:root{
      --theme:#0B3D91;
      --theme-dark:#082d6b;
      --theme-light:#eaf1fb;
      --ink:#172033;
      --muted:#6b7689;
      --line:#e4e9f1;
      --surface:#ffffff;
      --soft:#f5f7fb;
      --shadow:0 16px 40px rgba(23,42,78,.08);
      --radius:16px;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{margin:0;color:var(--ink);background:#f7f9fc;font-family:"Microsoft YaHei","PingFang SC",Arial,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{height:38px;background:#10233f;color:#cbd7e8;font-size:13px}
    .topbar .container{height:100%;display:flex;align-items:center;justify-content:space-between}
    .topbar-links{display:flex;gap:22px}
    .topbar a{color:#dbe7f7;transition:color .2s}
    .topbar a:hover{color:#fff}
    .header{position:relative;z-index:20;background:#fff;border-bottom:1px solid var(--line)}
    .header-inner{min-height:76px;display:flex;align-items:center;gap:30px}
    .logo{display:flex;align-items:center;gap:10px;white-space:nowrap;color:var(--theme);font-size:19px;font-weight:800}
    .logo img{width:34px;height:34px;object-fit:contain}
    .main-nav{flex:1}
    .nav-list{display:flex;align-items:stretch;justify-content:center;gap:3px;list-style:none;padding:0;margin:0}
    .nav-item{position:relative}
    .nav-link{display:flex;align-items:center;height:76px;padding:0 15px;font-size:14px;color:#344157;white-space:nowrap}
    .nav-link:hover,.nav-link:focus{color:var(--theme)}
    .has-arrow:after{content:"";width:6px;height:6px;margin:0 0 3px 8px;border-right:1.5px solid currentColor;border-bottom:1.5px solid currentColor;transform:rotate(45deg)}
    .dropdown-panel,.mega-menu{position:absolute;top:calc(100% - 1px);left:50%;transform:translateX(-50%) translateY(8px);visibility:hidden;opacity:0;pointer-events:none;background:#fff;border:1px solid var(--line);border-radius:0 0 14px 14px;box-shadow:0 18px 40px rgba(25,45,80,.14);transition:.2s ease}
    .dropdown-panel{width:250px;padding:12px}
    .dropdown-panel a{display:block;padding:10px 12px;border-radius:8px;font-size:13px}
    .dropdown-panel a:hover{background:var(--theme-light);color:var(--theme)}
    .mega-menu{width:610px;padding:22px}
    .nav-item:hover>.dropdown-panel,.nav-item:focus-within>.dropdown-panel,.nav-item:hover>.mega-menu,.nav-item:focus-within>.mega-menu{visibility:visible;opacity:1;transform:translateX(-50%) translateY(0);pointer-events:auto}
    .nav-item:hover>.dropdown-panel:before,.nav-item:hover>.mega-menu:before{content:"";position:absolute;left:0;right:0;top:-14px;height:14px}
    .mega-title{margin:0 0 13px;color:var(--theme);font-size:14px;font-weight:700}
    .mega-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}
    .mega-card{display:block;min-height:62px;padding:11px 12px;border:1px solid var(--line);border-radius:10px;background:#fbfcfe;font-size:12px;color:var(--muted)}
    .mega-card strong{font-size:13px;color:var(--ink)}
    .mega-card img{display:inline-block;width:22px;height:22px;vertical-align:middle;margin-right:5px;object-fit:contain}
    .mega-card:hover{border-color:#a9c0e5;background:var(--theme-light)}
    .mega-footer{display:block;margin-top:16px;padding-top:14px;border-top:1px solid var(--line);color:var(--theme);font-size:13px;font-weight:700}
    .header-btns{display:flex;align-items:center;gap:10px;white-space:nowrap}
    .member-btn,.account-btn{padding:8px 13px;border-radius:7px;font-size:13px}
    .member-btn{color:var(--theme);border:1px solid #c8d7ee}
    .account-btn{color:#fff;background:var(--theme)}
    .member-btn:hover{background:var(--theme-light)}
    .account-btn:hover{background:var(--theme-dark)}
    .hamburger{display:none;width:40px;height:38px;padding:8px;border:1px solid var(--line);background:#fff;border-radius:7px;cursor:pointer}
    .hamburger span{display:block;width:21px;height:2px;margin:4px auto;background:var(--theme);transition:.2s}
    .hamburger.active span:nth-child(1){transform:translateY(6px) rotate(45deg)}
    .hamburger.active span:nth-child(2){opacity:0}
    .hamburger.active span:nth-child(3){transform:translateY(-6px) rotate(-45deg)}
    .drawer-overlay{position:fixed;inset:0;z-index:50;background:rgba(8,25,51,.48);opacity:0;visibility:hidden;transition:.25s}
    .drawer-overlay.open{opacity:1;visibility:visible}
    .mobile-drawer{position:fixed;z-index:51;top:0;right:0;width:min(360px,88%);height:100vh;background:#fff;transform:translateX(100%);transition:.3s;overflow:auto;box-shadow:-12px 0 35px rgba(0,0,0,.16)}
    .mobile-drawer.open{transform:translateX(0)}
    .drawer-head{display:flex;align-items:center;gap:12px;padding:20px;border-bottom:1px solid var(--line);color:var(--theme);font-weight:700}
    .drawer-head>a{margin-left:auto;color:var(--theme);font-size:13px}
    .drawer-close{border:0;background:transparent;font-size:28px;line-height:1;color:#68758a;cursor:pointer}
    .drawer-menu{padding:10px 20px 30px}
    .drawer-link,.drawer-toggle{display:block;width:100%;padding:13px 0;border:0;border-bottom:1px solid var(--line);background:transparent;text-align:left;color:var(--ink);font-size:15px;cursor:pointer}
    .drawer-toggle:after{content:"+";float:right;color:var(--theme);font-size:20px}
    .drawer-toggle.active:after{content:"−"}
    .drawer-submenu{max-height:0;overflow:hidden;transition:max-height .25s;background:#f7f9fc;border-radius:8px}
    .drawer-submenu.open{max-height:600px;margin:5px 0 8px}
    .drawer-submenu a{display:block;padding:8px 12px;color:var(--muted);font-size:13px}
    .drawer-submenu a:hover{color:var(--theme)}
    .footer{margin-top:70px;background:#10233f;color:#c3cee0}
    .footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1.2fr;gap:42px;padding:50px 0 40px}
    .footer h3{margin:0 0 14px;color:#fff;font-size:20px}
    .footer h4{margin:0 0 15px;color:#fff;font-size:15px}
    .footer p{margin:7px 0;font-size:13px;line-height:1.8}
    .footer-grid>div>a{display:block;margin:8px 0;color:#c3cee0;font-size:13px}
    .footer-grid>div>a:hover{color:#fff}
    .footer-bottom{display:flex;justify-content:space-between;gap:20px;padding:18px 0;border-top:1px solid rgba(255,255,255,.13);font-size:12px;color:#aebbd0}
    .tools-page{padding:58px 0 0}
    .tools-intro{text-align:center;max-width:760px;margin:0 auto 34px}
    .tools-kicker{display:inline-flex;align-items:center;gap:8px;padding:6px 12px;border-radius:99px;background:var(--theme-light);color:var(--theme);font-size:13px;font-weight:700}
    .tools-kicker:before{content:"";width:7px;height:7px;border-radius:50%;background:var(--theme)}
    .tools-intro h1{margin:16px 0 10px;color:#142849;font-size:clamp(30px,4vw,48px);line-height:1.2;letter-spacing:-1px}
    .tools-intro p{margin:0;color:var(--muted);font-size:15px}
    .tools-toolbar{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-bottom:22px;padding:15px 18px;background:#fff;border:1px solid var(--line);border-radius:12px}
    .tools-toolbar strong{font-size:16px;color:#1c3153}
    .tools-toolbar span{font-size:13px;color:var(--muted)}
    .tools-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}
    .tool-card{display:flex;flex-direction:column;min-height:245px;padding:22px;background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:0 8px 24px rgba(28,55,96,.045);transition:transform .2s,box-shadow .2s,border-color .2s}
    .tool-card:hover{transform:translateY(-4px);border-color:#a8bee1;box-shadow:var(--shadow)}
    .tool-card-head{display:flex;align-items:center;gap:13px;margin-bottom:14px}
    .tool-icon{display:flex;align-items:center;justify-content:center;width:48px;height:48px;border-radius:12px;background:var(--theme-light);overflow:hidden;flex:none}
    .tool-icon img{width:30px;height:30px;object-fit:contain}
    .tool-card h2{margin:0;color:#17335f;font-size:18px;line-height:1.35}
    .tool-card p{margin:0;color:var(--muted);font-size:14px;line-height:1.75}
    .tool-card-foot{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-top:auto;padding-top:17px}
    .tool-more{color:var(--theme);font-size:13px;font-weight:700}
    .tool-more:after{content:" →";transition:.2s}
    .tool-card:hover .tool-more:after{margin-left:4px}
    .tool-type{padding:4px 8px;border-radius:5px;background:#f1f4f8;color:#758198;font-size:11px}
    .tools-note{display:flex;align-items:flex-start;gap:12px;margin-top:28px;padding:18px 20px;border:1px solid #d7e3f4;border-radius:12px;background:#f5f8fd;color:#5e6e86;font-size:13px}
    .tools-note b{color:var(--theme)}
    .pagination{display:flex;justify-content:center;gap:8px;margin:34px 0 0}
    .pagination a{min-width:34px;padding:6px 10px;text-align:center;border:1px solid var(--line);border-radius:7px;background:#fff;color:#657289;font-size:13px}
    .pagination a:hover,.pagination a.active{background:var(--theme);border-color:var(--theme);color:#fff}
    @media(max-width:1050px){
      .nav-link{padding:0 9px}
      .header-inner{gap:15px}
      .footer-grid{gap:25px}
    }
    @media(max-width:820px){
      .topbar{height:auto;padding:8px 0}
      .topbar .container{align-items:flex-start;gap:5px;flex-direction:column}
      .topbar-links{gap:12px;flex-wrap:wrap}
      .main-nav{display:none}
      .header-inner{min-height:68px}
      .hamburger{display:block}
      .member-btn{display:none}
      .footer-grid{grid-template-columns:repeat(2,1fr)}
      .tools-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
    }
    @media(max-width:560px){
      .container{width:min(100% - 28px,1180px)}
      .header-btns{margin-left:auto}
      .account-btn{padding:7px 10px}
      .tools-page{padding-top:38px}
      .tools-intro h1{font-size:32px}
      .tools-toolbar{align-items:flex-start;flex-direction:column}
      .tools-grid{grid-template-columns:1fr}
      .tool-card{min-height:220px}
      .footer-grid{grid-template-columns:1fr;gap:24px;padding:38px 0 30px}
      .footer-bottom{align-items:flex-start;flex-direction:column}
    }