:root {
  --ink: #10213f;
  --navy: #16326e;
  --blue: #1256e0;
  --blue-dark: #0d47c0;
  --green: #087a58;
  --green-soft: #e5f7f0;
  --line: #dce6f3;
  --muted: #586b8c;
  --surface: #ffffff;
  --canvas: #f2f6fb;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--canvas);
  color: var(--ink);
  font-family: "Segoe UI", Arial, sans-serif;
  letter-spacing: 0;
}

img,
video {
  max-width: 100%;
}

a {
  color: inherit;
}

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

:focus-visible {
  outline: 3px solid #67b5ff;
  outline-offset: 3px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(12px);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: 14px;
  width: min(1120px, calc(100% - 32px));
  min-height: 70px;
  margin: 0 auto;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--navy);
  text-decoration: none;
}

.brand-mark {
  display: grid;
  width: 40px;
  height: 40px;
  place-items: center;
  border-radius: 8px;
  background: var(--navy);
  color: #ffffff;
  font-size: 14px;
  font-weight: 900;
}

.brand-copy {
  display: grid;
  gap: 1px;
}

.brand-name {
  font-size: 17px;
  font-weight: 900;
}

.brand-tagline {
  color: var(--muted);
  font-size: 11px;
}

.header-spacer {
  flex: 1;
}

.language-link,
.header-order {
  display: inline-flex;
  min-height: 42px;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  padding: 9px 16px;
  font-size: 14px;
  font-weight: 800;
  text-decoration: none;
}

.language-link {
  border: 1px solid #bfd0ea;
  color: var(--navy);
}

.header-order {
  background: var(--blue);
  color: #ffffff;
}

.hero {
  border-bottom: 1px solid var(--line);
  background: var(--surface);
}

.hero-inner {
  display: grid;
  width: min(1120px, calc(100% - 40px));
  min-height: 630px;
  margin: 0 auto;
  padding: 56px 0;
  grid-template-columns: minmax(0, 1.05fr) minmax(360px, 0.95fr);
  align-items: center;
  gap: 54px;
}

.kicker {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  border: 1px solid #bde7d7;
  border-radius: 8px;
  padding: 6px 11px;
  background: var(--green-soft);
  color: var(--green);
  font-size: 13px;
  font-weight: 900;
}

.hero h1 {
  max-width: 720px;
  margin: 18px 0 16px;
  color: var(--navy);
  font-size: clamp(36px, 5vw, 55px);
  line-height: 1.1;
  text-wrap: balance;
}

.hero-lead {
  max-width: 680px;
  margin: 0;
  color: #425779;
  font-size: 18px;
  line-height: 1.75;
}

.hero-actions {
  display: flex;
  align-items: stretch;
  gap: 12px;
  margin-top: 26px;
  flex-wrap: wrap;
}

.primary-action,
.secondary-action {
  display: inline-flex;
  min-height: 54px;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  padding: 14px 24px;
  font-size: 17px;
  font-weight: 900;
  text-decoration: none;
}

.primary-action {
  background: var(--blue);
  box-shadow: 0 12px 26px rgba(18, 86, 224, 0.24);
  color: #ffffff;
}

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

.secondary-action {
  border: 1px solid #b9cce8;
  background: #ffffff;
  color: var(--navy);
}

.hero-price {
  display: flex;
  align-items: baseline;
  gap: 8px;
  margin-top: 22px;
  color: var(--navy);
}

.hero-price strong {
  font-size: 30px;
  line-height: 1;
}

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

.hero-notes {
  display: flex;
  gap: 9px;
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
  flex-wrap: wrap;
}

.hero-notes li {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #f8fbff;
  padding: 9px 11px;
  color: #354f76;
  font-size: 13px;
  font-weight: 800;
}

.hero-media {
  overflow: hidden;
  border: 1px solid #cdd9e9;
  border-radius: 8px;
  background: #eaf1f8;
  box-shadow: 0 24px 48px rgba(22, 50, 110, 0.16);
}

.hero-media img {
  display: block;
  width: 100%;
  height: 560px;
  object-fit: cover;
  object-position: 50% 16%;
}

.section {
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
  padding: 72px 0;
}

.section.compact {
  padding-top: 36px;
}

.section-heading {
  max-width: 790px;
  margin: 0 auto 34px;
  text-align: center;
}

.section-heading h2 {
  margin: 0 0 12px;
  color: var(--navy);
  font-size: clamp(28px, 4vw, 38px);
  line-height: 1.2;
  text-wrap: balance;
}

.section-heading p {
  margin: 0;
  color: var(--muted);
  font-size: 17px;
  line-height: 1.75;
}

.problem-points {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--line);
}

.problem-point {
  min-height: 170px;
  padding: 25px;
  background: #ffffff;
}

.problem-point strong {
  display: block;
  margin-bottom: 8px;
  color: var(--navy);
  font-size: 18px;
}

.problem-point p {
  margin: 0;
  color: var(--muted);
  line-height: 1.7;
}

.comparison-band {
  border-block: 1px solid var(--line);
  background: #eaf2fb;
}

.comparison-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px;
}

.comparison-grid figure {
  overflow: hidden;
  margin: 0;
  border: 1px solid #cad8e9;
  border-radius: 8px;
  background: #ffffff;
}

.comparison-grid img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 11 / 15;
  object-fit: cover;
}

.comparison-grid figcaption {
  min-height: 58px;
  padding: 16px 18px;
  color: var(--navy);
  font-size: 16px;
  font-weight: 900;
  text-align: center;
}

.package-block {
  margin-top: 44px;
}

.package-heading {
  margin-bottom: 30px;
}

.parts-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.part-card {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #ffffff;
}

.part-image {
  display: grid;
  min-height: 220px;
  place-items: center;
  background: #f6f9fd;
  padding: 20px;
}

.part-image img {
  display: block;
  width: 100%;
  height: 180px;
  object-fit: contain;
}

.part-copy {
  padding: 20px;
}

.part-copy h3 {
  margin: 0 0 7px;
  color: var(--navy);
  font-size: 19px;
}

.part-copy p {
  margin: 0;
  color: var(--muted);
  line-height: 1.65;
}

.installation-band {
  background: #102e63;
  color: #ffffff;
}

.installation-inner {
  display: grid;
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
  padding: 72px 0;
  grid-template-columns: minmax(0, 0.92fr) minmax(340px, 0.78fr);
  align-items: center;
  gap: 54px;
}

.installation-copy h2 {
  margin: 0 0 14px;
  font-size: clamp(29px, 4vw, 40px);
  line-height: 1.2;
}

.installation-copy > p {
  margin: 0 0 22px;
  color: #d9e7ff;
  font-size: 17px;
  line-height: 1.75;
}

.installation-steps {
  display: grid;
  gap: 12px;
  margin: 0;
  padding-inline-start: 24px;
  color: #f5f8ff;
  line-height: 1.55;
}

.video-frame {
  position: relative;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.42);
  border-radius: 8px;
  background: #06142f;
  box-shadow: 0 24px 48px rgba(1, 12, 35, 0.28);
}

.installation-video {
  display: block;
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
}

.video-play {
  position: absolute;
  top: 50%;
  left: 50%;
  display: grid;
  width: 74px;
  height: 74px;
  place-items: center;
  transform: translate(-50%, -50%);
  border: 3px solid rgba(255, 255, 255, 0.75);
  border-radius: 50%;
  background: #ffffff;
  color: var(--blue);
  cursor: pointer;
  font-size: 31px;
  line-height: 1;
  transition: transform 160ms ease, opacity 160ms ease;
}

.video-play:hover {
  transform: translate(-50%, -50%) scale(1.07);
}

.spec-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(300px, 0.62fr);
  align-items: start;
  gap: 42px;
}

.spec-copy h2 {
  margin: 0 0 12px;
  color: var(--navy);
  font-size: clamp(28px, 4vw, 38px);
}

.spec-copy > p {
  margin: 0;
  color: var(--muted);
  line-height: 1.75;
}

.spec-list {
  display: grid;
  margin: 0;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #ffffff;
}

.spec-row {
  display: grid;
  padding: 15px 18px;
  grid-template-columns: minmax(120px, 0.8fr) minmax(0, 1.2fr);
  gap: 18px;
  border-bottom: 1px solid var(--line);
}

.spec-row:last-child {
  border-bottom: 0;
}

.spec-row dt {
  color: var(--muted);
  font-size: 14px;
  font-weight: 700;
}

.spec-row dd {
  margin: 0;
  color: var(--navy);
  font-weight: 800;
}

.order-band {
  background: var(--navy);
  color: #ffffff;
}

.order-inner {
  display: grid;
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
  padding: 66px 0;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 0.66fr);
  align-items: center;
  gap: 48px;
}

.order-copy h2 {
  margin: 0 0 13px;
  font-size: clamp(29px, 4vw, 40px);
  line-height: 1.2;
}

.order-copy p {
  margin: 0;
  color: #d9e7ff;
  font-size: 17px;
  line-height: 1.75;
}

.order-facts {
  display: grid;
  margin: 23px 0 0;
  padding: 0;
  list-style: none;
  gap: 10px;
}

.order-facts li {
  position: relative;
  padding-inline-start: 22px;
  color: #f4f8ff;
}

.order-facts li::before {
  position: absolute;
  inset-inline-start: 0;
  color: #68d5ad;
  content: "✓";
  font-weight: 900;
}

.contact-link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  margin-top: 18px;
  border-bottom: 1px solid currentColor;
  color: #dce9ff;
  font-weight: 800;
  text-decoration: none;
}

.contact-link:focus-visible {
  outline: 3px solid #7ee2ae;
  outline-offset: 4px;
}

.price-panel {
  border: 1px solid rgba(255, 255, 255, 0.28);
  border-radius: 8px;
  background: #ffffff;
  color: var(--ink);
  padding: 24px;
}

.price-line {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 11px 0;
  border-bottom: 1px solid var(--line);
}

.price-line span:first-child {
  color: var(--muted);
}

.price-line strong {
  color: var(--navy);
}

.price-line.total {
  margin-bottom: 18px;
  border-bottom: 0;
  font-size: 19px;
}

.price-panel .primary-action {
  width: 100%;
}

.faq-list {
  display: grid;
  max-width: 900px;
  margin: 0 auto;
  gap: 10px;
}

.faq-list details {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #ffffff;
}

.faq-list summary {
  min-height: 54px;
  padding: 16px 18px;
  color: var(--navy);
  cursor: pointer;
  font-size: 16px;
  font-weight: 900;
}

.faq-list details p {
  margin: 0;
  padding: 0 18px 18px;
  color: var(--muted);
  line-height: 1.7;
}

.guide-links {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.guide-link {
  display: block;
  min-height: 144px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #ffffff;
  padding: 24px;
  text-decoration: none;
}

.guide-link strong {
  display: block;
  margin-bottom: 8px;
  color: var(--navy);
  font-size: 19px;
}

.guide-link span {
  color: var(--muted);
  line-height: 1.65;
}

.guide-link:hover {
  border-color: #96b7e7;
}

.site-footer {
  background: #0d1f3b;
  color: #b7c7df;
}

.footer-inner {
  display: flex;
  width: min(1120px, calc(100% - 40px));
  min-height: 90px;
  margin: 0 auto;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  font-size: 14px;
}

.footer-nav {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

.footer-nav a {
  color: #e1ebfa;
  font-weight: 700;
  text-underline-offset: 4px;
}

@media (max-width: 860px) {
  .hero-inner,
  .installation-inner,
  .spec-layout,
  .order-inner {
    grid-template-columns: 1fr;
  }

  .hero-inner {
    gap: 34px;
  }

  .hero-media {
    width: min(520px, 100%);
    margin: 0 auto;
  }

  .problem-points,
  .parts-grid {
    grid-template-columns: 1fr;
  }

  .problem-point {
    min-height: auto;
  }

  .parts-grid {
    max-width: 640px;
    margin: 0 auto;
  }

  .order-inner,
  .installation-inner {
    gap: 32px;
  }
}

@media (max-width: 620px) {
  .header-inner {
    width: calc(100% - 24px);
    min-height: 62px;
    gap: 8px;
  }

  .brand-mark {
    width: 36px;
    height: 36px;
  }

  .brand-name {
    font-size: 15px;
  }

  .brand-tagline {
    display: none;
  }

  .language-link,
  .header-order {
    min-height: 40px;
    padding: 8px 11px;
    font-size: 12px;
  }

  .hero-inner {
    width: calc(100% - 28px);
    min-height: 0;
    padding: 34px 0 40px;
  }

  .hero h1 {
    margin-top: 14px;
    font-size: 34px;
  }

  .hero-lead {
    font-size: 16px;
  }

  .hero-actions {
    display: grid;
    grid-template-columns: 1fr;
  }

  .primary-action,
  .secondary-action {
    width: 100%;
  }

  .hero-media img {
    height: auto;
    aspect-ratio: 820 / 998;
    object-position: 50% 16%;
  }

  .hero-notes {
    display: grid;
    grid-template-columns: 1fr;
  }

  .section {
    width: calc(100% - 28px);
    padding: 52px 0;
  }

  .section-heading {
    margin-bottom: 24px;
  }

  .section-heading h2 {
    font-size: 29px;
  }

  .section-heading p {
    font-size: 15px;
  }

  .comparison-grid {
    grid-template-columns: 1fr;
  }

  .comparison-grid img {
    aspect-ratio: 11 / 15;
  }

  .installation-inner,
  .order-inner {
    width: calc(100% - 28px);
    padding: 52px 0;
  }

  .installation-copy h2,
  .order-copy h2 {
    font-size: 29px;
  }

  .video-frame {
    width: min(100%, 430px);
    margin: 0 auto;
  }

  .spec-row {
    grid-template-columns: 1fr;
    gap: 5px;
  }

  .guide-links {
    grid-template-columns: 1fr;
  }

  .footer-inner {
    width: calc(100% - 28px);
    padding: 24px 0;
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}