/* Three Sons Heat and Air — industrial-warm, mobile-first */

:root{
  --ink:#0f1113;
  --ink-2:#171a1d;
  --ink-3:#23282c;
  --line:#e3ded8;
  --line-dark:#2c3237;
  --paper:#ffffff;
  --sand:#f6f3ef;
  --body:#3d4247;
  --body-dim:#6a7076;
  --ember:#d4a017;
  --ember-2:#b8860b;
  --ember-soft:#faf3e0;
  --cool:#1b263b;
  --cool-dim:#2c3e50;

  --wrap:1180px;
  --r:4px;
  --sec-y:clamp(56px,9vw,120px);
  --ease:cubic-bezier(.16,1,.3,1);
  --font:"Satoshi","Helvetica Neue",system-ui,-apple-system,"Segoe UI",Arial,sans-serif;
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%; scroll-behavior:smooth; scroll-padding-top:78px}
body{
  margin:0;
  font-family:var(--font);
  font-size:16px;
  line-height:1.6;
  color:var(--body);
  background:var(--paper);
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img{max-width:100%;height:auto;display:block}
a{color:inherit}
h1,h2,h3{color:var(--ink);margin:0;line-height:1.06;letter-spacing:-.025em;font-weight:900}
h1{font-size:clamp(2.05rem,6.4vw,4.1rem)}
h2{font-size:clamp(1.65rem,4.1vw,2.85rem)}
h3{font-size:1.125rem;line-height:1.25;letter-spacing:-.015em;font-weight:700}
p{margin:0 0 1em}
ul,ol{margin:0;padding:0;list-style:none}

.wrap{width:100%;max-width:var(--wrap);margin-inline:auto;padding-inline:20px}
@media(min-width:900px){.wrap{padding-inline:36px}}

.skip{position:absolute;left:-9999px;top:0;z-index:200;background:var(--ember);color:#fff;padding:12px 18px;font-weight:700}
.skip:focus{left:8px;top:8px}

:focus-visible{outline:3px solid var(--ember);outline-offset:3px;border-radius:2px}
.sec-dark :focus-visible,.hdr :focus-visible{outline-color:#e6b73e}

.eyebrow{
  font-size:.75rem;font-weight:700;letter-spacing:.16em;text-transform:uppercase;
  color:var(--ember);margin:0 0 14px;
}
.sec-dark .eyebrow{color:#e6b73e}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:9px;
  font-family:var(--font);font-size:.9375rem;font-weight:700;letter-spacing:-.01em;
  text-decoration:none;border:2px solid transparent;border-radius:var(--r);
  padding:13px 20px;min-height:48px;cursor:pointer;
  transition:transform .18s var(--ease),background-color .18s,color .18s,border-color .18s;
}
.btn:hover{transform:translateY(-1px)}
.btn:active{transform:translateY(0)}
.btn-lg{padding:16px 26px;min-height:56px;font-size:1rem}
.btn-block{width:100%}
.btn-call{background:var(--ember);color:#fff;border-color:var(--ember)}
.btn-call:hover{background:var(--ember-2);border-color:var(--ember-2)}
.btn-ghost{background:rgba(255,255,255,.09);color:#fff;border-color:rgba(255,255,255,.5);backdrop-filter:blur(6px)}
.btn-ghost:hover{background:#fff;color:var(--ink);border-color:#fff}
.btn-outline{background:transparent;color:var(--ink);border-color:var(--ink)}
.btn-outline:hover{background:var(--ink);color:#fff}

/* ---------- header ---------- */
.hdr{
  position:sticky;top:0;z-index:60;
  background:rgba(15,17,19,.92);
  backdrop-filter:blur(10px);
  border-bottom:1px solid rgba(255,255,255,.1);
}
.hdr-in{display:flex;align-items:center;gap:14px;min-height:64px}
.brand{display:inline-flex;align-items:center;gap:10px;text-decoration:none;flex:0 0 auto}
.brand-logo{height:36px;width:auto}
.brand-mark{display:inline-flex}
.brand-mark svg{width:30px;height:30px}
.brand-txt{display:flex;flex-direction:column;line-height:1}
.brand-txt strong{color:#fff;font-size:1.0625rem;font-weight:900;letter-spacing:-.03em}
.brand-txt em{
  font-style:normal;font-size:.625rem;font-weight:700;letter-spacing:.18em;
  text-transform:uppercase;color:#a2acb4;margin-top:3px;
}
.nav{display:none;margin-left:auto;gap:26px}
.nav a{
  color:#d6dce1;text-decoration:none;font-size:.875rem;font-weight:500;
  padding:6px 0;position:relative;transition:color .15s;
}
.nav a::after{content:"";position:absolute;left:0;right:100%;bottom:0;height:2px;background:var(--ember);transition:right .25s var(--ease)}
.nav a:hover{color:#fff}
.nav a:hover::after{right:0}
.hdr-call{margin-left:auto;padding:10px 16px;min-height:44px;font-size:.875rem;white-space:nowrap}
@media(min-width:1000px){
  .nav{display:flex}
  .hdr-call{margin-left:26px}
  .hdr-in{min-height:74px}
}
.menu-btn{
  margin-left:2px;width:44px;height:44px;display:grid;place-content:center;gap:5px;
  background:transparent;border:1px solid rgba(255,255,255,.24);border-radius:var(--r);cursor:pointer;
}
.menu-btn span{display:block;width:18px;height:2px;background:#fff;transition:transform .2s var(--ease),opacity .2s}
.menu-btn[aria-expanded="true"] span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.menu-btn[aria-expanded="true"] span:nth-child(2){opacity:0}
.menu-btn[aria-expanded="true"] span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
@media(min-width:1000px){.menu-btn{display:none}}
@media(max-width:400px){.hide-xs{display:none}.hdr-call{padding:10px 12px}}

.mnav{display:none;flex-direction:column;background:var(--ink-2);border-bottom:1px solid var(--line-dark)}
.mnav.open{display:flex}
.mnav a{
  color:#e7ebee;text-decoration:none;font-weight:600;font-size:1rem;
  padding:15px 20px;border-top:1px solid rgba(255,255,255,.07);
}
.mnav a:last-child{font-size:.875rem;color:#98a2aa;font-weight:500;word-break:break-all}
@media(min-width:1000px){.mnav{display:none !important}}

/* ---------- hero ---------- */
.hero{position:relative;background:var(--ink);overflow:hidden;isolation:isolate}
.hero-media{position:absolute;inset:0;z-index:-1}
.hero-media img{width:100%;height:100%;object-fit:cover;object-position:62% 50%;opacity:.42}
.hero-media::after{
  content:"";position:absolute;inset:0;
  background:linear-gradient(180deg,rgba(15,17,19,.86) 0%,rgba(15,17,19,.72) 45%,rgba(15,17,19,.95) 100%);
}
@media(min-width:800px){
  .hero-media img{opacity:.55;object-position:70% 50%}
  .hero-media::after{background:linear-gradient(95deg,rgba(15,17,19,.96) 0%,rgba(15,17,19,.86) 42%,rgba(15,17,19,.35) 100%)}
}
.hero-in{padding-top:clamp(48px,10vw,104px);padding-bottom:clamp(40px,7vw,88px)}
.hero h1{color:#fff;max-width:17ch;text-wrap:balance}
@media(min-width:800px){.hero h1{max-width:20ch}}
.hero .lede{
  color:#c8d0d6;font-size:1.0625rem;line-height:1.6;max-width:56ch;margin:22px 0 30px;
}
@media(min-width:800px){.hero .lede{font-size:1.1875rem}}
.hero-cta{display:flex;flex-wrap:wrap;gap:12px}
.hero-cta .btn{flex:1 1 auto}
@media(min-width:520px){.hero-cta .btn{flex:0 0 auto}}
.trust{
  display:flex;flex-wrap:wrap;gap:8px 0;margin-top:34px;padding-top:22px;
  border-top:1px solid rgba(255,255,255,.16);
}
.trust li{
  color:#aab4bb;font-size:.8125rem;font-weight:600;letter-spacing:.01em;
  padding:2px 14px 2px 0;margin-right:14px;position:relative;
}
.trust li:not(:last-child)::after{
  content:"";position:absolute;right:0;top:50%;transform:translateY(-50%);
  width:1px;height:13px;background:rgba(255,255,255,.24);
}
.trust li strong{color:#fff;font-weight:800}
@media(min-width:800px){.trust li{font-size:.875rem}}

/* ---------- sections ---------- */
.sec{padding:var(--sec-y) 0}
.sec-dark{background:var(--ink);color:#b9c1c8}
.sec-dark h2,.sec-dark h3{color:#fff}
.sec-warm{background:var(--sand);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.sec-head{max-width:60ch;margin-bottom:clamp(32px,4vw,56px)}
.sec-head h2{text-wrap:balance}
.sec-sub{margin-top:16px;font-size:1.0625rem;color:var(--body)}
.sec-dark .sec-sub{color:#a8b2b9}

/* ---------- service cards ---------- */
.cards{display:grid;gap:18px}
@media(min-width:760px){.cards{grid-template-columns:repeat(2,1fr);gap:22px}}
.card{
  position:relative;background:var(--paper);border:1px solid var(--line);
  border-radius:var(--r);padding:26px 22px 24px;
  transition:border-color .2s,box-shadow .25s var(--ease),transform .25s var(--ease);
}
.card:hover{border-color:#cfc7bd;box-shadow:0 14px 40px -22px rgba(15,17,19,.35);transform:translateY(-2px)}
.card::before{content:"";position:absolute;left:0;top:0;height:3px;width:100%;background:var(--ember);border-radius:var(--r) var(--r) 0 0}
.card:nth-child(3)::before,.card:nth-child(4)::before{background:var(--cool)}
.card-lead{background:var(--ink);border-color:var(--ink)}
.card-lead h3,.card-lead .card-num{color:#fff}
.card-lead p{color:#b7bfc6}
.card-lead .card-list li{color:#c5ccd2;border-color:rgba(255,255,255,.1)}
.card-lead .card-ic{color:#e6b73e;background:rgba(212,160,23,.16);border-color:rgba(212,160,23,.4)}
.card-lead .card-cta{color:#e6b73e}
@media(min-width:760px){.card-lead{grid-column:1 / -1;display:grid;grid-template-columns:1fr 1fr;gap:8px 40px;align-items:start}
  .card-lead .card-ic{grid-column:1}
  .card-lead h3{grid-column:1;font-size:1.5rem}
  .card-lead p{grid-column:1;margin-bottom:0}
  .card-lead .card-list{grid-column:2;grid-row:1 / span 4;margin-top:26px}
  .card-lead .card-num{top:8px}
  .card-lead .card-cta{grid-column:1}
}
.card-num{
  position:absolute;right:18px;top:16px;font-size:.75rem;font-weight:800;
  letter-spacing:.1em;color:#b9b2a8;
}
.card-ic{
  display:inline-grid;place-content:center;width:48px;height:48px;margin-bottom:16px;
  color:var(--ember);background:var(--ember-soft);border:1px solid #f0e6c8;border-radius:var(--r);
}
.card:nth-child(3) .card-ic,.card:nth-child(4) .card-ic{color:var(--cool);background:#e8edf2;border-color:#c8d4e0}
.card h3{margin-bottom:10px}
.card p{font-size:.9375rem;margin-bottom:16px}
.card-list{border-top:1px solid var(--line);padding-top:14px}
.card-list li{
  font-size:.875rem;line-height:1.45;padding:7px 0 7px 20px;position:relative;
  border-bottom:1px solid var(--line);
}
.card-list li:last-child{border-bottom:0}
.card-list li::before{
  content:"";position:absolute;left:2px;top:14px;width:7px;height:7px;
  border-right:2px solid var(--ember);border-bottom:2px solid var(--ember);transform:rotate(45deg);
}
.card:nth-child(3) .card-list li::before,.card:nth-child(4) .card-list li::before{border-color:var(--cool)}
.card-cta{
  display:inline-block;margin-top:16px;font-size:.875rem;font-weight:700;
  color:var(--ember);text-decoration:none;
}
.card-cta:hover{text-decoration:underline;text-underline-offset:3px}
.sec-dark .card-cta{color:#e6b73e}

/* ---------- why ---------- */
.why-grid{display:grid;gap:36px}
@media(min-width:900px){.why-grid{grid-template-columns:1.15fr .85fr;gap:64px;align-items:start}}
.why-items{display:grid;gap:2px}
.why-item{border-top:1px solid var(--line-dark);padding:22px 0}
.why-item:last-child{border-bottom:1px solid var(--line-dark)}
.why-item h3{margin-bottom:8px;font-size:1.1875rem}
.why-item p{font-size:.9375rem;color:#a3adb4;margin:0;max-width:56ch}
.why-fig{margin:0}
.why-fig img{border-radius:var(--r);width:100%}
.why-fig figcaption{
  margin-top:14px;font-size:.8125rem;color:#8e989f;border-left:2px solid var(--ember);padding-left:12px;
}
@media(min-width:900px){.why-fig{position:sticky;top:110px}}

/* ---------- owner-direct ---------- */
.direct{display:grid;gap:32px}
@media(min-width:900px){.direct{grid-template-columns:1.25fr .75fr;gap:56px;align-items:start}}
.direct-copy p{font-size:1rem;max-width:62ch}
.direct-cta{display:flex;flex-wrap:wrap;gap:12px;margin-top:26px}
.direct-cta .btn{flex:1 1 auto}
@media(min-width:520px){.direct-cta .btn{flex:0 0 auto}}
.direct-side{background:var(--paper);border:1px solid var(--line);border-radius:var(--r);padding:26px 22px}
.direct-side h3{margin-bottom:10px}
.direct-side p{font-size:.9375rem}
.direct-note{color:var(--body-dim);border-top:1px solid var(--line);padding-top:14px}
.rev{margin:0 0 18px;padding-bottom:18px;border-bottom:1px solid var(--line)}
.rev p{font-size:.9375rem;font-style:italic;color:var(--ink)}
.rev cite{font-size:.8125rem;font-style:normal;font-weight:700;color:var(--body-dim)}

/* ---------- service area ---------- */
.area-grid{display:grid;gap:30px}
@media(min-width:900px){.area-grid{grid-template-columns:1fr 1fr;gap:56px;align-items:center}}
.cities{display:grid;grid-template-columns:repeat(2,1fr);gap:1px;background:var(--line);border:1px solid var(--line);border-radius:var(--r);overflow:hidden}
@media(min-width:560px){.cities{grid-template-columns:repeat(3,1fr)}}
@media(min-width:900px){.cities{grid-template-columns:repeat(2,1fr)}}
.cities li{
  background:var(--paper);padding:16px 14px;font-weight:700;font-size:.9375rem;color:var(--ink);
  display:flex;align-items:center;gap:9px;transition:background-color .18s,color .18s;
}
.cities li::before{
  content:"";width:6px;height:6px;border-radius:50%;background:var(--ember);flex:0 0 auto;
}
.cities li:hover{background:var(--ink);color:#fff}
.cities li:last-child{grid-column:1 / -1}
.area-fig{margin:0}
.area-fig img{border-radius:var(--r);width:100%}
.area-fig figcaption{margin-top:12px;font-size:.8125rem;color:var(--body-dim)}

/* ---------- steps ---------- */
.steps{display:grid;gap:2px;counter-reset:s}
@media(min-width:800px){.steps{grid-template-columns:repeat(3,1fr);gap:1px;background:var(--line-dark)}}
.step{padding:26px 0;border-top:1px solid var(--line-dark)}
@media(min-width:800px){.step{background:var(--ink);padding:30px 26px 30px 0;border-top:2px solid var(--ember)}
  .step:nth-child(2){padding-left:26px}
  .step:nth-child(3){padding-left:26px}
}
.step-n{
  display:inline-grid;place-content:center;width:38px;height:38px;margin-bottom:16px;
  border-radius:50%;border:2px solid var(--ember);color:#fff;font-weight:900;font-size:1rem;
}
.step h3{margin-bottom:8px;font-size:1.1875rem}
.step p{font-size:.9375rem;color:#a3adb4;margin-bottom:8px}
.how-fig{margin:clamp(32px,5vw,56px) 0 0}
.how-fig img{width:100%;border-radius:var(--r)}

/* ---------- quote ---------- */
.sec-quote{background:var(--sand);border-top:1px solid var(--line)}
.quote-grid{display:grid;gap:30px}
@media(min-width:900px){.quote-grid{grid-template-columns:.9fr 1.1fr;gap:56px;align-items:start}}
.quote-copy p{max-width:52ch}
.quote-alt{font-weight:600;color:var(--ink)}
.quote-alt a{color:var(--ember);font-weight:800;text-decoration:none;border-bottom:2px solid rgba(212,160,23,.3)}
.quote-alt a:hover{border-color:var(--ember)}
.quote-facts{margin-top:26px;border-top:1px solid var(--line)}
.quote-facts li{
  display:flex;flex-wrap:wrap;gap:4px 14px;padding:12px 0;border-bottom:1px solid var(--line);
  font-size:.9375rem;color:var(--ink);font-weight:600;
}
.quote-facts li span{
  flex:0 0 84px;font-size:.6875rem;font-weight:800;letter-spacing:.14em;text-transform:uppercase;
  color:var(--body-dim);align-self:center;
}
.quote-facts a{color:var(--ink);text-decoration:none;word-break:break-word}
.quote-facts a:hover{color:var(--ember)}

.form-card{background:var(--paper);border:1px solid var(--line);border-radius:var(--r);padding:22px 20px 24px;box-shadow:0 20px 50px -34px rgba(15,17,19,.4)}
@media(min-width:600px){.form-card{padding:32px 30px}}
.f-row{display:grid;gap:0}
@media(min-width:560px){.f-row{grid-template-columns:1fr 1fr;gap:0 18px}}
.field{display:flex;flex-direction:column;margin-bottom:16px}
.field label{font-size:.75rem;font-weight:800;letter-spacing:.1em;text-transform:uppercase;color:var(--body-dim);margin-bottom:7px}
.field input,.field select,.field textarea{
  font-family:var(--font);font-size:1rem;color:var(--ink);background:#fbfaf9;
  border:1px solid #d8d2ca;border-radius:var(--r);padding:13px 14px;min-height:50px;width:100%;
  transition:border-color .16s,background-color .16s,box-shadow .16s;
}
.field textarea{min-height:104px;resize:vertical;line-height:1.5}
.field select{appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 12 8' fill='none'%3E%3Cpath d='M1 1.5 6 6.5l5-5' stroke='%233d4247' stroke-width='1.6' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat:no-repeat;background-position:right 14px center;background-size:12px;padding-right:38px}
.field input:focus,.field select:focus,.field textarea:focus{
  outline:none;background:#fff;border-color:var(--ember);box-shadow:0 0 0 3px rgba(212,160,23,.16);
}
.field input:user-invalid,.field select:user-invalid{border-color:#b8860b;background:#faf3e0}
.f-err{background:var(--ember-soft);border-left:3px solid var(--ember);color:#7a6308;font-size:.875rem;font-weight:600;padding:10px 12px;margin:0 0 14px}
.f-fine{font-size:.8125rem;color:var(--body-dim);margin:14px 0 0;text-align:center}
.f-fine a{color:var(--ember);font-weight:700;text-decoration:none}
.f-fine a:hover{text-decoration:underline}
.form-done{text-align:center;padding:14px 0 6px}
.done-ic{display:inline-grid;place-content:center;color:var(--ember);margin-bottom:14px}
.form-done h3{margin-bottom:10px;font-size:1.375rem}
.form-done p{font-size:.9375rem}
.form-done .btn{margin-top:6px}

/* ---------- footer ---------- */
.ftr{background:var(--ink);color:#98a2aa;padding-top:clamp(44px,6vw,72px)}
.ftr-in{display:grid;gap:32px;padding-bottom:36px}
@media(min-width:700px){.ftr-in{grid-template-columns:repeat(2,1fr)}}
@media(min-width:1000px){.ftr-in{grid-template-columns:1.3fr .8fr .9fr 1fr;gap:40px}}
.ftr-brand .brand{margin-bottom:16px}
.ftr-note{font-size:.9375rem;max-width:32ch;margin-bottom:10px}
.ftr-lic{font-size:.8125rem;margin:0}
.ftr-lic strong{color:#fff}
.ftr h2{font-size:.6875rem;font-weight:800;letter-spacing:.16em;text-transform:uppercase;color:#6e787f;margin-bottom:12px}
.ftr-h2-2{margin-top:24px}
.ftr-col ul li{font-size:.9375rem;padding:5px 0}
.ftr-col a{color:#cdd4d9;text-decoration:none;word-break:break-word}
.ftr-col a:hover{color:var(--ember);text-decoration:underline;text-underline-offset:3px}
.ftr-area p{font-size:.875rem;line-height:1.8;margin:0}
.ftr-bot{
  display:flex;flex-wrap:wrap;gap:8px 20px;justify-content:space-between;
  border-top:1px solid var(--line-dark);padding-top:18px;padding-bottom:22px;
}
.ftr-bot p{font-size:.75rem;margin:0}
.ftr-bot a{color:#98a2aa;text-decoration:none}
.ftr-bot a:hover{color:#fff}

/* ---------- mobile call bar ---------- */
.callbar{display:none}
@media(max-width:767px){
  body{padding-bottom:68px}
  .callbar{
    display:flex;align-items:center;justify-content:center;gap:10px;
    position:fixed;left:0;right:0;bottom:0;z-index:80;
    min-height:60px;padding:12px 16px calc(12px + env(safe-area-inset-bottom));
    background:var(--ember);color:#fff;font-weight:800;font-size:1.0625rem;
    text-decoration:none;letter-spacing:-.01em;
    box-shadow:0 -8px 24px -12px rgba(15,17,19,.55);
  }
  .callbar:active{background:var(--ember-2)}
  .ftr{padding-bottom:4px}
}

/* ---------- motion ---------- */
.reveal{opacity:0;transform:translateY(14px);transition:opacity .6s var(--ease),transform .6s var(--ease)}
.reveal.in{opacity:1;transform:none}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .reveal{opacity:1;transform:none;transition:none}
  .btn:hover,.card:hover{transform:none}
}