/* ============================================================
   北京网联广域科技发展中心 - 留学服务官网
   配色方案：商务深蓝 #5
   #003399 主色  #3366CC 辅色  #FFCC00 强调  #FFFFFF 白
   #CCCCCC 浅灰  #000000 黑
   ============================================================ */

:root{
  --c-primary:#003399;
  --c-secondary:#3366CC;
  --c-accent:#FFCC00;
  --c-white:#FFFFFF;
  --c-gray:#CCCCCC;
  --c-black:#000000;
  --c-dark:#0a1a3a;
  --c-text:#333333;
  --c-text-light:#666666;
  --c-bg-soft:#F2F5FA;
  --c-border:#E0E6EE;
  --radius:6px;
  --shadow:0 2px 10px rgba(0,51,153,.08);
  --shadow-lg:0 8px 30px rgba(0,51,153,.15);
  --maxw:1200px;
}

*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  font-family:"Microsoft YaHei","PingFang SC","Helvetica Neue",Arial,sans-serif;
  color:var(--c-text);
  background:var(--c-white);
  line-height:1.7;
  font-size:15px;
}
a{color:inherit;text-decoration:none;transition:color .2s}
a:hover{color:var(--c-accent)}
img{max-width:100%;display:block}
ul,ol{list-style:none}
h1,h2,h3,h4{font-weight:700;line-height:1.3;color:var(--c-primary)}
h1{font-size:30px}
h2{font-size:24px}
h3{font-size:19px}
p{margin-bottom:12px}

.container{max-width:var(--maxw);margin:0 auto;padding:0 20px}

/* ---------- 顶部条 ---------- */
.topbar{background:var(--c-dark);color:#cdd6e6;font-size:13px}
.topbar .container{display:flex;justify-content:space-between;align-items:center;height:38px;flex-wrap:wrap}
.topbar a{color:#cdd6e6}
.topbar a:hover{color:var(--c-accent)}
.topbar .tb-right span{margin-left:16px}

/* ---------- Header / Nav ---------- */
.header{background:#fff;box-shadow:var(--shadow);position:sticky;top:0;z-index:100}
.header .container{display:flex;align-items:center;height:78px;gap:24px}
.logo{display:flex;align-items:center;gap:12px;flex-shrink:0}
.logo .mark{
  width:46px;height:46px;border-radius:8px;
  background:linear-gradient(135deg,var(--c-primary),var(--c-secondary));
  color:#fff;font-weight:700;font-size:20px;display:flex;align-items:center;justify-content:center;
}
.logo .txt strong{display:block;font-size:18px;color:var(--c-primary);letter-spacing:.5px}
.logo .txt small{font-size:11px;color:var(--c-text-light);letter-spacing:1px}
.nav{display:flex;gap:6px;margin-left:auto;align-items:center}
.nav a{
  padding:10px 16px;font-size:15px;color:var(--c-text);font-weight:500;
  border-radius:var(--radius);position:relative;
}
.nav a:hover,.nav a.active{color:var(--c-primary);background:var(--c-bg-soft)}
.nav a.active::after{
  content:"";position:absolute;left:16px;right:16px;bottom:4px;height:3px;
  background:var(--c-accent);border-radius:2px;
}
.menu-toggle{display:none;font-size:26px;background:none;border:none;color:var(--c-primary);cursor:pointer}

/* ---------- 面包屑 ---------- */
.crumb{background:var(--c-bg-soft);border-bottom:1px solid var(--c-border)}
.crumb .container{display:flex;align-items:center;height:46px;font-size:13px;color:var(--c-text-light)}
.crumb a{color:var(--c-secondary)}
.crumb span{margin:0 8px;color:var(--c-gray)}

/* ---------- Banner / Hero ---------- */
.hero{position:relative;height:480px;overflow:hidden;background:var(--c-dark)}
.hero img{width:100%;height:100%;object-fit:cover;opacity:.55}
.hero .hero-text{position:absolute;inset:0;display:flex;flex-direction:column;justify-content:center;align-items:flex-start;color:#fff}
.hero .hero-text .container{width:100%}
.hero h1{color:#fff;font-size:40px;margin-bottom:14px;text-shadow:0 2px 12px rgba(0,0,0,.4)}
.hero p{font-size:18px;color:#e8eef8;max-width:600px;margin-bottom:24px;text-shadow:0 1px 6px rgba(0,0,0,.4)}
.hero .btn{margin-top:6px}
.page-banner{position:relative;height:240px;overflow:hidden;background:var(--c-dark)}
.page-banner img{width:100%;height:100%;object-fit:cover;opacity:.5}
.page-banner .pb-text{position:absolute;inset:0;display:flex;flex-direction:column;justify-content:center;color:#fff}
.page-banner .pb-text .container{width:100%}
.page-banner h1{color:#fff;font-size:30px;margin-bottom:6px}
.page-banner p{color:#e8eef8;font-size:15px;margin:0}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-block;padding:11px 26px;border-radius:var(--radius);
  font-size:15px;font-weight:600;cursor:pointer;transition:all .2s;border:none;
}
.btn-primary{background:var(--c-primary);color:#fff}
.btn-primary:hover{background:var(--c-secondary);color:#fff;transform:translateY(-1px)}
.btn-accent{background:var(--c-accent);color:var(--c-black)}
.btn-accent:hover{background:#e6b800;color:#000}
.btn-outline{background:transparent;color:#fff;border:2px solid #fff}
.btn-outline:hover{background:#fff;color:var(--c-primary)}

/* ---------- 通用 section ---------- */
.section{padding:60px 0}
.section.gray{background:var(--c-bg-soft)}
.section-title{text-align:center;margin-bottom:42px}
.section-title h2{font-size:28px;margin-bottom:10px}
.section-title p{color:var(--c-text-light);font-size:15px;margin:0}
.section-title .bar{width:60px;height:4px;background:var(--c-accent);margin:12px auto 0;border-radius:2px}

/* ---------- 首页 - 服务卡片网格 ---------- */
.grid{display:grid;gap:24px}
.grid-4{grid-template-columns:repeat(4,1fr)}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-2{grid-template-columns:repeat(2,1fr)}

.service-card{
  background:#fff;border:1px solid var(--c-border);border-radius:var(--radius);
  overflow:hidden;transition:all .25s;box-shadow:var(--shadow);
}
.service-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg);border-color:var(--c-secondary)}
.service-card img{width:100%;height:180px;object-fit:cover}
.service-card .body{padding:18px 20px 22px}
.service-card h3{font-size:18px;margin-bottom:8px}
.service-card p{font-size:13.5px;color:var(--c-text-light);margin-bottom:12px}
.service-card .more{font-size:13px;color:var(--c-secondary);font-weight:600}

/* ---------- 优势区块 ---------- */
.advantage{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.adv-item{text-align:center;padding:30px 18px;background:#fff;border-radius:var(--radius);border-top:4px solid var(--c-accent);box-shadow:var(--shadow)}
.adv-item .num{font-size:32px;font-weight:700;color:var(--c-primary)}
.adv-item h3{font-size:17px;margin:10px 0 6px}
.adv-item p{font-size:13px;color:var(--c-text-light);margin:0}

/* ---------- 流程区块 ---------- */
.flow{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;position:relative}
.flow-item{text-align:center;padding:24px 16px;background:#fff;border-radius:var(--radius);box-shadow:var(--shadow);position:relative}
.flow-item .step{
  width:48px;height:48px;border-radius:50%;background:var(--c-primary);color:#fff;
  font-size:20px;font-weight:700;display:flex;align-items:center;justify-content:center;
  margin:0 auto 12px;
}
.flow-item h3{font-size:16px;margin-bottom:6px}
.flow-item p{font-size:13px;color:var(--c-text-light);margin:0}

/* ---------- 列表页 ---------- */
.list-page{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.list-card{
  background:#fff;border:1px solid var(--c-border);border-radius:var(--radius);
  overflow:hidden;transition:all .25s;box-shadow:var(--shadow);display:flex;flex-direction:column;
}
.list-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg);border-color:var(--c-secondary)}
.list-card img{width:100%;height:200px;object-fit:cover}
.list-card .body{padding:18px 20px 20px;flex:1;display:flex;flex-direction:column}
.list-card h3{font-size:17px;margin-bottom:8px}
.list-card .meta{font-size:12px;color:var(--c-text-light);margin-bottom:10px}
.list-card p{font-size:13px;color:var(--c-text-light);margin-bottom:12px;flex:1}
.list-card .more{font-size:13px;color:var(--c-secondary);font-weight:600}

/* ---------- 详情页布局 ---------- */
.detail-wrap{padding:50px 0}
.detail-grid{display:grid;grid-template-columns:1fr 300px;gap:36px}
.detail-main{background:#fff;border:1px solid var(--c-border);border-radius:var(--radius);padding:34px}
.detail-main h1{font-size:26px;margin-bottom:14px;line-height:1.4}
.detail-meta{display:flex;flex-wrap:wrap;gap:18px;font-size:13px;color:var(--c-text-light);border-bottom:1px solid var(--c-border);padding-bottom:16px;margin-bottom:22px}
.detail-meta span::before{content:"●";color:var(--c-accent);margin-right:6px;font-size:10px}
.detail-main .cover{width:100%;height:380px;object-fit:cover;border-radius:var(--radius);margin-bottom:24px}
.detail-main h2{font-size:20px;margin:24px 0 12px;padding-left:12px;border-left:4px solid var(--c-accent)}
.detail-main p{font-size:15px;color:#444;margin-bottom:14px;text-align:justify}
.detail-main ul{margin:0 0 14px 4px}
.detail-main ul li{position:relative;padding-left:22px;margin-bottom:8px;font-size:14.5px;color:#444}
.detail-main ul li::before{content:"";position:absolute;left:0;top:11px;width:8px;height:8px;background:var(--c-secondary);border-radius:50%}

/* 侧栏 */
.sidebar .widget{background:#fff;border:1px solid var(--c-border);border-radius:var(--radius);padding:22px;margin-bottom:24px}
.sidebar .widget h3{font-size:17px;margin-bottom:16px;padding-bottom:10px;border-bottom:2px solid var(--c-primary)}
.sidebar .widget ul li{border-bottom:1px dashed var(--c-border);padding:10px 0}
.sidebar .widget ul li:last-child{border-bottom:none}
.sidebar .widget ul li a{font-size:14px;display:block}
.sidebar .widget ul li a:hover{color:var(--c-secondary)}
.sidebar .contact-widget{background:linear-gradient(135deg,var(--c-primary),var(--c-secondary));color:#fff}
.sidebar .contact-widget h3{color:#fff;border-bottom-color:rgba(255,255,255,.3)}
.sidebar .contact-widget p{color:#e8eef8;font-size:14px;margin-bottom:8px}
.sidebar .contact-widget strong{color:var(--c-accent)}

/* ---------- 关于我们 ---------- */
.about-block{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:center}
.about-block img{width:100%;height:340px;object-fit:cover;border-radius:var(--radius);box-shadow:var(--shadow)}
.about-block h2{margin-bottom:14px}
.about-block p{font-size:15px;color:#444;margin-bottom:12px}
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;margin-top:40px}
.stat{text-align:center;padding:24px 10px;background:#fff;border-radius:var(--radius);box-shadow:var(--shadow);border-top:3px solid var(--c-accent)}
.stat .num{font-size:34px;font-weight:700;color:var(--c-primary)}
.stat .label{font-size:14px;color:var(--c-text-light);margin-top:4px}

.timeline{position:relative;padding-left:30px}
.timeline::before{content:"";position:absolute;left:8px;top:0;bottom:0;width:2px;background:var(--c-border)}
.timeline-item{position:relative;padding-bottom:26px}
.timeline-item::before{content:"";position:absolute;left:-26px;top:4px;width:14px;height:14px;border-radius:50%;background:var(--c-accent);border:3px solid var(--c-primary)}
.timeline-item .year{font-size:17px;font-weight:700;color:var(--c-primary)}
.timeline-item p{font-size:14px;color:#444;margin:4px 0 0}

/* ---------- 联系我们 ---------- */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:36px}
.contact-info .ci-item{display:flex;align-items:flex-start;gap:14px;margin-bottom:22px}
.contact-info .ci-item .ic{
  width:44px;height:44px;border-radius:8px;flex-shrink:0;
  background:var(--c-bg-soft);color:var(--c-primary);
  display:flex;align-items:center;justify-content:center;font-size:20px;font-weight:700;
}
.contact-info .ci-item h3{font-size:16px;margin-bottom:4px}
.contact-info .ci-item p{font-size:14px;color:#444;margin:0}
.map-box{background:#fff;border:1px solid var(--c-border);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow)}
.map-box iframe{width:100%;height:380px;border:0;display:block}
.form-box{background:#fff;border:1px solid var(--c-border);border-radius:var(--radius);padding:26px;box-shadow:var(--shadow)}
.form-box .form-group{margin-bottom:16px}
.form-box label{display:block;font-size:14px;margin-bottom:6px;font-weight:600;color:var(--c-text)}
.form-box input,.form-box textarea,.form-box select{
  width:100%;padding:10px 12px;border:1px solid var(--c-border);border-radius:var(--radius);
  font-size:14px;font-family:inherit;background:#fff;
}
.form-box input:focus,.form-box textarea:focus{outline:none;border-color:var(--c-secondary)}

/* ---------- CTA ---------- */
.cta{background:linear-gradient(135deg,var(--c-primary),var(--c-secondary));color:#fff;text-align:center;padding:60px 0;position:relative;overflow:hidden}
.cta h2{color:#fff;font-size:28px;margin-bottom:12px}
.cta p{color:#e8eef8;font-size:16px;margin-bottom:24px}
.cta .btn{margin:0 6px}

/* ---------- 分页 ---------- */
.pagination{display:flex;justify-content:center;gap:8px;margin-top:40px}
.pagination a,.pagination span{
  display:inline-flex;align-items:center;justify-content:center;
  min-width:38px;height:38px;padding:0 12px;border:1px solid var(--c-border);
  border-radius:var(--radius);font-size:14px;color:var(--c-text);background:#fff;
}
.pagination a:hover{border-color:var(--c-secondary);color:var(--c-secondary)}
.pagination .active{background:var(--c-primary);color:#fff;border-color:var(--c-primary)}

/* ---------- 页脚 ---------- */
.footer{background:var(--c-dark);color:#aab4cc;font-size:14px;padding:50px 0 0}
.footer .ft-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1.5fr;gap:36px;padding-bottom:36px;border-bottom:1px solid #1d2b4a}
.footer h4{color:#fff;font-size:16px;margin-bottom:16px}
.footer p{margin-bottom:8px;line-height:1.8}
.footer .ft-brand .logo .mark{background:var(--c-accent);color:var(--c-black)}
.footer .ft-brand .logo strong{color:#fff}
.footer .ft-brand .logo small{color:#aab4cc}
.footer .ft-links li{margin-bottom:8px}
.footer .ft-links a{color:#aab4cc}
.footer .ft-links a:hover{color:var(--c-accent)}
.footer .ft-contact p{margin-bottom:10px}
.footer .ft-contact strong{color:#fff}
.ft-bottom{padding:18px 0;text-align:center;font-size:13px;color:#8a96b3}
.ft-bottom a{color:#8a96b3}
.ft-bottom a:hover{color:var(--c-accent)}
.ft-bottom .icp{margin:0 8px}

/* ---------- 通用工具 ---------- */
.text-center{text-align:center}
.mt-30{margin-top:30px}
.back-top{position:fixed;right:24px;bottom:24px;width:44px;height:44px;background:var(--c-primary);color:#fff;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:20px;box-shadow:var(--shadow-lg);cursor:pointer;border:none}

/* ============================================================
   响应式 - 移动端适配
   ============================================================ */
@media (max-width:992px){
  .grid-4{grid-template-columns:repeat(2,1fr)}
  .grid-3,.list-page{grid-template-columns:repeat(2,1fr)}
  .advantage,.flow,.stats{grid-template-columns:repeat(2,1fr)}
  .detail-grid{grid-template-columns:1fr}
  .about-block,.contact-grid{grid-template-columns:1fr}
  .footer .ft-grid{grid-template-columns:1fr 1fr}
  .hero h1{font-size:30px}
  .hero p{font-size:16px}
}
@media (max-width:768px){
  body{font-size:14px}
  .nav{
    position:fixed;top:78px;left:0;right:0;background:#fff;
    flex-direction:column;gap:0;padding:8px 0;
    box-shadow:var(--shadow-lg);border-top:1px solid var(--c-border);
    transform:translateY(-150%);transition:transform .3s;max-height:calc(100vh - 78px);overflow-y:auto;
  }
  .nav.open{transform:translateY(0)}
  .nav a{width:100%;padding:14px 24px;border-radius:0}
  .nav a.active::after{display:none}
  .menu-toggle{display:block;margin-left:auto}
  .topbar .container{height:auto;padding:8px 20px;flex-direction:column;gap:4px;align-items:flex-start}
  .grid-4,.grid-3,.grid-2,.list-page,.advantage,.flow,.stats{grid-template-columns:1fr}
  .hero{height:340px}
  .hero h1{font-size:24px}
  .hero p{font-size:14px}
  .page-banner{height:160px}
  .page-banner h1{font-size:22px}
  .section{padding:40px 0}
  .section-title h2{font-size:22px}
  .footer .ft-grid{grid-template-columns:1fr}
  .detail-main{padding:20px}
  .detail-main .cover{height:220px}
}