:root {
  --ink: #17212b;
  --muted: #68737d;
  --paper: #f5f4ef;
  --panel: #ffffff;
  --line: rgba(23, 33, 43, .12);
  --accent: #1f6b4f;
  --accent-soft: #e7f0ea;
  --blue-soft: #e9eef3;
  --shadow: 0 18px 48px rgba(29, 38, 46, .12);
  font-family: Arial, "Microsoft YaHei", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
}

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

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

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px clamp(20px, 5vw, 64px);
  color: #fff;
  background: linear-gradient(to bottom, rgba(12, 18, 24, .78), rgba(12, 18, 24, 0));
}

.brand-mark {
  position: relative;
  display: inline-flex;
  width: 172px;
  color: #fff;
}

.brand-mark img {
  width: 100%;
  filter: brightness(0) invert(1) drop-shadow(0 2px 5px rgba(0, 0, 0, .42));
}

.registered {
  position: absolute;
  right: -10px;
  top: -7px;
  width: 14px;
  height: 14px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1.4px solid currentColor;
  border-radius: 50%;
  color: currentColor;
  font-size: 8px;
  font-weight: 900;
  line-height: 1;
  text-shadow: 0 2px 5px rgba(0, 0, 0, .42);
}

.site-nav {
  display: flex;
  gap: 24px;
  font-size: 13px;
  font-weight: 700;
}

.site-nav a {
  opacity: .86;
  transition: opacity .18s ease;
}

.site-nav a:hover {
  opacity: 1;
}

.menu-button {
  display: none;
}

.hero {
  min-height: 84vh;
  display: flex;
  align-items: flex-end;
  padding: 120px clamp(20px, 5vw, 64px) 76px;
  color: #fff;
  background-image: linear-gradient(90deg, rgba(9, 16, 22, .76), rgba(9, 16, 22, .28)), url("assets/factory-hero.jpg");
  background-size: cover;
  background-position: center;
}

.hero-content {
  max-width: 760px;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--accent);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.hero .eyebrow {
  color: rgba(255, 255, 255, .78);
}

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

h1 {
  margin-bottom: 18px;
  font-size: clamp(38px, 6vw, 76px);
  line-height: 1.02;
  letter-spacing: 0;
}

h2 {
  margin-bottom: 14px;
  font-size: clamp(28px, 4vw, 48px);
  line-height: 1.08;
  letter-spacing: 0;
}

h3 {
  margin-bottom: 8px;
  font-size: 20px;
  line-height: 1.2;
}

.hero-copy {
  max-width: 620px;
  color: rgba(255, 255, 255, .84);
  font-size: 18px;
  line-height: 1.7;
}

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

.button {
  display: inline-flex;
  align-items: center;
  min-height: 46px;
  padding: 0 18px;
  border-radius: 6px;
  font-weight: 800;
}

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

.button.secondary {
  border: 1px solid rgba(255, 255, 255, .44);
  color: #fff;
}

.proof-strip {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  max-width: 1120px;
  margin: -38px auto 0;
  padding: 0 20px;
}

.proof-strip article {
  min-height: 104px;
  padding: 20px;
  background: var(--panel);
  box-shadow: var(--shadow);
}

.proof-strip strong {
  display: block;
  margin-bottom: 4px;
  font-size: 23px;
}

.proof-strip span {
  color: var(--muted);
  font-size: 13px;
  line-height: 1.45;
}

.section {
  max-width: 1120px;
  margin: 0 auto;
  padding: 88px 20px;
}

.section-heading {
  max-width: 720px;
  margin-bottom: 30px;
}

.section-heading p,
.text-panel p,
.contact-section p {
  color: var(--muted);
  line-height: 1.7;
}

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

.product-card {
  min-height: 190px;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  transition: transform .18s ease, box-shadow .18s ease;
}

.product-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow);
}

.product-card p {
  margin-bottom: 0;
  color: var(--muted);
  line-height: 1.6;
}

.factory-section,
.audit-section {
  display: grid;
  grid-template-columns: 1.05fr .95fr;
  gap: 42px;
  align-items: center;
}

.audit-section {
  grid-template-columns: .95fr 1.05fr;
}

.image-panel {
  overflow: hidden;
  border-radius: 8px;
  background: #d9ddd8;
  box-shadow: var(--shadow);
}

.image-panel img {
  width: 100%;
  height: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.audit-image img {
  object-position: top center;
}

.feature-list {
  display: grid;
  gap: 10px;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
}

.feature-list li {
  padding: 12px 14px;
  border-left: 3px solid var(--accent);
  background: rgba(255, 255, 255, .65);
  color: #39434c;
}

.text-link {
  display: inline-flex;
  margin-top: 22px;
  color: var(--accent);
  font-weight: 800;
  border-bottom: 2px solid var(--accent);
}

.contact-section {
  max-width: 960px;
  margin: 0 auto 72px;
  padding: 64px 24px;
  text-align: center;
  color: #fff;
  background: var(--ink);
  border-radius: 8px;
}

.contact-section .eyebrow {
  color: #9dd2bd;
}

.contact-section h2 {
  margin-bottom: 12px;
}

.contact-email {
  display: inline-flex;
  margin: 8px 0 14px;
  font-size: clamp(22px, 4vw, 38px);
  font-weight: 900;
  overflow-wrap: anywhere;
}

.contact-person {
  color: rgba(255, 255, 255, .72) !important;
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  padding: 24px clamp(20px, 5vw, 64px);
  color: var(--muted);
  border-top: 1px solid var(--line);
}

@media (max-width: 980px) {
  .product-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 860px) {
  .site-header {
    background: rgba(12, 18, 24, .9);
  }

  .brand-mark {
    width: 152px;
  }

  .menu-button {
    display: inline-flex;
    align-items: center;
    min-height: 38px;
    padding: 0 12px;
    border: 1px solid rgba(255, 255, 255, .35);
    border-radius: 6px;
    background: transparent;
    color: #fff;
    font: inherit;
    font-weight: 800;
  }

  .site-nav {
    position: absolute;
    top: 64px;
    left: 20px;
    right: 20px;
    display: none;
    flex-direction: column;
    gap: 0;
    padding: 12px;
    border-radius: 8px;
    background: rgba(12, 18, 24, .96);
  }

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

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

  .hero {
    min-height: 760px;
    padding-bottom: 56px;
  }

  .proof-strip,
  .factory-section,
  .audit-section {
    grid-template-columns: 1fr;
  }

  .proof-strip {
    margin-top: 0;
    padding-top: 20px;
  }

  .section {
    padding: 64px 20px;
  }

  .audit-section .text-panel {
    order: 2;
  }

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

@media (max-width: 620px) {
  .hero {
    min-height: 700px;
  }

  .proof-strip,
  .product-grid {
    grid-template-columns: 1fr;
  }

  .proof-strip article {
    min-height: auto;
  }

  .product-card {
    min-height: auto;
  }
}