/* ============================================================
   大连金浩隆 · 全站基础样式（style.css）
   ------------------------------------------------------------
   职责：设计变量 + 公共基础 + 桌面端布局（宽屏 ≥1280px 起）
        手机 / 平板 / 窄窗口的全部覆盖规则都在 css/mobile.css，
        本文件不再写 max-width 媒体查询，两套规则各自独立、互不干扰
   加载：所有页面都加载本文件，随后按条件加载 css/mobile.css
   ============================================================ */
:root {
  --bh-navy: #0a1f3b;          /* 主色 深蓝 */
  --bh-navy-dark: #061327;
  --bh-teal: #02A783;           /* 强调色 BH 绿 */
  --bh-teal-dark: #018a6d;
  --bh-white: #ffffff;
  --bh-text: #1a1a2e;          /* 正文深色 */
  --bh-text-2: #4a5568;        /* 正文灰 */
  --bh-line: #e2e8f0;          /* 分割线 */
  --bh-bg: #f7f9fc;            /* 浅色背景 */
  --font: "Microsoft YaHei", "PingFang SC", -apple-system, BlinkMacSystemFont, "Helvetica Neue", Arial, sans-serif;
  --wrap: 1280px;
}
* { margin:0; padding:0; box-sizing:border-box; }
html { scroll-behavior:smooth; -webkit-font-smoothing:antialiased; -webkit-text-size-adjust:100%; text-size-adjust:100%; }
body { font-family:var(--font); color:var(--bh-text); background:var(--bh-white); line-height:1.7; font-size:15px; overflow-x:hidden; }
body.nav-open { overflow:hidden; }
a { text-decoration:none; color:inherit; transition:color .2s, background .2s, transform .25s, opacity .2s; }
img { max-width:100%; display:block; }
ul { list-style:none; }
button { font-family:var(--font); cursor:pointer; border:none; background:none; }
.wrap { max-width:var(--wrap); width:100%; margin:0 auto; padding:0 40px; }
/* 词组锁定：英文标题里同一个短语不允许在中间断行（断点只留在这个 span 之外） */
.nw { white-space:nowrap; }

/* 快速居中弹性 */
.f-center { display:flex; align-items:center; justify-content:center; }

/* ===========================
   Utility Bar 顶部工具条
   =========================== */
.utbar { background:var(--bh-navy); color:rgba(255,255,255,.55); font-size:12px; line-height:36px; }
.utbar .wrap { display:flex; justify-content:space-between; align-items:center; }
.utbar-links { display:flex; gap:28px; }
.utbar-links a:hover { color:#fff; }
.utbar-right { display:flex; align-items:center; gap:28px; }
.utbar-contact span { color:rgba(255,255,255,.7); }

/* 语言切换：页面右上浅灰胶囊（地球图标 + 语言 + 地区），href 由 nav.js 按当前页生成 */
.bh-lang {
  display:inline-flex; align-items:center; gap:7px;
  height:26px; padding:0 13px;
  border:1px solid rgba(255,255,255,.5); border-radius:999px;
  background:#ececec; color:#1f2531; white-space:nowrap;
  font-size:13px; font-weight:400; line-height:1; letter-spacing:0;
  box-shadow:0 1px 2px rgba(0,0,0,.18);
}
.bh-lang-icon { width:14px; height:14px; flex:none; color:#1f2531; }
.bh-lang-name { font-size:13px; font-weight:700; color:#1f2531; }
.bh-lang-region { font-size:13px; font-weight:400; color:#7c8590; }
.bh-lang:hover { background:#f8f8f8; border-color:#fff; box-shadow:0 2px 8px rgba(0,0,0,.25); }
.bh-lang:hover .bh-lang-region { color:#4a5568; }

/* ===========================
   Mega Navigation 主导航
   =========================== */
.meganav { background:var(--bh-white); position:sticky; top:0; z-index:100; border-bottom:1px solid var(--bh-line); }
.meganav .wrap { display:flex; align-items:center; justify-content:space-between; height:70px; position:relative; }
.bh-logo { display:flex !important; flex-direction:row; align-items:center; gap:12px; text-decoration:none; flex-shrink:0; }
.bh-logo-img { height:46px; width:auto; flex-shrink:0; border-right:2px solid #02A783; padding-right:12px; }
.bh-logo-text { font-size:22px; font-weight:800; color:#0a1f3b; letter-spacing:4px; white-space:nowrap; flex-shrink:0; }
.mega-nav-links { display:flex; align-items:stretch; gap:6px; align-self:stretch; }
.mega-nav-links > a { display:flex; align-items:center; }
.mega-nav-links a { font-size:15px; font-weight:600; color:#6b7280; padding:8px 16px; border-radius:4px; letter-spacing:.2px; }
.mega-nav-links a:hover { color:var(--bh-teal); }
.mega-nav-links a.on { color:var(--bh-teal); }
.mobile-toggle { display:none; background:none; border:none; font-size:24px; color:var(--bh-navy); }

/* --- 导航：产品大菜单 (BH Mega Menu 风格，点击展开) --- */
.nav-has-mega { display:flex; }
.nav-mega-trigger { display:flex; align-items:center; gap:6px; padding:8px 16px; font-size:15px; font-weight:600; color:#6b7280; letter-spacing:.2px; border-bottom:3px solid transparent; }
.nav-mega-trigger:hover { color:var(--bh-teal); }
.nav-mega-trigger.on { color:var(--bh-teal); }
.nav-has-mega.open .nav-mega-trigger { color:var(--bh-teal); border-bottom-color:var(--bh-teal); }
.nav-caret { width:9px; height:6px; flex-shrink:0; transition:transform .25s; }
.nav-has-mega.open .nav-caret { transform:rotate(180deg); }

/* 下拉面板以内容容器为基准，左右各让出 40px（与 .wrap 内边距一致），左边缘正好对齐 JINHAOLONG logo */
.nav-mega { display:none; position:absolute; top:100%; left:40px; right:40px; background:#fff; box-shadow:0 18px 40px rgba(10,31,59,.16); }
.nav-has-mega.open .nav-mega { display:block; }
.nav-mega-inner { display:grid; grid-template-columns:300px minmax(0,1fr); }

.nav-mega-cats { background:#22262d; padding:20px 0 24px; }
.nav-mega-cats li a { display:flex; align-items:center; justify-content:space-between; gap:14px; padding:13px 28px; font-size:16px; font-weight:600; color:#fff; border-bottom:1px solid rgba(255,255,255,.04); }
.nav-mega-cats li a:hover { background:rgba(255,255,255,.05); }
.nav-mega-cats li.active a { color:var(--bh-teal); background:rgba(2,167,131,.14); }
.nav-mega-arrow { width:6px; height:10px; flex-shrink:0; }
.nav-mega-cats .nav-mega-arrow { color:#5c6675; }
.nav-mega-cats li.active .nav-mega-arrow { color:var(--bh-teal); }

.nav-mega-content { padding:30px 48px 36px; }
.nav-mega-panel { display:none; }
.nav-mega-panel.active { display:block; animation:fadeIn .25s ease; }
/* 材料下拉：当前显示标准 */
.nav-mega-std { display:flex; align-items:center; gap:8px; margin-bottom:6px; font-size:10px; font-weight:700; letter-spacing:1.5px; color:#9aa4b2; text-transform:uppercase; }
.nav-mega-std b { color:var(--bh-teal); font-size:10px; letter-spacing:1.5px; }
.nav-mega-panel ul a { display:inline-flex; align-items:center; gap:9px; padding:9px 0; font-size:15px; font-weight:400; color:#6b7280; border-radius:0; }
.nav-mega-panel ul a:hover { color:var(--bh-teal); }
.nav-mega-panel ul a .nav-mega-arrow { color:#c3cad6; transition:transform .2s, color .2s; }
.nav-mega-panel ul a:hover .nav-mega-arrow { color:var(--bh-teal); transform:translateX(3px); }
.nav-mega-desc { font-size:14px; color:var(--bh-text-2); line-height:1.75; max-width:520px; margin-bottom:16px; }

/* ===========================
   Hero 轮播 (三完整 slide)
   =========================== */
.hero-carousel { position:relative; width:100%; height:580px; overflow:hidden; background:var(--bh-navy); }
.hero-slides { position:relative; width:100%; height:100%; }
.hero-slide { position:absolute; inset:0; opacity:0; transition:opacity .8s ease; z-index:1; pointer-events:none; }
.hero-slide.active { opacity:1; z-index:2; pointer-events:auto; }
.hero-slide-bg { position:absolute; inset:0; }
.hero-slide-bg img { width:100%; height:100%; object-fit:cover; }
/* Slide 2 / Slide 3：背景由上向下滚动动画，呈现全景 */
@keyframes heroPanDown {
  0%   { transform: translateY(0); }
  100% { transform: translateY(-25%); }
}
.hero-slides .hero-slide:nth-child(2) .hero-slide-bg img {
  height: 130%;
  animation: heroPanDown 14s ease-in-out infinite alternate;
}
.hero-slides .hero-slide:nth-child(3) .hero-slide-bg img {
  height: 130%;
  animation: heroPanDown 14s ease-in-out infinite alternate;
}
.hero-slide-overlay { position:absolute; inset:0; background:rgba(10,31,59,.45); z-index:1; }
.hero-slide .wrap { position:relative; z-index:2; width:100%; height:100%; display:flex; align-items:center; }
.hero-text { max-width:720px; color:#fff; transform:translateY(20px); opacity:0; transition: transform .8s ease .2s, opacity .8s ease .2s; }
.hero-slide.active .hero-text { transform:translateY(0); opacity:1; }
.hero-eyebrow { display:inline-block; font-size:13px; font-weight:600; letter-spacing:1.5px; text-transform:uppercase; color:var(--bh-teal); margin-bottom:14px; }
.hero-text h1 { font-size:48px; font-weight:700; line-height:1.12; letter-spacing:-.5px; margin-bottom:16px; color:#fff; }
.hero-text h1 em { font-style:normal; color:var(--bh-teal); }
.hero-text h2 { font-size:17px; font-weight:400; color:rgba(255,255,255,.8); line-height:1.65; margin-bottom:32px; }
.hero-cta { display:inline-flex; align-items:center; gap:8px; font-size:15px; font-weight:600; color:#fff; padding:12px 0; border-bottom:2px solid var(--bh-teal); }
.hero-cta:hover { color:var(--bh-teal); }
.hero-cta-icon { width:15px; height:15px; }

/* 轮播点指示器 */
.hero-dots { position:absolute; bottom:32px; left:50%; transform:translateX(-50%); z-index:5; display:flex; gap:10px; }
.hero-dots span { width:38px; height:4px; background:rgba(255,255,255,.3); cursor:pointer; transition:background .3s; }
.hero-dots span.active { background:var(--bh-teal); }

/* 左右箭头 */
.hero-arrows { position:absolute; inset:0; z-index:5; display:flex; align-items:center; justify-content:space-between; pointer-events:none; }
.hero-arrows span { pointer-events:auto; width:44px; height:44px; display:flex; align-items:center; justify-content:center; font-size:28px; color:rgba(255,255,255,.7); cursor:pointer; transition:color .2s, background .2s; border-radius:50%; margin:0 20px; background:rgba(0,0,0,.15); }
.hero-arrows span:hover { color:#fff; background:rgba(0,0,0,.35); }
.hero-arrows .prev { font-weight:300; }
.hero-arrows .next { font-weight:300; }

/* ===========================
   厂区航拍轮播 (嵌于侧栏列内)
   =========================== */
.bh-aerial-carousel { position:relative; width:100%; overflow:hidden; border-radius:8px; background:#1a1a2e; }
.bh-aerial-slides { position:relative; width:100%; aspect-ratio:4/3; }
.bh-aerial-slide { position:absolute; inset:0; opacity:0; transition:opacity 1s ease; z-index:1; }
.bh-aerial-slide.active { opacity:1; z-index:2; }
.bh-aerial-slide img { width:100%; height:100%; object-fit:cover; display:block; }
.bh-aerial-dots { position:absolute; bottom:14px; left:50%; transform:translateX(-50%); z-index:5; display:flex; gap:8px; }
.bh-aerial-dots span { width:8px; height:8px; border-radius:50%; background:rgba(255,255,255,.35); cursor:pointer; transition:background .3s, transform .3s; }
.bh-aerial-dots span.active { background:var(--bh-teal); transform:scale(1.3); }
.bh-aerial-arrows { position:absolute; inset:0; z-index:5; display:flex; align-items:center; justify-content:space-between; pointer-events:none; }
.bh-aerial-arrows span { pointer-events:auto; width:32px; height:32px; display:flex; align-items:center; justify-content:center; font-size:20px; color:rgba(255,255,255,.8); cursor:pointer; transition:color .2s, background .2s; border-radius:50%; margin:0 12px; background:rgba(0,0,0,.2); }
.bh-aerial-arrows span:hover { color:#fff; background:rgba(0,0,0,.4); }

/* ===========================
   HR 分隔线
   =========================== */
.bh-hr { height:1px; background:var(--bh-line); border:none; margin:0; }

/* ===========================
   通用 Section
   =========================== */
.bh-section { padding:80px 0; }
.bh-section--gray { background:var(--bh-bg); }
.bh-section--navy { background:var(--bh-navy); }
.bh-eyebrow { font-size:13px; font-weight:600; letter-spacing:1.5px; text-transform:uppercase; color:var(--bh-teal); margin-bottom:10px; }
.bh-heading { font-size:38px; font-weight:700; color:var(--bh-navy); line-height:1.18; letter-spacing:-.3px; margin-bottom:16px; }
/* 强制单行标题：不折行；窄屏的字号缩放与折行处理见 mobile.css */
.bh-heading--single { max-width:none; white-space:nowrap; }
.bh-section--navy .bh-heading { color:#fff; }
.bh-section-subtitle { font-size:16px; color:var(--bh-text-2); line-height:1.7; max-width:760px; margin:0; }
.bh-desc { font-size:16px; color:var(--bh-text-2); line-height:1.7; margin-bottom:0; }
.bh-section-header { margin-bottom:56px; }
.bh-section-header--center { text-align:center; }
.bh-section-header--center .bh-desc { margin-left:auto; margin-right:auto; }
.bh-section-head { text-align:center; margin-bottom:56px; }
.bh-section-eyebrow { font-size:13px; font-weight:600; letter-spacing:1.5px; color:var(--bh-teal); margin-bottom:10px; text-transform:uppercase; }
.bh-section-title { font-size:38px; font-weight:700; color:var(--bh-navy); line-height:1.18; letter-spacing:-.3px; margin-bottom:0; }

/* ===========================
   2-Col Section (BH twocol)
   =========================== */
.bh-twocol { display:grid; grid-template-columns:1fr 1fr; gap:64px; align-items:stretch; }
.bh-twocol-media video,
.bh-twocol-media img:not(.bh-aerial-slide img) { width:100%; aspect-ratio:16/10; object-fit:cover; border-radius:8px; }
.bh-twocol-media .bh-aerial-carousel { aspect-ratio:auto; }
.bh-twocol-text p { font-size:15px; color:var(--bh-text-2); line-height:1.75; margin-bottom:18px; }

/* CTA 按钮类型（仿 BH） */
.bh-cta { display:inline-flex; align-items:center; gap:6px; font-size:15px; font-weight:600; color:var(--bh-teal); padding:4px 0; }
.bh-cta:hover { color:var(--bh-teal-dark); }
.bh-cta .bh-cta-icon { width:14px; height:14px; transition:transform .2s; }
.bh-cta:hover .bh-cta-icon { transform:translateX(3px); }
.bh-cta--external:hover .bh-cta-icon { transform:translate(2px,-2px); }

/* ===========================
   数字统计 (白底简约细线)
   =========================== */
.bh-stats { background:var(--bh-white); padding:56px 0; border-top:1px solid var(--bh-line); border-bottom:1px solid var(--bh-line); }
.bh-stats-row { display:grid; grid-template-columns:repeat(4,1fr); position:relative; }
.bh-stat { text-align:center; padding:0 24px; position:relative; }
.bh-stat:not(:last-child)::after { content:""; position:absolute; right:0; top:12%; height:76%; width:1px; background:var(--bh-line); }
.bh-stat .bh-stat-num { display:block; font-size:42px; font-weight:700; color:var(--bh-navy); line-height:1; margin-bottom:8px; letter-spacing:-.5px; }
.bh-stat-num i { font-style:normal; color:var(--bh-teal); font-weight:400; }
.bh-stat-label { display:block; color:var(--bh-text-2); font-size:13px; letter-spacing:.3px; }

/* ===========================
   Interactive Image Card (BH 3-col)
   =========================== */
.bh-cards-3 { display:grid; grid-template-columns:repeat(3,1fr); gap:32px; }
.bh-card { position:relative; border-radius:8px; overflow:hidden; aspect-ratio:3/4; display:block; cursor:pointer; }
.bh-card img { width:100%; height:100%; object-fit:cover; transition:transform .5s; }
.bh-card:hover img { transform:scale(1.05); }
.bh-card-content { position:absolute; inset:auto 0 0 0; padding:28px 24px; background:linear-gradient(transparent, rgba(10,31,59,.85)); color:#fff; }
.bh-card-title { font-size:17px; font-weight:600; margin-bottom:8px; line-height:1.35; }
.bh-card-desc { font-size:13px; color:rgba(255,255,255,.7); margin-bottom:16px; line-height:1.5; }

/* ===========================
   Product Spotlight Carousel
   =========================== */
.bh-spotlight { position:relative; border-radius:8px; overflow:hidden; background:var(--bh-teal); padding:60px 60px; }
.bh-spotlight-content { color:#fff; max-width:580px; }
.bh-spotlight-content h5 { font-size:13px; font-weight:600; letter-spacing:1.5px; text-transform:uppercase; opacity:.75; margin-bottom:12px; }
.bh-spotlight-content h3 { font-size:28px; font-weight:700; line-height:1.2; margin-bottom:14px; }
.bh-spotlight-content p { font-size:15px; opacity:.85; line-height:1.65; margin-bottom:24px; }

/* ===========================
   Capability / 能力区块
   =========================== */
.bh-cap-block { display:grid; grid-template-columns:1fr 1fr; gap:56px; align-items:center; }
.bh-cap-block-img img,
.bh-cap-block-img video { width:100%; aspect-ratio:4/3; object-fit:cover; border-radius:8px; }
.bh-cap-block-text .en { font-size:12px; font-weight:600; letter-spacing:1.5px; text-transform:uppercase; color:var(--bh-teal); }
.bh-cap-block-text h3 { font-size:26px; font-weight:700; color:var(--bh-navy); margin:6px 0 18px; }
.bh-cap-block-text ul li { position:relative; padding:9px 0 9px 20px; border-bottom:1px solid var(--bh-line); font-size:14px; color:var(--bh-text-2); }
.bh-cap-block-text ul li:last-child { border-bottom:none; }
.bh-cap-block-text ul li::before { content:"▸"; position:absolute; left:0; color:var(--bh-teal); }

/* ---- 阶梯式手风琴（逐级缩进，点击展开对应介绍） ---- */
.bh-stair { display:flex; flex-direction:column; gap:10px; }
.bh-stair-item { margin-left:0; }
.bh-stair-head { display:flex; align-items:center; gap:18px; width:100%; text-align:left; padding:15px 22px; background:var(--bh-white); border:1px solid var(--bh-line); border-radius:8px; transition:border-color .3s, transform .3s, box-shadow .3s; }
.bh-stair-item:hover .bh-stair-head { border-color:var(--bh-teal); transform:translateX(6px); }
.bh-stair-item.open .bh-stair-head { border-color:var(--bh-teal); box-shadow:0 6px 20px rgba(2,167,131,.12); }
.bh-stair-idx { flex:0 0 34px; width:34px; height:34px; border-radius:50%; display:flex; align-items:center; justify-content:center; background:var(--bh-bg); border:1px solid var(--bh-line); color:var(--bh-text-2); font-size:13px; font-weight:600; transition:all .3s; }
.bh-stair-item.open .bh-stair-idx { background:var(--bh-teal); border-color:var(--bh-teal); color:#fff; }
.bh-stair-name { font-size:17px; font-weight:600; color:var(--bh-navy); }
.bh-stair-metric { margin-left:auto; font-size:14px; font-weight:600; color:var(--bh-teal); white-space:nowrap; letter-spacing:.2px; }
.bh-stair-panel { display:grid; grid-template-rows:0fr; transition:grid-template-rows .45s cubic-bezier(.2,.7,.3,1); }
.bh-stair-item.open .bh-stair-panel { grid-template-rows:1fr; }
.bh-stair-clip { overflow:hidden; min-height:0; }
.bh-stair-body { display:grid; grid-template-columns:340px 1fr; gap:34px; padding:24px 0 10px; }
.bh-stair-media { position:relative; overflow:hidden; border-radius:8px; height:auto; background:var(--bh-bg); padding:6px; }
.bh-stair-slides { display:grid; grid-template-columns:repeat(2, 1fr); grid-auto-rows:150px; gap:8px; }
.bh-stair-slides img { width:100%; height:100%; object-fit:contain; border-radius:6px; display:block; background:var(--bh-bg); }
.bh-stair-slides img:hover { box-shadow:0 0 0 2px var(--bh-teal) inset; }
.bh-stair-slides:has(img:only-child) { grid-auto-rows:auto; }
.bh-stair-slides img:only-child { grid-column:1 / -1; max-height:380px; width:auto; max-width:100%; height:auto; margin:0 auto; }
.bh-stair-nav, .bh-stair-dots { display:none; }
.bh-stair-text .en { font-size:12px; font-weight:600; letter-spacing:1.5px; text-transform:uppercase; color:var(--bh-teal); }
.bh-stair-text h4 { font-size:20px; font-weight:700; color:var(--bh-navy); margin:4px 0 12px; }
.bh-stair-text p { font-size:14px; line-height:1.8; color:var(--bh-text-2); }
.bh-stair-tags { display:flex; flex-wrap:wrap; gap:8px; margin-top:16px; }
.bh-stair-tag { font-size:12px; font-weight:600; color:var(--bh-teal-dark); background:rgba(2,167,131,.10); padding:5px 12px; border-radius:999px; }
/* ---- 规格清单（机加工车间：只列设备 / 数量 / 规格，不写描述） ---- */
.bh-spec-list { display:flex; flex-direction:column; margin-top:4px; }
.bh-spec-list li { display:flex; align-items:center; gap:14px; padding:12px 0; border-bottom:1px solid var(--bh-line); }
.bh-spec-list li:last-child { border-bottom:none; }
.bh-spec-list .nm { font-size:15px; font-weight:600; color:var(--bh-navy); margin-right:auto; }
.bh-spec-list .qty { font-size:13px; font-weight:600; color:var(--bh-teal-dark); background:rgba(2,167,131,.10); padding:3px 11px; border-radius:999px; white-space:nowrap; }
.bh-spec-list .size { font-size:18px; font-weight:700; color:var(--bh-navy); letter-spacing:.2px; white-space:nowrap; font-variant-numeric:tabular-nums; }
@media (min-width:993px) {
.bh-stair-item:nth-child(2) { margin-left:34px; }
.bh-stair-item:nth-child(3) { margin-left:68px; }
.bh-stair-item:nth-child(4) { margin-left:102px; }
.bh-stair-item:nth-child(5) { margin-left:136px; }
.bh-stair-item:nth-child(6) { margin-left:170px; }
.bh-stair-item:nth-child(7) { margin-left:204px; }
.bh-stair-item:nth-child(8) { margin-left:204px; }
.bh-stair-item:nth-child(9) { margin-left:204px; }
}
/* ---- 机械加工车间：图片区加宽，设备图更直观 ---- */
#machining .bh-stair-body { grid-template-columns:clamp(280px, 38%, 420px) 1fr; }
#machining .bh-stair-slides { grid-auto-rows:clamp(140px, 15vw, 186px); }
#machining .bh-stair-slides:has(img:only-child) { grid-auto-rows:auto; }
#machining .bh-stair-slides img:only-child { width:100%; height:auto; max-height:320px; }
/* ---- 能力分组容器：父标题套住所有子项 ---- */
.bh-cap-group { padding:42px 46px 46px; background:var(--bh-bg); border:1px solid var(--bh-line); border-radius:12px; }
.bh-cap-group-head { padding-bottom:24px; margin-bottom:30px; border-bottom:1px solid var(--bh-line); }
.bh-cap-group-title { font-size:32px; font-weight:700; color:var(--bh-navy); line-height:1.2; letter-spacing:-.3px; }
.bh-cap-group-desc { font-size:15px; color:var(--bh-text-2); line-height:1.7; margin-top:12px; max-width:760px; }
/* 灰底区块内反转为白底，保证容器与背景有对比 */
.bh-section--gray .bh-cap-group { background:var(--bh-white); }
.bh-section--gray .bh-stair-head { background:var(--bh-bg); }

/* ---- 三大模块：一级卡片网格（一排三个） ---- */
.bh-modules { display:grid; grid-template-columns:repeat(3,1fr); gap:20px; }
.bh-module { display:flex; flex-direction:column; align-items:flex-start; gap:16px; padding:0 0 22px; text-align:left; background:var(--bh-white); border:1px solid var(--bh-line); border-radius:10px; overflow:hidden; transition:border-color .3s, transform .3s, box-shadow .3s; }
.bh-module:hover { border-color:var(--bh-teal); transform:translateY(-4px); box-shadow:0 14px 30px rgba(10,31,59,.10); }
.bh-module.on { border-color:var(--bh-teal); box-shadow:0 0 0 2px rgba(2,167,131,.18); }
.bh-module-media { display:block; width:100%; aspect-ratio:16/9; overflow:hidden; background:var(--bh-bg); }
.bh-module-media img { width:100%; height:100%; object-fit:cover; transition:transform .5s; }
.bh-module:hover .bh-module-media img { transform:scale(1.05); }
.bh-module-body { display:flex; flex-direction:column; gap:6px; padding:0 24px; }
.bh-module-en { font-size:11px; font-weight:600; letter-spacing:1.4px; text-transform:uppercase; color:var(--bh-teal); }
.bh-module-name { font-size:19px; font-weight:700; color:var(--bh-navy); line-height:1.3; }
.bh-module-desc { font-size:13px; color:var(--bh-text-2); line-height:1.7; }
.bh-module-tags { display:flex; flex-wrap:wrap; gap:8px; margin-top:4px; }
.bh-module-tags em { font-style:normal; font-size:12px; font-weight:600; color:var(--bh-teal-dark); background:rgba(2,167,131,.10); padding:4px 11px; border-radius:999px; }
.bh-module-cta { display:inline-flex; align-items:center; gap:6px; margin:0 24px; font-size:13px; font-weight:600; color:var(--bh-teal); }
.bh-module-cta i { font-style:normal; transition:transform .3s; }
.bh-module:hover .bh-module-cta i { transform:translateX(4px); }
.bh-module.on .bh-module-cta { color:var(--bh-text-2); }

/* ---- 二级：车间详情面板 ---- */
.bh-module-panels { margin-top:0; }
.bh-module-panel { display:none; }
.bh-module-panel.open { display:block; animation:bhPanelIn .35s ease; }
@keyframes bhPanelIn { from { opacity:0; transform:translateY(10px); } to { opacity:1; transform:none; } }
.bh-module-panel-head { display:flex; align-items:flex-end; justify-content:space-between; gap:20px; padding-bottom:20px; margin-bottom:26px; border-bottom:1px solid var(--bh-line); }
.bh-module-title { font-size:24px; font-weight:700; color:var(--bh-navy); line-height:1.25; }
.bh-module-close { flex-shrink:0; font-size:13px; font-weight:600; color:var(--bh-text-2); background:var(--bh-bg); border:1px solid var(--bh-line); padding:7px 14px; border-radius:6px; white-space:nowrap; transition:color .25s, border-color .25s; }
.bh-module-close:hover { color:var(--bh-teal); border-color:var(--bh-teal); }

/* ---- 通体深色带（同导航栏深色底 #22262d，左右铺满整屏） ---- */
.bh-section--dark { background:#22262d; }
.bh-section--dark .bh-cap-group-head { border-bottom-color:rgba(255,255,255,.10); }
.bh-section--dark .bh-cap-group-title { color:#fff; }
.bh-section--dark .bh-cap-group-desc { color:rgba(255,255,255,.62); }
.bh-section--dark .bh-module { background:rgba(255,255,255,.045); border-color:rgba(255,255,255,.10); }
.bh-section--dark .bh-module:hover { border-color:var(--bh-teal); box-shadow:0 14px 30px rgba(0,0,0,.35); }
.bh-section--dark .bh-module.on { border-color:var(--bh-teal); box-shadow:0 0 0 2px rgba(2,167,131,.30); }
.bh-section--dark .bh-module-media { background:rgba(0,0,0,.30); }
.bh-section--dark .bh-module-name { color:#fff; }
.bh-section--dark .bh-module-desc { color:rgba(255,255,255,.62); }
.bh-section--dark .bh-module-tags em { color:#4fd6b4; background:rgba(2,167,131,.18); }
.bh-section--dark .bh-module.on .bh-module-cta { color:rgba(255,255,255,.66); }

/* ---- 车间详情区：默认隐藏，选中模块后展开（浅色风格） ---- */
.bh-detail-section { display:none; }
.bh-detail-section.open { display:block; }

/* ===========================
   横向滚动图集
   =========================== */
.hscroll-section { margin:40px 0 0; }
.hscroll-wrap { position:relative; padding:0 40px; }
.hscroll { display:flex; gap:16px; overflow-x:auto; scroll-snap-type:x proximity; padding:4px 2px 16px; scrollbar-width:none; }
.hscroll::-webkit-scrollbar { display:none; }
.hitem { flex:0 0 280px; scroll-snap-align:start; background:#fff; border-radius:8px; overflow:hidden; box-shadow:0 2px 12px rgba(10,31,59,.06); }
.hitem img { width:100%; aspect-ratio:4/3; object-fit:cover; }
.hitem figcaption { padding:12px 14px; font-size:13px; color:var(--bh-text-2); white-space:nowrap; overflow:hidden; text-overflow:ellipsis; }
.hbtn { position:absolute; top:42%; transform:translateY(-50%); z-index:5; width:40px; height:40px; border-radius:50%; background:var(--bh-navy); color:#fff; font-size:18px; cursor:pointer; opacity:.9; }
.hbtn:hover { background:var(--bh-teal); }
.hbtn.hl { left:0; }
.hbtn.hr { right:0; }

/* ===========================
   证书/资质网格
   =========================== */
.bh-cert-grid { display:grid; grid-template-columns:repeat(6,1fr); gap:18px; }
.bh-cert-cell { background:#fff; border-radius:6px; overflow:hidden; box-shadow:0 4px 16px rgba(43,55,104,.08); transition:all .35s; }
.bh-cert-cell:hover { transform:translateY(-6px); box-shadow:0 10px 30px rgba(13,59,102,.12); }
.bh-cert-cell img { width:100%; height:auto; display:block; object-fit:contain; }
.bh-cert-cell.wide { grid-column:span 2; }
.bh-cert-cell .cap { padding:10px 12px; font-size:13px; color:var(--bh-text); text-align:center; }

/* ===========================
   CTA Banner
   =========================== */
.bh-cta-banner { background:var(--bh-navy); padding:64px 0; color:#fff; }
.bh-cta-banner .wrap { display:flex; align-items:center; justify-content:space-between; flex-wrap:wrap; gap:28px; }
.bh-cta-banner h3 { font-size:28px; font-weight:700; }

/* 首页：CTA 条＝收尾深色章节的第一行，收窄留白 */
.page-home .bh-cta-banner { padding:56px 0; }
.page-home .bh-cta-banner h3 { position:relative; padding-left:22px; font-size:26px; }
.page-home .bh-cta-banner h3::before { content:""; position:absolute; left:0; top:.2em; bottom:.2em; width:3px; border-radius:2px; background:var(--bh-teal); }

/* ===========================
   客户 Logo 墙
   首页三块浅色按 #f7f9fc → #eef2f7 → #e6ecf3 逐级加深，避免色块突跳
   =========================== */
.bh-partners { background:#e6ecf3; }
.bh-partners .bh-logo-cell { border-color:#dbe3ec; }
.bh-logo-grid { display:grid; grid-template-columns:repeat(6,1fr); gap:18px; }
.bh-logo-cell { background:#fff; border:1px solid var(--bh-line); border-radius:6px; height:80px; display:flex; align-items:center; justify-content:center; padding:14px; transition:all .3s; }
.bh-logo-cell:hover { border-color:var(--bh-teal); box-shadow:0 4px 16px rgba(10,31,59,.08); }
.bh-logo-cell img { max-height:44px; max-width:100%; object-fit:contain; }

/* ===========================
   内页 Hero
   =========================== */
.bh-page-hero { background:var(--bh-navy); padding:80px 0 70px; color:#fff; }
.bh-page-hero h1 { font-size:42px; font-weight:700; margin-bottom:10px; }
.bh-page-hero-crumb { font-size:13px; color:rgba(255,255,255,.4); }
.bh-page-hero-crumb a:hover { color:#fff; }

/* ---- 内页 Hero：三大车间主图背景轮播 ---- */
.bh-page-hero--carousel { position:relative; overflow:hidden; background:var(--bh-navy); padding:0; min-height:480px; height:62vh; display:flex; align-items:center; }
.bh-page-hero--carousel > .wrap { position:relative; z-index:2; width:100%; }
.bh-page-hero--carousel h1 { font-size:54px; font-weight:800; line-height:1.1; letter-spacing:-1px; margin-bottom:18px; }
.bh-page-hero--carousel .hero-eyebrow { font-size:13px; font-weight:600; letter-spacing:2px; text-transform:uppercase; color:var(--bh-teal); display:inline-block; margin-bottom:16px; }
.bh-page-hero--carousel .bh-page-hero-crumb { font-size:13px; color:rgba(255,255,255,.4); }
.bh-page-hero--carousel .bh-page-hero-crumb a { color:rgba(255,255,255,.55); transition:color .2s; }
.bh-page-hero--carousel .bh-page-hero-crumb a:hover { color:var(--bh-teal); }
.bh-page-hero--carousel::after { content:""; position:absolute; inset:0; z-index:1; pointer-events:none; background:linear-gradient(120deg, rgba(10,31,59,.92) 0%, rgba(10,31,59,.78) 45%, rgba(10,31,59,.55) 100%); }
.bh-page-hero-bg { position:absolute; inset:0; z-index:0; pointer-events:none; }
.bh-page-hero-bg-slide { position:absolute; inset:0; background-size:cover; background-position:center 60%; opacity:0; transition:opacity 1.4s ease; }
.bh-page-hero-bg-slide.active { opacity:1; }

/* ===========================
   详情/文章区域
   =========================== */
.bh-detail { background:#fff; border-radius:8px; padding:48px 52px; }
.bh-detail h1 { font-size:30px; font-weight:700; color:var(--bh-navy); margin-bottom:6px; }
.bh-detail .bh-subtitle { font-size:13px; color:var(--bh-text-2); margin-bottom:24px; }
.bh-detail .content p { margin-bottom:14px; line-height:1.8; color:var(--bh-text-2); }
.bh-detail .content h4 { font-size:17px; font-weight:600; color:var(--bh-navy); margin:28px 0 10px; }
.bh-detail .content ul { margin-bottom:18px; }
.bh-detail .content ul li { position:relative; padding-left:18px; margin-bottom:6px; color:var(--bh-text-2); font-size:14px; }
.bh-detail .content ul li::before { content:"▪"; position:absolute; left:2px; color:var(--bh-teal); }

/* ===========================
   材质卡片网格
   =========================== */
.bh-mat-grid { display:grid; grid-template-columns:repeat(3,1fr); gap:24px; }
.bh-mat-card { background:var(--bh-bg); border-radius:8px; padding:32px 26px; border-top:3px solid var(--bh-teal); transition:all .35s; }
.bh-mat-card:hover { transform:translateY(-4px); box-shadow:0 12px 32px rgba(10,31,59,.1); background:#fff; }
.bh-mat-card h4 { font-size:19px; font-weight:600; color:var(--bh-navy); margin-bottom:8px; }
.bh-mat-card p { font-size:14px; color:var(--bh-text-2); }

/* ===========================
   电联信息
   =========================== */
.bh-contact-card { background:var(--bh-bg); border-radius:8px; padding:28px; margin-bottom:18px; display:flex; gap:16px; align-items:flex-start; }
.bh-contact-card .ico { width:44px; height:44px; border-radius:8px; background:var(--bh-navy); display:flex; align-items:center; justify-content:center; flex-shrink:0; }
.bh-contact-card .ico svg { width:20px; height:20px; }
.bh-contact-card h4 { font-size:15px; font-weight:600; color:var(--bh-navy); margin-bottom:4px; }
.bh-contact-card p { font-size:14px; color:var(--bh-text-2); }

/* ===========================
   返回顶部
   =========================== */
.bh-back-top { position:fixed; right:28px; bottom:36px; z-index:90; width:44px; height:44px; border-radius:8px; background:var(--bh-navy); color:#fff; font-size:18px; opacity:0; pointer-events:none; transition:all .3s; }
.bh-back-top.show { opacity:1; pointer-events:auto; }
.bh-back-top:hover { background:var(--bh-teal); transform:translateY(-2px); }

/* 浮动语言切换：与返回顶部同款方形按钮，内显 CH / EN，当前语言高亮 */
.bh-lang-btn {
  position:fixed; right:84px; bottom:36px; z-index:90;
  width:44px; height:44px; border-radius:8px;
  display:flex; flex-direction:column; align-items:center; justify-content:center; gap:1px;
  background:var(--bh-navy); color:#fff;
  font-size:11px; font-weight:700; line-height:1.1; letter-spacing:.5px;
  opacity:0; pointer-events:none; transition:all .3s;
}
.bh-lang-btn.show { opacity:1; pointer-events:auto; }
.bh-lang-btn-item { color:rgba(255,255,255,.42); }
.bh-lang-btn-item.is-on { color:#fff; }
.bh-lang-btn:hover { background:var(--bh-teal); transform:translateY(-2px); }
.bh-lang-btn:hover .bh-lang-btn-item { color:rgba(255,255,255,.7); }
.bh-lang-btn:hover .bh-lang-btn-item.is-on { color:#fff; }

/* ===========================
   页脚
   =========================== */
.bh-footer { background:var(--bh-navy-dark); color:rgba(255,255,255,.45); padding:52px 0 0; font-size:14px; }
.bh-footer-cols { display:grid; grid-template-columns:1.9fr .98fr 1.5fr 1.34fr; gap:0 30px; padding-bottom:48px; }
.bh-footer-col { padding-left:30px; border-left:1px solid rgba(255,255,255,.09); }
.bh-footer-col:first-child { padding-left:0; border-left:none; }
.bh-footer h4 { color:#fff; font-size:15px; font-weight:600; margin-bottom:14px; letter-spacing:.3px; }
.bh-footer p { font-size:14px; line-height:1.85; color:rgba(255,255,255,.45); }
/* 简介栏：小图片与四行简介并排，图片贴左侧 */
.bh-footer-intro-body { display:flex; gap:16px; align-items:flex-start; }
.bh-footer-intro-body img { width:150px; height:86px; object-fit:cover; object-position:center 45%; border-radius:4px; flex-shrink:0; }
.bh-footer-intro-body p { flex:1; min-width:0; }
.bh-footer a:hover { color:var(--bh-teal); }
.bh-footer li { margin-bottom:9px; }
.bh-footer li:last-child { margin-bottom:0; }
.bh-footer-link { display:inline-flex; align-items:center; gap:5px; margin-top:14px; font-size:14px; font-weight:600; color:var(--bh-teal); }
.bh-footer-link:hover { color:#31d2aa; }
.bh-footer-link-icon { width:11px; height:11px; transition:transform .2s; }
.bh-footer-link:hover .bh-footer-link-icon { transform:translate(2px,-2px); }
.bh-copyright { border-top:1px solid rgba(255,255,255,.06); text-align:center; padding:18px 0; font-size:12px; color:rgba(255,255,255,.25); }

/* ===========================
   滚动渐入
   =========================== */
.reveal { opacity:0; transform:translateY(28px); transition:opacity .65s ease, transform .65s ease; }
.reveal.in { opacity:1; transform:none; }
.reveal.d1 { transition-delay:.1s; }
.reveal.d2 { transition-delay:.2s; }
.reveal.d3 { transition-delay:.3s; }

/* ===========================
   核电分省业绩（简约文字列表）
   =========================== */
.nuc-list { padding-top: 4px; }
.nuc-list-item { display:flex; gap:16px; align-items:flex-start; padding:20px 0; border-bottom:1px solid var(--bh-line); }
.nuc-list-item:last-child { border-bottom:none; }
.nuc-list-dot { width:10px; height:10px; border-radius:50%; background:var(--bh-teal); flex-shrink:0; margin-top:7px; box-shadow:0 0 0 4px rgba(2,167,131,.15); }
.nuc-list-body h4 { font-size:16px; font-weight:700; color:var(--bh-navy); margin-bottom:6px; line-height:1.35; }
.nuc-list-body p { font-size:13px; color:var(--bh-text-2); line-height:1.65; }

/* ===========================
   竖向导航 + Featured (BH 内页通用布局)
   =========================== */
.bh-vert-layout {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 0;
  background: #f3f5f8;
  border-radius: 10px;
  border-left: 4px solid var(--bh-teal);
  box-shadow: 0 2px 16px rgba(10,31,59,.05);
  overflow: hidden;
}
.bh-vert-menu {
  background: #f3f5f8;
  padding: 28px 0;
  border-right: 1px solid var(--bh-line);
  display: flex;
  flex-direction: column;
}
.bh-vert-menu .bh-vert-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--bh-navy);
  margin-bottom: 14px;
  letter-spacing: 0;
  padding: 0 24px;
  flex-shrink: 0;
}
.bh-vert-menu ul {
  list-style: none;
  margin: 0; padding: 0;
  flex: 1;
  display: flex;
  flex-direction: column;
}
.bh-vert-menu li {
  position: relative;
  flex: 1 1 0;
  min-height: 0;
  display: flex;
  align-items: stretch;
}
.bh-vert-menu li:not(:last-child)::after {
  content: "";
  position: absolute;
  bottom: 0; left: 24px; right: 24px;
  height: 1px;
  background: var(--bh-line);
}
.bh-vert-menu a {
  display: flex;
  align-items: center;
  flex: 1;
  padding: 0 24px;
  font-size: 15px;
  font-weight: 500;
  color: var(--bh-text-2);
  transition: color .2s, background .2s;
  letter-spacing: .2px;
}
.bh-vert-menu a:hover {
  color: var(--bh-navy);
  background: rgba(2,167,131,.04);
}
.bh-vert-menu a.active {
  color: var(--bh-navy);
  font-weight: 700;
  background: rgba(2,167,131,.07);
}
.bh-vert-menu a.active::before {
  content: "";
  position: absolute;
  left: 0; top: 0;
  width: 4px; height: 100%;
  background: var(--bh-teal);
  border-radius: 0;
  transform: none;
}

/* 右侧内容区（白色） */
#capPanel {
  background: #fff;
  padding: 32px 36px;
}

.bh-vert-intro {
  font-size: 15px;
  color: var(--bh-text-2);
  line-height: 1.75;
  margin-bottom: 32px;
}

.bh-vert-featured-head { position: relative; margin-bottom: 20px; }
.bh-vert-featured-head hr { width: 40px; height: 3px; background: var(--bh-teal); border: none; margin: 0 0 12px; }
.bh-vert-featured-head h3 { font-size: 18px; font-weight: 700; color: var(--bh-navy); margin: 0; letter-spacing: -.2px; }

.bh-vert-entry {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 28px;
  align-items: center;
  padding: 24px 0;
  border-bottom: 1px solid var(--bh-line);
}
.bh-vert-entry:last-child { border-bottom: none; }
.bh-vert-entry-img { border-radius: 8px; overflow: hidden; aspect-ratio: 16/10; }
.bh-vert-entry-img img { width: 100%; height: 100%; object-fit: cover; transition: transform .4s; }
.bh-vert-entry:hover .bh-vert-entry-img img { transform: scale(1.03); }
.bh-vert-entry-body h4 { font-size: 17px; font-weight: 700; color: var(--bh-navy); margin-bottom: 8px; line-height: 1.3; letter-spacing: -.2px; }
.bh-vert-entry-body p { font-size: 13px; color: var(--bh-text-2); line-height: 1.7; margin-bottom: 12px; }
.bh-vert-entry-body .bh-cta { font-size: 12px; letter-spacing: .5px; text-transform: uppercase; }

/* 竖向导航 Tab 切换 */
.cap-panel { display: none; animation: fadeIn .4s ease; }
.cap-panel.active { display: block; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }

/* ===========================
   主要材质 (三栏卡片风格)
   仿 Explore more 卡片 · 悬停显示详细牌号
   =========================== */
.bh-material-cards {
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:32px;
  max-width:1200px;
  margin:0 auto;
}

.bh-material-card {
  position:relative;
  border-radius:10px;
  overflow:hidden;
  background:#fff;
  box-shadow:0 4px 20px rgba(10,31,59,.08);
  cursor:pointer;
  transition:transform .4s, box-shadow .4s;
}
.bh-material-card:hover {
  transform:translateY(-6px);
  box-shadow:0 16px 48px rgba(10,31,59,.15);
}

/* 卡片图片区 */
.bh-material-card-img {
  width:100%;
  aspect-ratio:4/3;
  overflow:hidden;
  position:relative;
}
.bh-material-card-img img {
  width:100%;
  height:100%;
  object-fit:cover;
  transition:transform .6s;
}
.bh-material-card:hover .bh-material-card-img img {
  transform:scale(1.06);
}

/* 卡片正面内容（叠加在图片底部） */
.bh-material-card-content {
  position:absolute;
  left:0; right:0; bottom:0;
  padding:24px 22px;
  background:linear-gradient(transparent 0%, rgba(10,31,59,.75) 40%, rgba(10,31,59,.92) 100%);
  color:#fff;
  z-index:2;
  transition:opacity .35s;
}
.bh-material-card:hover .bh-material-card-content {
  opacity:0;
}

.bh-material-card-line {
  width:28px;
  height:3px;
  background:var(--bh-teal);
  border-radius:2px;
  margin-bottom:10px;
  flex-shrink:0;
}
.bh-material-card-title {
  font-size:16px;
  font-weight:700;
  color:#fff;
  line-height:1.3;
  margin-bottom:6px;
  letter-spacing:.3px;
}
.bh-material-card-sub {
  font-size:12px;
  color:rgba(255,255,255,.65);
  font-weight:400;
  letter-spacing:.5px;
}

/* 悬停详情浮层 */
.bh-material-card-hover {
  position:absolute;
  inset:0;
  background:linear-gradient(135deg, var(--bh-navy) 0%, #0d2847 100%);
  color:#fff;
  padding:32px 26px;
  display:flex;
  flex-direction:column;
  justify-content:center;
  opacity:0;
  z-index:3;
  transition:opacity .4s;
  border-radius:10px;
}
.bh-material-card:hover .bh-material-card-hover {
  opacity:1;
}
.bh-material-card-hover h4 {
  font-size:14px;
  font-weight:700;
  color:var(--bh-teal);
  margin-bottom:8px;
  line-height:1.4;
}
.bh-material-card-hover h4:not(:first-of-type) {
  margin-top:4px;
}
.bh-material-card-hover .bh-material-card-grades {
  font-size:13px;
  color:rgba(255,255,255,.8);
  line-height:1.7;
  margin-bottom:8px;
}
.bh-material-card-hover .bh-material-card-line + h4 {
  margin-top:2px;
}

/* ===========================
   数字化生产管理（首页）
   浅灰底上九个界面缩略，点击用灯箱放大
   =========================== */
.digital { background:#eef2f7; padding:52px 0; }
.digital-head {
  display:flex;
  align-items:baseline;
  justify-content:space-between;
  gap:32px;
  margin-bottom:24px;
}
.digital-head .bh-heading { margin-bottom:0; }
.digital-head-desc { font-size:15px; color:var(--bh-text-2); letter-spacing:.3px; }

/* 容器只做网格，不铺底色，直接用版块本身的浅灰 */
.digital-console { position:relative; }

.digital-grid {
  display:grid;
  grid-template-columns:repeat(5,1fr);
  gap:12px;
}

.digital-tile {
  display:flex;
  flex-direction:column;
  gap:8px;
  padding:7px 7px 9px;
  background:#fff;
  border:1px solid #e2e8f0;
  border-radius:4px;
  text-align:left;
  cursor:zoom-in;
  box-shadow:0 1px 2px rgba(10,31,59,.04);
  transition:border-color .25s, transform .25s, box-shadow .25s;
}
.digital-tile:hover {
  border-color:rgba(2,167,131,.85);
  transform:translateY(-2px);
  box-shadow:0 8px 20px rgba(10,31,59,.10);
}
.digital-tile:focus-visible { outline:2px solid var(--bh-teal); outline-offset:2px; }

.digital-tile-shot {
  position:relative;
  display:block;
  aspect-ratio:2.09;
  border:1px solid #edf1f6;
  border-radius:2px;
  overflow:hidden;
  background:#f5f8fb;
}
.digital-tile-shot img { display:block; width:100%; height:100%; object-fit:contain; }
/* 悬停时浮出放大标记，缩略图小也一眼知道能点 */
.digital-tile-shot::after {
  content:"＋";
  position:absolute;
  left:50%; top:50%;
  width:30px; height:30px;
  margin:-15px 0 0 -15px;
  border-radius:50%;
  background:rgba(2,167,131,.88);
  color:#fff;
  font-size:15px;
  line-height:30px;
  text-align:center;
  opacity:0;
  transform:scale(.82);
  transition:opacity .25s, transform .25s;
  pointer-events:none;
}
.digital-tile:hover .digital-tile-shot::after,
.digital-tile:focus-visible .digital-tile-shot::after {
  opacity:1;
  transform:scale(1);
}

/* 03 是竖版手机页：缩略也不用裁切，居中摆进同一格 */
.digital-tile--phone .digital-tile-shot { display:flex; align-items:center; justify-content:center; }
.digital-tile--phone .digital-tile-shot img {
  width:auto;
  height:88%;
  border:1px solid #dfe6ee;
  border-radius:2px;
}

.digital-tile-meta { display:flex; align-items:baseline; gap:7px; min-width:0; }
.digital-tile-num {
  font-family:ui-monospace, Consolas, "Courier New", monospace;
  font-size:11px;
  letter-spacing:1px;
  color:var(--bh-teal);
}
.digital-tile-name {
  font-size:12.5px;
  color:#33445c;
  white-space:nowrap;
  overflow:hidden;
  text-overflow:ellipsis;
}
.digital-tile:hover .digital-tile-name { color:var(--bh-navy); }

.digital-hint {
  display:flex;
  flex-direction:column;
  align-items:center;
  justify-content:center;
  gap:7px;
  padding:10px;
  border:1px dashed #ccd7e4;
  border-radius:4px;
  font-size:12px;
  text-align:center;
  color:#7b8798;
}
.digital-hint-icon { color:var(--bh-teal); }
.digital-hint-sub { font-size:11px; letter-spacing:.5px; color:#a4afbe; }

/* 灯箱说明：只有带 data 描述的图才显示，其余页面灯箱保持不变 */
.lb-stage { flex-direction:column; }
.lb-caption {
  display:none;
  margin:14px auto 0;
  max-width:min(88vw,760px);
  font-size:13px;
  line-height:1.7;
  text-align:center;
  color:rgba(255,255,255,.6);
}
.lb-caption.on { display:block; }
.lb-stage.has-caption img { max-height:74vh; }
/* 截图原图 820px 宽，放大时不越过原始尺寸，避免发虚 */
.lb-stage.is-digital img { max-width:min(90vw, 860px); max-height:74vh; }

/* ===========================
   产品图集
   =========================== */
.bh-section[id], .prod-model[id], .prod-panel[id] { scroll-margin-top:90px; }
/* 制造能力页：锚点定位时避开吸顶导航 */
.bh-module-panel[id], .bh-stair-item[id] { scroll-margin-top:96px; }

/* 产品详情页：只显示当前选中的分类（分类由顶部「产品」下拉切换） */
.prod-layout { background:#fff; border-radius:10px; overflow:hidden; box-shadow:0 2px 16px rgba(10,31,59,.07); }

.prod-content { padding:38px 44px 44px; }
.prod-panel { display:none; }
.prod-panel.active { display:block; animation:fadeIn .35s ease; }
.prod-panel-head { margin-bottom:0; }
.prod-panel-head .bh-heading { font-size:28px; margin-bottom:12px; }
.prod-panel-head .bh-desc { font-size:15px; max-width:760px; }

.prod-model { margin-top:44px; }
.prod-model-head { display:flex; align-items:center; gap:14px; margin-bottom:20px; }
.prod-model-head h3 { font-size:20px; font-weight:700; color:var(--bh-navy); letter-spacing:-.2px; white-space:nowrap; }
.prod-model-head::after { content:""; flex:1; height:1px; background:var(--bh-line); }

.prod-gallery { display:grid; grid-template-columns:repeat(4,1fr); gap:20px; }
.prod-photo { margin:0; display:flex; align-items:center; justify-content:center; aspect-ratio:4/3; padding:10px; border-radius:8px; overflow:hidden; background:var(--bh-bg); box-shadow:0 2px 14px rgba(10,31,59,.07); }
.prod-photo img { max-width:100%; max-height:100%; width:auto; height:auto; object-fit:contain; transition:transform .5s; }
.prod-photo:hover img { transform:scale(1.05); }

/* ============================================================
   视觉增强 · 内页 Hero（全屏背景图）
   ============================================================ */
.bh-page-hero--visual {
  position: relative;
  padding: 0;
  min-height: 480px;
  height: 62vh;
  background-size: cover;
  background-position: center 60%;
  background-attachment: fixed;
  overflow: hidden;
  display: flex;
  align-items: center;
}

.bh-page-hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(10,31,59,.88) 0%, rgba(10,31,59,.65) 40%, rgba(10,31,59,.35) 100%);
  z-index: 1;
}

.bh-page-hero--visual .wrap {
  position: relative;
  z-index: 3;
  width: 100%;
}

.bh-page-hero-text {
  max-width: 720px;
}

.bh-page-hero--visual .hero-eyebrow {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--bh-teal);
  margin-bottom: 16px;
  opacity: 0;
  animation: heroFadeUp .7s ease .2s forwards;
}

.bh-page-hero--visual h1 {
  font-size: 54px;
  font-weight: 800;
  line-height: 1.1;
  color: #fff;
  margin-bottom: 18px;
  letter-spacing: -1px;
  opacity: 0;
  animation: heroFadeUp .7s ease .4s forwards;
}

.bh-page-hero-subtitle {
  font-size: 18px;
  color: rgba(255,255,255,.75);
  line-height: 1.6;
  margin-bottom: 28px;
  opacity: 0;
  animation: heroFadeUp .7s ease .6s forwards;
}

.bh-page-hero--visual .bh-page-hero-crumb {
  font-size: 13px;
  color: rgba(255,255,255,.4);
  opacity: 0;
  animation: heroFadeUp .7s ease .8s forwards;
}

.bh-page-hero--visual .bh-page-hero-crumb a {
  color: rgba(255,255,255,.55);
  transition: color .2s;
}

.bh-page-hero--visual .bh-page-hero-crumb a:hover {
  color: var(--bh-teal);
}

@keyframes heroFadeUp {
  from { opacity: 0; transform: translateY(24px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ---- Hero 浮动粒子 ---- */
.bh-page-hero-particles {
  position: absolute;
  inset: 0;
  z-index: 2;
  pointer-events: none;
  overflow: hidden;
}

.bh-page-hero-particles span {
  position: absolute;
  display: block;
  width: 8px;
  height: 8px;
  background: rgba(66,222,183,.85);
  box-shadow: 0 0 12px 3px rgba(66,222,183,.45);
  border-radius: 50%;
  animation: particleFloat ease-in-out infinite alternate;
}

.bh-page-hero-particles span:nth-child(1) { left: 10%; top: 20%; width: 6px; height: 6px; animation-duration: 7s; animation-delay: 0s; }
.bh-page-hero-particles span:nth-child(2) { left: 25%; top: 70%; width: 9px; height: 9px; animation-duration: 9s; animation-delay: 1.2s; }
.bh-page-hero-particles span:nth-child(3) { left: 45%; top: 30%; width: 5px; height: 5px; animation-duration: 8s; animation-delay: 2.4s; }
.bh-page-hero-particles span:nth-child(4) { left: 65%; top: 60%; width: 7px; height: 7px; animation-duration: 6.5s; animation-delay: .6s; }
.bh-page-hero-particles span:nth-child(5) { left: 80%; top: 25%; width: 6px; height: 6px; animation-duration: 10s; animation-delay: 1.8s; }
.bh-page-hero-particles span:nth-child(6) { left: 90%; top: 75%; width: 8px; height: 8px; animation-duration: 7.5s; animation-delay: 3s; }

@keyframes particleFloat {
  0%   { transform: translate(0, 0) scale(1); opacity: .25; }
  25%  { transform: translate(28px, -60px) scale(1.15); opacity: .95; }
  50%  { transform: translate(-18px, -130px) scale(.9); opacity: .8; }
  75%  { transform: translate(24px, -200px) scale(1.1); opacity: .95; }
  100% { transform: translate(-10px, -280px) scale(.7); opacity: .25; }
}

/* ============================================================
   分类切换过渡动画（纯 CSS transition，简单可靠）
   ============================================================ */
.prod-panel {
  display: none;
}
.prod-panel.active {
  display: block;
  animation: panelSlideIn .45s cubic-bezier(.25,.8,.35,1) both;
}
@keyframes panelSlideIn {
  from { opacity: 0; transform: translateY(16px); }
  to   { opacity: 1; transform: none; }
}

/* ============================================================
   产品图片库 Stagger 入场（纯 CSS :nth-child delay）
   ============================================================ */
.prod-gallery .prod-photo {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity .45s ease, transform .45s ease;
}
.prod-gallery .prod-photo.stagger-in {
  opacity: 1;
  transform: none;
}
/* 每格 transition-delay 按列号递增，形成从左到右的波纹效果 */
.prod-gallery .prod-photo:nth-child(4n+1) { transition-delay: 0s; }
.prod-gallery .prod-photo:nth-child(4n+2) { transition-delay: .08s; }
.prod-gallery .prod-photo:nth-child(4n+3) { transition-delay: .16s; }
.prod-gallery .prod-photo:nth-child(4n+4) { transition-delay: .24s; }
.prod-gallery .prod-photo img {
  cursor: zoom-in;
}

/* ============================================================
   材料中心 · 分类吸顶条 + 标准切换 + 分段照片墙
   ============================================================ */
.mat-tabs {
  position: sticky;
  top: 70px;
  z-index: 90;
  background: var(--bh-white);
  border-bottom: 1px solid var(--bh-line);
  box-shadow: 0 6px 18px rgba(10,31,59,.05);
}
.mat-tabs .wrap.mat-tabs-bar { display: flex; align-items: center; gap: 22px; }
.mat-tabs-scroll {
  display: flex;
  gap: 6px;
  flex: 1 1 auto;
  min-width: 0;
  overflow-x: auto;
  scrollbar-width: none;
}
.mat-tabs-scroll::-webkit-scrollbar { display: none; }
.mat-tab {
  flex: 0 0 auto;
  padding: 15px 16px;
  font-size: 14px;
  font-weight: 600;
  color: #6b7280;
  white-space: nowrap;
  border-bottom: 3px solid transparent;
}
.mat-tab:hover { color: var(--bh-teal); }
.mat-tab.on { color: var(--bh-teal); border-bottom-color: var(--bh-teal); }

/* 标准切换器 */
.mat-std {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
  padding-left: 22px;
  border-left: 1px solid var(--bh-line);
}
.mat-std-label {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 1.6px;
  color: #94a0b2;
  text-transform: uppercase;
}
.mat-std-switch {
  display: inline-flex;
  padding: 3px;
  background: #edf2f7;
  border-radius: 6px;
}
.mat-std-btn {
  padding: 5px 12px;
  border-radius: 4px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .9px;
  line-height: 1.5;
  color: #697586;
  transition: color .2s, background .2s, box-shadow .2s;
}
.mat-std-btn:hover { color: var(--bh-navy); }
.mat-std-btn.is-on {
  background: var(--bh-navy);
  color: #fff;
  box-shadow: 0 2px 6px rgba(10,31,59,.18);
}
.mat-std-btn:focus-visible { outline: 2px solid var(--bh-teal); outline-offset: 2px; }

/* 分段 */
.mat-section { margin-bottom: 64px; }
.mat-section:last-child { margin-bottom: 0; }
.mat-section[id] { scroll-margin-top: 150px; }

.mat-head { display: flex; align-items: center; gap: 16px; margin-bottom: 26px; }
.mat-head-line { width: 4px; height: 40px; border-radius: 2px; background: var(--bh-teal); flex-shrink: 0; }
.mat-head .bh-eyebrow { margin-bottom: 4px; }
.mat-title { font-size: 24px; font-weight: 700; color: var(--bh-navy); line-height: 1.2; }
.mat-head-std {
  margin-left: auto;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 4px 9px;
  border: 1px solid #dfe7ef;
  border-radius: 999px;
  background: #fff;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 1.2px;
  color: #8b96a8;
}
.mat-head-std i { width: 5px; height: 5px; border-radius: 50%; background: var(--bh-teal); }
.mat-head-std b { color: var(--bh-navy); font-size: 10px; letter-spacing: 1.2px; }

/* 照片墙：沿用 .prod-gallery / .prod-photo 网格与灯箱，仅叠加牌号角标 */
.mat-wall .prod-photo { position: relative; }
.mat-std-chip {
  position: absolute;
  top: 10px;
  right: 10px;
  z-index: 2;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  max-width: calc(100% - 20px);
  padding: 3px 7px 3px 6px;
  border-radius: 3px;
  background: rgba(10,31,59,.82);
  color: rgba(255,255,255,.94);
  font-size: 9.5px;
  font-weight: 600;
  letter-spacing: .5px;
  line-height: 1.5;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  backdrop-filter: blur(3px);
}
.mat-std-chip::before {
  content: "";
  width: 4px;
  height: 4px;
  flex: 0 0 auto;
  border-radius: 50%;
  background: var(--bh-teal);
}
.mat-std-chip.is-none { background: rgba(102,63,20,.86); }
.mat-std-chip.is-none::before { background: #f0b24a; }

.mat-cap {
  position: absolute;
  left: 12px;
  bottom: 12px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  /* 统一下限：只有牌号、没有重量的那几张不会缩成一小坨 */
  min-width: 88px;
  max-width: calc(100% - 24px);
  padding: 5px 12px;
  border-radius: 999px;
  background: rgba(2,167,131,.94);
  color: #fff;
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: .2px;
  line-height: 1.3;
  box-shadow: 0 2px 8px rgba(10,31,59,.25);
}
.mat-cap b { font-weight: 700; }
.mat-cap span { font-weight: 400; opacity: .9; }
.mat-cap.is-approx { background: rgba(86,99,117,.94); }

/* ============================================================
   材料标准对照表
   ============================================================ */
.std-section { background: #fff; border-top: 1px solid var(--bh-line); }
.std-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 32px;
  margin-bottom: 24px;
}
.std-head .bh-heading { margin-bottom: 10px; }
.std-head .bh-section-subtitle { max-width: 720px; }
.std-head-badge {
  flex: 0 0 auto;
  min-width: 132px;
  padding: 12px 16px;
  border: 1px solid var(--bh-line);
  border-radius: 6px;
  background: #f7f9fc;
}
.std-head-badge span {
  display: block;
  font-size: 9.5px;
  font-weight: 700;
  letter-spacing: 1.4px;
  color: #94a0b2;
  text-transform: uppercase;
}
.std-head-badge b {
  display: block;
  margin-top: 2px;
  font-size: 20px;
  line-height: 1.2;
  letter-spacing: .4px;
  color: var(--bh-navy);
}
.std-head-badge small { display: block; margin-top: 1px; font-size: 10.5px; color: #7b8798; }

.std-scroll-hint { display: none; margin-bottom: 8px; font-size: 11px; letter-spacing: .4px; color: #94a0b2; }

.std-table-wrap {
  overflow-x: auto;
  border: 1px solid var(--bh-line);
  border-radius: 8px;
  background: #fff;
  -webkit-overflow-scrolling: touch;
}
.std-table-wrap:focus-visible { outline: 2px solid var(--bh-teal); outline-offset: 2px; }
.std-table {
  width: 100%;
  min-width: 760px;
  border-collapse: collapse;
  font-size: 13px;
  font-variant-numeric: tabular-nums;
}
.std-table thead th {
  padding: 0;
  background: var(--bh-navy);
  border-right: 1px solid rgba(255,255,255,.08);
  vertical-align: bottom;
}
.std-table thead th:last-child { border-right: none; }
.std-table thead th button {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 1px;
  width: 100%;
  padding: 14px 18px;
  color: #fff;
  text-align: left;
}
.std-table thead th button span { font-size: 13px; font-weight: 700; letter-spacing: 1.2px; }
.std-table thead th button small { font-size: 10px; font-weight: 400; letter-spacing: .4px; color: rgba(255,255,255,.55); }
.std-table thead th button:hover { background: rgba(255,255,255,.08); }
.std-table thead th button:focus-visible { outline: 2px solid #fff; outline-offset: -4px; }
.std-table thead th.is-on { background: var(--bh-teal); }
.std-table thead th.is-on button small { color: rgba(255,255,255,.82); }
.std-table thead th.is-on button:hover { background: rgba(0,0,0,.05); }

.std-table tbody td {
  padding: 10px 18px;
  border-top: 1px solid #e6ebf2;
  border-right: 1px solid #f0f3f7;
  vertical-align: middle;
  transition: background .2s;
}
.std-table tbody td:last-child { border-right: none; }
.std-spec {
  display: block;
  font-size: 10px;
  line-height: 1.55;
  letter-spacing: .35px;
  color: #94a0b2;
  white-space: nowrap;
}
.std-grade {
  display: block;
  font-size: 13.5px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--bh-navy);
  white-space: nowrap;
}
.std-none { display: inline-block; color: #c2cbd6; font-size: 13px; }
.std-table tbody td.is-on { background: rgba(2,167,131,.065); }
.std-table tbody td.is-on .std-grade { color: #017a60; }

.std-group-row th {
  padding: 11px 18px;
  text-align: left;
  background: #eef3f8;
  border-top: 2px solid #dfe7f1;
}
.std-group-row span { font-size: 12.5px; font-weight: 700; letter-spacing: .2px; color: var(--bh-navy); }
.std-group-row em {
  margin-left: 10px;
  font-style: normal;
  font-size: 10px;
  font-weight: 500;
  letter-spacing: .8px;
  color: #8b96a8;
  text-transform: uppercase;
}

.std-table tbody tr:not(.std-group-row):hover td { background: #f8fafc; }
.std-table tbody tr:not(.std-group-row):hover td.is-on { background: rgba(2,167,131,.11); }

/* ============================================================
   全屏灯箱 Lightbox
   ============================================================ */
.lb-backdrop {
  position: fixed;
  inset: 0;
  z-index: 9999;
  background: rgba(6,19,39,.92);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity .3s ease;
  backdrop-filter: blur(8px);
}
.lb-backdrop.open {
  opacity: 1;
  pointer-events: auto;
}

.lb-stage {
  max-width: 90vw;
  max-height: 82vh;
  display: flex;
  align-items: center;
  justify-content: center;
  transform: scale(.92);
  transition: transform .35s cubic-bezier(.25,.8,.35,1);
}
.lb-backdrop.open .lb-stage {
  transform: scale(1);
}

.lb-stage img {
  max-width: 90vw;
  max-height: 82vh;
  object-fit: contain;
  border-radius: 4px;
  box-shadow: 0 24px 64px rgba(0,0,0,.5);
}

.lb-close {
  position: absolute;
  top: 18px;
  right: 22px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: rgba(255,255,255,.08);
  color: #fff;
  font-size: 28px;
  line-height: 44px;
  text-align: center;
  cursor: pointer;
  transition: background .2s, transform .2s;
  z-index: 10;
}
.lb-close:hover {
  background: rgba(2,167,131,.8);
  transform: rotate(90deg);
}

.lb-nav {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: rgba(255,255,255,.08);
  color: #fff;
  font-size: 32px;
  line-height: 48px;
  text-align: center;
  cursor: pointer;
  z-index: 10;
  transition: background .2s, transform .2s;
}
.lb-nav:hover {
  background: rgba(2,167,131,.8);
}
.lb-prev { left: 24px; }
.lb-next { right: 24px; }
.lb-prev:hover { transform: translateY(-50%) translateX(-4px); }
.lb-next:hover { transform: translateY(-50%) translateX(4px); }

.lb-counter {
  position: absolute;
  bottom: 28px;
  left: 50%;
  transform: translateX(-50%);
  font-size: 13px;
  color: rgba(255,255,255,.5);
  letter-spacing: 1px;
  z-index: 10;
}

/* ============================================================
   质量保证页 Quality Assurance
   ============================================================ */

/* ---- 深色板块描述文字 ---- */
.qa-dark-desc { font-size: 15px; color: rgba(255,255,255,.62); line-height: 1.8; max-width: 780px; margin: -10px 0 36px; }

/* ---- 认证概览卡片（深色殿堂式） ---- */
.qa-cert-cards { display: grid; grid-template-columns: repeat(4,1fr); gap: 20px; margin-bottom: 56px; }
.qa-cert-card {
  position: relative;
  display: flex; flex-direction: column;
  padding: 30px 26px 24px;
  background: linear-gradient(160deg, rgba(255,255,255,.055) 0%, rgba(255,255,255,.028) 100%);
  border: 1px solid rgba(255,255,255,.10);
  border-radius: 12px;
  overflow: hidden;
  transition: border-color .35s, transform .35s, box-shadow .35s;
}
/* 顶部一线流光 */
.qa-cert-card::before {
  content: ""; position: absolute; top: 0; left: 0; right: 0; height: 2px;
  background: linear-gradient(90deg, transparent, var(--bh-teal), transparent);
  opacity: 0; transition: opacity .35s;
}
.qa-cert-card:hover { border-color: rgba(2,167,131,.55); transform: translateY(-5px); box-shadow: 0 18px 44px rgba(0,0,0,.38); }
.qa-cert-card:hover::before { opacity: 1; }

.qa-cert-ico {
  width: 46px; height: 46px; border-radius: 11px;
  display: flex; align-items: center; justify-content: center;
  background: rgba(2,167,131,.14);
  color: var(--bh-teal);
  margin-bottom: 18px;
  flex-shrink: 0;
}
.qa-cert-ico svg { width: 24px; height: 24px; }
.qa-cert-en { font-size: 11px; font-weight: 700; letter-spacing: 1.6px; text-transform: uppercase; color: var(--bh-teal); margin-bottom: 6px; }
.qa-cert-card h4 { font-size: 17px; font-weight: 700; color: #fff; line-height: 1.4; margin-bottom: 16px; }
.qa-cert-card dl { margin: 0 0 18px; }
.qa-cert-card dl div { display: flex; gap: 10px; padding: 5px 0; font-size: 12.5px; line-height: 1.55; border-bottom: 1px dashed rgba(255,255,255,.08); }
.qa-cert-card dl div:last-child { border-bottom: none; }
.qa-cert-card dt { flex: 0 0 58px; color: rgba(255,255,255,.42); }
.qa-cert-card dd { margin: 0; color: rgba(255,255,255,.82); word-break: break-all; }
.qa-cert-pages {
  margin-top: auto; align-self: flex-start;
  font-size: 11.5px; font-weight: 600; letter-spacing: .4px;
  color: #4fd6b4; background: rgba(2,167,131,.14);
  padding: 4px 11px; border-radius: 999px;
}

/* ---- 检测方法图例 ---- */
.qa-legend { display: flex; flex-wrap: wrap; gap: 12px 28px; margin-bottom: 44px; }
.qa-legend span { display: inline-flex; align-items: center; gap: 8px; font-size: 13.5px; font-weight: 500; color: var(--bh-text-2); }

/* ---- 方法色点 ---- */
.qa-dot {
  display: inline-block; width: 8px; height: 8px; border-radius: 50%;
  background: var(--c, var(--bh-teal));
  margin-right: 7px; flex-shrink: 0;
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--c, var(--bh-teal)) 18%, transparent);
  vertical-align: 1px;
}
.qa-legend .qa-dot { margin-right: 0; }

/* ---- 组内证书计数 ---- */
.qa-count { font-style: normal; font-size: 13px; font-weight: 600; color: var(--bh-teal); background: rgba(2,167,131,.10); padding: 3px 12px; border-radius: 999px; margin-left: 12px; vertical-align: 3px; letter-spacing: .3px; }

/* ---- 证书墙：竖版文献式卡片 ---- */
.qa-grid { grid-template-columns: repeat(4,1fr); }
.qa-grid .prod-photo {
  aspect-ratio: 3/4;
  padding: 12px;
  background: #fff;
  border: 1px solid var(--bh-line);
  box-shadow: 0 4px 18px rgba(10,31,59,.08);
  transition: transform .4s, box-shadow .4s, border-color .4s, opacity .45s ease;
}
.qa-grid .prod-photo:hover { transform: translateY(-6px); box-shadow: 0 16px 40px rgba(10,31,59,.16); border-color: rgba(2,167,131,.55); }
.qa-grid .prod-photo img { border-radius: 2px; box-shadow: 0 2px 10px rgba(10,31,59,.14); }
/* 证书说明浮层 */
.qa-cap {
  position: absolute; left: 10px; right: 10px; bottom: 10px;
  padding: 9px 13px;
  border-radius: 8px;
  background: rgba(6,19,39,.82);
  backdrop-filter: blur(6px);
  color: #fff;
  line-height: 1.5;
  box-shadow: 0 4px 14px rgba(0,0,0,.25);
}
.qa-cap b { display: flex; align-items: center; font-size: 12.5px; font-weight: 700; letter-spacing: .2px; }
.qa-cap span { display: block; font-size: 11.5px; color: rgba(255,255,255,.62); margin-top: 2px; }
/* 悬停时轻微上浮说明，露出证书下部 */
.qa-grid .prod-photo:hover .qa-cap { transform: translateY(-3px); }
.qa-cap { transition: transform .35s; }

/* ---- 深色板块里的证书墙 ---- */
.qa-grid--dark .prod-photo {
  background: rgba(255,255,255,.96);
  border-color: rgba(255,255,255,.14);
  box-shadow: 0 6px 24px rgba(0,0,0,.35);
}
.qa-grid--dark .prod-photo:hover { box-shadow: 0 18px 48px rgba(0,0,0,.5); }

/* ---- 证书墙小节标题（原件墙提示行） ---- */
.qa-wall-title {
  display: flex; align-items: center; gap: 14px;
  margin-bottom: 20px;
  font-size: 15px; font-weight: 700; color: #fff;
}
.qa-wall-title > span:first-child { width: 22px; height: 2px; background: var(--bh-teal); border-radius: 1px; }
.qa-wall-title > span:last-child { font-size: 12px; font-weight: 400; color: rgba(255,255,255,.4); letter-spacing: .3px; }

/* ---- 横向手风琴图集（收缩态窄条 + 悬停/点按展开） ---- */
.qa-acc { display: flex; gap: 10px; height: 440px; }
.qa-acc + .qa-acc { margin-top: 10px; }
.qa-acc-item {
  position: relative;
  flex: 1 1 0%;
  min-width: 0;
  margin: 0;
  overflow: hidden;
  border-radius: 10px;
  background: #101d33;
  box-shadow: 0 4px 18px rgba(10,31,59,.12);
  cursor: pointer;
  transition: flex-grow .55s cubic-bezier(.25,.8,.35,1);
}
.qa-acc--dark .qa-acc-item { background: #0b1424; box-shadow: 0 6px 24px rgba(0,0,0,.4); }

/* 收缩态：暗化封面 + 竖排标签 */
.qa-acc-bg {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  object-fit: cover;
  filter: brightness(.34) saturate(.85);
  transition: opacity .4s;
  pointer-events: none;
}
.qa-acc--dark .qa-acc-bg { filter: brightness(.5) saturate(.85); }
.qa-acc-strip {
  position: absolute; inset: 0;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 12px;
  padding: 18px 0;
  writing-mode: vertical-rl;
  letter-spacing: 2.5px;
  font-size: 14px; font-weight: 600; color: #fff;
  text-shadow: 0 1px 8px rgba(0,0,0,.65);
  transition: opacity .35s;
  pointer-events: none;
  overflow: hidden; white-space: nowrap;
}
.qa-acc-strip .qa-dot { margin-right: 0; }

/* 展开态：白色文档 + 底部说明 */
.qa-acc-doc {
  position: absolute; left: 14px; right: 14px; top: 14px; bottom: 56px;
  width: calc(100% - 28px); height: calc(100% - 70px);
  object-fit: contain;
  background: #fff;
  border-radius: 6px;
  padding: 8px;
  box-shadow: 0 4px 16px rgba(0,0,0,.18);
  opacity: 0;
  transition: opacity .4s .12s;
  cursor: zoom-in;
}
.qa-acc .qa-cap { left: 14px; right: 14px; bottom: 10px; opacity: 0; transition: opacity .4s .12s; }

/* 展开状态：桌面 hover / 触屏 .open / 非悬停时的默认项 .default */
.qa-acc-item.open { flex-grow: 5; }
.qa-acc:not(:hover) .qa-acc-item.default { flex-grow: 5; }
.qa-acc-item.open .qa-acc-bg,
.qa-acc:not(:hover) .qa-acc-item.default .qa-acc-bg { opacity: 0; }
.qa-acc-item.open .qa-acc-strip,
.qa-acc:not(:hover) .qa-acc-item.default .qa-acc-strip { opacity: 0; }
.qa-acc-item.open .qa-acc-doc,
.qa-acc:not(:hover) .qa-acc-item.default .qa-acc-doc { opacity: 1; }
.qa-acc-item.open .qa-cap,
.qa-acc:not(:hover) .qa-acc-item.default .qa-cap { opacity: 1; }

/* 桌面悬停展开（触屏设备不启用，避免粘滞 hover） */
@media (hover: hover) and (pointer: fine) {
  .qa-acc-item:hover { flex-grow: 5; }
  .qa-acc-item:hover .qa-acc-bg { opacity: 0; }
  .qa-acc-item:hover .qa-acc-strip { opacity: 0; }
  .qa-acc-item:hover .qa-acc-doc { opacity: 1; }
  .qa-acc-item:hover .qa-cap { opacity: 1; }
}

/* ============================================================
   触屏设备：取消依赖悬停的位移 / 缩放，避免点按后样式“粘住”
   这是设备能力适配，与屏幕宽度无关，故留在全站基础样式里
   （小屏布局覆盖统一在 css/mobile.css）
   ============================================================ */
@media (hover: none) {
  .bh-card:hover img,
  .bh-material-card:hover .bh-material-card-img img,
  .prod-photo:hover img,
  .bh-material-card:hover,
  .bh-module:hover,
  .bh-cert-cell:hover,
  .qa-grid .prod-photo:hover { transform: none; }
  .bh-stair-item:hover .bh-stair-head { transform: none; }
}

/* ============================================================
   英文版（/en/）专用微调
   只作用于 <html lang="en"> 的页面，中文页完全不受影响
   ============================================================ */
/* 英文全称比中文长，页头 logo 改为两行，字距收紧 */
html[lang="en"] .bh-logo-text {
  display:flex; flex-direction:column; gap:1px;
  font-size:17px; letter-spacing:.2px; line-height:1.18;
}
html[lang="en"] .bh-logo-text-sub {
  font-size:11.5px; font-weight:600; letter-spacing:.2px; color:#52627a;
}
/* 英文标题不能强制单行，否则会顶出容器 */
html[lang="en"] .bh-heading--single { white-space:normal; }
/* 这句引题整句 72 个字符，38px 需要 1397px 宽，1200px 栏宽装不下；
   桌面档收到 32px（实测 1179px）即可单行，窄于此档仍按原来的两行显示 */
@media (min-width:1280px) {
  html[lang="en"] .bh-heading--single { white-space:nowrap; font-size:32px; }
}
/* 英文简介比中文长一倍，图片改左浮动、文字绕排，绕完再回到整栏宽度，整栏更矮；
   641px 以下仍是"图在上、文字在下"的单列叠放，不做绕排 */
@media (min-width:641px) {
  html[lang="en"] .bh-footer-intro-body { display:block; }
  html[lang="en"] .bh-footer-intro-body::after { content:""; display:block; clear:both; }
  html[lang="en"] .bh-footer-intro-body img { float:left; margin:0 14px 6px 0; }
}
/* 英文这句说明放在标题下方左对齐、单行显示（整句 683px，1200px 版心放得下） */
html[lang="en"] .digital-head { flex-direction:column; align-items:flex-start; gap:10px; }
html[lang="en"] .digital-head-desc { max-width:none; }
/* 英文导航字号略收，六个词条在 993–1100 档也不换行 */
html[lang="en"] .mega-nav-links a,
html[lang="en"] .nav-mega-trigger { letter-spacing:0; }
/* 英文 hero：栏宽放宽到 1110px，三条卖点（44px 下 1010px）才能并成一行 */
html[lang="en"] .hero-text { max-width:1110px; }
html[lang="en"] .hero-text h2 { max-width:720px; }
html[lang="en"] .hero-text h1 em { white-space:nowrap; }
/* 只在桌面档收字号（≤1279 由 mobile.css 控制，避免优先级把手机号盖掉） */
@media (min-width:1280px) {
  html[lang="en"] .hero-text h1 { font-size:44px; }
}