/* ============================================================
   Xifu Wire Mesh — Global Design System
   High-end industrial / clean / professional / trustworthy
   Tokens: deep steel navy + industrial amber accent, 4px radius,
   subtle borders, restrained motion.
   ============================================================ */
:root{
  --primary:#16324b;        /* deep steel navy */
  --primary-dark:#0e2334;
  --primary-soft:#eaf0f5;
  --accent:#e07b1f;         /* industrial amber */
  --accent-dark:#b9610f;
  --accent-soft:#fdf3e7;
  --text:#1f2a37;
  --muted:#5d6e80;
  --line:#e2e9f0;
  --bg:#ffffff;
  --bg-soft:#f5f7f9;
  --bg-dark:#101d29;
  --radius:4px;
  --shadow-sm:0 1px 3px rgba(16,29,41,.08);
  --shadow-md:0 4px 14px rgba(16,29,41,.10);
  --header-h:72px;
  --font:"Inter","Helvetica Neue",Arial,"PingFang SC","Microsoft YaHei",sans-serif;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{font-family:var(--font);color:var(--text);background:var(--bg);line-height:1.65;font-size:16px}
img{max-width:100%;height:auto;display:block}
a{color:var(--primary);text-decoration:none}
a:hover{color:var(--accent-dark)}
h1,h2,h3,h4{line-height:1.28;font-weight:700;color:var(--primary-dark);letter-spacing:-.01em}
h1{font-size:clamp(1.9rem,4.2vw,2.9rem)}
h2{font-size:clamp(1.45rem,3vw,2.05rem)}
h3{font-size:1.18rem}
p{margin:0 0 1rem}
ul.clean{list-style:none}
.container{max-width:1180px;margin:0 auto;padding:0 20px}
.section{padding:64px 0}
.section.soft{background:var(--bg-soft)}
.section.dark{background:var(--bg-dark);color:#dbe4ec}
.section.dark h1,.section.dark h2,.section.dark h3{color:#fff}
.eyebrow{display:inline-block;font-size:.78rem;font-weight:700;letter-spacing:.14em;text-transform:uppercase;color:var(--accent-dark);margin-bottom:10px}
.section-head{max-width:760px;margin-bottom:36px}
.section-head.center{margin-left:auto;margin-right:auto;text-align:center}
.section-head p.lead{color:var(--muted);font-size:1.05rem}

/* ---------- Buttons ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;font-weight:600;font-size:.95rem;padding:13px 30px;border-radius:var(--radius);border:1px solid transparent;cursor:pointer;transition:background .2s,border-color .2s,color .2s,transform .15s;white-space:nowrap}
.btn:active{transform:translateY(1px)}
.btn-primary{background:var(--primary);color:#fff;border-color:var(--primary)}
.btn-primary:hover{background:var(--primary-dark);color:#fff;border-color:var(--primary-dark)}
.btn-accent{background:var(--accent);color:#fff;border-color:var(--accent)}
.btn-accent:hover{background:var(--accent-dark);color:#fff;border-color:var(--accent-dark)}
.btn-outline{background:#fff;color:var(--primary);border-color:var(--primary)}
.btn-outline:hover{background:var(--primary);color:#fff}
.btn-outline-light{background:transparent;color:#fff;border-color:rgba(255,255,255,.65)}
.btn-outline-light:hover{background:#fff;color:var(--primary-dark)}
.btn-sm{padding:9px 18px;font-size:.86rem}
.btn-block{width:100%}
.btn-group{display:flex;gap:14px;flex-wrap:wrap;margin-top:26px}

/* ---------- Top utility bar ---------- */
.topbar{background:var(--primary-dark);color:#cfd9e2;font-size:.82rem}
.topbar .container{display:flex;justify-content:space-between;align-items:center;height:38px}
.topbar a{color:#e6edf3}
.topbar a:hover{color:#fff}
.topbar .t-contact{display:flex;gap:20px;align-items:center}
.topbar .t-contact span{display:inline-flex;align-items:center;gap:6px}
.topbar .t-lang{display:flex;gap:14px}

/* ---------- Header / Nav ---------- */
.site-header{position:sticky;top:0;z-index:200;background:#fff;border-bottom:1px solid var(--line)}
.header-main .container{display:flex;align-items:center;justify-content:space-between;height:var(--header-h);gap:18px}
.brand{display:flex;align-items:center;gap:12px;font-weight:800;font-size:1.2rem;color:var(--primary-dark);letter-spacing:.02em;flex-shrink:0}
.brand img{height:44px;width:auto}
.brand>span{white-space:nowrap;line-height:1.15}
.brand small{display:block;font-size:.62rem;font-weight:600;color:var(--muted);letter-spacing:.14em;white-space:nowrap}
.main-nav{display:flex;align-items:center;gap:4px}
.main-nav>ul{display:flex;list-style:none;gap:2px}
.main-nav a.nl{display:block;padding:10px 12px;font-weight:600;font-size:.92rem;color:var(--text);border-radius:var(--radius);white-space:nowrap}
.main-nav a.nl:hover,.main-nav a.nl.active{background:var(--bg-soft);color:var(--primary-dark)}
.nav-item{position:relative}
.nav-drop{position:absolute;top:100%;left:0;min-width:260px;background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow-md);padding:8px;display:none}
.nav-item:hover>.nav-drop,.nav-item:focus-within>.nav-drop{display:block}
.nav-drop a{display:block;padding:10px 14px;font-size:.9rem;color:var(--text);border-radius:var(--radius);white-space:nowrap}
.nav-drop a:hover{background:var(--bg-soft);color:var(--primary-dark)}
.header-cta{display:flex;align-items:center;gap:10px}
.wa-link{display:inline-flex;align-items:center;gap:7px;font-weight:600;font-size:.9rem;color:#1e7e34}
.wa-link:hover{color:#14601f}
.burger{display:none;background:none;border:1px solid var(--line);border-radius:var(--radius);padding:9px 11px;cursor:pointer}
.burger span{display:block;width:22px;height:2px;background:var(--text);margin:5px 0}

/* mobile drawer */
.mobile-nav{display:none;position:fixed;inset:0;z-index:300;background:rgba(14,27,40,.55)}
.mobile-nav .drawer{position:absolute;right:0;top:0;bottom:0;width:min(340px,88vw);background:#fff;overflow-y:auto;padding:20px}
.mobile-nav.open{display:block}
.drawer-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:12px}
.drawer-close{background:none;border:1px solid var(--line);border-radius:var(--radius);font-size:1.1rem;padding:6px 12px;cursor:pointer}
.drawer a{display:block;padding:11px 6px;font-weight:600;border-bottom:1px solid var(--line);color:var(--text)}
.drawer .sub{padding-left:16px;font-weight:400;font-size:.92rem}
.drawer .btn{margin-top:16px}

/* ---------- Breadcrumbs ---------- */
.crumbs{background:var(--bg-soft);border-bottom:1px solid var(--line);font-size:.85rem;color:var(--muted)}
.crumbs .container{padding-top:11px;padding-bottom:11px}
.crumbs a{color:var(--muted)}
.crumbs a:hover{color:var(--primary)}
.crumbs .sep{margin:0 8px;color:#b7c3cf}

/* ---------- Hero ---------- */
.hero{background:var(--bg-dark);color:#e7edf3;position:relative;overflow:hidden}
.hero .container{position:relative;display:grid;grid-template-columns:1.15fr .85fr;gap:44px;align-items:center;padding-top:72px;padding-bottom:72px}
.hero h1{color:#fff;margin-bottom:16px}
.hero .sub{font-size:1.08rem;color:#c3cfd9;max-width:560px}
.hero-media{border-radius:6px;overflow:hidden;box-shadow:var(--shadow-md)}
.hero-media img{width:100%;height:100%;object-fit:cover;aspect-ratio:4/3}
.hero .btn-group .btn-outline-light{border-color:rgba(255,255,255,.7)}
.hero-trust{display:flex;gap:26px;flex-wrap:wrap;margin-top:30px}
.hero-trust .t{display:flex;align-items:center;gap:9px;font-size:.88rem;color:#c3cfd9}
.hero-trust .t b{color:#fff;font-size:1.05rem}

/* ---------- Cards ---------- */
.grid{display:grid;gap:22px}
.grid.g3{grid-template-columns:repeat(3,1fr)}
.grid.g4{grid-template-columns:repeat(4,1fr)}
.grid.g2{grid-template-columns:repeat(2,1fr)}
.card{background:#fff;border:1px solid var(--line);border-radius:6px;overflow:hidden;transition:box-shadow .2s,border-color .2s}
.card:hover{box-shadow:var(--shadow-md);border-color:#c9d5e0}
.card .c-media{aspect-ratio:16/10;overflow:hidden;background:#eef1f4}
.card .c-media img{width:100%;height:100%;object-fit:cover;transition:transform .4s}
.card:hover .c-media img{transform:scale(1.04)}
.card .c-body{padding:20px}
.card .c-body h3{margin-bottom:8px;font-size:1.05rem}
.card .c-body p{color:var(--muted);font-size:.92rem;margin-bottom:12px}
.card .c-link{font-weight:600;font-size:.9rem;color:var(--accent-dark)}
.card .c-link:hover{color:var(--accent)}

/* ---------- Spec table ---------- */
.spec-table{width:100%;border-collapse:collapse;background:#fff;border:1px solid var(--line);font-size:.94rem}
.spec-table th,.spec-table td{padding:12px 16px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}
.spec-table th{width:34%;background:var(--bg-soft);font-weight:600;color:var(--primary-dark)}
.spec-table tr:last-child th,.spec-table tr:last-child td{border-bottom:none}
.table-wrap{overflow-x:auto;border-radius:6px}

/* ---------- FAQ accordion ---------- */
.faq{border:1px solid var(--line);border-radius:6px;background:#fff;overflow:hidden}
.faq-item{border-bottom:1px solid var(--line)}
.faq-item:last-child{border-bottom:none}
.faq-q{width:100%;background:none;border:none;text-align:left;padding:17px 20px;font-size:1rem;font-weight:600;color:var(--primary-dark);cursor:pointer;display:flex;justify-content:space-between;align-items:center;gap:14px;font-family:var(--font)}
.faq-q .pm{font-size:1.3rem;color:var(--accent-dark);font-weight:400;flex-shrink:0}
.faq-a{max-height:0;overflow:hidden;transition:max-height .3s ease}
.faq-a .inner{padding:0 20px 18px;color:var(--muted)}
.faq-item.open .faq-a{max-height:500px}

/* ---------- CTA band ---------- */
.cta-band{background:var(--primary);color:#e7edf3}
.cta-band .container{display:flex;align-items:center;justify-content:space-between;gap:28px;padding-top:52px;padding-bottom:52px}
.cta-band h2{color:#fff;margin-bottom:8px}
.cta-band p{color:#c3cfd9;margin:0}
.cta-band .btn-group{margin-top:0;flex-shrink:0}

/* ---------- Forms ---------- */
.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.field{display:flex;flex-direction:column;gap:6px}
.field.full{grid-column:1/-1}
.field label{font-size:.86rem;font-weight:600;color:var(--primary-dark)}
.field label .req{color:#c0392b}
.field input,.field select,.field textarea{font-family:var(--font);font-size:.95rem;padding:12px 14px;border:1px solid #c9d5e0;border-radius:var(--radius);background:#fff;color:var(--text);width:100%}
.field input:focus,.field select:focus,.field textarea:focus{outline:2px solid var(--accent);outline-offset:-1px;border-color:var(--accent)}
.field textarea{min-height:130px;resize:vertical}
.field .hint{font-size:.78rem;color:var(--muted)}
.form-note{font-size:.85rem;color:var(--muted);margin-top:14px}

/* ---------- Footer ---------- */
.site-footer{background:var(--primary-dark);color:#c3cfd9;font-size:.92rem}
.footer-grid{display:grid;grid-template-columns:1.3fr 1fr 1fr 1.2fr;gap:36px;padding:56px 0 40px}
.site-footer h4{color:#fff;font-size:.95rem;letter-spacing:.06em;text-transform:uppercase;margin-bottom:18px}
.site-footer a{color:#c3cfd9}
.site-footer a:hover{color:#fff}
.site-footer ul{list-style:none}
.site-footer ul li{margin-bottom:10px}
.footer-brand p{margin:14px 0}
.social-row{display:flex;gap:10px;margin-top:16px}
.social-row a{display:inline-flex;width:38px;height:38px;border:1px solid rgba(255,255,255,.25);border-radius:var(--radius);align-items:center;justify-content:center;font-size:.8rem;font-weight:700;color:#fff}
.social-row a:hover{background:var(--accent);border-color:var(--accent)}
.footer-contact li{display:flex;gap:10px;margin-bottom:12px}
.footer-bottom{border-top:1px solid rgba(255,255,255,.12);padding:20px 0;font-size:.82rem;color:#93a3b3}
.footer-bottom .container{display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap}

/* ---------- WhatsApp float ---------- */
.wa-float{position:fixed;right:20px;bottom:20px;z-index:250;display:flex;align-items:center;gap:10px;background:#1e7e34;color:#fff;font-weight:600;padding:13px 20px;border-radius:40px;box-shadow:var(--shadow-md)}
.wa-float:hover{background:#14601f;color:#fff}

/* ---------- Misc ---------- */
.two-col{display:grid;grid-template-columns:1fr 1fr;gap:44px;align-items:center}
.check-list{list-style:none}
.check-list li{padding:9px 0 9px 30px;position:relative;border-bottom:1px dashed var(--line)}
.check-list li:last-child{border-bottom:none}
.check-list li::before{content:"✓";position:absolute;left:2px;top:9px;color:var(--accent-dark);font-weight:700}
.stat-row{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.stat{background:#fff;border:1px solid var(--line);border-radius:6px;padding:26px 20px;text-align:center}
.stat .n{font-size:1.9rem;font-weight:800;color:var(--primary-dark)}
.stat .l{font-size:.85rem;color:var(--muted);margin-top:6px}
.tag-row{display:flex;gap:10px;flex-wrap:wrap}
.tag{display:inline-block;background:var(--primary-soft);color:var(--primary-dark);font-size:.82rem;font-weight:600;padding:6px 14px;border-radius:30px}
.page-hero{background:var(--bg-soft);border-bottom:1px solid var(--line)}
.page-hero .container{padding-top:52px;padding-bottom:44px}
.page-hero p.lead{color:var(--muted);font-size:1.05rem;max-width:760px}
.media-frame{border-radius:6px;overflow:hidden;border:1px solid var(--line);background:#eef1f4}
.gallery{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.gallery .media-frame{aspect-ratio:4/3}
.gallery img{width:100%;height:100%;object-fit:cover}
.blog-meta{font-size:.82rem;color:var(--muted);margin-bottom:10px}
.prose{max-width:820px}
.prose h2{margin:1.8em 0 .7em}
.prose h3{margin:1.5em 0 .6em}
.prose p{margin-bottom:1.1rem}
.prose ul,.prose ol{margin:0 0 1.2rem 1.4rem}
.prose li{margin-bottom:.5rem}
.prose a{font-weight:600}
.toc{background:var(--bg-soft);border:1px solid var(--line);border-radius:6px;padding:20px 24px;margin-bottom:28px;font-size:.92rem}
.toc b{display:block;margin-bottom:8px;color:var(--primary-dark)}
.toc ul{margin-left:1.2rem}
.toc li{margin-bottom:4px}

/* related links */
.rel-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.rel-link{display:flex;align-items:center;gap:14px;background:#fff;border:1px solid var(--line);border-radius:6px;padding:16px}
.rel-link:hover{box-shadow:var(--shadow-sm);border-color:#c9d5e0}
.rel-link .thumb{width:64px;height:64px;border-radius:var(--radius);object-fit:cover;flex-shrink:0;background:#eef1f4}
.rel-link b{font-size:.92rem;color:var(--primary-dark);display:block}
.rel-link small{color:var(--muted);font-size:.8rem}

/* quote form shell */
.quote-shell{display:grid;grid-template-columns:1fr 380px;gap:36px;align-items:start}
.quote-card{background:#fff;border:1px solid var(--line);border-radius:8px;padding:34px;box-shadow:var(--shadow-sm)}
.quote-side .card{margin-bottom:18px}
.hidden{display:none!important}

/* reveal on scroll */
.rv{opacity:0;transform:translateY(14px);transition:opacity .5s ease,transform .5s ease}
.rv.in{opacity:1;transform:none}

/* ---------- Responsive ---------- */
@media(max-width:1020px){
  .main-nav,.header-cta .btn{display:none}
  .burger{display:block}
  .hero .container{grid-template-columns:1fr;padding-top:52px;padding-bottom:52px}
  .grid.g4{grid-template-columns:repeat(2,1fr)}
  .grid.g3{grid-template-columns:repeat(2,1fr)}
  .quote-shell{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr 1fr}
  .cta-band .container{flex-direction:column;align-items:flex-start}
  .stat-row{grid-template-columns:repeat(2,1fr)}
  .rel-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:640px){
  .topbar .t-lang{display:none}
  .grid.g3,.grid.g2,.grid.g4{grid-template-columns:1fr}
  .two-col{grid-template-columns:1fr}
  .form-grid{grid-template-columns:1fr}
  .section{padding:44px 0}
  .gallery{grid-template-columns:1fr 1fr}
  .rel-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
  .cta-band .container{padding-top:40px;padding-bottom:40px}
  .btn-group .btn{flex:1 1 100%}
  .wa-float{padding:12px 16px;font-size:.85rem}
  .stat-row{grid-template-columns:1fr 1fr}
  .quote-card{padding:22px}
  .brand small{display:none}
  .brand{font-size:1.05rem;gap:9px}
  .brand img{height:38px}
  .header-cta .wa-link{display:none}
}
@media(prefers-reduced-motion:reduce){
  *{transition:none!important;scroll-behavior:auto!important}
}