/* 基础样式 */
body {
  margin: 0;
  font-family: 'Microsoft YaHei', Arial, sans-serif;
  background: #f7f9fb;
  color: #222;
}
a { color: inherit; text-decoration: none; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
h1, h2, h3, h4 { margin: 0 0 10px 0; }
h1 { 
  font-size: 3.5rem; 
  color: #222;
  text-align: center;
  font-weight: bold;
  line-height: 1.2;
  margin-bottom: 30px;
}
h2 { 
  font-size: 2.2rem; 
  color: #222; 
  text-align: center; 
  margin: 0 0 18px 0;
  line-height: 1.2;
}
h2:last-of-type {
  margin-bottom: 40px;
}
h3 { 
  font-size: 2rem; 
  color: #1a3fa6; 
  text-align: center; 
  margin: 40px 0 30px;
}
.btn-primary {
  display: inline-block;
  background: #1a3fa6;
  color: #fff;
  padding: 12px 36px;
  border-radius: 30px;
  font-size: 1.1rem;
  margin-top: 24px;
  transition: background 0.2s;
}
.btn-primary:hover { background: #0d2c7a; }

/* 顶部导航 */
.header {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 0;
  background: none !important;
}
.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  background: none !important;
}
.logo { height: 48px; }
.nav ul { 
  list-style: none; 
  margin: 0; 
  padding: 0; 
  display: flex; 
  background: none;
}
.nav ul li { 
  position: relative; 
  background: none;
}
.nav ul li a {
  display: block;
  padding: 0 22px;
  line-height: 72px;
  color: #fff;
  font-size: 1.1rem;
  font-weight: bold;
  transition: color 0.2s;
  background: none;
}
.nav ul li a:hover { color: #1a9fff; }
.mail-link {
  display: flex;
  align-items: center;
  color: #fff;
  font-size: 1rem;
  font-weight: bold;
  background: none !important;
  padding: 8px 18px;
  border-radius: 20px;
  transition: color 0.2s;
}
.mail-link:hover { color: #1a9fff; }
.mail-icon { width: 20px; margin-right: 8px; }

/* 首页主视觉 */
.hero {
  background-size: cover;
  background-position: center;
  color: #fff;
  padding: 120px 0 120px 0;
  text-align: left;
  position: relative;
}
.hero-content h1 {
  font-size: 3.5rem;
  font-weight: bold;
  margin-bottom: 18px;
  line-height: 1.2;
  color: #fff;
  text-align: center;
  width: 100%;
}
.hero-content h2 {
  font-size: 1.8rem;
  font-weight: bold;
  margin-bottom: 18px;
  line-height: 1.4;
  color: #fff;
  text-align: left;
}
.hero-content p {
  font-size: 1.3rem;
  margin-bottom: 18px;
  color: #fff;
  text-align: left;
}
.hero-content p.large-text {
  font-size: 3.5rem;
  line-height: 1.2;
  font-weight: bold;
  text-align: center;
}
.hero-content p:last-of-type {
  margin-top: 36px;
}
.hero-content p strong {
  font-weight: bold;
}

/* 产品介绍 */
.products { background: #fff; padding: 60px 0 40px 0; }
.product-list {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  justify-content: center;
  max-width: 1024px;
  margin: 0 auto;
}
.product-card {
  background: #f7f9fb;
  border-radius: 16px;
  box-shadow: 0 2px 12px rgba(26,63,166,0.06);
  width: 280px;
  padding: 32px 18px 24px 18px;
  text-align: center;
  transition: transform 0.2s, box-shadow 0.2s;
}
.product-card:nth-child(1),
.product-card:nth-child(2) {
  margin-bottom: 32px;
}
.product-card img { width: 56px; height: 56px; margin-bottom: 16px; }
.product-card h3 { color: #1a3fa6; font-size: 1.2rem; margin-bottom: 10px; }
.product-card p { font-size: 0.98rem; color: #444; }
.product-card:hover {
  transform: translateY(-8px) scale(1.04);
  box-shadow: 0 8px 32px rgba(26,63,166,0.12);
}

/* 技术优势 */
.tech-advantage {
  background-size: cover;
  background-position: center;
  color: #fff;
  padding: 60px 0 50px 0;
}
.advantage-list {
  display: grid;
  grid-template-columns: 1fr 1.9fr 1fr;
  gap: 40px;
  justify-content: center;
  margin-top: 120px;
  max-width: 1200px;
  margin: 120px auto 0;
  margin-left: -1%;
  position: relative;
}
.advantage-item {
  width: 100%;
  min-height: 120px;
  text-align: left;
  color: #fff;
  transition: transform 0.2s;
}
.advantage-item:nth-child(odd) {
  text-align: right;
  grid-column: 1;
}
.advantage-item:nth-child(even) {
  text-align: left;
  grid-column: 3;
}
.advantage-item h4 { color: #fff; font-size: 1.1rem; margin-bottom: 8px; }
.advantage-item p { font-size: 0.98rem; }

/* 行业解决方案 */
.solutions { background: #fff; padding: 60px 0 40px 0; }
.solution-list {
  display: flex;
  flex-wrap: wrap;
  gap: 32px;
  justify-content: center;
}
.solution-card {
  background-size: cover;
  background-position: center;
  border-radius: 16px;
  width: 220px;
  height: 180px;
  color: #fff;
  padding: 24px 18px;
  box-shadow: 0 2px 12px rgba(26,63,166,0.10);
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  transition: transform 0.2s, box-shadow 0.2s;
  position: relative;
  overflow: hidden;
}
.solution-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg,rgba(26,63,166,0.10) 40%,rgba(26,63,166,0.60) 100%);
  z-index: 1;
}
.solution-card h3, .solution-card p {
  position: relative;
  z-index: 2;
}
.solution-card h2, .solution-card p {
  font-size: 2rem;
  font-weight: bold;
  margin-bottom: 18px;
  line-height: 1.2;
  color: #fff;
  text-align: left;
  width: 100%;
}
.solution-card h3 { font-size: 1.15rem; margin-bottom: 8px; }
.solution-card p { font-size: 0.98rem; }
.solution-card:hover {
  transform: translateY(-8px) scale(1.04);
  box-shadow: 0 8px 32px rgba(26,63,166,0.16);
}

/* 行业与专项解决方案自定义布局 */
.solution-flex {
  display: flex;
  gap: 32px;
  justify-content: center;
  align-items: stretch;
}
.solution-left {
  flex: 1;
  display: flex;
}
.solution-card-large {
  height: 440px;
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
}
.solution-right {
  flex: 2;
  display: flex;
  flex-direction: column;
  gap: 32px;
}
.solution-row {
  display: flex;
  gap: 32px;
}
.solution-row .solution-card {
  flex: 1;
  height: 180px;
}
@media (max-width: 900px) {
  .solution-flex { flex-direction: column; gap: 20px; }
  .solution-left, .solution-right { width: 100%; }
  .solution-card-large { width: 100%; min-width: 0; height: 180px; }
  .solution-row { flex-direction: column; gap: 20px; }
  .solution-row .solution-card { height: 120px; }
}

/* 页脚 */
.footer {
  background: #181c4a url('../image/top3.png') center top/cover no-repeat;
  color: #fff;
  padding: 40px 0 52px 0;
}
.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}
.footer-logo img { height: 48px; width: auto; }
.footer-logo p { margin: 10px 0 0 0; font-size: 1.1rem; }
.footer-links {
  display: flex;
  gap: 60px;
}
.footer-links div { display: flex; flex-direction: column; }
.footer-links h4 { font-size: 1rem; margin-bottom: 8px; color: #1a9fff; }
.footer-links a { color: #fff; font-size: 0.98rem; margin-bottom: 6px; }
.footer-links a:hover { color: #1a9fff; }
.footer-contact {
  display: flex;
  align-items: center;
  margin-top: 10px;
}
.footer-contact img { width: 22px; margin-right: 8px; }
.footer-bottom {
  text-align: center;
  color: #aaa;
  font-size: 0.95rem;
  padding: 16px 0;
  margin-top: 30px;
}

/* 响应式 */
@media (max-width: 900px) {
  .product-list, .advantage-list, .solution-list { flex-direction: column; align-items: center; }
  .footer-content { flex-direction: column; align-items: flex-start; gap: 30px; }
  .footer-links { gap: 30px; }
}