:root{
  --blue-dark:#083a8c;
  --blue:#0a66c2;
  --blue-grad-start:#0a66c2;
  --blue-grad-end:#5cc8ff;
  --gold:#ffd666;
  --text:#111827;
  --muted:#6b7280;
  --bg:#f6f9ff;
  --card:#ffffff;
}
/* 在全局样式中添加（不在媒体查询内） */
.menu.open {
  display: flex;
}
img{max-width:100%}
*{box-sizing:border-box}
html,body{margin:0;padding:0;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Arial,sans-serif;line-height:1.65}
a{color:var(--blue);text-decoration:none}
a:hover{text-decoration:underline}
.nav{position:sticky;top:0;z-index:1000;background:linear-gradient(90deg,var(--blue-dark),var(--blue));color:#fff;box-shadow:0 6px 20px rgba(0,0,0,.14)}
.nav-inner{max-width:1140px;margin:0 auto;display:flex;align-items:center;justify-content:space-between;padding:12px 18px;gap:12px}
.brand{font-weight:800;letter-spacing:.2px}
.menu-btn{appearance:none;background:transparent;border:0;color:#fff;font-size:22px;line-height:1;padding:6px 10px;border-radius:10px;display:flex;align-items:center}
.menu{display:none;flex-direction:column;padding:8px 12px;background:rgba(255,255,255,.08)}
.menu a{padding:10px;border-radius:10px;color:#fff;font-weight:600;text-decoration:none}
.menu a:hover{background:rgba(255,255,255,.16);text-decoration:none}
.menu .active{background:rgba(255,255,255,.22)}
@media(min-width:900px){
  .menu{display:flex; /* 移除!important */
    flex-direction:row;
    background:transparent;
    padding:0;
    gap:10px
  }
  .menu a{padding:10px 12px}
  .menu-btn{display:none}

}
header.hero{background:linear-gradient(135deg,var(--blue-grad-start),var(--blue-grad-end));color:#fff;text-align:center;padding:92px 18px 80px;border-bottom-left-radius:22px;border-bottom-right-radius:22px}
header.hero h1{margin:0;font-size:clamp(28px,4.6vw,48px);font-weight:900}
header.hero p{margin:10px auto 0;opacity:.95;max-width:820px;font-size:clamp(14px,2.5vw,18px)}
.container{max-width:1140px;margin:0 auto;padding:0 16px}
.section{margin:22px auto;background:var(--card);border-radius:16px;box-shadow:0 10px 30px rgba(16,24,40,.06);padding:18px;opacity:0;transform:translateY(28px);transition:all .8s ease}
.section.visible{opacity:1;transform:translateY(0)}
.section h2{margin:4px 0 10px;text-align:center;color:var(--blue);font-size:clamp(20px,4.6vw,30px)}
.section h3{margin:14px 0 6px;color:#0b4ea2;font-size:clamp(16px,3.8vw,22px)}
.section p,.section li{font-size:clamp(14px,3.6vw,17px)}
ul{padding-left:18px;margin:6px 0}
.badge{display:inline-block;background:#e6f2ff;color:#0b4ea2;border:1px solid #b3dcff;padding:4px 10px;border-radius:999px;font-size:12px;margin:4px 6px 8px 0}
.grid{display:grid;grid-template-columns:1fr;gap:14px}
@media(min-width:900px){.grid{grid-template-columns:1fr 1fr}}
.kpis{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}
.kpis .k{background:#f0f7ff;border:1px solid #cfe6ff;border-radius:14px;padding:12px;text-align:center}
footer{background:var(--blue-dark);color:#fff;text-align:center;padding:20px 12px;margin-top:26px;font-size:13px}
#backToTop{position:fixed;right:16px;bottom:18px;background:var(--blue);color:#fff;border:0;border-radius:999px;padding:10px 14px;font-weight:800;box-shadow:0 10px 24px rgba(0,0,0,.18);display:none;cursor:pointer}
#backToTop:active{transform:scale(.98)}
.mt{margin-top:10px}
.lead{font-size:1.05em}