:root{
    --ink:#101828; --ink2:#344054; --mut:#667085; --line:#e4e7ec;
    --paper:#ffffff; --tint:#f8fafc;
    --brand:#0e9384; --brand-d:#0b7a6e;
    --amber:#f79009; --amber-bg:#fff4e0; --red:#e04343;
    --win:#0078d4; --mac:#111;
    --radius:14px;
  }
  *{box-sizing:border-box;margin:0}
  body{font-family:"PingFang SC","Microsoft YaHei","Segoe UI",sans-serif;
       background:var(--paper);color:var(--ink);line-height:1.7;
       -webkit-font-smoothing:antialiased}
  .wrap{max-width:1060px;margin:0 auto;padding:0 24px}
  a{color:var(--brand)}

  /* ---------- 顶栏 ---------- */
  nav{position:sticky;top:0;background:rgba(255,255,255,.92);backdrop-filter:blur(10px);
      border-bottom:1px solid var(--line);z-index:50}
  nav .wrap{display:flex;align-items:center;justify-content:space-between;height:60px}
  .logo{font-weight:800;font-size:17px;letter-spacing:.5px;display:flex;align-items:center;gap:9px}
  .logo img{height:28px;width:auto;object-fit:contain;display:block}
  .logo .ver{font-size:12px;font-weight:600;color:var(--brand);background:rgba(14,147,132,.10);padding:3px 10px;border-radius:999px;margin-left:6px}
  .logo i{width:22px;height:22px;border-radius:6px;background:var(--ink);color:#fff;
          font-style:normal;font-size:12px;display:grid;place-items:center;font-weight:700}
  .nav-cta{font-size:14px;font-weight:600;background:var(--ink);color:#fff;text-decoration:none;
           padding:8px 18px;border-radius:999px}
  .nav-cta:hover{background:var(--brand)}

  /* ---------- Hero ---------- */
  .hero{padding:76px 0 64px;border-bottom:1px solid var(--line)}
  .hero .wrap{max-width:780px;margin:0 auto;text-align:center}
  .hero .cta-row,.hero .trust-row{justify-content:center}
  .kicker{font-size:13px;font-weight:700;letter-spacing:2px;color:var(--brand)}
  .hero h1{font-size:42px;line-height:1.25;margin:14px 0 16px;font-weight:800;letter-spacing:-.5px}
  .hero h1 em{font-style:normal;color:var(--brand);
              box-shadow:inset 0 -10px 0 rgba(14,147,132,.16)}
  .hero p.sub{font-size:17px;color:var(--ink2);max-width:30em;margin-left:auto;margin-right:auto}
  .meta-line{margin-top:14px;font-size:13.5px;color:var(--mut)}
  .meta-line b{color:var(--ink2)}
  .cta-row{display:flex;gap:14px;margin-top:30px;flex-wrap:wrap}
  .btn{display:inline-flex;align-items:center;gap:8px;text-decoration:none;font-weight:700;
       padding:14px 30px;border-radius:12px;font-size:16px;transition:.15s}
  .btn-p{background:var(--brand);color:#fff;box-shadow:0 8px 20px rgba(14,147,132,.28)}
  .btn-p:hover{background:var(--brand-d);transform:translateY(-1px)}
  .btn-g{border:1.5px solid var(--line);color:var(--ink2);background:#fff}
  .btn-g:hover{border-color:var(--ink2)}
  .trust-row{display:flex;gap:22px;margin-top:26px;flex-wrap:wrap}
  .trust-row span{font-size:13.5px;color:var(--ink2);display:flex;gap:7px;align-items:center}
  .trust-row b{color:var(--brand);font-size:15px}

  /* ---------- 区块通用 ---------- */
  section{padding:72px 0;border-bottom:1px solid var(--line)}
  .sec-head{max-width:44em;margin-bottom:40px}
  .sec-head.center{max-width:36em;margin:0 auto 40px;text-align:center}
  .sec-head .kicker{display:block;margin-bottom:10px}
  .sec-head h2{font-size:30px;font-weight:800;letter-spacing:-.5px;line-height:1.3}
  .sec-head p{color:var(--mut);margin-top:10px;font-size:15.5px}

  /* 场景 */
  .scenes{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
  .scene{border:1px solid var(--line);border-radius:var(--radius);padding:22px 22px 20px;
         transition:.15s;background:#fff}
  .scene:hover{border-color:var(--brand);box-shadow:0 10px 26px rgba(14,147,132,.10);
               transform:translateY(-2px)}
  .scene .no{font-family:Consolas,monospace;font-size:12px;color:var(--brand);
             font-weight:700;letter-spacing:1px}
  .scene h3{font-size:16.5px;margin:8px 0 6px}
  .scene p{font-size:13.5px;color:var(--mut);line-height:1.75}

  /* 能力 */
  .cap-grid{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:start}
  .fmt-list{display:flex;flex-direction:column;gap:10px}
  .fmt{display:flex;align-items:center;gap:14px;border:1px solid var(--line);
       border-radius:12px;padding:13px 16px}
  .fmt b{font-size:14.5px}
  .fmt span{font-size:12.5px;color:var(--mut)}
  .fmt .ext{font-family:Consolas,monospace;font-size:11.5px;background:var(--tint);
            border:1px solid var(--line);border-radius:6px;padding:3px 8px;color:var(--ink2)}
  .ent-tags{display:flex;flex-wrap:wrap;gap:8px}
  .ent{font-size:13px;border:1px solid var(--line);background:var(--tint);
       border-radius:999px;padding:6px 14px;color:var(--ink2)}
  .cap-note{margin-top:16px;font-size:13px;color:var(--mut);border-left:3px solid var(--amber);
            padding-left:12px}

  /* 流程 */
  .steps{display:grid;grid-template-columns:repeat(4,1fr);gap:0;counter-reset:st}
  .step{padding:0 22px;position:relative}
  .step + .step::before{content:"";position:absolute;left:0;top:24px;bottom:24px;
                        width:1px;background:var(--line)}
  .step .num{font-family:Consolas,monospace;font-size:26px;font-weight:700;color:var(--brand)}
  .step h3{font-size:16px;margin:10px 0 6px}
  .step p{font-size:13.5px;color:var(--mut)}

  /* 授权 */
  .lic-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}
  .lic{border:1px solid var(--line);border-radius:var(--radius);padding:28px}
  .lic.hot{border:2px solid var(--brand);background:linear-gradient(180deg,#f0fdfb,#fff)}
  .lic .tagline{font-size:13px;font-weight:700;color:var(--brand);letter-spacing:1px}
  .lic h3{font-size:21px;margin:8px 0 4px}
  .lic .price{font-size:15px;color:var(--mut);margin-bottom:14px}
  .lic ul{list-style:none;padding:0}
  .lic li{font-size:14px;color:var(--ink2);padding:6px 0 6px 24px;position:relative}
  .lic li::before{content:"✓";position:absolute;left:0;color:var(--brand);font-weight:700}

  /* FAQ */
  details{border:1px solid var(--line);border-radius:12px;margin-bottom:10px;background:#fff}
  summary{cursor:pointer;padding:16px 20px;font-weight:600;font-size:15px;list-style:none;
          display:flex;justify-content:space-between;align-items:center}
  summary::after{content:"+";color:var(--brand);font-size:20px;font-weight:400}
  details[open] summary::after{content:"–"}
  details .a{padding:0 20px 18px;font-size:14px;color:var(--mut)}

  /* ---------- 下载区（双平台） ---------- */
  .download{background:var(--tint)}
  .download .sec-head.center{margin-bottom:36px}
  .plat-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px}
  .plat{border:1px solid var(--line);border-radius:var(--radius);background:#fff;overflow:hidden;
        display:flex;flex-direction:column}
  .plat-head{padding:18px 24px;border-bottom:1px solid var(--line);
             display:flex;align-items:center;gap:12px;background:linear-gradient(180deg,#fff,var(--tint))}
  .plat-head .plat-icon{width:36px;height:36px;border-radius:10px;display:grid;place-items:center;
             color:#fff;font-weight:800}
  .plat-head .plat-icon.win{background:linear-gradient(135deg,#0078d4,#005ba1)}
  .plat-head .plat-icon.mac{background:linear-gradient(135deg,#222,#000)}
  .plat-head h3{font-size:18px;margin:0;display:flex;align-items:center;gap:8px}
  .plat-head .plat-tag{font-size:11px;font-weight:700;padding:2px 8px;border-radius:999px;
                background:rgba(14,147,132,.10);color:var(--brand);letter-spacing:.5px}
  .plat-head .plat-tag.new{background:rgba(247,144,9,.12);color:#b55b00}
  .plat-body{padding:24px;flex:1;display:flex;flex-direction:column;gap:18px}
  .cloud-row{display:grid;grid-template-columns:90px 1fr;gap:14px;align-items:center;
             border:1px solid var(--line);border-radius:12px;padding:12px 14px}
  .cloud-row .qr{width:90px;height:90px;border:1px solid var(--line);border-radius:8px;padding:4px;background:#fff}
  .cloud-row .qr img{width:100%;height:100%;object-fit:contain}
  .cloud-row .info{font-size:13.5px;line-height:1.7}
  .cloud-row .info b{font-size:14.5px;display:block;margin-bottom:4px}
  .cloud-row .info .link{display:flex;align-items:center;flex-wrap:wrap;gap:6px;margin-top:2px}
  .cloud-row .info a{font-size:13px}
  .cloud-row .code{color:var(--brand);font-weight:700;background:rgba(14,147,132,.08);
                   padding:1px 8px;border-radius:6px;font-family:Consolas,monospace}
  .cloud-row .btn{padding:8px 16px;font-size:13px;margin-top:8px}
  .local-card{border:1px dashed var(--line);border-radius:12px;padding:16px;
              background:var(--tint);text-align:center;display:flex;flex-direction:column;gap:8px}
  .local-card b{font-size:14px}
  .local-card p{font-size:12.5px;color:var(--mut)}
  .local-card .btn{padding:10px 20px;font-size:14px}
  .local-card .meta{font-size:12px;color:var(--mut)}
  .plat-foot{padding:14px 24px;border-top:1px dashed var(--line);background:var(--tint);
             font-size:12.5px;color:var(--mut);text-align:center}

  /* 底部 CTA */
  .final{background:var(--ink);color:#fff;border-bottom:none;text-align:center}
  .final h2{font-size:30px;font-weight:800;letter-spacing:-.5px}
  .final p{color:#98a2b3;margin:14px auto 0;max-width:34em}
  .final .btn-p{margin-top:28px}
  .final .meta-line{color:#667085}
  footer{padding:28px 0;text-align:center;font-size:12.5px;color:var(--mut)}

  @media(max-width:880px){
    .hero h1{font-size:32px}
    .scenes{grid-template-columns:1fr 1fr}
    .cap-grid{grid-template-columns:1fr;gap:28px}
    .steps{grid-template-columns:1fr 1fr;gap:26px}
    .step+.step::before{display:none}
    .lic-grid{grid-template-columns:1fr}
    .plat-grid{grid-template-columns:1fr;gap:18px}
  }
  @media(max-width:560px){
    .scenes{grid-template-columns:1fr}
    .steps{grid-template-columns:1fr}
    .cloud-row{grid-template-columns:72px 1fr;gap:12px}
    .cloud-row .qr{width:72px;height:72px}
  }

  /* ---------- 二级页面通用 ---------- */
  .nav-links{display:flex;gap:22px;align-items:center}
  .nav-links a{font-size:14px;color:var(--ink2);text-decoration:none;font-weight:500}
  .nav-links a:hover{color:var(--brand)}
  .page-hero{padding:60px 0 38px;border-bottom:1px solid var(--line)}
  .page-hero .wrap{max-width:820px}
  .page-hero h1{font-size:36px;font-weight:800;letter-spacing:-.5px;margin:12px 0 12px;line-height:1.3}
  .page-hero p.sub{font-size:16px;color:var(--ink2);max-width:34em}
  .crumb{font-size:13px;color:var(--mut);margin-bottom:10px}
  .crumb a{color:var(--brand);text-decoration:none}
  .article{max-width:780px}
  .article p{margin:14px 0;color:var(--ink2);font-size:15.5px;line-height:1.9}
  .article h3{font-size:20px;margin:30px 0 10px;font-weight:700}
  .article ul.tick{list-style:none;padding:0;margin:10px 0}
  .article ul.tick li{position:relative;padding:9px 0 9px 30px;font-size:15px;color:var(--ink2);
       border-bottom:1px solid var(--line)}
  .article ul.tick li::before{content:"¹3";position:absolute;left:0;color:var(--brand);font-weight:700}
  .callout{border-left:3px solid var(--brand);background:var(--tint);padding:16px 18px;border-radius:0 12px 12px 0;
       margin:18px 0;font-size:15px;color:var(--ink2)}
  .foot-links{margin-bottom:8px;font-size:13px}
  .foot-links a{color:inherit;text-decoration:none}
  .foot-links a:hover{color:var(--brand)}
  @media(max-width:680px){.nav-links{display:none}}