:root{--blue:#0e4d9c;--blue-d:#0a3a76;--blue-l:#e8f0fa;--line:#dce6f3}
*{box-sizing:border-box}
body{margin:0;font-size:15px;line-height:1.7;color:#222;background:#f5f8fc;font-family:"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;-webkit-text-size-adjust:100%}
a{color:var(--blue)}
img{max-width:100%}
.wx-thumb{position:absolute;left:-9999px;top:0;width:1px;height:1px}
.wrap{max-width:1080px;margin:0 auto;padding:0 16px}

/* 顶栏 */
.topbar{background:#fff;box-shadow:0 1px 0 rgba(0,0,0,.06);position:sticky;top:0;z-index:50}
.topbar .wrap{display:flex;align-items:center;gap:10px;padding-top:9px;padding-bottom:9px}
.logo{display:flex;align-items:center;gap:9px;text-decoration:none;min-width:0}
.logo img{width:38px;height:38px;border-radius:9px;flex:none;box-shadow:0 1px 3px rgba(0,0,0,.16)}
.logo-txt{min-width:0;display:flex;flex-direction:column;line-height:1.3}
.logo-name{font-size:16.5px;font-weight:700;color:#1c1c1c;letter-spacing:.5px;white-space:nowrap}
.logo-sub{font-style:normal;font-size:11.5px;color:#8a94a3;white-space:nowrap}

/* 头图 */
.hero{position:relative;color:#fff;background:#0b3d80 url("../images/banner.jpg") center/cover no-repeat;overflow:hidden}
.hero::before{content:"";position:absolute;inset:0;background:linear-gradient(100deg,rgba(7,38,84,.88) 0%,rgba(10,58,118,.72) 46%,rgba(14,77,156,.38) 100%)}
.hero .wrap{position:relative;padding-top:52px;padding-bottom:56px}
.kick{display:inline-block;background:rgba(214,168,74,.92);color:#fff;font-size:13.5px;padding:3px 14px;border-radius:999px;letter-spacing:1px}
.hero h1{margin:14px 0 10px;font-size:clamp(25px,4.6vw,38px);line-height:1.35;font-weight:700;text-shadow:0 2px 8px rgba(4,26,60,.45)}
.hero h1 .em{color:#ffd98a}
.hero p.sub{margin:0;max-width:660px;color:#d9e6f7;font-size:15px}
.hero p.sub b{color:#fff}

/* 名词解释 */
.sec{max-width:1080px;margin:0 auto;padding:30px 16px 6px}
.sec-h2{display:flex;align-items:center;gap:10px;margin:0 0 6px;font-size:21px;color:#15325e}
.sec-h2::before{content:"";flex:none;width:5px;height:20px;border-radius:3px;background:var(--blue)}
.sec-desc{margin:0 0 16px;color:#6d7b8f;font-size:13.5px}
.terms{display:grid;gap:14px;grid-template-columns:repeat(auto-fit,minmax(230px,1fr))}
.term{background:#fff;border:1px solid var(--line);border-top:3px solid var(--blue);border-radius:10px;padding:14px 16px}
.term b{display:block;color:var(--blue-d);font-size:15.5px;margin-bottom:5px}
.term p{margin:0;color:#5b6a80;font-size:13.2px;line-height:1.75}

/* 分区导航 */
.region-nav{position:sticky;top:50px;z-index:40;margin-top:22px;background:rgba(245,248,252,.96);border-bottom:1px solid var(--line)}
.rn-in{max-width:1080px;margin:0 auto;padding:8px 16px;display:flex;gap:8px;overflow-x:auto;-webkit-overflow-scrolling:touch;scrollbar-width:none}
.rn-in::-webkit-scrollbar{display:none}
.rn-chip{flex:none;padding:5px 14px;border-radius:999px;background:#fff;color:var(--blue);border:1px solid #c9d9ee;font-size:13.5px;text-decoration:none;white-space:nowrap}
.rn-chip:hover{background:var(--blue);border-color:var(--blue);color:#fff}

/* 各省展示 */
.region{max-width:1080px;margin:0 auto;padding:26px 16px 4px;scroll-margin-top:105px}
.region h2{display:flex;align-items:baseline;gap:10px;margin:0 0 4px;font-size:20px;color:#15325e}
.region h2 small{font-size:12.5px;color:#93a2b5;font-weight:400}
.prov-grid{margin-top:12px;display:grid;gap:12px;grid-template-columns:repeat(auto-fill,minmax(165px,1fr))}
.prov-card{position:relative;display:flex;flex-direction:column;gap:2px;background:#fff;border:1px solid var(--line);border-radius:10px;padding:13px 14px 11px;text-decoration:none;color:#222;transition:transform .18s,box-shadow .18s,border-color .18s}
.prov-card:hover{border-color:var(--blue);box-shadow:0 6px 16px rgba(14,77,156,.14);transform:translateY(-2px)}
.p-name{font-size:17px;font-weight:700;color:var(--blue-d);line-height:1.4}
.p-sub{font-size:12.8px;color:#7a8aa0;line-height:1.5}
.p-arrow{position:absolute;right:12px;top:12px;color:#b9c8dc;font-size:15px;line-height:1;transition:color .18s}
.prov-card:hover .p-arrow{color:var(--blue)}

/* 页脚 */
footer{margin-top:34px;background:#0f2f5c;color:#b9cbe3;font-size:12.8px;line-height:1.8}
footer .wrap{padding-top:22px;padding-bottom:26px}
footer h3{margin:0 0 8px;color:#fff;font-size:15px}
footer p{margin:0 0 6px}
.stat-line{padding:10px 0;text-align:center}

/* 返回顶部 */
#backtop{position:fixed;right:14px;bottom:26px;z-index:60;width:42px;height:42px;border:0;border-radius:50%;background:var(--blue);color:#fff;font-size:17px;cursor:pointer;box-shadow:0 4px 12px rgba(14,77,156,.35);opacity:0;pointer-events:none;transition:opacity .25s}
#backtop.show{opacity:1;pointer-events:auto}

@media (max-width:699px){
  .topbar{position:static}
  .topbar .wrap{gap:8px}
  .logo img{width:34px;height:34px}
  .logo-name{font-size:16px}
  .logo-sub{display:none}
  .region-nav{position:static}
  .hero .wrap{padding-top:38px;padding-bottom:42px}
  .hero p.sub{font-size:14px}
  .sec{padding-top:24px}
  .sec-h2{font-size:19px}
  .prov-grid{grid-template-columns:repeat(2,1fr);gap:10px}
  .region{padding-top:20px}
  #backtop{display:none}
}