:root{
      --bg0:#f7f9fc;
      --bg1:#f0f4fb;
      --card:#ffffff;
      --text:#0f172a;
      --muted:#4b5563;
      --muted2:#6b7280;
      --line:rgba(15,23,42,.12);
      --shadow:0 10px 30px rgba(15,23,42,.08);
      --shadow2:0 6px 18px rgba(15,23,42,.10);
      --brand1:#0b3a66;
      --brand2:#1f7ae0;
      --brand3:#78b7ff;
      --accent:#0a84ff;
      --accent2:#145bd6;
      --radius:18px;
      --radius2:14px;
      --focus:rgba(20,91,214,.22);
      --container:1120px;
      --pad:18px;
    }
    *{box-sizing:border-box}
    html,body{height:100%}
    body{
      margin:0;
      font-family: -apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans CJK SC",Arial,sans-serif;
      color:var(--text);
      background:
        radial-gradient(1200px 420px at 15% -10%, rgba(120,183,255,.28), transparent 55%),
        radial-gradient(900px 360px at 85% 0%, rgba(31,122,224,.22), transparent 50%),
        linear-gradient(180deg, var(--bg1), var(--bg0) 40%, #ffffff 100%);
      overflow-x:hidden;
    }
    a{color:inherit}
    .container{
      width:100%;
      max-width:var(--container);
      margin:0 auto;
      padding:0 var(--pad);
    }

    .topbar{
      position:sticky;
      top:0;
      z-index:50;
      backdrop-filter:saturate(140%) blur(10px);
      background:rgba(247,249,252,.72);
      border-bottom:1px solid rgba(15,23,42,.08);
    }
    .topbar-inner{
      display:flex;
      align-items:center;
      justify-content:space-between;
      gap:12px;
      padding:12px 0;
    }
    .brand{
      display:flex;
      align-items:center;
      gap:10px;
      min-width:140px;
    }
    .logo-badge{
      width:42px;
      height:42px;
      border-radius:14px;
      background:
        linear-gradient(145deg, rgba(255,255,255,.85), rgba(255,255,255,.45)),
        linear-gradient(180deg, rgba(10,132,255,.65), rgba(11,58,102,.65));
      box-shadow: 0 10px 22px rgba(20,91,214,.20);
      border:1px solid rgba(255,255,255,.35);
      display:grid;
      place-items:center;
      position:relative;
      overflow:hidden;
    }
    .logo-badge::after{
      content:"";
      position:absolute;
      inset:-40%;
      background: conic-gradient(from 180deg, rgba(120,183,255,.55), rgba(255,255,255,.0), rgba(20,91,214,.45));
      animation: spinSlow 10s linear infinite;
      opacity:.65;
    }
    .logo-badge span{
      position:relative;
      z-index:1;
      font-weight:900;
      letter-spacing:.02em;
      color:#083258;
      text-shadow: 0 1px 0 rgba(255,255,255,.8);
      font-size:18px;
    }
    @keyframes spinSlow{
      from{transform:rotate(0deg)}
      to{transform:rotate(360deg)}
    }
    .brand-title{
      display:flex;
      flex-direction:column;
      line-height:1.1;
    }
    .brand-title b{
      font-size:14px;
      letter-spacing:.02em;
    }
    .brand-title small{
      color:var(--muted2);
      font-size:12px;
      margin-top:3px;
    }

    .nav{
      display:flex;
      align-items:center;
      gap:10px;
    }
    .nav a{
      text-decoration:none;
      color:rgba(15,23,42,.88);
      font-size:13px;
      padding:9px 10px;
      border-radius:12px;
      border:1px solid transparent;
      transition: transform .15s ease, background .15s ease, border-color .15s ease;
      white-space:nowrap;
    }
    .nav a:hover{
      background:rgba(20,91,214,.08);
      border-color:rgba(20,91,214,.18);
      transform: translateY(-1px);
    }

    .nav-cta{
      display:flex;
      align-items:center;
      gap:10px;
    }
    .btn{
      display:inline-flex;
      align-items:center;
      justify-content:center;
      gap:8px;
      border-radius:14px;
      padding:11px 14px;
      border:1px solid rgba(20,91,214,.25);
      text-decoration:none;
      font-size:13px;
      transition: transform .15s ease, box-shadow .15s ease, background .15s ease, border-color .15s ease;
      white-space:nowrap;
      user-select:none;
    }
    .btn-primary{
      background: linear-gradient(180deg, rgba(20,91,214,.96), rgba(10,132,255,.92));
      color:#fff;
      box-shadow: 0 14px 30px rgba(20,91,214,.22);
      border-color: rgba(255,255,255,.18);
    }
    .btn-primary:hover{
      transform: translateY(-1px);
      box-shadow: 0 18px 38px rgba(20,91,214,.28);
    }
    .btn-ghost{
      background: rgba(255,255,255,.65);
      color:rgba(15,23,42,.92);
      border-color: rgba(15,23,42,.14);
    }
    .btn-ghost:hover{
      transform: translateY(-1px);
      border-color: rgba(20,91,214,.25);
      background: rgba(255,255,255,.86);
    }
    .icon{
      width:18px;
      height:18px;
      display:inline-block;
    }

    .hamburger{
      display:none;
      width:42px;
      height:42px;
      border-radius:14px;
      border:1px solid rgba(15,23,42,.14);
      background:rgba(255,255,255,.65);
      align-items:center;
      justify-content:center;
      cursor:pointer;
      transition: transform .15s ease, background .15s ease, border-color .15s ease;
    }
    .hamburger:hover{
      transform: translateY(-1px);
      border-color: rgba(20,91,214,.25);
      background: rgba(255,255,255,.88);
    }
    .hamburger svg{display:block}

    .mobile-panel{
      display:none;
      border-top:1px solid rgba(15,23,42,.08);
      padding:10px 0 14px;
    }
    .mobile-panel .mnav{
      display:flex;
      flex-direction:column;
      gap:8px;
    }
    .mobile-panel .mnav a{
      text-decoration:none;
      font-size:13px;
      padding:12px 12px;
      border-radius:14px;
      border:1px solid rgba(15,23,42,.10);
      background:rgba(255,255,255,.7);
    }
    .mobile-panel .mnav a:hover{
      border-color: rgba(20,91,214,.25);
      background: rgba(20,91,214,.06);
    }

    .hero{
      padding:34px 0 18px;
      position:relative;
    }
    .hero-grid{
      display:grid;
      grid-template-columns: 1.25fr .75fr;
      gap:18px;
      align-items:start;
    }
    .hero-card{
      background:
        linear-gradient(180deg, rgba(255,255,255,.76), rgba(255,255,255,.56));
      border:1px solid rgba(15,23,42,.10);
      border-radius: var(--radius);
      box-shadow: var(--shadow);
      overflow:hidden;
      position:relative;
    }
    .hero-card::before{
      content:"";
      position:absolute;
      inset:-1px;
      background:
        radial-gradient(540px 260px at 10% 0%, rgba(120,183,255,.35), transparent 60%),
        radial-gradient(420px 220px at 90% 20%, rgba(31,122,224,.22), transparent 55%),
        linear-gradient(180deg, rgba(255,255,255,.2), rgba(255,255,255,.0));
      pointer-events:none;
    }
    .hero-inner{
      position:relative;
      z-index:1;
      padding:22px 22px 18px;
      display:flex;
      flex-direction:column;
      gap:12px;
    }
    .kicker{
      display:flex;
      align-items:center;
      gap:10px;
      flex-wrap:wrap;
    }
    .pill{
      display:inline-flex;
      align-items:center;
      gap:8px;
      padding:8px 10px;
      border-radius:999px;
      border:1px solid rgba(20,91,214,.20);
      background: rgba(20,91,214,.06);
      color: rgba(11,58,102,.95);
      font-size:12px;
      font-weight:700;
    }
    .pill i{
      width:10px;height:10px;border-radius:50%;
      background: linear-gradient(180deg, rgba(20,91,214,1), rgba(10,132,255,1));
      box-shadow: 0 8px 14px rgba(20,91,214,.35);
    }
    .hero h1{
      margin:0;
      font-size:34px;
      line-height:1.18;
      letter-spacing:-.02em;
    }
    .hero p.lead{
      margin:0;
      color:var(--muted);
      font-size:15px;
      line-height:1.7;
      max-width:58ch;
    }
    .hero-actions{
      display:flex;
      gap:12px;
      flex-wrap:wrap;
      padding-top:4px;
    }

    .quick-steps{
      background: rgba(255,255,255,.65);
      border:1px solid rgba(15,23,42,.10);
      border-radius: var(--radius);
      box-shadow: 0 10px 26px rgba(15,23,42,.06);
      overflow:hidden;
    }
    .qs-inner{
      padding:18px 18px 14px;
      display:flex;
      flex-direction:column;
      gap:12px;
      position:relative;
    }
    .qs-title{
      display:flex;
      align-items:center;
      justify-content:space-between;
      gap:10px;
    }
    .qs-title b{
      font-size:14px;
      letter-spacing:.02em;
    }
    .qs-title span{
      color:var(--muted2);
      font-size:12px;
      white-space:nowrap;
    }
    .meter{
      display:flex;
      gap:10px;
      align-items:center;
    }
    .meter .bar{
      height:10px;
      flex:1;
      border-radius:999px;
      background:rgba(15,23,42,.08);
      overflow:hidden;
      border:1px solid rgba(15,23,42,.10);
    }
    .meter .bar > em{
      display:block;
      height:100%;
      width:78%;
      background: linear-gradient(90deg, rgba(20,91,214,.95), rgba(120,183,255,.95));
      border-radius:999px;
    }
    .meter .pct{
      font-size:12px;
      color:rgba(11,58,102,.95);
      font-weight:800;
    }
    .step-list{
      display:flex;
      flex-direction:column;
      gap:10px;
      margin:0;
      padding:0;
      list-style:none;
    }
    .step{
      display:flex;
      align-items:flex-start;
      gap:10px;
      padding:11px 12px;
      border-radius:16px;
      border:1px solid rgba(15,23,42,.10);
      background: rgba(255,255,255,.72);
      transition: transform .15s ease, border-color .15s ease;
    }
    .step:hover{
      transform: translateY(-1px);
      border-color: rgba(20,91,214,.25);
    }
    .step .num{
      width:26px;height:26px;border-radius:12px;
      background: linear-gradient(180deg, rgba(20,91,214,.15), rgba(10,132,255,.08));
      border:1px solid rgba(20,91,214,.22);
      color: rgba(11,58,102,.95);
      display:grid;
      place-items:center;
      font-weight:900;
      font-size:12px;
      flex:0 0 auto;
    }
    .step .txt{
      display:flex;
      flex-direction:column;
      gap:4px;
    }
    .step .txt b{
      font-size:13px;
    }
    .step .txt small{
      color:var(--muted2);
      font-size:12px;
      line-height:1.5;
    }

    .section{
      padding:14px 0;
    }
    .section.compact{
      padding:8px 0;
    }
    .section-title{
      display:flex;
      align-items:flex-end;
      justify-content:space-between;
      gap:12px;
      padding:10px 0 12px;
    }
    .section-title h2{
      margin:0;
      font-size:18px;
      letter-spacing:-.01em;
    }
    .section-title p{
      margin:0;
      color:var(--muted2);
      font-size:13px;
    }

    .grid-3{
      display:grid;
      grid-template-columns: repeat(3, minmax(0,1fr));
      gap:12px;
    }
    .grid-2{
      display:grid;
      grid-template-columns: repeat(2, minmax(0,1fr));
      gap:12px;
    }
    .card{
      background: rgba(255,255,255,.72);
      border:1px solid rgba(15,23,42,.10);
      border-radius: var(--radius);
      box-shadow: 0 10px 22px rgba(15,23,42,.04);
      padding:16px 16px 14px;
      transition: transform .15s ease, box-shadow .15s ease, border-color .15s ease;
      position:relative;
      overflow:hidden;
    }
    .card::after{
      content:"";
      position:absolute;
      inset:-1px;
      background: radial-gradient(420px 220px at 0% 0%, rgba(120,183,255,.22), transparent 60%);
      opacity:0;
      transition: opacity .2s ease;
      pointer-events:none;
    }
    .card:hover{
      transform: translateY(-2px);
      border-color: rgba(20,91,214,.22);
      box-shadow: 0 16px 34px rgba(15,23,42,.08);
    }
    .card:hover::after{opacity:1}
    .card h3{
      margin:0 0 8px;
      font-size:14px;
      letter-spacing:-.01em;
    }
    .card p{
      margin:0;
      color:var(--muted);
      font-size:13px;
      line-height:1.65;
    }
    .tagrow{
      display:flex;
      gap:8px;
      flex-wrap:wrap;
      margin-top:12px;
    }
    .tag{
      font-size:12px;
      color: rgba(11,58,102,.95);
      background: rgba(20,91,214,.07);
      border:1px solid rgba(20,91,214,.18);
      padding:7px 10px;
      border-radius:999px;
      white-space:nowrap;
    }

    .article{
      background: rgba(255,255,255,.62);
      border:1px solid rgba(15,23,42,.10);
      border-radius: var(--radius);
      box-shadow: 0 14px 30px rgba(15,23,42,.05);
      padding:18px;
    }
    .toc{
      display:flex;
      gap:10px;
      flex-wrap:wrap;
      padding:10px 0 6px;
    }
    .toc a{
      text-decoration:none;
      font-size:13px;
      color: rgba(11,58,102,.95);
      border:1px solid rgba(20,91,214,.18);
      background: rgba(20,91,214,.06);
      padding:10px 12px;
      border-radius:14px;
      transition: transform .15s ease, background .15s ease, border-color .15s ease;
    }
    .toc a:hover{
      transform: translateY(-1px);
      border-color: rgba(20,91,214,.28);
      background: rgba(20,91,214,.10);
    }

    .steps{
      display:grid;
      grid-template-columns: 1fr 1fr;
      gap:12px;
      align-items:start;
      margin-top:10px;
    }
    .step-card{
      border-radius: var(--radius);
      border:1px solid rgba(15,23,42,.10);
      background: rgba(255,255,255,.72);
      padding:14px 14px 12px;
    }
    .step-card h3{
      margin:0 0 8px;
      font-size:14px;
    }
    .step-card ul{
      margin:0;
      padding:0;
      list-style:none;
      display:flex;
      flex-direction:column;
      gap:10px;
    }
    .li{
      display:flex;
      gap:10px;
      align-items:flex-start;
    }
    .dot{
      width:10px;height:10px;border-radius:50%;
      margin-top:6px;
      background: linear-gradient(180deg, rgba(20,91,214,1), rgba(10,132,255,1));
      box-shadow: 0 10px 18px rgba(20,91,214,.26);
      flex:0 0 auto;
    }
    .li p{
      margin:0;
      color:var(--muted);
      font-size:13px;
      line-height:1.6;
    }

    .image-strip{
      display:flex;
      gap:10px;
      overflow:auto;
      padding:4px 0 2px;
      scroll-snap-type:x mandatory;
      -webkit-overflow-scrolling:touch;
    }
    .image-strip::-webkit-scrollbar{height:8px}
    .image-strip::-webkit-scrollbar-thumb{background:rgba(15,23,42,.16);border-radius:999px}
    .img-card{
      flex:0 0 auto;
      width:210px;
      scroll-snap-align:start;
      border-radius: var(--radius);
      border:1px solid rgba(15,23,42,.10);
      background: rgba(255,255,255,.72);
      overflow:hidden;
      box-shadow: 0 10px 22px rgba(15,23,42,.04);
    }
    .img-wrap{
      padding:10px;
    }
    .img-wrap .frame{
      width:100%;
      aspect-ratio: 4 / 3;
      border-radius:14px;
      background: linear-gradient(180deg, rgba(20,91,214,.08), rgba(15,23,42,.02));
      border:1px solid rgba(15,23,42,.10);
      display:flex;
      align-items:center;
      justify-content:center;
      overflow:hidden;
    }
    .img-wrap img{
      width:100%;
      height:100%;
      object-fit:cover;
      display:block;
      transform: scale(1.01);
    }
    .img-card .cap{
      padding:0 12px 12px;
      color:var(--muted2);
      font-size:12px;
      line-height:1.5;
    }

    .divider{
      height:1px;
      background: rgba(15,23,42,.10);
      margin:14px 0 6px;
    }

    details.faq{
      background: rgba(255,255,255,.72);
      border:1px solid rgba(15,23,42,.10);
      border-radius: var(--radius);
      padding:12px 14px;
      box-shadow: 0 10px 22px rgba(15,23,42,.04);
      transition: border-color .15s ease, transform .15s ease;
    }
    details.faq[open]{
      border-color: rgba(20,91,214,.25);
    }
    details.faq:hover{
      transform: translateY(-1px);
      border-color: rgba(20,91,214,.22);
    }
    summary{
      cursor:pointer;
      list-style:none;
      display:flex;
      align-items:flex-start;
      justify-content:space-between;
      gap:12px;
      user-select:none;
    }
    summary::-webkit-details-marker{display:none}
    .q{
      display:flex;
      flex-direction:column;
      gap:6px;
    }
    .q b{
      font-size:14px;
      letter-spacing:-.01em;
    }
    .q small{
      color:var(--muted2);
      font-size:12px;
      line-height:1.5;
    }
    .chev{
      width:30px;height:30px;
      border-radius:12px;
      border:1px solid rgba(15,23,42,.10);
      background: rgba(255,255,255,.70);
      display:grid;
      place-items:center;
      flex:0 0 auto;
      transition: transform .2s ease;
      margin-top:1px;
    }
    details[open] .chev{
      transform: rotate(180deg);
      border-color: rgba(20,91,214,.25);
    }
    .ans{
      margin-top:10px;
      color:var(--muted);
      font-size:13px;
      line-height:1.75;
    }
    .ans a{
      color: rgba(20,91,214,.98);
      text-decoration: none;
      border-bottom:1px solid rgba(20,91,214,.28);
    }
    .ans a:hover{
      border-bottom-color: rgba(20,91,214,.55);
    }

    footer{
      margin-top:12px;
      background: linear-gradient(180deg, rgba(20,91,214,.08), rgba(11,58,102,.06));
      border-top:1px solid rgba(15,23,42,.10);
      color: rgba(15,23,42,.95);
    }
    .footer-inner{
      padding:18px 0 16px;
      display:grid;
      grid-template-columns: 1.1fr .9fr;
      gap:14px;
      align-items:start;
    }
    .foot-card{
      background: rgba(255,255,255,.78);
      border:1px solid rgba(15,23,42,.10);
      border-radius: var(--radius);
      padding:14px 14px 12px;
      box-shadow: 0 10px 22px rgba(15,23,42,.04);
    }
    .foot-card h3{
      margin:0 0 10px;
      font-size:14px;
    }
    .foot-grid{
      display:grid;
      grid-template-columns: 1fr;
      gap:10px;
    }
    .kv{
      display:flex;
      gap:10px;
      align-items:flex-start;
    }
    .kv i{
      width:10px;height:10px;border-radius:50%;
      background: linear-gradient(180deg, rgba(20,91,214,1), rgba(10,132,255,1));
      box-shadow: 0 10px 18px rgba(20,91,214,.26);
      margin-top:6px;
      flex:0 0 auto;
    }
    .kv p{
      margin:0;
      color:var(--muted);
      font-size:13px;
      line-height:1.65;
    }
    .foot-links{
      display:flex;
      flex-wrap:wrap;
      gap:10px;
    }
    .foot-links a{
      font-size:13px;
      text-decoration:none;
      padding:10px 12px;
      border-radius:14px;
      border:1px solid rgba(15,23,42,.10);
      background: rgba(255,255,255,.72);
      transition: transform .15s ease, border-color .15s ease, background .15s ease;
      white-space:nowrap;
    }
    .foot-links a:hover{
      transform: translateY(-1px);
      border-color: rgba(20,91,214,.22);
      background: rgba(20,91,214,.06);
    }
    .copyright{
      padding:10px 0 18px;
      color: rgba(75,85,99,.95);
      font-size:12px;
      text-align:center;
    }

    .float-top{
      position:fixed;
      right:14px;
      bottom:14px;
      z-index:60;
      opacity:0;
      transform: translateY(10px);
      pointer-events:none;
      transition: opacity .2s ease, transform .2s ease;
    }
    .float-top.show{
      opacity:1;
      transform: translateY(0);
      pointer-events:auto;
    }

    .toTopBtn{
      width:46px;height:46px;border-radius:18px;
      border:1px solid rgba(15,23,42,.12);
      background: rgba(255,255,255,.82);
      box-shadow: 0 18px 40px rgba(15,23,42,.16);
      cursor:pointer;
      display:grid;
      place-items:center;
      transition: transform .15s ease, border-color .15s ease, background .15s ease;
    }
    .toTopBtn:hover{
      transform: translateY(-2px);
      border-color: rgba(20,91,214,.25);
      background: rgba(255,255,255,.95);
    }

    .fade-in{
      opacity:0;
      transform: translateY(10px);
      transition: opacity .5s ease, transform .5s ease;
    }
    .fade-in.show{
      opacity:1;
      transform: translateY(0);
    }

    @media (max-width: 980px){
      :root{--container: 980px}
      .hero-grid{grid-template-columns: 1fr}
      .steps{grid-template-columns: 1fr}
      .grid-3{grid-template-columns: 1fr}
      .grid-2{grid-template-columns: 1fr}
      .footer-inner{grid-template-columns: 1fr}
      .nav{display:none}
      .nav-cta{display:none}
      .hamburger{display:flex}
      .mobile-panel{display:block}
      .hero h1{font-size:28px}
      .hero-inner{padding:18px}
      .qs-inner{padding:16px}
    }
    @media (prefers-reduced-motion: reduce){
      .fade-in{transition:none}
      .logo-badge::after{animation:none}
      .card, .btn, .step, .toc a, details.faq{transition:none}
      .float-top, .float-top.show{transition:none}
    }