/* balkon-tagil — «тепловизор» */
:root{
  --frost:#F4F7FA; --frost2:#E8F0F6; --ice:#9CC3DD; --ice2:#CFE3F0; --gr:#1E2A36; --gr2:#4D5B69; --mute:#7F8C99;
  --violet:#5B3FD0; --rose:#D4337A; --amber:#F2A541; --heat:linear-gradient(90deg,#5B3FD0,#D4337A 50%,#F2A541);
  --night:#14203A;
  --h:"Jost",system-ui,sans-serif; --t:"Golos Text",system-ui,sans-serif;
  --gut:clamp(16px,3.5vw,48px); --rail:150px;
  --air-top:#DCEBF5; --air-bot:#C7DDED;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--frost);color:var(--gr);font:400 16px/1.55 var(--t);-webkit-font-smoothing:antialiased;overflow-x:hidden}
body::before{content:"";position:fixed;inset:0;pointer-events:none;z-index:0;opacity:.6;
  background:radial-gradient(1200px 500px at 100% 0,rgba(156,195,221,.25),transparent 60%),radial-gradient(900px 600px at 0 100%,rgba(156,195,221,.22),transparent 60%)}
main,header,footer{position:relative;z-index:1}
img{max-width:100%;display:block}
a{color:inherit}
h1,h2,h3{font-family:var(--h);font-weight:600;letter-spacing:-.015em;margin:0;line-height:1.05}
h2{font-size:clamp(32px,4vw,52px)}
button{font:inherit;color:inherit}

/* ---------- термометр-навигация ---------- */
.tb-thermo{position:fixed;left:12px;top:16px;bottom:16px;width:128px;z-index:20;padding:10px 8px;border-radius:16px;background:rgba(244,247,250,.82);backdrop-filter:blur(10px);box-shadow:0 8px 30px rgba(30,42,54,.08);display:grid;grid-template-columns:22px 1fr;grid-template-rows:auto 1fr auto auto}
.tb-thermo__t{grid-column:1/3;font:600 13px var(--h);color:var(--gr2);padding-left:2px}
.tb-thermo__tube{grid-column:1;grid-row:2;justify-self:center;position:relative;width:10px;border-radius:6px;background:#fff;box-shadow:inset 0 0 0 1px var(--ice2),0 4px 14px rgba(30,42,54,.08);margin:8px 0}
.tb-thermo__hg{position:absolute;left:2px;right:2px;bottom:-14px;border-radius:4px;height:var(--hg,10%);background:linear-gradient(0deg,#9CC3DD,#5B3FD0 40%,#D4337A 70%,#F2A541);transition:height .6s cubic-bezier(.2,.8,.2,1)}
.tb-thermo__bulb{grid-column:1;grid-row:3;justify-self:center;width:22px;height:22px;border-radius:50%;background:#9CC3DD;box-shadow:0 0 0 4px #fff,0 4px 14px rgba(30,42,54,.15);margin-top:-6px}
.tb-thermo__t--bot{grid-row:4;margin-top:8px}
.tb-thermo ol{grid-column:2;grid-row:2;list-style:none;margin:8px 0;padding:0 0 0 10px;display:flex;flex-direction:column;justify-content:space-between}
.tb-thermo a{position:relative;display:block;font-size:12.5px;line-height:1.2;text-decoration:none;color:var(--gr2);padding:4px 0;transition:color .2s}
.tb-thermo a::before{content:"";position:absolute;left:-19px;top:50%;width:12px;height:2px;background:var(--ice);transition:.2s}
.tb-thermo a:hover{color:var(--gr)}
.tb-thermo a.is-on{color:#E07A3A;font-weight:600}
.tb-thermo a.is-on::before{background:#E07A3A;width:16px}

/* ---------- шапка, первый экран ---------- */
.tb-top{position:absolute;top:0;left:0;right:0;display:flex;align-items:center;gap:22px;padding:22px var(--gut) 0 calc(var(--rail) + var(--gut));z-index:3}
.tb-logo{font:700 22px var(--h);text-decoration:none;letter-spacing:-.01em}
.tb-logo--sm{font-size:18px}
.tb-top__sub{margin:0;font-size:12px;line-height:1.3;color:var(--gr2);border-left:1px solid var(--ice);padding-left:14px}

section{padding:80px var(--gut) 40px calc(var(--rail) + var(--gut))}
.tb-hero{position:relative;min-height:min(90vh,720px);display:grid;align-items:center;padding-top:110px;overflow:hidden}
.tb-hero__photo{position:absolute;inset:0 0 0 28%}
.tb-hero__photo img{width:100%;height:100%;object-fit:cover;object-position:78% center;transform:scale(1.05) translate3d(0,var(--py,0),0)}
.tb-hero__photo::after{content:"";position:absolute;inset:0;background:linear-gradient(90deg,var(--frost) 0,rgba(244,247,250,.92) 22%,rgba(244,247,250,.55) 36%,rgba(244,247,250,0) 52%);pointer-events:none}
.tb-snow{position:absolute;inset:0;width:100%;height:100%;pointer-events:none}
.tb-hero__text{position:relative;z-index:2;max-width:560px}
.tb-kicker{margin:0 0 14px;font:600 12px var(--h);letter-spacing:.12em;text-transform:uppercase;color:var(--gr2)}
.tb-hero h1{font-size:clamp(40px,5vw,72px);font-weight:700}
.tb-hero h1 em{font-style:normal;display:block;background:linear-gradient(90deg,#E86B4B,#F2A541);-webkit-background-clip:text;background-clip:text;color:transparent}
.tb-lead{font-size:17px;color:var(--gr2);max-width:500px;margin:22px 0 28px}
.tb-facts{list-style:none;display:flex;flex-wrap:wrap;gap:10px;margin:0;padding:0}
.tb-facts li{display:flex;align-items:center;gap:10px;background:rgba(255,255,255,.8);backdrop-filter:blur(6px);border:1px solid var(--ice2);border-radius:10px;padding:10px 14px;font-size:12px;color:var(--gr2);line-height:1.25}
.tb-facts svg{width:22px;height:22px;flex:none;fill:none;stroke:#3E7CB1;stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round}
.tb-facts b{display:block;font:600 14px var(--h);color:var(--gr)}

.tb-head{display:flex;flex-direction:column;gap:12px;margin-bottom:28px;max-width:860px}
.tb-head p{margin:0;color:var(--gr2);max-width:640px}

/* ---------- слои ---------- */
.tb-layers__grid{display:grid;grid-template-columns:250px 1fr 250px;gap:24px;align-items:start}
.tb-switches{display:flex;flex-direction:column;gap:8px}
.tb-sw{display:grid;grid-template-columns:26px 1fr 42px;align-items:center;gap:10px;text-align:left;background:#fff;border:1px solid var(--ice2);border-radius:12px;padding:12px 12px;cursor:pointer;
  box-shadow:0 4px 14px rgba(30,42,54,.05);transition:border-color .2s,transform .2s}
.tb-sw:hover{transform:translateX(3px);border-color:var(--ice)}
.tb-sw__n{display:grid;place-items:center;width:24px;height:24px;border-radius:50%;background:var(--frost2);font:600 12px var(--h);color:var(--gr2)}
.tb-sw__t{font-size:14px;font-weight:500;line-height:1.2}
.tb-sw__k{position:relative;width:42px;height:24px;border-radius:12px;background:#D6E2EA;transition:background .3s}
.tb-sw__k::after{content:"";position:absolute;left:3px;top:3px;width:18px;height:18px;border-radius:50%;background:#fff;box-shadow:0 1px 4px rgba(0,0,0,.2);transition:transform .3s cubic-bezier(.2,.8,.2,1)}
.tb-sw[aria-pressed="true"] .tb-sw__k{background:var(--heat)}
.tb-sw[aria-pressed="true"] .tb-sw__k::after{transform:translateX(18px)}
.tb-sw[aria-pressed="true"] .tb-sw__n{background:#F2A541;color:#fff}
.tb-sw.is-focus{border-color:#E07A3A;box-shadow:0 0 0 3px rgba(242,165,65,.18)}

.tb-cut{margin:0;background:#fff;border-radius:18px;padding:14px;box-shadow:0 20px 50px rgba(30,42,54,.1)}
.tb-cut__svg{width:100%;height:auto;display:block;border-radius:10px}
.tb-air{transition:fill .6s}
.tb-l__warm,.tb-l__cold{transition:opacity .5s}
.tb-l__warm{opacity:0}
.tb-l.is-on .tb-l__warm{opacity:1}
.tb-l.is-on .tb-l__cold{opacity:0}
.tb-l[data-l="steny"].is-on .tb-l__warm{opacity:.38}
.tb-l[data-l="obogrev"] .tb-l__cold{display:none}
.tb-l.is-flash{animation:tb-flash .8s ease}
@keyframes tb-flash{40%{filter:brightness(1.35) drop-shadow(0 0 8px #F2A541)}}
.tb-wave{stroke-dasharray:8 8;animation:tb-rise 1.6s linear infinite}
@keyframes tb-rise{to{stroke-dashoffset:-32}}
.tb-cut__lbl{font:600 13px var(--h);fill:var(--gr2);letter-spacing:.08em;text-transform:uppercase}
.tb-cut__cap{font-size:14px;color:var(--gr2);padding:12px 6px 4px;min-height:58px}
.tb-cut__cap b{color:var(--gr)}

.tb-result{background:#fff;border:1px solid var(--ice2);border-radius:16px;padding:20px;box-shadow:0 10px 30px rgba(30,42,54,.06)}
.tb-result h3{font-size:20px;margin-bottom:14px}
.tb-scale{display:grid;grid-template-columns:16px 1fr;gap:14px}
.tb-scale__tube{position:relative;border-radius:8px;background:linear-gradient(0deg,#9CC3DD,#5B3FD0 40%,#D4337A 70%,#F2A541);opacity:.9}
.tb-scale__tube i{position:absolute;left:50%;width:22px;height:22px;margin:-11px 0 0 -11px;border-radius:50%;background:#fff;border:4px solid var(--gr);top:var(--pos,85%);transition:top .6s cubic-bezier(.2,.8,.2,1)}
.tb-scale ol{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:14px}
.tb-scale li{opacity:.4;transition:opacity .3s}
.tb-scale li.is-on{opacity:1}
.tb-scale li b{display:block;font:600 15px var(--h)}
.tb-scale li span{display:block;font-size:12.5px;color:var(--gr2);line-height:1.4;margin-top:3px}
.tb-result__note{margin:14px 0 0;font-size:12.5px;color:#B5502E;min-height:1em}

/* ---------- остекление ---------- */
.tb-glass__grid{display:grid;grid-template-columns:1fr 1fr;gap:22px}
.tb-gl{background:#fff;border:1px solid var(--ice2);border-radius:16px;overflow:hidden;box-shadow:0 10px 30px rgba(30,42,54,.06);transition:transform .3s}
.tb-gl:hover{transform:translateY(-4px)}
.tb-gl svg{width:100%;height:auto;display:block}
.tb-gl svg text{font:500 13px var(--t);fill:var(--gr2)}
.tb-gl h3,.tb-gl p,.tb-gl dl{margin-left:22px;margin-right:22px}
.tb-gl h3{font-size:22px;margin-top:18px}
.tb-gl__sub{color:var(--mute);font-size:13px;margin-top:4px;margin-bottom:10px}
.tb-gl p{font-size:14.5px;color:var(--gr2)}
.tb-gl--cold .tb-gl__arr{animation:tb-leak 1.6s ease-in-out infinite}
@keyframes tb-leak{50%{transform:translateX(8px)}}
.tb-bars{margin-top:16px;margin-bottom:22px;display:flex;flex-direction:column;gap:10px}
.tb-bars div{display:grid;grid-template-columns:150px 1fr;align-items:center;gap:12px;font-size:13px}
.tb-bars dd{margin:0;height:10px;border-radius:6px;background:var(--frost2);position:relative;overflow:hidden}
.tb-bars dd::after{content:"";position:absolute;inset:0;width:calc(var(--v)*100%);border-radius:6px;transform-origin:left;transform:scaleX(var(--grow,1));transition:transform 1s cubic-bezier(.2,.8,.2,1)}
.tb-gl--cold .tb-bars dd::after{background:linear-gradient(90deg,#6FA6CC,#9CC3DD)}
.tb-gl--warm .tb-bars dd::after{background:var(--heat)}
.tb-note{font-size:13px;color:var(--mute);margin:18px 0 0}

/* ---------- мостики ---------- */
.tb-bridges__grid{display:grid;grid-template-columns:1.1fr 1fr;gap:26px;align-items:start}
.tb-plan{position:relative;border-radius:18px;overflow:hidden;box-shadow:0 20px 50px rgba(30,42,54,.15)}
.tb-plan svg{width:100%;height:auto;display:block}
.tb-plan__lbl{font:600 13px var(--h);fill:#fff;opacity:.8;letter-spacing:.1em;text-transform:uppercase}
.tb-cold{animation:tb-breathe 3s ease-in-out infinite}
@keyframes tb-breathe{50%{opacity:.75}}
.tb-bp{position:absolute;left:var(--x);top:var(--y);width:34px;height:34px;margin:-17px 0 0 -17px;border-radius:50%;border:2px solid #fff;background:var(--gr);color:#fff;font:600 14px var(--h);cursor:pointer;transition:transform .2s,background .2s}
.tb-bp:hover{transform:scale(1.12)}
.tb-bp.is-on{background:#2E5BD8;transform:scale(1.18)}
.tb-bp.is-on::after{content:"";position:absolute;inset:-9px;border-radius:50%;border:2px solid #fff;animation:tb-ping 1.8s infinite}
@keyframes tb-ping{0%{transform:scale(.6);opacity:1}100%{transform:scale(1.4);opacity:0}}
.tb-blist{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:8px}
.tb-blist li{display:grid;grid-template-columns:54px 1fr;gap:14px;align-items:start;background:#fff;border:1px solid var(--ice2);border-radius:12px;padding:12px;cursor:pointer;transition:border-color .2s,box-shadow .2s}
.tb-blist li:hover{border-color:var(--ice)}
.tb-blist li.is-on{border-color:#2E5BD8;box-shadow:0 0 0 3px rgba(46,91,216,.12)}
.tb-blist i{display:block;width:54px;height:54px;border-radius:8px;background:var(--th,linear-gradient(135deg,#2E5BD8,#5B3FD0 50%,#D4337A 80%,#F2A541))}
.tb-blist b{display:block;font:600 15px var(--h)}
.tb-blist span{display:block;font-size:13px;color:var(--gr2);line-height:1.45;margin-top:3px}

/* ---------- приглашение ---------- */
.tb-invite{position:relative;margin-top:60px;overflow:hidden;background:var(--night);color:#fff;display:grid;grid-template-columns:1fr 380px;gap:30px;align-items:center;padding-top:70px;padding-bottom:70px}
.tb-invite__bg{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;opacity:.55}
.tb-invite::before{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(20,32,58,.95) 0,rgba(20,32,58,.6) 50%,rgba(20,32,58,.2));z-index:1}
.tb-invite__text,.tb-invite__chart{position:relative;z-index:2}
.tb-invite p{color:#C9D6E6;max-width:520px;margin:16px 0 26px}
.tb-invite__chart text{font:500 12px var(--t);fill:#fff;opacity:.85}
.tb-dew{stroke-dasharray:420;stroke-dashoffset:420;transition:stroke-dashoffset 1.8s ease}
.tb-invite.in .tb-dew{stroke-dashoffset:0}
.tb-dew__dot{animation:tb-ping2 2s infinite}
@keyframes tb-ping2{50%{r:10}}
.tb-btn{display:inline-flex;align-items:center;gap:12px;font-weight:500;text-decoration:none;padding:14px 24px;border-radius:999px;background:linear-gradient(90deg,#E86B4B,#F2A541);color:#fff;transition:transform .2s}
.tb-btn i{font-style:normal;transition:transform .2s}
.tb-btn:hover{transform:translateY(-2px)}
.tb-btn:hover i{transform:translateX(4px)}
.tb-btn--ghost{background:transparent;border:1.5px solid rgba(255,255,255,.7)}
.tb-btn--ghost:hover{background:rgba(255,255,255,.1)}

/* ---------- FAQ ---------- */
.tb-faq{padding-bottom:70px}
.tb-faq__grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;align-items:start}
.tb-faq details{background:#fff;border:1px solid var(--ice2);border-radius:14px;padding:18px;box-shadow:0 6px 20px rgba(30,42,54,.05)}
.tb-faq summary{list-style:none;cursor:pointer;font:600 15px/1.3 var(--h);display:flex;flex-direction:column;gap:12px}
.tb-faq summary::-webkit-details-marker{display:none}
.tb-faq summary svg{width:28px;height:28px;fill:none;stroke:#3E7CB1;stroke-width:1.6;stroke-linecap:round}
.tb-faq summary::after{content:"→";width:28px;height:28px;border-radius:50%;display:grid;place-items:center;background:var(--frost2);font-size:14px;transition:transform .25s}
.tb-faq details[open] summary::after{transform:rotate(90deg);background:#F2A541;color:#fff}
.tb-faq details p{margin:12px 0 0;font-size:14px;color:var(--gr2)}

/* ---------- подвал ---------- */
.tb-foot{background:var(--night);color:#C9D6E6;display:grid;grid-template-columns:auto 1fr auto;gap:30px;align-items:center;padding:28px var(--gut) 32px calc(var(--rail) + var(--gut));font-size:13px}
.tb-foot p{margin:4px 0 0}
.tb-foot .tb-logo{color:#fff}
.tb-foot nav{display:flex;gap:20px;justify-content:center}
.tb-foot nav a{text-decoration:none}
.tb-foot nav a:hover{color:#F2A541}
.tb-foot > p{text-align:right;max-width:420px;font-size:12px;opacity:.8}

/* ---------- появление ---------- */
.rv{opacity:0;transform:translateY(24px);transition:opacity .7s,transform .7s cubic-bezier(.2,.8,.2,1)}
.rv.in{opacity:1;transform:none}

/* ---------- адаптив ---------- */
@media (max-width:1180px){
  .tb-layers__grid{grid-template-columns:230px 1fr}
  .tb-result{grid-column:1/-1}
  .tb-scale ol{flex-direction:row}
  .tb-scale{grid-template-columns:1fr}
  .tb-scale__tube{height:12px;background:linear-gradient(90deg,#F2A541,#D4337A 30%,#5B3FD0 60%,#9CC3DD)}
  .tb-scale__tube i{top:50%;left:var(--posx,85%)}
  .tb-faq__grid{grid-template-columns:1fr 1fr}
}
@media (max-width:820px){
  :root{--rail:0px}
  .tb-thermo{top:auto;left:0;right:0;bottom:0;width:auto;height:54px;display:block;padding:0;border-radius:0;box-shadow:none;background:rgba(244,247,250,.94);backdrop-filter:blur(8px);border-top:1px solid var(--ice2)}
  .tb-thermo__t,.tb-thermo__bulb{display:none}
  .tb-thermo__tube{position:absolute;left:0;right:0;top:0;width:auto;height:4px;margin:0;border-radius:0;box-shadow:none}
  .tb-thermo__hg{top:0;bottom:0;left:0;right:auto;height:auto!important;width:var(--hg,10%);border-radius:0;background:var(--heat);transition:width .6s}
  .tb-thermo ol{flex-direction:row;overflow-x:auto;gap:16px;margin:0;padding:16px 16px 0;scrollbar-width:none}
  .tb-thermo a{white-space:nowrap;padding:2px 0}
  .tb-thermo a::before{display:none}
  body{padding-bottom:54px}
  section{padding:56px var(--gut) 24px}
  .tb-top{padding:18px var(--gut) 0}
  .tb-top .tb-logo{font-size:18px}
  .tb-top__sub{display:none}
  .tb-hero{display:block;padding:0 0 20px;min-height:0}
  .tb-hero__photo{position:relative;inset:auto;height:64vw;margin-top:64px}
  .tb-hero__photo::after{background:linear-gradient(0deg,var(--frost) 0,rgba(244,247,250,0) 40%)}
  .tb-hero__text{padding:0 var(--gut);margin-top:-24px}
  .tb-layers__grid,.tb-glass__grid,.tb-bridges__grid{grid-template-columns:1fr}
  .tb-switches{display:grid;grid-template-columns:1fr 1fr}
  .tb-sw{grid-template-columns:22px 1fr 36px;padding:10px;gap:8px}
  .tb-sw__t{font-size:12.5px}
  .tb-sw__k{width:36px;height:20px}
  .tb-sw__k::after{width:14px;height:14px}
  .tb-sw[aria-pressed="true"] .tb-sw__k::after{transform:translateX(16px)}
  .tb-scale ol{flex-direction:column}
  .tb-scale{grid-template-columns:16px 1fr}
  .tb-scale__tube{height:auto;background:linear-gradient(0deg,#9CC3DD,#5B3FD0 40%,#D4337A 70%,#F2A541)}
  .tb-scale__tube i{left:50%;top:var(--pos,85%)}
  .tb-bars div{grid-template-columns:120px 1fr}
  .tb-invite{grid-template-columns:1fr}
  .tb-faq__grid{grid-template-columns:1fr}
  .tb-foot{grid-template-columns:1fr;padding:24px var(--gut) 30px}
  .tb-foot nav{justify-content:flex-start;flex-wrap:wrap}
  .tb-foot > p{text-align:left}
}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation:none!important;transition:none!important}
  .rv{opacity:1;transform:none}
  .tb-dew{stroke-dashoffset:0}
}