/* ==========================================================
   北检(北京)检测技术研究院 - 全站样式
   目录：
   01 Reset / 基础
   02 通用组件（按钮、栏目头等）
   03 顶部通栏 / 头部 / 导航
   04 首页轮播
   05 服务优势条 / 关于我们 / 数据统计
   06 检测项目卡片 / 仪器设备 / 服务流程 / 新闻
   07 CTA横幅
   08 内页Banner / 面包屑
   09 列表页（侧栏 + 列表 + 分页）
   10 内容页（正文排版 / 上下篇 / 相关阅读）
   11 关于我们 / 荣誉资质 / 仪器设备页
   12 页脚 / 浮动栏
   13 响应式
   ========================================================== */

/* ---------- 01 Reset / 基础 ---------- */
:root {
  --c-primary: #0d4a8f;
  --c-primary-d: #0a3a72;
  --c-blue: #0f5bb5;
  --c-blue-l: #eaf3fc;
  --c-orange: #ff7a1a;
  --c-text: #33383f;
  --c-text2: #6b7480;
  --c-line: #e6ebf2;
  --c-bg: #f5f7fa;
  --c-head: #0b2c54;
  --shadow: 0 8px 24px rgba(13, 74, 143, .10);
  --radius: 8px;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  font-family: "Microsoft YaHei", "PingFang SC", "Hiragino Sans GB", "Helvetica Neue", Arial, sans-serif;
  font-size: 14px;
  color: var(--c-text);
  line-height: 1.75;
  background: #fff;
}
ul, ol { list-style: none; }
a { color: var(--c-blue); text-decoration: none; transition: color .2s; }
a:hover { color: var(--c-orange); }
img { max-width: 100%; height: auto; vertical-align: middle; border: 0; }
button { font-family: inherit; cursor: pointer; border: 0; background: none; }
input { font-family: inherit; }
strong, b { font-weight: 700; }
em, i { font-style: normal; }
address { font-style: normal; }
table { border-collapse: collapse; }

.container { max-width: 1400px; margin: 0 auto; padding: 0 16px; }

.sr-only {
  position: absolute; width: 1px; height: 1px; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; padding: 0;
}
.skip-link {
  position: absolute; left: -999px; top: 0; z-index: 999;
  background: var(--c-primary); color: #fff; padding: 8px 18px; border-radius: 0 0 6px 0;
}
.skip-link:focus { left: 0; color: #fff; }

/* ---------- 02 通用组件 ---------- */
.btn {
  display: inline-block; padding: 10px 26px; font-size: 15px;
  border-radius: 4px; transition: all .25s; line-height: 1.5; border: 1px solid transparent;
}
.btn-primary { background: var(--c-orange); color: #fff; }
.btn-primary:hover { background: #ff8f42; color: #fff; transform: translateY(-2px); box-shadow: 0 8px 18px rgba(255, 122, 26, .35); }
.btn-ghost { border-color: rgba(255, 255, 255, .75); color: #fff; }
.btn-ghost:hover { background: rgba(255, 255, 255, .14); color: #fff; }
.btn-lg { padding: 13px 34px; font-size: 16px; }
.btn-more {
  display: inline-block; padding: 7px 22px; font-size: 13px;
  border: 1px solid var(--c-blue); color: var(--c-blue); border-radius: 3px;
}
.btn-more:hover { background: var(--c-blue); color: #fff; }

.section { padding: 64px 0; }
.section-gray { background: var(--c-bg); }
.section-head { position: relative; text-align: center; margin-bottom: 40px; }
.sec-title { font-size: 28px; color: var(--c-head); letter-spacing: 1px; }
.sec-title::after {
  content: ""; display: block; width: 46px; height: 3px;
  background: var(--c-orange); margin: 12px auto 0; border-radius: 2px;
}
.sec-sub { color: var(--c-text2); margin-top: 12px; font-size: 14px; }
.sec-more {
  position: absolute; right: 0; bottom: 6px; font-size: 14px; color: var(--c-text2);
}
.sec-more:hover { color: var(--c-orange); }

/* ---------- 03 头部 / 导航 ---------- */
.site-header { position: relative; z-index: 100; background: #fff; }

.header-main { padding: 12px 0; }
.header-flex { display: flex; align-items: center; gap: 30px; }
.logo { display: flex; align-items: center; flex-shrink: 0; }
.logo img { display: block; width: auto; height: auto; max-width: 100%; }

.header-hotline { margin-left: auto; text-align: left; padding-left: 26px; border-left: 1px dashed var(--c-line); flex-shrink: 0; }
.hl-num a { font-size: 24px; font-weight: 700; color: var(--c-orange); font-family: Arial, "Microsoft YaHei", sans-serif; }
.hl-num a:hover { color: var(--c-orange); opacity: .85; }
.header-hotline em { display: block; font-size: 12px; color: var(--c-text2); }

.nav-toggle { display: none; }

.main-nav {
  background: linear-gradient(90deg, var(--c-primary-d), var(--c-primary) 45%, #1668d0);
  position: sticky; top: 0; z-index: 100;
}
.main-nav.nav-stuck { box-shadow: 0 4px 16px rgba(11, 44, 84, .28); }
.nav-list { display: flex; }
.nav-item { flex: 1; text-align: center; position: relative; }
.nav-item > a {
  display: block; color: #fff; font-size: 16px; line-height: 52px; letter-spacing: 1px; position: relative;
}
.nav-item > a:hover, .nav-item.is-current > a { color: #fff; background: rgba(255, 255, 255, .12); }
.nav-item.is-current > a::after {
  content: ""; position: absolute; left: 50%; transform: translateX(-50%); bottom: 0;
  width: 26px; height: 3px; background: var(--c-orange); border-radius: 2px 2px 0 0;
}
.caret {
  display: inline-block; width: 0; height: 0; margin-left: 4px; vertical-align: 2px;
  border: 4px solid transparent; border-top-color: currentColor; border-bottom: 0;
}
.sub-toggle { display: none; }

/* 二级下拉 */
.has-drop { position: relative; }
.drop-menu {
  position: absolute; left: 50%; transform: translateX(-50%); top: 100%;
  min-width: 150px; background: #fff; box-shadow: var(--shadow); border-top: 3px solid var(--c-orange);
  opacity: 0; visibility: hidden; transition: all .22s; z-index: 99; padding: 6px 0;
}
.nav-item:hover .drop-menu, .nav-item:focus-within .drop-menu {
  opacity: 1; visibility: visible; transform: translateX(-50%) translateY(0);
}
.drop-menu a {
  display: block; padding: 9px 18px; color: var(--c-text); font-size: 14px; white-space: nowrap;
}
.drop-menu a:hover { background: var(--c-blue-l); color: var(--c-blue); }

/* 检测项目巨型菜单 */
.has-mega { position: static; }
.mega-menu {
  position: absolute; left: 0; right: 0; top: 100%;
  background: #fff; box-shadow: 0 18px 40px rgba(11, 44, 84, .16); border-top: 3px solid var(--c-orange);
  opacity: 0; visibility: hidden; transition: all .22s; z-index: 99;
}
.nav-item.has-mega:hover .mega-menu, .nav-item.has-mega:focus-within .mega-menu {
  opacity: 1; visibility: visible;
}
.mega-inner { display: grid; grid-template-columns: repeat(6, 1fr); gap: 8px; padding: 26px 16px 30px; }
.mega-col h3 a {
  display: block; font-size: 15px; color: var(--c-head); padding: 0 0 9px; margin-bottom: 9px;
  border-bottom: 1px solid var(--c-line); position: relative;
}
.mega-col h3 a::before {
  content: ""; position: absolute; left: 0; bottom: -1px; width: 34px; height: 2px; background: var(--c-blue);
}
.mega-col ul a {
  display: block; padding: 5px 0 5px 14px; color: var(--c-text2); font-size: 13px; position: relative;
}
.mega-col ul a::before {
  content: ""; position: absolute; left: 0; top: 50%; width: 5px; height: 5px; margin-top: -2.5px;
  border-radius: 50%; background: #c4d2e4; transition: all .2s;
}
.mega-col ul a:hover { color: var(--c-blue); }
.mega-col ul a:hover::before { background: var(--c-orange); }

/* ---------- 04 首页banner ---------- */
.hero { position: relative; min-height: calc(100vh - 142px); overflow: hidden; background: var(--c-primary-d); }
.hero .pb-video {
  position: absolute; inset: 0; width: 100%; height: 100%;
  object-fit: cover; z-index: 0;
}
.hero::after {
  content: ""; position: absolute; inset: 0; z-index: 1;
  background: linear-gradient(100deg, rgba(7, 28, 56, .68) 0%, rgba(11, 44, 84, .42) 55%, rgba(13, 74, 143, .30) 100%);
}
.hero-slide {
  position: absolute; inset: 0; background-size: cover; background-position: center; z-index: 2;
}
.hero-slide .container { height: 100%; display: flex; align-items: center; }
.hero-caption { max-width: 640px; color: #fff; }
.hero-tag {
  display: inline-block; font-size: 13px; letter-spacing: 2px; padding: 4px 16px;
  border: 1px solid rgba(255, 255, 255, .55); border-radius: 20px; margin-bottom: 18px;
  background: rgba(255, 255, 255, .08);
}
.hero-caption h2 { font-size: 40px; line-height: 1.35; letter-spacing: 1px; text-shadow: 0 2px 12px rgba(8, 44, 88, .45); }
.hero-desc { margin-top: 14px; font-size: 15px; color: #dbe7f5; max-width: 560px; }
.hero-btns { margin-top: 26px; display: flex; gap: 14px; flex-wrap: wrap; }

/* ---------- 05 服务数据条（悬浮于banner之上） ---------- */
.service-strip { position: relative; z-index: 6; margin-top: -104px; }
.strip-grid {
  display: grid; grid-template-columns: repeat(4, 1fr);
  background: #fff; border-radius: 14px;
  box-shadow: 0 22px 48px rgba(11, 44, 84, .16);
}
.strip-item {
  position: relative;
  display: flex; align-items: center; justify-content: center; gap: 16px;
  padding: 30px 14px; border-left: 1px solid var(--c-line);
  transition: background .25s;
}
.strip-item:first-child { border-left: 0; border-radius: 14px 0 0 14px; }
.strip-item:last-child { border-radius: 0 14px 14px 0; }
.strip-item::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: 0; height: 3px;
  background: var(--c-orange); transform: scaleX(0); transition: transform .3s;
}
.strip-item:hover { background: #f8fbff; }
.strip-item:hover::after { transform: scaleX(1); }
.strip-num {
  font-size: 38px; font-weight: 700; color: var(--c-blue); line-height: 1;
  font-family: Arial, "Microsoft YaHei", sans-serif;
}
.strip-num i { color: var(--c-orange); font-size: 20px; }
.strip-text { font-size: 15px; color: var(--c-head); font-weight: 700; line-height: 1.55; }
.strip-text b { display: block; font-size: 12px; color: var(--c-text2); font-weight: 400; margin-top: 3px; }

.about-grid { display: grid; grid-template-columns: 460px 1fr; gap: 46px; align-items: center; }
.about-media { position: relative; }
.about-media img { border-radius: var(--radius); display: block; width: 100%; }
.about-body .sec-title, .about-body .sec-sub { text-align: left; }
.about-body .sec-title::after { margin-left: 0; }
.about-body > p { margin-top: 14px; color: var(--c-text2); text-align: justify; }
.about-body > p:first-of-type { margin-top: 20px; }
.about-list { margin-top: 16px; }
.about-list li {
  position: relative; padding: 7px 0 7px 22px; color: var(--c-text);
}
.about-list li::before {
  content: ""; position: absolute; left: 2px; top: 16px; width: 8px; height: 8px;
  background: var(--c-orange); border-radius: 2px; transform: rotate(45deg);
}
.about-body .btn-more { margin-top: 18px; }
.feature-row {
  margin-top: 46px; display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px;
}
.feature-item {
  background: linear-gradient(180deg, #f4f9ff 0%, #ecf4fd 100%);
  border: 1px solid #dfe9f5; border-radius: 12px;
  text-align: center; padding: 28px 20px;
  transition: all .3s;
}
.feature-item:hover {
  background: #fff; border-color: #c9def3; transform: translateY(-6px);
  box-shadow: 0 16px 34px rgba(15, 91, 181, .12);
}
.feature-item h3 { color: var(--c-head); font-size: 17px; letter-spacing: 2px; }
.feature-item h3::before {
  content: ""; display: block; width: 26px; height: 3px;
  background: var(--c-orange); margin: 0 auto 12px; border-radius: 2px;
}
.feature-item p { margin-top: 8px; color: var(--c-text2); font-size: 13px; line-height: 1.7; }

/* ---------- 06 检测项目 / 仪器 / 流程 / 新闻 ---------- */
/* 检测项目：浅色通栏背景 */
.section-cats {
  background: linear-gradient(120deg, #e9f2fc 0%, #f3f8fe 48%, #e7f1fb 100%);
  position: relative; overflow: hidden;
}
.section-cats::before {
  content: ""; position: absolute; right: -150px; top: -190px; width: 540px; height: 540px;
  border-radius: 50%; border: 1px solid rgba(15, 91, 181, .10);
  box-shadow: 0 0 0 70px rgba(15, 91, 181, .04), 0 0 0 150px rgba(15, 91, 181, .03);
}
.section-cats::after {
  content: ""; position: absolute; left: -170px; bottom: -240px; width: 460px; height: 460px;
  border-radius: 50%; background: radial-gradient(circle, rgba(15, 91, 181, .07) 0%, rgba(15, 91, 181, 0) 68%);
}
.section-cats .container { position: relative; z-index: 1; }

.cat-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; }
.cat-card {
  background: #fff; border: 1px solid #dfe9f5; border-radius: 12px; padding: 30px 28px 24px;
  position: relative; overflow: hidden; transition: all .3s;
  box-shadow: 0 10px 26px rgba(15, 91, 181, .08);
}
.cat-card::before {
  content: ""; position: absolute; left: 0; top: 0; width: 100%; height: 4px;
  background: linear-gradient(90deg, var(--c-blue), var(--c-orange));
  transform: scaleX(0); transform-origin: left; transition: transform .35s;
}
.cat-card::after {
  content: ""; position: absolute; right: -34px; top: -34px; width: 116px; height: 116px;
  border-radius: 50%; background: var(--c-blue-l); opacity: .65; transition: all .35s;
}
.cat-card:hover { transform: translateY(-8px); box-shadow: 0 22px 44px rgba(15, 91, 181, .16); border-color: #c9def3; }
.cat-card:hover::before { transform: scaleX(1); }
.cat-card:hover::after { transform: scale(1.45); opacity: .85; }
.cat-icon { width: 84px; height: 84px; position: relative; z-index: 1; transition: transform .35s; }
.cat-card:hover .cat-icon { transform: scale(1.06) rotate(-4deg); }
.cat-card h3 { font-size: 20px; margin-top: 16px; position: relative; z-index: 1; }
.cat-card h3 a { color: var(--c-head); }
.cat-card h3 a:hover { color: var(--c-blue); }
.cat-card ul {
  margin-top: 12px; padding-top: 12px; border-top: 1px dashed var(--c-line);
  display: grid; grid-template-columns: 1fr 1fr; gap: 6px 12px; position: relative; z-index: 1;
}
.cat-card ul a { color: var(--c-text2); font-size: 13px; padding-left: 14px; position: relative; transition: color .2s; }
.cat-card ul a::before {
  content: ""; position: absolute; left: 0; top: 50%; margin-top: -4px;
  width: 6px; height: 6px; border-radius: 2px; background: var(--c-blue);
  opacity: .45; transform: rotate(45deg); transition: all .2s;
}
.cat-card ul a:hover { color: var(--c-orange); }
.cat-card ul a:hover::before { background: var(--c-orange); opacity: 1; }
.cat-more {
  display: inline-block; margin-top: 16px; font-size: 13px; font-weight: 700;
  color: var(--c-blue); position: relative; z-index: 1;
}
.cat-more span { margin-left: 4px; transition: margin .2s; }
.cat-more:hover span { margin-left: 8px; }

.eq-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.eq-card {
  background: #fff; border: 1px solid var(--c-line); border-radius: var(--radius);
  overflow: hidden; transition: all .3s; display: flex; flex-direction: column;
}
.eq-card:hover { transform: translateY(-6px); box-shadow: var(--shadow); }
.eq-thumb { display: block; overflow: hidden; aspect-ratio: 3 / 2; background: #f0f5fb; }
.eq-thumb img { width: 100%; height: 100%; object-fit: cover; transition: transform .4s; }
.eq-card:hover .eq-thumb img { transform: scale(1.06); }
.eq-body { padding: 16px 18px 20px; }
.eq-body h3 { font-size: 15px; line-height: 1.5; min-height: 45px; }
.eq-body h3 a { color: var(--c-head); }
.eq-body h3 a:hover { color: var(--c-blue); }
.eq-body > p { margin-top: 8px; font-size: 13px; color: var(--c-text2); }
.eq-model { font-size: 12px !important; color: #97a3b4 !important; }
.eq-grid-page .eq-card .eq-body h3 { min-height: 0; }

.eq-table-wrap {
  margin-top: 46px; border: 1px solid var(--c-line); border-radius: var(--radius);
  overflow: hidden; box-shadow: 0 8px 24px rgba(15, 91, 181, .08);
}
.eq-table { width: 100%; border-collapse: collapse; font-size: 14px; background: #fff; }
.eq-table caption {
  caption-side: top; text-align: left; font-weight: 700; font-size: 16px;
  color: var(--c-head); padding: 14px 18px; background: var(--c-blue-l);
}
.eq-table th { background: var(--c-primary); color: #fff; padding: 11px 16px; text-align: left; white-space: nowrap; }
.eq-table td { padding: 10px 16px; border-bottom: 1px solid var(--c-line); color: var(--c-text); }
.eq-table td:first-child { font-family: Arial, sans-serif; color: var(--c-blue); font-weight: 700; }
.eq-table tbody tr:nth-child(even) { background: #fafcfe; }
.eq-table tbody tr:hover { background: var(--c-blue-l); }

.process-steps {
  counter-reset: step; display: grid; grid-template-columns: repeat(6, 1fr); gap: 18px;
}
.process-steps li {
  background: #fff; border-radius: var(--radius); text-align: center; padding: 28px 10px 22px;
  border: 1px solid var(--c-line); position: relative; transition: all .3s;
}
.process-steps li:hover { border-color: var(--c-blue); transform: translateY(-4px); box-shadow: var(--shadow); }
.step-num {
  display: block; font-size: 30px; font-weight: 700; color: var(--c-blue-l);
  -webkit-text-stroke: 1px var(--c-blue); font-family: Arial, sans-serif; line-height: 1;
}
.process-steps h3 { font-size: 16px; color: var(--c-head); margin-top: 10px; }
.process-steps li p { font-size: 12px; color: var(--c-text2); margin-top: 6px; }

.news-grid { display: grid; grid-template-columns: 5fr 7fr; gap: 30px; }
.news-featured { background: #fff; border: 1px solid var(--c-line); border-radius: var(--radius); overflow: hidden; transition: all .3s; }
.news-featured:hover { box-shadow: var(--shadow); }
.nf-img { display: block; aspect-ratio: 16 / 10; overflow: hidden; }
.nf-img img { width: 100%; height: 100%; object-fit: cover; transition: transform .4s; }
.news-featured:hover .nf-img img { transform: scale(1.05); }
.nf-body { padding: 20px 24px 24px; }
.nf-body time { font-size: 12px; color: #97a3b4; }
.nf-body h3 { margin-top: 8px; font-size: 19px; line-height: 1.5; }
.nf-body h3 a { color: var(--c-head); }
.nf-body h3 a:hover { color: var(--c-blue); }
.nf-body p { margin-top: 10px; font-size: 13px; color: var(--c-text2); }
.news-list { display: flex; flex-direction: column; gap: 14px; }
.news-row {
  display: flex; gap: 18px; align-items: center; background: #fff;
  border: 1px solid var(--c-line); border-radius: var(--radius); padding: 16px 20px; transition: all .3s;
}
.news-row:hover { border-color: var(--c-blue); box-shadow: var(--shadow); }
.nr-date {
  flex-shrink: 0; width: 92px; text-align: center;
  border-right: 1px solid var(--c-line); padding-right: 14px;
  font-size: 13px; color: #97a3b4; font-family: Arial, "Microsoft YaHei", sans-serif;
}
.nr-body h3 { font-size: 16px; line-height: 1.5; }
.nr-body h3 a { color: var(--c-head); }
.nr-body h3 a:hover { color: var(--c-orange); }
.nr-body p {
  margin-top: 5px; font-size: 13px; color: var(--c-text2);
  display: -webkit-box; -webkit-line-clamp: 1; -webkit-box-orient: vertical; overflow: hidden;
}

/* ---------- 07 内页Banner / 面包屑 ---------- */
.page-banner {
  background-size: cover; background-position: center; padding: 52px 0 44px; position: relative;
}
.page-banner::after { content: ""; position: absolute; inset: 0; background: rgba(8, 34, 66, .25); }
/* 白亮视频画面的加深遮罩（荣誉页证书墙） */
.page-banner.banner-darken::after { content: ""; position: absolute; inset: 0; background: rgba(8, 28, 56, .62); }
.page-banner .container { position: relative; z-index: 2; }
.page-title { color: #fff; font-size: 30px; letter-spacing: 2px; }
.breadcrumb { margin-top: 10px; font-size: 13px; }
.breadcrumb ol { display: flex; flex-wrap: wrap; gap: 4px 0; }
.breadcrumb li { color: #c9d9ec; display: flex; align-items: center; }
.breadcrumb li + li::before { content: ">"; margin: 0 8px; color: #7f97b8; }
.breadcrumb a { color: #dbe7f5; }
.breadcrumb a:hover { color: #ffb45a; }
.breadcrumb li[aria-current] { color: #fff; }

/* 内页视频banner（桌面端） */
.banner-video {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  min-height: 440px; padding: 40px 16px;
  background: linear-gradient(118deg, #071c38 0%, #0b2c54 45%, #0d4a8f 100%);
}
.banner-video .container { width: 100%; text-align: center; }
.banner-video .breadcrumb ol { justify-content: center; }
.banner-video .pb-video {
  position: absolute; inset: 0; width: 100%; height: 100%;
  object-fit: cover; opacity: .55;
}
.banner-video::after { background: rgba(8, 28, 56, .35); }
/* 加高版（关于/荣誉页） */
.banner-video.banner-tall { min-height: 540px; }
/* 白亮视频画面的加深遮罩（荣誉页证书墙） */
.page-banner.banner-darken::after { content: ""; position: absolute; inset: 0; background: rgba(8, 28, 56, .62); }

/* ---------- 09 列表页 ---------- */
.page-layout {
  display: grid; grid-template-columns: 264px 1fr; gap: 26px; align-items: start;
  padding: 34px 16px 60px;
}
.layout-article { grid-template-columns: 1fr 264px; }
.sidebar { display: flex; flex-direction: column; gap: 20px; position: sticky; top: 16px; }
.side-box { background: #fff; border: 1px solid var(--c-line); border-radius: var(--radius); overflow: hidden; }
.side-title {
  font-size: 17px; color: #fff; background: linear-gradient(90deg, var(--c-primary-d), var(--c-primary));
  padding: 12px 18px; letter-spacing: 1px;
}
.cate-nav { padding: 8px 0 4px; }
.cate-group { border-bottom: 1px dashed var(--c-line); margin: 0 14px; }
.cate-group:last-child { border-bottom: 0; }
.cate-toggle {
  display: flex; justify-content: space-between; align-items: center; width: 100%;
  padding: 11px 4px; color: #000; font-size: 15px; font-weight: 700;
  background: none; text-align: left; cursor: pointer; list-style: none;
  transition: background .2s;
}
.cate-toggle::-webkit-details-marker { display: none; }
.cate-toggle:hover { color: #000; background: var(--c-blue-l); }
.cate-toggle .caret {
  display: inline-block; flex-shrink: 0; margin-left: 8px;
  border: 5px solid transparent; border-top-color: #b7c3d4; border-bottom: 0;
  transition: transform .25s;
}
.cate-group[open] .cate-toggle { color: #000; }
.cate-group[open] .cate-toggle .caret { transform: rotate(180deg); border-top-color: var(--c-blue); }
.cate-sub { padding: 2px 0 10px; }
.cate-sub a {
  display: block; padding: 6px 4px 6px 14px; color: var(--c-text2); font-size: 13px;
  position: relative; transition: color .2s;
}
.cate-sub a::before {
  content: ""; position: absolute; left: 2px; top: 50%; width: 4px; height: 4px;
  border-radius: 50%; background: #c4d2e4; margin-top: -2px; transition: background .2s;
}
.cate-sub a:hover { color: var(--c-orange); }
.cate-sub a:hover::before { background: var(--c-orange); }
.cate-sub .cate-all { font-weight: 700; color: var(--c-blue); }

.side-contact { background: linear-gradient(150deg, var(--c-primary-d), var(--c-primary)); border: 0; }
.side-contact .side-title { background: none; padding-bottom: 6px; }
.side-contact .sc-btn { text-align: center; padding: 8px 18px 2px; }
.sc-consult {
  display: block; padding: 11px 0; background: var(--c-orange); color: #fff;
  border-radius: 22px; font-size: 15px; font-weight: 700; letter-spacing: 1px;
  transition: all .2s;
}
.sc-consult:hover { background: #fff; color: var(--c-orange); }
.side-contact .sc-sub {
  text-align: center; color: #c9d9ec; font-size: 12px;
  margin: 6px 18px 10px; padding: 0 0 10px;
  border-bottom: 1px dashed rgba(255, 255, 255, .22);
}
.side-contact ul { padding: 12px 18px 16px; }
.side-contact li { color: #dbe7f5; font-size: 12px; padding: 4px 0; line-height: 1.6; }

/* 侧栏资质切换 */
.side-certs .cert-show {
  margin: 14px 14px 0; height: 320px; border: 1px solid var(--c-line); border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
  overflow: hidden; background: #fff;
}
.side-certs .cert-show img {
  max-width: 100%; max-height: 100%; width: auto; height: auto;
  object-fit: contain; transition: opacity .18s;
}
.cert-nav { display: flex; justify-content: center; align-items: center; gap: 12px; padding: 10px 0 2px; }
.cert-btn {
  width: 30px; height: 30px; border-radius: 50%; border: 1px solid var(--c-line);
  color: var(--c-blue); font-size: 16px; line-height: 1; background: #fff;
  cursor: pointer; transition: all .2s;
}
.cert-btn:hover { background: var(--c-blue); color: #fff; border-color: var(--c-blue); }
.cert-idx { font-size: 12px; color: #97a3b4; font-family: Arial, sans-serif; }
.cert-name { text-align: center; padding: 8px 14px 14px; font-size: 13px; font-weight: 700; color: var(--c-head); }

.list-wrap { display: flex; flex-direction: column; gap: 18px; min-height: 300px; }
.list-item {
  background: #fff; border: 1px solid var(--c-line); border-radius: var(--radius);
  padding: 20px 24px; transition: all .3s;
}
.list-item:hover { border-color: var(--c-blue); box-shadow: var(--shadow); }
.li-title { font-size: 17px; line-height: 1.5; }
.li-title a { color: var(--c-head); }
.li-title a:hover { color: var(--c-blue); }
.li-excerpt {
  margin-top: 8px; font-size: 13px; color: var(--c-text2);
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}
.li-meta { margin-top: 10px; font-size: 12px; color: #97a3b4; display: flex; gap: 16px; }
.list-empty {
  background: #fff; border: 1px dashed var(--c-line); border-radius: var(--radius);
  text-align: center; padding: 70px 20px; color: var(--c-text2);
}
.list-empty p + p { margin-top: 8px; }

.pagination { margin-top: 30px; display: flex; justify-content: center; gap: 8px; flex-wrap: wrap; }
.pg-num, .pg-disabled {
  min-width: 38px; text-align: center; padding: 8px 14px; font-size: 14px;
  background: #fff; border: 1px solid var(--c-line); border-radius: 4px; color: var(--c-text2);
}
.pg-num:hover { border-color: var(--c-blue); color: var(--c-blue); }
.pg-num.is-active { background: var(--c-blue); border-color: var(--c-blue); color: #fff; }
.pg-disabled { color: #c0c9d6; }

/* ---------- 10 内容页 ---------- */
.article { background: #fff; border: 1px solid var(--c-line); border-radius: var(--radius); padding: 30px 34px 36px; }
.article-head { border-bottom: 1px solid var(--c-line); padding-bottom: 18px; margin-bottom: 24px; text-align: center; }
.article-title { font-size: 26px; color: var(--c-head); line-height: 1.5; }
.article-meta { margin-top: 14px; font-size: 13px; color: #97a3b4; display: flex; justify-content: center; gap: 22px; flex-wrap: wrap; }
.article-meta a { color: var(--c-blue); }
.article-content { font-size: 15px; line-height: 2; color: #3c434c; }
.article-content p { margin: 12px 0; text-align: justify; }
.article-content h2 {
  font-size: 20px; color: var(--c-head); margin: 26px 0 12px; padding-left: 12px;
  border-left: 4px solid var(--c-orange); line-height: 1.5;
}
.article-content h3 { font-size: 17px; color: var(--c-head); margin: 20px 0 10px; }
.article-content ul, .article-content ol { margin: 10px 0 10px 6px; }
.article-content ul li, .article-content ol li {
  padding: 4px 0 4px 22px; position: relative; text-align: justify;
}
.article-content ul li::before {
  content: ""; position: absolute; left: 6px; top: 16px; width: 7px; height: 7px;
  background: var(--c-blue); border-radius: 50%; opacity: .6;
}
.article-content ol { counter-reset: oli; }
.article-content ol li::before {
  counter-increment: oli; content: counter(oli) ".";
  position: absolute; left: 2px; top: 4px; color: var(--c-blue); font-weight: 700;
}
.article-content table {
  width: 100%; margin: 16px 0; font-size: 14px; border: 1px solid var(--c-line);
}
.article-content th {
  background: var(--c-blue-l); color: var(--c-head); font-weight: 700; padding: 10px 12px;
  border: 1px solid var(--c-line); text-align: left;
}
.article-content td { padding: 9px 12px; border: 1px solid var(--c-line); }
.article-content tr:nth-child(even) td { background: #fafcfe; }
.article-content strong { color: var(--c-orange); }

.article-nav {
  margin-top: 30px; border-top: 1px solid var(--c-line); padding-top: 18px;
  display: grid; gap: 8px; font-size: 14px;
}
.article-nav b { color: var(--c-head); }
.article-nav a { color: var(--c-text2); }
.article-nav a:hover { color: var(--c-orange); }

.rel-box { margin-top: 30px; border: 1px solid var(--c-line); border-radius: var(--radius); overflow: hidden; }
.rel-box .side-title { border-radius: 0; }
.rel-list { padding: 6px 0; }
.rel-list a {
  display: flex; justify-content: space-between; gap: 14px; padding: 10px 20px;
  color: var(--c-text); font-size: 14px; border-bottom: 1px dashed var(--c-line);
}
.rel-list li:last-child a { border-bottom: 0; }
.rel-list a:hover { color: var(--c-blue); background: #fafcfe; }
.rel-list time { color: #97a3b4; font-size: 12px; flex-shrink: 0; }

/* 专家团队 */
.section-team { background: linear-gradient(120deg, #e9f2fc 0%, #f3f8fe 100%); }
.team-grid { display: grid; grid-template-columns: 560px 1fr; gap: 46px; align-items: center; }
.team-media img { width: 100%; border-radius: var(--radius); display: block; }
.team-body .sec-title, .team-body .sec-sub { text-align: left; }
.team-body .sec-title::after { margin-left: 0; }
.team-body > p { margin-top: 16px; color: var(--c-text2); text-align: justify; }
.team-list { margin-top: 16px; }
.team-list li { position: relative; padding: 7px 0 7px 22px; color: var(--c-text); }
.team-list li::before {
  content: ""; position: absolute; left: 2px; top: 16px; width: 8px; height: 8px;
  background: var(--c-orange); border-radius: 2px; transform: rotate(45deg);
}

/* ---------- 11 关于 / 荣誉 / 仪器页 ---------- */
.about-intro-grid { display: grid; grid-template-columns: 1fr 620px; gap: 40px; align-items: stretch; }
.about-intro-grid .sec-title, .about-intro-grid .sec-sub { text-align: left; }
.about-intro-grid .sec-title::after { margin-left: 0; }
.about-intro-grid .about-body-p, .about-intro-grid p { margin-top: 14px; color: var(--c-text2); text-align: justify; }
.about-intro-grid .about-media { height: 100%; }
.about-intro-grid .about-media img {
  border-radius: var(--radius); width: 100%; height: 100%;
  object-fit: cover; display: block;
}

.org-cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.org-card {
  background: #fff; border: 1px solid var(--c-line); border-radius: var(--radius);
  padding: 28px 26px; transition: all .3s; border-top: 3px solid var(--c-blue);
}
.org-card:hover { transform: translateY(-6px); box-shadow: var(--shadow); }
.org-card:nth-child(2) { border-top-color: var(--c-orange); }
.org-card:nth-child(3) { border-top-color: #1e9e6a; }
.org-card h3 { font-size: 19px; color: var(--c-head); }
.org-card > p { margin-top: 8px; font-size: 13px; color: var(--c-text2); }
.org-card ul { margin-top: 14px; border-top: 1px dashed var(--c-line); padding-top: 12px; }
.org-card li { position: relative; padding: 5px 0 5px 18px; font-size: 13px; color: var(--c-text); }
.org-card li::before {
  content: ""; position: absolute; left: 0; top: 14px; width: 8px; height: 8px;
  background: var(--c-blue-l); border: 1px solid var(--c-blue); border-radius: 2px;
}

.adv-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.adv-item {
  background: #fff; border: 1px solid var(--c-line); border-radius: var(--radius);
  padding: 26px 24px; transition: all .3s; position: relative; overflow: hidden;
}
.adv-item::after {
  content: ""; position: absolute; right: -22px; bottom: -22px; width: 90px; height: 90px;
  background: var(--c-blue-l); border-radius: 50%; opacity: .55; transition: all .3s;
}
.adv-item:hover { transform: translateY(-5px); box-shadow: var(--shadow); }
.adv-item:hover::after { transform: scale(1.35); }
.adv-item h3 { font-size: 17px; color: var(--c-head); position: relative; z-index: 1; }
.adv-item h3::before {
  content: ""; display: block; width: 26px; height: 3px; background: var(--c-orange);
  border-radius: 2px; margin-bottom: 12px;
}
.adv-item p { margin-top: 8px; font-size: 13px; color: var(--c-text2); position: relative; z-index: 1; }

.contact-panel { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
.contact-card {
  background: #fff; border: 1px solid var(--c-line); border-radius: var(--radius);
  padding: 24px 22px; border-top: 3px solid var(--c-blue);
}
.contact-card h3 { font-size: 16px; color: var(--c-head); }
.contact-card p { margin-top: 8px; font-size: 14px; color: var(--c-text2); line-height: 1.8; }
.contact-card a { color: var(--c-blue); font-weight: 700; }
.contact-card a:hover { color: var(--c-orange); }

.honor-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.honor-grid-lg { grid-template-columns: repeat(3, 1fr); }
.honor-grid-lg .honor-card { background: #fff; }
.honor-grid-lg .honor-card img {
  width: 100%; max-width: 100%; height: 500px; margin: 0 auto;
  aspect-ratio: auto; object-fit: contain; background: #fff;
}
.honor-grid-zx .honor-card img { aspect-ratio: 4 / 3; object-fit: contain; background: #fff; }
.honor-card {
  background: #fff; border: 1px solid var(--c-line); border-radius: var(--radius);
  overflow: hidden; transition: all .3s;
}
.honor-card:hover { transform: translateY(-6px); box-shadow: var(--shadow); }
.honor-card img { width: 100%; aspect-ratio: 750 / 530; object-fit: cover; transition: transform .4s; }
.honor-card:hover img { transform: scale(1.04); }
.honor-card figcaption {
  text-align: center; padding: 12px 14px; font-size: 14px; color: var(--c-head);
  border-top: 1px solid var(--c-line); background: #fff;
}
.honor-note {
  margin-top: 28px; text-align: center; color: #97a3b4; font-size: 13px;
  background: var(--c-blue-l); border-radius: var(--radius); padding: 12px 18px;
}

/* ---------- 12 页脚 / 浮动栏 ---------- */
.site-footer { background: var(--c-head); color: #a9bcd4; margin-top: 0; }
.footer-grid {
  display: grid; grid-template-columns: 1.5fr 1fr 1fr 1.4fr; gap: 34px; padding: 50px 16px 40px;
}
.footer-logo img { display: block; filter: brightness(0) invert(1); }
.footer-desc { margin-top: 18px; font-size: 13px; line-height: 1.9; text-align: justify; }
.footer-col h3 {
  color: #fff; font-size: 16px; letter-spacing: 1px; margin-bottom: 16px; position: relative; padding-bottom: 10px;
}
.footer-col h3::after {
  content: ""; position: absolute; left: 0; bottom: 0; width: 24px; height: 2px; background: var(--c-orange);
}
.footer-col li { padding: 4px 0; font-size: 13px; }
.footer-col li a { color: #a9bcd4; }
.footer-col li a:hover { color: #ffb45a; padding-left: 4px; }
.footer-contact li { line-height: 1.8; }
.footer-contact li a { color: #ffd9ae; }
.footer-bottom { border-top: 1px solid rgba(255, 255, 255, .1); padding: 16px 0; }
.footer-bottom-inner {
  display: flex; justify-content: space-between; gap: 10px; flex-wrap: wrap;
  font-size: 12px; color: #7f97b8;
}
.footer-bottom a { color: #a9bcd4; }
.footer-bottom a:hover { color: #ffb45a; }

/* ---------- 13 响应式 ---------- */
@media (max-width: 1400px) {
  .header-hotline { padding-left: 18px; }
  .hl-num a { font-size: 21px; }
  .hero-caption h2 { font-size: 34px; }
}

@media (max-width: 1024px) {
  .header-hotline { display: none; }
  .cat-grid, .org-cards, .honor-grid { grid-template-columns: repeat(2, 1fr); }
  .eq-grid { grid-template-columns: repeat(3, 1fr); }
  .process-steps { grid-template-columns: repeat(3, 1fr); }
  .adv-grid, .contact-panel { grid-template-columns: repeat(2, 1fr); }
  .about-grid { grid-template-columns: 1fr; gap: 30px; }
  .about-intro-grid { grid-template-columns: 1fr; }
  .about-intro-grid .about-media { height: auto; }
  .about-intro-grid .about-media img { height: auto; }
  .about-intro-grid .about-media { order: -1; }
  .team-grid { grid-template-columns: 1fr; gap: 24px; }
  .team-media { order: -1; }
  .mega-inner { grid-template-columns: repeat(3, 1fr); }
  .news-grid { grid-template-columns: 1fr; }
  .page-layout { grid-template-columns: 1fr; }
  .page-layout > .page-main { order: -1; }
  .layout-article { grid-template-columns: 1fr; }
  .sidebar { position: static; flex-direction: row; flex-wrap: wrap; }
  .sidebar .side-box { flex: 1 1 300px; }
}

@media (max-width: 860px) {
  /* 移动端：区块右上角链接改为独立一行，避免紧贴标题 */
  .section-head .sec-more { position: static; display: inline-block; margin-top: 12px; }
  /* 移动端：视频banner退回纯色渐变，保持原有左对齐样式 */
  .banner-video, .banner-video.banner-tall { display: block; min-height: 0; padding: 52px 0 44px; }
  .banner-video .pb-video { display: none; }
  .banner-video::after { background: rgba(8, 28, 56, .25); }
  .banner-video .container { text-align: left; }
  .banner-video .breadcrumb ol { justify-content: flex-start; }
  .header-main { padding: 12px 0; }
  .nav-toggle {
    display: block; margin-left: auto; width: 44px; height: 40px;
    border: 1px solid var(--c-line); border-radius: 6px;
    display: flex; flex-direction: column; justify-content: center; align-items: center; gap: 5px;
  }
  .nav-toggle span { display: block; width: 20px; height: 2px; background: var(--c-primary); transition: all .25s; }
  body.nav-open .nav-toggle span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  body.nav-open .nav-toggle span:nth-child(2) { opacity: 0; }
  body.nav-open .nav-toggle span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

  .main-nav { position: relative; z-index: 100; }
  .nav-list { display: none; flex-direction: column; padding: 0; background: var(--c-primary-d); }
  body.nav-open .nav-list {
    display: flex; position: absolute; left: 0; right: 0; top: 100%;
    max-height: calc(100vh - 130px); overflow-y: auto;
    box-shadow: 0 22px 44px rgba(7, 28, 56, .38);
  }
  .nav-item { flex: none; text-align: left; border-bottom: 1px solid rgba(255, 255, 255, .08); position: relative; }
  .nav-item > a { line-height: 48px; padding: 0 16px; font-size: 15px; }
  .nav-item.is-current > a::after { display: none; }
  .nav-item > a .caret { display: none; }
  .sub-toggle {
    display: block; position: absolute; right: 0; top: 0; width: 52px; height: 48px; z-index: 3;
  }
  .sub-toggle::before {
    content: ""; position: absolute; right: 20px; top: 20px; width: 10px; height: 10px;
    border-right: 2px solid rgba(255, 255, 255, .7); border-bottom: 2px solid rgba(255, 255, 255, .7);
    transform: rotate(45deg); transition: transform .25s;
  }
  li.sub-open .sub-toggle::before { transform: rotate(225deg); top: 24px; }

  .drop-menu, .mega-menu {
    position: static; opacity: 1; visibility: hidden; display: none;
    transform: none; box-shadow: none; border-top: 0; background: rgba(255, 255, 255, .04);
    transition: none; padding: 0;
  }
  .main-nav li.sub-open > .drop-menu, .main-nav li.sub-open > .mega-menu {
    display: block; visibility: visible; opacity: 1; transform: none;
  }
  .drop-menu { min-width: 0; }
  .drop-menu a { color: #c8d6e8; padding: 9px 16px 9px 34px; }
  .drop-menu a:hover { background: rgba(255, 255, 255, .06); color: #fff; }
  .mega-inner { display: block; padding: 6px 0; }
  .mega-col h3 { margin: 0; }
  .mega-col h3 a { color: #fff; padding: 9px 16px 9px 30px; border-bottom: 0; font-size: 14px; }
  .mega-col h3 a::before { display: none; }
  .mega-col ul { padding: 0 0 8px; }
  .mega-col ul a { color: #a9bcd4; padding: 6px 16px 6px 46px; }
  .mega-col ul a::before { left: 30px; }

  .hero { height: auto; min-height: 380px; }
  .hero .pb-video { display: none; }
  .hero-caption h2 { font-size: 27px; }
  .hero-desc { font-size: 14px; }
  .service-strip { margin-top: -44px; }
  .strip-grid { grid-template-columns: 1fr 1fr; border-radius: 10px; }
  .strip-item { justify-content: flex-start; padding: 18px 16px; }
  .strip-item:nth-child(odd) { border-left: 0; }
  .strip-item:nth-child(n+3) { border-top: 1px solid var(--c-line); }
  .strip-item::after { display: none; }
  .strip-num { font-size: 26px; }
  .strip-text { font-size: 13px; }
  .section { padding: 44px 0; }
  .feature-row { grid-template-columns: 1fr 1fr; gap: 16px; }
  .feature-item { padding: 24px 14px; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 26px; padding: 40px 16px 30px; }
}

@media (max-width: 620px) {
  .logo img { max-width: 160px; height: auto; }
  .sec-title { font-size: 22px; }
  .page-title { font-size: 24px; }
  .hero { height: 420px; }
  .hero-caption h2 { font-size: 22px; }
  .hero-btns .btn { padding: 9px 20px; font-size: 14px; }
  .cat-grid, .eq-grid, .org-cards, .honor-grid, .process-steps, .adv-grid, .contact-panel { grid-template-columns: 1fr; }
  .process-steps { gap: 12px; }
  .eq-grid { grid-template-columns: repeat(2, 1fr); gap: 14px; }
  .eq-body h3 { font-size: 14px; min-height: 0; }
  .article { padding: 22px 16px 26px; }
  .article-title { font-size: 20px; }
  .article-meta { gap: 10px; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 26px 16px; }
  .footer-grid .footer-about, .footer-grid .footer-contact { grid-column: 1 / -1; }
  .footer-bottom-inner { justify-content: center; text-align: center; }
  .nr-date { display: none; }
}