:root {
  --primary: #165DFF;
  --secondary: #0d47a1;
  --red: #d32f2f;
  --dark: #1f2937;
  --light: #f9fafb;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", sans-serif;
  color: var(--dark);
  background: var(--light);
  line-height: 1.7;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
.container { max-width: 1120px; margin: 0 auto; padding: 0 16px; }
header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: #fff;
  box-shadow: 0 2px 12px rgba(15, 23, 42, .08);
}
.topbar { display: flex; align-items: center; justify-content: space-between; gap: 20px; padding: 14px 0; }
.brand { font-size: 26px; font-weight: 900; color: var(--secondary); }
.hotline { color: var(--red); font-weight: 800; }
.desktop-nav { display: flex; gap: 28px; font-weight: 700; }
.desktop-nav a:hover { color: var(--red); }
.menu-button { display: none; border: 0; background: transparent; color: var(--dark); font-size: 28px; font-weight: 900; cursor: pointer; }
.mobile-menu { display: none; border-top: 1px solid #e5e7eb; background: #fff; box-shadow: 0 10px 24px rgba(15, 23, 42, .08); }
.mobile-menu-inner { display: flex; flex-direction: column; gap: 10px; padding: 12px 16px 18px; font-weight: 800; }
.mobile-hotline { padding-bottom: 10px; border-bottom: 1px solid #e5e7eb; color: var(--red); }
section { padding: 64px 0; scroll-margin-top: 96px; }
.hero { padding-top: 86px; color: #fff; text-align: center; background: linear-gradient(135deg, var(--primary), var(--secondary)); }
.hero h1 { margin: 0 0 22px; font-size: clamp(34px, 7vw, 58px); line-height: 1.12; text-shadow: 0 2px 4px rgba(0, 0, 0, .3); }
.hero p { max-width: 820px; margin: 0 auto 18px; font-size: 20px; }
.phone-pill { display: inline-block; max-width: 100%; margin: 14px 0 28px; padding: 12px 24px; border-radius: 999px; background: rgba(211, 47, 47, .92); font-size: 22px; font-weight: 900; line-height: 1.45; box-shadow: 0 10px 25px rgba(0, 0, 0, .16); }
.button { display: inline-block; padding: 12px 30px; border-radius: 999px; background: var(--red); color: #fff; font-weight: 900; }
.section-title { text-align: center; margin-bottom: 42px; }
.section-title h2 { margin: 0 0 10px; font-size: 34px; color: var(--dark); }
.section-title .line { width: 80px; height: 4px; margin: 0 auto 16px; background: var(--red); }
.about-grid { display: grid; grid-template-columns: 1.1fr .9fr; gap: 36px; align-items: center; }
.text-block { font-size: 18px; }
.image-panel { overflow: hidden; border-radius: 12px; box-shadow: 0 18px 36px rgba(15, 23, 42, .16); background: #e5e7eb; }
.image-panel div { min-height: 320px; display: grid; place-items: center; padding: 32px; color: #64748b; font-size: 24px; font-weight: 900; }
.image-panel img { width: 100%; height: 360px; object-fit: cover; }
.gray { background: #f3f4f6; }
.product-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 28px; }
.product-card, .adv-card, .contact-card { background: #fff; border-radius: 12px; overflow: hidden; box-shadow: 0 8px 24px rgba(15, 23, 42, .08); }
.product-image { aspect-ratio: 1 / 1; display: grid; place-items: center; background: linear-gradient(135deg, #0f4c81, #38bdf8); color: #fff; font-size: 32px; font-weight: 900; text-align: center; padding: 22px; }
.product-image img { width: 100%; height: 100%; object-fit: cover; }
.product-body { padding: 22px; text-align: center; }
.product-body h3 { margin: 0 0 8px; color: var(--secondary); font-size: 22px; }
.adv-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; margin-top: 38px; }
.adv-card { padding: 24px; text-align: center; }
.adv-card strong { display: block; margin-bottom: 8px; font-size: 20px; }
.future { color: #fff; text-align: center; background: linear-gradient(135deg, var(--primary), var(--secondary)); }
.contact-card { max-width: 720px; margin: 0 auto; padding: 34px; text-align: center; background: #f9fafb; }
footer { padding: 32px 0; color: #fff; text-align: center; background: var(--dark); }
.mobile-call { position: fixed; right: 20px; bottom: 20px; width: 56px; height: 56px; display: none; align-items: center; justify-content: center; border-radius: 999px; background: var(--red); color: #fff; font-weight: 900; box-shadow: 0 12px 28px rgba(0, 0, 0, .2); }

@media (max-width: 860px) {
  .topbar { align-items: center; gap: 12px; padding: 10px 0; }
  .brand { flex: 1; min-width: 0; font-size: clamp(18px, 5vw, 23px); line-height: 1.25; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
  .hotline, .desktop-nav { display: none; }
  .menu-button { display: block; flex: 0 0 auto; }
  .mobile-menu.open { display: block; }
  .about-grid, .product-grid, .adv-grid { grid-template-columns: 1fr; }
  .hero { padding-top: 72px; }
  .hero p { font-size: 18px; }
  .phone-pill { border-radius: 18px; font-size: clamp(16px, 4.6vw, 20px); word-break: break-word; }
  .mobile-call { display: flex; }
}