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:root{
  --navy:#0B2E59;
  --navy-2:#133A7A;
  --blue:#1B4FA0;
  --blue-light:#E8F0FB;
  --red:#C8102E;
  --red-dark:#9E0C24;
  --gold:#E1A93B;
  --ink:#1A1F2B;
  --muted:#5B6472;
  --line:#E4E8EF;
  --bg:#FFFFFF;
  --bg-soft:#F6F8FC;
  --radius:14px;
  --radius-sm:10px;
  --shadow:0 10px 30px rgba(11,46,89,.08);
  --shadow-sm:0 4px 14px rgba(11,46,89,.06);
  --maxw:1200px;
  --header-h:88px;
  --font:"Microsoft YaHei","PingFang SC","Hiragino Sans GB","Source Han Sans SC","Noto Sans CJK SC",sans-serif;
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:var(--font);
  color:var(--ink);
  background:var(--bg);
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
ul{list-style:none}
.container{width:100%;max-width:var(--maxw);margin:0 auto;padding:0 24px}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;gap:8px;
  padding:12px 24px;border-radius:999px;font-size:15px;font-weight:700;
  cursor:pointer;border:1.5px solid transparent;transition:.2s ease;
}
.btn-primary{background:var(--red);color:#fff;box-shadow:0 8px 20px rgba(200,16,46,.25)}
.btn-primary:hover{background:var(--red-dark);transform:translateY(-2px)}
.btn-ghost{background:transparent;color:#fff;border-color:rgba(255,255,255,.6)}
.btn-ghost:hover{background:rgba(255,255,255,.12)}
.btn-outline{background:#fff;color:var(--navy);border-color:var(--line)}
.btn-outline:hover{border-color:var(--blue);color:var(--blue)}

/* ---------- 顶部导航 ---------- */
.header{
  position:sticky;top:0;z-index:50;
  background:rgba(255,255,255,.92);backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);
}
.header .container{display:flex;align-items:center;justify-content:space-between;height:var(--header-h)}
.brand{display:flex;align-items:center;gap:10px}
.brand img{height:70px;width:auto}
.nav{display:flex;align-items:center;gap:6px}
.nav a{
  padding:8px 14px;border-radius:8px;font-size:15px;color:var(--ink);font-weight:500;transition:.2s;
}
.nav a:hover{color:var(--blue);background:var(--bg-soft)}
.nav a.active{color:var(--red);background:var(--blue-light);font-weight:700}
.nav-toggle{display:none;background:none;border:none;cursor:pointer;padding:8px}
.nav-toggle span{display:block;width:24px;height:2px;background:var(--navy);margin:5px 0;border-radius:2px;transition:.2s}

/* ---------- Hero ---------- */
.hero{
  position:relative;overflow:hidden;
  background:linear-gradient(135deg,var(--navy) 0%,var(--navy-2) 55%,#1d4f9e 100%);
  color:#fff;padding:84px 0 96px;
}
.hero::after{
  content:"";position:absolute;right:-80px;top:-80px;width:420px;height:420px;border-radius:50%;
  background:radial-gradient(circle,rgba(225,169,59,.22),transparent 60%);
}
.hero-grid{
  position:relative;z-index:2;display:grid;grid-template-columns:1.15fr .85fr;gap:48px;align-items:center;
}
.hero .eyebrow{
  display:inline-block;font-size:13px;letter-spacing:2px;color:var(--gold);
  border:1px solid rgba(225,169,59,.5);padding:6px 14px;border-radius:999px;margin-bottom:20px;
}
.hero h1{font-size:46px;line-height:1.2;font-weight:800;margin-bottom:18px}
.hero h1 .accent{color:var(--gold)}
.hero p.lead{font-size:18px;color:rgba(255,255,255,.86);max-width:560px;margin-bottom:30px}
.hero-cta{display:flex;gap:14px;flex-wrap:wrap}
.hero-card{
  background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.18);
  border-radius:18px;padding:26px;backdrop-filter:blur(4px);
}
.hero-card h3{font-size:17px;margin-bottom:14px;color:var(--gold)}
.hero-card ul li{display:flex;gap:10px;padding:7px 0;font-size:14.5px;color:rgba(255,255,255,.9);border-bottom:1px dashed rgba(255,255,255,.12)}
.hero-card ul li:last-child{border-bottom:none}
.dot{width:8px;height:8px;border-radius:50%;background:var(--gold);flex:0 0 auto;margin-top:8px}

/* ---------- 通用区块 ---------- */
.section{padding:80px 0}
.section.soft{background:var(--bg-soft)}
.section-head{max-width:760px;margin:0 auto 48px;text-align:center}
.section-head .tag{color:var(--red);font-weight:700;letter-spacing:1px;font-size:14px}
.section-head h2{font-size:32px;font-weight:800;margin:10px 0 14px;color:var(--navy)}
.section-head p{color:var(--muted);font-size:16px}

/* ---------- 卡片网格 ---------- */
.grid{display:grid;gap:24px}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-4{grid-template-columns:repeat(4,1fr)}
.grid-2{grid-template-columns:repeat(2,1fr)}

.card{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:28px;box-shadow:var(--shadow-sm);transition:.25s;height:100%;
}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow);border-color:var(--blue-light)}
.card .ico{
  width:48px;height:48px;border-radius:12px;background:var(--blue-light);
  display:flex;align-items:center;justify-content:center;color:var(--blue);margin-bottom:16px;
}
.card h3{font-size:19px;color:var(--navy);margin-bottom:10px}
.card p{color:var(--muted);font-size:15px}
.card .more{display:inline-block;margin-top:14px;color:var(--blue);font-weight:700;font-size:14px}
.card .more:hover{color:var(--red)}

/* ---------- 数据条 ---------- */
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;text-align:center}
.stat{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:28px 18px}
.stat .num{font-size:42px;font-weight:800;color:var(--red);line-height:1}
.stat .num small{font-size:18px;color:var(--navy)}
.stat .label{margin-top:10px;color:var(--muted);font-size:14.5px}

/* ---------- 两栏图文 ---------- */
.split{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center}
.split .visual{
  background:linear-gradient(135deg,var(--navy),var(--blue));border-radius:20px;
  aspect-ratio:4/3;position:relative;overflow:hidden;display:flex;align-items:center;justify-content:center;
}
.prose p{color:var(--muted);font-size:16px;margin-bottom:16px}
.prose h3{color:var(--navy);font-size:22px;margin-bottom:14px}
.prose strong{color:var(--ink)}

/* ---------- 机构分布专属 ---------- */
.org-block{margin-bottom:36px}
.org-block h3{font-size:22px;color:var(--navy);margin-bottom:6px;display:flex;align-items:center;gap:10px}
.org-block h3::before{content:"";width:6px;height:22px;border-radius:3px;background:var(--red)}
.org-block .sub{color:var(--muted);margin-bottom:18px;font-size:15px}
.chips{display:flex;flex-wrap:wrap;gap:10px}
.chip{
  background:#fff;border:1px solid var(--line);border-radius:999px;padding:9px 16px;font-size:14.5px;color:var(--ink);
  display:inline-flex;align-items:center;gap:8px;
}
.chip .pin{width:9px;height:9px;border-radius:50%;background:var(--gold)}
.chip.observer .pin{background:#8A93A6}
.chip.partner .pin{background:var(--blue)}
.inst-list{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}
.inst{
  background:#fff;border:1px solid var(--line);border-left:4px solid var(--blue);
  border-radius:var(--radius-sm);padding:20px;
}
.inst h4{color:var(--navy);font-size:17px;margin-bottom:6px}
.inst .loc{color:var(--red);font-size:13.5px;font-weight:700;margin-bottom:8px}
.inst p{color:var(--muted);font-size:14.5px}

/* 城市机构分布分组 */
.city-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:22px}
.city-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:24px;box-shadow:var(--shadow-sm)}
.city-card .city-head{display:flex;align-items:center;gap:10px;margin-bottom:14px;padding-bottom:12px;border-bottom:2px solid var(--blue-light)}
.city-card .city-head h3{font-size:20px;color:var(--navy);margin:0}
.city-card .city-tag{font-size:12px;font-weight:700;color:#fff;background:var(--blue);padding:3px 10px;border-radius:6px}
.city-card .city-tag.summit{background:var(--red)}
.org-group{margin-top:14px}
.org-group h5{font-size:13.5px;color:var(--red);margin-bottom:6px;font-weight:700;letter-spacing:.5px}
.org-group ul li{padding:7px 0;border-bottom:1px dashed var(--line);font-size:14.5px;color:var(--ink);line-height:1.6}
.org-group ul li:last-child{border-bottom:none}
.org-group .bracket{color:var(--muted);font-size:13px}
.org-group .banned{color:var(--red);font-weight:700}
.city-chips{display:flex;flex-wrap:wrap;gap:10px;margin-top:8px}

/* ---------- 新闻列表 ---------- */
.news-item{
  display:grid;grid-template-columns:140px 1fr;gap:20px;padding:22px 0;border-bottom:1px solid var(--line);
}
.news-item:last-child{border-bottom:none}
.news-date{background:var(--bg-soft);border-radius:var(--radius-sm);padding:14px;text-align:center;height:fit-content}
.news-date .d{font-size:28px;font-weight:800;color:var(--navy);line-height:1}
.news-date .m{font-size:13px;color:var(--muted);margin-top:4px}
.news-item h3{font-size:18px;color:var(--navy);margin-bottom:8px}
.news-item h3 a:hover{color:var(--red)}
.news-item p{color:var(--muted);font-size:14.5px}
.news-tag{display:inline-block;background:var(--blue-light);color:var(--blue);font-size:12px;font-weight:700;padding:3px 10px;border-radius:6px;margin-bottom:8px}

/* ---------- 联系 ---------- */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:40px}
.form label{display:block;font-size:14px;color:var(--muted);margin:14px 0 6px;font-weight:600}
.form input,.form textarea{
  width:100%;padding:12px 14px;border:1px solid var(--line);border-radius:10px;font-family:var(--font);font-size:15px;
}
.form input:focus,.form textarea:focus{outline:none;border-color:var(--blue);box-shadow:0 0 0 3px var(--blue-light)}
.info-item{display:flex;gap:14px;padding:16px 0;border-bottom:1px solid var(--line)}
.info-item .ico{width:42px;height:42px;border-radius:10px;background:var(--blue-light);color:var(--blue);display:flex;align-items:center;justify-content:center;flex:0 0 auto}
.info-item h4{font-size:15px;color:var(--navy)}
.info-item p{color:var(--muted);font-size:14.5px}

/* ---------- 面包屑 / 页头 ---------- */
.page-hero{background:linear-gradient(135deg,var(--navy),var(--navy-2));color:#fff;padding:54px 0}
.page-hero h1{font-size:34px;font-weight:800;margin-bottom:8px}
.page-hero p{color:rgba(255,255,255,.82);font-size:16px}
.crumb{font-size:13.5px;color:var(--gold);margin-bottom:12px}

/* ---------- 页脚 ---------- */
.footer{background:var(--navy);color:rgba(255,255,255,.82);padding:56px 0 28px}
.footer .cols{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:36px}
.footer h4{color:#fff;font-size:16px;margin-bottom:16px}
.footer a{color:rgba(255,255,255,.72);font-size:14.5px;display:block;padding:5px 0}
.footer a:hover{color:var(--gold)}
.footer .brand img{height:62px;filter:brightness(0) invert(1);margin-bottom:14px}
.footer .about{font-size:14px;color:rgba(255,255,255,.65);max-width:320px}
.footer-bottom{border-top:1px solid rgba(255,255,255,.12);margin-top:36px;padding-top:20px;font-size:13px;color:rgba(255,255,255,.55);text-align:center}
.footer-bottom .fb-line{margin:5px 0}

/* ---------- 返回顶部 ---------- */
.totop{
  position:fixed;right:22px;bottom:22px;width:46px;height:46px;border-radius:50%;background:var(--red);color:#fff;
  display:flex;align-items:center;justify-content:center;cursor:pointer;box-shadow:var(--shadow);opacity:0;pointer-events:none;transition:.25s;z-index:60;
}
.totop.show{opacity:1;pointer-events:auto}

/* ---------- AI 视觉（首页 AI 生图） ---------- */
.ai-showcase{background:linear-gradient(180deg,#fff 0%, var(--bg-soft) 100%)}
.ai-hero-fig{position:relative;margin:0;border-radius:20px;overflow:hidden;box-shadow:0 24px 60px rgba(11,46,89,.18);background:#0b2e59}
.ai-hero-fig img{display:block;width:100%;height:auto}
.ai-hero-fig .cap{
  position:absolute;left:0;right:0;bottom:0;padding:28px 30px 22px;color:#fff;
  background:linear-gradient(0deg,rgba(6,26,52,.85),rgba(6,26,52,.35) 46%,rgba(6,26,52,0));
  font-size:14.5px;line-height:1.6;
}
.ai-hero-fig .cap strong{display:block;font-size:21px;margin-bottom:6px;letter-spacing:.5px}
.ai-badge{
  position:absolute;top:16px;right:16px;z-index:2;background:rgba(255,255,255,.95);color:#126A39;
  font-weight:800;font-size:12px;padding:5px 11px;border-radius:999px;letter-spacing:1px;
  box-shadow:0 2px 10px rgba(0,0,0,.15);
}
/* ---------- 响应式 ---------- */
@media(max-width:980px){
  .hero-grid{grid-template-columns:1fr;gap:32px}
  .hero h1{font-size:36px}
  .split{grid-template-columns:1fr;gap:28px}
  .grid-3,.grid-4{grid-template-columns:repeat(2,1fr)}
  .stats{grid-template-columns:repeat(2,1fr)}
  .inst-list{grid-template-columns:1fr}
  .contact-grid{grid-template-columns:1fr}
  .footer .cols{grid-template-columns:1fr 1fr}
}
@media(max-width:760px){
  .nav{
    position:absolute;top:var(--header-h);left:0;right:0;background:#fff;flex-direction:column;align-items:stretch;
    padding:14px 24px;gap:4px;border-bottom:1px solid var(--line);display:none;box-shadow:var(--shadow-sm);
  }
  .nav.open{display:flex}
  .nav a{padding:12px 14px}
  .nav-toggle{display:block}
  .section{padding:56px 0}
  .section-head h2{font-size:26px}
  .grid-2,.grid-3,.grid-4{grid-template-columns:1fr}
  .news-item{grid-template-columns:1fr}
  .news-date{display:flex;align-items:center;gap:10px;text-align:left}
  .footer .cols{grid-template-columns:1fr}
  .hero h1{font-size:30px}
}