:root{
      --theme:#0B3D91;
      --ink:#161b2b;
      --muted:#667085;
      --line:#dfe4ee;
      --paper:#f5f7fb;
      --white:#ffffff;
      --accent:#b9f2e6;
      --dark:#10182c;
      --shadow:0 18px 50px rgba(16,24,40,.1);
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{margin:0;background:var(--paper);color:var(--ink);font-family:Arial,"Noto Sans TC","Microsoft JhengHei",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:var(--dark);color:#dbe4f5;font-size:13px}
    .topbar-inner{min-height:36px;display:flex;align-items:center;justify-content:space-between;gap:20px}
    .topbar-contact{display:flex;gap:22px}
    .topbar a:hover{color:var(--accent)}
    .header{position:relative;z-index:20;background:rgba(255,255,255,.97);border-bottom:1px solid var(--line)}
    .header-inner{min-height:78px;display:flex;align-items:center;gap:32px}
    .logo{display:inline-flex;align-items:center;gap:10px;flex:none;font-weight:800;letter-spacing:.02em}
    .logo img{width:34px;height:34px;object-fit:contain}
    .logo span{font-size:18px}
    .main-nav{flex:1}
    .nav-list{display:flex;justify-content:center;align-items:stretch;gap:4px;list-style:none;padding:0;margin:0}
    .nav-item{position:relative}
    .nav-link{display:flex;align-items:center;gap:7px;padding:26px 13px;color:#344054;font-size:14px;white-space:nowrap}
    .nav-link:hover,.nav-item:focus-within>.nav-link{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:translate(-50%,8px);width:300px;padding:18px;background:#fff;border:1px solid var(--line);box-shadow:var(--shadow);opacity:0;visibility:hidden;pointer-events:none;transition:.2s ease}
    .mega-menu{width:min(720px,calc(100vw - 32px));padding:22px}
    .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;transform:translate(-50%,0)}
    .dropdown-panel:before,.mega-menu:before{content:"";position:absolute;left:0;right:0;top:-12px;height:12px}
    .dropdown-panel>a{display:block;padding:8px 0;border-bottom:1px solid #edf0f5;font-size:14px}
    .dropdown-panel>a:hover,.mega-categories a:hover{color:var(--theme)}
    .dropdown-all,.mega-footer{display:block;margin-top:14px;color:var(--theme);font-size:13px;font-weight:700}
    .mega-head{display:flex;align-items:baseline;justify-content:space-between;gap:18px;padding-bottom:15px;border-bottom:1px solid var(--line)}
    .mega-head strong{font-size:17px}
    .mega-head span{color:var(--muted);font-size:12px}
    .mega-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-top:16px}
    .mega-card{display:flex;gap:10px;min-width:0;padding:10px;border:1px solid #edf0f5;background:#fbfcfe}
    .mega-card:hover{border-color:#9db5df;background:#f5f8ff}
    .mega-card>img{width:42px;height:42px;object-fit:cover;flex:none}
    .mega-card-body{min-width:0;display:grid;gap:2px}
    .mega-card-body strong,.mega-card-body small{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
    .mega-card-body strong{font-size:13px}
    .mega-card-body small{color:var(--muted);font-size:11px}
    .mega-categories{display:flex;flex-wrap:wrap;gap:8px;margin-top:15px}
    .mega-categories a{padding:5px 10px;background:#f0f4fb;color:#45546e;font-size:12px}
    .header-btns{display:flex;align-items:center;gap:12px}
    .header-btns>a:first-child{font-size:13px;color:var(--theme);font-weight:700}
    .account-btn{padding:9px 15px;background:var(--theme);color:#fff;font-size:13px;font-weight:700}
    .hamburger{display:none;width:42px;height:42px;padding:10px;border:1px solid var(--line);background:#fff;cursor:pointer}
    .hamburger span{display:block;width:20px;height:2px;margin:4px auto;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{position:fixed;inset:0;z-index:28;background:rgba(8,15,30,.5);opacity:0;visibility:hidden;transition:.2s}
    .drawer-overlay.open{opacity:1;visibility:visible}
    .mobile-drawer{position:fixed;top:0;right:0;z-index:29;width:min(380px,88vw);height:100vh;overflow:auto;background:#fff;transform:translateX(100%);transition:.25s ease;box-shadow:-12px 0 35px rgba(0,0,0,.15)}
    .mobile-drawer.open{transform:translateX(0)}
    .drawer-head{display:flex;align-items:center;gap:15px;padding:20px;border-bottom:1px solid var(--line)}
    .drawer-head>a{margin-left:auto;color:var(--theme);font-weight:700}
    .drawer-close{border:0;background:none;color:var(--muted);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 #edf0f5;background:none;text-align:left;color:var(--ink);font-weight:700;cursor:pointer}
    .drawer-toggle:after{content:"+";float:right;color:var(--theme);font-size:20px;font-weight:400}
    .drawer-toggle.active:after{content:"−"}
    .drawer-submenu{display:none;padding:4px 0 8px 14px}
    .drawer-submenu.open{display:block}
    .drawer-submenu a{display:block;padding:7px 0;color:var(--muted);font-size:14px}
    .footer{margin-top:80px;background:var(--dark);color:#d8e0ed}
    .footer-main{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:42px;padding:58px 0 44px}
    .footer-brand p{max-width:330px;margin:18px 0 0;color:#9eabc0;font-size:13px}
    .footer .logo{color:#fff}
    .footer h3{margin:2px 0 14px;color:#fff;font-size:14px}
    .footer-links{display:grid;gap:8px}
    .footer-links a,.footer-contact a{color:#aeb9ca;font-size:13px}
    .footer-links a:hover,.footer-contact a:hover{color:var(--accent)}
    .footer-contact{display:grid;gap:9px}
    .footer-social{color:#aeb9ca;font-size:13px}
    .footer-bottom{display:flex;justify-content:space-between;gap:20px;padding:18px 0;border-top:1px solid rgba(255,255,255,.12);color:#8996aa;font-size:12px}
    .tool-detail-page{padding:70px 0 0}
    .tool-detail-page .breadcrumb{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:24px;color:var(--muted);font-size:13px}
    .tool-detail-page .breadcrumb a{color:var(--theme)}
    .tool-detail-layout{display:grid;grid-template-columns:minmax(0,1fr) 310px;gap:30px;align-items:start}
    .tool-article,.related-tools{background:var(--white);border:1px solid var(--line);box-shadow:0 10px 30px rgba(16,24,40,.05)}
    .tool-article{padding:clamp(24px,4vw,48px)}
    .tool-kicker{display:inline-flex;align-items:center;gap:8px;color:var(--theme);font-size:13px;font-weight:700}
    .tool-kicker:before{content:"";width:24px;height:2px;background:var(--theme)}
    .tool-article h1{margin:12px 0 10px;color:var(--dark);font-size:clamp(30px,4vw,48px);line-height:1.2}
    .tool-intro{margin:0 0 24px;color:var(--muted);font-size:17px}
    .tool-meta{display:flex;flex-wrap:wrap;gap:15px;padding:15px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line);color:var(--muted);font-size:13px}
    .tool-icon{width:84px;height:84px;margin:26px 0 8px;border:1px solid var(--line);padding:12px;object-fit:contain;background:#f8faff}
    .tool-content{min-width:0;max-width:100%;overflow-x:auto;margin-top:28px;color:#344054}
    .tool-content img{max-width:100%;height:auto}
    .tool-content table{max-width:100%;display:block;overflow-x:auto;border-collapse:collapse}
    .tool-content h2,.tool-content h3{color:var(--dark);line-height:1.3}
    .tool-content h2{margin-top:32px;font-size:25px}
    .tool-content h3{font-size:19px}
    .tool-content a{color:var(--theme);text-decoration:underline}
    .related-tools{padding:22px;position:sticky;top:22px}
    .related-tools h2{margin:0 0 16px;font-size:19px;color:var(--dark)}
    .related-tool-card{display:grid;grid-template-columns:46px minmax(0,1fr);gap:11px;padding:13px 0;border-top:1px solid var(--line)}
    .related-tool-card img{width:46px;height:46px;padding:7px;object-fit:contain;border:1px solid var(--line);background:#f8faff}
    .related-tool-card strong{display:block;font-size:14px}
    .related-tool-card p{margin:2px 0 0;color:var(--muted);font-size:12px;line-height:1.5}
    .related-tool-card:hover strong{color:var(--theme)}
    @media (max-width:1050px){
      .header-inner{gap:18px}
      .nav-link{padding-left:8px;padding-right:8px;font-size:13px}
      .footer-main{grid-template-columns:1.3fr 1fr 1fr}
    }
    @media (max-width:820px){
      .container{width:min(100% - 28px,680px)}
      .topbar-inner{padding:8px 0;align-items:flex-start}
      .topbar-contact{gap:10px;flex-direction:column;align-items:flex-end}
      .main-nav{display:none}
      .hamburger{display:block}
      .header-inner{min-height:68px}
      .header-btns>a:first-child{display:none}
      .mega-grid{grid-template-columns:1fr 1fr}
      .tool-detail-page{padding-top:40px}
      .tool-detail-layout{grid-template-columns:1fr}
      .related-tools{position:static}
      .footer-main{grid-template-columns:1fr 1fr;gap:30px;padding-top:40px}
    }
    @media (max-width:520px){
      .topbar{font-size:11px}
      .topbar-contact a{font-size:11px}
      .account-btn{display:none}
      .mega-grid{grid-template-columns:1fr}
      .tool-article{padding:22px 18px}
      .tool-article h1{font-size:31px}
      .tool-intro{font-size:15px}
      .footer-main{grid-template-columns:1fr}
      .footer-bottom{display:grid}
    }