:root {
  --ink: #142033;
  --muted: #5f6c7b;
  --line: #dbe2ea;
  --panel: #f6f8fb;
  --brand: #0f5f75;
  --brand-dark: #0a3e4d;
  --accent: #f0643a;
  --white: #ffffff;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  font-family: Arial, Helvetica, sans-serif;
  line-height: 1.6;
  background: var(--white);
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 76px;
  padding: 0 6vw;
  background: rgba(255, 255, 255, 0.96);
  border-bottom: 1px solid var(--line);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 22px;
  font-weight: 800;
  color: var(--brand-dark);
}

.brand-mark {
  display: inline-grid;
  place-items: center;
  width: 38px;
  height: 38px;
  color: var(--white);
  background: var(--brand);
  font-size: 13px;
  border-radius: 6px;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 24px;
  font-size: 15px;
  color: var(--muted);
}

.main-nav a:hover {
  color: var(--brand);
}

.main-nav a[aria-current="page"] {
  color: var(--brand-dark);
  font-weight: 700;
}

.nav-cta,
.button,
.quote-form button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 18px;
  border-radius: 4px;
  font-weight: 700;
}

.nav-cta,
.button.primary,
.quote-form button {
  color: var(--white);
  background: var(--accent);
}

.button.secondary {
  color: var(--white);
  border: 1px solid rgba(255, 255, 255, 0.72);
}

.text-link {
  display: inline-flex;
  margin-top: 22px;
  color: var(--brand);
  font-weight: 800;
}

.hero {
  min-height: 680px;
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(300px, 0.8fr);
  align-items: end;
  gap: 40px;
  padding: 100px 6vw 76px;
  color: var(--white);
  background:
    linear-gradient(90deg, rgba(12, 34, 47, 0.95) 0%, rgba(12, 34, 47, 0.82) 47%, rgba(12, 34, 47, 0.38) 100%),
    url("./assets/hero-pvc-strip-curtain.jpg") center/cover;
}

.hero-content {
  max-width: 820px;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--accent);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

.hero h1 {
  margin: 0;
  max-width: 840px;
  font-size: clamp(42px, 6vw, 72px);
  line-height: 1.04;
  letter-spacing: 0;
}

.hero-copy {
  max-width: 640px;
  margin: 24px 0 0;
  color: rgba(255, 255, 255, 0.86);
  font-size: 19px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 34px;
}

.hero-panel {
  display: grid;
  gap: 12px;
  padding: 18px;
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.26);
  backdrop-filter: blur(8px);
  border-radius: 6px;
}

.hero-panel div {
  padding: 18px;
  background: rgba(255, 255, 255, 0.12);
  border-radius: 4px;
}

.hero-panel strong,
.hero-panel span {
  display: block;
}

.hero-panel span {
  color: rgba(255, 255, 255, 0.78);
  font-size: 14px;
}

.section {
  padding: 86px 6vw;
}

.page-hero {
  padding: 86px 6vw 72px;
  color: var(--white);
  background:
    linear-gradient(90deg, rgba(12, 34, 47, 0.96), rgba(12, 34, 47, 0.74)),
    url("./assets/hero-pvc-strip-curtain.jpg") center/cover;
}

.page-hero h1 {
  max-width: 980px;
  margin: 0;
  font-size: clamp(40px, 5vw, 64px);
  line-height: 1.06;
  letter-spacing: 0;
}

.page-hero p {
  max-width: 720px;
  margin-top: 20px;
  color: rgba(255, 255, 255, 0.82);
  font-size: 18px;
}

.intro,
.quality,
.contact {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(300px, 1.1fr);
  gap: 56px;
  align-items: start;
}

h2 {
  margin: 0;
  font-size: clamp(30px, 4vw, 46px);
  line-height: 1.12;
  letter-spacing: 0;
}

h3 {
  margin: 0 0 12px;
  font-size: 22px;
}

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

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

.product-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 18px;
}

.product-card {
  overflow: hidden;
  min-height: 430px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--white);
}

.product-card h3,
.product-card p,
.product-card ul,
.product-card .text-link {
  margin-left: 22px;
  margin-right: 22px;
}

.product-card h3 {
  margin-top: 22px;
}

.product-card ul {
  padding-left: 18px;
  margin-top: 18px;
  color: var(--muted);
}

.product-card .text-link {
  margin-bottom: 24px;
}

.product-thumb,
.application-image,
.detail-media img {
  display: block;
  width: 100%;
  object-fit: cover;
}

.product-thumb {
  aspect-ratio: 4 / 3;
  border-bottom: 1px solid var(--line);
}

.detail-grid {
  display: grid;
  gap: 18px;
}

.detail-card {
  display: grid;
  grid-template-columns: minmax(0, 0.85fr) minmax(260px, 0.85fr) minmax(300px, 1fr);
  gap: 34px;
  align-items: start;
  padding: 34px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--white);
}

.detail-media {
  overflow: hidden;
  margin: 0;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--white);
}

.detail-media img {
  aspect-ratio: 4 / 3;
}

.detail-card:nth-child(even),
.soft-band {
  background: var(--panel);
}

.detail-card ul,
.check-list {
  margin: 20px 0 0;
  padding-left: 18px;
  color: var(--muted);
}

.spec-list {
  display: grid;
  gap: 10px;
  margin: 0;
}

.spec-list div {
  display: grid;
  grid-template-columns: 150px 1fr;
  gap: 18px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
}

.spec-list dt {
  color: var(--ink);
  font-weight: 800;
}

.spec-list dd {
  margin: 0;
  color: var(--muted);
}

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

.application-card {
  overflow: hidden;
  min-height: 260px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--white);
}

.application-card h3,
.application-card p,
.application-card span {
  margin-left: 24px;
  margin-right: 24px;
}

.application-card span {
  display: inline-flex;
  margin-top: 24px;
  margin-bottom: 28px;
  color: var(--brand);
  font-weight: 800;
}

.application-image {
  aspect-ratio: 16 / 10;
  border-bottom: 1px solid var(--line);
}

.process-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}

.process-step {
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--white);
}

.process-step strong {
  display: block;
  margin-bottom: 12px;
  color: var(--accent);
}

.split-section {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(320px, 1.1fr);
  gap: 56px;
  align-items: start;
}

.rfq-panel {
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--panel);
}

.solutions {
  background: var(--panel);
}

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

.solution-list div,
.quality-grid div {
  padding: 28px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 6px;
}

.solution-list span {
  display: block;
  margin-bottom: 30px;
  color: var(--brand);
  font-weight: 800;
}

.quality-grid {
  display: grid;
  gap: 16px;
}

.quality-grid div {
  overflow: hidden;
}

.quality-grid strong {
  display: block;
  margin-bottom: 8px;
  font-size: 18px;
}

.quality-image {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 7;
  margin: 0 0 20px;
  object-fit: cover;
  border-radius: 4px;
  border: 1px solid var(--line);
}

.contact {
  background: var(--brand-dark);
}

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

.contact p {
  color: rgba(255, 255, 255, 0.74);
}

.quote-form {
  display: grid;
  gap: 16px;
  padding: 28px;
  background: var(--white);
  border-radius: 6px;
}

.quote-form label {
  display: grid;
  gap: 7px;
  color: var(--ink);
  font-weight: 700;
  font-size: 14px;
}

.quote-form input,
.quote-form select,
.quote-form textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 12px 13px;
  color: var(--ink);
  font: inherit;
}

.quote-form button {
  border: 0;
  cursor: pointer;
  font: inherit;
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  padding: 34px 6vw;
  border-top: 1px solid var(--line);
}

.footer-links {
  display: flex;
  gap: 18px;
  color: var(--muted);
}

@media (max-width: 1080px) {
  .product-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .hero,
  .intro,
  .quality,
  .contact,
  .detail-card,
  .split-section {
    grid-template-columns: 1fr;
  }

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

@media (max-width: 760px) {
  .site-header {
    position: static;
    align-items: flex-start;
    flex-direction: column;
    padding: 18px 5vw;
  }

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

  .nav-cta {
    width: 100%;
  }

  .hero {
    min-height: auto;
    padding: 70px 5vw;
  }

  .hero h1 {
    font-size: 40px;
  }

  .section {
    padding: 60px 5vw;
  }

  .product-grid,
  .solution-list,
  .application-grid,
  .process-grid {
    grid-template-columns: 1fr;
  }

  .spec-list div {
    grid-template-columns: 1fr;
    gap: 4px;
  }

  .site-footer {
    flex-direction: column;
  }
}