/* roulang page: index */
:root{
      --bg:#090b10;
      --bg-2:#0d1118;
      --panel:rgba(255,255,255,.06);
      --panel-strong:rgba(255,255,255,.09);
      --line:rgba(255,255,255,.10);
      --line-strong:rgba(255,255,255,.16);
      --text:#f3f4f6;
      --muted:#9ca3af;
      --accent:#ff7a18;
      --accent-2:#ffd84d;
      --good:#30d0a3;
      --radius:24px;
      --radius-sm:18px;
      --shadow:0 24px 80px rgba(0,0,0,.36);
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{
      margin:0;
      font-family:Inter,PingFang SC,Hiragino Sans GB,Microsoft YaHei,system-ui,-apple-system,BlinkMacSystemFont,sans-serif;
      background:
        radial-gradient(circle at top left, rgba(255,122,24,.18), transparent 24%),
        radial-gradient(circle at top right, rgba(255,216,77,.10), transparent 22%),
        linear-gradient(180deg, #0b0d12 0%, #090b10 46%, #0a0c11 100%);
      color:var(--text);
      text-rendering:optimizeLegibility;
      -webkit-font-smoothing:antialiased;
      overflow-x:hidden;
    }
    body::before{
      content:"";
      position:fixed;
      inset:0;
      pointer-events:none;
      background-image:linear-gradient(rgba(255,255,255,.025) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.02) 1px, transparent 1px);
      background-size:32px 32px;
      mask-image:linear-gradient(180deg, rgba(0,0,0,.42), rgba(0,0,0,0));
      opacity:.18;
      z-index:-1;
    }
    ::selection{background:rgba(255,122,24,.28);color:#fff}
    a{text-decoration:none}
    img{max-width:100%;display:block}
    button,input,textarea,select{font:inherit}
    section{scroll-margin-top:112px}
    .surface{
      background:linear-gradient(180deg, rgba(255,255,255,.08), rgba(255,255,255,.04));
      border:1px solid var(--line);
      border-radius:var(--radius);
      box-shadow:var(--shadow);
      backdrop-filter:blur(18px);
    }
    .surface-soft{
      background:linear-gradient(180deg, rgba(255,255,255,.06), rgba(255,255,255,.03));
      border:1px solid var(--line);
      border-radius:var(--radius-sm);
      backdrop-filter:blur(16px);
    }
    .edge-line{
      position:relative;
    }
    .edge-line::after{
      content:"";
      position:absolute;
      left:0;
      right:0;
      bottom:-1px;
      height:1px;
      background:linear-gradient(90deg, transparent, rgba(255,255,255,.12), transparent);
    }
    .nav-link,
    .chip-link,
    .soft-btn{
      transition:transform .22s ease, background-color .22s ease, border-color .22s ease, box-shadow .22s ease, color .22s ease;
    }
    .nav-link:hover,
    .chip-link:hover,
    .soft-btn:hover{
      transform:translateY(-1px);
      border-color:rgba(255,122,24,.35);
      box-shadow:0 12px 28px rgba(0,0,0,.22);
    }
    .nav-link.active{
      background:rgba(255,122,24,.16);
      border-color:rgba(255,122,24,.36);
      color:#fff;
    }
    .btn-primary{
      background:linear-gradient(135deg, var(--accent), var(--accent-2));
      color:#0b0d12;
      box-shadow:0 18px 36px rgba(255,122,24,.20);
    }
    .btn-primary:hover{
      transform:translateY(-1px);
      box-shadow:0 22px 42px rgba(255,122,24,.28);
    }
    .btn-ghost{
      background:rgba(255,255,255,.04);
      border:1px solid rgba(255,255,255,.12);
      color:#f8fafc;
    }
    .btn-ghost:hover{background:rgba(255,255,255,.08)}
    .tag{
      display:inline-flex;
      align-items:center;
      gap:.4rem;
      border:1px solid rgba(255,255,255,.12);
      border-radius:999px;
      padding:.4rem .75rem;
      color:#e5e7eb;
      background:rgba(255,255,255,.04);
      line-height:1;
    }
    .section-kicker{
      letter-spacing:.18em;
      text-transform:uppercase;
      color:#cbd5e1;
      font-size:.72rem;
    }
    .section-title{
      font-size:clamp(1.5rem,2.6vw,2.35rem);
      line-height:1.05;
      letter-spacing:-.04em;
      font-weight:900;
    }
    .section-desc{
      color:var(--muted);
      line-height:1.75;
      max-width:56rem;
    }
    .metric{
      background:linear-gradient(180deg, rgba(255,255,255,.07), rgba(255,255,255,.03));
      border:1px solid rgba(255,255,255,.10);
      border-radius:22px;
      padding:1rem;
    }
    .metric-value{
      font-size:clamp(1.25rem,2vw,1.8rem);
      line-height:1;
      font-weight:900;
      letter-spacing:-.04em;
    }
    .metric-label{
      color:var(--muted);
      font-size:.85rem;
      margin-top:.45rem;
    }
    .progress-track{
      height:12px;
      background:rgba(255,255,255,.08);
      border-radius:999px;
      border:1px solid rgba(255,255,255,.09);
      overflow:hidden;
    }
    .progress-bar{
      height:100%;
      background:linear-gradient(90deg, var(--accent), var(--accent-2));
      border-radius:inherit;
      box-shadow:0 0 26px rgba(255,122,24,.32);
    }
    .faq-item{
      background:rgba(255,255,255,.04);
      border:1px solid rgba(255,255,255,.10);
      border-radius:20px;
      overflow:hidden;
    }
    .faq-item summary{
      list-style:none;
      cursor:pointer;
    }
    .faq-item summary::-webkit-details-marker{display:none}
    .faq-item[open]{
      background:rgba(255,255,255,.06);
      border-color:rgba(255,122,24,.24);
    }
    .faq-item summary .arrow{
      transition:transform .22s ease;
    }
    .faq-item[open] summary .arrow{
      transform:rotate(180deg);
    }
    .mini-glow{
      background:
        linear-gradient(180deg, rgba(255,122,24,.18), rgba(255,255,255,.04)),
        radial-gradient(circle at top, rgba(255,216,77,.15), transparent 60%);
    }
    .timeline-dot{
      width:.9rem;
      height:.9rem;
      border-radius:999px;
      background:linear-gradient(135deg, var(--accent), var(--accent-2));
      box-shadow:0 0 0 6px rgba(255,122,24,.12);
      flex:none;
    }
    .timeline-line{
      position:absolute;
      left:.4rem;
      top:1rem;
      bottom:1rem;
      width:1px;
      background:linear-gradient(180deg, rgba(255,122,24,.55), rgba(255,255,255,.08));
    }
    .link-card{
      position:relative;
      overflow:hidden;
    }
    .link-card::before{
      content:"";
      position:absolute;
      inset:0;
      background:linear-gradient(135deg, rgba(255,122,24,.16), transparent 45%);
      opacity:0;
      transition:opacity .22s ease;
    }
    .link-card:hover::before{opacity:1}
    .chip-scroll{
      scrollbar-width:none;
      -ms-overflow-style:none;
    }
    .chip-scroll::-webkit-scrollbar{display:none}
    .scroll-top{
      position:fixed;
      right:1.1rem;
      bottom:6.4rem;
      z-index:55;
    }
    @media (max-width: 767px){
      .scroll-top{bottom:5.4rem}
    }

/* roulang page: category1 */
:root{
      --bg:#09090b;
      --panel:#111316;
      --panel-2:#16191e;
      --line:rgba(255,255,255,.08);
      --line-strong:rgba(255,255,255,.14);
      --text:#f5f7fb;
      --muted:#aab2c0;
      --accent:#ff7a18;
      --accent-2:#ffd84d;
      --shadow:0 18px 45px rgba(0,0,0,.28);
      --radius:24px;
    }
    html{scroll-behavior:smooth;}
    body{
      background:
        linear-gradient(180deg, rgba(255,255,255,.02), transparent 18%),
        linear-gradient(90deg, rgba(255,255,255,.025) 1px, transparent 1px),
        linear-gradient(rgba(255,255,255,.025) 1px, transparent 1px),
        var(--bg);
      background-size:auto, 100% 32px, 32px 100%, auto;
      color:var(--text);
    }
    body::before{
      content:"";
      position:fixed;
      inset:0;
      pointer-events:none;
      background:linear-gradient(180deg, rgba(255,122,24,.08), transparent 18%, transparent 80%, rgba(255,216,77,.04));
      opacity:.7;
      z-index:-1;
    }
    a{color:inherit;text-decoration:none}
    img{display:block;max-width:100%}
    button,input,textarea,select{font:inherit}
    ::selection{background:rgba(255,122,24,.25);color:#fff}
    .surface{
      background:linear-gradient(180deg, rgba(20,22,26,.96), rgba(13,14,17,.92));
      border:1px solid var(--line);
      box-shadow:var(--shadow), inset 0 1px 0 rgba(255,255,255,.04);
      backdrop-filter:blur(14px);
    }
    .surface-lite{
      background:rgba(255,255,255,.03);
      border:1px solid rgba(255,255,255,.06);
    }
    .nav-link,
    .chip,
    .btn-primary,
    .btn-secondary,
    .faq-item summary{
      transition:transform .22s ease, background-color .22s ease, border-color .22s ease, box-shadow .22s ease, color .22s ease;
    }
    .nav-link:hover,
    .chip:hover,
    .btn-primary:hover,
    .btn-secondary:hover,
    .faq-item summary:hover{
      transform:translateY(-1px);
    }
    .nav-link{
      background:rgba(255,255,255,.02);
      border:1px solid rgba(255,255,255,.1);
    }
    .nav-link:hover{
      border-color:rgba(255,122,24,.34);
      background:rgba(255,122,24,.08);
    }
    .nav-link.active{
      background:linear-gradient(180deg, rgba(255,122,24,.18), rgba(255,122,24,.08));
      border-color:rgba(255,122,24,.5);
      color:#fff;
    }
    .chip{
      display:inline-flex;
      align-items:center;
      gap:.5rem;
      border-radius:999px;
      border:1px solid rgba(255,255,255,.1);
      background:rgba(255,255,255,.03);
      color:#dbe3ef;
      padding:.7rem 1rem;
      white-space:nowrap;
    }
    .chip:hover{
      border-color:rgba(255,122,24,.28);
      background:rgba(255,122,24,.07);
    }
    .kicker{
      display:inline-flex;
      align-items:center;
      gap:.5rem;
      border-radius:999px;
      border:1px solid rgba(255,122,24,.28);
      background:rgba(255,122,24,.09);
      color:#ffe4d4;
      padding:.45rem .85rem;
      font-size:.78rem;
      font-weight:700;
    }
    .btn-primary{
      background:linear-gradient(135deg, #ff7a18 0%, #ff9b42 42%, #ffd84d 100%);
      color:#0b0b0b;
      box-shadow:0 16px 28px rgba(255,122,24,.25);
    }
    .btn-primary:hover{
      box-shadow:0 20px 36px rgba(255,122,24,.3);
    }
    .btn-secondary{
      color:#f5f7fb;
      border:1px solid rgba(255,255,255,.14);
      background:rgba(255,255,255,.03);
    }
    .btn-secondary:hover{
      border-color:rgba(255,122,24,.3);
      background:rgba(255,122,24,.06);
    }
    .stat{
      border-radius:20px;
      border:1px solid rgba(255,255,255,.08);
      background:rgba(255,255,255,.03);
    }
    .faq-item{
      border-radius:20px;
      border:1px solid rgba(255,255,255,.08);
      background:rgba(255,255,255,.025);
      overflow:hidden;
    }
    .faq-item[open]{
      border-color:rgba(255,122,24,.28);
      background:rgba(255,122,24,.05);
    }
    .faq-item summary{
      list-style:none;
      cursor:pointer;
    }
    .faq-item summary::-webkit-details-marker{display:none}
    .faq-item .arrow{transition:transform .25s ease}
    .faq-item[open] .arrow{transform:rotate(180deg)}
    .no-scrollbar::-webkit-scrollbar{display:none}
    .no-scrollbar{-ms-overflow-style:none;scrollbar-width:none}