:root{
      --theme:#0B3D91;
      --ink:#172033;
      --muted:#68758a;
      --line:#e5eaf2;
      --soft:#f5f8fc;
      --card:#fff;
      --accent:#ef9f38;
      --radius:16px;
      --shadow:0 14px 40px rgba(20,46,88,.09);
    }
    *{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:1.7}
    a{color:inherit;text-decoration:none}
    img{max-width:100%;display:block}
    button{font:inherit}
    .container{width:min(1180px,calc(100% - 40px));margin:auto}
    .topbar{background:#11294f;color:#dce8fb;font-size:13px}
    .topbar .container{height:38px;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:78px;display:flex;align-items:center;gap:32px}
    .logo{display:flex;align-items:center;gap:10px;min-width:190px;color:var(--theme);font-size:19px;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;list-style:none;margin:0;padding:0}
    .nav-item{position:relative}
    .nav-link{height:78px;padding:0 15px;display:flex;align-items:center;gap:7px;font-size:15px;white-space:nowrap}
    .nav-link:hover,.nav-link:focus-within{color:var(--theme);background:#f6f9ff}
    .has-arrow:after{content:"⌄";font-size:13px;color:#8190a5}
    .dropdown-panel,.mega-menu{position:absolute;top:calc(100% + 1px);left:50%;transform:translateX(-50%);width:330px;padding:20px;background:#fff;border:1px solid var(--line);border-radius:0 0 14px 14px;box-shadow:var(--shadow);opacity:0;visibility:hidden;pointer-events:none;transition:.2s}
    .mega-menu{width:560px}
    .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}
    .dropdown-panel:before,.mega-menu:before{content:"";position:absolute;top:-10px;left:0;right:0;height:10px}
    .drop-title,.mega-title{margin:0 0 13px;color:var(--theme);font-size:14px;font-weight:800}
    .drop-list,.mega-links{display:grid;gap:8px}
    .drop-list a,.mega-links a{display:block;padding:5px 0;color:#45536a;font-size:14px}
    .drop-list a:hover,.mega-links a:hover{color:var(--theme)}
    .mega-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px}
    .mega-card{display:flex;align-items:center;gap:9px;padding:10px;border:1px solid var(--line);border-radius:10px;background:#fbfcff}
    .mega-card:hover{border-color:#9eb5dd;background:#f1f6ff}
    .mega-card img{width:30px;height:30px;object-fit:contain;border-radius:6px}
    .mega-card span{min-width:0}
    .mega-card strong,.mega-card small{display:block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
    .mega-card strong{font-size:13px}.mega-card small{color:var(--muted);font-size:11px}
    .mega-columns{display:grid;grid-template-columns:1fr 1fr;gap:30px}
    .mega-footer{display:block;margin-top:16px;padding-top:12px;border-top:1px solid var(--line);font-size:13px;color:var(--theme);font-weight:700}
    .header-btns{display:flex;align-items:center;gap:13px;white-space:nowrap}
    .member-btn{padding:9px 15px;background:var(--theme);color:#fff;border-radius:8px;font-size:13px}
    .account-link{color:var(--theme);font-size:14px;font-weight:700}
    .hamburger{display:none;border:0;background:transparent;padding:8px;cursor:pointer}
    .hamburger span{display:block;width:24px;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{position:fixed;inset:0;background:rgba(8,22,46,.48);opacity:0;visibility:hidden;z-index:40;transition:.25s}
    .drawer-overlay.open{opacity:1;visibility:visible}
    .mobile-drawer{position:fixed;z-index:50;top:0;right:0;width:min(390px,88vw);height:100vh;overflow:auto;background:#fff;transform:translateX(100%);transition:.28s;box-shadow:-12px 0 35px rgba(0,0,0,.18)}
    .mobile-drawer.open{transform:translateX(0)}
    .drawer-head{display:flex;align-items:center;gap:14px;padding:20px;border-bottom:1px solid var(--line);color:var(--theme)}
    .drawer-head strong{margin-right:auto}
    .drawer-head a{font-size:14px}
    .drawer-close{border:0;background:transparent;font-size:28px;line-height:1;color:#6d7890;cursor:pointer}
    .drawer-menu{padding:10px 20px 30px}
    .drawer-link,.drawer-toggle{display:block;width:100%;padding:13px 0;border:0;border-bottom:1px solid #edf0f5;background:transparent;text-align:left;color:var(--ink);font-size:15px;cursor:pointer}
    .drawer-toggle:after{content:"＋";float:right;color:#8a96a8}
    .drawer-toggle.active{color:var(--theme)}
    .drawer-toggle.active:after{content:"－"}
    .drawer-submenu{display:none;padding:5px 0 8px 16px}
    .drawer-submenu.open{display:block}
    .drawer-submenu a{display:block;padding:7px 0;color:var(--muted);font-size:14px}
    .footer{margin-top:70px;padding:48px 0 20px;background:#11294f;color:#d9e4f3}
    .footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:35px}
    .footer-brand strong{display:block;color:#fff;font-size:20px;margin-bottom:12px}
    .footer p{margin:6px 0;color:#aebed4;font-size:13px}
    .footer h3{margin:0 0 13px;color:#fff;font-size:15px}
    .footer-grid>div:not(.footer-brand) a{display:block;margin:7px 0;color:#b9c9de;font-size:13px}
    .footer-grid a:hover{color:#fff}
    .footer-bottom{display:flex;justify-content:space-between;gap:20px;margin-top:34px;padding-top:18px;border-top:1px solid rgba(255,255,255,.15);color:#9db0ca;font-size:12px}
    .tool-detail-page{padding:54px 0 0}
    .breadcrumb{margin-bottom:24px;color:#7c899b;font-size:13px}
    .breadcrumb a{color:var(--theme)}
    .tool-layout{display:grid;grid-template-columns:minmax(0,1fr) 310px;gap:28px;align-items:start}
    .tool-main,.tool-aside{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:0 8px 28px rgba(30,55,95,.05)}
    .tool-main{padding:34px}
    .tool-heading{display:flex;align-items:center;gap:18px;padding-bottom:23px;border-bottom:1px solid var(--line)}
    .tool-heading img{width:68px;height:68px;object-fit:contain;padding:10px;background:#eef4ff;border-radius:16px}
    .tool-heading h1{margin:0 0 5px;color:#172b52;font-size:30px;line-height:1.3}
    .tool-intro{margin:0;color:var(--muted);font-size:15px}
    .tool-meta{display:flex;flex-wrap:wrap;gap:12px;margin:22px 0}
    .tool-meta span{padding:6px 12px;border-radius:30px;background:#f1f5fb;color:#5e6d82;font-size:12px}
    .tool-meta strong{color:var(--theme)}
    .tool-content{min-width:0;max-width:100%;overflow-x:auto;color:#45536a;font-size:15px}
    .tool-content h2,.tool-content h3{color:#172b52;margin:28px 0 12px}
    .tool-content p{margin:12px 0}
    .tool-content img,.tool-content table{max-width:100%;height:auto}
    .tool-content table{border-collapse:collapse}
    .tool-content th,.tool-content td{padding:8px 12px;border:1px solid var(--line)}
    .tool-aside{padding:22px;position:sticky;top:20px}
    .tool-aside h2{margin:0 0 14px;font-size:18px;color:#172b52}
    .related-tool{display:flex;gap:11px;padding:13px 0;border-bottom:1px solid var(--line)}
    .related-tool:last-child{border-bottom:0}
    .related-tool img{width:40px;height:40px;object-fit:contain;background:#f0f4fb;border-radius:9px}
    .related-tool strong{display:block;font-size:14px;color:var(--theme)}
    .related-tool small{display:block;color:var(--muted);font-size:12px;line-height:1.5}
    .tool-actions{display:flex;gap:12px;margin-top:28px}
    .tool-actions a{padding:10px 18px;border-radius:8px;background:var(--theme);color:#fff;font-size:14px}
    .tool-actions a.secondary{background:#eef3fb;color:var(--theme)}
    @media(max-width:980px){
      .main-nav{display:none}
      .hamburger{display:block}
      .header-inner{height:68px}
      .header-btns{margin-left:auto}
      .tool-layout{grid-template-columns:1fr}
      .tool-aside{position:static}
    }
    @media(max-width:640px){
      .container{width:min(100% - 28px,1180px)}
      .topbar .container{height:auto;padding:8px 0;display:block}
      .topbar-links{gap:12px;margin-top:2px;flex-wrap:wrap}
      .logo{min-width:0;font-size:16px}
      .logo img{width:32px;height:32px}
      .account-link{display:none}
      .member-btn{padding:8px 10px}
      .tool-detail-page{padding-top:30px}
      .tool-main{padding:22px 18px}
      .tool-heading{align-items:flex-start}
      .tool-heading img{width:54px;height:54px}
      .tool-heading h1{font-size:24px}
      .footer-grid{grid-template-columns:1fr 1fr;gap:25px 18px}
      .footer-brand{grid-column:1/-1}
      .footer-bottom{display:block}
      .footer-bottom span{display:block;margin-top:5px}
    }