* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Microsoft YaHei", Arial, sans-serif;
  background: #f6f6f6;
  color: #333;
}

a {
  text-decoration: none;
  color: inherit;
  transition: all 0.3s ease;
}

ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.topbar {
  background: linear-gradient(to bottom, #ffffff, #f8fbff);
  border-bottom: 1px solid #dfe7f1;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.04);
  position: sticky;
  top: 0;
  z-index: 1000;
}

.container {
  width: 100%;
  padding: 0 30px;
  margin: 0;
}

.nav {
  min-height: 110px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: 16px;
}

.logo-img {
  height: 86px;
  width: auto;
  display: block;
  position: relative;
  top: 8px;
}

.logo-text {
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.logo-cn {
  font-size: 30px;
  font-weight: bold;
  color: #0b5bab;
  line-height: 1.1;
  margin: 0;
}

.logo-en {
  font-size: 13px;
  letter-spacing: 3px;
  color: #6c86aa;
  margin-top: 6px;
  line-height: 1;
}

.menu {
  display: flex;
  align-items: center;
  gap: 18px;
}

.menu a {
  position: relative;
  padding: 10px 16px;
  font-size: 16px;
  font-weight: 500;
  color: #1f2d3d;
  border-radius: 6px;
}

.menu a:hover {
  color: #0b5bab;
  background: rgba(11, 91, 171, 0.08);
}

.menu a.active {
  color: #0b5bab;
  background: rgba(11, 91, 171, 0.10);
}

.menu a.active::after,
.menu a:hover::after {
  content: "";
  position: absolute;
  left: 16px;
  right: 16px;
  bottom: 4px;
  height: 2px;
  background: #0b5bab;
  border-radius: 2px;
}

.service {
  text-align: right;
  padding: 10px 0;
}

.service small {
  display: block;
  color: #888;
  font-size: 12px;
  margin-bottom: 4px;
}

.service strong {
  font-size: 18px;
  color: #222;
}

.page {
  padding: 34px 0 60px;
}

.intro-box {
  margin-bottom: 25px;
}

.intro-title {
  font-size: 22px;
  font-weight: bold;
  color: #0b5bab;
  margin-bottom: 10px;
}

.intro {
  background: #f4f7fb;
  border: 1px solid #e3e8ef;
  border-left: 4px solid #0b5bab;
  padding: 16px 20px;
  border-radius: 6px;
  line-height: 1.8;
  color: #444;
  font-size: 15px;
}

.layout {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 60px;
  align-items: start;
}

.sidebar {
  background: #fff;
  border: 1px solid #e3e8ef;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.05);
}

.side-title {
  padding: 18px 22px;
  font-weight: bold;
  font-size: 20px;
  background: linear-gradient(135deg, #0b5bab, #1b6fd0);
  color: #fff;
  letter-spacing: 1px;
}

.side-group + .side-group {
  border-top: 1px solid #e9eef5;
}

.group-title {
  padding: 14px 22px;
  font-size: 15px;
  font-weight: bold;
  color: #0b5bab;
  background: linear-gradient(to right, #eef5fd, #f8fbff);
  border-left: 3px solid #0b5bab;
  border-bottom: 1px solid #eef2f6;
}

.side-list {
  padding: 8px 0;
}

.side-list li {
  border-bottom: 1px solid #eef2f6;
}

.side-list li:last-child {
  border-bottom: none;
}

.side-list a {
  display: block;
  position: relative;
  padding: 16px 22px 16px 48px;
  font-size: 16px;
  color: #334;
  background: #fff;
}

.side-list a::before {
  content: "";
  position: absolute;
  left: 22px;
  top: 50%;
  width: 8px;
  height: 8px;
  background: #b8c6d8;
  border-radius: 50%;
  transform: translateY(-50%);
  transition: all 0.3s ease;
}

.side-list a:hover {
  background: #f4f8fd;
  color: #0b5bab;
  padding-left: 54px;
}

.side-list a:hover::before {
  background: #0b5bab;
  transform: translateY(-50%) scale(1.2);
}

.side-list a.active {
  background: linear-gradient(to right, #eef5fd, #f8fbff);
  color: #0b5bab;
  font-weight: bold;
}

.side-list a.active::before {
  background: #0b5bab;
  box-shadow: 0 0 0 4px rgba(11, 91, 171, 0.12);
}

.content {
  background: transparent;
  min-width: 0;
}

.product-card {
  display: grid;
  grid-template-columns: 500px 1fr;
  gap: 60px;
  padding: 30px 0;
  border-bottom: 1px solid #e5e5e5;
}

.product-image {
  height: 320px;
  background: #e9edf2;
  border: 1px solid #ddd;
  border-radius: 10px;
  overflow: hidden;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.04);
}

.product-image img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
  background: #eef2f6;
}

.product-info {
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.product-info h2 {
  margin: 0 0 18px;
  font-size: 56px;
  font-weight: 700;
  color: #223;
  line-height: 1.1;
}

.product-info p {
  color: #666;
  line-height: 1.9;
  font-size: 22px;
  margin: 0;
}

.quote-btn {
  display: inline-block;
  width: fit-content;
  margin-top: 24px;
  padding: 12px 28px;
  background: #0b5bab;
  color: #fff;
  border-radius: 8px;
  font-size: 16px;
  font-weight: 500;
}

.quote-btn:hover {
  background: #094a8f;
  transform: translateY(-1px);
}

@media (max-width: 1200px) {
  .container {
    padding: 0 20px;
  }

  .nav {
    flex-wrap: wrap;
    gap: 20px;
    padding: 16px 0;
  }

  .layout {
    grid-template-columns: 1fr;
    gap: 30px;
  }

  .product-card {
    grid-template-columns: 1fr;
    gap: 30px;
  }

  .product-image {
    height: 320px;
  }
}

@media (max-width: 768px) {
  .container {
    padding: 0 16px;
  }

  .menu {
    flex-wrap: wrap;
    gap: 8px;
  }

  .logo-img {
    height: 68px;
  }

  .logo-cn {
    font-size: 24px;
  }

  .logo-en {
    font-size: 12px;
    letter-spacing: 2px;
  }

  .layout {
    gap: 20px;
  }

  .sidebar {
    border-radius: 10px;
  }

  .product-image {
    height: 240px;
  }

  .product-info h2 {
    font-size: 38px;
  }

  .product-info p {
    font-size: 18px;
  }

  .quote-btn {
    font-size: 15px;
    padding: 10px 22px;
  }
} ·