/* roulang page: index */
:root {
  --carbon:#141812; --teabg:#F2EEE7; --carddark:#1E221C;
  --amber:#E8953C; --olive:#5A6B4A;
  --txt-light:#20241E; --txt-dark:#E8E4DB;
  --muted-light:#6B6F64; --muted-dark:#989B8F;
  --border-light:#D8D2C5; --border-dark:#33382E;
  --radius-lg:8px; --radius-sm:4px;
  --shadow-card:0 4px 12px rgba(20,24,18,.08);
  --font-sans:"PingFang SC","Microsoft YaHei","Noto Sans SC",sans-serif;
  --font-mono:"JetBrains Mono","SF Mono",Consolas,monospace;
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;scroll-padding-top:80px}
body{font-family:var(--font-sans);background:var(--teabg);color:var(--txt-light);line-height:1.75;font-size:15px;-webkit-font-smoothing:antialiased}
img{max-width:100%;display:block;height:auto}
a{color:inherit;text-decoration:none}
ul,ol{list-style:none}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer;border:none;background:none}
.container{max-width:1200px;margin:0 auto;padding:0 24px}
@media(max-width:768px){.container{padding:0 16px}}
.section{padding:80px 0}
@media(max-width:768px){.section{padding:56px 0}}
.section-dark{background:var(--carbon);color:var(--txt-dark)}
.section-light{background:var(--teabg);color:var(--txt-light)}
.sec-top{display:flex;align-items:baseline;gap:12px;margin-bottom:8px}
.sec-num{font-family:var(--font-mono);font-size:14px;color:var(--amber);letter-spacing:.08em}
.sec-title{font-size:30px;font-weight:700;line-height:1.35;margin-bottom:12px}
@media(max-width:768px){.sec-title{font-size:24px}}
.sec-sub{max-width:640px;margin-bottom:48px;color:var(--muted-light);font-size:15px;line-height:1.8}
.section-dark .sec-sub{color:var(--muted-dark)}
.btn{display:inline-flex;align-items:center;justify-content:center;min-height:44px;padding:0 26px;border-radius:4px;font-weight:600;font-size:15px;letter-spacing:.02em;transition:all .15s ease-out;border:1px solid transparent}
.btn-primary{background:var(--amber);color:#141812;font-weight:700}
.btn-primary:hover{background:#F0A54D;transform:translateY(-1px)}
.btn-primary:active{transform:translateY(1px)}
.btn-secondary{background:transparent;border:1px solid var(--olive);color:var(--txt-dark)}
.btn-secondary:hover{border-color:#8a9b73;background:rgba(255,255,255,.08)}
.btn-secondary:active{transform:translateY(1px)}
.btn-dark{background:transparent;border:1px solid var(--border-light);color:var(--txt-light)}
.btn-dark:hover{border-color:var(--olive);background:rgba(90,107,74,.08)}
.btn:focus-visible,.btn:focus{outline:2px solid rgba(232,149,60,.5);outline-offset:2px}

/* Header */
.site-header{position:fixed;top:0;left:0;right:0;z-index:100;background:rgba(20,24,18,.96);backdrop-filter:blur(8px);border-bottom:1px solid var(--border-dark);min-height:72px;transition:box-shadow .2s}
.site-header.scrolled{box-shadow:0 4px 20px rgba(0,0,0,.3)}
.header-inner{display:flex;align-items:center;justify-content:space-between;min-height:72px;gap:16px}
.brand{display:flex;align-items:center;gap:12px}
.brand-icon{width:40px;height:40px;display:flex;align-items:center;justify-content:center;background:var(--carddark);border:1px solid var(--olive);border-radius:4px;flex-shrink:0}
.brand-icon svg{width:24px;height:24px;stroke:var(--amber);fill:none}
.brand-text{line-height:1.2}
.brand-text strong{display:block;font-size:16px;font-weight:700;color:var(--txt-dark);letter-spacing:.02em;white-space:nowrap}
.brand-text span{display:block;font-size:11px;color:var(--muted-dark);letter-spacing:.12em;margin-top:2px;white-space:nowrap}
.nav-links{display:flex;align-items:center;gap:24px}
.nav-links a{color:var(--muted-dark);font-size:14px;font-weight:500;transition:color .15s;position:relative}
.nav-links a:hover{color:var(--amber)}
.nav-links a::after{content:'';position:absolute;left:0;bottom:-6px;width:0;height:2px;background:var(--amber);transition:width .2s}
.nav-links a:hover::after{width:100%}
.nav-right{display:flex;align-items:center;gap:14px}
.lang-switch{display:flex;align-items:center;border:1px solid var(--border-dark);border-radius:999px;overflow:hidden;height:32px}
.lang-switch button{height:100%;padding:0 10px;font-size:12px;font-family:var(--font-mono);color:var(--muted-dark);line-height:32px;transition:all .15s;border-right:1px solid var(--border-dark)}
.lang-switch button:last-child{border-right:none}
.lang-switch button.active{background:var(--amber);color:#141812;font-weight:700}
.lang-switch button:not(.active):hover{color:var(--txt-dark);background:rgba(255,255,255,.05)}
.header-cta.btn{min-height:40px;padding:0 20px;font-size:14px}
.burger{display:none;flex-direction:column;gap:5px;padding:8px;cursor:pointer}
.burger span{width:22px;height:2px;background:var(--txt-dark);transition:all .2s}
.mobile-menu{display:none;background:var(--carbon);border-top:1px solid var(--border-dark);padding:16px 24px 24px}
.mobile-menu.open{display:block}
.mobile-menu .nav-links{flex-direction:column;align-items:flex-start;gap:0}
.mobile-menu .nav-links a{display:block;padding:12px 0;font-size:15px;color:var(--txt-dark);border-bottom:1px solid rgba(255,255,255,.04);width:100%}
.mobile-menu .nav-links a:hover{color:var(--amber)}
.mobile-menu .lang-switch{margin:16px 0}
.mobile-menu .btn{width:100%;margin-bottom:8px}
@media(max-width:1024px){
  .nav-links.desktop{display:none}
  .nav-right .header-cta.desktop{display:none}
  .burger{display:flex}
}
@media(min-width:1025px){
  .burger{display:none}
  .mobile-menu{display:none!important}
}

/* Hero */
.hero{background:var(--carbon);color:var(--txt-dark);position:relative;overflow:hidden;padding:150px 0 80px}
.hero-bg{position:absolute;inset:0;background-image:url('/assets/images/backpic/back-1.jpg');background-size:cover;background-position:center;opacity:.25;z-index:0}
.hero-grid-overlay{position:absolute;inset:0;z-index:1;background-image:linear-gradient(rgba(255,255,255,.04) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.04) 1px,transparent 1px);background-size:24px 24px;pointer-events:none}
.hero::before{content:'';position:absolute;inset:0;background:linear-gradient(90deg,rgba(20,24,18,.95) 30%,rgba(20,24,18,.7) 60%,rgba(20,24,18,.5) 100%);z-index:1}
.hero-inner{position:relative;z-index:2}
.hero-badge{display:inline-flex;align-items:center;gap:8px;border:1px solid var(--olive);border-radius:999px;padding:6px 14px;font-family:var(--font-mono);font-size:12px;color:var(--muted-dark);background:rgba(20,24,18,.6);letter-spacing:.06em;margin-bottom:28px}
.hero-badge .dot{width:6px;height:6px;border-radius:50%;background:var(--amber);display:inline-block}
.hero h1{font-size:46px;font-weight:800;line-height:1.2;letter-spacing:.01em;margin-bottom:18px}
@media(max-width:768px){.hero h1{font-size:32px}}
.hero h1 .hl{color:var(--amber)}
.hero-sub{max-width:560px;font-size:17px;line-height:1.8;color:var(--muted-dark);margin-bottom:36px}
@media(max-width:768px){.hero-sub{font-size:15px}}
.hero-ctas{display:flex;align-items:center;gap:14px;flex-wrap:wrap;margin-bottom:56px}
@media(max-width:520px){.hero-ctas{flex-direction:column;align-items:stretch}}
.hero-data{display:flex;flex-wrap:wrap;gap:0;border-top:1px solid var(--border-dark);padding-top:24px;max-width:640px}
.hero-data-item{flex:1;min-width:140px;padding-right:24px;border-right:1px solid var(--border-dark);margin-right:24px}
.hero-data-item:last-child{border-right:none;margin-right:0}
@media(max-width:640px){.hero-data-item{margin-right:0;border-right:none;border-bottom:1px solid var(--border-dark);padding:12px 0}}
.hero-data-item .num{font-family:var(--font-mono);font-size:28px;font-weight:700;color:var(--amber);display:block;line-height:1.1}
.hero-data-item .label{font-size:13px;color:var(--muted-dark);margin-top:6px;letter-spacing:.02em}
.hero-coord{position:absolute;right:16px;top:100px;z-index:2;font-family:var(--font-mono);font-size:10px;color:rgba(255,255,255,.25);letter-spacing:.1em;writing-mode:vertical-rl}
@media(max-width:768px){.hero-coord{display:none}}

/* Service Cards */
.cards-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px}
@media(max-width:900px){.cards-grid{grid-template-columns:1fr}}
.service-card{background:var(--carddark);border-radius:8px;display:flex;align-items:stretch;overflow:hidden;position:relative;transition:transform .15s ease-out,border-color .15s;border:1px solid transparent}
.service-card:hover{transform:translateY(-4px);border-color:var(--olive)}
.service-card::before{content:'';width:4px;background:var(--amber);flex-shrink:0;transition:width .15s ease-out}
.service-card:hover::before{width:6px}
.service-card-inner{padding:28px 28px 20px;flex:1}
.service-card .skew-tag{position:absolute;top:0;right:0;background:var(--olive);color:var(--txt-dark);font-family:var(--font-mono);font-size:11px;padding:6px 12px 6px 16px;clip-path:polygon(0 0,100% 0,100% 100%,8px 100%);letter-spacing:.06em}
.service-card .code{font-family:var(--font-mono);font-size:12px;color:var(--amber);letter-spacing:.08em;display:block;margin-bottom:8px}
.service-card h3{font-size:18px;font-weight:600;color:var(--txt-dark);margin-bottom:12px;line-height:1.4}
.service-card ul li{font-size:14px;color:var(--muted-dark);padding:4px 0;display:flex;align-items:baseline;gap:8px}
.service-card ul li::before{content:'▸';color:var(--amber);font-size:11px;flex-shrink:0}
.service-card .card-img{margin-top:16px;border-radius:4px;overflow:hidden;aspect-ratio:16/8}
.service-card .card-img img{width:100%;height:100%;object-fit:cover}
@media(max-width:520px){.service-card-inner{padding:20px 16px 14px}}

/* Data Section */
.data-section{background:var(--carbon);color:var(--txt-dark);position:relative;overflow:hidden}
.data-section::before{content:'';position:absolute;inset:0;background-image:repeating-linear-gradient(0deg,transparent 0,transparent 2px,rgba(255,255,255,.02) 2px,rgba(255,255,255,.02) 4px);pointer-events:none}
.data-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:32px;position:relative;z-index:2}
@media(max-width:900px){.data-grid{grid-template-columns:1fr 1fr;gap:24px}}
@media(max-width:520px){.data-grid{grid-template-columns:1fr}}
.data-item{border-left:1px solid var(--border-dark);padding-left:20px}
.data-item .num{font-family:var(--font-mono);font-size:36px;font-weight:700;color:var(--amber);line-height:1;display:block}
.data-item .label{font-size:14px;color:var(--muted-dark);margin-top:10px;letter-spacing:.02em}
.data-item .bar{height:2px;background:var(--border-dark);margin-top:14px;position:relative;overflow:hidden}
.data-item .bar::after{content:'';position:absolute;left:0;top:0;bottom:0;width:72%;background:var(--olive)}
.data-item:nth-child(2) .bar::after{width:88%}
.data-item:nth-child(3) .bar::after{width:64%}
.data-item:nth-child(4) .bar::after{width:92%}

/* Case Cards */
.case-card{display:flex;align-items:stretch;background:var(--teabg);border:1px solid var(--border-light);border-radius:8px;overflow:hidden;margin-bottom:32px}
.case-card .case-img{flex:1;min-height:280px;overflow:hidden;background:var(--carddark)}
.case-card .case-img img{width:100%;height:100%;object-fit:cover}
.case-card .case-body{flex:1;padding:32px 36px;display:flex;flex-direction:column;justify-content:center}
.case-card .case-code{font-family:var(--font-mono);font-size:12px;color:var(--olive);letter-spacing:.1em;margin-bottom:8px}
.case-card h3{font-size:22px;font-weight:700;color:var(--txt-light);margin-bottom:10px}
.case-card p{font-size:15px;color:var(--muted-light);line-height:1.8;margin-bottom:16px}
.case-card .tags{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:20px}
.case-card .tag{display:inline-block;padding:4px 12px;border:1px solid var(--olive);border-radius:999px;background:rgba(90,107,74,.06);color:var(--txt-light);font-family:var(--font-mono);font-size:11px;letter-spacing:.04em}
.case-card .read{font-size:14px;font-weight:600;color:var(--olive);display:inline-flex;align-items:center;gap:6px;transition:gap .15s}
.case-card .read:hover{gap:10px;color:var(--amber)}
.case-card.flip .case-img{order:2}
.case-card.flip .case-body{order:1}
@media(max-width:820px){
  .case-card,.case-card.flip{flex-direction:column}
  .case-card .case-img,.case-card.flip .case-img{min-height:200px;order:0!important}
  .case-card.flip .case-body{order:1!important}
  .case-card .case-body{padding:24px 20px}
}

/* Plan Cards */
.plan-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;align-items:stretch}
@media(max-width:900px){.plan-grid{grid-template-columns:1fr;gap:20px}}
.plan-card{background:var(--carddark);border-radius:8px;padding:32px 26px;position:relative;display:flex;flex-direction:column;border:1px solid transparent;transition:transform .15s ease-out}
.plan-card:hover{transform:translateY(-4px)}
.plan-card .left-bar{position:absolute;left:-1px;top:16px;bottom:16px;width:4px;background:var(--olive);border-radius:2px}
.plan-card h3{font-size:18px;font-weight:700;color:var(--txt-dark);margin-bottom:8px}
.plan-card .desc{font-size:13px;color:var(--muted-dark);line-height:1.7;margin-bottom:20px;min-height:44px}
.plan-card ul{margin-bottom:24px;flex:1}
.plan-card ul li{font-size:14px;color:var(--txt-dark);padding:7px 0;display:flex;gap:10px;align-items:flex-start}
.plan-card ul li::before{content:'■';color:var(--amber);font-size:9px;margin-top:5px;flex-shrink:0}
.plan-card .btn{width:100%}
.plan-card.featured{background:var(--amber);color:#141812;transform:scale(1.03);box-shadow:0 0 24px rgba(232,149,60,.15);z-index:2}
@media(max-width:900px){.plan-card.featured{transform:none;order:-1}}
.plan-card.featured h3{color:#141812}
.plan-card.featured .desc{color:#4d3a23}
.plan-card.featured ul li{color:#141812}
.plan-card.featured ul li::before{color:#141812}
.plan-card.featured .left-bar{background:#141812}
.plan-card.featured .btn-primary{background:#141812;color:var(--amber);border-color:#141812}
.plan-card.featured .btn-primary:hover{background:#20241E}
.plan-ribbon{position:absolute;top:-10px;right:16px;background:#141812;color:var(--amber);font-family:var(--font-mono);font-size:11px;padding:4px 14px;border-radius:4px;letter-spacing:.08em;font-weight:700}
.plan-card.featured .plan-ribbon{background:#141812;color:var(--amber)}

/* News Area */
.news-wrap{display:grid;grid-template-columns:3fr 1fr;gap:40px}
@media(max-width:900px){.news-wrap{grid-template-columns:1fr;gap:32px}}
.news-list li{border-bottom:1px solid var(--border-light);padding:16px 0}
.news-list li:first-child{padding-top:0}
.news-list a{display:flex;justify-content:space-between;align-items:center;gap:16px;font-size:15px;font-weight:500;color:var(--txt-light);transition:color .15s}
.news-list a:hover{color:var(--olive)}
.news-list .date{font-family:var(--font-mono);font-size:12px;color:var(--muted-light);flex-shrink:0;border:1px solid var(--border-light);border-radius:4px;padding:2px 10px}
.news-list a:hover .date{color:var(--ambor);border-color:var(--olive)}
.side-panel{background:var(--teabg);border:1px solid var(--border-light);border-radius:8px;padding:24px}
.side-panel h4{font-size:15px;font-weight:700;color:var(--txt-light);margin-bottom:16px;position:relative;padding-left:14px}
.side-panel h4::before{content:'';position:absolute;left:0;top:2px;bottom:2px;width:3px;background:var(--amber)}
.side-panel ul li{margin-bottom:12px;padding-bottom:12px;border-bottom:1px dashed var(--border-light)}
.side-panel ul li:last-child{margin-bottom:0;padding-bottom:0;border-bottom:none}
.side-panel a{font-size:14px;color:var(--txt-light);line-height:1.6;transition:color .15s;display:block}
.side-panel a:hover{color:var(--olive)}
.side-panel .hot{display:inline-block;font-family:var(--font-mono);font-size:10px;color:var(--amber);margin-right:6px;letter-spacing:.04em}

/* FAQ */
.faq-list{max-width:860px;margin:0 auto}
.faq-item{border:1px solid var(--border-light);border-radius:8px;margin-bottom:14px;background:var(--teabg);overflow:hidden;transition:border-color .2s}
.faq-item.active{border-color:var(--olive)}
.faq-item .num{font-family:var(--font-mono);font-size:13px;color:var(--muted-light);min-width:32px;display:inline-block}
.faq-item.active .num{color:var(--amber);font-weight:700}
.faq-q{display:flex;align-items:center;gap:12px;padding:20px 24px 18px;font-size:16px;font-weight:600;color:var(--txt-light);text-align:left;width:100%;cursor:pointer;transition:background .15s}
.faq-q:hover{background:rgba(90,107,74,.05)}
.faq-icon{margin-left:auto;font-family:var(--font-mono);font-size:20px;color:var(--olive);line-height:1;transition:transform .2s;flex-shrink:0}
.faq-item.active .faq-icon{transform:rotate(45deg);color:var(--amber)}
.faq-a{max-height:0;overflow:hidden;transition:max-height .3s ease-out}
.faq-a-inner{padding:2px 24px 24px 68px;font-size:15px;line-height:1.75;color:var(--muted-light)}
.faq-item.active .faq-a{max-height:600px}
.faq-more{display:flex;align-items:center;justify-content:center;gap:12px;margin-top:28px;font-size:14px;color:var(--muted-light)}
.faq-more a{color:var(--olive);font-weight:600;transition:color .15s}
.faq-more a:hover{color:var(--amber)}

/* Assurance */
.assure-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
@media(max-width:900px){.assure-grid{grid-template-columns:1fr 1fr}}
@media(max-width:520px){.assure-grid{grid-template-columns:1fr}}
.assure-item{background:var(--teabg);border:1px solid var(--border-light);border-radius:8px;padding:24px;text-align:center}
.assure-item svg{width:36px;height:36px;stroke:var(--olive);fill:none;margin:0 auto 12px;display:block}
.assure-item h4{font-size:16px;font-weight:700;color:var(--txt-light);margin-bottom:6px}
.assure-item p{font-size:13px;color:var(--muted-light);line-height:1.7}

/* Contact */
.contact-section{background:var(--carddark);color:var(--txt-dark);position:relative;overflow:hidden}
.contact-section::after{content:'';position:absolute;right:-60px;bottom:-60px;width:200px;height:200px;background:var(--amber);opacity:.05;clip-path:polygon(100% 0,100% 100%,0 100%);pointer-events:none}
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:48px;position:relative;z-index:2}
@media(max-width:860px){.contact-grid{grid-template-columns:1fr;gap:32px}}
.contact-info-item{display:flex;gap:16px;align-items:flex-start;padding:14px 0}
.contact-info-item .icon{width:36px;height:36px;flex-shrink:0;background:var(--carbon);border:1px solid var(--border-dark);border-radius:4px;display:flex;align-items:center;justify-content:center}
.contact-info-item .icon svg{width:18px;height:18px;stroke:var(--amber);fill:none}
.contact-info-item .meta-ttl{font-size:13px;color:var(--muted-dark);margin-bottom:2px}
.contact-info-item .meta-desc{font-size:15px;color:var(--txt-dark);line-height:1.6}
.contact-form{display:flex;flex-direction:column;gap:16px}
.contact-form .field{}
.contact-form label{display:block;font-size:13px;color:var(--muted-dark);margin-bottom:6px}
.contact-form input,.contact-form select,.contact-form textarea{width:100%;min-height:44px;background:var(--carbon);border:1px solid var(--border-dark);border-radius:4px;padding:10px 14px;color:var(--txt-dark);font-size:14px;transition:border-color .15s,box-shadow .15s}
.contact-form input::placeholder,.contact-form textarea::placeholder{color:var(--muted-dark)}
.contact-form input:focus,.contact-form select:focus,.contact-form textarea:focus{outline:none;border-color:var(--amber);box-shadow:0 0 0 2px rgba(232,149,60,.15)}
.contact-form select{appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6' viewBox='0 0 10 6' fill='none'%3E%3Cpath d='M1 1l4 4 4-4' stroke='%23989B8F' stroke-width='1.5'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 14px center;padding-right:38px;cursor:pointer}
.contact-form textarea{min-height:110px;resize:vertical}
.form-foot{font-size:12px;color:var(--muted-dark)}

/* Footer */
.site-footer{background:var(--carbon);color:var(--txt-dark);border-top:2px solid var(--amber)}
.footer-top{display:grid;grid-template-columns:1.4fr 1fr .8fr;gap:40px;padding:56px 0 32px}
@media(max-width:900px){.footer-top{grid-template-columns:1fr;gap:32px}}
.footer-brand .brand-text strong{font-size:18px}
.footer-brand p{font-size:14px;color:var(--muted-dark);line-height:1.7;margin-top:14px;max-width:320px}
.footer-links h5{font-size:13px;color:var(--muted-dark);letter-spacing:.08em;margin-bottom:16px;font-weight:600}
.footer-links ul{display:flex;flex-wrap:wrap;gap:8px 24px}
.footer-links a{font-size:14px;color:var(--txt-dark);opacity:.8;transition:opacity .15s,color .15s}
.footer-links a:hover{color:var(--amber);opacity:1}
.footer-coord{font-family:var(--font-mono);font-size:11px;color:var(--muted-dark);text-align:right;padding-bottom:20px}
@media(max-width:900px){.footer-coord{text-align:left}}
.footer-bottom{border-top:1px solid var(--border-dark);padding:18px 0;display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:10px}
.footer-bottom p{font-size:13px;color:var(--muted-dark)}
@media(max-width:520px){.footer-bottom{flex-direction:column;text-align:center}}
.footer-disclaimer{font-size:12px;color:var(--muted-dark);text-align:center;padding:14px 0;background:rgba(0,0,0,.2)}

/* Focus visible global */
a:focus-visible,button:focus-visible{outline:2px solid rgba(232,149,60,.5);outline-offset:2px}
input:focus-visible,select:focus-visible,textarea:focus-visible{outline:none}