:root{--theme:#0B3D91;--ink:#132238;--muted:#68768a;--line:#e7ebf1;--bg:#f5f7fb;--card:#fff;--accent:#d99a27}
    *{box-sizing:border-box}html,body{margin:0;padding:0;color:var(--ink);font-family:Arial,"Microsoft YaHei","微软雅黑",sans-serif;background:var(--bg);line-height:1.7}
    a{color:inherit;text-decoration:none}img{max-width:100%;display:block}.container{width:min(1180px,calc(100% - 40px));margin:auto}
    .topbar{height:38px;background:#101c2c;color:#c8d3df;font-size:13px}.topbar .container{height:100%;display:flex;align-items:center;justify-content:space-between}.topbar strong{color:#fff}.topbar-links{display:flex;gap:22px}.topbar a:hover{color:#fff}
    .header{position:relative;z-index:20;background:#fff;border-bottom:1px solid var(--line);box-shadow:0 4px 18px #15263b0a}.header-inner{height:76px;display:flex;align-items:center;gap:34px}.logo{display:flex;align-items:center;gap:10px;min-width:188px;font-size:19px;font-weight:700;color:var(--theme)}.logo img{width:34px;height:34px;object-fit:contain}
    .main-nav{flex:1}.nav-list{display:flex;justify-content:center;align-items:center;gap:4px;padding:0;margin:0;list-style:none}.nav-item{position:relative}.nav-link{display:block;padding:25px 14px;font-size:15px;white-space:nowrap}.nav-link:hover,.nav-item:focus-within>.nav-link{color:var(--theme)}.has-arrow:after{content:"⌄";font-size:12px;margin-left:6px}
    .dropdown-panel,.mega-menu{position:absolute;top:calc(100% + 1px);left:50%;transform:translateX(-50%);width:290px;padding:20px;background:#fff;border:1px solid var(--line);border-radius:0 0 12px 12px;box-shadow:0 18px 38px #10243a18;opacity:0;visibility:hidden;transition:.2s;z-index:30}.mega-menu{width:650px}.nav-item:hover>.dropdown-panel,.nav-item:hover>.mega-menu,.nav-item:focus-within>.dropdown-panel,.nav-item:focus-within>.mega-menu{opacity:1;visibility:visible}.dropdown-panel:before,.mega-menu:before{content:"";position:absolute;top:-12px;left:0;right:0;height:12px}
    .mega-title{margin:0 0 12px;color:var(--theme);font-weight:700;font-size:14px}.dropdown-panel>a{display:block;padding:8px 0;border-bottom:1px solid var(--line);font-size:13px}.dropdown-panel>a:hover,.mega-card:hover{color:var(--theme)}
    .mega-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}.mega-card{display:flex;gap:8px;min-height:55px;padding:9px;border:1px solid var(--line);border-radius:8px;font-size:12px}.mega-card img{width:32px;height:32px;object-fit:contain;flex:0 0 32px}.mega-card span{min-width:0}.mega-card b,.mega-card small{display:block}.mega-card b{font-size:12px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.mega-card small{color:var(--muted);font-size:10px;line-height:1.45;margin-top:2px}.mega-footer{display:block;margin-top:14px;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:12px;white-space:nowrap}.member-link{font-size:13px;color:var(--theme)}.account-btn{padding:9px 15px;border-radius:6px;background:var(--theme);color:#fff;font-size:13px}.hamburger{display:none;border:0;background:transparent;padding:8px;cursor:pointer}.hamburger span{display:block;width:23px;height:2px;margin:4px;background:var(--ink);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{display:none}.mobile-drawer{display:none}
    .tool-detail-page{padding:54px 0 75px}.crumb{font-size:13px;color:var(--muted);margin-bottom:20px}.crumb a{color:var(--theme)}.tool-layout{display:grid;grid-template-columns:minmax(0,1fr) 310px;gap:26px;align-items:start}.tool-main,.tool-side{background:var(--card);border:1px solid var(--line);border-radius:16px;box-shadow:0 10px 30px #1a31500a}.tool-main{padding:34px}.tool-heading{display:flex;align-items:center;gap:20px;padding-bottom:25px;border-bottom:1px solid var(--line)}.tool-icon{width:82px;height:82px;border-radius:16px;background:#eef3fb;padding:14px;object-fit:contain}.tool-heading h1{margin:0 0 6px;font-size:30px;line-height:1.3}.tool-heading p{margin:0;color:var(--muted)}.tool-meta{display:flex;flex-wrap:wrap;gap:10px;margin:20px 0}.tool-meta span{padding:5px 11px;border-radius:20px;background:#f0f4f9;color:#607086;font-size:12px}.tool-meta strong{color:var(--theme)}.tool-content{min-width:0;max-width:100%;overflow-x:auto;padding-top:10px}.tool-content h2{font-size:21px;margin:25px 0 10px;color:var(--theme)}.tool-content h3{font-size:17px;margin:21px 0 8px}.tool-content p{margin:10px 0;color:#435166}.tool-content ul,.tool-content ol{padding-left:24px;color:#435166}.tool-content img,.tool-content table{max-width:100%}.tool-content table{border-collapse:collapse;width:100%;margin:15px 0}.tool-content th,.tool-content td{border:1px solid var(--line);padding:9px;text-align:left}.tool-content th{background:#f2f5fa}.tool-side{padding:22px;position:sticky;top:18px}.tool-side h2{font-size:18px;margin:0 0 14px}.side-tool{display:flex;gap:10px;padding:13px 0;border-bottom:1px solid var(--line)}.side-tool img{width:42px;height:42px;object-fit:contain;border-radius:8px;background:#f0f4f9}.side-tool b,.side-tool small{display:block}.side-tool b{font-size:14px}.side-tool small{color:var(--muted);font-size:12px;line-height:1.45}.tool-action{display:inline-block;margin-top:23px;padding:11px 20px;border-radius:7px;background:var(--theme);color:#fff;font-size:14px}
    .footer{background:#101c2c;color:#bdc9d5;padding:46px 0 20px}.footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:35px}.footer h3,.footer h4{color:#fff;margin:0 0 13px}.footer h3{font-size:20px}.footer h4{font-size:14px}.footer p{margin:6px 0;color:#91a0b0;font-size:13px}.footer a{display:block;margin:6px 0;font-size:13px}.footer a:hover{color:#fff}.footer-brand>a{color:#d4deea}.footer-bottom{display:flex;justify-content:space-between;border-top:1px solid #ffffff1a;margin-top:32px;padding-top:17px;color:#8292a3;font-size:12px}
    @media(max-width:900px){.main-nav{display:none}.header-inner{height:66px;justify-content:space-between}.header-btns{margin-left:auto}.member-link{display:none}.hamburger{display:block}.tool-layout{grid-template-columns:1fr}.tool-side{position:static}.footer-grid{grid-template-columns:repeat(2,1fr)}.mega-menu{width:min(650px,calc(100vw - 30px))}}
    @media(max-width:600px){.container{width:min(100% - 28px,1180px)}.topbar{height:auto;padding:7px 0}.topbar .container{display:block;font-size:11px}.topbar-links{gap:12px;margin-top:2px}.account-btn{display:none}.tool-detail-page{padding:30px 0 50px}.tool-main{padding:20px}.tool-heading{align-items:flex-start}.tool-icon{width:62px;height:62px;padding:10px}.tool-heading h1{font-size:23px}.footer{padding-top:32px}.footer-grid{grid-template-columns:1fr 1fr;gap:24px 18px}.footer-bottom{display:block}.footer-bottom span{display:block;margin-top:5px}
      .mobile-drawer{display:block;position:fixed;top:0;right:0;bottom:0;width:min(340px,88vw);background:#fff;z-index:50;transform:translateX(100%);transition:.25s;overflow:auto}.mobile-drawer.open{transform:translateX(0)}.drawer-overlay{display:block;position:fixed;inset:0;background:#07142499;z-index:40;opacity:0;visibility:hidden;transition:.25s}.drawer-overlay.open{opacity:1;visibility:visible}.drawer-head{display:flex;align-items:center;gap:13px;padding:18px;border-bottom:1px solid var(--line);font-weight:700;color:var(--theme)}.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:var(--muted);cursor:pointer}.drawer-menu{padding:8px 18px}.drawer-link,.drawer-toggle{display:block;width:100%;padding:13px 0;border:0;border-bottom:1px solid var(--line);background:transparent;text-align:left;font:inherit;color:var(--ink);cursor:pointer}.drawer-toggle:after{content:"＋";float:right;color:var(--muted)}.drawer-toggle.active:after{content:"－"}.drawer-submenu{display:none;padding:4px 0 7px 15px}.drawer-submenu.open{display:block}.drawer-submenu a{display:block;padding:7px 0;color:var(--muted);font-size:13px}
    }