:root{
      --bg:#f7f8fb;
      --panel:#ffffff;
      --text:#1f2937;
      --muted:#5b6677;
      --muted2:#7a879a;
      --line:rgba(20, 35, 55, .12);
      --brand:#0ea5e9;
      --brand2:#22c55e;
      --brand3:#7c3aed;
      --shadow: 0 18px 50px rgba(15, 23, 42, .10);
      --shadow2: 0 10px 30px rgba(15, 23, 42, .10);
      --radius:18px;
      --radius2:12px;
      --focus: 0 0 0 3px rgba(14,165,233,.25);
      --container: 1120px;
    }
    *{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", Arial, sans-serif;
      background:
        radial-gradient(1200px 500px at 15% -10%, rgba(14,165,233,.18), rgba(14,165,233,0) 60%),
        radial-gradient(900px 420px at 85% 0%, rgba(124,58,237,.14), rgba(124,58,237,0) 58%),
        radial-gradient(800px 520px at 80% 75%, rgba(34,197,94,.10), rgba(34,197,94,0) 60%),
        var(--bg);
      color:var(--text);
      overflow-x:hidden;
    }
    a{color:#0b6bcb; text-decoration:none}
    a:hover{text-decoration:underline}
    .container{
      width: min(var(--container), calc(100% - 40px));
      margin: 0 auto;
    }
    .skip{
      position:absolute; left:-999px; top:auto;
      width:1px; height:1px; overflow:hidden;
    }
    .skip:focus{left:16px; top:16px; width:auto; height:auto; padding:10px 12px; background:#fff; border:1px solid var(--line); border-radius:10px; z-index:9999; box-shadow: var(--shadow2)}
    header{
      position:sticky;
      top:0;
      z-index:50;
      backdrop-filter: blur(10px);
      background: rgba(247,248,251,.72);
      border-bottom: 1px solid rgba(20,35,55,.08);
    }
    .nav{
      display:flex;
      align-items:center;
      justify-content:space-between;
      gap:16px;
      padding:14px 0;
    }
    .brand{
      display:flex; align-items:center; gap:12px;
      min-width: 150px;
    }
    .logo{
      width:42px; height:42px;
      border-radius:14px;
      background:
        radial-gradient(12px 12px at 30% 30%, rgba(255,255,255,.8), rgba(255,255,255,0) 60%),
        linear-gradient(135deg, rgba(14,165,233,1), rgba(124,58,237,1));
      box-shadow: 0 14px 40px rgba(124,58,237,.20);
      display:flex; align-items:center; justify-content:center;
      color:#fff; font-weight:900; letter-spacing:.5px;
    }
    .brand strong{font-size:14px; line-height:1.1}
    .brand span{display:block; font-size:12px; color:var(--muted); margin-top:2px}
    .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: transform .15s ease, background .15s ease, border-color .15s ease, color .15s ease;
    }
    .menu a:hover{
      color:var(--text);
      background: rgba(255,255,255,.7);
      border-color: rgba(20,35,55,.10);
      transform: translateY(-1px);
      text-decoration:none;
    }
    .nav-cta{
      display:flex; align-items:center; gap:10px;
    }
    .btn{
      appearance:none;
      border:1px solid rgba(14,165,233,.30);
      background: linear-gradient(180deg, rgba(14,165,233,.10), rgba(14,165,233,.04));
      color:#0a3a5a;
      padding:10px 14px;
      border-radius:14px;
      font-weight:700;
      font-size:13px;
      display:inline-flex;
      align-items:center;
      gap:10px;
      box-shadow: 0 10px 30px rgba(14,165,233,.10);
      transition: transform .15s ease, box-shadow .15s ease, background .15s ease, border-color .15s ease;
      cursor:pointer;
      white-space:nowrap;
    }
    .btn:hover{
      transform: translateY(-1px);
      box-shadow: 0 18px 45px rgba(14,165,233,.16);
      border-color: rgba(14,165,233,.45);
      text-decoration:none;
    }
    .btn:focus{outline:none; box-shadow: var(--focus), 0 18px 45px rgba(14,165,233,.16)}
    .btn .dot{
      width:10px; height:10px; border-radius:999px;
      background: linear-gradient(135deg, var(--brand), var(--brand3));
      box-shadow: 0 0 0 4px rgba(14,165,233,.14);
    }
    .hamburger{
      display:none;
      width:44px; height:44px;
      border-radius:14px;
      border:1px solid rgba(20,35,55,.12);
      background: rgba(255,255,255,.65);
      cursor:pointer;
      align-items:center; justify-content:center;
      transition: transform .15s ease;
    }
    .hamburger:hover{transform: translateY(-1px)}
    .hamburger:focus{outline:none; box-shadow: var(--focus)}
    .hamburger .lines{
      width:18px; height:14px; position:relative;
    }
    .hamburger .lines span{
      position:absolute; left:0; right:0;
      height:2px; border-radius:3px;
      background: rgba(31,41,55,.86);
      transition: transform .18s ease, opacity .18s ease, top .18s ease;
    }
    .hamburger .lines span:nth-child(1){top:0}
    .hamburger .lines span:nth-child(2){top:6px}
    .hamburger .lines span:nth-child(3){top:12px}
    .nav-mobile{
      display:none;
      padding: 0 0 16px 0;
    }
    .nav-mobile .mobile-card{
      background: rgba(255,255,255,.75);
      border: 1px solid rgba(20,35,55,.10);
      border-radius: 16px;
      padding: 12px;
      box-shadow: 0 18px 50px rgba(15, 23, 42, .08);
    }
    .nav-mobile .mobile-links{
      display:flex; flex-direction:column; gap:8px;
    }
    .nav-mobile .mobile-links a{
      padding:10px 12px;
      border-radius:14px;
      color:var(--muted);
      border:1px solid rgba(20,35,55,.08);
      background: rgba(255,255,255,.7);
      font-weight:700;
      font-size:13px;
    }
    .hero{
      padding: 22px 0 6px 0;
    }
    .hero-grid{
      display:grid;
      grid-template-columns: 1.2fr .8fr;
      gap:18px;
      align-items: stretch;
    }
    .hero-card{
      background: linear-gradient(180deg, rgba(255,255,255,.86), rgba(255,255,255,.72));
      border: 1px solid rgba(20,35,55,.10);
      border-radius: var(--radius);
      box-shadow: var(--shadow2);
      padding: 22px;
      position:relative;
      overflow:hidden;
    }
    .hero-card:before{
      content:"";
      position:absolute; inset:-2px;
      background:
        radial-gradient(500px 220px at 15% 0%, rgba(14,165,233,.20), rgba(14,165,233,0) 55%),
        radial-gradient(420px 240px at 85% 20%, rgba(124,58,237,.18), rgba(124,58,237,0) 58%),
        radial-gradient(380px 240px at 55% 100%, rgba(34,197,94,.12), rgba(34,197,94,0) 60%);
      pointer-events:none;
      opacity:.9;
    }
    .hero-card > *{position:relative}
    .kicker{
      display:inline-flex; align-items:center; gap:10px;
      padding:8px 12px;
      border-radius:999px;
      border:1px solid rgba(20,35,55,.10);
      background: rgba(255,255,255,.65);
      font-weight:800;
      font-size:12px;
      color:#11384f;
    }
    .kicker i{
      width:10px; height:10px; border-radius:999px;
      background: linear-gradient(135deg, var(--brand), var(--brand3));
      box-shadow: 0 0 0 4px rgba(124,58,237,.12);
      display:inline-block;
    }
    h1{
      margin: 14px 0 10px 0;
      font-size: clamp(22px, 3.1vw, 38px);
      line-height:1.16;
      letter-spacing:-.02em;
    }
    .lede{
      color:var(--muted);
      font-size:15px;
      line-height:1.65;
      margin: 0 0 14px 0;
      max-width: 62ch;
    }
    .hero-actions{
      display:flex; gap:12px; flex-wrap:wrap;
      margin-top: 14px;
      align-items:center;
    }
    .chip-row{
      display:flex; gap:10px; flex-wrap:wrap;
      margin-top: 14px;
    }
    .chip{
      font-size:12px;
      color: rgba(17,56,79,.92);
      background: rgba(255,255,255,.7);
      border: 1px solid rgba(20,35,55,.10);
      padding: 8px 10px;
      border-radius: 999px;
      display:flex; align-items:center; gap:8px;
    }
    .chip b{
      font-size:12px;
      color:#0f3a57;
    }
    .chip em{
      font-style:normal;
      color:var(--muted);
      font-weight:800;
    }

    .side-card{
      background: rgba(255,255,255,.70);
      border: 1px solid rgba(20,35,55,.10);
      border-radius: var(--radius);
      padding: 16px;
      box-shadow: 0 18px 50px rgba(15, 23, 42, .06);
      overflow:hidden;
      position:relative;
    }
    .side-card:after{
      content:"";
      position:absolute;
      width:260px; height:260px;
      right:-140px; top:-140px;
      border-radius: 50%;
      background: radial-gradient(circle at 30% 30%, rgba(14,165,233,.25), rgba(14,165,233,0) 60%);
      pointer-events:none;
    }
    .side-card > *{position:relative}
    .side-title{
      display:flex; align-items:center; justify-content:space-between; gap:12px;
      margin-bottom: 10px;
    }
    .side-title h2{
      margin:0;
      font-size:14px;
      color:var(--muted);
      font-weight:900;
      letter-spacing:.02em;
    }
    .badge{
      font-size:12px;
      font-weight:900;
      color:#0a3a5a;
      background: linear-gradient(180deg, rgba(14,165,233,.14), rgba(14,165,233,.06));
      border: 1px solid rgba(14,165,233,.26);
      padding: 6px 10px;
      border-radius: 999px;
      white-space:nowrap;
    }
    .facts{
      display:grid;
      grid-template-columns: 1fr;
      gap:10px;
      margin-top: 8px;
    }
    .fact{
      display:flex; gap:12px; align-items:flex-start;
      padding: 12px;
      border-radius: 16px;
      border: 1px solid rgba(20,35,55,.10);
      background: rgba(255,255,255,.68);
      transition: transform .15s ease, box-shadow .15s ease;
    }
    .fact:hover{
      transform: translateY(-2px);
      box-shadow: 0 16px 35px rgba(15, 23, 42, .10);
    }
    .icon{
      width:34px; height:34px; border-radius: 14px;
      display:flex; align-items:center; justify-content:center;
      color:#082f44;
      background:
        radial-gradient(12px 12px at 30% 30%, rgba(255,255,255,.8), rgba(255,255,255,0) 60%),
        linear-gradient(135deg, rgba(14,165,233,.25), rgba(124,58,237,.18));
      border: 1px solid rgba(20,35,55,.10);
      flex:0 0 auto;
      font-weight:900;
    }
    .fact b{display:block; font-size:13px; margin-top:1px}
    .fact span{display:block; color:var(--muted); font-size:12px; line-height:1.5; margin-top:4px}

    main{padding: 10px 0 26px 0}
    .section{
      margin-top: 16px;
    }
    .section-grid{
      display:grid;
      grid-template-columns: 1fr 1fr;
      gap:16px;
      align-items:start;
    }
    .card{
      background: rgba(255,255,255,.72);
      border: 1px solid rgba(20,35,55,.10);
      border-radius: var(--radius);
      padding: 18px;
      box-shadow: 0 18px 50px rgba(15, 23, 42, .05);
    }
    .card h2{
      margin: 0 0 10px 0;
      font-size: 16px;
      letter-spacing:-.01em;
    }
    .toc{
      display:flex; flex-wrap:wrap; gap:10px;
      margin-top: 8px;
    }
    .toc a{
      display:inline-flex; align-items:center; gap:8px;
      padding: 10px 12px;
      border-radius: 14px;
      border: 1px solid rgba(20,35,55,.10);
      background: rgba(255,255,255,.68);
      color: var(--muted);
      font-weight:800;
      font-size:13px;
      transition: transform .15s ease, background .15s ease, color .15s ease;
    }
    .toc a:hover{
      transform: translateY(-2px);
      color: var(--text);
      text-decoration:none;
      background: rgba(255,255,255,.86);
    }
    .toc a i{
      width:18px; height:18px;
      border-radius: 8px;
      display:inline-flex; align-items:center; justify-content:center;
      font-style:normal;
      color:#0a3a5a;
      background: rgba(14,165,233,.12);
      border: 1px solid rgba(14,165,233,.22);
      font-weight:900;
      font-size:12px;
    }

    .steps{
      display:flex; flex-direction:column; gap:10px;
      margin-top: 10px;
    }
    .step{
      padding: 14px;
      border-radius: 16px;
      border: 1px solid rgba(20,35,55,.10);
      background: rgba(255,255,255,.66);
      display:flex; gap:12px;
      align-items:flex-start;
    }
    .step .num{
      width:34px; height:34px;
      border-radius: 14px;
      background: linear-gradient(135deg, rgba(14,165,233,.20), rgba(124,58,237,.16));
      border: 1px solid rgba(20,35,55,.10);
      display:flex; align-items:center; justify-content:center;
      font-weight:1000;
      color:#0a3a5a;
      flex:0 0 auto;
    }
    .step b{display:block; font-size:13px; margin-top:1px}
    .step p{margin:4px 0 0 0; color:var(--muted); font-size:13px; line-height:1.6}

    .grid-3{
      display:grid;
      grid-template-columns: repeat(3, 1fr);
      gap:12px;
      margin-top: 12px;
    }
    .mini{
      padding: 14px;
      border-radius: 16px;
      border: 1px solid rgba(20,35,55,.10);
      background: rgba(255,255,255,.66);
      transition: transform .15s ease, box-shadow .15s ease;
      position:relative;
      overflow:hidden;
    }
    .mini:hover{
      transform: translateY(-2px);
      box-shadow: 0 16px 35px rgba(15, 23, 42, .10);
    }
    .mini:before{
      content:"";
      position:absolute; inset:-1px;
      background:
        radial-gradient(260px 80px at 0% 0%, rgba(14,165,233,.18), rgba(14,165,233,0) 55%),
        radial-gradient(220px 90px at 100% 0%, rgba(124,58,237,.14), rgba(124,58,237,0) 58%);
      opacity:.55; pointer-events:none;
    }
    .mini > *{position:relative}
    .mini h3{
      margin:0 0 8px 0;
      font-size:14px;
    }
    .mini ul{
      margin:0; padding-left: 18px;
      color: var(--muted);
      font-size:13px;
      line-height:1.7;
    }
    .mini li{margin: 3px 0}

    .faq{
      margin-top: 12px;
      display:flex; flex-direction:column; gap:10px;
    }
    details{
      background: rgba(255,255,255,.68);
      border: 1px solid rgba(20,35,55,.10);
      border-radius: 16px;
      padding: 12px 14px;
      transition: box-shadow .15s ease, transform .15s ease;
    }
    details[open]{box-shadow: 0 16px 40px rgba(15, 23, 42, .10); transform: translateY(-1px)}
    summary{
      cursor:pointer;
      list-style:none;
      display:flex; align-items:center; justify-content:space-between; gap:12px;
      font-weight:950;
      font-size:14px;
      color: var(--text);
    }
    summary::-webkit-details-marker{display:none}
    .sum-right{
      display:flex; align-items:center; gap:10px;
      color:var(--muted);
      font-weight:900;
      font-size:12px;
    }
    .chev{
      width:30px; height:30px;
      border-radius: 14px;
      border: 1px solid rgba(20,35,55,.10);
      background: rgba(255,255,255,.75);
      display:flex; align-items:center; justify-content:center;
      transition: transform .18s ease;
    }
    details[open] .chev{transform: rotate(180deg)}
    .faq p{
      margin: 10px 0 0 0;
      color:var(--muted);
      font-size:13px;
      line-height:1.75;
    }

    .footer{
      background: #0b1220;
      color: #e8eef6;
      border-top: 1px solid rgba(255,255,255,.10);
      margin-top: 14px;
    }
    .footer .container{padding: 18px 0}
    .foot-grid{
      display:grid;
      grid-template-columns: 1.2fr .8fr;
      gap:14px;
      align-items:start;
    }
    .foot-title{
      display:flex; align-items:center; gap:12px;
    }
    .foot-logo{
      width:40px; height:40px; border-radius:14px;
      background: linear-gradient(135deg, rgba(14,165,233,.95), rgba(124,58,237,.95));
      display:flex; align-items:center; justify-content:center;
      font-weight:1000; color:#fff;
      box-shadow: 0 18px 50px rgba(124,58,237,.25);
    }
    .foot-title b{display:block; font-size:14px}
    .foot-title span{display:block; font-size:12px; color: rgba(232,238,246,.72); margin-top:3px}
    .foot-links{
      display:flex; flex-wrap:wrap; gap:10px;
      justify-content:flex-end;
    }
    .foot-links a{
      color: rgba(232,238,246,.78);
      border:1px solid rgba(255,255,255,.14);
      background: rgba(255,255,255,.06);
      padding:9px 12px;
      border-radius: 14px;
      font-weight:900;
      font-size:12px;
      transition: transform .15s ease, background .15s ease, color .15s ease, border-color .15s ease;
      text-decoration:none;
    }
    .foot-links a:hover{
      transform: translateY(-2px);
      color:#fff;
      background: rgba(255,255,255,.10);
      border-color: rgba(255,255,255,.22);
      text-decoration:none;
    }
    .copyright{
      margin-top: 14px;
      padding-top: 12px;
      border-top: 1px solid rgba(255,255,255,.10);
      color: rgba(232,238,246,.70);
      font-size:12px;
      display:flex; justify-content:space-between; gap:10px; flex-wrap:wrap;
    }

    .link-row{
      margin-top: 12px;
      display:flex; gap:10px; flex-wrap:wrap;
    }
    .text-link{
      display:inline-flex; align-items:center; gap:10px;
      padding: 10px 12px;
      border-radius: 14px;
      border: 1px solid rgba(20,35,55,.10);
      background: rgba(255,255,255,.68);
      color: var(--muted);
      font-weight:900;
      font-size:13px;
      transition: transform .15s ease, background .15s ease, color .15s ease;
    }
    .text-link:hover{transform: translateY(-2px); color: var(--text); background: rgba(255,255,255,.86); text-decoration:none}
    .text-link .arrow{
      width:26px; height:26px; border-radius:12px;
      display:flex; align-items:center; justify-content:center;
      border: 1px solid rgba(14,165,233,.22);
      background: rgba(14,165,233,.10);
      color:#0a3a5a;
      font-weight:1000;
    }

    .media-wrap{
      margin-top: 12px;
      display:flex;
      gap:14px;
      align-items:flex-start;
      flex-wrap:wrap;
    }
    .media{
      width: 220px;
      flex: 0 0 auto;
      border-radius: 18px;
      overflow:hidden;
      border: 1px solid rgba(20,35,55,.10);
      background: rgba(255,255,255,.68);
      box-shadow: 0 18px 50px rgba(15, 23, 42, .06);
    }
    .media img{
      width:100%;
      height:auto;
      display:block;
      object-fit:contain;
    }
    .media figcaption{
      padding: 10px 12px;
      color: var(--muted);
      font-weight:900;
      font-size:12px;
      border-top: 1px solid rgba(20,35,55,.10);
      background: rgba(255,255,255,.7);
    }
    .smalllist{
      margin: 0;
      padding-left: 18px;
      color: var(--muted);
      font-size:13px;
      line-height:1.8;
    }
    .smalllist li{margin: 4px 0}

    .up{
      position:fixed;
      right:16px;
      bottom:16px;
      z-index:80;
      width:46px; height:46px;
      border-radius: 18px;
      border: 1px solid rgba(20,35,55,.12);
      background: rgba(255,255,255,.72);
      box-shadow: 0 18px 50px rgba(15, 23, 42, .10);
      display:flex; align-items:center; justify-content:center;
      cursor:pointer;
      transition: transform .15s ease, opacity .15s ease;
      opacity:0;
      pointer-events:none;
    }
    .up.show{
      opacity:1;
      pointer-events:auto;
    }
    .up:focus{outline:none; box-shadow: var(--focus)}
    .up span{
      display:inline-block;
      transform: translateY(-2px);
      font-weight:1000;
      color:#0a3a5a;
    }
    @media (max-width: 920px){
      .hero-grid{grid-template-columns: 1fr; }
      .section-grid{grid-template-columns: 1fr}
      .grid-3{grid-template-columns: 1fr}
      .foot-grid{grid-template-columns: 1fr}
      .foot-links{justify-content:flex-start}
      .media{width:100%; max-width: 420px}
    }
    @media (max-width: 720px){
      .menu{display:none}
      .hamburger{display:flex}
      .nav-mobile.show{display:block}
      .nav{padding:12px 0}
      .hero-card{padding:18px}
      .card{padding:16px}
      .container{width: min(var(--container), calc(100% - 28px))}
      .btn{padding:10px 12px}
    }
    @media (prefers-reduced-motion: reduce){
      *{scroll-behavior:auto !important}
      .fact:hover,.mini:hover,.btn:hover,.toc a:hover,.text-link:hover,.up:hover{transform:none !important}
    }
    @keyframes floatIn{
      from{opacity:0; transform: translateY(10px)}
      to{opacity:1; transform: translateY(0)}
    }
    .reveal{animation: floatIn .55s ease both}
    @media (prefers-reduced-motion: reduce){
      .reveal{animation:none}
    }