:root {
  --ink: #11151c;
  --muted: #5c6574;
  --line: #dde3ea;
  --paper: #ffffff;
  --mist: #f4f7f9;
  --frost: #e8f4fb;
  --heat: #e84f2a;
  --heat-dark: #b52d1c;
  --pine: #0f4a48;
  --gold: #c99b45;
  --radius: 8px;
  --shadow: 0 20px 60px rgba(18, 28, 44, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.6;
}

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

a {
  color: inherit;
  text-decoration: none;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255, 255, 255, 0.94);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(16px);
}

.notice {
  padding: 8px 16px;
  color: #fff;
  background: var(--pine);
  text-align: center;
  font-size: 13px;
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1180px;
  min-height: 72px;
  margin: 0 auto;
  padding: 0 22px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  letter-spacing: 0;
  font-size: 20px;
}

.brand-mark {
  display: grid;
  width: 36px;
  height: 36px;
  place-items: center;
  color: #fff;
  background: var(--heat);
  border-radius: 50%;
  font-weight: 900;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 26px;
  color: #263141;
  font-weight: 650;
  font-size: 14px;
}

.nav-links a:hover {
  color: var(--heat-dark);
}

.nav-cta {
  padding: 10px 16px;
  color: #fff;
  background: var(--ink);
  border-radius: var(--radius);
}

.nav-cta:hover {
  color: #fff !important;
  background: var(--heat-dark);
}

.menu-toggle {
  display: none;
  min-width: 78px;
  min-height: 40px;
  color: #fff;
  background: var(--ink);
  border: 0;
  border-radius: var(--radius);
  font-weight: 750;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(320px, 1.05fr);
  gap: 28px;
  min-height: calc(100vh - 114px);
  padding: clamp(56px, 8vw, 96px) max(22px, calc((100vw - 1180px) / 2)) 36px;
  overflow: hidden;
  background:
    linear-gradient(120deg, rgba(244, 247, 249, 0.96) 0%, rgba(232, 244, 251, 0.75) 44%, rgba(255, 255, 255, 0.9) 100%),
    url("./assets/thermal-pattern.svg") center / cover;
}

.hero-content {
  align-self: center;
  max-width: 620px;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--heat-dark);
  font-size: 13px;
  font-weight: 850;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

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

h1 {
  max-width: 780px;
  margin-bottom: 20px;
  font-size: clamp(44px, 7vw, 86px);
  line-height: 0.95;
  letter-spacing: 0;
}

h2 {
  margin-bottom: 14px;
  font-size: clamp(30px, 4vw, 52px);
  line-height: 1.04;
  letter-spacing: 0;
}

h3 {
  margin-bottom: 10px;
  font-size: 20px;
  line-height: 1.18;
}

.hero p {
  max-width: 600px;
  color: #324052;
  font-size: clamp(17px, 2vw, 21px);
}

.hero-actions,
.support-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 12px 20px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  font-weight: 800;
  transition: transform 180ms ease, box-shadow 180ms ease, background 180ms ease;
}

.button:hover {
  transform: translateY(-1px);
  box-shadow: 0 12px 24px rgba(15, 31, 45, 0.12);
}

.primary {
  color: #fff;
  background: var(--heat);
}

.primary:hover {
  background: var(--heat-dark);
}

.secondary {
  color: var(--ink);
  background: #fff;
  border-color: var(--line);
}

.hero-visual {
  align-self: end;
  min-width: 0;
}

.hero-visual img {
  width: min(620px, 100%);
  margin-left: auto;
  filter: drop-shadow(0 28px 42px rgba(17, 21, 28, 0.2));
}

.feature-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  max-width: 1180px;
  margin: -22px auto 0;
  padding: 0 22px;
  position: relative;
  z-index: 2;
}

.feature-strip div {
  min-height: 118px;
  padding: 22px;
  background: var(--paper);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.feature-strip strong,
.feature-strip span {
  display: block;
}

.feature-strip strong {
  margin-bottom: 6px;
  font-size: 22px;
}

.feature-strip span {
  color: var(--muted);
  font-size: 14px;
}

.section,
.split-section {
  max-width: 1180px;
  margin: 0 auto;
  padding: clamp(70px, 9vw, 110px) 22px;
}

.section-heading {
  max-width: 760px;
  margin-bottom: 34px;
}

.section-heading p {
  color: var(--muted);
  font-size: 18px;
}

.product-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.product-card {
  overflow: hidden;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: 0 14px 32px rgba(15, 31, 45, 0.08);
}

.product-card img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  background: var(--mist);
}

.product-body {
  padding: 22px;
}

.product-tag {
  margin-bottom: 8px;
  color: var(--gold);
  font-size: 13px;
  font-weight: 850;
  text-transform: uppercase;
}

.product-body p:not(.product-tag) {
  color: var(--muted);
}

.variant-block {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 18px 0 12px;
}

.variant-block span {
  color: #263141;
  font-size: 13px;
  font-weight: 850;
  text-transform: uppercase;
}

.swatch {
  width: 30px;
  height: 30px;
  padding: 0;
  cursor: pointer;
  background: var(--swatch);
  border: 2px solid #fff;
  border-radius: 50%;
  box-shadow: 0 0 0 1px #cbd4df;
}

.swatch-light {
  box-shadow: 0 0 0 1px #aeb8c7;
}

.swatch.active {
  box-shadow: 0 0 0 3px rgba(232, 79, 42, 0.28), 0 0 0 1px var(--heat);
}

.size-row {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 6px;
  margin: 14px 0 18px;
}

.size-row span {
  display: grid;
  min-height: 34px;
  place-items: center;
  color: #263141;
  background: var(--mist);
  border: 1px solid var(--line);
  border-radius: 6px;
  font-size: 13px;
  font-weight: 800;
}

.product-button {
  width: 100%;
  margin-top: 8px;
  color: #fff;
  background: var(--ink);
}

.product-button:hover {
  background: var(--pine);
}

.split-section {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(300px, 0.86fr);
  gap: clamp(32px, 6vw, 72px);
  align-items: center;
}

.split-section p {
  color: var(--muted);
  font-size: 17px;
}

.check-list {
  display: grid;
  gap: 12px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}

.check-list li {
  position: relative;
  padding-left: 28px;
  color: #263141;
  font-weight: 650;
}

.check-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 10px;
  height: 10px;
  background: var(--heat);
  border-radius: 50%;
  box-shadow: 0 0 0 5px rgba(232, 79, 42, 0.12);
}

.panel-image {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.muted {
  max-width: none;
  background: var(--mist);
}

.muted > * {
  max-width: 1180px;
  margin-left: auto;
  margin-right: auto;
}

.info-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.info-grid article {
  min-height: 210px;
  padding: 24px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.info-grid p {
  color: var(--muted);
}

.support {
  align-items: start;
}

.support-form {
  display: grid;
  gap: 14px;
  padding: 24px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.support-form label {
  display: grid;
  gap: 6px;
  color: #263141;
  font-size: 14px;
  font-weight: 750;
}

input,
textarea {
  width: 100%;
  min-height: 46px;
  padding: 11px 12px;
  color: var(--ink);
  background: #fff;
  border: 1px solid #cfd7e2;
  border-radius: 6px;
  font: inherit;
}

textarea {
  resize: vertical;
}

input:focus,
textarea:focus {
  outline: 2px solid rgba(232, 79, 42, 0.25);
  border-color: var(--heat);
}

.hidden {
  display: none;
}

.about {
  max-width: 900px;
  padding: clamp(32px, 6vw, 64px);
  color: #fff;
  background:
    linear-gradient(135deg, rgba(17, 21, 28, 0.96), rgba(15, 74, 72, 0.9)),
    url("./assets/thermal-pattern.svg") center / cover;
  border-radius: var(--radius);
}

.about .eyebrow,
.about p {
  color: #fff;
}

.about p {
  font-size: 19px;
}

.faq {
  padding-top: 30px;
}

details {
  padding: 22px 0;
  border-top: 1px solid var(--line);
}

details:last-child {
  border-bottom: 1px solid var(--line);
}

summary {
  cursor: pointer;
  font-size: 20px;
  font-weight: 800;
}

details p {
  max-width: 760px;
  margin: 14px 0 0;
  color: var(--muted);
}

.footer {
  display: grid;
  grid-template-columns: 1fr 220px 220px;
  gap: 30px;
  padding: 52px max(22px, calc((100vw - 1180px) / 2));
  color: #d7dde6;
  background: var(--ink);
}

.footer p {
  max-width: 430px;
  color: #aeb8c7;
}

.footer h2 {
  margin-bottom: 12px;
  font-size: 15px;
  text-transform: uppercase;
}

.footer a {
  display: block;
  margin-bottom: 9px;
}

.footer a:hover {
  color: #fff;
}

.footer-brand {
  margin-bottom: 14px;
  color: #fff;
}

@media (max-width: 900px) {
  .menu-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

  .nav {
    position: relative;
  }

  .nav-links {
    position: absolute;
    top: 72px;
    left: 22px;
    right: 22px;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 12px;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
  }

  .nav-links.open {
    display: flex;
  }

  .nav-links a {
    padding: 12px;
  }

  .hero,
  .split-section {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
    padding-top: 58px;
  }

  .hero-visual {
    order: -1;
  }

  .hero-visual img {
    width: min(480px, 100%);
    margin: 0 auto;
  }

  .feature-strip,
  .product-grid,
  .info-grid,
  .footer {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 620px) {
  .notice {
    font-size: 12px;
  }

  .brand {
    font-size: 18px;
  }

  .hero-actions,
  .support-actions {
    display: grid;
  }

  .feature-strip,
  .product-grid,
  .info-grid,
  .footer {
    grid-template-columns: 1fr;
  }

  .feature-strip {
    margin-top: 0;
  }

  .section,
  .split-section {
    padding-top: 64px;
    padding-bottom: 64px;
  }

  .about {
    padding: 28px;
  }
}