:root{--blue:#1F3864;--blue2:#2B4D8A;--yellow:#FFD700;--ink:#1c2532;--gray:#4A5568;--bg:#F8FAFC;--line:#e3e8f0}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:"PingFang SC","Microsoft YaHei","Hiragino Sans GB",sans-serif;color:var(--ink);line-height:1.75;background:#fff}
a{color:inherit;text-decoration:none}
.wrap{max-width:1120px;margin:0 auto;padding:0 20px}
/* 顶栏 */
header{position:sticky;top:0;z-index:50;background:var(--blue);box-shadow:0 2px 10px rgba(0,0,0,.15)}
.nav{display:flex;align-items:center;justify-content:space-between;height:62px}
.logo{display:flex;align-items:center;gap:12px;color:#fff;font-weight:700;font-size:16px;letter-spacing:1px}
.logo img{height:44px;display:block;border-radius:6px}
.logo .co{white-space:nowrap}
@media(max-width:560px){.logo .co{display:none}}
.menu{display:flex;gap:26px;list-style:none}
.menu a{color:#dbe4f3;font-size:15px}
.menu a:hover{color:var(--yellow)}
.nav-tel{color:#fff;font-weight:700;font-size:16px;white-space:nowrap}
.nav-tel span{color:var(--yellow)}
.burger{display:none;color:#fff;font-size:24px;background:none;border:none;cursor:pointer}
@media(max-width:900px){
  .menu{position:absolute;top:62px;left:0;right:0;background:var(--blue);flex-direction:column;gap:0;display:none;padding:8px 0}
  .menu.open{display:flex}
  .menu li{border-top:1px solid rgba(255,255,255,.1)}
  .menu a{display:block;padding:12px 24px}
  .nav-tel{display:none}
  .burger{display:block}
}
/* 首屏 */
.hero{background:linear-gradient(135deg,var(--blue) 0%,var(--blue2) 100%);color:#fff;padding:74px 0 60px}
.hero .tag{display:inline-block;background:rgba(245,179,1,.15);border:1px solid var(--yellow);color:var(--yellow);padding:4px 14px;border-radius:20px;font-size:14px;margin-bottom:18px}
.hero h1{font-size:40px;line-height:1.3;margin-bottom:14px}
.hero h1 em{color:var(--yellow);font-style:normal}
.hero p.sub{font-size:17px;color:#c9d6ec;max-width:760px;margin-bottom:26px}
.hero-cta{display:flex;gap:16px;flex-wrap:wrap;margin-bottom:40px}
.btn{display:inline-block;padding:13px 30px;border-radius:6px;font-weight:700;font-size:17px}
.btn-y{background:var(--yellow);color:var(--blue)}
.btn-o{border:2px solid rgba(255,255,255,.55);color:#fff}
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
.stat{background:rgba(255,255,255,.07);border:1px solid rgba(255,255,255,.16);border-radius:8px;padding:18px 12px;text-align:center}
.stat b{display:block;font-size:26px;color:var(--yellow)}
.stat span{font-size:14px;color:#c9d6ec}
@media(max-width:760px){.hero h1{font-size:28px}.stats{grid-template-columns:repeat(2,1fr)}}
/* 区块通用 */
section{padding:64px 0}
.sec-head{text-align:center;margin-bottom:40px}
.sec-head .en{color:var(--yellow);font-weight:700;letter-spacing:3px;font-size:13px}
.sec-head h2{font-size:30px;color:var(--blue);margin-top:6px}
.sec-head p{color:var(--gray);margin-top:8px}
.gray{background:var(--bg)}
/* 关于 */
.about-grid{display:grid;grid-template-columns:1.2fr .8fr;gap:40px;align-items:start}
.about-txt p{margin-bottom:14px;color:#333}
.role-card{background:#fff;border:1px solid var(--line);border-radius:10px;padding:26px}
.role-card h3{color:var(--blue);font-size:18px;margin-bottom:14px;padding-bottom:10px;border-bottom:2px solid var(--yellow)}
.role-card ul{list-style:none}
.role-card li{padding:8px 0 8px 24px;position:relative;color:#333;font-size:15px}
.role-card li::before{content:"";position:absolute;left:2px;top:16px;width:8px;height:8px;border-radius:50%;background:var(--yellow)}
.role-card.no li::before{background:#c2cad6}
@media(max-width:860px){.about-grid{grid-template-columns:1fr}}
/* 服务卡片 */
.flow-box{background:linear-gradient(135deg,var(--blue),var(--blue2));color:#fff;border-radius:12px;padding:26px 30px;margin-bottom:26px}
.flow-box h3{font-size:17px;margin-bottom:14px}
.flow-box h3 span{color:var(--yellow)}
.flow-steps{display:flex;align-items:stretch;gap:10px;flex-wrap:wrap}
.fstep{flex:1;min-width:150px;background:rgba(255,255,255,.09);border:1px solid rgba(255,255,255,.26);border-radius:8px;padding:12px 16px}
.fstep b{display:block;font-size:15.5px}
.fstep span{font-size:12.5px;color:#c9d6ec}
.farrow{align-self:center;color:var(--yellow);font-weight:800;font-size:18px}
.badge{display:inline-block;background:var(--blue);color:#fff;font-size:12px;padding:2px 10px;border-radius:12px;margin-bottom:8px}
.hook{color:var(--gray);font-size:13.5px;font-style:italic;margin-bottom:8px}
.grp{margin:30px 0 16px;font-size:14px;color:var(--gray);font-weight:700;letter-spacing:2px}
.grp b{color:var(--blue);font-size:16px;letter-spacing:0}
.fit{color:var(--gray);font-size:14px;margin-bottom:8px}
.fit b{color:var(--blue2)}
.support-band{background:#edf1f8;border:1px solid var(--line);border-radius:12px;padding:26px 28px;display:grid;grid-template-columns:1fr 1fr;gap:26px;margin-top:8px}
.support-band h4{color:var(--blue);font-size:16.5px;margin-bottom:6px}
.support-band p{font-size:14px;color:#3a4454}
.support-band .ft{margin-top:10px;font-size:13px;color:var(--blue2);font-weight:600}
.result-band{background:linear-gradient(135deg,var(--blue),var(--blue2));color:#fff;border-radius:12px;padding:28px 30px;margin-top:26px}
.result-band h3{font-size:17.5px;margin-bottom:16px}
.result-band h3 span{color:var(--yellow)}
.res-cols{display:grid;grid-template-columns:1fr 1fr;gap:24px}
.res-cols h4{font-size:13.5px;color:#c9d6ec;margin-bottom:10px;letter-spacing:1px}
.res-cols .chips span{background:rgba(255,255,255,.1);border-color:rgba(255,255,255,.25);color:#fff}
.result-band .note{margin-top:16px;font-size:13px;color:#c9d6ec}
@media(max-width:860px){.support-band,.res-cols{grid-template-columns:1fr}}
.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.card{background:#fff;border:1px solid var(--line);border-radius:10px;padding:28px 24px;transition:.2s}
.card:hover{transform:translateY(-4px);box-shadow:0 10px 24px rgba(11,42,91,.1);border-color:var(--yellow)}
.card .num{color:var(--yellow);font-weight:800;font-size:15px}
.card h3{color:var(--blue);font-size:19px;margin:6px 0 10px}
.card p{color:var(--gray);font-size:14.5px}
.card .ft{margin-top:12px;font-size:13.5px;color:var(--blue2);font-weight:600}
@media(max-width:860px){.cards{grid-template-columns:1fr}}
/* 仓库 */
.wh-grid{display:grid;grid-template-columns:1fr 1fr;gap:28px}
.wh{background:#fff;border:1px solid var(--line);border-radius:10px;overflow:hidden}
.wh img{width:100%;height:260px;object-fit:cover;display:block}
.wh-body{padding:24px}
.wh-body h3{color:var(--blue);font-size:19px;margin-bottom:10px}
.specs{list-style:none;margin-top:6px}
.specs li{font-size:14.5px;color:#333;padding:5px 0;border-bottom:1px dashed var(--line)}
.specs li b{color:var(--blue)}
.free-note{margin-top:26px;background:#fff8e6;border:1px solid var(--yellow);border-radius:8px;padding:16px 20px;font-size:14.5px;color:#6b5200}
@media(max-width:860px){.wh-grid{grid-template-columns:1fr}}
/* 网络 */
.trunk-box{background:linear-gradient(135deg,var(--blue),var(--blue2));color:#fff;border-radius:12px;padding:28px 30px;margin-bottom:28px}
.trunk-box h3{font-size:18px;margin-bottom:4px}
.trunk-box h3 span{color:var(--yellow)}
.trunk-routes{display:flex;gap:14px;flex-wrap:wrap;margin:16px 0}
.route{background:rgba(255,255,255,.09);border:1px solid rgba(255,255,255,.28);border-radius:8px;padding:9px 18px;font-weight:700;font-size:15.5px}
.route i{color:var(--yellow);font-style:normal;margin:0 9px}
.trunk-box p{font-size:14px;color:#c9d6ec}
.net-grid{display:grid;grid-template-columns:1fr 1fr;gap:28px}
.net-box{background:#fff;border:1px solid var(--line);border-radius:10px;padding:26px}
.net-box h3{color:var(--blue);font-size:17px;margin-bottom:12px}
.chips{display:flex;flex-wrap:wrap;gap:9px}
.chips span{background:var(--bg);border:1px solid var(--line);padding:5px 14px;border-radius:16px;font-size:14px;color:#333}
.chips span.hot{background:var(--blue);color:#fff;border-color:var(--blue)}
@media(max-width:860px){.net-grid{grid-template-columns:1fr}}
/* 项目 */
.proj{display:grid;grid-template-columns:1fr 1fr;gap:22px}
.pj{background:#fff;border-left:4px solid var(--yellow);border-radius:8px;padding:24px;box-shadow:0 2px 8px rgba(0,0,0,.04)}
.pj h3{color:var(--blue);font-size:17px;margin-bottom:8px}
.pj p{font-size:14.5px;color:var(--gray)}
.pj p b{color:#333}
@media(max-width:860px){.proj{grid-template-columns:1fr}}
/* 资质 */
.cred-band{background:var(--blue);color:#fff;border-radius:12px;padding:34px 30px;display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-bottom:34px}
.cred-band div{text-align:center}
.cred-band b{display:block;font-size:25px;color:var(--yellow)}
.cred-band span{font-size:13.5px;color:#c9d6ec}
.cred-list{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.cred{display:flex;gap:14px;background:#fff;border:1px solid var(--line);border-radius:8px;padding:18px}
.cred .ic{flex:none;width:42px;height:42px;border-radius:8px;background:var(--blue);color:var(--yellow);display:flex;align-items:center;justify-content:center;font-weight:800;font-size:15px}
.cred h4{color:var(--blue);font-size:15.5px}
.cred p{font-size:13.5px;color:var(--gray)}
@media(max-width:860px){.cred-band{grid-template-columns:repeat(2,1fr)}.cred-list{grid-template-columns:1fr}}
/* FAQ */
.faq{max-width:860px;margin:0 auto}
details{background:#fff;border:1px solid var(--line);border-radius:8px;margin-bottom:12px;padding:0 22px}
summary{cursor:pointer;padding:17px 0;font-weight:700;color:var(--blue);font-size:16px;list-style:none}
summary::before{content:"Q";color:var(--yellow);margin-right:10px;font-weight:800}
details p{padding:0 0 18px 26px;color:#444;font-size:15px}
/* 联系 */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:28px}
.c-card{background:#fff;border:1px solid var(--line);border-radius:10px;padding:28px}
.c-card h3{color:var(--blue);margin-bottom:16px;font-size:18px}
.c-line{display:flex;gap:10px;padding:9px 0;border-bottom:1px dashed var(--line);font-size:15px}
.c-line .k{flex:none;width:76px;color:var(--gray)}
.c-line .v{color:#222;font-weight:600}
.c-line .v.tel{font-size:19px;color:var(--blue)}
@media(max-width:860px){.contact-grid{grid-template-columns:1fr}}
footer{background:#16294A;color:#93a5c4;padding:30px 0;font-size:13.5px;text-align:center}
footer p{margin:4px 0}

/* 子页：面包屑与页头 */
.crumb{font-size:13px;color:var(--gray);padding:14px 0 0}
.crumb a{color:var(--blue2)}
.page-head{background:linear-gradient(135deg,var(--blue),var(--blue2));color:#fff;padding:42px 0}
.page-head h1{font-size:32px}
.page-head h1 em{color:var(--yellow);font-style:normal}
.page-head p{color:#c9d6ec;margin-top:10px;max-width:840px}
.menu a.cur{color:var(--yellow);font-weight:700}
/* 服务详情块 */
.svc{background:#fff;border:1px solid var(--line);border-left:4px solid var(--yellow);border-radius:10px;padding:28px 32px;margin-bottom:22px;display:grid;grid-template-columns:1.5fr 1fr;gap:30px}
.svc .num{color:var(--yellow);font-weight:800;font-size:15px}
.svc h2{color:var(--blue);font-size:22px;margin:4px 0 10px}
.svc ul.acts{list-style:none;margin-top:10px}
.svc ul.acts li{padding:5px 0 5px 22px;position:relative;font-size:14.5px;color:#333}
.svc ul.acts li::before{content:"";position:absolute;left:2px;top:14px;width:7px;height:7px;border-radius:50%;background:var(--yellow)}
.svc-side{background:var(--bg);border-radius:8px;padding:20px;align-self:start}
.svc-side h4{color:var(--blue);font-size:14.5px;margin-bottom:10px}
.svc-side .chips span{background:#fff}
.btn-s{display:inline-block;background:var(--yellow);color:var(--blue);font-weight:700;padding:9px 22px;border-radius:6px;font-size:14.5px;margin-top:14px}
.boundary{margin-top:10px;font-size:13px;color:#8a6d00;background:#fff8e6;border:1px dashed var(--yellow);border-radius:6px;padding:10px 14px}
/* 询价清单 */
.quote{display:grid;grid-template-columns:1fr 1fr;gap:28px;background:#fff;border:1px solid var(--line);border-radius:12px;padding:30px}
.quote h3{color:var(--blue);margin-bottom:12px;font-size:17px}
.quote ul{list-style:none}
.quote li{padding:8px 0 8px 26px;position:relative;font-size:14.5px;border-bottom:1px dashed var(--line)}
.quote li::before{content:"✓";position:absolute;left:2px;color:var(--yellow);font-weight:800}
.more{display:inline-block;margin-top:10px;font-size:13px;color:var(--blue2);font-weight:700}
.more:hover{color:var(--yellow)}
@media(max-width:860px){.svc{grid-template-columns:1fr}.quote{grid-template-columns:1fr}.page-head h1{font-size:24px}}

/* 三种执行方式 */
.modes{background:linear-gradient(135deg,var(--blue),var(--blue2));color:#fff;border-radius:12px;padding:26px 30px;margin-bottom:26px}
.modes h3{font-size:17px;margin-bottom:14px}
.modes h3 span{color:var(--yellow)}
.mode-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
.mode{background:rgba(255,255,255,.09);border:1px solid rgba(255,255,255,.26);border-radius:8px;padding:16px 18px}
.mode b{display:block;font-size:15.5px;margin-bottom:6px;color:var(--yellow)}
.mode p{font-size:13.5px;color:#dbe4f3}
.steps4{display:grid;grid-template-columns:1fr 1fr;gap:0 26px;list-style:none;margin-top:6px}
.steps4 li{padding:6px 0 6px 24px;position:relative;font-size:14px;color:#dbe4f3}
.steps4 li::before{content:"";position:absolute;left:4px;top:15px;width:7px;height:7px;border-radius:50%;background:var(--yellow)}
@media(max-width:860px){.mode-grid,.steps4{grid-template-columns:1fr}}

/* 导航：下拉菜单与CTA按钮 */
.menu li.has-sub{position:relative}
.menu .caret{font-size:10px;margin-left:4px}
.menu .sub{display:none;position:absolute;top:100%;left:-10px;background:#fff;min-width:210px;border-radius:8px;box-shadow:0 12px 30px rgba(11,42,91,.18);padding:8px 0;list-style:none;z-index:60;border:1px solid var(--line)}
.menu li.has-sub:hover .sub{display:block}
.menu .sub li{border:none}
.menu .sub a{display:block;padding:10px 18px;color:var(--ink);font-size:14px}
.menu .sub a:hover{background:var(--bg);color:var(--blue)}
.nav-cta{background:var(--yellow);color:var(--blue);font-weight:700;padding:9px 20px;border-radius:6px;font-size:15px;white-space:nowrap}
.nav-cta:hover{background:#ffd81f;color:var(--blue)}
.mob-cta{display:none}
@media(max-width:900px){
  .nav-cta{display:none}
  .mob-cta{display:block}
  .mob-cta a{color:var(--yellow);font-weight:700}
  .menu .sub{display:block;position:static;background:transparent;box-shadow:none;border:none;padding:0}
  .menu .sub a{color:#b9c6de;padding:9px 0 9px 24px;font-size:13.5px}
  .menu .sub a:hover{background:none;color:var(--yellow)}
  .menu li.has-sub > a{border-bottom:1px solid rgba(255,255,255,.1)}
}

/* 移动端底部悬浮转化条 */
.mob-bar{display:none}
.toast-wx{position:fixed;bottom:64px;left:50%;transform:translateX(-50%);background:rgba(20,33,61,.92);color:#fff;padding:10px 18px;border-radius:20px;font-size:13.5px;z-index:100;display:none;white-space:nowrap}
@media(max-width:860px){
  body{padding-bottom:52px}
  .mob-bar{display:flex;position:fixed;left:0;right:0;bottom:0;z-index:99;box-shadow:0 -2px 12px rgba(0,0,0,.14)}
  .mob-bar a,.mob-bar button{flex:1;text-align:center;padding:13px 0;font-size:15.5px;font-weight:700;border:0;cursor:pointer;text-decoration:none;font-family:inherit}
  .mob-bar .tel{background:var(--blue);color:#fff}
  .mob-bar .wx{background:var(--yellow);color:var(--blue)}
}