/* =====================================================================
   HAOXIN HEAVY INDUSTRIES — 站点样式
   设计基线:工业 B2B,品牌红 + 深炭灰,大图 + 清晰信息层级
   ===================================================================== */

:root{
  --red:#C8102E;
  --red-dark:#A00C24;
  --ink:#111820;
  --ink-2:#1C2530;
  --slate:#4A5766;
  --muted:#6B7887;
  --line:#DCE1E7;
  --line-2:#EDEFF2;
  --bg:#FFFFFF;
  --bg-soft:#F5F6F7;
  --bg-dark:#0E141B;
  --radius:3px;
  --wrap:1240px;
  --shadow:0 18px 40px -24px rgba(16,24,34,.45);
  --ease:cubic-bezier(.2,.7,.3,1);
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;background:var(--bg);color:var(--ink);
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,"Microsoft YaHei","PingFang SC",sans-serif;
  font-size:16px;line-height:1.65;-webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;height:auto}
a{color:inherit;text-decoration:none}
button{font:inherit;cursor:pointer}
h1,h2,h3,h4{margin:0;font-weight:700;letter-spacing:-.02em;line-height:1.15}
p{margin:0}
ul{margin:0;padding:0;list-style:none}

.wrap{width:100%;max-width:var(--wrap);margin:0 auto;padding:0 24px}
.section{padding:96px 0}
.section--tight{padding:64px 0}
.section--soft{background:var(--bg-soft)}
.section--dark{background:var(--bg-dark);color:#fff}

.eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  font-size:12px;font-weight:700;letter-spacing:.16em;text-transform:uppercase;
  color:var(--red);margin-bottom:18px;
}
.eyebrow::before{content:"";width:26px;height:2px;background:var(--red);display:block}
.section--dark .eyebrow{color:#FF5A6E}
.section--dark .eyebrow::before{background:#FF5A6E}

.h-xl{font-size:clamp(38px,5.2vw,64px)}
.h-lg{font-size:clamp(28px,3.4vw,42px)}
.h-md{font-size:clamp(20px,2vw,26px)}
.lead{font-size:17px;color:var(--slate);max-width:62ch}
.section--dark .lead{color:#B9C3CE}

.sec-head{display:flex;align-items:flex-end;justify-content:space-between;gap:40px;margin-bottom:44px}
.sec-head .lead{margin-top:16px}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:10px;
  height:50px;padding:0 26px;border:0;border-radius:var(--radius);
  font-size:14px;font-weight:700;letter-spacing:.04em;text-transform:uppercase;
  transition:background .18s var(--ease),color .18s var(--ease),transform .18s var(--ease);
  white-space:nowrap;
}
.btn--primary{background:var(--red);color:#fff}
.btn--primary:hover{background:var(--red-dark)}
.btn--dark{background:var(--ink);color:#fff}
.btn--dark:hover{background:#000}
.btn--ghost{background:transparent;color:#fff;border:1px solid rgba(255,255,255,.45)}
.btn--ghost:hover{background:rgba(255,255,255,.12);border-color:#fff}
.btn--line{background:transparent;color:var(--ink);border:1px solid var(--line)}
.btn--line:hover{border-color:var(--ink)}
.btn--sm{height:40px;padding:0 18px;font-size:12px}
.btn:active{transform:translateY(1px)}

/* ---------- 顶部信息条 ---------- */
.topbar{background:var(--bg-dark);color:#9BA7B4;font-size:13px}
.topbar .wrap{display:flex;align-items:center;justify-content:space-between;height:40px;gap:24px}
.topbar a:hover{color:#fff}
.topbar__list{display:flex;gap:26px}
.topbar__list li{display:flex;align-items:center;gap:8px;white-space:nowrap}
.topbar svg{width:14px;height:14px;opacity:.7}

/* ---------- 语言切换 ---------- */
.lang{display:flex;align-items:center;gap:2px}
.lang button{
  background:none;border:0;color:#9BA7B4;font-size:12px;font-weight:600;
  padding:4px 8px;border-radius:2px;letter-spacing:.04em;
}
.lang button[aria-pressed="true"]{color:#fff;background:rgba(255,255,255,.12)}
.lang button:hover{color:#fff}

/* ---------- 主导航 ---------- */
.header{position:sticky;top:0;z-index:50;background:#fff;border-bottom:1px solid var(--line-2);transition:box-shadow .2s}
.header.is-stuck{box-shadow:0 8px 24px -18px rgba(16,24,34,.6)}
.header .wrap{display:flex;align-items:center;justify-content:space-between;height:76px;gap:32px}

.logo{display:flex;align-items:center;gap:12px}
.logo__img{display:block;height:42px;width:auto;max-width:250px}
.footer .logo__img{height:32px;max-width:200px}
.logo__mark{
  width:44px;height:44px;border:2.5px solid var(--red);border-radius:50% 50% 50% 50%/58% 58% 42% 42%;
  display:grid;place-items:center;color:var(--red);font-weight:800;font-size:13px;letter-spacing:-.03em;
}
.logo__text{line-height:1.05}
.logo__name{display:block;font-size:19px;font-weight:800;letter-spacing:.02em}
.logo__sub{display:block;font-size:9.5px;letter-spacing:.22em;color:var(--muted);font-weight:600;margin-top:3px}

.nav{display:flex;align-items:center;gap:4px}
.nav a{
  position:relative;padding:10px 14px;font-size:14.5px;font-weight:600;color:var(--ink-2);
  border-radius:var(--radius);
}
.nav a:hover{color:var(--red)}
.nav a.is-active{color:var(--red)}
.nav a.is-active::after{
  content:"";position:absolute;left:14px;right:14px;bottom:2px;height:2px;background:var(--red);
}
.header__cta{display:flex;align-items:center;gap:12px}

.burger{display:none;width:44px;height:44px;border:1px solid var(--line);background:#fff;border-radius:var(--radius);align-items:center;justify-content:center}
.burger span{display:block;width:18px;height:2px;background:var(--ink);position:relative}
.burger span::before,.burger span::after{content:"";position:absolute;left:0;width:18px;height:2px;background:var(--ink)}
.burger span::before{top:-6px}
.burger span::after{top:6px}

/* ---------- 首屏 ---------- */
.hero{position:relative;background:var(--bg-dark);color:#fff;overflow:hidden}
.hero__media{position:absolute;inset:0}
.hero__media img{width:100%;height:100%;object-fit:cover;object-position:center 60%}
.hero__media::after{
  content:"";position:absolute;inset:0;
  background:
    linear-gradient(to top,rgba(9,13,18,.96) 0%,rgba(9,13,18,.55) 22%,rgba(9,13,18,0) 46%),
    linear-gradient(100deg,rgba(9,13,18,.94) 0%,rgba(9,13,18,.76) 42%,rgba(9,13,18,.22) 100%);
}
.hero .wrap{position:relative;padding-top:110px;padding-bottom:0}
.hero__inner{max-width:660px;padding-bottom:72px}
.hero h1{margin-bottom:22px}
.hero h1 em{font-style:normal;color:#FF5A6E}
.hero__sub{font-size:18px;color:#C6CFD9;max-width:54ch;margin-bottom:34px}
.hero__actions{display:flex;flex-wrap:wrap;gap:14px}
.hero__stats{
  position:relative;display:grid;grid-template-columns:repeat(4,1fr);
  border-top:1px solid rgba(255,255,255,.16);
}
.hero__stats div{padding:26px 0 28px;border-right:1px solid rgba(255,255,255,.1)}
.hero__stats div:last-child{border-right:0}
.hero__stats b{display:block;font-size:30px;font-weight:800;letter-spacing:-.02em}
.hero__stats span{display:block;font-size:12.5px;color:#9BA7B4;letter-spacing:.06em;text-transform:uppercase;margin-top:4px}

/* ---------- 分类 ---------- */
.cats{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.cat{
  position:relative;display:flex;flex-direction:column;justify-content:flex-end;
  min-height:340px;padding:30px;border-radius:var(--radius);overflow:hidden;color:#fff;
  background:var(--ink-2);isolation:isolate;
}
.cat img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;z-index:-2;transition:transform .5s var(--ease)}
.cat--plain{background:
  radial-gradient(120% 100% at 100% 0%,rgba(200,16,46,.22),transparent 55%),
  repeating-linear-gradient(45deg,#151C25 0 14px,#12181F 14px 28px);}
.cat--plain::after{background:linear-gradient(to top,rgba(9,13,18,.9),rgba(9,13,18,.2))}
.cat::after{content:"";position:absolute;inset:0;z-index:-1;background:linear-gradient(to top,rgba(9,13,18,.92) 10%,rgba(9,13,18,.15) 70%)}
.cat:hover img{transform:scale(1.05)}
.cat h3{font-size:22px;margin-bottom:8px}
.cat p{font-size:14px;color:#C6CFD9;margin-bottom:18px}
.cat__link{display:inline-flex;align-items:center;gap:8px;font-size:12.5px;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:#fff}
.cat__link::after{content:"→";transition:transform .2s var(--ease)}
.cat:hover .cat__link::after{transform:translateX(5px)}

/* ---------- 产品卡片 ---------- */
.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.card{
  display:flex;flex-direction:column;background:#fff;border:1px solid var(--line);
  border-radius:var(--radius);overflow:hidden;transition:border-color .2s,box-shadow .25s,transform .25s var(--ease);
}
.card:hover{border-color:#C3CBD5;box-shadow:var(--shadow);transform:translateY(-3px)}
.card__media{position:relative;aspect-ratio:4/3;background:#EFF1F3;overflow:hidden}
.card__media img{width:100%;height:100%;object-fit:cover;transition:transform .5s var(--ease)}
.card:hover .card__media img{transform:scale(1.04)}
.card__tag{
  position:absolute;left:14px;top:14px;background:rgba(255,255,255,.94);color:var(--ink);
  font-size:11px;font-weight:700;letter-spacing:.1em;text-transform:uppercase;
  padding:5px 9px;border-radius:2px;
}
.card__body{padding:22px 22px 24px;display:flex;flex-direction:column;flex:1}
.card__model{font-size:12px;font-weight:700;letter-spacing:.14em;color:var(--red);text-transform:uppercase;margin-bottom:6px}
.card h3{font-size:19px;margin-bottom:12px}
.card__specs{display:grid;gap:6px;margin-bottom:18px}
.card__specs li{display:flex;justify-content:space-between;gap:12px;font-size:13.5px;color:var(--slate);border-bottom:1px dotted var(--line);padding-bottom:6px}
.card__specs b{color:var(--ink);font-weight:600}
.card__foot{margin-top:auto;display:flex;align-items:center;justify-content:space-between}
.card__more{font-size:13px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--ink)}
.card__more::after{content:" →"}
.card:hover .card__more{color:var(--red)}
.card__note{font-size:13px;color:var(--muted)}

/* ---------- 优势 ---------- */
.feats{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--line);border:1px solid var(--line)}
.feat{background:#fff;padding:34px 28px}
.feat__n{font-size:12px;font-weight:800;letter-spacing:.16em;color:var(--red);margin-bottom:16px}
.feat h3{font-size:17px;margin-bottom:10px}
.feat p{font-size:14px;color:var(--muted)}

/* ---------- 应用场景 ---------- */
.apps{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.app{
  display:flex;align-items:center;gap:16px;padding:22px 24px;background:#fff;
  border:1px solid var(--line);border-radius:var(--radius);transition:border-color .2s,transform .2s
}
.app:hover{border-color:var(--red);transform:translateY(-2px)}
.app__ico{width:38px;height:38px;flex:0 0 38px;color:var(--red)}
.app h3{font-size:16px;margin-bottom:2px}
.app p{font-size:13px;color:var(--muted)}

/* ---------- 分栏 ---------- */
.split{display:grid;grid-template-columns:1.05fr .95fr;gap:64px;align-items:center}
.split__media{position:relative;border-radius:var(--radius);overflow:hidden;aspect-ratio:4/3;background:#E7EAEE}
.split__media img{width:100%;height:100%;object-fit:cover}
.split ul{display:grid;gap:14px;margin-top:26px}
.split ul li{display:flex;gap:12px;font-size:15px;color:var(--slate)}
.split ul li::before{content:"";flex:0 0 6px;height:6px;margin-top:9px;background:var(--red)}

/* ---------- 询盘 ---------- */
.quote{background:var(--bg-dark);color:#fff;position:relative;overflow:hidden}
.quote::before{
  content:"";position:absolute;right:-10%;top:-30%;width:60%;height:160%;
  background:radial-gradient(circle,rgba(200,16,46,.22),transparent 62%);
}
.quote .wrap{position:relative;display:grid;grid-template-columns:.9fr 1.1fr;gap:64px;align-items:start}
.quote__list{display:grid;gap:14px;margin-top:28px}
.quote__list li{display:flex;gap:12px;font-size:14.5px;color:#B9C3CE}
.quote__list li::before{content:"✓";color:#4ADE80;font-weight:700}

.form{background:#fff;color:var(--ink);padding:32px;border-radius:var(--radius);box-shadow:0 30px 60px -30px rgba(0,0,0,.6)}
.form__row{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.field{margin-bottom:14px}
.field label{display:block;font-size:12px;font-weight:700;letter-spacing:.06em;text-transform:uppercase;color:var(--slate);margin-bottom:6px}
.field input,.field select,.field textarea{
  width:100%;padding:12px 14px;border:1px solid var(--line);border-radius:var(--radius);
  font:inherit;font-size:15px;color:var(--ink);background:#fff;transition:border-color .15s,box-shadow .15s;
}
.field input:focus,.field select:focus,.field textarea:focus{
  outline:0;border-color:var(--ink);box-shadow:0 0 0 3px rgba(17,24,32,.07);
}
.field textarea{resize:vertical;min-height:96px}
.form__note{font-size:12px;color:var(--muted);margin-top:12px}
.form__ok{display:none;padding:26px;border:1px solid #BFE8CB;background:#F2FBF5;border-radius:var(--radius)}
.form__ok h3{color:#1E7A3C;margin-bottom:8px}
.form.is-sent .form__body{display:none}
.form.is-sent .form__ok{display:block}

/* ---------- 页脚 ---------- */
.footer{background:#0A0F14;color:#8E99A6;padding:72px 0 0;font-size:14px}
.footer__grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.2fr;gap:48px;padding-bottom:56px}
.footer h4{color:#fff;font-size:13px;letter-spacing:.14em;text-transform:uppercase;margin-bottom:18px}
.footer a:hover{color:#fff}
.footer ul{display:grid;gap:10px}
.footer .logo__name{color:#fff}
.footer .logo__sub{color:#7A8794}
.footer__about{margin-top:18px;max-width:34ch;line-height:1.7;color:#8E99A6}
.footer__contact li{display:flex;gap:10px;line-height:1.55}
.footer__bar{
  border-top:1px solid rgba(255,255,255,.08);padding:20px 0;display:flex;
  justify-content:space-between;gap:20px;font-size:12.5px;color:#6B7887;flex-wrap:wrap;
}

/* ---------- 内页 ---------- */
.page-head{background:var(--bg-soft);border-bottom:1px solid var(--line);padding:56px 0 48px}
.crumbs{display:flex;gap:8px;font-size:13px;color:var(--muted);margin-bottom:18px}
.crumbs a:hover{color:var(--red)}
.crumbs span{color:#C3CBD5}

.toolbar{display:flex;align-items:center;justify-content:space-between;gap:20px;flex-wrap:wrap;margin-bottom:32px}
.chips{display:flex;gap:8px;flex-wrap:wrap}
.chip{
  border:1px solid var(--line);background:#fff;padding:9px 16px;border-radius:999px;
  font-size:13.5px;font-weight:600;color:var(--slate);transition:all .16s;
}
.chip:hover{border-color:var(--ink);color:var(--ink)}
.chip[aria-pressed="true"]{background:var(--ink);border-color:var(--ink);color:#fff}
.toolbar__count{font-size:13.5px;color:var(--muted)}

/* 产品详情 */
.pdp{display:grid;grid-template-columns:1.15fr .85fr;gap:56px;align-items:start}
.pdp__media{background:#F1F3F5;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;aspect-ratio:4/3}
.pdp__media img{width:100%;height:100%;object-fit:cover}
.pdp__thumbs{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin-top:10px}
.pdp__thumbs button{padding:0;border:1px solid var(--line);background:#fff;border-radius:2px;overflow:hidden;aspect-ratio:1;opacity:.75;transition:opacity .16s,border-color .16s}
.pdp__thumbs button:hover,.pdp__thumbs button[aria-pressed="true"]{opacity:1;border-color:var(--ink)}
.pdp__thumbs img{width:100%;height:100%;object-fit:cover}
.pdp h1{font-size:clamp(30px,3.4vw,40px);margin:6px 0 14px}
.pdp__model{font-size:13px;font-weight:800;letter-spacing:.16em;text-transform:uppercase;color:var(--red)}
.pdp__lead{color:var(--slate);margin-bottom:24px}
.pdp__keys{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--line);border:1px solid var(--line);margin-bottom:24px}
.pdp__keys div{background:#fff;padding:16px 14px}
.pdp__keys span{display:block;font-size:11px;letter-spacing:.1em;text-transform:uppercase;color:var(--muted);margin-bottom:4px}
.pdp__keys b{font-size:17px;letter-spacing:-.01em}
.pdp__actions{display:flex;gap:12px;flex-wrap:wrap}

.spec-table{width:100%;border-collapse:collapse;font-size:14.5px}
.spec-table tr{border-bottom:1px solid var(--line-2)}
.spec-table tr:nth-child(odd){background:#FAFBFC}
.spec-table th{text-align:left;font-weight:600;color:var(--slate);padding:12px 16px;width:52%}
.spec-table td{padding:12px 16px;font-weight:600}

.tabs{display:flex;gap:6px;border-bottom:1px solid var(--line);margin-bottom:28px;flex-wrap:wrap}
.tabs button{
  background:none;border:0;padding:14px 18px;font-size:14px;font-weight:700;color:var(--muted);
  border-bottom:2px solid transparent;margin-bottom:-1px;
}
.tabs button[aria-selected="true"]{color:var(--ink);border-bottom-color:var(--red)}
.tabpanel[hidden]{display:none}

.faq{display:grid;gap:1px;background:var(--line);border:1px solid var(--line)}
.faq details{background:#fff;padding:22px 24px}
.faq summary{cursor:pointer;font-weight:700;font-size:15.5px;list-style:none;display:flex;justify-content:space-between;gap:16px}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";color:var(--red);font-weight:700;font-size:19px;line-height:1}
.faq details[open] summary::after{content:"–"}
.faq p{margin-top:12px;color:var(--slate);font-size:14.5px}

.notice{display:flex;gap:12px;padding:16px 18px;background:#FFF8E6;border:1px solid #F2E0B0;border-radius:var(--radius);font-size:13.5px;color:#6B5A1E}

/* ---------- 响应式 ---------- */
@media (max-width:1080px){
  .nav{display:none}
  .burger{display:flex}
  .grid-4{grid-template-columns:repeat(2,1fr)}
  .grid-3,.cats,.apps{grid-template-columns:1fr 1fr}
  .feats{grid-template-columns:1fr 1fr}
  .split,.pdp,.quote .wrap{grid-template-columns:1fr;gap:36px}
  .hero__stats{grid-template-columns:1fr 1fr}
}
@media (max-width:720px){
  .section{padding:64px 0}
  .topbar{display:none}
  .header .wrap{height:64px}
  .hero .wrap{padding-top:72px}
  .hero__inner{padding-bottom:48px}
  .hero__stats{grid-template-columns:1fr 1fr}
  .grid-4,.grid-3,.cats,.apps,.feats{grid-template-columns:1fr}
  .form__row{grid-template-columns:1fr}
  .pdp__keys{grid-template-columns:1fr 1fr}
  .footer__grid{grid-template-columns:1fr;gap:36px}
  .sec-head{flex-direction:column;align-items:flex-start;gap:20px}
  .quote::before{display:none}
}

/* ---------- 占位图与移动导航（补充） ---------- */
.ph{
  position:absolute;inset:0;display:grid;place-items:center;text-align:center;padding:18px;
  background:
    repeating-linear-gradient(45deg,#EDEFF2 0 12px,#E8EBEF 12px 24px);
  color:#7C8895;font-size:12px;font-weight:700;letter-spacing:.12em;text-transform:uppercase;
}
.pdp__media .ph{font-size:14px}

@media (max-width:1080px){
  .nav.is-open{
    display:flex;flex-direction:column;align-items:stretch;gap:2px;
    position:absolute;top:100%;left:0;right:0;z-index:60;
    background:#fff;border-bottom:1px solid var(--line);padding:12px 24px 20px;
    box-shadow:0 24px 40px -30px rgba(16,24,34,.6);
  }
  .nav.is-open a{padding:13px 6px;border-bottom:1px solid var(--line-2)}
  .header{position:sticky}
  .header .wrap{position:relative}
}