:root{--theme:#0B3D91;--ink:#17233b;--muted:#68758b;--line:#e4e9f1;--soft:#f4f7fb;--white:#fff;--shadow:0 16px 42px rgba(15,44,88,.09)}
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{margin:0;color:var(--ink);background:#fff;font-family:"Microsoft YaHei","PingFang SC",Arial,sans-serif;line-height:1.65}
    a{color:inherit;text-decoration:none}
    button{font:inherit}
    .container{width:min(1180px,calc(100% - 40px));margin:0 auto}
    .topbar{height:36px;background:#f5f7fa;border-bottom:1px solid #e9edf3;color:#68758b;font-size:12px}
    .topbar .container{height:100%;display:flex;align-items:center;justify-content:space-between}
    .topbar-links{display:flex;gap:22px}
    .topbar a:hover{color:var(--theme)}
    .header{position:relative;z-index:20;background:#fff;border-bottom:1px solid var(--line)}
    .header-inner{height:76px;display:flex;align-items:center;gap:34px}
    .logo{display:flex;align-items:center;gap:10px;min-width:190px;font-size:19px;font-weight:800;color:var(--theme)}
    .logo img{width:36px;height:36px;object-fit:contain}
    .main-nav{flex:1}
    .nav-list{display:flex;align-items:center;justify-content:center;gap:4px;list-style:none;margin:0;padding:0}
    .nav-item{position:relative}
    .nav-link{display:block;padding:27px 15px;font-size:14px;white-space:nowrap}
    .nav-link:hover,.nav-item:focus-within>.nav-link{color:var(--theme)}
    .has-arrow:after{content:"";display:inline-block;width:6px;height:6px;margin:0 0 3px 8px;border-right:1px solid currentColor;border-bottom:1px solid currentColor;transform:rotate(45deg)}
    .dropdown-panel,.mega-menu{position:absolute;top:100%;left:50%;transform:translate(-50%,8px);opacity:0;visibility:hidden;pointer-events:none;background:#fff;border:1px solid var(--line);border-radius:0 0 12px 12px;box-shadow:var(--shadow);transition:.2s ease}
    .dropdown-panel{width:300px;padding:20px}
    .mega-menu{width:700px;padding:24px}
    .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;pointer-events:auto;transform:translate(-50%,0)}
    .dropdown-panel:before,.mega-menu:before{content:"";position:absolute;left:0;right:0;top:-12px;height:12px}
    .panel-title{margin:0 0 13px;font-size:14px;color:var(--theme)}
    .panel-list{display:grid;gap:9px}
    .panel-list a{display:flex;justify-content:space-between;gap:12px;font-size:13px}
    .panel-list a:hover,.mega-card:hover{color:var(--theme)}
    .panel-list small{color:var(--muted);font-size:11px}
    .mega-grid{display:grid;grid-template-columns:1.4fr .8fr;gap:28px}
    .mega-cards{display:grid;grid-template-columns:repeat(2,1fr);gap:10px}
    .mega-card{display:grid;gap:2px;padding:12px;border:1px solid var(--line);border-radius:8px;background:#fbfcfe}
    .mega-card img{width:26px;height:26px;object-fit:contain}
    .mega-card strong{font-size:13px}
    .mega-card small{font-size:11px;line-height:1.45;color:var(--muted)}
    .mega-footer{display:inline-block;margin-top:17px;color:var(--theme);font-size:13px;font-weight:700}
    .header-btns{display:flex;align-items:center;gap:10px;white-space:nowrap}
    .member-btn,.open-btn{padding:9px 14px;border-radius:5px;font-size:13px}
    .member-btn{color:var(--theme);border:1px solid #cbd7ea}
    .open-btn{background:var(--theme);color:#fff}
    .hamburger{display:none;width:40px;height:40px;padding:8px;border:1px solid var(--line);background:#fff;border-radius:5px;cursor:pointer}
    .hamburger span{display:block;height:2px;background:var(--theme);margin:5px 2px;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{display:none;position:fixed;z-index:30;inset:0;background:rgba(8,20,40,.45)}
    .drawer-overlay.open{display:block}
    .mobile-drawer{position:fixed;z-index:31;top:0;right:0;width:min(380px,88vw);height:100vh;overflow:auto;background:#fff;transform:translateX(100%);transition:.25s ease;box-shadow:-12px 0 35px rgba(0,0,0,.12)}
    .mobile-drawer.open{transform:translateX(0)}
    .drawer-head{display:flex;align-items:center;gap:14px;padding:18px 20px;border-bottom:1px solid var(--line);font-weight:700}
    .drawer-head span{flex:1}
    .drawer-head a{padding:6px 12px;background:var(--theme);color:#fff;border-radius:4px;font-size:13px}
    .drawer-close{border:0;background:transparent;font-size:28px;line-height:1;color:var(--muted);cursor:pointer}
    .drawer-menu{padding:12px 20px 30px}
    .drawer-link,.drawer-toggle{display:block;width:100%;padding:14px 0;border:0;border-bottom:1px solid var(--line);background:none;text-align:left;color:var(--ink);cursor:pointer;font-size:15px}
    .drawer-toggle:after{content:"＋";float:right;color:var(--muted)}
    .drawer-toggle.active:after{content:"－"}
    .drawer-submenu{display:none;padding:4px 0 6px 16px;border-bottom:1px solid var(--line)}
    .drawer-submenu.open{display:block}
    .drawer-submenu a{display:block;padding:8px 0;color:var(--muted);font-size:13px}
    .tools-page{background:#f6f8fc;padding:64px 0 84px;min-height:620px}
    .tools-heading{text-align:center;max-width:760px;margin:0 auto 38px}
    .tools-heading .eyebrow{display:inline-block;margin-bottom:10px;color:var(--theme);font-size:12px;font-weight:800;letter-spacing:2px}
    .tools-heading h1{margin:0 0 12px;font-size:clamp(30px,4vw,48px);letter-spacing:-1px}
    .tools-heading p{margin:0;color:var(--muted);font-size:15px}
    .tool-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
    .tool-card{display:flex;flex-direction:column;min-height:245px;padding:24px;background:#fff;border:1px solid var(--line);border-radius:12px;box-shadow:0 8px 24px rgba(15,44,88,.045);transition:.2s ease}
    .tool-card:hover{transform:translateY(-4px);border-color:#b9c9e3;box-shadow:var(--shadow)}
    .tool-icon{display:flex;align-items:center;justify-content:center;width:52px;height:52px;margin-bottom:18px;border-radius:12px;background:#edf3fb;color:var(--theme);font-size:12px}
    .tool-icon img{width:34px;height:34px;object-fit:contain}
    .tool-card h2{margin:0 0 8px;font-size:19px}
    .tool-card p{display:-webkit-box;overflow:hidden;margin:0;color:var(--muted);font-size:13px;line-height:1.7;-webkit-box-orient:vertical;-webkit-line-clamp:3}
    .tool-meta{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-top:auto;padding-top:18px;color:#8994a5;font-size:12px}
    .tool-link{color:var(--theme);font-weight:700}
    .tool-link:after{content:" →"}
    .footer{background:#101c31;color:#c4cede;padding:52px 0 20px}
    .footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:38px}
    .footer-brand strong{display:block;margin-bottom:12px;color:#fff;font-size:19px}
    .footer p{margin:7px 0;color:#9eacc0;font-size:13px}
    .footer h3{margin:0 0 13px;color:#fff;font-size:14px}
    .footer-grid>div:not(.footer-brand) a{display:block;margin:7px 0;color:#aebbd0;font-size:13px}
    .footer-grid a:hover{color:#fff}
    .footer-bottom{display:flex;justify-content:space-between;gap:20px;margin-top:38px;padding-top:18px;border-top:1px solid rgba(255,255,255,.12);color:#8e9bb0;font-size:12px}
    @media(max-width:980px){
      .main-nav{display:none}.hamburger{display:block}.header-inner{justify-content:space-between}.header-btns{margin-left:auto}
      .tool-grid{grid-template-columns:repeat(2,1fr)}.footer-grid{grid-template-columns:repeat(2,1fr)}
    }
    @media(max-width:600px){
      .container{width:min(100% - 28px,1180px)}.topbar{height:auto;padding:8px 0}.topbar .container{align-items:flex-start;gap:4px;flex-direction:column}.topbar-links{gap:12px}
      .header-inner{height:66px;gap:8px}.logo{min-width:0;font-size:16px}.logo img{width:31px;height:31px}.member-btn{display:none}.open-btn{padding:8px 10px}
      .tools-page{padding:43px 0 60px}.tools-heading{margin-bottom:28px}.tools-heading h1{font-size:32px}.tool-grid{grid-template-columns:1fr}.tool-card{min-height:220px}
      .footer-grid{grid-template-columns:1fr 1fr;gap:25px 18px}.footer-bottom{display:block}.footer-bottom span{display:block;margin-top:7px}
      .mega-menu,.dropdown-panel{display:none}
    }