/* roulang page: index */
:root{
  --ink:#171A1C;--carbon:#252729;--gray:#676965;--muted:#8B8D89;
  --paper:#F5F4F0;--mist:#E7E5DF;--white:#FFFDF9;--line:#D9D7D0;
  --amber:#E99A2E;--amber-dark:#C97918;--green:#718B68;--red:#B74C3A;
  --shadow:0 14px 35px rgba(23,26,28,.08);--shadow-lg:0 22px 48px rgba(23,26,28,.16);
  --radius:16px;--radius-sm:10px;--container:1240px;
}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--paper);color:var(--carbon);font-family:"PingFang SC","Microsoft YaHei","Noto Sans SC",Arial,sans-serif;font-size:16px;line-height:1.82;padding-bottom:72px}
a{color:inherit;text-decoration:none}img{max-width:100%;display:block}button,input,select{font:inherit}button{cursor:pointer;border:0}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid rgba(233,154,46,.55);outline-offset:3px}
.container{width:min(calc(100% - 48px),var(--container));margin:auto}.section{padding:104px 0;position:relative;overflow:hidden}.section-mist{background:var(--mist)}.section-dark{background:var(--ink);color:#F7F5EF}.eyebrow{display:flex;align-items:center;gap:9px;font-size:13px;letter-spacing:.1em;color:var(--amber);font-weight:700;text-transform:uppercase}.eyebrow:before{content:"";width:22px;height:2px;background:var(--amber)}h1,h2,h3,p{margin-top:0}h1{font-size:clamp(42px,5vw,60px);line-height:1.18;letter-spacing:-.045em;margin-bottom:22px}h2{font-size:clamp(30px,3.3vw,40px);line-height:1.28;letter-spacing:-.035em;margin:12px 0 18px}h3{font-size:21px;line-height:1.4;margin:0 0 10px}.lead{color:var(--gray);max-width:680px;font-size:17px;line-height:1.9}.dark-lead{color:#C9CBC4}.section-head{display:flex;justify-content:space-between;align-items:end;gap:30px;margin-bottom:46px}.section-head .lead{margin:0;max-width:570px}.pill,.tag{display:inline-flex;align-items:center;gap:6px;border-radius:999px;font-size:13px;line-height:1;padding:8px 11px;border:1px solid var(--line);background:var(--white);color:var(--gray)}.tag:before{content:"";width:6px;height:6px;border-radius:50%;background:var(--green)}.btn{min-height:48px;display:inline-flex;justify-content:center;align-items:center;gap:9px;padding:11px 20px;border-radius:9px;font-weight:700;transition:.22s ease}.btn-primary{background:var(--amber);color:var(--ink)}.btn-primary:hover{background:var(--amber-dark);transform:translateY(-2px);box-shadow:0 9px 20px rgba(233,154,46,.25)}.btn-dark{background:var(--ink);color:#fff}.btn-dark:hover{transform:translateY(-2px);background:#303438}.btn-outline{border:1px solid #8a8b86;color:var(--ink);background:transparent}.btn-outline:hover{border-color:var(--amber);color:var(--amber);transform:translateY(-2px)}
.topbar{background:var(--ink);color:#CFD0CA;font-size:13px}.topbar .container{min-height:35px;display:flex;justify-content:space-between;align-items:center;gap:20px}.trust{display:flex;gap:17px;align-items:center}.trust span:before{content:"✓";color:var(--amber);font-weight:800;margin-right:6px}.top-contact{color:#F6F5F0}
.header{position:sticky;top:0;z-index:30;background:rgba(255,253,249,.98);border-bottom:1px solid var(--line);transition:.2s}.header.scrolled{box-shadow:0 6px 20px rgba(23,26,28,.08)}.nav-wrap{min-height:76px;display:flex;align-items:center;justify-content:space-between;gap:22px}.logo{display:flex;align-items:center;gap:10px;font-weight:800;color:var(--ink);white-space:nowrap;letter-spacing:-.04em}.logo-mark{width:32px;height:32px;border:2px solid var(--ink);border-radius:50% 50% 9px 9px;position:relative}.logo-mark:before,.logo-mark:after{content:"";position:absolute;background:var(--amber)}.logo-mark:before{width:15px;height:2px;left:6px;top:9px}.logo-mark:after{width:9px;height:9px;border-radius:50%;left:10px;top:15px}.logo small{font-size:11px;color:var(--gray);font-weight:600;letter-spacing:0}.nav-links{display:flex;gap:23px;align-items:center}.nav-links a{font-size:14px;color:var(--gray);min-height:44px;display:flex;align-items:center;border-bottom:2px solid transparent;transition:.2s}.nav-links a:hover,.nav-links a.active{color:var(--ink);border-color:var(--amber)}.nav-cta{font-size:14px}.menu-btn{display:none;background:transparent;width:44px;height:44px;padding:8px}.menu-btn span{display:block;height:2px;background:var(--ink);margin:5px 0;transition:.2s}
.hero{min-height:650px;background:var(--ink);position:relative;color:#fff;overflow:hidden}.hero-slide{position:absolute;inset:0;opacity:0;transition:opacity .65s ease;background-size:cover;background-position:center}.hero-slide.active{opacity:1}.hero-slide:after{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(17,19,20,.91) 0%,rgba(17,19,20,.79) 44%,rgba(17,19,20,.22) 100%)}.hero-content{position:relative;z-index:2;min-height:650px;display:flex;align-items:center;padding:78px 0 108px}.hero-copy{max-width:725px}.hero p{color:#D6D7D1;max-width:710px;font-size:17px;line-height:1.95;margin-bottom:26px}.hero-tags{display:flex;flex-wrap:wrap;gap:9px;margin-bottom:26px}.hero-tags .pill{background:rgba(255,255,255,.08);border-color:rgba(255,255,255,.22);color:#F5F4F0}.hero-tags .pill:before{content:"";width:7px;height:7px;border-radius:50%;background:var(--amber)}.hero-actions{display:flex;flex-wrap:wrap;gap:12px}.hero .btn-outline{color:#fff;border-color:#B7B9B1}.hero-panel{position:absolute;right:max(24px,calc((100vw - var(--container))/2));bottom:30px;z-index:3;display:flex;align-items:center;gap:12px;background:rgba(23,26,28,.82);padding:10px 12px;border:1px solid rgba(255,255,255,.14);border-radius:10px}.slide-index{font-size:14px;color:#fff}.slide-index b{color:var(--amber);font-size:18px}.progress{width:74px;height:2px;background:#6C6E69}.progress i{display:block;width:33%;height:100%;background:var(--amber);transition:.4s}.slide-arrow{width:32px;height:32px;color:#fff;background:#343735;border-radius:6px;font-size:18px;transition:.2s}.slide-arrow:hover{background:var(--amber);color:var(--ink)}
.intro-grid{display:grid;grid-template-columns:1.08fr .92fr;gap:72px;align-items:center}.image-frame{position:relative}.image-frame img{height:480px;width:100%;object-fit:cover;border-radius:var(--radius)}.image-note{position:absolute;bottom:20px;right:-25px;background:var(--white);padding:16px 18px;border-radius:10px;box-shadow:var(--shadow);min-width:180px}.image-note strong{display:block;font-size:25px;color:var(--amber);line-height:1.1}.image-note span{font-size:13px;color:var(--gray)}.verify-line{display:flex;gap:14px;align-items:flex-start;margin:23px 0;padding:15px;border-left:3px solid var(--green);background:#EFF1EB;font-size:14px}.verify-line b{color:var(--green);white-space:nowrap}.system-flow{display:flex;align-items:center;flex-wrap:wrap;gap:8px;margin:22px 0}.flow-item{background:var(--mist);padding:9px 12px;border-radius:8px;font-size:13px;font-weight:700}.flow-arrow{color:var(--amber)}
.highlights{display:grid;grid-template-columns:repeat(3,1fr);border-top:1px solid var(--line);border-bottom:1px solid var(--line);margin-bottom:34px}.highlight{padding:22px 25px 22px 0;display:flex;gap:14px}.highlight:not(:first-child){padding-left:25px;border-left:1px solid var(--line)}.num{font-size:13px;color:var(--amber);font-weight:800}.highlight b{display:block;font-size:16px}.highlight span{font-size:13px;color:var(--gray)}.ability-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.ability{background:var(--white);border:1px solid var(--line);border-radius:14px;padding:24px;min-height:205px;transition:.25s}.ability:hover{transform:translateY(-4px);box-shadow:var(--shadow);border-color:var(--amber)}.ability-icon{width:44px;height:44px;border:1px solid var(--line);border-radius:10px;display:grid;place-items:center;color:var(--amber);font-size:21px;margin-bottom:28px}.ability p{font-size:14px;color:var(--gray);margin:0;line-height:1.75}
.products-layout{display:grid;grid-template-columns:1.35fr 1fr;gap:20px}.product-card{background:var(--white);border:1px solid var(--line);border-radius:var(--radius);padding:15px;display:flex;gap:18px;transition:.25s}.product-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg);border-color:var(--amber)}.product-main{grid-row:span 2;display:block}.product-card img{width:148px;height:155px;border-radius:11px;object-fit:cover}.product-main img{width:100%;height:245px;margin-bottom:20px}.product-info{flex:1}.product-info h3{font-size:20px}.product-info p{font-size:14px;color:var(--gray);margin:6px 0 12px;line-height:1.65}.specs{display:flex;flex-wrap:wrap;gap:6px;margin:10px 0 15px}.specs span{font-size:12px;padding:5px 7px;background:var(--mist);border-radius:5px}.text-link{font-size:14px;color:var(--amber);font-weight:700}.scene-layout{display:grid;grid-template-columns:280px 1fr;gap:22px}.scene-tabs{display:flex;flex-direction:column;gap:7px}.scene-tab{padding:17px;border:1px solid var(--line);background:transparent;text-align:left;border-radius:10px;color:var(--gray);transition:.2s}.scene-tab b{display:block;color:var(--carbon);font-size:16px}.scene-tab small{font-size:12px}.scene-tab.active,.scene-tab:hover{background:var(--white);border-color:var(--amber);box-shadow:var(--shadow)}.scene-stage{position:relative;min-height:415px;border-radius:var(--radius);overflow:hidden}.scene-stage img{width:100%;height:415px;object-fit:cover}.scene-overlay{position:absolute;left:0;right:0;bottom:0;padding:25px;background:linear-gradient(transparent,rgba(23,26,28,.92));color:#fff}.steps{display:flex;gap:8px;flex-wrap:wrap;margin-top:12px}.steps span{font-size:12px;border:1px solid rgba(255,255,255,.35);padding:6px 8px;border-radius:5px}
.case-grid{display:grid;grid-template-columns:.85fr 1.15fr;gap:80px;align-items:center}.case-code{font-size:13px;color:var(--amber);letter-spacing:.12em}.case-quote{font-size:clamp(29px,3vw,43px);line-height:1.35;letter-spacing:-.04em;margin:16px 0 22px}.case-list{padding:0;margin:0;list-style:none}.case-list li{padding:13px 0;border-bottom:1px solid #444743;color:#CFD0CA}.case-list li:before{content:"—";color:var(--amber);padding-right:10px}.risk-flow{border-left:1px solid #636660;padding-left:29px}.risk-flow div{position:relative;padding:0 0 32px}.risk-flow div:before{content:"";position:absolute;width:10px;height:10px;left:-35px;top:7px;border-radius:50%;background:var(--amber)}.risk-flow b{display:block;color:#fff}.risk-flow span{font-size:14px;color:#BDC0B9}.stories{display:grid;grid-template-columns:1fr 1fr;gap:25px}.story{display:grid;grid-template-columns:190px 1fr;gap:22px;padding:16px;background:var(--white);border:1px solid var(--line);border-radius:var(--radius)}.story img{height:230px;width:100%;object-fit:cover;border-radius:11px}.story p{font-size:16px;line-height:1.8;margin:18px 0;color:var(--gray)}.story-foot{font-size:13px;color:var(--green);font-weight:700}
.stats{padding:50px 0;background:#DCDAD3}.stat-grid{display:grid;grid-template-columns:repeat(4,1fr)}.stat{padding:8px 30px;border-left:1px solid #BFBDB5}.stat:first-child{border-left:0}.stat strong{display:block;font-size:42px;line-height:1;color:var(--ink);letter-spacing:-.06em}.stat strong em{font-size:20px;color:var(--amber);font-style:normal}.stat span{font-size:14px;font-weight:700}.stat small{display:block;color:var(--gray);font-size:12px;margin-top:5px}
.recognition{display:grid;grid-template-columns:290px 1fr;gap:40px;align-items:start}.neutral-marks{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin-top:28px}.neutral-marks span{height:40px;border:1px dashed #BDBCB5;border-radius:7px;display:grid;place-items:center;color:#999A95;font-size:12px}.review-track{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.review{padding:22px;background:var(--white);border:1px solid var(--line);border-radius:14px}.review:nth-child(2){transform:translateY(22px)}.review .tag{font-size:12px;padding:6px 8px}.review p{font-size:14px;color:var(--gray);margin:17px 0}.review b{font-size:14px}.rating{color:var(--amber);font-size:13px;letter-spacing:2px}
.compare-wrap{overflow:hidden;border:1px solid var(--line);border-radius:var(--radius);background:var(--white)}.compare-row{display:grid;grid-template-columns:1.1fr 1fr 1fr;border-bottom:1px solid var(--line)}.compare-row:last-child{border:0}.compare-row>*{padding:15px 18px;font-size:14px}.compare-row>*:not(:first-child){border-left:1px solid var(--line)}.compare-head{background:var(--ink);color:#fff;font-weight:700}.compare-head>*:nth-child(2){background:#343734}.check{color:var(--green);font-weight:800}.dash{color:#A3A49F}.evidence-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.evidence{background:var(--white);border:1px solid var(--line);border-radius:13px;padding:22px;position:relative;overflow:hidden}.evidence:after{content:"";position:absolute;right:-20px;bottom:-24px;width:90px;height:90px;border:1px solid var(--mist);transform:rotate(45deg)}.evidence time{font-size:12px;color:var(--muted)}.evidence h3{font-size:19px;margin:15px 0 11px}.evidence p{font-size:14px;color:var(--gray);margin-bottom:15px}.evidence label{font-size:12px;color:var(--green);font-weight:700}
.faq-layout{display:grid;grid-template-columns:.75fr 1.25fr;gap:70px}.faq-list{border-top:1px solid var(--line)}.faq-item{border-bottom:1px solid var(--line)}.faq-q{width:100%;min-height:64px;background:transparent;text-align:left;display:flex;align-items:center;justify-content:space-between;gap:15px;color:var(--carbon);font-weight:700;font-size:16px;padding:14px 0}.faq-q i{font-style:normal;color:var(--amber);font-size:26px;font-weight:400}.faq-a{display:none;padding:0 40px 18px 0;font-size:14px;color:var(--gray);line-height:1.85}.faq-item.open .faq-a{display:block}.faq-item.open .faq-q i{font-size:0}.faq-item.open .faq-q i:after{content:"−";font-size:26px}
.assurance-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:0;border-top:1px solid #C7CCC0;border-bottom:1px solid #C7CCC0}.assure{padding:24px 20px;border-left:1px solid #C7CCC0}.assure:first-child{border-left:0}.assure b{display:block;font-size:15px;margin-bottom:7px}.assure p{font-size:13px;color:var(--gray);margin:0}.assure .a-num{color:var(--green);font-size:12px;font-weight:800;margin-bottom:12px}
.contact-section{background:var(--ink);color:#fff}.contact-grid{display:grid;grid-template-columns:1fr .92fr;gap:76px;align-items:center}.contact-grid h2{margin-top:12px}.contact-grid p{color:#C9CBC4}.contact-tags{display:flex;flex-wrap:wrap;gap:8px}.contact-tags span{font-size:13px;border:1px solid #51544F;padding:7px 9px;border-radius:5px;color:#D9DBD4}.form{background:#F7F6F1;padding:25px;border-radius:14px;color:var(--carbon)}.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}.field{display:flex;flex-direction:column;gap:6px}.field.full{grid-column:span 2}.field label{font-size:13px;font-weight:700}.field label em{font-style:normal;color:var(--red)}.field input,.field select{width:100%;height:46px;padding:0 11px;border:1px solid #B7B7B0;border-radius:7px;background:#fff;color:var(--carbon)}.field input:focus,.field select:focus{outline:0;border-color:var(--amber);box-shadow:0 0 0 3px rgba(233,154,46,.19)}.form .btn{width:100%;margin-top:16px}.form-note{font-size:12px;color:var(--gray);margin:10px 0 0}.form-msg{display:none;margin-top:10px;padding:9px;border-radius:6px;background:#E6EEE3;color:#476141;font-size:13px}
.footer{background:#111315;color:#C1C3BD;padding:58px 0 26px}.footer-grid{display:grid;grid-template-columns:1.25fr .8fr 1fr .85fr;gap:32px;padding-bottom:35px;border-bottom:1px solid #353835}.footer .logo{color:#fff;margin-bottom:16px}.footer .logo-mark{border-color:#fff}.footer p,.footer li{font-size:13px;color:#AEB0AA}.footer h3{font-size:15px;color:#fff;margin-bottom:15px}.footer ul{padding:0;margin:0;list-style:none}.footer li{margin:8px 0}.footer a:hover{color:var(--amber)}.footer-bottom{padding-top:20px;display:flex;justify-content:space-between;gap:20px;font-size:12px;color:#8E908A}.fixed-bar{position:fixed;z-index:40;bottom:0;left:0;right:0;background:rgba(23,26,28,.97);border-top:1px solid #454843;color:#fff}.fixed-inner{min-height:64px;display:flex;align-items:center;justify-content:space-between;gap:18px}.fixed-inner p{margin:0;font-size:14px}.fixed-inner p b{color:var(--amber)}.fixed-actions{display:flex;gap:10px}.fixed-actions .btn{min-height:40px;padding:8px 15px;font-size:14px}
@media(max-width:1024px){.nav-links{gap:14px}.intro-grid,.case-grid,.contact-grid,.faq-layout{gap:40px}.stories{gap:16px}.story{grid-template-columns:145px 1fr}.ability-grid{gap:14px}.recognition{grid-template-columns:240px 1fr}}
@media(max-width:768px){body{padding-bottom:66px}.container{width:min(calc(100% - 32px),var(--container))}.section{padding:66px 0}.topbar .container{justify-content:center}.trust span:not(:first-child),.top-contact{display:none}.nav-wrap{min-height:65px}.menu-btn{display:block}.nav-cta{display:none}.nav-links{display:none;position:absolute;top:65px;left:0;right:0;background:var(--white);padding:11px 16px 16px;border-bottom:1px solid var(--line);box-shadow:var(--shadow);flex-direction:column;align-items:stretch;gap:0}.nav-links.open{display:flex}.nav-links a{padding:10px 5px;border-bottom:1px solid var(--mist)}.hero,.hero-content{min-height:610px}.hero-content{padding:60px 0 105px}.hero p{font-size:15px}.section-head{display:block;margin-bottom:30px}.section-head .lead{margin-top:10px}.intro-grid,.case-grid,.contact-grid,.faq-layout,.recognition{grid-template-columns:1fr}.image-frame img{height:320px}.image-note{right:12px;bottom:12px}.highlights{grid-template-columns:1fr}.highlight,.highlight:not(:first-child){padding:17px 0;border-left:0;border-top:1px solid var(--line)}.highlight:first-child{border-top:0}.ability-grid,.evidence-grid{grid-template-columns:repeat(2,1fr)}.products-layout{grid-template-columns:1fr}.product-main{grid-row:auto}.product-main img{height:210px}.scene-layout{grid-template-columns:1fr}.scene-tabs{display:grid;grid-template-columns:1fr 1fr}.scene-tab{padding:11px}.scene-stage,.scene-stage img{min-height:330px;height:330px}.stories{grid-template-columns:1fr}.story{grid-template-columns:135px 1fr}.stat-grid{grid-template-columns:1fr 1fr;gap:15px}.stat{border-left:0;padding:10px;border-bottom:1px solid #BFBDB5}.review-track{grid-template-columns:1fr}.review:nth-child(2){transform:none}.compare-wrap{overflow-x:auto}.compare-row{min-width:650px}.assurance-grid{grid-template-columns:1fr 1fr}.assure:nth-child(3){border-left:0;border-top:1px solid #C7CCC0}.assure:nth-child(4){border-top:1px solid #C7CCC0}.footer-grid{grid-template-columns:1fr 1fr}.footer-bottom{display:block}.footer-bottom span{display:block;margin:7px 0}}
@media(max-width:520px){h1{font-size:39px}.section{padding:58px 0}.logo{font-size:14px}.logo small{display:none}.hero p{font-size:14px}.hero-actions .btn{width:100%}.hero-panel{right:16px}.ability-grid,.evidence-grid{grid-template-columns:1fr}.product-card{display:block}.product-card img{width:100%;height:165px;margin-bottom:14px}.scene-tabs{grid-template-columns:1fr}.story{grid-template-columns:1fr}.story img{height:190px}.stat strong{font-size:34px}.form-grid{grid-template-columns:1fr}.field.full{grid-column:auto}.footer-grid{grid-template-columns:1fr}.fixed-inner p{display:none}.fixed-inner{justify-content:center}.fixed-actions{width:100%}.fixed-actions .btn{flex:1;padding:8px}.fixed-actions .btn-outline{color:#fff;border-color:#848782}.compare-row{min-width:620px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{animation-duration:.01ms!important;transition-duration:.01ms!important}}