/* ============================================================
   JWVS 洁卫森 — Autonomous Cleaning Robots
   ============================================================ */
:root{
  --brand:#0E5AA7;          /* deep blue */
  --brand-d:#0A4584;
  --teal:#16A6C4;           /* teal accent */
  --green:#28A35B;          /* green accent */
  --ink:#0F2440;            /* heading navy */
  --body:#42526B;           /* body text */
  --muted:#76859C;
  --line:#E3EAF3;
  --bg:#ffffff;
  --bg-soft:#F4F8FD;
  --bg-dark:#0B1D38;
  --radius:18px;
  --radius-sm:12px;
  --shadow:0 18px 50px -22px rgba(15,36,64,.30);
  --shadow-sm:0 10px 30px -18px rgba(15,36,64,.45);
  --max:1180px;
  --grad:linear-gradient(105deg,var(--teal),var(--brand) 60%);
  --font:"PingFang SC","Microsoft YaHei","Hiragino Sans GB","Noto Sans SC",
         -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;scroll-padding-top:78px;-webkit-text-size-adjust:100%}
body{font-family:var(--font);color:var(--body);background:var(--bg);line-height:1.65;
  font-size:16px;overflow-x:hidden;-webkit-font-smoothing:antialiased}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
h1,h2,h3,h4,h5{color:var(--ink);line-height:1.18;font-weight:800;letter-spacing:-.01em}
.container{width:100%;max-width:var(--max);margin:0 auto;padding:0 24px}

/* ---------- Buttons ---------- */
.btn{display:inline-flex;align-items:center;gap:.5em;font-weight:700;font-size:15px;
  padding:13px 26px;border-radius:999px;cursor:pointer;border:0;transition:.25s;white-space:nowrap}
.btn-primary{background:var(--grad);color:#fff;box-shadow:0 12px 26px -10px rgba(14,90,167,.6)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 18px 34px -10px rgba(14,90,167,.7)}
.btn-ghost{background:rgba(255,255,255,.12);color:#fff;border:1.5px solid rgba(255,255,255,.55);backdrop-filter:blur(4px)}
.btn-ghost:hover{background:rgba(255,255,255,.22)}
.btn-outline{background:#fff;color:var(--brand);border:1.5px solid var(--brand)}
.btn-outline:hover{background:var(--brand);color:#fff}
.btn-block{width:100%;justify-content:center;margin-top:6px}

/* ---------- Section scaffolding ---------- */
.section{padding:96px 0}
.section.slim{padding:80px 0}
.section-soft{background:var(--bg-soft)}
.section-head{max-width:760px;margin:0 auto 56px;text-align:center}
.section-head h2{font-size:clamp(26px,3.6vw,40px);margin:8px 0 14px}
.section-lead{color:var(--muted);font-size:17px}
.eyebrow{display:inline-block;font-size:13px;font-weight:800;letter-spacing:.16em;
  text-transform:uppercase;color:var(--brand);
  padding:6px 14px;border-radius:999px;background:rgba(14,90,167,.08)}
.eyebrow.light{color:#9fd8ec;background:rgba(255,255,255,.1)}
.grad{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.sub-head{font-size:22px;margin:54px 0 26px;text-align:center}

/* ============================================================
   HEADER / NAV
   ============================================================ */
.site-header{position:fixed;top:0;left:0;right:0;z-index:100;transition:.3s;
  background:rgba(255,255,255,0);padding:18px 0}
.site-header.scrolled{background:rgba(255,255,255,.92);backdrop-filter:blur(12px);
  padding:10px 0;box-shadow:0 6px 24px -16px rgba(15,36,64,.5)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;gap:24px}
.brand{display:flex;align-items:center;gap:11px}
.brand-logo{display:block;height:38px;width:auto;background:#fff;border-radius:8px;
  padding:6px 12px;box-shadow:0 2px 10px -4px rgba(7,28,56,.35);transition:height .3s}
.scrolled .brand-logo{height:34px;box-shadow:none}
.brand-mark{display:grid;place-items:center}
.brand-text strong{display:flex;align-items:center;gap:7px;font-size:20px;color:#fff;font-weight:900;letter-spacing:.02em}
.brand-cn{font-size:16px;font-weight:800}
.brand-text small{display:block;font-size:11px;letter-spacing:.22em;color:rgba(255,255,255,.7);margin-top:-2px}
.scrolled .brand-text strong{color:var(--ink)}
.scrolled .brand-text small{color:var(--muted)}

.main-nav{display:flex;align-items:center;gap:30px}
.main-nav a{font-size:15px;font-weight:600;color:rgba(255,255,255,.92);transition:.2s;position:relative}
.main-nav a:not(.nav-cta)::after{content:"";position:absolute;left:0;bottom:-6px;width:0;height:2px;
  background:var(--teal);transition:.25s}
.main-nav a:not(.nav-cta):hover::after,.main-nav a.active::after{width:100%}
.scrolled .main-nav a{color:var(--ink)}
.nav-cta{background:var(--grad);color:#fff!important;padding:9px 20px;border-radius:999px;
  box-shadow:0 10px 22px -10px rgba(14,90,167,.6)}
.nav-cta:hover{transform:translateY(-2px)}
.nav-toggle{display:none;flex-direction:column;gap:5px;background:none;border:0;cursor:pointer;padding:8px}
.nav-toggle span{width:26px;height:2.5px;background:#fff;border-radius:2px;transition:.3s}
.scrolled .nav-toggle span{background:var(--ink)}

/* ============================================================
   HERO
   ============================================================ */
.hero{position:relative;min-height:100vh;display:flex;align-items:center;overflow:hidden;color:#fff}
.hero-bg{position:absolute;inset:0;background-size:cover;background-position:center;transform:scale(1.05)}
.hero-overlay{position:absolute;inset:0;
  background:linear-gradient(100deg,rgba(7,28,56,.92) 0%,rgba(8,38,72,.74) 42%,rgba(10,55,90,.30) 100%)}
.hero-content{position:relative;z-index:2;padding:120px 24px 90px;max-width:820px}
.hero h1{color:#fff;font-size:clamp(40px,6.2vw,72px);font-weight:900;margin:18px 0 22px;letter-spacing:-.02em}
.hero-sub{font-size:clamp(16px,2vw,19px);color:rgba(255,255,255,.9);max-width:620px;margin-bottom:34px}
.hero-actions{display:flex;gap:16px;flex-wrap:wrap;margin-bottom:56px}
.hero-stats{list-style:none;display:flex;flex-wrap:wrap;gap:14px 40px;border-top:1px solid rgba(255,255,255,.2);padding-top:30px}
.hero-stats li{display:flex;flex-direction:column}
.hero-stats strong{font-size:34px;font-weight:900;background:linear-gradient(90deg,#fff,#9fd8ec);
  -webkit-background-clip:text;background-clip:text;color:transparent;line-height:1}
.hero-stats span{font-size:13px;color:rgba(255,255,255,.78);margin-top:6px}
.scroll-cue{position:absolute;bottom:26px;left:50%;transform:translateX(-50%);z-index:2;
  width:26px;height:42px;border:2px solid rgba(255,255,255,.55);border-radius:14px}
.scroll-cue span{position:absolute;top:8px;left:50%;transform:translateX(-50%);width:4px;height:8px;
  background:#fff;border-radius:2px;animation:cue 1.6s infinite}
@keyframes cue{0%{opacity:0;top:8px}40%{opacity:1}80%{opacity:0;top:22px}100%{opacity:0}}

/* ============================================================
   TRUST / LOGOS
   ============================================================ */
.trust{padding:40px 0;border-bottom:1px solid var(--line);background:#fff}
.trust-label{text-align:center;font-size:13px;letter-spacing:.14em;color:var(--muted);text-transform:uppercase;margin-bottom:18px}
.logo-row{display:flex;flex-wrap:wrap;justify-content:center;gap:14px 34px}
.logo-row span{font-size:17px;font-weight:800;color:#9aa8bd;letter-spacing:.02em;transition:.25s;white-space:nowrap}
.logo-row span:hover{color:var(--brand)}

/* ============================================================
   PRODUCTS
   ============================================================ */
.product{display:grid;grid-template-columns:1fr 1fr;gap:54px;align-items:center;margin-bottom:80px}
.product:last-child{margin-bottom:0}
.product.reverse .product-media{order:2}
.product-media{position:relative;border-radius:var(--radius);overflow:hidden;
  aspect-ratio:4/3.2;display:grid;place-items:center;padding:30px;box-shadow:var(--shadow)}
.product-media.light{background:radial-gradient(120% 120% at 70% 20%,#eaf3fc,#cfe0f3)}
.product-media.dark{background:radial-gradient(120% 120% at 70% 20%,#1b3050,#0a1626)}
.product-media img{max-height:100%;width:auto;filter:drop-shadow(0 26px 30px rgba(0,0,0,.4));
  transition:.5s;transform:translateY(0)}
.product-media:hover img{transform:translateY(-8px) scale(1.02)}
.tag{position:absolute;top:18px;left:18px;font-size:12px;font-weight:800;letter-spacing:.05em;
  padding:6px 13px;border-radius:999px;z-index:2}
.tag-out{background:rgba(40,163,91,.16);color:#1c7a42;border:1px solid rgba(40,163,91,.4)}
.tag-in{background:rgba(22,166,196,.2);color:#bdeefb;border:1px solid rgba(22,166,196,.5)}
.product-info h3{font-size:clamp(28px,3.4vw,38px)}
.product-info h3 small{font-size:18px;color:var(--muted);font-weight:700}
.product-tagline{color:var(--teal);font-weight:800;font-size:17px;margin:8px 0 14px}
.product-info>p{color:var(--body);margin-bottom:20px}
.tech-bullets{list-style:none;margin-bottom:22px}
.tech-bullets li{position:relative;padding-left:26px;margin-bottom:9px;font-weight:600;color:var(--ink)}
.tech-bullets li::before{content:"";position:absolute;left:0;top:9px;width:13px;height:13px;border-radius:50%;
  background:var(--grad)}
.spec-chips{list-style:none;display:flex;flex-wrap:wrap;gap:10px}
.spec-chips li{background:var(--bg-soft);border:1px solid var(--line);border-radius:12px;
  padding:9px 14px;font-size:13px;color:var(--muted);font-weight:600}
.spec-chips li b{display:block;font-size:17px;color:var(--brand);font-weight:900}

/* ============================================================
   TECHNOLOGY (dark)
   ============================================================ */
.section-dark{position:relative;background:var(--bg-dark);color:#cfdcec;overflow:hidden}
.section-dark h2,.section-dark h3,.section-dark h4{color:#fff}
.section-lead.light{color:#9fb2cc}
.tech-bg{position:absolute;inset:0;background-size:cover;background-position:center;opacity:.16}
.section-dark .container{position:relative;z-index:1}
.tech-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.tech-card{background:rgba(255,255,255,.04);border:1px solid rgba(255,255,255,.1);border-radius:var(--radius);
  padding:30px 26px;transition:.3s}
.tech-card:hover{background:rgba(22,166,196,.1);border-color:rgba(22,166,196,.4);transform:translateY(-5px)}
.tech-ic{display:grid;place-items:center;width:52px;height:52px;border-radius:14px;
  background:var(--grad);font-size:26px;color:#fff;margin-bottom:18px}
.tech-card h4{font-size:19px;margin-bottom:10px}
.tech-card p{font-size:14.5px;color:#9fb2cc}

.platform{margin-top:64px;background:rgba(255,255,255,.04);border:1px solid rgba(255,255,255,.1);
  border-radius:24px;padding:44px}
.platform-head{text-align:center;max-width:640px;margin:0 auto 34px}
.platform-head h3{font-size:26px;margin-bottom:8px}
.platform-head p{color:#9fb2cc}
.platform-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;align-items:end}
.platform-shot{text-align:center}
.platform-shot img{margin:0 auto 16px;max-height:170px;width:auto;border-radius:10px;
  background:#fff;padding:8px;box-shadow:0 18px 40px -20px rgba(0,0,0,.7)}
.platform-shot figcaption{font-size:13.5px;color:#9fb2cc}
.platform-shot figcaption b{display:block;color:var(--teal);font-size:16px;margin-bottom:3px}

/* ============================================================
   SOLUTIONS
   ============================================================ */
.sol-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:26px;margin-bottom:60px}
.sol-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;
  box-shadow:var(--shadow-sm);transition:.3s}
.sol-card:hover{transform:translateY(-6px);box-shadow:var(--shadow)}
.sol-img{height:190px;background-size:cover;background-position:center}
.sol-body{padding:26px}
.sol-body h3{font-size:21px;margin-bottom:10px}
.sol-body p{font-size:14.5px;color:var(--muted);margin-bottom:14px}
.sol-body ul{list-style:none;display:flex;flex-direction:column;gap:7px}
.sol-body li{font-size:14px;font-weight:600;color:var(--brand);padding-left:18px;position:relative}
.sol-body li::before{content:"›";position:absolute;left:0;color:var(--teal);font-weight:900}

.scenarios{text-align:center;margin-bottom:64px}
.scen-label{font-weight:800;color:var(--ink);font-size:18px;margin-bottom:20px}
.scen-chips{display:flex;flex-wrap:wrap;justify-content:center;gap:12px}
.scen-chips span{background:#fff;border:1px solid var(--line);border-radius:999px;padding:10px 18px;
  font-size:14px;font-weight:600;color:var(--body);box-shadow:var(--shadow-sm);transition:.25s}
.scen-chips span:hover{border-color:var(--teal);color:var(--brand);transform:translateY(-3px)}

.loop{background:var(--grad);border-radius:24px;padding:50px;color:#fff;text-align:center}
.loop>h3{color:#fff;font-size:clamp(20px,2.6vw,28px);margin-bottom:34px}
.loop-grid{display:flex;align-items:stretch;justify-content:center;gap:18px;flex-wrap:wrap;margin-bottom:30px}
.loop-node{background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.25);border-radius:16px;
  padding:24px;flex:1;min-width:200px;max-width:300px;backdrop-filter:blur(4px)}
.loop-node b{font-size:30px;font-weight:900;opacity:.7}
.loop-node h4{color:#fff;font-size:18px;margin:6px 0 8px}
.loop-node p{font-size:13.5px;color:rgba(255,255,255,.85)}
.loop-arrow{display:grid;place-items:center;font-size:26px;color:rgba(255,255,255,.7)}
.loop-tags{list-style:none;display:flex;flex-wrap:wrap;justify-content:center;gap:12px}
.loop-tags li{background:rgba(255,255,255,.18);border-radius:999px;padding:8px 18px;font-weight:700;font-size:14px}

/* ============================================================
   ADVANTAGES / ROI
   ============================================================ */
.adv-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;margin-bottom:64px}
.adv-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:30px;
  box-shadow:var(--shadow-sm);transition:.3s}
.adv-card:hover{transform:translateY(-5px);box-shadow:var(--shadow);border-color:rgba(22,166,196,.4)}
.adv-ic{display:grid;place-items:center;width:54px;height:54px;border-radius:14px;
  background:linear-gradient(135deg,rgba(22,166,196,.16),rgba(14,90,167,.16));font-size:26px;margin-bottom:16px}
.adv-card h4{font-size:19px;margin-bottom:9px}
.adv-card p{font-size:14.5px;color:var(--muted)}

.roi{background:var(--bg-dark);border-radius:24px;padding:48px;color:#fff}
.roi-head{text-align:center;margin-bottom:34px}
.roi-head h3{color:#fff;font-size:26px;margin-bottom:6px}
.roi-head p{color:#9fb2cc}
.roi-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.roi-card{background:rgba(255,255,255,.05);border:1px solid rgba(255,255,255,.12);border-radius:16px;padding:28px;text-align:center}
.roi-case{font-size:14px;color:#9fd8ec;font-weight:700;letter-spacing:.04em;margin-bottom:14px}
.roi-big{display:flex;flex-direction:column;align-items:center;margin-bottom:14px}
.roi-big span{font-size:54px;font-weight:900;line-height:1;
  background:linear-gradient(90deg,#16A6C4,#43d39a);-webkit-background-clip:text;background-clip:text;color:transparent}
.roi-big{font-size:13px;color:#9fb2cc;gap:4px}
.roi-detail{font-size:13.5px;color:#b9c7da}
.roi-detail b{color:#fff}

/* ============================================================
   ABOUT / TEAM
   ============================================================ */
.vm-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin-bottom:24px}
.vm-card{background:var(--bg-soft);border:1px solid var(--line);border-radius:var(--radius);padding:32px}
.vm-card h3{font-size:20px;margin-bottom:12px;display:flex;align-items:center;gap:10px}
.vm-card h3::before{content:"";width:8px;height:24px;border-radius:4px;background:var(--grad)}
.vm-card p{color:var(--muted);font-size:15px}
.vm-card.highlight{background:var(--grad);color:#fff}
.vm-card.highlight h3{color:#fff}.vm-card.highlight h3::before{background:#fff}
.vm-list{list-style:none}
.vm-list li{padding:7px 0 7px 24px;position:relative;font-weight:600}
.vm-list li::before{content:"✓";position:absolute;left:0;font-weight:900}

.team-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.team-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:26px;
  box-shadow:var(--shadow-sm);transition:.3s}
.team-card:hover{transform:translateY(-5px);box-shadow:var(--shadow)}
.team-av{width:58px;height:58px;border-radius:50%;background:var(--grad);color:#fff;
  display:grid;place-items:center;font-size:26px;font-weight:800;margin-bottom:16px}
.team-card h4{font-size:18px;margin-bottom:8px}
.team-card h4 small{font-weight:700;color:var(--teal);font-size:13px}
.team-card p{font-size:13.5px;color:var(--muted)}

.expert-row{display:grid;grid-template-columns:repeat(5,1fr);gap:16px}
.expert{background:var(--bg-soft);border:1px solid var(--line);border-radius:var(--radius-sm);padding:20px;text-align:center}
.expert b{display:block;font-size:17px;color:var(--ink)}
.expert span{display:block;font-size:12px;color:var(--muted);margin:8px 0}
.expert em{font-style:normal;font-size:12px;font-weight:800;color:var(--brand);
  background:rgba(14,90,167,.08);padding:4px 10px;border-radius:999px;display:inline-block}

.about-stats{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;margin-top:54px;
  background:var(--bg-soft);border-radius:20px;padding:40px}
.about-stats div{text-align:center}
.about-stats strong{display:block;font-size:42px;font-weight:900;
  background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent;line-height:1}
.about-stats span{font-size:14px;color:var(--muted);margin-top:8px;display:block}
.cred-block{display:flex;align-items:center;justify-content:space-between;gap:28px;flex-wrap:wrap;
  margin-top:28px;padding:32px 40px;border:1px solid var(--line);border-radius:20px;background:#fff}
.cred-block .eyebrow{margin-bottom:10px}
.cred-block h3{font-size:22px;margin-bottom:8px}
.cred-block .cred-text p:last-child{color:var(--muted);font-size:15px;max-width:640px}
.cred-block .btn{flex-shrink:0}

/* ============================================================
   ROADMAP (timeline)
   ============================================================ */
.timeline{list-style:none;position:relative;max-width:820px;margin:0 auto;padding-left:0}
.timeline::before{content:"";position:absolute;left:54px;top:6px;bottom:6px;width:2px;background:rgba(255,255,255,.18)}
.timeline li{position:relative;display:flex;gap:30px;padding:0 0 34px 0}
.timeline li:last-child{padding-bottom:0}
.tl-year{flex:0 0 auto;width:110px;text-align:right;font-size:24px;font-weight:900;
  background:linear-gradient(90deg,#9fd8ec,#16A6C4);-webkit-background-clip:text;background-clip:text;color:transparent;
  position:relative}
.tl-year::after{content:"";position:absolute;right:-29px;top:6px;width:14px;height:14px;border-radius:50%;
  background:var(--teal);box-shadow:0 0 0 4px rgba(22,166,196,.25)}
.tl-body{padding-top:2px}
.tl-body h4{font-size:18px;margin-bottom:5px}
.tl-body p{color:#9fb2cc;font-size:15px}

/* ============================================================
   CTA / CONTACT
   ============================================================ */
.cta{position:relative;color:#fff;overflow:hidden}
.cta-bg{position:absolute;inset:0;background-size:cover;background-position:center}
.cta-overlay{position:absolute;inset:0;background:linear-gradient(100deg,rgba(8,28,56,.95),rgba(11,40,72,.7))}
.cta-content{position:relative;z-index:2;display:grid;grid-template-columns:1fr 440px;gap:56px;
  align-items:center;padding:96px 24px}
.cta-text h2{color:#fff;font-size:clamp(28px,4vw,44px);margin:16px 0 18px}
.cta-text>p{color:rgba(255,255,255,.85);max-width:480px;margin-bottom:28px}
.contact-list{list-style:none;display:flex;flex-direction:column;gap:14px}
.contact-list li{display:flex;align-items:center;gap:12px;font-size:17px;font-weight:600}
.contact-list a:hover{color:#9fd8ec}
.cta-form{background:#fff;border-radius:24px;padding:36px;color:var(--body);box-shadow:var(--shadow)}
.cta-form h3{font-size:22px;margin-bottom:22px}
.field{margin-bottom:16px}
.field label{display:block;font-size:13px;font-weight:700;color:var(--ink);margin-bottom:7px}
.field input,.field select,.field textarea{width:100%;border:1.5px solid var(--line);border-radius:11px;
  padding:12px 14px;font-family:inherit;font-size:15px;color:var(--ink);background:var(--bg-soft);transition:.2s;resize:vertical}
.field input:focus,.field select:focus,.field textarea:focus{outline:0;border-color:var(--teal);
  background:#fff;box-shadow:0 0 0 3px rgba(22,166,196,.15)}
.form-note{margin-top:14px;text-align:center;color:var(--green);font-weight:700;font-size:14px}

/* ============================================================
   FOOTER
   ============================================================ */
.site-footer{background:#071728;color:#8ea2bd;padding:64px 0 28px}
.footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1.2fr;gap:40px;padding-bottom:44px;
  border-bottom:1px solid rgba(255,255,255,.08)}
.footer-brand .brand{margin-bottom:18px}
.footer-brand .brand-logo{height:36px;box-shadow:none}
.footer-brand .brand-text strong{color:#fff;font-size:19px}
.footer-brand p{font-size:14px;line-height:1.8;margin-bottom:10px}
.footer-slogan{color:var(--teal)!important;font-weight:700;letter-spacing:.04em}
.footer-col h5{color:#fff;font-size:15px;margin-bottom:16px}
.footer-col a,.footer-col span{display:block;font-size:14px;margin-bottom:10px;transition:.2s}
.footer-col a:hover{color:#9fd8ec}
.footer-bottom{display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;padding-top:24px;font-size:13px;color:#647c99}
.footer-beian{display:inline-flex;align-items:center;flex-wrap:wrap;gap:6px 18px}
.footer-beian a{display:inline-flex;align-items:center;gap:6px;color:inherit;text-decoration:none}
.footer-beian a:hover{color:var(--teal)}
.footer-beian img{display:inline-block;vertical-align:middle}

/* ============================================================
   FAQ
   ============================================================ */
.faq-tools{max-width:760px;margin:0 auto 36px}
.faq-search{position:relative;margin-bottom:20px}
.faq-search input{width:100%;border:1.5px solid var(--line);border-radius:999px;
  background:#fff url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='18' height='18' viewBox='0 0 24 24' fill='none' stroke='%2376859C' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Ccircle cx='11' cy='11' r='8'/%3E%3Cpath d='m21 21-4.35-4.35'/%3E%3C/svg%3E") 20px center/18px no-repeat;
  padding:15px 22px 15px 50px;font-family:inherit;font-size:15px;color:var(--ink);
  box-shadow:var(--shadow-sm);transition:.2s}
.faq-search input::placeholder{color:var(--muted)}
.faq-search input:focus{outline:0;border-color:var(--teal);box-shadow:0 0 0 4px rgba(22,166,196,.14)}
.faq-filters{display:flex;flex-wrap:wrap;justify-content:center;gap:10px}
.faq-chip{background:#fff;border:1.5px solid var(--line);border-radius:999px;padding:9px 22px;
  font-family:inherit;font-size:14px;font-weight:700;color:var(--body);cursor:pointer;transition:.22s}
.faq-chip:hover{border-color:var(--teal);color:var(--brand);transform:translateY(-2px)}
.faq-chip.active{background:var(--grad);border-color:transparent;color:#fff;box-shadow:0 10px 22px -12px rgba(14,90,167,.6)}

.faq-list{max-width:820px;margin:0 auto;display:flex;flex-direction:column;gap:14px}
.faq-item{position:relative;background:#fff;border:1px solid var(--line);border-radius:14px;
  box-shadow:var(--shadow-sm);overflow:hidden;transition:border-color .25s,box-shadow .25s,transform .25s}
.faq-item:hover{border-color:rgba(22,166,196,.45);transform:translateY(-2px)}
.faq-item[open]{border-color:rgba(22,166,196,.5);box-shadow:var(--shadow)}
.faq-item::before{content:"";position:absolute;left:0;top:0;bottom:0;width:4px;background:var(--grad);
  transform:scaleY(0);transform-origin:top;transition:transform .3s}
.faq-item[open]::before{transform:scaleY(1)}
.faq-item.faq-hidden{display:none}
.faq-item summary{list-style:none;cursor:pointer;display:flex;align-items:center;justify-content:space-between;
  gap:18px;padding:22px 26px;font-size:16.5px;font-weight:700;color:var(--ink);transition:color .2s}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{content:"";flex:0 0 auto;width:30px;height:30px;border-radius:50%;
  background:var(--bg-soft) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='14' height='14' viewBox='0 0 24 24' fill='none' stroke='%230E5AA7' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E") center/14px no-repeat;
  transition:transform .3s,background-color .3s}
.faq-item[open] summary::after{transform:rotate(180deg);background-color:rgba(22,166,196,.16)}
.faq-item summary:hover{color:var(--brand)}
.faq-a{padding:0 26px 24px;color:var(--body)}
.faq-item[open] .faq-a{animation:faqOpen .28s ease}
@keyframes faqOpen{from{opacity:0;transform:translateY(-6px)}to{opacity:1;transform:none}}
.faq-a p{font-size:15px;line-height:1.8}
.faq-a a{color:var(--brand);font-weight:700}
.faq-a b{color:var(--ink)}
.faq-inline-link{color:var(--brand);font-weight:700}
.faq-empty{text-align:center;color:var(--muted);margin-top:26px}
.faq-empty a{color:var(--brand);font-weight:700}

/* ============================================================
   SCROLL REVEAL
   ============================================================ */
.reveal{opacity:0;transform:translateY(28px);transition:opacity .7s ease,transform .7s ease}
.reveal.visible{opacity:1;transform:none}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width:980px){
  .tech-grid,.sol-cards,.adv-grid,.roi-cards,.platform-grid{grid-template-columns:repeat(2,1fr)}
  .team-grid{grid-template-columns:repeat(2,1fr)}
  .expert-row{grid-template-columns:repeat(3,1fr)}
  .vm-grid{grid-template-columns:1fr}
  .cta-content{grid-template-columns:1fr;gap:36px}
  .about-stats{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:820px){
  .main-nav{position:fixed;inset:0 0 0 auto;width:min(80vw,320px);background:#fff;flex-direction:column;
    align-items:flex-start;justify-content:flex-start;padding:90px 30px 30px;gap:6px;
    transform:translateX(100%);transition:.35s;box-shadow:-20px 0 60px -30px rgba(0,0,0,.5);z-index:99}
  .main-nav.open{transform:translateX(0)}
  .main-nav a{color:var(--ink)!important;width:100%;padding:12px 0;border-bottom:1px solid var(--line);font-size:16px}
  .main-nav a:not(.nav-cta)::after{display:none}
  .nav-cta{margin-top:14px;text-align:center;border-bottom:0!important}
  .nav-toggle{display:flex;z-index:100}
  .nav-toggle.open span{background:var(--ink)}
  .nav-toggle.open span:nth-child(1){transform:translateY(7.5px) rotate(45deg)}
  .nav-toggle.open span:nth-child(2){opacity:0}
  .nav-toggle.open span:nth-child(3){transform:translateY(-7.5px) rotate(-45deg)}
  body.nav-open{overflow:hidden}
}
@media (max-width:720px){
  .section{padding:70px 0}
  .product{grid-template-columns:1fr;gap:30px;margin-bottom:60px}
  .product.reverse .product-media{order:0}
  .tech-grid,.sol-cards,.adv-grid,.roi-cards,.platform-grid,.team-grid,.expert-row{grid-template-columns:1fr}
  .loop,.roi,.platform{padding:32px 22px}
  .loop-arrow{transform:rotate(90deg)}
  .footer-grid{grid-template-columns:1fr 1fr;gap:30px}
  .hero-stats{gap:16px 26px}
  .hero-stats strong{font-size:28px}
  .timeline::before{left:38px}
  .tl-year{width:74px;font-size:19px}
  .tl-year::after{right:-21px}
}
@media (max-width:460px){
  .container{padding:0 18px}
  .footer-grid{grid-template-columns:1fr}
  .hero-actions .btn{flex:1;justify-content:center}
}

/* ===== Breadcrumb (产品详情页) ===== */
.crumb{font-size:14px;color:var(--muted);margin-bottom:28px}
.crumb a{color:var(--brand);text-decoration:none}
.crumb a:hover{text-decoration:underline}
.crumb span{margin:0 8px;color:var(--line)}
.crumb>span:last-child{color:var(--body);margin:0}

/* ===== 技术参数表 (产品详情页) ===== */
.spec-section{margin-top:64px}
.spec-actions{margin:22px 0 4px;display:flex;flex-wrap:wrap;gap:14px;align-items:center}
.spec-table-wrap{margin-top:24px;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden}
.spec-table{width:100%;border-collapse:collapse;font-size:15px}
.spec-table caption{text-align:left;padding:16px 20px;font-weight:800;color:var(--ink);
  background:var(--bg-soft);border-bottom:1px solid var(--line);font-size:15px}
.spec-table th,.spec-table td{padding:14px 20px;text-align:left;border-bottom:1px solid var(--line);vertical-align:top}
.spec-table tr:last-child th,.spec-table tr:last-child td{border-bottom:none}
.spec-table th{width:34%;font-weight:700;color:var(--muted);background:#fff;white-space:nowrap}
.spec-table td{color:var(--ink);font-weight:600}
.spec-table tbody tr:nth-child(even) th,.spec-table tbody tr:nth-child(even) td{background:var(--bg-soft)}
@media (max-width:560px){
  .spec-table,.spec-table th,.spec-table td{font-size:14px}
  .spec-table th,.spec-table td{padding:12px 14px}
  .spec-table th{width:42%;white-space:normal}
}