/* ========== 基础 ========== */
*{margin:0;padding:0;box-sizing:border-box}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;color:#2c3e50;line-height:1.7;background:#f7f9fc}
a{text-decoration:none;color:inherit}
img{max-width:100%;display:block}
.container{max-width:1200px;margin:0 auto;padding:0 20px}
h1,h2,h3,h4{line-height:1.3;color:#1a2b4a}

/* ========== 头部 ========== */
.site-header{background:#fff;box-shadow:0 2px 12px rgba(0,0,0,.06);position:sticky;top:0;z-index:100}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:70px}
.logo{display:flex;align-items:center;gap:10px}
.logo-mark{width:42px;height:42px;background:linear-gradient(135deg,#1e5799,#2989d8);color:#fff;display:flex;align-items:center;justify-content:center;font-size:24px;font-weight:700;border-radius:8px}
.logo-text{font-size:20px;font-weight:700;color:#1a2b4a;display:flex;flex-direction:column;line-height:1.1}
.logo-text small{font-size:10px;color:#8aa0c0;font-weight:400;letter-spacing:1px}
.main-nav{display:flex;gap:28px}
.main-nav a{font-size:15px;color:#445;transition:color .2s}
.main-nav a:hover{color:#1e6fd9}
.header-phone{display:flex;align-items:center;gap:8px;background:#eaf3ff;padding:8px 16px;border-radius:24px}
.phone-icon{font-size:18px}
.phone-num{font-weight:700;color:#1e5799;font-size:15px}

/* ========== Hero ========== */
.hero{background:linear-gradient(135deg,#0f2c5a 0%,#1e5799 60%,#2989d8 100%);color:#fff;padding:90px 0;position:relative;overflow:hidden}
.hero::after{content:"";position:absolute;right:-100px;top:-100px;width:500px;height:500px;background:radial-gradient(circle,rgba(255,255,255,.08),transparent 70%);border-radius:50%}
.hero h1{color:#fff;font-size:42px;margin-bottom:20px;max-width:700px}
.hero h1 span{color:#ffd166}
.hero p{font-size:18px;opacity:.92;max-width:640px;margin-bottom:32px}
.hero-btns{display:flex;gap:16px;flex-wrap:wrap}
.btn{display:inline-block;padding:14px 32px;border-radius:6px;font-size:16px;font-weight:600;transition:all .2s}
.btn-primary{background:#ffd166;color:#1a2b4a}
.btn-primary:hover{background:#ffc233;transform:translateY(-2px)}
.btn-outline{border:2px solid #fff;color:#fff}
.btn-outline:hover{background:#fff;color:#1e5799}

/* ========== 通用区块 ========== */
.section{padding:80px 0}
.section-title{text-align:center;margin-bottom:50px}
.section-title h2{font-size:34px;margin-bottom:12px}
.section-title p{color:#6b7c93;font-size:16px}
.section-title .bar{width:60px;height:4px;background:#1e6fd9;margin:16px auto 0;border-radius:2px}

/* 服务卡片 */
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.card{background:#fff;border-radius:10px;padding:30px;box-shadow:0 2px 12px rgba(0,0,0,.04);transition:transform .2s,box-shadow .2s}
.card:hover{transform:translateY(-4px);box-shadow:0 12px 28px rgba(30,87,153,.12)}
.card .icon{font-size:40px;margin-bottom:16px}
.card h3{font-size:20px;margin-bottom:10px}
.card p{color:#6b7c93;font-size:14px}

/* 优势条 */
.advantages{background:#fff}
.adv-item{text-align:center;padding:20px}
.adv-item .num{font-size:36px;font-weight:700;color:#1e6fd9}
.adv-item .label{color:#6b7c93;margin-top:6px}

/* 城市网格 */
.city-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
.city-item{background:#fff;padding:18px;text-align:center;border-radius:8px;box-shadow:0 1px 6px rgba(0,0,0,.05);transition:all .2s;border-left:3px solid transparent}
.city-item:hover{border-left-color:#1e6fd9;transform:translateX(4px)}
.city-item a{display:block}
.city-item .cname{font-size:17px;font-weight:600;color:#1a2b4a}
.city-item .ceng{font-size:11px;color:#9aa8bd;letter-spacing:1px}

/* 文章列表 */
.article-list{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.article-card{background:#fff;border-radius:10px;overflow:hidden;box-shadow:0 2px 12px rgba(0,0,0,.05);transition:transform .2s}
.article-card:hover{transform:translateY(-4px)}
.article-thumb{height:180px;background:linear-gradient(135deg,#1e5799,#2989d8);display:flex;align-items:center;justify-content:center;color:#fff;font-size:40px}
.article-body{padding:22px}
.article-body .date{color:#9aa8bd;font-size:13px;margin-bottom:8px}
.article-body h3{font-size:18px;margin-bottom:10px;line-height:1.4}
.article-body p{color:#6b7c93;font-size:14px}

/* 问答 */
.faq-item{background:#fff;border-radius:8px;margin-bottom:14px;box-shadow:0 1px 6px rgba(0,0,0,.04);overflow:hidden}
.faq-q{padding:18px 24px;cursor:pointer;font-weight:600;display:flex;justify-content:space-between;align-items:center}
.faq-q:hover{background:#f4f8ff}
.faq-q::after{content:"+";font-size:22px;color:#1e6fd9;font-weight:300}
.faq-item.open .faq-q::after{content:"−"}
.faq-a{padding:0 24px;max-height:0;overflow:hidden;transition:all .3s;color:#556}
.faq-item.open .faq-a{padding:0 24px 20px;max-height:500px}

/* 联系区 */
.contact{background:linear-gradient(135deg,#0f2c5a,#1e5799);color:#fff;text-align:center}
.contact h2{color:#fff}
.contact .big-phone{font-size:48px;font-weight:700;color:#ffd166;margin:20px 0;letter-spacing:2px}
.contact p{opacity:.9;margin-bottom:10px}

/* 城市详情页 */
.city-hero{background:linear-gradient(135deg,#0f2c5a,#2989d8);color:#fff;padding:60px 0}
.city-hero h1{color:#fff;font-size:38px;margin-bottom:12px}
.city-hero .breadcrumb{opacity:.8;font-size:14px}
.city-body{padding:60px 0}
.city-body h2{font-size:26px;margin:30px 0 16px;padding-left:12px;border-left:4px solid #1e6fd9}
.city-body p{margin-bottom:14px;color:#445}
.service-list{display:grid;grid-template-columns:repeat(2,1fr);gap:14px;margin:20px 0}
.service-list li{background:#fff;padding:14px 18px;border-radius:6px;list-style:none;box-shadow:0 1px 4px rgba(0,0,0,.04)}

/* 文章详情 */
.article-detail{background:#fff;padding:50px;border-radius:10px;box-shadow:0 2px 12px rgba(0,0,0,.05);margin:40px auto;max-width:900px}
.article-detail h1{font-size:30px;margin-bottom:14px}
.article-detail .meta{color:#9aa8bd;font-size:14px;margin-bottom:24px;padding-bottom:20px;border-bottom:1px solid #eee}
.article-detail .content{font-size:16px;line-height:1.9}
.article-detail .content h2{font-size:22px;margin:24px 0 12px}
.article-detail .content p{margin-bottom:14px}

/* ========== 后台 ========== */
.admin-wrap{max-width:1000px;margin:40px auto;padding:0 20px}
.admin-box{background:#fff;border-radius:10px;padding:30px;box-shadow:0 2px 12px rgba(0,0,0,.06)}
.admin-box h2{margin-bottom:20px}
.form-row{margin-bottom:16px}
.form-row label{display:block;margin-bottom:6px;font-weight:600;font-size:14px}
.form-row input,.form-row textarea,.form-row select{width:100%;padding:10px 12px;border:1px solid #d8e0ec;border-radius:6px;font-size:15px;font-family:inherit}
.form-row textarea{min-height:400px;resize:vertical}
.btn-admin{background:#1e6fd9;color:#fff;padding:10px 24px;border:none;border-radius:6px;cursor:pointer;font-size:15px}
.btn-admin:hover{background:#155ab8}
.btn-danger{background:#e74c3c}
.btn-sm{padding:6px 14px;font-size:13px}
.admin-table{width:100%;border-collapse:collapse}
.admin-table th,.admin-table td{padding:12px;border-bottom:1px solid #eef2f8;text-align:left}
.admin-table th{background:#f4f8ff;font-weight:600}
.admin-actions{display:flex;gap:8px}
.admin-nav{background:#1a2b4a;color:#fff;padding:14px 0;margin-bottom:30px}
.admin-nav .container{display:flex;justify-content:space-between;align-items:center}
.admin-nav a{color:#fff;margin-left:20px;opacity:.85}
.admin-nav a:hover{opacity:1}
.login-box{max-width:400px;margin:80px auto;background:#fff;padding:40px;border-radius:10px;box-shadow:0 4px 20px rgba(0,0,0,.1)}

/* 浮动电话 */
.float-call{position:fixed;right:20px;bottom:30px;width:56px;height:56px;background:#ffd166;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:26px;box-shadow:0 4px 16px rgba(0,0,0,.2);z-index:99}

/* 底部 */
.site-footer{background:#1a2b4a;color:#b8c5d9;padding:60px 0 0;margin-top:60px}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1.5fr;gap:40px;padding-bottom:40px}
.footer-logo{font-size:20px;color:#fff;font-weight:700;margin-bottom:14px}
.footer-desc{font-size:14px;line-height:1.8}
.site-footer h4{color:#fff;font-size:16px;margin-bottom:16px}
.footer-links{list-style:none}
.footer-links li{margin-bottom:8px}
.footer-links a{color:#b8c5d9;font-size:14px}
.footer-links a:hover{color:#ffd166}
.footer-contact{font-size:14px;margin-bottom:8px}
.footer-contact a{color:#ffd166}
.footer-bottom{border-top:1px solid rgba(255,255,255,.1);padding:18px 0;font-size:13px;text-align:center}

/* 响应式 */
@media(max-width:900px){
  .main-nav{display:none}
  .grid-3,.grid-4,.article-list{grid-template-columns:1fr}
  .city-grid{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:1fr 1fr}
  .hero h1{font-size:30px}
  .contact .big-phone{font-size:32px}
  .service-list{grid-template-columns:1fr}
}