* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Microsoft YaHei", sans-serif;
  font-size: 16px;
}

html {
  font-size: 10px;
}

body {
  font-size: 1.6rem;
}

svg.icon {
  width: 1em;
  height: 1em;
  fill: currentColor;
  overflow: hidden;
  vertical-align: -0.1em;
}

.txt-min {
  font-size: 1.2rem;
}

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

html {
  scroll-behavior: smooth;
  scroll-behavior: auto;
}

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

body {
  scroll-behavior: smooth;
  scroll-behavior: auto;
}

/* 平滑滚动 */
html {
  scroll-behavior: smooth;
}

/* 容器 */
.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 15px;
}

/* 导航栏 */
header {
  background: #1a2340;
  color: white;
  position: sticky;
  top: 0;
  border-bottom: 1px solid #4d546a;
  z-index: 999;
}

.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 70px;
}

.logo {
  font-size: 22px;
  font-weight: bold;
  color: #fff;
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: 30px;
}

.nav-menu a {
  color: white;
  text-decoration: none;
  font-size: 16px;
}

.nav-menu a:hover {
  color: #4285f4;
}

.nav-tel {
  color: #ffd700;
  font-weight: bold;
  font-size: 16px;
}

/* 横幅：渐变背景 + 大字 */
.banner {
  background: linear-gradient(135deg, #1a2340 0%, #2c3a5f 50%, #3b4b70 100%);
  padding: 70px 0;
  text-align: center;
}

.banner-text {
  color: #fff;
  line-height: 1.9;
}

.banner-text p:nth-child(1) {
  font-size: 28px;
  font-weight: bold;
  margin: 0 0 15px 0;
}

.banner-text p:nth-child(2) {
  font-size: 26px;
  margin: 0 0 15px 0;
}

.banner-text .tel {
  font-size: 30px;
  font-weight: bold;
  color: #ffd700;
  margin: 0;
  display: flex;
  justify-content: center;
  align-items: center;
}

.banner-text .tel .icon {
  font-size: 35px;
  margin-right: 5px;
}

/* 企业介绍：图在右边 */
.about {
  padding: 60px 0;
  background: white;
}

.about-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 30px;
}

.about-content {
  flex: 1;
  font-size: 16px;
  color: #555;
  text-align: left;
  max-width: 600px;
}

.about-img {
  flex: 0 0 580px;
}

.about-img img {
  width: 100%;
  height: auto;
  border-radius: 8px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.title {
  text-align: center;
  font-size: 28px;
  margin-bottom: 30px;
  color: #1a2340;
  position: relative;
}

.title::after {
  content: "";
  width: 60px;
  height: 3px;
  background: #4285f4;
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  bottom: -10px;
}

/* 企业实力 */
.strength {
  padding: 60px 0;
  background: #f9fbfd;
}

.strength-list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 20px;
  margin-top: 30px;
}

.strength-item {
  width: 300px;
  background: white;
  padding: 25px;
  border-radius: 10px;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
  text-align: center;
}

.strength-item h3 {
  font-weight: bold;
  font-size: 1.25rem;
}

/* 产品展示 */
.products {
  padding: 60px 0;
  background: white;
}

.product-box {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 30px;
  margin-top: 40px;
}

.product-item {
  width: 290px;
  border-radius: 10px;
  overflow: hidden;
  box-shadow: 0 3px 10px rgba(0, 0, 0, 0.1);
}


.product-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* 性能特点 */
.features {
  padding: 60px 0;
  background: #1a2340;
  color: white;
}

.features-title {
  text-align: center;
  font-size: 28px;
  margin-bottom: 40px;
}

.feature-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 30px;
}

.feature-item {
  width: 300px;
  text-align: center;
  padding: 20px;
  border: 1px solid #ffffff;
}

.feature-item h3 {
  font-size: 24px;
  font-weight: bold;
  margin-bottom: 10px;
}

.feature-item p {
  margin-bottom: 0;
}

/* 底部 */
footer {
  background: #111827;
  color: #ccc;
  text-align: center;
  padding: 30px 0;
  font-size: 14px;
}

/* 移动端拨号按钮 */
.mobile-tel {
  position: fixed;
  right: 20px;
  bottom: 20px;
  width: 60px;
  height: 60px;
  background: #4285f4;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 24px;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
  z-index: 999;
  display: none;
}

.cases-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 28px;
}

.case-card {
  background: #ffffff;
  border-radius: 24px;
  padding: 24px;
  border: 1px solid #eef2f0;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.02);
}

.case-card i {
  font-size: 2rem;
  color: #1a6d3f;
  margin-bottom: 14px;
}

.case-card h4 {
  font-weight: 600;
  margin-bottom: 8px;
}

.business {
  padding: 35px 0;
  background: #f9fbfd;
}

.city_box {
  padding: 2rem 0;
  background: #1a2340;
  border-top: 1px solid #ffffff;
  border-bottom: 1px solid #ffffff;
}

.city_web {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 1rem;
}

.city_web span a {
  padding: 0.8rem 1.3rem;
  background: #ffffff;
  border-radius: 30px;
  font-size: 14px;
}

/* 移动端适配 */
@media (max-width: 992px) {
  .about-wrap {
    flex-direction: column;
  }

  .about-content {
    text-align: center;
    max-width: 100%;
  }

  .about-img {
    flex: 0 0 100%;
    max-width: 600px;
    margin: 0 auto;
  }
}

@media (max-width: 768px) {
  .mobile-tel {
    display: flex;
  }

  .nav-menu {
    display: none;
  }

  .product-box {
    justify-content: space-between;
    gap: 20px;
  }

  .product-item {
    width: 46%;
  }

  .nav {
    justify-content: space-between;
  }

  .banner-text p:nth-child(1) {
    font-size: 22px;
  }

  .banner-text p:nth-child(2) {
    font-size: 20px;
  }

  .banner-text .tel {
    font-size: 24px;
  }
}