:root{
      --blue:#0b4bb8;
      --blue-dark:#06377f;
      --blue-soft:#eef5ff;
      --text:#151a23;
      --muted:#5d6878;
      --line:#dce6f3;
      --bg:#f7faff;
      --white:#fff;
      --shadow:0 12px 28px rgba(26,67,121,.10);
    }

    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{
      margin:0;
      font-family:Inter,Arial,Helvetica,sans-serif;
      color:var(--text);
      background:#fff;
      line-height:1.55;
    }
    a{text-decoration:none;color:inherit}
    .container{width:min(1180px,calc(100% - 40px));margin:auto}

    /* HEADER */
    .site-header{
      position:sticky;
      top:0;
      z-index:30;
      background:rgba(255,255,255,.97);
      backdrop-filter:blur(12px);
      border-bottom:1px solid #edf2f8;
    }
    .header-inner{
      min-height:80px;
      display:flex;
      align-items:center;
      justify-content:space-between;
      gap:28px;
    }
    .brand{display:flex;flex-direction:column;line-height:.92}
    .brand strong{font-size:29px;letter-spacing:-1.7px;color:#555b63}
    .brand span{font-size:16px;font-weight:800;margin-left:25px;color:#252a31}
    .nav{display:flex;gap:22px;align-items:center;font-size:15px;font-weight:700}
    .nav a{position:relative;padding:29px 0 24px;white-space:nowrap}
    .nav a:hover,.nav a.active{color:var(--blue)}
    .nav a.active:after{
      content:"";
      position:absolute;left:0;right:0;bottom:16px;
      height:3px;border-radius:99px;background:var(--blue)
    }
    .menu-toggle{
      display:none;width:44px;height:44px;border:1px solid var(--line);
      background:#fff;border-radius:12px;font-size:23px
    }

    /* HERO */
    .hero{
      position:relative;
      overflow:hidden;
      background:
        radial-gradient(circle at 66% 45%,rgba(255,255,255,.98),rgba(235,243,252,.88) 38%,rgba(214,226,241,.95) 70%),
        linear-gradient(120deg,#f9fcff,#dbe8f6);
    }
    .hero:before{
      content:"";position:absolute;inset:0;
      background:
        linear-gradient(30deg,transparent 47%,rgba(255,255,255,.65) 48%,transparent 49%),
        linear-gradient(150deg,transparent 47%,rgba(255,255,255,.65) 48%,transparent 49%);
      background-size:66px 114px;
      opacity:.34;
      mask-image:linear-gradient(90deg,transparent 20%,#000 55%,transparent 84%);
    }
    .hero-grid{
      position:relative;z-index:1;
      min-height:395px;
      display:grid;
      grid-template-columns:1fr 1fr;
      align-items:center;
      gap:28px;
    }
    h1{
      margin:0;
      font-size:60px;
      line-height:1;
      letter-spacing:-3px;
      color:var(--blue);
    }
    .title-line{width:58px;height:5px;background:var(--blue);border-radius:99px;margin:22px 0 18px}
    .hero-copy{max-width:540px;font-size:18px;color:#27303d;margin:0 0 24px}
    .phones{display:flex;gap:26px;align-items:center;flex-wrap:wrap;margin-bottom:26px}
    .phone-item{display:flex;align-items:center;gap:12px;padding-right:25px;border-right:1px solid #97abc5}
    .phone-item:last-child{border-right:none}
    .phone-icon{width:34px;height:34px;display:grid;place-items:center;color:var(--blue);font-size:27px}
    .phone-item small{display:block;font-size:13px;color:#435063}
    .phone-item strong{display:block;font-size:22px;color:var(--blue-dark)}
    .cta-row{display:flex;gap:15px;flex-wrap:wrap}
    .btn{
      min-height:56px;padding:0 25px;
      display:inline-flex;align-items:center;justify-content:center;gap:11px;
      border-radius:8px;border:2px solid var(--blue);
      font-weight:800;transition:.25s ease;
    }
    .btn-primary{background:var(--blue);color:#fff}
    .btn-secondary{background:rgba(255,255,255,.8);color:var(--blue)}
    .btn:hover{transform:translateY(-2px)}

    .hero-art{
      min-height:380px;
      display:flex;
      justify-content:flex-end;
      align-items:flex-end;
      position:relative;
    }
    .boiler{
      position:relative;
      width:280px;height:330px;
      margin-right:65px;
      background:linear-gradient(135deg,#fff,#f8fafc 50%,#dde5ee);
      border:1px solid #e4e9ef;border-radius:8px 8px 16px 16px;
      box-shadow:19px 19px 42px rgba(39,57,81,.18),inset -13px 0 20px rgba(115,135,158,.18)
    }
    .boiler:before{
      content:"";position:absolute;left:50%;top:-60px;transform:translateX(-50%);
      width:60px;height:62px;border-radius:8px 8px 0 0;
      background:linear-gradient(90deg,#cbd4df,#fff,#abb7c4)
    }
    .boiler-logo{position:absolute;left:0;right:0;top:160px;text-align:center;font-size:12px;color:#555b62;font-weight:700}
    .control{
      position:absolute;left:50%;bottom:58px;transform:translateX(-50%);
      width:138px;height:86px;border-radius:13px;
      background:linear-gradient(145deg,#414850,#11171e);
      box-shadow:inset 0 0 0 3px #858b92
    }
    .screen{
      width:66px;height:34px;margin:11px auto 5px;border-radius:4px;
      display:grid;place-items:center;background:#052d70;color:#72caff;
      font:700 23px monospace;box-shadow:0 0 9px rgba(0,125,255,.75) inset
    }
    .knob{width:25px;height:25px;margin:auto;border-radius:50%;background:radial-gradient(circle at 35% 30%,#e3e8ed,#4d545d 50%,#181c22 55%)}
    .pipes{position:absolute;left:50%;bottom:-74px;transform:translateX(-50%);display:flex;gap:18px}
    .pipe{width:14px;height:80px;background:linear-gradient(90deg,#7c8793,#fff,#65717d);border-top:9px solid #aa793b}
    .plant{position:absolute;right:-20px;bottom:-5px;width:155px;height:205px;opacity:.7}
    .leaf{position:absolute;width:72px;height:31px;background:#7ba93a;border-radius:80% 10% 80% 10%;transform-origin:left center}
    .leaf:nth-child(1){top:50px;left:16px;transform:rotate(-38deg)}
    .leaf:nth-child(2){top:89px;left:58px;transform:rotate(25deg)}
    .leaf:nth-child(3){top:126px;left:18px;transform:rotate(-18deg)}
    .leaf:nth-child(4){top:165px;left:57px;transform:rotate(28deg)}

    /* COMMON */
    .section{padding:38px 0}
    .section-soft{background:linear-gradient(#fbfdff,#f5f9fe)}
    .section-title{
      margin:0 0 18px;
      text-align:center;
      font-size:34px;
      letter-spacing:-1px;
    }
    .section-title:after{
      content:"";display:block;width:48px;height:4px;
      background:var(--blue);border-radius:99px;margin:10px auto 0
    }
    .intro{
      max-width:880px;
      margin:0 auto 24px;
      text-align:center;
      color:var(--muted);
      font-size:15px;
    }

    /* BENEFITS */
    .benefit-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
    .benefit-card{
      border:1px solid var(--line);
      border-radius:16px;
      background:#fff;
      box-shadow:var(--shadow);
      padding:22px 18px;
      display:flex;
      gap:14px;
      align-items:center;
    }
    .icon-circle{
      width:64px;height:64px;border-radius:50%;
      display:grid;place-items:center;
      background:var(--blue-soft);color:var(--blue);
      font-size:29px;flex:0 0 64px
    }
    .benefit-card h3{margin:0 0 6px;color:var(--blue-dark);font-size:16px}
    .benefit-card p{margin:0;color:var(--muted);font-size:12px}

    /* SERVICE CONTENT */
    .service-box{
      margin-top:18px;
      border:1px solid #d8e5f4;
      border-radius:18px;
      overflow:hidden;
      display:grid;
      grid-template-columns:48% 52%;
      min-height:335px;
      background:linear-gradient(115deg,#e5effa,#fbfdff);
    }
    .service-art{position:relative;overflow:hidden;background:linear-gradient(135deg,#c7d9ec,#eef5fb)}
    .tech-body{
      position:absolute;left:38px;bottom:-10px;width:220px;height:285px;
      background:#0a2343;border-radius:90px 90px 0 0;transform:rotate(-8deg)
    }
    .tech-head{
      position:absolute;left:88px;top:17px;width:72px;height:80px;
      background:#d2a079;border-radius:48%
    }
    .toolbox{
      position:absolute;right:30px;bottom:18px;width:155px;height:98px;
      background:#151c24;border-radius:12px;box-shadow:0 14px 20px rgba(0,0,0,.22)
    }
    .boiler-small{
      position:absolute;right:85px;top:30px;width:155px;height:190px;
      background:linear-gradient(135deg,#fff,#dfe6ee);border-radius:7px;
      box-shadow:0 12px 24px rgba(45,65,88,.18)
    }
    .boiler-small:after{
      content:"E01";position:absolute;left:50%;top:84px;transform:translateX(-50%);
      width:80px;height:45px;display:grid;place-items:center;border-radius:8px;
      background:#111923;color:#66c5ff;font:700 24px monospace
    }
    .service-list{padding:34px}
    .service-list h2{margin:0 0 18px;color:var(--blue-dark);font-size:30px}
    .service-list ul{list-style:none;padding:0;margin:0}
    .service-list li{
      display:flex;gap:11px;align-items:flex-start;
      margin:12px 0;color:#324052;font-size:14px;
    }
    .check{
      width:21px;height:21px;border-radius:50%;
      background:var(--blue);color:#fff;
      display:grid;place-items:center;font-size:12px;flex:0 0 21px;
      margin-top:1px;
    }

    /* ADVANTAGES */
    .advantage-grid{display:grid;grid-template-columns:repeat(6,1fr);gap:14px}
    .advantage-card{
      text-align:center;
      border:1px solid var(--line);
      border-radius:15px;
      padding:20px 12px;
      background:#fff;
      box-shadow:var(--shadow);
    }
    .advantage-card .icon-circle{width:58px;height:58px;font-size:27px;margin:0 auto 11px}
    .advantage-card h3{margin:0 0 7px;color:var(--blue-dark);font-size:14px}
    .advantage-card p{margin:0;color:var(--muted);font-size:12px}

    /* PROCESS */
    .process-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
    .process-item{text-align:center;position:relative;padding:0 14px}
    .process-item:not(:last-child):after{
      content:"";position:absolute;top:37px;right:-19%;width:38%;
      border-top:2px dashed #90ace0
    }
    .process-number{
      width:27px;height:27px;border-radius:50%;display:grid;place-items:center;
      background:var(--blue);color:#fff;font-weight:800;font-size:13px;
      margin:0 auto 10px
    }
    .process-icon{
      width:70px;height:70px;margin:0 auto 12px;border-radius:50%;
      display:grid;place-items:center;background:var(--blue-soft);
      color:var(--blue);font-size:30px;border:1px solid #d8e5f5
    }
    .process-item h3{margin:0 0 7px;color:var(--blue-dark);font-size:15px}
    .process-item p{margin:0;color:var(--muted);font-size:12px}

    /* REGIONS */
    .region-box{
      border:1px solid var(--line);
      border-radius:18px;
      background:#fff;
      padding:24px;
      box-shadow:var(--shadow);
    }
    .regions{display:grid;grid-template-columns:1fr 1fr;gap:20px}
    .region-card{
      border:1px solid #dbe6f3;
      border-radius:14px;
      padding:20px;
      display:flex;gap:18px;align-items:center;
      background:linear-gradient(115deg,#fbfdff,#f3f8fe);
    }
    .region-icon{
      width:92px;height:72px;border-radius:14px;
      display:grid;place-items:center;background:var(--blue-soft);
      color:var(--blue);font-size:42px;flex:0 0 92px
    }
    .region-card h3{margin:0 0 7px;color:var(--blue-dark);font-size:17px}
    .region-card p{margin:0;color:var(--muted);font-size:13px}

    /* FAQ */
    .faq-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}
    details{
      border:1px solid var(--line);
      border-radius:12px;
      background:#fff;
      box-shadow:var(--shadow);
      padding:0 18px;
    }
    summary{
      list-style:none;
      cursor:pointer;
      padding:17px 0;
      font-weight:800;
      color:var(--blue-dark);
      display:flex;align-items:center;justify-content:space-between;gap:12px;
    }
    summary::-webkit-details-marker{display:none}
    summary:before{
      content:"?";
      width:24px;height:24px;border-radius:50%;
      display:grid;place-items:center;
      background:var(--blue);color:#fff;font-size:13px;flex:0 0 24px
    }
    summary span{flex:1}
    details p{margin:0 0 17px 36px;color:var(--muted);font-size:13px}

    /* EMERGENCY + FOOTER */
    .emergency{background:linear-gradient(90deg,#073b94,#0758d2);color:#fff}
    .emergency-inner{
      min-height:124px;
      display:grid;
      grid-template-columns:1.25fr 1fr 1fr;
      gap:28px;
      align-items:center
    }
    .emergency-main{display:flex;align-items:center;gap:20px}
    .emergency-icon{
      width:72px;height:72px;border:2px solid #fff;border-radius:50%;
      display:grid;place-items:center;font-size:33px
    }
    .emergency h2{margin:0;font-size:25px}
    .emergency p{margin:2px 0 0;color:#dfeaff;font-size:13px}
    .emergency-phone{border-left:1px solid rgba(255,255,255,.5);padding-left:28px}
    .emergency-phone small{display:block}
    .emergency-phone strong{display:block;font-size:25px}

    footer{background:#fff}
    .footer-main{
      padding:42px 0;
      display:grid;
      grid-template-columns:1.25fr 1fr 1fr 1fr;
      gap:42px
    }
    .footer-main h4{margin:0 0 14px;font-size:14px}
    .footer-main p,.footer-main li{color:#4d5968;font-size:13px}
    .footer-main ul{list-style:none;padding:0;margin:0}
    .footer-main li{margin:8px 0}
    .socials{display:flex;gap:10px;margin-top:17px}
    .socials a{
      width:33px;height:33px;border-radius:50%;display:grid;place-items:center;
      background:#4d555f;color:#fff;font-weight:900
    }
    .footer-bottom{background:#444d59;color:#fff;padding:17px 0;font-size:12px}
    .footer-bottom .container{display:flex;justify-content:space-between;gap:18px;flex-wrap:wrap}

    @media(max-width:1050px){
      .menu-toggle{display:block}
      .nav{
        display:none;position:absolute;top:80px;left:0;right:0;
        background:#fff;flex-direction:column;align-items:flex-start;gap:0;
        padding:18px 22px;box-shadow:var(--shadow)
      }
      .nav.open{display:flex}
      .nav a{width:100%;padding:12px 0}
      .nav a.active:after{bottom:4px}
      .hero-grid{grid-template-columns:1fr;padding:58px 0 15px}
      .hero-art{min-height:350px}
      .benefit-grid{grid-template-columns:repeat(2,1fr)}
      .service-box{grid-template-columns:1fr}
      .service-art{min-height:300px}
      .advantage-grid{grid-template-columns:repeat(3,1fr)}
      .process-grid{grid-template-columns:repeat(2,1fr)}
      .process-item:nth-child(2):after{display:none}
      .regions{grid-template-columns:1fr}
      .emergency-inner{grid-template-columns:1fr;padding:28px 0}
      .emergency-phone{border-left:0;border-top:1px solid rgba(255,255,255,.35);padding:17px 0 0}
      .footer-main{grid-template-columns:repeat(2,1fr)}
    }

    @media(max-width:700px){
      .container{width:min(100% - 26px,1180px)}
      .brand strong{font-size:24px}
      .brand span{font-size:14px}
      h1{font-size:48px;letter-spacing:-2px}
      .hero-copy{font-size:16px}
      .phone-item{width:100%;border-right:0;padding-right:0}
      .cta-row .btn{width:100%}
      .hero-art{min-height:310px}
      .boiler{width:210px;height:260px;margin-right:35px}
      .boiler-logo{top:126px}
      .control{width:110px;height:70px;bottom:45px}
      .screen{width:55px;height:29px;font-size:19px}
      .benefit-grid,.advantage-grid,.process-grid,.faq-grid,.footer-main{grid-template-columns:1fr}
      .process-item:after{display:none!important}
      .region-card{align-items:flex-start}
      .region-icon{width:70px;height:62px;flex-basis:70px;font-size:34px}
    }