:root {
  --blue-950: #07335f;
  --blue-900: #074a84;
  --blue-800: #0b5f9f;
  --blue-100: #eaf4fb;
  --blue-50: #f4f9fc;
  --orange: #f47b20;
  --ink: #17283a;
  --muted: #607386;
  --line: #dce6ee;
  --surface: #ffffff;
  --page: #f5f8fa;
  --container: 1180px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: auto;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--surface);
  font-family: "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.75;
  letter-spacing: 0;
}

img {
  display: block;
  width: 100%;
  height: auto;
}

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

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

:focus-visible {
  outline: 3px solid #ff9c4a;
  outline-offset: 3px;
}

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

.topbar {
  color: #fff;
  background: var(--blue-900);
  font-size: 13px;
}

.topbar .container {
  min-height: 38px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.topbar-meta {
  display: flex;
  align-items: center;
  gap: 24px;
}

.site-header {
  position: relative;
  z-index: 5;
  background: #fff;
  border-bottom: 1px solid var(--line);
}

.header-inner {
  min-height: 82px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
}

.brand {
  display: flex;
  align-items: center;
  min-width: 270px;
}

.brand-name {
  display: block;
  color: var(--blue-950);
  font-size: 21px;
  font-weight: 800;
  line-height: 1.25;
}

.brand-en {
  display: block;
  margin-top: 3px;
  color: #73879b;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 34px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.nav-list a {
  display: flex;
  align-items: center;
  min-height: 82px;
  border-bottom: 3px solid transparent;
  color: #273b4e;
  font-size: 15px;
  font-weight: 700;
}

.nav-list a:hover,
.nav-list a[aria-current="page"] {
  color: var(--blue-800);
  border-bottom-color: var(--orange);
}

.menu-button {
  display: none;
  min-width: 52px;
  min-height: 44px;
  border: 1px solid var(--line);
  border-radius: 4px;
  color: var(--blue-950);
  background: #fff;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
}

.hero {
  min-height: 610px;
  display: flex;
  align-items: center;
  background-image: url("../images/hero.webp");
  background-position: center;
  background-size: cover;
}

.hero-mobile-image {
  display: none;
}

.hero-copy {
  width: min(600px, 60%);
  padding: 88px 0;
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--blue-800);
  font-size: 13px;
  font-weight: 800;
  text-transform: uppercase;
}

.hero h1 {
  margin: 0;
  color: var(--blue-950);
  font-size: clamp(42px, 5vw, 68px);
  line-height: 1.16;
  letter-spacing: 0;
}

.hero h1 strong {
  color: var(--orange);
}

.hero h1 > span {
  display: block;
}

.hero-brand-prefix {
  display: none;
}

.hero-lead {
  margin: 22px 0 12px;
  color: #27445d;
  font-size: 21px;
  font-weight: 700;
}

.hero-desc {
  max-width: 550px;
  margin: 0 0 30px;
  color: #506579;
}

.button {
  min-height: 46px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 24px;
  border: 1px solid var(--blue-800);
  border-radius: 4px;
  color: #fff;
  background: var(--blue-800);
  font-weight: 700;
}

.button:hover {
  color: #fff;
  background: var(--blue-950);
  border-color: var(--blue-950);
}

.button-orange {
  background: var(--orange);
  border-color: var(--orange);
}

.button-outline {
  color: var(--blue-800);
  background: #fff;
}

.section {
  padding: 82px 0;
}

.section-tint {
  background: var(--blue-50);
}

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

.section-heading-row {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 24px;
}

.section-heading h2 {
  position: relative;
  margin: 0;
  padding-bottom: 13px;
  color: var(--blue-950);
  font-size: 34px;
  line-height: 1.2;
}

.section-heading h2::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 42px;
  height: 3px;
  background: var(--orange);
}

.section-heading p {
  max-width: 700px;
  margin: 12px 0 0;
  color: var(--muted);
}

.about-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  align-items: start;
  gap: 24px 60px;
}

.about-heading {
  grid-column: 1 / -1;
  margin-bottom: 10px;
}

.about-copy p {
  margin: 0 0 18px;
  color: #4d6275;
}

.about-image {
  position: relative;
  align-self: stretch;
  min-height: 280px;
  margin: 0;
  border: 1px solid var(--line);
  background: #fff;
  padding: 10px;
}

.about-image img {
  position: absolute;
  inset: 10px;
  width: calc(100% - 20px);
  height: calc(100% - 20px);
  object-fit: cover;
}

.about-copy p:last-child {
  margin-bottom: 0;
}

.about-action {
  justify-self: start;
}

.product-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}

.product-card {
  min-width: 0;
  border: 1px solid var(--line);
  border-radius: 6px;
  overflow: hidden;
  background: #fff;
}

.product-card:hover {
  border-color: #8db6d4;
}

.product-card img {
  aspect-ratio: 4 / 3;
  object-fit: cover;
  background: #f7f7f7;
}

.product-card-body {
  min-height: 175px;
  padding: 22px;
}

.product-card h3 {
  margin: 0 0 7px;
  color: var(--blue-950);
  font-size: 20px;
}

.product-card p {
  margin: 0 0 16px;
  color: var(--muted);
  font-size: 14px;
}

.text-link {
  color: var(--blue-800);
  font-weight: 800;
}

.application-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 14px;
}

.application-item {
  border-bottom: 3px solid var(--blue-800);
  background: #fff;
}

.application-item img {
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.application-item h3 {
  margin: 0;
  padding: 17px 12px;
  color: var(--blue-950);
  font-size: 16px;
  text-align: center;
}

.advantage-band {
  color: #fff;
  background: var(--blue-900);
}

.advantage-list {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
}

.advantage {
  padding: 31px 30px;
  border-left: 1px solid rgba(255, 255, 255, 0.22);
}

.advantage:last-child {
  border-right: 1px solid rgba(255, 255, 255, 0.22);
}

.advantage strong {
  display: block;
  margin-bottom: 5px;
  font-size: 18px;
}

.advantage span {
  color: #d3e4f1;
  font-size: 13px;
}

.factory-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}

.factory-item {
  margin: 0;
  border: 1px solid var(--line);
  background: #fff;
}

.factory-item img {
  aspect-ratio: 10 / 7;
  object-fit: cover;
}

.factory-item figcaption {
  padding: 13px 16px;
  color: var(--blue-950);
  font-size: 20px;
  font-weight: 700;
  text-align: center;
}

.contact-band {
  color: #fff;
  background: var(--blue-950);
}

.contact-inner {
  min-height: 214px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 60px;
}

.contact-band h2 {
  margin: 0 0 8px;
  font-size: 31px;
}

.contact-band p {
  margin: 0;
  color: #c6d9e8;
}

.contact-details {
  min-width: 340px;
  padding-left: 34px;
  border-left: 1px solid rgba(255, 255, 255, 0.24);
}

.contact-details strong,
.contact-details span {
  display: block;
}

.contact-details strong {
  margin-bottom: 3px;
  color: #ff9a45;
  font-size: 30px;
  line-height: 1.35;
}

.contact-details span {
  color: #d7e5ef;
  font-size: 14px;
}

.site-footer {
  padding: 35px 0;
  color: #bfd1df;
  background: #052747;
  font-size: 13px;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 36px;
}

.footer-brand {
  color: #fff;
  font-size: 18px;
  font-weight: 800;
}

.footer-meta {
  text-align: right;
}

.page-hero {
  padding: 56px 0;
  color: #fff;
  background: var(--blue-900);
}

.breadcrumbs {
  margin-bottom: 12px;
  color: #c5dced;
  font-size: 13px;
}

.page-hero h1 {
  margin: 0;
  font-size: 40px;
  line-height: 1.2;
}

.page-hero p {
  max-width: 720px;
  margin: 12px 0 0;
  color: #dbe9f3;
}

.product-overview {
  display: grid;
  grid-template-columns: minmax(360px, 0.9fr) 1.1fr;
  gap: 58px;
  align-items: center;
}

.product-main-image {
  border: 1px solid var(--line);
  background: #fff;
  padding: 12px;
}

.product-main-image img {
  aspect-ratio: 1;
  object-fit: cover;
}

.product-summary h2 {
  margin: 0 0 15px;
  color: var(--blue-950);
  font-size: 32px;
}

.product-summary > p {
  margin: 0 0 22px;
  color: var(--muted);
}

.fact-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  margin: 0 0 28px;
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}

.fact-list div {
  padding: 15px 18px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.fact-list dt {
  color: var(--muted);
  font-size: 12px;
}

.fact-list dd {
  margin: 3px 0 0;
  color: var(--blue-950);
  font-weight: 700;
}

.usage-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
}

.usage-item {
  min-width: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-top: 3px solid var(--orange);
  border-radius: 4px;
  background: #fff;
}

.usage-image {
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.usage-content {
  min-height: 168px;
  padding: 21px 20px 24px;
}

.usage-item h3 {
  margin: 0 0 8px;
  color: var(--blue-950);
  font-size: 18px;
}

.usage-item p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

.info-table {
  width: 100%;
  border-collapse: collapse;
  border: 1px solid var(--line);
  background: #fff;
}

.info-table th,
.info-table td {
  padding: 15px 18px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

.info-table th {
  color: var(--blue-950);
  background: #edf5fa;
}

.notice {
  margin-top: 18px;
  padding: 16px 20px;
  border-left: 4px solid var(--orange);
  color: #53697c;
  background: #fff8f2;
  font-size: 14px;
}

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

.related-product {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 14px;
  border: 1px solid var(--line);
  background: #fff;
}

.related-product img {
  width: 90px;
  height: 74px;
  object-fit: cover;
}

.related-product strong {
  display: block;
  color: var(--blue-950);
}

.related-product span {
  color: var(--blue-800);
  font-size: 13px;
  font-weight: 700;
}

@media (min-width: 981px) {
  .topbar .container {
    min-height: 76px;
  }

  .topbar-message {
    font-size: 0;
  }

  .topbar-message::before {
    content: "濮阳市卓唯化工有限公司";
    color: #ffad66;
    font-size: 32px;
    font-weight: 800;
  }

  .topbar-meta span:first-child {
    display: none;
  }

  .topbar-meta span:last-child {
    display: grid;
    grid-template-columns: auto;
    gap: 2px;
    padding-left: 28px;
    border-left: 1px solid rgba(255, 255, 255, 0.34);
    color: rgba(255, 255, 255, 0.78);
    font-size: 13px;
    font-weight: 800;
    line-height: 1.1;
  }

  .topbar-meta span:last-child a {
    color: #ffad66;
    font-size: 28px;
    line-height: 1.1;
  }

  .header-inner {
    min-height: 68px;
    justify-content: center;
  }

  .brand {
    display: none;
  }

  .nav-list a {
    min-height: 68px;
  }

  .hero h1 {
    width: max-content;
    max-width: 430px;
    font-size: 44px;
    line-height: 1.08;
  }

  .hero h1 strong {
    color: var(--blue-950);
    font-weight: 700;
  }

  .hero-copy > .eyebrow {
    display: none;
  }

  .hero-brand-prefix {
    display: block;
    margin-bottom: 6px;
    color: #e96712;
    font-size: 66px;
    font-weight: 800;
    line-height: 0.98;
    letter-spacing: 0;
  }

  .hero-lead {
    margin-top: 18px;
    font-size: 18px;
  }
}

@media (max-width: 980px) {
  .container {
    width: min(calc(100% - 32px), var(--container));
  }

  .menu-button {
    display: block;
  }

  .site-nav {
    display: none;
    position: absolute;
    top: 82px;
    left: 0;
    right: 0;
    padding: 10px 16px 18px;
    border-top: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
    background: #fff;
  }

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

  .nav-list {
    display: grid;
    gap: 0;
  }

  .nav-list a {
    min-height: 48px;
    border-bottom: 1px solid var(--line);
  }

  .hero {
    min-height: 550px;
    background-position: 61% center;
  }

  .hero-copy {
    width: 68%;
  }

  .advantage-list {
    grid-template-columns: repeat(2, 1fr);
  }

  .advantage:nth-child(3) {
    border-top: 1px solid var(--line);
  }

  .about-grid,
  .product-overview {
    grid-template-columns: 1fr;
  }

  .about-image {
    min-height: 0;
  }

  .about-image img {
    position: static;
    width: 100%;
    height: auto;
    aspect-ratio: 4 / 3;
  }

  .product-grid,
  .factory-grid,
  .usage-grid,
  .related-products {
    grid-template-columns: repeat(2, 1fr);
  }

  .application-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 680px) {
  body {
    font-size: 15px;
  }

  .topbar .container {
    justify-content: center;
    text-align: center;
  }

  .topbar-meta span:first-child,
  .topbar-message {
    display: none;
  }

  .header-inner {
    min-height: 72px;
  }

  .brand {
    min-width: 0;
  }

  .brand-name {
    max-width: 220px;
    font-size: 17px;
  }

  .brand-en {
    display: none;
  }

  .site-nav {
    top: 72px;
  }

  .hero {
    min-height: 0;
    display: block;
    background: var(--blue-50);
  }

  .hero-mobile-image {
    display: block;
    aspect-ratio: 16 / 9;
    object-fit: cover;
    object-position: 64% center;
  }

  .hero-copy {
    width: 100%;
    padding: 42px 0 54px;
  }

  .hero h1 {
    font-size: 39px;
  }

  .hero-lead {
    font-size: 18px;
  }

  .product-grid,
  .application-grid,
  .advantage-list,
  .factory-grid,
  .usage-grid,
  .related-products {
    grid-template-columns: 1fr;
  }

  .advantage,
  .advantage:last-child {
    border-right: 1px solid var(--line);
  }

  .section {
    padding: 58px 0;
  }

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

  .section-heading-row,
  .contact-inner,
  .footer-inner {
    align-items: flex-start;
    flex-direction: column;
  }

  .about-grid {
    gap: 32px;
  }

  .product-card-body {
    min-height: 0;
  }

  .application-item h3 {
    font-size: 17px;
  }

  .contact-inner {
    padding: 48px 0;
    gap: 30px;
  }

  .contact-details {
    min-width: 0;
    width: 100%;
    padding: 24px 0 0;
    border-top: 1px solid rgba(255, 255, 255, 0.24);
    border-left: 0;
  }

  .contact-details strong {
    font-size: 27px;
  }

  .footer-meta {
    text-align: left;
  }

  .page-hero {
    padding: 42px 0;
  }

  .page-hero h1 {
    font-size: 32px;
  }

  .product-overview {
    gap: 32px;
  }

  .product-summary h2 {
    font-size: 27px;
  }

  .fact-list {
    grid-template-columns: 1fr;
  }

  .info-table {
    display: block;
    overflow-x: auto;
    white-space: nowrap;
  }
}