:root{--theme:#0B3D91;--ink:#101827;--muted:#64748b;--line:#e2e8f0;--soft:#f5f8fc;--white:#fff;--accent:#38bdf8}
    *{box-sizing:border-box}
    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}
    .container{width:min(1180px,calc(100% - 40px));margin:0 auto}
    .topbar{background:#07152d;color:#c9d8f0;font-size:13px}
    .topbar .container{min-height:36px;display:flex;align-items:center;justify-content:space-between}
    .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)}
    .header-inner{height:76px;display:flex;align-items:center;gap:36px}
    .logo{display:flex;align-items:center;gap:10px;flex-shrink:0;color:var(--theme);font-size:20px;font-weight:800}
    .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;margin:0;padding:0;list-style:none}
    .nav-item{position:relative}
    .nav-link{display:flex;align-items:center;height:76px;padding:0 14px;color:#334155;font-size:15px;font-weight:600;white-space:nowrap}
    .nav-link:hover,.nav-link:focus{color:var(--theme)}
    .has-arrow:after{content:"";width:6px;height:6px;margin-left:8px;border-right:1px solid currentColor;border-bottom:1px solid currentColor;transform:rotate(45deg) translateY(-2px)}
    .dropdown-panel,.mega-menu{position:absolute;top:calc(100% + 1px);left:50%;z-index:30;width:270px;padding:16px;background:#fff;border:1px solid var(--line);border-radius:0 0 14px 14px;box-shadow:0 18px 40px rgba(15,23,42,.14);opacity:0;visibility:hidden;transform:translate(-50%,8px);transition:.2s}
    .dropdown-panel:before,.mega-menu:before{content:"";position:absolute;left:0;right:0;top:-10px;height:10px}
    .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 a{display:block;padding:9px 8px;border-bottom:1px solid #eef2f7;color:#475569;font-size:14px}
    .dropdown-panel a:last-child{border-bottom:0}
    .dropdown-panel a:hover{color:var(--theme);background:#f8fbff}
    .mega-menu{width:690px;padding:20px}
    .mega-heading{display:flex;align-items:baseline;justify-content:space-between;margin-bottom:14px}
    .mega-heading strong{color:var(--theme);font-size:16px}
    .mega-heading span{color:var(--muted);font-size:12px}
    .mega-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}
    .mega-card{min-height:116px;padding:11px;border:1px solid var(--line);border-radius:10px;background:#fbfdff}
    .mega-card:hover{border-color:#9ec8ef;background:#f1f8ff}
    .mega-card img{width:30px;height:30px;object-fit:contain;margin-bottom:7px}
    .mega-card strong{display:block;font-size:13px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
    .mega-card small{display:block;margin-top:3px;color:var(--muted);font-size:11px;line-height:1.4}
    .mega-footer{display:flex;flex-wrap:wrap;gap:12px;margin-top:15px;padding-top:13px;border-top:1px solid var(--line);color:var(--theme);font-size:13px}
    .header-btns{display:flex;align-items:center;gap:12px;white-space:nowrap}
    .member-link{color:var(--theme);font-size:14px;font-weight:700}
    .account-link{padding:8px 15px;border-radius:7px;background:var(--theme);color:#fff;font-size:13px}
    .hamburger{display:none;width:40px;height:38px;padding:8px;border:1px solid var(--line);border-radius:7px;background:#fff;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:40;background:rgba(2,12,28,.54);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(360px,88vw);overflow:auto;background:#fff;transform:translateX(100%);transition:.25s}
    .mobile-drawer.open{transform:translateX(0)}
    .drawer-head{display:flex;align-items:center;gap:16px;padding:20px;border-bottom:1px solid var(--line)}
    .drawer-head strong{flex:1;color:var(--theme)}
    .drawer-head a{padding:7px 12px;border-radius:6px;background:var(--theme);color:#fff;font-size:13px}
    .drawer-close{border:0;background:none;color:#64748b;font-size:28px;line-height:1;cursor:pointer}
    .drawer-menu{padding:10px 20px 30px}
    .drawer-link,.drawer-toggle{display:block;width:100%;padding:14px 0;border:0;border-bottom:1px solid #edf1f6;background:none;color:#25344d;text-align:left;font:inherit;cursor:pointer}
    .drawer-toggle:after{content:"+";float:right;color:var(--theme);font-size:20px}
    .drawer-toggle.active:after{content:"−"}
    .drawer-submenu{display:none;padding:5px 0 8px 14px}
    .drawer-submenu.open{display:block}
    .drawer-submenu a{display:block;padding:8px 0;color:var(--muted);font-size:14px}
    .footer{margin-top:70px;background:#07152d;color:#b8c7dc}
    .footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1.3fr;gap:42px;padding:52px 0 40px}
    .footer-brand strong{color:#fff;font-size:20px}
    .footer-brand p{margin:12px 0 0;font-size:13px;line-height:1.8}
    .footer h3{margin:0 0 13px;color:#fff;font-size:15px}
    .footer-grid>div:not(.footer-brand) a,.footer-grid>div:not(.footer-brand)>span{display:block;margin:7px 0;color:#b8c7dc;font-size:13px}
    .footer-grid a:hover{color:#fff}
    .footer-bottom{display:flex;justify-content:space-between;padding:18px 0;border-top:1px solid rgba(255,255,255,.12);font-size:12px}
    .tools-page{padding:72px 0 10px}
    .tools-hero{text-align:center;max-width:760px;margin:0 auto 42px}
    .eyebrow{display:inline-flex;align-items:center;gap:8px;padding:6px 12px;border:1px solid #c8daf1;border-radius:999px;background:#edf5ff;color:var(--theme);font-size:12px;font-weight:700;letter-spacing:.08em}
    .eyebrow:before{content:"";width:7px;height:7px;border-radius:50%;background:#38bdf8;box-shadow:0 0 0 4px #d7effc}
    .tools-hero h1{margin:18px 0 10px;color:#0b1d3b;font-size:clamp(32px,5vw,54px);line-height:1.15;letter-spacing:-.04em}
    .tools-hero p{margin:0;color:var(--muted);font-size:16px}
    .tools-toolbar{display:flex;align-items:center;justify-content:space-between;gap:18px;margin-bottom:22px;padding:14px 18px;border:1px solid var(--line);border-radius:12px;background:#fff}
    .tools-toolbar strong{font-size:17px}
    .tools-toolbar span{color:var(--muted);font-size:13px}
    .tools-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
    .tool-card{display:flex;flex-direction:column;min-height:260px;padding:24px;border:1px solid var(--line);border-radius:16px;background:#fff;box-shadow:0 8px 24px rgba(15,23,42,.04);transition:transform .2s,box-shadow .2s,border-color .2s}
    .tool-card:hover{transform:translateY(-4px);border-color:#a9cbed;box-shadow:0 16px 34px rgba(11,61,145,.12)}
    .tool-icon{display:flex;align-items:center;justify-content:center;width:52px;height:52px;margin-bottom:18px;border-radius:14px;background:#edf5ff;color:var(--theme);font-size:23px;font-weight:800}
    .tool-icon img{width:34px;height:34px;object-fit:contain}
    .tool-card h2{margin:0 0 8px;font-size:19px;line-height:1.35}
    .tool-card p{display:-webkit-box;overflow:hidden;margin:0;color:var(--muted);font-size:14px;line-height:1.7;-webkit-box-orient:vertical;-webkit-line-clamp:3}
    .tool-link{display:inline-flex;align-items:center;gap:7px;margin-top:auto;padding-top:20px;color:var(--theme);font-size:14px;font-weight:700}
    .tool-link:after{content:"→";font-size:18px}
    .tools-note{margin-top:28px;padding:18px 22px;border-left:3px solid var(--accent);border-radius:0 10px 10px 0;background:#eef8ff;color:#486174;font-size:13px}
    @media(max-width:1050px){.header-inner{gap:18px}.nav-link{padding:0 9px}.member-link{display:none}}
    @media(max-width:820px){.main-nav{display:none}.hamburger{display:block}.header-inner{height:68px}.nav-list{display:none}.tools-grid{grid-template-columns:repeat(2,1fr)}.footer-grid{grid-template-columns:repeat(2,1fr);gap:28px}.footer-brand{grid-column:1/-1}}
    @media(max-width:560px){.container{width:min(100% - 28px,1180px)}.topbar .container{align-items:flex-start;flex-direction:column;padding:8px 0;gap:2px}.topbar-links{gap:12px;flex-wrap:wrap}.account-link{display:none}.tools-page{padding:48px 0 0}.tools-hero{margin-bottom:30px}.tools-hero h1{font-size:36px}.tools-hero p{font-size:14px}.tools-toolbar{align-items:flex-start;flex-direction:column}.tools-grid{grid-template-columns:1fr;gap:14px}.tool-card{min-height:230px}.footer-grid{grid-template-columns:1fr;padding-top:38px}.footer-brand{grid-column:auto}.footer-bottom{align-items:flex-start;flex-direction:column;gap:6px}}