:root {
  --bg: #f6f3ee;
  --bg-accent: #efe7dc;
  --ink: #1c1b18;
  --muted: #5c5852;
  --brand: #1f6f5f;
  --brand-2: #c47d2a;
  --card: #ffffff;
  --border: #e1d7c9;
  --shadow: 0 16px 40px rgba(0, 0, 0, 0.08);
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.6;
}

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

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

.container {
  width: min(1100px, 92vw);
  margin: 0 auto;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(246, 243, 238, 0.88);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 0;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 700;
  letter-spacing: 0.5px;
}

.logo img {
  width: 44px;
  height: 44px;
}

.nav-links {
  display: flex;
  gap: 18px;
  font-size: 15px;
  color: var(--muted);
}

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

.hero {
  padding: 72px 0 56px;
  background: linear-gradient(140deg, var(--bg) 0%, var(--bg-accent) 100%);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 40px;
  align-items: center;
}

.hero h1 {
  font-family: "Noto Serif SC", "Songti SC", "STSong", serif;
  font-size: clamp(30px, 4vw, 44px);
  margin: 0 0 16px;
}

.hero p {
  color: var(--muted);
  margin: 0 0 26px;
}

.badges {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.badge {
  background: var(--card);
  border: 1px solid var(--border);
  padding: 6px 12px;
  border-radius: 999px;
  font-size: 13px;
}

.hero-card {
  background: var(--card);
  border: 1px solid var(--border);
  padding: 22px;
  border-radius: 18px;
  box-shadow: var(--shadow);
}

.hero-card h3 {
  margin: 0 0 12px;
  font-size: 18px;
}

.section {
  padding: 64px 0;
}

.section-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 26px;
}

.section-title h2 {
  font-family: "Noto Serif SC", "Songti SC", "STSong", serif;
  margin: 0;
  font-size: clamp(22px, 3vw, 30px);
}

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

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

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 18px;
  box-shadow: 0 10px 22px rgba(0, 0, 0, 0.05);
}

.card h3 {
  margin: 12px 0 8px;
  font-size: 18px;
}

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

.cert-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 26px;
  align-items: center;
}

.cert-list {
  display: grid;
  gap: 14px;
}

.cert-item {
  border-left: 4px solid var(--brand);
  padding: 10px 14px;
  background: var(--card);
  border-radius: 12px;
  border: 1px solid var(--border);
}

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

.product-img {
  border-radius: 12px;
  border: 1px solid var(--border);
  overflow: hidden;
  margin-bottom: 12px;
}

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

.case {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 18px;
  align-items: center;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 16px;
}

.case img {
  border-radius: 10px;
  border: 1px solid var(--border);
}

.contact {
  background: var(--ink);
  color: #fff;
  border-radius: 18px;
  padding: 28px;
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 20px;
  align-items: center;
}

.contact h3 {
  margin: 0 0 8px;
  font-size: 22px;
}

.contact p {
  margin: 0;
  color: rgba(255, 255, 255, 0.8);
}

.contact-info {
  background: rgba(255, 255, 255, 0.1);
  padding: 16px;
  border-radius: 12px;
}

.footer {
  padding: 28px 0 40px;
  color: var(--muted);
  font-size: 13px;
}

@media (max-width: 900px) {
  .hero-grid,
  .cert-grid,
  .contact {
    grid-template-columns: 1fr;
  }

  .card-grid,
  .products {
    grid-template-columns: 1fr 1fr;
  }

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

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

@media (max-width: 600px) {
  .nav {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }

  .nav-links {
    flex-wrap: wrap;
  }

  .card-grid,
  .products {
    grid-template-columns: 1fr;
  }
}