/* 导航百科总站样式 v3 */
*{margin:0;padding:0;box-sizing:border-box}
:root{
    --primary:#7c3aed;--primary-dark:#6d28d9;--primary-light:#ede9fe;
    --bg:#f0f4f8;--card-bg:#ffffff;--text:#1e293b;--text-s:#64748b;
    --border:#e2e8f0;--shadow:0 1px 3px rgba(0,0,0,.08);--shadow-md:0 4px 12px rgba(0,0,0,.1);
    --radius:14px;--radius-sm:10px;
}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"PingFang SC","Microsoft YaHei",sans-serif;font-size:16px;line-height:1.6;color:var(--text);background:var(--bg);-webkit-font-smoothing:antialiased}
.header{background:linear-gradient(135deg,#5b21b6 0%,#7c3aed 50%,#a78bfa 100%);padding:40px 20px 32px;color:#fff;text-align:center;position:sticky;top:0;z-index:100;box-shadow:0 4px 20px rgba(91,33,182,.35)}
.header-inner{max-width:960px;margin:0 auto}
.site-title{font-size:36px;font-weight:800;margin-bottom:8px;letter-spacing:2px}
.site-desc{font-size:15px;color:rgba(255,255,255,.85);margin-bottom:20px}
.search-box{display:flex;justify-content:center;gap:8px;max-width:540px;margin:0 auto}
#searchInput{flex:1;padding:12px 18px;border:none;border-radius:24px;font-size:15px;outline:none;background:rgba(255,255,255,.95);color:var(--text)}
#searchInput:focus{box-shadow:0 0 0 3px rgba(255,255,255,.3)}
#searchBtn{padding:12px 28px;background:#f59e0b;color:#fff;border:none;border-radius:24px;cursor:pointer;font-size:15px;font-weight:600;transition:all .2s}
#searchBtn:hover{background:#d97706}
.main-content{max-width:960px;margin:24px auto;padding:0 16px}
.category{margin-bottom:18px;background:var(--card-bg);border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden}
.category:hover{box-shadow:var(--shadow-md)}
.category-header{padding:15px 20px;cursor:pointer;display:flex;justify-content:space-between;align-items:center;transition:background .15s;user-select:none}
.category-header:hover{background:#f1f5f9}
.category-name{font-size:18px;font-weight:600;color:var(--text);display:flex;align-items:center;gap:8px}
.category-name .icon{font-size:22px}
.category-toggle{font-size:12px;color:var(--primary);padding:3px 10px;background:var(--primary-light);border-radius:12px;font-weight:600}
.category-links{padding:4px 20px 18px;display:none}
.category-links.active{display:block}
.link-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:8px}
.link-item{border-radius:var(--radius-sm);transition:all .15s}
.link-item a{display:flex;align-items:center;gap:6px;padding:10px 14px;color:var(--primary);text-decoration:none;font-size:14px;border-radius:var(--radius-sm);transition:all .15s}
.link-item a::before{content:"›";color:#cbd5e1;font-weight:700;font-size:16px;flex-shrink:0}
.link-item a:hover{background:var(--primary-light);color:var(--primary-dark);transform:translateX(2px)}
.link-item a:hover::before{color:var(--primary)}
.link-item.hidden{display:none}
.no-results{text-align:center;padding:48px 20px;color:var(--text-s)}
.no-results::before{content:"🔍";display:block;font-size:40px;margin-bottom:12px}
.city-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(130px,1fr));gap:10px}
.city-item a{display:flex;flex-direction:column;align-items:center;gap:4px;padding:14px 8px;background:linear-gradient(135deg,#eff6ff,#dbeafe);color:#1d4ed8;text-decoration:none;font-size:13px;font-weight:600;border-radius:var(--radius-sm);transition:all .2s;text-align:center}
.city-item a::before{content:"🏙️";font-size:24px}
.city-item a:hover{background:linear-gradient(135deg,#dbeafe,#bfdbfe);transform:translateY(-2px);box-shadow:0 4px 10px rgba(37,99,235,.15)}
.city-item.hidden{display:none}
.footer{background:#1e293b;padding:28px 20px;text-align:center;margin-top:40px}
.footer-inner{max-width:960px;margin:0 auto}
.footer p{margin-bottom:8px;font-size:13px;color:#94a3b8}
.footer a{color:#a78bfa;text-decoration:none}
.footer a:hover{text-decoration:underline}
.disclaimer{color:#64748b!important;font-size:12px!important}
.back-to-top{position:fixed;right:20px;bottom:24px;width:46px;height:46px;background:var(--primary);color:#fff;border:none;border-radius:50%;cursor:pointer;font-size:22px;display:none;z-index:1000;box-shadow:0 4px 14px rgba(124,58,237,.4);transition:all .2s}
.back-to-top:hover{background:var(--primary-dark);transform:translateY(-2px)}
.back-to-top.show{display:flex;align-items:center;justify-content:center}
@media(max-width:768px){
    .header{padding:24px 16px 20px}
    .site-title{font-size:24px}
    .search-box{flex-direction:column}
    #searchBtn{width:100%}
    .link-grid,.city-grid{grid-template-columns:repeat(auto-fill,minmax(140px,1fr))}
}
@media(max-width:480px){
    .site-title{font-size:20px}
    .site-desc{font-size:12px}
    .city-grid{grid-template-columns:repeat(3,1fr);gap:6px}
    .city-item a{padding:10px 6px;font-size:12px}
}