:root{
  /* 基础色 */
  --bg:#0f172a;          /* 深蓝灰：顶部 / 页脚 */
  --text:#0f172a;        /* 主体文字 */
  --muted:#64748b;       /* 次级文字 */
  --line:#e5e7eb;
  --card:#ffffff;
  --alt:#f6f8fb;

  /* 品牌蓝（核心） */
  --brand:#1e40af;       /* 主品牌蓝（按钮 / 高亮） */
  --brand2:#1e3a8a;      /* 深蓝（hover / 强调） */

  /* 其他 */
  --shadow: 0 18px 45px rgba(15,23,42,.08);
  --radius: 18px;
  --radius2: 24px;
}

*{box-sizing:border-box;margin:0;padding:0}
body{
  font-family: -apple-system,BlinkMacSystemFont,"Segoe UI",system-ui,Arial,sans-serif;
  color: var(--text);
  background:#fff;
  line-height:1.65;
}
a{color:inherit;text-decoration:none}
.container{max-width:1160px;margin:0 auto;padding:0 16px}
.sep{opacity:.6;margin:0 10px}

/* topbar */
.topbar{
  background:#0b1220;
  color:#e5e7eb;
  font-size:12px;
}
.topbar-inner{
  display:flex;justify-content:space-between;align-items:center;
  padding:8px 0;
}
.topbar a{color:#e5e7eb;opacity:.95}
.topbar a:hover{opacity:1;text-decoration:underline}
.lang{padding:2px 6px;border-radius:999px}
.lang.active{background:rgba(255,255,255,.12)}

/* header */
.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-inner{
  display:flex;align-items:center;justify-content:space-between;
  gap:16px;padding:12px 0;
}
.brand{display:flex;align-items:center;gap:10px;min-width:260px}
.brand-mark{
  width:34px;height:34px;border-radius:999px;
  background: linear-gradient(135deg, var(--brand), var(--brand2));
  box-shadow:0 10px 25px rgba(14,165,233,.18);
}
.brand{
  display:flex;
  align-items:center;
  gap:12px;
}

.brand-logo{
  height:42px;   /* 想更大：48/52 */
  width:auto;
  display:block;
}
.brand-text .brand-name{
  font-size: 18px;
  font-weight: 600;
  line-height: 1.2;
}

.brand-text .brand-sub{
  font-size: 12px;
  color: #6b7280;
}
.brand-name{font-weight:800;font-size:18px}
.brand-sub{font-size:11px;color:var(--muted);margin-top:2px}

.nav{display:flex;align-items:center;gap:18px}
.nav-link{
  font-size:14px;color:#334155;padding:10px 8px;border-radius:10px;
}
.nav-link:hover{background:#f1f5f9}
.nav-link.active{color:var(--brand);font-weight:700}

.nav-dd{
  position: relative;
  padding-bottom: 0;   /* ✅ 关键：给鼠标下移留“缓冲区”，hover 不会断 */
}
.nav-dd::after{
  content:"";
  position:absolute;
  left:0;
  top:100%;
  width:100%;
  height:14px;     /* ✅ 这段就是鼠标下移缓冲区 */
}
.dd-panel{
  position:absolute;
  left:0;
  top:100%;        /* ✅ 紧贴导航底部 */
  margin-top:-6px; /* 可选：往上贴一点，让缝更小 */
  z-index: 1000;          /* ✅ 防止被其它元素遮挡 */
  min-width: 220px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 14px;
  box-shadow: var(--shadow);
  padding: 8px;
  display: none;
}

.dd-panel.dd-grid{min-width:520px;display:none;grid-template-columns:repeat(2,minmax(0,1fr));gap:6px}
.dd-item{
  display:block;padding:10px 10px;border-radius:10px;
  font-size:13px;color:#0f172a;
}
.dd-item:hover{background:#f1f5f9}
.nav-dd:hover .dd-panel{display:block}
.nav-dd:hover .dd-panel.dd-grid{display:grid}

.nav-toggle{
  display:none;
  border:1px solid var(--line);
  background:#fff;border-radius:12px;
  padding:8px 10px;cursor:pointer;font-size:16px;
}

/* mobile nav */
.mnav{
  display:none;
  border-top:1px solid var(--line);
  background:#fff;
  padding:10px 16px 14px;
}
.mnav-link{
  display:block;padding:10px 10px;border-radius:12px;
  color:#334155;font-size:14px;
}
.mnav-link:hover{background:#f1f5f9}
.mnav-link.active{color:var(--brand);font-weight:700}
.mnav-lang{display:flex;gap:10px;padding:10px}

/* hero slider */
.hero{position:relative}
.hero-slider{position:relative;overflow:hidden}
.slide{
  position:relative;min-height:520px;
  display:none;
}
.slide.is-active{display:block}
.slide-bg{
  position:absolute;inset:0;
  background-size:cover;background-position:center;
  filter:saturate(1.05);
}
.slide-bg::after{
  content:"";
  position:absolute;inset:0;
  background: linear-gradient(90deg, rgba(3,7,18,.70) 0%, rgba(3,7,18,.40) 55%, rgba(3,7,18,.30) 100%);
}
.slide-content{
  position:relative;
  padding:86px 0 76px;
  color:#f8fafc;
  max-width:920px;
}
.kicker{
  display:inline-flex;
  font-size:12px;letter-spacing:.6px;
  padding:6px 10px;border-radius:999px;
  background: rgba(15,118,110,.22);
  border:1px solid rgba(94,234,212,.20);
  margin-bottom:14px;
}
.title{font-size:38px;line-height:1.15;font-weight:900;margin-bottom:14px}
.desc{font-size:14px;color:rgba(248,250,252,.88);max-width:780px;margin-bottom:22px}
.actions{display:flex;flex-wrap:wrap;gap:12px}

.btn{
  display:inline-flex;align-items:center;justify-content:center;
  padding:11px 18px;border-radius:999px;
  font-size:14px;font-weight:700;cursor:pointer;
  border:1px solid transparent;
}
.btn.primary{background:var(--brand);color:#ecfeff}
.btn.primary:hover{background:var(--brand2)}
.btn.ghost{
  background: rgba(255,255,255,.10);
  border-color: rgba(255,255,255,.25);
  color:#fff;
}
.btn.ghost:hover{background: rgba(255,255,255,.16)}

.slider-btn{
  position:absolute;top:50%;transform:translateY(-50%);
  width:42px;height:42px;border-radius:999px;
  border:1px solid rgba(255,255,255,.22);
  background: rgba(0,0,0,.18);
  color:#fff;font-size:28px;line-height:0;
  cursor:pointer;
}
.slider-btn:hover{background: rgba(0,0,0,.28)}
.slider-btn.prev{left:18px}
.slider-btn.next{right:18px}

.dots{
  position:absolute;left:50%;bottom:16px;transform:translateX(-50%);
  display:flex;gap:8px;align-items:center;
}
.dot{
  width:9px;height:9px;border-radius:999px;
  background: rgba(255,255,255,.35);
  border:1px solid rgba(255,255,255,.25);
  cursor:pointer;
}
.dot.active{background:#fff}

/* sections */
.section{padding:64px 0}
.section-alt{background:var(--alt)}
.section-head{max-width:860px;margin:0 auto 26px;text-align:center}
.section-head.row{display:flex;justify-content:space-between;align-items:flex-end;gap:12px;text-align:left;margin:0 0 18px}
.h2{font-size:24px;font-weight:900;color:#0f172a}
.p{font-size:14px;color:var(--muted);margin-top:6px}

.stats{
  display:grid;
  grid-template-columns: repeat(4,minmax(0,1fr));
  gap:14px;
  margin-top:18px;
}
.stat{
  border:1px solid var(--line);
  border-radius: var(--radius);
  padding:16px;
  background:#fff;
  box-shadow: 0 10px 26px rgba(15,23,42,.04);
}
.stat-num{font-size:26px;font-weight:900;color:var(--brand)}
.stat-label{font-size:12px;color:#475569;margin-top:4px}

/* cards */
.grid{display:grid;gap:14px}
.cards-3{grid-template-columns: repeat(3,minmax(0,1fr))}
.card{
  background:#fff;border:1px solid var(--line);
  border-radius: var(--radius);
  overflow:hidden;
  box-shadow: 0 10px 28px rgba(15,23,42,.05);
  transition: transform .15s ease, box-shadow .15s ease;
}
.card:hover{transform: translateY(-2px);box-shadow: var(--shadow)}
.card-img{
  height:156px;background:#d1d5db;background-size:cover;background-position:center;
}
.card-body{padding:14px}
.tag{
  display:inline-flex;
  font-size:11px;font-weight:800;
  padding:3px 8px;border-radius:999px;
  background:#ecfeff;color:#155e75;
  border:1px solid #cffafe;
}
.card-title{font-weight:900;margin-top:8px}
.card-desc{font-size:12px;color:var(--muted);margin-top:6px}

.center{display:flex;justify-content:center;margin-top:18px}

/* split */
.split{
  display:grid;
  grid-template-columns: minmax(0,3fr) minmax(0,2fr);
  gap:22px;
  align-items:start;
}
.list{margin-top:10px;color:#334155;font-size:13px;padding-left:18px}
.list li{margin:8px 0}
.split-media .note{font-size:12px;color:var(--muted);margin-top:10px}
.media-grid{
  display:grid;
  grid-template-columns:1fr;
  gap:12px;
}
.media{
  height:220px;border-radius: var(--radius2);
  border:1px solid var(--line);
  background:#d1d5db;background-size:cover;background-position:center;
  position:relative;overflow:hidden;
}
.media-cap{
  position:absolute;left:12px;bottom:12px;
  font-size:12px;font-weight:900;
  background: rgba(255,255,255,.86);
  border:1px solid rgba(229,231,235,.9);
  padding:6px 10px;border-radius:999px;
}

/* news */
.news.card{padding:14px}
.news-date{font-size:12px;color:var(--muted)}
.news.card .card-title{margin-top:8px}
.news.card .card-desc{margin-top:6px}

/* cta */
.cta{
  padding:34px 0;
  background: linear-gradient(90deg, #0b1220 0%, #0f172a 60%, #0b1220 100%);
  color:#f8fafc;
}
.cta-inner{
  display:flex;justify-content:space-between;align-items:center;
  gap:14px;flex-wrap:wrap;
}
.cta-title{font-size:20px;font-weight:900}
.cta-desc{font-size:13px;color:rgba(248,250,252,.80);margin-top:6px}
.cta-actions{display:flex;gap:10px;flex-wrap:wrap}

/* footer */
.footer{
  background:#0b1220;color:#e5e7eb;
  padding:34px 0 16px;
}
.footer-inner{
  display:grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  gap:16px;
}
.footer-brand{font-weight:900;font-size:16px}
.footer-sub{font-size:12px;color:rgba(229,231,235,.78);margin-top:6px}
.footer-title{font-weight:900;margin-bottom:10px}
.footer-link{
  display:block;font-size:12px;color:rgba(229,231,235,.82);
  margin:8px 0;
}
.footer-link:hover{color:#fff;text-decoration:underline}
.footer-text{font-size:12px;color:rgba(229,231,235,.82);margin:8px 0}
.footer-bottom{
  border-top:1px solid rgba(255,255,255,.12);
  margin-top:18px;padding-top:12px;
  display:flex;justify-content:space-between;gap:10px;flex-wrap:wrap;
  font-size:12px;color:rgba(229,231,235,.72);
}

/* placeholder helper */
.ph{
  background-color:#d1d5db;
  background-image: linear-gradient(90deg, rgba(255,255,255,.12) 0, rgba(255,255,255,.0) 35%, rgba(255,255,255,.12) 70%);
}

/* responsive */
@media (max-width: 980px){
  .nav{display:none}
  .nav-toggle{display:inline-flex}
  .mnav{display:none}
  .title{font-size:30px}
  .stats{grid-template-columns:repeat(2,minmax(0,1fr))}
  .cards-3{grid-template-columns:repeat(2,minmax(0,1fr))}
  .split{grid-template-columns: minmax(0,1fr)}
  .footer-inner{grid-template-columns:1fr}
  .section-head.row{flex-direction:column;align-items:flex-start}
}

@media (max-width: 560px){
  .topbar-inner{flex-direction:column;gap:6px;align-items:flex-start}
  .title{font-size:24px}
  .slide{min-height:520px}
  .cards-3{grid-template-columns:1fr}
}