:root{
  --soot:#17120D;        /* carbonised deposit */
  --soot-2:#241C15;
  --grease:#C98A2E;      /* fresh deposit, amber */
  --grease-lt:#E8B65C;
  --steel:#6E7E8A;       /* clean duct metal */
  --steel-dk:#36434D;
  --paper:#FBFAF8;
  --paper-2:#F1EEE9;
  --ink:#1B1713;
  --ink-2:#5A5149;
  --line:#DED8D0;
  --max:1080px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}
  *{animation:none!important;transition:none!important}}
body{font-family:Archivo,"Helvetica Neue",Helvetica,Arial,sans-serif;
  font-size:17px;line-height:1.6;color:var(--ink);background:var(--paper);
  -webkit-font-smoothing:antialiased}
.wrap{max-width:var(--max);margin:0 auto;padding:0 20px}
a{color:var(--ink);text-decoration:underline;text-underline-offset:3px;
  text-decoration-thickness:1px;text-decoration-color:var(--grease)}
a:hover{text-decoration-thickness:2px}
:focus-visible{outline:3px solid var(--grease);outline-offset:2px}

h1,h2,h3{line-height:1.08;letter-spacing:-.035em;font-weight:800}
h1{font-size:clamp(2.1rem,7vw,3.5rem);margin-bottom:1rem}
h2{font-size:clamp(1.5rem,4vw,2.1rem);margin:3rem 0 1rem;letter-spacing:-.03em}
h3{font-size:1.15rem;margin:0 0 .4rem;letter-spacing:-.02em;font-weight:700}
p{margin-bottom:1.05rem;color:var(--ink-2);max-width:68ch}
p.lead{font-size:1.2rem;line-height:1.5;color:var(--ink);font-weight:500;max-width:60ch}

/* ---- masthead ---- */
header.top{background:var(--soot);position:sticky;top:0;z-index:50;
  border-bottom:1px solid rgba(201,138,46,.35)}
header.top .wrap{display:flex;align-items:center;justify-content:space-between;
  gap:14px;padding-top:13px;padding-bottom:13px;flex-wrap:wrap}
.brand{color:#fff;font-weight:800;font-size:1.15rem;letter-spacing:-.04em;
  text-decoration:none;line-height:1.1}
.brand em{display:block;font-style:normal;color:var(--grease-lt);font-size:.72rem;
  font-weight:500;letter-spacing:0;margin-top:2px}
nav{display:flex;gap:18px;flex-wrap:wrap}
nav a{color:#CFC6BB;font-size:.9rem;text-decoration:none}
nav a:hover{color:#fff;text-decoration:underline;text-underline-offset:4px}


/* ---- hero form layout ---- */
.hero-grid{display:grid;gap:34px;grid-template-columns:1fr}
@media(min-width:920px){.hero-grid{grid-template-columns:1fr 430px;gap:52px;align-items:start}}
.hero-copy h1{font-size:clamp(1.95rem,6vw,3rem);max-width:13ch}
.hero-points{list-style:none;margin-top:22px}
.hero-points li{color:#E4DCD2;font-size:.99rem;padding-left:24px;position:relative;margin-bottom:9px}
.hero-points li::before{content:"";position:absolute;left:0;top:10px;width:13px;height:2px;background:var(--grease)}

.quoteform{background:var(--paper);border-radius:4px;padding:26px 24px 22px;
  box-shadow:0 18px 50px rgba(0,0,0,.38);margin:0;max-width:none}
.quoteform h2{margin:0 0 .25rem;font-size:1.45rem;color:var(--ink)}
.quoteform .formsub{font-size:.94rem;margin-bottom:20px;color:var(--ink-2)}
.quoteform label{font-size:.84rem;margin-bottom:4px}
.quoteform input,.quoteform select{margin-bottom:14px;padding:11px 12px;font-size:1rem}
.quoteform .two{display:grid;gap:0 14px;grid-template-columns:1fr 1fr}
.btn-full{width:100%;text-align:center;margin-top:6px;font-size:1.05rem;padding:16px}
.formnote{font-size:.83rem;color:var(--ink-2);text-align:center;margin:12px 0 0}

/* ---- before / after ---- */
.ba{display:grid;gap:26px;grid-template-columns:1fr;margin:26px 0 8px}
@media(min-width:760px){.ba{grid-template-columns:1fr 1fr}}
.ba figure{background:var(--soot);border-radius:4px;padding:16px}
.ba figcaption{color:#9C9186;font-size:.88rem;margin-top:10px}
.ba figcaption strong{color:#fff}
.strip{background:var(--steel-dk);color:#fff;padding:38px 0}
.strip-grid{display:grid;gap:24px 30px;grid-template-columns:repeat(auto-fit,minmax(200px,1fr))}
.strip h3{color:#fff;font-size:1.02rem;padding-top:12px;border-top:2px solid var(--grease);margin-bottom:.3rem}
.strip p{color:#CBD4DA;font-size:.92rem;margin:0}
.col a{font-weight:600;white-space:nowrap}

/* ---- hero (inner pages) ---- */
.hero{background:var(--soot);color:#fff;padding:58px 0 64px;
  background-image:radial-gradient(120% 90% at 85% 0%,rgba(201,138,46,.17),transparent 60%)}
.hero h1{color:#fff;max-width:15ch}
.hero p{color:#C3B8AC;font-size:1.1rem;max-width:46ch}
.hero-grid{display:grid;gap:40px;grid-template-columns:1fr}
@media(min-width:900px){.hero-grid{grid-template-columns:1.05fr .95fr;
  align-items:center;gap:48px}}
.duct{width:100%;height:auto;display:block}
.duct figcaption{color:#9C9186;font-size:.84rem;margin-top:12px;max-width:40ch}

.btn{display:inline-block;background:var(--grease);color:var(--soot);
  font-weight:700;font-size:1.02rem;padding:15px 28px;border:0;cursor:pointer;
  text-decoration:none;border-radius:2px}
.btn:hover{background:var(--grease-lt);text-decoration:none}
.btn-row{display:flex;gap:14px;flex-wrap:wrap;align-items:center;margin-top:26px}
.btn-row a.quiet{color:#CFC6BB;font-size:.98rem;text-decoration-color:var(--grease)}

/* ---- sections ---- */
section{padding:56px 0}
section.tint{background:var(--paper-2);border-top:1px solid var(--line);
  border-bottom:1px solid var(--line)}
section > .wrap > h2:first-child{margin-top:0}

.cols{display:grid;gap:30px 36px;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));
  margin-top:28px}
.col h3{padding-top:14px;border-top:2px solid var(--soot)}
.col p{font-size:.97rem;margin-bottom:0}

ul.ticks{list-style:none;margin:18px 0;max-width:62ch}
ul.ticks li{padding-left:26px;position:relative;margin-bottom:9px;color:var(--ink-2)}
ul.ticks li::before{content:"";position:absolute;left:0;top:11px;width:12px;height:2px;
  background:var(--grease)}

.tablewrap{overflow-x:auto;margin:22px 0}
table{width:100%;border-collapse:collapse;font-size:.95rem;min-width:460px}
th,td{text-align:left;padding:13px 14px 13px 0;border-bottom:1px solid var(--line);
  vertical-align:top}
th{font-weight:700;color:var(--ink);border-bottom:2px solid var(--soot)}
td{color:var(--ink-2)}
td:last-child{color:var(--ink);font-weight:600;white-space:nowrap}

/* ---- steps (a real sequence) ---- */
ol.steps{list-style:none;counter-reset:s;margin-top:26px;display:grid;gap:26px;
  grid-template-columns:repeat(auto-fit,minmax(215px,1fr))}
ol.steps li{counter-increment:s;padding-top:40px;position:relative}
ol.steps li::before{content:"Step " counter(s);position:absolute;top:0;left:0;
  font-size:.8rem;font-weight:700;color:var(--grease);
  padding-bottom:7px;border-bottom:2px solid var(--grease);width:100%}
ol.steps h3{margin-bottom:.3rem}
ol.steps p{font-size:.95rem;margin-bottom:0}

.arealist{display:grid;gap:0;grid-template-columns:repeat(auto-fit,minmax(210px,1fr));
  margin-top:22px;border-top:1px solid var(--line)}
.arealist a{display:block;padding:14px 4px;border-bottom:1px solid var(--line);
  font-size:.97rem;font-weight:600;text-decoration:none}
.arealist a:hover{color:var(--grease);padding-left:8px}

/* ---- form ---- */
form{margin-top:26px;max-width:580px}
label{display:block;font-size:.9rem;font-weight:700;margin-bottom:5px;color:var(--ink)}
input,select,textarea{width:100%;padding:13px;border:1px solid var(--steel);
  border-radius:2px;font:inherit;font-size:1rem;margin-bottom:18px;
  background:#fff;color:var(--ink)}
textarea{min-height:110px;resize:vertical}
.hp{position:absolute;left:-9999px}

details{border-bottom:1px solid var(--line);padding:16px 0}
details summary{font-weight:700;cursor:pointer;color:var(--ink);font-size:1.02rem}
details summary::marker{color:var(--grease)}
details p{margin:12px 0 0}

/* ---- callout ---- */
.cta-band{background:var(--steel-dk);color:#fff;padding:52px 0}
.cta-band h2{color:#fff;margin:0 0 .6rem}
.cta-band p{color:#CBD4DA;margin-bottom:0}

footer{background:var(--soot);color:#9C9186;padding:46px 0;font-size:.9rem}
footer a{color:#CFC6BB;text-decoration:none}
footer a:hover{text-decoration:underline}
footer .fcols{display:grid;gap:26px;grid-template-columns:repeat(auto-fit,minmax(190px,1fr))}
footer h4{color:#fff;font-size:.95rem;margin-bottom:10px;letter-spacing:-.02em}
footer ul{list-style:none}
footer li{margin-bottom:7px}
.legal{border-top:1px solid #332A22;margin-top:30px;padding-top:18px;
  font-size:.8rem;line-height:1.6;max-width:80ch}