/* conveyorchainmanufacturer.com — 工业传动件风 */
:root{
  --ink:#1C232B; --steel:#3A5A78; --paper:#F2F3F1; --line:#C9CDD1;
  --accent:#E8641B; --white:#FFFFFF; --muted:#5B6570;
  --mono:"IBM Plex Mono",ui-monospace,monospace;
  --head:"Barlow Semi Condensed","Arial Narrow",sans-serif;
  --body:"IBM Plex Sans","Helvetica Neue",sans-serif;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:var(--body);color:var(--ink);background:var(--white);line-height:1.65;font-size:16px}
a{color:var(--steel);text-decoration:none}
@media(hover:hover){a:hover{text-decoration:underline}}
.wrap{max-width:1180px;margin:0 auto;padding:0 24px}
h1,h2,h3{font-family:var(--head);line-height:1.2;letter-spacing:.01em}
h1{font-size:44px;font-weight:700}
h2{font-size:30px;font-weight:700;margin-bottom:18px}
h3{font-size:20px;font-weight:600;margin-bottom:10px}
p{margin-bottom:14px}
.muted{color:var(--muted)}
.mono{font-family:var(--mono)}

/* header */
.site-header{background:var(--ink);color:#fff;position:sticky;top:0;z-index:50}
.site-header .wrap{display:flex;align-items:center;justify-content:space-between;height:64px}
.brand{font-family:var(--head);font-weight:700;font-size:22px;color:#fff}
.brand span{color:var(--accent)}
.nav{display:flex;gap:22px}
.nav a{color:#D7DDE3;font-size:15px;font-weight:500}
@media(hover:hover){.nav a:hover{color:#fff}}

/* hero */
.hero{background:var(--ink);color:#fff;padding:56px 0 48px;background-image:linear-gradient(rgba(28,35,43,.97),rgba(28,35,43,.97)),repeating-linear-gradient(0deg,transparent,transparent 23px,rgba(255,255,255,.04) 24px),repeating-linear-gradient(90deg,transparent,transparent 23px,rgba(255,255,255,.04) 24px)}
.hero h1{margin-bottom:12px}
.hero .sub{color:#C6CFD8;font-size:18px;max-width:720px;margin-bottom:26px}
.hero-mini>*{min-width:0}
.hero-mini{display:grid;grid-template-columns:1fr 1fr 1fr auto;gap:10px;max-width:860px;background:#242E38;border:1px solid #3A4653;padding:14px;border-radius:2px}
.hero-mini select,.selector select{background:#fff;border:1px solid var(--line);border-radius:2px;padding:10px 12px;font-size:15px;font-family:var(--body);width:100%}
.btn{display:inline-block;background:var(--accent);color:#fff;font-weight:600;padding:12px 26px;border-radius:2px;border:0;cursor:pointer;font-size:16px;font-family:var(--body)}
@media(hover:hover){.btn:hover{background:#D0570F;color:#fff;text-decoration:none}}
.btn:active{transform:scale(.97)}
.btn-ghost{background:transparent;border:1px solid var(--steel);color:var(--steel)}
@media(hover:hover){.btn-ghost:hover{background:var(--steel);color:#fff}}

/* sections */
.section{padding:52px 0}
.section.alt{background:var(--paper)}
.section-head{display:flex;justify-content:space-between;align-items:baseline;margin-bottom:24px;border-bottom:2px solid var(--ink);padding-bottom:10px}
.section-head .kicker{font-family:var(--mono);font-size:13px;color:var(--muted)}

/* standard strip */
.std-strip{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:0;border:1px solid var(--line);border-radius:2px;overflow:hidden;background:#fff}
.std-strip div{padding:14px 16px;border-right:1px solid var(--line);font-size:14px}
.std-strip div:last-child{border-right:0}
.std-strip .k{font-family:var(--mono);font-weight:600;color:var(--steel)}

/* series grid */
.series-grid>*{min-width:0}
.series-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.series-card{border:1px solid var(--line);border-radius:2px;background:#fff;padding:20px 18px;display:flex;flex-direction:column;gap:8px;min-width:0}
@media(hover:hover){.series-card:hover{border-color:var(--steel)}}
.series-card h3{font-size:19px;margin:0}
.series-card .spec{font-family:var(--mono);font-size:13px;color:var(--muted)}
.series-card p{font-size:14px;color:var(--muted);margin:0;flex:1}
.series-card a{font-weight:600;font-size:14px}

/* selector */
.selector{background:#fff;border:1px solid var(--line);border-radius:2px;padding:26px}
.selector .row>*{min-width:0}
.selector .row{display:grid;grid-template-columns:1fr 1fr 1fr;gap:14px;margin-bottom:18px}
.selector label{font-size:13px;font-weight:600;color:var(--muted);display:block;margin-bottom:6px}
.selector-result{margin-top:18px}
table.spec{width:100%;border-collapse:collapse;font-size:14px;background:#fff}
table.spec th{background:var(--ink);color:#fff;text-align:left;padding:10px 12px;font-family:var(--head);font-weight:600;font-size:15px}
table.spec td{padding:9px 12px;border-bottom:1px solid var(--line)}
table.spec td.num,table.spec th.num{font-family:var(--mono);text-align:right;white-space:nowrap}
table.spec tr:hover td{background:#F7F8F7}
table.spec td.chk,table.spec th.chk{width:36px;text-align:center}

/* steps */
.steps>*{min-width:0}
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;counter-reset:step}
.step{border:1px solid var(--line);border-radius:2px;padding:20px;background:#fff;position:relative}
.step::before{counter-increment:step;content:counter(step,decimal-leading-zero);font-family:var(--mono);font-size:28px;color:var(--accent);font-weight:600;display:block;margin-bottom:8px}

/* two-col */
.two-col>*{min-width:0}
.two-col{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:start}
.fact-list{list-style:none}
.fact-list li{padding:10px 0;border-bottom:1px solid var(--line);display:flex;gap:12px}
.fact-list .fk{font-family:var(--mono);font-size:13px;color:var(--muted);min-width:170px}

/* rfq */
.rfq{background:var(--ink);color:#fff}
.rfq h2{color:#fff}
.rfq .sub{color:#C6CFD8}
.form-grid>*{min-width:0}
.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px;max-width:860px}
.form-grid .full{grid-column:1/-1}
.field label{display:block;font-size:13px;font-weight:600;color:#C6CFD8;margin-bottom:6px}
.field input,.field select,.field textarea{width:100%;padding:10px 12px;border:1px solid #3A4653;border-radius:2px;background:#242E38;color:#fff;font-size:15px;font-family:var(--body)}
.field textarea{min-height:110px;resize:vertical}

/* footer */
.site-footer{background:var(--ink);color:#9AA5B1;padding:40px 0 24px;font-size:14px}
.site-footer .cols>*{min-width:0}
.site-footer .cols{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:32px;margin-bottom:28px}
.site-footer h4{color:#fff;font-family:var(--head);font-size:16px;margin-bottom:12px}
.site-footer a{color:#9AA5B1}
.site-footer .bottom{border-top:1px solid #3A4653;padding-top:18px;display:flex;justify-content:space-between;font-size:13px}

/* blog */
.post-list{display:grid;gap:20px}
.post-card{border:1px solid var(--line);border-radius:2px;padding:24px;background:#fff}
.post-card h3{font-size:22px}
.post-card .date{font-family:var(--mono);font-size:13px;color:var(--muted)}
.article{max-width:760px}
.article h2{margin-top:32px}
.article ul{margin:0 0 14px 22px}

/* misc */
.breadcrumb{font-size:13px;color:var(--muted);margin:18px 0 0;font-family:var(--mono)}
.notice{background:#FFF6EF;border:1px solid #F0C9A8;border-radius:2px;padding:14px 18px;font-size:14px;margin:20px 0}
table.plain{width:100%;border-collapse:collapse;font-size:14px;margin:16px 0}
table.plain th,table.plain td{border:1px solid var(--line);padding:8px 12px;text-align:left}
table.plain th{background:var(--paper);font-family:var(--head)}
img.resp{max-width:100%;height:auto;border:1px solid var(--line);border-radius:2px}

@media(max-width:900px){
  .nav-toggle[hidden]{display:block;background:none;border:1px solid #4a5560;color:#fff;padding:6px 12px;border-radius:2px;font-size:14px}

  .series-grid{grid-template-columns:1fr 1fr}
  .two-col{grid-template-columns:1fr}
  .steps{grid-template-columns:1fr 1fr}
  .hero-mini{grid-template-columns:1fr}
  .selector .row{grid-template-columns:1fr}
  .form-grid{grid-template-columns:1fr}
  .site-footer .cols{grid-template-columns:1fr 1fr}
  .nav{display:none;position:absolute;top:64px;left:0;right:0;background:var(--ink);flex-direction:column;padding:16px 24px;gap:14px}
  .nav.open{display:flex}
  .nav-toggle{display:block}
  h1{font-size:32px}
}
.series-card img{height:170px;object-fit:cover;width:100%}