/* US Water Filtration Systems — design system
   Editorial serif headlines (Fraunces) + Inter body, deep teal/cyan "water" accent, no wave dividers. */

:root{
  --ink:#132025;
  --ink-soft:#4b6167;
  --paper:#fbfdfd;
  --paper-alt:#eaf5f5;
  --line:#d7e7e6;
  --brand-900:#0a3d42;
  --brand-700:#0d7377;
  --brand-600:#0f9aa8;
  --brand-500:#1cb5c2;
  --gold-500:#2fb6a3;
  --gold-100:#e1f5f0;
  --blue-deep:#0c2f3d;
  --white:#ffffff;
  --success:#2f7a4f;
  --radius:10px;
  --radius-lg:18px;
  --shadow:0 8px 24px -12px rgba(27,36,48,.18);
  --shadow-lg:0 20px 48px -20px rgba(27,36,48,.28);
  --maxw:1180px;
  --font-serif:'Fraunces', Georgia, 'Times New Roman', serif;
  --font-sans:'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;
  font-family:var(--font-sans);
  color:var(--ink);
  background:var(--paper);
  line-height:1.6;
  font-size:16px;
}
img{max-width:100%;display:block;height:auto}
a{color:inherit}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 20px}
h1,h2,h3,h4{font-family:var(--font-serif);font-weight:600;line-height:1.15;margin:0 0 .5em;color:var(--ink)}
h1{font-size:clamp(2rem,4.2vw,3rem);font-weight:600}
h2{font-size:clamp(1.5rem,2.8vw,2.15rem)}
h3{font-size:1.25rem}
p{margin:0 0 1em}
ul,ol{margin:0 0 1em;padding-left:1.2em}
.skip-link{position:absolute;left:-999px;top:0;background:var(--brand-700);color:#fff;padding:10px 16px;z-index:200}
.skip-link:focus{left:12px;top:12px}

/* ---------- Buttons ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;font-weight:600;font-size:.95rem;padding:13px 22px;border-radius:999px;text-decoration:none;border:2px solid transparent;transition:transform .15s ease,box-shadow .15s ease,background .15s ease;cursor:pointer}
.btn-primary{background:linear-gradient(135deg,var(--brand-600),var(--brand-700));color:#fff;box-shadow:var(--shadow)}
.btn-primary:hover{transform:translateY(-1px);box-shadow:var(--shadow-lg)}
.btn-outline{border-color:var(--ink);color:var(--ink);background:transparent}
.btn-outline:hover{background:var(--ink);color:#fff}
.btn-light{background:#fff;color:var(--brand-700)}
.btn-block{width:100%}
.btn-lg{padding:16px 28px;font-size:1.05rem}

/* ---------- Header ---------- */
.site-header{position:sticky;top:0;z-index:100;background:rgba(253,251,247,.96);backdrop-filter:blur(6px);border-bottom:1px solid var(--line)}
.header-inner{display:flex;align-items:center;gap:24px;padding:14px 20px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink)}
.brand-mark{color:var(--brand-600);flex:none}
.brand-word{font-family:var(--font-serif);font-weight:600;font-size:1.15rem;line-height:1.1;display:flex;flex-direction:column}
.brand-word-sub{font-family:var(--font-sans);font-weight:600;font-size:.62em;letter-spacing:.14em;text-transform:uppercase;color:var(--brand-600)}
.main-nav{margin-left:auto;display:none}
.main-nav>ul{display:flex;gap:6px;list-style:none;margin:0;padding:0}
.main-nav>ul>li{position:relative}
.nav-toggle-btn{display:flex;align-items:center;gap:6px;background:none;border:none;font:inherit;font-weight:500;font-size:.95rem;color:var(--ink);padding:10px 12px;cursor:pointer;border-radius:8px}
.main-nav>ul>li>a{display:block;padding:10px 12px;text-decoration:none;font-weight:500;font-size:.95rem;border-radius:8px}
.nav-toggle-btn:hover,.main-nav>ul>li>a:hover{background:var(--paper-alt)}
.dropdown{position:absolute;top:100%;left:0;background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow-lg);list-style:none;margin:6px 0 0;padding:8px;min-width:230px;opacity:0;visibility:hidden;transform:translateY(6px);transition:opacity .15s ease,transform .15s ease}
.dropdown-wide{min-width:260px;columns:2;column-gap:8px}
.has-menu:hover .dropdown,.has-menu:focus-within .dropdown{opacity:1;visibility:visible;transform:translateY(0)}
.dropdown li a{display:block;padding:8px 10px;border-radius:6px;text-decoration:none;font-size:.92rem;break-inside:avoid}
.dropdown li a:hover{background:var(--paper-alt)}
.header-cta{display:none;align-items:center;gap:14px;margin-left:12px}
.phone-link{display:flex;align-items:center;gap:6px;font-weight:600;text-decoration:none;color:var(--brand-700);white-space:nowrap}
.hamburger{margin-left:auto;display:flex;flex-direction:column;justify-content:center;gap:4px;width:38px;height:38px;background:none;border:1px solid var(--line);border-radius:8px}
.hamburger span{display:block;height:2px;background:var(--ink);margin:0 8px}
.mobile-nav{border-top:1px solid var(--line);background:#fff}
.mobile-nav ul{list-style:none;margin:0;padding:8px 12px 16px}
.mobile-nav a{display:block;padding:10px 6px;text-decoration:none;font-weight:500;border-bottom:1px solid var(--paper-alt)}
.mobile-group-label{padding:14px 6px 4px;font-size:.72rem;text-transform:uppercase;letter-spacing:.1em;color:var(--brand-600);font-weight:700}

@media(min-width:960px){
  .main-nav{display:block}
  .header-cta{display:flex}
  .hamburger{display:none}
  .mobile-nav{display:none !important}
}

.breadcrumb-bar{padding:10px 20px;font-size:.8rem;color:var(--ink-soft)}
.breadcrumb-bar ol{list-style:none;display:flex;flex-wrap:wrap;gap:6px;margin:0;padding:0}
.breadcrumb-bar li:not(:last-child)::after{content:"/";margin-left:6px;color:var(--line)}
.breadcrumb-bar a{text-decoration:none;color:var(--ink-soft)}
.breadcrumb-bar a:hover{color:var(--brand-700)}

/* ---------- Hero ---------- */
.hero{background:linear-gradient(160deg,var(--blue-deep) 0%,#134a5e 55%,var(--brand-700) 130%);color:#fff;padding:52px 0 60px;position:relative;overflow:hidden}
.hero::after{content:"";position:absolute;inset:0;background:radial-gradient(circle at 85% 20%,rgba(48,182,195,.28),transparent 55%)}
.hero .wrap{position:relative;display:grid;gap:34px;grid-template-columns:1fr}
.hero-eyebrow{display:inline-flex;align-items:center;gap:8px;background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.25);padding:6px 14px;border-radius:999px;font-size:.78rem;font-weight:600;letter-spacing:.05em;text-transform:uppercase;margin-bottom:16px}
.hero h1{color:#fff;max-width:16ch}
.hero-sub{font-size:1.1rem;color:rgba(255,255,255,.88);max-width:56ch;margin-bottom:22px}
.hero-cta-row{display:flex;flex-wrap:wrap;gap:12px;margin-bottom:22px}
.hero-points{display:flex;flex-wrap:wrap;gap:10px 22px;list-style:none;padding:0;margin:0;font-size:.9rem;color:rgba(255,255,255,.92)}
.hero-points li{display:flex;align-items:center;gap:7px}
.hero-points svg{flex:none;color:var(--gold-500)}
.hero-card{background:#fff;color:var(--ink);border-radius:var(--radius-lg);padding:26px;box-shadow:var(--shadow-lg)}
@media(min-width:900px){.hero .wrap{grid-template-columns:1.2fr .9fr;align-items:center}}

/* ---------- Sections ---------- */
section{padding:56px 0}
.section-alt{background:var(--paper-alt)}
.section-head{max-width:64ch;margin-bottom:32px}
.eyebrow{display:block;font-size:.78rem;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--brand-600);margin-bottom:10px}
.grid{display:grid;gap:22px}
.grid-2{grid-template-columns:1fr}
.grid-3{grid-template-columns:1fr}
.grid-4{grid-template-columns:1fr 1fr}
@media(min-width:720px){.grid-2{grid-template-columns:1fr 1fr}.grid-3{grid-template-columns:repeat(3,1fr)}}
@media(min-width:960px){.grid-4{grid-template-columns:repeat(4,1fr)}}

.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius-lg);padding:26px}
.card h3{margin-bottom:.4em}
.icon-badge{width:46px;height:46px;border-radius:12px;background:var(--gold-100);color:var(--brand-700);display:flex;align-items:center;justify-content:center;margin-bottom:14px}

.stat-row{display:flex;flex-wrap:wrap;gap:28px;margin:28px 0}
.stat{min-width:120px}
.stat b{display:block;font-family:var(--font-serif);font-size:2rem;color:var(--brand-700)}
.stat span{font-size:.85rem;color:var(--ink-soft)}

.data-table{width:100%;border-collapse:collapse;margin:18px 0;font-size:.94rem}
.data-table th,.data-table td{text-align:left;padding:10px 12px;border-bottom:1px solid var(--line)}
.data-table th{background:var(--paper-alt);font-weight:600}
.table-scroll{overflow-x:auto;border:1px solid var(--line);border-radius:var(--radius)}
.table-scroll .data-table{margin:0;border:none}

.source-note{font-size:.85rem;color:var(--ink-soft);border-left:3px solid var(--gold-500);padding:10px 14px;background:var(--paper-alt);border-radius:0 8px 8px 0;margin:18px 0}
.source-note a{color:var(--brand-700);text-decoration:underline}

.callout{background:var(--gold-100);border:1px solid #b9e3db;border-radius:var(--radius-lg);padding:24px}
.callout-dark{background:var(--blue-deep);color:#fff;border-radius:var(--radius-lg);padding:32px}
.callout-dark a.btn-primary{background:linear-gradient(135deg,var(--gold-500),var(--brand-600))}

.timeline{list-style:none;margin:0;padding:0;counter-reset:step}
.timeline li{counter-increment:step;position:relative;padding-left:52px;margin-bottom:22px}
.timeline li::before{content:counter(step);position:absolute;left:0;top:0;width:36px;height:36px;border-radius:50%;background:var(--brand-600);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:700;font-family:var(--font-serif)}

.faq-item{border-bottom:1px solid var(--line);padding:18px 0}
.faq-item h3{font-size:1.05rem;margin-bottom:8px}

.link-cluster{list-style:none;margin:0;padding:0;display:grid;gap:10px;grid-template-columns:1fr}
@media(min-width:700px){.link-cluster{grid-template-columns:1fr 1fr}}
.link-cluster a{display:block;background:#fff;border:1px solid var(--line);border-radius:10px;padding:14px 16px;text-decoration:none;font-weight:600}
.link-cluster a:hover{border-color:var(--brand-600);color:var(--brand-700)}
.link-cluster small{display:block;font-weight:400;color:var(--ink-soft);margin-top:2px}

.city-cluster-grid{display:grid;gap:14px;grid-template-columns:1fr}
@media(min-width:720px){.city-cluster-grid{grid-template-columns:repeat(3,1fr)}}
.city-chip{display:block;background:#fff;border:1px solid var(--line);border-radius:12px;padding:16px 18px;text-decoration:none}
.city-chip b{display:block;font-family:var(--font-serif);font-size:1.1rem}
.city-chip span{font-size:.85rem;color:var(--ink-soft)}

/* ---------- Forms ---------- */
.lead-form{background:#fff;border:1px solid var(--line);border-radius:var(--radius-lg);padding:26px;box-shadow:var(--shadow)}
.lead-form h3{margin-bottom:6px}
.lead-form .form-sub{color:var(--ink-soft);font-size:.9rem;margin-bottom:18px}
.field{margin-bottom:14px}
.field label{display:block;font-size:.85rem;font-weight:600;margin-bottom:6px}
.field input,.field select,.field textarea{width:100%;padding:11px 13px;border:1px solid var(--line);border-radius:8px;font:inherit;background:var(--paper)}
.field input:focus,.field select:focus,.field textarea:focus{outline:2px solid var(--brand-500);outline-offset:1px}
.field-row{display:grid;gap:14px;grid-template-columns:1fr}
@media(min-width:520px){.field-row{grid-template-columns:1fr 1fr}}
.form-disclaimer{font-size:.78rem;color:var(--ink-soft);margin-top:10px}

/* ---------- Sticky mobile CTA ---------- */
.sticky-cta{position:fixed;bottom:0;left:0;right:0;display:flex;z-index:90;box-shadow:0 -6px 18px rgba(0,0,0,.12)}
.sticky-btn{flex:1;display:flex;align-items:center;justify-content:center;gap:7px;padding:14px 10px;text-decoration:none;font-weight:700;font-size:.92rem}
.sticky-call{background:var(--blue-deep);color:#fff}
.sticky-form{background:linear-gradient(135deg,var(--brand-600),var(--gold-500));color:#fff}
body{padding-bottom:58px}
@media(min-width:960px){.sticky-cta{display:none}body{padding-bottom:0}}

/* ---------- Footer ---------- */
.site-footer{background:var(--ink);color:#d7dde5;margin-top:40px;padding-top:52px}
.footer-grid{display:grid;gap:32px;grid-template-columns:1fr}
@media(min-width:820px){.footer-grid{grid-template-columns:1.4fr 1fr 1fr 1fr}}
.footer-brand p{color:#aab3c0;font-size:.92rem}
.site-footer .brand{color:#fff}
.footer-phone a{color:var(--gold-500);font-weight:700;text-decoration:none;font-size:1.05rem}
.footer-hours{font-size:.85rem;color:#aab3c0}
.footer-col h3{color:#fff;font-size:.95rem;font-family:var(--font-sans);text-transform:uppercase;letter-spacing:.06em;margin-bottom:12px}
.footer-col-spacer{margin-top:22px}
.footer-col ul{list-style:none;margin:0;padding:0}
.footer-col li{margin-bottom:8px}
.footer-col a{color:#c3cad4;text-decoration:none;font-size:.92rem}
.footer-col a:hover{color:#fff}
.footer-disclosure{border-top:1px solid rgba(255,255,255,.12);margin-top:36px;padding:22px 20px;font-size:.8rem;color:#8f98a6}
.footer-bottom{display:flex;flex-wrap:wrap;gap:10px 20px;justify-content:space-between;padding:16px 20px 26px;font-size:.8rem;color:#8f98a6;border-top:1px solid rgba(255,255,255,.08)}
.footer-bottom a{color:#8f98a6;text-decoration:underline}

/* ---------- Utility ---------- */
.text-center{text-align:center}
.mt-0{margin-top:0}
.badge-row{display:flex;flex-wrap:wrap;gap:10px;margin:18px 0}
.badge{display:inline-flex;align-items:center;gap:6px;background:#fff;border:1px solid var(--line);border-radius:999px;padding:7px 14px;font-size:.82rem;font-weight:600}
.two-col{display:grid;gap:32px;grid-template-columns:1fr}
@media(min-width:900px){.two-col{grid-template-columns:1.3fr .9fr}}
.prose h2{margin-top:1.6em}
.prose h3{margin-top:1.3em}
.prose ul li,.prose ol li{margin-bottom:.4em}
.blog-list{display:grid;gap:20px;grid-template-columns:1fr}
@media(min-width:720px){.blog-list{grid-template-columns:1fr 1fr}}
.blog-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius-lg);padding:22px;text-decoration:none;display:block}
.blog-card .eyebrow{margin-bottom:8px}
.blog-card h3{color:var(--ink)}
.blog-card p{color:var(--ink-soft);font-size:.92rem;margin-bottom:0}

/* ---------- Savings calculator ---------- */
.calc-widget{background:#fff;border:1px solid var(--line);border-radius:var(--radius-lg);padding:28px;box-shadow:var(--shadow)}
.calc-form{display:grid;gap:16px;grid-template-columns:1fr;margin-bottom:6px}
@media(min-width:720px){.calc-form{grid-template-columns:1fr 1fr 1fr}}
.calc-result{background:var(--paper-alt);border:1px solid var(--line);border-radius:var(--radius);padding:18px 20px;margin-top:16px}
.calc-result p{margin:0 0 .8em}
.calc-result p:last-child{margin-bottom:0}

/* ---------- Illustrations ---------- */
.illo{width:100%;height:auto;max-width:420px;display:block;margin:0 auto}
.illo-wrap{display:flex;justify-content:center;padding:12px 0}