/* Ouzhilun Hardware — B2B lead-generation site
   Self-contained stylesheet. No external dependencies. */

:root{
  --ink:#0c161f;
  --steel:#123a5e;
  --steel-700:#0e2c49;
  --steel-500:#1c5b93;
  --accent:#c98a1f;
  --accent-soft:#f4e6cd;
  --line:#e2e7ed;
  --soft:#f5f7fa;
  --text:#1b2733;
  --muted:#5c6b7a;
  --radius:12px;
  --shadow-sm:0 1px 2px rgba(12,22,31,.06),0 1px 3px rgba(12,22,31,.05);
  --shadow-md:0 4px 14px rgba(12,22,31,.08);
  --container:1140px;
  --font:"Inter","Segoe UI",Roboto,"Helvetica Neue",Arial,"PingFang SC","Microsoft YaHei",sans-serif;
}

*,*::before,*::after{box-sizing:border-box}

html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}

body{
  margin:0;
  font-family:var(--font);
  font-size:16px;
  line-height:1.65;
  color:var(--text);
  background:#fff;
}

img,svg{max-width:100%;display:block}
a{color:var(--steel-500);text-decoration:none}
a:hover{text-decoration:underline}

h1,h2,h3,h4{line-height:1.2;margin:0 0 .5em;color:var(--ink);letter-spacing:-.015em}
h1{font-size:clamp(2rem,4.4vw,3.1rem);font-weight:800}
h2{font-size:clamp(1.5rem,2.6vw,2.05rem);font-weight:750}
h3{font-size:1.15rem;font-weight:700}
p{margin:0 0 1em}

:focus-visible{outline:3px solid var(--accent);outline-offset:2px}

.container{width:100%;max-width:var(--container);margin:0 auto;padding:0 22px}

.skip-link{position:absolute;left:-9999px;top:0;background:var(--ink);color:#fff;padding:10px 16px;z-index:100}
.skip-link:focus{left:12px;top:12px}

/* ---------- header ---------- */
.site-header{
  position:sticky;top:0;z-index:50;
  background:rgba(255,255,255,.96);
  backdrop-filter:blur(8px);
  border-bottom:1px solid var(--line);
}
.site-header.is-stuck{box-shadow:var(--shadow-sm)}
.header-inner{display:flex;align-items:center;gap:18px;min-height:70px}

.brand{display:flex;align-items:center;gap:11px;color:inherit}
.brand:hover{text-decoration:none}
.brand-mark{width:38px;height:38px;flex:0 0 auto}
.brand-text{display:flex;flex-direction:column;line-height:1.15}
.brand-name{font-weight:800;font-size:1.02rem;color:var(--ink);letter-spacing:-.01em}
.brand-sub{font-size:.72rem;color:var(--muted);letter-spacing:.08em;text-transform:uppercase}

.nav{margin-left:auto;display:flex;align-items:center;gap:4px}
.nav a{
  color:var(--text);font-size:.93rem;font-weight:550;
  padding:9px 13px;border-radius:8px;
}
.nav a:hover{background:var(--soft);text-decoration:none}
.nav a[aria-current="page"]{color:var(--steel-500);background:var(--soft)}

.header-cta{margin-left:8px}
.nav-toggle{
  display:none;margin-left:auto;background:none;border:1px solid var(--line);
  border-radius:8px;padding:8px 10px;cursor:pointer;color:var(--ink);
}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;gap:8px;
  padding:12px 22px;border-radius:9px;
  font-weight:650;font-size:.95rem;
  border:1px solid transparent;cursor:pointer;
  transition:transform .12s ease,background .15s ease,border-color .15s ease;
}
.btn:hover{text-decoration:none;transform:translateY(-1px)}
.btn-primary{background:var(--steel);color:#fff}
.btn-primary:hover{background:var(--steel-700)}
.btn-accent{background:var(--accent);color:#1a1206}
.btn-accent:hover{background:#b77a15}
.btn-ghost{background:transparent;color:#fff;border-color:rgba(255,255,255,.4)}
.btn-ghost:hover{background:rgba(255,255,255,.1)}
.btn-outline{background:#fff;color:var(--steel);border-color:var(--line)}
.btn-outline:hover{border-color:var(--steel-500)}
.btn-sm{padding:9px 16px;font-size:.88rem}

/* ---------- layout blocks ---------- */
section{padding:74px 0}
.section-soft{background:var(--soft);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.section-ink{background:var(--ink);color:#c9d4de}
.section-ink h2,.section-ink h3{color:#fff}
.eyebrow{
  display:block;font-size:.74rem;font-weight:700;letter-spacing:.16em;
  text-transform:uppercase;color:var(--accent);margin-bottom:14px;
}
.section-head{max-width:760px;margin-bottom:42px}
.section-head p{color:var(--muted);font-size:1.06rem;margin-bottom:0}
.section-ink .section-head p{color:#9fb0bf}

/* ---------- hero ---------- */
.hero{
  position:relative;overflow:hidden;
  background:
    radial-gradient(1000px 420px at 12% -10%,rgba(28,91,147,.55),transparent 62%),
    linear-gradient(160deg,#0a1218 0%,#0f2a41 58%,#123a5e 100%);
  color:#dbe6ef;padding:88px 0 76px;
}
.hero::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:linear-gradient(rgba(255,255,255,.05) 1px,transparent 1px),
                   linear-gradient(90deg,rgba(255,255,255,.05) 1px,transparent 1px);
  background-size:46px 46px;
  mask-image:radial-gradient(circle at 70% 20%,#000 20%,transparent 78%);
  -webkit-mask-image:radial-gradient(circle at 70% 20%,#000 20%,transparent 78%);
}
.hero .container{position:relative;z-index:1}
.hero-grid{display:grid;grid-template-columns:1.35fr .85fr;gap:52px;align-items:center}
.hero h1{color:#fff;margin-bottom:18px}
.hero-lead{font-size:1.1rem;color:#bccbd8;max-width:60ch;margin-bottom:28px}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-bottom:26px}
.hero-note{font-size:.86rem;color:#8fa3b4;margin:0}

.fact-card{
  background:rgba(255,255,255,.055);
  border:1px solid rgba(255,255,255,.14);
  border-radius:var(--radius);
  padding:24px 24px 12px;
}
.fact-card h2{font-size:.8rem;letter-spacing:.14em;text-transform:uppercase;color:#9fb3c4;font-weight:700;margin-bottom:16px}
.fact-list{list-style:none;margin:0;padding:0}
.fact-list li{
  display:flex;gap:12px;align-items:flex-start;
  padding:11px 0;border-top:1px solid rgba(255,255,255,.1);
  font-size:.94rem;color:#d7e2ec;
}
.fact-list li:first-child{border-top:0}
.fact-list strong{color:#fff;font-weight:700}
.fact-key{flex:0 0 34%;color:#93a7b8;font-size:.82rem;text-transform:uppercase;letter-spacing:.06em;padding-top:2px}

/* ---------- stat band ---------- */
.stat-band{background:var(--steel);color:#dce7f1;padding:26px 0}
.stat-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px;text-align:center}
.stat strong{display:block;font-size:1.5rem;color:#fff;font-weight:800;letter-spacing:-.02em}
.stat span{font-size:.82rem;letter-spacing:.06em;text-transform:uppercase;color:#a8bed2}

/* ---------- cards & grids ---------- */
.grid{display:grid;gap:22px}
.grid-2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid-3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid-4{grid-template-columns:repeat(4,minmax(0,1fr))}

.card{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:26px 24px;box-shadow:var(--shadow-sm);
  transition:box-shadow .18s ease,transform .18s ease,border-color .18s ease;
}
.card:hover{box-shadow:var(--shadow-md);transform:translateY(-2px);border-color:#cfd8e2}
.card h3{margin-bottom:10px}
.card p{color:var(--muted);font-size:.95rem;margin-bottom:0}
.card .icon{width:30px;height:30px;color:var(--steel-500);margin-bottom:16px}

/* check list */
.checklist{list-style:none;margin:0;padding:0}
.checklist li{position:relative;padding:7px 0 7px 28px;color:var(--muted);font-size:.95rem}
.checklist li::before{
  content:"";position:absolute;left:2px;top:14px;width:11px;height:6px;
  border-left:2px solid var(--accent);border-bottom:2px solid var(--accent);
  transform:rotate(-45deg);
}

/* product cards */
.product-card{display:flex;flex-direction:column}
.product-card .tagline{font-size:.78rem;letter-spacing:.1em;text-transform:uppercase;color:var(--accent);font-weight:700;margin-bottom:8px}
.series-list{list-style:none;margin:14px 0 18px;padding:0}
.series-list li{
  font-size:.9rem;color:var(--muted);
  padding:6px 0 6px 16px;position:relative;border-top:1px dashed var(--line);
}
.series-list li:first-child{border-top:0}
.series-list li::before{content:"";position:absolute;left:0;top:15px;width:5px;height:5px;border-radius:50%;background:var(--steel-500);opacity:.6}
.product-card .card-link{margin-top:auto;font-weight:650;font-size:.9rem}

/* split section */
.split{display:grid;grid-template-columns:1fr 1fr;gap:52px;align-items:start}
.split-narrow{grid-template-columns:.9fr 1.1fr}

/* process steps */
.steps{counter-reset:step;display:grid;gap:0}
.step{
  position:relative;padding:20px 0 20px 62px;border-top:1px solid var(--line);
}
.step:last-child{border-bottom:1px solid var(--line)}
.step::before{
  counter-increment:step;content:counter(step,decimal-leading-zero);
  position:absolute;left:0;top:20px;
  font-size:.8rem;font-weight:800;color:var(--accent);letter-spacing:.06em;
  border:1px solid var(--accent-soft);background:#fffdf8;
  border-radius:8px;padding:5px 9px;
}
.step h3{margin-bottom:6px;font-size:1.02rem}
.step p{margin-bottom:0;color:var(--muted);font-size:.94rem}

/* data table */
.table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:var(--radius);background:#fff}
table{width:100%;border-collapse:collapse;font-size:.93rem}
caption{text-align:left;padding:16px 18px 0;font-weight:700;color:var(--ink)}
th,td{text-align:left;padding:12px 18px;border-bottom:1px solid var(--line);vertical-align:top}
th{background:var(--soft);font-size:.78rem;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);font-weight:700}
tbody tr:last-child td{border-bottom:0}
td code{font-size:.86rem;background:var(--soft);padding:2px 6px;border-radius:5px;border:1px solid var(--line)}

/* notice */
.notice{
  border-left:3px solid var(--accent);background:#fffdf7;
  padding:14px 18px;border-radius:0 8px 8px 0;font-size:.92rem;color:#6b5940;
}

/* contact */
.contact-grid{display:grid;grid-template-columns:1fr 1.05fr;gap:46px;align-items:start}
.contact-detail{list-style:none;margin:0 0 22px;padding:0}
.contact-detail li{display:flex;gap:14px;padding:13px 0;border-bottom:1px solid var(--line);font-size:.96rem}
.contact-detail .k{flex:0 0 92px;color:var(--muted);font-size:.82rem;text-transform:uppercase;letter-spacing:.07em;padding-top:3px}
.contact-detail .v{color:var(--ink);font-weight:550}
.contact-detail .v a{color:var(--steel-500)}

form{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:26px;box-shadow:var(--shadow-sm)}
.field{margin-bottom:16px}
.field label{display:block;font-size:.82rem;font-weight:650;color:var(--ink);margin-bottom:6px;letter-spacing:.02em}
.field input,.field select,.field textarea{
  width:100%;padding:11px 13px;font-family:inherit;font-size:.95rem;color:var(--text);
  border:1px solid var(--line);border-radius:8px;background:#fff;
}
.field textarea{min-height:120px;resize:vertical}
.field input:focus,.field select:focus,.field textarea:focus{border-color:var(--steel-500);outline:none;box-shadow:0 0 0 3px rgba(28,91,147,.12)}
.field-row{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.form-note{font-size:.82rem;color:var(--muted);margin:14px 0 0}
.form-status{margin-top:14px;font-size:.9rem;font-weight:600;color:var(--steel-500)}
.required{color:var(--accent)}

/* footer */
.site-footer{background:var(--ink);color:#93a7b8;padding:52px 0 28px;font-size:.92rem}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:38px;margin-bottom:34px}
.site-footer h3{font-size:.8rem;letter-spacing:.12em;text-transform:uppercase;color:#fff;margin-bottom:14px}
.site-footer a{color:#b9c9d7}
.footer-list{list-style:none;margin:0;padding:0}
.footer-list li{padding:5px 0}
.footer-bottom{
  border-top:1px solid rgba(255,255,255,.12);padding-top:20px;
  display:flex;flex-wrap:wrap;gap:12px;justify-content:space-between;font-size:.84rem;color:#7c8fa1;
}

/* page hero (sub pages) */
.page-hero{background:linear-gradient(160deg,#0c1b28,#123a5e);color:#cfdbe6;padding:58px 0}
.page-hero h1{color:#fff;margin-bottom:12px;font-size:clamp(1.8rem,3.4vw,2.5rem)}
.page-hero p{color:#a9bccc;max-width:70ch;margin-bottom:0}
.breadcrumb{font-size:.82rem;color:#8fa3b4;margin-bottom:14px}
.breadcrumb a{color:#b9c9d7}

@media (max-width:960px){
  .hero-grid,.split,.split-narrow,.contact-grid{grid-template-columns:1fr}
  .grid-4{grid-template-columns:repeat(2,minmax(0,1fr))}
  .grid-3{grid-template-columns:repeat(2,minmax(0,1fr))}
  .stat-grid{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:1fr 1fr}
}

@media (max-width:700px){
  section{padding:54px 0}
  .nav{
    display:none;position:absolute;left:0;right:0;top:100%;
    background:#fff;border-bottom:1px solid var(--line);
    flex-direction:column;align-items:stretch;gap:0;padding:10px 16px 18px;
    box-shadow:var(--shadow-md);
  }
  .nav.is-open{display:flex}
  .nav a{padding:12px 8px;border-bottom:1px solid var(--line)}
  .nav-toggle{display:block}
  .header-cta{display:none}
  .grid-2,.grid-3,.grid-4{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
  .field-row{grid-template-columns:1fr}
  .hero{padding:64px 0 56px}
}