:root {
  --ink: #061828;
  --ink-2: #0b2840;
  --blue: #19b7de;
  --blue-light: #dff8ff;
  --lime: #b8f34a;
  --paper: #f7fbfd;
  --white: #ffffff;
  --muted: #5b7182;
  --line: #d7e6ed;
  --shadow: 0 24px 70px rgba(6, 24, 40, .14);
  --radius: 1.35rem;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 1rem;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; }
img { display: block; max-width: 100%; }
button, input, select, textarea { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
:focus-visible { outline: 3px solid var(--blue); outline-offset: 3px; }

.skip-link {
  position: fixed; left: 1rem; top: -5rem; z-index: 100;
  padding: .75rem 1rem; background: var(--white); color: var(--ink); border-radius: .6rem;
}
.skip-link:focus { top: 1rem; }
.container { width: min(1140px, calc(100% - 2rem)); margin-inline: auto; }
.eyebrow {
  display: inline-flex; align-items: center; gap: .55rem; margin: 0 0 1rem;
  font-size: .82rem; font-weight: 800; letter-spacing: .13em; text-transform: uppercase;
}
.eyebrow::before { content: ""; width: 1.8rem; height: 2px; background: currentColor; }
.section { padding: 6rem 0; }
.section-title { max-width: 740px; margin-bottom: 2.6rem; }
.section-title h2 { margin: 0 0 1rem; font-size: clamp(2rem, 4vw, 3.4rem); line-height: 1.05; letter-spacing: -.045em; }
.section-title p { margin: 0; color: var(--muted); font-size: 1.08rem; }

.site-header {
  position: sticky; top: 0; z-index: 50; border-bottom: 1px solid rgba(215,230,237,.85);
  background: rgba(247,251,253,.9); backdrop-filter: blur(18px);
}
.nav-wrap { min-height: 76px; display: flex; align-items: center; justify-content: space-between; gap: 1rem; }
.brand { display: inline-flex; align-items: center; gap: .75rem; text-decoration: none; font-weight: 850; letter-spacing: -.025em; }
.brand-mark {
  display: grid; place-items: center; width: 42px; height: 42px; border-radius: 13px;
  background: var(--ink); color: var(--blue);
}
.brand-mark svg { width: 25px; }
.brand-name { line-height: 1.05; }
.brand-name small { display: block; color: var(--muted); font-size: .68rem; letter-spacing: .12em; text-transform: uppercase; margin-top: .25rem; }
.nav-links { display: flex; align-items: center; gap: 1.6rem; }
.nav-links a { text-decoration: none; font-weight: 700; font-size: .94rem; }
.nav-links a:not(.button):hover { color: #078eae; }
.menu-toggle { display: none; border: 0; background: transparent; padding: .55rem; color: var(--ink); }
.menu-toggle svg { width: 26px; display: block; }

.button {
  display: inline-flex; justify-content: center; align-items: center; gap: .55rem;
  min-height: 50px; padding: .78rem 1.2rem; border: 1px solid transparent; border-radius: .85rem;
  background: var(--lime); color: var(--ink); text-decoration: none; font-weight: 850; cursor: pointer;
  box-shadow: 0 10px 25px rgba(184,243,74,.16); transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
}
.button:hover { transform: translateY(-2px); box-shadow: 0 16px 30px rgba(184,243,74,.22); }
.button-dark { background: var(--ink); color: var(--white); box-shadow: 0 10px 25px rgba(6,24,40,.15); }
.button-outline { background: transparent; border-color: rgba(255,255,255,.3); color: var(--white); box-shadow: none; }
.button svg { width: 18px; }

.hero { background: var(--ink); color: var(--white); overflow: hidden; position: relative; }
.hero::after {
  content: ""; position: absolute; inset: auto -8rem -11rem auto; width: 32rem; aspect-ratio: 1;
  border: 1px solid rgba(35,199,236,.24); border-radius: 50%; box-shadow: 0 0 0 5rem rgba(35,199,236,.035), 0 0 0 10rem rgba(35,199,236,.025);
}
.hero-grid { min-height: 700px; display: grid; grid-template-columns: 1.05fr .95fr; align-items: center; gap: 3rem; padding: 5.5rem 0; position: relative; z-index: 1; }
.hero-copy { max-width: 660px; }
.hero .eyebrow { color: var(--blue); }
.hero h1 { margin: 0 0 1.4rem; font-size: clamp(3rem, 6.4vw, 6.3rem); line-height: .93; letter-spacing: -.065em; max-width: 760px; }
.hero h1 span { color: var(--lime); }
.hero-copy > p { max-width: 610px; margin: 0; color: #c9d8e2; font-size: clamp(1.05rem, 1.7vw, 1.25rem); }
.hero-actions { display: flex; gap: .8rem; flex-wrap: wrap; margin-top: 2rem; }
.trust-row { display: flex; flex-wrap: wrap; gap: .75rem 1.35rem; margin-top: 2.2rem; color: #d5e4eb; font-size: .92rem; }
.trust-row span { display: inline-flex; align-items: center; gap: .5rem; }
.trust-row svg { width: 18px; color: var(--blue); }
.hero-visual {
  position: relative; min-height: 510px; border-radius: 1.8rem; overflow: hidden;
  background: linear-gradient(145deg, #0e3d59, #061828 75%); border: 1px solid rgba(255,255,255,.12); box-shadow: var(--shadow);
}
.hero-visual img { width: 100%; height: 100%; min-height: 510px; object-fit: cover; object-position: center; opacity: .88; }
.hero-visual::after { content: ""; position: absolute; inset: 0; background: linear-gradient(180deg, transparent 45%, rgba(6,24,40,.9)); }
.visual-badge { position: absolute; z-index: 2; left: 1.4rem; right: 1.4rem; bottom: 1.4rem; display: flex; gap: .9rem; align-items: center; }
.visual-badge strong { display: block; font-size: 1.08rem; }
.visual-badge span { color: #c6d9e3; font-size: .9rem; }
.pulse { width: 46px; height: 46px; border-radius: 50%; display: grid; place-items: center; flex: 0 0 auto; background: var(--lime); color: var(--ink); }
.pulse svg { width: 24px; }

.solutions-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; }
.card { background: var(--white); border: 1px solid var(--line); border-radius: var(--radius); padding: 2rem; box-shadow: 0 15px 45px rgba(24,62,84,.06); }
.service-card { position: relative; min-height: 310px; overflow: hidden; transition: transform .25s ease, border-color .25s ease; }
.service-card:hover { transform: translateY(-6px); border-color: #8dd8e9; }
.service-number { position: absolute; right: 1.4rem; top: 1rem; font-size: 3.2rem; line-height: 1; font-weight: 900; color: #e7f4f8; }
.icon-box { width: 54px; height: 54px; display: grid; place-items: center; border-radius: 1rem; background: var(--blue-light); color: #078eae; margin-bottom: 1.5rem; }
.icon-box svg { width: 28px; }
.card h3 { font-size: 1.35rem; margin: 0 0 .75rem; letter-spacing: -.025em; }
.card p { color: var(--muted); margin: 0; }
.feature-list { margin: 1.2rem 0 0; padding: 0; list-style: none; display: grid; gap: .55rem; color: #2e5267; }
.feature-list li { display: flex; gap: .55rem; }
.feature-list li::before { content: "✓"; color: #0a9d75; font-weight: 900; }

.filtration { background: var(--ink); color: var(--white); }
.filtration-heading { max-width: none; display: grid; grid-template-columns: 1.15fr .85fr; gap: 3rem; align-items: end; }
.filtration-heading .eyebrow { color: var(--blue); }
.filtration-heading h2 { max-width: 680px; }
.filtration-heading > p { color: #c6d9e3; padding-bottom: .35rem; }
.filtration-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1.2rem; }
.filter-card { overflow: hidden; border: 1px solid rgba(255,255,255,.13); border-radius: 1.55rem; background: #0b2840; box-shadow: 0 20px 55px rgba(0,0,0,.18); }
.filter-image { position: relative; aspect-ratio: 4 / 3; overflow: hidden; background: #123b54; }
.filter-image::after { content: ""; position: absolute; inset: 0; background: linear-gradient(180deg, transparent 62%, rgba(6,24,40,.65)); pointer-events: none; }
.filter-image img { width: 100%; height: 100%; object-fit: cover; transition: transform .5s ease; }
.filter-card:hover .filter-image img { transform: scale(1.025); }
.filter-tag { position: absolute; z-index: 1; left: 1.1rem; bottom: 1rem; padding: .42rem .8rem; border-radius: 99px; background: var(--lime); color: var(--ink); font-size: .8rem; font-weight: 850; }
.filter-content { padding: clamp(1.4rem, 3vw, 2.2rem); }
.filter-kicker { margin: 0 0 .35rem; color: var(--blue); text-transform: uppercase; letter-spacing: .11em; font-size: .78rem; font-weight: 850; }
.filter-content h3 { margin: 0 0 .75rem; font-size: clamp(1.6rem, 3vw, 2.2rem); letter-spacing: -.035em; line-height: 1.05; }
.filter-content > p:not(.filter-kicker) { margin: 0; color: #c6d9e3; }
.filter-content .feature-list { color: #d7e5ec; }
.filtration-note { display: grid; grid-template-columns: 1fr auto; gap: 2rem; align-items: center; margin-top: 1.2rem; padding: 1.4rem 1.5rem; border-radius: 1rem; background: var(--blue-light); color: var(--ink); }
.filtration-note p { margin: 0; max-width: 800px; }

.audience { background: var(--white); }
.audience-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1.2rem; }
.audience-panel { border-radius: 1.6rem; padding: clamp(2rem, 5vw, 3.5rem); min-height: 390px; display: flex; flex-direction: column; justify-content: flex-end; position: relative; overflow: hidden; }
.audience-panel::before { content: ""; position: absolute; width: 15rem; height: 15rem; border-radius: 50%; top: -6rem; right: -4rem; border: 42px solid rgba(255,255,255,.08); }
.audience-panel h3 { font-size: clamp(2rem, 3.4vw, 3rem); margin: 0 0 .75rem; letter-spacing: -.045em; line-height: 1; }
.audience-panel p { max-width: 500px; margin: 0; }
.audience-panel .tag { align-self: flex-start; margin-bottom: auto; border-radius: 99px; padding: .38rem .8rem; font-weight: 800; font-size: .82rem; }
.residential { background: var(--blue-light); color: var(--ink); }
.residential .tag { background: var(--white); color: #078eae; }
.commercial { background: var(--ink-2); color: var(--white); }
.commercial .tag { background: rgba(184,243,74,.14); color: var(--lime); }
.commercial p { color: #c6d8e2; }

.process { background: #ecf7fa; }
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1rem; counter-reset: step; }
.step { counter-increment: step; position: relative; padding-top: 3.6rem; }
.step::before { content: "0" counter(step); position: absolute; top: 0; left: 0; font-weight: 900; color: #078eae; letter-spacing: .08em; }
.step:not(:last-child)::after { content: ""; position: absolute; top: .75rem; left: 3rem; right: 0; height: 1px; background: #acd6e1; }
.step h3 { margin: 0 0 .45rem; }
.step p { margin: 0; color: var(--muted); }

.cta-section { padding: 5rem 0; background: var(--white); }
.cta-box { position: relative; overflow: hidden; background: var(--ink); color: var(--white); border-radius: 1.8rem; padding: clamp(2.2rem, 6vw, 5rem); display: grid; grid-template-columns: 1fr auto; gap: 2rem; align-items: center; }
.cta-box::after { content: ""; position: absolute; width: 18rem; height: 18rem; border-radius: 50%; background: rgba(35,199,236,.08); right: -7rem; top: -8rem; }
.cta-box h2 { margin: 0 0 .7rem; font-size: clamp(2rem, 4vw, 3.6rem); line-height: 1; letter-spacing: -.045em; }
.cta-box p { margin: 0; color: #c6d9e3; }
.cta-box .button { position: relative; z-index: 1; }

.site-footer { background: #03111d; color: #bdd0db; padding: 3rem 0; }
.footer-grid { display: grid; grid-template-columns: 1fr auto; gap: 2rem; align-items: center; }
.site-footer .brand { color: var(--white); }
.footer-links { display: flex; gap: 1.2rem; flex-wrap: wrap; justify-content: flex-end; }
.footer-links a { text-decoration: none; }
.footer-meta { border-top: 1px solid rgba(255,255,255,.12); margin-top: 2rem; padding-top: 1.4rem; font-size: .86rem; display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap; }

.page-hero { background: var(--ink); color: var(--white); padding: 5rem 0 4.5rem; }
.page-hero .eyebrow { color: var(--blue); }
.page-hero h1 { margin: 0 0 1rem; font-size: clamp(2.8rem, 6vw, 5.4rem); line-height: .95; letter-spacing: -.055em; }
.page-hero p { max-width: 690px; margin: 0; color: #c8d9e2; font-size: 1.12rem; }
.form-section { padding: 4rem 0 6rem; }
.form-shell { display: grid; grid-template-columns: 290px 1fr; gap: 1.2rem; align-items: start; }
.form-aside { position: sticky; top: 100px; }
.form-aside h2 { margin: 0 0 .6rem; font-size: 1.45rem; }
.form-aside p { margin: 0 0 1.2rem; color: var(--muted); }
.contact-chip { display: block; padding: .9rem 1rem; border-radius: .85rem; background: var(--blue-light); color: #076b83; text-decoration: none; font-weight: 800; overflow-wrap: anywhere; }
.form-card { background: var(--white); border: 1px solid var(--line); border-radius: 1.5rem; box-shadow: var(--shadow); overflow: hidden; }
.tabs { display: grid; grid-template-columns: repeat(3, 1fr); border-bottom: 1px solid var(--line); background: #f2f8fa; }
.tab { border: 0; border-right: 1px solid var(--line); background: transparent; padding: 1.1rem .7rem; color: var(--muted); font-weight: 800; cursor: pointer; }
.tab:last-child { border-right: 0; }
.tab[aria-selected="true"] { background: var(--white); color: var(--ink); box-shadow: inset 0 -3px var(--blue); }
.tab .tab-number { display: inline-grid; place-items: center; width: 27px; height: 27px; margin-right: .4rem; border-radius: 50%; background: #dceaf0; font-size: .8rem; }
.tab[aria-selected="true"] .tab-number { background: var(--blue); color: var(--ink); }
.panel { padding: clamp(1.3rem, 4vw, 2.5rem); }
.panel[hidden] { display: none; }
.panel h2 { margin: 0 0 .35rem; font-size: 1.8rem; letter-spacing: -.03em; }
.panel-intro { margin: 0 0 1.8rem; color: var(--muted); }
.field-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.field { display: grid; gap: .4rem; }
.field.full { grid-column: 1 / -1; }
label, legend { font-weight: 800; font-size: .92rem; }
input, select, textarea {
  width: 100%; border: 1px solid #b9cdd7; border-radius: .75rem; background: var(--white); color: var(--ink); padding: .82rem .9rem; min-height: 50px;
}
textarea { min-height: 135px; resize: vertical; }
input:focus, select:focus, textarea:focus { outline: 3px solid rgba(25,183,222,.22); border-color: var(--blue); }
.required { color: #b52f2f; }
.radio-group { border: 0; padding: 0; margin: 0; }
.choice-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: .75rem; margin-top: .55rem; }
.choice { display: flex; align-items: flex-start; gap: .65rem; padding: .9rem; border: 1px solid var(--line); border-radius: .75rem; cursor: pointer; }
.choice:has(input:checked) { border-color: var(--blue); background: var(--blue-light); }
.choice input { width: 18px; min-height: 18px; margin-top: .2rem; }
.choice span { font-weight: 700; }
.panel-actions { display: flex; justify-content: space-between; gap: .75rem; margin-top: 2rem; }
.panel-actions .button { min-width: 130px; }
.button-secondary { background: #eaf3f6; color: var(--ink); box-shadow: none; }
.form-note { margin: 1.2rem 0 0; padding: 1rem; background: #f3f8fa; color: var(--muted); border-radius: .75rem; font-size: .9rem; }
.form-message { display: none; margin-top: 1rem; padding: 1rem; border-radius: .75rem; background: #e7f8ee; color: #14613a; font-weight: 700; }
.form-message.show { display: block; }
.copy-button { width: 100%; margin-top: .75rem; background: transparent; border: 1px solid #a9bdc8; color: var(--ink); box-shadow: none; }
.honeypot { position: absolute !important; width: 1px !important; height: 1px !important; overflow: hidden !important; clip: rect(0, 0, 0, 0) !important; white-space: nowrap !important; }
.button:disabled { opacity: .65; cursor: wait; transform: none; }
.success-page { min-height: calc(100vh - 76px); display: grid; place-items: center; padding: 4rem 1rem; background: linear-gradient(145deg, var(--ink), var(--ink-2)); }
.success-card { width: min(720px, 100%); padding: clamp(2rem, 6vw, 4.5rem); border-radius: 1.8rem; background: var(--white); box-shadow: var(--shadow); text-align: center; }
.success-card .eyebrow { color: #078eae; }
.success-card .eyebrow::before { display: none; }
.success-card h1 { margin: 0 0 1rem; font-size: clamp(2.2rem, 5vw, 4rem); line-height: 1; letter-spacing: -.05em; }
.success-card > p:not(.eyebrow) { margin: 0 auto; max-width: 580px; color: var(--muted); font-size: 1.08rem; }
.success-icon { display: grid; place-items: center; width: 74px; height: 74px; margin: 0 auto 1.5rem; border-radius: 50%; background: var(--lime); color: var(--ink); }
.success-icon svg { width: 38px; }
.success-actions { display: flex; justify-content: center; gap: .75rem; flex-wrap: wrap; margin-top: 2rem; }

@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; padding: 4.5rem 0; }
  .hero-visual { min-height: 380px; }
  .hero-visual img { min-height: 380px; }
  .solutions-grid, .steps { grid-template-columns: repeat(2, 1fr); }
  .audience-grid { grid-template-columns: 1fr; }
  .filtration-heading { grid-template-columns: 1fr; gap: 1rem; }
  .filtration-grid { grid-template-columns: 1fr; }
  .form-shell { grid-template-columns: 1fr; }
  .form-aside { position: static; }
}

@media (max-width: 720px) {
  .section { padding: 4.5rem 0; }
  .menu-toggle { display: block; }
  .nav-links { display: none; position: absolute; top: 76px; left: 0; right: 0; padding: 1rem; background: var(--paper); border-bottom: 1px solid var(--line); box-shadow: 0 18px 40px rgba(6,24,40,.12); flex-direction: column; align-items: stretch; }
  .nav-links.open { display: flex; }
  .nav-links a { padding: .65rem .4rem; }
  .nav-links .button { width: 100%; }
  .hero-grid { min-height: auto; }
  .hero h1 { font-size: clamp(3rem, 15vw, 5rem); }
  .solutions-grid, .steps, .field-grid { grid-template-columns: 1fr; }
  .service-card { min-height: auto; }
  .step:not(:last-child)::after { display: none; }
  .cta-box { grid-template-columns: 1fr; }
  .filtration-note { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-links { justify-content: flex-start; }
  .tabs { grid-template-columns: 1fr; }
  .tab { border-right: 0; border-bottom: 1px solid var(--line); text-align: left; }
  .choice-grid { grid-template-columns: 1fr; }
  .panel-actions { flex-wrap: wrap; }
  .panel-actions .button { flex: 1; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition: none !important; }
}