* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
:root {
  --primary: #165DFF;
  --secondary: #FF7D00;
  --dark: #1D2129;
  --gray: #4E5969;
  --light: #F2F3F5;
  --white: #fff;
}
body {
  font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--dark);
  line-height: 1.7;
  background: #fff;
}
.container {
  width: 92%;
  max-width: 1200px;
  margin: 0 auto;
}
a {
  text-decoration: none;
  color: inherit;
}
ul {
  list-style: none;
}
img {
  max-width: 100%;
  display: block;
}
.section {
  padding: 80px 0;
}
.sec-title {
  text-align: center;
  margin-bottom: 50px;
}
.sec-title h3 {
  font-size: 14px;
  color: var(--primary);
  letter-spacing: 2px;
  margin-bottom: 8px;
  text-transform: uppercase;
}
.sec-title h2 {
  font-size: 32px;
  font-weight: 600;
  margin-bottom: 12px;
}
.sec-title p {
  color: var(--gray);
  max-width: 650px;
  margin: 0 auto;
}
.sec-title.white h2,
.sec-title.white p {
  color: #fff;
}
.btn {
  display: inline-block;
  padding: 12px 30px;
  border-radius: 4px;
  font-weight: 500;
  transition: 0.3s;
  cursor: pointer;
  border: none;
  font-size: 15px;
}
.btn.primary {
  background: var(--primary);
  color: #fff;
}
.btn.primary:hover {
  background: #0E42B3;
}
.btn.second {
  background: transparent;
  color: var(--primary);
  border: 1px solid var(--primary);
}
.btn.second:hover {
  background: var(--primary);
  color: #fff;
}

/* 导航 */
.header {
  position: fixed;
  top: 0;
  width: 100%;
  background: rgba(29, 33, 41, 0.95);
  z-index: 999;
  backdrop-filter: blur(6px);
}
.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 18px 0;
}
.logo {
  color: #fff;
  font-size: 22px;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 8px;
}
.logo span {
  font-size: 13px;
  color: #ccc;
  font-weight: 400;
  display: block;
}
.menu {
  display: flex;
  gap: 32px;
  color: #fff;
  font-size: 15px;
}
.menu li a:hover {
  color: var(--secondary);
}
.lang {
  color: #ccc;
}
.mobile-btn {
  display: none;
  color: #fff;
  font-size: 20px;
}

/* Banner */
.banner {
  height: 100vh;
  min-height: 650px;
  background: linear-gradient(rgba(0,0,0,0.65), rgba(0,0,0,0.75)), 
    url('https://img1.baidu.com/it/u=2779965222,1235561123&fm=253&fmt=auto&app=138&f=JPEG') center/cover no-repeat;
  display: flex;
  align-items: center;
  color: #fff;
}
.banner-text h2 {
  font-size: 18px;
  color: var(--secondary);
  margin-bottom: 10px;
  letter-spacing: 1px;
}
.banner-text h1 {
  font-size: 46px;
  line-height: 1.3;
  margin-bottom: 16px;
  max-width: 750px;
}
.banner-text p {
  font-size: 16px;
  color: #ddd;
  margin-bottom: 35px;
}
.banner-btns {
  display: flex;
  gap: 15px;
}

/* 关于 */
.about-wrap {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 50px;
  align-items: center;
}
.about-img img {
  border-radius: 8px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}
.about-text p {
  color: var(--gray);
  margin-bottom: 14px;
  font-size: 15px;
}
.about-text strong {
  color: var(--primary);
}

/* 产品 */
.products {
  background: var(--dark);
}
.product-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 25px;
}
.product-item {
  background: rgba(255,255,255,0.05);
  padding: 35px 25px;
  border-radius: 8px;
  text-align: center;
  color: #fff;
  transition: 0.3s;
  border: 1px solid rgba(255,255,255,0.1);
}
.product-item:hover {
  background: rgba(22, 93, 255, 0.1);
  transform: translateY(-6px);
  border-color: var(--primary);
}
.product-item i {
  font-size: 36px;
  color: var(--secondary);
  margin-bottom: 18px;
}
.product-item h4 {
  font-size: 18px;
  margin-bottom: 10px;
}
.product-item p {
  color: #ccc;
  font-size: 14px;
  line-height: 1.6;
}

/* 优势 */
.adv-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 25px;
}
.adv-card {
  background: #fff;
  padding: 35px 25px;
  border-radius: 8px;
  text-align: center;
  box-shadow: 0 6px 20px rgba(0,0,0,0.06);
  transition: 0.3s;
}
.adv-card:hover {
  transform: translateY(-6px);
}
.adv-card i {
  font-size: 34px;
  color: var(--primary);
  margin-bottom: 16px;
}
.adv-card h4 {
  font-size: 17px;
  margin-bottom: 8px;
}
.adv-card p {
  color: var(--gray);
  font-size: 14px;
}

/* 新闻 */
.news {
  background: var(--dark);
}
.news-list {
  max-width: 850px;
  margin: 0 auto;
}
.news-item {
  display: flex;
  background: rgba(255,255,255,0.05);
  margin-bottom: 15px;
  border-radius: 8px;
  overflow: hidden;
}
.news-date {
  background: var(--primary);
  color: #fff;
  width: 90px;
  text-align: center;
  padding: 20px 10px;
  font-weight: 600;
}
.news-date span {
  font-size: 28px;
  display: block;
}
.news-content {
  flex: 1;
  padding: 20px 25px;
  color: #fff;
}
.news-content h4 {
  font-size: 17px;
  margin-bottom: 6px;
}
.news-content p {
  color: #ccc;
  font-size: 14px;
}

/* 联系 */
.contact-wrap {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
}
.contact-info {
  display: flex;
  flex-direction: column;
  gap: 25px;
}
.info-item {
  display: flex;
  align-items: flex-start;
  gap: 15px;
}
.info-item i {
  font-size: 24px;
  color: var(--primary);
  margin-top: 4px;
  min-width: 30px;
}
.info-item h4 {
  font-size: 17px;
  margin-bottom: 4px;
}
.info-item p {
  color: var(--gray);
}
.contact-form {
  background: #fff;
  padding: 35px;
  border-radius: 8px;
  box-shadow: 0 8px 25px rgba(0,0,0,0.08);
}
.contact-form h4 {
  font-size: 20px;
  margin-bottom: 20px;
}
.contact-form input,
.contact-form textarea {
  width: 100%;
  padding: 14px 16px;
  margin-bottom: 15px;
  border: 1px solid #E5E6EB;
  border-radius: 4px;
  font-size: 15px;
  font-family: inherit;
}
.contact-form button {
  width: 100%;
}

/* 底部 */
.footer {
  background: var(--dark);
  color: #C9CDD4;
  padding: 60px 0 20px;
}
.footer-wrap {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 30px;
  margin-bottom: 40px;
}
.foot-col h4 {
  color: #fff;
  font-size: 16px;
  margin-bottom: 20px;
}
.foot-col ul li {
  margin-bottom: 10px;
  font-size: 14px;
}
.foot-col p {
  font-size: 14px;
  line-height: 1.8;
  margin-bottom: 15px;
}
.social {
  display: flex;
  gap: 12px;
  font-size: 20px;
}
.copy {
  border-top: 1px solid #2E3038;
  padding-top: 25px;
  text-align: center;
  font-size: 13px;
  color: #86909C;
}

/* 响应式 */
@media(max-width:992px) {
  .menu {
    display: none;
  }
  .mobile-btn {
    display: block;
  }
  .banner-text h1 {
    font-size: 36px;
  }
  .about-wrap,
  .contact-wrap {
    grid-template-columns: 1fr;
  }
  .product-list {
    grid-template-columns: repeat(2,1fr);
  }
  .adv-grid {
    grid-template-columns: repeat(2,1fr);
  }
  .footer-wrap {
    grid-template-columns: repeat(2,1fr);
  }
}
@media(max-width:768px) {
  .section {
    padding: 60px 0;
  }
  .banner-text h1 {
    font-size: 28px;
  }
  .product-list,
  .adv-grid {
    grid-template-columns: 1fr;
  }
}