/* roulang page: index */
:root{
  --blue:#2d6e9f;--blue-dark:#20587f;--ink:#183243;--muted:#647987;--teal:#21a59a;
  --pale:#eaf3f8;--warm:#f8fafa;--line:#d9e5ea;--white:#fff;--night:#18313a;
  --night-soft:#254650;--shadow:0 12px 30px rgba(24,50,67,.08);--shadow-lg:0 18px 40px rgba(24,50,67,.14);
  --r-sm:12px;--r:16px;--r-lg:20px;--container:1240px;--ease:all .25s ease;
}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:120px}body{margin:0;color:var(--ink);font-family:"PingFang SC","Microsoft YaHei","Noto Sans SC","Helvetica Neue",Arial,sans-serif;background:var(--warm);line-height:1.72;font-size:16px}a{color:inherit;text-decoration:none}img{display:block;max-width:100%}button,input,select,textarea{font:inherit}button{cursor:pointer}button,input,select,textarea{border:0}::selection{background:#c9e6e4;color:var(--ink)}
.container{width:min(calc(100% - 48px),var(--container));margin:auto}.section{padding:104px 0;position:relative;overflow:hidden}.section-soft{background:var(--pale)}.section-white{background:#fff}.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:24px;height:2px;background:var(--teal)}h1,h2,h3,p{margin-top:0}h1{font-size:clamp(38px,4.1vw,56px);line-height:1.18;letter-spacing:-.045em}h2{font-size:clamp(29px,3vw,40px);line-height:1.28;letter-spacing:-.035em;margin:12px 0 18px}h3{font-size:20px;line-height:1.4;margin:0 0 10px}.section-lead{max-width:710px;color:var(--muted);margin-bottom:38px}.btn{min-height:48px;display:inline-flex;align-items:center;justify-content:center;gap:9px;padding:0 21px;border-radius:12px;font-weight:700;transition:var(--ease);white-space:nowrap}.btn-primary{background:var(--blue);color:#fff;box-shadow:0 8px 18px rgba(45,110,159,.18)}.btn-primary:hover{background:var(--blue-dark);transform:translateY(-1px)}.btn-secondary{border:1px solid #b9cedb;background:#fff;color:var(--blue)}.btn-secondary:hover{background:var(--pale);border-color:var(--blue)}.btn:active{transform:translateY(1px)}a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible,summary:focus-visible{outline:3px solid rgba(33,165,154,.42);outline-offset:3px}
.topbar{background:var(--night);color:#d8e5e8;font-size:13px}.topbar .container{height:37px;display:flex;justify-content:space-between;align-items:center;gap:15px}.top-info,.top-contact{display:flex;gap:18px;align-items:center}.top-info span:before{content:"";display:inline-block;width:6px;height:6px;background:var(--teal);border-radius:50%;margin:0 7px 1px 0}.top-contact a{color:#fff;font-weight:600}
.site-header{position:sticky;top:0;z-index:90;background:rgba(255,255,255,.96);border-bottom:1px solid rgba(217,229,234,.9);transition:var(--ease)}.site-header.compact{box-shadow:0 5px 20px rgba(24,50,67,.09)}.navbar{height:78px;display:flex;align-items:center;justify-content:space-between;gap:24px}.brand{display:flex;align-items:center;gap:10px;font-size:19px;font-weight:800;color:var(--ink);white-space:nowrap}.brand-mark{width:32px;height:32px;border-radius:10px;background:var(--blue);position:relative;overflow:hidden}.brand-mark:before{content:"";position:absolute;width:21px;height:21px;border:2px solid #fff;border-radius:50%;left:5px;top:4px}.brand-mark:after{content:"";position:absolute;width:7px;height:11px;background:#fff;clip-path:polygon(50% 100%,0 0,100% 0);left:12px;top:11px}.nav-links{display:flex;align-items:center;justify-content:center;gap:22px;flex:1}.nav-links a{font-size:14px;color:#47606d;position:relative;padding:28px 0}.nav-links a:after{content:"";position:absolute;left:50%;bottom:18px;width:0;height:2px;background:var(--teal);transition:var(--ease)}.nav-links a:hover,.nav-links a.active{color:var(--blue)}.nav-links a:hover:after,.nav-links a.active:after{width:18px;left:calc(50% - 9px)}.nav-cta{min-height:42px;padding:0 16px}.menu-toggle{display:none;width:44px;height:44px;background:var(--pale);border-radius:10px;color:var(--ink);font-size:22px}.drawer{display:none}
.hero{height:670px;min-height:620px;position:relative;background:var(--night);overflow:hidden}.slides,.slide{height:100%}.slide{position:absolute;inset:0;opacity:0;visibility:hidden;transition:opacity .7s ease,visibility .7s}.slide.active{opacity:1;visibility:visible}.slide-bg{position:absolute;inset:0;background-size:cover;background-position:center}.slide-bg:after{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(11,34,45,.87) 0%,rgba(14,42,53,.65) 42%,rgba(14,42,53,.15) 74%,rgba(14,42,53,.32) 100%)}.hero-content{position:relative;height:100%;display:flex;align-items:center;padding-bottom:42px;color:#fff}.hero-copy{max-width:680px}.hero .eyebrow{color:#b7e7e1}.hero h1{margin:14px 0 22px;max-width:630px}.hero p{font-size:17px;line-height:1.85;color:#e2ecee;max-width:650px;margin-bottom:29px}.hero-actions{display:flex;gap:13px;flex-wrap:wrap}.hero .btn-secondary{background:rgba(255,255,255,.92);border-color:#fff}.play-chip{display:inline-flex;align-items:center;gap:11px;margin-bottom:20px;font-size:14px;color:#d8eeed}.play-icon{width:36px;height:36px;border:1px solid rgba(255,255,255,.7);border-radius:50%;display:grid;place-items:center;padding-left:2px;background:rgba(255,255,255,.12)}.hero-controls{position:absolute;left:50%;bottom:42px;transform:translateX(-50%);width:min(calc(100% - 48px),var(--container));display:flex;justify-content:flex-end;align-items:center;gap:12px;z-index:3}.slide-count{font-size:14px;font-weight:700;color:#fff;letter-spacing:.12em}.progress{width:130px;height:3px;background:rgba(255,255,255,.35);overflow:hidden}.progress i{display:block;height:100%;width:33.33%;background:#7ed7d0;transition:width .45s ease}.control{width:40px;height:40px;border-radius:10px;border:1px solid rgba(255,255,255,.6);background:rgba(255,255,255,.85);color:var(--ink);font-size:19px}.control:hover{background:#fff}.hero-cut{position:absolute;bottom:-1px;left:0;width:100%;height:56px;background:var(--warm);clip-path:polygon(0 69%,100% 0,100% 100%,0 100%);z-index:2}
.intro-grid{display:grid;grid-template-columns:1.08fr .92fr;gap:76px;align-items:center}.visual-frame{position:relative}.visual-frame img{width:100%;height:440px;object-fit:cover;border-radius:var(--r-lg);border:8px solid #fff;box-shadow:var(--shadow-lg)}.map-card{position:absolute;right:-25px;bottom:28px;background:#fff;padding:16px 18px;border-radius:14px;box-shadow:var(--shadow);font-size:13px;max-width:220px}.map-card strong{display:block;font-size:22px;color:var(--teal)}.check-list{list-style:none;margin:25px 0;padding:0;display:grid;gap:12px}.check-list li{padding:11px 13px 11px 40px;border:1px solid var(--line);border-radius:10px;font-size:14px;position:relative;background:#fbfdfd}.check-list li:before{content:"✓";position:absolute;left:14px;top:10px;color:var(--teal);font-weight:800}.text-link{color:var(--blue);font-weight:700;border-bottom:1px solid currentColor;padding-bottom:3px}
.trio{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}.feature-card{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:28px;box-shadow:var(--shadow);position:relative;overflow:hidden;transition:var(--ease)}.feature-card:before{content:"";position:absolute;left:0;right:0;top:0;height:4px;background:var(--blue)}.feature-card:nth-child(2):before{background:var(--teal)}.feature-card:nth-child(3):before{background:#6c9fbe}.feature-card:hover{transform:translateY(-5px);box-shadow:var(--shadow-lg)}.line-icon{width:48px;height:48px;color:var(--blue);margin-bottom:19px}.line-icon svg{width:100%;height:100%;fill:none;stroke:currentColor;stroke-width:1.8}.feature-card p,.adv-card p{color:var(--muted);font-size:14px;margin:0}.micro-tag{display:inline-flex;margin-top:19px;padding:4px 9px;border-radius:7px;background:var(--pale);color:var(--blue);font-size:12px;font-weight:700}
.advantages-head{display:flex;justify-content:space-between;align-items:end;gap:30px;margin-bottom:37px}.advantages-head .section-lead{margin:0}.adv-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}.adv-card{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:25px 26px;display:grid;grid-template-columns:55px 1fr;gap:17px;transition:var(--ease)}.adv-card:hover{transform:translateY(-5px);box-shadow:var(--shadow-lg);border-color:#b7d6dc}.adv-card:hover .route-symbol{transform:translateX(4px)}.route-symbol{width:52px;height:52px;border-radius:14px;background:var(--pale);color:var(--teal);display:grid;place-items:center;transition:var(--ease)}.route-symbol svg{width:29px;height:29px;fill:none;stroke:currentColor;stroke-width:1.8}
.scene-map{background-color:#eff6f8;background-image:linear-gradient(rgba(45,110,159,.06) 1px,transparent 1px),linear-gradient(90deg,rgba(45,110,159,.06) 1px,transparent 1px);background-size:28px 28px}.scene-route{position:relative;display:grid;grid-template-columns:repeat(4,1fr);gap:0;margin-top:48px}.scene-route:before{content:"";position:absolute;top:29px;left:8%;right:8%;height:2px;background:linear-gradient(90deg,var(--teal),var(--blue),var(--teal));opacity:.62}.scene{position:relative;padding:0 18px 0 0}.scene-no{width:60px;height:60px;border-radius:50%;display:grid;place-items:center;background:#fff;border:2px solid #9bd5d1;color:var(--blue);font-weight:800;position:relative;z-index:1;margin-bottom:22px}.scene h3{font-size:18px}.scene p{font-size:14px;color:var(--muted);margin:0 0 12px}.scene a{font-size:14px;color:var(--blue);font-weight:700}
.product-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;align-items:end}.solution{background:#fff;border:1px solid var(--line);border-radius:var(--r-lg);overflow:hidden;box-shadow:var(--shadow);transition:var(--ease)}.solution.featured{transform:translateY(-18px);border-color:#9fcbd9}.solution:hover{box-shadow:var(--shadow-lg);transform:translateY(-5px)}.solution.featured:hover{transform:translateY(-22px)}.solution img{width:100%;height:183px;object-fit:cover}.solution-body{padding:24px}.solution-body p{font-size:14px;color:var(--muted);margin-bottom:15px}.tags{display:flex;flex-wrap:wrap;gap:7px;margin:15px 0 21px}.tags span{font-size:12px;padding:4px 8px;border-radius:6px;background:var(--pale);color:#416879}.solution .btn{width:100%}
.dark-case{background:var(--night);color:#edf5f4}.dark-case:before{content:"";position:absolute;inset:0;background-image:linear-gradient(rgba(151,205,200,.08) 1px,transparent 1px),linear-gradient(90deg,rgba(151,205,200,.08) 1px,transparent 1px);background-size:36px 36px;opacity:.45}.case-grid{display:grid;grid-template-columns:1fr 1fr;gap:76px;align-items:center;position:relative}.case-image{position:relative}.case-image img{width:100%;height:430px;object-fit:cover;border-radius:var(--r-lg);opacity:.9}.case-image:after{content:"路线辅助 / 夜间道路";position:absolute;left:20px;bottom:20px;background:rgba(16,37,45,.8);border:1px solid rgba(200,235,231,.35);border-radius:9px;padding:8px 12px;font-size:13px}.dark-case h2{color:#fff}.dark-case .section-lead{color:#c0d2d5}.compare{display:grid;grid-template-columns:1fr 1fr;border:1px solid rgba(194,222,220,.25);border-radius:var(--r);overflow:hidden}.compare div{padding:18px;border-bottom:1px solid rgba(194,222,220,.18);font-size:14px}.compare div:nth-child(odd){background:rgba(255,255,255,.04);color:#cddbdd}.compare div:nth-child(even){color:#fff}.compare strong{display:block;color:#7ad7d0;font-size:13px;margin-bottom:4px}
.story-layout{display:grid;grid-template-columns:1fr 1.25fr;gap:55px;align-items:start}.story-list{display:grid;gap:16px}.story{padding:23px 23px 20px;border-left:3px solid var(--teal);background:#fff;border-radius:0 var(--r) var(--r) 0;box-shadow:var(--shadow)}.story-meta{color:var(--blue);font-size:13px;font-weight:700;margin-bottom:8px}.story p{font-size:14px;color:var(--muted);margin:0}.story-photo img{height:420px;width:100%;object-fit:cover;border-radius:var(--r-lg)}.story-photo small{display:block;color:var(--muted);padding:11px 4px}
.stats{padding:64px 0;background:#fff;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}.stats-grid{display:grid;grid-template-columns:repeat(4,1fr)}.stat{padding:8px 30px;border-right:1px solid var(--line)}.stat:last-child{border:0}.stat-num{font-size:39px;font-weight:800;line-height:1;color:var(--teal);font-variant-numeric:tabular-nums}.stat-label{font-weight:700;margin:10px 0 3px}.stat small{font-size:12px;color:var(--muted)}
.review-layout{display:grid;grid-template-columns:1.1fr .9fr;gap:50px}.reviews{display:grid;gap:14px}.review{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:20px 24px;position:relative}.review:before{content:"“";font-size:48px;line-height:.5;color:#a6d9d5;position:absolute;right:22px;top:25px}.review p{font-size:14px;color:#526a76;margin:0 0 8px;padding-right:30px}.review small{color:var(--blue);font-weight:700}.rating-box{background:var(--pale);border-radius:var(--r-lg);padding:33px}.rating-box .score{font-size:52px;font-weight:800;color:var(--ink);line-height:1}.stars{color:#d7a94a;letter-spacing:3px;margin:9px 0 25px}.bar-row{display:grid;grid-template-columns:56px 1fr 34px;gap:10px;align-items:center;font-size:13px;margin:12px 0}.bar{height:7px;background:#d7e6eb;border-radius:6px;overflow:hidden}.bar i{display:block;height:100%;background:var(--teal);border-radius:6px}
.news-grid{display:grid;gap:0;border-top:1px solid var(--line)}.news{display:grid;grid-template-columns:190px 1fr auto;gap:25px;align-items:center;padding:22px 0;border-bottom:1px solid var(--line);transition:var(--ease)}.news:hover{padding-left:10px;background:#fbfdfd}.news img{width:190px;height:105px;object-fit:cover;border-radius:10px}.news-meta{font-size:12px;color:var(--blue);font-weight:700}.news h3{margin:7px 0;font-size:19px}.news p{margin:0;color:var(--muted);font-size:14px}.arrow{font-size:25px;color:var(--teal)}
.faq-wrap{max-width:900px;margin:0 auto}.faq{background:#fff;border:1px solid var(--line);border-radius:12px;margin-bottom:12px;overflow:hidden}.faq[open]{background:#f9fdfd;border-color:#b7dad7}.faq summary{list-style:none;min-height:64px;padding:19px 52px 18px 22px;font-size:16px;font-weight:700;cursor:pointer;position:relative}.faq summary::-webkit-details-marker{display:none}.faq summary:after{content:"+";position:absolute;right:21px;top:13px;color:var(--blue);font-size:26px;font-weight:400}.faq[open] summary{border-left:3px solid var(--teal);padding-left:19px}.faq[open] summary:after{content:"−";color:var(--teal)}.faq p{padding:0 22px 20px;color:var(--muted);font-size:14px;margin:0}
.guarantee{padding:53px 0;background:#fff}.guarantee-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}.guard{display:flex;align-items:center;gap:13px;padding:8px}.guard-icon{width:42px;height:42px;border-radius:12px;background:var(--pale);color:var(--blue);display:grid;place-items:center;font-size:20px}.guard strong{display:block;font-size:15px}.guard small{display:block;color:var(--muted);font-size:12px}
.contact-section{padding:100px 0;background:#e8f3f6;position:relative}.contact-section:before{content:"";position:absolute;left:-5%;bottom:0;width:110%;height:180px;background:repeating-linear-gradient(155deg,transparent 0,transparent 26px,rgba(33,165,154,.17) 27px,rgba(33,165,154,.17) 29px,transparent 30px,transparent 62px);opacity:.55}.contact-grid{position:relative;display:grid;grid-template-columns:.9fr 1.1fr;gap:62px;align-items:center}.contact-note{color:var(--muted);max-width:450px}.contact-phone{font-size:26px;font-weight:800;color:var(--blue);margin:22px 0 4px}.contact-time{font-size:14px;color:var(--muted)}.form-card{background:#fff;padding:30px;border-radius:var(--r-lg);box-shadow:var(--shadow-lg)}.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}.field{display:grid;gap:7px}.field.full{grid-column:1/-1}.field label{font-size:14px;font-weight:700}.required{color:var(--teal)}.field input,.field select,.field textarea{width:100%;border:1px solid var(--line);border-radius:9px;padding:11px 12px;background:#fcfefe;color:var(--ink);outline:none;transition:var(--ease)}.field textarea{height:82px;resize:vertical}.field input:focus,.field select:focus,.field textarea:focus{border-color:var(--teal);box-shadow:0 0 0 3px rgba(33,165,154,.12)}.form-submit{width:100%;margin-top:19px}.form-status{min-height:22px;margin:10px 0 0;color:#238276;font-size:13px}
.footer{background:var(--night);color:#c9d6d9;padding:64px 0 94px}.footer-grid{display:grid;grid-template-columns:1.25fr .8fr 1fr;gap:60px}.footer .brand{color:#fff;margin-bottom:15px}.footer p{font-size:14px;margin:0;color:#b8c8cc}.footer h3{color:#fff;font-size:16px;margin-bottom:15px}.footer-links{display:grid;grid-template-columns:1fr 1fr;gap:9px}.footer a:hover{color:#7ed7d0}.footer-contact{display:grid;gap:8px;font-size:14px}.copyright{border-top:1px solid rgba(214,232,234,.16);margin-top:43px;padding-top:19px;font-size:13px;color:#90a8ae;display:flex;justify-content:space-between;gap:20px}
.fixed-cta{position:fixed;z-index:80;bottom:0;left:0;width:100%;background:rgba(255,255,255,.97);border-top:1px solid var(--line);box-shadow:0 -5px 22px rgba(24,50,67,.09)}.fixed-cta .container{min-height:66px;display:flex;align-items:center;justify-content:space-between;gap:20px}.fixed-copy{font-size:14px;color:#536b76}.fixed-copy strong{color:var(--ink);margin-right:12px}.fixed-copy a{color:var(--blue);font-weight:800}.mobile-actions{display:none}
@media(max-width:1100px){.nav-links{gap:14px}.nav-links a{font-size:13px}.intro-grid,.case-grid{gap:42px}.contact-grid{gap:38px}}
@media(max-width:900px){.nav-links,.navbar>.nav-cta{display:none}.menu-toggle{display:grid;place-items:center}.drawer{display:block;position:fixed;right:-310px;top:0;height:100vh;width:min(86vw,310px);background:#fff;z-index:120;padding:26px;box-shadow:-10px 0 35px rgba(24,50,67,.18);transition:right .3s ease}.drawer.open{right:0}.drawer-head{display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid var(--line);padding-bottom:18px;margin-bottom:15px}.drawer a{display:block;padding:15px 5px;border-bottom:1px solid #edf3f5;color:var(--ink);font-weight:700}.drawer .btn{margin-top:20px;width:100%}.intro-grid,.case-grid,.contact-grid,.review-layout{grid-template-columns:1fr}.intro-grid{gap:35px}.intro-copy{order:-1}.visual-frame img{height:370px}.story-layout{grid-template-columns:1fr;gap:30px}.story-photo{display:none}.adv-grid{grid-template-columns:1fr}.scene-route{grid-template-columns:repeat(2,1fr);gap:32px}.scene-route:before{display:none}.product-grid{gap:17px}.solution.featured{transform:translateY(-8px)}.footer-grid{gap:35px;grid-template-columns:1fr 1fr}}
@media(max-width:680px){body{font-size:15px}.container{width:min(calc(100% - 32px),var(--container))}.section{padding:68px 0}.top-info{display:none}.topbar .container{justify-content:center;height:35px}.top-contact{gap:10px;font-size:12px}.navbar{height:66px}.brand{font-size:17px}.hero{height:640px;min-height:620px}.hero-content{padding-bottom:70px}.hero p{font-size:15px;line-height:1.75}.hero-actions .btn{width:100%}.hero-controls{bottom:31px;justify-content:flex-start}.progress{width:90px}.trio,.product-grid{grid-template-columns:1fr}.feature-card{padding:25px}.advantages-head{display:block}.advantages-head .section-lead{margin-bottom:20px}.scene-route{grid-template-columns:1fr;gap:26px;margin-top:32px}.scene{padding-left:76px;min-height:64px}.scene-no{position:absolute;left:0;top:0;margin:0}.solution.featured,.solution.featured:hover{transform:none}.solution img{height:190px}.case-image img{height:280px}.compare{grid-template-columns:1fr 1fr}.compare div{padding:13px;font-size:12px}.stats{padding:43px 0}.stats-grid{grid-template-columns:1fr 1fr;gap:25px}.stat{border-right:0;padding:4px 12px}.stat-num{font-size:32px}.news{grid-template-columns:105px 1fr;gap:14px}.news img{width:105px;height:94px}.news p{display:none}.news .arrow{display:none}.news h3{font-size:16px;margin:5px 0}.guarantee-grid{grid-template-columns:1fr 1fr}.contact-section{padding:72px 0}.form-grid{grid-template-columns:1fr}.field.full{grid-column:auto}.form-card{padding:22px}.footer{padding-bottom:112px}.footer-grid{grid-template-columns:1fr;gap:28px}.copyright{display:block;line-height:1.9}.fixed-cta .container{height:63px}.fixed-copy{display:none}.fixed-cta .btn{display:none}.mobile-actions{display:grid;grid-template-columns:44px 1fr 1fr;gap:8px;width:100%}.mobile-actions a{min-height:44px;border-radius:9px;display:grid;place-items:center;font-weight:700;font-size:13px}.mobile-actions a:first-child{background:var(--pale);color:var(--blue);font-size:20px}.mobile-actions a:nth-child(2){background:#fff;border:1px solid var(--line);color:var(--blue)}.mobile-actions a:last-child{background:var(--blue);color:#fff}}
@media(max-width:390px){.hero h1{font-size:34px}.top-contact span:last-child{display:none}.compare div{font-size:11px;padding:11px}.guarantee-grid{gap:7px}.guard{padding:4px;gap:8px}.guard-icon{width:36px;height:36px}.guard small{font-size:11px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.slide,.progress i,*{transition:none!important;animation:none!important}.feature-card:hover,.adv-card:hover,.solution:hover{transform:none}}