/* ===== BLD3000 / PU3000G page (dark tech page, ) ===== */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
body{font-family:Inter,system-ui,sans-serif;color:#e0e0e0;background:#0d1117;line-height:1.6}
img{max-width:100%;display:block}

/* Hero */
.hero{background:#0d1117;padding:32px 0 0;text-align:left}
.hero-inner{max-width:960px;margin:0 auto;padding:0 20px}
.hero h1{font-size:1.5rem;font-weight:600;color:#fff;line-height:1.3;margin-bottom:6px}
.hero .sub{font-size:13px;font-weight:600;color:rgba(255,255,255,.75);margin-bottom:16px}

/* Section */
.sec{max-width:960px;margin:0 auto;padding:60px 20px 0}
.sec-label{font-size:10px;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:rgba(255,255,255,.55);margin-bottom:6px;text-align:left}
.sec-h2{font-size:1.5rem;font-weight:800;color:#fff;margin-bottom:8px}
.sec-lead{font-size:13px;color:rgba(255,255,255,.85);line-height:1.7}
.sec-lead a{color:#fff;text-decoration:underline;text-underline-offset:3px}
.sec-note{font-size:12px;color:rgba(255,255,255,.55);line-height:1.6;margin-top:8px}
.sec strong,.sec-lead strong,.feat-list strong{color:#fff}
.sec-h3{font-size:1rem;font-weight:600;color:#fff;margin:20px 0 8px}
.sec-h3.sm{font-size:.95rem}
.sec-h3.mt0{margin-top:0}
.sec-h3.mt16{margin-top:16px}
.sec-h3.mt24{margin-top:24px}

/* Key Specs （） */
.ks-row{display:flex;gap:20px;align-items:stretch}
.ks-img{flex:0 0 380px;position:relative;border-radius:4px;overflow:hidden;border:1px solid rgba(255,255,255,.12);background:#0d1117}
.ks-img img{width:100%;display:block;object-fit:contain;height:auto}
.ks-main{flex:1;min-width:0}
.spec-list{display:grid;grid-template-columns:1fr 1fr;gap:6px 20px;margin-top:12px}
.ks-item{display:flex;gap:6px;font-size:13px;line-height:1.7}
.ks-k{color:rgba(255,255,255,.75);white-space:nowrap}
.ks-v{color:#fff;font-weight:600}

/* Spec Cards（spec-card ， spec-grid ） */
.spec-grid{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin-top:16px}

/* Feature List */
.feat-list{list-style:none;padding:0;margin:12px 0}
.feat-list li{font-size:13px;color:rgba(255,255,255,.85);padding:4px 0;line-height:1.6;padding-left:16px;position:relative}
.feat-list li::before{content:"—";position:absolute;left:0;color:rgba(255,255,255,.35)}
.ul-disc{list-style:disc}

/* CTA */
.cta-row{display:flex;flex-wrap:wrap;gap:10px;margin-top:16px}
.cta-btn{display:inline-block;color:#fff;font-size:13px;font-weight:600;text-decoration:none;border:1px solid rgba(255,255,255,.25);padding:8px 24px;border-radius:4px}
.cta-btn:hover{background:rgba(255,255,255,.08)}
.video-wrap{position:relative;padding-bottom:56.25%;height:0;overflow:hidden;border-radius:4px;margin:16px 0;border:1px solid rgba(255,255,255,.1)}
.video-wrap iframe{position:absolute;top:0;left:0;width:100%;height:100%;border:none}
.video-cap{font-size:12px;color:rgba(255,255,255,.55);text-align:center;margin-top:4px}
.sec-img-cover{width:100%;height:auto;display:block;border-radius:4px;border:1px solid rgba(255,255,255,.1);object-fit:cover;max-height:300px}

/* Spec Table */
.spec-table{width:100%;border-collapse:collapse;margin-top:16px;font-size:13px}
.spec-table th,.spec-table td{border:1px solid rgba(255,255,255,.15);padding:10px 14px;text-align:left}
.spec-table th{background:rgba(255,255,255,.05);color:#fff;font-weight:600;font-size:12px}
.spec-table td{color:rgba(255,255,255,.85)}
.spec-table td:first-child{color:rgba(255,255,255,.65);font-weight:500;white-space:nowrap}

/* Step Cards */
.step-grid{display:grid;grid-template-columns:1fr;gap:12px;margin-top:16px}
.step-card{border:1px solid rgba(255,255,255,.15);border-radius:4px;padding:20px}
.step-num{font-size:1.15rem;font-weight:700;color:rgba(255,255,255,.7);margin-bottom:6px}
.step-card strong{display:block;font-size:13px;color:#fff;margin-bottom:4px}
.step-card p{font-size:13px;color:rgba(255,255,255,.85);line-height:1.6}
.oem-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.oem-step{border:1px solid rgba(255,255,255,.15);border-radius:4px;padding:16px}
.oem-step .step-num{font-size:1.15rem;font-weight:700;color:rgba(255,255,255,.7);margin-bottom:6px}
.oem-step strong{display:block;font-size:13px;color:#fff;margin-bottom:4px}
.oem-step p{font-size:12px;color:rgba(255,255,255,.7)}

/* Safety */
.safety-warn{background:rgba(255,200,50,.06);border:1px solid rgba(255,200,50,.2);border-radius:4px;padding:16px;margin-bottom:12px}
.safety-prohibit{background:rgba(255,80,50,.06);border:1px solid rgba(255,80,50,.2);border-radius:4px;padding:16px;margin-bottom:12px}
.safety-warn h3{color:#ffc832;font-size:14px;margin-bottom:8px}
.safety-prohibit h3{color:#ff5032;font-size:14px;margin-bottom:8px}
.safety-warn li,.safety-prohibit li{font-size:13px;color:rgba(255,255,255,.85);padding:3px 0;line-height:1.6;margin-left:16px}
.oem-info{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.oem-info .info-card{border:1px solid rgba(255,255,255,.15);border-radius:4px;padding:14px}
.oem-info .info-val{font-size:.95rem;font-weight:600;color:#fff}
.oem-info .info-lbl{font-size:10px;color:rgba(255,255,255,.55);text-transform:uppercase;letter-spacing:.06em;margin-top:2px}
.tip-box{border-left:3px solid rgba(255,255,255,.2);padding:12px 16px;margin:12px 0;font-size:13px;color:rgba(255,255,255,.65);font-style:italic}

/* FAQ（+ ） */
.faq-item{border-bottom:1px solid rgba(255,255,255,.1)}
.faq-q{position:relative;font-size:14px;font-weight:600;color:#fff;padding:14px 28px 14px 0;cursor:pointer}
.faq-q::after{content:"+";position:absolute;right:2px;top:12px;font-size:1.2rem;font-weight:400;color:rgba(255,255,255,.5)}
.faq-item.open .faq-q::after{content:"\2212"}
.faq-a{font-size:13px;color:rgba(255,255,255,.85);line-height:1.7;padding:0 0 16px;display:none}
.faq-a a{color:#fff;text-decoration:underline;text-underline-offset:3px}
.faq-item.open .faq-a{display:block}

/* Related（related-grid ，） */

/* Flow strip */
.flow-strip{display:grid;grid-template-columns:1fr 1fr 1fr 1fr;gap:16px;margin-top:16px}
.flow-item strong{display:block;color:#fff;font-size:13px}
.flow-item p{font-size:12px;color:rgba(255,255,255,.65);line-height:1.6;margin-top:4px}

/* */
.mt2{margin-top:2px}
.mt8{margin-top:8px}
.mt12{margin-top:12px}
.mt16{margin-top:16px}
.mt48{margin-top:48px}
.mb8{margin-bottom:8px}
.mb12{margin-bottom:12px}
.pb64{padding-bottom:64px}

/* PC */
@media(min-width:768px){
  .hero{padding:64px 0 0}
  .sec{padding-top:100px}
  .sec-h2{font-size:1.8rem}
  .sec-lead{font-size:14px}
  .spec-grid{grid-template-columns:repeat(3,1fr)}
  .step-grid{grid-template-columns:repeat(2,1fr)}
  .oem-info{grid-template-columns:repeat(4,1fr)}
  .hero h1{font-size:2rem}
}

/* Mobile */
@media(max-width:767px){
  .ks-row{flex-direction:column!important}
  .ks-img{flex:0 0 auto!important;height:220px!important;width:100%!important}
  .sec{padding-top:60px!important;padding-left:16px!important;padding-right:16px!important}
  .ks-row .spec-list{grid-template-columns:1fr!important}
  .flow-strip{grid-template-columns:1fr!important}
  .spec-grid{grid-template-columns:repeat(2,1fr)}
  .spec-table{font-size:11px}
  .spec-table th,.spec-table td{padding:8px 10px}
}