/* EfficiencyMax Furnace Backup Intake Damper */
:root {
  --navy: #012555;
  --navy-deep: #00193a;
  --ink: #132033;
  --muted: #4a5b70;
  --blue: #8ecdf6;
  --blue-soft: #e8f5fd;
  --blue-mid: #c5e7fa;
  --flame: #e04010;
  --flame-dark: #c2340c;
  --paper: #f7fbfe;
  --white: #ffffff;
  --line: #d3e4f0;
  --tbd-ink: #7a4e00;
  --tbd-bg: #fff3d1;
  --tbd-line: #e6c56a;
  --ok: #0c5c3c;
  --shadow: 0 10px 30px rgba(1, 37, 85, 0.08);
  --radius: 16px;
  --max: 1120px;
  --header-h: 76px;
  --font-serif: "Source Serif 4", Georgia, "Times New Roman", serif;
  --font-sans: "DM Sans", "Helvetica Neue", Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }
html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 12px);
}
html, body { margin: 0; padding: 0; }
body {
  font-family: var(--font-sans);
  color: var(--ink);
  background: var(--paper);
  line-height: 1.55;
  font-size: 17px;
}

img { max-width: 100%; height: auto; display: block; }
a { color: var(--navy); }
a:hover { color: var(--flame-dark); }
:focus-visible {
  outline: 3px solid var(--blue);
  outline-offset: 3px;
}

.skip {
  position: absolute;
  left: 12px;
  top: -40px;
  background: var(--navy);
  color: #fff;
  padding: 8px 12px;
  z-index: 1000;
}
.skip:focus { top: 12px; }

.preview-banner {
  background: var(--navy);
  color: #fff;
  font-size: 14px;
  letter-spacing: 0.01em;
  text-align: center;
  padding: 10px 16px;
}
.preview-banner strong { color: var(--blue); }

.tbd {
  display: inline-block;
  font-family: var(--font-sans);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--tbd-ink);
  background: var(--tbd-bg);
  border: 1px solid var(--tbd-line);
  border-radius: 999px;
  padding: 2px 8px;
  line-height: 1.4;
  vertical-align: middle;
  margin-left: 6px;
}

.wrap {
  width: min(var(--max), calc(100% - 40px));
  margin: 0 auto;
}

.site-header {
  background: #fff;
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 50;
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: var(--header-h);
  gap: 16px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--navy);
  flex-shrink: 0;
}
.brand img { width: 52px; height: 52px; object-fit: contain; }
.brand-name {
  font-weight: 700;
  font-size: 18px;
  letter-spacing: -0.02em;
}

.nav { display: flex; align-items: center; gap: 8px; }
.nav a {
  text-decoration: none;
  color: var(--navy);
  font-weight: 600;
  font-size: 14px;
  padding: 8px 16px;
  border-radius: 999px;
  white-space: nowrap;
}
.nav a:hover, .nav a[aria-current="page"] { background: var(--blue-soft); color: var(--navy); }
.nav .nav-buy {
  background: var(--navy);
  color: #fff !important;
  margin-left: 8px;
}
.nav .nav-buy:hover { background: var(--flame); }

.menu-toggle {
  display: none;
  background: none;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 8px 10px;
  color: var(--navy);
  font-weight: 700;
  font-size: 14px;
  cursor: pointer;
}

/* Hero */
.hero {
  background:
    radial-gradient(1200px 500px at 10% -10%, rgba(142, 205, 246, 0.45), transparent 60%),
    linear-gradient(180deg, #fff 0%, var(--blue-soft) 100%);
  padding: 48px 0 64px;
}
.hero-grid {
  display: grid;
  grid-template-columns: 0.95fr 1.05fr;
  grid-template-areas: "photo copy";
  gap: 48px;
  align-items: start;
}
.hero-photo { grid-area: photo; }
.hero-copy { grid-area: copy; }
.eyebrow {
  font-size: 13px;
  font-weight: 700;
  line-height: 1.55;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 10px;
}
h1, h2, h3, .serif { font-family: var(--font-serif); font-weight: 600; letter-spacing: -0.02em; color: var(--navy); }
h1 { font-size: clamp(32px, 4.6vw, 52px); line-height: 1.12; margin: 0 0 14px; }
.tagline {
  font-family: var(--font-serif);
  font-size: clamp(22px, 2.6vw, 30px);
  font-weight: 600;
  color: var(--navy);
  margin: 0;
  line-height: 1.25;
}
.subhead {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: clamp(22px, 2.6vw, 30px);
  color: var(--flame);
  margin: 4px 0 12px;
  line-height: 1.2;
}
.hero-intro .subhead {
  margin: 2px 0 10px;
}
.page-hero .subhead {
  margin: 4px 0 12px;
}
.hero-hook {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(22px, 2.8vw, 32px);
  color: var(--navy);
  margin: 14px 0 0;
  line-height: 1.25;
}
.hero-hook strong { font-weight: 700; }
.hero-offer { margin-top: 18px; }
.hero-footnote {
  margin: 24px 0 0;
  font-size: 13px;
  color: var(--muted);
}
.lede { font-size: 19px; color: var(--ink); max-width: 38rem; margin: 0 0 18px; }
.hero-pipes {
  margin: 0 0 18px;
  width: 100%;
  max-width: 38rem;
}
.hero-pipes img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 14px;
  box-shadow: var(--shadow);
  background: #e8e8e8;
}
.dollarize {
  font-size: 18px;
  font-weight: 600;
  color: var(--navy);
  margin: 0 0 22px;
  max-width: 38rem;
}
.actions { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 22px; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  text-decoration: none;
  font-weight: 700;
  font-size: 16px;
  border-radius: 999px;
  padding: 13px 22px;
  border: 2px solid transparent;
  cursor: pointer;
}
.btn-primary { background: var(--navy); color: #fff; }
.btn-primary:hover { background: var(--flame); color: #fff; }
.btn-secondary { background: #fff; color: var(--navy); border-color: var(--navy); }
.btn-secondary:hover { background: var(--blue-soft); color: var(--navy); }
.btn[disabled], .btn.is-disabled {
  background: #9aa8b8;
  border-color: #9aa8b8;
  color: #fff;
  cursor: not-allowed;
  pointer-events: none;
}
.btn-ghost { background: transparent; color: var(--navy); border-color: var(--line); }

.trust {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  padding: 0;
  margin: 0;
  list-style: none;
  font-size: 13.5px;
  color: var(--muted);
}
.trust li { display: flex; align-items: center; gap: 8px; }
.trust li::before {
  content: "";
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--blue);
  flex-shrink: 0;
}

.hero-photo {
  max-width: 560px;
  margin: 0 auto 0 0;
  /* Match .eyebrow height (13px × 1.55) + 10px margin so the label meets the H1 */
  padding-top: calc(13px * 1.55 + 10px);
  background: none;
  box-shadow: none;
  overflow: visible;
}
.hero-photo figcaption {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--navy);
  margin: 0;
  line-height: 1.25;
  text-align: left;
  grid-column: 1;
  grid-row: 1;
  align-self: end;
}
.hero-photo-pair {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: auto auto;
  column-gap: 8px;
  row-gap: 8px;
  align-items: stretch;
}
.hero-photo-pair picture {
  display: block;
  min-width: 0;
  grid-row: 2;
}
.hero-photo-pair img {
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 4;
  object-fit: cover;
  object-position: center;
  display: block;
  border-radius: 14px;
  box-shadow: var(--shadow);
  background: #e8e8e8;
}
.hero-photo-note {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--navy);
  margin: 8px 0 0;
  line-height: 1.35;
  text-align: center;
  max-width: 100%;
}

section { padding: 72px 0; }
.section-alt { background: #fff; }
.section-blue { background: var(--blue-soft); }
.section-navy { background: var(--navy); color: #fff; }
.section-navy h2, .section-navy h3 { color: #fff; }
.kicker {
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--flame);
  margin: 0 0 8px;
}

#how-it-works .kicker {
  font-size: 39px;
  letter-spacing: 0.08em;
  line-height: 1.1;
  margin: 0 0 16px;
}


h2 { font-size: clamp(28px, 3.4vw, 40px); line-height: 1.15; margin: 0 0 16px; }
h3 { font-size: 22px; margin: 0 0 8px; }
.intro { font-size: 18px; max-width: 40rem; margin: 0 0 32px; color: var(--muted); }
.section-navy .intro { color: var(--blue-mid); }

.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin: 0 0 24px;
}
.step {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px 22px 22px;
  box-shadow: var(--shadow);
}
.step-num {
  font-family: var(--font-serif);
  font-size: 34px;
  color: var(--blue);
  font-weight: 600;
  line-height: 1;
  margin-bottom: 10px;
}
.note {
  background: var(--blue-soft);
  border-left: 4px solid var(--navy);
  padding: 14px 16px;
  border-radius: 0 12px 12px 0;
  font-size: 16px;
  margin: 0;
}

.fail-safe-line {
  font-size: 18px;
  line-height: 1.4;
  margin: 0 0 16px;
  color: var(--ink);
}
.fail-safe-line strong {
  font-weight: 700;
}

.benefit-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}
.benefit {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px 22px 22px;
  box-shadow: var(--shadow);
}
.benefit h3 { font-size: 22px; }
.benefit p { margin: 0; color: var(--muted); }

.checklist {
  display: grid;
  gap: 10px;
  margin: 0 0 20px;
  padding: 0;
  list-style: none;
}
.checklist li {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 14px 16px 14px 48px;
  position: relative;
}
.checklist li::before {
  content: "";
  position: absolute;
  left: 16px; top: 16px;
  width: 18px; height: 18px;
  border: 2px solid var(--navy);
  border-radius: 4px;
  background: var(--blue-soft);
}
.checklist li::after {
  content: "";
  position: absolute;
  left: 21px; top: 18px;
  width: 6px; height: 11px;
  border: solid var(--navy);
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
}
.fit-yes, .fit-no {
  font-weight: 700;
  margin: 16px 0 0;
}
.fit-yes { color: var(--ok); }
.fit-no { color: var(--flame-dark); }

.fit-afue-copy { min-width: 0; }
.fit-afue-note {
  display: block;
  margin: 6px 0 0;
  font-size: 14px;
  font-weight: 400;
  line-height: 1.45;
  color: var(--muted);
}
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
  align-items: start;
}
.card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
}
.card-body { padding: 22px 22px 24px; }
#included .card > img,
#included .card > picture,
#included .card > picture img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: contain;
  object-position: center;
}

.card-body p { margin: 0 0 10px; color: var(--muted); }
.card-body p:last-child { margin-bottom: 0; }
.included-label {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  background: var(--navy);
  color: #fff;
  border-radius: 999px;
  padding: 4px 10px;
  margin-bottom: 10px;
}
.included-label.separate { background: #e04010; }

.safety-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
.safety-item {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 18px 18px 16px;
}
.safety-item h3 { font-size: 18px; }

.faq-list { display: grid; gap: 10px; max-width: 800px; }
details.faq {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 0 18px;
}
details.faq summary {
  cursor: pointer;
  font-weight: 700;
  color: var(--navy);
  padding: 16px 0;
  list-style: none;
  display: flex;
  justify-content: space-between;
  gap: 16px;
}
details.faq summary::-webkit-details-marker { display: none; }
details.faq summary::after { content: "+"; font-weight: 500; font-size: 22px; color: var(--muted); }
details.faq[open] summary::after { content: "–"; }
details.faq p { margin: 0 0 16px; color: var(--muted); }
details.faq ol {
  margin: 0 0 16px;
  padding-left: 1.25em;
  color: var(--muted);
}
details.faq li { margin: 0 0 8px; }
details.faq li:last-child { margin-bottom: 0; }
details.faq li strong { color: var(--ink); }

.buy-box {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 32px;
  align-items: start;
  background: #fff;
  color: var(--ink);
  border-radius: 24px;
  padding: 32px;
  box-shadow: var(--shadow);
}
.price {
  font-family: var(--font-serif);
  font-size: 48px;
  color: var(--navy);
  margin: 8px 0;
  line-height: 1;
}
.price-note { color: var(--muted); margin: 0 0 16px; font-size: 15px; }
.buy-list { margin: 0 0 20px; padding-left: 18px; color: var(--muted); }
.buy-list li { margin: 0 0 6px; }
.buy-photo { margin: 0; }
.buy-photo figcaption {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--navy);
  margin: 0 0 8px;
  line-height: 1.25;
}
.buy-box img, .buy-photo img {
  width: 100%;
  height: auto;
  object-fit: contain;
  border-radius: 16px;
  display: block;
}
.nudge { font-style: italic; color: var(--navy); margin: 12px 0 0; }
details.faq summary > span { flex: 1; padding-right: 8px; }

.site-footer {
  background: var(--navy-deep);
  color: var(--blue-mid);
  padding: 40px 0 28px;
  font-size: 14px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 28px;
  margin-bottom: 28px;
}
.site-footer a { color: #fff; text-decoration: none; }
.site-footer a:hover { color: var(--blue); }
.site-footer h2 { font-size: 16px; font-family: var(--font-sans); letter-spacing: 0.06em; text-transform: uppercase; color: #fff; margin: 0 0 10px; }
.site-footer ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 6px; }
.legal { border-top: 1px solid rgba(142, 205, 246, 0.2); padding-top: 16px; color: #8aa4bf; font-size: 13px; }
.footer-logo { width: 64px; height: 64px; margin-bottom: 10px; }

.page-hero { padding: 48px 0 20px; background: #fff; }

.parts-page-title {
  margin: 0 0 28px;
}
.parts-page-title h1 {
  margin: 0;
}


.page-hero p { max-width: 40rem; color: var(--muted); font-size: 18px; }

.about-story { padding-top: 12px; }
#about { scroll-margin-top: calc(var(--header-h) + 12px); }
#safety-limits { scroll-margin-top: calc(var(--header-h) + 12px); }
#faq { scroll-margin-top: calc(var(--header-h) + 12px); }
#buy { scroll-margin-top: calc(var(--header-h) + 12px); }
.about-split {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 40px;
  align-items: center;
}
.about-intro {
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr);
  gap: 28px 40px;
  align-items: start;
  margin: 8px 0 40px;
}
.about-portrait {
  margin: 0;
}
.about-portrait picture {
  display: block;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
  background: #ececec;
}
.about-portrait img {
  width: 100%;
  height: auto;
  display: block;
  aspect-ratio: 1;
  object-fit: cover;
}
.about-portrait figcaption {
  margin-top: 10px;
  color: var(--muted);
  font-size: 15px;
  text-align: center;
}
.about-copy p { margin: 0 0 16px; }
.about-copy p:last-child { margin-bottom: 0; }
.about-photo {
  margin: 0 auto;
  max-width: 26rem;
}
.about-photo picture {
  display: block;
  width: 100%;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
  background: #ececec;
}
.about-photo img { width: 100%; display: block; }
.about-photo figcaption {
  margin-top: 10px;
  color: var(--muted);
  font-size: 15px;
  text-align: center;
}


.install-video-section { padding: 0 0 12px; background: #fff; }
.install-video {
  max-width: 22rem;
  margin: 0 auto 28px;
  text-align: center;
}
.install-video video {
  display: block;
  width: 100%;
  max-height: min(70vh, 640px);
  height: auto;
  object-fit: contain;
  border-radius: 16px;
  background: #0f1720;
  box-shadow: var(--shadow);
}
.install-video figcaption,
.install-real figcaption {
  margin-top: 10px;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.45;
}

.install-real {
  max-width: 28rem;
  margin: 0 auto 28px;
  text-align: center;
}
.install-real img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 16px;
  box-shadow: var(--shadow);
  background: #f3f4f6;
}

.intake-guide {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 16px 20px;
  align-items: center;
  margin: 0 0 18px;
}
.intake-guide p {
  margin: 0;
  color: var(--muted);
  font-size: 18px;
  max-width: 40rem;
  line-height: 1.45;
}
.intake-guide-thumb { margin: 0; }
.intake-guide-thumb figcaption {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--navy);
  margin: 0 0 6px;
  line-height: 1.3;
}
.intake-guide-thumb img {
  width: 140px;
  height: auto;
  border-radius: 8px;
  display: block;
}

/* Install picker */
.picker {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin: 8px 0 28px;
}
.picker-btn {
  appearance: none;
  background: #fff;
  border: 2px solid var(--line);
  border-radius: 18px;
  padding: 22px 18px;
  text-align: left;
  cursor: pointer;
  font: inherit;
  color: var(--ink);
  box-shadow: var(--shadow);
}
.picker-btn strong {
  display: block;
  font-family: var(--font-serif);
  font-size: 22px;
  line-height: 1.25;
  color: var(--navy);
  margin-bottom: 6px;
}
.picker-btn:hover { border-color: var(--blue); }
.picker-btn[aria-pressed="true"] {
  border-color: var(--navy);
  background: var(--blue-soft);
  box-shadow: 0 0 0 3px rgba(1, 37, 85, 0.12);
}
.parts-panel { display: none; }
.parts-panel.is-open { display: block; }
.parts-table-wrap { overflow-x: auto; margin: 0 0 24px; }
table.parts {
  width: 100%;
  border-collapse: collapse;
  background: #fff;
  border-radius: 12px;
  overflow: hidden;
  font-size: 15px;
}
table.parts th, table.parts td {
  text-align: left;
  padding: 12px 14px;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}
table.parts th { background: var(--navy); color: #fff; font-weight: 600; }
table.parts tr:last-child td { border-bottom: 0; }
.store-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  margin: 0 0 28px;
}
.store-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 16px;
}
.store-card h4 { margin: 0 0 6px; font-size: 16px; font-family: var(--font-sans); color: var(--navy); }
.store-card p { margin: 0 0 8px; font-size: 14px; color: var(--muted); }
.store-card .price-line { font-weight: 700; color: var(--navy); font-size: 14px; }
a.store-link {
  display: inline-block;
  margin-top: 8px;
  font-weight: 700;
  text-decoration: none;
  background: var(--navy);
  color: #fff;
  padding: 8px 12px;
  border-radius: 999px;
  font-size: 14px;
}
a.store-link:hover { background: var(--flame); color: #fff; }

.tools-subhead {
  font-family: var(--font-serif);
  font-size: 22px;
  font-weight: 600;
  color: var(--navy);
  margin: 8px 0 16px;
  letter-spacing: -0.02em;
}

.part-card {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 20px;
  align-items: center;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px;
  box-shadow: var(--shadow);
  margin: 0 0 24px;
}
.part-card-photo {
  margin: 0;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 12px;
  overflow: hidden;
}
.part-card-photo img { width: 100%; height: auto; display: block; }
.part-card-body h3 { font-size: 20px; margin: 0 0 8px; }
.part-card-body p { margin: 0 0 10px; color: var(--muted); font-size: 15px; }
.part-card-links { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 6px; }
.part-card-links .store-link { margin-top: 0; }

.part-card-photos {
  display: grid;
  grid-template-columns: 1.7fr auto 1fr;
  gap: 8px 6px;
  align-self: start;
  align-items: center;
}
.part-card-plus {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 3.75rem;
  line-height: 1;
  color: var(--navy);
  align-self: center;
  user-select: none;
  pointer-events: none;
}
.part-card-with-pair {
  grid-template-columns: minmax(300px, 520px) 1fr;
}
.part-card-photo-tees figcaption {
  letter-spacing: 0.01em;
  font-weight: 600;
  font-size: 13px;
  line-height: 1.4;
  padding: 8px 10px 12px;
}
.part-link-rows {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 20px 12px;
  margin-top: 12px;
  align-items: start;
}
.part-link-heading {
  grid-column: 1 / -1;
  font-size: 13px;
  font-weight: 700;
  color: var(--navy);
  margin: 0;
}
.part-link-group {
  display: grid;
  grid-template-columns: subgrid;
  grid-column: 1 / -1;
  gap: 8px 12px;
  align-items: start;
}
.part-link-label,
.part-link-note {
  font-size: 13px;
  font-weight: 700;
  color: var(--navy);
  line-height: 1.35;
  padding-top: 8px;
  white-space: nowrap;
}
.part-link-note { color: var(--muted); }
.part-link-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  min-width: 0;
}
.part-link-rows .store-link { margin-top: 0; }
.part-card-photo figcaption {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.03em;
  color: var(--navy);
  margin: 0;
  padding: 8px 8px 10px;
  text-align: center;
  line-height: 1.3;
}

.install-instructions {
  scroll-margin-top: calc(var(--header-h) + 12px);
  margin-top: 12px;
  padding-top: 12px;
}
.install-instructions h2 {
  margin-top: 8px;
}
#what-youll-need,
#pipe-size,
#tools,
#which-pipe-is-the-intake {
  scroll-margin-top: calc(var(--header-h) + 12px);
}
.intake-id {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 24px 26px 20px;
  margin: 0 0 28px;
}
.intake-id h2 { margin: 0 0 8px; }
.intake-id > p {
  margin: 0 0 14px;
  color: var(--muted);
  font-size: 16px;
  max-width: 42rem;
}
.intake-id ol {
  margin: 0;
  padding-left: 1.3em;
  color: var(--muted);
  font-size: 16px;
  max-width: 46rem;
}
.intake-id li { margin: 0 0 10px; }
.intake-id li:last-child { margin-bottom: 0; }
.intake-id li strong {
  color: var(--ink);
  font-weight: 700;
}

.install-steps {
  display: grid;
  gap: 16px;
  margin: 8px 0 28px;
}
.install-steps .step h3 {
  margin: 0 0 8px;
  font-size: 20px;
}
.install-steps .step p { margin: 0; color: var(--muted); font-size: 16px; }
.install-steps .step p + p { margin-top: 8px; }

.aisle-note {
  background: var(--tbd-bg);
  border-radius: 10px;
  padding: 8px 10px;
  font-size: 13px;
  color: var(--tbd-ink);
  margin: 8px 0 0;
}
.warn {
  background: #fff6f2;
  border: 1px solid #f3c2b2;
  border-radius: 14px;
  padding: 18px 20px;
  margin: 24px 0;
}
.warn h3 { color: var(--flame-dark); }

.form {
  display: grid;
  gap: 14px;
  max-width: 520px;
}
label { font-weight: 600; font-size: 14px; color: var(--navy); display: grid; gap: 6px; }
input, textarea, select {
  font: inherit;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #fff;
  color: var(--ink);
}
.form-note {
  background: var(--tbd-bg);
  border: 1px solid var(--tbd-line);
  border-radius: 12px;
  padding: 14px 16px;
  color: var(--tbd-ink);
}

.form-result {
  margin: 4px 0 0;
  color: var(--navy);
  font-size: 15px;
}

.modal {
  position: fixed;
  inset: 0;
  background: rgba(1, 37, 85, 0.55);
  display: none;
  align-items: center;
  justify-content: center;
  padding: 20px;
  z-index: 80;
}
.modal.is-open { display: flex; }
.modal-card {
  background: #fff;
  border-radius: 20px;
  padding: 28px;
  max-width: 440px;
  width: 100%;
  box-shadow: var(--shadow);
}
.modal-card h2 { font-size: 28px; }


@media (max-width: 1100px) {
  .brand-name { display: none; }
}
@media (max-width: 860px) {
  .intake-id { padding: 20px 18px 16px; }
  .part-card-photo { max-width: 200px; }
  .part-card-photos { max-width: 520px; grid-template-columns: 1fr; }
  .part-card-photos .part-card-photo { max-width: none; }
  .part-card-plus {
    justify-self: center;
    font-size: 3.25rem;
    padding: 2px 0 4px;
  }
  .part-link-rows,
  .part-link-group { grid-template-columns: 1fr; gap: 6px; }
  .part-link-label,
  .part-link-note { padding-top: 0; }
  .menu-toggle { display: inline-flex; }
  .nav {
    display: none;
    position: absolute;
    top: calc(var(--header-h) + 41px);
    left: 0; right: 0;
    background: #fff;
    border-bottom: 1px solid var(--line);
    flex-direction: column;
    align-items: stretch;
    padding: 10px 16px 16px;
  }
  .nav.is-open { display: flex; }
  .nav a { padding: 12px 14px; white-space: normal; font-size: 16px; }
  .nav .nav-buy { margin-left: 0; margin-top: 6px; text-align: center; }
  .hero-grid, .steps, .split, .safety-grid, .benefit-grid, .buy-box, .footer-grid, .picker, .store-grid, .about-split, .about-intro, .part-card, .part-card-with-pair {
    grid-template-columns: 1fr;
  }
  .about-intro {
    justify-items: center;
    gap: 20px;
    margin-bottom: 32px;
  }
  .about-portrait {
    width: min(200px, 62vw);
  }
  .about-copy { justify-self: stretch; }
  .about-photo { max-width: 22rem; }
  .hero-grid {
    grid-template-areas:
      "intro"
      "photo"
      "offer";
    gap: 16px;
  }
  .hero-copy { display: contents; }
  .hero-intro { grid-area: intro; }
  .hero-photo { grid-area: photo; width: 100%; margin: 0 auto; max-width: 100%; padding-top: 0; }
  .hero-photo figcaption {
    font-size: 11px;
    letter-spacing: 0.02em;
  }
  .hero-photo-note {
    font-size: 11px;
    letter-spacing: 0.02em;
    margin-top: 6px;
    padding: 0 4px;
  }
  .hero-photo-pair {
    column-gap: 6px;
    row-gap: 6px;
  }
  .hero-photo-pair img {
    max-height: none;
    width: 100%;
    height: auto;
    aspect-ratio: 3 / 4;
    object-fit: cover;
    display: block;
    margin: 0;
    border-radius: 10px;
  }
  .hero-offer {
    grid-area: offer;
    display: flex;
    flex-direction: column;
  }
  .hero-offer .lede { order: 1; }
  .hero-offer .hero-pipes { order: 1; }
  .hero-offer .actions { order: 2; }
  .hero-offer .trust { order: 3; }
  .hero { padding: 28px 0 36px; }
  .hero-hook { margin-top: 10px; font-size: clamp(20px, 6vw, 26px); }
  .hero-offer { margin-top: 14px; }
  .hero-footnote { margin-top: 16px; }
  .subhead { margin-bottom: 8px; }
  section { padding: 48px 0; }
  .kicker { font-size: 16px; }
  #how-it-works .kicker { font-size: 30px; margin: 0 0 12px; }
  .buy-box { padding: 22px; }
  .brand-name { display: none; }
}

@media (max-width: 480px) {
  .wrap { width: calc(100% - 28px); }
  .lede { font-size: 17px; }
  .actions .btn { width: 100%; }
}

/* Tighter gap between How it works and What's in the package */
#how-it-works { padding-bottom: 28px; }
#included { padding-top: 28px; }
@media (max-width: 720px) {
  #how-it-works { padding-bottom: 20px; }
  #included { padding-top: 20px; }
}


/* Canada shipping link under the main Buy button */
.buy-cta {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 8px;
}
.canada-ship-link {
  font-size: 14px;
  font-weight: 600;
  color: var(--muted);
  text-decoration: underline;
  text-underline-offset: 3px;
  padding: 0 6px;
}
.canada-ship-link:hover { color: var(--navy); }

.shipping-block {
  margin-top: 22px;
  padding: 16px 18px;
  background: var(--blue-soft);
  border-radius: 12px;
  border-left: 4px solid var(--navy);
}
.shipping-block h3 { font-size: 18px; margin: 0 0 8px; }
.shipping-block p { margin: 0 0 8px; color: var(--muted); font-size: 15px; }
.shipping-block p:last-child { margin-bottom: 0; }


.buy-box h2, .buy-box h3 { color: var(--navy); }
.buy-photos { display: grid; gap: 20px; }

.step-figure { margin: 14px 0 0; }
.step-figure img {
  width: 100%;
  max-width: 520px;
  height: auto;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: #fff;
}
.step-figure figcaption {
  margin: 8px 0 0;
  font-size: 14px;
  color: var(--ink);
  max-width: 36rem;
}
.step-figure .cap-yes { font-weight: 700; color: var(--navy); }
.step-figure .cap-no { font-weight: 700; color: var(--flame-dark); }

/* Real back/front glue photos: two columns on desktop, stacked (front below back) on mobile */
.glue-pair {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin: 14px 0 0;
  max-width: 860px;
}
.glue-pair figure { margin: 0; }
.glue-pair img {
  width: 100%;
  max-width: none;
  height: auto;
  aspect-ratio: 1100 / 1200;
  object-fit: cover;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: #fff;
  display: block;
}
.glue-pair figcaption {
  margin: 8px 0 0;
  font-size: 14px;
  font-weight: 700;
  text-align: center;
}
.glue-pair .cap-yes { font-weight: 700; color: var(--navy); }
.glue-pair .cap-no { font-weight: 700; color: var(--flame-dark); }
@media (max-width: 700px) {
  .glue-pair { grid-template-columns: 1fr; }
}
.orient-figure img { max-width: 640px; }

@media (max-width: 480px) {
  .buy-cta { width: 100%; }
  .buy-cta .btn { width: 100%; }
}

/* Closed / open damper pair on How it works */
.state-pair {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin: 8px 0 24px;
  max-width: 680px;
}
.state-pair figure { margin: 0; }
.state-pair img {
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: #fff;
  display: block;
}
.state-pair figcaption {
  font-size: 14px;
  font-weight: 700;
  color: var(--navy);
  margin: 8px 0 0;
  text-align: center;
}
.faq-photo {
  margin: 8px 0 16px;
  max-width: 320px;
}
.faq-photo img {
  width: 100%;
  height: auto;
  border-radius: 12px;
  border: 1px solid var(--line);
  display: block;
}
.faq-photo figcaption {
  font-size: 13px;
  color: var(--muted);
  margin: 6px 0 0;
}
@media (max-width: 480px) {
  .state-pair { gap: 10px; }
  .state-pair figcaption { font-size: 13px; }
}

.state-pair .state-label {
  font-size: 14px;
  font-weight: 700;
  color: var(--navy);
  text-align: center;
  margin: 0 0 8px;
}