:root{
  --blue:#1a5fd0; --blue-d:#1249a8; --blue-l:#eaf1fd;
  --text:#1a1f26; --sub:#5c6570; --line:#e6e9ee;
  --bg:#fff; --gray:#f6f8fb; --radius:8px;
  --shadow:0 10px 30px rgba(20,60,130,.08);
}
*{box-sizing:border-box;margin:0;padding:0}
body{font-family:"PingFang SC","Microsoft YaHei",Arial,sans-serif;color:var(--text);background:var(--bg);line-height:1.7;font-size:15px}
a{color:inherit;text-decoration:none}
ul{list-style:none}
img{display:block;max-width:100%}
.wrap{max-width:1200px;margin:0 auto;padding:0 24px}

/* 顶栏 */
.topbar{background:#0f1a2b;color:#9fb0c6;font-size:12.5px}
.topbar .wrap{display:flex;justify-content:space-between;align-items:center;height:34px}
.topbar a:hover{color:#fff}

/* 头部 */
header{position:sticky;top:0;z-index:200;background:rgba(255,255,255,.96);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.header-inner{display:flex;align-items:center;height:74px;gap:36px}
.logo{display:flex;align-items:center;gap:10px;font-size:21px;font-weight:800;letter-spacing:.5px;color:var(--blue)}
.logo-mark{width:38px;height:38px;border-radius:9px;background:linear-gradient(135deg,var(--blue),#3b8bf0);color:#fff;display:flex;align-items:center;justify-content:center;font-size:19px;font-weight:800}
.logo small{display:block;font-size:10px;color:var(--sub);font-weight:500;letter-spacing:2.5px}
nav{display:flex;gap:2px;flex:1}
nav a{padding:0 13px;height:74px;display:flex;align-items:center;font-size:14.5px;color:#333b45;border-bottom:2px solid transparent;transition:.2s;white-space:nowrap}
nav a:hover{color:var(--blue)}
nav a.active{color:var(--blue);border-bottom-color:var(--blue);font-weight:600}
.head-cta{display:flex;align-items:center;gap:16px}
.head-tel{text-align:right;font-size:12px;color:var(--sub);line-height:1.3}
.head-tel b{display:block;font-size:17px;color:var(--blue);font-weight:800}

/* 按钮 */
.btn{display:inline-flex;align-items:center;gap:8px;padding:11px 26px;border-radius:8px;font-size:15px;cursor:pointer;border:1px solid transparent;transition:.2s;font-weight:500}
.btn-blue{background:var(--blue);color:#fff}
.btn-blue:hover{background:var(--blue-d);transform:translateY(-1px)}
.btn-ghost{border-color:#cfd8e3;color:var(--text);background:#fff}
.btn-ghost:hover{border-color:var(--blue);color:var(--blue)}
.btn-white{background:#fff;color:var(--blue);font-weight:600}
.btn-white:hover{background:#eaf1fd}
.btn-line{border-color:rgba(255,255,255,.65);color:#fff}
.btn-line:hover{background:rgba(255,255,255,.14)}

/* 内页横幅 */
.page-hero{background:linear-gradient(100deg,rgba(8,24,50,.94),rgba(26,95,208,.72)),url("https://images.unsplash.com/photo-1461896836934-ffe607ba8211?auto=format&fit=crop&w=1920&q=80") center/cover;color:#fff;padding:70px 0}
.page-hero .kicker{font-size:13px;letter-spacing:3px;color:#9fc3ff;font-weight:700;text-transform:uppercase;margin-bottom:10px}
.page-hero h1{font-size:38px;font-weight:800;margin-bottom:12px}
.page-hero p{opacity:.86;max-width:620px}

/* 区块 */
section{padding:78px 0}
.sec-gray{background:var(--gray)}
.sec-head{margin-bottom:48px;max-width:640px}
.sec-head.center{text-align:center;margin-left:auto;margin-right:auto}
.sec-head .kicker{font-size:13px;letter-spacing:3px;color:var(--blue);font-weight:700;text-transform:uppercase;margin-bottom:10px}
.sec-head h2{font-size:32px;font-weight:800;line-height:1.3;margin-bottom:12px}
.sec-head p{color:var(--sub);font-size:15.5px}
.sec-head.center h2::after{content:"";display:block;width:44px;height:3px;background:var(--blue);margin:16px auto 0;border-radius:2px}

/* FAQ */
.faq-item{background:#fff;border:1px solid var(--line);border-radius:10px;margin-bottom:12px;overflow:hidden;transition:.2s}
.faq-item.on{border-color:#c9d9f5;box-shadow:0 6px 18px rgba(20,60,130,.06)}
.faq-q{padding:18px 22px;font-size:15px;font-weight:600;cursor:pointer;display:flex;justify-content:space-between;align-items:center;gap:12px}
.faq-q::after{content:"+";color:var(--blue);font-size:21px;font-weight:400;transition:.2s;flex-shrink:0}
.faq-item.on .faq-q::after{transform:rotate(45deg)}
.faq-a{max-height:0;overflow:hidden;transition:max-height .3s;padding:0 22px;font-size:14px;color:var(--sub)}
.faq-item.on .faq-a{max-height:260px;padding-bottom:18px}

/* 页脚 */
footer{background:#0d1626;color:#9fb0c6;padding:56px 0 0;font-size:14px}
.foot-grid{display:grid;grid-template-columns:1.7fr 1fr 1fr 1.1fr;gap:44px;padding-bottom:40px;border-bottom:1px solid #1e2c42}
.foot-logo{display:flex;align-items:center;gap:10px;font-size:20px;font-weight:800;color:#fff;margin-bottom:16px}
.foot-logo .logo-mark{background:#fff;color:var(--blue)}
footer p{font-size:13px;line-height:1.9;color:#7f8ea3}
footer h5{color:#fff;font-size:15px;margin-bottom:18px;font-weight:700}
footer li{margin-bottom:11px;font-size:13.5px}
footer li a:hover{color:#fff}
.foot-bottom{padding:22px 0;font-size:12.5px;color:#6d7d93;display:flex;justify-content:space-between;flex-wrap:wrap;gap:8px}

@media(max-width:960px){
  .header-inner{gap:14px;height:auto;padding:12px 0;flex-wrap:wrap}
  nav{order:3;flex-basis:100%;overflow-x:auto;gap:0}
  nav a{height:44px;padding:0 11px;font-size:13.5px}
  .head-cta{display:none}
  .page-hero h1{font-size:30px}
  section{padding:52px 0}
  .foot-grid{grid-template-columns:1fr 1fr}
}