:root {
  --primary: #0d9488;
  --primary-light: #14b8a6;
  --primary-dark: #0f766e;
  --bg-light: #f8fafc;
  --text: #1e293b;
  --text-light: #64748b;
  --border: #e2e8f0;
  --white: #ffffff;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--text);
  line-height: 1.8;
  background: var(--white);
}

.container { max-width: 1100px; margin: 0 auto; padding: 0 40px; }

/* 导航栏 */
.navbar {
  background: var(--white);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
}
.navbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 40px;
  height: 72px;
}
.logo { display: flex; align-items: center; gap: 12px; text-decoration: none; color: var(--primary); font-weight: 700; font-size: 20px; }
.logo-img { width: 44px; height: 44px; object-fit: contain; }
.nav-links { display: flex; gap: 36px; }
.nav-links a {
  text-decoration: none;
  color: var(--text-light);
  font-size: 16px;
  transition: color 0.2s;
}
.nav-links a:hover, .nav-links a.active { color: var(--primary); }
.mobile-toggle { display: none; }

/* 页面标题区 */
.page-header {
  background: var(--bg-light);
  padding: 80px 0 64px;
  text-align: center;
}
.page-header .header-logo {
  width: 96px;
  height: 96px;
  object-fit: contain;
  margin-bottom: 28px;
}
.page-header h1 { font-size: 36px; color: var(--text); margin-bottom: 12px; }
.page-header p { color: var(--text-light); font-size: 18px; }

/* 内容区 */
.content { padding: 64px 0; }
.content h2 { font-size: 26px; color: var(--text); margin: 40px 0 20px; }
.content h2:first-child { margin-top: 0; }
.content p { color: var(--text-light); margin-bottom: 16px; font-size: 16px; }

/* 产品卡片 */
.product-card {
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 32px;
  margin-bottom: 24px;
  background: var(--white);
}
.product-card h3 { font-size: 20px; color: var(--primary); margin-bottom: 16px; }
.product-card p { font-size: 15px; color: var(--text-light); margin-bottom: 12px; }
.product-card ul { padding-left: 24px; }
.product-card li { font-size: 15px; color: var(--text-light); margin-bottom: 6px; line-height: 1.9; }

/* 两栏布局 */
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
@media (max-width: 768px) {
  .grid-2 { grid-template-columns: 1fr; }
}

/* 联系信息 */
.contact-item { margin-bottom: 24px; }
.contact-item h3 { font-size: 18px; color: var(--text); margin-bottom: 6px; }
.contact-item p { font-size: 16px; color: var(--text-light); }

/* 页脚 */
.footer {
  background: var(--bg-light);
  border-top: 1px solid var(--border);
  padding: 40px 0;
  text-align: center;
}
.footer p { font-size: 14px; color: var(--text-light); }

/* 响应式 - 仅小屏适配 */
@media (max-width: 768px) {
  .container { padding: 0 20px; }
  .navbar-inner { padding: 0 20px; height: 60px; }
  .logo { font-size: 18px; }
  .logo-img { width: 36px; height: 36px; }
  .nav-links { display: none; }
  .mobile-toggle {
    display: flex;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
  }
  .mobile-toggle span {
    width: 22px; height: 2px;
    background: var(--text);
  }
  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 60px; left: 0; right: 0;
    background: var(--white);
    border-bottom: 1px solid var(--border);
    padding: 16px 20px;
  }
  .page-header { padding: 48px 0 40px; }
  .page-header .header-logo { width: 72px; height: 72px; }
  .page-header h1 { font-size: 26px; }
  .page-header p { font-size: 15px; }
  .content { padding: 40px 0; }
  .product-card { padding: 20px; }
}