/* roulang page: index */
:root{
  --blue:#1265c5;
  --blue-dark:#0b4d9e;
  --blue-soft:#eaf4ff;
  --cyan:#0e91a9;
  --ink:#172536;
  --text:#35475b;
  --muted:#6d7d90;
  --line:#dce7f1;
  --bg:#f6f9fc;
  --white:#fff;
  --deep:#10263d;
  --warm:#df7a35;
  --success:#1b8755;
  --radius:12px;
  --radius-lg:18px;
  --shadow:0 10px 30px rgba(25,64,103,.08);
  --shadow-hover:0 16px 34px rgba(22,75,127,.14);
  --container:1220px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:132px}
body{margin:0;color:var(--text);background:var(--white);font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",Arial,sans-serif;font-size:16px;line-height:1.75}
a{color:inherit;text-decoration:none}
img{display:block;max-width:100%}
button,input,textarea{font:inherit}
button{cursor:pointer}
button:focus-visible,a:focus-visible,input:focus-visible,textarea:focus-visible{outline:3px solid rgba(18,101,197,.28);outline-offset:3px}
.container{width:min(var(--container),calc(100% - 48px));margin:0 auto}
.section{padding:94px 0;position:relative;overflow:hidden}
.section-soft{background:var(--bg)}
.section-head{max-width:760px;margin-bottom:42px}
.eyebrow{display:inline-flex;align-items:center;gap:8px;color:var(--blue);font-size:13px;font-weight:700;letter-spacing:.08em}
.eyebrow:before{content:"";width:26px;height:2px;background:var(--blue)}
h1,h2,h3,p{margin-top:0}
h1,h2,h3{color:var(--ink);line-height:1.25}
h1{font-size:clamp(35px,5vw,62px);margin-bottom:22px;letter-spacing:0}
h2{font-size:clamp(27px,3.3vw,40px);margin-bottom:16px}
h3{font-size:20px;margin-bottom:9px}
.section-head p{color:var(--muted);max-width:710px;margin-bottom:0}
.btn{min-height:46px;padding:11px 21px;border-radius:8px;border:1px solid transparent;display:inline-flex;align-items:center;justify-content:center;gap:9px;font-weight:700;transition:.22s ease;white-space:nowrap}
.btn-primary{background:var(--blue);color:#fff;box-shadow:0 8px 16px rgba(18,101,197,.2)}
.btn-primary:hover{background:var(--blue-dark);transform:translateY(-2px)}
.btn-primary:active{transform:translateY(0)}
.btn-outline{background:#fff;border-color:#c7d8e9;color:var(--blue)}
.btn-outline:hover{border-color:var(--blue);background:var(--blue-soft)}
.btn-light{background:#fff;color:var(--blue)}
.btn-light:hover{background:#dfeeff;transform:translateY(-2px)}
.badge{display:inline-flex;align-items:center;padding:4px 10px;border-radius:999px;background:var(--blue-soft);color:var(--blue);font-size:12px;font-weight:700}
.site-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.96);backdrop-filter:blur(10px);box-shadow:0 1px 0 rgba(17,49,78,.08)}
.topbar{border-bottom:1px solid var(--line);font-size:13px;color:var(--muted)}
.topbar-inner{min-height:42px;display:flex;align-items:center;justify-content:space-between;gap:18px}
.brand{display:flex;align-items:center;gap:10px;font-size:18px;font-weight:800;color:var(--ink)}
.brand-mark{width:30px;height:30px;border-radius:8px;background:var(--blue);display:grid;place-items:center;color:#fff;font-size:15px;font-weight:800}
.top-info{display:flex;align-items:center;gap:22px}
.top-info strong{color:var(--ink)}
.nav-row{min-height:66px;display:flex;align-items:center;justify-content:space-between;gap:24px}
.main-nav{display:flex;align-items:center;gap:5px}
.main-nav a{padding:9px 12px;border-radius:7px;color:#3a4b5e;font-size:14px;font-weight:700;transition:.2s}
.main-nav a:hover,.main-nav a.active{color:var(--blue);background:var(--blue-soft)}
.nav-cta{font-size:14px;padding:8px 15px;min-height:40px}
.menu-toggle{display:none;width:44px;height:44px;border:0;border-radius:8px;background:var(--blue-soft);color:var(--blue);font-size:22px}
.hero{padding:0;min-height:650px;background:#dcecf8;position:relative;display:flex;align-items:stretch;overflow:hidden}
.hero-slide{display:none;width:100%;min-height:650px;position:relative;background-size:cover;background-position:center}
.hero-slide.active{display:flex}
.hero-slide:after{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(7,32,58,.83) 0%,rgba(11,46,79,.66) 37%,rgba(14,55,89,.18) 73%,rgba(14,55,89,.12) 100%)}
.hero-slide.one{background-image:url('/assets/images/a887ba81df19033d.webp')}
.hero-slide.two{background-image:url('/assets/images/bf079856417f23bc.webp')}
.hero-slide.three{background-image:url('/assets/images/64e7aeac045919ca.webp')}
.hero-inner{position:relative;z-index:2;width:min(var(--container),calc(100% - 48px));margin:auto;padding:82px 0 116px;color:#fff}
.hero-copy{max-width:660px}
.hero .eyebrow{color:#a9d5ff}
.hero .eyebrow:before{background:#7fc5ff}
.hero h1{color:#fff}
.hero p{max-width:650px;color:#e1effb;font-size:17px;line-height:1.85;margin-bottom:28px}
.hero-actions{display:flex;gap:13px;flex-wrap:wrap}
.hero-stage{position:absolute;z-index:3;right:max(24px,calc((100% - var(--container))/2));bottom:36px;width:min(435px,35vw);padding:18px;background:rgba(255,255,255,.96);border-radius:14px;box-shadow:0 18px 40px rgba(1,20,41,.24);color:var(--ink)}
.stage-top{display:flex;justify-content:space-between;align-items:center;margin-bottom:10px;font-size:13px}
.stage-screen{height:112px;border-radius:9px;background:#133959 url('/assets/images/97024652192a3bad.webp') center/cover no-repeat;position:relative;overflow:hidden}
.stage-screen:after{content:"车端软件平台 / 实时状态";position:absolute;left:12px;bottom:10px;padding:4px 8px;border-radius:5px;background:rgba(5,26,46,.78);color:#fff;font-size:12px}
.stage-data{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin-top:12px}
.stage-data div{padding:7px 5px;border-radius:7px;background:#f1f6fb;text-align:center;font-size:11px;color:var(--muted)}
.stage-data strong{display:block;color:var(--blue);font-size:16px}
.hero-controls{position:absolute;z-index:4;left:max(24px,calc((100% - var(--container))/2));bottom:35px;display:flex;align-items:center;gap:8px}
.hero-dot{width:9px;height:9px;padding:0;border-radius:50%;border:0;background:rgba(255,255,255,.55)}
.hero-dot.active{width:27px;border-radius:8px;background:#fff}
.pause-btn{width:35px;height:35px;border:1px solid rgba(255,255,255,.45);background:rgba(7,35,61,.36);border-radius:50%;color:#fff;margin-left:7px}
.hero-next{position:absolute;z-index:4;right:28px;top:50%;transform:translateY(-50%);width:44px;height:44px;border-radius:50%;border:1px solid rgba(255,255,255,.65);background:rgba(12,43,69,.38);color:#fff;font-size:23px}
.hero-peek{position:absolute;z-index:5;bottom:0;left:0;width:100%;background:#fff;padding:14px 0;color:var(--ink)}
.peek-inner{display:flex;align-items:center;justify-content:space-between;gap:20px;font-size:14px}
.peek-inner strong{color:var(--blue)}
.pain-grid{display:grid;grid-template-columns:1fr 1.2fr;gap:64px;align-items:center}
.pain-list{list-style:none;padding:0;margin:0;border-left:2px solid #cfe3f6}
.pain-list li{position:relative;padding:0 0 24px 30px}
.pain-list li:last-child{padding-bottom:0}
.pain-list li:before{content:"";position:absolute;left:-7px;top:8px;width:12px;height:12px;border-radius:50%;background:var(--blue);box-shadow:0 0 0 5px var(--blue-soft)}
.pain-list strong{display:block;color:var(--ink);font-size:18px;margin-bottom:3px}
.pain-list span{color:var(--muted);font-size:14px}
.problem-panel{background:#fff;border:1px solid var(--line);border-radius:var(--radius-lg);padding:29px;box-shadow:var(--shadow)}
.problem-panel img{width:100%;height:300px;object-fit:cover;border-radius:10px}
.problem-panel .caption{display:flex;gap:14px;align-items:center;margin-top:18px}
.caption-num{font-size:34px;font-weight:800;color:var(--blue);line-height:1}
.intro-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:65px;align-items:center}
.visual-frame{position:relative}
.visual-frame img{width:100%;height:430px;object-fit:cover;border-radius:15px;box-shadow:var(--shadow)}
.floating-note{position:absolute;right:-20px;bottom:25px;width:220px;padding:18px;background:#fff;border-radius:10px;box-shadow:var(--shadow)}
.floating-note strong{color:var(--blue);display:block;font-size:22px}
.check-list{list-style:none;padding:0;margin:24px 0 0}
.check-list li{padding:12px 0;border-bottom:1px solid var(--line);display:flex;gap:12px}
.check-list li:before{content:"✓";color:var(--success);font-weight:800}
.solution-flow{display:grid;grid-template-columns:repeat(5,1fr);gap:0;position:relative}
.solution-item{position:relative;padding:22px 17px;min-height:184px;border-top:3px solid #b8d9f3;background:#fff}
.solution-item:nth-child(2),.solution-item:nth-child(4){background:#f0f7fd}
.solution-item:after{content:"→";position:absolute;right:-10px;top:50%;z-index:2;color:var(--blue);font-size:21px;font-weight:800}
.solution-item:last-child:after{display:none}
.solution-icon{width:38px;height:38px;display:grid;place-items:center;background:var(--blue-soft);color:var(--blue);border-radius:8px;font-weight:800;margin-bottom:16px}
.solution-item p{font-size:13px;color:var(--muted);line-height:1.65;margin:0}
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.step{padding:25px 22px;border:1px solid var(--line);border-radius:10px;background:#fff;position:relative;transition:.2s}
.step:hover{transform:translateY(-4px);border-color:#a9cfed;box-shadow:var(--shadow)}
.step-no{font-size:14px;color:var(--blue);font-weight:800;margin-bottom:33px}
.step h3{font-size:19px}
.step p{font-size:14px;color:var(--muted);margin-bottom:0}
.advantage-grid{display:grid;grid-template-columns:1.35fr 1fr 1fr;grid-template-rows:auto auto;gap:17px}
.adv-card{border:1px solid var(--line);border-radius:12px;background:#fff;padding:24px;box-shadow:0 5px 18px rgba(29,76,120,.04);transition:.25s}
.adv-card:hover{border-color:#9cc8eb;transform:translateY(-3px);box-shadow:var(--shadow)}
.adv-card.featured{grid-row:span 2;background:#e9f4fe;display:flex;flex-direction:column;justify-content:flex-end;min-height:330px;background-image:linear-gradient(0deg,rgba(234,244,254,.96),rgba(234,244,254,.15)),url('/assets/images/1ddcaaf4356c159b.webp');background-size:cover;background-position:center}
.adv-symbol{font-size:25px;color:var(--blue);margin-bottom:26px}
.adv-card p{font-size:14px;color:var(--muted);margin:0}
.adv-card .badge{margin-top:15px}
.product-layout{display:grid;grid-template-columns:1.35fr .65fr;gap:20px}
.product-main{min-height:405px;padding:32px;background:#fff;border:1px solid var(--line);border-radius:15px;overflow:hidden;display:flex;flex-direction:column;justify-content:flex-end;position:relative}
.product-main img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;opacity:.33}
.product-main:after{content:"";position:absolute;inset:0;background:linear-gradient(0deg,#fff 10%,rgba(255,255,255,.15) 82%)}
.product-main>*{position:relative;z-index:1;max-width:460px}
.product-main p,.product-small p{font-size:14px;color:var(--muted);margin-bottom:18px}
.product-stack{display:grid;grid-template-rows:1fr 1fr;gap:20px}
.product-small{padding:22px;display:grid;grid-template-columns:115px 1fr;gap:18px;align-items:center;background:#fff;border:1px solid var(--line);border-radius:15px;transition:.2s}
.product-small:hover{box-shadow:var(--shadow);border-color:#a7cdea}
.product-small img{height:120px;width:115px;object-fit:cover;border-radius:9px}
.dark-case{background:var(--deep);color:#dae9f6}
.dark-case h2{color:#fff}
.dark-case .section-head p{color:#b9cee0}
.case-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:58px;align-items:center}
.case-grid img{height:390px;width:100%;object-fit:cover;border-radius:14px}
.case-label{color:#91d7ff;font-size:13px;font-weight:700}
.case-facts{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:25px}
.case-facts div{padding:15px;border:1px solid rgba(176,214,241,.25);border-radius:8px;background:rgba(255,255,255,.04)}
.case-facts strong{display:block;color:#fff;font-size:15px;margin-bottom:4px}
.case-facts span{font-size:13px;color:#b8cbdb}
.results{padding:56px 0;background:#e8f4fd}
.result-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.result-item{padding:10px 18px;border-right:1px solid #c6dfef}
.result-item:last-child{border-right:0}
.result-item strong{display:block;color:var(--blue);font-size:39px;line-height:1.15}
.result-item span{display:block;color:#556b80;font-size:14px;margin-top:5px}
.stories{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.story{background:#fff;border:1px solid var(--line);border-radius:12px;overflow:hidden;transition:.22s}
.story:hover{box-shadow:var(--shadow-hover);transform:translateY(-3px)}
.story img{width:100%;height:177px;object-fit:cover}
.story-content{padding:21px}
.story-content p{font-size:14px;color:var(--muted);margin:12px 0}
.story-meta{font-size:12px;color:var(--blue);font-weight:700}
.quote-grid{display:grid;grid-template-columns:1.1fr .9fr 1fr;gap:20px}
.quote{padding:27px;border-radius:12px;background:#fff;border:1px solid var(--line);position:relative}
.quote:nth-child(2){background:#edf6fe}
.quote-mark{font-size:46px;line-height:.7;color:#9ccdec;font-family:Georgia,serif}
.quote p{color:#40546a;font-size:15px;margin:12px 0 21px}
.quote footer{font-size:13px;color:var(--muted)}
.quote footer strong{color:var(--ink);display:block}
.scene-layout{display:grid;grid-template-columns:.82fr 1.18fr;gap:48px;align-items:start}
.scene-tabs{display:flex;flex-direction:column;gap:9px}
.scene-tab{padding:16px 18px;text-align:left;background:#fff;border:1px solid var(--line);border-radius:9px;color:var(--ink);font-weight:700;transition:.2s}
.scene-tab:hover,.scene-tab.active{background:var(--blue);border-color:var(--blue);color:#fff}
.scene-detail{padding:31px;background:#fff;border:1px solid var(--line);border-radius:14px;box-shadow:var(--shadow)}
.scene-detail p{color:var(--muted)}
.scene-points{display:grid;grid-template-columns:1fr 1fr;gap:11px;margin-top:20px}
.scene-points span{padding:10px 12px;background:var(--bg);border-radius:7px;font-size:13px;color:#506276}
.metric-table{width:100%;border-collapse:collapse;background:#fff;border:1px solid var(--line);border-radius:12px;overflow:hidden}
.metric-table th,.metric-table td{padding:17px 18px;text-align:left;border-bottom:1px solid var(--line)}
.metric-table tr:last-child td{border-bottom:0}
.metric-table th{background:#edf6fe;color:var(--ink);font-size:14px}
.metric-table td{font-size:14px;color:#516479}
.metric-table td:first-child{color:var(--ink);font-weight:700}
.news-grid{display:grid;grid-template-columns:1.1fr 1fr 1fr;gap:20px}
.news-card{padding:23px;background:#fff;border:1px solid var(--line);border-radius:12px;transition:.2s}
.news-card:first-child{background:#eff7fe}
.news-card:hover{border-color:#a5cdec;box-shadow:var(--shadow)}
.news-date{font-size:13px;color:var(--blue);font-weight:700}
.news-card h3{font-size:19px;margin:13px 0 9px}
.news-card p{font-size:14px;color:var(--muted);margin:0}
.faq-list{border-top:1px solid var(--line)}
.faq-item{border-bottom:1px solid var(--line)}
.faq-question{width:100%;padding:21px 4px;background:none;border:0;display:flex;align-items:center;justify-content:space-between;text-align:left;color:var(--ink);font-size:17px;font-weight:700}
.faq-question span:last-child{width:28px;height:28px;border-radius:50%;display:grid;place-items:center;background:var(--blue-soft);color:var(--blue);transition:.2s}
.faq-question[aria-expanded="true"] span:last-child{transform:rotate(45deg);background:var(--blue);color:#fff}
.faq-answer{display:none;padding:0 44px 21px 4px;color:var(--muted);font-size:15px}
.faq-answer.open{display:block}
.cta-section{padding:82px 0;background:#dff0fc}
.cta-box{display:grid;grid-template-columns:1fr .9fr;gap:45px;align-items:center;padding:48px;background:#fff;border:1px solid #c9e1f2;border-radius:18px;box-shadow:var(--shadow)}
.cta-box h2{margin-bottom:12px}
.cta-box p{color:var(--muted);margin-bottom:0}
.contact-form{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.form-group{display:flex;flex-direction:column;gap:5px}
.form-group.full{grid-column:1/-1}
.form-group label{font-size:13px;color:#516479;font-weight:700}
.form-group input,.form-group textarea{width:100%;border:1px solid #cbdceb;border-radius:8px;padding:11px 12px;color:var(--ink);background:#fff;transition:.2s}
.form-group input:focus,.form-group textarea:focus{border-color:var(--blue);box-shadow:0 0 0 3px rgba(18,101,197,.1);outline:none}
.form-group textarea{height:78px;resize:vertical}
.form-note{grid-column:1/-1;font-size:12px;color:var(--muted);margin:0}
.form-message{display:none;grid-column:1/-1;padding:10px;border-radius:7px;background:#e8f7ef;color:var(--success);font-size:13px}
.site-footer{background:#10273e;color:#b9cad8;padding:57px 0 0}
.footer-grid{display:grid;grid-template-columns:1.25fr .8fr 1fr;gap:42px;padding-bottom:42px}
.site-footer .brand{color:#fff;margin-bottom:15px}
.site-footer .brand-mark{background:#3789dd}
.footer-title{color:#fff;font-size:15px;font-weight:700;margin:0 0 14px}
.footer-links{list-style:none;padding:0;margin:0;display:grid;gap:8px;font-size:14px}
.footer-links a:hover{color:#fff}
.footer-contact{font-size:14px;line-height:2}
.copyright{border-top:1px solid rgba(255,255,255,.13);padding:17px 0;font-size:12px;color:#91a8ba}
@media(max-width:1024px){
  .main-nav{gap:0}.main-nav a{padding:8px 8px;font-size:13px}
  .hero-stage{right:24px;width:320px}.solution-flow{grid-template-columns:repeat(5,1fr)}
  .advantage-grid{grid-template-columns:1.2fr 1fr 1fr}.product-layout{grid-template-columns:1fr}
  .product-stack{grid-template-columns:1fr 1fr;grid-template-rows:auto}.product-small{grid-template-columns:100px 1fr}
}
@media(max-width:768px){
  html{scroll-padding-top:76px}.container{width:min(100% - 32px, var(--container))}
  .topbar{display:none}.nav-row{min-height:68px}.nav-cta{display:none}
  .menu-toggle{display:grid;place-items:center}.main-nav{display:none;position:absolute;top:68px;left:0;width:100%;padding:12px 16px 17px;background:#fff;border-top:1px solid var(--line);box-shadow:0 14px 24px rgba(20,55,86,.1);flex-direction:column;align-items:stretch}
  .main-nav.open{display:flex}.main-nav a{min-height:44px;padding:11px 13px}
  .hero,.hero-slide{min-height:665px}.hero-inner{padding:65px 0 210px}.hero p{font-size:15px}
  .hero-stage{left:16px;right:16px;bottom:64px;width:auto}.hero-controls{left:16px;bottom:15px}.hero-next{display:none}.hero-peek{display:none}
  .section{padding:68px 0}.pain-grid,.intro-grid,.case-grid,.scene-layout,.cta-box{grid-template-columns:1fr;gap:32px}
  .problem-panel img{height:235px}.visual-frame img{height:330px}.floating-note{right:10px}
  .solution-flow{grid-template-columns:1fr 1fr;gap:10px}.solution-item:after{display:none}.solution-item{min-height:158px;border:1px solid var(--line);border-top:3px solid #b8d9f3}
  .steps{grid-template-columns:1fr 1fr}.advantage-grid{grid-template-columns:1fr 1fr}.adv-card.featured{grid-column:span 2;grid-row:auto;min-height:260px}
  .result-grid{grid-template-columns:1fr 1fr}.result-item:nth-child(2){border-right:0}.result-item{padding:13px}.stories,.quote-grid,.news-grid{grid-template-columns:1fr}
  .scene-tabs{display:grid;grid-template-columns:1fr 1fr}.metric-table{display:block;overflow-x:auto}.footer-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:520px){
  body{font-size:15px}.brand{font-size:16px}.section{padding:58px 0}.section-head{margin-bottom:30px}
  h1{font-size:35px}.hero,.hero-slide{min-height:690px}.hero-inner{padding-top:56px}.hero-actions{flex-direction:column;align-items:stretch}.hero-actions .btn{width:100%}
  .hero-stage{padding:13px}.stage-screen{height:92px}.stage-data strong{font-size:14px}
  .pain-list li{padding-left:25px}.solution-flow,.steps,.advantage-grid,.product-stack,.result-grid,.scene-points,.contact-form,.footer-grid{grid-template-columns:1fr}
  .adv-card.featured{grid-column:auto}.product-small{grid-template-columns:90px 1fr}.product-small img{width:90px;height:100px}
  .result-item,.result-item:nth-child(2){border-right:0;border-bottom:1px solid #c6dfef}.result-item:last-child{border-bottom:0}
  .scene-tabs{grid-template-columns:1fr}.case-facts{grid-template-columns:1fr}.metric-table th,.metric-table td{padding:14px 12px;white-space:normal}
  .cta-box{padding:28px 20px}.footer-grid{gap:25px}.footer-grid>div:first-child{grid-column:1/-1}
}