:root{
      --theme:#0B3D91;
      --ink:#0d1b2a;
      --muted:#68778b;
      --line:#dfe7f0;
      --soft:#f4f7fb;
      --white:#fff;
      --accent:#20c7d9;
      --shadow:0 18px 45px rgba(17,45,80,.10);
      --radius:18px;
    }
    *{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:1.6}
    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{background:#07182e;color:#c8d5e5;font-size:13px}
    .topbar-inner{height:38px;display:flex;align-items:center;justify-content:space-between}
    .topbar-links{display:flex;gap:22px}
    .topbar a{color:#d6e4f5}
    .header{position:relative;z-index:20;background:#fff;border-bottom:1px solid #edf1f6}
    .header-inner{height:78px;display:flex;align-items:center;gap:34px}
    .logo{display:flex;align-items:center;gap:10px;min-width:190px;color:var(--theme);font-weight:800;font-size:19px;white-space:nowrap}
    .logo img{width:38px;height:38px;object-fit:contain}
    .main-nav{flex:1}
    .nav-list{display:flex;align-items:stretch;justify-content:center;gap:4px;padding:0;margin:0;list-style:none;height:78px}
    .nav-item{position:relative;display:flex;align-items:center}
    .nav-link{padding:28px 13px;font-size:14px;color:#26384e;white-space:nowrap}
    .nav-link:hover,.nav-link:focus{color:var(--theme)}
    .has-arrow:after{content:"";display:inline-block;width:6px;height:6px;border-right:1px solid currentColor;border-bottom:1px solid currentColor;transform:rotate(45deg);margin:0 0 3px 8px}
    .dropdown-panel,.mega-menu{position:absolute;top:100%;left:50%;transform:translateX(-50%);visibility:hidden;opacity:0;pointer-events:none;background:#fff;border:1px solid #e4ebf3;border-radius:0 0 16px 16px;box-shadow:var(--shadow);transition:.2s ease}
    .dropdown-panel{width:290px;padding:18px}
    .mega-menu{width:700px;padding:25px}
    .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;pointer-events:auto}
    .dropdown-title,.mega-heading{font-size:13px;font-weight:800;color:var(--theme);margin-bottom:12px}
    .dropdown-panel>a{display:block;padding:8px 0;border-bottom:1px solid #edf1f6;font-size:13px}
    .dropdown-panel>a:last-child{border:0;color:var(--theme);font-weight:700}
    .mega-grid{display:grid;grid-template-columns:1fr 1fr;gap:28px}
    .mega-list{display:grid;gap:8px}
    .mega-list>a{display:flex;align-items:center;gap:10px;padding:8px;border-radius:10px}
    .mega-list>a:hover{background:var(--soft)}
    .mega-list img{width:36px;height:36px;object-fit:cover;border-radius:8px;background:#edf2f8}
    .mega-item-title,.mega-item-meta{display:block}
    .mega-item-title{font-size:13px;font-weight:700}
    .mega-item-meta{font-size:11px;color:var(--muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:230px}
    .mega-categories{display:flex;flex-wrap:wrap;gap:8px}
    .mega-categories a,.mega-tools span{padding:6px 10px;background:#f1f5fa;border-radius:20px;color:#3c526b;font-size:12px}
    .mega-tools{display:flex;flex-wrap:wrap;gap:7px;margin:17px 0}
    .mega-footer{display:inline-block;margin-top:14px;color:var(--theme);font-size:13px;font-weight:700}
    .header-btns{display:flex;align-items:center;gap:10px}
    .member-link{font-size:13px;color:var(--theme);white-space:nowrap}
    .account-btn{background:var(--theme);color:#fff;border-radius:9px;padding:9px 14px;font-size:13px;white-space:nowrap}
    .hamburger{display:none;border:0;background:transparent;padding:8px;cursor:pointer}
    .hamburger span{display:block;width:23px;height:2px;margin:5px 0;background:var(--ink);transition:.2s}
    .hamburger.active span:nth-child(1){transform:translateY(7px) rotate(45deg)}
    .hamburger.active span:nth-child(2){opacity:0}
    .hamburger.active span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
    .drawer-overlay{display:none;position:fixed;inset:0;background:rgba(4,17,35,.54);z-index:40}
    .drawer-overlay.open{display:block}
    .mobile-drawer{position:fixed;top:0;right:0;width:min(360px,88vw);height:100vh;background:#fff;z-index:50;transform:translateX(100%);transition:.3s ease;overflow:auto;box-shadow:-12px 0 35px rgba(0,0,0,.14)}
    .mobile-drawer.open{transform:translateX(0)}
    .drawer-head{height:70px;display:flex;align-items:center;gap:15px;padding:0 20px;border-bottom:1px solid var(--line);font-weight:700}
    .drawer-head span{flex:1;color:var(--theme)}
    .drawer-head a{background:var(--theme);color:#fff;padding:6px 12px;border-radius:7px;font-size:13px}
    .drawer-close{border:0;background:transparent;font-size:29px;color:#708096;cursor:pointer}
    .drawer-menu{padding:12px 20px 30px}
    .drawer-link,.drawer-toggle{display:block;width:100%;padding:14px 0;text-align:left;border:0;border-bottom:1px solid #edf1f6;background:none;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:.25s ease;padding-left:15px}
    .drawer-submenu.open{max-height:600px;padding-top:5px;padding-bottom:5px}
    .drawer-submenu a{display:block;padding:8px 0;color:var(--muted);font-size:13px}
    .footer{background:#091a31;color:#aab9cb;padding:55px 0 20px}
    .footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:35px}
    .footer-brand img{width:40px;height:40px;object-fit:contain;margin-bottom:12px}
    .footer h3{margin:0 0 9px;color:#fff;font-size:18px}
    .footer h4{margin:0 0 14px;color:#fff;font-size:14px}
    .footer p{margin:0;max-width:280px;font-size:13px;line-height:1.8}
    .footer-links,.footer-contact{display:grid;gap:8px;font-size:13px}
    .footer-links a:hover{color:#fff}
    .footer-bottom{display:flex;justify-content:space-between;gap:20px;border-top:1px solid rgba(255,255,255,.12);margin-top:38px;padding-top:18px;font-size:12px}
    .tools-page{padding-bottom:82px}
    .tools-hero{position:relative;overflow:hidden;background:linear-gradient(135deg,#081c38,#0B3D91 56%,#087b99);color:#fff;padding:78px 0 86px}
    .tools-hero:before,.tools-hero:after{content:"";position:absolute;border:1px solid rgba(123,232,244,.28);border-radius:50%}
    .tools-hero:before{width:460px;height:460px;right:-120px;top:-220px}
    .tools-hero:after{width:300px;height:300px;left:-150px;bottom:-210px}
    .tools-hero .container{position:relative;z-index:1}
    .eyebrow{display:inline-flex;align-items:center;gap:8px;color:#8af0f1;font-size:13px;font-weight:700;letter-spacing:1px}
    .eyebrow:before{content:"";width:25px;height:2px;background:var(--accent)}
    .tools-hero h1{max-width:760px;margin:14px 0 14px;font-size:clamp(34px,5vw,58px);line-height:1.15;letter-spacing:-1px}
    .tools-hero p{max-width:650px;margin:0;color:#d5e8f6;font-size:16px}
    .hero-stats{display:flex;flex-wrap:wrap;gap:30px;margin-top:32px}
    .hero-stat strong{display:block;font-size:25px;color:#fff}
    .hero-stat span{font-size:12px;color:#b5d1e5}
    .tools-content{margin-top:-35px;position:relative;z-index:2}
    .tools-toolbar{display:flex;align-items:center;justify-content:space-between;gap:18px;background:#fff;border:1px solid var(--line);border-radius:16px;padding:16px 20px;box-shadow:var(--shadow)}
    .tools-toolbar h2{font-size:18px;margin:0}
    .tool-filters{display:flex;gap:8px;flex-wrap:wrap}
    .tool-filter{padding:7px 13px;border:1px solid var(--line);border-radius:20px;color:var(--muted);font-size:12px}
    .tool-filter.active{background:#eaf3ff;color:var(--theme);border-color:#b9d0f2;font-weight:700}
    .tools-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:24px}
    .tool-card{display:flex;flex-direction:column;min-height:265px;background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:24px;box-shadow:0 8px 25px rgba(19,48,80,.05);transition:.2s ease}
    .tool-card:hover{transform:translateY(-4px);box-shadow:var(--shadow);border-color:#b7cceb}
    .tool-icon{width:52px;height:52px;border-radius:14px;padding:10px;background:#eaf3ff;object-fit:contain;margin-bottom:17px}
    .tool-card h3{margin:0 0 8px;font-size:18px;color:#122a48}
    .tool-card p{margin:0;color:var(--muted);font-size:13px;line-height:1.8;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}
    .tool-card-bottom{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-top:auto;padding-top:20px}
    .tool-card-meta{color:#91a0b1;font-size:12px}
    .tool-enter{color:var(--theme);font-size:13px;font-weight:700}
    .tool-enter:after{content:" →"}
    .tools-note{display:flex;align-items:center;justify-content:space-between;gap:20px;margin-top:30px;padding:22px 25px;background:#eaf3ff;border:1px solid #cbdcf3;border-radius:15px}
    .tools-note strong{display:block;color:var(--theme);margin-bottom:4px}
    .tools-note span{font-size:13px;color:#536b86}
    .note-btn{background:var(--theme);color:#fff;padding:10px 17px;border-radius:8px;font-size:13px;white-space:nowrap}
    @media(max-width:1050px){
      .header-inner{gap:15px}.logo{min-width:160px}.nav-link{padding-left:8px;padding-right:8px}
      .mega-menu{width:650px}
    }
    @media(max-width:800px){
      .container{width:min(100% - 30px,600px)}
      .topbar-inner{height:auto;min-height:38px;padding:8px 0;align-items:flex-start;gap:8px}
      .topbar-links{gap:8px;flex-direction:column;text-align:right}
      .main-nav{display:none}.header-inner{height:68px}.header-btns{margin-left:auto}
      .member-link{display:none}.hamburger{display:block}
      .tools-hero{padding:58px 0 70px}.tools-hero h1{font-size:38px}
      .tools-grid{grid-template-columns:1fr 1fr}.tools-toolbar{align-items:flex-start;flex-direction:column}
      .footer-grid{grid-template-columns:1fr 1fr;gap:28px}
      .footer-bottom{flex-direction:column;gap:8px}
    }
    @media(max-width:520px){
      .tools-grid{grid-template-columns:1fr}.hero-stats{gap:18px}.tools-note{align-items:flex-start;flex-direction:column}
      .footer-grid{grid-template-columns:1fr}.account-btn{display:none}
    }