(24px,3vw,44px);display:grid;gap:20px;align-content:start}
.form h3{font-family:var(--f-d);font-weight:300;font-size:clamp(28px,2.6vw,38px);line-height:1}
.fld{display:grid;gap:8px}
.fld>label,.fld>.lbl{font-size:13px;color:var(--t60)}
.fld input{height:54px;border:0;border-radius:0;background:transparent;box-shadow:inset 0 -1px 0 rgb(14 23 38 / .3);font:400 18px var(--f);color:var(--text);padding:0;transition:box-shadow 320ms var(--ease)}
.fld input:focus{outline:none;box-shadow:inset 0 -2px 0 var(--blue)}
.chips{display:flex;flex-wrap:wrap;gap:8px}
.chips input{position:absolute;opacity:0;pointer-events:none}
.chips label{display:inline-flex;align-items:center;min-height:44px;padding:0 16px;border-radius:999px;background:var(--paper);font-size:14px;cursor:pointer;transition:background 320ms var(--ease),color 320ms var(--ease)}
.chips input:checked+label{background:var(--ink);color:var(--white)}
.chips input:focus-visible+label{outline:2px solid var(--blue);outline-offset:2px}
.err{font-size:13px;color:#C62828}
.ok{background:var(--paper);padding:16px 18px;font-size:14px}
.form small{font-size:12px;color:var(--t60);line-height:1.5}
@media (max-width:900px){.final .wrap{grid-template-columns:1fr}.form{margin-inline:calc(-1 * max(var(--side),env(safe-area-inset-left,0px)))}}
@media (max-width:440px){.cts{grid-template-columns:1fr}}

.map{position:relative;height:clamp(360px,44vw,520px);background:var(--paper)}
.map iframe{width:100%;height:100%;border:0;display:block;filter:grayscale(1) contrast(1.05)}
.map-card{position:absolute;left:max(var(--side),env(safe-area-inset-left,0px));bottom:24px;background:var(--white);padding:22px 24px;display:grid;gap:4px;box-shadow:0 24px 48px -24px rgb(14 23 38 / .4);max-width:min(420px,calc(100% - 32px))}
.map-card span{font-size:13px;color:var(--t60)}
.map-card b{font-family:var(--f-d);font-weight:300;font-size:28px;line-height:1.1}
.map-card div{display:flex;flex-wrap:wrap;gap:8px;margin-top:14px}
.map-card .btn{min-height:44px;padding:0 18px;font-size:14px}

footer{background:var(--ink);color:var(--w60)}
footer .wrap{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:20px 40px;padding-block:32px}
footer .logo{color:var(--white)}
footer .logo svg{height:26px}
footer nav{display:flex;flex-wrap:wrap;gap:22px;font-size:14px}
footer nav a{text-decoration:none}
footer nav a:hover{color:var(--white)}
footer small{font-size:13px}

/* phone: centred hero copy */
@media (max-width:640px){
  .hero-main{text-align:left}
  .cta-row{flex-direction:column;align-items:stretch}
  .cta-row .assure{text-align:center}
  .answer{flex-direction:column;align-items:flex-start}
}