/* ============ 基础与变量 ============ */
:root{
  --c-main:#1e5eff;
  --c-main-dark:#0f3fbf;
  --c-accent:#ff8a3d;
  --c-text:#2b3144;
  --c-text-soft:#5d6478;
  --c-bg:#f6f8fc;
  --c-white:#ffffff;
  --c-border:#e6e9f2;
  --shadow:0 8px 24px rgba(30,94,255,.08);
  --shadow-hover:0 16px 40px rgba(30,94,255,.14);
  --radius:14px;
  --maxw:1200px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:"PingFang SC","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;
  color:var(--c-text);background:#fff;line-height:1.7;font-size:16px;
}
a{text-decoration:none;color:inherit;transition:.25s}
img{max-width:100%;display:block}
ul{list-style:none}
.container{max-width:var(--maxw);margin:0 auto;padding:0 24px}
.section{padding:64px 0}
.section-title{
  text-align:center;margin-bottom:48px;
}
.section-title h2{
  font-size:32px;color:var(--c-text);position:relative;display:inline-block;padding-bottom:14px;
}
.section-title h2::after{
  content:"";position:absolute;left:50%;bottom:0;transform:translateX(-50%);
  width:54px;height:4px;border-radius:2px;background:var(--c-main);
}
.section-title p{color:var(--c-text-soft);margin-top:12px;font-size:15px}
@media(max-width:768px){
  .section{padding:48px 0}
  .section-title h2{font-size:24px}
}

/* ============ 顶部工具栏 ============ */
.topbar{
  background:#0c1f4d;color:#cfd8f5;font-size:14px;
  border-bottom:1px solid rgba(255,255,255,.06);
}
.topbar .container{display:flex;justify-content:space-between;align-items:center;height:42px}
.topbar a{color:#cfd8f5}
.topbar .phone{color:#ffd479;font-weight:600}
.topbar .phone i{margin-right:6px}
.topbar .region{opacity:.85}

/* ============ 导航 ============ */
.header{position:sticky;top:0;z-index:999;background:rgba(255,255,255,.96);
  box-shadow:0 2px 12px rgba(0,0,0,.04);backdrop-filter:blur(8px)}
.header .container{display:flex;align-items:center;justify-content:space-between;height:72px;flex-wrap:nowrap;gap:12px}
.brand{display:flex;align-items:center;flex-shrink:0}
.brand .logo-img{height:46px;width:auto;display:block;border-radius:6px;object-fit:contain}
@media(max-width:560px){.brand .logo-img{height:38px}}
.city-switcher{
  position:relative;display:inline-flex;align-items:center;margin-left:8px;flex-shrink:0;
}
.city-switcher .city-trigger{
  display:inline-flex;align-items:center;gap:4px;cursor:pointer;border:none;
  padding:5px 12px;border-radius:18px;font-size:13px;font-weight:600;
  color:var(--c-main);background:linear-gradient(135deg,#eef3ff,#dbe6ff);
  white-space:nowrap;font-family:inherit;
}
.city-switcher .city-trigger::before{content:"●";color:var(--c-accent);font-size:11px}
.city-switcher .city-arrow{font-size:10px;opacity:.7}
.city-switcher .city-dropdown{
  position:absolute;top:calc(100% + 6px);left:0;min-width:120px;
  background:#fff;border-radius:10px;box-shadow:0 8px 24px rgba(0,0,0,.12);
  padding:6px;display:none;z-index:1000;max-height:260px;overflow-y:auto;
}
.city-switcher .city-dropdown.show{display:block}
.city-switcher .city-item{
  display:block;padding:8px 12px;border-radius:6px;font-size:13px;
  color:var(--c-text);text-decoration:none;white-space:nowrap;
}
.city-switcher .city-item:hover{background:#eef3ff;color:var(--c-main)}
.city-switcher .city-item.active{background:var(--c-main);color:#fff}
@media(max-width:960px){.city-switcher{display:none}}
.nav{display:flex;gap:4px;flex-wrap:nowrap;flex-shrink:1;min-width:0}
.nav a{
  padding:8px 12px;border-radius:8px;font-size:14px;color:var(--c-text);font-weight:500;white-space:nowrap;
}
.nav a:hover,.nav a.active{background:#eef3ff;color:var(--c-main)}
.header .cta{display:flex;align-items:center;gap:10px;flex-shrink:0}
.header .cta-phone{font-weight:700;color:var(--c-main);font-size:15px;white-space:nowrap}
.header .cta .btn{padding:9px 20px;font-size:14px}
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:11px 26px;border-radius:30px;font-size:15px;font-weight:600;cursor:pointer;border:none;
  transition:.25s;
}
.btn-primary{background:var(--c-main);color:#fff}
.btn-primary:hover{background:var(--c-main-dark);transform:translateY(-1px);box-shadow:0 10px 20px rgba(30,94,255,.3)}
.btn-accent{background:var(--c-accent);color:#fff}
.btn-accent:hover{background:#f4721a;transform:translateY(-1px)}
.btn-outline{background:transparent;color:var(--c-main);border:1.5px solid var(--c-main)}
.btn-outline:hover{background:var(--c-main);color:#fff}
.menu-toggle{display:none;font-size:24px;background:none;border:none;cursor:pointer;color:var(--c-main)}
@media(max-width:1100px){
  .header .cta-phone{display:none}
  .region-tag{display:none}
}
@media(max-width:960px){
  .nav{display:none}
  .menu-toggle{display:block}
  .header .cta-phone{display:none}
  .nav.open{
    display:flex;flex-direction:column;position:absolute;top:72px;left:0;right:0;
    background:#fff;padding:14px 24px;box-shadow:0 8px 20px rgba(0,0,0,.1);gap:4px
  }
  .nav.open a{padding:10px 14px}
}

/* ============ Hero ============ */
.hero{
  position:relative;color:#fff;
  background:linear-gradient(135deg,#0a1f5c 0%,#1e5eff 60%,#3a7bff 100%);
  overflow:hidden;
}
.hero::before{
  content:"";position:absolute;inset:0;opacity:.15;
  background-image:
    radial-gradient(circle at 20% 30%,#fff 0,transparent 40%),
    radial-gradient(circle at 80% 70%,#fff 0,transparent 40%);
}
.hero::after{
  content:"";position:absolute;right:-100px;top:-100px;width:380px;height:380px;border-radius:50%;
  background:radial-gradient(circle,rgba(255,138,61,.45),transparent 70%);
}
.hero .container{position:relative;z-index:2;padding-top:54px;padding-bottom:54px}
.hero-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:40px;align-items:center}
.hero h1{font-size:38px;line-height:1.3;margin-bottom:14px;font-weight:800}
.hero h1 em{color:#ffd479;font-style:normal}
.hero .sub{font-size:18px;opacity:.95;margin-bottom:18px}
.hero .meta{font-size:14px;opacity:.88;margin-bottom:24px}
.hero .meta span{margin-right:14px}
.hero .actions{display:flex;gap:14px;flex-wrap:wrap;margin-bottom:18px}
.hero .stats{display:flex;gap:28px;flex-wrap:wrap;border-top:1px solid rgba(255,255,255,.2);padding-top:18px}
.hero .stats .num{font-size:26px;font-weight:800;color:#ffd479}
.hero .stats .label{font-size:13px;opacity:.8}

/* hero 卡片 */
.hero-card{
  background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.25);border-radius:18px;
  padding:24px;backdrop-filter:blur(8px);
}
.hero-card .title{font-size:16px;font-weight:700;margin-bottom:14px;color:#fff}
.hero-card .row{display:flex;justify-content:space-between;padding:9px 0;border-bottom:1px dashed rgba(255,255,255,.2);font-size:14px}
.hero-card .row:last-child{border-bottom:none}
.hero-card .row .k{opacity:.85}
.hero-card .row .v{font-weight:600}
.hero-card .btn{margin-top:16px;width:100%}
@media(max-width:960px){
  .hero-grid{grid-template-columns:1fr}
  .hero h1{font-size:26px}
  .hero .sub{font-size:15px}
}

/* ============ 优势 ============ */
.advantage-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.advantage-card{
  background:#fff;border:1px solid var(--c-border);border-radius:var(--radius);
  padding:30px 24px;transition:.3s;
}
.advantage-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-hover);border-color:transparent}
.advantage-card .icon{
  width:56px;height:56px;border-radius:14px;display:flex;align-items:center;justify-content:center;
  font-size:26px;background:linear-gradient(135deg,#eef3ff,#dbe6ff);color:var(--c-main);margin-bottom:16px;
}
.advantage-card h3{font-size:18px;margin-bottom:10px;color:var(--c-text)}
.advantage-card p{font-size:14px;color:var(--c-text-soft);line-height:1.75}
@media(max-width:960px){.advantage-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:560px){.advantage-grid{grid-template-columns:1fr}}

/* ============ 合作安心 ============ */
.assurance{background:var(--c-bg)}
.assurance-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.assurance-card{
  background:#fff;border-radius:var(--radius);padding:26px 20px;text-align:center;
  border-top:3px solid transparent;transition:.3s;
}
.assurance-card:hover{transform:translateY(-4px);box-shadow:var(--shadow);border-top-color:var(--c-main)}
.assurance-card .icon{
  width:54px;height:54px;border-radius:50%;margin:0 auto 14px;
  background:#eef3ff;color:var(--c-main);display:flex;align-items:center;justify-content:center;font-size:22px;
}
.assurance-card h3{font-size:17px;margin-bottom:8px}
.assurance-card p{font-size:13px;color:var(--c-text-soft)}
@media(max-width:960px){.assurance-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:560px){.assurance-grid{grid-template-columns:1fr}}

/* ============ 公司概况 ============ */
.profile-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.profile-card{
  text-align:center;padding:30px 18px;background:#fff;border-radius:var(--radius);
  border:1px solid var(--c-border);transition:.3s;
}
.profile-card:hover{box-shadow:var(--shadow);transform:translateY(-4px)}
.profile-card .num{
  font-size:38px;font-weight:800;color:var(--c-main);margin-bottom:6px;
}
.profile-card .tag{font-size:14px;color:var(--c-accent);font-weight:600;margin-bottom:10px}
.profile-card .desc{font-size:13px;color:var(--c-text-soft)}
@media(max-width:960px){.profile-grid{grid-template-columns:repeat(2,1fr)}}

/* ============ 产品中心 ============ */
.product{background:var(--c-bg)}
.product-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.product-card{
  background:#fff;border-radius:var(--radius);overflow:hidden;transition:.3s;
  border:1px solid var(--c-border);
}
.product-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-hover);border-color:transparent}
.product-card .thumb{
  height:170px;display:flex;align-items:center;justify-content:center;
  background:linear-gradient(135deg,#1e5eff,#3a7bff);color:#fff;font-size:42px;
}
.product-card:nth-child(2) .thumb{background:linear-gradient(135deg,#ff8a3d,#ffb877)}
.product-card:nth-child(3) .thumb{background:linear-gradient(135deg,#22c590,#5fd9ad)}
.product-card:nth-child(4) .thumb{background:linear-gradient(135deg,#9b5cff,#c08aff)}
.product-card .body{padding:20px 18px}
.product-card h3{font-size:17px;margin-bottom:8px}
.product-card .desc{font-size:13px;color:var(--c-text-soft);margin-bottom:12px}
.product-card .more{color:var(--c-main);font-size:13px;font-weight:600}
.section-foot{text-align:center;margin-top:36px}
@media(max-width:960px){.product-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:560px){.product-grid{grid-template-columns:1fr}}

/* ============ 行业趋势 ============ */
.trend{background:#fff}
.trend-wrap{
  background:linear-gradient(135deg,#f6f8fc,#eef3ff);border-radius:var(--radius);padding:36px;
  border-left:5px solid var(--c-main);
}
.trend-wrap h3{font-size:20px;margin-bottom:14px;color:var(--c-text)}
.trend-wrap p{font-size:15px;color:var(--c-text-soft);line-height:1.95}

/* ============ 关于我们 ============ */
.about-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:40px;align-items:start}
.about-meta{
  background:var(--c-bg);border-radius:var(--radius);padding:24px;margin-bottom:18px;
}
.about-meta h4{font-size:15px;margin-bottom:12px;color:var(--c-text)}
.about-meta p{font-size:14px;color:var(--c-text-soft);margin-bottom:8px}
.about-meta strong{color:var(--c-text)}
.about-text p{font-size:14.5px;color:var(--c-text-soft);margin-bottom:14px;line-height:1.95}
.about-text p strong{color:var(--c-text)}
.about-text .more{margin-top:18px}
@media(max-width:960px){.about-grid{grid-template-columns:1fr}}

/* ============ FAQ ============ */
.faq{background:var(--c-bg)}
.faq-list{max-width:920px;margin:0 auto}
.faq-item{
  background:#fff;border-radius:12px;margin-bottom:14px;overflow:hidden;
  border:1px solid var(--c-border);
}
.faq-q{
  padding:18px 22px;cursor:pointer;display:flex;justify-content:space-between;align-items:center;
  font-weight:600;font-size:15.5px;
}
.faq-q .icon{color:var(--c-main);font-size:20px;transition:.3s}
.faq-item.active .faq-q .icon{transform:rotate(45deg)}
.faq-a{
  max-height:0;overflow:hidden;transition:max-height .35s ease;
}
.faq-a-inner{padding:0 22px 18px;font-size:14px;color:var(--c-text-soft);line-height:1.85}

/* ============ 案例 ============ */
.case-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}
.case-card{
  background:#fff;border-radius:var(--radius);overflow:hidden;border:1px solid var(--c-border);
  transition:.3s;
}
.case-card:hover{transform:translateY(-4px);box-shadow:var(--shadow)}
.case-card .head{
  padding:18px 22px;background:linear-gradient(135deg,#1e5eff,#3a7bff);color:#fff;
  display:flex;justify-content:space-between;align-items:center;
}
.case-card:nth-child(2) .head{background:linear-gradient(135deg,#ff8a3d,#ffb877)}
.case-card:nth-child(3) .head{background:linear-gradient(135deg,#22c590,#5fd9ad)}
.case-card:nth-child(4) .head{background:linear-gradient(135deg,#9b5cff,#c08aff)}
.case-card .head h3{font-size:16px}
.case-card .head .tag{font-size:12px;background:rgba(255,255,255,.25);padding:4px 12px;border-radius:20px}
.case-card .body{padding:20px 22px}
.case-card .body p{font-size:13.5px;color:var(--c-text-soft);margin-bottom:10px;line-height:1.8}
.case-card .body .result{
  background:#f6f8fc;border-radius:8px;padding:12px 14px;font-size:13px;color:var(--c-text);
  border-left:3px solid var(--c-accent);
}
.case-card .body .result strong{color:var(--c-accent)}
@media(max-width:760px){.case-grid{grid-template-columns:1fr}}

/* ============ 合作步骤 ============ */
.steps{background:linear-gradient(135deg,#0a1f5c,#1e5eff);color:#fff}
.steps .section-title h2{color:#fff}
.steps .section-title h2::after{background:#ffd479}
.steps .section-title p{color:rgba(255,255,255,.8)}
.steps-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;position:relative}
.steps-grid::before{
  content:"";position:absolute;top:36px;left:8%;right:8%;height:2px;
  background:rgba(255,255,255,.25);
}
.step-item{text-align:center;position:relative}
.step-item .num{
  width:72px;height:72px;border-radius:50%;background:#fff;color:var(--c-main);
  display:flex;align-items:center;justify-content:center;font-size:30px;font-weight:800;
  margin:0 auto 16px;position:relative;z-index:2;box-shadow:0 6px 16px rgba(0,0,0,.15);
}
.step-item h3{font-size:18px;margin-bottom:8px}
.step-item p{font-size:13.5px;opacity:.85}
@media(max-width:960px){.steps-grid{grid-template-columns:repeat(2,1fr)}.steps-grid::before{display:none}}

/* ============ 新闻 ============ */
.news-list{max-width:920px;margin:0 auto}
.news-item{
  display:flex;justify-content:space-between;align-items:center;padding:16px 18px;
  border-bottom:1px dashed var(--c-border);transition:.25s;
}
.news-item:hover{background:#f6f8fc;padding-left:24px}
.news-item .title{font-size:15px;color:var(--c-text)}
.news-item .title:hover{color:var(--c-main)}
.news-item .date{font-size:13px;color:var(--c-text-soft);white-space:nowrap;margin-left:16px}

/* ============ 底部 CTA ============ */
.footer-cta{background:linear-gradient(135deg,#ff8a3d,#f4721a);color:#fff;text-align:center;padding:48px 0}
.footer-cta h2{font-size:28px;margin-bottom:8px}
.footer-cta p{opacity:.92;margin-bottom:18px}
.footer-cta .btn{background:#fff;color:var(--c-accent);font-size:17px;padding:13px 32px}
.footer-cta .btn:hover{background:#fff8f0;transform:translateY(-2px)}

/* ============ 底部 ============ */
.footer{background:#0c1f4d;color:#cfd8f5;padding:46px 0 18px}
.footer-top{display:grid;grid-template-columns:1.6fr 1fr 1fr;gap:36px;padding-bottom:30px;border-bottom:1px solid rgba(255,255,255,.08)}
.footer h4{color:#fff;font-size:16px;margin-bottom:14px}
.footer p,.footer a{font-size:14px;color:#cfd8f5;margin-bottom:8px;display:block}
.footer a:hover{color:#ffd479}
.footer .brand{margin-bottom:14px}
.footer .brand .logo-img{height:60px;width:auto;display:block;border-radius:6px;object-fit:contain;margin-bottom:8px}
.footer .contact-line{font-size:14px;margin-bottom:6px}
.footer-bottom{padding-top:18px;text-align:center;font-size:13px;opacity:.7}
.footer-bottom a{display:inline-block;font-size:13px;margin:0 8px}
@media(max-width:760px){.footer-top{grid-template-columns:1fr}}

/* ============ 返回顶部 ============ */
.back-top{
  position:fixed;right:24px;bottom:24px;width:46px;height:46px;border-radius:50%;
  background:var(--c-main);color:#fff;border:none;cursor:pointer;font-size:22px;
  box-shadow:0 6px 16px rgba(30,94,255,.4);opacity:0;visibility:hidden;transition:.3s;z-index:900;
}
.back-top.show{opacity:1;visibility:visible}
.back-top:hover{background:var(--c-main-dark);transform:translateY(-2px)}

/* ============ 咨询浮窗 ============ */
.float-consult{
  position:fixed;right:18px;top:50%;transform:translateY(-50%);z-index:900;
  background:#fff;border-radius:14px;box-shadow:0 8px 24px rgba(0,0,0,.12);
  padding:12px 8px;display:flex;flex-direction:column;gap:8px;
}
.float-consult a{
  width:54px;height:54px;border-radius:10px;display:flex;flex-direction:column;
  align-items:center;justify-content:center;font-size:11px;color:var(--c-text-soft);
  background:#f6f8fc;transition:.25s;
}
.float-consult a:hover{background:var(--c-main);color:#fff}
.float-consult a .ic{font-size:18px;margin-bottom:2px}
@media(max-width:760px){.float-consult{display:none}}