/* ========== 全局重置 ========== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
}
body {
  font-family: "Microsoft YaHei", "PingFang SC", "Helvetica Neue", Arial, sans-serif;
  color: #333;
  line-height: 1.6;
  background: #fff;
}
a {
  text-decoration: none;
  color: inherit;
  transition: color 0.3s;
}
ul, ol {
  list-style: none;
}
img {
  max-width: 100%;
  display: block;
}
.container {
  width: 1200px;
  max-width: 100%;
  margin: 0 auto;
  padding: 0 15px;
}

/* ========== 顶部信息栏 ========== */
.top-bar {
  background: #1a3a6b;
  color: #fff;
  font-size: 13px;
  height: 40px;
  line-height: 40px;
}
.top-bar .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.top-bar a {
  color: #ccd6e8;
  margin-left: 20px;
  transition: color 0.3s;
}
.top-bar a:hover {
  color: #fff;
}
.top-bar .top-left span {
  margin-right: 25px;
}
.top-bar .top-left span i,
.top-bar .top-left i {
  margin-right: 6px;
}

/* ========== 头部 / 导航 ========== */
.header {
  background: #fff;
  box-shadow: 0 2px 8px rgba(0,0,0,0.08);
  position: sticky;
  top: 0;
  z-index: 1000;
}
.header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 80px;
}
.logo {
  display: flex;
  align-items: center;
}
.logo-text {
  font-size: 22px;
  font-weight: 700;
  color: #1a3a6b;
  letter-spacing: 1px;
}
.logo-text span {
  color: #e84c3d;
}
.logo-sub {
  font-size: 12px;
  color: #888;
  margin-top: 2px;
}

/* 导航 */
.nav {
  display: flex;
  align-items: center;
}
.nav > li {
  position: relative;
  margin-left: 5px;
}
.nav > li > a {
  display: block;
  padding: 0 20px;
  height: 80px;
  line-height: 80px;
  font-size: 15px;
  color: #333;
  font-weight: 500;
  transition: color 0.3s, background 0.3s;
}
.nav > li > a:hover,
.nav > li.active > a {
  color: #1a3a6b;
  background: #f0f4fa;
}
.nav > li > a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 3px;
  background: #1a3a6b;
  transition: width 0.3s;
}
.nav > li > a:hover::after,
.nav > li.active > a::after {
  width: 60%;
}

/* 下拉菜单 */
.dropdown {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 220px;
  background: #fff;
  box-shadow: 0 6px 20px rgba(0,0,0,0.12);
  border-top: 3px solid #1a3a6b;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: all 0.3s;
  z-index: 100;
}
.nav > li:hover .dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.dropdown li a {
  display: block;
  padding: 12px 20px;
  font-size: 14px;
  color: #555;
  border-bottom: 1px solid #f0f0f0;
  transition: all 0.3s;
}
.dropdown li a:hover {
  background: #f0f4fa;
  color: #1a3a6b;
  padding-left: 25px;
}

/* 移动端菜单按钮 */
.mobile-toggle {
  display: none;
  font-size: 22px;
  cursor: pointer;
  color: #1a3a6b;
  background: none;
  border: none;
}

/* ========== Banner ========== */
.banner {
  position: relative;
  overflow: hidden;
  height: 500px;
  background: linear-gradient(135deg, #1a3a6b 0%, #2d5aa0 50%, #1a3a6b 100%);
}
.banner-slide {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 1s ease;
}
.banner-slide.active {
  opacity: 1;
}
.banner-content {
  text-align: center;
  color: #fff;
  z-index: 2;
}
.banner-content h2 {
  font-size: 42px;
  font-weight: 700;
  margin-bottom: 15px;
  letter-spacing: 3px;
  text-shadow: 0 2px 10px rgba(0,0,0,0.3);
}
.banner-content p {
  font-size: 18px;
  opacity: 0.9;
  margin-bottom: 30px;
  letter-spacing: 1px;
}
.banner-content .btn-banner {
  display: inline-block;
  padding: 12px 40px;
  background: #e84c3d;
  color: #fff;
  border-radius: 30px;
  font-size: 16px;
  font-weight: 500;
  transition: all 0.3s;
  box-shadow: 0 4px 15px rgba(232,76,61,0.4);
}
.banner-content .btn-banner:hover {
  background: #d43c2e;
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(232,76,61,0.5);
}
/* Banner 装饰粒子 */
.banner::before,
.banner::after {
  content: '';
  position: absolute;
  border-radius: 50%;
  background: rgba(255,255,255,0.05);
}
.banner::before {
  width: 400px;
  height: 400px;
  top: -100px;
  right: -100px;
}
.banner::after {
  width: 300px;
  height: 300px;
  bottom: -80px;
  left: -80px;
}
/* Banner 指示器 */
.banner-dots {
  position: absolute;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 10px;
  z-index: 10;
}
.banner-dots span {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: rgba(255,255,255,0.4);
  cursor: pointer;
  transition: all 0.3s;
}
.banner-dots span.active {
  background: #fff;
  transform: scale(1.2);
}

/* ========== 通用区块标题 ========== */
.section {
  padding: 70px 0;
}
.section-title {
  text-align: center;
  margin-bottom: 50px;
}
.section-title h3 {
  font-size: 30px;
  color: #1a3a6b;
  font-weight: 700;
  position: relative;
  display: inline-block;
  padding-bottom: 15px;
}
.section-title h3::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 3px;
  background: #e84c3d;
}
.section-title p {
  color: #888;
  font-size: 15px;
  margin-top: 12px;
}

/* ========== 业务范围卡片 ========== */
.business-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 25px;
}
.business-card {
  background: #fff;
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 4px 15px rgba(0,0,0,0.08);
  transition: all 0.3s;
  cursor: pointer;
}
.business-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 12px 30px rgba(0,0,0,0.15);
}
.business-card-icon {
  height: 160px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 50px;
  color: #fff;
}
.business-card:nth-child(1) .business-card-icon { background: linear-gradient(135deg, #667eea, #764ba2); }
.business-card:nth-child(2) .business-card-icon { background: linear-gradient(135deg, #f093fb, #f5576c); }
.business-card:nth-child(3) .business-card-icon { background: linear-gradient(135deg, #4facfe, #00f2fe); }
.business-card:nth-child(4) .business-card-icon { background: linear-gradient(135deg, #43e97b, #38f9d7); }
.business-card:nth-child(5) .business-card-icon { background: linear-gradient(135deg, #fa709a, #fee140); }
.business-card:nth-child(6) .business-card-icon { background: linear-gradient(135deg, #a18cd1, #fbc2eb); }
.business-card-body {
  padding: 20px;
}
.business-card-body h4 {
  font-size: 17px;
  color: #1a3a6b;
  margin-bottom: 8px;
  font-weight: 600;
}
.business-card-body p {
  font-size: 13px;
  color: #888;
  line-height: 1.8;
}

/* ========== 业务范围图片文字列表 ========== */
.biz-list { display: flex; flex-direction: column; gap: 20px; }
.biz-list-item {
  display: flex;
  align-items: center;
  background: #fff;
  border-radius: 10px;
  overflow: hidden;
  box-shadow: 0 4px 15px rgba(0,0,0,0.07);
  transition: all 0.3s;
  cursor: pointer;
}
.biz-list-item:hover {
  transform: translateX(8px);
  box-shadow: 0 8px 25px rgba(0,0,0,0.13);
}
.biz-list-img {
  flex: 0 0 220px;
  height: 150px;
  overflow: hidden;
}
.biz-list-img svg { width: 100%; height: 100%; }
.biz-list-text {
  flex: 1;
  padding: 20px 30px;
}
.biz-list-text h4 {
  font-size: 18px;
  color: #1a3a6b;
  margin-bottom: 10px;
  font-weight: 600;
}
.biz-list-text p {
  font-size: 14px;
  color: #666;
  line-height: 1.8;
  margin-bottom: 10px;
}
.biz-list-text .biz-tags { display: flex; flex-wrap: wrap; gap: 8px; }
.biz-list-text .biz-tag {
  padding: 4px 14px;
  background: #eef2f8;
  border-radius: 20px;
  font-size: 12px;
  color: #1a3a6b;
}
.biz-list-arrow {
  flex: 0 0 50px;
  text-align: center;
  font-size: 22px;
  color: #ccc;
  transition: color 0.3s;
}
.biz-list-item:hover .biz-list-arrow { color: #1a3a6b; }

/* ========== 首页横排图标业务 ========== */
.biz-icon-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 20px;
}
.biz-icon-item {
  text-align: center;
  padding: 30px 10px;
  border-radius: 10px;
  background: #fff;
  box-shadow: 0 4px 15px rgba(0,0,0,0.06);
  transition: all 0.3s;
}
.biz-icon-item:hover {
  transform: translateY(-8px);
  box-shadow: 0 12px 30px rgba(0,0,0,0.12);
}
.biz-icon-circle {
  width: 70px;
  height: 70px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 30px;
  color: #fff;
  margin: 0 auto 15px;
  box-shadow: 0 6px 18px rgba(0,0,0,0.15);
  transition: transform 0.3s;
}
.biz-icon-item:hover .biz-icon-circle { transform: scale(1.1); }
.biz-icon-item h4 {
  font-size: 15px;
  color: #1a3a6b;
  margin-bottom: 8px;
  font-weight: 600;
}
.biz-icon-item p {
  font-size: 12px;
  color: #888;
  line-height: 1.6;
}

/* ========== 授权资质 ========== */
.honor-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 25px;
}
.honor-card {
  background: #fff;
  border-radius: 10px;
  overflow: hidden;
  box-shadow: 0 4px 15px rgba(0,0,0,0.08);
  transition: all 0.3s;
}
.honor-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 12px 30px rgba(0,0,0,0.15);
}
.honor-card-img {
  height: 240px;
  background: linear-gradient(135deg, #f5f0e8, #e8dcc8);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}
.honor-card-img svg { width: 100%; height: 100%; }
.honor-card-body {
  padding: 18px 20px;
  text-align: center;
}
.honor-card-body h4 {
  font-size: 16px;
  color: #1a3a6b;
  margin-bottom: 5px;
  font-weight: 600;
}
.honor-card-body p {
  font-size: 13px;
  color: #888;
}

/* ========== 关于我们简介区 ========== */
.about-brief {
  background: #f7f9fc;
}
.about-brief-wrap {
  display: flex;
  gap: 50px;
  align-items: center;
}
.about-brief-img {
  flex: 0 0 480px;
  border-radius: 10px;
  overflow: hidden;
  box-shadow: 0 8px 25px rgba(0,0,0,0.1);
}
.about-brief-img img {
  width: 100%;
  height: 320px;
  object-fit: cover;
  background: linear-gradient(135deg, #1a3a6b, #2d5aa0);
}
.about-brief-text {
  flex: 1;
}
.about-brief-text h3 {
  font-size: 26px;
  color: #1a3a6b;
  margin-bottom: 20px;
  font-weight: 700;
}
.about-brief-text p {
  font-size: 15px;
  color: #555;
  line-height: 2;
  margin-bottom: 15px;
}
.about-brief-text .btn-more {
  display: inline-block;
  padding: 10px 30px;
  border: 2px solid #1a3a6b;
  color: #1a3a6b;
  border-radius: 30px;
  font-size: 14px;
  margin-top: 10px;
  transition: all 0.3s;
}
.about-brief-text .btn-more:hover {
  background: #1a3a6b;
  color: #fff;
}

/* ========== 数据统计 ========== */
.stats {
  background: linear-gradient(135deg, #1a3a6b, #2d5aa0);
  padding: 50px 0;
}
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 30px;
  text-align: center;
  color: #fff;
}
.stat-item h4 {
  font-size: 42px;
  font-weight: 700;
  margin-bottom: 8px;
}
.stat-item h4 span {
  font-size: 18px;
  font-weight: 400;
}
.stat-item p {
  font-size: 15px;
  opacity: 0.8;
}

/* ========== 优势/特色 ========== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 25px;
}
.feature-item {
  text-align: center;
  padding: 40px 20px;
  border-radius: 8px;
  background: #fff;
  box-shadow: 0 4px 15px rgba(0,0,0,0.06);
  transition: all 0.3s;
}
.feature-item:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 25px rgba(0,0,0,0.12);
}
.feature-icon {
  width: 70px;
  height: 70px;
  margin: 0 auto 20px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
  color: #fff;
  background: linear-gradient(135deg, #1a3a6b, #2d5aa0);
}
.feature-item h4 {
  font-size: 17px;
  color: #1a3a6b;
  margin-bottom: 10px;
  font-weight: 600;
}
.feature-item p {
  font-size: 13px;
  color: #888;
  line-height: 1.8;
}

/* ========== 新闻/动态 ========== */
.news-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 25px;
}
.news-card {
  background: #fff;
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 4px 15px rgba(0,0,0,0.06);
  transition: all 0.3s;
}
.news-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 25px rgba(0,0,0,0.12);
}
.news-card-img {
  height: 200px;
  overflow: hidden;
}
.news-card-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  background: linear-gradient(135deg, #e8ecf1, #d0d8e4);
  transition: transform 0.5s;
}
.news-card:hover .news-card-img img {
  transform: scale(1.05);
}
.news-card-body {
  padding: 20px;
}
.news-card-body .date {
  font-size: 13px;
  color: #999;
  margin-bottom: 8px;
}
.news-card-body h4 {
  font-size: 16px;
  color: #333;
  font-weight: 600;
  margin-bottom: 10px;
  line-height: 1.5;
}
.news-card-body p {
  font-size: 13px;
  color: #888;
  line-height: 1.8;
}

/* ========== 合作伙伴 ========== */
.partners {
  background: #f7f9fc;
}
.partners-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 20px;
}
.partner-item {
  background: #fff;
  border-radius: 8px;
  padding: 25px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 2px 8px rgba(0,0,0,0.05);
  transition: all 0.3s;
  font-size: 14px;
  color: #888;
  font-weight: 500;
  text-align: center;
  height: 80px;
}
.partner-item:hover {
  box-shadow: 0 6px 18px rgba(0,0,0,0.1);
  transform: translateY(-3px);
  color: #1a3a6b;
}

/* ========== 内页Banner ========== */
.page-banner {
  height: 260px;
  background: linear-gradient(135deg, #1a3a6b 0%, #2d5aa0 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  color: #fff;
  position: relative;
}
.page-banner::after {
  content: '';
  position: absolute;
  inset: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}
.page-banner h2 {
  font-size: 34px;
  font-weight: 700;
  letter-spacing: 2px;
  z-index: 1;
}
.page-banner .breadcrumb {
  margin-top: 12px;
  font-size: 14px;
  opacity: 0.8;
  z-index: 1;
}
.page-banner .breadcrumb a {
  color: #fff;
  opacity: 0.8;
}
.page-banner .breadcrumb a:hover {
  opacity: 1;
}

/* ========== 关于我们 - 详细内容 ========== */
.about-content {
  display: flex;
  gap: 40px;
  align-items: flex-start;
}
.about-sidebar {
  flex: 0 0 250px;
  background: #f7f9fc;
  border-radius: 8px;
  padding: 20px 0;
  position: sticky;
  top: 100px;
}
.about-sidebar li a {
  display: block;
  padding: 14px 25px;
  font-size: 15px;
  color: #555;
  border-left: 3px solid transparent;
  transition: all 0.3s;
}
.about-sidebar li a:hover,
.about-sidebar li.active a {
  background: #fff;
  color: #1a3a6b;
  border-left-color: #1a3a6b;
}
.about-main {
  flex: 1;
}
.about-main h3 {
  font-size: 24px;
  color: #1a3a6b;
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 2px solid #e8ecf1;
}
.about-main p {
  font-size: 15px;
  color: #555;
  line-height: 2;
  margin-bottom: 15px;
  text-indent: 2em;
}

/* ========== 业务详情 ========== */
.business-detail-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 30px;
}
.business-detail-card {
  background: #fff;
  border-radius: 8px;
  padding: 30px;
  box-shadow: 0 4px 15px rgba(0,0,0,0.06);
  border-left: 4px solid #1a3a6b;
  transition: all 0.3s;
}
.business-detail-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 25px rgba(0,0,0,0.12);
}
.business-detail-card h4 {
  font-size: 18px;
  color: #1a3a6b;
  margin-bottom: 12px;
  font-weight: 600;
}
.business-detail-card p {
  font-size: 14px;
  color: #666;
  line-height: 1.9;
}
.business-detail-card ul {
  margin-top: 12px;
}
.business-detail-card ul li {
  font-size: 14px;
  color: #666;
  padding: 5px 0;
  padding-left: 18px;
  position: relative;
}
.business-detail-card ul li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 12px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #1a3a6b;
}

/* ========== 联系我们 ========== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
}
.contact-info-card {
  background: #f7f9fc;
  border-radius: 8px;
  padding: 35px;
}
.contact-info-card h4 {
  font-size: 20px;
  color: #1a3a6b;
  margin-bottom: 25px;
  font-weight: 600;
}
.contact-item {
  display: flex;
  align-items: flex-start;
  margin-bottom: 20px;
}
.contact-item-icon {
  width: 45px;
  height: 45px;
  border-radius: 50%;
  background: linear-gradient(135deg, #1a3a6b, #2d5aa0);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 18px;
  flex-shrink: 0;
  margin-right: 15px;
}
.contact-item-text h5 {
  font-size: 15px;
  color: #333;
  margin-bottom: 4px;
}
.contact-item-text p {
  font-size: 14px;
  color: #888;
}
.contact-form {
  background: #f7f9fc;
  border-radius: 8px;
  padding: 35px;
}
.contact-form h4 {
  font-size: 20px;
  color: #1a3a6b;
  margin-bottom: 25px;
  font-weight: 600;
}
.form-group {
  margin-bottom: 18px;
}
.form-group label {
  display: block;
  font-size: 14px;
  color: #555;
  margin-bottom: 6px;
}
.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 10px 15px;
  border: 1px solid #ddd;
  border-radius: 6px;
  font-size: 14px;
  font-family: inherit;
  transition: border-color 0.3s;
  outline: none;
  background: #fff;
}
.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  border-color: #1a3a6b;
}
.form-group textarea {
  height: 120px;
  resize: vertical;
}
.btn-submit {
  display: inline-block;
  padding: 12px 40px;
  background: #1a3a6b;
  color: #fff;
  border: none;
  border-radius: 6px;
  font-size: 15px;
  cursor: pointer;
  transition: all 0.3s;
}
.btn-submit:hover {
  background: #15305a;
  transform: translateY(-2px);
}
/* 地图区域 */
.map-section {
  background: #f7f9fc;
}
.map-placeholder {
  width: 100%;
  height: 350px;
  border-radius: 8px;
  overflow: hidden;
  background: linear-gradient(135deg, #e8ecf1, #d0d8e4);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #888;
  font-size: 16px;
  box-shadow: 0 4px 15px rgba(0,0,0,0.06);
}

/* ========== 页脚 ========== */
.footer {
  background: #1a2a4a;
  color: #aab4c8;
  padding: 50px 0 0;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1fr .3fr 1fr;
  gap: 140px;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}
.footer h4 {
  color: #fff;
  font-size: 17px;
  margin-bottom: 20px;
  font-weight: 600;
}
.footer p {
  font-size: 14px;
  line-height: 2;
}
.footer-links li {
  margin-bottom: 10px;
}
.footer-links li a {
  font-size: 14px;
  color: #aab4c8;
  transition: color 0.3s;
}
.footer-links li a:hover {
  color: #fff;
}
.footer-contact p {
  margin-bottom: 8px;
}
.footer-contact p i {
  margin-right: 8px;
  width: 16px;
  text-align: center;
}
.footer-bottom {
  text-align: center;
  padding: 20px 0;
  font-size: 13px;
  color: #6a7590;
}

/* ========== 回到顶部 ========== */
.back-to-top {
  position: fixed;
  bottom: 40px;
  right: 30px;
  width: 45px;
  height: 45px;
  background: #1a3a6b;
  color: #fff;
  border: none;
  border-radius: 50%;
  font-size: 18px;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s;
  z-index: 999;
  box-shadow: 0 4px 12px rgba(26,58,107,0.3);
  display: flex;
  align-items: center;
  justify-content: center;
}
.back-to-top.show {
  opacity: 1;
  visibility: visible;
}
.back-to-top:hover {
  background: #e84c3d;
  transform: translateY(-3px);
}

/* ========== 响应式 ========== */
@media (max-width: 1024px) {
  .container { width: 100%; padding: 0 20px; }
  .business-grid { grid-template-columns: repeat(2, 1fr); }
  .biz-icon-grid { grid-template-columns: repeat(3, 1fr); }
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 20px; }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
  .about-brief-wrap { flex-direction: column; }
  .about-brief-img { flex: none; width: 100%; }
  .partners-grid { grid-template-columns: repeat(3, 1fr); }
  .biz-list-img { flex: 0 0 180px; height: 130px; }
  .nav > li > a { padding: 0 12px; font-size: 14px; }
}
@media (max-width: 768px) {
  .top-bar { display: none; }
  .header .container { height: 60px; }
  .logo-text { font-size: 17px; }
  .logo-sub { display: none; }
  .nav {
    display: none;
    position: absolute;
    top: 60px;
    left: 0;
    right: 0;
    background: #fff;
    flex-direction: column;
    box-shadow: 0 6px 20px rgba(0,0,0,0.1);
    max-height: calc(100vh - 60px);
    overflow-y: auto;
  }
  .nav.open { display: flex; }
  .nav > li > a { height: auto; line-height: 1.4; padding: 14px 20px; border-bottom: 1px solid #f0f0f0; }
  .nav > li > a::after { display: none; }
  .dropdown { position: static; opacity: 1; visibility: visible; transform: none; box-shadow: none; border: none; background: #f9fafc; }
  .dropdown li a { padding: 10px 35px; font-size: 13px; }
  .mobile-toggle { display: block; }
  .banner { height: 280px; }
  .banner-content h2 { font-size: 24px; letter-spacing: 1px; }
  .banner-content p { font-size: 13px; padding: 0 15px; }
  .banner-content .btn-banner { padding: 10px 30px; font-size: 14px; }
  .section { padding: 45px 0; }
  .section-title { margin-bottom: 30px; }
  .section-title h3 { font-size: 24px; }
  .business-grid { grid-template-columns: 1fr; }
  .biz-icon-grid { grid-template-columns: repeat(2, 1fr); }
  .features-grid { grid-template-columns: 1fr 1fr; gap: 15px; }
  .feature-item { padding: 25px 15px; }
  .news-grid { grid-template-columns: 1fr; }
  .honor-grid { grid-template-columns: repeat(2, 1fr); gap: 15px; }
  .contact-grid { grid-template-columns: 1fr; }
  .about-content { flex-direction: column; }
  .about-sidebar { flex: none; width: 100%; position: static; }
  .about-sidebar li { display: inline-block; }
  .about-sidebar li a { padding: 10px 15px; border-left: none; border-bottom: 3px solid transparent; }
  .about-sidebar li.active a { border-left-color: transparent; border-bottom-color: #1a3a6b; }
  .business-detail-grid { grid-template-columns: 1fr; }
  .partners-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr; gap: 25px; }
  .page-banner { height: 160px; }
  .page-banner h2 { font-size: 22px; }
  .page-banner .breadcrumb { font-size: 12px; }
  .stat-item h4 { font-size: 28px; }
  .stats { padding: 35px 0; }
  .stats-grid { gap: 15px; }
  .stat-item p { font-size: 13px; }
  .about-brief-text h3 { font-size: 20px; }
  .about-brief-text p { font-size: 14px; }
  /* 业务范围列表手机端 */
  .biz-list-item { flex-wrap: wrap; }
  .biz-list-img { flex: 0 0 100%; height: 140px; }
  .biz-list-text { padding: 15px; }
  .biz-list-text h4 { font-size: 16px; }
  .biz-list-arrow { display: none; }
  .contact-info-card, .contact-form { padding: 20px; }
  .back-to-top { bottom: 20px; right: 15px; width: 40px; height: 40px; font-size: 18px; }
}
@media (max-width: 480px) {
  .features-grid { grid-template-columns: 1fr; }
  .biz-icon-grid { grid-template-columns: repeat(2, 1fr); gap: 12px; }
  .honor-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: 1fr 1fr; }
  .banner { height: 240px; }
  .banner-content h2 { font-size: 20px; }
  .banner-content p { font-size: 12px; }
  .logo-text { font-size: 15px; }
  .partners-grid { grid-template-columns: repeat(2, 1fr); }
}