:root{
      --theme:#0B3D91;
      --theme-deep:#06275f;
      --ink:#132238;
      --muted:#6d7b90;
      --line:#e5ebf3;
      --surface:#ffffff;
      --soft:#f3f7fc;
      --accent:#51c4ed;
      --shadow:0 18px 50px rgba(11,61,145,.10);
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{margin:0;color:var(--ink);background:#f7faff;font-family:"思源黑体","Microsoft YaHei",Arial,sans-serif;line-height:1.6}
    a{color:inherit;text-decoration:none}
    img{display:block;max-width:100%}
    button{font:inherit}
    .container{width:min(1180px,calc(100% - 40px));margin:0 auto}
    .topbar{background:#071a38;color:#b9c8dc;font-size:13px}
    .topbar .container{min-height:38px;display:flex;align-items:center;justify-content:space-between;gap:20px}
    .topbar-links{display:flex;gap:24px}
    .topbar a{color:#dce8f7;transition:color .2s}
    .topbar a:hover{color:var(--accent)}
    .header{position:relative;z-index:20;background:rgba(255,255,255,.97);border-bottom:1px solid var(--line);box-shadow:0 4px 20px rgba(20,45,80,.04)}
    .header-inner{height:78px;display:flex;align-items:center;gap:34px}
    .logo{display:flex;align-items:center;gap:11px;min-width:190px;color:var(--theme-deep);font-size:19px;font-weight:800;white-space:nowrap}
    .logo img{width:38px;height:38px;object-fit:contain}
    .main-nav{flex:1}
    .nav-list{display:flex;align-items:stretch;justify-content:center;gap:4px;margin:0;padding:0;list-style:none}
    .nav-item{position:relative}
    .nav-link{display:flex;align-items:center;height:78px;padding:0 14px;color:#33445d;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;margin:0 0 3px 8px;border-right:1.5px solid currentColor;border-bottom:1.5px solid currentColor;transform:rotate(45deg)}
    .dropdown-panel,.mega-menu{position:absolute;top:100%;left:50%;z-index:30;visibility:hidden;opacity:0;transform:translate(-50%,8px);transition:opacity .2s,transform .2s,visibility .2s;background:#fff;border:1px solid var(--line);box-shadow:var(--shadow);pointer-events:none}
    .dropdown-panel{width:260px;padding:12px;border-radius:0 0 14px 14px}
    .dropdown-panel:before,.mega-menu:before{content:"";position:absolute;left:0;right:0;top:-12px;height:12px}
    .dropdown-panel a{display:block;padding:10px 12px;border-radius:8px;color:#52647c;font-size:14px}
    .dropdown-panel a:hover{background:var(--soft);color:var(--theme)}
    .mega-menu{width:720px;padding:22px;border-radius:0 0 18px 18px}
    .nav-item:hover>.dropdown-panel,.nav-item:focus-within>.dropdown-panel,.nav-item:hover>.mega-menu,.nav-item:focus-within>.mega-menu{visibility:visible;opacity:1;transform:translate(-50%,0);pointer-events:auto}
    .mega-heading{display:flex;align-items:baseline;justify-content:space-between;gap:20px;margin-bottom:15px;padding-bottom:13px;border-bottom:1px solid var(--line)}
    .mega-heading strong{color:var(--theme-deep);font-size:16px}
    .mega-heading span{color:var(--muted);font-size:12px}
    .mega-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}
    .mega-card{display:grid;grid-template-columns:34px 1fr;column-gap:9px;padding:11px;border:1px solid transparent;border-radius:10px}
    .mega-card:hover{background:var(--soft);border-color:#dbe7f6}
    .mega-card img{grid-row:span 3;width:34px;height:34px;object-fit:contain;border-radius:7px}
    .mega-card strong{overflow:hidden;color:#253a57;font-size:13px;text-overflow:ellipsis;white-space:nowrap}
    .mega-card small{overflow:hidden;color:var(--muted);font-size:11px;text-overflow:ellipsis;white-space:nowrap}
    .mega-footer{display:flex;flex-wrap:wrap;gap:10px 18px;margin-top:16px;padding-top:14px;border-top:1px solid var(--line);color:var(--theme);font-size:13px}
    .header-btns{display:flex;align-items:center;gap:13px;white-space:nowrap}
    .member-link{color:var(--theme);font-size:13px;font-weight:700}
    .account-link{padding:9px 16px;border-radius:8px;background:var(--theme);color:#fff;font-size:13px;font-weight:700}
    .account-link:hover{background:var(--theme-deep)}
    .hamburger{display:none;width:42px;height:42px;padding:9px;border:1px solid var(--line);border-radius:9px;background:#fff;cursor:pointer}
    .hamburger span{display:block;width:22px;height:2px;margin:4px auto;background:var(--theme);transition:transform .2s,opacity .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;z-index:40;background:rgba(4,18,40,.5);opacity:0;visibility:hidden;transition:opacity .25s,visibility .25s}
    .drawer-overlay.open{opacity:1;visibility:visible}
    .mobile-drawer{position:fixed;top:0;right:0;bottom:0;z-index:50;width:min(380px,88vw);overflow:auto;background:#fff;transform:translateX(100%);transition:transform .3s ease;box-shadow:-12px 0 40px rgba(0,0,0,.18)}
    .mobile-drawer.open{transform:translateX(0)}
    .drawer-head{display:flex;align-items:center;gap:15px;padding:22px 20px;border-bottom:1px solid var(--line);color:var(--theme-deep)}
    .drawer-head strong{flex:1}
    .drawer-head a{padding:7px 13px;border-radius:7px;background:var(--theme);color:#fff;font-size:13px}
    .drawer-close{width:32px;height:32px;border:0;background:transparent;color:#718198;font-size:27px;line-height:1;cursor:pointer}
    .drawer-menu{padding:12px 20px 30px}
    .drawer-link,.drawer-toggle{display:block;width:100%;padding:15px 0;border:0;border-bottom:1px solid var(--line);background:transparent;color:#2a3c55;text-align:left;font-weight:600;cursor:pointer}
    .drawer-toggle{position:relative;padding-right:24px}
    .drawer-toggle:after{content:"+";position:absolute;right:4px;color:var(--theme);font-size:20px;font-weight:400}
    .drawer-toggle.active:after{content:"−"}
    .drawer-submenu{display:none;padding:4px 0 8px 15px}
    .drawer-submenu.open{display:block}
    .drawer-submenu a{display:block;padding:8px 0;color:var(--muted);font-size:14px}
    .drawer-submenu a:hover{color:var(--theme)}
    .footer{margin-top:90px;padding:56px 0 20px;background:#071a38;color:#aebed3}
    .footer-grid{display:grid;grid-template-columns:1.7fr 1fr 1fr 1.2fr;gap:40px}
    .footer-brand strong{display:block;margin-bottom:14px;color:#fff;font-size:20px}
    .footer p{margin:0 0 12px;font-size:13px}
    .footer h3{margin:0 0 15px;color:#fff;font-size:15px}
    .footer-grid>div:not(.footer-brand) a,.footer-grid>div:not(.footer-brand)>span{display:block;margin:0 0 9px;color:#aebed3;font-size:13px}
    .footer-grid a:hover{color:#69cef1!important}
    .footer-bottom{display:flex;justify-content:space-between;gap:20px;margin-top:42px;padding-top:18px;border-top:1px solid rgba(255,255,255,.13);font-size:12px}
    .tag-index-page{padding:0 0 10px}
    .tag-hero{position:relative;overflow:hidden;padding:86px 0 72px;background:linear-gradient(135deg,#081a3a 0%,#0b3d91 58%,#116b9a 100%);color:#fff}
    .tag-hero:before,.tag-hero:after{content:"";position:absolute;border:1px solid rgba(143,225,255,.22);border-radius:50%}
    .tag-hero:before{width:460px;height:460px;right:-100px;top:-260px}
    .tag-hero:after{width:620px;height:620px;left:-310px;bottom:-510px}
    .tag-hero .container{position:relative;z-index:1}
    .eyebrow{display:inline-flex;align-items:center;gap:8px;margin-bottom:17px;color:#9be3fa;font-size:13px;font-weight:700;letter-spacing:.12em}
    .eyebrow:before{content:"";width:24px;height:2px;background:#6bd4f3}
    .tag-hero h1{max-width:700px;margin:0 0 15px;font-size:clamp(34px,5vw,58px);line-height:1.15;letter-spacing:-.04em}
    .tag-hero p{max-width:620px;margin:0;color:#c7dcef;font-size:17px}
    .tag-index-content{padding:64px 0 0}
    .content-heading{display:flex;align-items:end;justify-content:space-between;gap:20px;margin-bottom:24px}
    .content-heading h2{margin:0;color:var(--theme-deep);font-size:28px}
    .content-heading p{margin:0;color:var(--muted);font-size:14px}
    .tag-cloud-panel{padding:35px 38px;border:1px solid var(--line);border-radius:20px;background:#fff;box-shadow:var(--shadow)}
    .tag-cloud{display:flex;flex-wrap:wrap;align-items:center;justify-content:center;gap:14px 16px}
    .tag-chip{display:inline-flex;align-items:center;gap:8px;padding:12px 18px;border:1px solid #d6e3f2;border-radius:999px;background:linear-gradient(180deg,#fff,#f4f8fd);color:#36516f;font-size:15px;transition:transform .2s,background .2s,color .2s,box-shadow .2s}
    .tag-chip:hover{transform:translateY(-3px);background:var(--theme);color:#fff;box-shadow:0 10px 22px rgba(11,61,145,.2)}
    .tag-chip small{color:#7b8da4;font-size:11px}
    .tag-chip:hover small{color:#d4f2ff}
    .tag-guide{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:22px}
    .guide-card{padding:23px;border:1px solid var(--line);border-radius:15px;background:#fff}
    .guide-card b{display:flex;align-items:center;justify-content:center;width:34px;height:34px;margin-bottom:12px;border-radius:10px;background:#e4f5fb;color:var(--theme);font-size:15px}
    .guide-card h3{margin:0 0 5px;color:var(--theme-deep);font-size:17px}
    .guide-card p{margin:0;color:var(--muted);font-size:13px}
    @media (max-width:1050px){
      .header-inner{gap:15px}.logo{min-width:165px}.nav-link{padding:0 8px;font-size:14px}.member-link{display:none}
    }
    @media (max-width:800px){
      .container{width:min(100% - 30px,620px)}
      .topbar .container{min-height:34px}.topbar-links{gap:10px}.topbar-links a:first-child{display:none}
      .main-nav{display:none}.header-inner{height:68px}.logo{font-size:17px}.header-btns{margin-left:auto}.hamburger{display:block}
      .mega-menu{width:min(720px,calc(100vw - 30px))}
      .tag-hero{padding:62px 0 54px}.tag-hero p{font-size:15px}
      .tag-index-content{padding-top:42px}.tag-cloud-panel{padding:25px 17px}.content-heading{display:block}.content-heading p{margin-top:6px}
      .tag-guide{grid-template-columns:1fr}
      .footer{margin-top:58px}.footer-grid{grid-template-columns:1fr 1fr;gap:28px 20px}.footer-brand{grid-column:1/-1}.footer-bottom{display:block}.footer-bottom span{display:block;margin-bottom:7px}
    }
    @media (max-width:480px){
      .topbar{font-size:12px}.topbar .container{display:block;padding:6px 0}
      .header-btns{gap:8px}.account-link{padding:8px 11px}
      .tag-hero h1{font-size:36px}.tag-cloud{gap:10px}.tag-chip{padding:10px 14px;font-size:14px}
      .footer-grid{grid-template-columns:1fr}
    }