/* roulang page: index */
:root{
      --bg:#0b0f14;
      --bg-soft:#111823;
      --bg-elev:#151e2a;
      --card:#121926;
      --card-2:#172131;
      --line:rgba(255,255,255,.08);
      --line-strong:rgba(255,255,255,.14);
      --text:#f4f7fb;
      --muted:#9aa6b2;
      --muted-2:#7c8795;
      --accent:#2de2c2;
      --accent-2:#8b5cf6;
      --amber:#ffbf5e;
      --danger:#ff6b7a;
      --shadow:0 16px 48px rgba(0,0,0,.28);
      --shadow-soft:0 10px 28px rgba(0,0,0,.18);
      --radius:18px;
      --radius-sm:14px;
      --radius-xs:10px;
      --container:1200px;
      --gap:24px;
      --header-h:76px;
      --transition:.24s ease;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{
      margin:0;
      font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans CJK SC",sans-serif;
      color:var(--text);
      background:
        radial-gradient(circle at top left, rgba(45,226,194,.09), transparent 28%),
        radial-gradient(circle at top right, rgba(139,92,246,.10), transparent 32%),
        linear-gradient(180deg, #0a0e13 0%, #0d1218 38%, #0a0e13 100%);
      line-height:1.7;
      overflow-x:hidden;
    }
    body::before{
      content:"";
      position:fixed;
      inset:0;
      pointer-events:none;
      background:
        linear-gradient(180deg, rgba(255,255,255,.02), transparent 20%),
        linear-gradient(90deg, rgba(255,255,255,.02) 1px, transparent 1px);
      background-size:100% 100%, 64px 64px;
      mask-image:linear-gradient(180deg, rgba(0,0,0,.25), transparent 70%);
      opacity:.42;
      z-index:-1;
    }
    a{color:inherit;text-decoration:none}
    img{max-width:100%;display:block}
    button,input,textarea,select{font:inherit}
    button{
      border:0;
      background:none;
      color:inherit;
      padding:0;
      cursor:pointer;
    }
    .container{
      width:min(var(--container), calc(100% - 32px));
      margin:0 auto;
    }
    .site-header{
      position:sticky;
      top:0;
      z-index:50;
      backdrop-filter:saturate(140%) blur(12px);
      background:rgba(10,14,19,.42);
      border-bottom:1px solid transparent;
      transition:background var(--transition), border-color var(--transition), box-shadow var(--transition);
    }
    .site-header.is-scrolled{
      background:rgba(9,12,17,.88);
      border-bottom-color:var(--line);
      box-shadow:0 10px 30px rgba(0,0,0,.18);
    }
    .nav-wrap{
      min-height:var(--header-h);
      display:flex;
      align-items:center;
      justify-content:space-between;
      gap:18px;
    }
    .brand{
      display:inline-flex;
      align-items:center;
      gap:12px;
      font-weight:800;
      letter-spacing:.2px;
      color:var(--text);
      min-width:0;
    }
    .brand-mark{
      width:42px;
      height:42px;
      border-radius:14px;
      display:grid;
      place-items:center;
      background:
        linear-gradient(135deg, rgba(45,226,194,.20), rgba(139,92,246,.20)),
        linear-gradient(180deg, #182231, #0f1620);
      border:1px solid rgba(255,255,255,.12);
      box-shadow:inset 0 1px 0 rgba(255,255,255,.06);
      color:var(--accent);
      font-size:.88rem;
      flex:0 0 auto;
    }
    .brand span:last-child{
      white-space:nowrap;
      overflow:hidden;
      text-overflow:ellipsis;
      max-width:min(100vw - 180px, 440px);
    }
    .site-nav{
      display:flex;
      align-items:center;
      gap:10px;
    }
    .nav-link{
      position:relative;
      display:inline-flex;
      align-items:center;
      justify-content:center;
      min-height:44px;
      padding:0 16px;
      border-radius:999px;
      color:var(--muted);
      border:1px solid transparent;
      transition:transform var(--transition), background var(--transition), color var(--transition), border-color var(--transition), box-shadow var(--transition);
    }
    .nav-link:hover,
    .nav-link:focus-visible{
      color:var(--text);
      background:rgba(255,255,255,.04);
      border-color:var(--line);
      transform:translateY(-1px);
      outline:none;
    }
    .nav-link.active{
      color:#03110e;
      background:linear-gradient(135deg, var(--accent), #8cf7e4);
      border-color:transparent;
      box-shadow:0 10px 22px rgba(45,226,194,.22);
    }
    .nav-toggle{
      display:none;
      width:44px;
      height:44px;
      border-radius:12px;
      align-items:center;
      justify-content:center;
      border:1px solid var(--line);
      background:rgba(255,255,255,.03);
      color:var(--text);
    }
    .nav-toggle:focus-visible,
    .btn:focus-visible,
    .chip:focus-visible,
    .card-link:focus-visible,
    summary:focus-visible{
      outline:2px solid rgba(45,226,194,.9);
      outline-offset:2px;
    }
    .hero{
      position:relative;
      padding:34px 0 30px;
      isolation:isolate;
    }
    .hero-shell{
      position:relative;
      overflow:hidden;
      border-bottom:1px solid var(--line);
      background:
        linear-gradient(180deg, rgba(5,9,13,.28), rgba(5,9,13,.76)),
        url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
    }
    .hero-shell::before{
      content:"";
      position:absolute;
      inset:0;
      background:linear-gradient(120deg, rgba(9,13,18,.88) 10%, rgba(9,13,18,.46) 58%, rgba(9,13,18,.82) 100%);
      z-index:-1;
    }
    .hero-grid{
      display:grid;
      grid-template-columns:1.15fr .85fr;
      gap:28px;
      align-items:center;
      min-height:calc(100vh - 110px);
      padding:28px 0 38px;
    }
    .eyebrow{
      display:inline-flex;
      align-items:center;
      gap:8px;
      padding:8px 12px;
      border-radius:999px;
      background:rgba(45,226,194,.09);
      border:1px solid rgba(45,226,194,.18);
      color:#bffbf1;
      font-size:.9rem;
      letter-spacing:.2px;
      margin-bottom:16px;
    }
    .hero h1{
      margin:0;
      font-size:clamp(2rem, 4.8vw, 4.4rem);
      line-height:1.08;
      letter-spacing:-.03em;
      max-width:12ch;
      text-wrap:balance;
    }
    .hero p{
      margin:18px 0 0;
      max-width:62ch;
      color:rgba(244,247,251,.84);
      font-size:1.03rem;
    }
    .hero-actions{
      display:flex;
      flex-wrap:wrap;
      gap:12px;
      margin-top:26px;
    }
    .btn{
      min-height:48px;
      padding:0 18px;
      border-radius:12px;
      display:inline-flex;
      align-items:center;
      justify-content:center;
      gap:8px;
      transition:transform var(--transition), background var(--transition), border-color var(--transition), box-shadow var(--transition), color var(--transition);
      border:1px solid transparent;
      font-weight:700;
    }
    .btn:hover{
      transform:translateY(-2px);
    }
    .btn-primary{
      background:linear-gradient(135deg, var(--accent), #8ef6e7);
      color:#03110e;
      box-shadow:0 14px 28px rgba(45,226,194,.18);
    }
    .btn-primary:hover{box-shadow:0 18px 34px rgba(45,226,194,.26)}
    .btn-secondary{
      background:rgba(255,255,255,.04);
      color:var(--text);
      border-color:var(--line);
    }
    .btn-secondary:hover{
      background:rgba(255,255,255,.06);
      border-color:var(--line-strong);
    }
    .chip-row{
      display:flex;
      flex-wrap:wrap;
      gap:10px;
      margin-top:22px;
    }
    .chip{
      display:inline-flex;
      align-items:center;
      gap:8px;
      min-height:38px;
      padding:0 14px;
      border-radius:999px;
      color:var(--text);
      background:rgba(255,255,255,.04);
      border:1px solid var(--line);
      transition:transform var(--transition), background var(--transition), border-color var(--transition);
      font-size:.92rem;
    }
    .chip:hover{
      transform:translateY(-1px);
      background:rgba(255,255,255,.06);
      border-color:rgba(45,226,194,.3);
    }
    .hero-panel{
      display:grid;
      gap:16px;
    }
    .hero-metric-grid{
      display:grid;
      grid-template-columns:repeat(2, minmax(0, 1fr));
      gap:14px;
    }
    .metric-card{
      padding:18px;
      border-radius:var(--radius);
      background:linear-gradient(180deg, rgba(255,255,255,.05), rgba(255,255,255,.03));
      border:1px solid var(--line);
      box-shadow:var(--shadow-soft);
      backdrop-filter:blur(8px);
    }
    .metric-card strong{
      display:block;
      font-size:1.9rem;
      line-height:1;
      margin-bottom:8px;
      letter-spacing:-.03em;
    }
    .metric-card span{
      color:var(--muted);
      font-size:.92rem;
    }
    .hero-spotlight{
      position:relative;
      border-radius:24px;
      overflow:hidden;
      min-height:310px;
      border:1px solid var(--line);
      background:linear-gradient(180deg, rgba(10,15,20,.08), rgba(10,15,20,.62));
      box-shadow:var(--shadow);
    }
    .hero-spotlight img{
      width:100%;
      height:100%;
      min-height:310px;
      object-fit:cover;
      transform:scale(1.03);
      filter:saturate(1.02) contrast(1.04);
    }
    .hero-spotlight::after{
      content:"";
      position:absolute;
      inset:0;
      background:linear-gradient(180deg, rgba(8,11,15,.08) 10%, rgba(8,11,15,.6) 70%, rgba(8,11,15,.92) 100%);
    }
    .spotlight-content{
      position:absolute;
      inset:auto 18px 18px 18px;
      z-index:1;
      display:grid;
      gap:8px;
    }
    .spotlight-title{
      font-size:1.35rem;
      font-weight:800;
      line-height:1.2;
      margin:0;
    }
    .spotlight-meta{
      display:flex;
      flex-wrap:wrap;
      gap:8px;
      color:#dfe7ee;
      font-size:.92rem;
    }
    .spotlight-badge{
      display:inline-flex;
      align-items:center;
      min-height:28px;
      padding:0 10px;
      border-radius:999px;
      background:rgba(11,15,20,.52);
      border:1px solid rgba(255,255,255,.16);
      backdrop-filter:blur(8px);
    }
    .section{
      padding:72px 0;
    }
    .section-head{
      display:flex;
      align-items:end;
      justify-content:space-between;
      gap:18px;
      margin-bottom:26px;
    }
    .section-head h2{
      margin:8px 0 0;
      font-size:clamp(1.55rem, 3vw, 2.4rem);
      line-height:1.15;
      letter-spacing:-.02em;
    }
    .section-head p{
      margin:0;
      color:var(--muted);
      max-width:60ch;
    }
    .section-kicker{
      color:var(--accent);
      font-weight:700;
      font-size:.92rem;
      letter-spacing:.16em;
      text-transform:uppercase;
    }
    .feature-grid{
      display:grid;
      grid-template-columns:1.25fr .75fr;
      gap:18px;
      align-items:stretch;
    }
    .feature-large,
    .feature-small{
      position:relative;
      overflow:hidden;
      border:1px solid var(--line);
      border-radius:24px;
      background:linear-gradient(180deg, rgba(255,255,255,.05), rgba(255,255,255,.025));
      box-shadow:var(--shadow-soft);
      transition:transform var(--transition), box-shadow var(--transition), border-color var(--transition);
    }
    .feature-large:hover,
    .feature-small:hover,
    .category-card:hover{
      transform:translateY(-3px);
      border-color:rgba(45,226,194,.22);
      box-shadow:0 20px 42px rgba(0,0,0,.24);
    }
    .feature-cover{
      position:relative;
      aspect-ratio:16/9;
      overflow:hidden;
    }
    .feature-cover img{
      width:100%;
      height:100%;
      object-fit:cover;
      transition:transform .42s ease;
    }
    .feature-large:hover .feature-cover img,
    .feature-small:hover .feature-cover img,
    .category-card:hover .card-media img{
      transform:scale(1.045);
    }
    .feature-cover::after,
    .card-media::after{
      content:"";
      position:absolute;
      inset:0;
      background:linear-gradient(180deg, rgba(9,13,18,.06), rgba(9,13,18,.78));
    }
    .feature-content{
      padding:22px;
      position:relative;
    }
    .tag-row{
      display:flex;
      flex-wrap:wrap;
      gap:8px;
      margin-bottom:12px;
    }
    .tag{
      display:inline-flex;
      align-items:center;
      min-height:28px;
      padding:0 10px;
      border-radius:999px;
      font-size:.82rem;
      letter-spacing:.02em;
      background:rgba(45,226,194,.1);
      border:1px solid rgba(45,226,194,.18);
      color:#c8fbf2;
    }
    .tag.alt{
      background:rgba(139,92,246,.12);
      border-color:rgba(139,92,246,.22);
      color:#e1d8ff;
    }
    .tag.warn{
      background:rgba(255,191,94,.12);
      border-color:rgba(255,191,94,.22);
      color:#ffe1b0;
    }
    .feature-content h3,
    .card-title{
      margin:0;
      font-size:1.22rem;
      line-height:1.3;
      letter-spacing:-.01em;
    }
    .feature-content p,
    .card-summary{
      margin:10px 0 0;
      color:var(--muted);
    }
    .meta-line{
      display:flex;
      flex-wrap:wrap;
      gap:12px;
      margin-top:16px;
      color:var(--muted-2);
      font-size:.92rem;
    }
    .stack{
      display:grid;
      gap:18px;
    }
    .feature-small .feature-content{
      padding:18px;
    }
    .list-mini{
      margin:14px 0 0;
      padding:0;
      list-style:none;
      display:grid;
      gap:8px;
    }
    .list-mini li{
      display:flex;
      align-items:flex-start;
      gap:10px;
      color:rgba(244,247,251,.82);
      font-size:.96rem;
    }
    .list-mini li::before{
      content:"";
      width:8px;
      height:8px;
      border-radius:999px;
      margin-top:.55rem;
      background:linear-gradient(135deg, var(--accent), var(--accent-2));
      box-shadow:0 0 0 4px rgba(45,226,194,.08);
      flex:0 0 auto;
    }
    .stats{
      display:grid;
      grid-template-columns:repeat(4, minmax(0,1fr));
      gap:16px;
    }
    .stat-card{
      position:relative;
      padding:22px;
      border-radius:var(--radius);
      background:linear-gradient(180deg, rgba(255,255,255,.05), rgba(255,255,255,.03));
      border:1px solid var(--line);
      box-shadow:var(--shadow-soft);
    }
    .stat-card strong{
      display:block;
      font-size:clamp(1.8rem, 3vw, 2.5rem);
      line-height:1;
      margin-bottom:10px;
      letter-spacing:-.03em;
    }
    .stat-card span{
      color:var(--muted);
      font-size:.95rem;
    }
    .stat-card::after{
      content:"";
      position:absolute;
      inset:auto 18px 18px auto;
      width:54px;
      height:54px;
      border-radius:16px;
      background:radial-gradient(circle, rgba(45,226,194,.22), transparent 70%);
      pointer-events:none;
    }
    .category-grid{
      display:grid;
      grid-template-columns:1fr;
      gap:18px;
    }
    .category-card{
      display:grid;
      grid-template-columns:280px 1fr;
      gap:18px;
      overflow:hidden;
      border-radius:24px;
      border:1px solid var(--line);
      background:linear-gradient(180deg, rgba(255,255,255,.05), rgba(255,255,255,.025));
      box-shadow:var(--shadow-soft);
      transition:transform var(--transition), box-shadow var(--transition), border-color var(--transition);
    }
    .card-media{
      position:relative;
      min-height:220px;
      overflow:hidden;
    }
    .card-media img{
      width:100%;
      height:100%;
      object-fit:cover;
      transition:transform .42s ease;
    }
    .card-body{
      padding:22px 22px 22px 0;
      display:flex;
      flex-direction:column;
      justify-content:center;
    }
    .card-body .card-summary{
      max-width:64ch;
    }
    .card-actions{
      display:flex;
      flex-wrap:wrap;
      gap:10px;
      margin-top:18px;
    }
    .action-link{
      display:inline-flex;
      align-items:center;
      min-height:42px;
      padding:0 14px;
      border-radius:12px;
      border:1px solid var(--line);
      background:rgba(255,255,255,.03);
      transition:transform var(--transition), background var(--transition), border-color var(--transition);
      color:var(--text);
    }
    .action-link:hover{
      transform:translateY(-2px);
      background:rgba(255,255,255,.06);
      border-color:rgba(45,226,194,.26);
    }
    .timeline{
      display:grid;
      grid-template-columns:repeat(4, minmax(0,1fr));
      gap:16px;
    }
    .timeline-card{
      position:relative;
      padding:20px;
      border-radius:var(--radius);
      background:linear-gradient(180deg, rgba(255,255,255,.05), rgba(255,255,255,.03));
      border:1px solid var(--line);
      box-shadow:var(--shadow-soft);
      min-height:180px;
    }
    .timeline-card .step{
      display:inline-flex;
      align-items:center;
      gap:8px;
      font-size:.86rem;
      color:#c5ffe7;
      margin-bottom:14px;
    }
    .timeline-card .step::before{
      content:"";
      width:10px;
      height:10px;
      border-radius:999px;
      background:linear-gradient(135deg, var(--accent), var(--accent-2));
      box-shadow:0 0 0 5px rgba(45,226,194,.08);
    }
    .timeline-card h3{
      margin:0;
      font-size:1.14rem;
      line-height:1.35;
    }
    .timeline-card p{
      margin:10px 0 0;
      color:var(--muted);
      font-size:.95rem;
    }
    .faq-grid{
      display:grid;
      gap:12px;
      max-width:920px;
    }
    details.faq{
      border:1px solid var(--line);
      border-radius:18px;
      background:linear-gradient(180deg, rgba(255,255,255,.04), rgba(255,255,255,.025));
      box-shadow:var(--shadow-soft);
      overflow:hidden;
    }
    details.faq[open]{
      border-color:rgba(45,226,194,.2);
    }
    details.faq summary{
      list-style:none;
      cursor:pointer;
      padding:18px 20px;
      display:flex;
      align-items:center;
      justify-content:space-between;
      gap:16px;
      font-weight:700;
      color:var(--text);
    }
    details.faq summary::-webkit-details-marker{display:none}
    details.faq summary::after{
      content:"+";
      display:inline-flex;
      align-items:center;
      justify-content:center;
      width:30px;
      height:30px;
      border-radius:999px;
      border:1px solid var(--line);
      color:var(--accent);
      flex:0 0 auto;
      transition:transform var(--transition), background var(--transition);
    }
    details.faq[open] summary::after{
      content:"–";
      background:rgba(45,226,194,.08);
    }
    .faq-content{
      padding:0 20px 18px;
      color:var(--muted);
    }
    .cta{
      position:relative;
      overflow:hidden;
      padding:0;
    }
    .cta-shell{
      position:relative;
      border-radius:28px;
      overflow:hidden;
      border:1px solid var(--line);
      background:
        linear-gradient(180deg, rgba(8,12,17,.18), rgba(8,12,17,.84)),
        url('/assets/images/backpic/back-3.webp') center/cover no-repeat;
      box-shadow:var(--shadow);
    }
    .cta-shell::after{
      content:"";
      position:absolute;
      inset:0;
      background:linear-gradient(90deg, rgba(9,13,18,.88), rgba(9,13,18,.54), rgba(9,13,18,.78));
      z-index:0;
    }
    .cta-inner{
      position:relative;
      z-index:1;
      display:grid;
      grid-template-columns:1.1fr .9fr;
      gap:18px;
      padding:34px;
      align-items:center;
    }
    .cta h2{
      margin:10px 0 0;
      font-size:clamp(1.6rem, 3vw, 2.6rem);
      line-height:1.15;
    }
    .cta p{
      margin:14px 0 0;
      color:rgba(244,247,251,.82);
      max-width:58ch;
    }
    .cta-list{
      display:grid;
      gap:12px;
      padding:0;
      margin:0;
      list-style:none;
    }
    .cta-list li{
      display:flex;
      align-items:flex-start;
      gap:10px;
      color:#e8f4f8;
    }
    .cta-list li::before{
      content:"";
      width:10px;
      height:10px;
      margin-top:.5rem;
      border-radius:999px;
      background:linear-gradient(135deg, var(--accent), var(--amber));
      box-shadow:0 0 0 5px rgba(45,226,194,.08);
      flex:0 0 auto;
    }
    .site-footer{
      margin-top:72px;
      border-top:1px solid var(--line);
      background:rgba(7,10,14,.9);
    }
    .footer-top{
      padding:40px 0 28px;
      display:grid;
      grid-template-columns:1.2fr .8fr .8fr 1fr;
      gap:20px;
    }
    .footer-col h3{
      margin:0 0 14px;
      font-size:1.04rem;
    }
    .footer-col p,
    .footer-col li{
      color:var(--muted);
      margin:0;
      font-size:.95rem;
    }
    .footer-links{
      margin:0;
      padding:0;
      list-style:none;
      display:grid;
      gap:10px;
    }
    .footer-links a{
      color:var(--muted);
      transition:color var(--transition), transform var(--transition);
      display:inline-flex;
      gap:8px;
      align-items:center;
    }
    .footer-links a:hover{
      color:var(--text);
      transform:translateX(2px);
    }
    .footer-bottom{
      padding:18px 0 28px;
      border-top:1px solid var(--line);
      display:flex;
      flex-wrap:wrap;
      justify-content:space-between;
      gap:12px;
      color:var(--muted-2);
      font-size:.9rem;
    }
    .note{
      padding:14px 16px;
      border-radius:16px;
      background:rgba(255,255,255,.035);
      border:1px solid var(--line);
      color:var(--muted);
      font-size:.92rem;
    }
    .section-divider{
      height:1px;
      background:linear-gradient(90deg, transparent, rgba(255,255,255,.1), transparent);
      margin:0 auto;
      width:min(100%, 1200px);
    }
    .subtle-bg{
      position:relative;
    }
    .subtle-bg::before{
      content:"";
      position:absolute;
      inset:0;
      background:
        radial-gradient(circle at 15% 20%, rgba(45,226,194,.06), transparent 24%),
        radial-gradient(circle at 82% 42%, rgba(139,92,246,.08), transparent 26%);
      pointer-events:none;
      z-index:-1;
    }
    .small{
      font-size:.9rem;
    }
    .muted{color:var(--muted)}
    .hidden-desktop{display:none}
    @media (max-width: 1180px){
      .hero-grid,
      .cta-inner{
        grid-template-columns:1fr;
      }
      .feature-grid{
        grid-template-columns:1fr;
      }
      .stats{
        grid-template-columns:repeat(2, minmax(0,1fr));
      }
      .timeline{
        grid-template-columns:repeat(2, minmax(0,1fr));
      }
      .footer-top{
        grid-template-columns:1fr 1fr;
      }
    }
    @media (max-width: 860px){
      .nav-toggle{display:inline-flex}
      .site-nav{
        position:absolute;
        top:calc(var(--header-h) - 6px);
        right:16px;
        left:16px;
        padding:14px;
        border-radius:18px;
        flex-direction:column;
        align-items:stretch;
        background:rgba(9,12,17,.96);
        border:1px solid var(--line);
        box-shadow:var(--shadow);
        transform-origin:top;
        transform:scaleY(.92);
        opacity:0;
        visibility:hidden;
        pointer-events:none;
        transition:opacity var(--transition), transform var(--transition), visibility var(--transition);
      }
      .site-nav.open{
        opacity:1;
        visibility:visible;
        pointer-events:auto;
        transform:scaleY(1);
      }
      .nav-link{
        width:100%;
        justify-content:flex-start;
      }
      .hero{
        padding-top:20px;
      }
      .hero-grid{
        min-height:auto;
        padding:12px 0 30px;
      }
      .hero h1{
        max-width:100%;
      }
      .section{
        padding:56px 0;
      }
      .section-head{
        flex-direction:column;
        align-items:flex-start;
      }
      .category-card{
        grid-template-columns:1fr;
      }
      .card-body{
        padding:0 18px 18px;
      }
      .timeline{
        grid-template-columns:1fr;
      }
      .footer-top{
        grid-template-columns:1fr;
      }
    }
    @media (max-width: 560px){
      .container{
        width:min(var(--container), calc(100% - 24px));
      }
      .nav-wrap{
        min-height:70px;
      }
      .brand span:last-child{
        max-width:calc(100vw - 140px);
      }
      .hero h1{
        font-size:clamp(1.8rem, 9vw, 2.5rem);
      }
      .hero p,
      .section-head p,
      .card-summary,
      .feature-content p,
      .cta p{
        font-size:.96rem;
      }
      .hero-metric-grid,
      .stats{
        grid-template-columns:1fr;
      }
      .hero-spotlight{
        min-height:260px;
      }
      .hero-spotlight img{
        min-height:260px;
      }
      .feature-content,
      .stat-card,
      .timeline-card,
      details.faq summary,
      .faq-content,
      .cta-inner{
        padding-left:16px;
        padding-right:16px;
      }
      .cta-inner{
        padding-top:22px;
        padding-bottom:22px;
      }
      .btn,
      .chip,
      .action-link{
        width:100%;
        justify-content:center;
      }
      .hero-actions{
        display:grid;
        grid-template-columns:1fr;
      }
      .card-actions{
        display:grid;
        grid-template-columns:1fr;
      }
      .footer-bottom{
        padding-bottom:22px;
      }
    }
    @media (prefers-reduced-motion: reduce){
      html{scroll-behavior:auto}
      *,*::before,*::after{
        animation:none !important;
        transition:none !important;
      }
    }

/* roulang page: category1 */
:root {
      --bg: #07090d;
      --bg-2: #0d1118;
      --panel: rgba(17, 23, 32, 0.88);
      --panel-2: rgba(22, 30, 42, 0.78);
      --text: #edf7f8;
      --muted: #9fb0b7;
      --soft: #6f8088;
      --line: rgba(198, 242, 244, 0.14);
      --line-strong: rgba(78, 230, 218, 0.35);
      --cyan: #4ee6da;
      --cyan-2: #2fc4bb;
      --purple: #8b5cf6;
      --amber: #f5b84b;
      --danger: #ff7a7a;
      --radius-sm: 10px;
      --radius: 16px;
      --radius-lg: 24px;
      --shadow: 0 22px 70px rgba(0, 0, 0, 0.36);
      --shadow-soft: 0 14px 40px rgba(0, 0, 0, 0.22);
      --container: 1180px;
      --gap: 24px;
    }

    * { 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;
      color: var(--text);
      background:
        radial-gradient(circle at 12% 8%, rgba(78, 230, 218, 0.16), transparent 32%),
        radial-gradient(circle at 84% 22%, rgba(139, 92, 246, 0.13), transparent 30%),
        linear-gradient(180deg, #07090d 0%, #0b1016 48%, #07090d 100%);
      line-height: 1.7;
      overflow-x: hidden;
    }
    a { color: inherit; text-decoration: none; }
    img { display: block; max-width: 100%; height: auto; }
    button, input { font: inherit; }
    button { cursor: pointer; border: 0; }
    :focus-visible { outline: 3px solid rgba(78, 230, 218, 0.55); outline-offset: 3px; }
    .container { width: min(var(--container), calc(100% - 40px)); margin: 0 auto; }
    .section { padding: 78px 0; position: relative; }
    .section-tight { padding: 54px 0; }
    .eyebrow {
      display: inline-flex; align-items: center; gap: 8px;
      padding: 7px 12px; border: 1px solid var(--line);
      border-radius: 999px; color: var(--cyan); background: rgba(78, 230, 218, 0.08);
      font-size: 13px; font-weight: 700; letter-spacing: .03em;
    }
    .eyebrow::before { content: ""; width: 7px; height: 7px; border-radius: 50%; background: var(--cyan); box-shadow: 0 0 18px var(--cyan); }
    h1, h2, h3 { margin: 0; line-height: 1.18; letter-spacing: -0.02em; }
    p { margin: 0; }
    .lead { color: #c4d3d8; font-size: 18px; max-width: 780px; }
    .muted { color: var(--muted); }

    .site-header {
      position: sticky; top: 0; z-index: 50;
      background: rgba(7, 9, 13, 0.78);
      border-bottom: 1px solid rgba(198, 242, 244, 0.10);
      backdrop-filter: blur(18px);
      transition: background .25s ease, box-shadow .25s ease;
    }
    .site-header.is-scrolled { background: rgba(7, 9, 13, 0.94); box-shadow: 0 12px 30px rgba(0,0,0,.22); }
    .nav-wrap { min-height: 74px; display: flex; align-items: center; justify-content: space-between; gap: 18px; }
    .brand { display: inline-flex; align-items: center; gap: 12px; font-weight: 800; color: var(--text); letter-spacing: -0.02em; }
    .brand-mark {
      width: 42px; height: 42px; border-radius: 14px;
      display: inline-grid; place-items: center;
      background: linear-gradient(135deg, var(--cyan), var(--purple));
      color: #061014; font-weight: 900; box-shadow: 0 0 0 1px rgba(255,255,255,.12), 0 16px 30px rgba(78,230,218,.18);
    }
    .site-nav { display: flex; align-items: center; gap: 8px; }
    .nav-link {
      padding: 10px 14px; border-radius: 12px; color: #b8c8cd; font-weight: 700; font-size: 14px;
      transition: color .2s ease, background .2s ease, transform .2s ease;
    }
    .nav-link:hover { color: var(--text); background: rgba(255,255,255,.06); transform: translateY(-1px); }
    .nav-link.active { color: #071014; background: var(--cyan); }
    .nav-toggle {
      display: none; color: var(--text); background: rgba(255,255,255,.07); border: 1px solid var(--line);
      border-radius: 12px; padding: 9px 13px; font-weight: 800;
    }

    .breadcrumb { padding-top: 30px; color: var(--muted); font-size: 14px; }
    .breadcrumb a { color: #c6d5da; transition: color .2s ease; }
    .breadcrumb a:hover { color: var(--cyan); }
    .breadcrumb span { margin: 0 8px; color: var(--soft); }

    .category-hero { padding: 42px 0 46px; }
    .hero-panel {
      position: relative; overflow: hidden; border-radius: var(--radius-lg); border: 1px solid var(--line);
      background-image: linear-gradient(90deg, rgba(7,9,13,.94) 0%, rgba(7,9,13,.72) 54%, rgba(7,9,13,.42) 100%), url('/assets/images/backpic/back-2.webp');
      background-size: cover; background-position: center;
      box-shadow: var(--shadow);
      padding: 46px;
    }
    .hero-panel::after {
      content: ""; position: absolute; inset: auto -80px -120px auto; width: 360px; height: 360px;
      background: radial-gradient(circle, rgba(78,230,218,.20), transparent 66%); pointer-events: none;
    }
    .hero-content { position: relative; z-index: 1; max-width: 820px; }
    .hero-content h1 { margin-top: 18px; font-size: clamp(34px, 5vw, 64px); max-width: 920px; }
    .hero-content .lead { margin-top: 20px; }
    .hero-actions { display: flex; flex-wrap: wrap; gap: 13px; margin-top: 30px; }
    .btn {
      display: inline-flex; align-items: center; justify-content: center; gap: 8px;
      min-height: 46px; padding: 12px 18px; border-radius: 13px; font-weight: 800;
      transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease, background .2s ease;
    }
    .btn-primary { background: var(--cyan); color: #061014; box-shadow: 0 16px 34px rgba(78,230,218,.18); }
    .btn-secondary { color: var(--text); border: 1px solid var(--line-strong); background: rgba(78,230,218,.07); }
    .btn:hover { transform: translateY(-2px); box-shadow: 0 20px 45px rgba(0,0,0,.28); }
    .btn-primary:hover { background: #69fff3; }
    .btn-secondary:hover { border-color: var(--cyan); background: rgba(78,230,218,.12); }
    .hero-metrics { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 14px; margin-top: 34px; }
    .metric {
      padding: 16px; border-radius: 16px; border: 1px solid var(--line); background: rgba(12, 17, 24, .72);
    }
    .metric strong { display: block; font-size: 28px; line-height: 1; color: var(--text); }
    .metric span { display: block; margin-top: 8px; color: var(--muted); font-size: 13px; }

    .filter-card {
      border: 1px solid var(--line); border-radius: var(--radius-lg); background: rgba(12, 17, 24, .76);
      padding: 20px; box-shadow: var(--shadow-soft);
    }
    .filter-top { display: flex; align-items: center; justify-content: space-between; gap: 18px; margin-bottom: 16px; }
    .filter-top h2 { font-size: 22px; }
    .search-box { position: relative; min-width: 280px; flex: 0 1 360px; }
    .search-box input {
      width: 100%; border: 1px solid var(--line); border-radius: 999px; background: rgba(255,255,255,.05);
      color: var(--text); padding: 12px 16px 12px 42px;
    }
    .search-box input::placeholder { color: #78878e; }
    .search-box::before { content: "⌕"; position: absolute; left: 16px; top: 50%; transform: translateY(-50%); color: var(--cyan); font-weight: 800; }
    .filters { display: flex; flex-wrap: wrap; gap: 10px; }
    .chip {
      display: inline-flex; align-items: center; gap: 8px; padding: 9px 13px; border-radius: 999px;
      border: 1px solid var(--line); background: rgba(255,255,255,.045); color: #c4d3d8; font-weight: 700; font-size: 13px;
      transition: background .2s ease, border-color .2s ease, color .2s ease;
    }
    .chip:hover, .chip.active { border-color: var(--line-strong); background: rgba(78,230,218,.12); color: var(--text); }

    .content-layout { display: grid; grid-template-columns: minmax(0, 1fr) 330px; gap: 24px; align-items: start; }
    .section-head { display: flex; justify-content: space-between; align-items: end; gap: 20px; margin-bottom: 22px; }
    .section-head h2 { font-size: clamp(26px, 3vw, 40px); }
    .section-head p { margin-top: 10px; color: var(--muted); max-width: 720px; }
    .topic-list { display: grid; gap: 18px; }
    .topic-card {
      display: grid; grid-template-columns: 250px minmax(0, 1fr); gap: 20px;
      border: 1px solid var(--line); border-radius: var(--radius-lg); background: var(--panel);
      overflow: hidden; box-shadow: var(--shadow-soft); transition: transform .22s ease, border-color .22s ease, box-shadow .22s ease;
    }
    .topic-card.featured { grid-template-columns: 330px minmax(0, 1fr); background: linear-gradient(135deg, rgba(78,230,218,.10), rgba(22,30,42,.86)); }
    .topic-card:hover { transform: translateY(-3px); border-color: var(--line-strong); box-shadow: var(--shadow); }
    .topic-media { position: relative; min-height: 190px; overflow: hidden; background: #111; }
    .topic-media img { width: 100%; height: 100%; object-fit: cover; transition: transform .35s ease; }
    .topic-card:hover .topic-media img { transform: scale(1.045); }
    .topic-media::after { content: ""; position: absolute; inset: 0; background: linear-gradient(180deg, transparent 35%, rgba(0,0,0,.76)); }
    .media-label { position: absolute; left: 14px; bottom: 14px; z-index: 1; color: #071014; background: var(--amber); border-radius: 999px; padding: 6px 10px; font-size: 12px; font-weight: 900; }
    .topic-body { padding: 22px 22px 22px 0; }
    .tags { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 12px; }
    .tag { display: inline-flex; padding: 5px 9px; border-radius: 999px; background: rgba(139,92,246,.14); color: #d9ccff; border: 1px solid rgba(139,92,246,.22); font-size: 12px; font-weight: 800; }
    .tag.green { background: rgba(78,230,218,.11); color: #b9fffb; border-color: rgba(78,230,218,.22); }
    .tag.amber { background: rgba(245,184,75,.12); color: #ffe0a3; border-color: rgba(245,184,75,.24); }
    .topic-body h3 { font-size: 24px; transition: color .2s ease; }
    .topic-card:hover h3 { color: var(--cyan); }
    .topic-body p { margin-top: 12px; color: #b5c5cb; }
    .meta-row { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 16px; color: var(--soft); font-size: 13px; }
    .mini-action { margin-top: 18px; display: inline-flex; color: var(--cyan); font-weight: 900; }

    .sidebar { position: sticky; top: 94px; display: grid; gap: 16px; }
    .side-card {
      border: 1px solid var(--line); border-radius: var(--radius); background: var(--panel-2); padding: 18px;
    }
    .side-card h3 { font-size: 18px; margin-bottom: 12px; }
    .side-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 10px; }
    .side-list li { display: flex; justify-content: space-between; gap: 14px; padding-bottom: 10px; border-bottom: 1px solid rgba(255,255,255,.07); color: #c5d2d6; }
    .side-list li:last-child { border-bottom: 0; padding-bottom: 0; }
    .side-list b { color: var(--cyan); font-weight: 900; }
    .keyword-cloud { display: flex; flex-wrap: wrap; gap: 8px; }
    .note {
      color: #d8c7a1; background: rgba(245,184,75,.10); border: 1px solid rgba(245,184,75,.22);
      padding: 13px; border-radius: 14px; font-size: 14px;
    }

    .process-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 16px; }
    .process-card {
      position: relative; padding: 22px; border-radius: var(--radius); border: 1px solid var(--line);
      background: rgba(255,255,255,.045); min-height: 190px; transition: transform .2s ease, border-color .2s ease, background .2s ease;
    }
    .process-card:hover { transform: translateY(-3px); border-color: var(--line-strong); background: rgba(78,230,218,.07); }
    .step { display: inline-grid; place-items: center; width: 34px; height: 34px; border-radius: 12px; background: rgba(78,230,218,.15); color: var(--cyan); font-weight: 900; margin-bottom: 18px; }
    .process-card h3 { font-size: 19px; }
    .process-card p { margin-top: 10px; color: var(--muted); font-size: 14px; }

    .recommend-wrap { display: grid; grid-template-columns: 1.2fr .8fr; gap: 20px; }
    .recommend-card {
      position: relative; overflow: hidden; min-height: 270px; border-radius: var(--radius-lg); border: 1px solid var(--line);
      background: var(--panel); box-shadow: var(--shadow-soft);
    }
    .recommend-card img { width: 100%; height: 100%; object-fit: cover; position: absolute; inset: 0; opacity: .62; }
    .recommend-card::after { content: ""; position: absolute; inset: 0; background: linear-gradient(180deg, rgba(7,9,13,.24), rgba(7,9,13,.92)); }
    .recommend-content { position: absolute; inset: auto 0 0 0; z-index: 1; padding: 24px; }
    .recommend-content h3 { font-size: 26px; }
    .recommend-content p { color: #c5d2d6; margin-top: 10px; }

    .faq-grid { display: grid; grid-template-columns: .82fr 1.18fr; gap: 28px; align-items: start; }
    .faq-list { display: grid; gap: 12px; }
    .faq-item { border: 1px solid var(--line); border-radius: 16px; background: rgba(255,255,255,.045); overflow: hidden; }
    .faq-q {
      width: 100%; display: flex; align-items: center; justify-content: space-between; gap: 16px;
      padding: 18px 20px; color: var(--text); background: transparent; text-align: left; font-weight: 900;
    }
    .faq-q span:last-child { color: var(--cyan); font-size: 20px; transition: transform .2s ease; }
    .faq-a { max-height: 0; overflow: hidden; transition: max-height .26s ease; }
    .faq-a p { padding: 0 20px 18px; color: var(--muted); }
    .faq-item.open { border-color: var(--line-strong); }
    .faq-item.open .faq-q span:last-child { transform: rotate(45deg); }
    .faq-item.open .faq-a { max-height: 160px; }

    .cta-band {
      position: relative; overflow: hidden; border-radius: var(--radius-lg); border: 1px solid var(--line-strong);
      background: linear-gradient(135deg, rgba(78,230,218,.16), rgba(139,92,246,.12)), url('/assets/images/backpic/back-3.webp') center/cover;
      padding: 34px; box-shadow: var(--shadow);
    }
    .cta-band::before { content: ""; position: absolute; inset: 0; background: rgba(7,9,13,.70); }
    .cta-inner { position: relative; z-index: 1; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
    .cta-inner h2 { font-size: clamp(26px, 3.2vw, 42px); }
    .cta-inner p { color: #c5d2d6; margin-top: 10px; max-width: 680px; }

    .site-footer { border-top: 1px solid var(--line); background: #06080b; padding: 54px 0 24px; }
    .footer-top { display: grid; grid-template-columns: 1.35fr .8fr 1fr 1fr; gap: 28px; }
    .footer-col h3 { font-size: 17px; margin-bottom: 12px; }
    .footer-col p { color: var(--muted); }
    .footer-links { list-style: none; margin: 0; padding: 0; display: grid; gap: 9px; }
    .footer-links a, .footer-links span { color: var(--muted); transition: color .2s ease; }
    .footer-links a:hover { color: var(--cyan); }
    .footer-bottom { display: flex; justify-content: space-between; gap: 20px; color: #77868d; border-top: 1px solid rgba(255,255,255,.07); margin-top: 34px; padding-top: 20px; font-size: 13px; }

    @media (max-width: 1024px) {
      .content-layout { grid-template-columns: 1fr; }
      .sidebar { position: static; grid-template-columns: repeat(2, minmax(0, 1fr)); }
      .process-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
      .faq-grid, .recommend-wrap { grid-template-columns: 1fr; }
      .footer-top { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    }
    @media (max-width: 768px) {
      .container { width: min(100% - 28px, var(--container)); }
      .nav-toggle { display: inline-flex; }
      .site-nav {
        position: absolute; left: 14px; right: 14px; top: 68px; display: none; flex-direction: column; align-items: stretch;
        background: rgba(7,9,13,.96); border: 1px solid var(--line); border-radius: 16px; padding: 10px; box-shadow: var(--shadow);
      }
      .site-nav.open { display: flex; }
      .nav-link { text-align: center; }
      .brand span:last-child { max-width: 210px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
      .hero-panel { padding: 30px 22px; }
      .hero-metrics { grid-template-columns: repeat(2, minmax(0, 1fr)); }
      .filter-top { flex-direction: column; align-items: stretch; }
      .search-box { min-width: 0; flex: 1; }
      .topic-card, .topic-card.featured { grid-template-columns: 1fr; }
      .topic-media { min-height: 210px; }
      .topic-body { padding: 20px; }
      .sidebar { grid-template-columns: 1fr; }
      .cta-inner { flex-direction: column; align-items: flex-start; }
      .footer-bottom { flex-direction: column; }
    }
    @media (max-width: 520px) {
      .section { padding: 58px 0; }
      .hero-actions { flex-direction: column; }
      .btn { width: 100%; }
      .hero-metrics, .process-grid, .footer-top { grid-template-columns: 1fr; }
      .topic-body h3 { font-size: 21px; }
      .metric strong { font-size: 24px; }
      .filters { overflow-x: auto; flex-wrap: nowrap; padding-bottom: 4px; }
      .chip { white-space: nowrap; }
    }