:root {
  --ink: #17342e;
  --ink-soft: #4c665f;
  --forest: #123c34;
  --green: #1c7561;
  --mint: #72d8bb;
  --ice: #dff5f2;
  --lime: #d9f566;
  --cream: #f7f4e9;
  --paper: #fffef9;
  --line: rgba(23, 52, 46, .14);
  --shadow: 0 24px 80px rgba(18, 60, 52, .12);
  --radius: 28px;
  --max: 1200px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: "DM Sans", sans-serif;
  color: var(--ink);
  background: var(--paper);
  line-height: 1.6;
  overflow-x: hidden;
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; }
button, input { font: inherit; }
h1, h2, h3, p { margin-top: 0; }
h1, h2, h3 {
  font-family: "Manrope", sans-serif;
  line-height: 1.05;
  letter-spacing: -.04em;
}
h1 { font-size: clamp(3.6rem, 7.7vw, 7.2rem); }
h2 { font-size: clamp(2.4rem, 5vw, 4.75rem); }
h3 { font-size: 1.35rem; }
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}
.skip-link {
  position: fixed;
  top: 1rem;
  left: 1rem;
  z-index: 100;
  transform: translateY(-150%);
  padding: .75rem 1rem;
  border-radius: 10px;
  background: var(--lime);
  font-weight: 700;
}
.skip-link:focus { transform: translateY(0); }
.section {
  padding: clamp(5rem, 10vw, 9rem) max(1.25rem, calc((100vw - var(--max)) / 2));
}
.eyebrow {
  margin-bottom: 1.1rem;
  color: var(--green);
  font-weight: 800;
  font-size: .78rem;
  letter-spacing: .15em;
  text-transform: uppercase;
}
.eyebrow-light { color: var(--mint); }
.button {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  min-height: 3.5rem;
  padding: .85rem 1.6rem;
  border: 0;
  border-radius: 999px;
  background: var(--lime);
  color: var(--forest);
  font-weight: 800;
  text-decoration: none;
  cursor: pointer;
  box-shadow: 0 10px 30px rgba(98, 120, 20, .15);
  transition: transform .2s ease, box-shadow .2s ease;
}
.button:hover { transform: translateY(-2px); box-shadow: 0 15px 36px rgba(98, 120, 20, .23); }
.button-small { min-height: 2.75rem; padding: .6rem 1.15rem; }
.button-full { width: 100%; }
.text-link { font-weight: 700; text-underline-offset: 5px; }

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 5.25rem;
  padding: .75rem max(1.25rem, calc((100vw - var(--max)) / 2));
  transition: background .25s ease, box-shadow .25s ease;
}
.site-header.scrolled {
  background: rgba(255, 254, 249, .88);
  backdrop-filter: blur(18px);
  box-shadow: 0 1px 0 var(--line);
}
.brand {
  display: flex;
  align-items: center;
  gap: .7rem;
  color: var(--forest);
  font-family: "Manrope", sans-serif;
  font-size: 1.25rem;
  font-weight: 800;
  text-decoration: none;
}
.site-nav { display: flex; align-items: center; gap: 2rem; }
.site-nav > a:not(.button) { font-weight: 600; text-decoration: none; }
.site-nav > a:not(.button):hover { color: var(--green); }
.nav-toggle { display: none; border: 0; background: none; padding: .5rem; }
.nav-toggle > span:not(.sr-only) { display: block; width: 25px; height: 2px; margin: 5px; background: var(--forest); }

.hero {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 1.04fr .96fr;
  align-items: center;
  gap: clamp(3rem, 7vw, 7rem);
  padding-top: 8rem;
  background:
    radial-gradient(circle at 82% 28%, rgba(114, 216, 187, .22), transparent 26%),
    linear-gradient(145deg, var(--paper), #f2faf5);
}
.hero h1 { max-width: 9ch; margin-bottom: 1.6rem; }
.hero h1 em { color: var(--green); font-style: normal; }
.hero-lead { max-width: 39rem; color: var(--ink-soft); font-size: clamp(1.08rem, 1.6vw, 1.3rem); }
.hero-actions { display: flex; align-items: center; gap: 1.5rem; margin-top: 2.25rem; }
.hero-points {
  display: flex;
  flex-wrap: wrap;
  gap: .8rem 1.4rem;
  margin: 2.3rem 0 0;
  padding: 0;
  color: var(--ink-soft);
  font-size: .9rem;
  list-style: none;
}
.hero-points li::before { content: "✓"; margin-right: .45rem; color: var(--green); font-weight: 900; }
.hero-visual { position: relative; }
.hero-visual > img { position: relative; z-index: 2; filter: drop-shadow(0 35px 45px rgba(18, 60, 52, .16)); }
.sun {
  position: absolute;
  top: 4%;
  right: -8%;
  width: 42%;
  aspect-ratio: 1;
  border-radius: 50%;
  background: var(--lime);
  opacity: .7;
}
.air-label, .temperature-card {
  position: absolute;
  z-index: 3;
  border: 1px solid rgba(255,255,255,.8);
  background: rgba(255,255,255,.82);
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow);
}
.air-label { display: flex; align-items: center; gap: .55rem; padding: .65rem .9rem; border-radius: 999px; font-size: .78rem; font-weight: 700; }
.air-label span { width: 9px; height: 9px; border-radius: 50%; }
.air-label-in { top: 24%; left: 0; }
.air-label-in span { background: var(--mint); }
.air-label-out { top: 17%; right: -2%; }
.air-label-out span { background: #ef8b68; }
.temperature-card { right: 2%; bottom: 6%; display: grid; padding: 1rem 1.2rem; border-radius: 18px; }
.temperature-card span, .temperature-card small { color: var(--ink-soft); font-size: .75rem; }
.temperature-card strong { margin: .1rem 0; font: 800 1.75rem "Manrope", sans-serif; }

.section-dark { color: #f3fbf7; background: var(--forest); }
.problem {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem 7rem;
}
.problem h2 { margin-bottom: 0; }
.problem-copy { align-self: end; color: #cbe0d9; font-size: 1.08rem; }
.flow-comparison { grid-column: 1 / -1; display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; margin-top: 2rem; }
.flow-comparison article { padding: 1.2rem; border: 1px solid rgba(255,255,255,.13); border-radius: var(--radius); background: rgba(255,255,255,.055); }
.flow-comparison .comparison-good { background: #1a5549; }
.mini-room { position: relative; height: 220px; margin-bottom: 1.3rem; overflow: hidden; border-radius: 20px; background: #f1eee2; }
.mini-room::after { content: ""; position: absolute; inset: auto 0 0; height: 28%; background: #d8d1bf; }
.ac-unit { position: absolute; z-index: 2; left: 42%; bottom: 15%; width: 19%; height: 58%; border-radius: 12px 12px 4px 4px; background: #fff; box-shadow: 0 10px 24px #59756a33; }
.ac-unit::before { content: ""; position: absolute; inset: 8% 14% auto; height: 7%; border-radius: 5px; background: #cbd8d4; }
.flow { position: absolute; z-index: 1; height: 14px; border-radius: 20px; }
.flow-hot { top: 34%; left: 57%; width: 35%; background: #ef8b68; transform: rotate(-18deg); }
.flow-leak { top: 55%; left: -3%; width: 45%; background: #ef8b68; }
.flow-cool { top: 55%; left: 7%; width: 36%; background: var(--mint); }
.card-kicker { margin-bottom: .25rem; color: var(--mint); font-size: .75rem; font-weight: 800; letter-spacing: .12em; text-transform: uppercase; }
.flow-comparison h3 { margin-bottom: .4rem; letter-spacing: -.02em; }

.centered { max-width: 800px; margin-inline: auto; text-align: center; }
.section-heading > p:not(.eyebrow) { color: var(--ink-soft); font-size: 1.1rem; }
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.25rem; margin: 4rem 0 0; padding: 0; list-style: none; counter-reset: steps; }
.steps li { position: relative; min-height: 370px; padding: 1.5rem; border: 1px solid var(--line); border-radius: var(--radius); background: #f8fbf7; }
.step-number { color: var(--green); font-weight: 800; }
.step-icon { position: relative; height: 175px; margin: 1rem 0 1.6rem; border-radius: 18px; background: var(--ice); overflow: hidden; }
.step-icon::before, .step-icon::after { content: ""; position: absolute; }
.step-icon-fit::before { inset: 32px 62px 20px; border: 7px solid var(--forest); border-radius: 18px 18px 5px 5px; }
.step-icon-fit::after { top: 44px; left: 50%; width: 105px; height: 70px; border: 8px solid var(--green); border-radius: 18px; transform: translateX(-50%); }
.step-icon-strap::before { top: 28px; left: 50%; width: 86px; height: 120px; border-radius: 18px; background: white; transform: translateX(-50%); box-shadow: 0 8px 20px #18564820; }
.step-icon-strap::after { top: 70px; left: 16%; right: 16%; height: 13px; border: 5px solid var(--green); border-radius: 8px; }
.step-icon-cool::before { left: 50%; top: 48%; width: 80px; height: 80px; border: 10px solid var(--green); border-radius: 50%; transform: translate(-50%, -50%); }
.step-icon-cool::after { left: 50%; top: 48%; width: 16px; height: 130px; border-radius: 10px; background: var(--mint); transform: translate(-50%, -50%) rotate(45deg); box-shadow: 0 0 0 7px var(--ice); }
.steps p { margin-bottom: 0; color: var(--ink-soft); }

.proof {
  display: grid;
  grid-template-columns: .8fr 1.2fr;
  gap: clamp(3rem, 8vw, 7rem);
  align-items: center;
  background: var(--cream);
}
.proof-copy > p:not(.eyebrow):not(.fine-print) { color: var(--ink-soft); font-size: 1.08rem; }
.stat-row { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; margin: 2.2rem 0; }
.stat-row div { display: grid; gap: .35rem; }
.stat-row strong { color: var(--green); font: 800 clamp(1.8rem, 3vw, 2.6rem) "Manrope", sans-serif; letter-spacing: -.06em; }
.stat-row span { color: var(--ink-soft); font-size: .8rem; line-height: 1.35; }
.fine-print { color: #71837e; font-size: .75rem; }
.chart-card { padding: clamp(1.2rem, 3vw, 2.25rem); border-radius: var(--radius); background: white; box-shadow: var(--shadow); }
.chart-heading { display: flex; justify-content: space-between; gap: 1rem; }
.chart-title, .chart-subtitle { display: block; }
.chart-title { font-weight: 800; }
.chart-subtitle { color: var(--ink-soft); font-size: .75rem; }
.legend { align-self: center; color: var(--ink-soft); font-size: .7rem; white-space: nowrap; }
.legend span { display: inline-block; width: 8px; height: 8px; margin: 0 .3rem 0 .8rem; border-radius: 50%; }
.legend .before { background: #ef8b68; }
.legend .after { background: var(--green); }
.chart { position: relative; height: 330px; margin-top: 2rem; padding: 0 0 30px 40px; }
.chart svg { width: 100%; height: 100%; overflow: visible; }
.grid line { stroke: #dce7e2; stroke-width: 1; }
.line-before, .line-after { fill: none; stroke-width: 7; stroke-linecap: round; }
.line-before { stroke: #ef8b68; }
.line-after { stroke: var(--green); }
.setpoint { stroke: #82958e; stroke-width: 1.5; stroke-dasharray: 7 7; }
.y-axis { position: absolute; top: -5px; bottom: 30px; left: 0; display: flex; flex-direction: column; justify-content: space-between; color: var(--ink-soft); font-size: .7rem; }
.x-axis { position: absolute; right: 0; bottom: 0; left: 40px; display: flex; justify-content: space-between; color: var(--ink-soft); font-size: .7rem; }

.videos .section-heading { display: flex; justify-content: space-between; align-items: end; gap: 2rem; }
.video-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1.25rem; margin-top: 3rem; }
.video-card { padding: 1rem 1rem 1.5rem; border: 1px solid var(--line); border-radius: var(--radius); }
.video-placeholder { position: relative; display: grid; place-items: center; aspect-ratio: 16 / 10; margin-bottom: 1.5rem; border-radius: 20px; overflow: hidden; }
.video-before { background: linear-gradient(145deg, #e8c4b6, #7e9b94); }
.video-after { background: linear-gradient(145deg, var(--mint), var(--forest)); }
.video-placeholder::before { content: ""; width: 24%; height: 62%; border-radius: 15px 15px 5px 5px; background: rgba(255,255,255,.8); box-shadow: 0 15px 35px #17342e44; }
.video-placeholder button { position: absolute; display: grid; place-items: center; width: 64px; height: 64px; border: 0; border-radius: 50%; background: white; color: var(--forest); cursor: pointer; box-shadow: 0 8px 25px #17342e33; }
.video-badge { position: absolute; top: 1rem; left: 1rem; padding: .35rem .65rem; border-radius: 999px; background: rgba(255,255,255,.85); font-size: .7rem; font-weight: 800; }
.video-card h3 { margin-bottom: .4rem; }
.video-card p { margin-bottom: 0; color: var(--ink-soft); }
.media-note { margin-top: 1rem; color: var(--ink-soft); font-size: .78rem; text-align: center; }

.register {
  display: grid;
  grid-template-columns: .85fr 1.15fr;
  gap: clamp(3rem, 8vw, 8rem);
  color: white;
  background: var(--forest);
}
.register-intro > p:not(.eyebrow) { color: #cae0d8; font-size: 1.1rem; }
.register-intro ul { margin: 2rem 0 0; padding: 0; color: #d8e9e3; list-style: none; }
.register-intro li { margin-bottom: .8rem; }
.register-intro li::before { content: "✓"; margin-right: .6rem; color: var(--lime); font-weight: 900; }
.interest-form { padding: clamp(1.5rem, 4vw, 2.5rem); border-radius: var(--radius); background: white; color: var(--ink); }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.interest-form label > span:first-child { display: block; margin-bottom: .4rem; font-size: .8rem; font-weight: 700; }
.interest-form input[type="text"], .interest-form input[type="email"] {
  width: 100%;
  min-height: 3.25rem;
  margin-bottom: 1rem;
  padding: .7rem .85rem;
  border: 1px solid #cbd8d4;
  border-radius: 10px;
  background: #fbfdfb;
}
.interest-form input:focus { outline: 3px solid rgba(114, 216, 187, .25); border-color: var(--green); }
.upload { display: grid; place-items: center; min-height: 155px; margin: .35rem 0 1rem; padding: 1rem; border: 1.5px dashed #9db7af; border-radius: 15px; background: #f5faf7; text-align: center; cursor: pointer; }
.upload input { position: absolute; opacity: 0; pointer-events: none; }
.upload-icon { display: grid !important; place-items: center; width: 36px; height: 36px; margin-bottom: .5rem !important; border-radius: 50%; background: var(--ice); color: var(--green); font-weight: 900; }
.upload small { color: var(--ink-soft); }
.consent { display: flex; align-items: flex-start; gap: .6rem; margin: 1rem 0 1.25rem; color: var(--ink-soft); font-size: .78rem; }
.consent input { margin-top: .25rem; accent-color: var(--green); }
.form-note, .form-status { margin: .75rem 0 0; color: var(--ink-soft); font-size: .72rem; text-align: center; }
.form-status { color: var(--green); font-weight: 700; }

.faq { display: grid; grid-template-columns: .75fr 1.25fr; gap: clamp(3rem, 8vw, 8rem); }
.accordion details { border-top: 1px solid var(--line); }
.accordion details:last-child { border-bottom: 1px solid var(--line); }
.accordion summary { position: relative; padding: 1.5rem 2.5rem 1.5rem 0; font: 700 1.1rem "Manrope", sans-serif; cursor: pointer; list-style: none; }
.accordion summary::-webkit-details-marker { display: none; }
.accordion summary::after { content: "+"; position: absolute; right: .4rem; color: var(--green); font-size: 1.5rem; }
.accordion details[open] summary::after { content: "−"; }
.accordion details p { padding-right: 2rem; color: var(--ink-soft); }

.site-footer {
  display: grid;
  grid-template-columns: 1fr 1fr auto;
  align-items: center;
  gap: 2rem;
  padding: 2.5rem max(1.25rem, calc((100vw - var(--max)) / 2));
  color: #c9ded7;
  background: #0b2b25;
  font-size: .8rem;
}
.site-footer p { margin: 0; }
.brand-light { color: white; }
.copyright { text-align: right; }
.toast { position: fixed; right: 1.25rem; bottom: 1.25rem; z-index: 80; max-width: 360px; padding: .9rem 1.1rem; border-radius: 12px; background: var(--forest); color: white; box-shadow: var(--shadow); opacity: 0; pointer-events: none; transform: translateY(15px); transition: .25s ease; }
.toast.visible { opacity: 1; transform: translateY(0); }

.reveal { opacity: 0; transform: translateY(24px); transition: opacity .65s ease, transform .65s ease; }
.reveal.visible { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { scroll-behavior: auto !important; transition: none !important; }
  .reveal { opacity: 1; transform: none; }
}

@media (max-width: 860px) {
  .site-header { min-height: 4.5rem; }
  .nav-toggle { display: block; }
  .site-nav {
    position: absolute;
    top: calc(100% + .5rem);
    right: 1rem;
    left: 1rem;
    display: none;
    align-items: stretch;
    padding: 1rem;
    border: 1px solid var(--line);
    border-radius: 18px;
    background: var(--paper);
    box-shadow: var(--shadow);
  }
  .site-nav.open { display: grid; gap: .5rem; }
  .site-nav a { padding: .65rem; }
  .hero, .problem, .proof, .register, .faq { grid-template-columns: 1fr; }
  .hero { padding-top: 7rem; }
  .hero-visual { width: min(680px, 100%); margin-inline: auto; }
  .flow-comparison, .video-grid { grid-template-columns: 1fr; }
  .steps { grid-template-columns: 1fr; }
  .steps li { min-height: auto; }
  .videos .section-heading { display: block; }
  .site-footer { grid-template-columns: 1fr; text-align: center; }
  .site-footer .brand { justify-content: center; }
  .copyright { text-align: center; }
}

@media (max-width: 540px) {
  h1 { font-size: clamp(3rem, 17vw, 4.6rem); }
  .hero-actions { align-items: flex-start; flex-direction: column; }
  .hero-points { display: grid; }
  .air-label { display: none; }
  .temperature-card { right: 0; bottom: 0; }
  .form-row, .stat-row { grid-template-columns: 1fr; }
  .chart-heading { display: block; }
  .legend { margin-top: .75rem; }
}