:root{
    --blue:#005BBB;          /* UNESCO 机构蓝 */
    --blue-deep:#003A78;     /* 深蓝（页脚/导航底） */
    --blue-darker:#002B5C;
    --teal:#00A0DF;          /* 强调青 */
    --ink:#16202B;
    --muted:#5B6770;
    --line:#DCE3EA;
    --bg:#FFFFFF;
    --bg-alt:#F4F7FA;
    --maxw:1440px;
    --serif:"Noto Serif SC","Songti SC",Georgia,"Times New Roman",serif;
    --sans:"Noto Sans SC","PingFang SC","Microsoft YaHei",-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  }
  *{margin:0;padding:0;box-sizing:border-box;}
  html{scroll-behavior:smooth;}
  body{font-family:var(--sans);color:var(--ink);background:var(--bg);line-height:1.65;-webkit-font-smoothing:antialiased;}
  a{color:inherit;text-decoration:none;}
  img{display:block;max-width:100%;}
  .wrap{max-width:var(--maxw);margin:0 auto;padding:0 24px;}
  .eyebrow{display:inline-flex;align-items:center;gap:10px;font-size:12px;font-weight:700;letter-spacing:.18em;text-transform:uppercase;color:var(--teal);}
  .eyebrow::before{content:"";width:28px;height:2px;background:var(--teal);display:inline-block;}
  .sec-title{font-family:var(--serif);font-size:clamp(26px,3.4vw,40px);font-weight:800;line-height:1.2;margin:14px 0 16px;color:var(--blue-deep);}
  .sec-intro{max-width:760px;color:var(--muted);font-size:16px;}
  section{padding:84px 0;}

  /* ---------- 新版导航：庄重机构风 ---------- */
  .top-ribbon{height:4px;background:linear-gradient(90deg,var(--blue) 0%,var(--teal) 100%);}
  .util{background:var(--blue-darker);color:#C7D8EC;font-size:12.5px;}
  .util .wrap{display:flex;justify-content:space-between;align-items:center;height:40px;
    max-width:var(--maxw);margin:0 auto;padding:0 24px;}
  .util .left{display:flex;align-items:center;gap:9px;font-weight:500;letter-spacing:.02em;}
  .util .dot{width:6px;height:6px;border-radius:50%;background:var(--teal);display:inline-block;}
  .util .right{display:flex;gap:18px;align-items:center;}
  .util .right a{opacity:.85;transition:.2s;}
  .util .right a:hover{opacity:1;color:var(--teal);}

  header.site{position:sticky;top:0;z-index:50;
    background:linear-gradient(90deg,var(--blue-darker) 0%,var(--blue-deep) 52%,#004a96 100%);
    box-shadow:0 14px 34px rgba(0,43,92,.28);}
  header.site .wrap{display:flex;align-items:center;justify-content:space-between;
    max-width:var(--maxw);margin:0 auto;padding:0 24px;height:96px;}

  .brand{display:flex;align-items:center;gap:16px;}
  .brand .emblem{width:56px;height:56px;border-radius:50%;background:#fff;display:grid;place-items:center;
    box-shadow:0 5px 16px rgba(0,0,0,.28);}
  .brand .emblem img{width:42px;height:42px;object-fit:contain;}
  .brand .txt{display:flex;flex-direction:column;line-height:1.05;}
  .brand .name{font-family:var(--serif);font-weight:800;font-size:25px;color:#fff;letter-spacing:.05em;}
  .brand .sub{font-size:11px;letter-spacing:.30em;color:rgba(255,255,255,.72);font-weight:600;margin-top:3px;}

  nav.main{display:flex;align-items:stretch;height:96px;}
  nav.main .nav-item{position:relative;display:flex;align-items:center;}
  nav.main .nav-item > a{display:flex;align-items:center;gap:6px;font-size:16px;font-weight:500;
    color:rgba(255,255,255,.92);padding:0 17px;height:96px;transition:.2s;}
  nav.main .nav-item:hover > a{color:#fff;background:rgba(255,255,255,.07);}
  nav.main .caret{width:9px;height:9px;border-right:1.6px solid currentColor;border-bottom:1.6px solid currentColor;
    transform:rotate(45deg) translateY(-2px);opacity:.7;}

  .drop{position:absolute;top:100%;left:0;min-width:216px;background:#fff;border-radius:0 0 8px 8px;
    box-shadow:0 22px 48px rgba(0,43,92,.28);padding:10px 0;opacity:0;visibility:hidden;
    transform:translateY(10px);transition:.22s;}
  .nav-item:hover .drop{opacity:1;visibility:visible;transform:none;}
  .drop .dh{font-size:11px;letter-spacing:.18em;color:var(--teal);font-weight:700;padding:8px 22px 6px;}
  .drop a{display:block;padding:11px 22px;font-size:14.5px;color:var(--ink);transition:.18s;}
  .drop a:hover{background:var(--bg-alt);color:var(--blue);padding-left:28px;}

  .nav-actions{display:flex;align-items:center;gap:16px;margin-left:8px;}
  .lang{display:flex;align-items:center;gap:7px;font-size:13px;color:rgba(255,255,255,.82);}
  .lang a{color:rgba(255,255,255,.82);}
  .lang a.on{color:#fff;font-weight:700;}
  .lang .sep{opacity:.4;}
  .nav-search{width:42px;height:42px;border:1px solid rgba(255,255,255,.35);border-radius:50%;
    display:grid;place-items:center;color:#fff;cursor:pointer;transition:.2s;}
  .nav-search:hover{background:rgba(255,255,255,.12);border-color:var(--teal);}
  .menu-btn{display:none;background:none;border:1px solid rgba(255,255,255,.4);border-radius:6px;
    width:46px;height:40px;cursor:pointer;color:#fff;}
  .menu-btn span{display:block;width:18px;height:2px;background:#fff;margin:3px auto;}

  /* ---------- Hero ---------- */
  .hero{position:relative;min-height:620px;display:flex;align-items:center;color:#fff;overflow:hidden;}
  .hero .bg{position:absolute;inset:0;background:url('assets/images/hero-mountain.png') center/cover no-repeat;}
  .hero .bg::after{content:"";position:absolute;inset:0;background:linear-gradient(105deg,rgba(0,43,92,.92) 0%,rgba(0,91,187,.72) 46%,rgba(0,91,187,.30) 100%);}
  .hero .wrap{position:relative;z-index:2;padding:90px 24px;}
  .hero .eyebrow{color:#fff;}
  .hero .eyebrow::before{background:#fff;}
  .hero h1{font-family:var(--serif);font-size:clamp(40px,6vw,72px);font-weight:800;line-height:1.05;margin:18px 0 8px;letter-spacing:.02em;}
  .hero .lede{font-size:clamp(18px,2.4vw,24px);font-weight:600;letter-spacing:.06em;color:#E8F1FB;margin-bottom:18px;}
  .hero p.desc{max-width:620px;color:#D6E4F2;font-size:16.5px;margin-bottom:30px;}
  .btn-row{display:flex;gap:16px;flex-wrap:wrap;}
  .btn{display:inline-flex;align-items:center;gap:9px;padding:13px 26px;font-size:15px;font-weight:600;border-radius:3px;transition:.2s;cursor:pointer;}
  .btn-primary{background:#fff;color:var(--blue-deep);}
  .btn-primary:hover{background:var(--teal);color:#fff;}
  .btn-ghost{border:1.5px solid rgba(255,255,255,.7);color:#fff;}
  .btn-ghost:hover{background:#fff;color:var(--blue-deep);border-color:#fff;}
  .scroll-cue{position:absolute;bottom:26px;left:50%;transform:translateX(-50%);z-index:2;color:#fff;font-size:12px;letter-spacing:.2em;opacity:.8;}

  /* ---------- Stats band ---------- */
  .stats{background:var(--blue);color:#fff;padding:46px 0;}
  .stats .grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;}
  .stat{text-align:center;position:relative;}
  .stat:not(:last-child)::after{content:"";position:absolute;right:-12px;top:18%;height:64%;width:1px;background:rgba(255,255,255,.25);}
  .stat .num{font-family:var(--serif);font-size:clamp(34px,4.4vw,52px);font-weight:800;line-height:1;}
  .stat .num .suffix{font-size:.55em;color:#BFE0F5;margin-left:2px;}
  .stat .lbl{margin-top:10px;font-size:14px;letter-spacing:.04em;color:#DCEAF8;}

  /* ---------- Generic section ---------- */
  .section-head{margin-bottom:46px;}
  .section-head .sec-intro{margin-top:4px;}
  .section-head.row{display:flex;justify-content:space-between;align-items:flex-end;gap:24px;flex-wrap:wrap;}
  .section-head .sh-left{flex:1;min-width:0;}
  .head-more{display:inline-flex;align-items:center;gap:8px;color:var(--blue);font-weight:600;font-size:15px;white-space:nowrap;border:1px solid var(--blue);padding:10px 20px;border-radius:30px;transition:.2s;}
  .head-more:hover{background:var(--blue);color:#fff;}
  .head-more .arr{transition:.2s;}
  .head-more:hover .arr{transform:translateX(4px);}
  .alt{background:var(--bg-alt);}

  /* Philosophy */
  .philo-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:54px;align-items:center;}
  .pillars{display:grid;grid-template-columns:1fr 1fr;gap:22px;margin-top:30px;}
  .pillar{border:1px solid var(--line);background:#fff;padding:26px 24px;border-radius:4px;transition:.2s;}
  .pillar:hover{border-color:var(--blue);box-shadow:0 8px 24px rgba(0,59,120,.08);transform:translateY(-3px);}
  .pillar .tag{font-size:12px;font-weight:700;letter-spacing:.16em;color:var(--teal);}
  .pillar h3{font-family:var(--serif);font-size:23px;font-weight:800;color:var(--blue-deep);margin:8px 0 10px;}
  .pillar p{font-size:14.5px;color:var(--muted);}
  .philo-img{border:1px solid var(--line);border-radius:4px;overflow:hidden;box-shadow:0 14px 40px rgba(0,59,120,.12);}
  .philo-img img{width:100%;height:100%;object-fit:cover;}

  /* Global */
  .global-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:48px;align-items:start;}
  .map-frame{border:1px solid var(--line);background:#fff;border-radius:4px;padding:14px;}
  .map-frame img{width:100%;border-radius:2px;}
  .map-frame .cap{font-size:12.5px;color:var(--muted);padding:10px 4px 2px;border-top:1px solid var(--line);margin-top:10px;}
  .regions{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-top:8px;}
  .region{border:1px solid var(--line);background:#fff;border-radius:4px;padding:16px 18px;display:flex;justify-content:space-between;align-items:center;}
  .region .r-name{font-weight:600;font-size:15px;}
  .region .r-num{font-family:var(--serif);font-weight:800;color:var(--blue);font-size:22px;}
  .tags{margin-top:22px;display:flex;flex-wrap:wrap;gap:9px;}
  .tag-chip{font-size:13px;border:1px solid var(--blue);color:var(--blue);padding:5px 13px;border-radius:30px;background:rgba(0,91,187,.04);}

  /* Colleges */
  .cards{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;}
  .college{border:1px solid var(--line);background:#fff;border-radius:4px;padding:24px 22px;transition:.2s;position:relative;overflow:hidden;}
  .college::before{content:"";position:absolute;left:0;top:0;width:4px;height:0;background:var(--blue);transition:.25s;}
  .college:hover{box-shadow:0 10px 28px rgba(0,59,120,.10);transform:translateY(-4px);}
  .college:hover::before{height:100%;}
  .college .badge{width:48px;height:48px;border-radius:50%;background:var(--blue);color:#fff;display:grid;place-items:center;font-family:var(--serif);font-weight:800;font-size:18px;margin-bottom:16px;}
  .college h3{font-size:17px;font-weight:700;color:var(--blue-deep);line-height:1.3;min-height:44px;}
  .college .focus{font-size:13px;color:var(--muted);margin-top:10px;}

  /* Achievements */
  .ach-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;}
  .ach{border:1px solid var(--line);background:#fff;border-radius:4px;padding:28px 26px;transition:.2s;}
  .ach:hover{border-color:var(--teal);box-shadow:0 10px 28px rgba(0,160,223,.10);transform:translateY(-3px);}
  .ach .ico{width:44px;height:44px;border-radius:8px;background:rgba(0,91,187,.08);color:var(--blue);display:grid;place-items:center;font-size:22px;margin-bottom:16px;}
  .ach h3{font-size:18px;font-weight:700;color:var(--blue-deep);margin-bottom:9px;}
  .ach p{font-size:14px;color:var(--muted);}

  /* Featured story */
  .featured{display:grid;grid-template-columns:1fr 1fr;gap:0;border:1px solid var(--line);border-radius:4px;overflow:hidden;background:#fff;}
  .featured .pic{position:relative;min-height:380px;background:url('assets/images/campus.png') center/cover no-repeat;}
  .featured .pic::after{content:"";position:absolute;inset:0;background:linear-gradient(120deg,rgba(0,43,92,.25),rgba(0,91,187,.05));}
  .featured .body{padding:52px 48px;display:flex;flex-direction:column;justify-content:center;}
  .featured .kicker{font-size:12px;font-weight:700;letter-spacing:.16em;color:var(--teal);text-transform:uppercase;}
  .featured h2{font-family:var(--serif);font-size:30px;font-weight:800;color:var(--blue-deep);margin:12px 0 16px;line-height:1.25;}
  .featured p{color:var(--muted);font-size:15.5px;margin-bottom:24px;}
  .link-more{display:inline-flex;align-items:center;gap:8px;color:var(--blue);font-weight:600;font-size:15px;}
  .link-more .arr{transition:.2s;}
  .link-more:hover .arr{transform:translateX(5px);}
  .story-extra{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:22px;}
  .scard{border:1px solid var(--line);border-radius:5px;padding:18px 20px;background:#fff;transition:.2s;}
  .scard:hover{border-color:var(--blue);transform:translateY(-3px);}
  .scard h4{font-size:15.5px;font-weight:700;color:var(--blue-deep);margin-bottom:8px;line-height:1.35;}
  .scard p{font-size:13.5px;color:var(--muted);}

  /* News */
  .news-list{border-top:1px solid var(--line);}
  .news-item{display:grid;grid-template-columns:130px 130px 1fr 40px;gap:20px;align-items:center;padding:22px 8px;border-bottom:1px solid var(--line);transition:.2s;}
  .news-item:hover{background:var(--bg-alt);}
  .news-item .date{font-family:var(--serif);font-weight:700;color:var(--blue);font-size:15px;}
  .news-item .cat{font-size:12px;font-weight:600;letter-spacing:.05em;color:var(--teal);border:1px solid var(--teal);border-radius:30px;padding:4px 12px;text-align:center;}
  .news-item .ttl{font-size:16.5px;font-weight:600;color:var(--ink);}
  .news-item .go{color:var(--muted);justify-self:end;transition:.2s;}
  .news-item:hover .go{color:var(--blue);transform:translateX(4px);}

  /* Video Zone */
  .video-hero{position:relative;width:100%;aspect-ratio:16/9;border-radius:6px;overflow:hidden;border:1px solid var(--line);cursor:pointer;background:#06223f;}
  .video-hero img{width:100%;height:100%;object-fit:cover;transition:.4s;}
  .video-hero:hover img{transform:scale(1.04);}
  .video-hero .v-overlay{position:absolute;inset:0;background:linear-gradient(180deg,rgba(0,43,92,.10),rgba(0,43,92,.62));display:flex;flex-direction:column;justify-content:flex-end;padding:26px 30px;}
  .video-hero .play{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);width:76px;height:76px;border-radius:50%;background:rgba(255,255,255,.92);display:grid;place-items:center;transition:.25s;}
  .video-hero:hover .play{background:#fff;transform:translate(-50%,-50%) scale(1.08);}
  .video-hero .vtitle{color:#fff;font-family:var(--serif);font-size:clamp(18px,2.4vw,26px);font-weight:800;margin-bottom:6px;}
  .video-hero .vdesc{color:#DCEAF8;font-size:14px;max-width:660px;}
  .vgrid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:20px;}
  .vgrid .vsrc{display:inline-block;margin:4px 0 8px;font-size:12.5px;font-weight:600;color:var(--teal);background:rgba(0,160,223,.1);padding:3px 11px;border-radius:20px;}
  .ext-copy{display:inline-flex;align-items:center;gap:8px;background:transparent;color:#C7D8EC;border:1px solid rgba(199,216,236,.45);font-weight:600;font-size:14px;padding:10px 20px;border-radius:30px;cursor:pointer;transition:.2s;margin-left:10px;}
  .ext-copy:hover{background:rgba(255,255,255,.1);border-color:#C7D8EC;}
  .vthumb{position:relative;border:1px solid var(--line);border-radius:5px;overflow:hidden;cursor:pointer;background:#fff;transition:.2s;}
  .vthumb:hover{box-shadow:0 10px 26px rgba(0,59,120,.12);transform:translateY(-3px);}
  .vthumb img{width:100%;aspect-ratio:16/9;object-fit:cover;}
  .vthumb .vt{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);width:46px;height:46px;border-radius:50%;background:rgba(255,255,255,.9);display:grid;place-items:center;}
  .vthumb .dur{position:absolute;right:8px;bottom:64px;background:rgba(0,0,0,.72);color:#fff;font-size:12px;padding:2px 7px;border-radius:3px;}
  .vthumb .cap{padding:13px 15px;}
  .vthumb .cap h4{font-size:15px;font-weight:700;color:var(--blue-deep);line-height:1.35;margin-bottom:5px;}
  .vthumb .cap p{font-size:13px;color:var(--muted);}

  /* Lightbox */
  .lightbox{position:fixed;inset:0;background:rgba(4,18,38,.88);display:none;place-items:center;z-index:100;padding:24px;}
  .lightbox.open{display:grid;}
  .lightbox .lb-inner{width:min(960px,94vw);background:#000;border-radius:8px;overflow:hidden;position:relative;}
  .lightbox video,.lightbox img.lb-poster{width:100%;display:block;max-height:80vh;object-fit:contain;background:#000;}
  .lightbox .lb-note{padding:18px 22px;color:#C7D8EC;font-size:14px;background:#06223f;line-height:1.7;}
  .lightbox .lb-close{position:absolute;top:12px;right:14px;width:38px;height:38px;border-radius:50%;background:rgba(255,255,255,.92);color:#06223f;display:grid;place-items:center;cursor:pointer;font-size:20px;font-weight:700;border:0;z-index:2;}
  .lightbox .lb-close:hover{background:#fff;}

  /* CTA */
  .cta{background:var(--blue-deep);color:#fff;text-align:center;}
  .cta h2{font-family:var(--serif);font-size:clamp(28px,3.6vw,42px);font-weight:800;margin-bottom:14px;}
  .cta p{max-width:640px;margin:0 auto 28px;color:#C7D8EC;font-size:16px;}

  /* Footer */
  footer{background:var(--blue-darker);color:#C7D8EC;padding:60px 0 26px;}
  .foot-top{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:40px;padding-bottom:40px;border-bottom:1px solid rgba(255,255,255,.12);}
  .foot-brand{display:flex;gap:13px;align-items:center;margin-bottom:16px;}
  .foot-brand img{width:44px;height:44px;background:#fff;border-radius:50%;padding:5px;}
  .foot-brand .nm{font-family:var(--serif);font-weight:800;font-size:19px;color:#fff;}
  .foot-brand .sb{font-size:11px;letter-spacing:.2em;color:#9FBADD;}
  footer p.fl{font-size:13.5px;line-height:1.7;color:#9FBADD;max-width:320px;}
  .foot-col h4{font-size:13px;letter-spacing:.12em;text-transform:uppercase;color:#fff;margin-bottom:16px;font-weight:700;}
  .foot-col a{display:block;font-size:14px;color:#C7D8EC;padding:6px 0;transition:.2s;}
  .foot-col a:hover{color:var(--teal);padding-left:5px;}
  .foot-bottom{display:flex;justify-content:space-between;flex-wrap:wrap;gap:12px;padding-top:22px;font-size:12.5px;color:#8FA6C2;}
  .foot-bottom a{color:#8FA6C2;}
  .foot-bottom a:hover{color:#fff;}

  /* reveal */
  .reveal{opacity:0;transform:translateY(24px);transition:opacity .7s ease,transform .7s ease;}
  .reveal.in{opacity:1;transform:none;}

  /* responsive */
  @media(max-width:980px){
    nav.main{display:none;}
    .menu-btn{display:block;}
    .philo-grid,.global-grid,.featured{grid-template-columns:1fr;}
    .featured .pic{min-height:260px;}
    .cards{grid-template-columns:repeat(2,1fr);}
    .ach-grid,.vgrid,.story-extra{grid-template-columns:1fr 1fr;}
    .stats .grid{grid-template-columns:repeat(2,1fr);gap:30px 18px;}
    .stat:not(:last-child)::after{display:none;}
    .foot-top{grid-template-columns:1fr 1fr;}
  }
  @media(max-width:560px){
    .cards,.ach-grid,.vgrid,.regions,.story-extra{grid-template-columns:1fr;}
    .pillars{grid-template-columns:1fr;}
    .news-item{grid-template-columns:90px 1fr;grid-template-areas:"date ttl" "cat ttl" "go ttl";}
    .news-item .go{display:none;}
    .util .right{gap:12px;}
  }

/* ===== 新增：全球布局 / 关于页 组件 ===== */
.country-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;}
.country-card{border:1px solid var(--line);background:#fff;border-radius:5px;padding:22px 22px;transition:.2s;position:relative;overflow:hidden;}
.country-card::before{content:"";position:absolute;left:0;top:0;width:4px;height:0;background:var(--blue);transition:.25s;}
.country-card:hover{box-shadow:0 10px 26px rgba(0,59,120,.10);transform:translateY(-4px);}
.country-card:hover::before{height:100%;}
.country-card .c-name{font-family:var(--serif);font-size:21px;font-weight:800;color:var(--blue-deep);}
.country-card .c-en{font-size:11.5px;letter-spacing:.10em;color:var(--muted);text-transform:uppercase;margin-top:3px;}
.country-card .c-desc{font-size:13.5px;color:var(--muted);margin-top:12px;line-height:1.75;}
.country-card .c-tag{display:inline-block;margin-top:14px;font-size:12px;font-weight:600;color:var(--teal);border:1px solid var(--teal);border-radius:30px;padding:3px 12px;}
.region-block{margin-bottom:46px;}
.region-block h3{font-family:var(--serif);font-size:23px;font-weight:800;color:var(--blue-deep);margin-bottom:20px;padding-left:14px;border-left:4px solid var(--blue);}
.page-hero{padding:66px 0 30px;}
.page-hero .sec-intro{margin-top:14px;}
.about-mission{display:grid;grid-template-columns:repeat(2,1fr);gap:18px;}
.media-list{border-top:1px solid var(--line);}
.media-item{display:grid;grid-template-columns:130px 1fr 40px;gap:20px;align-items:center;padding:20px 8px;border-bottom:1px solid var(--line);transition:.2s;}
.media-item:hover{background:var(--bg-alt);}
.media-item .date{font-family:var(--serif);font-weight:700;color:var(--blue);font-size:15px;}
.media-item .ttl{font-size:16.5px;font-weight:600;color:var(--ink);}
.media-item .go{color:var(--muted);justify-self:end;transition:.2s;}
.media-item:hover .go{color:var(--blue);transform:translateX(4px);}
@media(max-width:980px){.country-grid{grid-template-columns:repeat(2,1fr);}.about-mission{grid-template-columns:1fr;}}
@media(max-width:560px){.country-grid{grid-template-columns:1fr;}.media-item{grid-template-columns:90px 1fr;grid-template-areas:"date ttl" "go ttl";}.media-item .go{display:none;}}