:root {
  --orange: #f97316;
  --orange-dark: #ea580c;
  --green: #16a34a;
  --dark: #1f2937;
  --gray: #4b5563;
  --light: #f9fafb;
  --white: #ffffff;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: 'Segoe UI', 'Microsoft YaHei', 'PingFang SC', Arial, sans-serif;
  color: var(--dark);
  line-height: 1.6;
  background: var(--white);
}

.container { max-width: 1100px; margin: 0 auto; padding: 0 20px; }

/* Header */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255, 255, 255, 0.96);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}
.nav-wrap { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.brand { display: flex; align-items: center; gap: 8px; font-weight: 700; font-size: 18px; }
.brand-mark { font-size: 24px; }
.nav { display: flex; align-items: center; gap: 22px; }
.nav a { text-decoration: none; color: var(--dark); font-weight: 500; font-size: 15px; }
.nav a:hover { color: var(--orange); }
.lang-select {
  border: 1px solid var(--orange); color: var(--dark); background: #fff;
  padding: 7px 10px; border-radius: 6px; cursor: pointer; font-size: 13px; font-weight: 500;
  max-width: 132px;
}
.lang-select:focus { outline: none; border-color: var(--orange-dark); }
.menu-btn { display: none; background: none; border: none; font-size: 26px; cursor: pointer; color: var(--dark); }

/* Hero */
.hero {
  background: linear-gradient(rgba(0, 0, 0, 0.5), rgba(0, 0, 0, 0.5)), url('images/202410/1.jpg') center/cover no-repeat;
  color: #fff; text-align: center; padding: 130px 20px;
}
.hero h1 { font-size: 46px; line-height: 1.25; margin-bottom: 20px; font-weight: 800; }
.hero-sub { font-size: 20px; opacity: 0.95; margin-bottom: 34px; }
.hero-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.btn { padding: 14px 30px; border-radius: 30px; text-decoration: none; font-weight: 600; font-size: 16px; }
.btn-primary { background: var(--orange); color: #fff; }
.btn-primary:hover { background: var(--orange-dark); }
.btn-ghost { border: 2px solid #fff; color: #fff; }

/* Stats */
.stats { background: var(--orange); color: #fff; }
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; padding: 44px 20px; text-align: center; }
.stat-num { font-size: 38px; font-weight: 800; }
.stat-label { opacity: 0.92; font-size: 15px; }

/* Sections */
.section { padding: 84px 20px; }
.section-alt { background: var(--light); }
.section-title { text-align: center; font-size: 34px; margin-bottom: 16px; font-weight: 800; }
.section-title::after { content: ""; display: block; width: 56px; height: 4px; background: var(--orange); margin: 14px auto 0; border-radius: 2px; }
.lead { text-align: center; max-width: 820px; margin: 0 auto 48px; font-size: 18px; color: var(--gray); }

/* About */
.about-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.about-card { background: #fff; border-radius: 12px; padding: 30px; box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06); }
.about-card h3 { color: var(--orange-dark); margin-bottom: 12px; font-size: 20px; }
.about-card p { color: var(--gray); }

/* Products */
.product-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.product-card { background: #fff; border-radius: 12px; padding: 30px; text-align: center; box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06); }
.product-icon { font-size: 52px; margin-bottom: 12px; }
.product-card h3 { margin-bottom: 12px; font-size: 20px; }
.product-card p { color: var(--gray); }

/* Gallery */
.gallery-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.gallery-grid img { width: 100%; height: 230px; object-fit: cover; border-radius: 12px; box-shadow: 0 2px 10px rgba(0, 0, 0, 0.08); transition: transform 0.2s; }
.gallery-grid img:hover { transform: scale(1.02); }

/* Certifications */
.cert-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; max-width: 840px; margin: 0 auto; }
.cert-item { background: #fff; padding: 18px; border-radius: 10px; border: 1px solid #e5e7eb; text-align: center; font-weight: 500; }
.partners-note { text-align: center; margin-top: 36px; color: var(--gray); font-size: 16px; }

/* Contact */
.contact-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.contact-card { background: #fff; border-radius: 12px; padding: 30px; text-align: center; box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06); text-decoration: none; color: inherit; display: block; }
.contact-icon { font-size: 34px; display: block; margin-bottom: 10px; }
.contact-label { font-weight: 700; display: block; margin-bottom: 4px; }
.contact-value { color: var(--gray); word-break: break-word; }

/* Footer */
.site-footer { background: var(--dark); color: #fff; text-align: center; padding: 26px 20px; font-size: 14px; }

/* Responsive */
@media (max-width: 768px) {
  .nav { display: none; }
  .nav.open { display: flex; flex-direction: column; position: absolute; top: 64px; left: 0; right: 0; background: #fff; padding: 20px; box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1); gap: 16px; }
  .menu-btn { display: block; }
  .hero h1 { font-size: 30px; }
  .hero { padding: 90px 20px; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .about-grid, .product-grid, .cert-grid, .contact-grid, .gallery-grid { grid-template-columns: 1fr; }
}