/* ========== Reset & Variables ========== */
*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
:root{
  --primary:#1B3F6B;
  --primary-dark:#0F2A4A;
  --primary-light:#2A5A8E;
  --gold:#C4982F;
  --gold-light:#E5C76B;
  --red:#C8102E;
  --bg:#F5F6FA;
  --white:#FFFFFF;
  --text:#2D2D2D;
  --text-mid:#555555;
  --text-light:#888888;
  --border:#E0E0E0;
  --shadow:0 2px 12px rgba(0,0,0,.08);
  --shadow-hover:0 4px 20px rgba(0,0,0,.12);
  --radius:6px;
  --max-w:1200px;
}
body{font-family:"Microsoft YaHei","PingFang SC","Helvetica Neue",Arial,sans-serif;font-size:14px;color:var(--text);background:var(--bg);line-height:1.6;overflow-x:hidden}
a{color:inherit;text-decoration:none;transition:color .3s}
a:hover{color:var(--gold)}
img{display:block;max-width:100%}
ul,ol{list-style:none}
.wrap{max-width:var(--max-w);margin:0 auto;padding:0 20px}

/* ========== Top Bar ========== */
.topbar{background:var(--primary-dark);color:rgba(255,255,255,.8);font-size:14px;height:36px;line-height:36px}
.topbar .wrap{display:flex;justify-content:space-between;align-items:center}
.topbar a{color:rgba(255,255,255,.7);display:inline-flex;align-items:center;gap:4px}
.topbar a:hover{color:var(--gold-light)}
.topbar .links span{color:rgba(255,255,255,.3);margin:0 8px}

/* ========== Header ========== */
.header{background:var(--white);padding:18px 0;box-shadow:0 1px 4px rgba(0,0,0,.06);position:relative;z-index:100}
.header .wrap{display:flex;align-items:center;gap:16px}
.header .logo-area{display:flex;align-items:center;gap:14px;flex-shrink:0}
.header .logo img{height: 80px;width:auto;display:block}
.header .title-area h1{font-size:26px;color:var(--primary);font-weight:700;letter-spacing:2px;line-height:1.3}
.header .title-area .en{font-size:12px;color:var(--text-light);letter-spacing:1px;/* text-transform:uppercase; */margin-top:2px}
.header .badge{margin-left:auto;display:flex;gap:10px;align-items:center}
.header .badge-item{background:linear-gradient(135deg,var(--gold),var(--gold-light));color:#fff;padding:6px 14px;border-radius:20px;font-size:14px;font-weight:600;white-space:nowrap}
.header .badge-item.blue{background:linear-gradient(135deg,var(--primary),var(--primary-light))}

/* ========== Navigation ========== */
.nav{background:linear-gradient(90deg,#1B3F6B,#2A5A8E);height:50px;position:relative;z-index:99;box-shadow:0 2px 8px rgba(27,63,107,.3)}
.nav .wrap{display:flex;align-items:center;height:100%}
.nav ul.nav-list{display:flex;width:100%;list-style:none;margin:0;padding:0}
.nav ul.nav-list > li{flex:1 1 auto;position:relative;text-align:center}
.nav ul.nav-list > li > a{display:block;color:#ffffff;font-size:18px;font-weight:500;line-height:50px;padding:0 4px;white-space:nowrap;transition:background .3s;position:relative;text-decoration:none}
.nav ul.nav-list > li > a:hover,.nav ul.nav-list > li.active > a{background:rgba(0,0,0,.15);color:#fff}
.nav ul.nav-list > li.active > a::after{content:'';position:absolute;bottom:0;left:50%;transform:translateX(-50%);width:30px;height:3px;background:#C4982F;border-radius:2px}
.nav ul.nav-list .dropdown{position:absolute;top:50px;left:0;min-width:200px;background:rgba(255,255,255,.98);box-shadow:0 4px 20px rgba(0,0,0,.15);border-radius:0 0 6px 6px;opacity:0;visibility:hidden;transform:translateY(10px);transition:all .3s;z-index:100;text-align:left;padding:0;list-style:none}
.nav ul.nav-list > li:hover .dropdown{opacity:1;visibility:visible;transform:translateY(0)}
.nav ul.nav-list .dropdown li a{display:block;padding:10px 18px;font-size:15px;color:#2D2D2D;border-bottom:1px solid #E0E0E0;line-height:1.5;text-decoration:none}
.nav ul.nav-list .dropdown li:last-child a{border-bottom:none}
.nav ul.nav-list .dropdown li a:hover{background:#F5F6FA;color:#1B3F6B;padding-left:22px}
/* 右侧菜单的下拉右对齐，避免超出视口 */
.nav ul.nav-list > li:nth-last-child(-n+3) .dropdown{left:auto;right:0}

/* 汉堡按钮（桌面端隐藏，≤992px 显示） */
.nav-toggle{display:none;position:relative;z-index:10}

/* ========== Banner ========== */
.banner{position:relative;height:420px;overflow:hidden;background:var(--primary-dark)}
.banner .slides{position:relative;width:100%;height:100%}
.banner .slide{position:absolute;top:0;left:0;width:100%;height:100%;opacity:0;transition:opacity 1s ease-in-out}
.banner .slide.active{opacity:1}
.banner .slide img{width:100%;height:100%;object-fit:cover}
.banner .slide::after{content:'';position:absolute;top:0;left:0;width:100%;height:100%;background:linear-gradient(90deg,rgba(15,42,74,.7) 0%,rgba(15,42,74,.3) 50%,transparent 100%)}
.banner .overlay{position:absolute;top:50%;left:0;transform:translateY(-50%);z-index:10;padding:0 5%;max-width:800px}
.banner .overlay h2{color:#fff;font-size:36px;font-weight:700;margin-bottom:12px;text-shadow:0 2px 8px rgba(0,0,0,.3);line-height:1.3}
.banner .overlay p{color:rgba(255,255,255,.85);font-size:16px;line-height:1.8;text-shadow:0 1px 4px rgba(0,0,0,.3)}
.banner .overlay .tag{display:inline-block;background:var(--gold);color:#fff;padding:4px 14px;border-radius:3px;font-size:15px;font-weight:600;margin-bottom:16px}
.banner .dots{position:absolute;bottom:24px;left:50%;transform:translateX(-50%);display:flex;gap:8px;z-index:10}
.banner .dots span{width:10px;height:10px;border-radius:50%;background:rgba(255,255,255,.4);cursor:pointer;transition:all .3s}
.banner .dots span.active{background:var(--gold);width:28px;border-radius:5px}

/* ========== Quick Nav Cards ========== */
.quick-nav{margin-top:-40px;position:relative;z-index:20;padding-bottom:20px}
.quick-nav .wrap{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.quick-card{background:#fff;border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow-hover);transition:transform .3s,box-shadow .3s;cursor:pointer}
.quick-card:hover{transform:translateY(-4px);box-shadow:0 8px 30px rgba(0,0,0,.15)}
.quick-card .img{height:160px;overflow:hidden;position:relative}
.quick-card .img img{width:100%;height:100%;object-fit:cover;transition:transform .5s}
.quick-card:hover .img img{transform:scale(1.05)}
.quick-card .img::after{content:'';position:absolute;top:0;left:0;width:100%;height:100%;background:linear-gradient(to top,rgba(27,63,107,.4),transparent)}
.quick-card .body{padding:18px 20px;text-align:center}
.quick-card .body h3{font-size:17px;color:var(--primary);margin-bottom:6px}
.quick-card .body p{font-size:14px;color:var(--text-light)}
.quick-card .body .arrow{display:inline-block;margin-top:8px;color:var(--gold);font-size:15px;font-weight:600}
.quick-card .corner{position:absolute;top:12px;right:12px;background:var(--gold);color:#fff;width:32px;height:32px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:14px;font-weight:700;z-index:5}

/* ========== Quick Nav Cards (No Image) ========== */
.quick-nav .quick-card.no-img{display:flex;flex-direction:column}
.quick-nav .quick-card.no-img .icon-box{height:120px;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,var(--primary),var(--primary-light));position:relative}
.quick-nav .quick-card.no-img:nth-child(2) .icon-box{background:linear-gradient(135deg,#B8860B,var(--gold))}
.quick-nav .quick-card.no-img:nth-child(3) .icon-box{background:linear-gradient(135deg,#1B6B42,#2A8659)}
.quick-nav .quick-card.no-img .icon-box .big-char{font-size:48px;color:rgba(255,255,255,.9);font-weight:700}
.quick-nav .quick-card.no-img .icon-box .corner{position:absolute;top:10px;right:10px}
.quick-nav .quick-card.no-img .body{padding:18px 20px;text-align:center}
.quick-nav .quick-card.no-img .body h3{font-size:17px;color:var(--primary);margin-bottom:6px}
.quick-nav .quick-card.no-img .body p{font-size:14px;color:var(--text-light);line-height:1.6}
.quick-nav .quick-card.no-img .body .arrow{display:inline-block;margin-top:8px;color:var(--gold);font-size:15px;font-weight:600}

/* ========== Section ========== */
.section{padding:36px 0}
.section.bg-white{background:#fff}
.section-head{display:flex;justify-content:space-between;align-items:flex-end;margin-bottom:24px;padding-bottom:12px;border-bottom:2px solid var(--border)}
.section-head .title{display:flex;align-items:center;gap:10px}
.section-head .title .bar{width:4px;height:24px;background:var(--gold);border-radius:2px}
.section-head .title h2{font-size:22px;color:var(--primary);font-weight:700}
.section-head .title .en{font-size:12px;color:var(--text-light);text-transform:uppercase;margin-left:8px}
.section-head .more{font-size:15px;color:var(--text-light);display:flex;align-items:center;gap:4px}
.section-head .more:hover{color:var(--gold)}

/* ========== About ========== */
.about-section{display:grid;grid-template-columns:1.2fr 1fr;gap:30px;align-items:center}
.about-text p{font-size:14px;color:var(--text-mid);line-height:2;margin-bottom:12px;text-indent:2em}
.about-text .highlight{color:var(--primary);font-weight:600}
.about-text .tags{display:flex;gap:8px;flex-wrap:wrap;margin-top:16px}
.about-text .tags span{background:var(--bg);color:var(--primary);padding:5px 14px;border-radius:3px;font-size:14px;border:1px solid var(--border)}
.about-img{position:relative;border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow)}
.about-img img{width:100%;height:300px;object-fit:cover}
.about-img .float-card{position:absolute;bottom:20px;left:20px;right:20px;background:rgba(255,255,255,.95);backdrop-filter:blur(10px);padding:16px 20px;border-radius:var(--radius);box-shadow:var(--shadow)}
.about-img .float-card h4{font-size:15px;color:var(--primary);margin-bottom:4px}
.about-img .float-card p{font-size:14px;color:var(--text-light)}

/* ========== News & Announcements ========== */
.news-bg-section{position:relative;overflow:hidden;background:#fff}
.news-bg-section::before{content:'';position:absolute;top:0;left:0;right:0;bottom:0;filter:blur(6px);opacity:.22;transform:scale(1.08);z-index:0}
.news-bg-section::after{content:'';position:absolute;top:0;left:0;right:0;bottom:0;background:linear-gradient(180deg,rgba(255,255,255,.55),rgba(255,255,255,.7));z-index:0}
.news-bg-section .wrap{position:relative;z-index:1}
.news-bg-section .news-feature{background:rgba(255,255,255,.85);backdrop-filter:blur(4px)}
.news-section{display:grid;/*grid-template-columns:1fr 1fr;*/gap:30px}
.news-section > div{min-width:0}
.news-list .item{display:flex;gap:14px;padding:14px 0;border-bottom:1px dashed var(--border);align-items:flex-start}
.news-list .item .date{flex-shrink:0;background:var(--bg);border-radius:4px;padding:6px 10px;display:flex;align-items:center;justify-content:center;font-size:15px;font-weight:700;color:var(--primary);line-height:1.4;white-space:nowrap}
.news-list .item .info{flex:1;min-width:0}
.news-list .item .info h4{font-size:16px;color:var(--text);font-weight:500;margin-bottom:4px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.news-list .item .info h4:hover{color:var(--primary)}
.news-list .item .info p{font-size:14px;color:var(--text-light);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.news-list .item:first-child{padding-top:0}
.news-list .item:last-child{border-bottom:none}

.news-feature{background:var(--bg);border-radius:var(--radius);overflow:hidden;padding:0}
.news-feature .img{height:200px;overflow:hidden}
.news-feature .img img{width:100%;height:100%;object-fit:cover}
.news-feature .body{padding:16px 20px}
.news-feature .body h4{font-size:16px;color:var(--primary);font-weight:600;margin-bottom:6px;line-height:1.5}
.news-feature .body p{font-size:14px;color:var(--text-light);line-height:1.8;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}

/* ========== Party Building ========== */
.party-grid{display:grid;grid-template-columns:1fr 1fr 1fr;gap:20px}
.party-card{background:#fff;border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;transition:all .3s}
.party-card:hover{border-color:var(--gold);box-shadow:var(--shadow)}
.party-card .img{height:140px;overflow:hidden;position:relative}
.party-card .img img{width:100%;height:100%;object-fit:cover}
.party-card .img .label{position:absolute;top:10px;left:10px;background:var(--red);color:#fff;padding:3px 10px;border-radius:3px;font-size:12px}
.party-card .body{padding:14px 16px}
.party-card .body h4{font-size:16px;color:var(--text);margin-bottom:6px;font-weight:600;display: -webkit-box;-webkit-box-orient: vertical;-webkit-line-clamp: 2;overflow: hidden;text-overflow: ellipsis;}
.party-card .body p{font-size:14px;color:var(--text-light);line-height:1.7;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}

/* ========== Education ========== */
.edu-section{display:grid;grid-template-columns:1fr 1fr;gap:30px}
.edu-card{background:linear-gradient(135deg,var(--primary),var(--primary-light));border-radius:var(--radius);padding:28px 30px;color:#fff;position:relative;overflow:hidden}
.edu-card.gold{background:linear-gradient(135deg,#B8860B,var(--gold))}
.edu-card::after{content:'';position:absolute;top:-30px;right:-30px;width:120px;height:120px;border-radius:50%;background:rgba(255,255,255,.08)}
.edu-card .icon{font-size:32px;margin-bottom:12px}
.edu-card h3{font-size:18px;margin-bottom:8px}
.edu-card .desc{font-size:15px;opacity:.85;line-height:1.8;margin-bottom:14px}
.edu-card .majors{display:flex;flex-wrap:wrap;gap:6px}
.edu-card .majors span{background:rgba(255,255,255,.15);padding:4px 12px;border-radius:3px;font-size:12px}
.edu-card .stat{display:flex;gap:20px;margin-top:14px;padding-top:14px;border-top:1px solid rgba(255,255,255,.15)}
.edu-card .stat .num{font-size:24px;font-weight:700;color:var(--gold-light)}
.edu-card.gold .stat .num{color:#fff}
.edu-card .stat .label{font-size:14px;opacity:.7}

/* ========== Research Platforms ========== */
.platform-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.platform-card{background:#fff;border-radius:var(--radius);padding:20px 16px;text-align:center;transition:all .3s;border:2px solid transparent;cursor:pointer}
.platform-card:hover{border-color:var(--gold);transform:translateY(-3px);box-shadow:var(--shadow)}
.platform-card .icon-circle{width:56px;height:56px;margin:0 auto 12px;border-radius:50%;background:linear-gradient(135deg,var(--primary-light),var(--primary));display:flex;align-items:center;justify-content:center;font-size:24px}
.platform-card:nth-child(2) .icon-circle{background:linear-gradient(135deg,var(--gold),#B8860B)}
.platform-card:nth-child(3) .icon-circle{background:linear-gradient(135deg,#2A8659,#1B6B42)}
.platform-card:nth-child(4) .icon-circle{background:linear-gradient(135deg,#8B4513,#A0522D)}
.platform-card h4{font-size:15px;color:var(--primary);line-height:1.5;font-weight:600;margin-bottom:6px}
.platform-card p{font-size:14px;color:var(--text-light);line-height:1.5}

/* ========== Discipline ========== */
.discipline-list{display:grid;grid-template-columns:repeat(5,1fr);gap:14px}
.discipline-item{background:#fff;border-radius:var(--radius);padding:20px 14px;text-align:center;border:1px solid var(--border);transition:all .3s}
.discipline-item:hover{border-color:var(--primary);box-shadow:var(--shadow);transform:translateY(-2px)}
.discipline-item .rank{display:inline-block;background:var(--gold);color:#fff;font-size:14px;padding:2px 10px;border-radius:10px;margin-bottom:10px;font-weight:600}
.discipline-item h4{font-size:14px;color:var(--primary);margin-bottom:6px;font-weight:600}
.discipline-item p{font-size:14px;color:var(--text-light)}

/* ========== Gallery ========== */
.gallery{display:grid;grid-template-columns:repeat(5,1fr);gap:10px}
.gallery-item{height:140px;overflow:hidden;border-radius:var(--radius);position:relative;cursor:pointer}
.gallery-item:first-child{grid-column:span 2;grid-row:span 2;height:auto}
.gallery-item img{width:100%;height:100%;object-fit:cover;transition:transform .5s}
.gallery-item:hover img{transform:scale(1.08)}
.gallery-item .caption{position:absolute;bottom:0;left:0;right:0;background:linear-gradient(transparent,rgba(0,0,0,.7));color:#fff;padding:20px 12px 10px;font-size:14px;opacity:0;transition:opacity .3s}
.gallery-item:hover .caption{opacity:1}

/* ========== Triple Column (学部风采/学术讲座/人才招聘) ========== */
.triple-col{display:grid;grid-template-columns: 1fr 1fr;gap:24px;align-items:stretch}
.triple-col-item{display:flex;flex-direction:column}
.triple-col-item .section-head{margin-bottom:16px}
.triple-col-item .section-head .title h2{font-size:18px}
.triple-col-item .section-head .title .en{font-size:11px}
.triple-col-item .section-head .more{font-size:12px}
.triple-col-item .col-content{flex:1;display:flex;flex-direction:column}

/* Image Flow (in triple column) */
.img-flow{display:grid;grid-template-columns:1fr 1fr;gap:6px;flex:1;grid-template-rows:repeat(3,1fr);min-height:0}
.img-flow-item{overflow:hidden;border-radius:4px;position:relative;cursor:pointer;min-height:0}
.img-flow-item.tall{grid-row:span 2}
.img-flow-item img{width:100%;height:100%;min-height:80px;object-fit:cover;transition:transform .5s}
.img-flow-item:hover img{transform:scale(1.08)}
.img-flow-item .caption{position:absolute;bottom:0;left:0;right:0;background:linear-gradient(transparent,rgba(0,0,0,.7));color:#fff;padding:16px 8px 6px;font-size:14px;opacity:0;transition:opacity .3s}
.img-flow-item:hover .caption{opacity:1}

/* Lecture List */
.lecture-list{flex:1;display:flex;flex-direction:column;min-height:0}
.lecture-item{flex:1;padding:12px 0;border-bottom:1px dashed var(--border)}
.lecture-item:last-child{border-bottom:none}
.lecture-item .lecture-tag{display:inline-block;background:var(--primary);color:#fff;font-size:10px;padding:2px 8px;border-radius:3px;margin-bottom:6px;font-weight:600}
.lecture-item .lecture-tag.review{background:var(--text-light)}
.lecture-item h4{display: -webkit-box;-webkit-box-orient: vertical;-webkit-line-clamp: 2;overflow: hidden;text-overflow: ellipsis;font-size:16px;color:var(--text);font-weight:500;margin-bottom:4px;line-height:1.5}
.lecture-item h4:hover{color:var(--primary)}
.lecture-item .lecture-info{font-size:14px;color:var(--text-mid);margin-bottom:2px}
.lecture-item .lecture-date{font-size:14px;color:var(--text-light)}

/* Recruit List */
.recruit-list{flex:1;display:flex;flex-direction:column;min-height:0}
.recruit-item{flex:1;padding:12px 0;border-bottom:1px dashed var(--border)}
.recruit-item:last-child{border-bottom:none}
.recruit-item .recruit-tag{display:inline-block;background:var(--gold);color:#fff;font-size:10px;padding:2px 8px;border-radius:3px;margin-bottom:6px;font-weight:600}
.recruit-item .recruit-tag.faculty{background:var(--primary)}
.recruit-item .recruit-tag.postdoc{background:#1B6B42}
.recruit-item h4{display: -webkit-box;-webkit-box-orient: vertical;-webkit-line-clamp: 1;overflow: hidden;text-overflow: ellipsis;font-size:16px;color:var(--text);font-weight:500;margin-bottom:4px;line-height:1.5}
.recruit-item h4:hover{color:var(--primary)}
.recruit-item p{display: -webkit-box;-webkit-box-orient: vertical;-webkit-line-clamp: 1;overflow: hidden;text-overflow: ellipsis;font-size:14px;color:var(--text-light)}
.quick-channel{background:#fff;padding:36px 0}
.quick-channel-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.qc-card{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:28px 16px;border-radius:8px;background:linear-gradient(135deg,#F5F6FA,#EBEDF2);transition:all .3s;cursor:pointer;border:2px solid transparent}
.qc-card:hover{background:linear-gradient(135deg,#1B3F6B,#2A5A8E);transform:translateY(-4px);box-shadow:0 8px 25px rgba(27,63,107,.25);border-color:#C4982F}
.qc-card .qc-icon{width:64px;height:64px;border-radius:50%;background:#fff;display:flex;align-items:center;justify-content:center;margin-bottom:14px;box-shadow:0 2px 10px rgba(0,0,0,.08);overflow:hidden}
.qc-card .qc-icon img{width:40px;height:40px;object-fit:contain}
.qc-card:hover .qc-icon{background:rgba(255,255,255,.15)}
.qc-card h4{font-size:15px;color:#1B3F6B;font-weight:600;transition:color .3s}
.qc-card:hover h4{color:#fff}
.qc-card p{font-size:14px;color:#888;margin-top:4px;transition:color .3s}
.qc-card:hover p{color:rgba(255,255,255,.7)}

/* ========== Links Bar ========== */
.links-bar{background:var(--primary-dark);color:rgba(255,255,255,.7);padding:20px 0}
.links-bar .wrap{display:flex;flex-wrap:wrap;gap:8px 24px;align-items:center}
.links-bar .label{color:var(--gold-light);font-weight:600;flex-shrink:0}
.links-bar a{font-size:15px;color:rgba(255,255,255,.6)}
.links-bar a:hover{color:var(--gold-light)}

/* ========== Footer ========== */
.footer{background:#0A1E33;color:rgba(255,255,255,.6);/* padding:40px 0 0; */}
.footer .wrap{display: none;/* display:grid; */grid-template-columns:1fr 1fr 1fr;gap:30px;padding-bottom:30px}
.footer .col h4{color:#fff;font-size:15px;margin-bottom:14px;padding-bottom:8px;border-bottom:1px solid rgba(255,255,255,.1)}
.footer .col p{font-size:14px;line-height:2;margin-bottom:4px}
.footer .col p .lbl{color:rgba(255,255,255,.4);margin-right:6px}
.footer .col a{display:block;font-size:14px;color:rgba(255,255,255,.5);padding:3px 0}
.footer .col a:hover{color:var(--gold-light)}
.footer .qr{text-align:center}
.footer .qr img{width:100px;height:100px;margin:0 auto 8px;border-radius:4px;background:#fff;padding:4px}
.footer .qr p{font-size:14px;text-align:center}
.footer-bottom{padding: 20px 0;text-align:center;/* padding:14px 0; *//* border-top:1px solid rgba(255,255,255,.08); */font-size:14px;color:rgba(255,255,255,.4)}

/* ========== Back to Top ========== */
.back-top{position:fixed;bottom:40px;right:30px;width:44px;height:44px;background:var(--primary);color:#fff;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:20px;cursor:pointer;box-shadow:var(--shadow-hover);opacity:0;visibility:hidden;transition:all .3s;z-index:999}
.back-top.show{opacity:1;visibility:visible}
.back-top:hover{background:var(--gold)}

/* ========== Responsive ========== */
@media(max-width:1024px){
  .quick-nav .wrap,.platform-grid{grid-template-columns:repeat(2,1fr)}
  .quick-channel-grid{grid-template-columns:repeat(2,1fr)}
  .discipline-list{grid-template-columns:repeat(3,1fr)}
  .gallery{grid-template-columns:repeat(3,1fr)}
  .gallery-item:first-child{grid-column:span 2}
  .triple-col{grid-template-columns:1fr}
  .footer .wrap{grid-template-columns:repeat(2,1fr)}
  .news-section,.about-section,.edu-section{grid-template-columns:1fr}
  .party-grid{grid-template-columns:1fr}
.section-head .title h2 {font-size:18px;}
}

/* ≤992px：平板竖屏 / 手机 —— 顶部 Header 紧凑化 + 导航切换为汉堡菜单 */
@media(max-width:992px){
  /* Header */
  .header{padding:14px 0}
  .header .wrap{gap:10px}
  .header .logo-area{display:flex;gap:10px;align-items:center;min-width:0;flex:1 1 auto;overflow:hidden}
  .header .logo{flex:0 0 auto;max-width: 100%;display:flex;align-items:center}
  .header .logo img{height:40px;width:auto;max-width:100%;object-fit:contain}
  .header .title-area{min-width:0;flex:1 1 auto}
  .header .title-area h1{font-size:19px;letter-spacing:1px;line-height:1.35;overflow-wrap:break-word}
  .header .title-area .en{display:none}
  .header .badge{display:none}

  /* 汉堡按钮 */
  .nav{height:auto}
  .nav .wrap{display:block;padding:0}
  .nav-toggle{display:flex;align-items:center;justify-content:center;flex-direction:column;gap:5px;width:50px;height:50px;margin-left:20px;background:none;border:none;cursor:pointer}
  .nav-toggle span{width:22px;height:2px;background:#fff;border-radius:2px;transition:transform .3s,opacity .3s}
  .nav-toggle.active span:nth-child(1){transform:translateY(7px) rotate(45deg)}
  .nav-toggle.active span:nth-child(2){opacity:0}
  .nav-toggle.active span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

  /* 垂直菜单 */
  .nav ul.nav-list{display:none;flex-direction:column;width:100%;border-top:1px solid rgba(255,255,255,.12)}
  .nav.open ul.nav-list{display:flex}
  .nav ul.nav-list > li{flex:0 0 auto;width:100%;text-align:left;border-bottom:1px solid rgba(255,255,255,.08)}
  .nav ul.nav-list > li > a{line-height:44px;padding:0 20px;font-size:16px}
  .nav ul.nav-list > li.active > a{background:rgba(255,255,255,.08)}
  .nav ul.nav-list > li.active > a::after{display:none}
  .nav ul.nav-list > li.has-sub > a{display:flex;align-items:center;justify-content:space-between}
  .nav ul.nav-list > li.has-sub > a::after{content:'';width:8px;height:8px;border-right:2px solid rgba(255,255,255,.75);border-bottom:2px solid rgba(255,255,255,.75);transform:rotate(45deg);transition:transform .3s}
  .nav ul.nav-list > li.has-sub.open > a::after{transform:rotate(225deg)}

  /* 下拉：内联手风琴展开 */
  .nav ul.nav-list .dropdown{position:static;top:auto;min-width:0;width:100%;opacity:1;visibility:visible;transform:none;transition:none;box-shadow:none;border-radius:0;background:rgba(0,0,0,.18);display:none;padding:0}
  .nav ul.nav-list > li.open .dropdown{display:block}
  .nav ul.nav-list .dropdown li a{color:rgba(255,255,255,.85);border-bottom:1px solid rgba(255,255,255,.06);padding:10px 20px 10px 36px;font-size:14px}
  .nav ul.nav-list .dropdown li:last-child a{border-bottom:none}
  .nav ul.nav-list .dropdown li a:hover{background:rgba(255,255,255,.08);color:#fff;padding-left:40px}
}

/* ≤768px：手机 —— Header 进一步压缩、Topbar 精简 */
@media(max-width:768px){
  .header{padding:10px 0}
  .header .logo img{height:40px}
  .header .title-area h1{font-size:16px}
  .topbar{height:auto;line-height:normal;padding:7px 0}
  .topbar .wrap{justify-content:center}
  .topbar .welcome{display:none}
  .topbar .links{font-size:13px}
  .topbar .links span{margin:0 6px}
  .banner{height:280px}
  .banner .overlay h2{font-size:22px}
  .banner .overlay p{font-size:13px}
  .quick-nav .wrap,.platform-grid,.discipline-list,.gallery,.quick-channel-grid,.triple-col{grid-template-columns:1fr}
  .gallery-item:first-child{grid-column:span 1;grid-row:span 1}
  .footer .wrap{grid-template-columns:1fr}
.triple-col{flex-wrap: wrap;}   
.wd50{ max-width: 100%;}
}


@media(min-width:1028px){
.wd50{width:50%;}
.wd60{width:66.6%;}
}