:root{--theme:#0B3D91;--ink:#14213d;--muted:#64748b;--line:#e5eaf2;--soft:#f5f8fc;--gold:#f2b84b}
    *{box-sizing:border-box}html,body{margin:0;padding:0;color:var(--ink);font-family:"Microsoft YaHei","PingFang SC",Arial,sans-serif;background:#fff}a{text-decoration:none;color:inherit}.container{width:min(1180px,calc(100% - 40px));margin:auto}
    .topbar{background:#0d1d38;color:#d9e4f5;font-size:13px}.topbar-inner{min-height:36px;display:flex;justify-content:space-between;align-items:center}.topbar-links{display:flex;gap:22px}.topbar a{color:#d9e4f5}
    .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:flex;align-items:center;gap:10px;min-width:185px;font-size:19px;font-weight:800;color:var(--theme)}.logo img{width:38px;height:38px;object-fit:contain}.main-nav{flex:1}.nav-list{list-style:none;display:flex;align-items:stretch;justify-content:center;gap:4px;margin:0;padding:0;height:78px}.nav-item{position:relative;display:flex;align-items:center}.nav-link{padding:29px 13px;font-size:15px;white-space:nowrap}.nav-link:hover,.nav-link:focus{color:var(--theme)}.has-arrow:after{content:"⌄";font-size:12px;margin-left:6px;color:#789}
    .dropdown-panel,.mega-menu{position:absolute;top:calc(100% - 1px);left:50%;transform:translateX(-50%);opacity:0;visibility:hidden;transition:.2s ease;background:#fff;border:1px solid var(--line);box-shadow:0 18px 45px #10244a1c;border-radius:0 0 14px 14px}.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}.dropdown-panel{width:300px;padding:20px}.dropdown-title,.mega-title{margin:0 0 12px;font-size:13px;color:var(--theme);font-weight:800}.dropdown-list{display:grid;gap:11px}.dropdown-list a{font-size:14px;line-height:1.5}.dropdown-list a:hover,.mega-links a:hover{color:var(--theme)}
    .mega-menu{width:760px;padding:24px}.mega-grid{display:grid;grid-template-columns:1fr 1fr;gap:28px}.mega-cards{display:grid;grid-template-columns:1fr 1fr;gap:10px}.mega-card{display:flex;gap:9px;padding:10px;border:1px solid var(--line);border-radius:10px;min-width:0}.mega-card:hover{border-color:#9bb4da;background:#f7faff}.mega-card img{width:34px;height:34px;object-fit:contain;border-radius:6px;background:#eef3fa;flex:none}.mega-card span{display:grid;gap:3px;min-width:0;font-size:11px;color:var(--muted);line-height:1.35}.mega-card strong{font-size:13px;color:var(--ink);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.mega-links{display:grid;grid-template-columns:1fr 1fr;gap:10px}.mega-links a{font-size:13px}.mega-footer{display:inline-block;margin-top:18px;color:var(--theme);font-size:13px;font-weight:700}
    .header-btns{display:flex;align-items:center;gap:10px;white-space:nowrap}.member-link{color:var(--theme);font-size:14px}.account-link{padding:11px 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:24px;height:2px;margin:5px;background:var(--ink);transition:.2s}.hamburger.active span:nth-child(1){transform:translateY(7px) rotate(45deg)}.hamburger.active span:nth-child(2){opacity:0}.hamburger.active span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
    .drawer-overlay{display:none;position:fixed;inset:0;background:#07172b99;z-index:40}.drawer-overlay.open{display:block}.mobile-drawer{position:fixed;z-index:50;top:0;right:0;width:min(390px,88vw);height:100vh;background:#fff;transform:translateX(105%);transition:.28s ease;box-shadow:-10px 0 35px #07172b25;overflow:auto}.mobile-drawer.open{transform:translateX(0)}.drawer-head{height:70px;padding:0 20px;display:flex;align-items:center;gap:15px;border-bottom:1px solid var(--line);font-weight:700}.drawer-head span{flex:1;color:var(--theme)}.drawer-head a{color:var(--theme);font-size:14px}.drawer-close{border:0;background:none;font-size:28px;color:#52627b;cursor:pointer}.drawer-menu{padding:12px 20px}.drawer-link,.drawer-toggle{display:block;width:100%;padding:15px 0;border:0;border-bottom:1px solid var(--line);background:none;text-align:left;font:inherit;color:var(--ink);cursor:pointer}.drawer-toggle:after{content:"＋";float:right;color:var(--theme)}.drawer-toggle.active:after{content:"－"}.drawer-submenu{display:none;padding:4px 0 8px 14px}.drawer-submenu.open{display:grid}.drawer-submenu a{padding:9px 0;color:var(--muted);font-size:14px}
    .tool-detail-page{background:linear-gradient(180deg,#f5f8fd 0,#fff 430px);padding:64px 0 90px}.tool-layout{display:grid;grid-template-columns:minmax(0,1fr) 310px;gap:28px;align-items:start}.tool-article,.related-tools{background:#fff;border:1px solid var(--line);border-radius:18px;box-shadow:0 12px 35px #10244a0b}.tool-article{padding:clamp(25px,5vw,52px)}.tool-breadcrumb{font-size:13px;color:var(--muted);margin-bottom:24px}.tool-breadcrumb a{color:var(--theme)}.tool-heading{display:flex;align-items:flex-start;gap:18px;border-bottom:1px solid var(--line);padding-bottom:28px}.tool-heading img{width:68px;height:68px;object-fit:contain;border-radius:16px;padding:10px;background:#edf3fb}.tool-heading h1{margin:0 0 10px;font-size:clamp(28px,4vw,44px);letter-spacing:-1px}.tool-intro{margin:0;color:var(--muted);font-size:16px;line-height:1.8}.tool-meta{display:flex;flex-wrap:wrap;gap:18px;margin:22px 0;color:var(--muted);font-size:13px}.tool-meta b{color:var(--ink)}.tool-actions{display:flex;flex-wrap:wrap;gap:12px;margin:22px 0 32px}.primary-btn,.secondary-btn{display:inline-flex;align-items:center;justify-content:center;padding:13px 20px;border-radius:9px;font-size:14px;font-weight:700}.primary-btn{background:var(--theme);color:#fff}.secondary-btn{border:1px solid #cbd7e8;color:var(--theme);background:#fff}.tool-body{min-width:0;max-width:100%;overflow-x:auto;color:#35445c;font-size:16px;line-height:2}.tool-body img{max-width:100%;height:auto}.tool-body table{max-width:100%;display:block;overflow-x:auto;border-collapse:collapse}.tool-body h2,.tool-body h3{color:var(--ink);line-height:1.35;margin:30px 0 12px}.tool-body blockquote{margin:20px 0;padding:12px 20px;border-left:4px solid var(--gold);background:#fff9ed;color:#59677d}.related-tools{padding:24px;position:sticky;top:20px}.related-tools h2{font-size:18px;margin:0 0 18px}.related-card{display:flex;gap:12px;padding:14px 0;border-bottom:1px solid var(--line)}.related-card:last-child{border-bottom:0}.related-card img{width:42px;height:42px;object-fit:contain;background:#f0f4fa;border-radius:9px;padding:6px}.related-card strong{display:block;font-size:14px;margin-bottom:5px}.related-card p{margin:0;color:var(--muted);font-size:12px;line-height:1.5}.related-card:hover strong{color:var(--theme)}
    .footer{background:#0d1d38;color:#c8d4e7;padding:55px 0 20px}.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:38px}.footer-brand strong{font-size:22px;color:#fff}.footer-brand p{color:#aabbd2;font-size:13px;line-height:1.8;max-width:280px}.footer h3{margin:0 0 16px;color:#fff;font-size:15px}.footer-links{display:grid;gap:10px;font-size:13px;color:#aabbd2}.footer-links a:hover{color:#fff}.footer-bottom{display:flex;justify-content:space-between;gap:20px;border-top:1px solid #ffffff1c;margin-top:38px;padding-top:20px;color:#8fa4c0;font-size:12px}
    @media(max-width:1050px){.main-nav{display:none}.header-inner{justify-content:space-between}.header-btns{margin-left:auto}.hamburger{display:block}.mega-menu{width:min(760px,calc(100vw - 30px))}}
    @media(max-width:760px){.container{width:min(100% - 28px,1180px)}.topbar-inner{padding:8px 0;align-items:flex-start;gap:8px}.topbar-links{gap:8px;flex-direction:column;text-align:right;font-size:11px}.header-inner{height:68px}.logo{min-width:0;font-size:16px}.logo img{width:32px;height:32px}.member-link{display:none}.account-link{padding:9px 11px}.tool-detail-page{padding:34px 0 60px}.tool-layout{grid-template-columns:1fr}.tool-article{padding:24px 18px}.tool-heading{gap:12px}.tool-heading img{width:52px;height:52px}.tool-heading h1{font-size:28px}.tool-intro{font-size:14px}.tool-body{font-size:15px}.related-tools{position:static}.footer-grid{grid-template-columns:1fr 1fr;gap:28px}.footer-brand{grid-column:1/-1}.footer-bottom{display:grid;line-height:1.7}.mega-grid{grid-template-columns:1fr}.mega-cards{grid-template-columns:1fr}}