:root{
      --bg:#fbfbfc;
      --card:#ffffff;
      --text:#17181a;
      --muted:#5b5f6a;
      --subtle:#8b90a0;
      --border:rgba(20,22,26,.10);
      --shadow:0 10px 30px rgba(20,22,26,.06);
      --shadow2:0 8px 18px rgba(20,22,26,.08);
      --accent:#1f6feb;
      --accent2:#0ea5e9;
      --ring:rgba(31,111,235,.25);
      --radius:18px;
      --radius2:14px;
      --container:1120px;
    }
    *{box-sizing:border-box}
    html,body{height:100%}
    body{
      margin:0;
      font-family: -apple-system, BlinkMacSystemFont, "PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC", Arial, sans-serif;
      background: linear-gradient(180deg, #fbfbfc 0%, #ffffff 60%, #fbfbfc 100%);
      color:var(--text);
      overflow-x:hidden;
    }
    a{color:inherit; text-decoration:none}
    .container{
      max-width:var(--container);
      margin:0 auto;
      padding:0 20px;
    }
    .topbar{
      position:sticky;
      top:0;
      z-index:50;
      background: rgba(251,251,252,.72);
      backdrop-filter: blur(10px);
      border-bottom:1px solid rgba(20,22,26,.06);
    }
    .topbar-inner{
      display:flex;
      align-items:center;
      justify-content:space-between;
      gap:14px;
      padding:14px 0;
    }
    .brand{
      display:flex;
      align-items:center;
      gap:12px;
      min-width:140px;
    }
    .logo{
      width:36px;
      height:36px;
      border-radius:12px;
      display:flex;
      align-items:center;
      justify-content:center;
      font-weight:800;
      letter-spacing:.5px;
      background: radial-gradient(120% 120% at 20% 20%, #2a7bff 0%, #1f6feb 40%, #0ea5e9 100%);
      color:#fff;
      box-shadow:0 10px 22px rgba(31,111,235,.22);
    }
    .brand-title{
      display:flex;
      flex-direction:column;
      line-height:1.05;
    }
    .brand-title strong{
      font-size:14px;
      letter-spacing:.2px;
    }
    .brand-title span{
      font-size:12px;
      color:var(--subtle);
      margin-top:4px;
      white-space:nowrap;
    }

    .nav{
      display:flex;
      align-items:center;
      gap:10px;
      flex-wrap:wrap;
      justify-content:flex-end;
    }
    .nav a{
      font-size:13px;
      color:var(--muted);
      padding:9px 10px;
      border-radius:12px;
      transition: background .2s ease, color .2s ease;
      outline:none;
    }
    .nav a:hover{
      background: rgba(31,111,235,.08);
      color:#0f172a;
    }
    .nav .cta{
      background: rgba(31,111,235,.12);
      color:#0b2a57;
      border:1px solid rgba(31,111,235,.25);
    }
    .nav .cta:hover{
      background: rgba(31,111,235,.16);
      color:#0b2a57;
    }

    .hero{
      position:relative;
      padding:34px 0 22px;
    }
    .hero-grid{
      display:grid;
      grid-template-columns: 1.2fr .8fr;
      gap:18px;
      align-items:start;
    }
    .hero-card{
      background:
        radial-gradient(1000px 420px at -10% -20%, rgba(31,111,235,.12) 0%, rgba(31,111,235,0) 52%),
        radial-gradient(800px 360px at 85% 10%, rgba(14,165,233,.10) 0%, rgba(14,165,233,0) 55%),
        linear-gradient(180deg, rgba(255,255,255,.88) 0%, rgba(255,255,255,.98) 100%);
      border:1px solid rgba(20,22,26,.08);
      border-radius: var(--radius);
      box-shadow: var(--shadow);
      padding:22px 22px 18px;
      overflow:hidden;
      animation: riseIn .65s ease both;
    }
    @keyframes riseIn{
      from{opacity:0; transform: translateY(10px)}
      to{opacity:1; transform: translateY(0)}
    }
    .kicker{
      display:flex;
      align-items:center;
      gap:10px;
      color:var(--muted);
      font-size:13px;
      margin-bottom:10px;
    }
    .pill{
      display:inline-flex;
      align-items:center;
      gap:8px;
      padding:8px 10px;
      border-radius:999px;
      background: rgba(31,111,235,.10);
      border:1px solid rgba(31,111,235,.18);
      color:#0b2a57;
      font-weight:600;
      letter-spacing:.1px;
      white-space:nowrap;
    }
    .dot{
      width:8px;height:8px;border-radius:50%;
      background: linear-gradient(180deg, #2a7bff 0%, #0ea5e9 100%);
      box-shadow:0 0 0 6px rgba(31,111,235,.10);
    }
    h1{
      font-size:30px;
      margin:0 0 10px;
      letter-spacing:-.6px;
    }
    .lead{
      margin:0;
      color:var(--muted);
      line-height:1.7;
      font-size:14.5px;
      max-width:64ch;
    }
    .hero-actions{
      display:flex;
      gap:10px;
      flex-wrap:wrap;
      margin-top:16px;
      align-items:center;
    }
    .btn{
      display:inline-flex;
      align-items:center;
      justify-content:center;
      gap:10px;
      padding:11px 14px;
      border-radius:14px;
      border:1px solid rgba(20,22,26,.12);
      background: var(--card);
      color:#101215;
      font-weight:650;
      font-size:13.5px;
      transition: transform .15s ease, box-shadow .2s ease, border-color .2s ease, background .2s ease;
      box-shadow: 0 8px 20px rgba(20,22,26,.05);
      outline:none;
      cursor:pointer;
      user-select:none;
    }
    .btn:hover{transform: translateY(-1px); box-shadow: 0 12px 26px rgba(20,22,26,.10); border-color: rgba(20,22,26,.18)}
    .btn:active{transform: translateY(0)}
    .btn.primary{
      background: linear-gradient(180deg, rgba(31,111,235,.98) 0%, rgba(14,165,233,.95) 100%);
      border-color: rgba(31,111,235,.35);
      color:#fff;
      box-shadow: 0 14px 34px rgba(31,111,235,.28);
    }
    .btn.primary:hover{box-shadow: 0 18px 44px rgba(31,111,235,.36); border-color: rgba(31,111,235,.45)}
    .btn .icon{
      width:18px;height:18px; display:inline-block;
    }

    .side-card{
      background: rgba(255,255,255,.86);
      border:1px solid rgba(20,22,26,.08);
      border-radius: var(--radius);
      box-shadow: var(--shadow2);
      padding:16px 16px 14px;
      animation: fadeUp .8s ease both;
      animation-delay:.08s;
      position:relative;
      overflow:hidden;
    }
    @keyframes fadeUp{
      from{opacity:0; transform: translateY(12px)}
      to{opacity:1; transform: translateY(0)}
    }
    .side-card:before{
      content:"";
      position:absolute; inset:-2px -2px auto auto;
      width:140px; height:140px;
      background: radial-gradient(circle at 30% 30%, rgba(31,111,235,.18) 0%, rgba(31,111,235,0) 60%);
      pointer-events:none;
    }
    .side-title{
      font-size:14px;
      font-weight:750;
      margin:0 0 10px;
      letter-spacing:-.2px;
    }
    .quick-list{
      display:flex;
      flex-direction:column;
      gap:10px;
      margin-top:10px;
    }
    .quick-item{
      display:flex;
      gap:10px;
      align-items:flex-start;
      padding:11px 12px;
      border-radius:14px;
      border:1px solid rgba(20,22,26,.08);
      background: rgba(255,255,255,.9);
      transition: transform .15s ease, border-color .2s ease;
    }
    .quick-item:hover{transform: translateY(-1px); border-color: rgba(31,111,235,.25)}
    .q-ic{
      width:28px;height:28px;border-radius:10px;
      background: rgba(31,111,235,.10);
      border:1px solid rgba(31,111,235,.18);
      display:flex; align-items:center; justify-content:center;
      color:#0b2a57;
      flex:0 0 auto;
      margin-top:1px;
    }
    .q-body{min-width:0}
    .q-body strong{
      font-size:13.5px;
      display:block;
      margin-bottom:4px;
      letter-spacing:-.2px;
    }
    .q-body span{
      font-size:12.5px;
      color:var(--muted);
      line-height:1.5;
      display:block;
    }

    main{padding:10px 0 34px}
    .article{
      display:grid;
      grid-template-columns: 1fr;
      gap:14px;
    }

    .section{
      background: rgba(255,255,255,.82);
      border:1px solid rgba(20,22,26,.08);
      border-radius: var(--radius);
      box-shadow: 0 12px 30px rgba(20,22,26,.04);
      padding:18px 18px;
      overflow:hidden;
    }

    .sec-title{
      display:flex;
      align-items:center;
      justify-content:space-between;
      gap:12px;
      margin-bottom:12px;
    }
    .sec-title h2{
      margin:0;
      font-size:16.5px;
      letter-spacing:-.2px;
    }
    .sec-title .tag{
      font-size:12.5px;
      color:#0b2a57;
      padding:7px 10px;
      border-radius:999px;
      background: rgba(31,111,235,.10);
      border:1px solid rgba(31,111,235,.18);
      white-space:nowrap;
    }

    .toc{
      display:flex;
      flex-wrap:wrap;
      gap:10px;
      margin-top:6px;
    }
    .toc a{
      display:inline-flex;
      align-items:center;
      gap:10px;
      padding:10px 12px;
      border-radius:14px;
      border:1px solid rgba(20,22,26,.10);
      background:#fff;
      font-size:13px;
      color:var(--muted);
      transition: border-color .2s ease, transform .15s ease, box-shadow .2s ease;
    }
    .toc a:hover{
      transform: translateY(-1px);
      border-color: rgba(31,111,235,.28);
      box-shadow: 0 10px 22px rgba(31,111,235,.10);
      color:#0f172a;
    }
    .toc .num{
      width:22px;height:22px;border-radius:8px;
      display:flex; align-items:center; justify-content:center;
      font-size:12px;
      font-weight:800;
      color:#0b2a57;
      background: rgba(31,111,235,.12);
      border:1px solid rgba(31,111,235,.20);
      flex:0 0 auto;
    }

    .content h3{
      margin:0 0 8px;
      font-size:15px;
      letter-spacing:-.2px;
    }
    .content p{
      margin:0 0 12px;
      color:var(--muted);
      line-height:1.8;
      font-size:14px;
    }

    .grid-2{
      display:grid;
      grid-template-columns: 1.1fr .9fr;
      gap:14px;
      align-items:start;
    }
    .split-card{
      background:#fff;
      border:1px solid rgba(20,22,26,.08);
      border-radius: var(--radius2);
      padding:14px 14px;
    }
    .split-card h3{font-size:15px; margin:0 0 10px}
    .split-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;
      padding:10px 10px;
      border-radius:12px;
      border:1px solid rgba(20,22,26,.08);
      background: rgba(251,251,252,.7);
    }
    .li .check{
      width:22px;height:22px;border-radius:9px;
      background: rgba(31,111,235,.10);
      border:1px solid rgba(31,111,235,.18);
      display:flex; align-items:center; justify-content:center;
      color:#0b2a57;
      flex:0 0 auto;
      margin-top:1px;
    }
    .li strong{display:block; font-size:13.5px; margin-bottom:4px; letter-spacing:-.2px}
    .li span{display:block; font-size:12.8px; color:var(--muted); line-height:1.55}

    .steps{
      display:flex;
      flex-direction:column;
      gap:12px;
    }
    .step{
      display:grid;
      grid-template-columns: 40px 1fr;
      gap:12px;
      align-items:start;
      padding:12px 12px;
      border-radius: var(--radius2);
      background:#fff;
      border:1px solid rgba(20,22,26,.08);
      transition: transform .16s ease, border-color .2s ease;
    }
    .step:hover{transform: translateY(-1px); border-color: rgba(31,111,235,.26)}
    .step .n{
      width:40px;height:40px;
      border-radius:16px;
      background: rgba(31,111,235,.10);
      border:1px solid rgba(31,111,235,.18);
      color:#0b2a57;
      display:flex; align-items:center; justify-content:center;
      font-weight:900;
    }
    .step strong{
      display:block;
      font-size:13.8px;
      margin-top:2px;
      margin-bottom:6px;
      letter-spacing:-.2px;
    }
    .step p{
      margin:0;
      color:var(--muted);
      line-height:1.75;
      font-size:13.8px;
    }

    .faq{
      display:flex;
      flex-direction:column;
      gap:10px;
    }
    details.faq-item{
      border-radius: var(--radius2);
      border:1px solid rgba(20,22,26,.08);
      background:#fff;
      padding:10px 12px;
      transition: border-color .2s ease, transform .15s ease;
    }
    details.faq-item[open]{border-color: rgba(31,111,235,.28)}
    details.faq-item summary{
      cursor:pointer;
      list-style:none;
      display:flex;
      align-items:center;
      justify-content:space-between;
      gap:12px;
      font-weight:750;
      font-size:14px;
      letter-spacing:-.2px;
      outline:none;
    }
    details.faq-item summary::-webkit-details-marker{display:none}
    .chev{
      width:28px;height:28px;border-radius:12px;
      border:1px solid rgba(20,22,26,.10);
      background: rgba(251,251,252,.8);
      display:flex; align-items:center; justify-content:center;
      color:#5b5f6a;
      flex:0 0 auto;
      transition: transform .18s ease;
    }
    details[open] .chev{transform: rotate(180deg)}
    .faq-item .answer{
      margin-top:10px;
      color:var(--muted);
      line-height:1.85;
      font-size:14px;
    }

    .callout{
      display:flex;
      gap:14px;
      align-items:flex-start;
      background: rgba(31,111,235,.06);
      border:1px solid rgba(31,111,235,.14);
      border-radius: var(--radius2);
      padding:14px 14px;
      margin-top:12px;
    }
    .callout .mark{
      width:36px;height:36px;border-radius:14px;
      background: rgba(31,111,235,.12);
      border:1px solid rgba(31,111,235,.20);
      display:flex; align-items:center; justify-content:center;
      color:#0b2a57;
      flex:0 0 auto;
      margin-top:2px;
    }
    .callout strong{display:block; margin-bottom:6px; font-size:14px}
    .callout p{margin:0; color:var(--muted); line-height:1.75; font-size:13.8px}

    .inner-links{
      display:flex;
      flex-wrap:wrap;
      gap:10px;
      margin-top:12px;
    }
    .link-chip{
      display:inline-flex;
      align-items:center;
      gap:10px;
      padding:10px 12px;
      border-radius:14px;
      border:1px solid rgba(20,22,26,.10);
      background:#fff;
      color:var(--muted);
      font-size:13.2px;
      transition: transform .15s ease, border-color .2s ease, box-shadow .2s ease;
    }
    .link-chip:hover{
      transform: translateY(-1px);
      border-color: rgba(31,111,235,.28);
      box-shadow: 0 10px 22px rgba(31,111,235,.10);
      color:#0f172a;
    }
    .chip-ic{
      width:22px;height:22px;border-radius:9px;
      display:flex; align-items:center; justify-content:center;
      background: rgba(31,111,235,.10);
      border:1px solid rgba(31,111,235,.18);
      color:#0b2a57;
      flex:0 0 auto;
    }

    .image-strip{
      display:grid;
      grid-template-columns: 1fr;
      gap:12px;
      margin-top:12px;
    }
    .figure{
      background:#fff;
      border:1px solid rgba(20,22,26,.08);
      border-radius: var(--radius2);
      padding:12px;
      display:grid;
      grid-template-columns: 150px 1fr;
      gap:12px;
      align-items:center;
    }
    .figure img{
      width:150px;
      max-width:100%;
      height:auto;
      border-radius:14px;
      border:1px solid rgba(20,22,26,.10);
      display:block;
      background: #f6f7fb;
    }
    figcaption{
      color:var(--muted);
      font-size:13.5px;
      line-height:1.7;
    }
    .article-meta-row{
      display:flex;
      flex-wrap:wrap;
      gap:10px;
      margin-top:12px;
      align-items:center;
    }
    .meta-pill{
      display:inline-flex;
      align-items:center;
      gap:10px;
      padding:9px 12px;
      border-radius:999px;
      border:1px solid rgba(20,22,26,.10);
      background: rgba(255,255,255,.9);
      color:var(--muted);
      font-size:13px;
      white-space:nowrap;
    }
    .meta-pill b{color:#101215}
    .muted{color:var(--muted)}

    footer{
      background: #f6f7fb;
      border-top:1px solid rgba(20,22,26,.08);
      padding:20px 0 26px;
    }
    .footer-grid{
      display:grid;
      grid-template-columns: 1.1fr .9fr;
      gap:14px;
      align-items:start;
    }
    .footer-card{
      background:#fff;
      border:1px solid rgba(20,22,26,.08);
      border-radius: var(--radius);
      padding:16px 16px;
    }
    .footer-card h2{
      margin:0 0 10px;
      font-size:16px;
      letter-spacing:-.2px;
    }
    .footer-card p{
      margin:0 0 12px;
      color:var(--muted);
      line-height:1.8;
      font-size:14px;
    }
    .two-col{
      display:grid;
      grid-template-columns: 1fr 1fr;
      gap:10px;
      margin-top:10px;
    }
    .kv{
      padding:12px 12px;
      border-radius:14px;
      border:1px solid rgba(20,22,26,.08);
      background: rgba(251,251,252,.7);
    }
    .kv strong{
      display:block;
      font-size:13.5px;
      margin-bottom:6px;
      letter-spacing:-.2px;
    }
    .kv span{
      color:var(--muted);
      font-size:13.2px;
      line-height:1.6;
      display:block;
    }
    .map-link{
      display:inline-flex;
      align-items:center;
      gap:10px;
      padding:11px 12px;
      border-radius:14px;
      border:1px solid rgba(31,111,235,.18);
      background: rgba(31,111,235,.10);
      color:#0b2a57;
      font-weight:700;
      font-size:13.5px;
      transition: transform .15s ease, border-color .2s ease, box-shadow .2s ease;
    }
    .map-link:hover{
      transform: translateY(-1px);
      border-color: rgba(31,111,235,.32);
      box-shadow: 0 12px 26px rgba(31,111,235,.14);
    }
    .qr-row{
      display:flex;
      gap:12px;
      align-items:flex-start;
      margin-top:12px;
      flex-wrap:wrap;
    }
    .qr{
      width:120px;
      border-radius:16px;
      overflow:hidden;
      border:1px solid rgba(20,22,26,.10);
      background:#fff;
      padding:8px;
    }
    .qr img{width:100%; height:auto; display:block}
    .foot-links{
      display:flex;
      flex-wrap:wrap;
      gap:10px;
      margin-top:10px;
    }
    .foot-links a{
      padding:9px 11px;
      border-radius:14px;
      border:1px solid rgba(20,22,26,.10);
      background:#fff;
      color:var(--muted);
      font-size:13px;
      transition: transform .15s ease, border-color .2s ease;
    }
    .foot-links a:hover{transform: translateY(-1px); border-color: rgba(31,111,235,.28); color:#0f172a}
    .copyright{
      margin-top:14px;
      color:var(--subtle);
      font-size:12.5px;
      text-align:center;
    }

    @media (max-width: 900px){
      .hero-grid{grid-template-columns: 1fr; }
      h1{font-size:26px}
      .grid-2{grid-template-columns: 1fr}
      .figure{grid-template-columns: 1fr; }
      .figure img{width:100%}
      .footer-grid{grid-template-columns: 1fr}
      .two-col{grid-template-columns: 1fr}
      .nav{gap:8px}
      .nav a{padding:9px 9px}
    }
    @media (prefers-reduced-motion: reduce){
      *{animation:none !important; transition:none !important; scroll-behavior:auto !important}
    }
    html{scroll-behavior:smooth}