:root{--theme:#0B3D91;--ink:#172033;--muted:#687386;--line:#e4e8ef;--soft:#f5f7fb;--card:#fff;--accent:#e46d4c}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;color:var(--ink);background:#fff;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Microsoft YaHei",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:0 auto}
.topbar{background:#101827;color:#cbd3df;font-size:13px}
.topbar-inner{min-height:36px;display:flex;justify-content:space-between;align-items:center;gap:20px}
.topbar p{margin:0}
.topbar-contact{display:flex;gap:20px}
.topbar-contact 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:30px}
.logo{display:inline-flex;align-items:center;gap:10px;font-weight:800;font-size:20px;white-space:nowrap;color:var(--ink)}
.logo img{width:36px;height:36px;object-fit:contain}
.main-nav{margin-left:auto}
.nav-list{display:flex;align-items:center;gap:4px;margin:0;padding:0;list-style:none}
.nav-item{position:relative}
.nav-link{display:flex;align-items:center;gap:5px;padding:27px 14px;font-size:15px;font-weight:600;white-space:nowrap}
.nav-link:hover,.nav-link:focus{color:var(--theme)}
.has-arrow:after{content:"";width:6px;height:6px;border-right:1.5px solid currentColor;border-bottom:1.5px solid currentColor;transform:rotate(45deg) translateY(-2px)}
.dropdown-panel,.mega-menu{position:absolute;top:100%;left:50%;transform:translateX(-50%) translateY(8px);width:330px;padding:20px;background:#fff;border:1px solid var(--line);border-radius:0 0 14px 14px;box-shadow:0 18px 45px #1824381c;opacity:0;visibility:hidden;transition:.2s ease}
.dropdown-panel:before,.mega-menu:before{content:"";position:absolute;left:0;right:0;top:-12px;height:12px}
.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-title,.mega-head{display:flex;justify-content:space-between;align-items:center;gap:15px;margin-bottom:13px}
.dropdown-title span,.mega-head strong{font-weight:800}
.dropdown-title a,.mega-footer{color:var(--theme);font-size:13px}
.dropdown-article{display:block;padding:9px 0;border-top:1px solid var(--line);font-size:14px}
.mega-menu{width:650px}
.mega-menu-wide{width:820px}
.mega-head{display:block}
.mega-head strong{display:block;font-size:16px}
.mega-head span{display:block;color:var(--muted);font-size:13px}
.mega-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:10px}
.mega-card{display:flex;gap:10px;min-width:0;padding:11px;border:1px solid var(--line);border-radius:10px;background:#fbfcfe}
.mega-card:hover{border-color:#a9bddd;background:#f4f7fc}
.mega-card>img{width:42px;height:42px;object-fit:contain;border-radius:7px;background:#fff;flex:none}
.mega-card-body{min-width:0}
.mega-card-body strong,.mega-card-body p,.mega-card-body small{display:block;overflow:hidden}
.mega-card-body strong{font-size:14px;white-space:nowrap;text-overflow:ellipsis}
.mega-card-body small,.mega-card-body p{margin:2px 0;color:var(--muted);font-size:11px;line-height:1.45}
.mega-card-body p{font-size:12px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical}
.video-mega-card>img{width:78px;height:48px;object-fit:cover}
.mega-categories{display:flex;flex-wrap:wrap;gap:7px;margin:0 0 14px}
.mega-categories a{padding:4px 9px;background:var(--soft);border-radius:20px;color:var(--theme);font-size:12px}
.mega-footer{display:block;margin-top:16px;padding-top:13px;border-top:1px solid var(--line);text-align:right}
.header-btns{display:flex;align-items:center;gap:12px}
.member-entry{padding:7px 11px;border:1px solid #d5ddea;border-radius:7px;color:var(--theme);font-size:13px;white-space:nowrap}
.account-entry{padding:8px 16px;border-radius:7px;background:var(--theme);color:#fff;font-size:13px;white-space:nowrap}
.hamburger{display:none;width:42px;height:40px;padding:9px;border:1px solid var(--line);border-radius:8px;background:#fff;cursor:pointer}
.hamburger span{display:block;width:22px;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:40;background:#08122599;opacity:0;visibility:hidden;transition:.25s}
.drawer-overlay.open{opacity:1;visibility:visible}
.mobile-drawer{position:fixed;right:0;top:0;bottom:0;z-index:41;width:min(390px,88%);padding:22px;background:#fff;overflow:auto;transform:translateX(100%);transition:.25s}
.mobile-drawer.open{transform:translateX(0)}
.drawer-head{display:flex;align-items:center;gap:15px;padding-bottom:18px;border-bottom:1px solid var(--line);font-weight:700}
.drawer-head>a{margin-left:auto;padding:5px 12px;border-radius:5px;background:var(--theme);color:#fff;font-size:13px}
.drawer-close{border:0;background:transparent;font-size:28px;line-height:1;cursor:pointer;color:var(--muted)}
.drawer-menu{padding-top:10px}
.drawer-link,.drawer-toggle{display:block;width:100%;padding:13px 2px;border:0;border-bottom:1px solid var(--line);background:#fff;text-align:left;font-size:15px;color:var(--ink);cursor:pointer}
.drawer-toggle:after{content:"+";float:right;color:var(--muted);font-size:20px;line-height:1}
.drawer-toggle.active:after{content:"−"}
.drawer-submenu{display:none;padding:5px 0 7px 15px}
.drawer-submenu.open{display:block}
.drawer-submenu a{display:block;padding:7px 0;color:var(--muted);font-size:14px}
.footer{margin-top:75px;background:#111a2a;color:#c2ccda}
.footer-main{display:grid;grid-template-columns:2fr 1fr 1fr 1.1fr;gap:42px;padding:48px 0 38px}
.footer .logo{color:#fff}
.footer-brand p{max-width:330px;color:#9eabbc;font-size:13px}
.footer h3{margin:5px 0 15px;color:#fff;font-size:15px}
.footer-links{display:grid;gap:8px;font-size:13px}
.footer-links a:hover,.footer-contact a:hover{color:#fff}
.footer-social{color:#fff;font-size:13px}
.footer-contact{display:grid;gap:3px;font-size:13px}
.footer-contact span{color:#8997aa;margin-top:5px}
.footer-contact a{color:#e5eaf1}
.footer-bottom{display:flex;justify-content:space-between;gap:20px;padding:18px 0;border-top:1px solid #2a3547;color:#8997aa;font-size:12px}
.footer-bottom-links{display:flex;gap:18px}
.footer-bottom-links a:hover{color:#fff}

.tool-detail-page{padding:58px 0 0;background:linear-gradient(180deg,#f5f7fb 0,#fff 360px)}
.tool-detail-page .breadcrumb{display:flex;gap:8px;align-items:center;margin-bottom:24px;color:var(--muted);font-size:13px}
.tool-detail-page .breadcrumb a{color:var(--theme)}
.tool-detail-page .tool-layout{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:30px;align-items:start}
.tool-detail-page .tool-article{min-width:0;background:#fff;border:1px solid var(--line);border-radius:18px;padding:34px;box-shadow:0 10px 30px #1c2b4510}
.tool-detail-page .tool-kicker{display:inline-flex;padding:5px 11px;border-radius:20px;background:#e9f0fc;color:var(--theme);font-size:12px;font-weight:700}
.tool-detail-page h1{margin:13px 0 10px;font-size:clamp(28px,4vw,45px);line-height:1.2;letter-spacing:-.03em}
.tool-detail-page .tool-intro{margin:0 0 24px;color:var(--muted);font-size:17px}
.tool-detail-page .tool-meta{display:flex;flex-wrap:wrap;gap:10px 22px;padding:15px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line);color:var(--muted);font-size:13px}
.tool-detail-page .tool-meta b{color:var(--ink)}
.tool-detail-page .tool-cover{width:100%;max-height:340px;object-fit:cover;margin:26px 0;border-radius:13px;background:var(--soft)}
.tool-detail-page .tool-body{min-width:0;max-width:100%;overflow-x:auto;margin-top:25px;font-size:16px}
.tool-detail-page .tool-body img{max-width:100%;height:auto}
.tool-detail-page .tool-body table{max-width:100%;display:block;overflow-x:auto;border-collapse:collapse}
.tool-detail-page .tool-body h2,.tool-detail-page .tool-body h3{margin-top:28px;color:var(--theme)}
.tool-detail-page .tool-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:28px}
.tool-detail-page .primary-action{padding:10px 18px;border-radius:8px;background:var(--theme);color:#fff;font-size:14px}
.tool-detail-page .secondary-action{padding:9px 17px;border:1px solid #bdc9dc;border-radius:8px;color:var(--theme);font-size:14px}
.tool-detail-page .tool-sidebar{display:grid;gap:18px}
.tool-detail-page .side-card{padding:23px;border:1px solid var(--line);border-radius:15px;background:#fff}
.tool-detail-page .side-card h2{margin:0 0 15px;font-size:18px}
.tool-detail-page .tool-side-item{display:grid;grid-template-columns:44px 1fr;gap:10px;padding:12px 0;border-top:1px solid var(--line)}
.tool-detail-page .tool-side-item img{width:44px;height:44px;object-fit:contain;border-radius:8px;background:var(--soft)}
.tool-detail-page .tool-side-item strong{display:block;font-size:14px}
.tool-detail-page .tool-side-item p{margin:2px 0;color:var(--muted);font-size:12px;line-height:1.5}
.tool-detail-page .notice{padding:14px;border-left:3px solid var(--accent);background:#fff7f3;color:#6f483d;font-size:13px}

@media(max-width:900px){
 .main-nav{display:none}.hamburger{display:block}.header-inner{height:68px}.nav-list{display:none}
 .footer-main{grid-template-columns:repeat(2,1fr)}
 .tool-detail-page .tool-layout{grid-template-columns:1fr}
}
@media(max-width:600px){
 .container{width:min(100% - 28px,1180px)}
 .topbar-inner{padding:7px 0;display:block}.topbar-contact{gap:12px;margin-top:3px}
 .topbar-welcome{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
 .member-entry{display:none}.account-entry{display:none}
 .footer-main{grid-template-columns:1fr;gap:25px;padding:35px 0 28px}
 .footer-bottom{display:block}.footer-bottom-links{margin-top:10px;flex-wrap:wrap}
 .tool-detail-page{padding-top:35px}.tool-detail-page .tool-article{padding:23px 18px;border-radius:13px}
 .tool-detail-page .tool-intro{font-size:15px}.tool-detail-page .tool-meta{gap:7px 14px}
}