:root{
  --ink:#0b2030;
  --muted:#607484;
  --blue:#087ea4;
  --blue2:#19a7c9;
  --pale:#eaf8fb;
  --pale2:#f5fbfd;
  --line:#dcecf1;
  --white:#fff;
  --shadow:0 18px 50px rgba(8,63,83,.10);
  --radius:22px;
  --max:1180px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:var(--ink);background:#fff;line-height:1.65}
a{color:inherit}
.container{width:min(calc(100% - 40px),var(--max));margin:auto}
.site-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.94);backdrop-filter:blur(16px);border-bottom:1px solid rgba(220,236,241,.8)}
.nav{height:76px;display:flex;align-items:center;justify-content:space-between;gap:24px}
.logo{font-weight:800;text-decoration:none;letter-spacing:-.04em;font-size:1.15rem;display:flex;align-items:center;gap:9px}
.logo-mark{width:30px;height:30px;border-radius:50% 50% 50% 12px;background:linear-gradient(145deg,var(--blue2),var(--blue));transform:rotate(45deg);position:relative}
.logo-mark:after{content:"";position:absolute;width:9px;height:9px;background:white;border-radius:50%;top:6px;left:6px;opacity:.8}
.nav-links{display:flex;gap:20px;align-items:center;font-size:.92rem}
.nav-links a{text-decoration:none;color:#34515f}
.nav-links a:hover{color:var(--blue)}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:12px 18px;border-radius:999px;text-decoration:none;font-weight:750;border:1px solid transparent;transition:.2s}
.btn-primary{background:var(--blue);color:white;box-shadow:0 8px 20px rgba(8,126,164,.22)}
.btn-primary:hover{transform:translateY(-1px);background:#076d8e}
.btn-light{background:#fff;border-color:var(--line)}
.hero{background:radial-gradient(circle at 78% 15%,rgba(38,184,218,.30),transparent 30%),linear-gradient(135deg,#effcff 0%,#e4f7fb 45%,#f8fdfe 100%);padding:82px 0 76px;overflow:hidden}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:55px;align-items:center}
.eyebrow{text-transform:uppercase;letter-spacing:.14em;font-size:.76rem;font-weight:800;color:var(--blue)}
h1{font-size:clamp(2.45rem,6vw,4.8rem);line-height:1.02;letter-spacing:-.055em;margin:14px 0 22px}
h2{font-size:clamp(1.8rem,3vw,2.6rem);line-height:1.12;letter-spacing:-.035em;margin:0 0 14px}
h3{font-size:1.18rem;line-height:1.25;margin:0 0 8px}
.lead{font-size:1.18rem;color:#486271;max-width:650px}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:28px}
.hero-art{min-height:430px;border-radius:34px;position:relative;overflow:hidden;box-shadow:var(--shadow);background:
radial-gradient(circle at 45% 32%,rgba(255,255,255,.95) 0 9%,transparent 10%),
radial-gradient(circle at 63% 55%,rgba(255,255,255,.55) 0 4%,transparent 5%),
linear-gradient(160deg,#78d9ed 0%,#0c8caf 52%,#063f63 100%)}
.hero-art:before{content:"";position:absolute;inset:-20% -10%;background:radial-gradient(ellipse at 50% 65%,rgba(255,255,255,.55),transparent 34%);transform:rotate(-8deg)}
.hero-art:after{content:"WATER • FILTER • KNOWLEDGE";position:absolute;bottom:24px;left:26px;color:rgba(255,255,255,.9);font-size:.72rem;font-weight:800;letter-spacing:.18em}
.section{padding:78px 0}
.section.alt{background:var(--pale2)}
.section-head{max-width:760px;margin-bottom:32px}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:22px}
.card{background:white;border:1px solid var(--line);border-radius:var(--radius);padding:28px;box-shadow:0 8px 28px rgba(8,63,83,.05)}
.card:hover{box-shadow:var(--shadow)}
.card p{color:var(--muted);margin-bottom:0}
.card-link{text-decoration:none}
.icon{width:46px;height:46px;border-radius:15px;background:var(--pale);display:grid;place-items:center;color:var(--blue);font-size:1.25rem;margin-bottom:18px}
.pill{display:inline-block;padding:6px 10px;border-radius:999px;background:var(--pale);color:var(--blue);font-size:.75rem;font-weight:800}
.article-hero{padding:64px 0 45px;background:linear-gradient(135deg,#effcff,#f8fdfe)}
.article-hero .container{max-width:900px}
.article-hero h1{font-size:clamp(2.3rem,5vw,4rem)}
.meta{color:var(--muted);font-size:.9rem}
.article{max-width:820px;margin:auto;padding:45px 0 85px}
.article h2{margin-top:46px}
.article h3{margin-top:28px}
.article p,.article li{font-size:1.06rem;color:#2e4654}
.article ul,.article ol{padding-left:25px}
.callout{padding:24px 26px;border-radius:18px;background:var(--pale);border-left:4px solid var(--blue);margin:30px 0}
.table-wrap{overflow:auto;border:1px solid var(--line);border-radius:18px;margin:28px 0}
table{width:100%;border-collapse:collapse;min-width:620px;background:white}
th,td{text-align:left;padding:15px;border-bottom:1px solid var(--line);vertical-align:top}
th{background:#f3fafc;font-size:.86rem}
td{color:#385260}
.checklist{display:grid;gap:10px;margin:20px 0}
.check{display:flex;gap:10px;align-items:flex-start}
.check b{color:var(--blue)}
.quote{font-size:1.3rem;line-height:1.45;font-weight:650;color:#16465a;padding:24px 0}
.faq{border-top:1px solid var(--line)}
details{padding:17px 0;border-bottom:1px solid var(--line)}
summary{cursor:pointer;font-weight:750}
.footer{background:#062a3a;color:#d7edf3;padding:54px 0 25px}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:40px}
.footer a{color:#d7edf3;text-decoration:none}
.footer small{color:#8fb3bf}
.disclosure{font-size:.83rem;color:#78909c;margin-top:18px}
.breadcrumbs{font-size:.82rem;color:var(--muted);margin-bottom:18px}
.breadcrumbs a{text-decoration:none}
.cta{padding:46px;border-radius:30px;background:linear-gradient(135deg,#0a7ea2,#07506d);color:white}
.cta p{color:#d9f0f5}
.badges{display:flex;flex-wrap:wrap;gap:8px;margin:20px 0}
.badge{background:#fff;border:1px solid rgba(255,255,255,.4);padding:7px 11px;border-radius:999px;font-size:.78rem}
@media(max-width:900px){
  .hero-grid,.grid-3,.grid-2,.footer-grid{grid-template-columns:1fr}
  .nav-links{display:none}
  .hero{padding-top:55px}
  .hero-art{min-height:300px}
}