:root{
    --bs-primary:#212121;
    --bs-warning:#FF9800;
    --font-main:"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
}
body{font-family:var(--font-main);background:#fafafa;color:#333;}
/* 顶部条 */
.topbar{font-size:.85rem;}
/* 导航 */
.navbar-brand span{font-size:1.4rem;letter-spacing:2px;}
.navbar .nav-link{transition:.3s;position:relative;}
.navbar .nav-link::after{
    content:'';position:absolute;width:0;height:2px;bottom:0;left:50%;background:var(--bs-warning);transition:.3s;
}
.navbar .nav-link:hover::after,
.navbar .nav-link.active::after{width:100%;left:0;}
/* 轮播 */
.carousel-caption{background:rgba(0,0,0,.6);border-radius:.5rem;padding:2rem;}
/* 卡片统一高度 */
.card-img-top{height:200px;object-fit:cover;}
/* 时间轴 */
.timeline::before{content:'';position:absolute;left:.75rem;top:0;bottom:0;width:2px;background:#dee2e6;}
.timeline-item{position:relative;}
.timeline-badge{width:14px;height:14px;border:3px solid #fff;box-shadow:0 0 0 3px var(--bs-warning);}
/* 滚动媒体 */
.scrolling-media{white-space:nowrap;}
.scroll-track{animation:scroll 20s linear infinite;}
@keyframes scroll{
    0%{transform:translateX(0);}
    100%{transform:translateX(-50%);}
}
/* 返回顶部 */
#backTop:hover{background:var(--bs-warning);color:#000!important;}
/* 文字行高 */
.line-height-lg{line-height:1.8;}
/* 响应式 */
@media (max-width:768px){
    .navbar-brand span{display:none;}
    .timeline::before{left:.6rem;}
}