:root{
    --charcoal:#0B3A63;
    --charcoal-soft:#2C567F;
    --glass:#F3F8FC;
    --glass-2:#E4EFF8;
    --panel:#FFFFFF;
    --steel:#4FA8DA;
    --steel-deep:#2E7BAE;
    --amber:#2F8FE0;
    --amber-deep:#1B6FB5;
    --line:rgba(11,58,99,0.14);
    --line-soft:rgba(11,58,99,0.08);
    --ink-soft:#4C6A82;
    --radius:2px;
  }
  *{box-sizing:border-box;}
  html{scroll-behavior:smooth;}
  body{
    margin:0;
    background:var(--glass);
    color:var(--charcoal);
    font-family:'Inter',sans-serif;
    -webkit-font-smoothing:antialiased;
    overflow-x:hidden;
  }
  h1,h2,h3,.disp{
    font-family:'Space Grotesk',sans-serif;
    font-weight:600;
    letter-spacing:-0.01em;
    margin:0;
  }
  .mono{font-family:'IBM Plex Mono',monospace;}
  a{color:inherit;}
  img{max-width:100%;display:block;}
  .wrap{max-width:1180px;margin:0 auto;padding:0 24px;}
  section{position:relative;}

  /* mullion divider - the window cross-bar motif used throughout */
  .mullion-x{
    position:relative;
    height:44px;
  }
  .mullion-x::before{
    content:"";
    position:absolute;left:0;right:0;top:50%;
    height:1px;background:var(--line);
  }
  .mullion-x::after{
    content:"";
    position:absolute;left:50%;top:0;bottom:0;
    width:1px;background:var(--line);
  }
  .eyebrow{
    display:flex;align-items:center;gap:10px;
    font-family:'IBM Plex Mono',monospace;
    font-size:12.5px;letter-spacing:0.08em;text-transform:uppercase;
    color:var(--steel-deep);margin-bottom:14px;
  }
  .eyebrow::before{
    content:"";width:18px;height:18px;border:1px solid var(--steel);
    background:
      linear-gradient(var(--steel) 0 0) center/1px 100% no-repeat,
      linear-gradient(90deg,var(--steel) 0 0) center/100% 1px no-repeat;
    opacity:.6;
    flex:none;
  }

  /* ===== HEADER ===== */
  header{
    position:sticky;top:0;z-index:100;
    background:rgba(239,243,244,0.9);
    backdrop-filter:blur(10px);
    border-bottom:1px solid var(--line);
  }
  .nav-inner{
    display:flex;align-items:center;justify-content:space-between;
    height:78px;
  }
  .logo{display:flex;align-items:center;gap:12px;text-decoration:none;color:var(--charcoal);}
  .logo-mark{width:44px;height:44px;flex:none;object-fit:contain;background:#fff;border-radius:6px;border:1px solid var(--line);padding:3px;}
  .logo-text{line-height:1.05;}
  .logo-text .l1{font-family:'Space Grotesk',sans-serif;font-weight:700;font-size:19px;letter-spacing:0.01em;}
  .logo-text .l2{font-family:'IBM Plex Mono',monospace;font-size:10.5px;letter-spacing:0.12em;text-transform:uppercase;color:var(--ink-soft);}
  nav.links{display:flex;gap:32px;align-items:center;}
  nav.links a{
    text-decoration:none;color:var(--charcoal-soft);font-size:14.5px;font-weight:500;
    position:relative;padding:4px 0;
  }
  nav.links a:hover{color:var(--steel-deep);}
  .header-cta{display:flex;align-items:center;gap:18px;}
  .phone-link{
    display:flex;align-items:center;gap:8px;
    font-family:'IBM Plex Mono',monospace;font-size:14.5px;font-weight:600;
    text-decoration:none;color:var(--charcoal);
  }
  .phone-link svg{flex:none;}
  .btn{
    display:inline-flex;align-items:center;justify-content:center;gap:8px;
    padding:12px 22px;font-size:14.5px;font-weight:600;font-family:'Inter',sans-serif;
    text-decoration:none;border-radius:var(--radius);cursor:pointer;border:1px solid transparent;
    transition:transform .15s ease, background .15s ease, border-color .15s ease;
  }
  .btn:active{transform:translateY(1px);}
  .btn-amber{background:var(--amber);color:#fff;}
  .btn-amber:hover{background:var(--amber-deep);}
  .btn-outline{background:transparent;border-color:var(--charcoal);color:var(--charcoal);}
  .btn-outline:hover{background:var(--charcoal);color:var(--glass);}
  .btn-steel{background:var(--steel);color:#fff;}
  .btn-steel:hover{background:var(--steel-deep);}
  .btn-block{width:100%;}
  .menu-toggle{display:none;background:none;border:none;cursor:pointer;padding:8px;}

  /* ===== HERO ===== */
  .hero{padding:76px 0 0;overflow:hidden;}
  .hero-grid{
    display:grid;grid-template-columns:1.1fr 0.9fr;gap:56px;align-items:center;
    padding-bottom:60px;
  }
  .hero h1{font-size:clamp(34px,4.4vw,58px);line-height:1.04;}
  .hero h1 em{
    font-style:normal;color:var(--steel-deep);
    background:linear-gradient(180deg,transparent 62%,rgba(47,143,224,.30) 62%);
  }
  .hero p.lead{
    margin:22px 0 32px;font-size:17px;line-height:1.6;color:var(--ink-soft);max-width:480px;
  }
  .hero-actions{display:flex;gap:14px;flex-wrap:wrap;}
  .trust-row{
    display:flex;gap:28px;margin-top:44px;flex-wrap:wrap;
    padding-top:26px;border-top:1px solid var(--line);
  }
  .trust-item .num{font-family:'Space Grotesk',sans-serif;font-weight:700;font-size:26px;}
  .trust-item .lbl{font-size:12.5px;color:var(--ink-soft);margin-top:2px;}

  /* hero window visual - four panes, one lit amber like sunset on glass */
  .hero-visual{position:relative;aspect-ratio:1/1.05;}
  .window-frame{
    width:100%;height:100%;background:var(--charcoal);
    padding:14px;border-radius:2px;
    display:grid;grid-template-columns:1fr 1fr;grid-template-rows:1fr 1fr;gap:8px;
    box-shadow:0 30px 60px -20px rgba(20,24,27,.35);
  }
  .pane{
    background:linear-gradient(155deg,#DDE8EA 0%, #C9DADD 55%, #B9CFD3 100%);
    position:relative;overflow:hidden;
  }
  .pane.sun{background:linear-gradient(155deg,#8FCBF0 0%, var(--amber) 55%, var(--amber-deep) 100%);}
  .pane::after{
    content:"";position:absolute;inset:0;
    background:linear-gradient(115deg,rgba(255,255,255,.55) 0%, rgba(255,255,255,0) 26%);
  }
  .hero-badge{
    position:absolute;bottom:-18px;left:-18px;
    background:var(--panel);border:1px solid var(--line);padding:14px 18px;
    box-shadow:0 14px 30px -12px rgba(20,24,27,.2);
    display:flex;align-items:center;gap:12px;
  }
  .hero-badge .stars{color:var(--amber-deep);font-size:13px;letter-spacing:2px;}
  .hero-badge .score{font-family:'Space Grotesk',sans-serif;font-weight:700;font-size:20px;}
  .hero-badge .cnt{font-size:12px;color:var(--ink-soft);}

  /* ===== SUPPORT BANNER ===== */
  .support-banner{
    background:var(--charcoal);color:var(--glass);
  }
  .support-inner{
    display:flex;align-items:center;justify-content:space-between;gap:24px;
    padding:22px 0;flex-wrap:wrap;
  }
  .support-inner .txt{display:flex;align-items:center;gap:16px;flex-wrap:wrap;}
  .support-inner strong{color:var(--amber);font-family:'Space Grotesk',sans-serif;}
  .support-inner p{margin:0;font-size:14.5px;color:#C7D0D3;}

  /* ===== SECTION GENERIC ===== */
  .section{padding:96px 0;}
  .section-head{max-width:640px;margin-bottom:56px;}
  .section-head h2{font-size:clamp(26px,3vw,38px);line-height:1.1;}
  .section-head p{color:var(--ink-soft);font-size:16px;margin-top:14px;line-height:1.6;}
  .spec-strip{
    margin-top:20px;padding:12px 16px;background:var(--glass-2);border:1px solid var(--line);
    font-size:12px;letter-spacing:.01em;color:var(--charcoal-soft);line-height:1.6;
  }
  .alt{background:var(--panel);border-top:1px solid var(--line);border-bottom:1px solid var(--line);}

  /* services grid */
  .services-grid{
    display:grid;grid-template-columns:repeat(3,1fr);gap:1px;
    background:var(--line);border:1px solid var(--line);
  }
  .service-card{
    background:var(--panel);padding:34px 28px;
    display:flex;flex-direction:column;gap:14px;
    transition:background .15s ease;
  }
  .service-card:hover{background:var(--glass-2);}
  .service-card .icon{width:34px;height:34px;color:var(--steel-deep);}
  .service-card h3{font-size:17px;}
  .service-card p{margin:0;font-size:14px;color:var(--ink-soft);line-height:1.55;}

  /* material band */
  .material-band{
    display:grid;grid-template-columns:repeat(4,1fr);gap:1px;
    background:var(--line);border:1px solid var(--line);margin-top:56px;
  }
  .material-band div{background:var(--glass);padding:26px 22px;}
  .material-band .n{font-family:'Space Grotesk',sans-serif;font-size:22px;font-weight:700;}
  .material-band .l{font-size:12.5px;color:var(--ink-soft);margin-top:6px;line-height:1.5;}

  /* ===== CALCULATOR ===== */
  .calc-wrap{
    display:grid;grid-template-columns:1fr 1fr;gap:0;
    border:1px solid var(--line);background:var(--panel);
  }
  .calc-form{padding:44px;border-right:1px solid var(--line);}
  .calc-preview{
    padding:44px;background:var(--charcoal);color:var(--glass);
    display:flex;flex-direction:column;align-items:center;justify-content:center;
    position:relative;
  }
  .field-row{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-bottom:18px;}
  .field{margin-bottom:18px;}
  .field label{
    display:block;font-size:12.5px;font-family:'IBM Plex Mono',monospace;
    text-transform:uppercase;letter-spacing:.05em;color:var(--ink-soft);margin-bottom:8px;
  }
  .field select, .field input[type=number], .field input[type=text], .field input[type=email], .field input[type=tel], .field textarea{
    width:100%;padding:12px 14px;border:1px solid var(--line);background:var(--glass);
    font-family:'Inter',sans-serif;font-size:14.5px;color:var(--charcoal);border-radius:var(--radius);
    outline:none;
  }
  .field select:focus, .field input:focus, .field textarea:focus{border-color:var(--steel);background:#fff;}
  .field textarea{resize:vertical;min-height:70px;}
  .check-row{display:flex;flex-direction:column;gap:10px;margin-bottom:22px;}
  .check-row label{display:flex;align-items:center;gap:10px;font-size:14px;cursor:pointer;}
  .check-row input{width:16px;height:16px;accent-color:var(--steel);}
  .calc-divider{height:1px;background:var(--line);margin:26px 0;}

  .price-out{
    display:flex;align-items:baseline;justify-content:space-between;
    padding:20px 0;border-top:1px dashed var(--line);margin-top:8px;
  }
  .price-out .lbl{font-size:13px;color:var(--ink-soft);}
  .price-out .val{font-family:'Space Grotesk',sans-serif;font-weight:700;font-size:28px;}
  .price-note{font-size:12px;color:var(--ink-soft);margin-top:-6px;margin-bottom:20px;line-height:1.5;}

  .preview-svg-wrap{width:100%;max-width:260px;aspect-ratio:1;display:flex;align-items:center;justify-content:center;margin-bottom:22px;}
  .preview-dims{font-family:'IBM Plex Mono',monospace;font-size:13px;color:#9FB1BA;text-align:center;margin-bottom:26px;}
  .preview-dims strong{color:var(--amber);}
  .calc-preview .mini-eyebrow{
    font-family:'IBM Plex Mono',monospace;font-size:11px;letter-spacing:.1em;text-transform:uppercase;
    color:#9FB1BA;margin-bottom:18px;
  }

  #calcForm .btn{width:100%;}
  .form-msg{margin-top:14px;font-size:13.5px;padding:10px 12px;border-left:2px solid var(--steel);background:var(--glass-2);display:none;}
  .form-msg.show{display:block;}
  .form-msg.err{border-color:#B4472C;}

  /* testimonials */
  .testi-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:28px;}
  .testi-card{background:var(--panel);border:1px solid var(--line);padding:30px 26px;}
  .testi-card .stars{color:var(--amber-deep);font-size:13px;letter-spacing:2px;margin-bottom:14px;}
  .testi-card p{font-size:14.5px;line-height:1.65;color:var(--charcoal-soft);margin:0 0 18px;}
  .testi-card .who{font-size:12.5px;color:var(--ink-soft);font-family:'IBM Plex Mono',monospace;}

  /* gallery placeholder */
  .gallery-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;}
  .gallery-item{
    aspect-ratio:4/3;margin:0;
    position:relative;overflow:hidden;border:1px solid var(--line);
  }
  .gallery-item img{width:100%;height:100%;object-fit:cover;display:block;transition:transform .35s ease;}
  .gallery-item:hover img{transform:scale(1.05);}
  .gallery-item figcaption{
    position:absolute;left:0;right:0;bottom:0;padding:22px 12px 10px;
    font-size:12px;line-height:1.4;color:#fff;
    background:linear-gradient(0deg, rgba(20,24,27,.82), rgba(20,24,27,0));
  }
  .gallery-note{margin-top:18px;font-size:13px;color:var(--ink-soft);}

  /* before / after showcase */
  .ba-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px;}
  .ba-item{position:relative;margin:0;border:1px solid var(--line);overflow:hidden;aspect-ratio:2/3;}
  .ba-item img{width:100%;height:100%;object-fit:cover;display:block;}
  .ba-item figcaption{position:absolute;top:14px;left:14px;}
  .ba-item .tag{
    background:var(--charcoal);color:#fff;font-family:'IBM Plex Mono',monospace;
    font-size:11px;letter-spacing:.08em;text-transform:uppercase;padding:6px 12px;
  }
  .ba-item .tag.amber{background:var(--amber);color:#fff;}

  /* contact */
  .contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:0;border:1px solid var(--line);}
  .contact-info{padding:44px;background:var(--charcoal);color:var(--glass);}
  .contact-info h3{font-size:20px;margin-bottom:26px;color:#fff;}
  .contact-row{display:flex;gap:14px;align-items:flex-start;margin-bottom:22px;}
  .contact-row svg{flex:none;margin-top:2px;color:var(--amber);}
  .contact-row .t{font-size:14px;line-height:1.6;color:#D3DADC;}
  .contact-row .t strong{display:block;color:#fff;font-size:14.5px;margin-bottom:2px;}
  .map-embed{border:0;width:100%;height:280px;filter:grayscale(15%);margin-top:10px;}
  .contact-form{padding:44px;background:var(--panel);}

  footer{background:var(--charcoal);color:#9FB1BA;padding:40px 0;border-top:1px solid rgba(255,255,255,.08);}
  .footer-inner{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:16px;font-size:13px;}
  .footer-inner a{color:#C7D0D3;text-decoration:none;}

  /* mobile */
  @media (max-width: 880px){
    nav.links{display:none;}
    .menu-toggle{display:block;}
    .header-cta .btn-amber-desktop{display:none;}
    .hero-grid{grid-template-columns:1fr;gap:44px;}
    .hero-visual{max-width:280px;margin:0 auto;}
    .trust-row{gap:22px;}
    .services-grid{grid-template-columns:1fr 1fr;}
    .material-band{grid-template-columns:1fr 1fr;}
    .calc-wrap{grid-template-columns:1fr;}
    .calc-form{border-right:none;border-bottom:1px solid var(--line);}
    .field-row{grid-template-columns:1fr;}
    .testi-grid{grid-template-columns:1fr;}
    .gallery-grid{grid-template-columns:1fr 1fr;}
    .contact-grid{grid-template-columns:1fr;}
    .section{padding:64px 0;}
    .hero{padding-top:20px;}
  }
  @media (max-width: 520px){
    .services-grid{grid-template-columns:1fr;}
    .material-band{grid-template-columns:1fr;}
    .gallery-grid{grid-template-columns:1fr;}
    .ba-grid{grid-template-columns:1fr;}
    .footer-inner{flex-direction:column;align-items:flex-start;}
  }

  /* mobile nav drawer */
  .mobile-drawer{
    position:fixed;inset:0;background:var(--charcoal);z-index:200;
    display:flex;flex-direction:column;padding:26px 24px;
    transform:translateX(100%);transition:transform .25s ease;
  }
  .mobile-drawer.open{transform:translateX(0);}
  .mobile-drawer .close-x{align-self:flex-end;background:none;border:none;color:#fff;cursor:pointer;padding:8px;}
  .mobile-drawer nav{display:flex;flex-direction:column;gap:6px;margin-top:30px;}
  .mobile-drawer nav a{color:#fff;text-decoration:none;font-family:'Space Grotesk',sans-serif;font-size:24px;padding:12px 0;border-bottom:1px solid rgba(255,255,255,.08);}
  .mobile-drawer .foot{margin-top:auto;}
  .mobile-drawer .foot a{color:var(--amber);font-family:'IBM Plex Mono',monospace;font-size:16px;text-decoration:none;}

  @media (prefers-reduced-motion: reduce){
    html{scroll-behavior:auto;}
    *{transition:none !important;}
  }