/* ============================================================
   Sandeli 官网 · 高端企业级样式（明亮商务风）
   白色/浅灰打底 / 深蓝点缀 / 数据化呈现 / 大字号排版
   ============================================================ */
:root {
  --bg: #ffffff;
  --bg-2: #f4f7fb;
  --bg-3: #eef3f9;
  --card: #ffffff;
  --line: #e3eaf3;
  --line-2: #cdd9e8;
  --ink: #14213d;
  --ink-2: #3d4f6b;
  --muted: #6b7f99;
  --blue: #1a5fd0;
  --blue-2: #2f7bff;
  --blue-3: #4d94ff;
  --cyan: #0e9aa7;
  --grad: linear-gradient(120deg, #1a5fd0 0%, #2f7bff 55%, #38b6d8 100%);
  --radius: 14px;
  --shadow: 0 14px 44px rgba(20, 33, 61, .10);
  --shadow-sm: 0 4px 16px rgba(20, 33, 61, .07);
  --font: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SF Mono", Consolas, "Courier New", monospace;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--ink);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
.container { width: min(1200px, 92%); margin: 0 auto; }
::selection { background: var(--blue-2); color: #fff; }

/* ---------- 顶部导航 ---------- */
.site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  transition: background .3s, box-shadow .3s;
  background: rgba(255,255,255,.82);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
}
.site-header.scrolled { background: rgba(255,255,255,.96); border-bottom-color: var(--line); box-shadow: 0 8px 30px rgba(20,33,61,.08); }
.nav-wrap { display: flex; align-items: center; justify-content: space-between; height: 76px; }
.brand { display: flex; align-items: center; gap: 12px; }
.brand-mark {
  width: 42px; height: 42px; border-radius: 11px;
  background: var(--grad);
  display: flex; align-items: center; justify-content: center;
  font-weight: 800; font-size: 15px; color: #fff;
  letter-spacing: 1px; box-shadow: 0 6px 18px rgba(47,123,255,.3);
}
.brand-name { font-size: 16px; font-weight: 700; color: var(--ink); line-height: 1.2; letter-spacing: .5px; }
.brand-name small { display: block; font-size: 10.5px; font-weight: 500; color: var(--muted); letter-spacing: 1.5px; }
    .brand-mark { overflow: hidden; }
    .brand-mark.brand-has-img { width: auto; height: 40px; background: transparent; box-shadow: none; border-radius: 0; padding: 0; }
    .brand-has-img .brand-img { height: 40px; max-width: 200px; object-fit: contain; display: block; }
    .footer-logo-img { height: 42px; width: auto; max-width: 220px; object-fit: contain; display: block; margin-bottom: 16px; }
.nav-links { display: flex; align-items: center; gap: 4px; list-style: none; }
.nav-links a {
  display: block; padding: 9px 15px; border-radius: 8px;
  color: var(--ink-2); font-size: 14.5px; font-weight: 500;
  transition: .2s; position: relative;
}
.nav-links a:hover, .nav-links a.active { color: var(--blue); background: rgba(47,123,255,.08); }
.nav-cta {
  background: var(--grad); color: #fff !important; font-weight: 600;
  margin-left: 10px; padding: 10px 20px !important;
}
.nav-cta:hover { box-shadow: 0 8px 24px rgba(47,123,255,.35); transform: translateY(-1px); color: #fff !important; }
.nav-toggle { display: none; background: none; border: 0; cursor: pointer; width: 40px; height: 40px; }
.nav-toggle span { display: block; width: 22px; height: 2px; background: var(--ink); margin: 5px auto; border-radius: 2px; }

/* ---------- Hero ---------- */
.hero {
  position: relative; min-height: 92vh;
  display: flex; align-items: center;
  padding: 150px 0 110px;
  overflow: hidden;
  background:
    radial-gradient(900px 480px at 85% -10%, rgba(47,123,255,.14), transparent 60%),
    radial-gradient(700px 420px at 5% 110%, rgba(14,154,167,.10), transparent 60%),
    linear-gradient(180deg, #f8fbff 0%, #ffffff 60%, #f4f8fe 100%);
}
.hero::before {
  content: ""; position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(20,33,61,.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(20,33,61,.035) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(760px 480px at 50% 30%, #000 25%, transparent 75%);
}
.hero .container { position: relative; z-index: 2; }
.hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 12.5px; letter-spacing: 1.5px; color: var(--blue);
  border: 1px solid rgba(47,123,255,.28); border-radius: 999px;
  padding: 7px 16px; background: rgba(47,123,255,.06);
}
.hero-badge .dot { width: 6px; height: 6px; border-radius: 50%; background: var(--blue-2); box-shadow: 0 0 10px rgba(47,123,255,.6); }
.hero h1 {
  font-size: clamp(34px, 5.2vw, 60px); font-weight: 800; line-height: 1.18;
  margin: 26px 0 22px; letter-spacing: 1px; color: var(--ink);
}
.hero h1 .grad-text {
  background: var(--grad);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero-sub {
  font-size: clamp(15px, 1.8vw, 18px); color: var(--ink-2);
  max-width: 680px; line-height: 1.85;
}
.hero-metrics {
  display: flex; gap: 0; margin-top: 44px;
  border-top: 1px solid var(--line);
  padding-top: 30px; flex-wrap: wrap;
}
.hero-metric { padding: 0 34px; position: relative; }
.hero-metric:first-child { padding-left: 0; }
.hero-metric:not(:last-child)::after {
  content: ""; position: absolute; right: 0; top: 4px; bottom: 4px;
  width: 1px; background: var(--line);
}
.hero-metric .num { font-size: clamp(22px, 2.6vw, 30px); font-weight: 800; color: var(--ink); }
.hero-metric .num em { font-style: normal; color: var(--blue-2); }
.hero-metric .lbl { font-size: 12.5px; color: var(--muted); margin-top: 4px; letter-spacing: 1px; }
.hero-actions { display: flex; gap: 14px; margin-top: 40px; flex-wrap: wrap; }
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 14px 30px; border-radius: 10px; font-size: 15px; font-weight: 600;
  transition: .25s; cursor: pointer; border: 0; font-family: var(--font);
}
.btn-primary { background: var(--grad); color: #fff; box-shadow: 0 8px 28px rgba(47,123,255,.3); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 12px 34px rgba(47,123,255,.42); }
.btn-ghost { background: transparent; color: var(--blue); border: 1.5px solid rgba(47,123,255,.4); }
.btn-ghost:hover { border-color: var(--blue); color: var(--blue); background: rgba(47,123,255,.06); }
.btn-outline-light { background: transparent; color: var(--ink); border: 1px solid var(--line-2); }
.btn-outline-light:hover { border-color: var(--blue); color: var(--blue); background: rgba(47,123,255,.05); }

/* ---------- 区块通用 ---------- */
.section { padding: 100px 0; position: relative; }
.section.alt { background: var(--bg-2); }
.section.alt-2 { background: var(--bg-3); }
.section-head { max-width: 760px; margin-bottom: 56px; }
.section-head.center { margin-left: auto; margin-right: auto; text-align: center; }
.kicker {
  display: inline-flex; align-items: center; gap: 10px;
  font-size: 12px; font-weight: 700; letter-spacing: 3px;
  color: var(--blue); text-transform: uppercase;
}
.kicker::before { content: ""; width: 26px; height: 1px; background: var(--blue); }
.section-head.center .kicker::after { content: ""; width: 26px; height: 1px; background: var(--blue); }
.section-head h2 {
  font-size: clamp(26px, 3.4vw, 40px); font-weight: 800; line-height: 1.3;
  margin: 14px 0 14px; letter-spacing: .5px; color: var(--ink);
}
.section-head p { color: var(--ink-2); font-size: 15.5px; }

/* ---------- 产品 ---------- */
.product-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(270px, 1fr)); gap: 22px; }
.product-card {
  background: var(--card);
  border: 1px solid var(--line); border-radius: var(--radius);
  padding: 32px 28px; transition: .3s; position: relative; overflow: hidden;
  box-shadow: var(--shadow-sm);
}
.product-card::before {
  content: ""; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: var(--grad); opacity: 0; transition: .3s;
}
.product-card:hover { transform: translateY(-6px); border-color: rgba(47,123,255,.45); box-shadow: var(--shadow); }
.product-card:hover::before { opacity: 1; }
.product-card .p-icon {
  width: 52px; height: 52px; border-radius: 13px;
  background: rgba(47,123,255,.1); border: 1px solid rgba(47,123,255,.22);
  display: flex; align-items: center; justify-content: center;
  font-size: 24px; margin-bottom: 20px;
}
.product-card .p-en { font-size: 11px; letter-spacing: 1.5px; color: var(--blue); text-transform: uppercase; font-weight: 600; }
.product-card h3 { font-size: 20px; font-weight: 700; margin: 6px 0 10px; color: var(--ink); }
.product-card p { font-size: 13.8px; color: var(--ink-2); line-height: 1.75; }
.product-card .p-specs { margin: 18px 0 0; list-style: none; border-top: 1px solid var(--line); padding-top: 16px; }
.product-card .p-specs li { font-size: 12.5px; color: var(--muted); padding: 4px 0; display: flex; gap: 8px; }
.product-card .p-specs li::before { content: "◆"; color: var(--blue-2); font-size: 9px; transform: translateY(3px); }
.product-card .p-more {
  display: inline-flex; align-items: center; gap: 6px; margin-top: 18px;
  font-size: 13.5px; font-weight: 600; color: var(--blue);
}
.product-card .p-more::after { content: "→"; transition: transform .2s; }
.product-card:hover .p-more::after { transform: translateX(4px); }

/* ---------- 技术参数条 ---------- */
.tech-strip { border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); background: var(--bg-2); }
.tech-strip .container { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); }
.tech-item { padding: 28px 24px; border-left: 1px solid var(--line); }
.tech-item:first-child { border-left: 0; }
.tech-item .t-num { font-family: var(--font-mono); font-size: 26px; font-weight: 700; color: var(--ink); }
.tech-item .t-num em { font-style: normal; color: var(--blue-2); }
.tech-item .t-lbl { font-size: 12.5px; color: var(--muted); margin-top: 6px; letter-spacing: 1px; }

/* ---------- 能力优势 ---------- */
.adv-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 20px; }
.adv-item {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 30px 26px; transition: .25s; box-shadow: var(--shadow-sm);
}
.adv-item:hover { border-color: rgba(14,154,167,.45); transform: translateY(-3px); box-shadow: var(--shadow); }
.adv-item .a-ico {
  width: 46px; height: 46px; border-radius: 12px;
  background: linear-gradient(135deg, rgba(47,123,255,.12), rgba(14,154,167,.1));
  border: 1px solid rgba(47,123,255,.22);
  display: flex; align-items: center; justify-content: center; font-size: 20px; margin-bottom: 18px;
}
.adv-item h4 { font-size: 17px; color: var(--ink); font-weight: 700; margin-bottom: 10px; }
.adv-item p { font-size: 13.5px; color: var(--ink-2); line-height: 1.75; }

/* ---------- 列表（案例/新闻） ---------- */
.list-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(340px, 1fr)); gap: 20px; }
.list-item {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 26px 24px; transition: .25s; display: flex; flex-direction: column; gap: 10px;
  box-shadow: var(--shadow-sm);
}
.list-item:hover { border-color: rgba(47,123,255,.4); transform: translateY(-3px); box-shadow: var(--shadow); }
.list-item .l-meta { display: flex; gap: 14px; align-items: center; font-size: 12px; color: var(--muted); }
.list-item .l-cat {
  color: var(--cyan); font-weight: 600; background: rgba(14,154,167,.08);
  border: 1px solid rgba(14,154,167,.22); padding: 2px 10px; border-radius: 5px;
}
.list-item h3 { font-size: 16.5px; line-height: 1.55; color: var(--ink); font-weight: 600; }
.list-item h3 a:hover { color: var(--blue); }
.list-item p { font-size: 13.5px; color: var(--ink-2); line-height: 1.7; }
.list-item .l-more { margin-top: auto; font-size: 13px; color: var(--blue); font-weight: 600; }

/* ---------- 文章/案例详情 ---------- */
.article { max-width: 820px; margin: 0 auto; }
.article h1 { font-size: clamp(26px, 3.4vw, 38px); line-height: 1.4; margin-bottom: 18px; color: var(--ink); }
.article .a-meta { color: var(--muted); font-size: 13px; margin-bottom: 32px; padding-bottom: 24px; border-bottom: 1px solid var(--line); }
.article .a-body { font-size: 15.5px; color: var(--ink-2); line-height: 2; }
.article .a-body p { margin-bottom: 18px; }

/* ---------- FAQ ---------- */
.faq-list { max-width: 860px; margin: 0 auto; display: grid; gap: 14px; }
.faq-item {
  background: var(--card); border: 1px solid var(--line); border-radius: 12px; overflow: hidden;
  box-shadow: var(--shadow-sm);
}
.faq-item summary {
  cursor: pointer; padding: 20px 24px; font-size: 15.5px; font-weight: 600; color: var(--ink);
  display: flex; justify-content: space-between; align-items: center; gap: 16px;
  list-style: none;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: "+"; font-size: 22px; color: var(--blue-2); transition: .2s; }
.faq-item[open] summary::after { transform: rotate(45deg); }
.faq-item .faq-a { padding: 0 24px 22px; color: var(--ink-2); font-size: 14.5px; line-height: 1.9; }

/* ---------- 参数表 ---------- */
.param-table { width: 100%; border-collapse: collapse; background: var(--card); border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow-sm); }
.param-table th, .param-table td { padding: 15px 20px; text-align: left; font-size: 14px; border-bottom: 1px solid var(--line); }
.param-table th { background: var(--bg-2); color: var(--ink); font-weight: 600; width: 32%; }
.param-table tr:last-child th, .param-table tr:last-child td { border-bottom: 0; }
.param-table td { color: var(--ink-2); }

/* ---------- 联系/CTA ---------- */
.cta-band {
  position: relative; padding: 90px 0; text-align: center; overflow: hidden;
  background: linear-gradient(135deg, #eaf2ff 0%, #f0f9fb 100%);
  border-top: 1px solid var(--line); border-bottom: 1px solid var(--line);
}
.cta-band h2 { font-size: clamp(24px, 3.2vw, 36px); font-weight: 800; color: var(--ink); }
.cta-band p { margin: 14px auto 30px; color: var(--ink-2); max-width: 560px; font-size: 15px; }
.contact-cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 18px; }
.contact-card {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 28px 24px; text-align: left; box-shadow: var(--shadow-sm);
}
.contact-card .c-ico { font-size: 22px; margin-bottom: 12px; }
.contact-card h4 { font-size: 14px; color: var(--muted); font-weight: 500; margin-bottom: 6px; }
.contact-card .c-val { font-size: 16px; color: var(--ink); font-weight: 600; word-break: break-all; }

/* ---------- 页脚（深蓝稳重收尾） ---------- */
.site-footer { background: #0d1b34; border-top: 1px solid rgba(255,255,255,.08); padding: 60px 0 26px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1.4fr; gap: 40px; }
.footer-grid h4 { color: #fff; font-size: 14.5px; margin-bottom: 18px; font-weight: 600; }
.footer-grid ul { list-style: none; }
.footer-grid li { margin-bottom: 10px; font-size: 13.5px; color: #9db2cc; }
.footer-grid a { color: #9db2cc; transition: .2s; }
.footer-grid a:hover { color: #fff; }
.footer-bottom {
  margin-top: 44px; padding-top: 22px; border-top: 1px solid rgba(255,255,255,.1);
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 10px;
  font-size: 12.5px; color: #7d92ad;
}
.footer-grid > div:first-child p { color: #9db2cc; }

/* ---------- 页面头 ---------- */
.page-head {
  padding: 150px 0 70px; position: relative; overflow: hidden;
  background:
    radial-gradient(700px 400px at 85% 0%, rgba(47,123,255,.12), transparent 60%),
    linear-gradient(180deg, #f2f7ff, var(--bg));
  border-bottom: 1px solid var(--line);
}
.page-head h1 { font-size: clamp(28px, 3.8vw, 42px); font-weight: 800; color: var(--ink); }
.page-head p { margin-top: 14px; color: var(--ink-2); max-width: 700px; font-size: 15.5px; }
.crumbs { font-size: 13px; color: var(--muted); margin-top: 20px; }
.crumbs a { color: var(--muted); }
.crumbs a:hover { color: var(--blue); }
.crumbs .sep { margin: 0 8px; color: var(--line-2); }

/* ---------- 页内导航标签 ---------- */
.tab-bar { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 40px; }
.tab-btn {
  padding: 9px 20px; border-radius: 999px; font-size: 13.5px; font-weight: 500;
  border: 1px solid var(--line-2); color: var(--ink-2); cursor: pointer;
  background: var(--bg); transition: .2s; font-family: var(--font);
}
.tab-btn:hover { color: var(--blue); border-color: var(--blue); }
.tab-btn.active { background: var(--grad); color: #fff; border-color: transparent; }

/* ---------- 滚动出现动画 ---------- */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity .6s ease, transform .6s ease; }
.reveal.visible { opacity: 1; transform: translateY(0); }

/* ---------- 移动端 ---------- */
@media (max-width: 900px) {
  .nav-toggle { display: block; }
  .nav-links {
    position: fixed; inset: 76px 0 auto 0; background: rgba(255,255,255,.98);
    flex-direction: column; align-items: stretch; padding: 14px 18px 24px;
    border-bottom: 1px solid var(--line); transform: translateY(-130%); transition: .3s;
    box-shadow: 0 20px 40px rgba(20,33,61,.12);
  }
  .nav-links.open { transform: translateY(0); }
  .nav-links a { padding: 13px 16px; }
  .nav-cta { margin-left: 0; text-align: center; }
  .section { padding: 70px 0; }
  .hero { padding-top: 120px; min-height: 0; }
  .hero-metric { padding: 0 20px; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 28px; }
  .tech-strip .container { grid-template-columns: 1fr 1fr; }
  .tech-item:nth-child(odd) { border-left: 0; }
}
@media (max-width: 560px) {
  .footer-grid { grid-template-columns: 1fr; }
  .hero-metric { width: 50%; padding: 0 0 16px !important; border-left: 0 !important; }
  .hero-metrics { gap: 10px; }
  .list-grid { grid-template-columns: 1fr; }
}

/* ---------- 参考站风格：区块标题（左竖线 + 浅灰底） ---------- */
.block-title {
  display: flex; align-items: center; gap: 10px;
  border-left: 4px solid var(--blue);
  background: var(--bg-2);
  padding: 10px 20px;
  margin: 8px 0 18px;
  border-bottom: 1px solid var(--line);
  color: var(--blue);
  font-size: 20px;
  font-weight: 700;
}
.block-title::after { content: ""; flex: 1; height: 1px; background: var(--line); margin-left: 8px; }

/* ---------- 产品页：左侧锚点侧边栏 + 右侧内容 ---------- */
.product-layout { display: grid; grid-template-columns: 280px 1fr; gap: 32px; align-items: start; }
.anchor-nav {
  position: sticky; top: 100px;
  background: var(--bg-2); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 14px 10px; box-shadow: var(--shadow-sm);
}
.anchor-nav ul { list-style: none; }
.anchor-nav li { margin: 2px 0; }
.anchor-nav a {
  display: block; padding: 9px 14px; border-radius: 8px;
  font-size: 13.5px; color: var(--ink-2); font-weight: 500; transition: .15s;
}
.anchor-nav a:hover, .anchor-nav a.active { color: var(--blue); background: rgba(47,123,255,.09); }
.anchor-nav .anchor-title {
  font-size: 11px; font-weight: 700; letter-spacing: 2px; text-transform: uppercase;
  color: var(--muted); padding: 8px 14px 6px;
}

/* ---------- 产品头部卡（图 + 信息） ---------- */
.prod-head {
  background: var(--bg-2); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 20px; display: grid; grid-template-columns: 300px 1fr; gap: 26px; align-items: center;
}
.prod-head .ph-img {
  aspect-ratio: 1; border-radius: 10px; overflow: hidden;
  background: linear-gradient(135deg, #e8f0ff, #f0f9fb);
  display: flex; align-items: center; justify-content: center;
  font-size: 90px; border: 1px solid var(--line);
}
.prod-head h1 { font-size: clamp(22px, 2.6vw, 30px); font-weight: 800; color: var(--ink); line-height: 1.35; }
.prod-head .ph-en { font-size: 12px; letter-spacing: 2px; color: var(--blue); text-transform: uppercase; font-weight: 600; margin: 6px 0 12px; }
.prod-head p { font-size: 14.5px; color: var(--ink-2); line-height: 1.85; }
.prod-head .ph-actions { display: flex; gap: 12px; margin-top: 22px; flex-wrap: wrap; }
.dl-btn {
  display: inline-flex; align-items: center; gap: 8px;
  background: var(--grad); color: #fff !important;
  padding: 11px 22px; border-radius: 999px; font-size: 13.5px; font-weight: 600; transition: .2s;
}
.dl-btn:hover { box-shadow: 0 8px 24px rgba(47,123,255,.35); transform: translateY(-1px); }

/* ---------- 特性/应用列表 ---------- */
.feature-list, .app-list { list-style: none; display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 12px; }
.feature-list li, .app-list li {
  background: var(--card); border: 1px solid var(--line); border-radius: 10px;
  padding: 14px 16px; font-size: 14px; color: var(--ink-2);
  display: flex; align-items: flex-start; gap: 10px; box-shadow: var(--shadow-sm);
}
.feature-list li::before { content: "◆"; color: var(--blue-2); font-size: 10px; transform: translateY(3px); flex-shrink: 0; }
.app-list li::before { content: "✓"; color: var(--cyan); font-weight: 700; flex-shrink: 0; }

/* ---------- 产品详情区 ---------- */
.prod-section { margin-bottom: 44px; scroll-margin-top: 96px; }
.prod-section .content p { margin-bottom: 14px; }

/* ---------- FAQ 详情页样式（编号问答） ---------- */
.faq-num { counter-reset: faq; max-width: 860px; margin: 0 auto; display: grid; gap: 16px; }
.faq-num .fq-item {
  background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 22px 24px;
  box-shadow: var(--shadow-sm); counter-increment: faq;
}
.faq-num .fq-item h3 {
  font-size: 15.5px; font-weight: 700; color: var(--ink); margin-bottom: 10px;
  display: flex; gap: 10px;
}
.faq-num .fq-item h3::before {
  content: counter(faq) "."; color: var(--blue); font-weight: 800; flex-shrink: 0;
}
.faq-num .fq-item p { font-size: 14px; color: var(--ink-2); line-height: 1.9; }

/* ---------- 移动端适配 ---------- */
@media (max-width: 900px) {
  .product-layout { grid-template-columns: 1fr; }
  .anchor-nav { position: static; }
  .anchor-nav ul { display: flex; flex-wrap: wrap; gap: 4px; }
  .anchor-nav li { margin: 0; }
  .anchor-nav a { padding: 6px 12px; font-size: 12.5px; }
  .anchor-nav .anchor-title { display: none; }
  .prod-head { grid-template-columns: 1fr; }
  .prod-head .ph-img { max-width: 320px; }
}


/* ============================================================
   新增板块：B2B 认证条 / 客户评价 / 公司位置 / 企业资质
   ============================================================ */

/* ---------- B2B 认证条 ---------- */
.trust-strip {
  background: linear-gradient(120deg, #0d3a8f 0%, #1a5fd0 55%, #0e9aa7 100%);
  color: #fff; padding: 26px 0; position: relative; overflow: hidden;
}
.trust-strip::before {
  content: ""; position: absolute; inset: 0;
  background-image: radial-gradient(rgba(255,255,255,.18) 1px, transparent 1px);
  background-size: 22px 22px; opacity: .35;
}
.trust-strip-inner { position: relative; display: flex; align-items: center; justify-content: space-between; gap: 18px; flex-wrap: wrap; }
.trust-strip-head { font-size: 17px; font-weight: 700; letter-spacing: 1px; }
.trust-strip-items { display: flex; gap: 10px; flex-wrap: wrap; }
.trust-chip {
  background: rgba(255,255,255,.14); border: 1px solid rgba(255,255,255,.35);
  border-radius: 999px; padding: 7px 16px; font-size: 13px; backdrop-filter: blur(4px);
}
.trust-chip b { font-size: 15px; margin-right: 4px; }

/* ---------- 客户评价 ---------- */
.testi-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(270px, 1fr)); gap: 20px; }
.testi-card {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 26px 24px; box-shadow: var(--shadow-sm); display: flex; flex-direction: column; gap: 14px;
  transition: .25s; position: relative; overflow: hidden;
}
.testi-card::before { content: ""; position: absolute; top: 0; left: 0; right: 0; height: 4px; background: var(--grad); }
.testi-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.testi-stars { color: #f5a623; letter-spacing: 3px; font-size: 14px; }
.testi-quote { font-size: 14.5px; color: var(--ink-2); line-height: 1.9; }
.testi-foot { margin-top: auto; display: flex; align-items: center; justify-content: space-between; gap: 10px; border-top: 1px dashed var(--line); padding-top: 14px; }
.testi-tag { font-size: 11.5px; color: var(--blue); background: rgba(47,123,255,.08); border-radius: 999px; padding: 4px 12px; font-weight: 600; }
.testi-author { font-size: 12.5px; color: var(--muted); }

/* ---------- 公司位置 ---------- */
.map-grid { display: grid; grid-template-columns: 1.1fr 1fr; gap: 28px; align-items: stretch; }
.map-card {
  background: var(--bg-2); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 30px; display: flex; flex-direction: column; gap: 18px; box-shadow: var(--shadow-sm);
}
.map-addr { padding: 14px 16px; background: #fff; border: 1px solid var(--line); border-left: 4px solid var(--blue); border-radius: 10px; }
.map-label { font-size: 11px; letter-spacing: 2px; color: var(--blue); font-weight: 700; text-transform: uppercase; }
.map-addr h3 { font-size: 15px; font-weight: 700; color: var(--ink); margin: 6px 0 2px; line-height: 1.6; }
.map-addr p { font-size: 12.5px; color: var(--muted); }
.map-card .btn { align-self: flex-start; margin-top: auto; }
.map-visual {
  position: relative; border-radius: var(--radius); overflow: hidden; min-height: 300px;
  background: linear-gradient(160deg, #e8f2ff 0%, #d9ecf5 55%, #eaf7f8 100%);
  border: 1px solid var(--line);
}
.map-grid-bg {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(26,95,208,.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(26,95,208,.08) 1px, transparent 1px),
    linear-gradient(rgba(26,95,208,.05) 2px, transparent 2px),
    linear-gradient(90deg, rgba(26,95,208,.05) 2px, transparent 2px);
  background-size: 60px 60px, 60px 60px, 300px 300px, 300px 300px;
}
.map-route {
  position: absolute; top: 26%; left: 10%; width: 70%; height: 3px;
  background: linear-gradient(90deg, rgba(47,123,255,.55), rgba(14,154,167,.55));
  border-radius: 3px; transform: rotate(-14deg);
}
.map-route::before, .map-route::after {
  content: ""; position: absolute; width: 10px; height: 10px; background: #fff;
  border: 3px solid var(--blue-2); border-radius: 50%; top: -4px;
}
.map-route::before { left: 8%; }
.map-route::after { right: 12%; }
.map-pin { position: absolute; top: 36%; left: 50%; transform: translate(-50%, -50%); display: flex; flex-direction: column; align-items: center; gap: 8px; z-index: 2; }
.pin-dot {
  width: 26px; height: 26px; border-radius: 50% 50% 50% 0; transform: rotate(-45deg);
  background: var(--grad); box-shadow: 0 8px 22px rgba(47,123,255,.45);
  animation: pinFloat 2.4s ease-in-out infinite;
}
@keyframes pinFloat { 0%, 100% { transform: rotate(-45deg) translateY(0); } 50% { transform: rotate(-45deg) translateY(-8px); } }
.map-pin b { background: #fff; border: 1px solid var(--line); border-radius: 999px; padding: 6px 14px; font-size: 12.5px; color: var(--ink); box-shadow: var(--shadow-sm); white-space: nowrap; }
.map-note {
  position: absolute; bottom: 18px; left: 50%; transform: translateX(-50%);
  background: rgba(255,255,255,.9); backdrop-filter: blur(6px); border-radius: 999px;
  padding: 8px 18px; font-size: 12.5px; color: var(--ink-2); border: 1px solid var(--line);
  box-shadow: var(--shadow-sm); white-space: nowrap; z-index: 2;
}

/* ---------- 关于页资质 ---------- */
.cred-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 20px; }
.cred-item { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 24px; box-shadow: var(--shadow-sm); }
.cred-item h4 { font-size: 15px; font-weight: 700; color: var(--blue); margin-bottom: 12px; }
.cred-item ul { list-style: none; display: grid; gap: 8px; }
.cred-item li { font-size: 13.5px; color: var(--ink-2); padding-left: 18px; position: relative; }
.cred-item li::before { content: "✓"; position: absolute; left: 0; color: var(--cyan); font-weight: 700; }
.addr-note { margin-top: 22px; background: #fff8e6; border: 1px solid #f0dcae; border-radius: 10px; padding: 14px 18px; font-size: 13.5px; color: #7a5b12; line-height: 1.9; }

/* ---------- 联系卡片副标 ---------- */
.c-sub { font-size: 12px; color: var(--muted); margin-top: 4px; }

/* ---------- 移动端适配 ---------- */
@media (max-width: 900px) {
  .map-grid { grid-template-columns: 1fr; }
  .map-visual { min-height: 240px; }
  .trust-strip-head { font-size: 15px; }
}


/* ============================================================
   视觉增强：浮动光晕 / 按钮光泽 / 页面淡入
   ============================================================ */
.hero-orb {
  position: absolute; border-radius: 50%; filter: blur(70px); opacity: .5; pointer-events: none;
  animation: orbFloat 14s ease-in-out infinite;
}
.hero-orb.o1 { width: 420px; height: 420px; right: 6%; top: 8%; background: radial-gradient(circle, rgba(47,123,255,.35), transparent 70%); }
.hero-orb.o2 { width: 340px; height: 340px; left: 2%; bottom: 4%; background: radial-gradient(circle, rgba(14,154,167,.30), transparent 70%); animation-delay: -5s; }
.hero-orb.o3 { width: 200px; height: 200px; left: 42%; top: 55%; background: radial-gradient(circle, rgba(77,148,255,.28), transparent 70%); animation-delay: -9s; }
@keyframes orbFloat { 0%, 100% { transform: translate(0, 0) scale(1); } 33% { transform: translate(24px, -30px) scale(1.08); } 66% { transform: translate(-18px, 18px) scale(.95); } }

.btn-primary, .btn { position: relative; overflow: hidden; }
.btn-primary::after, .nav-cta::after, .dl-btn::after {
  content: ""; position: absolute; top: 0; left: -120%; width: 60%; height: 100%;
  background: linear-gradient(100deg, transparent, rgba(255,255,255,.45), transparent);
  transform: skewX(-20deg); transition: left .6s;
}
.btn-primary:hover::after, .nav-cta:hover::after, .dl-btn:hover::after { left: 160%; }



/* ============================================================
   Hero 双栏：左侧文案 + 右侧产品视觉
   ============================================================ */
.hero-split { display: grid; grid-template-columns: 1.05fr 0.95fr; gap: 48px; align-items: center; }
.hero-main { min-width: 0; }

.hero-visual { position: relative; min-height: 460px; }
.hv-main {
  position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%);
  width: min(360px, 92%); background: rgba(255,255,255,.92);
  border: 1px solid var(--line); border-radius: 22px; padding: 22px;
  box-shadow: 0 30px 70px rgba(20,33,61,.16);
  backdrop-filter: blur(8px); z-index: 2;
  animation: hvMainFloat 6s ease-in-out infinite;
}
@keyframes hvMainFloat { 0%, 100% { transform: translate(-50%, -50%); } 50% { transform: translate(-50%, calc(-50% - 10px)); } }
.hv-membrane {
  position: relative; border-radius: 16px; overflow: hidden;
  background: linear-gradient(150deg, #f0f6ff, #e8f7fa);
  border: 1px solid var(--line);
}
.hv-svg { width: 100%; height: auto; display: block; }
.hv-chip {
  position: absolute; top: 14px; left: 14px;
  background: var(--grad); color: #fff; font-size: 12px; font-weight: 700;
  padding: 6px 14px; border-radius: 999px; letter-spacing: .5px;
  box-shadow: 0 6px 16px rgba(47,123,255,.35);
}
.hv-specs { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 10px; margin-top: 16px; }
.hv-specs span {
  background: var(--bg-2); border: 1px solid var(--line); border-radius: 10px;
  padding: 10px 6px; text-align: center; font-size: 11.5px; color: var(--muted); line-height: 1.5;
}
.hv-specs b { display: block; font-size: 14px; color: var(--blue); font-weight: 800; }

.hv-float {
  position: absolute; background: rgba(255,255,255,.94); border: 1px solid var(--line);
  border-radius: 14px; padding: 12px 16px; font-size: 12.5px; color: var(--ink-2);
  box-shadow: 0 16px 40px rgba(20,33,61,.12); backdrop-filter: blur(6px);
  line-height: 1.6; z-index: 3; white-space: nowrap;
}
.hv-float b { color: var(--blue); font-size: 13.5px; }
.hv-f1 { top: 4%; left: -4%; animation: hvF1 7s ease-in-out infinite; }
.hv-f2 { top: 16%; right: -6%; animation: hvF2 8s ease-in-out infinite; }
.hv-f3 { bottom: 12%; left: -8%; animation: hvF3 7.5s ease-in-out infinite; }
.hv-f4 { bottom: 0; right: 0; animation: hvF4 8.5s ease-in-out infinite; }
@keyframes hvF1 { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-12px); } }
@keyframes hvF2 { 0%, 100% { transform: translateY(-6px); } 50% { transform: translateY(8px); } }
@keyframes hvF3 { 0%, 100% { transform: translateY(4px); } 50% { transform: translateY(-10px); } }
@keyframes hvF4 { 0%, 100% { transform: translateY(-8px); } 50% { transform: translateY(6px); } }

@media (max-width: 1000px) {
  .hero-split { grid-template-columns: 1fr; gap: 24px; }
  .hero-visual { min-height: 380px; order: 2; margin-top: 10px; }
  .hero-main { order: 1; text-align: center; }
  .hero-main .hero-sub { margin-left: auto; margin-right: auto; }
  .hero-actions { justify-content: center; }
  .hero-metrics { justify-content: center; }
}
@media (max-width: 560px) {
  .hero-visual { min-height: 320px; }
  .hv-float { font-size: 11px; padding: 9px 12px; }
  .hv-f1 { left: 0; } .hv-f2 { right: 0; } .hv-f3 { left: 0; } .hv-f4 { right: 0; }
}


/* ---------- 板块标题双栏（左标题 + 右说明/入口） ---------- */
.section-head.split {
  display: flex; align-items: flex-end; justify-content: space-between;
  gap: 40px; max-width: 100%;
}
.section-head.split .sh-main { min-width: 0; flex: 0 1 auto; }
.section-head.split .sh-main h2 { margin: 14px 0 0; }
.section-head.split .sh-side { max-width: 470px; text-align: right; flex-shrink: 0; }
.section-head.split .sh-side p { margin: 0 0 14px; }
.sh-more {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 14px; font-weight: 600; color: var(--blue);
  border-bottom: 1px solid transparent; transition: .2s; padding-bottom: 2px;
}
.sh-more:hover { gap: 10px; border-bottom-color: rgba(47,123,255,.5); }
@media (max-width: 860px) {
  .section-head.split { flex-direction: column; align-items: flex-start; gap: 16px; }
  .section-head.split .sh-side { text-align: left; max-width: 100%; }
}


/* ============================================================
   痛点解决方案板块 / 行业解决方案板块
   ============================================================ */
.pain-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 20px; }
.pain-card {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 26px 24px; box-shadow: var(--shadow-sm); transition: .25s; position: relative; overflow: hidden;
  display: flex; flex-direction: column; gap: 8px;
}
.pain-card::after {
  content: ""; position: absolute; right: -34px; top: -34px; width: 90px; height: 90px; border-radius: 50%;
  background: radial-gradient(circle, rgba(47,123,255,.10), transparent 70%);
}
.pain-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.p-ico { font-size: 30px; line-height: 1; }
.pain-card h3 { font-size: 17px; font-weight: 800; color: var(--ink); margin: 4px 0 0; }
.p-pain { font-size: 12.5px; color: var(--muted); }
.p-sol { font-size: 14px; color: var(--ink-2); line-height: 1.85; flex: 1; }
.p-sol b { color: var(--blue); }
.p-link { align-self: flex-start; font-size: 13px; font-weight: 600; color: var(--blue); border-bottom: 1px dashed rgba(47,123,255,.4); }
.p-link:hover { color: var(--blue-2); }

/* 产品卡痛点前置 */
.p-problem { font-size: 12.5px; color: var(--cyan); font-weight: 600; margin-bottom: 2px; }

/* 行业解决方案 */
.ind-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); gap: 18px; }
.ind-card {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 26px 22px; transition: .25s; display: flex; flex-direction: column; gap: 8px;
  box-shadow: var(--shadow-sm);
}
.ind-card:hover { transform: translateY(-5px); box-shadow: var(--shadow); border-color: rgba(47,123,255,.35); }
.i-ico { font-size: 30px; }
.ind-card h3 { font-size: 16.5px; font-weight: 800; color: var(--ink); }
.ind-card p { font-size: 13px; color: var(--muted); flex: 1; }
.i-sol {
  display: inline-block; align-self: flex-start; font-size: 12px; font-weight: 600; color: var(--blue);
  background: rgba(47,123,255,.08); border-radius: 999px; padding: 5px 12px;
}
@media (max-width: 560px) {
  .ind-grid { grid-template-columns: 1fr 1fr; }
}


/* ---------- 产品页：解决什么问题 ---------- */
.problem-card {
  background: var(--bg-2); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 24px; display: grid; gap: 14px; box-shadow: var(--shadow-sm);
}
.pb-row {
  display: flex; gap: 16px; align-items: flex-start;
  background: #fff; border: 1px solid var(--line); border-left: 4px solid #e05656;
  border-radius: 10px; padding: 16px 18px;
}
.pb-row.pb-sol { border-left-color: var(--cyan); }
.pb-label {
  flex-shrink: 0; font-size: 12px; font-weight: 700; color: #e05656;
  background: rgba(224,86,86,.08); border-radius: 999px; padding: 4px 12px; margin-top: 2px;
}
.pb-label-green { color: var(--cyan); background: rgba(14,154,167,.10); }
.pb-row p { font-size: 14.5px; color: var(--ink-2); line-height: 1.9; }
.pb-arrow { text-align: center; font-size: 13px; font-weight: 700; color: var(--blue); letter-spacing: 2px; }
.pb-note { margin-top: 14px; font-size: 13px; color: var(--muted); }


/* ---------- 语言切换 ---------- */
.lang-switch { margin-left: 8px; }
.lang-switch button {
  background: transparent; border: 1px solid var(--line-2); border-radius: 999px;
  color: var(--ink-2); font-size: 12.5px; font-weight: 700; letter-spacing: 1px;
  padding: 8px 16px; cursor: pointer; transition: .2s; font-family: var(--font);
}
.lang-switch button:hover { color: var(--blue); border-color: var(--blue-2); background: rgba(47,123,255,.06); }
@media (max-width: 1000px) {
  .lang-switch { margin: 10px 0 0; }
}

/* 产品图片 */
.p-icon img { width: 100%; height: 100%; object-fit: cover; border-radius: 12px; display: block; }
.ph-img img { width: 100%; height: 100%; object-fit: cover; }