/* ==============================
   全局重置 & 基础通用
============================== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
}
body {
  font-family: "Microsoft Yahei", "PingFang SC", sans-serif;
  background: #f7f9fc;
  color: #333;
  line-height: 1.75;
}
a {
  text-decoration: none;
  color: inherit;
  transition: 0.3s;
}
ul, ol {
  list-style: none;
}
img {
  max-width: 100%;
  display: block;
}
button, input, textarea {
  font-family: inherit;
  border: none;
  outline: none;
}
.container {
  width: 100%;
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 16px;
}

/* ==============================
   按钮通用
============================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 44px;
  padding: 0 24px;
  border-radius: 6px;
  font-size: 15px;
  font-weight: 500;
  cursor: pointer;
}
.btn.primary {
  background: #1677ff;
  color: #fff;
}
.btn.primary:hover {
  background: #0f66d1;
}
.btn.secondary {
  background: #fff;
  color: #1677ff;
  border: 1px solid #1677ff;
}
.btn.secondary:hover {
  background: #f0f7ff;
}

/* ==============================
   头部导航
============================== */
.header {
  position: sticky;
  top: 0;
  z-index: 999;
  background: #fff;
  box-shadow: 0 2px 10px rgba(0,0,0,0.04);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
}
.logo span {
  font-size: 22px;
  font-weight: 700;
  color: #1677ff;
}
.nav-list {
  display: flex;
  gap: 32px;
}
.nav-list a {
  font-size: 15px;
  color: #333;
  position: relative;
}
.nav-list a.active,
.nav-list a:hover {
  color: #1677ff;
}
.nav-list a.active::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -6px;
  width: 100%;
  height: 2px;
  background: #1677ff;
  border-radius: 1px;
}
.mobile-btn {
  display: none;
  font-size: 22px;
  cursor: pointer;
}

/* ==============================
   页面通用标题
============================== */
.page-title {
  padding: 50px 0;
  background: #eef5ff;
  text-align: center;
}
.page-title h1 {
  font-size: 28px;
  color: #222;
  margin-bottom: 6px;
}
.page-title p {
  font-size: 15px;
  color: #666;
}

/* ==============================
   首页 —— Banner
============================== */
.banner {
  height: 460px;
  background: linear-gradient(135deg, #eef5ff 0%, #f7f9fc 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
}
.banner-content h1 {
  font-size: 40px;
  color: #222;
  margin-bottom: 16px;
}
.banner-content p {
  font-size: 17px;
  color: #666;
  max-width: 700px;
  margin: 0 auto 28px;
}

/* ==============================
   首页 —— 优势
============================== */
.advantage {
  padding: 70px 0;
  background: #fff;
}
.section-title {
  font-size: 26px;
  text-align: center;
  margin-bottom: 50px;
  color: #222;
}
.advantage-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.advantage-item {
  padding: 28px;
  background: #fff;
  border-radius: 10px;
  box-shadow: 0 4px 16px rgba(0,0,0,0.04);
  text-align: center;
}
.advantage-item img {
  width: 66px;
  height: 66px;
  margin: 0 auto 16px;
  object-fit: cover;
  border-radius: 50%;
}
.advantage-item h3 {
  font-size: 17px;
  color: #222;
  margin-bottom: 10px;
}
.advantage-item p {
  font-size: 14px;
  color: #666;
}

/* ==============================
   首页 —— 企业简介
============================== */
.intro {
  padding: 70px 0;
  background: #f7f9fc;
}
.intro-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
}
.intro-text h2 {
  font-size: 24px;
  margin-bottom: 16px;
  color: #222;
}
.intro-text p {
  font-size: 15px;
  color: #666;
  margin-bottom: 14px;
}
.intro-img img {
  border-radius: 10px;
  box-shadow: 0 4px 16px rgba(0,0,0,0.06);
}

/* ==============================
   关于我们 —— 时间线
============================== */
.about-content {
  padding: 70px 0;
  background: #fff;
}
.about-text {
  margin-bottom: 50px;
}
.about-text h2 {
  font-size: 22px;
  margin-bottom: 16px;
  color: #222;
}
.about-text p {
  font-size: 15px;
  color: #666;
  margin-bottom: 14px;
}
.timeline h2 {
  font-size: 22px;
  text-align: center;
  margin-bottom: 36px;
  color: #222;
}
.timeline-list {
  position: relative;
  padding-left: 40px;
  max-width: 800px;
  margin: 0 auto;
}
.timeline-list::before {
  content: '';
  position: absolute;
  left: 10px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: #1677ff;
}
.timeline-item {
  position: relative;
  margin-bottom: 32px;
}
.timeline-item .year {
  position: absolute;
  left: -40px;
  top: 0;
  width: 36px;
  height: 36px;
  background: #1677ff;
  color: #fff;
  border-radius: 50%;
  font-size: 13px;
  font-weight: 500;
  display: flex;
  align-items: center;
  justify-content: center;
}
.timeline-item .content {
  background: #f7f9fc;
  padding: 18px 20px;
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.03);
}
.timeline-item .content h3 {
  font-size: 16px;
  color: #222;
  margin-bottom: 6px;
}
.timeline-item .content p {
  font-size: 14px;
  color: #666;
}

/* ==============================
   产品中心 —— 标签切换
============================== */
.product-tabs {
  padding: 70px 0;
  background: #fff;
}
.tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
  margin-bottom: 40px;
}
.tab-btn {
  padding: 10px 22px;
  background: #f7f9fc;
  border: 1px solid #e5e7eb;
  border-radius: 6px;
  font-size: 14px;
  color: #555;
  cursor: pointer;
  transition: 0.3s;
}
.tab-btn.active,
.tab-btn:hover {
  background: #1677ff;
  color: #fff;
  border-color: #1677ff;
}
.tab-content {
  display: none;
}
.tab-content.active {
  display: block;
}
.product-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}
.product-item {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 18px;
  align-items: center;
  background: #f7f9fc;
  padding: 18px;
  border-radius: 8px;
}
.product-item img {
  width: 120px;
  height: 120px;
  object-fit: cover;
  border-radius: 6px;
}
.product-info h3 {
  font-size: 16px;
  color: #222;
  margin-bottom: 6px;
}
.product-info p {
  font-size: 13px;
  color: #666;
  line-height: 1.6;
  margin-bottom: 4px;
}

/* ==============================
   新闻资讯 —— 图文列表
============================== */
.news-content {
  padding: 70px 0;
  background: #fff;
}
.news-list {
  display: flex;
  flex-direction: column;
  gap: 24px;
}
.news-item {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 20px;
  background: #f7f9fc;
  padding: 20px;
  border-radius: 8px;
  align-items: center;
}
.news-img img {
  width: 100%;
  height: 140px;
  object-fit: cover;
  border-radius: 6px;
}
.news-info .date {
  font-size: 13px;
  color: #1677ff;
  margin-bottom: 8px;
  display: inline-block;
}
.news-info h3 {
  font-size: 17px;
  color: #222;
  margin-bottom: 10px;
}
.news-info p {
  font-size: 14px;
  color: #666;
  margin-bottom: 14px;
  line-height: 1.7;
}
.read-more {
  font-size: 13px;
  color: #1677ff;
  padding: 6px 14px;
  border: 1px solid #1677ff;
  border-radius: 4px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.read-more:hover {
  background: #1677ff;
  color: #fff;
}

/* ==============================
   案例展示 —— 大图+卡片
============================== */
.case-banner {
  padding: 40px 0;
  background: #f7f9fc;
}
.case-banner-inner {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 30px;
  align-items: center;
}
.case-banner-inner img {
  border-radius: 10px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.06);
}
.case-banner-info h2 {
  font-size: 22px;
  color: #222;
  margin-bottom: 14px;
}
.case-banner-info p {
  font-size: 15px;
  color: #666;
}
.case-list-section {
  padding: 70px 0;
  background: #fff;
}
.case-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.case-item {
  border-radius: 10px;
  overflow: hidden;
  background: #f7f9fc;
  box-shadow: 0 2px 8px rgba(0,0,0,0.04);
}
.case-item img {
  width: 100%;
  height: 180px;
  object-fit: cover;
}
.case-item h3 {
  font-size: 16px;
  color: #222;
  padding: 14px 16px 6px;
}
.case-item p {
  font-size: 13px;
  color: #666;
  padding: 0 16px 6px;
  line-height: 1.6;
}
.case-tag {
  font-size: 12px;
  color: #999;
  padding: 0 16px 14px;
}

/* ==============================
   联系我们 —— 表单+信息
============================== */
.contact-content {
  padding: 70px 0;
  background: #fff;
}
.contact-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
}
.contact-info h2,
.contact-form h2 {
  font-size: 22px;
  color: #222;
  margin-bottom: 24px;
}
.info-item {
  margin-bottom: 20px;
}
.info-item h3 {
  font-size: 15px;
  color: #222;
  margin-bottom: 6px;
}
.info-item p {
  font-size: 14px;
  color: #666;
}
.info-item .tip {
  font-size: 12px;
  color: #999;
  margin-top: 4px;
}
.form-group {
  margin-bottom: 18px;
}
.form-group label {
  display: block;
  font-size: 14px;
  color: #333;
  margin-bottom: 6px;
}
.form-group input,
.form-group textarea {
  width: 100%;
  height: 44px;
  padding: 0 14px;
  background: #f7f9fc;
  border: 1px solid #e5e7eb;
  border-radius: 6px;
  font-size: 14px;
}
.form-group textarea {
  height: auto;
  padding: 12px 14px;
  resize: vertical;
}

/* ==============================
   底部
============================== */
.footer {
  background: #2a2a2a;
  color: #ccc;
  padding: 40px 0 24px;
  margin-top: 40px;
}
.footer-inner {
  text-align: center;
}
.footer-logo {
  font-size: 18px;
  font-weight: 500;
  color: #fff;
  margin-bottom: 16px;
}
.footer-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 20px;
  margin-bottom: 20px;
  font-size: 14px;
}
.footer-nav a:hover {
  color: #1677ff;
}
.copyright {
  font-size: 13px;
  color: #999;
  border-top: 1px solid #444;
  padding-top: 16px;
}

/* ==============================
   移动端响应式
============================== */
@media (max-width: 768px) {
  .nav-list {
    display: none;
  }
  .mobile-btn {
    display: block;
  }
  .nav-list.show {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 70px;
    left: 0;
    right: 0;
    background: #fff;
    padding: 20px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.06);
  }
  .banner {
    height: 360px;
  }
  .banner-content h1 {
    font-size: 28px;
  }
  .advantage-list,
  .intro-inner,
  .product-list,
  .case-list,
  .contact-inner {
    grid-template-columns: 1fr;
  }
  .news-item {
    grid-template-columns: 120px 1fr;
  }
  .case-banner-inner {
    grid-template-columns: 1fr;
  }
}