:root{
      --primary:#0B3D91;
      --primary-dark:#082d6c;
      --ink:#17243b;
      --muted:#68758b;
      --line:#e4e9f1;
      --soft:#f4f7fb;
      --card:#fff;
      --shadow:0 16px 42px rgba(16,42,82,.09);
      --radius:16px;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{margin:0;color:var(--ink);background:#f7f9fc;font-family:Arial,"Microsoft YaHei","PingFang SC",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{background:#10213d;color:#dbe6f8;font-size:13px}
    .topbar-inner{min-height:38px;display:flex;align-items:center;justify-content:space-between;gap:20px}
    .topbar-contact{display:flex;gap:20px}
    .topbar a:hover{color:#fff}
    .header{position:relative;z-index:20;background:#fff;border-bottom:1px solid var(--line)}
    .header-inner{height:78px;display:flex;align-items:center;gap:34px}
    .logo{display:flex;align-items:center;gap:10px;white-space:nowrap;font-weight:800;color:var(--primary);font-size:19px}
    .logo img{width:34px;height:34px;object-fit:contain}
    .main-nav{flex:1}
    .nav-list{display:flex;align-items:center;justify-content:center;gap:4px;padding:0;margin:0;list-style:none}
    .nav-item{position:relative}
    .nav-link{display:flex;align-items:center;gap:7px;padding:27px 13px;color:#273550;font-size:15px;white-space:nowrap}
    .nav-link:hover,.nav-link.active{color:var(--primary)}
    .has-arrow:after{content:"";width:6px;height:6px;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%;transform:translateX(-50%) translateY(8px);opacity:0;visibility:hidden;transition:.2s ease;background:#fff;border:1px solid var(--line);box-shadow:var(--shadow);border-radius:0 0 14px 14px;padding:20px;z-index:30}
    .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:translateX(-50%) translateY(0)}
    .dropdown-panel{width:260px}
    .dropdown-panel a{display:block;padding:9px 10px;border-bottom:1px solid #eef1f6;font-size:14px}
    .dropdown-panel a:last-child{color:var(--primary);font-weight:700;border:0}
    .mega-menu{width:410px}
    .mega-menu-wide{width:min(780px,calc(100vw - 40px))}
    .mega-head{display:flex;align-items:baseline;justify-content:space-between;gap:16px;padding-bottom:14px;border-bottom:1px solid var(--line);margin-bottom:14px}
    .mega-head strong{font-size:16px;color:var(--primary)}
    .mega-head span{font-size:12px;color:var(--muted)}
    .mega-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:10px}
    .mega-card{display:flex;gap:10px;padding:10px;border:1px solid #edf0f5;border-radius:10px;background:#fbfcfe}
    .mega-card:hover{border-color:#b9cbe9;background:#f5f8fe}
    .mega-card>img{width:40px;height:40px;object-fit:cover;border-radius:8px;flex:none}
    .mega-card-body{min-width:0}
    .mega-card-body strong,.mega-card-body p,.mega-card-body small{display:block;overflow:hidden;text-overflow:ellipsis}
    .mega-card-body strong{font-size:13px;white-space:nowrap}
    .mega-card-body p{font-size:12px;color:var(--muted);margin:2px 0;white-space:nowrap}
    .mega-card-body small{font-size:11px;color:#7c8797;white-space:nowrap}
    .mega-category-list{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:14px}
    .mega-category-list a{padding:5px 10px;border-radius:20px;background:#eef4fd;color:var(--primary);font-size:12px}
    .mega-footer{display:block;text-align:center;margin-top:15px;padding-top:13px;border-top:1px solid var(--line);font-size:13px;color:var(--primary);font-weight:700}
    .header-btns{display:flex;align-items:center;gap:13px;white-space:nowrap}
    .member-entry{font-size:14px;color:var(--primary);font-weight:700}
    .account-entry{padding:9px 16px;border-radius:8px;background:var(--primary);color:#fff;font-size:14px}
    .account-entry:hover{background:var(--primary-dark)}
    .hamburger{display:none;width:40px;height:40px;border:1px solid var(--line);border-radius:8px;background:#fff;padding:8px;cursor:pointer}
    .hamburger span{display:block;height:2px;background:var(--primary);margin:5px 2px;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(8,25,52,.45);z-index:50}
    .drawer-overlay.open{display:block}
    .mobile-drawer{position:fixed;top:0;right:0;bottom:0;width:min(380px,88vw);background:#fff;z-index:60;transform:translateX(100%);transition:transform .25s ease;overflow:auto}
    .mobile-drawer.open{transform:translateX(0)}
    .drawer-head{height:68px;padding:0 20px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line);color:var(--primary);font-weight:700}
    .drawer-head a{margin-left:auto;margin-right:16px;padding:6px 12px;border-radius:6px;background:var(--primary);color:#fff;font-size:13px}
    .drawer-close{border:0;background:none;color:#6a7484;font-size:28px;cursor:pointer}
    .drawer-menu{padding:12px 20px 30px}
    .drawer-link,.drawer-toggle{display:block;width:100%;padding:13px 0;border:0;border-bottom:1px solid #edf0f5;background:none;text-align:left;color:var(--ink);font-size:15px;cursor:pointer}
    .drawer-toggle:after{content:"＋";float:right;color:var(--muted)}
    .drawer-toggle.active:after{content:"－"}
    .drawer-submenu{display:none;padding:4px 0 8px 15px}
    .drawer-submenu.open{display:block}
    .drawer-submenu a{display:block;padding:8px 0;color:var(--muted);font-size:14px}
    .footer{margin-top:70px;background:#101e35;color:#b7c4d8}
    .footer-main{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:42px;padding:52px 0 42px}
    .footer .logo{color:#fff;margin-bottom:16px}
    .footer-brand p{max-width:330px;margin:0 0 18px;color:#aab8ce;font-size:14px}
    .footer-social{font-size:13px;color:#d7e3f5}
    .footer-column h3{margin:0 0 16px;color:#fff;font-size:16px}
    .footer-links{display:grid;gap:9px;font-size:14px}
    .footer-links a:hover,.footer-contact a:hover{color:#fff}
    .footer-contact{display:grid;gap:14px;font-size:13px}
    .footer-contact span{color:#8191ab}
    .footer-bottom{display:flex;justify-content:space-between;gap:20px;padding:18px 0;border-top:1px solid rgba(255,255,255,.12);font-size:12px;color:#8191ab}
    .tool-detail-page{padding:42px 0 20px}
    .breadcrumb{display:flex;gap:8px;align-items:center;color:#7a879b;font-size:13px;margin-bottom:22px}
    .breadcrumb a{color:var(--primary)}
    .tool-layout{display:grid;grid-template-columns:minmax(0,1fr) 310px;gap:28px;align-items:start}
    .tool-article,.related-tools{background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:0 10px 28px rgba(23,46,84,.05)}
    .tool-article{padding:34px}
    .tool-kicker{display:inline-flex;padding:5px 12px;background:#eaf1fc;color:var(--primary);border-radius:20px;font-size:13px;font-weight:700}
    .tool-title{margin:14px 0 10px;font-size:clamp(28px,4vw,44px);line-height:1.2;color:#12284e}
    .tool-summary{margin:0 0 22px;color:var(--muted);font-size:17px}
    .tool-meta{display:flex;flex-wrap:wrap;gap:10px 22px;padding:15px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line);font-size:13px;color:#748196}
    .tool-icon{width:76px;height:76px;border-radius:18px;object-fit:cover;float:right;margin:0 0 15px 20px;border:1px solid var(--line)}
    .tool-body{min-width:0;max-width:100%;overflow-x:auto;padding-top:24px;color:#34435b}
    .tool-body h2,.tool-body h3{color:#172f59;margin:26px 0 10px}
    .tool-body p{margin:10px 0}
    .tool-body img,.tool-body table{max-width:100%}
    .tool-body table{border-collapse:collapse}
    .tool-body th,.tool-body td{border:1px solid var(--line);padding:8px 12px}
    .tool-body a{color:var(--primary);text-decoration:underline}
    .related-tools{padding:22px;position:sticky;top:20px}
    .related-tools h2{margin:0 0 16px;font-size:19px;color:#172f59}
    .related-item{display:flex;gap:11px;padding:13px 0;border-bottom:1px solid #edf0f5}
    .related-item:last-child{border-bottom:0}
    .related-item img{width:42px;height:42px;border-radius:9px;object-fit:cover;flex:none}
    .related-item strong{display:block;font-size:14px;color:#243957}
    .related-item p{margin:2px 0 0;color:#78859a;font-size:12px;line-height:1.5}
    .related-more{display:block;margin-top:14px;color:var(--primary);font-size:13px;font-weight:700}
    @media(max-width:1050px){
      .header-inner{gap:14px}.nav-link{padding-left:8px;padding-right:8px;font-size:14px}
      .member-entry{display:none}
    }
    @media(max-width:820px){
      .topbar-inner{padding:8px 0;align-items:flex-start}.topbar-contact{gap:10px;flex-direction:column;text-align:right}
      .main-nav{display:none}.hamburger{display:block}.account-entry{display:none}
      .header-inner{height:68px}.footer-main{grid-template-columns:repeat(2,1fr);gap:28px}
      .tool-layout{grid-template-columns:1fr}.related-tools{position:static}
    }
    @media(max-width:560px){
      .container{width:min(100% - 28px,1180px)}
      .topbar{font-size:11px}.topbar-contact{font-size:11px}
      .mega-grid{grid-template-columns:1fr}.footer-main{grid-template-columns:1fr;padding:38px 0 30px}
      .footer-bottom{display:block}.footer-bottom span{display:block;margin:5px 0}
      .tool-detail-page{padding-top:25px}.tool-article{padding:22px 18px}
      .tool-icon{float:none;margin:0 0 14px;width:64px;height:64px}
      .tool-title{font-size:30px}.tool-summary{font-size:15px}
    }