/* ===== USTC 中科大主题 PC ===== */
:root{--c-main:#0071BC;--c-accent:#A4191F;--c-gold:#C9A35F;--c-text:#222;--c-muted:#888;--c-line:#e8eef5;--c-bg:#f8fafc;--c-cream:#fbfaf6}
*{margin:0;padding:0;box-sizing:border-box}
html,body{font-family:"Microsoft YaHei","Helvetica Neue",Arial,sans-serif;color:var(--c-text);line-height:1.6;background:#fff;font-size:14px;overflow-x:hidden}
a{text-decoration:none;color:inherit;transition:color .25s}
a:hover{color:var(--c-main)}
img{max-width:100%;display:block;border:0}
ul,ol,li{list-style:none}
h1,h2,h3,h4,h5,h6{font-weight:600}
.container{width:1200px;max-width:96%;margin:0 auto}

/* 顶栏 */
.ustc-topbar{background:#fff;border-bottom:1px solid #eef2f7;font-size:13px;height:40px;line-height:40px;color:#3a5878}
.ustc-topbar .container{display:flex;justify-content:space-between;align-items:center}
.ustc-topbar .tb-left{display:flex;gap:30px}
.ustc-topbar .tb-left a{color:#3a5878;display:inline-flex;align-items:center;gap:6px;font-size:14px;letter-spacing:1px}
.ustc-topbar .tb-left a:hover{color:var(--c-main)}
.ustc-topbar .tb-left .dot{color:var(--c-main);font-size:12px}
.ustc-topbar .tb-right{display:flex;align-items:center;gap:14px}
.ustc-topbar .tb-search{display:flex;align-items:center;border:1px solid #d8e0eb;background:#fff;height:26px}
.ustc-topbar .tb-search input[type=text]{border:0;outline:none;background:transparent;padding:0 10px;width:170px;height:24px;font-size:13px;color:#3a5878}
.ustc-topbar .tb-search button{border:0;background:transparent;color:#3a5878;width:30px;height:24px;cursor:pointer;display:flex;align-items:center;justify-content:center;border-left:1px solid #eef2f7}
.ustc-topbar .tb-search button:hover{color:var(--c-main)}
.ustc-topbar .tb-en{background:var(--c-main);color:#fff !important;padding:0 16px;height:26px;line-height:26px;font-size:13px;letter-spacing:1px}
.ustc-topbar .tb-en:hover{background:var(--c-accent);color:#fff}

/* 主头部 */
.ustc-header{position:relative;background:linear-gradient(180deg,#f4f8fc 0%,#e6eff7 100%);padding:34px 0 28px;overflow:hidden}
.ustc-header .container{position:relative;display:flex;justify-content:space-between;align-items:center;z-index:2}
.ustc-header .logo{display:flex;align-items:center;gap:18px}
.ustc-header .logo img{height:90px;width:auto}
.ustc-header .logo h1{font-size:38px;color:var(--c-main);letter-spacing:6px;font-weight:700;font-family:"STKaiti","KaiTi","楷体",serif;line-height:1.2}
.ustc-header .logo p{font-size:14px;color:var(--c-main);font-style:italic;letter-spacing:1px;margin-top:6px;font-family:"Times New Roman",serif;font-weight:600;opacity:.85}
.ustc-header .motto{position:relative;color:var(--c-main);font-size:18px;letter-spacing:8px;font-weight:600;display:flex;align-items:center;gap:6px;z-index:3;text-shadow:0 1px 0 rgba(255,255,255,.6)}
.ustc-header .motto span{display:inline-block}
.ustc-header .motto .sep{font-style:normal;color:var(--c-gold);font-size:22px;margin:0 8px}
.ustc-header .globe{position:absolute;right:-60px;top:50%;transform:translateY(-50%);width:340px;height:340px;border-radius:50%;background:radial-gradient(circle at 35% 35%,#a8d4f5 0%,#6aa9d8 35%,#2c6da3 70%,#0e3e6b 100%);box-shadow:inset -20px -20px 60px rgba(0,30,60,.4),0 6px 30px rgba(0,113,188,.25);opacity:.85;z-index:1;pointer-events:none}
.ustc-header .globe:before{content:"";position:absolute;left:-60px;top:30%;width:140%;height:8px;background:linear-gradient(90deg,transparent,rgba(255,255,255,.85),transparent);transform:rotate(-22deg);filter:blur(1px)}
.ustc-header .globe:after{content:"";position:absolute;right:-30px;top:8%;width:90%;height:4px;background:linear-gradient(90deg,transparent,rgba(255,255,255,.7),transparent);transform:rotate(-32deg);filter:blur(.5px)}

/* 主导航 */
.ustc-nav{background:#fff;border-bottom:1px solid #eef2f7;box-shadow:0 4px 14px rgba(0,113,188,.06);position:relative;z-index:5}
.ustc-nav ul{display:flex;flex-wrap:wrap;justify-content:flex-start;align-items:center}
.ustc-nav li{flex:1 1 auto;text-align:center;position:relative;min-width:100px}
.ustc-nav li a{display:block;padding:18px 12px;color:#1a3a5c;font-size:15px;letter-spacing:1px;font-weight:500;position:relative}
.ustc-nav li a:after{content:"";position:absolute;left:50%;bottom:8px;width:0;height:2px;background:var(--c-main);transition:.3s;transform:translateX(-50%)}
.ustc-nav li:hover>a{color:var(--c-main);background:transparent}
.ustc-nav li:hover>a:after,.ustc-nav li.active>a:after{width:60%}
.ustc-nav li.active>a{color:var(--c-main);background:transparent}

/* 通用 section */
.section{padding:50px 0}
.section.cream{background:var(--c-cream)}
.section-title{display:flex;justify-content:space-between;align-items:flex-end;border-bottom:2px solid var(--c-main);padding-bottom:14px;margin-bottom:30px;position:relative}
.section-title:before{content:"";position:absolute;left:0;bottom:-2px;width:80px;height:2px;background:var(--c-accent)}
.section-title h2{font-size:24px;color:var(--c-main);font-weight:700;letter-spacing:2px}
.section-title h2 em{font-style:normal;color:var(--c-muted);font-size:14px;font-weight:400;letter-spacing:1px;margin-left:10px}
.section-title .more{font-size:13px;color:var(--c-muted)}
.section-title .more:hover{color:var(--c-main)}

/* 1. 轮播 */
.ustc-slide{position:relative}
.ustc-slide .swiper-container{width:100%;height:480px}
.ustc-slide .swiper-slide img,.ustc-slide .swiper-slide a img{width:100%;height:100%;object-fit:cover}
.ustc-slide .swiper-pagination{bottom:18px}
.ustc-slide .swiper-pagination-bullet{background:rgba(255,255,255,.6);width:10px;height:10px;opacity:1}
.ustc-slide .swiper-pagination-bullet-active{background:var(--c-gold)}

/* 2. 科大要闻 ustc-news */
.ustc-news{display:grid;grid-template-columns:600px 1fr;gap:30px}
.ustc-news .headline{display:block;background:#fff;border:1px solid var(--c-line);overflow:hidden;transition:.3s}
.ustc-news .headline:hover{box-shadow:0 6px 22px rgba(0,113,188,.15);transform:translateY(-2px)}
.ustc-news .headline .pic{height:340px;overflow:hidden;background:#eee}
.ustc-news .headline .pic img{width:100%;height:100%;object-fit:cover;transition:transform .5s}
.ustc-news .headline:hover .pic img{transform:scale(1.05)}
.ustc-news .headline h3{font-size:18px;color:var(--c-text);padding:14px 18px 8px;line-height:1.5;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.ustc-news .headline p{color:var(--c-muted);font-size:13px;padding:0 18px;line-height:1.7;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.ustc-news .headline .date{display:block;padding:10px 18px 14px;color:var(--c-accent);font-size:12px}
.ustc-news .list li{display:flex;gap:14px;padding:14px 0;border-bottom:1px dashed var(--c-line);align-items:center}
.ustc-news .list li:last-child{border-bottom:0}
.ustc-news .list .date{flex-shrink:0;width:60px;text-align:center;border-right:1px solid var(--c-line);padding-right:10px}
.ustc-news .list .date .d{display:block;color:var(--c-main);font-size:24px;font-weight:700;line-height:1.1}
.ustc-news .list .date .m{display:block;color:var(--c-muted);font-size:11px;margin-top:2px}
.ustc-news .list h4{flex:1;font-size:15px;font-weight:500;line-height:1.5;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}

/* 3. 专题 ustc-topics */
.ustc-topics{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.ustc-topics .card{position:relative;display:block;height:200px;overflow:hidden;background:#222}
.ustc-topics .card img{width:100%;height:100%;object-fit:cover;opacity:.85;transition:.5s}
.ustc-topics .card:hover img{transform:scale(1.06);opacity:1}
.ustc-topics .card .mask{position:absolute;left:0;right:0;bottom:0;padding:14px 16px;color:#fff;background:linear-gradient(180deg,transparent,rgba(0,0,0,.7))}
.ustc-topics .card h3{font-size:15px;line-height:1.4;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.ustc-topics .card p{font-size:12px;color:rgba(255,255,255,.7);margin-top:4px}

/* 4. 通知公告 ustc-twocol */
.ustc-twocol{display:grid;grid-template-columns:1fr 1fr;gap:30px}
.ustc-twocol .col{background:#fff;border:1px solid var(--c-line);padding:0}
.ustc-twocol .col-head{display:flex;justify-content:space-between;align-items:center;padding:14px 22px;border-bottom:2px solid var(--c-main);background:linear-gradient(90deg,#f0f7fc,#fff)}
.ustc-twocol .col-head h3{font-size:17px;color:var(--c-main);font-weight:700;letter-spacing:1px}
.ustc-twocol .col-head h3 em{font-style:normal;color:var(--c-muted);font-size:12px;margin-left:8px}
.ustc-twocol .col-head a{font-size:12px;color:var(--c-muted)}
.ustc-twocol .col-head a:hover{color:var(--c-main)}
.ustc-twocol .col .top{display:flex;gap:14px;padding:16px 22px;border-bottom:1px dashed var(--c-line);align-items:flex-start}
.ustc-twocol .col .top .pic{flex-shrink:0;width:160px;height:100px;overflow:hidden;background:#f5f5f5}
.ustc-twocol .col .top .pic img{width:100%;height:100%;object-fit:cover;transition:transform .4s}
.ustc-twocol .col .top:hover .pic img{transform:scale(1.05)}
.ustc-twocol .col .top .txt{flex:1;min-width:0}
.ustc-twocol .col .top .txt h4{font-size:15px;line-height:1.5;margin-bottom:6px;color:var(--c-text);display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.ustc-twocol .col .top .txt h4 a{color:var(--c-text)}
.ustc-twocol .col .top .txt h4 a:hover{color:var(--c-main)}
.ustc-twocol .col .top .txt p{font-size:12px;color:var(--c-muted);line-height:1.6;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.ustc-twocol .col ul{padding:14px 22px 18px}
.ustc-twocol .col li{display:flex;align-items:center;padding:9px 0;border-bottom:1px dashed var(--c-line);font-size:14px}
.ustc-twocol .col li:last-child{border-bottom:0}
.ustc-twocol .col li:before{content:"";width:5px;height:5px;background:var(--c-gold);border-radius:50%;margin-right:10px;flex-shrink:0}
.ustc-twocol .col li a{flex:1;color:var(--c-text);overflow:hidden;white-space:nowrap;text-overflow:ellipsis}
.ustc-twocol .col li a:hover{color:var(--c-main)}

/* 5. 媒体科大 ustc-pic-video */
.ustc-pic-video{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.ustc-pic-video .card{display:block;background:#fff;border:1px solid var(--c-line);overflow:hidden;transition:.3s}
.ustc-pic-video .card:hover{box-shadow:0 6px 22px rgba(0,113,188,.15);transform:translateY(-3px)}
.ustc-pic-video .card img{width:100%;height:160px;object-fit:cover;background:#eee;transition:transform .5s}
.ustc-pic-video .card:hover img{transform:scale(1.05)}
.ustc-pic-video .card span{display:block;padding:12px 14px;font-size:14px;color:var(--c-text);line-height:1.5;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;min-height:62px}

/* 6. 院系 ustc-colleges */
.ustc-colleges{display:grid;grid-template-columns:repeat(6,1fr);gap:14px}
.ustc-colleges a{display:flex;align-items:center;gap:10px;padding:14px 16px;background:#fff;border:1px solid var(--c-line);border-left:3px solid var(--c-main);font-size:14px;color:var(--c-text);transition:.3s}
.ustc-colleges a:hover{background:var(--c-main);color:#fff;border-left-color:var(--c-gold);box-shadow:0 4px 14px rgba(0,113,188,.2)}
.ustc-colleges a:hover .ico{background:var(--c-gold);color:#fff}
.ustc-colleges a .ico{flex-shrink:0;width:30px;height:30px;line-height:30px;text-align:center;background:#f0f7fc;color:var(--c-main);font-size:14px;font-weight:700;border-radius:3px;transition:.3s}

/* 7. 数字科大 ustc-stats */
.ustc-stats{padding:60px 0;background:linear-gradient(135deg,var(--c-main),#003f6e);color:#fff;text-align:center}
.ustc-stats h2{font-size:26px;letter-spacing:3px;margin-bottom:6px}
.ustc-stats h2 em{font-style:normal;color:rgba(255,255,255,.6);font-size:14px;letter-spacing:1px;margin-left:10px}
.ustc-stats .subtitle{color:rgba(255,255,255,.7);font-size:14px;letter-spacing:6px;margin-bottom:36px}
.ustc-stats .grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.ustc-stats .stat{padding:24px 10px;border-left:1px solid rgba(255,255,255,.2)}
.ustc-stats .stat:first-child{border-left:0}
.ustc-stats .stat .n{font-size:48px;font-weight:700;color:var(--c-gold);font-family:"Times New Roman",serif;line-height:1.1}
.ustc-stats .stat .n .u{font-size:18px;color:#fff;margin-left:4px;font-weight:400}
.ustc-stats .stat .label{margin-top:8px;font-size:14px;letter-spacing:2px}

/* 8. 服务直通车 ustc-quick */
.ustc-quick{display:grid;grid-template-columns:repeat(8,1fr);gap:14px}
.ustc-quick a{display:flex;flex-direction:column;align-items:center;gap:8px;padding:18px 6px;background:#fff;border:1px solid var(--c-line);font-size:13px;color:var(--c-text);text-align:center;transition:.3s}
.ustc-quick a:hover{background:var(--c-accent);color:#fff;border-color:var(--c-accent);transform:translateY(-3px);box-shadow:0 6px 16px rgba(164,25,31,.2)}
.ustc-quick a .ico{width:42px;height:42px;line-height:42px;text-align:center;background:linear-gradient(135deg,var(--c-main),#005a99);color:#fff;font-size:18px;font-weight:700;border-radius:50%}
.ustc-quick a:hover .ico{background:#fff;color:var(--c-accent)}

/* 友情链接 */
.flinks{background:#003f6e;padding:20px 0;color:#cfe6ff;overflow:hidden;font-size:14px}
.flinks .container{line-height:32px}
.flinks .label{display:inline-block;color:var(--c-gold);font-size:15px;font-weight:700;margin-right:24px;vertical-align:middle}
.flinks ul{display:inline;padding:0;margin:0;list-style:none}
.flinks ul li{display:inline-block;vertical-align:middle;margin:0;padding:0}
.flinks ul li a{display:inline-block;padding:0 20px;color:#cfe6ff;font-size:14px;line-height:1.2;border-right:1px solid rgba(255,255,255,.25)}
.flinks ul li:last-child a{border-right:0}
.flinks ul li a:hover{color:#fff}

/* 主页脚 */
.ustc-footer{background:#0a2540;color:#a8c4dc;padding:40px 0 0;overflow:hidden}
.ustc-footer .ft-top{display:grid;grid-template-columns:280px minmax(0,1fr) 140px;gap:30px;padding-bottom:30px;border-bottom:1px solid #1f3a5a}
.ustc-footer .ft-info{min-width:0}
.ustc-footer .ft-logo{display:flex;align-items:center;gap:12px;margin-bottom:14px}
.ustc-footer .ft-logo img{height:40px}
.ustc-footer .ft-logo h2{color:#fff;font-size:18px}
.ustc-footer .ft-motto{color:var(--c-gold);font-size:14px;letter-spacing:2px;margin-bottom:10px}
.ustc-footer .ft-info p{font-size:13px;line-height:2;word-break:break-all}
.ustc-footer .ft-cols{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:20px;min-width:0}
.ustc-footer .ft-col{min-width:0}
.ustc-footer .ft-col h4{font-size:14px;color:#fff;margin-bottom:10px;letter-spacing:1px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.ustc-footer .ft-col h4 a{color:#fff}
.ustc-footer .ft-link{display:block;font-size:12px;color:#7a98b5;line-height:2;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;max-width:100%}
.ustc-footer .ft-link:hover{color:var(--c-gold)}
.ustc-footer .ft-qr{text-align:center;min-width:0}
.ustc-footer .ft-qr img{width:100px;height:100px;background:#fff;padding:6px;margin:0 auto}
.ustc-footer .ft-qr p{font-size:12px;margin-top:6px}
.ustc-footer .ft-bottom{padding:18px 0;text-align:center;font-size:12px;color:#7a98b5}
.ustc-footer .ft-bottom p{line-height:2;margin:0}
.ustc-footer .ft-bottom a{color:var(--c-gold)}
.ustc-footer .ft-bottom a:hover{color:#fff}
.ustc-footer .ft-bottom strong{color:#fff;margin:0 4px}

/* 列表/内容/标签云页公共 */
.arc-list{background:#fff;padding:24px 28px;border:1px solid var(--c-line)}
.arc-list li{display:flex;align-items:center;padding:14px 0;border-bottom:1px dashed var(--c-line)}
.arc-list li:last-child{border-bottom:0}
.arc-list li:before{content:"";width:5px;height:5px;background:var(--c-gold);border-radius:50%;margin-right:12px;flex-shrink:0}
.arc-list li a{flex:1;font-size:15px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.arc-list li .date{color:var(--c-muted);font-size:12px;margin-left:12px;flex-shrink:0;font-family:"Times New Roman",serif}
.arc-detail{background:#fff;padding:30px 36px;border:1px solid var(--c-line)}
.arc-detail .title{font-size:28px;color:var(--c-text);text-align:center;padding:10px 0 20px;border-bottom:1px dashed var(--c-line)}
.arc-detail .meta{text-align:center;padding:16px 0;color:var(--c-muted);font-size:13px;border-bottom:1px solid var(--c-line)}
.arc-detail .meta span{margin:0 10px}
.arc-detail .body{padding:24px 0;font-size:15px;line-height:2;color:var(--c-text)}
.arc-detail .body p{margin-bottom:14px}
.arc-detail .body img{max-width:100%;height:auto;display:block;margin:14px auto}
.arc-detail .tags{margin-top:24px;padding-top:18px;border-top:1px dashed var(--c-line);font-size:13px}
.arc-detail .tags strong{color:var(--c-main);margin-right:8px}
.arc-detail .tags a{display:inline-block;padding:2px 10px;background:#f0f7fc;color:var(--c-main);margin:3px 6px 3px 0;border:1px solid var(--c-line);font-size:12px}
.arc-detail .tags a:hover{background:var(--c-main);color:#fff}
.arc-detail .prev-next{margin-top:22px;padding-top:18px;border-top:1px dashed var(--c-line);font-size:13px}
.arc-detail .prev-next div{padding:6px 0}

.tag-cloud{padding:10px 0}
.tag-cloud li{display:inline-block;margin:5px 6px}
.tag-cloud li a{display:inline-block;padding:6px 14px;background:#f0f7fc;color:var(--c-main);border:1px solid var(--c-line);font-size:13px}
.tag-cloud li a:hover{background:var(--c-main);color:#fff;border-color:var(--c-main)}

/* 防 grid 子项溢出（五件套）*/
.ustc-news .list,.ustc-twocol .col,.ustc-topics .card,.ustc-pic-video .card,.ustc-colleges a,.ustc-stats .stat{min-width:0}
.ustc-twocol .col,.ustc-topics .card,.ustc-pic-video .card{overflow:hidden}
.ustc-twocol ul,.ustc-news ul{min-width:0}
.ustc-twocol li a,.ustc-news .list h4 a{display:block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;max-width:100%}

/* 响应式收缩 */
@media screen and (max-width:1240px){
  .container{width:96%}
  .ustc-news{grid-template-columns:480px 1fr}
}
@media screen and (max-width:980px){
  .ustc-news{grid-template-columns:1fr}
  .ustc-news .headline .pic{height:240px}
  .ustc-pic-video,.ustc-topics{grid-template-columns:repeat(2,1fr)}
  .ustc-colleges{grid-template-columns:repeat(3,1fr)}
  .ustc-quick{grid-template-columns:repeat(4,1fr)}
  .ustc-twocol{grid-template-columns:1fr}
  .ustc-footer .ft-top{grid-template-columns:1fr}
  .ustc-footer .ft-cols{grid-template-columns:repeat(2,1fr)}
}