/* ============================================
   公司官网样式表（架构参考：上海锐开电气）
   主色 #224999 / 辅助 #6fa8dc / 强调 #cc0000
   ============================================ */

:root {
  --primary: #224999;
  --primary-light: #6fa8dc;
  --accent: #cc0000;
  --bg: #ffffff;
  --bg-gray: #f6f6f6;
  --text: #333333;
  --text-light: #777777;
  --border: #e5e5e5;
  --maxw: 1200px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: "Microsoft YaHei", "PingFang SC", "Helvetica Neue", Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
  font-size: 14px;
}

a { text-decoration: none; color: inherit; }
ul, ol { list-style: none; }
img { max-width: 100%; display: block; }

.container { max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }

/* ---------- 顶部信息条 ---------- */
.topbar {
  background: var(--bg-gray);
  border-bottom: 1px solid var(--border);
  font-size: 13px;
  color: var(--text-light);
}
.topbar .container {
  display: flex; justify-content: space-between; align-items: center;
  height: 36px;
}
.topbar-left a { margin-right: 16px; }
.topbar-left a:hover { color: var(--primary); }
.topbar-right a { margin-left: 16px; }
.topbar-right a:hover { color: var(--primary); }

/* ---------- 头部 Logo + 搜索 + 导航 ---------- */
.header {
  background: var(--bg);
  border-bottom: 2px solid var(--primary);
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 88px;
}
.logo { display: flex; align-items: center; gap: 12px; }
.logo-mark {
  width: 48px; height: 48px; border-radius: 6px;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: #fff; display: flex; align-items: center; justify-content: center;
  font-weight: bold; font-size: 18px; letter-spacing: 1px;
}
.logo-text .logo-name { font-size: 22px; font-weight: bold; color: var(--primary); }
.logo-text .logo-sub { font-size: 12px; color: var(--text-light); letter-spacing: 2px; }

.header-right { display: flex; align-items: center; gap: 20px; }
.search-box {
  display: flex; align-items: center; border: 1px solid var(--border);
  border-radius: 20px; overflow: hidden; background: var(--bg-gray);
}
.search-box input {
  border: none; outline: none; background: transparent;
  padding: 6px 12px; width: 180px; font-size: 13px;
}
.search-box button {
  border: none; background: var(--primary); color: #fff;
  padding: 6px 14px; cursor: pointer; font-size: 13px;
}

/* ---------- 主导航 ---------- */
.nav { background: var(--primary); }
.nav-inner { position: relative; }
.nav-list { display: flex; }
.nav-item { position: relative; }
.nav-item > a {
  display: block; color: #fff; padding: 14px 22px; font-size: 15px;
  transition: background .2s;
}
.nav-item > a:hover, .nav-item.active > a { background: #1b3a7a; }
.nav-item .arrow { font-size: 11px; margin-left: 4px; opacity: .7; }

/* 下拉菜单 */
.dropdown {
  position: absolute; left: 0; top: 100%; min-width: 220px;
  background: #fff; box-shadow: 0 6px 20px rgba(0,0,0,.15);
  display: none; z-index: 100; border-top: 3px solid var(--primary-light);
}
.nav-item:hover .dropdown { display: block; }
.dropdown a {
  display: block; padding: 10px 18px; color: var(--text); font-size: 14px;
  border-bottom: 1px solid #f0f0f0;
}
.dropdown a:hover { background: var(--bg-gray); color: var(--primary); padding-left: 24px; }
.dropdown .sub-title {
  font-weight: bold; color: var(--primary); background: var(--bg-gray);
  pointer-events: none;
}

/* ---------- Banner 轮播 ---------- */
.banner { position: relative; overflow: hidden; background: #1a1a1a; }
.banner-track { display: flex; transition: transform .6s ease; }
.banner-slide {
  min-width: 100%; height: 480px; position: relative;
  display: flex; align-items: center; justify-content: center;
}
.banner-slide .ph {
  width: 100%; height: 100%; display: flex; flex-direction: column;
  align-items: center; justify-content: center; color: #fff;
  background: linear-gradient(135deg, #1b3a7a, #224999 40%, #6fa8dc);
}
.banner-slide .ph h2 { font-size: 40px; letter-spacing: 6px; margin-bottom: 12px; }
.banner-slide .ph p { font-size: 16px; opacity: .85; letter-spacing: 2px; }
.banner-dots {
  position: absolute; bottom: 20px; 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,.4);
  cursor: pointer; transition: background .2s;
}
.banner-dots span.active { background: var(--accent); }
.banner-prev, .banner-next {
  position: absolute; top: 50%; transform: translateY(-50%);
  width: 44px; height: 44px; background: rgba(0,0,0,.35); color: #fff;
  border: none; cursor: pointer; font-size: 20px; z-index: 10; border-radius: 50%;
}
.banner-prev { left: 20px; }
.banner-next { right: 20px; }
.banner-prev:hover, .banner-next:hover { background: var(--primary); }

/* ---------- 通用板块 ---------- */
.section { padding: 56px 0; }
.section-gray { background: var(--bg-gray); }
.section-head { text-align: center; margin-bottom: 36px; }
.section-head .en { color: var(--primary-light); font-size: 13px; letter-spacing: 3px; text-transform: uppercase; }
.section-head h2 { font-size: 30px; color: var(--primary); margin: 6px 0; }
.section-head .line { width: 46px; height: 3px; background: var(--accent); margin: 12px auto 0; }

/* 占位符通用样式 */
.ph-box {
  background: linear-gradient(135deg, #ececec, #f6f6f6);
  border: 1px dashed #c9c9c9; border-radius: 6px;
  color: #9a9a9a; display: flex; flex-direction: column;
  align-items: center; justify-content: center; text-align: center;
}
.ph-box .ph-icon { font-size: 30px; margin-bottom: 8px; opacity: .6; }
.ph-box .ph-tip { font-size: 12px; letter-spacing: 1px; }
.ph-text {
  color: #9a9a9a; font-size: 13px; background: var(--bg-gray);
  border: 1px dashed #c9c9c9; border-radius: 4px; padding: 12px 16px;
  text-align: center;
}

/* ---------- 产品分类卡片 ---------- */
.cat-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
.cat-card {
  background: #fff; border: 1px solid var(--border); border-radius: 6px;
  overflow: hidden; transition: transform .25s, box-shadow .25s;
}
.cat-card:hover { transform: translateY(-6px); box-shadow: 0 10px 28px rgba(34,73,153,.15); }
.cat-card .cat-img { height: 150px; }
.cat-card .cat-img .ph-box { height: 100%; border-radius: 0; border: none; }
.cat-card .cat-body { padding: 14px 16px; }
.cat-card .cat-body h3 { font-size: 16px; color: var(--primary); margin-bottom: 6px; }
.cat-card .cat-body p { font-size: 12px; color: var(--text-light); }
.cat-card .cat-more { display: inline-block; margin-top: 10px; font-size: 12px; color: var(--accent); }

/* ---------- 关于我们 ---------- */
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: center; }
.about-img .ph-box { height: 320px; }
.about-text h3 { font-size: 22px; color: var(--primary); margin-bottom: 16px; }
.about-text p { margin-bottom: 12px; color: #555; }
.about-text .btn { margin-top: 16px; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-block; padding: 10px 28px; border-radius: 4px;
  background: var(--primary); color: #fff; font-size: 14px; cursor: pointer;
  transition: background .2s;
}
.btn:hover { background: #1b3a7a; }
.btn-outline { background: transparent; border: 1px solid var(--primary); color: var(--primary); }
.btn-outline:hover { background: var(--primary); color: #fff; }

/* ---------- 新闻 ---------- */
.news-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.news-tabs { display: flex; gap: 0; margin-bottom: 20px; border-bottom: 2px solid var(--primary); }
.news-tabs li a {
  display: block; padding: 10px 24px; font-size: 15px; color: var(--text);
}
.news-tabs li.active a, .news-tabs li a:hover { background: var(--primary); color: #fff; }
.news-list li {
  display: flex; justify-content: space-between; align-items: center;
  padding: 13px 4px; border-bottom: 1px dashed var(--border);
}
.news-list li a { color: var(--text); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.news-list li a:hover { color: var(--primary); }
.news-list li .date { color: var(--text-light); font-size: 12px; white-space: nowrap; margin-left: 12px; }
.news-list li .tag {
  display: inline-block; background: var(--accent); color: #fff; font-size: 11px;
  padding: 1px 6px; border-radius: 2px; margin-right: 8px;
}

/* ---------- 技术服务入口 ---------- */
.service-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
.service-card {
  text-align: center; padding: 32px 20px; background: #fff;
  border: 1px solid var(--border); border-radius: 6px; transition: all .25s;
}
.service-card:hover { background: var(--primary); color: #fff; }
.service-card .s-icon { font-size: 40px; color: var(--primary); margin-bottom: 14px; }
.service-card:hover .s-icon { color: #fff; }
.service-card h3 { font-size: 17px; margin-bottom: 8px; }
.service-card p { font-size: 12px; color: var(--text-light); }
.service-card:hover p { color: rgba(255,255,255,.8); }

/* ---------- 页脚 ---------- */
.footer { background: #1b2f56; color: #c6d2e8; padding: 46px 0 20px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1.2fr; gap: 36px; margin-bottom: 30px; }
.footer h4 { color: #fff; font-size: 15px; margin-bottom: 16px; position: relative; padding-bottom: 8px; }
.footer h4::after { content: ''; position: absolute; left: 0; bottom: 0; width: 26px; height: 2px; background: var(--primary-light); }
.footer-links li { margin-bottom: 9px; }
.footer-links a:hover { color: #fff; }
.footer-contact li { margin-bottom: 9px; font-size: 13px; }
.footer-qr .ph-box { width: 110px; height: 110px; background: #243a63; border-color: #3a517c; color: #8ba0c4; }
.footer-bottom {
  border-top: 1px solid #2c3f68; padding-top: 18px; text-align: center;
  font-size: 12px; color: #8ba0c4;
}
.footer-bottom a { color: #8ba0c4; }
.footer-bottom a:hover { color: #fff; }

/* ---------- 内页横幅 ---------- */
.page-banner {
  height: 180px; display: flex; align-items: center; justify-content: center;
  background: linear-gradient(135deg, #1b3a7a, #224999 50%, #6fa8dc);
  color: #fff; text-align: center;
}
.page-banner h1 { font-size: 32px; letter-spacing: 4px; margin-bottom: 8px; }
.page-banner .crumb { font-size: 13px; opacity: .85; }
.page-banner .crumb a:hover { text-decoration: underline; }

/* ---------- 内页主体布局 ---------- */
.page-body { padding: 40px 0 60px; }
.page-layout { display: grid; grid-template-columns: 260px 1fr; gap: 32px; }
.sidebar {
  background: #fff; border: 1px solid var(--border); border-radius: 6px; overflow: hidden;
}
.sidebar .side-title {
  background: var(--primary); color: #fff; padding: 14px 20px; font-size: 16px;
}
.sidebar ul li a {
  display: block; padding: 12px 20px; border-bottom: 1px solid #f0f0f0;
  color: var(--text); font-size: 14px;
}
.sidebar ul li a:hover, .sidebar ul li.active a { color: var(--primary); background: var(--bg-gray); padding-left: 26px; }
.main-content h2 { font-size: 20px; color: var(--primary); margin-bottom: 20px; padding-bottom: 10px; border-bottom: 2px solid var(--primary); }
.main-content .ph-block { min-height: 260px; margin-bottom: 20px; }

/* 产品网格 */
.prod-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.prod-card { background: #fff; border: 1px solid var(--border); border-radius: 6px; overflow: hidden; }
.prod-card .prod-img { height: 170px; }
.prod-card .prod-img .ph-box { height: 100%; border: none; border-radius: 0; }
.prod-card .prod-body { padding: 14px; }
.prod-card .prod-body h3 { font-size: 15px; color: var(--primary); margin-bottom: 6px; }
.prod-card .prod-body p { font-size: 12px; color: var(--text-light); }

/* 面包屑当前页 */
.crumb .cur { color: #fff; }

/* 响应式 */
@media (max-width: 900px) {
  .cat-grid, .service-grid { grid-template-columns: repeat(2, 1fr); }
  .about-grid, .news-grid { grid-template-columns: 1fr; }
  .page-layout { grid-template-columns: 1fr; }
  .prod-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .header-inner { flex-wrap: wrap; height: auto; padding: 14px 0; }
  .banner-slide { height: 320px; }
}
@media (max-width: 600px) {
  .cat-grid, .service-grid, .prod-grid { grid-template-columns: 1fr; }
  .nav-list { flex-wrap: wrap; }
  .nav-item > a { padding: 10px 14px; font-size: 14px; }
}