:root{
    --bg: #FFFFFF;
    --bg-alt: #F5F7FA;
    --ink: #374151;
    --ink-soft: #6B7280;
    --teal-deep: #123B5D;
    --teal-deeper: #0C2C45;
    --mint: #2EA8FF;
    --mint-soft: #E6F4FF;
    --amber: #38A169;
    --amber-soft: #E3F5EA;
    --line: #E3E8EE;
    --white: #FFFFFF;
    --radius-lg: 20px;
    --radius-md: 12px;
    --shadow: 0 20px 50px -25px rgba(18, 59, 93, 0.3);
  }

  *{ box-sizing: border-box; }
  html{ scroll-behavior: smooth; }
  body{
    margin:0;
    background: var(--bg);
    color: var(--ink);
    font-family: 'Inter', sans-serif;
    -webkit-font-smoothing: antialiased;
    line-height: 1.55;
  }
  h1,h2,h3,h4{
    font-family: 'Space Grotesk', sans-serif;
    color: var(--teal-deeper);
    margin: 0;
    letter-spacing: -0.01em;
  }
  .mono{ font-family: 'IBM Plex Mono', monospace; }
  a{ color: inherit; text-decoration: none; }
  img{ max-width: 100%; display:block; }
  .wrap{
    max-width: 1180px;
    margin: 0 auto;
    padding: 0 32px;
  }
  section{ padding: 96px 0; }
  section.alt{ background: var(--bg-alt); }
  .eyebrow{
    font-family: 'IBM Plex Mono', monospace;
    font-size: 13px;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--mint);
    background: var(--teal-deeper);
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 14px 6px 10px;
    border-radius: 999px;
    margin-bottom: 20px;
  }
  .eyebrow::before{
    content:"";
    width: 7px; height: 7px;
    border-radius: 50%;
    background: var(--mint);
    box-shadow: 0 0 0 4px rgba(46,168,255,0.25);
  }

  /* ---------- Header ---------- */
  header{
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(255,255,255,0.9);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--line);
  }
  .nav{
    display:flex;
    align-items:center;
    justify-content: space-between;
    padding: 18px 0;
  }
  .brand{
    display:flex;
    align-items:center;
    gap: 12px;
    font-family:'Space Grotesk', sans-serif;
    font-weight:600;
    font-size: 17px;
    color: var(--teal-deeper);
  }
  .brand-mark{
    width: 38px; height:38px;
    border-radius: 10px;
    background: linear-gradient(145deg, var(--teal-deep), var(--teal-deeper));
    display:flex; align-items:center; justify-content:center;
    flex-shrink:0;
  }
  .brand-name-line2{
    display:block;
    font-family:'Inter',sans-serif;
    font-weight:400;
    font-size: 12.5px;
    color: var(--ink-soft);
  }
  nav.links{
    display:flex;
    gap: 32px;
    font-size: 14.5px;
    font-weight: 500;
    color: var(--teal-deeper);
  }
  nav.links a{ opacity:0.8; transition:opacity .2s; }
  nav.links a:hover{ opacity:1; }
  .header-actions{
    display:flex;
    align-items:center;
    gap: 18px;
  }
  .phone-link{
    font-family:'IBM Plex Mono', monospace;
    font-weight: 600;
    font-size: 15px;
    color: var(--teal-deeper);
    display:none;
  }
  .btn{
    display:inline-flex;
    align-items:center;
    gap:8px;
    padding: 12px 22px;
    border-radius: 999px;
    font-weight: 600;
    font-size: 14.5px;
    cursor:pointer;
    border: none;
    transition: transform .18s ease, box-shadow .18s ease;
  }
  .btn-primary{
    background: var(--amber);
    color: var(--white);
  }
  .btn-primary:hover{ transform: translateY(-2px); box-shadow: 0 12px 24px -12px rgba(56,161,105,0.55); background: #2F855A; }
  .btn-ghost{
    background: transparent;
    border: 1.5px solid var(--amber);
    color: var(--amber);
  }
  .btn-ghost:hover{ background: var(--amber); color:var(--white); }

  /* ---------- Hero ---------- */
  .hero{
    padding: 88px 0 60px;
    position: relative;
    overflow: hidden;
  }
  .hero-grid{
    display:grid;
    grid-template-columns: 1.05fr 0.95fr;
    gap: 56px;
    align-items:center;
  }
  .hero h1{
    font-size: clamp(34px, 4.4vw, 52px);
    line-height: 1.08;
    margin-bottom: 22px;
  }
  .hero h1 span{ color: var(--mint); }
  .hero p.lead{
    font-size: 17.5px;
    color: var(--ink-soft);
    max-width: 46ch;
    margin-bottom: 32px;
  }
  .hero-actions{
    display:flex;
    gap: 16px;
    flex-wrap: wrap;
    margin-bottom: 34px;
  }
  .hero-stats{
    display:flex;
    gap: 34px;
    flex-wrap: wrap;
  }
  .hstat b{
    display:block;
    font-family:'Space Grotesk',sans-serif;
    font-size: 24px;
    color: var(--teal-deeper);
  }
  .hstat span{
    font-size: 13px;
    color: var(--ink-soft);
  }

  /* Airflow diagram */
  .diagram-card{
    background: linear-gradient(160deg, #123B5D, #0C2C45);
    border-radius: var(--radius-lg);
    padding: 32px;
    box-shadow: var(--shadow);
    position: relative;
  }
  .diagram-card .cap{
    display:flex;
    justify-content: space-between;
    font-family:'IBM Plex Mono', monospace;
    font-size: 11.5px;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: rgba(255,255,255,0.72);
    margin-bottom: 18px;
  }
  .flow-line{
    stroke-dasharray: 10 8;
    animation: dash 1.4s linear infinite;
  }
  .flow-line.reverse{ animation-direction: reverse; }
  @keyframes dash{ to{ stroke-dashoffset: -36; } }
  .fan-group{
    transform-box: fill-box;
    transform-origin: center;
    animation: spin 1.8s linear infinite;
  }
  @keyframes spin{ to{ transform: rotate(360deg); } }
  .diagram-legend{
    display:flex;
    gap: 22px;
    margin-top: 18px;
    font-size: 13px;
    color: rgba(255,255,255,0.75);
  }
  .diagram-legend span{ display:flex; align-items:center; gap:8px; }
  .dot{ width:10px; height:10px; border-radius:3px; }

  /* ---------- Services ---------- */
  .section-head{
    max-width: 620px;
    margin-bottom: 52px;
  }
  .section-head h2{
    font-size: clamp(28px, 3vw, 38px);
    margin-bottom: 14px;
  }
  .section-head p{
    color: var(--ink-soft);
    font-size: 16px;
  }
  .services-grid{
    display:grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 22px;
  }
  .service-card{
    background: var(--white);
    border: 1px solid var(--line);
    border-radius: var(--radius-md);
    padding: 30px 26px;
    transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease;
  }
  .service-card:hover{
    transform: translateY(-4px);
    box-shadow: var(--shadow);
    border-color: transparent;
  }
  .service-icon{
    width: 46px; height:46px;
    border-radius: 12px;
    background: var(--mint-soft);
    display:flex; align-items:center; justify-content:center;
    margin-bottom: 18px;
  }
  .service-card h3{
    font-size: 18px;
    margin-bottom: 10px;
  }
  .service-card p{
    font-size: 14.5px;
    color: var(--ink-soft);
    margin:0;
  }

  /* ---------- Process ---------- */
  .process{
    background: var(--teal-deeper);
    border-radius: 28px;
    padding: 72px 56px;
    color: var(--white);
  }
  .process .section-head h2, .process .section-head p{ color: var(--white); }
  .process .section-head p{ color: rgba(255,255,255,0.82); }
  .steps{
    display:grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0;
    position: relative;
  }
  .step{
    position: relative;
    padding-right: 24px;
  }
  .step:not(:last-child)::after{
    content:"";
    position:absolute;
    top: 22px;
    right: 0;
    width: 24px;
    height: 1px;
    background: rgba(255,255,255,0.25);
  }
  .step-index{
    font-family:'IBM Plex Mono', monospace;
    color: var(--mint);
    font-size: 13px;
    margin-bottom: 14px;
    display:block;
  }
  .step h4{
    color: var(--white);
    font-size: 18px;
    margin-bottom: 10px;
  }
  .step p{
    color: rgba(255,255,255,0.82);
    font-size: 14px;
    margin:0;
  }

  /* ---------- Coverage ---------- */
  .coverage-grid{
    display:grid;
    grid-template-columns: 0.95fr 1.05fr;
    gap: 56px;
    align-items:center;
  }
  .map-card{
    background: var(--white);
    border: 1px solid var(--line);
    border-radius: var(--radius-lg);
    padding: 20px;
    box-shadow: var(--shadow);
  }
  .ring{
    stroke: var(--mint);
    fill: none;
    stroke-width: 1;
    opacity: 0.5;
  }
  .town-list{
    display:grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 10px 24px;
    margin-top: 24px;
  }
  .town-list li{
    list-style: none;
    font-size: 14.5px;
    color: var(--ink-soft);
    display:flex;
    align-items:center;
    gap: 10px;
  }
  .town-list li::before{
    content:"";
    width:6px; height:6px;
    border-radius:50%;
    background: var(--amber);
    flex-shrink:0;
  }

  /* ---------- Why us ---------- */
  .why-grid{
    display:grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
  }
  .section-decor{
    position: relative;
    overflow: hidden;
  }
  .bg-decor{
    position: absolute;
    top: 0;
    right: -40px;
    width: 480px;
    max-width: 55vw;
    opacity: 0.05;
    pointer-events: none;
    z-index: 0;
  }
  .section-decor .wrap{ position: relative; z-index: 1; }
  .why-card{
    padding: 8px 0;
  }
  .why-num{
    font-family:'Space Grotesk', sans-serif;
    font-size: 30px;
    color: var(--mint);
    margin-bottom: 12px;
  }
  .why-card h4{ font-size: 16.5px; margin-bottom: 8px; }
  .why-card p{ font-size: 14px; color: var(--ink-soft); margin:0; }

  /* ---------- Contact ---------- */
  .contact-card{
    background: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    display:grid;
    grid-template-columns: 1fr 1fr;
    overflow:hidden;
  }
  .contact-info{
    background: linear-gradient(160deg, var(--teal-deep), var(--teal-deeper));
    color: var(--white);
    padding: 52px 44px;
  }
  .contact-info h3{ color:var(--white); font-size: 26px; margin-bottom: 14px; }
  .contact-info p{ color: rgba(255,255,255,0.72); font-size: 15px; margin-bottom: 32px; }
  .contact-row{
    display:flex;
    align-items:center;
    gap: 14px;
    margin-bottom: 20px;
    font-size: 15px;
  }
  .contact-row .icn{
    width: 36px; height:36px;
    border-radius: 10px;
    background: rgba(255,255,255,0.1);
    display:flex; align-items:center; justify-content:center;
    flex-shrink:0;
  }
  .contact-form{
    padding: 52px 44px;
    display:flex;
    flex-direction: column;
    gap: 16px;
  }
  .field label{
    display:block;
    font-size: 13px;
    font-weight: 600;
    color: var(--teal-deeper);
    margin-bottom: 6px;
  }
  .field input, .field textarea, .field select{
    width:100%;
    border: 1.5px solid var(--line);
    border-radius: 10px;
    padding: 12px 14px;
    font-family:'Inter',sans-serif;
    font-size: 14.5px;
    background: var(--bg-alt);
    color: var(--ink);
    resize: vertical;
  }
  .field input:focus, .field textarea:focus, .field select:focus{
    outline: none;
    border-color: var(--mint);
    background: var(--white);
  }
  .row2{ display:grid; grid-template-columns: 1fr 1fr; gap: 16px; }

  /* ---------- Footer ---------- */
  footer{
    border-top: 1px solid var(--line);
    padding: 40px 0;
  }
  .footer-row{
    display:flex;
    justify-content: space-between;
    align-items:center;
    flex-wrap: wrap;
    gap: 16px;
    font-size: 13.5px;
    color: var(--ink-soft);
  }

  /* ---------- Reveal on scroll ---------- */
  .reveal{
    opacity: 0;
    transform: translateY(18px);
    transition: opacity .6s ease, transform .6s ease;
  }
  .reveal.in{ opacity: 1; transform: none; }

  @media (max-width: 980px){
    .hero-grid, .coverage-grid, .contact-card{ grid-template-columns: 1fr; }
    .services-grid{ grid-template-columns: repeat(2, 1fr); }
    .steps{ grid-template-columns: repeat(2, 1fr); row-gap: 32px; }
    .step:not(:last-child)::after{ display:none; }
    .why-grid{ grid-template-columns: repeat(2, 1fr); }
    nav.links{ display:none; }
    .process{ padding: 48px 28px; }
  }
  @media (min-width: 900px){
    .phone-link{ display:inline-flex; align-items:center; gap:6px; }
  }
  @media (max-width: 600px){
    section{ padding: 64px 0; }
    .wrap{ padding: 0 20px; }
    .services-grid{ grid-template-columns: 1fr; }
    .why-grid{ grid-template-columns: 1fr; }
    .row2{ grid-template-columns: 1fr; }
    .contact-info, .contact-form{ padding: 36px 26px; }
  }

  @media (prefers-reduced-motion: reduce){
    .flow-line{ animation: none; }
    .reveal{ transition: none; opacity:1; transform:none; }
  }