/* FRAVONEX shared site styles — mobile first */
:root {
  --navy: #1f3864;
  --navy-dark: #12284f;
  --navy-soft: #edf2f8;
  --red: #c0392b;
  --red-dark: #a72f23;
  --gold: #c9a24b;
  --ink: #172033;
  --muted: #5e6879;
  --line: #dce2ea;
  --white: #ffffff;
  --off-white: #f7f9fc;
  --shadow: 0 18px 44px rgba(18, 40, 79, 0.1);
  --radius: 4px;
  --max: 1180px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--white);
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, Helvetica, sans-serif;
  font-size: 1rem;
  line-height: 1.65;
  text-rendering: optimizeLegibility;
}

body::before {
  content: "";
  display: block;
  height: 4px;
  background: linear-gradient(90deg, var(--navy) 0 72%, var(--red) 72% 100%);
}

img {
  display: block;
  max-width: 100%;
}

a {
  color: inherit;
  text-underline-offset: 0.2em;
}

button,
input,
select,
textarea {
  font: inherit;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

:focus-visible {
  outline: 3px solid rgba(192, 57, 43, 0.32);
  outline-offset: 3px;
}

.skip-link {
  position: fixed;
  z-index: 1000;
  top: 0.7rem;
  left: 0.7rem;
  padding: 0.7rem 1rem;
  transform: translateY(-160%);
  border-radius: var(--radius);
  color: var(--white);
  background: var(--navy);
  font-weight: 800;
}

.skip-link:focus {
  transform: translateY(0);
}

.container {
  width: min(calc(100% - 2rem), var(--max));
  margin-inline: auto;
}

.site-header {
  position: sticky;
  z-index: 100;
  top: 0;
  border-bottom: 1px solid rgba(31, 56, 100, 0.16);
  background: rgba(255, 255, 255, 0.97);
  box-shadow: 0 4px 18px rgba(18, 40, 79, 0.04);
  backdrop-filter: blur(12px);
}

.header-inner {
  min-height: 4.75rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  display: inline-flex;
  align-items: flex-start;
  color: var(--navy);
  text-decoration: none;
  font-family: "Arial Narrow", "Roboto Condensed", Impact, sans-serif;
  font-size: clamp(1.45rem, 7vw, 2.05rem);
  font-weight: 900;
  letter-spacing: -0.045em;
  line-height: 1;
}

.brand-x {
  color: var(--red);
}

.brand-mark {
  margin: -0.05em 0 0 0.08em;
  font-family: Arial, Helvetica, sans-serif;
  font-size: 0.3em;
  letter-spacing: 0;
}

.menu-toggle {
  width: 2.75rem;
  height: 2.75rem;
  display: inline-grid;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--navy);
  background: var(--white);
  cursor: pointer;
}

.menu-lines,
.menu-lines::before,
.menu-lines::after {
  width: 1.25rem;
  height: 2px;
  display: block;
  background: currentColor;
  transition: transform 180ms ease, opacity 180ms ease;
}

.menu-lines {
  position: relative;
}

.menu-lines::before,
.menu-lines::after {
  content: "";
  position: absolute;
  left: 0;
}

.menu-lines::before {
  top: -0.4rem;
}

.menu-lines::after {
  top: 0.4rem;
}

.menu-toggle[aria-expanded="true"] .menu-lines {
  background: transparent;
}

.menu-toggle[aria-expanded="true"] .menu-lines::before {
  top: 0;
  transform: rotate(45deg);
}

.menu-toggle[aria-expanded="true"] .menu-lines::after {
  top: 0;
  transform: rotate(-45deg);
}

.site-nav {
  position: absolute;
  inset: 100% 0 auto;
  display: none;
  padding: 0.6rem 1rem 1rem;
  border-bottom: 3px solid var(--red);
  background: var(--white);
  box-shadow: 0 20px 30px rgba(18, 40, 79, 0.14);
}

.site-nav.is-open {
  display: block;
}

.site-nav ul {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0;
  list-style: none;
}

.site-nav a {
  display: block;
  padding: 0.85rem 0.75rem;
  border-bottom: 1px solid var(--line);
  color: var(--navy);
  text-decoration: none;
  font-size: 0.82rem;
  font-weight: 850;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.site-nav a:hover,
.site-nav a[aria-current="page"] {
  color: var(--red);
}

.site-nav a[aria-current="page"] {
  box-shadow: inset 3px 0 0 var(--red);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  margin: 0 0 1.1rem;
  color: var(--red);
  font-size: 0.74rem;
  font-weight: 900;
  letter-spacing: 0.14em;
  line-height: 1.35;
  text-transform: uppercase;
}

.eyebrow::before {
  content: "";
  width: 2.25rem;
  height: 3px;
  background: var(--red);
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1,
h2,
h3 {
  color: var(--navy);
  line-height: 1.06;
}

h1,
h2,
.display-type {
  font-family: "Arial Narrow", "Roboto Condensed", Impact, sans-serif;
  font-weight: 900;
  letter-spacing: -0.02em;
  text-transform: uppercase;
}

h1 {
  margin-bottom: 1.25rem;
  font-size: clamp(2.75rem, 12vw, 6rem);
}

h2 {
  margin-bottom: 1rem;
  font-size: clamp(2rem, 8vw, 3.65rem);
}

h3 {
  margin-bottom: 0.65rem;
  font-size: clamp(1.15rem, 5vw, 1.55rem);
}

.lead {
  color: #3d485a;
  font-size: clamp(1.05rem, 3vw, 1.26rem);
  line-height: 1.65;
}

.hero {
  position: relative;
  overflow: hidden;
  border-bottom: 5px solid var(--navy);
  background:
    linear-gradient(135deg, rgba(31, 56, 100, 0.045), transparent 46%),
    var(--white);
}

.hero::after {
  content: "";
  position: absolute;
  right: -7rem;
  bottom: -7rem;
  width: 18rem;
  height: 18rem;
  border: 1px solid rgba(201, 162, 75, 0.35);
  border-radius: 50%;
  pointer-events: none;
}

.hero-grid {
  display: grid;
  gap: 2.25rem;
  padding-block: clamp(3.25rem, 8vw, 6rem);
}

.hero-copy {
  position: relative;
  z-index: 1;
}

.hero-copy h1 {
  max-width: 12ch;
  font-size: clamp(2.8rem, 10vw, 5.35rem);
}

.hero-copy h1 .red-word {
  display: inline;
  color: var(--red);
}

.hero-copy .lead {
  max-width: 34rem;
}

.hero-media {
  min-height: clamp(25rem, 90vw, 36rem);
  border-top: 5px solid var(--navy);
  border-right: 5px solid var(--red);
  box-shadow: 16px 16px 0 var(--navy-soft), var(--shadow);
}

.hero-media img {
  object-position: 66% center;
}

.hero-media::after {
  width: 55%;
  height: 8px;
}

.hero-actions,
.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.75rem;
}

.button {
  min-height: 3rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.55rem;
  padding: 0.78rem 1.15rem;
  border: 2px solid var(--red);
  border-radius: 2px;
  color: var(--white);
  background: var(--red);
  box-shadow: 4px 4px 0 var(--navy);
  text-align: center;
  text-decoration: none;
  font-size: 0.79rem;
  font-weight: 900;
  letter-spacing: 0.055em;
  line-height: 1.25;
  text-transform: uppercase;
  transition: transform 160ms ease, box-shadow 160ms ease, background 160ms ease;
}

.button:hover {
  transform: translate(2px, 2px);
  background: var(--red-dark);
  box-shadow: 2px 2px 0 var(--navy);
}

.button-secondary {
  border-color: var(--navy);
  color: var(--navy);
  background: var(--white);
  box-shadow: 4px 4px 0 var(--gold);
}

.button-secondary:hover {
  color: var(--white);
  background: var(--navy);
  box-shadow: 2px 2px 0 var(--gold);
}

.cert-badge {
  display: inline-grid;
  grid-template-columns: auto 1fr;
  align-items: center;
  gap: 0.7rem;
  margin-top: 1.6rem;
  padding: 0.75rem 0.9rem;
  border-left: 3px solid var(--gold);
  color: var(--navy);
  background: var(--navy-soft);
  font-size: 0.78rem;
  font-weight: 800;
  line-height: 1.4;
}

.cert-seal {
  width: 2.25rem;
  height: 2.25rem;
  display: grid;
  place-items: center;
  border: 2px solid currentColor;
  border-radius: 50%;
  font-size: 0.67rem;
  font-weight: 950;
}

.media-slot {
  position: relative;
  min-height: 19rem;
  overflow: hidden;
  margin: 0;
  border: 1px solid rgba(31, 56, 100, 0.22);
  border-radius: var(--radius);
  background:
    linear-gradient(135deg, rgba(31, 56, 100, 0.97), rgba(18, 40, 79, 0.9)),
    var(--navy);
  box-shadow: var(--shadow);
}

.media-slot::before,
.media-slot::after {
  content: "";
  position: absolute;
  z-index: 1;
}

.media-slot::before {
  inset: 1rem;
  border: 1px solid rgba(255, 255, 255, 0.25);
}

.media-slot::after {
  right: 0;
  bottom: 0;
  width: 40%;
  height: 6px;
  background: var(--red);
}

.media-slot img {
  position: absolute;
  z-index: 2;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media-slot.is-missing img {
  display: none;
}

.slot-copy {
  position: absolute;
  z-index: 1;
  inset: 0;
  display: grid;
  place-content: center;
  gap: 0.35rem;
  padding: 2rem;
  color: var(--white);
  text-align: center;
}

.slot-copy strong {
  font-family: "Arial Narrow", "Roboto Condensed", Impact, sans-serif;
  font-size: 1.35rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.slot-copy code {
  color: #dce6f4;
  font-size: 0.74rem;
}

.section {
  padding-block: clamp(4rem, 9vw, 7rem);
}

.section-compact {
  padding-block: clamp(3rem, 7vw, 5rem);
}

.section-navy {
  position: relative;
  color: var(--white);
  background: var(--navy);
}

.section-navy::before {
  content: "";
  position: absolute;
  inset: 0 0 auto;
  height: 4px;
  background: linear-gradient(90deg, var(--red) 0 18%, var(--gold) 18% 23%, transparent 23%);
}

.section-navy h2,
.section-navy h3,
.section-navy .lead {
  color: var(--white);
}

.section-soft {
  background: var(--off-white);
}

.section-heading {
  max-width: 46rem;
  margin-bottom: 2.5rem;
}

.section-heading p:last-child {
  margin-bottom: 0;
}

.intro-grid,
.product-detail,
.guide-grid,
.warranty-grid,
.register-grid {
  display: grid;
  gap: 2rem;
}

.brand-statement {
  padding: 1.5rem;
  border-top: 4px solid var(--red);
  border-bottom: 1px solid var(--gold);
  background: var(--white);
  box-shadow: var(--shadow);
}

.brand-statement p:last-child {
  margin-bottom: 0;
}

.fact-grid,
.feature-grid,
.trust-grid,
.product-grid,
.spec-grid,
.coverage-grid {
  display: grid;
  gap: 1rem;
}

.feature-card,
.trust-card,
.fact-card,
.spec-card,
.coverage-card {
  padding: 1.45rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--white);
}

.feature-card {
  position: relative;
  overflow: hidden;
  text-align: center;
}

.feature-card::after {
  content: "";
  position: absolute;
  inset: auto 0 0;
  height: 3px;
  background: var(--navy);
}

.icon-frame {
  position: relative;
  width: 4.35rem;
  height: 4.35rem;
  display: grid;
  place-items: center;
  overflow: hidden;
  margin: 0 auto 1.15rem;
  border: 2px solid var(--navy);
  border-radius: 50%;
  color: var(--navy);
  background: var(--white);
}

.icon-frame img {
  position: relative;
  z-index: 2;
  width: 100%;
  height: 100%;
  object-fit: cover;
  padding: 0;
  background: var(--white);
}

.icon-frame.is-missing img {
  display: none;
}

.icon-fallback {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  font-family: Georgia, serif;
  font-size: 1.65rem;
  font-weight: 700;
}

.feature-card p,
.trust-card p,
.fact-card p,
.spec-card p,
.coverage-card p {
  margin-bottom: 0;
  color: var(--muted);
}

.trust-card {
  border-color: rgba(255, 255, 255, 0.2);
  background: rgba(255, 255, 255, 0.06);
}

.trust-card p {
  color: rgba(255, 255, 255, 0.76);
}

.trust-number {
  display: block;
  margin-bottom: 0.35rem;
  color: var(--white);
  font-family: "Arial Narrow", "Roboto Condensed", Impact, sans-serif;
  font-size: clamp(2.2rem, 8vw, 3.5rem);
  font-weight: 900;
  letter-spacing: -0.03em;
  line-height: 1;
}

.product-card {
  display: grid;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: inherit;
  background: var(--white);
  box-shadow: 0 12px 30px rgba(18, 40, 79, 0.08);
  text-decoration: none;
  transition: transform 180ms ease, box-shadow 180ms ease;
}

.product-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}

.product-card .media-slot {
  min-height: 15rem;
  border: 0;
  border-radius: 0;
  box-shadow: none;
}

.product-card-copy {
  position: relative;
  padding: 1.5rem;
}

.product-code {
  display: inline-block;
  margin-bottom: 0.7rem;
  color: var(--red);
  font-size: 0.73rem;
  font-weight: 900;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}

.text-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--navy);
  font-size: 0.78rem;
  font-weight: 900;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.text-link::after {
  content: "→";
  color: var(--red);
  font-size: 1.15rem;
  transition: transform 160ms ease;
}

.product-card:hover .text-link::after {
  transform: translateX(0.25rem);
}

.page-hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(3.5rem, 9vw, 6rem);
  color: var(--white);
  background:
    linear-gradient(110deg, rgba(18, 40, 79, 0.98), rgba(31, 56, 100, 0.92)),
    var(--navy);
}

.page-hero::after {
  content: "";
  position: absolute;
  inset: auto 0 0;
  height: 6px;
  background: linear-gradient(90deg, var(--red) 0 30%, var(--gold) 30% 34%, rgba(255, 255, 255, 0.16) 34%);
}

.page-hero h1,
.page-hero .lead {
  max-width: 56rem;
  color: var(--white);
}

.page-hero h1 {
  font-size: clamp(2.7rem, 10vw, 5.2rem);
}

.page-hero-compact {
  padding-block: clamp(3rem, 7vw, 4.8rem);
}

.page-hero-compact h1 {
  margin-bottom: 0.85rem;
  font-size: clamp(2.65rem, 8vw, 4.55rem);
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin-bottom: 1rem;
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.breadcrumb a:hover {
  color: var(--white);
}

.product-detail + .product-detail {
  margin-top: clamp(4rem, 9vw, 7rem);
  padding-top: clamp(4rem, 9vw, 7rem);
  border-top: 1px solid var(--gold);
}

.product-detail .media-slot {
  min-height: 22rem;
}

.spec-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-block: 1.5rem;
}

.spec-card {
  padding: 1rem;
  border-top: 3px solid var(--navy);
}

.spec-label {
  display: block;
  margin-bottom: 0.2rem;
  color: var(--muted);
  font-size: 0.7rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.spec-value {
  color: var(--navy);
  font-weight: 900;
}

.check-list,
.step-list,
.plain-list {
  margin: 1.2rem 0 0;
  padding: 0;
  list-style: none;
}

.check-list li,
.plain-list li {
  position: relative;
  padding: 0.55rem 0 0.55rem 1.7rem;
  border-bottom: 1px solid var(--line);
}

.check-list li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--red);
  font-weight: 900;
}

.plain-list li::before {
  content: "—";
  position: absolute;
  left: 0;
  color: var(--gold);
  font-weight: 900;
}

.cert-strip {
  padding: 1.25rem 0;
  color: var(--white);
  background: var(--red);
  text-align: center;
  font-weight: 850;
}

.cert-strip p {
  margin: 0;
}

.install-center-section {
  background:
    linear-gradient(135deg, rgba(31, 56, 100, 0.035), transparent 46%),
    var(--off-white);
}

.install-selector-layout {
  display: grid;
  gap: clamp(1.5rem, 4vw, 3rem);
  align-items: start;
}

.install-sidebar {
  position: relative;
  overflow: hidden;
  padding: clamp(1.25rem, 4vw, 1.75rem);
  border-top: 5px solid var(--red);
  color: rgba(255, 255, 255, 0.76);
  background: var(--navy);
  box-shadow: var(--shadow);
}

.install-sidebar::after {
  content: "";
  position: absolute;
  right: -3rem;
  bottom: -3rem;
  width: 8rem;
  height: 8rem;
  border: 1px solid rgba(201, 162, 75, 0.38);
  border-radius: 50%;
  pointer-events: none;
}

.install-sidebar-kicker {
  margin-bottom: 0.45rem;
  color: var(--gold);
  font-size: 0.7rem;
  font-weight: 900;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.install-sidebar h2 {
  margin-bottom: 1.35rem;
  color: var(--white);
  font-size: clamp(1.8rem, 7vw, 2.5rem);
}

.install-center-back {
  position: relative;
  z-index: 1;
  display: inline-block;
  margin-bottom: 1.35rem;
  color: var(--white);
  font-size: 0.72rem;
  font-weight: 900;
  letter-spacing: 0.08em;
  text-decoration: none;
  text-transform: uppercase;
}

.install-center-back:hover {
  color: var(--gold);
}

.install-product-nav {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 0.8rem;
}

.install-product-link {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 0.75rem;
  align-items: center;
  min-height: 5.6rem;
  padding: 0.85rem;
  border: 1px solid rgba(255, 255, 255, 0.18);
  color: var(--navy);
  background: var(--white);
  text-decoration: none;
  transition: transform 160ms ease, border-color 160ms ease, box-shadow 160ms ease;
}

.install-product-link:hover,
.install-product-link.is-current {
  transform: translateX(0.25rem);
  border-color: var(--gold);
  box-shadow: 5px 5px 0 rgba(201, 162, 75, 0.28);
}

.install-product-link.is-current {
  border-left: 5px solid var(--red);
}

.install-product-code {
  width: 3.2rem;
  height: 3.2rem;
  display: grid;
  place-items: center;
  color: var(--white);
  background: var(--navy);
  font-size: 0.7rem;
  font-weight: 950;
  letter-spacing: 0.05em;
}

.install-product-link strong,
.install-product-link small {
  display: block;
}

.install-product-link strong {
  font-size: 0.82rem;
  line-height: 1.25;
}

.install-product-link small {
  margin-top: 0.25rem;
  color: var(--muted);
  font-size: 0.68rem;
  line-height: 1.35;
}

.install-product-arrow {
  color: var(--red);
  font-size: 1.2rem;
  font-weight: 900;
}

.install-future-note {
  position: relative;
  z-index: 1;
  margin: 1.2rem 0 0;
  padding-top: 1rem;
  border-top: 1px solid rgba(255, 255, 255, 0.16);
  font-size: 0.75rem;
  line-height: 1.55;
}

.install-overview,
.guide-detail-card {
  min-width: 0;
}

.install-cover {
  position: relative;
  min-height: clamp(25rem, 70vw, 36rem);
  overflow: hidden;
  margin: 0;
  border: 1px solid rgba(31, 56, 100, 0.2);
  background: var(--navy);
  box-shadow: var(--shadow);
}

.install-cover::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 34%, rgba(18, 40, 79, 0.92) 100%);
}

.install-cover img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

.install-cover-copy {
  position: absolute;
  z-index: 1;
  right: 0;
  bottom: 0;
  left: 0;
  padding: clamp(1.5rem, 5vw, 2.5rem);
  color: var(--white);
}

.install-cover-copy h2,
.install-cover-copy p {
  color: var(--white);
}

.install-cover-copy h2 {
  max-width: 16ch;
  margin-bottom: 0.65rem;
  font-size: clamp(2rem, 7vw, 3.6rem);
}

.install-cover-copy p {
  margin-bottom: 0;
  color: rgba(255, 255, 255, 0.78);
}

.install-cover-label {
  display: inline-block;
  margin-bottom: 0.7rem;
  padding: 0.35rem 0.55rem;
  color: var(--white);
  background: var(--red);
  font-size: 0.67rem;
  font-weight: 900;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.install-start-grid {
  display: grid;
  gap: 1rem;
  margin-top: 1rem;
}

.install-start-grid article {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.85rem;
  padding: 1.1rem;
  border-top: 3px solid var(--navy);
  background: var(--white);
  box-shadow: 0 8px 24px rgba(18, 40, 79, 0.06);
}

.install-start-grid article > span {
  color: var(--red);
  font-family: "Arial Narrow", "Roboto Condensed", Impact, sans-serif;
  font-size: 1.45rem;
  font-weight: 900;
  line-height: 1;
}

.install-start-grid h3 {
  margin-bottom: 0.3rem;
  font-size: 1rem;
}

.install-start-grid p {
  margin-bottom: 0;
  color: var(--muted);
  font-size: 0.78rem;
  line-height: 1.5;
}

.guide-detail-card {
  overflow: hidden;
  border: 1px solid var(--line);
  border-top: 5px solid var(--navy);
  background: var(--white);
  box-shadow: var(--shadow);
}

.guide-detail-media {
  box-shadow: none;
}

.guide-detail-body {
  padding: clamp(1.35rem, 5vw, 2.5rem);
}

.guide-detail-body h2 {
  max-width: 18ch;
}

.guide-rule {
  display: grid;
  gap: 0.35rem;
  margin: 1.6rem 0;
  padding: 1rem 1.15rem;
  border-left: 5px solid var(--gold);
  color: var(--navy);
  background: var(--navy-soft);
}

.guide-rule strong {
  color: var(--red);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.roof-guide .guide-detail-body {
  padding: clamp(1.35rem, 4vw, 2.75rem);
}

.roof-guide .guide-detail-body > h2 {
  max-width: 24ch;
}

.guide-prep-grid {
  display: grid;
  gap: 1rem;
  margin-top: clamp(2rem, 5vw, 3.25rem);
}

.guide-prep-card {
  min-width: 0;
  padding: clamp(1.25rem, 3vw, 1.75rem);
  border: 1px solid var(--line);
  border-top: 4px solid var(--navy);
  background: #f9fafc;
}

.guide-before-card {
  border-top-color: var(--red);
  background: #fffaf9;
}

.guide-section-label {
  margin-bottom: 0.9rem;
  color: var(--red);
  font-size: 0.68rem;
  font-weight: 950;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.guide-inline-list,
.guide-check-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.guide-inline-list {
  display: grid;
  gap: 0.55rem;
}

.guide-inline-list li {
  position: relative;
  padding-left: 1.1rem;
  color: var(--navy);
  font-size: 0.9rem;
  font-weight: 800;
  line-height: 1.45;
}

.guide-inline-list li::before {
  content: "";
  position: absolute;
  top: 0.62em;
  left: 0;
  width: 0.42rem;
  height: 0.42rem;
  background: var(--red);
}

.guide-inline-list small {
  color: var(--muted);
  font-size: 0.76rem;
  font-weight: 650;
}

.guide-equipment-note {
  margin: 1.1rem 0 0;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.77rem;
  line-height: 1.55;
}

.guide-equipment-note strong {
  color: var(--navy);
}

.guide-compatibility {
  margin: 0 0 1rem;
  padding: 0.85rem 1rem;
  border-left: 4px solid var(--red);
  color: var(--navy);
  background: var(--white);
  font-size: 0.82rem;
  line-height: 1.55;
}

.guide-check-list {
  display: grid;
  gap: 0.75rem;
}

.guide-check-list li {
  position: relative;
  padding-left: 1.5rem;
  color: var(--muted);
  font-size: 0.79rem;
  line-height: 1.55;
}

.guide-check-list li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--red);
  font-weight: 950;
}

.installation-sequence {
  margin-top: clamp(3rem, 7vw, 5rem);
}

.installation-sequence-heading {
  margin-bottom: 1.5rem;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--gold);
}

.installation-sequence-heading .guide-section-label {
  margin-bottom: 0.4rem;
}

.installation-sequence-heading h3 {
  max-width: 26ch;
  margin: 0;
  color: var(--navy);
  font-size: clamp(1.45rem, 4vw, 2.15rem);
  line-height: 1.08;
}

.installation-step {
  display: grid;
  min-width: 0;
  overflow: hidden;
  border: 1px solid #d8dee8;
  border-left: 4px solid transparent;
  background: var(--white);
  box-shadow: 0 14px 34px rgba(18, 40, 79, 0.07);
  scroll-margin-top: 7rem;
  transition: border-color 180ms ease, box-shadow 180ms ease;
}

.installation-step + .installation-step {
  margin-top: clamp(1.5rem, 4vw, 2.5rem);
}

.installation-step.is-reading {
  border-left-color: var(--red);
  box-shadow: 0 18px 42px rgba(18, 40, 79, 0.11);
}

.installation-step-visual {
  min-width: 0;
  margin: 0;
  border-bottom: 1px solid var(--line);
  background: #f6f7f9;
}

.installation-step-visual img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: contain;
  background: var(--white);
}

.installation-step-visual figcaption {
  padding: 0.7rem 0.9rem;
  color: var(--muted);
  background: #f7f9fc;
  font-size: 0.68rem;
  line-height: 1.4;
}

.installation-step-copy {
  position: relative;
  min-width: 0;
  padding: clamp(1.25rem, 3vw, 2rem);
}

.installation-step-number {
  width: 2.65rem;
  height: 2.65rem;
  display: grid;
  place-items: center;
  margin-bottom: 1rem;
  border: 2px solid var(--navy);
  color: var(--navy);
  background: var(--white);
  font-size: 0.72rem;
  font-weight: 950;
}

.installation-step.is-reading .installation-step-number {
  border-color: var(--red);
  color: var(--white);
  background: var(--red);
}

.installation-step-copy h4 {
  margin-bottom: 0.75rem;
  color: var(--navy);
  font-size: clamp(1.2rem, 3vw, 1.6rem);
  line-height: 1.15;
}

.installation-step-copy p {
  margin-bottom: 0;
  color: var(--muted);
  font-size: 0.84rem;
  line-height: 1.65;
}

.installation-step-copy p strong {
  color: var(--navy);
}

.installation-methods {
  display: grid;
  gap: 0.75rem;
}

.installation-methods p {
  padding: 0.8rem 0.9rem;
  border-left: 3px solid var(--gold);
  background: var(--navy-soft);
}

.installation-restriction {
  margin-top: 0.9rem !important;
  padding: 0.75rem 0.9rem;
  border-left: 3px solid var(--red);
  color: var(--navy) !important;
  background: #fff6f4;
  font-weight: 750;
}

.guide-block + .guide-block {
  margin-top: 4.5rem;
  padding-top: 4.5rem;
  border-top: 1px solid var(--gold);
}

.video-slot {
  position: relative;
  aspect-ratio: 16 / 9;
  display: grid;
  place-items: center;
  overflow: hidden;
  border: 1px solid rgba(31, 56, 100, 0.22);
  color: var(--white);
  background:
    linear-gradient(135deg, rgba(31, 56, 100, 0.97), rgba(18, 40, 79, 0.9)),
    var(--navy);
  box-shadow: var(--shadow);
  text-align: center;
}

.video-slot img {
  position: absolute;
  z-index: 1;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.video-slot.is-missing img {
  display: none;
}

.video-copy {
  position: relative;
  z-index: 2;
  display: none;
  justify-items: center;
  gap: 0.4rem;
  padding: 1.5rem;
}

.video-slot.is-missing .video-copy {
  display: grid;
}

.play-mark {
  width: 4rem;
  height: 4rem;
  display: grid;
  place-items: center;
  margin-bottom: 0.4rem;
  border: 2px solid var(--white);
  border-radius: 50%;
  font-size: 1.25rem;
}

.video-copy code {
  color: #dce6f4;
  font-size: 0.72rem;
}

.step-list {
  counter-reset: install-step;
}

.step-list li {
  position: relative;
  min-height: 3.4rem;
  padding: 0.25rem 0 1.1rem 3.4rem;
  counter-increment: install-step;
}

.step-list li::before {
  content: counter(install-step, decimal-leading-zero);
  position: absolute;
  top: 0;
  left: 0;
  width: 2.55rem;
  height: 2.55rem;
  display: grid;
  place-items: center;
  border: 2px solid var(--navy);
  color: var(--navy);
  background: var(--white);
  font-size: 0.75rem;
  font-weight: 900;
}

.safety-note {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 1rem;
  margin-top: 2.5rem;
  padding: 1.35rem;
  border-left: 5px solid var(--red);
  color: var(--navy);
  background: #fff6f4;
}

.safety-note strong {
  display: block;
  margin-bottom: 0.2rem;
  text-transform: uppercase;
}

.safety-symbol {
  font-size: 1.4rem;
  line-height: 1.2;
}

.warranty-number {
  width: min(100%, 24rem);
  aspect-ratio: 1;
  display: grid;
  place-content: center;
  margin-inline: auto;
  border: 1px solid rgba(201, 162, 75, 0.7);
  border-radius: 50%;
  color: var(--white);
  background: var(--navy);
  box-shadow: 0 0 0 1rem var(--navy-soft), var(--shadow);
  text-align: center;
}

.warranty-number strong {
  color: var(--white);
  font-family: "Arial Narrow", "Roboto Condensed", Impact, sans-serif;
  font-size: clamp(5rem, 22vw, 8rem);
  letter-spacing: -0.04em;
  line-height: 0.8;
}

.warranty-number span {
  margin-top: 0.8rem;
  color: var(--gold);
  font-size: 0.78rem;
  font-weight: 900;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.coverage-card h3 {
  display: flex;
  align-items: center;
  gap: 0.65rem;
}

.coverage-card h3::before {
  content: "";
  width: 0.55rem;
  height: 0.55rem;
  border-radius: 50%;
  background: var(--red);
}

.register-panel {
  padding: clamp(1.25rem, 5vw, 2.25rem);
  border-top: 5px solid var(--red);
  background: var(--white);
  box-shadow: var(--shadow);
}

.form-grid {
  display: grid;
  gap: 1.1rem;
}

.form-field {
  display: grid;
  gap: 0.42rem;
}

.form-field label {
  color: var(--navy);
  font-size: 0.78rem;
  font-weight: 900;
  letter-spacing: 0.055em;
  text-transform: uppercase;
}

.form-field input,
.form-field select {
  width: 100%;
  min-height: 3.25rem;
  padding: 0.72rem 0.8rem;
  border: 1px solid #bfc8d5;
  border-radius: 2px;
  color: var(--ink);
  background: var(--white);
}

.form-field input:focus,
.form-field select:focus {
  border-color: var(--navy);
  box-shadow: 0 0 0 3px rgba(31, 56, 100, 0.11);
  outline: none;
}

.field-hint,
.form-note,
.form-status {
  color: var(--muted);
  font-size: 0.8rem;
}

.register-panel .button {
  width: 100%;
  margin-top: 0.25rem;
}

.thank-you {
  scroll-margin-top: 6rem;
  padding: 1.75rem;
  border-top: 5px solid var(--red);
  background: var(--navy);
  color: var(--white);
  box-shadow: var(--shadow);
}

.thank-you h2,
.thank-you p {
  color: var(--white);
}

.thank-you h2 {
  font-size: clamp(2rem, 8vw, 3.2rem);
}

.thank-you[hidden] {
  display: none;
}

.registration-points {
  display: grid;
  gap: 1rem;
  align-content: start;
}

.registration-point {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.9rem;
  align-items: start;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--line);
}

.registration-point-number {
  width: 2.35rem;
  height: 2.35rem;
  display: grid;
  place-items: center;
  color: var(--white);
  background: var(--navy);
  font-size: 0.72rem;
  font-weight: 900;
}

.registration-point p {
  margin: 0;
  color: var(--muted);
}

.cta-band {
  border-top: 5px solid var(--red);
  background: var(--navy);
}

.cta-inner {
  display: grid;
  gap: 1.25rem;
  align-items: center;
  padding-block: 2.5rem;
}

.cta-inner h2,
.cta-inner p {
  color: var(--white);
}

.cta-inner h2 {
  margin-bottom: 0.45rem;
  font-size: clamp(1.8rem, 7vw, 3rem);
}

.cta-inner p {
  margin-bottom: 0;
  color: rgba(255, 255, 255, 0.72);
}

.site-footer {
  color: rgba(255, 255, 255, 0.72);
  background: var(--navy-dark);
}

.footer-main {
  display: grid;
  gap: 2rem;
  padding-block: 3rem;
}

.footer-brand .brand {
  margin-bottom: 1rem;
  color: var(--white);
}

.footer-brand p {
  max-width: 28rem;
  margin-bottom: 0;
}

.footer-heading {
  margin-bottom: 0.85rem;
  color: var(--white);
  font-size: 0.73rem;
  font-weight: 900;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.footer-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.footer-list li + li {
  margin-top: 0.5rem;
}

.footer-list a:hover {
  color: var(--white);
}

.footer-cert {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid rgba(201, 162, 75, 0.35);
  color: var(--white);
  font-size: 0.78rem;
  font-weight: 800;
}

.footer-bottom {
  padding-block: 1.1rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  color: rgba(255, 255, 255, 0.5);
  font-size: 0.74rem;
}

@media (min-width: 38rem) {
  .container {
    width: min(calc(100% - 3rem), var(--max));
  }

  .feature-grid,
  .trust-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .product-grid,
  .coverage-grid,
  .fact-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .form-grid-two {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .form-grid-two .form-field-wide {
    grid-column: 1 / -1;
  }

  .install-start-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 52rem) {
  .menu-toggle {
    display: none;
  }

  .site-nav {
    position: static;
    display: block;
    padding: 0;
    border: 0;
    background: transparent;
    box-shadow: none;
  }

  .site-nav ul {
    display: flex;
    align-items: center;
    gap: 0.2rem;
  }

  .site-nav a {
    position: relative;
    padding: 1.78rem 0.72rem 1.65rem;
    border: 0;
  }

  .site-nav a::after {
    content: "";
    position: absolute;
    right: 0.72rem;
    bottom: 1.2rem;
    left: 0.72rem;
    height: 3px;
    transform: scaleX(0);
    transform-origin: left;
    background: var(--red);
    transition: transform 160ms ease;
  }

  .site-nav a:hover::after,
  .site-nav a[aria-current="page"]::after {
    transform: scaleX(1);
  }

  .site-nav a[aria-current="page"] {
    box-shadow: none;
  }

  .hero-grid,
  .intro-grid,
  .product-detail,
  .guide-grid,
  .warranty-grid,
  .register-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(20rem, 0.95fr);
    align-items: center;
  }

  .hero-grid {
    grid-template-columns: minmax(22rem, 0.78fr) minmax(34rem, 1.22fr);
    gap: clamp(2.5rem, 5vw, 4.5rem);
    min-height: 0;
    padding-block: clamp(3.5rem, 6vw, 5.25rem);
  }

  .hero-copy h1 {
    font-size: clamp(3.5rem, 5.1vw, 5.2rem);
  }

  .hero-media {
    min-height: clamp(34rem, 66vh, 43rem);
  }

  .install-selector-layout {
    grid-template-columns: minmax(17rem, 0.68fr) minmax(0, 2fr);
  }

  .install-sidebar {
    position: sticky;
    top: 6.25rem;
  }

  .product-detail:nth-of-type(even) .product-visual,
  .guide-block:nth-of-type(even) .guide-visual {
    order: 2;
  }

  .footer-main {
    grid-template-columns: minmax(16rem, 1.5fr) 0.8fr 1fr;
  }

  .cta-inner {
    grid-template-columns: 1fr auto;
  }
}

@media (min-width: 68rem) {
  .site-nav a {
    padding-inline: 1rem;
  }

  .site-nav a::after {
    right: 1rem;
    left: 1rem;
  }

  .hero-grid {
    grid-template-columns: minmax(23rem, 0.72fr) minmax(40rem, 1.28fr);
    gap: 3.5rem;
  }

  .fact-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}
/* Homepage direction 1 — cinematic winter protection */
.home-page {
  --home-max: 1360px;
  background: var(--white);
}

.home-page::before {
  display: none;
}

.home-page .site-header {
  position: absolute;
  inset: 0 0 auto;
  z-index: 100;
  border-bottom-color: rgba(255, 255, 255, 0.15);
  color: var(--white);
  background: linear-gradient(180deg, rgba(3, 18, 42, 0.52), rgba(3, 18, 42, 0.08));
  box-shadow: none;
  backdrop-filter: none;
}

.home-page .header-inner,
.home-page .home-hero-inner,
.home-page .home-systems-section > .container {
  width: min(calc(100% - 2rem), var(--home-max));
}

.home-page .site-header .brand {
  color: var(--white);
}

.home-page .menu-toggle {
  border-color: rgba(255, 255, 255, 0.42);
  color: var(--white);
  background: rgba(3, 18, 42, 0.4);
}

.home-page .site-nav {
  border-bottom-color: var(--red);
  background: #071b39;
}

.home-page .site-nav a {
  border-bottom-color: rgba(255, 255, 255, 0.14);
  color: var(--white);
}

.home-page .site-nav a:hover,
.home-page .site-nav a[aria-current="page"] {
  color: var(--white);
}

.home-hero {
  position: relative;
  min-height: 54rem;
  display: flex;
  overflow: hidden;
  isolation: isolate;
  color: var(--white);
  background: #061a38;
}

.home-hero::before,
.home-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.home-hero::before {
  z-index: -2;
  background-image: url("images/hero.png");
  background-repeat: no-repeat;
  background-position: 66% bottom;
  background-size: auto 72%;
}

.home-hero::after {
  z-index: -1;
  background:
    linear-gradient(180deg, rgba(2, 15, 35, 0.28) 0%, rgba(2, 15, 35, 0.08) 50%, rgba(2, 15, 35, 0.48) 100%),
    linear-gradient(90deg, rgba(4, 24, 53, 0.98) 0%, rgba(4, 24, 53, 0.95) 48%, rgba(4, 24, 53, 0.76) 72%, rgba(4, 24, 53, 0.26) 100%);
}

.home-hero-inner {
  min-height: inherit;
  display: flex;
  align-items: center;
  padding-top: 7.8rem;
  padding-bottom: 3rem;
}

.home-hero-copy {
  width: min(100%, 35rem);
}

.home-hero-kicker {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  margin: 0 0 1.3rem;
  color: var(--white);
  font-size: 0.7rem;
  font-weight: 900;
  letter-spacing: 0.18em;
  line-height: 1.4;
  text-transform: uppercase;
}

.home-hero-kicker::before {
  content: "";
  width: 2.55rem;
  height: 3px;
  flex: 0 0 auto;
  background: var(--gold);
}

.home-hero h1 {
  margin: 0;
  color: var(--white);
  font-size: clamp(3.35rem, 15vw, 5.1rem);
  letter-spacing: -0.025em;
  line-height: 0.88;
  text-shadow: 0 3px 24px rgba(0, 0, 0, 0.18);
}

.home-hero h1 span {
  display: block;
}

.home-hero h1 span + span {
  margin-top: 0.15em;
}

.home-hero h1 .home-hero-accent {
  color: #d64633;
}

.home-hero-lead {
  max-width: 30rem;
  margin: 1.5rem 0 0;
  color: rgba(255, 255, 255, 0.9);
  font-size: 1.03rem;
  line-height: 1.55;
}

.home-hero-actions {
  width: min(100%, 21rem);
  display: grid;
  gap: 0.75rem;
  margin-top: 1.7rem;
}

.home-page .home-primary-button,
.home-page .home-secondary-button {
  min-height: 3.35rem;
  padding-inline: 1.35rem;
  box-shadow: none;
}

.home-page .home-primary-button {
  border-color: #d64633;
  background: #d64633;
}

.home-page .home-primary-button:hover {
  transform: translateY(-2px);
  border-color: #e6503c;
  background: #e6503c;
  box-shadow: 0 10px 24px rgba(192, 57, 43, 0.28);
}

.home-page .home-secondary-button {
  border-color: rgba(255, 255, 255, 0.92);
  color: var(--white);
  background: rgba(3, 18, 42, 0.2);
}

.home-page .home-secondary-button:hover {
  transform: translateY(-2px);
  color: var(--navy);
  background: var(--white);
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.18);
}

.home-proof-list {
  display: grid;
  gap: 0.8rem;
  margin: 2.1rem 0 0;
  padding: 1.1rem 0 0;
  border-top: 1px solid rgba(255, 255, 255, 0.2);
  list-style: none;
}

.home-proof-list li {
  min-width: 0;
  display: grid;
  grid-template-columns: 2.65rem minmax(0, 1fr);
  align-items: center;
  gap: 0.7rem;
}

.home-proof-icon {
  width: 2.65rem;
  height: 2.65rem;
  display: grid;
  place-items: center;
  overflow: hidden;
}

.home-proof-icon img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: brightness(0) invert(1);
  opacity: 0.94;
}

.home-proof-list strong {
  color: var(--white);
  font-size: 0.68rem;
  font-weight: 900;
  letter-spacing: 0.085em;
  line-height: 1.3;
  text-transform: uppercase;
}

.home-systems-section {
  padding: clamp(3.25rem, 7vw, 5.8rem) 0 clamp(4rem, 8vw, 6.75rem);
  background:
    linear-gradient(180deg, #ffffff 0%, #ffffff 66%, #f7f9fc 100%);
}

.home-section-heading {
  max-width: 52rem;
  margin: 0 auto clamp(2rem, 5vw, 3rem);
  text-align: center;
}

.home-section-heading h2 {
  margin: 0;
  color: var(--navy);
  font-size: clamp(1.85rem, 4.5vw, 2.35rem);
  text-transform: none;
}

.home-section-kicker {
  margin: 0 0 0.55rem;
  color: var(--red);
  font-size: 0.69rem;
  font-weight: 900;
  letter-spacing: 0.16em;
  line-height: 1.45;
  text-transform: uppercase;
}

.home-system-grid {
  display: grid;
  gap: 1rem;
}

.home-system-card {
  display: grid;
  overflow: hidden;
  border: 1px solid #d9dfe8;
  border-radius: 3px;
  color: inherit;
  background: var(--white);
  box-shadow: 0 10px 30px rgba(18, 40, 79, 0.06);
  text-decoration: none;
  transition: transform 180ms ease, border-color 180ms ease, box-shadow 180ms ease;
}

.home-system-card:hover {
  transform: translateY(-3px);
  border-color: rgba(192, 57, 43, 0.48);
  box-shadow: 0 20px 38px rgba(18, 40, 79, 0.12);
}

.home-system-media {
  min-height: 15rem;
  overflow: hidden;
  margin: 0;
  background: #f5f7fb;
}

.home-system-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  transition: transform 350ms ease;
}

.home-system-card:hover .home-system-media img {
  transform: scale(1.025);
}

.home-system-copy {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 1.45rem;
}

.home-system-code {
  margin-bottom: 0.65rem;
  color: var(--red);
  font-size: 0.65rem;
  font-weight: 900;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.home-system-copy h3 {
  margin-bottom: 0.65rem;
  color: var(--navy);
  font-size: 1.05rem;
  letter-spacing: 0.01em;
  line-height: 1.24;
  text-transform: uppercase;
}

.home-system-copy p {
  margin-bottom: 1rem;
  color: #3f4959;
  font-size: 0.83rem;
  line-height: 1.55;
}

.home-system-link {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  color: var(--red);
  font-size: 0.74rem;
  font-weight: 900;
}

.home-system-link span {
  font-size: 1rem;
  transition: transform 160ms ease;
}

.home-system-card:hover .home-system-link span {
  transform: translateX(0.3rem);
}

.home-story-section {
  border-top: 1px solid var(--line);
}

.home-page .section-soft {
  background:
    linear-gradient(135deg, rgba(31, 56, 100, 0.035), transparent 48%),
    var(--off-white);
}

.home-page .section-navy {
  background:
    radial-gradient(circle at 88% 12%, rgba(201, 162, 75, 0.12), transparent 30%),
    var(--navy);
}

@media (min-width: 38rem) {
  .home-proof-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0;
    max-width: 39rem;
  }

  .home-proof-list li {
    grid-template-columns: 2.65rem minmax(0, 1fr);
    gap: 0.55rem;
    padding-inline: 1rem;
  }

  .home-proof-list li:first-child {
    padding-left: 0;
  }

  .home-proof-list li + li {
    border-left: 2px solid var(--gold);
  }

  .home-system-card {
    grid-template-columns: minmax(0, 1.15fr) minmax(13rem, 0.85fr);
  }

  .home-system-media {
    min-height: 17.5rem;
  }
}

@media (min-width: 52rem) {
  .home-page .site-nav {
    background: transparent;
  }

  .home-page .site-nav ul {
    gap: 0.3rem;
  }

  .home-page .site-nav a {
    padding: 1.78rem 0.82rem 1.65rem;
    border: 0;
    color: rgba(255, 255, 255, 0.92);
  }

  .home-page .site-nav a:hover,
  .home-page .site-nav a[aria-current="page"] {
    color: var(--white);
  }

  .home-page .site-nav a::after {
    right: 0.82rem;
    left: 0.82rem;
  }

  .home-hero {
    min-height: clamp(39rem, 51vw, 50rem);
  }

  .home-hero::before {
    background-position: right bottom;
    background-size: auto 100%;
  }

  .home-hero::after {
    background:
      linear-gradient(180deg, rgba(2, 15, 35, 0.26) 0%, rgba(2, 15, 35, 0.02) 52%, rgba(2, 15, 35, 0.35) 100%),
      linear-gradient(90deg, rgba(4, 24, 53, 0.99) 0%, rgba(4, 24, 53, 0.96) 34%, rgba(4, 24, 53, 0.72) 45%, rgba(4, 24, 53, 0.16) 60%, rgba(4, 24, 53, 0.02) 78%, rgba(4, 24, 53, 0) 100%);
  }

  .home-hero-inner {
    padding-top: 6.9rem;
    padding-bottom: 2rem;
  }

  .home-hero-copy {
    width: 34rem;
    transform: translateY(1.25rem);
  }

  .home-hero h1 {
    font-size: clamp(3rem, 4.5vw, 4.35rem);
  }

  .home-hero-lead {
    margin-top: 1.2rem;
    font-size: 1.06rem;
  }

  .home-proof-list {
    width: clamp(27rem, 35vw, 32.5rem);
    margin-top: 1.7rem;
  }

  .home-proof-list li {
    grid-template-columns: 2.2rem minmax(0, 1fr);
    gap: 0.35rem;
    padding-inline: 0.65rem;
  }

  .home-proof-icon {
    width: 2.2rem;
    height: 2.2rem;
  }

  .home-proof-list strong {
    font-size: 0.53rem;
    letter-spacing: 0.06em;
  }

  .home-hero-actions {
    width: clamp(15.5rem, 20vw, 19rem);
    gap: 0.65rem;
    margin-top: 1.35rem;
  }

  .home-page .home-primary-button,
  .home-page .home-secondary-button {
    min-height: 3.1rem;
  }

  .home-system-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .home-system-card {
    grid-template-columns: minmax(0, 1.16fr) minmax(12rem, 0.84fr);
  }

  .home-systems-section {
    padding-top: 1.8rem;
  }

  .home-section-heading {
    margin-bottom: 1.5rem;
  }
}

@media (min-width: 72rem) {
  .home-page .header-inner,
  .home-page .home-hero-inner {
    width: min(calc(100% - 6rem), var(--home-max));
  }

  .home-page .home-systems-section > .container {
    width: min(calc(100% - 8rem), var(--home-max));
  }

  .home-page .site-nav a {
    padding-inline: 1.15rem;
  }

  .home-page .site-nav a::after {
    right: 1.15rem;
    left: 1.15rem;
  }
}

@media (max-width: 30rem) {
  .home-hero {
    min-height: 56rem;
  }

  .home-hero::before {
    background-position: 63% bottom;
    background-size: auto 67%;
  }

  .home-hero h1 {
    font-size: clamp(3.1rem, 15.5vw, 4rem);
  }

  .home-proof-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    align-items: start;
    gap: 0.45rem;
  }

  .home-proof-list li {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 0.35rem;
  }

  .home-proof-list strong {
    font-size: 0.58rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .home-system-card,
  .home-system-media img,
  .home-system-link span {
    transition: none;
  }
}

/* Full-site experience layer — progressive enhancement with touch-safe fallbacks */
.site-header {
  transition: background-color 220ms ease, border-color 220ms ease, box-shadow 220ms ease;
}

.site-header.is-scrolled {
  border-bottom-color: rgba(31, 56, 100, 0.18);
  box-shadow: 0 12px 32px rgba(8, 24, 51, 0.12);
}

.home-page .site-header {
  position: fixed;
}

.home-page .site-header.is-scrolled {
  border-bottom-color: rgba(255, 255, 255, 0.12);
  background: rgba(3, 18, 42, 0.94);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.24);
  backdrop-filter: blur(14px);
}

.products-page,
.installation-page,
.installation-guide-page,
.warranty-page,
.register-page {
  background: #f7f9fc;
}

.products-page main,
.installation-page main,
.installation-guide-page main,
.warranty-page main,
.register-page main {
  overflow: clip;
}

.products-page .page-hero,
.installation-page .page-hero,
.installation-guide-page .page-hero,
.warranty-page .page-hero,
.register-page .page-hero {
  isolation: isolate;
  background:
    radial-gradient(circle at 83% 28%, rgba(201, 162, 75, 0.15), transparent 17rem),
    linear-gradient(112deg, #071d40 0%, #112d57 56%, #1f3864 100%);
}

.products-page .page-hero::before,
.installation-page .page-hero::before,
.installation-guide-page .page-hero::before,
.warranty-page .page-hero::before,
.register-page .page-hero::before {
  content: "";
  position: absolute;
  z-index: -1;
  top: -35%;
  right: -5rem;
  width: min(48vw, 42rem);
  aspect-ratio: 1;
  border: 1px solid rgba(255, 255, 255, 0.11);
  border-radius: 50%;
  box-shadow:
    0 0 0 4rem rgba(255, 255, 255, 0.018),
    0 0 0 8rem rgba(255, 255, 255, 0.012);
  pointer-events: none;
}

.page-hero .container {
  position: relative;
  z-index: 1;
}

.page-hero .lead {
  max-width: 48rem;
  color: rgba(255, 255, 255, 0.78);
}

.page-hero .eyebrow {
  color: #e9c978;
}

.page-hero .eyebrow::before {
  background: var(--gold);
}

.product-switcher {
  position: relative;
  z-index: 20;
  border-bottom: 1px solid #d8dee8;
  background: rgba(255, 255, 255, 0.97);
  box-shadow: 0 8px 24px rgba(18, 40, 79, 0.06);
  backdrop-filter: blur(14px);
}

.product-switcher-inner {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.55rem;
  align-items: center;
  padding-block: 0.7rem;
}

.product-switcher-label {
  grid-column: 1 / -1;
  color: var(--muted);
  font-size: 0.64rem;
  font-weight: 900;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}

.product-switcher a {
  min-height: 2.9rem;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  padding: 0.65rem 0.6rem;
  border: 1px solid var(--line);
  color: var(--navy);
  background: var(--white);
  text-align: center;
  text-decoration: none;
  font-size: 0.69rem;
  font-weight: 850;
  line-height: 1.25;
  transition: color 180ms ease, border-color 180ms ease, background-color 180ms ease;
}

.product-switcher a span {
  color: var(--red);
  font-size: 0.63rem;
  font-weight: 950;
  letter-spacing: 0.09em;
}

.product-switcher a.is-active {
  border-color: var(--navy);
  color: var(--white);
  background: var(--navy);
}

.product-switcher a.is-active span {
  color: #f1cd77;
}

.products-page > main > .section {
  background:
    linear-gradient(135deg, rgba(31, 56, 100, 0.035), transparent 42%),
    #f7f9fc;
}

.products-page .product-detail {
  scroll-margin-top: 10rem;
  padding: clamp(1rem, 4vw, 2.2rem);
  border: 1px solid #dce2ea;
  border-top: 5px solid var(--navy);
  background: var(--white);
  box-shadow: 0 20px 50px rgba(18, 40, 79, 0.08);
}

.products-page .product-detail + .product-detail {
  margin-top: clamp(2rem, 6vw, 4rem);
  padding-top: clamp(1rem, 4vw, 2.2rem);
  border-top: 5px solid var(--red);
}

.products-page .product-visual {
  min-width: 0;
  overflow: hidden;
  background: #f1f4f9;
}

.products-page .product-visual .media-slot {
  margin: 0;
  box-shadow: none;
}

.products-page .product-visual img {
  transition: transform 550ms cubic-bezier(0.2, 0.7, 0.2, 1);
}

.products-page .spec-card {
  border: 1px solid var(--line);
  border-top: 3px solid var(--navy);
  background: #f9fafc;
}

.products-page #roof-deicing .spec-card {
  border-top-color: var(--red);
}

.installation-page .install-cover {
  border-top: 5px solid var(--gold);
}

.install-cover img,
.install-cover-copy > * {
  transition: opacity 180ms ease, transform 260ms ease;
}

.install-cover.is-switching img,
.install-cover.is-switching .install-cover-copy > * {
  opacity: 0.16;
  transform: translateY(0.4rem);
}

.install-guide-button {
  width: fit-content;
  margin-top: 1.2rem;
  box-shadow: none;
}

.install-guide-button[hidden] {
  display: none;
}

.install-product-link.is-previewing {
  transform: translateX(0.25rem);
  border-color: var(--gold);
  box-shadow: 5px 5px 0 rgba(201, 162, 75, 0.28);
}

.install-product-link.is-previewing .install-product-code {
  background: var(--red);
}

.guide-detail-card {
  position: relative;
}

.guide-reading-progress {
  position: absolute;
  z-index: 5;
  top: 0;
  right: 0;
  left: 0;
  height: 5px;
  overflow: hidden;
  background: rgba(31, 56, 100, 0.12);
}

.guide-reading-progress span {
  width: 100%;
  height: 100%;
  display: block;
  transform: scaleX(0);
  transform-origin: left;
  background: linear-gradient(90deg, var(--red), var(--gold));
  will-change: transform;
}

.step-list [data-guide-step] {
  transition: color 180ms ease, transform 180ms ease;
}

.step-list [data-guide-step].is-reading {
  color: var(--navy);
}

.step-list [data-guide-step].is-reading::before {
  border-color: var(--red);
  color: var(--white);
  background: var(--red);
}

.warranty-page > main > .section:first-of-type {
  background:
    radial-gradient(circle at 74% 30%, rgba(201, 162, 75, 0.08), transparent 24rem),
    var(--white);
}

.warranty-path {
  position: relative;
  display: grid;
  gap: 0;
  margin-top: clamp(3.5rem, 8vw, 6rem);
  padding: 1.1rem 0;
}

.warranty-path-line {
  position: absolute;
  top: 1.1rem;
  bottom: 1.1rem;
  left: 1.45rem;
  width: 2px;
  overflow: hidden;
  background: #d9e0e9;
}

.warranty-path-line span {
  width: 100%;
  height: 100%;
  display: block;
  transform: scaleY(1);
  transform-origin: top;
  background: linear-gradient(180deg, var(--navy), var(--red), var(--gold));
}

.warranty-path article {
  position: relative;
  z-index: 1;
  min-height: 5.7rem;
  display: grid;
  grid-template-columns: 3rem minmax(0, 1fr);
  align-content: center;
  column-gap: 0.9rem;
  padding: 0.8rem 0;
}

.warranty-path article > span {
  grid-row: 1 / span 2;
  width: 3rem;
  height: 3rem;
  display: grid;
  place-items: center;
  border: 2px solid var(--navy);
  border-radius: 50%;
  color: var(--navy);
  background: var(--white);
  font-size: 0.68rem;
  font-weight: 950;
}

.warranty-path article:last-of-type > span {
  border-color: var(--red);
  color: var(--white);
  background: var(--red);
}

.warranty-path strong,
.warranty-path small {
  display: block;
}

.warranty-path strong {
  color: var(--navy);
  font-size: 0.9rem;
  text-transform: uppercase;
}

.warranty-path small {
  color: var(--muted);
  font-size: 0.76rem;
  line-height: 1.45;
}

.warranty-page .coverage-card {
  border-top-color: var(--navy);
  box-shadow: 0 16px 38px rgba(18, 40, 79, 0.07);
}

.warranty-page .coverage-card:nth-child(2) {
  border-top-color: var(--red);
}

.registration-progress {
  gap: 0.7rem;
  margin: -0.15rem 0 0.35rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--line);
}

.registration-progress > div {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  color: var(--navy);
  font-size: 0.68rem;
  font-weight: 900;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.registration-progress > div strong {
  color: var(--red);
}

.registration-progress-track {
  height: 0.42rem;
  display: block;
  overflow: hidden;
  border-radius: 999px;
  background: #e5eaf1;
}

.registration-progress-track > span {
  width: 100%;
  height: 100%;
  display: block;
  transform: scaleX(0);
  transform-origin: left;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--navy), var(--red));
  transition: transform 240ms ease;
}

.register-page .registration-point {
  transition: opacity 180ms ease, transform 180ms ease, border-color 180ms ease;
}

.register-page .registration-point.is-complete {
  border-color: rgba(192, 57, 43, 0.32);
  opacity: 0.72;
}

.register-page .registration-point.is-complete .registration-point-number {
  background: var(--red);
}

.register-page .registration-point.is-active {
  transform: translateX(0.3rem);
}

.register-page .registration-point.is-active .registration-point-number {
  box-shadow: 0 0 0 4px rgba(201, 162, 75, 0.25);
}

.register-page .form-field input:not(:placeholder-shown):valid,
.register-page .form-field select:valid {
  border-color: rgba(31, 56, 100, 0.46);
  background: linear-gradient(90deg, rgba(31, 56, 100, 0.035), transparent 50%);
}

.motion-ready [data-reveal] {
  opacity: 0;
  transform: translateY(1.25rem);
  transition: opacity 600ms ease, transform 600ms cubic-bezier(0.2, 0.75, 0.25, 1);
}

.motion-ready [data-reveal].is-revealed {
  opacity: 1;
  transform: translateY(0);
}

.motion-ready .warranty-path-line span {
  transform: scaleY(0);
  transition: transform 900ms 180ms cubic-bezier(0.2, 0.75, 0.25, 1);
}

.motion-ready .warranty-path.is-revealed .warranty-path-line span {
  transform: scaleY(1);
}

@media (hover: hover) and (pointer: fine) {
  .products-page .product-detail:hover .product-visual img {
    transform: scale(1.035);
  }

  .step-list [data-guide-step]:hover {
    transform: translateX(0.25rem);
    color: var(--navy);
  }

  .home-hero::before {
    inset: -1.5%;
    transform: translate3d(var(--hero-shift-x, 0px), var(--hero-shift-y, 0px), 0) scale(1.018);
    transition: transform 260ms ease-out;
    will-change: transform;
  }
}

@media (min-width: 52rem) {
  .product-switcher {
    position: sticky;
    top: 4.75rem;
  }

  .product-switcher-inner {
    grid-template-columns: auto auto auto 1fr;
    justify-content: start;
    gap: 0;
    padding-block: 0;
  }

  .product-switcher-label {
    grid-column: auto;
    margin-right: 1.3rem;
  }

  .product-switcher a {
    min-height: 4rem;
    padding-inline: 1.25rem;
    border-width: 0 0 3px;
    border-color: transparent;
    background: transparent;
  }

  .product-switcher a.is-active {
    border-color: var(--red);
    color: var(--navy);
    background: rgba(31, 56, 100, 0.045);
  }

  .product-switcher a.is-active span {
    color: var(--red);
  }

  .products-page .product-detail {
    gap: clamp(2rem, 5vw, 4rem);
  }

  .warranty-path {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1rem;
    padding-top: 0;
  }

  .warranty-path-line {
    top: 1.45rem;
    right: 16.667%;
    bottom: auto;
    left: 16.667%;
    width: auto;
    height: 2px;
  }

  .warranty-path-line span {
    transform: scaleX(1);
    background: linear-gradient(90deg, var(--navy), var(--red), var(--gold));
  }

  .warranty-path article {
    min-height: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 0;
    text-align: center;
  }

  .warranty-path article > span {
    grid-row: auto;
    margin-bottom: 0.9rem;
  }

  .warranty-path small {
    max-width: 16rem;
    margin-top: 0.25rem;
  }

  .motion-ready .warranty-path-line span {
    transform: scaleX(0);
    transform-origin: left;
  }

  .motion-ready .warranty-path.is-revealed .warranty-path-line span {
    transform: scaleX(1);
  }
}

@media (min-width: 70rem) {
  .guide-prep-grid {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
  }

  .installation-step {
    grid-template-columns: minmax(0, 1.18fr) minmax(17rem, 0.82fr);
    align-items: stretch;
  }

  .installation-step:nth-of-type(even) {
    grid-template-columns: minmax(17rem, 0.82fr) minmax(0, 1.18fr);
  }

  .installation-step:nth-of-type(even) .installation-step-visual {
    order: 2;
  }

  .installation-step-visual {
    display: grid;
    align-content: center;
    border-right: 1px solid var(--line);
    border-bottom: 0;
  }

  .installation-step:nth-of-type(even) .installation-step-visual {
    border-right: 0;
    border-left: 1px solid var(--line);
  }

  .installation-step-copy {
    display: flex;
    flex-direction: column;
    justify-content: center;
  }
}

@media (max-width: 51.99rem) {
  .install-cover-copy .install-guide-button {
    display: none;
  }

  .products-page .product-detail {
    margin-inline: -0.25rem;
  }

  .register-page .registration-points {
    margin-bottom: 1rem;
  }
}

@media (max-width: 37.99rem) {
  .page-hero {
    padding-block: 3rem 3.5rem;
  }

  .page-hero h1 {
    font-size: clamp(2.5rem, 13vw, 3.65rem);
  }

  .product-switcher-inner {
    width: min(calc(100% - 1rem), var(--max));
  }

  .product-switcher a {
    flex-direction: column;
    gap: 0.15rem;
  }

  .installation-page .install-cover {
    min-height: 28rem;
  }

  .warranty-number {
    width: min(78vw, 20rem);
  }
}

@media (prefers-reduced-motion: reduce) {
  .motion-ready [data-reveal],
  .motion-ready [data-reveal].is-revealed {
    opacity: 1;
    transform: none;
  }

  .motion-ready .warranty-path-line span,
  .motion-ready .warranty-path.is-revealed .warranty-path-line span,
  .home-hero::before {
    transform: none;
  }
}