/* roulang page: index */
:root{
      --ink:#173c36;
      --ink-deep:#102e2a;
      --soil:#c8754e;
      --soil-dark:#a85b3d;
      --paper:#f7f5ef;
      --mist:#e9eee8;
      --line:#d8dfd7;
      --text:#20302c;
      --muted:#6f7e78;
      --white:#fffefa;
      --radius:14px;
      --shadow:0 14px 38px rgba(23,60,54,.10);
      --ease:all .28s ease;
    }
    *{box-sizing:border-box;margin:0;padding:0}
    html{scroll-behavior:smooth}
    body{font-family:"Noto Sans SC","Microsoft YaHei",Arial,sans-serif;background:var(--paper);color:var(--text);line-height:1.75;font-size:16px}
    img{display:block;max-width:100%;width:100%;object-fit:cover}
    a{color:inherit;text-decoration:none}
    button,input,select,textarea{font:inherit}
    button{cursor:pointer}
    :focus-visible{outline:3px solid rgba(200,117,78,.45);outline-offset:3px}
    .container{width:min(1200px,calc(100% - 48px));margin:0 auto}
    .site-header{height:78px;background:rgba(247,245,239,.96);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:20}
    .nav-wrap{height:78px;display:flex;align-items:center;justify-content:space-between;gap:28px}
    .brand{display:flex;align-items:center;gap:11px;min-width:max-content}
    .brand-mark{width:34px;height:34px;border:2px solid var(--soil);display:grid;place-items:center;color:var(--soil);font-weight:800;font-size:12px;letter-spacing:-1px;transform:rotate(45deg)}
    .brand-mark span{transform:rotate(-45deg)}
    .brand-text{font-size:19px;font-weight:800;letter-spacing:.02em;color:var(--ink)}
    .brand-text small{display:block;font-size:9px;line-height:1;color:var(--muted);font-weight:600;letter-spacing:.15em;margin-top:2px}
    .main-nav{display:flex;align-items:center;gap:32px}
    .main-nav a{font-size:14px;color:#52635d;padding:27px 2px 21px;border-bottom:2px solid transparent;transition:var(--ease)}
    .main-nav a:hover,.main-nav a.active{color:var(--ink);border-color:var(--soil)}
    .nav-contact{border:1px solid var(--ink)!important;padding:8px 16px!important;border-radius:5px;color:var(--ink)!important}
    .nav-contact:hover{background:var(--ink);color:var(--white)!important}
    .menu-toggle{display:none;background:none;border:0;color:var(--ink);font-size:25px}
    .hero{min-height:680px;display:flex;align-items:center;position:relative;overflow:hidden;background:var(--paper)}
    .hero:after{content:"";position:absolute;right:-10%;bottom:-35%;width:50%;height:70%;background:var(--mist);border-radius:50%;z-index:0}
    .hero-grid{display:grid;grid-template-columns:46% 54%;align-items:center;gap:58px;position:relative;z-index:1;padding:65px 0}
    .eyebrow,.section-kicker{display:flex;align-items:center;gap:10px;color:var(--soil-dark);font-size:12px;letter-spacing:.16em;font-weight:800;text-transform:uppercase}
    .eyebrow:before,.section-kicker:before{content:"";width:28px;height:2px;background:var(--soil)}
    h1{font-size:clamp(42px,5vw,72px);line-height:1.13;letter-spacing:-.06em;color:var(--ink-deep);margin:24px 0 25px;font-weight:850}
    .hero-copy p{max-width:520px;color:var(--muted);font-size:17px;line-height:1.9}
    .actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:34px}
    .btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;border-radius:6px;padding:13px 21px;border:1px solid transparent;font-weight:700;font-size:14px;transition:var(--ease)}
    .btn-primary{background:var(--soil);color:var(--white)}
    .btn-primary:hover{background:var(--soil-dark);transform:translateY(-2px);box-shadow:0 8px 18px rgba(168,91,61,.22)}
    .btn-outline{border-color:var(--ink);color:var(--ink);background:transparent}
    .btn-outline:hover{background:var(--ink);color:var(--white)}
    .hero-visual{position:relative;padding:18px 0 18px 34px}
    .hero-image{height:500px;border-radius:12px 0 12px 12px;box-shadow:var(--shadow);position:relative}
    .hero-image:after{content:"";position:absolute;inset:0;background:linear-gradient(135deg,rgba(16,46,42,.08),rgba(16,46,42,.38));border-radius:inherit}
    .hero-badge{position:absolute;left:0;bottom:54px;background:var(--soil);color:#fff;padding:18px 20px;width:165px;z-index:2}
    .hero-badge strong{display:block;font-size:22px;line-height:1.2}
    .hero-badge span{font-size:12px;opacity:.85}
    .index-strip{border-top:1px solid var(--line);display:flex;gap:28px;padding-top:18px;margin-top:45px;color:var(--muted);font-size:12px}
    .index-strip b{color:var(--ink);margin-right:5px}
    .section{padding:112px 0}
    .section-head{display:flex;justify-content:space-between;align-items:end;gap:30px;margin-bottom:42px}
    h2{font-size:clamp(30px,4vw,46px);line-height:1.25;color:var(--ink);letter-spacing:-.04em;margin-top:14px}
    .section-head p{max-width:400px;color:var(--muted);font-size:15px}
    .overview{background:var(--white)}
    .overview-grid{display:grid;grid-template-columns:1fr 1.25fr;gap:100px;align-items:start}
    .overview-intro p{color:var(--muted);max-width:390px;margin-top:20px}
    .overview-list{border-top:1px solid var(--line)}
    .overview-item{display:grid;grid-template-columns:55px 1fr 25px;gap:15px;align-items:center;padding:22px 0;border-bottom:1px solid var(--line);transition:var(--ease)}
    .overview-item:hover{padding-left:10px;background:#fbfaf6}
    .item-no{font-size:13px;color:var(--soil);font-weight:800}
    .overview-item h3{font-size:18px;color:var(--ink);margin-bottom:3px}
    .overview-item p{font-size:13px;color:var(--muted)}
    .arrow{color:var(--soil);font-size:22px;transition:var(--ease)}
    .overview-item:hover .arrow{transform:translateX(5px)}
    .topics{background:var(--mist)}
    .topic-layout{display:grid;grid-template-columns:1.35fr .85fr;gap:22px;align-items:stretch}
    .topic-main,.topic-side{position:relative;overflow:hidden;border-radius:var(--radius);min-height:355px;background:var(--ink)}
    .topic-main img,.topic-side img{height:100%;position:absolute;inset:0;opacity:.72;transition:var(--ease)}
    .topic-main:after,.topic-side:after{content:"";position:absolute;inset:0;background:linear-gradient(0deg,rgba(16,46,42,.9),rgba(16,46,42,.05))}
    .topic-main:hover img,.topic-side:hover img{opacity:.86;transform:scale(1.03)}
    .topic-content{position:absolute;bottom:0;left:0;right:0;padding:29px;color:var(--white);z-index:1}
    .topic-content .tag{color:#f3c5ad;border-color:rgba(243,197,173,.6)}
    .topic-content h3{font-size:28px;line-height:1.35;margin:12px 0 8px}
    .topic-content p{font-size:14px;color:rgba(255,255,255,.78)}
    .topic-side{min-height:168px;background:#234d45}
    .topic-side + .topic-side{margin-top:19px}
    .topic-side .topic-content{padding:22px}
    .topic-side h3{font-size:19px;margin:7px 0 3px}
    .tag{display:inline-block;border:1px solid var(--soil);color:var(--soil-dark);padding:3px 9px;border-radius:30px;font-size:11px;letter-spacing:.04em}
    .evidence{background:var(--paper)}
    .evidence-grid{display:grid;grid-template-columns:1fr 1fr;gap:70px;align-items:center}
    .evidence-panel{border-left:3px solid var(--soil);padding-left:28px}
    .evidence-panel h3{font-size:26px;color:var(--ink);margin-bottom:14px}
    .evidence-panel p{color:var(--muted)}
    .evidence-lines{display:grid;grid-template-columns:1fr 1fr;gap:13px;margin-top:28px}
    .evidence-lines div{background:var(--white);border:1px solid var(--line);padding:17px 18px}
    .evidence-lines strong{display:block;color:var(--ink);font-size:17px}
    .evidence-lines span{font-size:12px;color:var(--muted)}
    .process{border-top:1px solid var(--line);padding-top:24px}
    .process-item{display:flex;gap:18px;padding:16px 0;border-bottom:1px solid var(--line)}
    .process-item b{color:var(--soil);font-size:14px}
    .process-item span{font-size:14px;color:var(--ink)}
    .content-section{background:var(--white)}
    .content-grid{display:grid;grid-template-columns:1.3fr .7fr;gap:24px}
    .feature-content{border:1px solid var(--line);background:var(--paper);border-radius:var(--radius);overflow:hidden}
    .feature-content img{height:270px}
    .feature-body{padding:23px}
    .feature-body h3{font-size:23px;color:var(--ink);margin:12px 0 7px}
    .feature-body p,.small-content p{font-size:13px;color:var(--muted)}
    .small-list{display:grid;gap:14px}
    .small-content{display:grid;grid-template-columns:115px 1fr;gap:15px;border-bottom:1px solid var(--line);padding-bottom:14px}
    .small-content img{height:92px;border-radius:7px}
    .small-content h3{font-size:16px;color:var(--ink);line-height:1.45;margin:7px 0 4px}
    .faq{background:var(--paper)}
    .faq-wrap{max-width:900px;margin:0 auto}
    .faq-item{border-top:1px solid var(--line)}
    .faq-question{width:100%;display:flex;align-items:center;gap:18px;justify-content:space-between;background:none;border:0;text-align:left;padding:22px 0;color:var(--ink);font-weight:750;font-size:16px}
    .faq-question span:first-child{display:flex;gap:16px}
    .faq-no{color:var(--soil);font-size:13px}
    .faq-symbol{font-size:23px;font-weight:300;color:var(--soil);transition:var(--ease)}
    .faq-answer{display:none;color:var(--muted);font-size:14px;padding:0 45px 22px 37px}
    .faq-item.open .faq-answer{display:block}
    .faq-item.open .faq-symbol{transform:rotate(45deg)}
    .contact{padding:0 0 112px;background:var(--paper)}
    .contact-box{background:var(--ink);color:var(--white);border-radius:var(--radius);display:grid;grid-template-columns:.8fr 1.2fr;gap:65px;padding:55px 60px}
    .contact-box h2{color:var(--white);font-size:37px}
    .contact-box p{color:rgba(255,255,255,.7);margin-top:17px}
    .contact-note{margin-top:35px;border-left:2px solid var(--soil);padding-left:18px;color:#e4c0af!important;font-size:13px!important}
    .contact-form{display:grid;grid-template-columns:1fr 1fr;gap:15px}
    .field{display:flex;flex-direction:column;gap:6px}
    .field.full{grid-column:1/-1}
    .field label{font-size:13px;color:rgba(255,255,255,.78)}
    .field input,.field select,.field textarea{border:1px solid rgba(255,255,255,.22);background:rgba(255,255,255,.08);color:var(--white);border-radius:5px;padding:11px 13px;outline:none}
    .field option{color:var(--text)}
    .field input:focus,.field select:focus,.field textarea:focus{border-color:#e3a88c;background:rgba(255,255,255,.13)}
    .field textarea{min-height:100px;resize:vertical}
    .form-submit{grid-column:1/-1;justify-self:start;margin-top:4px}
    .site-footer{background:var(--ink-deep);color:var(--white);padding:54px 0 22px}
    .footer-top{display:grid;grid-template-columns:1.5fr 1fr 1fr;gap:50px;padding-bottom:48px;border-bottom:1px solid rgba(255,255,255,.14)}
    .footer-brand .brand-text{color:var(--white)}
    .footer-brand p{color:rgba(255,255,255,.57);font-size:13px;margin-top:18px;max-width:260px}
    .footer-col h3{font-size:13px;color:#dfab91;margin-bottom:16px}
    .footer-col a,.footer-col span{display:block;color:rgba(255,255,255,.63);font-size:13px;margin:8px 0;transition:var(--ease)}
    .footer-col a:hover{color:#fff;padding-left:4px}
    .footer-bottom{display:flex;justify-content:space-between;gap:20px;padding-top:19px;color:rgba(255,255,255,.43);font-size:12px}
    .to-top{color:#dfab91}
    @media(max-width:992px){
      .main-nav{gap:18px}.hero-grid{gap:30px}.overview-grid{gap:45px}.contact-box{gap:35px;padding:42px}
    }
    @media(max-width:768px){
      .container{width:min(100% - 34px,600px)}
      .site-header,.nav-wrap{height:68px}.menu-toggle{display:block}
      .main-nav{display:none;position:absolute;top:68px;left:0;right:0;background:var(--paper);border-bottom:1px solid var(--line);padding:12px 17px;flex-direction:column;align-items:stretch;gap:0;box-shadow:var(--shadow)}
      .main-nav.show{display:flex}.main-nav a{padding:12px 8px;border-bottom:1px solid var(--line)}.nav-contact{text-align:center;margin-top:8px}
      .hero{min-height:auto}.hero-grid,.overview-grid,.evidence-grid,.content-grid,.contact-box{grid-template-columns:1fr}
      .hero-grid{padding:65px 0 75px}.hero-visual{padding:10px 0 0}.hero-image{height:360px}.hero-badge{bottom:28px}
      .index-strip{gap:15px;flex-wrap:wrap;margin-top:30px}
      .section{padding:78px 0}.section-head{display:block;margin-bottom:28px}.section-head p{margin-top:16px}
      .topic-layout{grid-template-columns:1fr}.topic-main{min-height:330px}.topic-side{min-height:190px}
      .evidence-grid{gap:38px}.contact{padding-bottom:78px}.contact-box{padding:35px 25px}.contact-box h2{font-size:30px}
      .footer-top{grid-template-columns:1fr 1fr;gap:30px}.footer-brand{grid-column:1/-1}.footer-bottom{display:block}.footer-bottom span{display:block;margin-top:8px}
    }
    @media(max-width:480px){
      body{font-size:15px}.brand-text{font-size:16px}.brand-text small{font-size:8px}.brand-mark{width:29px;height:29px}
      h1{font-size:41px}.hero-copy p{font-size:15px}.hero-image{height:290px}
      .evidence-lines{grid-template-columns:1fr}.contact-form{grid-template-columns:1fr}.field.full,.form-submit{grid-column:auto}.form-submit{width:100%}
      .form-submit .btn{width:100%}.footer-top{grid-template-columns:1fr}
    }

/* roulang page: category1 */
:root{--ink:#13241f;--muted:#60756d;--brand:#21443a;--brand-2:#315f51;--accent:#c87442;--accent-dark:#a85c31;--paper:#f7f3ea;--soft:#eef2e9;--card:#fffdf8;--line:#d9dfd4;--shadow:0 18px 45px rgba(19,36,31,.10);--shadow-sm:0 8px 24px rgba(19,36,31,.08);--radius:16px;--radius-sm:10px;--max:1200px;--fast:.22s ease}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,'Segoe UI','PingFang SC','Hiragino Sans GB','Microsoft YaHei',Arial,sans-serif;background:var(--paper);color:var(--ink);line-height:1.72;font-size:16px}a{color:inherit;text-decoration:none;transition:color var(--fast),background var(--fast),border-color var(--fast),transform var(--fast)}img{display:block;max-width:100%;height:auto}button,input,select,textarea{font:inherit}button{cursor:pointer;border:0}.container{width:min(var(--max),calc(100% - 40px));margin:0 auto}.site-header{position:sticky;top:0;z-index:50;background:rgba(247,243,234,.94);backdrop-filter:blur(14px);border-bottom:1px solid rgba(33,68,58,.14)}.header-inner{height:78px;display:flex;align-items:center;justify-content:space-between;gap:28px}.brand{display:inline-flex;align-items:center;gap:12px;min-width:max-content}.brand-mark{width:42px;height:42px;border-radius:13px;background:var(--brand);color:#fff;display:grid;place-items:center;box-shadow:inset 0 0 0 1px rgba(255,255,255,.18)}.brand-mark span{font-weight:800;letter-spacing:.04em;font-size:14px}.brand-text{font-weight:800;font-size:20px;line-height:1.1;color:var(--brand);letter-spacing:.02em}.brand-text small{display:block;margin-top:4px;font-size:10px;font-weight:700;color:var(--muted);letter-spacing:.16em}.main-nav{display:flex;align-items:center;gap:6px}.main-nav a{position:relative;padding:10px 14px;border-radius:999px;color:#294a41;font-weight:700;font-size:15px}.main-nav a:hover{background:#ebe7dc;color:var(--brand)}.main-nav a.active{background:var(--brand);color:#fff}.main-nav a.active:after{content:'';position:absolute;left:18px;right:18px;bottom:-9px;height:3px;border-radius:8px;background:var(--accent)}.main-nav .nav-contact{border:1px solid rgba(200,116,66,.45);color:var(--accent-dark);background:#fff8f1}.main-nav .nav-contact:hover{background:var(--accent);border-color:var(--accent);color:#fff}.menu-check{display:none}.menu-toggle{display:none;width:42px;height:42px;border:1px solid var(--line);border-radius:12px;align-items:center;justify-content:center;background:#fff9f0;color:var(--brand);font-weight:900}.breadcrumb{padding:22px 0 0;color:var(--muted);font-size:14px}.breadcrumb a:hover{color:var(--accent-dark)}.page-hero{padding:34px 0 74px;position:relative;overflow:hidden}.page-hero:before{content:'';position:absolute;right:-160px;top:40px;width:420px;height:420px;border-radius:50%;background:rgba(200,116,66,.10);pointer-events:none}.hero-grid{position:relative;display:grid;grid-template-columns:1.05fr .95fr;gap:48px;align-items:stretch}.hero-copy{padding:30px 0}.eyebrow{display:inline-flex;align-items:center;gap:8px;padding:7px 12px;border:1px solid rgba(33,68,58,.16);border-radius:999px;background:#fffaf2;color:var(--brand);font-size:13px;font-weight:800}.eyebrow:before{content:'';width:8px;height:8px;border-radius:50%;background:var(--accent)}h1{margin:18px 0 18px;font-size:clamp(34px,5vw,58px);line-height:1.08;letter-spacing:-.03em;color:var(--brand)}.lead{margin:0;max-width:640px;color:#40554d;font-size:18px}.hero-actions{display:flex;gap:14px;flex-wrap:wrap;margin-top:30px}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:13px 20px;border-radius:12px;font-weight:800;border:1px solid transparent;min-height:48px}.btn-primary{background:var(--accent);color:#fff;box-shadow:0 12px 24px rgba(200,116,66,.22)}.btn-primary:hover{background:var(--accent-dark);transform:translateY(-2px)}.btn-secondary{background:#fffaf4;color:var(--brand);border-color:rgba(33,68,58,.2)}.btn-secondary:hover{border-color:var(--accent);color:var(--accent-dark);transform:translateY(-2px)}.hero-panel{background:var(--brand);border-radius:24px;overflow:hidden;box-shadow:var(--shadow);display:grid;grid-template-rows:1fr auto;min-height:410px}.hero-panel img{width:100%;height:290px;object-fit:cover;opacity:.92}.panel-index{padding:22px;background:linear-gradient(135deg,#21443a,#18332c);color:#eff7ef;display:grid;grid-template-columns:1fr 1fr;gap:14px}.panel-index strong{display:block;font-size:14px;color:#fff}.panel-index span{display:block;color:#cbd9d2;font-size:13px}.section{padding:72px 0}.section.alt{background:#eef2e9;border-top:1px solid rgba(33,68,58,.08);border-bottom:1px solid rgba(33,68,58,.08)}.section-head{display:flex;justify-content:space-between;gap:28px;align-items:end;margin-bottom:28px}.section-head h2{margin:0;color:var(--brand);font-size:clamp(26px,3vw,38px);line-height:1.18;letter-spacing:-.02em}.section-head p{margin:0;color:var(--muted);max-width:560px}.topic-tabs{display:flex;gap:10px;overflow:auto;padding-bottom:4px}.topic-tabs a{white-space:nowrap;padding:10px 14px;border:1px solid var(--line);border-radius:999px;background:#fffdf8;color:#3d554d;font-weight:800;font-size:14px}.topic-tabs a.active,.topic-tabs a:hover{background:var(--brand);border-color:var(--brand);color:#fff}.content-layout{display:grid;grid-template-columns:1.12fr .88fr;gap:26px;align-items:start}.feature-card,.list-card,.process-card,.faq-item,.contact-card{background:var(--card);border:1px solid rgba(33,68,58,.13);border-radius:var(--radius);box-shadow:var(--shadow-sm)}.feature-card{overflow:hidden}.feature-card .media{position:relative;aspect-ratio:16/9;background:#dfe5dc}.feature-card img{width:100%;height:100%;object-fit:cover}.feature-card .media:after{content:'';position:absolute;inset:0;background:linear-gradient(180deg,rgba(19,36,31,0),rgba(19,36,31,.34))}.feature-card .body{padding:26px}.tag{display:inline-flex;align-items:center;padding:5px 10px;border-radius:999px;background:#f3e4d8;color:#98542e;font-weight:900;font-size:12px;letter-spacing:.03em}.feature-card h3,.list-card h3,.process-card h3{margin:14px 0 10px;color:var(--brand);line-height:1.28}.feature-card h3{font-size:26px}.feature-card p,.list-card p,.process-card p{margin:0;color:var(--muted)}.read-link{display:inline-flex;margin-top:18px;color:var(--accent-dark);font-weight:900}.read-link:hover{transform:translateX(4px)}.side-list{display:grid;gap:16px}.list-card{display:grid;grid-template-columns:150px 1fr;gap:16px;padding:14px;transition:transform var(--fast),border-color var(--fast),box-shadow var(--fast)}.list-card:hover{transform:translateY(-3px);border-color:rgba(200,116,66,.55);box-shadow:var(--shadow)}.list-card img{width:150px;height:128px;object-fit:cover;border-radius:12px}.list-card h3{font-size:18px}.meta{display:flex;gap:10px;flex-wrap:wrap;margin-top:12px;color:#73857e;font-size:13px}.process-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}.process-card{padding:24px;position:relative;overflow:hidden}.process-card:before{content:attr(data-step);position:absolute;right:18px;top:10px;font-size:52px;line-height:1;font-weight:900;color:rgba(33,68,58,.08)}.process-card .icon{width:42px;height:42px;border-radius:13px;background:#f5e3d4;color:var(--accent-dark);display:grid;place-items:center;font-weight:900;margin-bottom:16px}.scene-strip{display:grid;grid-template-columns:1fr 1fr 1fr;gap:16px}.scene{padding:22px;border-radius:var(--radius);background:#fffdf8;border:1px solid var(--line);min-height:150px}.scene 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