/* ============================================================
   LYH-TECH — Site Stylesheet
   Minimal corporate style for Facebook business verification
   ============================================================ */

:root{
  --navy:#0f2540;
  --navy-2:#1b3a5c;
  --accent:#c8102e;
  --accent-2:#e11d38;
  --ink:#1f2933;
  --ink-2:#4a5a6a;
  --line:#dfe5ec;
  --bg:#ffffff;
  --bg-2:#f5f7fa;
  --radius:6px;
  --max:1120px;
}

*{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body{
  margin:0;
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Helvetica Neue",Arial,"PingFang SC","Microsoft YaHei",sans-serif;
  color:var(--ink);
  background:var(--bg);
  font-size:16px;
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;}
a{color:var(--navy-2);text-decoration:none;}
a:hover{color:var(--accent);}
h1,h2,h3,h4{margin:0 0 .6em;line-height:1.28;color:var(--navy);font-weight:700;}
h1{font-size:2.1rem;letter-spacing:-.015em;}
h2{font-size:1.5rem;}
h3{font-size:1.08rem;}
p{margin:0 0 1em;}
ul{margin:0 0 1em;padding-left:1.15em;}
li{margin-bottom:.35em;}
.wrap{max-width:var(--max);margin:0 auto;padding:0 22px;}

/* ---------- Top bar ---------- */
.topbar{
  background:var(--navy);
  color:#c8d4e2;
  font-size:.8rem;
  letter-spacing:.02em;
}
.topbar .wrap{
  display:flex;justify-content:space-between;align-items:center;
  min-height:38px;flex-wrap:wrap;gap:6px;
}
.topbar a{color:#c8d4e2;}
.topbar a:hover{color:#fff;}
.topbar-item{display:inline-flex;align-items:center;gap:6px;}
.topbar-item + .topbar-item{margin-left:18px;}

/* ---------- Header / Nav ---------- */
header.site{
  background:#fff;
  border-bottom:1px solid var(--line);
  position:sticky;top:0;z-index:50;
}
header.site .wrap{
  display:flex;align-items:center;justify-content:space-between;
  min-height:74px;gap:18px;flex-wrap:wrap;
}
.brand{display:flex;align-items:center;gap:12px;}
.brand-mark{
  width:42px;height:42px;flex:0 0 42px;
  background:linear-gradient(135deg,var(--navy) 0%,var(--navy-2) 100%);
  border-radius:5px;
  display:flex;align-items:center;justify-content:center;
  color:#fff;font-weight:800;font-size:.95rem;letter-spacing:.02em;
}
.brand-text{line-height:1.2;}
.brand-name{font-weight:800;color:var(--navy);font-size:1.02rem;letter-spacing:-.01em;}
.brand-sub{font-size:.7rem;color:#8494a6;letter-spacing:.06em;text-transform:uppercase;}

nav.main ul{display:flex;list-style:none;margin:0;padding:0;gap:4px;flex-wrap:wrap;}
nav.main a{
  display:block;padding:9px 14px;border-radius:4px;
  font-size:.9rem;font-weight:600;color:var(--ink-2);
}
nav.main a:hover{background:var(--bg-2);color:var(--navy);}
nav.main a.active{color:var(--navy);background:#eef2f7;}

.nav-toggle{
  display:none;background:none;border:1px solid var(--line);border-radius:4px;
  padding:8px 11px;font-size:.85rem;color:var(--navy);cursor:pointer;
}

/* ---------- Hero ---------- */
.hero{
  background:
    radial-gradient(1100px 380px at 82% -10%,rgba(200,16,46,.20),transparent 62%),
    linear-gradient(135deg,#0d2138 0%,#16324f 52%,#1d3f61 100%);
  color:#eaf1f8;
  padding:64px 0 58px;
  border-bottom:4px solid var(--accent);
}
.hero .kicker{
  display:inline-block;
  font-size:.72rem;font-weight:700;letter-spacing:.16em;text-transform:uppercase;
  color:#ffb3bf;border:1px solid rgba(255,179,191,.4);
  padding:5px 11px;border-radius:3px;margin-bottom:20px;
}
.hero h1{color:#fff;font-size:2.35rem;max-width:20em;margin-bottom:.45em;}
.hero h1 em{font-style:normal;color:#ff8d9e;}
.hero p.lead{color:#c2d2e3;font-size:1.06rem;max-width:44em;margin-bottom:26px;}
.hero-actions{display:flex;gap:12px;flex-wrap:wrap;}

.btn{
  display:inline-block;padding:12px 22px;border-radius:4px;
  font-weight:700;font-size:.92rem;border:1px solid transparent;
  transition:background .15s,color .15s,border-color .15s;
}
.btn-primary{background:var(--accent);color:#fff;}
.btn-primary:hover{background:var(--accent-2);color:#fff;}
.btn-ghost{border-color:rgba(255,255,255,.42);color:#fff;}
.btn-ghost:hover{background:rgba(255,255,255,.1);color:#fff;}
.btn-dark{background:var(--navy);color:#fff;}
.btn-dark:hover{background:var(--navy-2);color:#fff;}

/* ---------- Value strip ---------- */
.strip{background:var(--bg-2);border-bottom:1px solid var(--line);}
.strip .wrap{
  display:grid;grid-template-columns:repeat(5,1fr);
  gap:0;padding-top:0;padding-bottom:0;
}
.strip-item{
  padding:22px 16px;text-align:center;border-right:1px solid var(--line);
}
.strip-item:last-child{border-right:none;}
.strip-item strong{display:block;font-size:1.16rem;color:var(--navy);font-weight:800;}
.strip-item span{font-size:.78rem;color:#7c8b9c;letter-spacing:.04em;text-transform:uppercase;}

/* ---------- Sections ---------- */
section{padding:56px 0;}
section.alt{background:var(--bg-2);border-top:1px solid var(--line);border-bottom:1px solid var(--line);}
.section-head{max-width:46em;margin-bottom:34px;}
.section-head .eyebrow{
  font-size:.72rem;font-weight:800;letter-spacing:.16em;text-transform:uppercase;
  color:var(--accent);margin-bottom:10px;
}
.section-head p{color:var(--ink-2);margin:0;}

/* ---------- Cards ---------- */
.grid{display:grid;gap:20px;}
.grid-3{grid-template-columns:repeat(3,1fr);}
.grid-2{grid-template-columns:repeat(2,1fr);}
.grid-4{grid-template-columns:repeat(4,1fr);}

.card{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:26px 24px;
}
.card h3{margin-bottom:.5em;}
.card p{color:var(--ink-2);font-size:.94rem;margin:0;}
.card .num{
  font-size:.72rem;font-weight:800;letter-spacing:.1em;color:var(--accent);
  display:block;margin-bottom:12px;
}

.card-hover:hover{border-color:#c3d0de;box-shadow:0 6px 20px rgba(15,37,64,.07);}

.icon{
  width:38px;height:38px;border-radius:4px;background:#eef2f7;
  display:flex;align-items:center;justify-content:center;margin-bottom:16px;
  color:var(--navy);font-weight:800;font-size:.95rem;
}

/* ---------- Product list ---------- */
.prod-list{display:grid;gap:0;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;background:#fff;}
.prod-row{
  display:grid;grid-template-columns:210px 1fr;gap:24px;
  padding:24px 26px;border-bottom:1px solid var(--line);
}
.prod-row:last-child{border-bottom:none;}
.prod-row:nth-child(even){background:#fafbfd;}
.prod-row h3{margin:0 0 .35em;font-size:1.02rem;}
.prod-row p{margin:0;color:var(--ink-2);font-size:.93rem;}
.prod-cat{
  font-size:.72rem;font-weight:800;letter-spacing:.1em;text-transform:uppercase;
  color:var(--accent);padding-top:4px;
}

/* ---------- Info table ---------- */
table.info{width:100%;border-collapse:collapse;background:#fff;border:1px solid var(--line);}
table.info th,table.info td{
  text-align:left;padding:13px 16px;border-bottom:1px solid var(--line);
  font-size:.92rem;vertical-align:top;
}
table.info th{
  width:210px;background:var(--bg-2);font-weight:700;color:var(--navy);
}
table.info tr:last-child th,table.info tr:last-child td{border-bottom:none;}

/* ---------- Callout ---------- */
.callout{
  background:#fff;border:1px solid var(--line);border-left:4px solid var(--accent);
  border-radius:var(--radius);padding:22px 24px;
}
.callout p:last-child{margin-bottom:0;}

/* ---------- CTA band ---------- */
.cta-band{
  background:linear-gradient(135deg,#0d2138,#1d3f61);color:#eaf1f8;
  padding:48px 0;text-align:center;
}
.cta-band h2{color:#fff;margin-bottom:.35em;}
.cta-band p{color:#c2d2e3;max-width:40em;margin:0 auto 24px;}

/* ---------- Contact ---------- */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:28px;align-items:start;}

form.inquiry{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:26px;}
form.inquiry label{
  display:block;font-size:.8rem;font-weight:700;color:var(--navy);
  margin-bottom:6px;letter-spacing:.02em;
}
form.inquiry .field{margin-bottom:16px;}
form.inquiry input,form.inquiry textarea,form.inquiry select{
  width:100%;padding:10px 12px;border:1px solid #ccd6e0;border-radius:4px;
  font-size:.93rem;font-family:inherit;color:var(--ink);background:#fff;
}
form.inquiry input:focus,form.inquiry textarea:focus,form.inquiry select:focus{
  outline:none;border-color:var(--navy-2);box-shadow:0 0 0 3px rgba(27,58,92,.1);
}
form.inquiry textarea{resize:vertical;min-height:110px;}
.form-note{font-size:.78rem;color:#8494a6;margin:12px 0 0;}

/* ---------- Footer ---------- */
footer.site{background:var(--navy);color:#a9bacd;padding:48px 0 0;font-size:.88rem;}
footer.site .cols{
  display:grid;grid-template-columns:1.5fr 1fr 1fr 1.2fr;gap:30px;
  padding-bottom:36px;
}
footer.site h4{color:#fff;font-size:.82rem;letter-spacing:.1em;text-transform:uppercase;margin-bottom:14px;}
footer.site a{color:#a9bacd;}
footer.site a:hover{color:#fff;}
footer.site ul{list-style:none;padding:0;margin:0;}
footer.site li{margin-bottom:8px;}
footer.site .f-brand{display:flex;align-items:center;gap:11px;margin-bottom:14px;}
footer.site .f-brand .brand-mark{background:rgba(255,255,255,.1);}
footer.site .f-brand .brand-name{color:#fff;}
footer.site .f-brand .brand-sub{color:#7a8fa6;}
.legal{
  border-top:1px solid rgba(255,255,255,.12);
  padding:18px 0;font-size:.79rem;color:#8296ab;
  display:flex;justify-content:space-between;gap:14px;flex-wrap:wrap;
}
.legal .ids{font-size:.75rem;color:#6d8199;}

/* ---------- Page header (inner pages) ---------- */
.page-head{
  background:linear-gradient(135deg,#0d2138,#1d3f61);color:#eaf1f8;
  padding:44px 0 40px;border-bottom:4px solid var(--accent);
}
.page-head h1{color:#fff;font-size:1.9rem;margin-bottom:.25em;}
.page-head p{color:#c2d2e3;margin:0;max-width:44em;}
.crumb{font-size:.78rem;color:#8fa6bd;margin-bottom:14px;letter-spacing:.02em;}
.crumb a{color:#8fa6bd;}
.crumb a:hover{color:#fff;}

/* ---------- Prose (policy pages) ---------- */
.prose{max-width:52em;}
.prose h2{font-size:1.2rem;margin-top:1.8em;}
.prose h2:first-child{margin-top:0;}
.prose h3{font-size:1rem;margin-top:1.4em;}
.prose ul{padding-left:1.2em;}
.prose .meta{font-size:.82rem;color:#8494a6;margin-bottom:2em;}

/* ---------- Responsive ---------- */
@media (max-width:900px){
  .strip .wrap{grid-template-columns:repeat(3,1fr);}
  .strip-item:nth-child(3){border-right:none;}
  .grid-4{grid-template-columns:repeat(2,1fr);}
  .grid-3{grid-template-columns:1fr;}
  .contact-grid{grid-template-columns:1fr;}
  footer.site .cols{grid-template-columns:1fr 1fr;}
}
@media (max-width:720px){
  h1{font-size:1.7rem;}
  .hero{padding:44px 0 40px;}
  .hero h1{font-size:1.75rem;}
  .topbar .wrap{justify-content:center;text-align:center;}
  .topbar-item.hide-sm{display:none;}
  header.site .wrap{min-height:auto;padding-top:12px;padding-bottom:12px;}
  .nav-toggle{display:block;}
  nav.main{display:none;width:100%;}
  nav.main.open{display:block;}
  nav.main ul{flex-direction:column;gap:0;width:100%;padding-bottom:8px;}
  nav.main a{padding:11px 12px;border-top:1px solid var(--line);border-radius:0;}
  .strip .wrap{grid-template-columns:repeat(2,1fr);}
  .prod-row{grid-template-columns:1fr;gap:8px;}
  .grid-2{grid-template-columns:1fr;}
  table.info th{width:auto;}
  table.info th,table.info td{display:block;}
  table.info th{border-bottom:none;padding-bottom:4px;}
  section{padding:40px 0;}
  footer.site .cols{grid-template-columns:1fr;}
  .logo-strip{grid-template-columns:1fr 1fr;}
}
@media (max-width:480px){
  .strip .wrap{grid-template-columns:1fr;}
  .strip-item{border-right:none;border-bottom:1px solid var(--line);}
  .grid-4{grid-template-columns:1fr;}
  .logo-strip{grid-template-columns:1fr;}
}

/* ---------- Misc utility ---------- */
.mt-0{margin-top:0;}
.mb-0{margin-bottom:0;}
.muted{color:#8494a6;}
.small{font-size:.86rem;}
.nowrap{white-space:nowrap;}