:root{
      --theme:#0B3D91;
      --ink:#101216;
      --muted:#687080;
      --line:#dfe4eb;
      --paper:#f5f7fa;
      --white:#fff;
      --shadow:0 18px 50px rgba(15,34,65,.09);
      --radius:18px;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{margin:0;color:var(--ink);background:var(--paper);font-family:Arial,"Microsoft YaHei","PingFang SC",sans-serif;line-height:1.6}
    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:#101216;color:#dce4f2;font-size:13px}
    .topbar-inner{min-height:36px;display:flex;align-items:center;justify-content:space-between;gap:20px}
    .topbar-info{display:flex;gap:22px}
    .topbar a{color:#fff;opacity:.9}
    .topbar a:hover{color:#7ca9f5}

    .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;min-width:190px;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;align-items:stretch;justify-content:center;gap:4px;list-style:none;padding:0;margin:0}
    .nav-item{position:relative}
    .nav-link{display:flex;align-items:center;gap:5px;padding:27px 14px;font-size:14px;white-space:nowrap}
    .nav-link:hover,.nav-item:focus-within>.nav-link{color:var(--theme)}
    .has-arrow:after{content:"⌄";font-size:12px;color:#7c8797}
    .dropdown-panel,.mega-menu{position:absolute;top:100%;left:50%;transform:translateX(-50%) translateY(8px);width:280px;padding:18px;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:620px}
    .nav-item:before{content:"";position:absolute;left:0;right:0;height:14px;top:100%}
    .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:translateX(-50%) translateY(0)}
    .dropdown-panel>a{display:block;padding:9px 10px;border-bottom:1px solid #eef1f5;font-size:14px}
    .dropdown-panel>a:hover{color:var(--theme);background:#f5f8fd}
    .mega-heading{margin:0 0 13px;font-size:16px}
    .mega-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}
    .mega-card{display:block;min-height:74px;padding:12px;border:1px solid #e6eaf0;border-radius:10px;background:#fbfcfe}
    .mega-card:hover{border-color:#9ab4de;background:#f4f8ff}
    .mega-card img{width:24px;height:24px;object-fit:contain;margin-bottom:5px}
    .mega-card strong,.mega-card small{display:block}
    .mega-card strong{font-size:13px;margin-bottom:3px}
    .mega-card small{font-size:11px;color:var(--muted);line-height:1.5}
    .mega-footer{display:block;margin-top:14px;color:var(--theme);font-size:13px;font-weight:700}
    .header-btns{display:flex;align-items:center;gap:12px;white-space:nowrap}
    .member-link{font-size:13px;color:var(--theme);font-weight:700}
    .open-link{padding:8px 14px;border-radius:8px;background:var(--theme);color:#fff;font-size:13px}
    .hamburger{display:none;border:0;background:transparent;padding:8px;cursor:pointer}
    .hamburger span{display:block;width:23px;height:2px;margin:4px 0;background:#101216;transition:.2s}
    .hamburger.active span:first-child{transform:translateY(6px) rotate(45deg)}
    .hamburger.active span:nth-child(2){opacity:0}
    .hamburger.active span:last-child{transform:translateY(-6px) rotate(-45deg)}

    .drawer-overlay{position:fixed;inset:0;background:rgba(5,12,24,.5);opacity:0;visibility:hidden;z-index:40;transition:.2s}
    .drawer-overlay.open{opacity:1;visibility:visible}
    .mobile-drawer{position:fixed;top:0;right:0;width:min(390px,88vw);height:100vh;overflow:auto;background:#fff;z-index:41;transform:translateX(100%);transition:.25s;padding-bottom:30px}
    .mobile-drawer.open{transform:translateX(0)}
    .drawer-head{height:72px;display:flex;align-items:center;justify-content:space-between;padding:0 22px;border-bottom:1px solid var(--line);font-weight:700}
    .drawer-head>a{color:var(--theme);margin-left:auto;margin-right:20px;font-size:14px}
    .drawer-close{border:0;background:transparent;font-size:30px;line-height:1;cursor:pointer;color:#687080}
    .drawer-menu{padding:12px 22px}
    .drawer-link,.drawer-toggle{display:block;width:100%;padding:14px 0;border:0;border-bottom:1px solid #edf0f4;background:transparent;text-align:left;font-size:15px;color:var(--ink);cursor:pointer}
    .drawer-toggle:after{content:"＋";float:right;color:#8390a2}
    .drawer-toggle.active:after{content:"－"}
    .drawer-submenu{display:none;padding:5px 0 8px 15px}
    .drawer-submenu.open{display:block}
    .drawer-submenu a{display:block;padding:8px 0;color:var(--muted);font-size:13px}

    .tools-page{padding:0 0 80px}
    .tools-hero{position:relative;overflow:hidden;background:#101216;color:#fff;padding:74px 0 84px}
    .tools-hero:before{content:"";position:absolute;width:520px;height:520px;right:-180px;top:-250px;border:1px solid rgba(255,255,255,.12);border-radius:50%;box-shadow:0 0 0 70px rgba(11,61,145,.13),0 0 0 140px rgba(255,255,255,.04)}
    .tools-hero:after{content:"";position:absolute;left:0;right:0;bottom:0;height:1px;background:linear-gradient(90deg,transparent,var(--theme),transparent)}
    .tools-hero-inner{position:relative;z-index:1;max-width:850px}
    .eyebrow{display:inline-flex;align-items:center;gap:9px;color:#91b9ff;font-size:12px;letter-spacing:.14em;text-transform:uppercase}
    .eyebrow:before{content:"";width:28px;height:1px;background:#91b9ff}
    .tools-hero h1{font-size:clamp(42px,7vw,86px);line-height:1.04;letter-spacing:-.055em;margin:18px 0 20px;max-width:760px}
    .tools-hero p{max-width:650px;color:#b9c4d4;font-size:17px;margin:0}
    .tools-hero-meta{display:flex;flex-wrap:wrap;gap:10px;margin-top:30px}
    .tools-hero-meta span{padding:8px 13px;border:1px solid rgba(255,255,255,.2);border-radius:999px;color:#dce6f7;font-size:12px}
    .tools-content{padding-top:52px}
    .section-head{display:flex;align-items:end;justify-content:space-between;gap:20px;margin-bottom:24px}
    .section-head h2{font-size:28px;line-height:1.2;margin:0}
    .section-head p{margin:0;color:var(--muted);font-size:14px}
    .tools-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}
    .tool-card{display:flex;flex-direction:column;min-height:270px;padding:24px;background:#fff;border:1px solid #e4e8ee;border-radius:var(--radius);box-shadow:0 5px 18px rgba(20,34,58,.035);transition:.22s}
    .tool-card:hover{transform:translateY(-5px);border-color:#a7bfe7;box-shadow:var(--shadow)}
    .tool-icon{display:flex;align-items:center;justify-content:center;width:52px;height:52px;border-radius:14px;background:#edf3fc;margin-bottom:18px}
    .tool-icon img{width:30px;height:30px;object-fit:contain}
    .tool-card h3{font-size:19px;line-height:1.35;margin:0 0 8px}
    .tool-card p{color:var(--muted);font-size:14px;line-height:1.75;margin:0 0 18px;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}
    .tool-card-footer{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-top:auto;padding-top:15px;border-top:1px solid #edf0f4;color:#8a95a5;font-size:12px}
    .tool-card-footer a{color:var(--theme);font-weight:700}
    .tools-note{margin-top:34px;padding:25px 28px;border-radius:16px;background:#eaf1fb;border:1px solid #cbdcf5;display:flex;align-items:center;justify-content:space-between;gap:24px}
    .tools-note h3{margin:0 0 5px;font-size:18px}
    .tools-note p{margin:0;color:#52657f;font-size:14px}
    .tools-note a{flex:none;padding:11px 18px;background:var(--theme);border-radius:8px;color:#fff;font-size:13px;font-weight:700}

    .footer{background:#101216;color:#d9e0eb;padding:55px 0 20px}
    .footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:42px}
    .footer-brand{color:#fff;font-size:20px;font-weight:800;margin-bottom:14px}
    .footer p{margin:7px 0;color:#9da8b7;font-size:13px;line-height:1.8}
    .footer h3{margin:0 0 15px;color:#fff;font-size:14px}
    .footer-grid>div>a{display:block;color:#aeb8c7;font-size:13px;padding:4px 0}
    .footer-grid>div>a:hover{color:#fff}
    .footer-bottom{display:flex;justify-content:space-between;gap:20px;border-top:1px solid #2a303a;margin-top:38px;padding-top:18px;color:#7f8998;font-size:12px}

    @media (max-width:900px){
      .header-inner{gap:15px}
      .logo{min-width:auto}
      .main-nav{display:none}
      .header-btns{margin-left:auto}
      .hamburger{display:block}
      .tools-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
      .footer-grid{grid-template-columns:repeat(2,1fr)}
    }
    @media (max-width:620px){
      .container{width:min(100% - 28px,1180px)}
      .topbar-inner{padding:8px 0;align-items:flex-start;flex-direction:column;gap:2px}
      .topbar-info{gap:12px;flex-wrap:wrap}
      .header-inner{height:68px}
      .logo span{font-size:16px}
      .member-link{display:none}
      .open-link{padding:7px 10px}
      .tools-hero{padding:55px 0 62px}
      .tools-hero h1{font-size:48px}
      .tools-hero p{font-size:15px}
      .section-head{display:block}
      .section-head p{margin-top:8px}
      .tools-grid{grid-template-columns:1fr}
      .tool-card{min-height:240px}
      .tools-note{display:block;padding:22px}
      .tools-note a{display:inline-block;margin-top:17px}
      .footer-grid{grid-template-columns:1fr;gap:25px}
      .footer-bottom{display:block}
      .footer-bottom span{display:block;margin-top:5px}
    }