:root{
    --navy:#00296D;
    --blue:#0055C9;
    --navy-08:rgba(0,41,109,.08);
    --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%;scroll-behavior:smooth;}
  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:24ch;margin-bottom:20px;
  }
  .hero .lead{max-width:64ch;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:78px 0;}
  section.alt{background:var(--bg-soft);border-top:1px solid var(--line);border-bottom:1px solid var(--line);}
  .sec-head{max-width:800px;margin-bottom:38px;}
  .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,2.6vw,32px);font-weight:800;color:var(--navy);}
  .sec-head p{margin:14px 0 0;color:var(--ink-soft);max-width:72ch;}

  /* ---------------- Contents index ---------------- */
  .index{
    display:grid;grid-template-columns:repeat(3,1fr);gap:1px;
    background:var(--line);border:1px solid var(--line);
    border-radius:var(--radius);overflow:hidden;
  }
  .index a{
    display:flex;gap:14px;align-items:flex-start;
    background:#fff;padding:22px 24px;color:var(--navy);
    transition:background .16s ease;
  }
  .index a:hover{background:var(--bg-soft);text-decoration:none;}
  .index .n{
    flex:0 0 auto;font-size:12px;font-weight:800;letter-spacing:.1em;
    color:var(--blue);margin-top:3px;
  }
  .index .t{font-weight:650;line-height:1.35;}
  .index .c{display:block;font-size:13px;color:var(--ink-soft);font-weight:500;margin-top:3px;}

  /* ---------------- FAQ ---------------- */
  .faq{max-width:920px;}
  .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 0 12px;}
  .faq .a p:last-child{margin-bottom:0;}
  .faq .a strong{color:var(--navy);font-weight:700;}

  /* ---------------- 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:32ch;}
  .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);}
  .btn svg{width:17px;height:17px;stroke:currentColor;fill:none;stroke-width:2.1;stroke-linecap:round;stroke-linejoin:round;}
  .cta-tag{
    font-size:13px;font-weight:700;letter-spacing:.15em;text-transform:uppercase;
    color:#9FC4FF;margin-bottom:14px;
  }
  .cta-action{display:flex;flex-direction:column;align-items:flex-start;}
  .cta .assure{
    list-style:none;margin:20px 0 0;padding:0;
    display:flex;flex-direction:column;gap:9px;
  }
  .cta .assure li{display:flex;align-items:center;gap:10px;font-size:16px;color:#C9DCFA;}
  .cta .assure li::before{
    content:"";flex:0 0 auto;width:11px;height:6px;
    border-left:2px solid #4C8BFF;border-bottom:2px solid #4C8BFF;
    transform:rotate(-45deg);margin-top:-4px;
  }
  .cta .next{
    list-style:none;display:grid;grid-template-columns:repeat(3,1fr);
    gap:1px;margin:46px 0 0;padding:0;
    background:rgba(255,255,255,.16);
    border-top:1px solid rgba(255,255,255,.16);
    border-radius:10px;overflow:hidden;
  }
  .cta .next li{
    display:flex;gap:14px;align-items:flex-start;
    padding:22px 24px;background:rgba(0,20,56,.55);
  }
  .cta .next .n{
    flex:0 0 auto;font-size:12px;font-weight:800;letter-spacing:.1em;
    color:#4C8BFF;margin-top:4px;
  }
  .cta .next .t{font-size:16px;color:#C9DCFA;line-height:1.5;}

  /* ---------------- Responsive ---------------- */
  @media (max-width:1000px){
    .hero-metrics{grid-template-columns:repeat(2,1fr);}
    .index{grid-template-columns:repeat(2,1fr);}
    .cta-inner{grid-template-columns:1fr;}
    .cta{padding:58px 0;}
    .cta .next{grid-template-columns:1fr;}
  }
  @media (max-width:680px){
    section{padding:56px 0;}
    .wrap{padding:0 20px;}
    .hero{padding-top:62px;}
    .hero-metrics{margin:0 -20px;grid-template-columns:1fr;}
    .index{grid-template-columns:1fr;}
    .faq summary{padding:18px 50px 18px 18px;}
    .faq .a{padding:0 18px 20px;}
    .cta .next li{padding:18px 20px;}
  }