/* HEBEI HONGFENG TRADE CO.,LTD — Seamless & Alloy Steel Pipe
   Design system: dark industrial / engineering blueprint.
   Deliberately different from the GAOYANG site (light navy + orange cards). */

:root{
  --ink:#0a0d10;
  --panel:#121820;
  --panel-2:#161f28;
  --line:#243039;
  --line-soft:#1b242c;
  --text:#e9eff5;
  --muted:#8ea0ae;
  --lime:#b6ff3c;
  --lime-dark:#8dc42c;
  --white:#fff;
  --wrap:1240px;
  --mono:ui-monospace,SFMono-Regular,Menlo,Consolas,"Liberation Mono",monospace;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;background:var(--ink);color:var(--text);
  font-family:"Inter","Segoe UI",Roboto,-apple-system,"Helvetica Neue",Arial,"Noto Sans",sans-serif;
  font-size:16px;line-height:1.65;-webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 22px}
h1,h2,h3,h4{margin:0 0 14px;line-height:1.15;letter-spacing:-.02em}
h1{font-size:clamp(34px,5.2vw,62px);font-weight:800}
h2{font-size:clamp(26px,3.4vw,40px);font-weight:800}
h3{font-size:20px;font-weight:700}
p{margin:0 0 14px;color:#c8d4de}
.muted{color:var(--muted)}
.mono{font-family:var(--mono);letter-spacing:.08em;text-transform:uppercase;font-size:12px}
.eyebrow{color:var(--lime);font-family:var(--mono);font-size:12px;letter-spacing:.22em;text-transform:uppercase;margin-bottom:14px;display:block}

/* ---------- header ---------- */
.topbar{position:sticky;top:0;z-index:80;background:rgba(10,13,16,.86);backdrop-filter:blur(14px);border-bottom:1px solid var(--line-soft)}
.topbar .wrap{display:flex;align-items:center;gap:26px;height:66px}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;letter-spacing:.02em;font-size:17px;white-space:nowrap}
.brand .mark{width:30px;height:30px;border:2px solid var(--lime);border-radius:7px;display:grid;place-items:center;font-family:var(--mono);font-size:12px;color:var(--lime)}
.brand small{display:block;font-family:var(--mono);font-size:10px;letter-spacing:.16em;color:var(--muted);font-weight:500}
nav.main{margin-left:auto;display:flex;gap:22px;font-size:14.5px}
nav.main a{color:#c3d0da;padding:6px 0;border-bottom:2px solid transparent}
nav.main a:hover{color:var(--lime);border-color:var(--lime)}
.head-cta{display:flex;gap:10px;align-items:center}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:9px;padding:12px 20px;border-radius:8px;font-weight:700;font-size:14.5px;border:1px solid transparent;transition:.16s;white-space:nowrap}
.btn-lime{background:var(--lime);color:#0d1400}
.btn-lime:hover{background:var(--lime-dark)}
.btn-line{border-color:var(--line);color:var(--text);background:transparent}
.btn-line:hover{border-color:var(--lime);color:var(--lime)}
.btn-wa{background:#25d366;color:#06301a}
.btn-wa:hover{background:#1eb457}
.menu-toggle{display:none;margin-left:auto;background:none;border:1px solid var(--line);color:var(--text);border-radius:7px;padding:8px 11px}

/* ---------- hero ---------- */
.hero{position:relative;overflow:hidden;border-bottom:1px solid var(--line-soft)}
.hero .bg{position:absolute;inset:0;background:url("images/seamlessc-08.jpg") center 35%/cover no-repeat;filter:saturate(.85)}
.hero .scrim{position:absolute;inset:0;background:
   radial-gradient(1100px 520px at 12% 8%,rgba(182,255,60,.10),transparent 60%),
   linear-gradient(180deg,rgba(10,13,16,.62) 0%,rgba(10,13,16,.86) 52%,var(--ink) 100%)}
.hero .grid{position:absolute;inset:0;opacity:.14;
  background-image:linear-gradient(var(--line) 1px,transparent 1px),linear-gradient(90deg,var(--line) 1px,transparent 1px);
  background-size:64px 64px}
.hero .inner{position:relative;padding:104px 0 74px;max-width:900px}
.hero h1 span{color:var(--lime)}
.hero p.lead{font-size:18.5px;color:#d5e0e8;max-width:720px}
.hero-cta{display:flex;gap:12px;flex-wrap:wrap;margin-top:26px}
.ticker{margin-top:44px;border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:13px 0;display:flex;gap:28px;flex-wrap:wrap;font-family:var(--mono);font-size:12px;letter-spacing:.13em;color:#9fb0be;text-transform:uppercase}
.ticker b{color:var(--lime);font-weight:600}

/* ---------- generic section ---------- */
section{padding:78px 0}
section.tight{padding:56px 0}
.band{background:var(--panel);border-top:1px solid var(--line-soft);border-bottom:1px solid var(--line-soft)}
.head{max-width:760px;margin-bottom:40px}

.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.grid-2{display:grid;grid-template-columns:1.05fr .95fr;gap:40px;align-items:center}

.card{background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:24px;transition:.18s}
.card:hover{border-color:#33424e;transform:translateY(-2px)}
.card .tag{font-family:var(--mono);font-size:11px;letter-spacing:.16em;color:var(--lime);text-transform:uppercase;margin-bottom:10px;display:block}
.card p{margin:0;font-size:14.6px;color:#b9c6d1}

.stat{background:linear-gradient(180deg,var(--panel-2),var(--panel));border:1px solid var(--line);border-radius:12px;padding:22px}
.stat .n{font-family:var(--mono);font-size:23px;color:var(--lime);font-weight:600;letter-spacing:-.01em}
.stat .l{font-size:13.6px;color:var(--muted);margin-top:6px}

.split-media{position:relative;border-radius:14px;overflow:hidden;border:1px solid var(--line)}
.split-media img{width:100%;height:100%;object-fit:cover}
.checks{list-style:none;padding:0;margin:0}
.checks li{position:relative;padding-left:30px;margin-bottom:12px;color:#c8d4de;font-size:15.2px}
.checks li::before{content:"";position:absolute;left:0;top:8px;width:14px;height:8px;border-left:2.5px solid var(--lime);border-bottom:2.5px solid var(--lime);transform:rotate(-45deg)}

/* ---------- product cards ---------- */
.prod{background:var(--panel);border:1px solid var(--line);border-radius:14px;overflow:hidden;display:flex;flex-direction:column}
.prod .ph{aspect-ratio:4/3;background:#0e141a;overflow:hidden}
.prod .ph img{width:100%;height:100%;object-fit:cover;transition:.4s}
.prod:hover .ph img{transform:scale(1.05)}
.prod .bd{padding:20px 22px 24px;display:flex;flex-direction:column;gap:8px;flex:1}
.prod h3{margin:0;font-size:18.5px}
.prod .specs{font-family:var(--mono);font-size:11.5px;color:var(--muted);letter-spacing:.06em}
.prod ul{margin:8px 0 0;padding-left:18px;color:#aebbc7;font-size:14.4px}
.prod ul li{margin-bottom:6px}
.prod .go{margin-top:auto;padding-top:14px;font-weight:700;color:var(--lime);font-size:14.4px}

/* ---------- apps ---------- */
.apps{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}
.app{position:relative;border:1px solid var(--line);border-radius:12px;padding:22px 22px 20px;background:
  linear-gradient(135deg,rgba(182,255,60,.07),transparent 55%),var(--panel)}
.app h3{font-size:17.5px;margin-bottom:8px}
.app p{font-size:14.5px;margin:0;color:#b3c0cb}
.app .no{position:absolute;right:18px;top:14px;font-family:var(--mono);font-size:12px;color:#4b5b66}

/* ---------- process ---------- */
.process{counter-reset:step;display:grid;grid-template-columns:repeat(6,1fr);gap:14px}
.step{position:relative;background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:20px 18px 18px}
.step::before{counter-increment:step;content:"0" counter(step);font-family:var(--mono);font-size:12px;color:var(--lime);display:block;margin-bottom:10px}
.step h4{font-size:15.4px;margin:0 0 6px}
.step p{font-size:13.4px;margin:0;color:var(--muted)}

/* ---------- tables ---------- */
.table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:12px;background:var(--panel)}
table{width:100%;border-collapse:collapse;font-size:14.6px;min-width:640px}
th,td{padding:12px 14px;text-align:left;border-bottom:1px solid var(--line-soft)}
th{background:#0f151b;color:var(--lime);font-family:var(--mono);font-size:11.5px;letter-spacing:.14em;text-transform:uppercase;font-weight:600}
tbody tr:hover{background:#131a21}
td .mono,td code{font-family:var(--mono);font-size:13px;color:#cfdae3}

/* ---------- gallery ---------- */
.gallery{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
.gallery figure{margin:0;border:1px solid var(--line);border-radius:12px;overflow:hidden;background:#0e141a}
.gallery img{width:100%;height:230px;object-fit:cover}
.gallery figcaption{padding:11px 14px;font-size:13.4px;color:var(--muted);font-family:var(--mono);letter-spacing:.05em}

/* ---------- faq ---------- */
details.faq{background:var(--panel);border:1px solid var(--line);border-radius:11px;padding:16px 20px;margin-bottom:11px}
details.faq summary{cursor:pointer;font-weight:700;font-size:15.6px;list-style:none}
details.faq summary::-webkit-details-marker{display:none}
details.faq summary::after{content:"+";float:right;color:var(--lime);font-family:var(--mono)}
details.faq[open] summary::after{content:"–"}
details.faq p{margin:12px 0 0;font-size:14.8px;color:#b6c3ce}

/* ---------- contact ---------- */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:36px}
form.inquiry{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:26px}
form.inquiry label{display:block;font-size:13px;color:var(--muted);margin:0 0 6px}
form.inquiry input,form.inquiry select,form.inquiry textarea{
  width:100%;padding:12px 13px;margin-bottom:15px;border-radius:9px;border:1px solid #2a3742;
  background:#0d1319;color:var(--text);font:inherit;font-size:14.6px}
form.inquiry textarea{min-height:118px;resize:vertical}
form.inquiry input:focus,form.inquiry textarea:focus,form.inquiry select:focus{outline:none;border-color:var(--lime)}
.two-col{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.contact-card{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:26px}
.contact-card a{color:var(--lime)}
.contact-line{display:flex;gap:12px;align-items:flex-start;margin-bottom:16px;font-size:15.2px}
.contact-line .ico{width:34px;height:34px;flex:0 0 34px;border:1px solid var(--line);border-radius:9px;display:grid;place-items:center;font-family:var(--mono);font-size:12px;color:var(--lime)}

/* ---------- footer ---------- */
footer{border-top:1px solid var(--line-soft);background:#080b0e;padding:52px 0 34px;font-size:14.4px;color:var(--muted)}
.foot-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:28px;margin-bottom:34px}
footer h4{color:var(--text);font-size:14.6px;font-family:var(--mono);letter-spacing:.14em;text-transform:uppercase;margin-bottom:14px}
footer a:hover{color:var(--lime)}
footer ul{list-style:none;padding:0;margin:0}
footer li{margin-bottom:9px}
.foot-bottom{border-top:1px solid var(--line-soft);padding-top:20px;display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;font-size:13.4px}
.float-wa{position:fixed;right:18px;bottom:18px;z-index:90;background:#25d366;color:#06301a;border-radius:999px;padding:13px 19px;font-weight:800;box-shadow:0 10px 26px rgba(0,0,0,.4);display:flex;align-items:center;gap:9px}

/* ---------- responsive ---------- */
@media (max-width:1040px){
  .grid-4,.process{grid-template-columns:repeat(2,1fr)}
  .grid-2,.contact-grid,.apps{grid-template-columns:1fr}
  .gallery{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:820px){
  nav.main{display:none;position:absolute;top:66px;left:0;right:0;background:#0c1116;border-bottom:1px solid var(--line);flex-direction:column;gap:0;padding:10px 22px}
  nav.main.open{display:flex}
  nav.main a{padding:12px 0;border-bottom:1px solid var(--line-soft)}
  .menu-toggle{display:block}
  .head-cta{display:none}
  .hero .inner{padding:72px 0 56px}
}
@media (max-width:640px){
  .grid-3,.grid-4,.process,.gallery,.two-col{grid-template-columns:1fr}
  section{padding:56px 0}
  .ticker{gap:16px;font-size:11px}
}