*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-font-smoothing:antialiased}
body{overflow-x:hidden}

/* 导航吸顶 */
#mainNav.scrolled{box-shadow:0 1px 8px rgba(0,0,0,.06);border-color:transparent}

/* 用户菜单 */
.login-in:hover .login-menu{display:block!important}

/* === 导航下划线 === */
.nav-top-link{position:relative}
.nav-top-link::after{content:'';position:absolute;bottom:0;left:50%;transform:translateX(-50%) scaleX(0);width:50%;height:2px;background:#0052D9;transition:transform .25s cubic-bezier(.4,0,.2,1);border-radius:1px}
.nav-item-wrap:hover .nav-top-link::after,.nav-item-wrap.mega-open .nav-top-link::after{transform:translateX(-50%) scaleX(1)}
.nav-item-wrap:hover .nav-top-link,.nav-item-wrap.mega-open .nav-top-link{color:#0052D9}
.nav-item-wrap:hover .nav-arrow{transform:rotate(180deg)}

/* === Mega Menu === */
.mega-menu{display:none;opacity:0;transform:translateY(6px);pointer-events:none;transition:opacity .2s ease,transform .2s ease}
.nav-item-wrap.mega-open .mega-menu{display:block;opacity:1;transform:translateY(0);pointer-events:auto}

/* 左栏分类高亮 */
.mega-cat-item{transition:all .15s ease}
.mega-cat-item.active{background:#fff;color:#0052D9;box-shadow:0 1px 3px rgba(0,0,0,.05);font-weight:500}

/* 角标 */
.nav-badge{position:absolute;top:-10px;right:-20px;font-size:9px;line-height:1;padding:2px 5px;border-radius:3px;white-space:nowrap;font-weight:600}
.nav-badge-hot{background:#fef2f2;color:#ef4444}
.nav-badge-rec{background:#eff6ff;color:#0052D9}
.nav-badge-new{background:#f0fdf4;color:#16a34a}

/* Tab 样式 */
.product-tab{color:#999;background:transparent;border:1px solid transparent;cursor:pointer}
.product-tab:hover{color:#0052D9;background:rgba(0,82,217,.04)}
.product-tab.active{color:#fff;background:#0052D9;border-color:#0052D9}

/* 公告条动画 */
#topNoticeBar{animation:slideDown .3s ease}
@keyframes slideDown{from{transform:translateY(-100%);opacity:0}to{transform:translateY(0);opacity:1}}

/* 回到顶部 */
#backToTop.visible{opacity:1;visibility:visible}

/* 新闻列表项 */
.news-item{display:flex;align-items:center;justify-content:space-between;padding:8px 0;border-bottom:1px solid #f3f4f6}
.news-item:last-child{border-bottom:none}
.news-item .news-title-text{font-size:13px;color:#374151;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;max-width:320px;transition:color .2s}
.news-item .news-title-text:hover{color:#0052D9}
.news-item .news-date{font-size:11px;color:#9ca3af;flex-shrink:0;margin-left:12px}

/* 移动端面板 */
.mobile-panel{transform:translateX(100%);transition:transform .25s ease}
#mobileMenu:not(.hidden) .mobile-panel{transform:translateX(0)}
.mobile-overlay{opacity:0;transition:opacity .25s ease}
#mobileMenu:not(.hidden) .mobile-overlay{opacity:1}
.mobile-arrow.open{transform:rotate(180deg)}

/* 响应式 */
@media(max-width:1024px){.max-w-site{max-width:100%!important}}
@media(max-width:768px){.banner-swiper{border-radius:8px}}