/* ============================================================
   起点智联 · 城市站样式（北京样板站）
   设计语言：深蓝科技风 + 蓝青渐变，干净留白，移动端优先
   ============================================================ */
:root{
  --brand:#2563eb;          /* 主蓝 */
  --brand-2:#06b6d4;        /* 青 */
  --brand-dark:#1e40af;
  --grad:linear-gradient(120deg,#2563eb 0%,#06b6d4 100%);
  --grad-soft:linear-gradient(120deg,rgba(37,99,235,.12),rgba(6,182,212,.12));
  --ink:#0f172a;
  --ink-2:#334155;
  --muted:#64748b;
  --muted-2:#94a3b8;
  --bg:#ffffff;
  --bg-soft:#f6f8fb;
  --bg-navy:#0b1220;
  --bg-navy-2:#101a30;
  --line:#e6eaf1;
  --card:#ffffff;
  --radius:16px;
  --radius-sm:10px;
  --shadow-sm:0 1px 3px rgba(15,23,42,.06),0 1px 2px rgba(15,23,42,.04);
  --shadow:0 10px 30px -10px rgba(15,23,42,.18);
  --shadow-lg:0 24px 60px -18px rgba(15,23,42,.28);
  --font:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei","Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{font-family:var(--font);color:var(--ink-2);line-height:1.75;font-size:16px;background:var(--bg);overflow-x:hidden}
img{max-width:100%;height:auto;display:block}
a{color:var(--brand);text-decoration:none;transition:color .2s}
a:hover{color:var(--brand-dark)}
ul{list-style:none}
h1,h2,h3,h4{color:var(--ink);line-height:1.3;font-weight:700}
.container{max-width:1180px;margin:0 auto;padding:0 24px}

/* ---------- 按钮 ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:13px 28px;border-radius:999px;font-weight:600;font-size:15px;border:1px solid transparent;cursor:pointer;transition:.25s;line-height:1.2}
.btn-primary{background:var(--grad);color:#fff;box-shadow:0 8px 22px -8px rgba(37,99,235,.6)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 14px 30px -8px rgba(37,99,235,.7);color:#fff}
.btn-ghost{background:transparent;color:var(--ink);border-color:var(--line)}
.btn-ghost:hover{border-color:var(--brand);color:var(--brand);transform:translateY(-2px)}
.btn-light{background:#fff;color:var(--brand-dark)}
.btn-light:hover{transform:translateY(-2px);color:var(--brand-dark)}
.btn-sm{padding:9px 18px;font-size:14px}
.btn-lg{padding:15px 34px;font-size:16px}
.btn-block{width:100%}

/* ---------- 顶部导航 ---------- */
.site-header{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.98);border-bottom:1px solid var(--line)}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:70px}
.brand{display:flex;align-items:center;gap:12px;color:var(--ink)}
.brand-mark{width:40px;height:40px;border-radius:11px;background:var(--grad);color:#fff;font-weight:800;font-size:20px;display:flex;align-items:center;justify-content:center;box-shadow:0 6px 16px -6px rgba(37,99,235,.7)}
.brand-text{display:flex;flex-direction:column;line-height:1.15}
.brand-text strong{font-size:19px;letter-spacing:.5px}
.brand-text small{font-size:11px;color:var(--muted);letter-spacing:1px}
.main-nav ul{display:flex;align-items:center;gap:6px}
.main-nav>ul>li{position:relative}
.main-nav>ul>li>a{display:flex;align-items:center;gap:5px;padding:10px 14px;color:var(--ink-2);font-size:15px;font-weight:500;border-radius:8px}
.main-nav>ul>li>a:hover,.main-nav>ul>li>a.active{color:var(--brand);background:var(--bg-soft)}
.caret{width:0;height:0;border-left:4px solid transparent;border-right:4px solid transparent;border-top:5px solid currentColor;opacity:.6}
.drop{position:absolute;top:calc(100% + 8px);left:0;min-width:220px;background:#fff;border:1px solid var(--line);border-radius:12px;box-shadow:var(--shadow);padding:8px;opacity:0;visibility:hidden;transform:translateY(8px);transition:.22s}
.has-drop:hover .drop{opacity:1;visibility:visible;transform:translateY(0)}
.drop a{display:flex;justify-content:space-between;align-items:center;padding:10px 14px;border-radius:8px;color:var(--ink-2);font-size:14px}
.drop a:hover{background:var(--grad-soft);color:var(--brand)}
.drop a small{color:var(--muted-2);font-size:12px}
.header-cta{display:flex;align-items:center;gap:12px}
.nav-toggle{display:none;width:42px;height:42px;border:1px solid var(--line);border-radius:10px;background:#fff;cursor:pointer;flex-direction:column;align-items:center;justify-content:center;gap:4px}
.nav-toggle span{width:20px;height:2px;background:var(--ink);border-radius:2px;transition:.25s}

/* ---------- Hero ---------- */
.hero{position:relative;background:var(--bg-navy);color:#cbd5e1;overflow:hidden}
.hero::before{content:"";position:absolute;inset:0;background:
  radial-gradient(600px 400px at 80% -10%,rgba(37,99,235,.45),transparent 60%),
  radial-gradient(500px 400px at 10% 110%,rgba(6,182,212,.3),transparent 60%),
  linear-gradient(180deg,#0b1220 0%,#0e1a33 100%)}
.hero-grid{position:absolute;inset:0;background-image:linear-gradient(rgba(255,255,255,.05) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.05) 1px,transparent 1px);background-size:46px 46px;mask-image:radial-gradient(ellipse at center,#000 30%,transparent 78%)}
.hero-inner{position:relative;padding:90px 0 0;text-align:center}
.hero-badge{display:inline-flex;align-items:center;gap:8px;padding:7px 16px;border-radius:999px;background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.15);font-size:13px;color:#93c5fd;margin-bottom:24px}
.hero-badge .dot{width:7px;height:7px;border-radius:50%;background:var(--brand-2);box-shadow:0 0 0 4px rgba(6,182,212,.2)}
.hero h1{color:#fff;font-size:44px;letter-spacing:.5px;max-width:820px;margin:0 auto 20px}
.hero h1 .grad{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero-sub{font-size:18px;color:#cbd5e1;max-width:680px;margin:0 auto 32px}
.hero-cta{display:flex;gap:16px;justify-content:center;flex-wrap:wrap}
.hero-tags{display:flex;gap:10px;justify-content:center;flex-wrap:wrap;margin-top:28px}
.hero-tags span{padding:6px 14px;border-radius:999px;background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.12);font-size:13px;color:#94a3b8}
.hero-stats{position:relative;display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:rgba(255,255,255,.09);border:1px solid rgba(255,255,255,.1);border-bottom:0;border-radius:20px 20px 0 0;margin-top:64px;overflow:hidden}
.hero-stat{background:rgba(11,18,32,.65);padding:26px 12px}
.hero-stat strong{display:block;font-size:30px;color:#fff;font-weight:800}
.hero-stat strong i{font-style:normal;color:var(--brand-2)}
.hero-stat span{font-size:13px;color:#94a3b8}

/* ---------- 通用区块 ---------- */
.section{padding:84px 0}
.section.alt{background:var(--bg-soft)}
.sec-head{text-align:center;max-width:680px;margin:0 auto 52px}
.sec-head .kicker{display:inline-block;font-size:13px;font-weight:700;letter-spacing:2px;color:var(--brand);text-transform:uppercase;margin-bottom:12px}
.sec-head h2{font-size:32px;margin-bottom:14px}
.sec-head p{color:var(--muted);font-size:16px}

/* ---------- 服务卡片 ---------- */
.cards{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.card{position:relative;background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:28px;transition:.28s;overflow:hidden}
.card:hover{transform:translateY(-6px);box-shadow:var(--shadow);border-color:transparent}
.card::before{content:"";position:absolute;inset:0 0 auto 0;height:3px;background:var(--grad);opacity:0;transition:.28s}
.card:hover::before{opacity:1}
.card .icon{width:52px;height:52px;border-radius:13px;background:var(--grad-soft);display:flex;align-items:center;justify-content:center;margin-bottom:18px;color:var(--brand)}
.card .icon svg{width:26px;height:26px}
.card h3{font-size:18px;margin-bottom:8px}
.card h3 a{color:var(--ink)}
.card h3 a:hover{color:var(--brand)}
.card p{font-size:14px;color:var(--muted);margin-bottom:14px}
.card .link{font-size:14px;font-weight:600;display:inline-flex;align-items:center;gap:5px}
.card .link svg{width:16px;height:16px;transition:.2s}
.card:hover .link svg{transform:translateX(4px)}

/* ---------- 特性 / 为什么选我们 ---------- */
.split{display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:center}
.split .text h2{font-size:30px;margin-bottom:18px}
.split .text>p{color:var(--muted);margin-bottom:26px}
.feature-list li{display:flex;gap:14px;margin-bottom:18px}
.feature-list .ic{flex:none;width:40px;height:40px;border-radius:10px;background:var(--grad-soft);display:flex;align-items:center;justify-content:center;color:var(--brand)}
.feature-list .ic svg{width:20px;height:20px}
.feature-list h4{font-size:16px;margin-bottom:3px}
.feature-list p{font-size:14px;color:var(--muted)}
.split-media{position:relative}
.media-box{background:var(--bg-navy);border-radius:var(--radius);padding:36px;color:#cbd5e1;box-shadow:var(--shadow-lg);position:relative;overflow:hidden}
.media-box::after{content:"";position:absolute;width:260px;height:260px;border-radius:50%;background:radial-gradient(circle,rgba(37,99,235,.5),transparent 70%);top:-80px;right:-80px}
.media-box .num{font-size:42px;font-weight:800;color:#fff;margin-bottom:6px}
.media-box .num i{font-style:normal;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.media-box p{font-size:14px;color:#94a3b8}
.media-stats{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-top:22px}

/* ---------- 流程 ---------- */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:22px;counter-reset:step}
.step{position:relative;background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:28px;transition:.28s}
.step:hover{transform:translateY(-5px);box-shadow:var(--shadow)}
.step .no{width:44px;height:44px;border-radius:12px;background:var(--grad);color:#fff;font-weight:800;font-size:18px;display:flex;align-items:center;justify-content:center;margin-bottom:16px}
.step h4{font-size:17px;margin-bottom:8px}
.step p{font-size:14px;color:var(--muted)}

/* ---------- 案例 ---------- */
.case-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.case-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;transition:.28s}
.case-card:hover{transform:translateY(-6px);box-shadow:var(--shadow)}
.case-cover{height:170px;position:relative;display:flex;align-items:center;justify-content:center}
.case-cover svg{width:52px;height:52px;color:rgba(255,255,255,.9)}
.case-body{padding:22px}
.case-body .tag{display:inline-block;padding:3px 12px;border-radius:999px;background:var(--grad-soft);color:var(--brand);font-size:12px;font-weight:600;margin-bottom:10px}
.case-body h3{font-size:17px;margin-bottom:8px}
.case-body p{font-size:14px;color:var(--muted)}
.cover-a{background:linear-gradient(135deg,#1e3a8a,#2563eb)}
.cover-b{background:linear-gradient(135deg,#0e7490,#06b6d4)}
.cover-c{background:linear-gradient(135deg,#4c1d95,#7c3aed)}
.cover-d{background:linear-gradient(135deg,#065f46,#10b981)}
.cover-e{background:linear-gradient(135deg,#9a3412,#f97316)}
.cover-f{background:linear-gradient(135deg,#831843,#ec4899)}

/* ---------- FAQ ---------- */
.faq{max-width:780px;margin:0 auto}
.faq-item{border:1px solid var(--line);border-radius:var(--radius-sm);margin-bottom:14px;background:#fff;overflow:hidden}
.faq-q{width:100%;text-align:left;background:none;border:0;padding:20px 22px;font-size:16px;font-weight:600;color:var(--ink);cursor:pointer;display:flex;justify-content:space-between;align-items:center;gap:16px}
.faq-q .plus{flex:none;width:26px;height:26px;border-radius:8px;background:var(--bg-soft);display:flex;align-items:center;justify-content:center;font-size:18px;color:var(--brand);transition:.25s}
.faq-item.open .plus{transform:rotate(45deg);background:var(--grad);color:#fff}
.faq-a{max-height:0;overflow:hidden;transition:max-height .3s ease}
.faq-a p{padding:0 22px 20px;color:var(--muted);font-size:14px}

/* ---------- CTA ---------- */
.cta-band{position:relative;background:var(--grad);border-radius:24px;padding:56px 40px;text-align:center;color:#fff;overflow:hidden}
.cta-band::before{content:"";position:absolute;width:320px;height:320px;border-radius:50%;background:rgba(255,255,255,.14);top:-120px;right:-80px}
.cta-band::after{content:"";position:absolute;width:260px;height:260px;border-radius:50%;background:rgba(255,255,255,.1);bottom:-110px;left:-60px}
.cta-band h2{color:#fff;font-size:28px;margin-bottom:12px}
.cta-band p{opacity:.92;margin-bottom:26px}
.cta-band .btn{position:relative;z-index:1}

/* ---------- 面包屑 / 页头 ---------- */
.page-hero{position:relative;background:var(--bg-navy);color:#cbd5e1;overflow:hidden}
.page-hero::before{content:"";position:absolute;inset:0;background:radial-gradient(500px 300px at 80% -20%,rgba(37,99,235,.4),transparent 60%),linear-gradient(180deg,#0b1220,#0e1a33)}
.page-hero .container{position:relative;padding:54px 24px;text-align:center}
.page-hero h1{color:#fff;font-size:34px;margin-bottom:12px}
.page-hero p{max-width:620px;margin:0 auto;color:#cbd5e1;font-size:16px}
.crumbs{display:flex;justify-content:center;gap:8px;align-items:center;margin-top:16px;font-size:13px;color:#94a3b8}
.crumbs a{color:#94a3b8}
.crumbs a:hover{color:#fff}
.crumbs span{opacity:.5}

/* ---------- 服务详情正文 ---------- */
.content-section{padding:64px 0}
.content-grid{display:grid;grid-template-columns:1fr 300px;gap:44px;align-items:start}
.article h2{font-size:24px;margin:0 0 16px;padding-left:14px;border-left:4px solid var(--brand)}
.article h3{font-size:18px;margin:22px 0 10px}
.article p{margin-bottom:14px;color:var(--ink-2)}
.article ul{list-style:none;margin-bottom:14px}
.article ul li{position:relative;padding-left:24px;margin-bottom:10px}
.article ul li::before{content:"";position:absolute;left:0;top:9px;width:14px;height:14px;border-radius:50%;background:var(--grad-soft);border:3px solid var(--brand)}
.article .lead{font-size:18px;color:var(--ink);margin-bottom:24px}
.panel{background:var(--bg-soft);border:1px solid var(--line);border-radius:var(--radius);padding:26px}
.panel h4{font-size:16px;margin-bottom:14px}
.panel ul li{display:flex;justify-content:space-between;gap:8px;padding:9px 0;border-bottom:1px dashed var(--line);font-size:14px}
.panel ul li:last-child{border-bottom:0}
.panel ul li span{color:var(--muted)}
.sidebar{position:sticky;top:90px;display:flex;flex-direction:column;gap:18px}
.side-cta{background:var(--grad);border-radius:var(--radius);padding:24px;color:#fff;text-align:center}
.side-cta img{width:120px;height:120px;margin:0 auto 12px;border-radius:10px;border:2px solid rgba(255,255,255,.5)}
.side-cta h4{color:#fff;margin-bottom:6px}
.side-cta p{font-size:13px;opacity:.9;margin-bottom:14px}

/* ---------- 关于 / 联系 ---------- */
.value-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.contact-grid{display:grid;grid-template-columns:1.4fr 1fr;gap:36px;align-items:start}
.contact-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:30px}
.contact-row{display:flex;gap:16px;align-items:flex-start;padding:16px 0;border-bottom:1px solid var(--line)}
.contact-row:last-child{border-bottom:0}
.contact-row .ic{flex:none;width:46px;height:46px;border-radius:12px;background:var(--grad-soft);display:flex;align-items:center;justify-content:center;color:var(--brand)}
.contact-row .ic svg{width:22px;height:22px}
.contact-row h4{font-size:15px;margin-bottom:2px}
.contact-row p{font-size:14px;color:var(--muted)}
.qr-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:30px;text-align:center}
.qr-card img{width:180px;height:180px;margin:0 auto 14px;border-radius:12px;border:1px solid var(--line)}

/* ---------- 页脚 ---------- */
.site-footer{background:var(--bg-navy);color:#94a3b8}
.footer-top{display:grid;grid-template-columns:1.6fr 1fr 1fr 1.2fr;gap:40px;padding:64px 0 44px}
.footer-col h4{color:#fff;font-size:16px;margin-bottom:18px}
.footer-col ul li{margin-bottom:10px}
.footer-col ul a{color:#94a3b8;font-size:14px}
.footer-col ul a:hover{color:#fff}
.footer-col p{font-size:14px;margin-bottom:10px}
.footer-brand .brand{margin-bottom:16px}
.footer-brand .brand-text strong{color:#fff}
.footer-brand .brand-text small{color:#64748b}
.footer-qr{width:110px;height:110px;border-radius:10px;border:1px solid #1e293b;margin-top:8px}
.footer-bottom{border-top:1px solid #1e293b;padding:20px 0;font-size:13px;color:#64748b;text-align:center}
.footer-bottom a{color:#94a3b8}

/* ---------- 滚动显现 ---------- */
.reveal{opacity:0;transform:translateY(26px);transition:opacity .6s ease,transform .6s ease}
.reveal.visible{opacity:1;transform:none}

/* ---------- 响应式 ---------- */
@media(max-width:1024px){
  .cards{grid-template-columns:repeat(2,1fr)}
  .steps{grid-template-columns:repeat(2,1fr)}
  .case-grid{grid-template-columns:repeat(2,1fr)}
  .content-grid{grid-template-columns:1fr}
  .sidebar{position:static}
  .footer-top{grid-template-columns:1fr 1fr}
}
@media(max-width:768px){
  .hero h1{font-size:32px}
  .hero-inner{padding-top:64px}
  .hero-stats{grid-template-columns:repeat(2,1fr);border-radius:16px 16px 0 0}
  .hero-stat{padding:20px 12px}
  .split{grid-template-columns:1fr}
  .section{padding:60px 0}
  .sec-head h2{font-size:26px}
  .cards{grid-template-columns:1fr}
  .case-grid{grid-template-columns:1fr}
  .steps{grid-template-columns:1fr}
  .value-cards{grid-template-columns:1fr}
  .contact-grid{grid-template-columns:1fr}
  .footer-top{grid-template-columns:1fr;gap:28px}
  .main-nav{position:fixed;top:70px;left:0;right:0;bottom:0;background:#fff;padding:20px;transform:translateX(100%);transition:.3s;overflow:auto}
  .main-nav.open{transform:translateX(0)}
  .main-nav>ul{flex-direction:column;align-items:stretch;gap:2px}
  .main-nav>ul>li>a{justify-content:space-between;padding:14px;border-bottom:1px solid var(--line)}
  .drop{position:static;opacity:1;visibility:visible;transform:none;box-shadow:none;border:0;padding:0 0 0 14px;display:none}
  .has-drop.open .drop{display:block}
  .nav-toggle{display:flex}
  .header-cta .btn{display:none}
}
@media(max-width:480px){
  .hero h1{font-size:26px}
  .hero-sub{font-size:15px}
  .hero-cta{flex-direction:column}
  .btn{width:100%}
  .hero-tags{display:none}
}

/* ---------- 手机 H5 自适应增强 ---------- */
@media(max-width:768px){
  .page-hero .container{padding:40px 20px}
  .page-hero h1{font-size:26px}
  .page-hero p{font-size:15px}
  .content-section{padding:44px 0}
  .content-grid{gap:28px}
  .article h2{font-size:20px}
  .article .lead{font-size:16px}
  .cta-band{padding:40px 22px}
  .cta-band h2{font-size:22px}
  .media-box{padding:26px}
  .panel,.side-cta{padding:22px}
}
@media(max-width:480px){
  .page-hero h1{font-size:22px}
  .crumbs{font-size:12px;flex-wrap:wrap}
  .section{padding:48px 0}
  .sec-head h2{font-size:22px}
  .card{padding:22px}
}