/* 移动端导航：原生 details 折叠抽屉，无 JS 依赖 */
.mobile-menu{display:none}.desktop-nav{display:flex}@media(max-width:767px){html,body{overflow-x:hidden}.site-head{overflow:visible}.head-inner{position:relative;min-height:64px;gap:12px}.brand{min-width:0;gap:9px;font-size:15px}.brand img{width:32px;height:32px;flex:0 0 32px}.brand span{min-width:0;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.brand small{max-width:190px;overflow:hidden;text-overflow:ellipsis}.desktop-nav{display:none}.mobile-menu{display:block;margin-left:auto}.mobile-menu summary{display:flex;align-items:center;justify-content:center;gap:8px;min-width:76px;min-height:44px;padding:0 12px;cursor:pointer;list-style:none;border:1px solid #bcdced;border-radius:10px;background:#fff;color:#1b557b;font-size:14px;font-weight:800;user-select:none}.mobile-menu summary::-webkit-details-marker{display:none}.mobile-menu summary i,.mobile-menu summary i:before,.mobile-menu summary i:after{display:block;width:16px;height:2px;border-radius:2px;background:#2a7ba9;transition:transform .2s ease,opacity .2s ease;content:""}.mobile-menu summary i{position:relative}.mobile-menu summary i:before,.mobile-menu summary i:after{position:absolute;left:0}.mobile-menu summary i:before{top:-5px}.mobile-menu summary i:after{top:5px}.mobile-menu[open] summary i{background:transparent}.mobile-menu[open] summary i:before{top:0;transform:rotate(45deg)}.mobile-menu[open] summary i:after{top:0;transform:rotate(-45deg)}.mobile-nav{position:absolute;top:calc(100% + 9px);right:0;z-index:20;display:grid;width:min(320px,calc(100vw - 28px));padding:10px;border:1px solid #bcdced;border-radius:14px;background:#f8fcff;box-shadow:0 16px 34px rgba(31,94,133,.15);transform-origin:top right;animation:mobile-nav-in .2s ease-out}.mobile-nav a{display:flex;align-items:center;min-height:44px;padding:0 13px;border-radius:8px;color:#315c78;font-size:15px}.mobile-nav a:hover,.mobile-nav a:focus-visible,.mobile-nav a.nav-active{background:#e4f3fb;color:#0e4c75;font-weight:800;outline:none}.mobile-nav .button{margin-top:4px;color:#fff;background:var(--blue)}.mobile-nav .button:hover,.mobile-nav .button:focus-visible{color:#fff;background:var(--blue-deep)}.mobile-nav .button:focus-visible{outline:2px solid #77bce4;outline-offset:2px}@keyframes mobile-nav-in{from{opacity:0;transform:translateY(-6px) scale(.98)}to{opacity:1;transform:translateY(0) scale(1)}}.service-map,.error-terminal,.price-wrap{max-width:100%}.hero h1,.contact h2,.support-notice h2,.online-service h2{overflow-wrap:anywhere}}@media(max-width:390px){.brand small{max-width:145px}.mobile-menu summary{min-width:44px;padding:0 11px}.mobile-menu summary span{display:none}}@media(prefers-reduced-motion:reduce){.mobile-menu summary i,.mobile-menu summary i:before,.mobile-menu summary i:after{transition:none}.mobile-nav{animation:none}}