/* =========================================================
   Launston Technology — 官网静态素材包样式
   主题：深蓝科技风，响应式。无需任何框架，纯 CSS。
   替换真实产品图：把图片放到 assets/img/ 下，再在 HTML 里
   把 .ph 占位块换成 <img src="assets/img/xxx.jpg" alt="...">
   ========================================================= */
:root{
  --blue:#0D2C54;
  --blue-2:#143a6b;
  --cyan:#00A0E9;
  --cyan-soft:#e6f6fe;
  --ink:#1f2937;
  --muted:#5b6b7f;
  --line:#e3e9f0;
  --bg:#f5f7fa;
  --white:#ffffff;
  --radius:14px;
  --shadow:0 6px 24px rgba(13,44,84,.08);
  --maxw:1180px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",Roboto,Helvetica,Arial,sans-serif;
  color:var(--ink);background:var(--white);line-height:1.65;
  -webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
.container{max-width:var(--maxw);margin:0 auto;padding:0 20px}
.muted{color:var(--muted)}
.center{text-align:center}

/* ---------- Header / Nav ---------- */
.site-header{
  position:sticky;top:0;z-index:50;background:rgba(255,255,255,.92);
  backdrop-filter:blur(8px);border-bottom:1px solid var(--line);
}
.nav{display:flex;align-items:center;justify-content:space-between;height:64px}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;color:var(--blue);font-size:19px;letter-spacing:.3px}
.brand .logo{width:34px;height:34px;border-radius:8px;background:linear-gradient(135deg,var(--blue),var(--cyan));display:flex;align-items:center;justify-content:center;color:#fff;font-weight:800}
.nav-links{display:flex;gap:26px;align-items:center}
.nav-links a{color:var(--ink);font-weight:600;font-size:15px;position:relative;padding:6px 0}
.nav-links a:hover{color:var(--cyan)}
.nav-cta{background:var(--cyan);color:#fff!important;padding:9px 18px!important;border-radius:999px;font-weight:700}
.nav-cta:hover{background:var(--blue)}
.hamburger{display:none;flex-direction:column;gap:5px;background:none;border:0;cursor:pointer;padding:8px}
.hamburger span{width:24px;height:2px;background:var(--blue);border-radius:2px;transition:.3s}

/* ---------- Language toggle ---------- */
.lang-toggle{margin-left:14px;background:var(--blue);color:#fff;border:0;border-radius:999px;padding:8px 16px;font-weight:700;font-size:14px;cursor:pointer;letter-spacing:.5px;white-space:nowrap}
.lang-toggle:hover{background:var(--cyan)}
@media(max-width:680px){
  .lang-toggle{margin:10px 0 0}
}

/* ---------- Hero ---------- */
.hero{
  position:relative;color:#fff;overflow:hidden;
  background:
    radial-gradient(1200px 500px at 80% -10%,rgba(0,160,233,.35),transparent 60%),
    linear-gradient(135deg,var(--blue) 0%,var(--blue-2) 100%);
}
.hero::after{content:"";position:absolute;inset:0;background-image:
  linear-gradient(rgba(255,255,255,.06) 1px,transparent 1px),
  linear-gradient(90deg,rgba(255,255,255,.06) 1px,transparent 1px);
  background-size:42px 42px;opacity:.5;pointer-events:none}
.hero-inner{position:relative;z-index:2;padding:84px 0 96px}
.hero h1{font-size:42px;line-height:1.2;font-weight:800;letter-spacing:.2px;max-width:880px}
.hero p.lead{font-size:19px;opacity:.92;margin:20px 0 30px;max-width:680px}
.freq-badges{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:30px}
.freq-badges span{background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.25);
  padding:6px 14px;border-radius:999px;font-weight:700;font-size:14px;letter-spacing:.5px}
.btn{display:inline-block;padding:13px 26px;border-radius:999px;font-weight:700;font-size:15px;cursor:pointer;border:0;transition:.2s}
.btn-primary{background:var(--cyan);color:#fff}
.btn-primary:hover{background:#fff;color:var(--blue)}
.btn-ghost{background:transparent;border:1.5px solid rgba(255,255,255,.6);color:#fff}
.btn-ghost:hover{background:#fff;color:var(--blue)}
.btn-secondary{background:transparent;border:1.5px solid var(--blue);color:var(--blue)}
.btn-secondary:hover{background:var(--blue);color:#fff}
.btn-row{display:flex;gap:10px;flex-wrap:wrap;margin-top:14px}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap}

/* ---------- Stats bar ---------- */
.stats{background:var(--blue);color:#fff}
.stats-grid{display:flex;flex-wrap:wrap;gap:10px;padding:26px 0}
.stat{flex:1;min-width:140px;text-align:center;padding:8px 10px}
.stat .num{font-size:34px;font-weight:800;color:var(--cyan)}
.stat .lab{font-size:14px;opacity:.85;margin-top:2px}

/* ---------- Sections ---------- */
.section{padding:72px 0}
.section.alt{background:var(--bg)}
.section h2{font-size:30px;color:var(--blue);font-weight:800;margin-bottom:8px;letter-spacing:.3px}
.section .sub{color:var(--muted);margin-bottom:36px;font-size:16px;max-width:720px}
.eyebrow{display:inline-block;color:var(--cyan);font-weight:700;letter-spacing:1.5px;font-size:13px;text-transform:uppercase;margin-bottom:10px}

/* ---------- Cards ---------- */
.grid{display:grid;gap:22px}
.grid.cols-2{grid-template-columns:repeat(2,1fr)}
.grid.cols-3{grid-template-columns:repeat(3,1fr)}
.grid.cols-4{grid-template-columns:repeat(4,1fr)}
.card{background:var(--white);border:1px solid var(--line);border-radius:var(--radius);padding:26px;box-shadow:var(--shadow);transition:.2s}
.card:hover{transform:translateY(-4px);box-shadow:0 14px 34px rgba(13,44,84,.14)}
.card h3{color:var(--blue);font-size:19px;margin-bottom:10px}
.card p{color:var(--muted);font-size:15px}
.card .ico{width:48px;height:48px;border-radius:12px;background:var(--cyan-soft);color:var(--cyan);
  display:flex;align-items:center;justify-content:center;margin-bottom:16px;font-weight:800;font-size:20px}
.feature .ico{background:var(--cyan-soft);color:var(--cyan)}

/* ---------- Product cards ---------- */
.product{display:flex;flex-direction:column;gap:12px}
.product .ph{height:150px;border-radius:10px;background:linear-gradient(135deg,#0D2C54,#00A0E9);
  display:flex;align-items:flex-end;padding:12px;color:#fff;font-weight:700;font-size:14px;position:relative;overflow:hidden}
.product .ph::after{content:"";position:absolute;right:-20px;top:-20px;width:90px;height:90px;border-radius:50%;background:rgba(255,255,255,.15)}
.freq-tag{display:inline-block;font-size:12px;font-weight:800;padding:3px 10px;border-radius:999px;letter-spacing:.5px}
.freq-24{background:#e8f5e9;color:#2e7d32}
.freq-77{background:#e3f2fd;color:#1565c0}
.freq-80{background:#fff3e0;color:#e65100}
.freq-fiber{background:#f3e5f5;color:#6a1b9a}
.product h3{font-size:18px;color:var(--blue);margin:4px 0}
.product .desc{font-size:14px;color:var(--muted);flex:1}
.specs{list-style:none;display:flex;flex-wrap:wrap;gap:6px;margin-top:4px}
.specs li{background:var(--bg);border:1px solid var(--line);border-radius:8px;padding:5px 9px;font-size:12.5px;color:var(--ink)}
.apps{font-size:13px;color:var(--muted);margin-top:6px}
.apps b{color:var(--blue)}

.group-title{display:flex;align-items:center;gap:12px;margin:38px 0 18px}
.group-title h3{font-size:22px;color:var(--blue)}
.group-title .line{flex:1;height:1px;background:var(--line)}

/* ---------- Cert strip ---------- */
.certs{display:flex;flex-wrap:wrap;gap:14px;justify-content:center}
.cert{background:#fff;border:1px solid var(--line);border-radius:10px;padding:14px 22px;font-weight:700;color:var(--blue);box-shadow:var(--shadow)}

/* ---------- CTA ---------- */
.cta{background:linear-gradient(135deg,var(--blue),var(--blue-2));color:#fff;border-radius:18px;padding:46px;text-align:center;margin:8px 0}
.cta h2{color:#fff}
.cta p{opacity:.9;margin:10px 0 24px}

/* ---------- Locations ---------- */
.loc{display:flex;flex-direction:column;gap:6px}
.loc .role{color:var(--cyan);font-weight:700;font-size:13px;text-transform:uppercase;letter-spacing:1px}
.loc address{font-style:normal;color:var(--muted);font-size:15px;line-height:1.6}

/* ---------- Contact ---------- */
.contact-grid{display:grid;grid-template-columns:1fr 1.2fr;gap:34px}
.info-box{background:var(--bg);border:1px solid var(--line);border-radius:var(--radius);padding:24px}
.info-box h3{color:var(--blue);margin-bottom:6px;font-size:17px}
.info-box a{color:var(--cyan);font-weight:600}
.info-box p{color:var(--muted);font-size:14px}
form .field{margin-bottom:16px}
form label{display:block;font-weight:600;margin-bottom:6px;font-size:14px;color:var(--ink)}
form input,form select,form textarea{
  width:100%;padding:12px 14px;border:1px solid var(--line);border-radius:10px;font-size:15px;font-family:inherit;background:#fff;
}
form input:focus,form select:focus,form textarea:focus{outline:none;border-color:var(--cyan);box-shadow:0 0 0 3px var(--cyan-soft)}
form textarea{resize:vertical;min-height:120px}
.form-note{font-size:13px;color:var(--muted);margin-top:8px}

/* ---------- News ---------- */
.news .meta{color:var(--cyan);font-weight:700;font-size:13px;margin-bottom:6px}
.news h3{font-size:18px;color:var(--blue)}

/* ---------- Footer ---------- */
.site-footer{background:var(--blue);color:#cdd9e8;padding:48px 0 28px}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:30px}
.site-footer h4{color:#fff;font-size:15px;margin-bottom:14px;letter-spacing:.5px}
.site-footer a{color:#cdd9e8;font-size:14px;display:block;margin-bottom:8px}
.site-footer a:hover{color:var(--cyan)}
.footer-brand{font-size:14px;line-height:1.7}
.footer-bottom{border-top:1px solid rgba(255,255,255,.12);margin-top:30px;padding-top:18px;font-size:13px;color:#9fb1c6;display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px}

/* ---------- Product detail bilingual sections ---------- */
.detail-lbl{font-size:17px;color:var(--blue);margin:24px 0 10px;font-weight:700}
.section p{line-height:1.75}
.section ul{margin:0 0 14px 18px;line-height:1.8;color:var(--muted)}
.spec-table{width:100%;border-collapse:collapse;margin:10px 0 20px;font-size:14px;background:#fff}
.spec-table th,.spec-table td{border:1px solid var(--line);padding:10px 12px;text-align:left}
.spec-table th{background:var(--blue);color:#fff;font-weight:600}
.spec-table tr:nth-child(even){background:var(--bg)}
.lang-en,.lang-zh{display:none}
html[lang="en"] .lang-en{display:block}
html[lang="zh-CN"] .lang-zh{display:block}
/* inline bilingual text inside headings, links, buttons and table headers */
.hero h1 .lang-en,.hero h1 .lang-zh,
.section h2 .lang-en,.section h2 .lang-zh,
p.desc .lang-en,p.desc .lang-zh,
.lead a .lang-en,.lead a .lang-zh,
.detail-lbl .lang-en,.detail-lbl .lang-zh,
.spec-table thead .lang-en,.spec-table thead .lang-zh,
.btn-row .lang-en,.btn-row .lang-zh{display:inline}
html[lang="en"] .hero h1 .lang-zh,html[lang="zh-CN"] .hero h1 .lang-en,
html[lang="en"] .section h2 .lang-zh,html[lang="zh-CN"] .section h2 .lang-en,
html[lang="en"] p.desc .lang-zh,html[lang="zh-CN"] p.desc .lang-en,
html[lang="en"] .lead a .lang-zh,html[lang="zh-CN"] .lead a .lang-en,
html[lang="en"] .detail-lbl .lang-zh,html[lang="zh-CN"] .detail-lbl .lang-en,
html[lang="en"] .spec-table thead .lang-zh,html[lang="zh-CN"] .spec-table thead .lang-en,
html[lang="en"] .btn-row .lang-zh,html[lang="zh-CN"] .btn-row .lang-en{display:none}

/* ---------- Responsive ---------- */
@media(max-width:920px){
  .grid.cols-4{grid-template-columns:repeat(2,1fr)}
  .grid.cols-3{grid-template-columns:repeat(2,1fr)}
  .contact-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:680px){
  .nav-links{position:absolute;top:64px;left:0;right:0;background:#fff;flex-direction:column;gap:0;
    padding:10px 20px 20px;border-bottom:1px solid var(--line);display:none}
  .nav-links.open{display:flex}
  .nav-links a{padding:12px 0;border-bottom:1px solid var(--line);width:100%}
  .hamburger{display:flex}
  .hero h1{font-size:30px}
  .hero p.lead{font-size:16px}
  .grid.cols-2,.grid.cols-3,.grid.cols-4{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
  .cta{padding:30px 22px}
  .stats-grid{gap:0}
  .stat{min-width:50%}
}

/* Related Products (SEO internal links) */
.related-products{padding:48px 0;background:#f7f9fc;border-top:1px solid #e6ebf2}
.related-products h2{text-align:center;font-size:1.6rem;margin:0 0 28px;color:#0D2C54}
.rp-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:18px;max-width:1100px;margin:0 auto;padding:0 20px}
.rp-card{display:flex;flex-direction:column;align-items:center;background:#fff;border:1px solid #e6ebf2;border-radius:10px;padding:14px;text-decoration:none;transition:.2s ease}
.rp-card:hover{box-shadow:0 6px 20px rgba(13,44,84,.12);transform:translateY(-3px)}
.rp-card img{width:100%;height:110px;object-fit:cover;border-radius:6px;margin-bottom:10px}
.rp-name{font-size:.92rem;color:#0D2C54;font-weight:600;text-align:center;line-height:1.3}