/* roulang page: index */
:root{
    --ink:#0a0a0e;
    --ink-soft:#121216;
    --ink-line:rgba(255,255,255,.12);
    --paper:#f7f4ef;
    --paper-soft:#fffdf9;
    --line:#e5dfd6;
    --neon:#c9fa62;
    --neon-soft:rgba(201,250,98,.16);
    --muted:#8f8e89;
    --card-radius:20px;
  }
  *{box-sizing:border-box}
  html{scroll-behavior:smooth}
  body{
    margin:0;
    background:var(--paper);
    color:var(--ink);
    font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
    line-height:1.75;
    -webkit-font-smoothing:antialiased;
  }
  a{color:inherit;text-decoration:none;transition:all .2s ease}
  img{max-width:100%;display:block}
  ul,ol{padding:0;margin:0;list-style:none}
  p{margin:0}
  h1,h2,h3,h4{line-height:1.2;margin:0;text-wrap:balance}
  button{font-family:inherit}
  input,textarea{font-family:inherit}
  .container-main{max-width:82rem;margin:0 auto;padding-left:2rem;padding-right:2rem}
  .text-neon{color:var(--neon)}
  .text-muted{color:var(--muted)}
  .bg-ink{background:var(--ink)}
  .bg-ink-soft{background:var(--ink-soft)}
  .bg-paper{background:var(--paper)}
  .eyebrow{
    display:inline-block;
    font-size:.75rem;
    letter-spacing:.2em;
    color:var(--muted);
    text-transform:uppercase;
    margin-bottom:1rem;
  }
  .header-main{
    position:fixed;
    top:0;left:0;right:0;z-index:80;
    background:rgba(10,10,14,.82);
    -webkit-backdrop-filter:blur(14px);
    backdrop-filter:blur(14px);
    border-bottom:1px solid var(--ink-line);
  }
  .nav-warp{display:flex;align-items:center;justify-content:space-between;height:80px}
  .brand-logo{
    font-size:1.25rem;
    font-weight:900;
    letter-spacing:.02em;
    color:#fff;
    display:inline-flex;
    align-items:center;
    gap:.5rem;
  }
  .brand-logo .brand-mark{
    width:9px;height:22px;
    background:var(--neon);
    border-radius:2px;
    display:inline-block;
  }
  .nav-list{display:flex;align-items:center;gap:2.2rem}
  .nav-link{
    position:relative;
    color:rgba(255,255,255,.72);
    font-size:.94rem;
    font-weight:500;
    line-height:80px;
  }
  .nav-link::after{
    content:"";
    position:absolute;
    bottom:18px;left:0;right:auto;
    width:0;height:1px;
    background:var(--neon);
    transition:width .25s ease;
  }
  .nav-link:hover,
  .nav-link.active{
    color:#fff;
  }
  .nav-link:hover::after,
  .nav-link.active::after{
    width:100%;
  }
  .btn-solid{
    display:inline-flex;
    align-items:center;
    justify-content:center;
    min-height:46px;
    padding:0 1.6rem;
    border:none;
    border-radius:999px;
    background:var(--neon);
    color:var(--ink);
    font-weight:700;
    font-size:.94rem;
    cursor:pointer;
    transition:box-shadow .2s ease,transform .2s ease,background .2s ease;
  }
  .btn-solid:hover{
    background:#d4ff70;
    box-shadow:0 0 26px rgba(201,250,98,.55);
    transform:translateY(-2px);
  }
  .btn-outline{
    display:inline-flex;
    align-items:center;
    justify-content:center;
    min-height:48px;
    padding:0 1.6rem;
    border:1px solid rgba(255,255,255,.5);
    border-radius:999px;
    color:#fff;
    background:transparent;
    font-weight:600;
    font-size:.95rem;
    cursor:pointer;
    transition:all .2s ease;
  }
  .btn-outline:hover{
    border-color:#fff;
    background:#fff;
    color:var(--ink);
  }
  .btn-ok{
    background:var(--neon);
    color:var(--ink);
    min-height:56px;
    border:none;
    border-radius:999px;
    padding:0 2rem;
    font-weight:700;
    cursor:pointer;
    transition:box-shadow .2s ease,transform .2s ease;
  }
  .btn-ok:hover{
    box-shadow:0 4px 28px rgba(201,250,98,.5);
    transform:translateY(-2px);
  }
  .menu-btn{
    display:inline-flex;
    width:44px;height:44px;
    border:1px solid rgba(255,255,255,.25);
    border-radius:12px;
    background:transparent;
    color:#fff;
    align-items:center;
    justify-content:center;
  }
  .mobile-panel{
    display:none;
    border-top:1px solid var(--ink-line);
    padding:1rem 1.4rem 1.6rem;
    background:rgba(10,10,14,.98);
  }
  .mobile-panel.open{display:block}
  .mobile-panel .mnav-links a{
    display:block;
    padding:.8rem 0;
    font-size:1.2rem;
    font-weight:700;
    color:#fff;
    border-bottom:1px solid rgba(255,255,255,.08);
  }
  .mobile-panel .mnav-cta{
    margin-top:1.2rem;
    display:flex;
  }
  .hero-wrap{
    position:relative;
    min-height:calc(100vh - 0px);
    display:flex;
    align-items:center;
    overflow:hidden;
    background:var(--ink);
    color:#fff;
    padding-top:80px;
  }
  .hero-bg{
    position:absolute;
    inset:0;
    background-size:cover;
    background-position:center;
  }
  .hero-mask{
    position:absolute;
    inset:0;
    background:rgba(10,10,10,.78);
  }
  .hero-grid-layer{
    position:absolute;
    inset:0;
    background-image:
      linear-gradient(rgba(255,255,255,.045) 1px,transparent 1px),
      linear-gradient(90deg,rgba(255,255,255,.045) 1px,transparent 1px);
    background-size:64px 64px;
    pointer-events:none;
  }
  .hero-title{
    font-size:4rem;
    font-weight:900;
    letter-spacing:-.03em;
    line-height:1.05;
    color:#fff;
  }
  @media (min-width:768px){
    .hero-title{font-size:4.6rem}
  }
  .scroll-badge{
    position:absolute;
    bottom:34px;
    left:50%;
    transform:translateX(-50%);
    display:flex;
    flex-direction:column;
    align-items:center;
    gap:.4rem;
    color:rgba(255,255,255,.6);
    font-size:.7rem;
    letter-spacing:.28em;
  }
  .scroll-line{
    width:1px;height:42px;
    background:linear-gradient(to bottom,transparent,rgba(255,255,255,.35));
    overflow:hidden;
    position:relative;
  }
  .scroll-line::after{
    content:"";
    position:absolute;
    top:-40%;
    left:0;
    width:100%;
    height:50%;
    background:var(--neon);
    animation:scrollDown 1.2s ease-in-out infinite;
  }
  @keyframes scrollDown{
    0%{top:-40%}
    100%{top:120%}
  }
  .visual-zone{
    position:relative;
    width:100%;
    background:
      linear-gradient(145deg,rgba(255,255,255,.08),rgba(255,255,255,.01) 40%),
      #131318;
    border:1px solid rgba(255,255,255,.14);
    border-radius:24px;
    padding:1.5rem;
    overflow:hidden;
  }
  .visual-corner{
    position:absolute;
    top:18px;right:18px;
    width:46px;height:46px;
    border-top:1px solid var(--neon);
    border-right:1px solid var(--neon);
    opacity:.8;
  }
  .visual-dots{
    position:absolute;
    bottom:16px;left:16px;
    width:46px;height:46px;
    background-image:radial-gradient(rgba(255,255,255,.22) 1px,transparent 1px);
    background-size:10px 10px;
  }
  .metrics-section{
    background:var(--paper);
    border-top:1px solid var(--line);
    padding:5.5rem 0;
  }
  @media (min-width:768px){.metrics-section{padding:8rem 0}}
  .metric-item{
    padding:0 1.5rem;
    border-left:1px solid var(--line);
  }
  .metric-item:first-child{border-left:none;padding-left:0}
  .metric-num{
    font-size:3.6rem;
    font-weight:900;
    line-height:1;
    letter-spacing:-.04em;
    color:var(--ink);
    font-variant-numeric:tabular-nums;
    margin-bottom:.5rem;
  }
  .metric-label{
    font-size:.9rem;
    color:var(--muted);
    line-height:1.7;
  }
  .block-section{padding:5rem 0}
  @media (min-width:768px){.block-section{padding:7.5rem 0}}
  .block-title{
    font-size:2.4rem;
    font-weight:900;
    letter-spacing:-.02em;
    color:var(--ink);
  }
  @media (min-width:768px){.block-title{font-size:3rem}}
  .block-title-light{color:#fff}
  .bento-tile{
    position:relative;
    border-radius:var(--card-radius);
    padding:1.8rem;
    overflow:hidden;
    transition:transform .3s ease-out,border-color .3s ease,box-shadow .3s ease;
    border:1px solid transparent;
    display:block;
  }
  .bento-tile:hover{
    transform:translateY(-4px);
    border-color:var(--neon);
    box-shadow:0 32px 70px -50px rgba(0,0,0,.42);
  }
  .bento-num{
    font-size:.7rem;
    letter-spacing:.28em;
    color:var(--muted);
    font-weight:600;
  }
  .bento-arrow{
    position:absolute;
    right:1.4rem;
    bottom:1.4rem;
    width:48px;height:48px;
    border-radius:50%;
    border:1px solid currentColor;
    display:flex;
    align-items:center;
    justify-content:center;
    font-size:1.2rem;
    transition:transform .3s ease;
  }
  .bento-tile:hover .bento-arrow{
    transform:translateX(6px);
  }
  .tile-img{
    width:100%;
    height:220px;
    object-fit:cover;
    border-radius:14px;
  }
  .cms-news-list{
    border-top:1px solid rgba(255,255,255,.1);
  }
  .cms-news-item{
    display:flex;
    align-items:center;
    gap:1.4rem;
    min-height:116px;
    border-bottom:1px solid rgba(255,255,255,.1);
    padding:1.25rem .6rem;
    position:relative;
    transition:background .3s ease;
  }
  .cms-news-item::before{
    content:"";
    position:absolute;
    left:0;top:22%;bottom:22%;
    width:3px;
    background:var(--neon);
    opacity:0;
    transform:scaleY(.3);
    transition:all .3s ease;
  }
  .cms-news-item:hover{
    background:rgba(255,255,255,.045);
  }
  .cms-news-item:hover::before{
    opacity:1;
    transform:scaleY(1);
  }
  .cms-news-cat{
    flex:none;
    display:inline-flex;
    align-items:center;
    font-size:.74rem;
    color:var(--neon);
    border:1px solid rgba(201,250,98,.45);
    border-radius:999px;
    padding:.3rem .8rem;
    letter-spacing:.06em;
  }
  .cms-news-main{
    flex:1 1 auto;
    min-width:0;
  }
  .cms-news-main h3{
    font-size:1.05rem;
    font-weight:700;
    color:#fff;
    margin-bottom:.2rem;
    white-space:nowrap;
    overflow:hidden;
    text-overflow:ellipsis;
  }
  .cms-news-main p{
    color:rgba(255,255,255,.52);
    font-size:.9rem;
    white-space:nowrap;
    overflow:hidden;
    text-overflow:ellipsis;
  }
  .cms-news-date{
    flex:none;
    color:rgba(255,255,255,.4);
    font-size:.86rem;
    font-variant-numeric:tabular-nums;
    letter-spacing:.04em;
  }
  .cms-news-arrow{
    flex:none;
    width:44px;height:44px;
    border-radius:50%;
    display:flex;
    align-items:center;
    justify-content:center;
    color:#fff;
    border:1px solid rgba(255,255,255,.24);
    transition:all .3s ease;
  }
  .cms-news-item:hover .cms-news-arrow{
    background:var(--neon);
    color:var(--ink);
    border-color:var(--neon);
  }
  .cms-empty{
    display:flex;
    align-items:center;
    justify-content:center;
    gap:.6rem;
    min-height:172px;
    border-bottom:1px solid rgba(255,255,255,.1);
    color:rgba(255,255,255,.52);
  }
  .cms-empty::before{
    content:"";
    width:8px;height:8px;
    border-radius:50%;
    background:var(--neon);
    box-shadow:0 0 10px rgba(201,250,98,.5);
  }
  .compare-card{
    border-radius:20px;
    padding:1.8rem;
    border:1px solid rgba(255,255,255,.12);
    background:rgba(255,255,255,.025);
  }
  .compare-card.right{
    border-color:var(--neon);
    position:relative;
  }
  .compare-card.right::before{
    content:"";
    position:absolute;
    top:-1px;left:-1px;
    width:20px;height:20px;
    border-top:2px solid var(--neon);
    border-left:2px solid var(--neon);
    border-top-left-radius:14px;
  }
  .compare-list li{
    display:flex;
    gap:.7rem;
    align-items:flex-start;
    padding:.45rem 0;
    color:rgba(255,255,255,.8);
    font-size:.94rem;
    line-height:1.7;
  }
  .compare-icon{
    flex:none;
    width:22px;
    height:22px;
    border-radius:50%;
    display:inline-flex;
    align-items:center;
    justify-content:center;
    font-size:.7rem;
    font-weight:900;
    margin-top:.2rem;
  }
  .compare-icon.no{
    background:rgba(255,255,255,.12);
    color:#aaa;
  }
  .compare-icon.yes{
    background:var(--neon);
    color:var(--ink);
  }
  .vs-badge{
    width:70px;
    height:70px;
    border-radius:50%;
    background:var(--neon);
    color:var(--ink);
    font-weight:900;
    font-size:1rem;
    display:flex;
    align-items:center;
    justify-content:center;
    margin:0 auto;
    border:6px solid #0f0f13;
    position:relative;
    z-index:2;
  }
  .faq-wrap{
    background:var(--paper);
  }
  .faq-list{
    border-top:1px solid var(--line);
  }
  .faq-item{
    border-bottom:1px solid var(--line);
  }
  .faq-question{
    width:100%;
    display:flex;
    align-items:center;
    justify-content:space-between;
    gap:1rem;
    background:none;
    border:none;
    padding:1.5rem 0;
    cursor:pointer;
    font-size:1.02rem;
    font-weight:700;
    color:var(--ink);
    text-align:left;
  }
  .faq-icon{
    flex:none;
    width:28px;height:28px;
    border-radius:50%;
    border:1px solid rgba(0,0,0,.2);
    display:flex;
    align-items:center;
    justify-content:center;
    font-size:.95rem;
    transition:all .3s ease;
  }
  .faq-item.open .faq-icon{
    transform:rotate(135deg);
    background:var(--neon);
    border-color:var(--neon);
    color:var(--ink);
  }
  .faq-answer{
    display:none;
    padding-bottom:1.5rem;
    color:#555;
    font-size:.95rem;
    line-height:1.9;
    max-width:62rem;
  }
  .faq-item.open .faq-answer{
    display:block;
  }
  .contact-panel{
    display:grid;
    grid-template-columns:1.1fr .9fr;
    gap:0;
    background:#fffdf8;
    border-radius:24px;
    overflow:hidden;
    box-shadow:0 40px 100px -70px rgba(0,0,0,.55);
  }
  .contact-form-side{
    padding:2.5rem;
  }
  .contact-info-side{
    background:#111114;
    color:rgba(255,255,255,.8);
    padding:2.5rem;
  }
  .form-field{
    margin-bottom:1.35rem;
    position:relative;
  }
  .form-field label{
    display:block;
    font-size:.84rem;
    font-weight:600;
    color:var(--muted);
    margin-bottom:.4rem;
  }
  .form-control{
    width:100%;
    border:0;
    border-bottom:1px solid var(--line);
    background:transparent;
    font-size:1rem;
    padding:.85rem 0;
    border-radius:0;
    outline:none;
    color:var(--ink);
    transition:border-color .25s ease;
  }
  .form-control:focus{
    border-color:var(--neon);
  }
  .form-control.error{
    border-color:#dc4c46;
  }
  .form-note{
    font-size:.78rem;
    color:#dc4c46;
    margin-top:.2rem;
    display:none;
  }
  .contact-line{
    display:flex;
    align-items:center;
    gap:.7rem;
    padding:.6rem 0;
    font-size:.92rem;
    border-bottom:1px solid rgba(255,255,255,.08);
  }
  .contact-line:last-child{border-bottom:none}
  .footer-main{
    background:#09090d;
    color:rgba(255,255,255,.72);
  }
  .footer-col h4{
    color:#fff;
    font-size:.95rem;
    font-weight:800;
    margin-bottom:1rem;
  }
  .footer-links li{
    margin-bottom:.5rem;
  }
  .footer-links a{
    color:rgba(255,255,255,.6);
    font-size:.88rem;
  }
  .footer-links a:hover{
    color:var(--neon);
  }
  .footer-bottom{
    border-top:1px solid rgba(255,255,255,.1);
    color:rgba(255,255,255,.5);
    font-size:.82rem;
    padding:1.5rem 0;
    display:flex;
    justify-content:space-between;
    flex-wrap:wrap;
    gap:.6rem;
  }
  .site-footer-by{
    color:rgba(255,255,255,.48);
    font-size:.8rem;
  }
  .form-msg{
    display:none;
    margin-top:1.1rem;
    background:var(--neon-soft);
    border:1px solid rgba(201,250,98,.45);
    border-radius:12px;
    padding:.8rem 1rem;
    color:#111;
    font-size:.9rem;
  }
  @media (prefers-reduced-motion:reduce){
    *{animation:none!important;transition:none!important;scroll-behavior:auto!important}
    .bento-tile:hover{transform:none}
    .btn-solid:hover{transform:none}
    .btn-ok:hover{transform:none}
  }
  @media (max-width:1024px){
    .container-main{padding-left:1.5rem;padding-right:1.5rem}
    .hero-title{font-size:3.6rem}
    .nav-list{display:none}
    .menu-btn{display:inline-flex}
  }
  @media (min-width:1025px){
    .menu-btn{display:none}
  }
  @media (max-width:768px){
    .container-main{padding-left:1.1rem;padding-right:1.1rem}
    .hero-title{font-size:2.8rem;line-height:1.1}
    .nav-warp{height:70px}
    .block-title{font-size:2rem}
    .metrics-section{padding:4rem 0}
    .grid-gap-col{grid-template-columns:1fr}
    .metric-item{border-left:none;padding:0;margin-bottom:1.8rem}
    .contact-panel{grid-template-columns:1fr}
    .cms-news-item{
      align-items:flex-start;
      flex-wrap:wrap;
      padding:1.2rem 0;
    }
    .cms-news-date{width:auto;font-size:.8rem}
    .cms-news-main h3{
      font-size:1rem;
      white-space:normal;
      display:-webkit-box;
      -webkit-line-clamp:2;
      -webkit-box-orient:vertical;
    }
    .cms-news-main p{white-space:normal;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical}
    .cms-news-arrow{display:none}
    .hero-title-wrap{padding-right:0}
    .footer-bottom{flex-direction:column}
  }
  @media (max-width:520px){
    .hero-title{font-size:2.3rem}
    .brand-logo{font-size:1.05rem}
    .bento-tile{padding:1.3rem}
    .btn-outline,.btn-solid{min-height:44px;padding:0 1.1rem}
    .footer-col{width:100%}
  }

/* roulang page: article */
:root {
    --ink: #0a0a09;
    --ink-soft: #151512;
    --ink-2: #1e1e19;
    --paper: #f6f3ea;
    --paper-light: #fffdf7;
    --paper-deep: #ede6d8;
    --line: rgba(17, 17, 13, .12);
    --line-dark: rgba(17, 17, 13, .22);
    --neon: #c9f345;
    --neon-soft: rgba(201, 243, 69, .18);
    --neon-glow: rgba(201, 243, 69, .4);
    --muted: #6f6b5f;
    --danger: #d75a4a;
    --radius: 20px;
    --radius-sm: 12px;
    --ease: cubic-bezier(.22, .61, .36, 1);
  }

  *, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
  }

  html {
    scroll-behavior: smooth;
  }

  body {
    margin: 0;
    background: var(--paper);
    color: var(--ink);
    font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    font-size: 16px;
    line-height: 1.75;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
  }

  img {
    display: block;
    max-width: 100%;
  }

  a {
    color: inherit;
    text-decoration: none;
  }

  button {
    border: none;
    background: none;
    font-family: inherit;
    cursor: pointer;
  }

  ::selection {
    background: var(--neon);
    color: var(--ink);
  }

  a:focus-visible,
  button:focus-visible,
  summary:focus-visible {
    outline: 2px solid var(--neon);
    outline-offset: 3px;
    border-radius: 4px;
  }

  @media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
      animation-duration: .01ms !important;
      transition-duration: .01ms !important;
      scroll-behavior: auto !important;
    }
  }

  .container-main {
    max-width: 1280px;
    margin-inline: auto;
    padding-inline: clamp(20px, 4vw, 48px);
  }

  .wrap-main {
    max-width: 1280px;
    margin-inline: auto;
    padding-inline: clamp(20px, 4vw, 48px);
  }

  .wrap-reader {
    max-width: 780px;
    margin-inline: auto;
    padding-inline: clamp(22px, 4vw, 40px);
  }

  .site-header {
    position: sticky;
    top: 0;
    z-index: 80;
    background: rgba(10, 10, 9, .86);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    border-bottom: 1px solid rgba(255, 255, 255, .08);
  }

  .brand-logo {
    display: inline-flex;
    align-items: center;
    gap: 11px;
    font-weight: 900;
    font-size: 22px;
    letter-spacing: -.01em;
    color: #fff;
    white-space: nowrap;
  }

  .brand-logo:hover {
    color: var(--neon);
  }

  .brand-mark {
    position: relative;
    display: inline-block;
    width: 30px;
    height: 30px;
    flex: 0 0 30px;
    background: var(--neon);
    border-radius: 10px;
    box-shadow: 0 0 22px rgba(201, 243, 69, .38);
  }

  .brand-mark::after {
    content: "";
    position: absolute;
    top: 50%;
    left: 50%;
    width: 10px;
    height: 10px;
    background: var(--ink);
    border-radius: 50%;
    transform: translate(-50%, -50%);
  }

  .nav-list {
    display: flex;
    align-items: center;
    gap: 34px;
  }

  .nav-list .nav-link {
    position: relative;
    display: inline-block;
    font-size: 15px;
    font-weight: 500;
    color: rgba(255, 255, 255, .72);
    padding: 10px 2px;
    transition: color .2s ease;
  }

  .nav-list .nav-link::after {
    content: "";
    position: absolute;
    left: 0;
    bottom: 2px;
    height: 1px;
    width: 100%;
    background: var(--neon);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform .25s var(--ease);
  }

  .nav-list .nav-link:hover,
  .nav-list .nav-link.active {
    color: #fff;
  }

  .nav-list .nav-link:hover::after,
  .nav-list .nav-link.active::after {
    transform: scaleX(1);
  }

  .btn-neon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 52px;
    padding: 0 24px;
    border-radius: 999px;
    background: var(--neon);
    color: var(--ink);
    font-size: 15px;
    font-weight: 800;
    letter-spacing: .02em;
    transition: box-shadow .2s ease, background .2s ease, transform .2s ease;
  }

  .btn-neon:hover {
    box-shadow: 0 0 0 6px rgba(201, 243, 69, .15), 0 18px 44px -14px var(--neon-glow);
    transform: translateY(-2px);
  }

  .header-cta {
    min-height: 44px;
    padding: 0 22px;
  }

  .nav-toggle {
    display: none;
    width: 46px;
    height: 46px;
    border-radius: 999px;
    border: 1px solid rgba(255, 255, 255, .18);
    align-items: center;
    justify-content: center;
    position: relative;
    z-index: 90;
  }

  .nav-toggle span,
  .nav-toggle span::before,
  .nav-toggle span::after {
    content: "";
    position: absolute;
    width: 20px;
    height: 2px;
    background: #fff;
    border-radius: 3px;
    left: 50%;
    top: 50%;
    transition: transform .25s ease, opacity .2s ease;
  }

  .nav-toggle span {
    transform: translate(-50%, -50%);
  }

  .nav-toggle span::before {
    transform: translateY(-6px);
  }

  .nav-toggle span::after {
    transform: translateY(6px);
  }

  .nav-toggle.is-open span {
    background: transparent;
  }

  .nav-toggle.is-open span::before {
    transform: translateY(0) rotate(45deg);
  }

  .nav-toggle.is-open span::after {
    transform: translateY(0) rotate(-45deg);
  }

  .nav-mobile-cta {
    display: none;
  }

  @media (max-width: 1024px) {
    .nav-list {
      position: fixed;
      inset: 0;
      z-index: 80;
      flex-direction: column;
      justify-content: center;
      align-items: flex-start;
      gap: 26px;
      padding: 100px 40px 48px;
      background: var(--ink);
      transform: translateX(100%);
      transition: transform .3s var(--ease);
    }

    .nav-list.open {
      transform: translateX(0);
    }

    .nav-list .nav-link {
      font-size: 25px;
      color: rgba(255, 255, 255, .82);
    }

    .nav-toggle {
      display: inline-flex;
    }

    .header-cta {
      display: none;
    }

    .nav-mobile-cta {
      display: inline-flex;
      margin-top: 12px;
      width: 100%;
    }
  }

  @media (max-width: 640px) {
    .brand-logo {
      font-size: 19px;
      gap: 9px;
    }

    .brand-mark {
      width: 26px;
      height: 26px;
      flex-basis: 26px;
      border-radius: 8px;
    }
  }

  /* article page */
  .article-heading {
    border-bottom: 1px solid var(--line);
  }

  .breadcrumb-main {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    color: var(--muted);
  }

  .breadcrumb-main a {
    color: var(--muted);
    transition: color .2s ease;
  }

  .breadcrumb-main a:hover {
    color: var(--ink);
  }

  .breadcrumb-main i {
    font-style: normal;
    color: rgba(17, 17, 13, .3);
  }

  .breadcrumb-main .current {
    color: var(--ink);
    font-weight: 600;
  }

  .article-title {
    font-size: clamp(28px, 4vw, 46px);
    line-height: 1.18;
    font-weight: 900;
    letter-spacing: -.02em;
    color: var(--ink);
    max-width: 720px;
  }

  .meta-line {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 16px;
    color: var(--muted);
    font-size: 14px;
  }

  .article-tag {
    display: inline-flex;
    align-items: center;
    padding: 5px 12px;
    border: 1px solid var(--line-dark);
    border-radius: 8px;
    font-size: 13px;
    color: var(--ink);
    font-weight: 600;
    background: transparent;
    transition: background .2s ease, border-color .2s ease, color .2s ease;
  }

  .article-tag:hover {
    border-color: var(--ink);
    background: var(--ink);
    color: var(--paper-light);
  }

  .meta-date {
    display: inline-flex;
    align-items: center;
    gap: 7px;
  }

  .meta-sep {
    width: 3px;
    height: 3px;
    border-radius: 50%;
    background: rgba(17, 17, 13, .24);
  }

  .article-content {
    color: #201f1b;
    font-size: 17px;
    line-height: 1.95;
  }

  .article-content > * + * {
    margin-top: 1.25em;
  }

  .article-content p {
    line-height: 1.95;
  }

  .article-content h2,
  .article-content h3,
  .article-content h4 {
    color: var(--ink);
    line-height: 1.3;
    letter-spacing: -.02em;
    font-weight: 800;
  }

  .article-content h2 {
    font-size: 28px;
    margin-top: 2.2em;
    margin-bottom: .7em;
    padding-top: .2em;
  }

  .article-content h3 {
    font-size: 21px;
    margin-top: 1.8em;
    margin-bottom: .6em;
    font-weight: 700;
  }

  .article-content h4 {
    font-size: 17px;
    margin-top: 1.6em;
    font-weight: 700;
  }

  .article-content a {
    color: #3d6a1f;
    text-decoration: underline;
    text-underline-offset: 4px;
    text-decoration-color: rgba(61, 106, 31, .35);
    transition: color .2s ease, text-decoration-color .2s ease;
  }

  .article-content a:hover {
    color: var(--neon);
    text-decoration-color: var(--ink);
  }

  .article-content strong {
    font-weight: 700;
  }

  .article-content img {
    border-radius: 16px;
    margin-top: 2.2em;
    margin-bottom: .4em;
  }

  .article-content blockquote {
    border-left: 3px solid var(--neon);
    background: var(--paper-deep);
    padding: 20px 22px;
    border-radius: 0 16px 16px 0;
    color: #3a382f;
    font-size: 16px;
    line-height: 1.8;
  }

  .article-content ul,
  .article-content ol {
    padding-left: 1.4em;
    margin-top: 1.4em;
    margin-bottom: 1.4em;
  }

  .article-content ul {
    list-style: square;
  }

  .article-content li {
    margin-top: .62em;
    padding-left: .3em;
  }

  .article-content li::marker {
    color: #8dbf1f;
  }

  .article-content pre {
    background: var(--ink-soft);
    color: #e8e8e3;
    padding: 20px 22px;
    border-radius: 14px;
    overflow-x: auto;
    font-size: 14px;
    line-height: 1.75;
  }

  .article-content code {
    font-family: "SFMono-Regular", Consolas, monospace;
    font-size: .92em;
    background: var(--paper-deep);
    padding: 2px 7px;
    border-radius: 6px;
    color: #20201a;
  }

  .article-content pre code {
    background: transparent;
    color: inherit;
    padding: 0;
  }

  .article-content hr {
    border: none;
    border-top: 1px solid var(--line-dark);
    margin: 2.6em 0;
  }

  .article-utils {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
    justify-content: space-between;
    align-items: center;
  }

  .utils-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    font-weight: 600;
    color: var(--ink);
    padding: 12px 4px;
    transition: color .2s ease, gap .2s ease;
  }

  .utils-link:hover {
    color: #5e8a28;
    gap: 12px;
  }

  .empty-body {
    padding: 80px 0 120px;
  }

  .empty-outer {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
  }

  .empty-icon {
    position: relative;
    width: 64px;
    height: 64px;
    border-radius: 20px;
    background: var(--neon);
    box-shadow: 0 0 0 14px var(--neon-soft);
    margin-bottom: 28px;
  }

  .empty-icon::after {
    content: "";
    position: absolute;
    top: 50%;
    left: 50%;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--ink);
    transform: translate(-50%, -50%);
  }

  /* related cards */
  .related-posts {
    background: var(--paper-deep);
  }

  .rel-card {
    position: relative;
    display: flex;
    background: var(--paper-light);
    border-radius: 22px;
    overflow: hidden;
    border: 1px solid var(--line);
    transition: transform .3s ease, box-shadow .3s ease, border-color .3s ease;
  }

  .rel-card:hover {
    transform: translateY(-4px);
    border-color: var(--neon);
    box-shadow: 0 26px 46px -34px rgba(10, 10, 9, .32);
  }

  .rel-cover {
    width: 42%;
    min-height: 200px;
    object-fit: cover;
    overflow: hidden;
    flex: 0 0 auto;
  }

  .rel-body {
    padding: 26px 26px 24px;
    display: flex;
    flex-direction: column;
    justify-content: center;
  }

  .rel-kicker {
    font-size: 12px;
    font-weight: 700;
    letter-spacing: .14em;
    color: #628c24;
    text-transform: uppercase;
  }

  .rel-title {
    font-size: 19px;
    font-weight: 800;
    line-height: 1.35;
    color: var(--ink);
    margin-top: 10px;
  }

  .rel-desc {
    font-size: 14px;
    color: var(--muted);
    margin-top: 10px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
  }

  .rel-link {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    margin-top: 18px;
    font-size: 14px;
    font-weight: 700;
    color: var(--ink);
    transition: color .2s ease, gap .2s ease;
  }

  .rel-link:hover {
    color: #628c24;
    gap: 11px;
  }

  @media (max-width: 680px) {
    .rel-card {
      flex-direction: column;
    }

    .rel-cover {
      width: 100%;
      height: 160px;
      min-height: 0;
    }
  }

  /* footer */
  .footer-main {
    background: var(--ink-soft);
    color: rgba(255, 255, 255, .62);
  }

  .footer-main h4 {
    font-size: 14px;
    font-weight: 700;
    letter-spacing: .08em;
    color: #fff;
    margin-bottom: 18px;
  }

  .footer-links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 11px;
  }

  .footer-links a {
    color: rgba(255, 255, 255, .56);
    font-size: 14px;
    transition: color .2s ease, padding-left .2s ease;
  }

  .footer-links a:hover {
    color: var(--neon);
    padding-left: 3px;
  }

  .footer-bottom {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    padding: 22px 0 28px;
    border-top: 1px solid rgba(255, 255, 255, .1);
    font-size: 13px;
    color: rgba(255, 255, 255, .38);
  }

  .site-footer-by {
    font-weight: 600;
    letter-spacing: .02em;
  }

/* roulang page: category1 */
:root {
      --ink: #0c0e12;
      --carbon: #171a20;
      --paper: #f7f5ef;
      --paper-deep: #efece4;
      --neon: #d9f75c;
      --muted: #7b7e78;
      --line: #e0dccf;
      --radius-xl: 20px;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Segoe UI", Roboto, sans-serif;
      background: var(--paper);
      color: var(--ink);
      line-height: 1.8;
      -webkit-font-smoothing: antialiased;
    }
    img {
      max-width: 100%;
      display: block;
    }
    a {
      color: inherit;
      text-decoration: none;
    }
    ul,
    ol {
      list-style: none;
    }
    button {
      font: inherit;
      background: none;
      border: none;
      cursor: pointer;
    }
    h1,
    h2,
    h3,
    h4 {
      line-height: 1.2;
    }
    .container-main {
      width: 100%;
      max-width: 80rem;
      margin-inline: auto;
      padding-inline: 1.25rem;
    }
    .eyebrow {
      display: inline-flex;
      align-items: center;
      font-size: 0.75rem;
      font-weight: 500;
      letter-spacing: 0.2em;
      text-transform: uppercase;
      color: var(--muted);
    }
    .eyebrow::before {
      content: "";
      width: 1.5rem;
      height: 1px;
      background: var(--neon);
      margin-right: 0.75rem;
    }
    .site-header {
      position: sticky;
      top: 0;
      z-index: 60;
      background: rgba(10, 12, 15, 0.88);
      border-bottom: 1px solid rgba(255, 255, 255, 0.07);
      backdrop-filter: blur(14px);
      -webkit-backdrop-filter: blur(14px);
    }
    .brand-logo {
      display: inline-flex;
      align-items: center;
      gap: 0.65rem;
      color: #fff;
      font-weight: 800;
      font-size: 1.15rem;
      letter-spacing: 0.02em;
      white-space: nowrap;
    }
    .brand-mark {
      width: 26px;
      height: 26px;
      border-radius: 7px;
      background: var(--neon);
      position: relative;
      box-shadow: 0 0 18px rgba(217, 247, 92, 0.4);
    }
    .brand-mark::after {
      content: "";
      position: absolute;
      width: 8px;
      height: 8px;
      left: 9px;
      top: 9px;
      background: var(--ink);
      border-radius: 50%;
    }
    .main-nav-desktop {
      display: none;
      align-items: center;
      gap: 2rem;
    }
    .nav-link {
      position: relative;
      display: inline-flex;
      align-items: center;
      font-size: 0.94rem;
      font-weight: 600;
      color: rgba(255, 255, 255, 0.72);
      padding: 0.5rem 0.15rem;
      transition: color 0.2s ease;
    }
    .nav-link::after {
      content: "";
      position: absolute;
      left: 0;
      bottom: 0;
      width: 0;
      height: 2px;
      background: var(--neon);
      border-radius: 2px;
      transition: width 0.2s ease-out;
    }
    .nav-link:hover {
      color: #fff;
    }
    .nav-link:hover::after,
    .nav-link.active::after {
      width: 100%;
    }
    .nav-link.active {
      color: #fff;
    }
    @media (min-width: 1024px) {
      .main-nav-desktop {
        display: flex;
      }
    }
    .btn-primary {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      min-height: 52px;
      padding: 0 1.5rem;
      border-radius: 999px;
      background: var(--neon);
      color: #10130b;
      font-weight: 800;
      font-size: 0.98rem;
      transition: box-shadow 0.2s ease, transform 0.2s ease, background 0.2s ease;
    }
    .btn-primary:hover {
      box-shadow: 0 0 0 5px rgba(217, 247, 92, 0.15), 0 10px 34px rgba(217, 247, 92, 0.3);
      transform: translateY(-2px);
    }
    .btn-primary:active {
      transform: translateY(0);
    }
    .btn-primary .btn-arrow {
      margin-left: 0.45rem;
      transition: transform 0.2s ease;
    }
    .btn-primary:hover .btn-arrow {
      transform: translateX(4px);
    }
    .btn-ghost {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      min-height: 50px;
      padding: 0 1.35rem;
      border-radius: 999px;
      border: 1px solid rgba(255, 255, 255, 0.5);
      color: #fff;
      font-weight: 700;
      transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
    }
    .btn-ghost:hover {
      background: rgba(255, 255, 255, 0.9);
      color: var(--ink);
      border-color: rgba(255, 255, 255, 0.9);
    }
    .header-cta {
      min-height: 44px;
      padding: 0 1.1rem;
    }
    .menu-trigger {
      width: 44px;
      height: 44px;
      border-radius: 12px;
      display: inline-flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 6px;
      border: 1px solid rgba(255, 255, 255, 0.2);
    }
    .menu-trigger span {
      display: block;
      width: 19px;
      height: 2px;
      border-radius: 3px;
      background: #fff;
    }
    .mobile-menu {
      position: fixed;
      inset: 0;
      z-index: 80;
      background: rgba(8, 10, 12, 0.98);
      opacity: 0;
      visibility: hidden;
      transform: translateY(-14px);
      transition: opacity 0.2s ease, transform 0.2s ease, visibility 0.2s;
    }
    .mobile-menu.open {
      opacity: 1;
      visibility: visible;
      transform: translateY(0);
    }
    .mobile-menu-close {
      width: 46px;
      height: 46px;
      border-radius: 999px;
      border: 1px solid rgba(255, 255, 255, 0.25);
      color: #fff;
      font-size: 0.85rem;
      display: inline-flex;
      align-items: center;
      justify-content: center;
    }
    .mobile-nav-wrap {
      display: flex;
      flex-direction: column;
      gap: 1.5rem;
      margin-top: 2.5rem;
    }
    .mobile-nav-wrap .nav-link {
      font-size: 1.75rem;
      font-weight: 800;
      color: #fff;
    }
    .mobile-nav-wrap .nav-link::after {
      height: 3px;
    }
    @media (max-width: 641px) {
      .mobile-menu-close {
        width: 42px;
        height: 42px;
      }
    }
    .hero-grid-pattern {
      background-image: linear-gradient(rgba(255, 255, 255, 0.055) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.055) 1px, transparent 1px);
      background-size: 72px 72px;
    }
    .category-hero {
      background: var(--ink);
      color: #fff;
      overflow: hidden;
      position: relative;
    }
    .category-hero-title {
      font-size: clamp(2.4rem, 6vw, 4.6rem);
      font-weight: 900;
      letter-spacing: -0.03em;
      line-height: 1.08;
    }
    .category-hero-sub {
      display: block;
      margin-top: 1rem;
      font-size: clamp(1.2rem, 2.4vw, 2rem);
      font-weight: 700;
      color: rgba(255, 255, 255, 0.82);
      letter-spacing: -0.02em;
      line-height: 1.3;
    }
    .hero-note-box {
      border: 1px solid rgba(255, 255, 255, 0.14);
      border-radius: 20px;
      padding: 1.5rem 1.4rem;
      background: rgba(255, 255, 255, 0.05);
    }
    .hero-note-box p {
      color: rgba(255, 255, 255, 0.7);
      font-size: 0.95rem;
      line-height: 1.9;
      margin: 0.85rem 0 1rem;
    }
    .hero-tag {
      display: inline-flex;
      align-items: center;
      gap: 0.35rem;
      font-size: 0.78rem;
      background: rgba(217, 247, 92, 0.1);
      color: #dfed9f;
      padding: 4px 10px;
      border-radius: 999px;
      border: 1px solid rgba(217, 247, 92, 0.18);
    }
    .breadcrumb {
      display: flex;
      align-items: center;
      gap: 0.5rem;
      color: rgba(255, 255, 255, 0.48);
      font-size: 0.82rem;
    }
    .breadcrumb a {
      transition: color 0.2s ease;
    }
    .breadcrumb a:hover {
      color: var(--neon);
    }
    .breadcrumb span[aria-current="page"] {
      color: #fff;
    }
    .main-content-grid {
      background: var(--paper);
      color: var(--ink);
    }
    .catalog-item {
      border-bottom: 1px solid var(--line);
      padding: 0.55rem 0;
    }
    .catalog-anchor {
      display: flex;
      justify-content: space-between;
      align-items: center;
      gap: 0.75rem;
      padding: 0.42rem 0;
      font-size: 0.92rem;
      font-weight: 600;
      color: #43463e;
      transition: color 0.2s ease;
    }
    .catalog-anchor .mark {
      color: var(--muted);
      font-size: 0.88rem;
    }
    .catalog-anchor:hover {
      color: var(--ink);
    }
    .catalog-anchor:hover .mark {
      color: var(--neon);
    }
    .catalog-aside {
      position: static;
    }
    @media (min-width: 1024px) {
      .catalog-aside {
        position: sticky;
        top: 7rem;
      }
    }
    .aside-card {
      border: 1px solid var(--line);
      background: #fff;
      border-radius: 18px;
      overflow: hidden;
      margin-top: 1.25rem;
    }
    .aside-card-body {
      padding: 1.25rem 1.25rem 1.3rem;
    }
    .aside-card-title {
      font-weight: 800;
      font-size: 1.02rem;
      margin-bottom: 0.65rem;
    }
    .aside-card p {
      font-size: 0.86rem;
      line-height: 1.8;
      color: #6a6c68;
      margin: 0 0 0.9rem;
    }
    .aside-link {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 0.65rem;
      border-top: 1px solid #eeece5;
      padding: 0.65rem 1rem;
      font-size: 0.9rem;
      font-weight: 700;
      transition: background 0.2s ease, padding-left 0.2s ease;
    }
    .aside-link:hover {
      background: var(--ink);
      color: #fff;
      padding-left: 1.25rem;
    }
    .manual-block {
      scroll-margin-top: 6rem;
    }
    .manual-block + .manual-block {
      border-top: 1px solid #e8e4da;
      padding-top: 4.5rem;
    }
    .manual-h2 {
      margin: 0.7rem 0 1.1rem;
      font-size: 2rem;
      line-height: 1.25;
      letter-spacing: -0.02em;
      font-weight: 900;
    }
    .manual-lead {
      color: #5f635d;
      font-size: 1.02rem;
      max-width: 44rem;
      margin-bottom: 2rem;
    }
    .manual-link {
      display: flex;
      align-items: flex-start;
      gap: 1rem;
      width: 100%;
      background: #fff;
      border: 1px solid var(--line);
      border-radius: 16px;
      padding: 1.25rem 1.25rem;
      text-align: left;
      transition: transform 0.3s ease-out, border-color 0.3s ease, background 0.3s ease;
      margin-bottom: 0.85rem;
    }
    .manual-link:hover {
      transform: translateX(5px);
      border-color: var(--ink);
      background: #fff;
    }
    .manual-index {
      flex: none;
      font-size: 0.8rem;
      font-weight: 800;
      letter-spacing: 0.12em;
      color: var(--muted);
      line-height: 1.5;
    }
    .manual-tag {
      display: inline-flex;
      align-items: center;
      gap: 0.3rem;
      font-size: 0.76rem;
      color: #4d5050;
      background: #f2f0e8;
      border-radius: 6px;
      padding: 3px 8px;
      margin-bottom: 0.5rem;
      font-weight: 600;
    }
    .manual-title {
      font-weight: 800;
      font-size: 1.08rem;
      display: block;
      margin-bottom: 0.3rem;
      line-height: 1.4;
    }
    .manual-desc {
      font-size: 0.93rem;
      color: #686b66;
      margin: 0;
      line-height: 1.85;
    }
    .manual-arrow {
      flex: none;
      align-self: center;
      width: 34px;
      height: 34px;
      border-radius: 999px;
      border: 1px solid #d7d3c8;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      color: #383b35;
      font-size: 0.95rem;
      transition: background 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
    }
    .manual-link:hover .manual-arrow {
      transform: translateX(4px);
      background: var(--neon);
      border-color: var(--neon);
    }
    .proof-row {
      display: flex;
      gap: 1rem;
      background: transparent;
      border-bottom: 1px solid #e6e2d9;
      padding: 1.25rem 0.5rem 1.25rem;
      transition: background 0.3s ease;
    }
    .proof-row:first-child {
      border-top: 1px solid #e6e2d9;
    }
    .proof-row:hover {
      background: #fff;
    }
    .proof-check {
      flex: none;
      width: 28px;
      height: 28px;
      border-radius: 10px;
      background: rgba(217, 247, 92, 0.2);
      color: #2d350a;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-weight: 900;
      font-size: 0.82rem;
      margin-top: 0.18rem;
    }
    .proof-content h3 {
      font-weight: 800;
      font-size: 1.08rem;
      margin-bottom: 0.22rem;
    }
    .proof-content p {
      margin: 0;
      color: #6d706a;
      font-size: 0.95rem;
      line-height: 1.85;
    }
    .steps-outline {
      margin: 1.75rem 0 0;
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 0.75rem;
    }
    .step-item {
      border: 1px solid var(--line);
      border-radius: 16px;
      background: #fff;
      padding: 1.25rem 1.1rem;
      display: flex;
      gap: 1rem;
      align-items: flex-start;
      transition: transform 0.3s ease, border-color 0.3s ease;
    }
    .step-item:hover {
      transform: translateY(-3px);
      border-color: #bec8aa;
    }
    .step-num {
      flex: none;
      font-size: 0.85rem;
      font-weight: 900;
      letter-spacing: 0.08em;
      color: #171a14;
      background: var(--neon);
      border-radius: 8px;
      width: 34px;
      height: 34px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
    }
    .step-item h3 {
      font-weight: 800;
      font-size: 1rem;
      margin-bottom: 0.28rem;
    }
    .step-item p {
      font-size: 0.9rem;
      color: #6c7069;
      line-height: 1.75;
      margin: 0;
    }
    @media (max-width: 680px) {
      .steps-outline {
        grid-template-columns: 1fr;
      }
      .manual-h2 {
        font-size: 1.65rem;
      }
      .manual-block + .manual-block {
        padding-top: 3.25rem;
      }
      .main-content-grid > .grid {
        gap: 2.5rem;
      }
    }
    .faq-section {
      background: var(--paper-deep);
    }
    .faq-list {
      border-top: 1px solid #d9d5cb;
    }
    .faq-item {
      border-bottom: 1px solid #d9d5cb;
      background: transparent;
      transition: background 0.2s ease;
    }
    .faq-item.open {
      background: rgba(255, 255, 255, 0.55);
    }
    .faq-q {
      width: 100%;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 1.5rem;
      padding: 1.25rem 0.25rem;
      color: var(--ink);
      font-size: 1.05rem;
      font-weight: 800;
      text-align: left;
      transition: color 0.2s ease;
    }
    .faq-q .faq-icon {
      flex: none;
      width: 30px;
      height: 30px;
      border-radius: 999px;
      border: 1px solid var(--line);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-size: 1.2rem;
      font-weight: 300;
      color: var(--ink);
      transition: transform 0.2s ease, background 0.2s ease;
    }
    .faq-item.open .faq-icon {
      transform: rotate(45deg);
      background: var(--neon);
      border-color: var(--neon);
    }
    .faq-panel {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.26s ease;
    }
    .faq-item.open .faq-panel {
      max-height: 300px;
    }
    .faq-answer {
      padding: 0 2.8rem 1.45rem 1rem;
      color: #5f625c;
      font-size: 0.96rem;
      line-height: 1.9;
    }
    .cta-band {
      background: var(--ink);
      color: #fff;
      position: relative;
      overflow: hidden;
    }
    .cta-band::before {
      content: "";
      position: absolute;
      right: -8rem;
      top: -10rem;
      width: 26rem;
      height: 26rem;
      background: radial-gradient(circle, rgba(217, 247, 92, 0.12), transparent 65%);
      pointer-events: none;
    }
    .footer-main {
      background: var(--ink);
      color: rgba(255, 255, 255, 0.62);
    }
    .footer-main h4 {
      color: #fff;
      font-size: 0.95rem;
      font-weight: 800;
      margin-bottom: 1rem;
    }
    .footer-links li {
      margin-bottom: 0.7rem;
    }
    .footer-links a {
      font-size: 0.9rem;
      color: rgba(255, 255, 255, 0.55);
      transition: color 0.2s ease, padding-left 0.2s ease;
    }
    .footer-links a:hover {
      color: var(--neon);
      padding-left: 4px;
    }
    .footer-bottom {
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 0.65rem;
      border-top: 1px solid rgba(255, 255, 255, 0.1);
      padding: 1.4rem 0;
      font-size: 0.85rem;
      color: rgba(255, 255, 255, 0.42);
    }
    .site-footer-by {
      font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
      color: rgba(255, 255, 255, 0.46);
    }
    :where(a, button, input) {
      outline: none;
    }
    :where(a, button, input):focus-visible {
      outline: 2px solid var(--neon);
      outline-offset: 3px;
    }
    @media (prefers-reduced-motion: reduce) {
      *,
      *::before,
      *::after {
        scroll-behavior: auto !important;
        animation: none !important;
        transition: none !important;
      }
    }

/* roulang page: category2 */
:root {
      --ink: #0D0E10;
      --ink2: #17191B;
      --paper: #F6F3EC;
      --paper2: #EDEAE0;
      --neon: #DBF539;
      --neon2: #C5DF2B;
      --muted: #7D857B;
      --line: #E4E1D7;
      --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
        "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
      --shadow: 0 30px 60px -45px rgba(0, 0, 0, 0.6);
    }

    html {
      scroll-behavior: smooth;
    }

    body {
      font-family: var(--font);
      background: var(--paper);
      color: #1A1C1E;
      line-height: 1.75;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }

    a {
      color: inherit;
      text-decoration: none;
    }

    img {
      display: block;
      max-width: 100%;
    }

    button,
    input,
    textarea {
      font-family: inherit;
    }

    .container-main {
      width: 100%;
      max-width: 80rem;
      margin-right: auto;
      margin-left: auto;
      padding-right: 1.25rem;
      padding-left: 1.25rem;
    }

    @media (min-width: 768px) {
      .container-main {
        padding-right: 2rem;
        padding-left: 2rem;
      }
    }

    .site-header {
      position: sticky;
      top: 0;
      z-index: 80;
      background: rgba(13, 14, 16, 0.86);
      -webkit-backdrop-filter: blur(16px);
      backdrop-filter: blur(16px);
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    }

    .header-flex {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 76px;
    }

    .brand-logo {
      display: inline-flex;
      align-items: center;
      gap: 0.65rem;
      color: var(--paper);
      font-size: 1.25rem;
      font-weight: 900;
      letter-spacing: 0.01em;
      white-space: nowrap;
    }

    .brand-dot {
      width: 14px;
      height: 14px;
      min-width: 14px;
      background: var(--neon);
      border-radius: 4px;
      box-shadow: 0 0 0 5px rgba(219, 245, 57, 0.14);
    }

    .brand-text {
      color: var(--paper);
    }

    .nav-list {
      display: flex;
      align-items: center;
      gap: 0.2rem;
    }

    .nav-link {
      position: relative;
      display: inline-flex;
      align-items: center;
      padding: 0.6rem 0.85rem;
      color: rgba(246, 243, 236, 0.66);
      font-size: 0.95rem;
      font-weight: 500;
      border-radius: 10px;
      transition: color 0.2s ease;
    }

    .nav-link::after {
      content: "";
      position: absolute;
      left: 14px;
      bottom: 4px;
      width: 0;
      height: 2px;
      border-radius: 2px;
      background: var(--neon);
      transition: width 0.3s ease;
    }

    .nav-link:hover {
      color: var(--paper);
    }

    .nav-link:hover::after,
    .nav-link.active::after {
      width: calc(100% - 28px);
    }

    .nav-link.active {
      color: var(--paper);
    }

    .nav-actions {
      display: flex;
      align-items: center;
      gap: 0.75rem;
    }

    .btn-main {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 0.5rem;
      min-height: 48px;
      padding: 0 1.4rem;
      border-radius: 999px;
      background: var(--neon);
      color: #14161a;
      font-weight: 800;
      font-size: 0.98rem;
      border: 1px solid transparent;
      transition: all 0.2s ease;
    }

    .btn-main:hover {
      box-shadow: 0 0 0 6px rgba(219, 245, 57, 0.12),
        0 8px 28px rgba(219, 245, 57, 0.22);
      transform: translateY(-2px);
    }

    .btn-outline {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 0.5rem;
      min-height: 48px;
      padding: 0 1.35rem;
      border-radius: 999px;
      background: transparent;
      color: var(--paper);
      font-weight: 700;
      font-size: 0.96rem;
      border: 1px solid rgba(246, 243, 236, 0.42);
      transition: all 0.2s ease;
    }

    .btn-outline:hover {
      background: var(--paper);
      color: var(--ink);
      border-color: var(--paper);
    }

    .btn-main.btn-nav {
      min-height: 44px;
      padding: 0 1.3rem;
    }

    .menu-toggle {
      display: none;
      width: 44px;
      height: 44px;
      align-items: center;
      justify-content: center;
      flex-direction: column;
      gap: 5px;
      background: transparent;
      border: 1px solid rgba(255, 255, 255, 0.14);
      border-radius: 12px;
    }

    .menu-toggle span {
      width: 18px;
      height: 2px;
      border-radius: 2px;
      background: var(--paper);
      display: block;
    }

    .mobile-menu {
      display: none;
    }

    @media (max-width: 1023px) {
      .nav-desktop {
        display: none;
      }

      .nav-actions {
        display: none;
      }

      .menu-toggle {
        display: inline-flex;
      }

      .mobile-menu {
        position: fixed;
        left: 0;
        right: 0;
        top: 76px;
        bottom: 0;
        z-index: 70;
        background: rgba(8, 9, 10, 0.98);
        padding: 2rem 1.5rem 2.5rem;
        flex-direction: column;
        justify-content: space-between;
        transition: opacity 0.25s ease;
        display: none;
      }

      .mobile-menu.open {
        display: flex;
      }

      .mobile-nav-list {
        display: flex;
        flex-direction: column;
        gap: 0.2rem;
      }

      .mobile-nav-list a {
        display: block;
        padding: 1rem 0;
        font-size: 1.5rem;
        font-weight: 800;
        color: var(--paper);
        border-bottom: 1px solid rgba(255, 255, 255, 0.1);
      }

      .mobile-nav-list a.active {
        color: var(--neon);
      }

      .mobile-cta {
        margin-top: 1.5rem;
      }

      .mobile-cta .btn-main {
        width: 100%;
      }
    }

    .hero-category {
      position: relative;
      overflow: hidden;
      background:
        linear-gradient(rgba(7, 8, 10, 0.78), rgba(7, 8, 10, 0.9)),
        url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
    }

    .hero-veil-grid {
      position: absolute;
      inset: 0;
      pointer-events: none;
      opacity: 0.14;
      background-image:
        linear-gradient(rgba(255, 255, 255, 0.5) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.5) 1px, transparent 1px);
      background-size: 56px 56px;
    }

    .hero-category .eyebrow,
    .section-eyebrow {
      display: inline-flex;
      align-items: center;
      gap: 0.6rem;
      font-size: 0.72rem;
      letter-spacing: 0.22em;
      text-transform: uppercase;
      font-weight: 700;
      color: var(--muted);
    }

    .hero-category .eyebrow {
      color: rgba(246, 243, 236, 0.62);
    }

    .hero-category .eyebrow::before {
      content: "";
      display: block;
      width: 28px;
      height: 1px;
      background: var(--neon);
    }

    .cat-hero-title {
      font-size: clamp(2.5rem, 5vw, 4.5rem);
      font-weight: 900;
      line-height: 1.06;
      color: var(--paper);
      letter-spacing: -0.03em;
    }

    .cat-hero-sub {
      color: rgba(246, 243, 236, 0.72);
      font-size: 1.08rem;
      line-height: 1.9;
      max-width: 42ch;
    }

    .hero-info-bar {
      background: rgba(246, 243, 236, 0.96);
      border-radius: 18px;
      padding: 1.5rem 1.65rem;
      box-shadow: 0 28px 50px -42px rgba(0, 0, 0, 0.9);
    }

    .hero-info-bar .badge-warm {
      display: inline-flex;
      align-items: center;
      gap: 0.45rem;
      font-size: 0.78rem;
      font-weight: 700;
      color: #677062;
      border: 1px solid rgba(13, 14, 16, 0.12);
      background: rgba(13, 14, 16, 0.04);
      padding: 0.28rem 0.7rem;
      border-radius: 8px;
    }

    .hero-info-bar p {
      color: #1A1C1E;
      font-size: 0.98rem;
      line-height: 1.85;
    }

    .info-line-list {
      border-top: 1px solid rgba(13, 14, 16, 0.12);
    }

    .info-line-item {
      display: grid;
      grid-template-columns: auto 1fr auto;
      align-items: center;
      gap: 1.2rem;
      padding: 1.4rem 0.2rem;
      border-bottom: 1px solid var(--line);
      transition: background 0.3s ease;
    }

    .info-line-marker {
      width: 42px;
      height: 42px;
      min-width: 42px;
      border-radius: 50%;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      background: var(--ink);
      color: var(--neon);
      font-weight: 900;
      font-size: 0.9rem;
    }

    .section-gap {
      padding: 4rem 0;
    }

    @media (min-width: 768px) {
      .section-gap {
        padding: 6.5rem 0;
      }
    }

    .section-topline {
      color: var(--muted);
      font-size: 0.78rem;
      font-weight: 700;
      letter-spacing: 0.2em;
      text-transform: uppercase;
    }

    .content-wrap {
      display: grid;
      grid-template-columns: minmax(0, 1fr);
      gap: 2rem;
    }

    @media (min-width: 1024px) {
      .content-wrap {
        grid-template-columns: minmax(0, 1fr) 320px;
        gap: 4rem;
      }
    }

    .chapter {
      padding-bottom: 3.5rem;
      border-bottom: 1px solid var(--line);
    }

    .chapter:last-of-type {
      border-bottom: 0;
      padding-bottom: 0;
    }

    .chapter-num {
      display: inline-flex;
      align-items: center;
      gap: 0.6rem;
      color: var(--ink);
      font-size: 0.72rem;
      font-weight: 800;
      letter-spacing: 0.2em;
      text-transform: uppercase;
    }

    .chapter-num::before {
      content: "";
      width: 22px;
      height: 2px;
      background: var(--neon);
    }

    .chapter-title {
      margin-top: 1.1rem;
      font-size: clamp(1.7rem, 3vw, 2.3rem);
      font-weight: 900;
      line-height: 1.18;
      color: var(--ink);
      letter-spacing: -0.02em;
    }

    .chapter-lead {
      margin-top: 1.3rem;
      color: #4c5148;
      font-size: 1.02rem;
      line-height: 1.95;
      max-width: 60rem;
    }

    .docs-list {
      margin-top: 1.8rem;
      display: flex;
      flex-direction: column;
      gap: 0.75rem;
      max-width: 60rem;
    }

    .docs-row {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 1.2rem;
      width: 100%;
      padding: 1rem 1.25rem;
      border: 1px solid var(--line);
      border-radius: 14px;
      background: #FBF9F3;
      transition: background 0.3s ease, border-color 0.3s ease,
        transform 0.3s ease;
    }

    .docs-row .docs-tag {
      color: var(--muted);
      font-size: 0.82rem;
      font-weight: 700;
      letter-spacing: 0.04em;
    }

    .docs-row .docs-title {
      color: #1A1C1E;
      font-weight: 700;
      font-size: 1rem;
      transition: color 0.3s ease;
    }

    .docs-row .docs-arrow {
      color: var(--ink);
      min-width: 28px;
      display: inline-flex;
      justify-content: flex-end;
      transition: transform 0.2s ease, color 0.2s ease;
    }

    .docs-row:hover {
      background: var(--ink);
      border-color: var(--ink);
      transform: translateY(-1px);
    }

    .docs-row:hover .docs-title,
    .docs-row:hover .docs-tag {
      color: var(--paper);
    }

    .docs-row:hover .docs-arrow {
      color: var(--neon);
      transform: translateX(4px);
    }

    .aside-wrap {
      position: sticky;
      top: 108px;
    }

    .aside-card {
      border: 1px solid var(--line);
      background: var(--paper2);
      border-radius: 18px;
      padding: 1.4rem 1.2rem;
    }

    .aside-card h3 {
      font-size: 0.94rem;
      font-weight: 800;
      color: #272a28;
      letter-spacing: 0.06em;
      text-transform: uppercase;
    }

    .aside-anchor {
      display: block;
      width: 100%;
      padding: 0.72rem 0.9rem;
      border-radius: 10px;
      color: #4C514B;
      font-size: 0.96rem;
      font-weight: 500;
      transition: all 0.2s ease;
    }

    .aside-anchor:hover {
      background: var(--ink);
      color: var(--paper);
    }

    .aside-anchor.is-active {
      background: var(--ink);
      color: var(--paper);
    }

    .quick-ref-table {
      width: 100%;
      border-collapse: collapse;
      background: #FCFAF5;
      border-radius: 16px;
      overflow: hidden;
    }

    .quick-ref-table th {
      background: var(--ink);
      color: var(--paper);
      padding: 0.9rem 1.2rem;
      text-align: left;
      font-size: 0.92rem;
      font-weight: 700;
      white-space: nowrap;
    }

    .quick-ref-table td {
      padding: 1rem 1.2rem;
      border-bottom: 1px solid var(--line);
      color: #34372F;
      font-size: 0.95rem;
      line-height: 1.7;
    }

    .quick-ref-table tr:last-child td {
      border-bottom: 0;
    }

    .quick-ref-table tr {
      transition: background 0.2s ease;
    }

    .quick-ref-table tbody tr:hover {
      background: #F1EEDF;
    }

    .flow-step {
      position: relative;
      padding-left: 0;
    }

    .flow-step::before {
      content: "";
      position: absolute;
      left: 20px;
      top: 56px;
      bottom: -1.5rem;
      width: 2px;
      background: var(--line);
    }

    .flow-number {
      width: 42px;
      height: 42px;
      border-radius: 50%;
      background: var(--neon);
      color: var(--ink);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-weight: 900;
      font-size: 1rem;
    }

    .faq-wrap {
      display: grid;
      grid-template-columns: minmax(0, 1fr);
      gap: 2rem;
    }

    @media (min-width: 1024px) {
      .faq-wrap {
        grid-template-columns: 360px minmax(0, 1fr);
        gap: 4.5rem;
      }
    }

    details.faq-row {
      border-bottom: 1px solid var(--line);
      background: transparent;
      transition: background 0.2s ease;
    }

    details.faq-row summary {
      list-style: none;
      display: flex;
      justify-content: space-between;
      align-items: flex-start;
      gap: 1.2rem;
      width: 100%;
      padding: 1.4rem 0;
      cursor: pointer;
      font-weight: 700;
      font-size: 1rem;
      color: #1A1C1E;
      transition: color 0.2s ease;
    }

    details.faq-row summary::-webkit-details-marker {
      display: none;
    }

    details.faq-row summary:hover {
      color: #0d0e10;
    }

    details.faq-row .faq-icon {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      width: 36px;
      height: 36px;
      min-width: 36px;
      border-radius: 50%;
      border: 1px solid rgba(13, 14, 16, 0.16);
      color: var(--ink);
      font-size: 1.4rem;
      font-weight: 400;
      line-height: 1;
      transition: all 0.2s ease;
    }

    details[open].faq-row summary {
      color: var(--ink);
    }

    details[open].faq-row .faq-icon {
      background: var(--neon);
      border-color: var(--neon);
      transform: rotate(45deg);
    }

    details.faq-row .faq-answer {
      padding: 0 0 1.8rem;
      color: #4C514B;
      max-width: 66ch;
      line-height: 1.9;
      font-size: 0.97rem;
    }

    .cta-deep {
      background:
        radial-gradient(circle at 80% 20%, rgba(219, 245, 57, 0.12), transparent 36%),
        linear-gradient(rgba(7, 8, 10, 0.97), rgba(7, 8, 10, 0.99)),
        url('/assets/images/backpic/back-2.png') center/cover no-repeat;
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    }

    .footer-main {
      background: var(--ink);
      color: rgba(246, 243, 236, 0.8);
      border-top: 1px solid rgba(255, 255, 255, 0.06);
    }

    .footer-main h4 {
      color: var(--paper);
      font-size: 0.92rem;
      font-weight: 700;
      margin-bottom: 0.65rem;
    }

    .footer-links {
      list-style: none;
      padding: 0;
      margin: 0;
      display: flex;
      flex-direction: column;
      gap: 0.48rem;
      font-size: 0.88rem;
    }

    .footer-links a {
      color: rgba(246, 243, 236, 0.6);
      transition: color 0.2s ease;
    }

    .footer-links a:hover {
      color: var(--neon);
    }

    .footer-bottom {
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 0.6rem;
      border-top: 1px solid rgba(255, 255, 255, 0.1);
      margin-top: 2rem;
      padding: 1.3rem 0 0.4rem;
      font-size: 0.8rem;
      color: rgba(246, 243, 236, 0.4);
    }

    .site-footer-by {
      font-size: 0.78rem;
      letter-spacing: 0.04em;
    }

    @media (max-width: 520px) {
      .hero-info-bar p {
        font-size: 0.92rem;
      }

      .quick-ref-table th,
      .quick-ref-table td {
        padding: 0.8rem 0.9rem;
        font-size: 0.88rem;
      }
    }

    @media (prefers-reduced-motion: reduce) {
      *,
      *::before,
      *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
      }

      html {
        scroll-behavior: auto;
      }
    }