/* roulang page: index */
:root{
      --walnut:#3B2A22;
      --walnut-deep:#2A1D18;
      --brass:#B0894F;
      --brass-soft:#C4A36A;
      --bg:#F4EFE8;
      --paper:#E7E0D6;
      --ink:#16110E;
      --cream:#F8F4EE;
      --text:#3B2A22;
      --muted:#6B5A4D;
      --line:rgba(59,42,34,.14);
      --sage:#7D8B78;
      --clay:#A65D46;
      --white:#FBF8F3;
      --radius:6px;
      --shadow:0 12px 28px rgba(22,17,14,.07);
      --ease:280ms ease;
      --header-top:42px;
      --header-main:76px;
    }
    *,*::before,*::after{box-sizing:border-box}
    html{scroll-behavior:smooth}
    html,body{margin:0;padding:0}
    body{
      font-family:"Noto Sans SC","Source Han Sans SC","PingFang SC","Microsoft YaHei",sans-serif;
      font-size:17px;line-height:1.8;color:var(--text);background:var(--bg);
      overflow-x:hidden;
    }
    img{max-width:100%;height:auto;display:block}
    a{color:inherit;text-decoration:none}
    button,input,select,textarea{font:inherit;color:inherit}
    button{cursor:pointer;border:0;background:none}
    h1,h2,h3,h4{font-family:"Noto Serif SC","Source Han Serif SC","Songti SC",serif;font-weight:700;line-height:1.25;letter-spacing:-.02em;margin:0}
    p{margin:0 0 1em}
    ul{margin:0;padding:0;list-style:none}
    :focus-visible{outline:2px solid var(--brass);outline-offset:3px}
    .container{width:min(1240px,calc(100% - 48px));margin:0 auto}
    .skip{position:absolute;left:-999px;top:0}
    .skip:focus{left:16px;top:16px;background:var(--white);padding:8px 12px;z-index:200}
    .btn{
      display:inline-flex;align-items:center;justify-content:center;gap:8px;
      min-height:48px;padding:0 22px;border-radius:4px;font-size:15px;font-weight:500;
      letter-spacing:.04em;transition:background var(--ease),color var(--ease),border-color var(--ease),transform var(--ease);
      position:relative;overflow:hidden;
    }
    .btn-primary{background:var(--walnut);color:#F7F1E8}
    .btn-primary:hover,.btn-primary:active{background:var(--walnut-deep)}
    .btn-ghost{border:1px solid var(--brass);color:var(--brass-soft);background:transparent}
    .btn-ghost::after{content:"";position:absolute;left:0;bottom:0;height:1px;width:0;background:var(--brass);transition:width var(--ease)}
    .btn-ghost:hover{background:rgba(176,137,79,.12);color:#E8D5B0}
    .btn-ghost:hover::after{width:100%}
    .btn-line{border:1px solid var(--brass);color:var(--walnut);background:transparent}
    .btn-line:hover{background:var(--walnut);color:#F7F1E8;border-color:var(--walnut)}
    .badge{
      display:inline-flex;align-items:center;gap:6px;padding:6px 12px;border:1px solid var(--line);
      border-radius:999px;font-size:12px;letter-spacing:.08em;color:var(--muted);background:rgba(255,255,255,.45)
    }
    .badge-sage{border-color:rgba(125,139,120,.35);color:#4F5D4C;background:rgba(125,139,120,.12)}
    .badge-clay{border-color:rgba(166,93,70,.3);color:var(--clay);background:rgba(166,93,70,.1)}
    .kicker{font-size:13px;letter-spacing:.18em;color:var(--brass);text-transform:none;margin-bottom:12px}
    .lead{font-size:16px;line-height:1.85;color:var(--muted);max-width:46em}
    .section{padding:112px 0}
    .section-paper{background:var(--paper)}
    .section-cream{background:var(--cream)}
    .section-head{margin-bottom:48px;max-width:760px}
    .section-head h2{font-size:clamp(28px,3.4vw,42px);margin-bottom:16px}
    header.site-header{position:sticky;top:0;z-index:80;background:rgba(244,239,232,.92);backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}
    .topbar{height:var(--header-top);display:flex;align-items:center;font-size:12px;color:var(--muted);border-bottom:1px solid var(--line)}
    .topbar .container{display:flex;justify-content:space-between;align-items:center;gap:16px}
    .topbar-left,.topbar-right{display:flex;align-items:center;gap:18px;flex-wrap:wrap}
    .topbar a{color:var(--muted)}
    .topbar a:hover{color:var(--walnut)}
    .top-cta{min-height:28px;padding:0 10px;border:1px solid var(--brass);color:var(--walnut);font-size:12px;border-radius:3px}
    .top-cta:hover{background:var(--walnut);color:#F7F1E8}
    .mainbar{height:var(--header-main);transition:height var(--ease)}
    .mainbar .container{height:100%;display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:24px}
    .logo{display:flex;align-items:center;gap:10px;min-height:44px}
    .logo-mark{width:28px;height:28px;border:1px solid var(--brass);display:grid;place-items:center;color:var(--brass);font-family:"Noto Serif SC",serif;font-size:14px}
    .logo-text{display:flex;flex-direction:column;line-height:1.15}
    .logo-text strong{font-family:"Noto Serif SC",serif;font-size:18px;font-weight:700}
    .logo-text span{font-size:11px;letter-spacing:.22em;color:var(--brass)}
    .nav-desktop{display:flex;justify-content:center;gap:4px}
    .nav-desktop a{position:relative;padding:10px 12px;font-size:14px;letter-spacing:.12em;color:var(--muted);min-height:44px;display:inline-flex;align-items:center}
    .nav-desktop a::after{content:"";position:absolute;left:12px;right:12px;bottom:6px;height:1px;background:var(--brass);transform:scaleX(0);transform-origin:left;transition:transform var(--ease)}
    .nav-desktop a:hover,.nav-desktop a.is-active{color:var(--walnut)}
    .nav-desktop a:hover::after,.nav-desktop a.is-active::after{transform:scaleX(1)}
    .header-cta{min-width:128px}
    .burger{display:none;width:44px;height:44px;align-items:center;justify-content:center;flex-direction:column;gap:5px}
    .burger span{display:block;width:18px;height:1.5px;background:var(--walnut)}
    header.is-compact .mainbar{height:62px}
    .drawer{position:fixed;inset:0 0 0 auto;width:min(86vw,360px);background:var(--ink);color:var(--white);transform:translateX(100%);transition:transform var(--ease);z-index:90;padding:88px 28px 32px;display:flex;flex-direction:column;gap:8px}
    .drawer.is-open{transform:none}
    .drawer a{min-height:48px;display:flex;align-items:center;border-bottom:1px solid rgba(247,241,232,.12);letter-spacing:.16em}
    .drawer-close{position:absolute;top:18px;right:18px;width:44px;height:44px;color:#F7F1E8}
    .backdrop{position:fixed;inset:0;background:rgba(22,17,14,.45);opacity:0;pointer-events:none;transition:opacity var(--ease);z-index:85}
    .backdrop.is-open{opacity:1;pointer-events:auto}
    .hero{position:relative;min-height:calc(100vh - var(--header-top) - var(--header-main));background:var(--ink);color:var(--white);overflow:hidden}
    .slides{position:absolute;inset:0}
    .slide{position:absolute;inset:0;opacity:0;transform:translateX(24px);transition:opacity 420ms ease,transform 420ms ease;pointer-events:none}
    .slide.is-active{opacity:1;transform:none;pointer-events:auto;z-index:1}
    .slide img{width:100%;height:100%;object-fit:cover;filter:saturate(.92) contrast(1.05)}
    .slide-mask{position:absolute;inset:0;background:linear-gradient(90deg,rgba(22,17,14,.78) 0%,rgba(22,17,14,.38) 48%,rgba(22,17,14,.18) 100%),linear-gradient(180deg,rgba(22,17,14,.15),rgba(22,17,14,.72) 100%)}
    .hero-copy{position:relative;z-index:2;width:min(1240px,calc(100% - 48px));margin:0 auto;padding:120px 0 108px}
    .hero h1{font-size:clamp(40px,6vw,70px);max-width:8.2em;margin:10px 0 18px;color:#F7F1E8}
    .hero .sub{font-size:18px;max-width:18em;color:#E7DCCB;margin-bottom:18px}
    .hero .intro{max-width:38em;font-size:16px;line-height:1.85;color:#D8CBB8;margin-bottom:28px}
    .hero-actions{display:flex;flex-wrap:wrap;gap:12px}
    .hero-ctrl{position:absolute;z-index:3;bottom:28px;left:50%;transform:translateX(-50%);display:flex;align-items:center;gap:16px;width:min(1240px,calc(100% - 48px));justify-content:space-between}
    .pager{display:flex;gap:8px}
    .pager button{width:28px;height:3px;background:rgba(247,241,232,.35);min-height:44px;padding-top:20px;background-clip:content-box}
    .pager button.is-active{background:var(--brass);background-clip:content-box}
    .arrows{display:flex;gap:8px}
    .arrows button{width:44px;height:44px;border:1px solid rgba(247,241,232,.35);color:#F7F1E8}
    .arrows button:hover{border-color:var(--brass);color:var(--brass)}
    .intro-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:56px;align-items:center}
    .media-frame{position:relative;overflow:hidden;border-radius:6px}
    .media-frame img{width:100%;height:100%;object-fit:cover;min-height:520px;transition:transform 420ms ease}
    .media-frame:hover img{transform:scale(1.03)}
    .caption{position:absolute;left:16px;bottom:16px;background:rgba(22,17,14,.72);color:#F7F1E8;font-size:12px;padding:8px 12px;letter-spacing:.08em}
    .spec-list{display:grid;gap:14px;margin:24px 0 28px}
    .spec-list li{padding-left:18px;position:relative;color:var(--muted)}
    .spec-list li::before{content:"";width:8px;height:1px;background:var(--brass);position:absolute;left:0;top:.85em}
    .chips{display:flex;flex-wrap:wrap;gap:8px}
    .split{display:grid;grid-template-columns:220px 1fr;gap:40px;align-items:start}
    .space-nav{position:sticky;top:132px;display:flex;flex-direction:column;gap:4px}
    .space-nav button{text-align:left;padding:12px 8px;min-height:44px;color:var(--muted);border-bottom:1px solid transparent;letter-spacing:.12em}
    .space-nav button.is-active{color:var(--walnut);border-bottom-color:var(--brass)}
    .space-panel{display:none;grid-template-columns:1.1fr .9fr;gap:32px;align-items:center;background:var(--white);padding:28px;border:1px solid var(--line);box-shadow:var(--shadow)}
    .space-panel.is-active{display:grid}
    .space-panel img{width:100%;height:360px;object-fit:cover;border-radius:4px}
    .space-panel ul{margin-top:16px}
    .space-panel li{position:relative;padding-left:16px;margin-bottom:8px;color:var(--muted)}
    .space-panel li::before{content:"—";position:absolute;left:0;color:var(--brass)}
    .adv-grid{display:grid;grid-template-columns:repeat(12,1fr);gap:18px}
    .adv-card{background:var(--white);border:1px solid var(--line);padding:28px 24px;border-radius:6px;transition:box-shadow var(--ease),border-color var(--ease)}
    .adv-card:hover{box-shadow:var(--shadow);border-color:rgba(176,137,79,.45)}
    .adv-wide{grid-column:span 6}
    .adv-sm{grid-column:span 3}
    .adv-icon{width:36px;height:36px;margin-bottom:16px;color:var(--brass)}
    .adv-card h3{font-size:22px;margin-bottom:10px}
    .adv-card p{font-size:15px;color:var(--muted);margin:0}
    .scene-mag{display:grid;grid-template-columns:1.4fr 1fr;grid-template-rows:auto auto;gap:16px}
    .scene-card{position:relative;overflow:hidden;min-height:220px;color:#F7F1E8}
    .scene-card.big{grid-row:span 2;min-height:520px}
    .scene-card img{width:100%;height:100%;object-fit:cover;position:absolute;inset:0;transition:transform 420ms ease}
    .scene-card:hover img{transform:scale(1.03)}
    .scene-card .txt{position:relative;z-index:1;height:100%;display:flex;flex-direction:column;justify-content:flex-end;padding:24px;background:linear-gradient(180deg,transparent,rgba(22,17,14,.72))}
    .scene-card h3{font-size:26px;margin-bottom:6px}
    .scene-track{display:none;gap:12px;overflow:auto;scroll-snap-type:x mandatory;padding-bottom:8px}
    .product-stage{display:grid;grid-template-columns:1.25fr .75fr;grid-template-rows:1fr 1fr;gap:18px}
    .product-card{background:var(--white);border:1px solid var(--line);overflow:hidden;display:flex;flex-direction:column}
    .product-card.main{grid-row:span 2}
    .product-card img{width:100%;height:240px;object-fit:cover;transition:transform 420ms ease}
    .product-card.main img{height:420px}
    .product-card:hover img{transform:scale(1.03)}
    .product-body{padding:22px}
    .product-body h3{font-size:24px;margin-bottom:8px}
    .specs{font-size:14px;color:var(--muted);margin-bottom:16px}
    .process{display:grid;grid-template-columns:1fr 1.15fr;gap:40px}
    .steps{display:grid;gap:0}
    .step{display:grid;grid-template-columns:56px 1fr;gap:12px;padding:16px 0;border-bottom:1px solid var(--line)}
    .step b{font-family:"Noto Serif SC",serif;font-size:28px;color:var(--brass)}
    .compare{position:relative;overflow:hidden;min-height:460px;border-radius:6px;user-select:none}
    .compare img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
    .compare .after{clip-path:inset(0 50% 0 0)}
    .compare-range{position:absolute;inset:0;width:100%;height:100%;opacity:0;cursor:ew-resize}
    .compare-bar{position:absolute;top:0;bottom:0;left:50%;width:2px;background:var(--brass);pointer-events:none}
    .thumbs{display:flex;gap:8px;margin-top:12px}
    .thumbs button{width:72px;height:52px;overflow:hidden;border:1px solid transparent;padding:0}
    .thumbs button.is-active{border-color:var(--brass)}
    .thumbs img{width:100%;height:100%;object-fit:cover}
    .dark{background:var(--ink);color:#F4EFE8;padding:112px 0}
    .dark-grid{display:grid;grid-template-columns:.9fr 1.1fr;gap:48px;align-items:center}
    .quote{font-size:clamp(32px,4vw,52px);line-height:1.3;max-width:8em}
    .case-list{display:grid;gap:14px}
    .case-item{display:grid;grid-template-columns:140px 1fr auto;gap:16px;align-items:center;padding:14px;border:1px solid rgba(247,241,232,.12);background:rgba(247,241,232,.03);cursor:pointer;text-align:left;color:#F4EFE8;width:100%}
    .case-item img{width:140px;height:88px;object-fit:cover}
    .case-item:hover,.case-item.is-active{border-color:var(--brass)}
    .case-meta{font-size:13px;color:#C9B9A4}
    .price-wrap{overflow:auto}
    .price-table{width:100%;border-collapse:collapse;min-width:760px;background:var(--white);border:1px solid var(--line)}
    .price-table th,.price-table td{padding:16px 18px;text-align:left;border-bottom:1px solid var(--line);vertical-align:top}
    .price-table th{font-family:"Noto Serif SC",serif;font-size:22px;font-weight:700}
    .price-table thead th:nth-child(3){box-shadow:inset 0 0 0 1px var(--brass);background:#F8F1E4}
    .price-table tbody td:nth-child(3){background:#FBF6EC;box-shadow:inset 0 0 0 1px rgba(176,137,79,.35)}
    .price-num{color:var(--brass);font-family:"Noto Serif SC",serif;font-size:28px}
    .story{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center;margin-bottom:72px}
    .story:nth-child(even){direction:rtl}
    .story:nth-child(even) > *{direction:ltr}
    .story img{width:100%;height:420px;object-fit:cover;border-radius:6px}
    .stats{background:var(--paper);padding:64px 0}
    .stats-row{display:grid;grid-template-columns:repeat(5,1fr);gap:12px;text-align:left}
    .stat b{display:block;font-family:"Noto Serif SC",serif;font-size:42px;line-height:1}
    .stat span{display:block;margin-top:8px;color:var(--muted);font-size:14px}
    .wall{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}
    .wall article{background:var(--white);border:1px solid var(--line);padding:18px;font-size:14px;line-height:1.7}
    .stars{color:var(--brass);letter-spacing:2px;font-size:12px;margin-bottom:8px}
    .who{margin-top:12px;color:var(--muted);font-size:12px}
    .timeline{display:grid;gap:0;border-left:1px solid var(--brass);margin-left:8px}
    .tl{padding:0 0 36px 28px;position:relative}
    .tl::before{content:"";width:9px;height:9px;border:1px solid var(--brass);background:var(--bg);position:absolute;left:-5px;top:8px;border-radius:50%}
    .tl time{display:block;font-size:12px;letter-spacing:.16em;color:var(--brass);margin-bottom:6px}
    .tl q{font-family:"Noto Serif SC",serif;font-size:24px;display:block;margin:0 0 10px}
    .news-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
    .news-card{background:var(--white);border:1px solid var(--line);display:flex;flex-direction:column}
    .news-card img{height:180px;width:100%;object-fit:cover}
    .news-card .pad{padding:18px}
    .news-card time{font-size:12px;color:var(--brass);letter-spacing:.12em}
    .faq-item{border-bottom:1px solid var(--line)}
    .faq-item button{width:100%;text-align:left;min-height:64px;display:flex;justify-content:space-between;gap:16px;padding:16px 0;font-size:18px;font-family:"Noto Serif SC",serif}
    .faq-item button[aria-expanded="true"]{color:var(--brass)}
    .faq-item .ans{max-height:0;overflow:hidden;transition:max-height 320ms ease}
    .faq-item .ans-inner{padding:0 0 20px 16px;border-left:1px solid var(--brass);color:var(--muted);font-size:15px}
    .cta-box{display:grid;grid-template-columns:1fr .85fr;gap:40px;background:var(--white);border:1px solid var(--line);padding:40px;box-shadow:var(--shadow)}
    form{display:grid;gap:14px}
    label{display:grid;gap:6px;font-size:14px}
    input,select{height:48px;padding:0 12px;border:1px solid var(--line);background:var(--cream);border-radius:4px}
    input:focus,select:focus{border-color:var(--brass);outline:none;background:#fff}
    input.is-error,select.is-error{border-color:var(--clay);background:#F8ECE8}
    .choice{display:flex;flex-wrap:wrap;gap:8px}
    .choice label{display:flex;align-items:center;gap:6px;min-height:44px;padding:0 12px;border:1px solid var(--line);border-radius:999px;cursor:pointer}
    .choice input{width:16px;height:16px;accent-color:var(--walnut)}
    .form-msg{font-size:14px;color:var(--sage);min-height:1.4em}
    .aside-contact{background:var(--ink);color:#F4EFE8;padding:32px}
    .aside-contact a{color:var(--brass-soft)}
    .aside-contact p{color:#D5C6B3}
    footer.site-footer{background:#241914;color:#E8DCCB;padding:72px 0 28px}
    .foot-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.1fr;gap:32px;margin-bottom:40px}
    .foot-grid h3{font-size:16px;margin-bottom:14px;color:#F7F1E8}
    .foot-grid a,.foot-grid p{color:#C9B9A4;font-size:14px}
    .foot-grid a{display:block;min-height:36px}
    .foot-grid a:hover{color:#F7F1E8}
    .legal{border-top:1px solid rgba(247,241,232,.12);padding-top:18px;font-size:12px;color:#A89886;display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap}
    .lightbox{position:fixed;inset:0;background:rgba(22,17,14,.86);display:none;align-items:center;justify-content:center;z-index:120;padding:24px}
    .lightbox.is-open{display:flex}
    .lightbox img{max-width:min(1100px,92vw);max-height:86vh;object-fit:contain}
    @media (max-width:1440px){
      .hero h1{font-size:60px}
    }
    @media (max-width:1024px){
      .nav-desktop,.header-cta{display:none}
      .burger{display:flex}
      .mainbar .container{grid-template-columns:auto 1fr auto}
      .intro-grid,.split,.process,.dark-grid,.cta-box,.product-stage{grid-template-columns:1fr}
      .product-card.main{grid-row:auto}
      .adv-wide,.adv-sm{grid-column:span 6}
      .stats-row{grid-template-columns:repeat(3,1fr);gap:24px}
      .wall,.news-grid{grid-template-columns:repeat(2,1fr)}
      .foot-grid{grid-template-columns:1fr 1fr}
      .space-nav{position:static;flex-direction:row;overflow:auto}
      .space-panel,.space-panel.is-active{grid-template-columns:1fr}
      .media-frame img,.story img{min-height:320px;height:360px}
    }
    @media (max-width:768px){
      .container,.hero-copy{width:min(100% - 32px,1240px)}
      .section,.dark{padding:64px 0}
      .topbar-left span:nth-child(2),.topbar-right a:last-child{display:none}
      .hero{min-height:92vh}
      .hero-copy{padding:72px 0 120px}
      .hero h1{font-size:40px}
      .scene-mag{display:none}
      .scene-track{display:flex}
      .scene-track .scene-card{min-width:82%;scroll-snap-align:start;min-height:280px}
      .adv-wide,.adv-sm{grid-column:span 12}
      .story,.story:nth-child(even){grid-template-columns:1fr;direction:ltr;margin-bottom:40px}
      .stats-row,.wall,.news-grid,.foot-grid{grid-template-columns:1fr 1fr}
      .cta-box{padding:22px}
      .compare{min-height:320px}
    }
    @media (max-width:520px){
      .stats-row,.wall,.news-grid,.foot-grid{grid-template-columns:1fr}
      .hero .sub{max-width:none}
      .btn{width:100%}
      .hero-actions{flex-direction:column}
      .legal{flex-direction:column}
    }
    @media (prefers-reduced-motion:reduce){
      html{scroll-behavior:auto}
      *,*::before,*::after{animation:none!important;transition:none!important}
      .slide{transform:none}
    }