/* roulang page: index */
:root{
            --blue:#1769d2;--blue-dark:#0d3f88;--cyan:#20b8c8;--orange:#f27b4b;
            --ink:#14243b;--muted:#66758a;--soft:#f4f8fc;--pale:#eaf4ff;
            --line:#dce7f2;--white:#fff;--success:#168b63;--error:#c94a4a;
            --radius:16px;--radius-sm:11px;--shadow:0 14px 38px rgba(25,73,124,.10);
            --shadow-hover:0 20px 48px rgba(25,73,124,.16);--container:1200px;
            --h1:clamp(2.5rem,5vw,4.7rem);--h2:clamp(1.8rem,3vw,2.8rem);
            --body:16px;--lh:1.75;
        }
        *{box-sizing:border-box;margin:0;padding:0}
        html{scroll-behavior:smooth}
        body{font-family:"PingFang SC","Microsoft YaHei","Noto Sans CJK SC",Arial,sans-serif;color:var(--ink);font-size:var(--body);line-height:var(--lh);background:var(--white);overflow-x:hidden}
        a{color:inherit;text-decoration:none}
        button,input,textarea{font:inherit}
        button{border:0;cursor:pointer}
        img{max-width:100%;display:block}
        ul{list-style:none}
        section{scroll-margin-top:110px}
        .container{width:min(var(--container),calc(100% - 48px));margin:0 auto}
        .eyebrow{display:inline-flex;align-items:center;gap:8px;color:var(--blue);font-size:13px;font-weight:700;letter-spacing:.12em;text-transform:uppercase;margin-bottom:14px}
        .eyebrow:before{content:"";width:24px;height:2px;background:var(--cyan)}
        h1,h2,h3{line-height:1.2;letter-spacing:-.035em}
        h2{font-size:var(--h2)}
        p{color:var(--muted)}
        .section-head{max-width:740px;margin-bottom:42px}
        .section-head p{margin-top:18px;font-size:17px}
        .btn{display:inline-flex;align-items:center;justify-content:center;gap:9px;min-height:48px;padding:0 22px;border-radius:10px;font-weight:700;transition:.25s ease;border:1px solid transparent}
        .btn-primary{background:var(--blue);color:#fff;box-shadow:0 8px 18px rgba(23,105,210,.2)}
        .btn-primary:hover{background:var(--blue-dark);transform:translateY(-2px);box-shadow:0 12px 24px rgba(23,105,210,.28)}
        .btn-primary:active{transform:translateY(0)}
        .btn-secondary{background:#fff;color:var(--blue);border-color:#bfd5eb}
        .btn-secondary:hover{border-color:var(--blue);background:var(--pale);transform:translateY(-2px)}
        .btn:focus-visible,a:focus-visible,input:focus-visible,textarea:focus-visible,summary:focus-visible{outline:3px solid rgba(32,184,200,.42);outline-offset:3px}
        .site-header{position:sticky;top:0;z-index:20;background:rgba(255,255,255,.96);border-bottom:1px solid var(--line);backdrop-filter:blur(12px)}
        .topbar{min-height:68px;display:flex;align-items:center;justify-content:space-between;gap:20px}
        .brand{display:flex;align-items:center;gap:11px;font-weight:800;font-size:20px;color:var(--blue-dark);white-space:nowrap}
        .brand-mark{width:34px;height:34px;border-radius:10px;background:var(--blue);display:grid;place-items:center;position:relative;overflow:hidden}
        .brand-mark i{display:block;width:4px;height:15px;border-radius:4px;background:#fff;box-shadow:7px -5px 0 var(--cyan),14px 3px 0 #fff}
        .top-contact{display:flex;align-items:center;gap:20px;color:var(--muted);font-size:14px}
        .top-contact strong{color:var(--ink)}
        .nav-row{border-top:1px solid #f0f4f8}
        .nav-inner{min-height:48px;display:flex;align-items:center;justify-content:space-between}
        .nav-links{display:flex;gap:30px;align-items:center}
        .nav-links a{font-size:14px;color:#53647a;position:relative;padding:12px 0}
        .nav-links a:hover,.nav-links a.active{color:var(--blue);font-weight:700}
        .nav-links a.active:after{content:"";position:absolute;bottom:0;left:0;right:0;height:2px;background:var(--blue)}
        .menu-toggle{display:none;background:transparent;color:var(--ink);font-size:25px;min-width:44px;min-height:44px}
        .hero{background:linear-gradient(135deg,#f5faff 0%,#fff 58%);padding:76px 0 92px;position:relative;overflow:hidden}
        .hero:after{content:"";position:absolute;width:520px;height:520px;border-radius:50%;right:-230px;top:-220px;background:#e4f5ff;z-index:0}
        .hero-grid{position:relative;z-index:1;display:grid;grid-template-columns:1fr 1fr;gap:70px;align-items:center}
        .hero h1{font-size:var(--h1);max-width:650px}
        .hero h1 span{color:var(--blue)}
        .hero-copy{font-size:18px;max-width:650px;margin:24px 0 30px;line-height:1.9}
        .hero-actions{display:flex;flex-wrap:wrap;gap:12px}
        .hero-proof{display:flex;gap:24px;margin-top:34px;flex-wrap:wrap}
        .hero-proof b{display:block;font-size:21px;color:var(--ink)}
        .hero-proof small{color:var(--muted)}
        .hero-stage{min-height:420px;background:#fff;border:1px solid #d8e8f7;border-radius:24px;box-shadow:var(--shadow);padding:14px;position:relative}
        .hero-stage img{height:190px;width:100%;object-fit:cover;border-radius:15px;opacity:.9}
        .wave-panel{padding:20px 20px 12px}
        .wave-title{display:flex;justify-content:space-between;align-items:center;margin-bottom:18px;font-weight:700}
        .wave-title span{font-size:12px;color:var(--success);background:#e6f8f0;padding:4px 9px;border-radius:20px}
        .wave{height:64px;display:flex;gap:4px;align-items:center;border-top:1px solid #eef3f8;border-bottom:1px solid #eef3f8}
        .wave i{width:4px;background:var(--cyan);border-radius:5px;opacity:.85}
        .wave i:nth-child(odd){height:22px}.wave i:nth-child(3n){height:44px}.wave i:nth-child(4n){height:31px}.wave i:nth-child(5n){height:53px}
        .control-row{display:flex;align-items:center;gap:12px;margin-top:17px;color:var(--muted);font-size:13px}
        .play{width:40px;height:40px;border-radius:50%;background:var(--orange);color:#fff;display:grid;place-items:center}
        .range{height:5px;border-radius:5px;background:#dceef5;flex:1;position:relative}.range:before{content:"";display:block;width:62%;height:100%;background:var(--cyan);border-radius:5px}
        .slide-points{display:flex;gap:7px;position:absolute;bottom:20px;left:50%;transform:translateX(-50%)}
        .slide-points button{width:8px;height:8px;border-radius:50%;background:#b6cadd}.slide-points button.active{width:24px;border-radius:8px;background:var(--blue)}
        .carousel-control{position:absolute;top:47%;width:38px;height:38px;border-radius:50%;background:#fff;border:1px solid var(--line);color:var(--blue);z-index:2}.carousel-control:hover{background:var(--pale)}.prev{left:-18px}.next{right:-18px}
        .section{padding:104px 0}.section-alt{background:var(--soft)}.section-pale{background:var(--pale)}
        .pain-list{display:grid;grid-template-columns:repeat(4,1fr);gap:0;border:1px solid var(--line);border-radius:18px;overflow:hidden;background:#fff;box-shadow:var(--shadow)}
        .pain-item{padding:28px 25px;border-right:1px solid var(--line)}.pain-item:last-child{border-right:0}
        .pain-item .tag{color:var(--orange);font-size:12px;font-weight:700}.pain-item h3{font-size:19px;margin:12px 0 8px}.pain-item p{font-size:14px;line-height:1.7}
        .mini-wave{height:28px;display:flex;align-items:center;gap:3px;margin-top:18px}.mini-wave i{width:3px;background:var(--cyan);border-radius:3px}.mini-wave i:nth-child(odd){height:10px}.mini-wave i:nth-child(3n){height:23px}.mini-wave i:nth-child(4n){height:16px}
        .solution-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:65px;align-items:center}
        .workbench{background:#102a4c;border-radius:22px;padding:17px;box-shadow:var(--shadow);color:#fff}.workbench img{width:100%;height:230px;object-fit:cover;border-radius:13px;opacity:.78}.workbench-body{padding:22px 9px 8px}.workbench-body p{color:#bdd0e5;font-size:14px;margin:10px 0 18px}.sliders{display:grid;grid-template-columns:repeat(3,1fr);gap:9px}.slider-box{background:#18385f;border-radius:9px;padding:11px;font-size:12px;color:#bdd0e5}.slider-box b{display:block;color:#fff;margin-top:4px}.slider-line{height:4px;background:#32547b;border-radius:4px;margin-top:9px}.slider-line i{display:block;width:65%;height:100%;background:var(--cyan);border-radius:4px}
        .feature-list{display:grid;gap:19px;margin-top:27px}.feature-list li{display:flex;gap:14px}.feature-list li:before{content:"✓";flex:0 0 24px;height:24px;border-radius:50%;background:#e4f6f5;color:var(--success);display:grid;place-items:center;font-weight:800}.feature-list b{display:block;margin-bottom:3px}.feature-list span{font-size:14px;color:var(--muted)}
        .verify-note{display:inline-flex;margin-top:24px;color:var(--success);background:#edf9f4;border:1px solid #cdebdc;padding:8px 12px;border-radius:8px;font-size:13px}
        .ability-grid{display:grid;grid-template-columns:1.2fr .8fr 1fr;gap:18px}.ability-card{padding:28px;background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:0 6px 20px rgba(25,73,124,.05);min-height:190px;transition:.25s}.ability-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-hover);border-color:#b9d6f1}.ability-card:nth-child(2){margin-top:28px}.ability-card:nth-child(4){margin-top:-18px}.ability-card:nth-child(5){margin-top:10px}.ability-no{font-size:13px;color:var(--cyan);font-weight:800}.ability-card h3{font-size:20px;margin:16px 0 9px}.ability-card p{font-size:14px}
        .steps{display:grid;grid-template-columns:repeat(5,1fr);gap:0;position:relative}.steps:before{content:"";height:2px;background:#b7e2e6;position:absolute;top:27px;left:8%;right:8%}.step{position:relative;text-align:center;padding:0 12px}.step-no{width:56px;height:56px;margin:0 auto 20px;background:#fff;border:2px solid var(--cyan);color:var(--blue);border-radius:50%;display:grid;place-items:center;font-weight:800;position:relative;z-index:1}.step h3{font-size:17px;margin-bottom:8px}.step p{font-size:13px}
        .scene-grid{display:grid;grid-template-columns:1.25fr .75fr .95fr;grid-template-rows:190px 190px;gap:16px}.scene{border-radius:17px;overflow:hidden;position:relative;background-size:cover;background-position:center;min-height:160px}.scene:first-child{grid-row:span 2}.scene:after{content:"";position:absolute;inset:0;background:linear-gradient(0deg,rgba(8,29,55,.78),transparent 65%)}.scene-content{position:absolute;z-index:1;left:20px;right:15px;bottom:17px;color:#fff}.scene-content h3{font-size:20px;margin-bottom:5px}.scene-content p{color:#e1edf8;font-size:13px;line-height:1.55}.scene-label{display:inline-block;background:rgba(255,255,255,.18);padding:3px 8px;border-radius:5px;font-size:11px;margin-bottom:9px}
        .dark-section{background:#10243e;color:#fff}.dark-section p{color:#b5c8dd}.dark-section .eyebrow{color:#63d5dc}.case-grid{display:grid;grid-template-columns:1.35fr .65fr;gap:18px}.case-main,.case-side{border:1px solid #284565;border-radius:18px;padding:30px;background:#142e4d}.case-main{background-image:url('/assets/images/386806a1a634e556.webp');background-size:cover;background-blend-mode:soft-light}.case-main h3{font-size:26px;max-width:570px;margin:15px 0}.case-main p{max-width:580px}.audio-row{display:flex;align-items:center;gap:13px;padding-top:24px;margin-top:25px;border-top:1px solid #31516e}.audio-row .play{width:36px;height:36px}.audio-row strong{font-size:14px}.audio-row small{display:block;color:#91abc4}.case-side{display:flex;flex-direction:column;justify-content:center;gap:22px}.case-stat b{font-size:32px;color:#61d6dc;display:block}.case-stat span{font-size:13px;color:#b5c8dd}
        .stats{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}.stat{padding:25px 20px;border-left:3px solid var(--cyan)}.stat b{display:block;font-size:38px;color:var(--blue-dark);letter-spacing:-.05em}.stat span{font-size:14px;color:var(--muted)}
        .story-grid{display:grid;grid-template-columns:1.4fr .8fr;gap:18px}.story-main{background:#fff;border:1px solid var(--line);border-radius:18px;padding:34px;box-shadow:var(--shadow)}.story-main blockquote{font-size:23px;line-height:1.55;font-weight:700;margin:20px 0}.story-main .story-meta{color:var(--blue);font-size:14px}.story-side{display:grid;gap:18px}.story-mini{padding:24px;background:var(--pale);border-radius:15px}.story-mini h3{font-size:18px;margin:8px 0}.story-mini p{font-size:14px}
        .audience-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.audience{padding:25px;background:#fff;border:1px solid var(--line);border-radius:15px;display:flex;gap:15px;align-items:flex-start}.audience-icon{width:42px;height:42px;border-radius:12px;background:#e7f3ff;color:var(--blue);display:grid;place-items:center;font-size:20px;flex:0 0 auto}.audience h3{font-size:17px;margin-bottom:6px}.audience p{font-size:13px}
        .quote-list{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.quote{padding:28px;background:#fff;border:1px solid var(--line);border-radius:16px;position:relative}.quote:before{content:"“";font-size:60px;color:#cfe8fb;line-height:.7;display:block}.quote p{font-size:15px;color:var(--ink);margin:14px 0 20px}.quote small{color:var(--blue);font-weight:700}
        .news-list{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.news{background:#fff;border:1px solid var(--line);border-radius:15px;overflow:hidden;transition:.25s}.news:hover{transform:translateY(-4px);box-shadow:var(--shadow-hover)}.news img{height:145px;width:100%;object-fit:cover}.news-body{padding:20px}.news-meta{font-size:12px;color:var(--blue);display:flex;justify-content:space-between}.news h3{font-size:18px;margin:11px 0 8px}.news p{font-size:13px;line-height:1.65}
        .metric-layout{display:grid;grid-template-columns:.85fr 1.15fr;gap:50px;align-items:start}.metric-table{background:#fff;border:1px solid var(--line);border-radius:16px;overflow:hidden}.metric-row{display:grid;grid-template-columns:1fr 1fr;padding:17px 21px;border-bottom:1px solid var(--line);font-size:14px}.metric-row:last-child{border:0}.metric-row span{color:var(--muted)}.metric-row b{color:var(--ink)}.format-badges{display:flex;flex-wrap:wrap;gap:10px;margin-top:20px}.format-badges span{border:1px solid #b9d5ed;border-radius:8px;padding:8px 13px;color:var(--blue);background:#f8fcff;font-size:13px}
        .faq-list{max-width:850px;margin:0 auto;border-top:1px solid var(--line)}details{border-bottom:1px solid var(--line)}summary{list-style:none;cursor:pointer;padding:21px 5px;font-weight:700;display:flex;justify-content:space-between;gap:20px}summary::-webkit-details-marker{display:none}summary:after{content:"+";font-size:24px;color:var(--blue);font-weight:400}details[open] summary:after{content:"−"}details p{padding:0 35px 21px 5px;font-size:14px;line-height:1.8}
        .cta-section{background:#e8f5ff}.cta-layout{display:grid;grid-template-columns:.8fr 1.2fr;gap:65px;align-items:start}.cta-section h2{max-width:480px}.cta-section .section-head p{font-size:16px}.lead-form{background:#fff;border:1px solid #cfe3f2;border-radius:18px;padding:28px;box-shadow:var(--shadow)}.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}.field{display:flex;flex-direction:column;gap:7px}.field.full{grid-column:1/-1}.field label{font-size:13px;font-weight:700}.field input,.field textarea{border:1px solid #cbd9e7;border-radius:9px;padding:12px 13px;color:var(--ink);background:#fbfdff;min-height:46px}.field textarea{min-height:105px;resize:vertical}.field input:focus,.field textarea:focus{border-color:var(--blue);box-shadow:0 0 0 3px rgba(23,105,210,.1);outline:0}.form-note{font-size:12px;color:var(--muted);margin-top:12px}.form-message{display:none;padding:10px 12px;border-radius:8px;font-size:13px;margin-top:14px}.form-message.success{display:block;background:#eaf8f1;color:var(--success)}.form-message.error{display:block;background:#fff0f0;color:var(--error)}
        .footer{background:#0d2139;color:#b6c9dd;padding:54px 0 25px}.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:40px;padding-bottom:38px;border-bottom:1px solid #28415d}.footer .brand{color:#fff;margin-bottom:15px}.footer p,.footer a{font-size:13px;color:#aabed2}.footer h3{font-size:15px;color:#fff;margin-bottom:15px}.footer li{margin:8px 0}.footer a:hover{color:#fff}.copyright{display:flex;justify-content:space-between;gap:20px;padding-top:22px;font-size:12px;color:#8198af}
        @media(max-width:1024px){.hero-grid,.solution-grid,.metric-layout,.cta-layout{gap:35px}.ability-grid{grid-template-columns:1fr 1fr}.ability-card:nth-child(n){margin-top:0}.pain-list{grid-template-columns:repeat(2,1fr)}.pain-item:nth-child(2){border-right:0}.pain-item:nth-child(-n+2){border-bottom:1px solid var(--line)}.steps{grid-template-columns:repeat(5,1fr)}.scene-grid{grid-template-columns:1fr 1fr}.scene:first-child{grid-row:span 2}.stats{gap:10px}}
        @media(max-width:768px){.container{width:min(100% - 32px,600px)}.top-contact,.nav-row{display:none}.topbar{min-height:64px}.menu-toggle{display:block}.nav-row.open{display:block}.nav-inner{display:block}.nav-links{display:flex;flex-direction:column;align-items:stretch;gap:0;padding:8px 0 14px}.nav-links a{padding:10px 0}.nav-links a.active:after{display:none}.nav-inner .btn{display:none}.hero{padding:55px 0 62px}.hero-grid,.solution-grid,.metric-layout,.cta-layout,.case-grid,.story-grid{grid-template-columns:1fr}.hero-stage{min-height:390px}.hero h1{font-size:clamp(2.35rem,12vw,3.7rem)}.section{padding:70px 0}.section-head{margin-bottom:30px}.pain-list,.ability-grid,.audience-grid,.quote-list,.news-list{grid-template-columns:1fr}.pain-item{border-right:0!important;border-bottom:1px solid var(--line)}.pain-item:last-child{border-bottom:0}.steps{display:block}.steps:before{top:0;bottom:0;left:27px;width:2px;height:auto;right:auto}.step{display:grid;grid-template-columns:56px 1fr;text-align:left;gap:18px;padding:0 0 28px}.step-no{margin:0}.step h3{padding-top:7px}.step p{grid-column:2;margin-top:-22px}.scene-grid{display:flex;overflow-x:auto;padding-bottom:8px;scroll-snap-type:x mandatory}.scene{min-width:78%;height:240px;scroll-snap-align:start}.stats{grid-template-columns:1fr 1fr}.stat b{font-size:30px}.story-main blockquote{font-size:20px}.form-grid{grid-template-columns:1fr}.field.full{grid-column:auto}.footer-grid{grid-template-columns:1fr 1fr}.copyright{display:block}.copyright span{display:block;margin-top:8px}}
        @media(max-width:480px){.hero-actions .btn{width:100%}.hero-proof{gap:15px}.hero-stage{padding:10px}.hero-stage img{height:155px}.sliders{grid-template-columns:1fr}.case-main,.case-side,.story-main{padding:23px}.footer-grid{grid-template-columns:1fr}.section-head p{font-size:15px}.stats{gap:8px}.stat{padding:18px 11px}.stat b{font-size:25px}.stat span{font-size:12px}}