/* ===== BNC.同轴连接器.公司 —— 商业科技风（浅色精密工程主题） ===== */
:root{
  --bg:#F4F6F9;
  --surface:#FFFFFF;
  --ink:#17233B;
  --muted:#5A6B85;
  --line:#E2E8F1;
  --primary:#12406E;
  --primary-2:#1B6FB8;
  --accent:#E86A10;
  --accent-soft:#FDF1E7;
  --blue-soft:#EAF3FB;
  --radius:10px;
  --shadow:0 1px 3px rgba(23,35,59,.06),0 8px 24px rgba(23,35,59,.06);
  --wrap:1180px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei","Noto Sans SC",sans-serif;
  background:var(--bg);color:var(--ink);line-height:1.75;font-size:16px;
}
h1,h2,h3,h4{line-height:1.35;color:var(--ink)}
h1,h2,h3,p,li,td,th{overflow-wrap:anywhere;word-break:break-word}
a{color:var(--primary-2);text-decoration:none}
a:hover{color:var(--accent)}
img{max-width:100%;height:auto}
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 24px}
.skip-link{position:absolute;left:-9999px;top:0;background:var(--primary);color:#fff;padding:8px 16px;z-index:200}
.skip-link:focus{left:8px;top:8px}

/* ===== Header ===== */
.site-header{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.94);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:64px;gap:24px}
.brand{display:flex;align-items:center;gap:10px;color:var(--primary);font-size:17px}
.brand-mark{width:30px;height:30px;color:var(--primary-2)}
.brand-text strong{color:var(--accent);font-weight:800}
.site-nav{display:flex;gap:6px}
.site-nav a{padding:8px 14px;border-radius:8px;color:var(--ink);font-size:15px;font-weight:500}
.site-nav a:hover{background:var(--blue-soft);color:var(--primary)}
.nav-toggle{display:none;flex-direction:column;gap:5px;background:none;border:0;cursor:pointer;padding:8px}
.nav-toggle span{display:block;width:22px;height:2px;background:var(--ink)}

/* ===== 通用区块 ===== */
.page{min-height:60vh}
.section{padding:56px 0}
.section-head{margin-bottom:32px}
.section-head .kicker{display:inline-block;font-size:13px;font-weight:700;letter-spacing:.12em;color:var(--accent);text-transform:uppercase;margin-bottom:8px}
.section-head h2{font-size:28px;margin-bottom:10px}
.section-head p{color:var(--muted);max-width:760px}
.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:24px;box-shadow:var(--shadow);transition:transform .18s ease,box-shadow .18s ease}
.card:hover{transform:translateY(-3px);box-shadow:0 4px 10px rgba(23,35,59,.08),0 14px 34px rgba(23,35,59,.1)}
.card h3{font-size:18px;margin-bottom:8px}
.card p{color:var(--muted);font-size:14.5px}
.card .card-num{font-size:13px;font-weight:700;color:var(--primary-2);letter-spacing:.08em;margin-bottom:6px;display:block}
.btn{display:inline-flex;align-items:center;gap:8px;padding:11px 22px;border-radius:8px;font-weight:600;font-size:15px;border:0;cursor:pointer}
.btn-primary{background:var(--primary);color:#fff}
.btn-primary:hover{background:var(--primary-2);color:#fff}
.btn-ghost{background:transparent;color:var(--primary);border:1px solid var(--primary)}
.btn-ghost:hover{border-color:var(--accent);color:var(--accent)}
.chip{display:inline-block;padding:3px 10px;border-radius:99px;background:var(--blue-soft);color:var(--primary);font-size:12.5px;font-weight:600;margin:2px 4px 2px 0}

/* ===== Hero ===== */
.hero{background:linear-gradient(135deg,#0E2F52 0%,#12406E 55%,#1B6FB8 100%);color:#fff;padding:88px 0 96px;position:relative;overflow:hidden}
.hero::before{content:"";position:absolute;inset:0;background-image:linear-gradient(rgba(255,255,255,.05) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.05) 1px,transparent 1px);background-size:44px 44px;pointer-events:none}
.hero .wrap{position:relative}
.hero-kicker{font-size:14px;font-weight:600;letter-spacing:.14em;color:#FFC08A;margin-bottom:14px}
.hero h1{font-size:40px;color:#fff;margin-bottom:18px;max-width:820px}
.hero p.lead{font-size:17.5px;color:#CFE0F2;max-width:760px;margin-bottom:28px}
.hero-specs{display:flex;flex-wrap:wrap;gap:14px;margin-top:34px}
.hero-spec{background:rgba(255,255,255,.09);border:1px solid rgba(255,255,255,.18);border-radius:8px;padding:12px 18px}
.hero-spec b{display:block;font-size:20px;color:#fff}
.hero-spec span{font-size:12.5px;color:#B9CFE8}
.hero-actions{display:flex;gap:14px;margin-top:30px;flex-wrap:wrap}
.hero .btn-primary{background:var(--accent)}
.hero .btn-primary:hover{background:#F97F26}
.hero .btn-ghost{color:#fff;border-color:rgba(255,255,255,.5)}
.hero .btn-ghost:hover{border-color:#FFC08A;color:#FFC08A}

/* ===== 首页产品导览 ===== */
.cat-card{position:relative}
.cat-card::after{content:"→";position:absolute;right:22px;top:22px;color:var(--accent);font-weight:700;transition:transform .18s}
.cat-card:hover::after{transform:translateX(4px)}

/* ===== 参数表 ===== */
table.spec{width:100%;border-collapse:collapse;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;font-size:14.5px;margin:20px 0}
table.spec th{background:var(--primary);color:#fff;font-weight:600;padding:11px 14px;text-align:left;white-space:nowrap}
table.spec td{padding:10px 14px;border-top:1px solid var(--line);vertical-align:top}
table.spec tr:nth-child(even) td{background:#F8FAFD}
.table-scroll{overflow-x:auto;-webkit-overflow-scrolling:touch}

/* ===== 列表页布局（[M1'] 左侧分类） ===== */
.list-layout{display:grid;grid-template-columns:250px 1fr;gap:36px;padding:40px 0 64px}
.cat-side{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:18px;align-self:start;position:sticky;top:88px}
.cat-side h3{font-size:15px;color:var(--muted);font-weight:600;margin-bottom:10px;letter-spacing:.06em}
ul.category-list{list-style:none}
ul.category-list li a{display:block;padding:10px 12px;border-radius:8px;color:var(--ink);font-size:15px}
ul.category-list li a:hover,ul.category-list li a.active{background:var(--blue-soft);color:var(--primary);font-weight:600}
.cat-content .item{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:22px 24px;margin-bottom:16px;box-shadow:var(--shadow)}
.cat-content .item h3{font-size:18.5px;margin-bottom:6px}
.cat-content .item p{color:var(--muted);font-size:14.5px;margin-bottom:8px}
.item-meta{display:flex;flex-wrap:wrap;gap:6px}
.cat-intro{background:var(--blue-soft);border:1px solid #D3E5F5;border-radius:var(--radius);padding:18px 22px;color:var(--primary);font-size:14.5px;margin-bottom:22px}

/* ===== 详情页 ===== */
.detail-layout{display:grid;grid-template-columns:minmax(0,760px) 240px;gap:40px;justify-content:center;padding:40px 0 64px}
.article-head h1{font-size:32px;margin:10px 0 14px}
.article-head .meta{color:var(--muted);font-size:13.5px;display:flex;flex-wrap:wrap;gap:14px;margin-bottom:8px}
.tag-text{display:inline-block;background:var(--blue-soft);color:var(--primary);border-radius:6px;padding:2px 9px;font-size:12.5px;margin-right:6px}
.article-body{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:36px 40px;box-shadow:var(--shadow)}
.article-body h2{font-size:22px;margin:34px 0 14px;padding-left:12px;border-left:4px solid var(--accent)}
.article-body h3{font-size:17.5px;margin:24px 0 10px}
.article-body p{margin:12px 0;color:#24324E}
.article-body ul,.article-body ol{margin:12px 0 12px 22px}
.article-body li{margin:6px 0}
.article-body blockquote{background:var(--accent-soft);border-left:4px solid var(--accent);padding:14px 18px;border-radius:0 8px 8px 0;margin:16px 0;color:#5C3A17;font-size:15px}
.article-body blockquote p{margin:4px 0;color:inherit}
.time-line{color:var(--muted);font-size:13px;margin:10px 0 4px;display:block}
.summary-block{background:var(--blue-soft);border-radius:var(--radius);padding:18px 22px;margin:16px 0;font-size:15.5px}
.kw-line{font-size:13.5px;color:var(--muted);margin-bottom:10px}
.callout-exp{background:#F0F7F0;border-left:4px solid #3E8E4E;border-radius:0 8px 8px 0;padding:14px 18px;margin:18px 0;font-size:14.5px}

/* ===== TOC 悬浮（[M1''] sticky，禁 fixed） ===== */
.toc-aside{position:sticky;top:88px;max-height:calc(100vh - 110px);overflow-y:auto;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:18px}
.toc-aside h4{font-size:14px;color:var(--muted);margin-bottom:10px;letter-spacing:.06em}
#toc{list-style:none;font-size:14px}
#toc li{margin:6px 0}
#toc a{color:var(--ink);display:block;padding:4px 8px;border-left:2px solid transparent}
#toc a:hover,#toc a.active{color:var(--primary-2);border-left-color:var(--accent);background:#F8FAFD}

/* ===== FAQ（裸 details） ===== */
details{background:var(--surface);border:1px solid var(--line);border-radius:8px;margin:10px 0}
details summary{cursor:pointer;padding:14px 18px;font-weight:600;font-size:15px;list-style:none;position:relative;padding-right:40px}
details summary::-webkit-details-marker{display:none}
details summary::after{content:"+";position:absolute;right:18px;top:50%;transform:translateY(-50%);color:var(--accent);font-size:20px;font-weight:700}
details[open] summary::after{content:"−"}
details .faq-a{padding:0 18px 16px;color:#24324E;font-size:14.5px}
details{border-left:3px solid var(--primary-2)}

/* ===== 面包屑 ===== */
.breadcrumb{padding:18px 0 0}
.breadcrumb-list{display:flex;flex-wrap:wrap;gap:6px;list-style:none;font-size:13.5px;color:var(--muted)}
.breadcrumb-list li+li::before{content:"›";margin-right:6px;color:#9AA9BF}
.breadcrumb-list a{color:var(--muted)}
.breadcrumb-list a:hover{color:var(--accent)}

/* ===== 服务包 ===== */
.svc-band{background:linear-gradient(180deg,#fff, #F4F6F9)}
.svc-num{display:inline-flex;width:34px;height:34px;border-radius:8px;background:var(--primary);color:#fff;align-items:center;justify-content:center;font-weight:700;margin-bottom:12px}

/* ===== 页脚 ===== */
.site-footer{background:#0F2440;color:#B9C8DD;margin-top:40px;padding:52px 0 28px}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:32px;padding-bottom:34px;border-bottom:1px solid rgba(255,255,255,.12)}
.footer-col h4{color:#fff;font-size:15.5px;margin-bottom:14px}
.footer-col a{display:block;color:#B9C8DD;font-size:14px;padding:4px 0}
.footer-col a:hover{color:#FFC08A}
.footer-col p{font-size:13.5px;color:#8FA5C2}
.footer-org{margin-top:8px}
.footer-beian{display:flex;flex-wrap:wrap;justify-content:center;align-items:center;gap:22px;padding-top:22px;font-size:13px}
.beian-item{display:inline-flex;align-items:center;gap:6px;color:#B9C8DD}
.beian-item:hover{color:#fff}
.beian-item img{width:14px;height:14px;display:inline-block}

/* ===== 底部居中胶囊 ===== */
/* 右侧竖排悬浮条（垂直居中）：企业微信名片 + 回到顶部 */
.float-capsule{position:fixed;right:16px;top:50%;transform:translateY(-50%);z-index:150;display:flex;flex-direction:column;align-items:stretch;background:rgba(15,36,64,.92);backdrop-filter:blur(6px);border:1px solid rgba(255,255,255,.15);border-radius:14px;padding:8px 6px;box-shadow:0 8px 28px rgba(10,25,47,.35)}
.cap-btn{display:flex;flex-direction:column;align-items:center;gap:5px;background:none;border:0;color:#fff;font-size:12px;font-weight:600;cursor:pointer;padding:9px 8px;border-radius:10px;transition:background .15s;line-height:1.2;white-space:nowrap}
.cap-btn:hover{background:rgba(255,255,255,.12)}
.cap-btn svg{width:20px;height:20px;fill:currentColor}
.cap-wechat svg{fill:#4FDA6B}
.cap-divider{width:24px;height:1px;background:rgba(255,255,255,.25);margin:3px auto}

/* ===== 名片弹层 ===== */
.card-modal{position:fixed;inset:0;z-index:300;display:flex;align-items:center;justify-content:center}
.card-modal[hidden]{display:none}
.card-modal-mask{position:absolute;inset:0;background:rgba(10,20,35,.72)}
.card-modal-body{position:relative;background:#fff;border-radius:14px;padding:16px;box-shadow:0 24px 70px rgba(0,0,0,.4);max-width:calc(100vw - 40px)}
.card-modal-img{display:block;width:300px;height:500px;object-fit:contain;border-radius:8px;background:#fff}
.card-modal-close{position:absolute;top:-14px;right:-14px;width:34px;height:34px;border-radius:50%;background:var(--primary);color:#fff;border:0;font-size:20px;cursor:pointer;line-height:1;box-shadow:0 4px 12px rgba(0,0,0,.3)}
.card-modal-tip{text-align:center;color:var(--muted);font-size:12.5px;margin-top:10px}

/* ===== 其他 ===== */
.page-head{padding:46px 0 10px}
.page-head h1{font-size:32px;margin-bottom:8px}
.page-head p{color:var(--muted)}
.pager{display:flex;gap:8px;justify-content:center;margin:28px 0}
.pager a,.pager span{padding:7px 13px;border:1px solid var(--line);border-radius:8px;background:var(--surface);font-size:14px;color:var(--ink)}
.pager .current{background:var(--primary);color:#fff;border-color:var(--primary)}
.related-block{margin-top:34px;padding-top:22px;border-top:1px dashed var(--line)}
.related-block h3{font-size:18px;margin-bottom:12px}
.related-block li{margin:8px 0}
.related-block .why{color:var(--muted);font-size:13.5px}