:root{
      --theme:#0B3D91;
      --ink:#142033;
      --muted:#68758a;
      --line:#dce4ef;
      --soft:#f4f7fb;
      --white:#fff;
      --shadow:0 18px 50px rgba(20,42,77,.1);
      --radius:18px;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{margin:0;color:var(--ink);background:#f7f9fc;font-family:"PingFang SC","Microsoft YaHei",Arial,sans-serif;line-height:1.7}
    a{color:inherit;text-decoration:none}
    img{max-width:100%;height:auto}
    button{font:inherit}
    .container{width:min(1180px,calc(100% - 40px));margin:0 auto}

    .topbar{background:#101a2b;color:#d8e1ef;font-size:13px}
    .topbar .container{min-height:38px;display:flex;align-items:center;justify-content:space-between;gap:20px}
    .topbar-links{display:flex;gap:20px}
    .topbar a{color:#d8e1ef;transition:color .2s}
    .topbar a:hover{color:#fff}

    .header{position:relative;z-index:20;background:#fff;border-bottom:1px solid #e8edf4}
    .header-inner{min-height:76px;display:flex;align-items:center;gap:30px}
    .logo{display:flex;align-items:center;gap:10px;min-width:max-content;font-size:19px;font-weight:800;color:#12213b}
    .logo img{width:34px;height:34px;object-fit:contain}
    .main-nav{margin-left:auto}
    .nav-list{display:flex;align-items:stretch;gap:4px;list-style:none;margin:0;padding:0}
    .nav-item{position:relative}
    .nav-link{display:flex;align-items:center;gap:5px;padding:26px 13px;font-size:14px;color:#27364e;white-space:nowrap}
    .nav-link:hover,.nav-link:focus{color:var(--theme)}
    .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);width:310px;padding:22px;background:#fff;border:1px solid #e5ebf3;border-radius:0 0 16px 16px;box-shadow:0 18px 40px rgba(19,35,61,.15);opacity:0;visibility:hidden;transition:.22s ease}
    .mega-menu{width:650px}
    .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:before,.mega-menu:before{content:"";position:absolute;left:0;right:0;top:-12px;height:12px}
    .dropdown-panel>a:not(.mega-footer){display:block;padding:9px 0;border-bottom:1px solid #edf1f6;font-size:14px}
    .mega-title{margin:0 0 14px;color:var(--theme);font-size:13px;font-weight:800;letter-spacing:.08em}
    .mega-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:10px}
    .mega-card{display:flex;flex-direction:column;gap:3px;padding:12px;border:1px solid #e6ecf3;border-radius:11px;transition:.2s;background:#fff}
    .mega-card:hover{border-color:var(--theme);transform:translateY(-2px)}
    .mega-card img{width:27px;height:27px;object-fit:contain;margin-bottom:3px}
    .mega-card strong{font-size:13px;line-height:1.4}
    .mega-card small{color:var(--muted);font-size:11px;line-height:1.5}
    .mega-footer{display:block;margin-top:16px;padding-top:13px;border-top:1px solid #e6ebf2;color:var(--theme);font-size:13px;font-weight:700}

    .header-btns{display:flex;align-items:center;gap:10px;white-space:nowrap}
    .member-btn{font-size:13px;color:#26364d}
    .open-account{padding:9px 16px;border-radius:8px;background:var(--theme);color:#fff;font-size:13px;font-weight:700}
    .hamburger{display:none;border:0;background:none;padding:8px;cursor:pointer}
    .hamburger span{display:block;width:23px;height:2px;margin:4px 0;background:#15243b;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;background:rgba(8,18,34,.45);opacity:0;visibility:hidden;z-index:50;transition:.25s}
    .drawer-overlay.open{opacity:1;visibility:visible}
    .mobile-drawer{position:fixed;top:0;right:0;width:min(390px,88vw);height:100vh;background:#fff;z-index:51;transform:translateX(100%);transition:transform .28s ease;overflow:auto;box-shadow:-12px 0 35px rgba(0,0,0,.15)}
    .mobile-drawer.open{transform:translateX(0)}
    .drawer-head{display:flex;align-items:center;gap:14px;padding:20px;border-bottom:1px solid var(--line);font-weight:700}
    .drawer-head>a{margin-left:auto;color:var(--theme);font-size:14px}
    .drawer-close{border:0;background:none;font-size:28px;line-height:1;color:#66748a;cursor:pointer}
    .drawer-menu{padding:12px 20px 40px}
    .drawer-link,.drawer-toggle{display:block;width:100%;padding:14px 0;border:0;border-bottom:1px solid #edf0f5;background:none;text-align:left;color:#213049;font-size:15px;cursor:pointer}
    .drawer-toggle:after{content:"+";float:right;color:var(--theme);font-size:20px;line-height:1}
    .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:#657187;font-size:13px}

    .tool-detail-page{padding:56px 0 80px}
    .tool-detail-page .breadcrumb{display:flex;align-items:center;gap:8px;margin-bottom:25px;color:#7b8798;font-size:13px}
    .tool-detail-page .breadcrumb a{color:var(--theme)}
    .tool-layout{display:grid;grid-template-columns:minmax(0,1fr) 310px;gap:28px;align-items:start}
    .tool-main-card,.tool-side-card{background:#fff;border:1px solid #e2e9f2;border-radius:var(--radius);box-shadow:var(--shadow)}
    .tool-main-card{padding:38px}
    .tool-heading{display:flex;align-items:flex-start;gap:20px;padding-bottom:26px;border-bottom:1px solid var(--line)}
    .tool-icon{width:76px;height:76px;flex:none;display:grid;place-items:center;border-radius:18px;background:#eef4ff;border:1px solid #d9e6fb;overflow:hidden}
    .tool-icon img{width:54px;height:54px;object-fit:contain}
    .tool-heading h1{margin:0 0 8px;font-size:30px;line-height:1.25;letter-spacing:-.03em}
    .tool-intro{margin:0;color:var(--muted);font-size:15px}
    .tool-meta{display:flex;flex-wrap:wrap;gap:10px 20px;margin-top:17px;color:#7c8796;font-size:12px}
    .tool-meta strong{color:#34435a;font-weight:600}
    .tool-content{min-width:0;max-width:100%;overflow-x:auto;padding-top:30px;color:#39485d;font-size:15px}
    .tool-content h2,.tool-content h3{color:#162741;line-height:1.35;margin:28px 0 12px}
    .tool-content h2{font-size:21px}
    .tool-content h3{font-size:17px}
    .tool-content p{margin:0 0 16px}
    .tool-content ul,.tool-content ol{padding-left:24px}
    .tool-content table{width:100%;min-width:560px;border-collapse:collapse;margin:18px 0}
    .tool-content th,.tool-content td{padding:11px 13px;border:1px solid var(--line);text-align:left}
    .tool-content th{background:#f1f5fb;color:#243955}
    .tool-content img{max-width:100%;height:auto}
    .tool-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:30px;padding-top:24px;border-top:1px solid var(--line)}
    .primary-action,.secondary-action{display:inline-flex;align-items:center;justify-content:center;padding:11px 19px;border-radius:9px;font-size:14px;font-weight:700}
    .primary-action{background:var(--theme);color:#fff}
    .secondary-action{background:#edf3fc;color:var(--theme)}

    .tool-side{display:grid;gap:18px}
    .tool-side-card{padding:23px}
    .tool-side-card h2{margin:0 0 16px;font-size:17px}
    .side-tool{display:grid;grid-template-columns:42px minmax(0,1fr);gap:11px;align-items:center;padding:12px 0;border-top:1px solid #edf1f5}
    .side-tool:first-of-type{border-top:0;padding-top:0}
    .side-tool img{width:40px;height:40px;object-fit:contain;border-radius:10px;background:#f0f4fa;padding:6px}
    .side-tool strong{display:block;font-size:13px;margin-bottom:3px}
    .side-tool small{display:block;color:var(--muted);font-size:11px;line-height:1.45}
    .tool-note{background:#10213a;color:#e3ebf7;border:0}
    .tool-note h2{color:#fff}
    .tool-note p{margin:0;color:#b9c8dc;font-size:13px}

    .footer{background:#101a2b;color:#d7e0ec;padding:52px 0 20px}
    .footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:34px}
    .footer-brand strong{display:block;color:#fff;font-size:20px;margin-bottom:12px}
    .footer p{margin:0 0 12px;color:#aebcd0;font-size:13px}
    .footer h3{margin:0 0 14px;color:#fff;font-size:14px}
    .footer-grid>div:not(.footer-brand) a{display:block;margin:7px 0;color:#aebcd0;font-size:13px}
    .footer-grid>div 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:#8797ae;font-size:12px}

    @media (max-width:980px){
      .main-nav{display:none}
      .header-btns{margin-left:auto}
      .hamburger{display:block}
      .tool-layout{grid-template-columns:1fr}
      .tool-side{grid-template-columns:repeat(2,minmax(0,1fr))}
      .tool-note{grid-column:span 2}
    }
    @media (max-width:640px){
      .container{width:min(100% - 28px,1180px)}
      .topbar .container{align-items:flex-start;flex-direction:column;gap:2px;padding:8px 0}
      .topbar-links{gap:12px;flex-wrap:wrap}
      .logo{font-size:16px}
      .member-btn{display:none}
      .open-account{padding:8px 12px}
      .tool-detail-page{padding:30px 0 55px}
      .tool-main-card{padding:22px 18px}
      .tool-heading{gap:13px}
      .tool-icon{width:58px;height:58px;border-radius:13px}
      .tool-icon img{width:42px;height:42px}
      .tool-heading h1{font-size:23px}
      .tool-intro{font-size:14px}
      .tool-side{grid-template-columns:1fr}
      .tool-note{grid-column:auto}
      .footer-grid{grid-template-columns:1fr 1fr;gap:26px 18px}
      .footer-brand{grid-column:span 2}
      .footer-bottom{display:block}
      .footer-bottom span{display:block;margin-top:7px}
    }