:root{
  --theme:#0B3D91;
  --ink:#111318;
  --muted:#697080;
  --paper:#f5f7fb;
  --line:#dfe5ef;
  --white:#fff;
  --shadow:0 16px 45px rgba(20,42,79,.09);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;color:var(--ink);background:var(--paper);font-family:"Microsoft YaHei","PingFang SC",Arial,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:#101725;color:#cbd5e5;font-size:13px}
.topbar .container{min-height:36px;display:flex;align-items:center;justify-content:space-between;gap:20px}
.topbar a{color:#e8edf6;margin-left:20px}


.header{position:relative;z-index:20;background:#fff;border-bottom:1px solid var(--line)}
.header-inner{min-height:76px;display:flex;align-items:center;gap:28px}
.logo{display:flex;align-items:center;gap:10px;min-width:190px;font-size:18px;font-weight:800;color:var(--theme)}
.logo img{width:38px;height:38px;object-fit:contain}
.main-nav{flex:1}
.nav-list{display:flex;align-items:center;justify-content:center;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;font-size:14px;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:330px;padding:16px;background:#fff;border:1px solid var(--line);border-radius:0 0 14px 14px;box-shadow:var(--shadow);opacity:0;visibility:hidden;transition:.2s ease;z-index:30}
.mega-menu{width:580px}
.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:flex;justify-content:space-between;gap:12px;padding:10px;border-radius:8px}
.dropdown-panel>a:not(.mega-footer):hover,.mega-menu a:hover{background:#f0f4fa}
.dropdown-panel small{color:var(--muted);white-space:nowrap}
.mega-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}
.mega-card{display:block;padding:12px;border-radius:10px;border:1px solid transparent}
.mega-card img{width:28px;height:28px;object-fit:contain;margin-bottom:6px}
.mega-card strong{display:block;font-size:14px}
.mega-card small{display:block;color:var(--muted);font-size:12px;line-height:1.5;margin-top:4px}
.mega-grid>a:not(.mega-card){padding:8px;font-size:13px;border-radius:7px}
.mega-footer{display:block;margin-top:12px;padding-top:12px;border-top:1px solid var(--line);color:var(--theme);font-weight:700;font-size:13px}
.header-btns{display:flex;align-items:center;gap:9px;white-space:nowrap}
.member-btn{font-size:13px;color:var(--theme)}
.account-btn{padding:9px 15px;background:var(--theme);color:#fff;border-radius:7px;font-size:13px}
.hamburger{display:none;border:0;background:transparent;padding:8px;cursor:pointer}
.hamburger span{display:block;width:23px;height:2px;margin:5px 0;background:var(--ink);transition:.2s}


.drawer-overlay{display:none;position:fixed;inset:0;background:rgba(10,17,30,.52);z-index:50}
.drawer-overlay.open{display:block}
.mobile-drawer{position:fixed;top:0;right:0;width:min(380px,88vw);height:100vh;background:#fff;z-index:60;transform:translateX(100%);transition:.25s ease;overflow-y:auto}
.mobile-drawer.open{transform:translateX(0)}
.drawer-head{height:72px;display:flex;align-items:center;gap:16px;padding:0 20px;border-bottom:1px solid var(--line)}
.drawer-head strong{flex:1;color:var(--theme)}
.drawer-head a{font-size:13px;color:var(--theme)}
.drawer-close{border:0;background:transparent;font-size:30px;line-height:1;cursor:pointer;color:var(--muted)}
.drawer-menu{padding:12px 20px 30px}
.drawer-link,.drawer-toggle{display:block;width:100%;padding:14px 2px;border:0;border-bottom:1px solid var(--line);background:transparent;text-align:left;font-size:15px;cursor:pointer}
.drawer-toggle:after{content:"+";float:right;font-size:20px;color:var(--muted)}
.drawer-toggle.active:after{content:"−"}
.drawer-submenu{max-height:0;overflow:hidden;transition:max-height .25s ease;padding-left:13px}
.drawer-submenu.open{max-height:700px}
.drawer-submenu a{display:block;padding:9px 0;color:var(--muted);font-size:14px}


.tools-page{padding:54px 0 84px}
.tools-intro{text-align:center;max-width:760px;margin:0 auto 38px}
.eyebrow{display:inline-flex;align-items:center;gap:8px;color:var(--theme);font-size:13px;font-weight:800;letter-spacing:.14em}
.eyebrow:before{content:"";width:24px;height:2px;background:var(--theme)}
.tools-intro h1{margin:13px 0 12px;font-size:clamp(32px,5vw,58px);line-height:1.12;letter-spacing:-.04em}
.tools-intro p{margin:0;color:var(--muted);font-size:16px}
.tools-toolbar{display:flex;align-items:center;justify-content:space-between;gap:18px;padding:17px 20px;margin-bottom:24px;background:#fff;border:1px solid var(--line);border-radius:14px}
.tools-toolbar strong{font-size:16px}
.tools-toolbar span{color:var(--muted);font-size:13px}
.tools-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.tool-card{display:flex;flex-direction:column;min-height:255px;padding:24px;background:#fff;border:1px solid var(--line);border-radius:16px;box-shadow:0 7px 22px rgba(20,42,79,.04);transition:transform .2s ease,box-shadow .2s ease,border-color .2s ease}
.tool-card:hover{transform:translateY(-5px);border-color:#aebfdf;box-shadow:var(--shadow)}
.tool-icon{width:56px;height:56px;padding:10px;margin-bottom:18px;border-radius:14px;background:#edf3fc;object-fit:contain}
.tool-card h2{font-size:19px;margin:0 0 8px;line-height:1.35}
.tool-card p{display:-webkit-box;-webkit-box-orient:vertical;-webkit-line-clamp:3;overflow:hidden;min-height:72px;margin:0;color:var(--muted);font-size:14px}
.tool-more{display:inline-flex;align-items:center;gap:8px;margin-top:auto;padding-top:20px;color:var(--theme);font-size:14px;font-weight:700}
.tool-more:after{content:"→";font-size:18px;transition:transform .2s}
.tool-card:hover .tool-more:after{transform:translateX(4px)}
.tools-note{margin-top:34px;padding:21px 24px;border-left:4px solid var(--theme);background:#eaf0fa;color:#33415a;border-radius:0 10px 10px 0;font-size:14px}


.footer{background:#101725;color:#d5dcea;padding:52px 0 20px}
.footer-grid{display:grid;grid-template-columns:1.45fr 1fr 1fr 1fr;gap:35px}
.footer-brand{color:#fff;font-weight:800;font-size:21px;margin-bottom:12px}
.footer p{margin:7px 0;color:#9da9bb;font-size:13px}
.footer h3{margin:0 0 14px;color:#fff;font-size:15px}
.footer-grid>div>a{display:block;color:#aab5c7;font-size:13px;margin:7px 0}
.footer-grid>div>a:hover{color:#fff}
.footer-bottom{border-top:1px solid #2b3546;margin-top:38px;padding-top:18px;color:#8793a8;font-size:12px}

@media (max-width:980px){
  .main-nav{display:none}
  .header-btns{margin-left:auto}
  .hamburger{display:block}
  .tools-grid{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:repeat(2,1fr)}
}
@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 a{margin-left:0;margin-right:14px}
  .header-inner{min-height:66px;gap:10px}
  .logo{min-width:0;font-size:15px}
  .logo img{width:32px;height:32px}
  .member-btn{display:none}
  .account-btn{padding:8px 11px;font-size:12px}
  .tools-page{padding:38px 0 58px}
  .tools-intro h1{font-size:38px}
  .tools-intro p{font-size:14px}
  .tools-toolbar{display:block}
  .tools-toolbar span{display:block;margin-top:4px}
  .tools-grid{grid-template-columns:1fr;gap:14px}
  .tool-card{min-height:230px}
  .footer{padding-top:38px}
  .footer-grid{grid-template-columns:1fr 1fr;gap:25px 18px}
  .footer-grid>div:first-child{grid-column:1/-1}
}