:root{
    --navy:#00296D;
    --blue:#0055C9;
    --navy-08:rgba(0,41,109,.08);
    --navy-04:rgba(0,41,109,.04);
    --blue-08:rgba(0,85,201,.08);
    --ink:#16233A;
    --ink-soft:#4A5A72;
    --line:#E2E8F2;
    --bg:#FFFFFF;
    --bg-soft:#F6F9FE;
    --radius:14px;
    --maxw:1180px;
    --font:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,"Noto Sans",sans-serif;
  }

  *,*::before,*::after{box-sizing:border-box;}
  html{-webkit-text-size-adjust:100%;}
  body{
    margin:0;
    background:var(--bg);
    color:var(--ink);
    font-family:var(--font);
    font-size:16px;
    line-height:1.75;
    -webkit-font-smoothing:antialiased;
  }
  /* 正文统一 16px */
  p,li,dd,dt,td,th,summary{font-size:16px;}
  h1,h2,h3,h4{margin:0;line-height:1.25;letter-spacing:-.01em;}
  a{color:var(--blue);text-decoration:none;}
  a:hover{text-decoration:underline;}
  .wrap{max-width:var(--maxw);margin:0 auto;padding:0 28px;}
  .num{font-variant-numeric:tabular-nums;}

  /* ---------------- Hero ---------------- */
  .hero{
    position:relative;
    background:
      radial-gradient(120% 140% at 88% -10%, rgba(0,85,201,.55) 0%, rgba(0,85,201,0) 55%),
      linear-gradient(160deg,#001B4A 0%,var(--navy) 45%,#00327F 100%);
    color:#fff;
    padding:88px 0 0;
    overflow:hidden;
  }
  .hero::after{
    content:"";
    position:absolute;inset:0;
    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:64px 64px;
    mask-image:linear-gradient(180deg,rgba(0,0,0,.85),rgba(0,0,0,0) 72%);
    pointer-events:none;
  }
  .hero .wrap{position:relative;z-index:1;}
  .eyebrow{
    display:inline-flex;align-items:center;gap:10px;
    font-size:13px;font-weight:700;letter-spacing:.16em;text-transform:uppercase;
    color:#9FC4FF;margin-bottom:22px;
  }
  .eyebrow::before{content:"";width:34px;height:2px;background:#4C8BFF;display:block;}
  .hero h1{
    font-size:clamp(30px,4.2vw,52px);
    font-weight:800;
    max-width:20ch;
    margin-bottom:20px;
  }
  .hero .lead{
    max-width:62ch;
    color:#C9DCFA;
    font-size:17px;
    margin:0 0 46px;
  }
  .hero-metrics{
    display:grid;
    grid-template-columns:repeat(4,1fr);
    gap:1px;
    background:rgba(255,255,255,.14);
    border-top:1px solid rgba(255,255,255,.14);
    margin:0 -28px;
  }
  .metric{
    background:linear-gradient(180deg,rgba(0,27,74,.65),rgba(0,41,109,.65));
    padding:26px 24px 30px;
  }
  .metric .v{
    font-size:30px;font-weight:800;letter-spacing:-.02em;
    display:flex;align-items:baseline;gap:6px;
  }
  .metric .v span{font-size:15px;font-weight:600;color:#9FC4FF;letter-spacing:0;}
  .metric .k{font-size:13px;color:#A9C3E6;margin-top:6px;letter-spacing:.02em;}

  /* ---------------- Section shell ---------------- */
  section{padding:82px 0;}
  section.alt{background:var(--bg-soft);border-top:1px solid var(--line);border-bottom:1px solid var(--line);}
  .sec-head{max-width:760px;margin-bottom:46px;}
  .sec-tag{
    font-size:13px;font-weight:700;letter-spacing:.15em;text-transform:uppercase;
    color:var(--blue);margin-bottom:14px;
  }
  .sec-head h2{font-size:clamp(24px,2.7vw,34px);font-weight:800;color:var(--navy);}
  .sec-head h2 em{font-style:normal;color:var(--blue);}
  .sec-head p{margin:16px 0 0;color:var(--ink-soft);max-width:68ch;}

  /* ---------------- Spec table ---------------- */
  .spec{
    border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;
    background:#fff;
  }
  .spec-row{
    display:grid;grid-template-columns:1fr 1.15fr 1.15fr;
    border-top:1px solid var(--line);
  }
  .spec-row:first-child{border-top:0;}
  .spec-row > div{padding:18px 24px;}
  .spec-row .c1{color:var(--ink-soft);background:#FBFCFE;}
  .spec-row .c2,.spec-row .c3{font-weight:650;color:var(--navy);}
  .spec-row.head{background:var(--navy);}
  .spec-row.head > div{
    color:#fff;font-size:13px;font-weight:700;letter-spacing:.11em;text-transform:uppercase;
    background:transparent;
  }
  .spec-row .unit{font-weight:600;color:var(--ink-soft);font-size:14px;}

  /* ---------------- QC flow ---------------- */
  .flow{
    display:grid;grid-template-columns:repeat(4,1fr);gap:0;
    counter-reset:step;
  }
  .step{
    position:relative;
    padding:0 26px 0 0;
    counter-increment:step;
  }
  .step::before{
    content:counter(step,decimal-leading-zero);
    display:flex;align-items:center;justify-content:center;
    width:46px;height:46px;border-radius:50%;
    background:var(--navy);color:#fff;
    font-size:12px;font-weight:800;letter-spacing:.06em;
    margin-bottom:20px;
    position:relative;z-index:2;
  }
  .step::after{
    content:"";position:absolute;
    top:23px;left:46px;right:0;height:2px;
    background:linear-gradient(90deg,var(--blue),rgba(0,85,201,.12));
    z-index:1;
  }
  .step:last-child::after{display:none;}
  .step h3{font-size:18px;color:var(--navy);margin-bottom:6px;}
  .step .stage{
    font-size:13px;font-weight:700;letter-spacing:.1em;text-transform:uppercase;
    color:var(--blue);margin-bottom:10px;
  }
  .step p{margin:0;color:var(--ink-soft);font-size:16px;}

  /* ---------------- Card grids ---------------- */
  .grid{display:grid;gap:20px;}
  .grid.two{grid-template-columns:repeat(2,1fr);}
  .grid.three{grid-template-columns:repeat(3,1fr);}
  .grid.four{grid-template-columns:repeat(4,1fr);}

  .card{
    background:#fff;border:1px solid var(--line);border-radius:var(--radius);
    padding:26px 26px 28px;
    position:relative;
    display:flex;flex-direction:column;
    transition:border-color .18s ease,box-shadow .18s ease,transform .18s ease;
  }
  .card:hover{
    border-color:rgba(0,85,201,.4);
    box-shadow:0 14px 34px -18px rgba(0,41,109,.34);
    transform:translateY(-2px);
  }
  .card .shot{
    flex:0 0 auto;
    margin:-26px -26px 20px;overflow:hidden;
    border-radius:13px 13px 0 0;background:#EDF1F8;
  }
  .card .shot img{
    display:block;width:100%;height:auto;
    aspect-ratio:1 / 1;object-fit:cover;
    transition:transform .35s ease;
  }
  .card:hover .shot img{transform:scale(1.035);}
  .card .ico{
    flex:0 0 auto;
    width:40px;height:40px;border-radius:10px;
    background:var(--blue-08);color:var(--blue);
    display:flex;align-items:center;justify-content:center;
    margin-bottom:16px;
  }
  .card .ico svg{width:21px;height:21px;stroke:currentColor;fill:none;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round;}
  .card h3{font-size:17px;color:var(--navy);margin-bottom:8px;}
  .card p{margin:0 0 14px;color:var(--ink-soft);font-size:16px;}
  .card .chip{
    display:inline-block;margin-top:auto;align-self:flex-start;
    font-size:13px;font-weight:700;letter-spacing:.04em;
    color:var(--blue);background:var(--blue-08);
    padding:4px 10px;border-radius:6px;
  }

  /* line card (equipment) */
  .line-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;}
  .line-card header{
    background:linear-gradient(180deg,var(--navy),#003583);
    color:#fff;padding:22px 26px;
  }
  .line-card header h3{font-size:19px;font-weight:750;}
  .line-card header .sub{font-size:14px;color:#A9C3E6;margin-top:4px;letter-spacing:.02em;}
  .line-card ul{list-style:none;margin:0;padding:10px 26px 22px;}
  .line-card li{
    display:flex;justify-content:space-between;gap:18px;
    padding:13px 0;border-bottom:1px dashed var(--line);
    font-size:16px;
  }
  .line-card li:last-child{border-bottom:0;}
  .line-card li .k{color:var(--ink-soft);}
  .line-card li .v{color:var(--navy);font-weight:650;text-align:right;}
  .line-card .vendor{
    display:inline-block;font-size:13px;font-weight:700;color:var(--blue);
    background:var(--blue-08);border-radius:5px;padding:2px 8px;margin-left:8px;
  }

  /* ---------------- Capacity band ---------------- */
  .capacity{
    background:linear-gradient(150deg,#001B4A,var(--navy) 60%,#00327F);
    color:#fff;border-radius:var(--radius);
    padding:48px 44px;
  }
  .capacity-grid{
    display:grid;grid-template-columns:repeat(4,1fr);gap:1px;
    background:rgba(255,255,255,.16);
    margin-top:34px;border-radius:10px;overflow:hidden;
  }
  .capacity-grid > div{background:rgba(0,27,74,.55);padding:24px 22px;}
  .capacity-grid .v{font-size:26px;font-weight:800;letter-spacing:-.02em;}
  .capacity-grid .k{font-size:13px;color:#A9C3E6;margin-top:4px;}
  .capacity h3{font-size:22px;font-weight:750;}
  .capacity p{color:#C9DCFA;margin:12px 0 0;max-width:70ch;}

  /* ---------------- Certs ---------------- */
  .cert{
    display:grid;grid-template-columns:repeat(4,1fr);gap:16px;
  }
  .cert-item{
    background:#fff;border:1px solid var(--line);border-left:3px solid var(--blue);
    border-radius:10px;padding:20px 22px;
    display:flex;flex-direction:column;
  }
  .cert-item .t{font-size:17px;font-weight:800;color:var(--navy);letter-spacing:-.01em;}
  .cert-item .d{font-size:16px;color:var(--ink-soft);margin-top:6px;line-height:1.55;}
  .cert-item .n{font-size:13px;color:var(--blue);font-weight:700;margin-top:auto;padding-top:10px;letter-spacing:.02em;}

  /* ---------------- FAQ ---------------- */
  .faq{max-width:900px;}
  .faq details{
    border:1px solid var(--line);border-radius:12px;background:#fff;
    margin-bottom:14px;overflow:hidden;
    transition:border-color .18s ease,box-shadow .18s ease;
  }
  .faq details[open]{
    border-color:rgba(0,85,201,.42);
    box-shadow:0 12px 30px -20px rgba(0,41,109,.38);
  }
  .faq summary{
    cursor:pointer;list-style:none;
    padding:20px 56px 20px 24px;position:relative;
    font-weight:650;color:var(--navy);
    display:block;
  }
  .faq summary::-webkit-details-marker{display:none;}
  .faq summary::after{
    content:"";position:absolute;right:24px;top:50%;
    width:10px;height:10px;margin-top:-6px;
    border-right:2px solid var(--blue);border-bottom:2px solid var(--blue);
    transform:rotate(45deg);transition:transform .2s ease;
  }
  .faq details[open] summary::after{transform:rotate(-135deg);margin-top:-2px;}
  .faq .a{padding:0 24px 22px;color:var(--ink-soft);}
  .faq .a p{margin:0;}

  /* ---------------- CTA ---------------- */
  .cta{
    background:
      radial-gradient(110% 150% at 15% 0%, rgba(0,85,201,.5) 0%, rgba(0,85,201,0) 58%),
      linear-gradient(150deg,#001B4A,var(--navy) 55%,#00327F);
    color:#fff;
    padding:74px 0;
  }
  .cta-inner{
    display:grid;grid-template-columns:1.35fr auto;gap:40px;align-items:center;
  }
  .cta h2{font-size:clamp(24px,2.8vw,34px);font-weight:800;max-width:24ch;}
  .cta p{color:#C9DCFA;margin:16px 0 0;max-width:58ch;}
  .btn{
    display:inline-flex;align-items:center;justify-content:center;gap:10px;
    background:var(--blue);color:#fff;
    font-size:16px;font-weight:700;
    padding:16px 30px;border-radius:10px;
    box-shadow:0 16px 38px -18px rgba(0,85,201,.95);
    white-space:nowrap;
    transition:background .18s ease,transform .18s ease,box-shadow .18s ease;
  }
  .btn:hover{background:#0066EF;text-decoration:none;transform:translateY(-2px);box-shadow:0 20px 44px -18px rgba(0,85,201,1);}
  .btn svg{width:17px;height:17px;stroke:currentColor;fill:none;stroke-width:2.1;stroke-linecap:round;stroke-linejoin:round;}
  .cta .note{font-size:13.5px;color:#8FB3E0;margin-top:14px;letter-spacing:.02em;}

  /* ---------------- Responsive ---------------- */
  @media (max-width:1000px){
    .hero-metrics{grid-template-columns:repeat(2,1fr);}
    .flow{grid-template-columns:repeat(2,1fr);gap:34px 0;}
    .step:nth-child(2)::after{display:none;}
    .grid.three,.grid.four,.cert{grid-template-columns:repeat(2,1fr);}
    .spec-row{grid-template-columns:1fr 1fr 1fr;}
    .capacity-grid{grid-template-columns:repeat(2,1fr);}
    .cta-inner{grid-template-columns:1fr;}
    .cta{padding:58px 0;}
  }
  @media (max-width:680px){
    section{padding:58px 0;}
    .wrap{padding:0 20px;}
    .hero{padding-top:62px;}
    .hero-metrics{margin:0 -20px;grid-template-columns:1fr;}
    .grid.two,.grid.three,.grid.four,.cert,.capacity-grid{grid-template-columns:1fr;}
    .flow{grid-template-columns:1fr;gap:28px;}
    .step::after{display:none;}
    .spec-row{grid-template-columns:1fr;}
    .spec-row .c1{background:#fff;padding-bottom:0;font-size:14px;letter-spacing:.04em;text-transform:uppercase;font-weight:700;}
    .spec-row .c2{padding-top:4px;}
    .spec-row.head{display:none;}
    .capacity{padding:32px 24px;}
    .line-card ul{padding:8px 20px 18px;}
  }