:root {
  --navy: #0b2436;
  --navy-2: #123a51;
  --aqua: #3dd6c6;
  --aqua-dark: #087f79;
  --ice: #eef9f8;
  --sky: #d9f3f4;
  --white: #ffffff;
  --ink: #102331;
  --muted: #60717d;
  --line: #dbe4e9;
  --shadow: 0 18px 50px rgba(11, 36, 54, .12);
  --radius: 22px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: var(--white); font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; font-size: 16px; line-height: 1.6; }
a { color: inherit; }
button, input, select, textarea { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
.shell { width: min(1180px, calc(100% - 40px)); margin-inline: auto; }
.skip-link { position: fixed; left: 16px; top: -80px; z-index: 100; background: var(--white); color: var(--navy); padding: 12px 16px; border-radius: 8px; }
.skip-link:focus { top: 16px; }

.site-header { position: sticky; top: 0; z-index: 50; height: 74px; background: rgba(255,255,255,.94); border-bottom: 1px solid rgba(11,36,54,.08); backdrop-filter: blur(14px); }
.nav-wrap { height: 100%; display: flex; align-items: center; gap: 28px; }
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--navy); text-decoration: none; font-size: 1.25rem; letter-spacing: -.02em; white-space: nowrap; }
.brand-mark { width: 38px; aspect-ratio: 1; display: grid; place-items: center; border-radius: 12px 12px 12px 4px; color: var(--navy); background: var(--aqua); font-weight: 900; }
nav { margin-left: auto; display: flex; gap: 26px; }
nav a { color: #2c4656; text-decoration: none; font-size: .94rem; font-weight: 650; }
nav a:hover, nav a:focus-visible { color: var(--aqua-dark); }
.menu-button { display: none; }

.button { display: inline-flex; justify-content: center; align-items: center; min-height: 50px; padding: 0 22px; border: 1px solid var(--aqua); border-radius: 12px; background: var(--aqua); color: var(--navy); text-decoration: none; font-weight: 800; cursor: pointer; transition: transform .2s ease, box-shadow .2s ease, background .2s ease; }
.button:hover { transform: translateY(-2px); box-shadow: 0 12px 28px rgba(61,214,198,.22); }
.button:focus-visible, .filter:focus-visible, input:focus-visible, select:focus-visible, textarea:focus-visible, .menu-button:focus-visible { outline: 3px solid rgba(61,214,198,.45); outline-offset: 3px; }
.button-small { min-height: 42px; padding-inline: 16px; font-size: .9rem; }
.button-ghost { color: var(--white); background: rgba(255,255,255,.06); border-color: rgba(255,255,255,.48); }
.button-light { background: var(--white); border-color: var(--white); }

.hero { position: relative; min-height: 690px; display: grid; align-items: center; overflow: hidden; background: var(--navy); color: var(--white); }
.hero-image, .hero-shade { position: absolute; inset: 0; }
.hero-image { background: url("assets/hero-airco.png") center center / cover no-repeat; }
.hero-shade { background: linear-gradient(90deg, rgba(7,29,43,.96) 0%, rgba(7,29,43,.82) 36%, rgba(7,29,43,.18) 72%, rgba(7,29,43,.06) 100%); }
.hero-content { position: relative; z-index: 1; padding-block: 90px; }
.hero-content > * { max-width: 670px; }
.eyebrow { margin: 0 0 14px; color: var(--aqua); font-size: .78rem; font-weight: 900; letter-spacing: .13em; text-transform: uppercase; }
.eyebrow.dark { color: var(--aqua-dark); }
h1, h2, h3, p { margin-top: 0; }
h1 { margin-bottom: 24px; max-width: 760px !important; font-size: clamp(2.7rem, 6vw, 5.3rem); line-height: .98; letter-spacing: -.055em; }
h2 { margin-bottom: 20px; font-size: clamp(2rem, 4vw, 3.4rem); line-height: 1.06; letter-spacing: -.045em; }
h3 { line-height: 1.25; }
.hero-copy { color: rgba(255,255,255,.84); font-size: clamp(1.05rem, 2vw, 1.25rem); line-height: 1.65; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 32px; }
.trust-list { max-width: 860px; display: flex; flex-wrap: wrap; gap: 10px 30px; margin: 36px 0 0; padding: 0; list-style: none; color: rgba(255,255,255,.9); font-weight: 700; }
.trust-list li::before { content: "✓"; color: var(--aqua); margin-right: 9px; }

.section { padding: 110px 0; }
.section-heading { margin-bottom: 46px; }
.split-heading { display: grid; grid-template-columns: 1.15fr .85fr; gap: 70px; align-items: end; }
.split-heading p:last-child { color: var(--muted); }
.models-section { background: #f7fafb; }
.filter-bar { display: flex; justify-content: space-between; align-items: center; gap: 20px; margin-bottom: 30px; }
.filter-group { display: flex; flex-wrap: wrap; gap: 8px; }
.filter { padding: 10px 16px; border: 1px solid var(--line); border-radius: 999px; background: var(--white); color: var(--ink); font-weight: 750; cursor: pointer; }
.filter.active { color: var(--white); background: var(--navy); border-color: var(--navy); }
.power-filter { display: flex; align-items: center; gap: 10px; font-weight: 750; white-space: nowrap; }
select { min-height: 44px; padding: 0 38px 0 13px; border: 1px solid #c9d5dc; border-radius: 10px; background: var(--white); color: var(--ink); }
.product-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.product-card { display: flex; flex-direction: column; min-height: 100%; padding: 0 26px 26px; overflow: hidden; border: 1px solid var(--line); border-radius: var(--radius); background: var(--white); box-shadow: 0 8px 24px rgba(11,36,54,.05); transition: transform .2s ease, border-color .2s ease, box-shadow .2s ease; }
.product-card:hover { transform: translateY(-4px); border-color: #addbd8; box-shadow: var(--shadow); }
.product-image-wrap { height: 220px; display: grid; place-items: center; margin: 0 -26px 24px; padding: 28px; overflow: hidden; background: #fff; border-bottom: 1px solid var(--line); }
.product-image { display: block; width: auto; height: auto; max-width: 88%; max-height: 88%; object-fit: contain; object-position: center; }
.product-top { display: flex; justify-content: space-between; gap: 16px; margin-bottom: 22px; }
.brand-label { margin: 0; color: var(--aqua-dark); font-size: .76rem; font-weight: 900; letter-spacing: .08em; text-transform: uppercase; }
.power-pill { flex: 0 0 auto; align-self: flex-start; padding: 6px 10px; border-radius: 999px; background: var(--ice); color: var(--aqua-dark); font-size: .8rem; font-weight: 900; }
.product-card h3 { margin-bottom: 8px; font-size: 1.35rem; letter-spacing: -.02em; }
.model-code { margin-bottom: 24px; color: var(--muted); font-size: .92rem; }
.price-wrap { margin-top: auto; padding-top: 20px; border-top: 1px solid var(--line); }
.price-label { display: block; color: var(--muted); font-size: .8rem; }
.price { display: block; margin: 2px 0 16px; color: var(--navy); font-size: 2rem; line-height: 1.2; letter-spacing: -.04em; }
.card-actions { display: flex; align-items: center; gap: 15px; }
.card-actions .button { flex: 1; min-height: 44px; padding-inline: 14px; font-size: .9rem; }
.source-link { color: var(--aqua-dark); font-size: .86rem; font-weight: 750; }
.source-note { margin: 28px 0 0; color: var(--muted); font-size: .84rem; }
.no-results { padding: 30px; border-radius: 14px; background: var(--white); text-align: center; }

.prep-section { background: var(--navy); color: var(--white); }
.prep-grid { display: grid; grid-template-columns: .9fr 1.1fr; gap: 85px; align-items: center; }
.lead { color: inherit; font-size: 1.15rem; line-height: 1.75; opacity: .82; }
.steps-card { padding: 34px; border: 1px solid rgba(255,255,255,.14); border-radius: 26px; background: rgba(255,255,255,.07); box-shadow: var(--shadow); }
.steps { margin: 0; padding: 0; list-style: none; }
.steps li { display: grid; grid-template-columns: 44px 1fr; gap: 16px; padding: 20px 0; border-bottom: 1px solid rgba(255,255,255,.12); }
.steps li:first-child { padding-top: 0; }
.steps li > span { width: 40px; height: 40px; display: grid; place-items: center; border-radius: 12px; background: var(--aqua); color: var(--navy); font-weight: 900; }
.steps p { margin: 5px 0 0; color: rgba(255,255,255,.7); }
.safety-note { margin: 22px 0 0; padding: 16px; border-radius: 12px; background: rgba(61,214,198,.1); color: rgba(255,255,255,.86); font-size: .9rem; }

.certification-section { background: var(--ice); }
.certification-grid { display: grid; grid-template-columns: 1fr .9fr; gap: 90px; align-items: center; }
.cert-links { display: flex; flex-wrap: wrap; gap: 20px; margin-top: 26px; }
.cert-links a { color: var(--aqua-dark); font-weight: 800; }
.cert-badges { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.cert-badge { min-height: 235px; display: flex; flex-direction: column; align-items: center; justify-content: center; border: 1px solid #b6ddda; border-radius: 24px; background: var(--white); box-shadow: 0 10px 30px rgba(11,36,54,.07); text-align: center; }
.cert-badge span { color: var(--aqua-dark); font-weight: 900; letter-spacing: .13em; }
.cert-badge strong { color: var(--navy); font-size: 4.2rem; line-height: 1; letter-spacing: -.06em; }
.cert-badge small { max-width: 150px; margin-top: 12px; color: var(--muted); font-size: .8rem; }
.cert-badges > p { grid-column: 1 / -1; color: var(--muted); font-size: .82rem; }

.contact-section { background: var(--navy-2); color: var(--white); }
.contact-grid { display: grid; grid-template-columns: .9fr 1.1fr; gap: 80px; align-items: start; }
.contact-cards { display: grid; gap: 10px; margin-top: 32px; }
.contact-cards a { padding: 18px 20px; border: 1px solid rgba(255,255,255,.15); border-radius: 14px; background: rgba(255,255,255,.06); text-decoration: none; }
.contact-cards span, .contact-cards strong { display: block; }
.contact-cards span { color: rgba(255,255,255,.65); font-size: .8rem; }
.contact-cards strong { font-size: 1.05rem; }
.contact-form { padding: 32px; border-radius: 24px; background: var(--white); color: var(--ink); box-shadow: 0 22px 60px rgba(0,0,0,.18); }
.contact-form label { display: grid; gap: 7px; margin-bottom: 16px; font-size: .88rem; font-weight: 800; }
.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
input, textarea, .contact-form select { width: 100%; min-height: 48px; padding: 10px 12px; border: 1px solid #cbd7de; border-radius: 10px; color: var(--ink); background: #fbfdfe; }
textarea { resize: vertical; }
.contact-form .button { width: 100%; border: 0; }
.form-note { margin: 12px 0 0; color: var(--muted); font-size: .78rem; text-align: center; }

footer { padding: 34px 0; background: #071a27; color: rgba(255,255,255,.68); }
.footer-wrap { display: flex; justify-content: space-between; align-items: center; gap: 24px; }
.footer-wrap p { margin: 0; font-size: .82rem; text-align: center; }
.footer-brand { color: var(--white); }
.footer-brand .brand-mark { width: 32px; }

@media (max-width: 980px) {
  nav { position: absolute; inset: 74px 20px auto; display: none; flex-direction: column; gap: 0; padding: 10px; border: 1px solid var(--line); border-radius: 16px; background: var(--white); box-shadow: var(--shadow); }
  nav.open { display: flex; }
  nav a { padding: 13px; }
  .menu-button { display: inline-flex; margin-left: auto; padding: 8px 12px; border: 1px solid var(--line); border-radius: 9px; background: var(--white); color: var(--navy); font-weight: 800; }
  .header-cta { display: none; }
  .split-heading, .prep-grid, .certification-grid, .contact-grid { grid-template-columns: 1fr; gap: 42px; }
  .product-grid { grid-template-columns: repeat(2, 1fr); }
  .section { padding-block: 82px; }
  .certification-grid { align-items: start; }
}

@media (max-width: 640px) {
  .shell { width: min(100% - 28px, 1180px); }
  .site-header { height: 66px; }
  nav { inset: 66px 14px auto; }
  .hero { min-height: 720px; align-items: end; }
  .hero-image { background-position: 67% center; }
  .hero-shade { background: linear-gradient(0deg, rgba(7,29,43,.98) 0%, rgba(7,29,43,.9) 50%, rgba(7,29,43,.3) 100%); }
  .hero-content { padding: 150px 0 52px; }
  h1 { font-size: clamp(2.45rem, 12vw, 3.6rem); }
  .hero-actions, .hero-actions .button { width: 100%; }
  .trust-list { display: grid; gap: 7px; }
  .section { padding-block: 68px; }
  .filter-bar { align-items: stretch; flex-direction: column; }
  .power-filter { justify-content: space-between; }
  .power-filter select { flex: 1; }
  .product-grid { grid-template-columns: 1fr; }
  .product-card { padding: 22px; }
  .card-actions { align-items: stretch; flex-direction: column; }
  .source-link { text-align: center; }
  .steps-card, .contact-form { padding: 22px; }
  .cert-badges { grid-template-columns: 1fr; }
  .cert-badges > p { grid-column: auto; }
  .cert-badge { min-height: 190px; }
  .field-row { grid-template-columns: 1fr; gap: 0; }
  .footer-wrap { flex-direction: column; text-align: center; }
}

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