:root{
      --theme:#0B3D91;
      --theme-dark:#082d6b;
      --ink:#172033;
      --muted:#687386;
      --line:#dce3ed;
      --paper:#f5f7fa;
      --white:#fff;
      --accent:#d99732;
      --shadow:0 18px 45px rgba(20,40,75,.10);
      --radius:8px;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{
      margin:0;
      color:var(--ink);
      background:var(--paper);
      font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Microsoft YaHei","Noto Sans CJK SC",sans-serif;
      line-height:1.7;
    }
    a{color:inherit;text-decoration:none}
    img{max-width:100%;display:block}
    button{font:inherit}
    .container{width:min(1180px,calc(100% - 40px));margin:0 auto}

    .topbar{
      color:#dbe7f8;
      background:#0e1b31;
      font-size:13px;
    }
    .topbar .container{
      min-height:36px;
      display:flex;
      align-items:center;
      justify-content:space-between;
      gap:20px;
    }
    .topbar a{margin-left:20px;color:#dbe7f8}
    .header{
      position:relative;
      z-index:20;
      background:var(--white);
      border-bottom:1px solid var(--line);
    }
    .header-inner{
      min-height:78px;
      display:flex;
      align-items:center;
      gap:28px;
    }
    .logo{
      display:flex;
      align-items:center;
      gap:10px;
      flex:none;
      color:var(--theme-dark);
      font-size:18px;
      font-weight:800;
      white-space:nowrap;
    }
    .logo img{width:34px;height:34px;object-fit:contain}
    .main-nav{margin-left:auto}
    .nav-list{
      display:flex;
      align-items:center;
      gap:4px;
      list-style:none;
      padding:0;
      margin:0;
    }
    .nav-item{position:relative}
    .nav-link{
      display:flex;
      align-items:center;
      min-height:78px;
      padding:0 13px;
      color:#344054;
      font-size:14px;
      white-space:nowrap;
    }
    .nav-link:hover,.nav-link:focus-visible{color:var(--theme)}
    .has-arrow:after{
      content:"";
      width:6px;
      height:6px;
      margin:0 0 4px 8px;
      border-right:1px solid currentColor;
      border-bottom:1px solid currentColor;
      transform:rotate(45deg);
    }
    .dropdown-panel,.mega-menu{
      position:absolute;
      top:calc(100% - 1px);
      left:50%;
      width:300px;
      padding:20px;
      background:var(--white);
      border:1px solid var(--line);
      box-shadow:var(--shadow);
      opacity:0;
      visibility:hidden;
      transform:translate(-50%,8px);
      transition:.2s ease;
    }
    .mega-menu{width:620px}
    .nav-item:hover>.dropdown-panel,
    .nav-item:focus-within>.dropdown-panel,
    .nav-item:hover>.mega-menu,
    .nav-item:focus-within>.mega-menu{
      opacity:1;
      visibility:visible;
      transform:translate(-50%,0);
    }
    .dropdown-panel:before,.mega-menu:before{
      content:"";
      position:absolute;
      left:0;
      right:0;
      height:12px;
      top:-12px;
    }
    .drop-title,.mega-title{
      margin:0 0 12px;
      color:var(--theme-dark);
      font-size:13px;
      font-weight:800;
    }
    .drop-link{
      display:block;
      padding:8px 0;
      border-bottom:1px solid #edf0f5;
      color:#445168;
      font-size:13px;
    }
    .drop-link:hover{color:var(--theme)}
    .drop-link small{color:var(--muted)}
    .mega-grid{
      display:grid;
      grid-template-columns:repeat(2,minmax(0,1fr));
      gap:9px;
    }
    .mega-card{
      display:flex;
      gap:9px;
      min-width:0;
      padding:10px;
      background:#f7f9fc;
      border:1px solid #e7ebf2;
      border-radius:6px;
    }
    .mega-card:hover{border-color:#a9bddb}
    .mega-card img{
      width:30px;
      height:30px;
      flex:none;
      object-fit:contain;
    }
    .mega-card span{min-width:0}
    .mega-card strong{
      display:block;
      overflow:hidden;
      color:var(--ink);
      font-size:12px;
      text-overflow:ellipsis;
      white-space:nowrap;
    }
    .mega-card small{
      display:block;
      overflow:hidden;
      color:var(--muted);
      font-size:11px;
      text-overflow:ellipsis;
      white-space:nowrap;
    }
    .mega-footer{
      display:block;
      margin-top:15px;
      padding-top:12px;
      border-top:1px solid var(--line);
      color:var(--theme);
      font-size:13px;
      font-weight:700;
    }
    .header-btns{
      display:flex;
      align-items:center;
      gap:9px;
      flex:none;
    }
    .member-btn,.open-btn{
      display:inline-flex;
      align-items:center;
      justify-content:center;
      min-height:36px;
      padding:0 13px;
      border-radius:5px;
      font-size:13px;
      white-space:nowrap;
    }
    .member-btn{color:var(--theme);border:1px solid #afc1dc}
    .open-btn{color:#fff;background:var(--theme)}
    .member-btn:hover{background:#eef4fc}
    .open-btn:hover{background:var(--theme-dark)}
    .hamburger{
      display:none;
      width:40px;
      height:40px;
      padding:8px;
      border:1px solid var(--line);
      border-radius:5px;
      background:#fff;
      cursor:pointer;
    }
    .hamburger span{
      display:block;
      height:2px;
      margin:5px 0;
      background:var(--theme);
      transition:.2s;
    }
    .hamburger.active span:first-child{transform:translateY(7px) rotate(45deg)}
    .hamburger.active span:nth-child(2){opacity:0}
    .hamburger.active span:last-child{transform:translateY(-7px) rotate(-45deg)}

    .drawer-overlay{
      position:fixed;
      inset:0;
      z-index:40;
      background:rgba(10,22,42,.48);
      opacity:0;
      visibility:hidden;
      transition:.2s;
    }
    .drawer-overlay.open{opacity:1;visibility:visible}
    .mobile-drawer{
      position:fixed;
      top:0;
      right:0;
      bottom:0;
      z-index:50;
      width:min(390px,88vw);
      padding-bottom:25px;
      overflow:auto;
      background:#fff;
      box-shadow:-15px 0 40px rgba(10,25,50,.18);
      transform:translateX(100%);
      transition:.25s ease;
    }
    .mobile-drawer.open{transform:translateX(0)}
    .drawer-head{
      min-height:72px;
      display:flex;
      align-items:center;
      gap:12px;
      padding:15px 20px;
      color:var(--theme-dark);
      border-bottom:1px solid var(--line);
      font-weight:800;
    }
    .drawer-head>a{
      margin-left:auto;
      padding:5px 11px;
      color:#fff;
      background:var(--theme);
      border-radius:4px;
      font-size:13px;
    }
    .drawer-close{
      width:34px;
      height:34px;
      padding:0;
      border:1px solid var(--line);
      background:#fff;
      color:var(--muted);
      cursor:pointer;
      font-size:24px;
      line-height:1;
    }
    .drawer-menu{padding:8px 20px}
    .drawer-link,.drawer-toggle{
      display:flex;
      width:100%;
      align-items:center;
      justify-content:space-between;
      padding:13px 0;
      border:0;
      border-bottom:1px solid #edf0f4;
      background:none;
      color:var(--ink);
      text-align:left;
      cursor:pointer;
      font-size:15px;
    }
    .drawer-toggle:after{
      content:"+";
      color:var(--theme);
      font-size:20px;
    }
    .drawer-toggle.active:after{content:"−"}
    .drawer-submenu{
      display:none;
      padding:4px 0 8px 14px;
      border-bottom:1px solid #edf0f4;
    }
    .drawer-submenu.open{display:block}
    .drawer-submenu a{
      display:block;
      padding:7px 0;
      color:var(--muted);
      font-size:13px;
    }

    .tool-detail-page{
      padding:52px 0 80px;
    }
    .tool-breadcrumb{
      display:flex;
      flex-wrap:wrap;
      gap:8px;
      margin-bottom:22px;
      color:var(--muted);
      font-size:13px;
    }
    .tool-breadcrumb a{color:var(--theme)}
    .tool-layout{
      display:grid;
      grid-template-columns:minmax(0,1fr) 315px;
      gap:28px;
      align-items:start;
    }
    .tool-article,.tool-sidebar{
      min-width:0;
      border:1px solid var(--line);
      border-radius:var(--radius);
      background:#fff;
      box-shadow:0 8px 25px rgba(23,45,80,.05);
    }
    .tool-article{padding:34px}
    .tool-heading{
      display:flex;
      align-items:flex-start;
      gap:18px;
      padding-bottom:25px;
      border-bottom:1px solid var(--line);
    }
    .tool-icon{
      width:68px;
      height:68px;
      flex:none;
      padding:12px;
      object-fit:contain;
      border:1px solid #d8e2f0;
      border-radius:8px;
      background:#f3f7fd;
    }
    .tool-heading h1{
      margin:0 0 8px;
      color:#14284a;
      font-size:clamp(26px,4vw,38px);
      line-height:1.25;
    }
    .tool-intro{
      margin:0;
      color:var(--muted);
      font-size:15px;
    }
    .tool-meta{
      display:flex;
      flex-wrap:wrap;
      gap:16px;
      margin:22px 0 28px;
      color:var(--muted);
      font-size:13px;
    }
    .tool-meta strong{color:var(--ink)}
    .tool-content{
      min-width:0;
      max-width:100%;
      overflow-x:auto;
      color:#354154;
      font-size:15px;
    }
    .tool-content img,.tool-content video,.tool-content iframe{
      max-width:100%;
    }
    .tool-content table{
      width:100%;
      max-width:100%;
      border-collapse:collapse;
    }
    .tool-content th,.tool-content td{
      padding:10px;
      border:1px solid var(--line);
      text-align:left;
    }
    .tool-content h2,.tool-content h3{
      margin:30px 0 12px;
      color:var(--theme-dark);
      line-height:1.35;
    }
    .tool-content h2{font-size:24px}
    .tool-content h3{font-size:19px}
    .tool-content a{color:var(--theme);text-decoration:underline}
    .tool-sidebar{padding:23px}
    .tool-sidebar h2{
      margin:0 0 16px;
      padding-bottom:13px;
      border-bottom:2px solid var(--theme);
      color:var(--theme-dark);
      font-size:19px;
    }
    .related-tool{
      display:grid;
      grid-template-columns:42px minmax(0,1fr);
      gap:11px;
      padding:14px 0;
      border-bottom:1px solid #edf0f4;
    }
    .related-tool:last-child{border-bottom:0}
    .related-tool img{
      width:42px;
      height:42px;
      padding:6px;
      object-fit:contain;
      border:1px solid #e2e8f1;
      border-radius:6px;
      background:#f7f9fc;
    }
    .related-tool strong{
      display:block;
      margin-bottom:3px;
      overflow:hidden;
      color:var(--ink);
      font-size:14px;
      text-overflow:ellipsis;
      white-space:nowrap;
    }
    .related-tool p{
      display:-webkit-box;
      overflow:hidden;
      margin:0;
      color:var(--muted);
      font-size:12px;
      line-height:1.5;
      -webkit-box-orient:vertical;
      -webkit-line-clamp:2;
    }
    .tool-contact{
      margin-top:22px;
      padding:17px;
      background:#f3f7fd;
      border-left:3px solid var(--theme);
    }
    .tool-contact strong{display:block;color:var(--theme-dark);font-size:14px}
    .tool-contact p{margin:6px 0 0;color:var(--muted);font-size:13px}

    .footer{
      color:#cad5e6;
      background:#0e1b31;
    }
    .footer .container{padding-top:48px}
    .footer-grid{
      display:grid;
      grid-template-columns:1.4fr 1fr 1fr 1fr;
      gap:35px;
      padding-bottom:35px;
    }
    .footer h3,.footer h4{margin:0 0 15px;color:#fff}
    .footer h3{font-size:20px}
    .footer h4{font-size:14px}
    .footer p{margin:7px 0;color:#aebbd0;font-size:13px}
    .footer-grid a{
      display:block;
      width:max-content;
      max-width:100%;
      margin:7px 0;
      color:#aebbd0;
      font-size:13px;
    }
    .footer-grid a:hover{color:#fff}
    .footer-bottom{
      display:flex;
      justify-content:space-between;
      gap:20px;
      padding:18px 0;
      border-top:1px solid rgba(220,230,245,.16);
      color:#8e9db5;
      font-size:12px;
    }

    @media (max-width:900px){
      .main-nav{display:none}
      .hamburger{display:block}
      .tool-layout{grid-template-columns:1fr}
      .tool-sidebar{order:2}
    }
    @media (max-width:640px){
      .container{width:min(100% - 28px,1180px)}
      .topbar .container{display:block;padding:8px 0}
      .topbar .container>span{display:block}
      .topbar a{margin:0 14px 0 0}
      .header-inner{min-height:68px;gap:10px}
      .header-btns{margin-left:auto}
      .member-btn{display:none}
      .open-btn{padding:0 10px}
      .tool-detail-page{padding:30px 0 55px}
      .tool-article{padding:22px 18px}
      .tool-heading{gap:12px}
      .tool-icon{width:52px;height:52px;padding:8px}
      .tool-heading h1{font-size:26px}
      .tool-meta{gap:9px 15px}
      .footer-grid{grid-template-columns:1fr 1fr;gap:25px 18px}
      .footer-grid>div:first-child{grid-column:1/-1}
      .footer-bottom{display:block}
      .footer-bottom span{display:block;margin-top:5px}
    }