:root{
      --bg0:#f6f7fb;
      --bg1:#ffffff;
      --text:#111827;
      --muted:#5b6476;
      --subtle:#7b869a;
      --line:rgba(17,24,39,.10);
      --line2:rgba(17,24,39,.14);
      --card:#ffffff;
      --shadow:0 10px 30px rgba(17,24,39,.08);
      --shadow2:0 10px 26px rgba(17,24,39,.12);
      --brand:#8b93a8;
      --accent:#1f4bff;
      --accent2:#0f2a66;
      --chip:rgba(17,24,39,.05);
      --radius:16px;
      --radius2:22px;
      --focus:rgba(31,75,255,.25);
    }
    *{box-sizing:border-box}
    html,body{height:100%}
    body{
      margin:0;
      font-family: ui-sans-serif, system-ui, -apple-system, "PingFang SC","Hiragino Sans GB","Microsoft YaHei", "Noto Sans SC", Arial, sans-serif;
      color:var(--text);
      background:
        radial-gradient(900px 400px at 15% 0%, rgba(31,75,255,.10), transparent 60%),
        radial-gradient(700px 360px at 90% 20%, rgba(17,24,39,.06), transparent 60%),
        linear-gradient(180deg, var(--bg0), #fff 520px, #fff);
      overflow-x:hidden;
    }
    a{color:inherit; text-decoration:none}
    .container{
      max-width:1080px;
      margin:0 auto;
      padding:0 18px;
    }

    header{
      position:sticky;
      top:0;
      z-index:50;
      background:rgba(246,247,251,.72);
      backdrop-filter: blur(10px);
      border-bottom:1px solid rgba(17,24,39,.08);
    }
    .nav-inner{
      display:flex;
      align-items:center;
      justify-content:space-between;
      gap:14px;
      padding:12px 0;
    }
    .brand{
      display:flex;
      align-items:center;
      gap:10px;
      min-width:140px;
    }
    .logo{
      width:36px;height:36px;
      border-radius:12px;
      display:grid;place-items:center;
      background:linear-gradient(145deg, rgba(17,24,39,.08), rgba(17,24,39,.03));
      border:1px solid rgba(17,24,39,.14);
      box-shadow:0 8px 18px rgba(17,24,39,.06);
      font-weight:800;
      letter-spacing:.02em;
    }
    .brand strong{
      font-size:14px;
      color:var(--text);
      letter-spacing:.02em;
    }
    .brand span{
      display:block;
      font-size:12px;
      color:var(--muted);
      margin-top:2px;
    }

    .nav-actions{
      display:flex;
      align-items:center;
      justify-content:flex-end;
      gap:10px;
      flex:1;
      min-width:0;
    }
    .menu{
      display:flex;
      align-items:center;
      gap:18px;
      flex-wrap:wrap;
      justify-content:flex-end;
    }
    .menu a{
      font-size:13px;
      color:var(--muted);
      padding:8px 10px;
      border-radius:12px;
      border:1px solid transparent;
      transition: background .2s ease, border-color .2s ease, color .2s ease, transform .2s ease;
      white-space:nowrap;
    }
    .menu a:hover{
      background:rgba(17,24,39,.04);
      border-color:rgba(17,24,39,.10);
      color:var(--text);
      transform: translateY(-1px);
    }
    .nav-cta{
      display:flex;
      align-items:center;
      gap:10px;
      margin-left:6px;
    }
    .btn{
      border:1px solid rgba(17,24,39,.14);
      background:#fff;
      color:var(--text);
      padding:10px 12px;
      border-radius:14px;
      font-size:13px;
      font-weight:600;
      transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease, background .18s ease;
      box-shadow:0 8px 18px rgba(17,24,39,.06);
      display:inline-flex;
      align-items:center;
      gap:8px;
      white-space:nowrap;
    }
    .btn:hover{
      transform: translateY(-1px);
      border-color:rgba(17,24,39,.22);
      box-shadow:0 12px 26px rgba(17,24,39,.12);
    }
    .btn.primary{
      background:linear-gradient(180deg, #1f4bff, #163fc4);
      border-color:transparent;
      color:#fff;
      box-shadow:0 14px 30px rgba(31,75,255,.22);
    }
    .btn.primary:hover{
      box-shadow:0 18px 36px rgba(31,75,255,.28);
    }
    .icon-dot{
      width:10px;height:10px;border-radius:50%;
      background:rgba(255,255,255,.9);
      box-shadow:0 0 0 4px rgba(255,255,255,.18);
    }
    .mobile-toggle{
      display:none;
      width:42px;height:42px;
      border-radius:14px;
      border:1px solid rgba(17,24,39,.14);
      background:#fff;
      box-shadow:0 8px 18px rgba(17,24,39,.06);
      align-items:center;justify-content:center;
      transition: transform .18s ease, border-color .18s ease;
    }
    .mobile-toggle:hover{transform: translateY(-1px); border-color:rgba(17,24,39,.22)}
    .burger{
      width:18px;height:12px; position:relative;
    }
    .burger i{
      position:absolute; left:0; right:0;
      height:2px; border-radius:2px;
      background:rgba(17,24,39,.75);
      transition: transform .2s ease, top .2s ease, opacity .2s ease;
    }
    .burger i:nth-child(1){top:0}
    .burger i:nth-child(2){top:5px}
    .burger i:nth-child(3){top:10px}
    .mobile-toggle[aria-expanded="true"] .burger i:nth-child(1){top:5px; transform: rotate(45deg)}
    .mobile-toggle[aria-expanded="true"] .burger i:nth-child(2){opacity:0}
    .mobile-toggle[aria-expanded="true"] .burger i:nth-child(3){top:5px; transform: rotate(-45deg)}

    .mobile-panel{
      display:none;
      padding:10px 0 16px;
    }
    .mobile-panel .menu{
      display:flex;
      flex-direction:column;
      align-items:stretch;
      gap:10px;
    }
    .mobile-panel .menu a{
      width:100%;
      border:1px solid rgba(17,24,39,.12);
      background:#fff;
      padding:12px 12px;
      border-radius:16px;
      box-shadow:0 10px 26px rgba(17,24,39,.06);
    }
    .mobile-panel .nav-cta{
      margin-top:10px;
      justify-content:space-between;
    }

    main{padding:24px 0 10px}
    .hero{
      border-radius:var(--radius2);
      background:
        radial-gradient(700px 320px at 10% 0%, rgba(31,75,255,.14), transparent 60%),
        radial-gradient(520px 260px at 90% 25%, rgba(17,24,39,.08), transparent 60%),
        linear-gradient(180deg, rgba(255,255,255,.92), rgba(255,255,255,.72));
      border:1px solid rgba(17,24,39,.10);
      box-shadow:var(--shadow);
      overflow:hidden;
      position:relative;
    }
    .hero:before{
      content:"";
      position:absolute;
      inset:-2px;
      background:
        radial-gradient(380px 180px at 20% 0%, rgba(31,75,255,.20), transparent 60%),
        radial-gradient(420px 220px at 95% 30%, rgba(17,24,39,.10), transparent 60%);
      opacity:.55;
      pointer-events:none;
    }
    .hero-inner{
      position:relative;
      display:grid;
      grid-template-columns: 1.15fr .85fr;
      gap:22px;
      padding:26px;
      align-items:start;
    }
    .hero h1{
      margin:0;
      font-size:30px;
      line-height:1.2;
      letter-spacing:-.02em;
    }
    .lead{
      margin:12px 0 0;
      color:var(--muted);
      font-size:15px;
      line-height:1.7;
      max-width:62ch;
    }
    .hero-tags{
      margin-top:14px;
      display:flex;
      gap:10px;
      flex-wrap:wrap;
    }
    .chip{
      display:inline-flex;
      align-items:center;
      gap:8px;
      padding:8px 10px;
      border-radius:999px;
      background:rgba(17,24,39,.04);
      border:1px solid rgba(17,24,39,.10);
      color:var(--muted);
      font-size:12px;
    }
    .chip b{color:var(--text); font-weight:700}
    .hero-actions{
      margin-top:18px;
      display:flex;
      gap:12px;
      flex-wrap:wrap;
      align-items:center;
    }
    .ghost{
      background:rgba(255,255,255,.65);
      border:1px solid rgba(17,24,39,.14);
      box-shadow:0 10px 26px rgba(17,24,39,.06);
      color:var(--text);
    }
    .section{
      padding:18px 0;
    }
    .grid-2{
      display:grid;
      grid-template-columns: 1fr 1fr;
      gap:14px;
      align-items:start;
    }
    .card{
      background:var(--card);
      border:1px solid rgba(17,24,39,.10);
      border-radius:var(--radius);
      box-shadow:0 10px 26px rgba(17,24,39,.06);
      padding:16px;
      transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease;
    }
    .card:hover{
      transform: translateY(-2px);
      box-shadow:0 14px 30px rgba(17,24,39,.10);
      border-color:rgba(17,24,39,.18);
    }
    .kicker{
      display:flex;align-items:center;gap:10px;
      color:var(--subtle);
      font-size:12px;
      text-transform:uppercase;
      letter-spacing:.12em;
    }
    .kicker .bar{
      width:16px;height:2px;border-radius:2px;
      background:linear-gradient(90deg, rgba(31,75,255,.7), rgba(17,24,39,.2));
    }
    h2{
      margin:10px 0 8px;
      font-size:18px;
      letter-spacing:-.01em;
    }
    .card p{
      margin:0;
      color:var(--muted);
      line-height:1.7;
      font-size:14px;
    }
    .list{
      margin:12px 0 0;
      padding:0;
      list-style:none;
      display:grid;
      gap:10px;
    }
    .li{
      display:flex;
      gap:10px;
      align-items:flex-start;
    }
    .tick{
      width:18px;height:18px;border-radius:6px;
      border:1px solid rgba(31,75,255,.25);
      background:rgba(31,75,255,.10);
      display:grid;place-items:center;
      margin-top:2px;
      flex:0 0 auto;
    }
    .tick svg{display:block}
    .li b{
      display:block;
      font-size:13px;
      margin-top:-1px;
    }
    .li span{
      display:block;
      font-size:13px;
      color:var(--muted);
      margin-top:2px;
      line-height:1.55;
    }

    .toc{
      display:flex;
      flex-wrap:wrap;
      gap:10px;
      margin-top:12px;
    }
    .toc a{
      font-size:13px;
      color:var(--muted);
      padding:10px 12px;
      border-radius:14px;
      border:1px solid rgba(17,24,39,.10);
      background:rgba(255,255,255,.7);
      transition: transform .18s ease, border-color .18s ease, color .18s ease, background .18s ease;
    }
    .toc a:hover{
      transform: translateY(-1px);
      border-color:rgba(31,75,255,.28);
      color:var(--text);
      background:#fff;
    }

    .section-title{
      display:flex; align-items:flex-end; justify-content:space-between;
      gap:12px;
      margin:10px 0 10px;
    }
    .section-title h2{
      margin:0;
      font-size:18px;
    }
    .section-title p{
      margin:0;
      color:var(--muted);
      font-size:13px;
      line-height:1.6;
      max-width:46ch;
      text-align:right;
    }

    .steps{
      display:grid;
      grid-template-columns: repeat(3, 1fr);
      gap:12px;
    }
    .step{
      padding:14px;
      border-radius:var(--radius);
      border:1px solid rgba(17,24,39,.10);
      background:
        linear-gradient(180deg, rgba(255,255,255,.95), rgba(255,255,255,.75));
      box-shadow:0 10px 26px rgba(17,24,39,.06);
      transition: transform .18s ease, box-shadow .18s ease;
      position:relative;
      overflow:hidden;
    }
    .step:after{
      content:"";
      position:absolute;
      right:-60px; top:-60px;
      width:140px; height:140px;
      background:radial-gradient(circle at 30% 30%, rgba(31,75,255,.16), transparent 60%);
      transform: rotate(10deg);
      pointer-events:none;
      opacity:.9;
    }
    .step:hover{transform: translateY(-2px); box-shadow:0 14px 30px rgba(17,24,39,.10)}
    .step .num{
      width:36px;height:36px;
      border-radius:14px;
      display:grid;place-items:center;
      border:1px solid rgba(17,24,39,.14);
      background:rgba(17,24,39,.03);
      font-weight:800;
      color:var(--accent2);
    }
    .step h3{
      margin:10px 0 6px;
      font-size:14px;
      letter-spacing:-.01em;
    }
    .step p{
      margin:0;
      color:var(--muted);
      font-size:13px;
      line-height:1.65;
    }

    .media-card{
      padding:16px;
      display:flex;
      gap:14px;
      align-items:flex-start;
    }
    .thumb{
      width:160px;
      flex:0 0 auto;
      border-radius:16px;
      border:1px solid rgba(17,24,39,.10);
      background:linear-gradient(180deg, rgba(17,24,39,.04), rgba(17,24,39,.02));
      overflow:hidden;
      position:relative;
    }
    .thumb img{
      width:100%;
      height:auto;
      display:block;
      object-fit:contain;
    }
    .thumb:before{
      content:"";
      position:absolute; inset:0;
      background: radial-gradient(220px 120px at 30% 0%, rgba(31,75,255,.16), transparent 55%);
      pointer-events:none;
      opacity:.8;
    }
    .media-card h2{margin-top:2px}
    .media-card p{margin-top:6px}
    .inner-links{
      margin-top:12px;
      display:flex;
      flex-wrap:wrap;
      gap:10px;
    }
    .pill-link{
      border:1px solid rgba(17,24,39,.12);
      background:rgba(255,255,255,.75);
      padding:9px 11px;
      border-radius:999px;
      font-size:13px;
      color:var(--muted);
      transition: transform .18s ease, border-color .18s ease, color .18s ease, background .18s ease;
    }
    .pill-link:hover{
      transform: translateY(-1px);
      border-color:rgba(31,75,255,.28);
      color:var(--text);
      background:#fff;
    }

    .faq{
      display:grid;
      grid-template-columns: 1fr;
      gap:10px;
    }
    details.faq-item{
      border:1px solid rgba(17,24,39,.10);
      border-radius:16px;
      background:rgba(255,255,255,.82);
      box-shadow:0 10px 26px rgba(17,24,39,.05);
      padding:12px 14px;
      transition: border-color .18s ease, transform .18s ease, background .18s ease;
    }
    details.faq-item[open]{
      border-color:rgba(31,75,255,.30);
      background:#fff;
      transform: translateY(-1px);
    }
    summary{
      cursor:pointer;
      list-style:none;
      display:flex;
      align-items:center;
      justify-content:space-between;
      gap:12px;
      font-weight:700;
      font-size:14px;
      color:var(--text);
      outline:none;
    }
    summary::-webkit-details-marker{display:none}
    .sum-right{
      display:flex; align-items:center; gap:10px;
      color:var(--muted);
      font-weight:600;
      font-size:12px;
      flex:0 0 auto;
    }
    .plus{
      width:26px;height:26px;border-radius:10px;
      border:1px solid rgba(17,24,39,.12);
      background:rgba(17,24,39,.03);
      display:grid; place-items:center;
      transition: transform .18s ease, border-color .18s ease;
    }
    details[open] .plus{transform: rotate(45deg); border-color:rgba(31,75,255,.30)}
    details p{
      margin:10px 0 0;
      color:var(--muted);
      font-size:13.5px;
      line-height:1.75;
    }
    .callout{
      display:flex; gap:12px; align-items:flex-start;
      padding:16px;
      border-radius:var(--radius);
      border:1px solid rgba(17,24,39,.10);
      background:
        linear-gradient(180deg, rgba(255,255,255,.92), rgba(255,255,255,.72));
      box-shadow:0 10px 26px rgba(17,24,39,.06);
    }
    .callout .badge{
      width:44px;height:44px;border-radius:16px;
      border:1px solid rgba(31,75,255,.28);
      background:rgba(31,75,255,.10);
      display:grid;place-items:center;
      flex:0 0 auto;
    }
    .callout b{display:block; font-size:14px}
    .callout span{display:block; margin-top:6px; color:var(--muted); font-size:13.5px; line-height:1.7}

    footer{
      margin-top:10px;
      background:linear-gradient(180deg, rgba(246,247,251,.86), rgba(246,247,251,.96));
      border-top:1px solid rgba(17,24,39,.08);
      padding:18px 0 22px;
    }
    .footer-inner{
      display:grid;
      grid-template-columns: 1.2fr .8fr;
      gap:14px;
      align-items:start;
    }
    .footer-card{
      background:#fff;
      border:1px solid rgba(17,24,39,.10);
      border-radius:var(--radius);
      padding:14px;
      box-shadow:0 10px 26px rgba(17,24,39,.06);
    }
    .footer-title{
      display:flex; align-items:center; gap:10px;
      font-weight:800;
      letter-spacing:-.01em;
    }
    .footer-title i{
      width:10px;height:10px;border-radius:50%;
      background:rgba(31,75,255,.65);
      box-shadow:0 0 0 5px rgba(31,75,255,.14);
    }
    .footer-card p{
      margin:10px 0 0;
      color:var(--muted);
      font-size:13.5px;
      line-height:1.7;
    }
    .qr-row{
      display:flex; gap:12px; align-items:flex-start;
      margin-top:12px; flex-wrap:wrap;
    }
    .qr{
      width:128px;
      border-radius:16px;
      border:1px solid rgba(17,24,39,.10);
      background:rgba(17,24,39,.02);
      padding:10px;
    }
    .qr img{width:100%; height:auto; display:block; border-radius:12px}
    .qr .label{
      margin-top:8px;
      font-size:12px;
      color:var(--muted);
      line-height:1.4;
      text-align:center;
    }

    .footer-links{
      display:grid;
      gap:10px;
    }
    .link-grid{
      display:flex;
      flex-wrap:wrap;
      gap:10px;
      margin-top:10px;
    }
    .footer-a{
      border:1px solid rgba(17,24,39,.12);
      border-radius:14px;
      padding:10px 12px;
      background:#fff;
      font-size:13px;
      color:var(--muted);
      transition: transform .18s ease, border-color .18s ease, color .18s ease, background .18s ease;
    }
    .footer-a:hover{
      transform: translateY(-1px);
      border-color:rgba(31,75,255,.30);
      background:rgba(31,75,255,.06);
      color:var(--text);
    }
    .copyright{
      margin-top:14px;
      color:var(--muted);
      font-size:12.5px;
      text-align:center;
    }

    .scroll-top{
      position:fixed;
      right:18px;
      bottom:18px;
      z-index:60;
      width:44px;height:44px;
      border-radius:16px;
      border:1px solid rgba(17,24,39,.14);
      background:rgba(255,255,255,.92);
      box-shadow:0 12px 26px rgba(17,24,39,.14);
      display:grid;place-items:center;
      cursor:pointer;
      opacity:0;
      transform: translateY(10px);
      pointer-events:none;
      transition: opacity .2s ease, transform .2s ease;
    }
    .scroll-top.show{
      opacity:1;
      transform: translateY(0);
      pointer-events:auto;
    }
    .scroll-top:hover{border-color:rgba(31,75,255,.30)}
    .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: 920px){
      .hero-inner{grid-template-columns: 1fr; padding:18px}
      .section-title p{text-align:left}
      .steps{grid-template-columns: 1fr}
      .grid-2{grid-template-columns: 1fr}
      .thumb{width:140px}
      .footer-inner{grid-template-columns:1fr}
      .menu{display:none}
      .nav-cta{display:none}
      .mobile-toggle{display:flex}
      .mobile-panel{display:block}
    }