/* Well Water Filtration Systems — design tokens */
:root{
  --mineral:#EEF2EF;      /* page: pale limestone */
  --paper:#FFFFFF;
  --aquifer:#12355B;      /* deep groundwater blue: headings, header */
  --ink:#1D2733;          /* body text */
  --casing:#55616D;       /* steel well casing: secondary text, rules */
  --rule:#C9D2D3;
  --teal:#0B6E6C;         /* action color: CTAs, links */
  --teal-dark:#08504F;
  --iron:#9C3D1B;         /* iron oxide: warnings only */
  --silt:#D9CFB8;         /* soil strata */
  --sand:#E6DDC6;
  --clay:#B9A98A;
  --water:#3E7FB0;
  --font-ui:"Archivo",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-body:"Source Serif 4",Georgia,"Times New Roman",serif;
  --measure:68ch;
  --r-sm:4px; --r-md:10px;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--mineral);color:var(--ink);font-family:var(--font-body);font-size:1.125rem;line-height:1.65}
img,svg{max-width:100%;height:auto}
a{color:var(--teal);text-underline-offset:.18em}
a:hover{color:var(--teal-dark)}
:focus-visible{outline:3px solid #F2B705;outline-offset:2px;border-radius:2px}
.skip{position:absolute;left:-999px;top:0;background:var(--aquifer);color:#fff;padding:.5rem 1rem;z-index:10}
.skip:focus{left:0}

h1,h2,h3,h4{font-family:var(--font-ui);color:var(--aquifer);line-height:1.15;font-stretch:112%;letter-spacing:-.01em}
h1{font-size:clamp(2rem,4.6vw,3.1rem);font-weight:800;margin:.2em 0 .45em}
h2{font-size:clamp(1.45rem,2.6vw,1.9rem);font-weight:750;margin:2.2em 0 .6em}
h3{font-size:1.2rem;font-weight:700;margin:1.6em 0 .4em}
p,ul,ol{margin:0 0 1.05em}
li{margin:.25em 0}
small,.meta{font-family:var(--font-ui);font-size:.85rem;color:var(--casing)}

/* Header */
.site-header{background:var(--aquifer);color:#fff}
.site-header .wrap{display:flex;align-items:center;justify-content:space-between;gap:1rem;padding:.8rem 1.25rem;max-width:1180px;margin:0 auto;flex-wrap:wrap}
.brand{display:flex;align-items:center;gap:.6rem;color:#fff;text-decoration:none;font-family:var(--font-ui);font-weight:800;font-stretch:118%;font-size:1.05rem;letter-spacing:-.01em}
.brand:hover{color:#fff}
.brand svg{width:30px;height:30px}
.nav{display:flex;gap:1.1rem;flex-wrap:wrap;font-family:var(--font-ui);font-size:.95rem}
.nav a{color:#DCE7F2;text-decoration:none;padding:.3rem 0}
.nav a:hover,.nav a[aria-current=page]{color:#fff;text-decoration:underline}
.nav .nav-cta{background:#fff;color:var(--aquifer);padding:.35rem .8rem;border-radius:var(--r-sm);font-weight:700}
.nav .nav-cta:hover{color:var(--aquifer);text-decoration:none;background:#E3F1F0}

/* Layout */
.wrap{max-width:1180px;margin:0 auto;padding:0 1.25rem}
.article{display:grid;grid-template-columns:minmax(0,var(--measure)) 300px;gap:3.5rem;justify-content:center;align-items:start;padding:1.5rem 1.25rem 4rem;max-width:1180px;margin:0 auto}
.article main{min-width:0}
.rail{position:sticky;top:1.25rem}
@media (max-width:980px){.article{grid-template-columns:1fr;gap:2rem}.rail{position:static}}
.breadcrumb{font-family:var(--font-ui);font-size:.85rem;color:var(--casing);margin:.6rem 0 0}
.breadcrumb ol{list-style:none;padding:0;margin:0;display:flex;flex-wrap:wrap;gap:.35rem}
.breadcrumb li+li::before{content:"/";margin-right:.35rem;color:var(--rule)}
.breadcrumb a{color:var(--casing)}
.byline{font-family:var(--font-ui);font-size:.88rem;color:var(--casing);margin:-.2em 0 1.4em}
.byline a{color:var(--casing)}
.disclosure{font-family:var(--font-ui);font-size:.82rem;color:var(--casing);border-left:3px solid var(--rule);padding:.2rem 0 .2rem .8rem;margin:0 0 1.6rem}

/* Short answer */
.answer{background:var(--paper);border:1px solid var(--rule);border-left:6px solid var(--aquifer);border-radius:var(--r-sm);padding:1.1rem 1.3rem;margin:0 0 1.8rem}
.answer h2{margin:0 0 .35em;font-size:1.05rem;font-stretch:100%;color:var(--casing);font-weight:700}
.answer p:last-child{margin:0}

/* Picks: ranked list rows, not cards */
.picks{list-style:none;padding:0;margin:0 0 1.5rem;border-top:2px solid var(--aquifer)}
.pick{display:grid;grid-template-columns:1fr auto;gap:.4rem 1.5rem;padding:1.1rem 0;border-bottom:1px solid var(--rule)}
.pick h3{margin:0;font-size:1.15rem}
.pick .role{font-family:var(--font-ui);font-size:.85rem;color:var(--teal-dark);font-weight:700;margin:0 0 .15rem}
.pick .why{grid-column:1;margin:.2rem 0 0;font-size:1rem}
.pick .specs{grid-column:1;display:flex;flex-wrap:wrap;gap:.3rem .9rem;font-family:var(--font-ui);font-size:.85rem;color:var(--casing);margin:.35rem 0 0;padding:0;list-style:none}
.pick .specs li{margin:0}
.pick .buy{grid-column:2;grid-row:1 / span 4;align-self:center;text-align:right}
.price{display:block;font-family:var(--font-ui);font-weight:800;font-size:1.15rem;color:var(--aquifer)}
.price small{display:block;font-weight:500;font-size:.75rem}
@media (max-width:620px){.pick{grid-template-columns:1fr}.pick .buy{grid-column:1;grid-row:auto;text-align:left;margin-top:.6rem}}

.btn{display:inline-block;font-family:var(--font-ui);font-weight:700;font-size:1rem;background:var(--teal);color:#fff;text-decoration:none;padding:.7rem 1.15rem;border-radius:var(--r-sm);border:0;cursor:pointer;line-height:1.2;margin-top:.45rem}
.btn:hover{background:var(--teal-dark);color:#fff}
.btn.secondary{background:transparent;color:var(--teal);box-shadow:inset 0 0 0 2px var(--teal)}
.btn.secondary:hover{background:#E3F1F0;color:var(--teal-dark)}

/* Tables */
.table-wrap{overflow-x:auto;margin:0 0 1.6rem;border:1px solid var(--rule);border-radius:var(--r-sm);background:var(--paper)}
table{border-collapse:collapse;width:100%;font-family:var(--font-ui);font-size:.92rem;line-height:1.45}
th,td{text-align:left;padding:.65rem .8rem;border-bottom:1px solid var(--rule);vertical-align:top}
thead th{background:#E4EAEC;color:var(--aquifer);font-weight:700}
tbody tr:last-child td{border-bottom:0}

/* Notes */
.warn{border-left:6px solid var(--iron);background:#FBF1EC;padding:.9rem 1.2rem;border-radius:var(--r-sm);margin:0 0 1.5rem}
.warn strong{color:var(--iron)}
.note{border-left:6px solid var(--casing);background:var(--paper);padding:.9rem 1.2rem;border-radius:var(--r-sm);margin:0 0 1.5rem}

/* FAQ */
.faq details{border-bottom:1px solid var(--rule);padding:.75rem 0}
.faq summary{font-family:var(--font-ui);font-weight:700;color:var(--aquifer);cursor:pointer;font-size:1.02rem}
.faq details p{margin:.6rem 0 0}
.sources{font-size:.92rem}
.sources li{margin:.3rem 0}

/* Rail */
.rail-box{background:var(--paper);border:1px solid var(--rule);border-radius:var(--r-md);padding:1.1rem 1.2rem;margin-bottom:1.2rem}
.rail-box h2{font-size:1.05rem;margin:0 0 .5rem}
.rail-box p{font-size:.98rem}
.rail-box ul{padding-left:1.1rem;font-size:.98rem}
.rail-pick{font-family:var(--font-ui)}
.rail-pick strong{display:block;color:var(--aquifer);font-size:1.02rem}

/* Sticky mobile CTA */
.mobile-cta{display:none}
@media (max-width:980px){
  .mobile-cta{display:flex;position:fixed;left:0;right:0;bottom:0;z-index:5;background:var(--aquifer);color:#fff;padding:.6rem 1rem;gap:.8rem;align-items:center;justify-content:space-between;font-family:var(--font-ui);font-size:.9rem;box-shadow:0 -2px 10px rgba(18,53,91,.25)}
  .mobile-cta .btn{margin:0;padding:.55rem .9rem;background:#fff;color:var(--aquifer)}
  body.has-cta{padding-bottom:4.2rem}
}

/* Home hero: well cross-section */
.hero{background:var(--aquifer);color:#fff;overflow:hidden}
.hero .wrap{display:grid;grid-template-columns:minmax(0,1.05fr) minmax(0,.95fr);gap:2.5rem;align-items:center;padding-top:2.6rem;padding-bottom:0}
.hero h1{color:#fff;font-size:clamp(2.1rem,4.8vw,3.4rem);margin-top:0}
.hero p.lede{font-size:1.2rem;color:#DCE7F2;max-width:36ch}
.hero .section-svg{align-self:end;display:block}
@media (max-width:860px){.hero .wrap{grid-template-columns:1fr}.hero .section-svg{max-width:420px;margin:0 auto}}

.symptoms{background:var(--paper);color:var(--ink);border-radius:var(--r-md);padding:1.2rem 1.3rem 1.3rem;margin:1.4rem 0 2.6rem;max-width:560px}
.symptoms fieldset{border:0;padding:0;margin:0}
.symptoms legend{font-family:var(--font-ui);font-weight:800;color:var(--aquifer);font-size:1.15rem;margin-bottom:.6rem;font-stretch:110%}
.symptom-list{display:grid;grid-template-columns:1fr 1fr;gap:.35rem .9rem}
@media (max-width:520px){.symptom-list{grid-template-columns:1fr}}
.symptom-list label{display:flex;gap:.55rem;align-items:flex-start;font-family:var(--font-ui);font-size:.95rem;line-height:1.35;padding:.35rem 0;cursor:pointer}
.symptom-list input{width:1.15rem;height:1.15rem;accent-color:var(--teal);margin-top:.05rem;flex:none}
#symptom-result{font-family:var(--font-ui);margin-top:.8rem;font-size:.98rem}
#symptom-result:empty{display:none}
#symptom-result ul{padding-left:1.1rem;margin:.3rem 0 .5rem}

.band{padding:3rem 0}
.band.paper{background:var(--paper)}
.problems{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:0;border-top:2px solid var(--aquifer)}
.problem{padding:1.1rem 1.1rem 1.2rem 0;border-bottom:1px solid var(--rule);margin-right:1.4rem}
.problem h3{margin:0 0 .25rem;font-size:1.1rem}
.problem h3 a{color:var(--aquifer);text-decoration:none}
.problem h3 a:hover{text-decoration:underline}
.problem p{font-size:.98rem;margin:0;color:var(--ink)}
.problem .sym{font-family:var(--font-ui);font-size:.82rem;color:var(--casing);display:block;margin-bottom:.2rem}
.steps{counter-reset:s;list-style:none;padding:0;display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:1.6rem}
.steps li{counter-increment:s;border-top:2px solid var(--aquifer);padding-top:.8rem}
.steps li::before{content:counter(s);font-family:var(--font-ui);font-weight:800;font-size:1.6rem;color:var(--teal);display:block;line-height:1}
.steps h3{margin:.3rem 0 .3rem}
.prose{max-width:var(--measure)}

/* Matcher */
.matcher{background:var(--paper);border:1px solid var(--rule);border-radius:var(--r-md);padding:1.3rem 1.4rem;margin:0 0 2rem}
.matcher fieldset{border:0;padding:0;margin:0 0 1.2rem}
.matcher legend{font-family:var(--font-ui);font-weight:800;color:var(--aquifer);font-size:1.05rem;margin-bottom:.5rem}
.field-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(210px,1fr));gap:.9rem 1.2rem}
.field label{display:block;font-family:var(--font-ui);font-weight:600;font-size:.92rem;margin-bottom:.25rem}
.field .hint{display:block;font-family:var(--font-ui);font-size:.78rem;color:var(--casing);margin-top:.2rem}
.field input[type=number],.field select{width:100%;font:inherit;font-family:var(--font-ui);font-size:1rem;padding:.5rem .6rem;border:1px solid #9AA6AE;border-radius:var(--r-sm);background:#fff;color:var(--ink)}
.checks{display:flex;flex-wrap:wrap;gap:.4rem 1.2rem}
.checks label{font-family:var(--font-ui);font-size:.95rem;display:flex;gap:.45rem;align-items:center;cursor:pointer}
.checks input{width:1.1rem;height:1.1rem;accent-color:var(--teal)}
#match-result{margin-top:1.4rem}
.train{list-style:none;padding:0;margin:0 0 1rem;border-left:4px solid var(--water)}
.train li{position:relative;padding:.6rem 0 .8rem 1.2rem;margin:0}
.train li::before{content:"";position:absolute;left:-9px;top:1rem;width:14px;height:14px;border-radius:50%;background:var(--paper);border:3px solid var(--water)}
.train h3{margin:0 0 .15rem;font-size:1.05rem}
.train p{margin:.15rem 0;font-size:1rem}

/* Footer */
.site-footer{background:#0E2A48;color:#C8D6E4;font-family:var(--font-ui);font-size:.9rem;padding:2.5rem 0 3rem}
.site-footer a{color:#fff}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr;gap:2rem}
@media (max-width:760px){.footer-grid{grid-template-columns:1fr}}
.site-footer h2{color:#fff;font-size:1rem;margin:0 0 .6rem;font-stretch:100%}
.site-footer ul{list-style:none;padding:0;margin:0}
.site-footer p{max-width:60ch}

@media (prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important;animation:none!important}}
@media print{.site-header,.site-footer,.rail,.mobile-cta,.nav{display:none}}

@media (max-width:700px){
  .site-header .wrap{padding:.6rem 1rem;gap:.5rem}
  .nav{flex-wrap:nowrap;overflow-x:auto;gap:1rem;width:100%;scrollbar-width:none;-webkit-overflow-scrolling:touch}
  .nav::-webkit-scrollbar{display:none}
  .nav a{white-space:nowrap}
  .nav .nav-cta{order:-1}
}