:root {
  --ink: #10151d;
  --muted: #647080;
  --line: #dbe2ea;
  --paper: #ffffff;
  --soft: #f3f6f9;
  --navy: #0d3158;
  --blue: #176ab4;
  --orange: #d67a21;
  --green: #24705b;
  --shadow: 0 18px 50px rgba(16, 21, 29, 0.12);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: Arial, Helvetica, sans-serif;
  line-height: 1.55;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

.topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 14px clamp(20px, 4vw, 64px);
  background: rgba(255, 255, 255, 0.72);
  border-bottom: 1px solid rgba(219, 226, 234, 0.72);
  box-shadow: 0 10px 30px rgba(16, 21, 29, 0.08);
  backdrop-filter: blur(18px) saturate(145%);
  -webkit-backdrop-filter: blur(18px) saturate(145%);
}
.brand { display: flex; align-items: center; gap: 12px; min-width: 230px; }
.brand-mark {
  display: grid;
  width: 44px;
  height: 44px;
  place-items: center;
  color: #fff;
  background: var(--navy);
  border-radius: 7px;
  font-weight: 800;
}
.brand small { display: block; color: var(--muted); font-size: 12px; }
.nav { display: flex; gap: 22px; color: var(--muted); font-size: 14px; }
.nav a:hover { color: var(--blue); }
.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}
.lang-switcher {
  display: inline-flex;
  padding: 3px;
  background: var(--soft);
  border: 1px solid var(--line);
  border-radius: 7px;
}
.lang-switcher button {
  min-width: 46px;
  min-height: 34px;
  padding: 6px 10px;
  color: var(--muted);
  background: transparent;
  border: 0;
  border-radius: 5px;
  font: inherit;
  font-size: 13px;
  font-weight: 800;
  cursor: pointer;
}
.lang-switcher button.active {
  color: #fff;
  background: var(--navy);
}
.cta,
.whatsapp-link,
.outline-link,
.quote-form button,
.hero-search button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 10px 16px;
  color: #fff;
  background: var(--blue);
  border: 0;
  border-radius: 6px;
  font-weight: 800;
  cursor: pointer;
}

.whatsapp-link {
  background: #1f9d63;
}

.whatsapp-link:hover {
  background: #147a4b;
}

.outline-link {
  color: #fff;
  background: rgba(255, 255, 255, 0.14);
  border: 1px solid rgba(255, 255, 255, 0.32);
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(340px, 0.95fr);
  gap: 42px;
  align-items: center;
  min-height: 720px;
  padding: 76px clamp(20px, 5vw, 74px);
  background:
    linear-gradient(120deg, rgba(13, 49, 88, 0.94), rgba(13, 49, 88, 0.76)),
    url("https://zhongdingmachinery.com/wp-content/uploads/2025/04/banner-1.webp") center / cover;
  color: #fff;
}
.kicker {
  margin: 0 0 10px;
  color: var(--orange);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}
h1, h2, h3, p { margin-top: 0; }
h1 {
  max-width: 850px;
  margin-bottom: 18px;
  font-size: clamp(42px, 6.6vw, 76px);
  line-height: 1.02;
  letter-spacing: 0;
}
h2 {
  margin-bottom: 12px;
  font-size: clamp(30px, 4vw, 48px);
  line-height: 1.08;
  letter-spacing: 0;
}
h3 { font-size: 20px; line-height: 1.2; }
.hero-copy p:not(.kicker) {
  max-width: 720px;
  color: rgba(255, 255, 255, 0.86);
  font-size: 18px;
}
.hero-search {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 10px;
  max-width: 640px;
  margin: 26px 0;
}
input {
  width: 100%;
  min-height: 46px;
  padding: 11px 13px;
  border: 1px solid var(--line);
  border-radius: 6px;
  font: inherit;
}
.hero-metrics { display: flex; flex-wrap: wrap; gap: 12px; }
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: -8px 0 24px;
}
.hero-metrics span {
  padding: 12px 14px;
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 7px;
}
.hero-metrics strong { display: block; font-size: 24px; }
.hero-card {
  overflow: hidden;
  background: #fff;
  border-radius: 8px;
  box-shadow: var(--shadow);
  color: var(--ink);
}
.hero-card img { aspect-ratio: 4 / 3; object-fit: cover; }
.hero-card div { padding: 20px; }
.hero-card p { color: var(--muted); margin-bottom: 0; }

.category-strip {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 1px;
  margin: 0 clamp(20px, 4vw, 64px);
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow: hidden;
  transform: translateY(-32px);
  box-shadow: var(--shadow);
}
.category-strip a {
  min-height: 78px;
  display: grid;
  place-items: center;
  padding: 16px;
  background: #fff;
  color: var(--navy);
  font-weight: 800;
  text-align: center;
}

.section { padding: 64px clamp(20px, 4vw, 64px); }
.section-head {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 520px);
  gap: 32px;
  align-items: end;
  margin-bottom: 26px;
}
.section-head p, .matrix p, .quality p, .blog-grid p, .faq p, .case-grid p { color: var(--muted); }
.inventory-tools {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(240px, 340px) auto;
  gap: 14px;
  align-items: end;
  margin-bottom: 22px;
}
.filter-row { display: flex; flex-wrap: wrap; gap: 8px; }
.filter-row button {
  min-height: 38px;
  padding: 8px 14px;
  color: var(--muted);
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 999px;
  cursor: pointer;
}
.filter-row button.active, .filter-row button:hover {
  color: #fff;
  background: var(--navy);
  border-color: var(--navy);
}
.inventory-search {
  display: grid;
  gap: 6px;
  font-size: 13px;
  font-weight: 800;
}
.inventory-search input {
  min-height: 40px;
}
.result-count {
  color: var(--navy);
  font-size: 14px;
  white-space: nowrap;
}
.grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}
.card {
  overflow: hidden;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 8px;
}
.card-image {
  aspect-ratio: 4 / 3;
  background: var(--soft) center / cover;
  display: block;
  transition: filter .2s ease, transform .2s ease;
}
.card:hover .card-image {
  filter: brightness(1.04);
  transform: scale(1.015);
}
.card-body { padding: 18px; }
.tags { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 12px; }
.tag {
  padding: 4px 8px;
  color: var(--navy);
  background: #e9f2fb;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 800;
}
.card p { color: var(--muted); }
.specs {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
  margin-top: 14px;
}
.specs div {
  padding: 9px;
  background: var(--soft);
  border-radius: 6px;
  font-size: 13px;
}
.specs strong { display: block; color: var(--ink); }
.card-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin-top: 14px;
}
.card-actions a {
  min-height: 38px;
  padding: 8px 10px;
  border-radius: 6px;
  text-align: center;
  font-weight: 800;
}
.card-actions a:first-child {
  color: #fff;
  background: #1f9d63;
}
.card-actions a:last-child {
  color: var(--navy);
  border: 1px solid var(--line);
}

.matrix, .quality, .cases { background: var(--soft); }
.matrix-grid, .case-grid, .blog-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}
.matrix-grid article, .case-grid article, .blog-grid article {
  padding: 22px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 8px;
}
.deal-panel {
  display: grid;
  grid-template-columns: minmax(260px, 360px) minmax(0, 1fr);
  gap: 18px;
  margin-top: 18px;
  padding: 22px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 8px;
}
.deal-intro span,
.deal-list small {
  display: inline-block;
  margin-bottom: 10px;
  color: var(--green);
  font-size: 12px;
  font-weight: 800;
  text-transform: uppercase;
}
.deal-intro h3 { margin-bottom: 10px; }
.deal-intro p,
.deal-list p,
.testimonial-grid p,
.testimonial-grid blockquote { color: var(--muted); }
.deal-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}
.deal-list article {
  padding: 16px;
  background: var(--soft);
  border: 1px solid var(--line);
  border-radius: 8px;
}
.deal-list strong { display: block; margin-bottom: 8px; }
.testimonial-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin-top: 16px;
}
.testimonial-grid figure,
.case-interaction {
  margin: 0;
  padding: 22px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 8px;
}
.testimonial-grid blockquote {
  margin: 0 0 16px;
  font-size: 17px;
}
.testimonial-grid figcaption {
  color: var(--navy);
  font-weight: 800;
}
.case-interaction {
  display: grid;
  align-content: space-between;
  gap: 12px;
}
.case-interaction > strong {
  color: var(--navy);
  font-size: 20px;
}
.case-interaction div {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.outline-case-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 10px 16px;
  color: var(--navy);
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 6px;
  font-weight: 800;
}
.quality {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(360px, 1.1fr);
  gap: 38px;
}
.inspection-list {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 24px 24px 24px 44px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 8px;
}
.inspection-list li { color: var(--muted); }
.inspection-list strong { color: var(--ink); }

.parts-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}
.parts-grid span {
  padding: 18px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--navy);
  font-weight: 800;
}
.faq {
  display: grid;
  grid-template-columns: minmax(300px, 420px) minmax(0, 1fr);
  gap: 34px;
  background: #10151d;
  color: #fff;
}
.faq-grid { display: grid; gap: 12px; }
details {
  padding: 18px 20px;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 8px;
}
summary { cursor: pointer; font-weight: 800; }
.blog-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.blog-grid span {
  display: inline-block;
  margin-bottom: 12px;
  color: var(--green);
  font-size: 13px;
  font-weight: 800;
  text-transform: uppercase;
}
.quote {
  display: grid;
  grid-template-columns: minmax(300px, 520px) minmax(0, 1fr);
  gap: 34px;
  padding: 72px clamp(20px, 4vw, 64px);
  background: #eef4f1;
}
.quote p { color: var(--muted); }
.quote-form {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  padding: 24px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 8px;
}
label { display: grid; gap: 6px; font-size: 14px; font-weight: 800; }
.quote-form button { grid-column: 1 / -1; }
.form-whatsapp {
  grid-column: 1 / -1;
  min-height: 42px;
}
.quote-status {
  grid-column: 1 / -1;
  min-height: 22px;
  margin: 0;
  color: var(--green);
  font-weight: 800;
}
.float-whatsapp {
  position: fixed;
  right: 18px;
  bottom: 18px;
  z-index: 40;
  min-height: 48px;
  padding: 12px 18px;
  box-shadow: var(--shadow);
}
.footer {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  padding: 30px clamp(20px, 4vw, 64px);
  background: #0a1118;
  color: rgba(255, 255, 255, 0.82);
}
.footer p { margin: 4px 0 0; }
.footer div:last-child { display: flex; gap: 18px; }

@media (max-width: 1000px) {
  .nav { display: none; }
  .topbar { flex-wrap: wrap; }
  .hero, .section-head, .quality, .faq, .quote { grid-template-columns: 1fr; }
  .inventory-tools { grid-template-columns: 1fr; }
  .grid, .blog-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .matrix-grid, .case-grid, .parts-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .deal-panel, .testimonial-grid { grid-template-columns: 1fr; }
  .deal-list { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .category-strip { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 640px) {
  .topbar { align-items: flex-start; }
  .header-actions { width: 100%; justify-content: space-between; }
  .topbar .cta { display: none; }
  .brand { min-width: 0; }
  h1 { font-size: 42px; }
  .hero-search, .grid, .matrix-grid, .case-grid, .deal-list, .parts-grid, .blog-grid, .quote-form { grid-template-columns: 1fr; }
  .card-actions { grid-template-columns: 1fr; }
  .category-strip { transform: translateY(-18px); }
  .footer { flex-direction: column; }
}