/* ==========================================================================
   Denver Water Heater Service Center — Design System
   Palette: Ink #16232E · Frost #EEF2F4 · Copper #C6702B · Steel #3C6E82 · Slate #5C6B72
   Type: Zilla Slab (display) + IBM Plex Sans (body)
   ========================================================================== */

:root{
  --ink:#16232E;
  --ink-2:#1E3040;
  --frost:#EEF2F4;
  --frost-2:#E3E9EB;
  --white:#FFFFFF;
  --copper:#C6702B;
  --copper-dark:#A15A20;
  --steel:#3C6E82;
  --steel-light:#7FA6B5;
  --slate:#5C6B72;
  --line:#D6DEE1;
  --font-display:'Zilla Slab', Georgia, serif;
  --font-body:'IBM Plex Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --maxw:1180px;
  --radius:3px;
}

*,*::before,*::after{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  font-family:var(--font-body);
  color:var(--ink);
  background:var(--frost);
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4{
  font-family:var(--font-display);
  font-weight:600;
  line-height:1.15;
  margin:0 0 .5em;
  color:var(--ink);
}
h1{font-size:clamp(2.1rem,4.5vw,3.4rem);}
h2{font-size:clamp(1.6rem,3vw,2.3rem);}
h3{font-size:1.3rem;}
p{margin:0 0 1.1em;max-width:68ch;}
a{color:var(--steel);text-decoration:none;}
a:hover{color:var(--copper);}
a:focus-visible,button:focus-visible,input:focus-visible,textarea:focus-visible{
  outline:3px solid var(--copper);outline-offset:2px;
}
ul,ol{padding-left:1.3em;margin:0 0 1.1em;}
li{margin-bottom:.45em;}
img{max-width:100%;display:block;}
.container{max-width:var(--maxw);margin:0 auto;padding:0 24px;}
.section{padding:64px 0;}
.section--tight{padding:40px 0;}
.section--ink{background:var(--ink);color:#DCE4E8;}
.section--ink h2,.section--ink h3{color:var(--white);}
.section--ink p{color:#B7C4CA;}
.section--white{background:var(--white);}
.eyebrow{
  font-family:var(--font-body);
  font-size:.8rem;
  font-weight:600;
  color:var(--copper);
  margin:0 0 .6em;
  letter-spacing:.02em;
}
.lede{font-size:1.15rem;color:var(--slate);max-width:62ch;}

/* Flow-line divider — the site's one recurring structural motif (a routed pipe/line
   that also marks section transitions, echoing water/gas line runs). */
.flow-divider{
  width:100%;height:34px;overflow:hidden;line-height:0;
}
.flow-divider svg{width:100%;height:100%;display:block;}

/* Header ---------------------------------------------------------------- */
.site-header{
  background:var(--ink);
  border-bottom:3px solid var(--copper);
  position:sticky;top:0;z-index:50;
}
.site-header__inner{
  max-width:var(--maxw);margin:0 auto;padding:14px 24px;
  display:flex;align-items:center;justify-content:space-between;gap:20px;
}
.brand{display:flex;align-items:center;gap:12px;color:var(--white);}
.brand__mark{flex:none;}
.brand__text{display:flex;flex-direction:column;line-height:1.15;}
.brand__name{font-family:var(--font-display);font-weight:600;font-size:1.08rem;color:var(--white);}
.brand__loc{font-size:.72rem;color:var(--steel-light);}
.brand:hover .brand__name{color:var(--white);}

.main-nav{display:flex;align-items:center;gap:26px;}
.main-nav a{color:#C9D4D8;font-size:.92rem;font-weight:500;}
.main-nav a:hover{color:var(--white);}
.main-nav__dropdown{position:relative;}
.main-nav__dropdown-panel{
  display:none;position:absolute;top:100%;left:-14px;padding-top:14px;min-width:280px;
}
.main-nav__dropdown:hover .main-nav__dropdown-panel,
.main-nav__dropdown:focus-within .main-nav__dropdown-panel{display:block;}
.main-nav__dropdown-inner{
  background:var(--white);border:1px solid var(--line);border-top:3px solid var(--copper);
  box-shadow:0 12px 24px rgba(0,0,0,.18);
  padding:10px;
}
.main-nav__dropdown-inner a{
  display:block;color:var(--ink);padding:9px 12px;font-size:.9rem;border-radius:var(--radius);
}
.main-nav__dropdown-inner a:hover{background:var(--frost);color:var(--copper-dark);}

.header-cta{display:flex;align-items:center;gap:16px;}
.header-phone{color:var(--white);font-weight:600;font-family:var(--font-display);font-size:1.05rem;white-space:nowrap;}
.header-phone span{display:block;font-family:var(--font-body);font-weight:400;font-size:.68rem;color:var(--steel-light);}

.nav-toggle{display:none;background:none;border:1px solid var(--steel);color:var(--white);padding:8px 10px;border-radius:var(--radius);}

.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:13px 26px;font-weight:600;font-size:.95rem;border-radius:var(--radius);
  border:2px solid transparent;cursor:pointer;white-space:nowrap;
}
.btn--copper{background:var(--copper);color:var(--white);}
.btn--copper:hover{background:var(--copper-dark);color:var(--white);}
.btn--outline{background:transparent;color:var(--white);border-color:var(--steel-light);}
.btn--outline:hover{border-color:var(--white);color:var(--white);}
.btn--ink{background:var(--ink);color:var(--white);}
.btn--ink:hover{background:var(--ink-2);color:var(--white);}
.btn--block{width:100%;}

/* Hero -------------------------------------------------------------------*/
.hero{
  background:var(--ink);
  color:var(--white);
  padding:72px 0 56px;
  position:relative;
}
.hero__grid{display:grid;grid-template-columns:1.15fr .85fr;gap:48px;align-items:center;}
.hero h1{color:var(--white);}
.hero .lede{color:#C4D0D4;}
.hero__badges{display:flex;flex-wrap:wrap;gap:10px 22px;margin:22px 0 28px;padding:0;list-style:none;}
.hero__badges li{
  display:flex;align-items:center;gap:8px;font-size:.86rem;color:#C9D4D8;margin:0;
}
.hero__badges svg{flex:none;color:var(--copper);}
.hero__ctas{display:flex;gap:14px;flex-wrap:wrap;}
.hero__panel{
  background:var(--ink-2);border:1px solid #2C4152;border-left:4px solid var(--copper);
  padding:28px;border-radius:var(--radius);
}
.hero__panel h3{color:var(--white);margin-bottom:.3em;}
.hero__panel p{color:#B7C4CA;font-size:.94rem;}
.hero__stat-row{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-top:18px;}
.hero__stat{border-top:1px solid #2C4152;padding-top:12px;}
.hero__stat b{display:block;font-family:var(--font-display);font-size:1.5rem;color:var(--copper);}
.hero__stat span{font-size:.78rem;color:#9FB0B7;}

/* Breadcrumb */
.breadcrumb{padding:16px 0;background:var(--frost-2);font-size:.85rem;color:var(--slate);}
.breadcrumb a{color:var(--steel);}
.breadcrumb ol{list-style:none;display:flex;flex-wrap:wrap;gap:6px;padding:0;margin:0;}
.breadcrumb li:not(:last-child)::after{content:"/";margin-left:6px;color:var(--slate);}

/* Service index / numbered menu ------------------------------------------ */
.service-menu{list-style:none;padding:0;margin:0;border-top:1px solid var(--line);}
.service-menu__item{
  border-bottom:1px solid var(--line);
  display:grid;grid-template-columns:64px 1fr auto;gap:20px;align-items:center;
  padding:22px 4px;
}
.service-menu__num{font-family:var(--font-display);font-size:1.5rem;color:var(--copper);}
.service-menu__item h3{margin:0 0 4px;font-size:1.15rem;}
.service-menu__item p{margin:0;font-size:.92rem;color:var(--slate);}
.service-menu__item a.arrow{font-weight:600;color:var(--steel);white-space:nowrap;}

/* Two-column feature row */
.split{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:start;}
.split--rev{direction:rtl;}
.split--rev>*{direction:ltr;}

/* Icon tiles */
.tile-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:2px;background:var(--line);border:1px solid var(--line);}
.tile{background:var(--white);padding:28px;}
.tile svg{color:var(--copper);margin-bottom:14px;}
.tile h3{font-size:1.05rem;margin-bottom:.35em;}
.tile p{font-size:.9rem;color:var(--slate);margin:0;}

/* Process steps */
.steps{list-style:none;margin:0;padding:0;counter-reset:step;}
.steps li{
  counter-increment:step;position:relative;padding:0 0 30px 56px;
  border-left:2px solid var(--line);margin-left:19px;
}
.steps li:last-child{border-color:transparent;padding-bottom:0;}
.steps li::before{
  content:counter(step);
  position:absolute;left:-20px;top:-2px;width:38px;height:38px;
  background:var(--ink);color:var(--white);border-radius:50%;
  display:flex;align-items:center;justify-content:center;
  font-family:var(--font-display);font-size:1rem;border:3px solid var(--frost);
}
.steps h3{margin-bottom:.25em;font-size:1.05rem;}
.steps p{margin:0;font-size:.92rem;color:var(--slate);}

/* Comparison / table */
.data-table{width:100%;border-collapse:collapse;font-size:.92rem;}
.data-table th,.data-table td{text-align:left;padding:12px 14px;border-bottom:1px solid var(--line);}
.data-table th{font-family:var(--font-display);font-weight:600;background:var(--frost-2);}
.data-table tr:last-child td{border-bottom:none;}

/* FAQ */
.faq{border-top:1px solid var(--line);}
.faq__item{border-bottom:1px solid var(--line);}
.faq__q{
  width:100%;text-align:left;background:none;border:none;cursor:pointer;
  padding:20px 4px;font-family:var(--font-display);font-size:1.05rem;color:var(--ink);
  display:flex;justify-content:space-between;align-items:center;gap:16px;
}
.faq__q .plus{flex:none;color:var(--copper);font-size:1.3rem;font-family:var(--font-body);transition:transform .15s;}
.faq__item[open] .plus{transform:rotate(45deg);}
.faq__a{padding:0 4px 22px;color:var(--slate);}
.faq__a p:last-child{margin-bottom:0;}

/* Areas grid */
.area-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;}
.area-card{
  background:var(--white);border:1px solid var(--line);border-left:4px solid var(--steel);
  padding:20px 22px;
}
.area-card h3{font-size:1.02rem;margin-bottom:.3em;}
.area-card p{font-size:.88rem;color:var(--slate);margin:0 0 .6em;}
.area-card a{font-size:.86rem;font-weight:600;}

/* Callout / CTA band */
.cta-band{
  background:var(--copper);color:var(--white);padding:44px 0;
}
.cta-band .container{display:flex;align-items:center;justify-content:space-between;gap:24px;flex-wrap:wrap;}
.cta-band h2{color:var(--white);margin-bottom:.2em;font-size:1.7rem;}
.cta-band p{color:#FCE8D8;margin:0;}
.cta-band .btn--outline{border-color:rgba(255,255,255,.6);color:var(--white);}
.cta-band .btn--outline:hover{background:var(--white);color:var(--copper-dark);border-color:var(--white);}

/* Testimonial */
.quote-block{
  background:var(--white);border:1px solid var(--line);border-top:3px solid var(--copper);
  padding:28px 30px;
}
.quote-block p{font-family:var(--font-display);font-size:1.15rem;color:var(--ink);margin-bottom:.6em;}
.quote-block cite{font-style:normal;font-size:.86rem;color:var(--slate);}

/* Forms */
.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px;}
.form-grid .full{grid-column:1 / -1;}
label{display:block;font-size:.85rem;font-weight:600;margin-bottom:6px;color:var(--ink);}
input,select,textarea{
  width:100%;padding:11px 13px;border:1px solid var(--line);border-radius:var(--radius);
  font-family:var(--font-body);font-size:.95rem;background:var(--white);color:var(--ink);
}
textarea{resize:vertical;min-height:120px;}
.field{margin-bottom:16px;}

/* Footer */
.site-footer{background:var(--ink);color:#AEBAC0;padding:56px 0 26px;}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:32px;margin-bottom:36px;}
.site-footer h4{color:var(--white);font-size:.95rem;font-family:var(--font-body);font-weight:600;margin-bottom:14px;}
.site-footer ul{list-style:none;padding:0;margin:0;}
.site-footer li{margin-bottom:8px;font-size:.88rem;}
.site-footer a{color:#AEBAC0;}
.site-footer a:hover{color:var(--copper);}
.footer-brand p{font-size:.88rem;color:#93A2A9;}
.footer-bottom{
  border-top:1px solid #29404F;padding-top:22px;
  display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;
  font-size:.78rem;color:#7E8E95;
}

/* Utility */
.mt-0{margin-top:0;}
.text-center{text-align:center;}
.list-check{list-style:none;padding:0;}
.list-check li{position:relative;padding-left:28px;}
.list-check li::before{
  content:"";position:absolute;left:0;top:.35em;width:14px;height:14px;
  border:2px solid var(--copper);border-top:none;border-right:none;
  transform:rotate(-45deg);
}
.skip-link{
  position:absolute;left:-999px;top:0;background:var(--copper);color:var(--white);
  padding:10px 16px;z-index:100;
}
.skip-link:focus{left:0;}

/* Responsive --------------------------------------------------------------*/
@media (max-width:920px){
  .main-nav,.header-cta .btn{display:none;}
  .nav-toggle{display:inline-flex;}
  .hero__grid,.split,.split--rev{grid-template-columns:1fr;}
  .split--rev{direction:ltr;}
  .footer-grid{grid-template-columns:1fr 1fr;}
  .tile-grid{grid-template-columns:1fr 1fr;}
  .area-grid{grid-template-columns:1fr 1fr;}
  .form-grid{grid-template-columns:1fr;}
  .service-menu__item{grid-template-columns:44px 1fr;}
  .service-menu__item a.arrow{grid-column:2;}
}
@media (max-width:600px){
  .footer-grid{grid-template-columns:1fr 1fr;}
  .tile-grid{grid-template-columns:1fr;}
  .area-grid{grid-template-columns:1fr;}
  .cta-band .container{flex-direction:column;align-items:flex-start;}
  .hero{padding:48px 0 40px;}
  .section{padding:44px 0;}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto;}
  *{animation-duration:.001ms !important;transition-duration:.001ms !important;}
}