/* roulang page: index */
:root{
      --bg:#07111F;
      --bg2:#0A1224;
      --panel:rgba(15,23,42,.62);
      --panel-strong:rgba(15,23,42,.84);
      --text:#F8FAFC;
      --muted:#CBD5E1;
      --weak:#94A3B8;
      --border:rgba(148,163,184,.18);
      --border-bright:rgba(34,211,238,.38);
      --blue:#2563EB;
      --blue2:#1D4ED8;
      --cyan:#22D3EE;
      --teal:#14B8A6;
      --warm:#F5E7C8;
      --shadow:0 24px 80px rgba(0,0,0,.35);
      --radius-xl:28px;
      --radius:20px;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{
      margin:0;
      font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei","Noto Sans SC",Arial,sans-serif;
      color:var(--text);
      background:
        radial-gradient(circle at 12% 8%, rgba(37,99,235,.28), transparent 34%),
        radial-gradient(circle at 88% 18%, rgba(20,184,166,.18), transparent 28%),
        radial-gradient(circle at 50% 86%, rgba(34,211,238,.12), transparent 34%),
        linear-gradient(180deg,#07111F 0%,#0A1224 48%,#07111F 100%);
      line-height:1.75;
      overflow-x:hidden;
    }
    body:before{
      content:"";
      position:fixed;
      inset:0;
      pointer-events:none;
      background-image:
        linear-gradient(rgba(148,163,184,.055) 1px, transparent 1px),
        linear-gradient(90deg, rgba(148,163,184,.055) 1px, transparent 1px);
      background-size:44px 44px;
      mask-image:linear-gradient(to bottom, rgba(0,0,0,.8), rgba(0,0,0,.18), transparent);
      z-index:-1;
    }
    a{color:inherit;text-decoration:none}
    button,input,select,textarea{font:inherit}
    input,select,textarea{outline:none}
    .site-container{width:min(100% - 32px, 1240px);margin-inline:auto}
    .glass{
      background:var(--panel);
      border:1px solid rgba(255,255,255,.08);
      box-shadow:var(--shadow);
      backdrop-filter:blur(18px);
      -webkit-backdrop-filter:blur(18px);
    }
    .glass-soft{
      background:rgba(15,23,42,.46);
      border:1px solid var(--border);
      backdrop-filter:blur(14px);
      -webkit-backdrop-filter:blur(14px);
    }
    .gradient-text{
      background:linear-gradient(90deg,#F8FAFC 0%,#CFFAFE 42%,#93C5FD 100%);
      -webkit-background-clip:text;
      background-clip:text;
      color:transparent;
    }
    .btn-primary{
      display:inline-flex;align-items:center;justify-content:center;gap:.55rem;
      min-height:48px;padding:.85rem 1.35rem;border-radius:999px;
      color:white;font-weight:800;
      background:linear-gradient(135deg,var(--blue),var(--cyan),var(--teal));
      box-shadow:0 14px 38px rgba(34,211,238,.22), inset 0 1px 0 rgba(255,255,255,.22);
      transition:transform .25s ease, filter .25s ease, box-shadow .25s ease;
    }
    .btn-primary:hover{transform:translateY(-2px);filter:brightness(1.08);box-shadow:0 18px 48px rgba(34,211,238,.33)}
    .btn-primary:active{transform:translateY(0) scale(.99)}
    .btn-primary:focus-visible,.btn-secondary:focus-visible,.nav-link:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible,summary:focus-visible{
      outline:0;box-shadow:0 0 0 4px rgba(34,211,238,.24),0 0 0 1px rgba(34,211,238,.55)
    }
    .btn-secondary{
      display:inline-flex;align-items:center;justify-content:center;gap:.55rem;
      min-height:48px;padding:.85rem 1.25rem;border-radius:999px;
      border:1px solid var(--border);background:rgba(255,255,255,.045);
      color:#E2E8F0;font-weight:750;transition:background .25s ease,border-color .25s ease,transform .25s ease;
    }
    .btn-secondary:hover{background:rgba(255,255,255,.09);border-color:rgba(34,211,238,.35);transform:translateY(-2px)}
    .badge{
      display:inline-flex;align-items:center;gap:.45rem;
      border-radius:999px;border:1px solid rgba(34,211,238,.24);
      background:rgba(34,211,238,.08);color:#CFFAFE;
      padding:.36rem .72rem;font-size:.86rem;font-weight:700;
    }
    .tag{
      display:inline-flex;align-items:center;border-radius:999px;
      padding:.26rem .62rem;font-size:.78rem;color:#BAE6FD;
      background:rgba(37,99,235,.14);border:1px solid rgba(96,165,250,.18)
    }
    .card-hover{transition:transform .25s ease,border-color .25s ease,background .25s ease,box-shadow .25s ease}
    .card-hover:hover{transform:translateY(-4px);border-color:rgba(34,211,238,.38);background:rgba(15,23,42,.74);box-shadow:0 24px 70px rgba(0,0,0,.28)}
    .header-wrap{
      position:sticky;top:0;z-index:50;
      background:rgba(7,17,31,.72);
      border-bottom:1px solid rgba(148,163,184,.14);
      backdrop-filter:blur(18px);
      -webkit-backdrop-filter:blur(18px);
    }
    .brand-mark{
      width:42px;height:42px;border-radius:16px;
      background:
        radial-gradient(circle at 30% 25%, rgba(245,231,200,.95), transparent 18%),
        linear-gradient(135deg,rgba(37,99,235,1),rgba(34,211,238,.9) 52%,rgba(20,184,166,.92));
      box-shadow:0 12px 32px rgba(34,211,238,.2);
      position:relative;overflow:hidden;flex:0 0 auto;
    }
    .brand-mark:after{
      content:"";position:absolute;inset:10px;border:1px solid rgba(255,255,255,.42);border-radius:12px;
      transform:rotate(12deg)
    }
    .nav-link{
      position:relative;display:inline-flex;align-items:center;
      padding:.62rem .86rem;border-radius:999px;color:#CBD5E1;font-weight:750;font-size:.95rem;
      transition:background .25s ease,color .25s ease;
      white-space:nowrap;
    }
    .nav-link:hover{color:#F8FAFC;background:rgba(255,255,255,.06)}
    .nav-link.active{color:#E0F2FE;background:linear-gradient(90deg,rgba(37,99,235,.2),rgba(34,211,238,.11));border:1px solid rgba(34,211,238,.18)}
    .search-box{
      display:flex;align-items:center;gap:.55rem;
      min-height:42px;padding:0 .85rem;border-radius:999px;
      background:rgba(15,23,42,.74);border:1px solid var(--border);color:#94A3B8;
    }
    .search-box input{width:230px;background:transparent;border:0;color:#E2E8F0;font-size:.9rem}
    .mobile-menu{display:none}
    .hero-orb{
      position:absolute;border-radius:999px;filter:blur(18px);opacity:.75;pointer-events:none
    }
    .metric-number{font-variant-numeric:tabular-nums;font-feature-settings:"tnum";letter-spacing:-.03em}
    .dashboard-line{
      height:120px;
      background:
        linear-gradient(180deg,rgba(255,255,255,.04),transparent),
        repeating-linear-gradient(90deg,transparent 0 39px,rgba(148,163,184,.12) 40px),
        repeating-linear-gradient(0deg,transparent 0 29px,rgba(148,163,184,.08) 30px);
      border-radius:22px;position:relative;overflow:hidden;border:1px solid rgba(255,255,255,.08)
    }
    .dashboard-line svg{position:absolute;inset:0;width:100%;height:100%}
    .progress-track{height:8px;border-radius:999px;background:rgba(148,163,184,.16);overflow:hidden}
    .progress-fill{height:100%;border-radius:999px;background:linear-gradient(90deg,var(--blue),var(--cyan))}
    .compare-card ul li{display:flex;gap:.7rem;padding:.72rem 0;border-bottom:1px solid rgba(148,163,184,.1)}
    .compare-card ul li:last-child{border-bottom:0}
    details.faq-item{overflow:hidden}
    details.faq-item summary{
      cursor:pointer;list-style:none;display:flex;align-items:center;justify-content:space-between;gap:1rem;
      padding:1.1rem 1.2rem;font-weight:800;color:#F8FAFC
    }
    details.faq-item summary::-webkit-details-marker{display:none}
    details.faq-item summary:after{content:"+";width:28px;height:28px;border-radius:999px;display:grid;place-items:center;background:rgba(34,211,238,.1);color:#67E8F9;transition:transform .25s ease}
    details.faq-item[open] summary:after{content:"—";transform:rotate(180deg)}
    details.faq-item p{padding:0 1.2rem 1.15rem;color:#CBD5E1;margin:0}
    .form-field label{display:block;margin-bottom:.42rem;color:#E2E8F0;font-weight:700;font-size:.92rem}
    .form-field input,.form-field select,.form-field textarea{
      width:100%;border:1px solid rgba(148,163,184,.2);background:rgba(2,6,23,.42);
      color:#F8FAFC;border-radius:16px;padding:.85rem .95rem;transition:border-color .25s ease,box-shadow .25s ease,background .25s ease
    }
    .form-field input::placeholder,.form-field textarea::placeholder{color:#64748B}
    .form-field input:focus,.form-field select:focus,.form-field textarea:focus{border-color:rgba(34,211,238,.55);box-shadow:0 0 0 4px rgba(34,211,238,.12);background:rgba(2,6,23,.58)}
    .footer-link{display:block;color:#94A3B8;padding:.22rem 0;transition:color .2s ease,transform .2s ease}
    .footer-link:hover{color:#67E8F9;transform:translateX(3px)}
    @keyframes floaty{0%,100%{transform:translateY(0)}50%{transform:translateY(-10px)}}
    .floaty{animation:floaty 6s ease-in-out infinite}
    @media (max-width:1024px){
      .desktop-actions{display:none}
      .search-box input{width:160px}
    }
    @media (max-width:768px){
      .site-container{width:min(100% - 24px, 1240px)}
      .desktop-nav{display:none}
      .mobile-menu{display:block}
      .mobile-panel{display:none}
      .mobile-panel.open{display:block}
      .search-box{width:100%}
      .search-box input{width:100%}
      .nav-link{width:100%;justify-content:center}
    }
    @media (max-width:520px){
      .btn-primary,.btn-secondary{width:100%}
      .brand-mark{width:38px;height:38px;border-radius:14px}
      body:before{background-size:34px 34px}
    }

/* roulang page: category2 */
:root {
      --bg: #07111f;
      --bg-2: #0a1224;
      --panel: rgba(15, 23, 42, 0.64);
      --panel-strong: rgba(15, 23, 42, 0.82);
      --line: rgba(148, 163, 184, 0.18);
      --line-strong: rgba(34, 211, 238, 0.34);
      --text: #f8fafc;
      --muted: #cbd5e1;
      --subtle: #94a3b8;
      --blue: #2563eb;
      --blue-2: #1d4ed8;
      --cyan: #22d3ee;
      --teal: #14b8a6;
      --gold: #f5e7c8;
      --radius-xl: 28px;
      --radius-md: 20px;
      --shadow: 0 24px 80px rgba(0, 0, 0, .38);
      --glow: 0 0 0 1px rgba(34, 211, 238, .22), 0 22px 70px rgba(37, 99, 235, .28);
      --font: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Noto Sans SC", Arial, sans-serif;
    }

    * {
      box-sizing: border-box;
    }

    html {
      scroll-behavior: smooth;
    }

    body {
      margin: 0;
      min-height: 100vh;
      font-family: var(--font);
      line-height: 1.75;
      color: var(--text);
      background:
        radial-gradient(circle at 14% 8%, rgba(37, 99, 235, .23), transparent 32%),
        radial-gradient(circle at 86% 18%, rgba(20, 184, 166, .18), transparent 30%),
        radial-gradient(circle at 54% 76%, rgba(245, 231, 200, .08), transparent 34%),
        linear-gradient(180deg, #07111f 0%, #0b1020 44%, #07111f 100%);
      overflow-x: hidden;
    }

    body::before {
      content: "";
      position: fixed;
      inset: 0;
      pointer-events: none;
      z-index: -1;
      opacity: .34;
      background-image:
        linear-gradient(rgba(148, 163, 184, .08) 1px, transparent 1px),
        linear-gradient(90deg, rgba(148, 163, 184, .08) 1px, transparent 1px);
      background-size: 42px 42px;
      mask-image: radial-gradient(circle at center, black 0%, transparent 76%);
    }

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

    button,
    input,
    select,
    textarea {
      font: inherit;
    }

    button {
      cursor: pointer;
    }

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

    ::selection {
      color: #04111f;
      background: var(--cyan);
    }

    .site-container {
      width: min(100% - 32px, 1240px);
      margin-inline: auto;
    }

    .header-wrap {
      position: sticky;
      top: 0;
      z-index: 50;
      border-bottom: 1px solid rgba(255, 255, 255, .08);
      background: rgba(7, 17, 31, .78);
      backdrop-filter: blur(22px);
      box-shadow: 0 14px 44px rgba(0, 0, 0, .24);
    }

    .brand-mark {
      position: relative;
      width: 42px;
      height: 42px;
      flex: 0 0 auto;
      border-radius: 16px;
      background:
        radial-gradient(circle at 34% 30%, rgba(255, 255, 255, .9), transparent 10%),
        conic-gradient(from 160deg, var(--cyan), var(--blue), var(--teal), var(--cyan));
      box-shadow: 0 0 30px rgba(34, 211, 238, .28);
    }

    .brand-mark::after {
      content: "";
      position: absolute;
      inset: 9px;
      border-radius: 12px;
      border: 1px solid rgba(255, 255, 255, .42);
      background: rgba(7, 17, 31, .42);
    }

    .nav-link {
      position: relative;
      display: inline-flex;
      align-items: center;
      min-height: 42px;
      padding: 9px 14px;
      border-radius: 999px;
      color: var(--muted);
      font-size: 14px;
      font-weight: 700;
      white-space: nowrap;
      transition: color .22s ease, background .22s ease, transform .22s ease, border-color .22s ease;
    }

    .nav-link:hover {
      color: #fff;
      background: rgba(255, 255, 255, .07);
      transform: translateY(-1px);
    }

    .nav-link.active {
      color: #fff;
      background: linear-gradient(135deg, rgba(37, 99, 235, .34), rgba(34, 211, 238, .16));
      box-shadow: inset 0 0 0 1px rgba(34, 211, 238, .22);
    }

    .nav-link.active::after {
      content: "";
      position: absolute;
      left: 18px;
      right: 18px;
      bottom: 5px;
      height: 2px;
      border-radius: 999px;
      background: linear-gradient(90deg, var(--blue), var(--cyan));
    }

    .search-box {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      min-height: 42px;
      width: 280px;
      padding: 0 14px;
      border: 1px solid rgba(148, 163, 184, .18);
      border-radius: 999px;
      background: rgba(15, 23, 42, .62);
      color: var(--muted);
      transition: border-color .22s ease, box-shadow .22s ease, background .22s ease;
    }

    .search-box:focus-within {
      border-color: rgba(34, 211, 238, .62);
      box-shadow: 0 0 0 4px rgba(34, 211, 238, .12);
      background: rgba(15, 23, 42, .82);
    }

    .search-box input {
      width: 100%;
      border: 0;
      outline: 0;
      background: transparent;
      color: #fff;
      font-size: 14px;
    }

    .search-box input::placeholder {
      color: #64748b;
    }

    .tag {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      min-height: 30px;
      padding: 6px 12px;
      border: 1px solid rgba(34, 211, 238, .18);
      border-radius: 999px;
      background: rgba(34, 211, 238, .07);
      color: #a5f3fc;
      font-size: 13px;
      font-weight: 700;
      line-height: 1;
      transition: transform .22s ease, border-color .22s ease, background .22s ease;
    }

    .tag:hover {
      transform: translateY(-1px);
      border-color: rgba(34, 211, 238, .42);
      background: rgba(34, 211, 238, .12);
    }

    .btn-primary,
    .btn-secondary {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      min-height: 50px;
      padding: 13px 22px;
      border-radius: 999px;
      font-weight: 800;
      line-height: 1.15;
      transition: transform .24s ease, box-shadow .24s ease, filter .24s ease, background .24s ease, border-color .24s ease;
    }

    .btn-primary {
      color: #fff;
      background: linear-gradient(135deg, var(--blue), var(--cyan) 56%, var(--teal));
      box-shadow: 0 18px 45px rgba(37, 99, 235, .36), 0 0 0 1px rgba(255, 255, 255, .16) inset;
    }

    .btn-primary:hover {
      transform: translateY(-2px);
      filter: brightness(1.08);
      box-shadow: 0 24px 62px rgba(34, 211, 238, .28), 0 18px 48px rgba(37, 99, 235, .34);
    }

    .btn-primary:active,
    .btn-secondary:active {
      transform: translateY(0) scale(.99);
    }

    .btn-primary:focus,
    .btn-secondary:focus,
    .form-control:focus,
    summary:focus {
      outline: none;
      box-shadow: 0 0 0 4px rgba(34, 211, 238, .18), 0 0 0 1px rgba(34, 211, 238, .45);
    }

    .btn-secondary {
      border: 1px solid rgba(148, 163, 184, .22);
      color: #e2e8f0;
      background: rgba(15, 23, 42, .58);
    }

    .btn-secondary:hover {
      transform: translateY(-2px);
      border-color: rgba(34, 211, 238, .34);
      background: rgba(255, 255, 255, .08);
    }

    .mobile-menu,
    .mobile-panel {
      display: none;
    }

    .section {
      padding-block: 88px;
    }

    .section-tight {
      padding-block: 64px;
    }

    .eyebrow {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 7px 12px;
      border-radius: 999px;
      border: 1px solid rgba(245, 231, 200, .22);
      background: rgba(245, 231, 200, .06);
      color: var(--gold);
      font-size: 13px;
      font-weight: 800;
    }

    .eyebrow::before {
      content: "";
      width: 8px;
      height: 8px;
      border-radius: 999px;
      background: var(--cyan);
      box-shadow: 0 0 18px rgba(34, 211, 238, .75);
    }

    .hero {
      position: relative;
      padding: 86px 0 78px;
    }

    .hero::after {
      content: "";
      position: absolute;
      right: -120px;
      top: 40px;
      width: 460px;
      height: 460px;
      border-radius: 999px;
      background: radial-gradient(circle, rgba(34, 211, 238, .18), transparent 64%);
      pointer-events: none;
    }

    .glass {
      border: 1px solid rgba(255, 255, 255, .09);
      background: var(--panel);
      backdrop-filter: blur(18px);
      box-shadow: var(--shadow);
    }

    .card {
      border: 1px solid rgba(255, 255, 255, .09);
      border-radius: var(--radius-md);
      background: rgba(15, 23, 42, .58);
      transition: transform .24s ease, border-color .24s ease, background .24s ease, box-shadow .24s ease;
    }

    .card:hover {
      transform: translateY(-4px);
      border-color: rgba(34, 211, 238, .32);
      background: rgba(15, 23, 42, .76);
      box-shadow: 0 22px 68px rgba(0, 0, 0, .28);
    }

    .gradient-border {
      position: relative;
      isolation: isolate;
    }

    .gradient-border::before {
      content: "";
      position: absolute;
      inset: -1px;
      z-index: -1;
      border-radius: inherit;
      background: linear-gradient(135deg, rgba(34, 211, 238, .48), rgba(37, 99, 235, .08), rgba(245, 231, 200, .22));
      opacity: .72;
    }

    .metric-card {
      min-height: 132px;
      padding: 24px;
      border-radius: 24px;
      border: 1px solid rgba(255, 255, 255, .09);
      background:
        linear-gradient(180deg, rgba(255, 255, 255, .055), transparent),
        rgba(15, 23, 42, .62);
    }

    .metric-num {
      font-variant-numeric: tabular-nums;
      letter-spacing: -.04em;
      background: linear-gradient(135deg, #fff, #a5f3fc 60%, var(--gold));
      -webkit-background-clip: text;
      background-clip: text;
      color: transparent;
    }

    .flow-line {
      position: absolute;
      left: 8%;
      right: 8%;
      top: 46px;
      height: 2px;
      background: linear-gradient(90deg, rgba(37, 99, 235, .25), rgba(34, 211, 238, .75), rgba(20, 184, 166, .22));
    }

    .flow-step {
      position: relative;
      z-index: 1;
    }

    .step-dot {
      width: 54px;
      height: 54px;
      border-radius: 18px;
      display: grid;
      place-items: center;
      margin-bottom: 18px;
      color: #fff;
      font-weight: 900;
      background: linear-gradient(135deg, rgba(37, 99, 235, .95), rgba(34, 211, 238, .85));
      box-shadow: 0 16px 48px rgba(37, 99, 235, .28);
    }

    .case-card {
      overflow: hidden;
      border-radius: 28px;
      border: 1px solid rgba(255, 255, 255, .09);
      background:
        radial-gradient(circle at 20% 0%, rgba(34, 211, 238, .12), transparent 38%),
        rgba(15, 23, 42, .62);
      transition: transform .24s ease, border-color .24s ease;
    }

    .case-card:hover {
      transform: translateY(-4px);
      border-color: rgba(245, 231, 200, .28);
    }

    .compare-item {
      display: flex;
      gap: 14px;
      padding: 16px;
      border-radius: 18px;
      border: 1px solid rgba(255, 255, 255, .08);
      background: rgba(255, 255, 255, .035);
    }

    .compare-icon {
      width: 28px;
      height: 28px;
      border-radius: 999px;
      display: grid;
      place-items: center;
      flex: 0 0 auto;
      font-weight: 900;
    }

    .compare-icon.good {
      color: #042f2e;
      background: linear-gradient(135deg, #67e8f9, #2dd4bf);
    }

    .compare-icon.weak {
      color: #cbd5e1;
      background: rgba(148, 163, 184, .14);
    }

    .form-control {
      width: 100%;
      min-height: 50px;
      padding: 12px 14px;
      border-radius: 16px;
      border: 1px solid rgba(148, 163, 184, .2);
      background: rgba(2, 6, 23, .42);
      color: #fff;
      transition: border-color .22s ease, box-shadow .22s ease, background .22s ease;
    }

    .form-control::placeholder {
      color: #64748b;
    }

    .form-control:focus {
      border-color: rgba(34, 211, 238, .62);
      background: rgba(2, 6, 23, .62);
    }

    textarea.form-control {
      min-height: 120px;
      resize: vertical;
    }

    details.faq-item {
      border: 1px solid rgba(255, 255, 255, .09);
      border-radius: 20px;
      background: rgba(15, 23, 42, .56);
      overflow: hidden;
      transition: border-color .22s ease, background .22s ease;
    }

    details.faq-item:hover,
    details.faq-item[open] {
      border-color: rgba(34, 211, 238, .28);
      background: rgba(15, 23, 42, .76);
    }

    details.faq-item summary {
      list-style: none;
      cursor: pointer;
      padding: 20px 22px;
      font-weight: 800;
      color: #f8fafc;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 18px;
    }

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

    details.faq-item summary::after {
      content: "+";
      width: 28px;
      height: 28px;
      flex: 0 0 auto;
      border-radius: 999px;
      display: grid;
      place-items: center;
      color: #a5f3fc;
      background: rgba(34, 211, 238, .08);
      transition: transform .22s ease;
    }

    details.faq-item[open] summary::after {
      transform: rotate(45deg);
    }

    .faq-body {
      padding: 0 22px 22px;
      color: var(--muted);
    }

    .footer-link {
      display: block;
      width: fit-content;
      margin: 10px 0;
      color: #94a3b8;
      transition: color .22s ease, transform .22s ease;
    }

    .footer-link:hover {
      color: #a5f3fc;
      transform: translateX(3px);
    }

    .abstract-panel {
      position: relative;
      overflow: hidden;
      border-radius: 28px;
      background:
        linear-gradient(135deg, rgba(37, 99, 235, .14), rgba(34, 211, 238, .06)),
        rgba(15, 23, 42, .62);
      border: 1px solid rgba(255, 255, 255, .1);
    }

    .abstract-panel::before {
      content: "";
      position: absolute;
      inset: 22px;
      border-radius: 24px;
      border: 1px dashed rgba(34, 211, 238, .22);
      pointer-events: none;
    }

    .signal-line {
      height: 9px;
      border-radius: 999px;
      background: rgba(148, 163, 184, .14);
      overflow: hidden;
    }

    .signal-line span {
      display: block;
      height: 100%;
      border-radius: inherit;
      background: linear-gradient(90deg, var(--blue), var(--cyan), var(--teal));
      box-shadow: 0 0 26px rgba(34, 211, 238, .34);
    }

    @media (max-width: 1024px) {
      .desktop-actions {
        display: none !important;
      }

      .search-box {
        width: 240px;
      }

      .section {
        padding-block: 72px;
      }

      .flow-line {
        display: none;
      }
    }

    @media (max-width: 768px) {
      .site-container {
        width: min(100% - 24px, 1240px);
      }

      .desktop-nav {
        display: none !important;
      }

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

      .mobile-panel {
        display: none;
      }

      .mobile-panel.open {
        display: block;
      }

      .mobile-panel .nav-link {
        justify-content: flex-start;
        width: 100%;
      }

      .mobile-panel .search-box {
        width: 100%;
      }

      .hero {
        padding: 58px 0 56px;
      }

      .section,
      .section-tight {
        padding-block: 56px;
      }

      .metric-card {
        padding: 20px;
      }

      .flow-step {
        display: flex;
        gap: 16px;
      }

      .step-dot {
        margin-bottom: 0;
        flex: 0 0 auto;
      }
    }

    @media (max-width: 520px) {
      .btn-primary,
      .btn-secondary {
        width: 100%;
      }

      .hero h1 {
        font-size: 2.45rem;
      }

      .card,
      .glass,
      .case-card,
      .abstract-panel {
        border-radius: 22px;
      }

      details.faq-item summary {
        padding: 18px;
      }

      .faq-body {
        padding: 0 18px 18px;
      }
    }

/* roulang page: category1 */
:root{
      --bg:#07111f;
      --bg-2:#0a1224;
      --panel:rgba(15,23,42,.62);
      --panel-strong:rgba(15,23,42,.82);
      --line:rgba(148,163,184,.18);
      --line-strong:rgba(34,211,238,.36);
      --text:#f8fafc;
      --muted:#cbd5e1;
      --soft:#94a3b8;
      --blue:#2563eb;
      --blue-2:#1d4ed8;
      --cyan:#22d3ee;
      --teal:#14b8a6;
      --gold:#f5e7c8;
      --radius-xl:28px;
      --radius-lg:22px;
      --shadow:0 24px 80px rgba(0,0,0,.35);
      --glow:0 0 36px rgba(34,211,238,.22);
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{
      margin:0;
      font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei","Noto Sans SC",Arial,sans-serif;
      color:var(--text);
      background:
        radial-gradient(circle at 14% 8%, rgba(37,99,235,.24), transparent 34%),
        radial-gradient(circle at 82% 18%, rgba(20,184,166,.16), transparent 32%),
        linear-gradient(180deg,#07111f 0%,#0a1224 42%,#070b15 100%);
      line-height:1.75;
      overflow-x:hidden;
    }
    body:before{
      content:"";
      position:fixed;
      inset:0;
      z-index:-2;
      background-image:
        linear-gradient(rgba(255,255,255,.035) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,.035) 1px, transparent 1px);
      background-size:44px 44px;
      mask-image:linear-gradient(to bottom,rgba(0,0,0,.8),rgba(0,0,0,.18));
      pointer-events:none;
    }
    a{color:inherit;text-decoration:none}
    button,input,textarea,select{font:inherit}
    input,textarea,select{outline:none}
    ::selection{background:rgba(34,211,238,.28);color:white}
    .site-container{width:min(1180px,calc(100% - 32px));margin-inline:auto}
    .header-wrap{
      position:sticky;
      top:0;
      z-index:50;
      border-bottom:1px solid rgba(255,255,255,.08);
      background:rgba(7,17,31,.82);
      backdrop-filter:blur(18px);
      box-shadow:0 12px 38px rgba(0,0,0,.24);
    }
    .brand-mark{
      width:42px;
      height:42px;
      flex:none;
      display:inline-block;
      border-radius:16px;
      background:
        radial-gradient(circle at 30% 25%, rgba(255,255,255,.9), transparent 18%),
        conic-gradient(from 210deg, var(--cyan), var(--blue), var(--teal), var(--cyan));
      box-shadow:0 0 0 1px rgba(255,255,255,.14) inset,0 0 30px rgba(34,211,238,.24);
      position:relative;
    }
    .brand-mark:after{
      content:"";
      position:absolute;
      inset:11px;
      border:1px solid rgba(7,17,31,.72);
      border-radius:999px;
      background:rgba(7,17,31,.38);
    }
    .nav-link{
      display:inline-flex;
      align-items:center;
      justify-content:center;
      min-height:42px;
      padding:9px 14px;
      border-radius:999px;
      color:#cbd5e1;
      font-size:14px;
      font-weight:700;
      transition:.24s ease;
      white-space:nowrap;
    }
    .nav-link:hover{
      color:#fff;
      background:rgba(255,255,255,.07);
      transform:translateY(-1px);
    }
    .nav-link.active{
      color:#fff;
      background:linear-gradient(135deg,rgba(37,99,235,.95),rgba(20,184,166,.75));
      box-shadow:0 10px 28px rgba(37,99,235,.22);
    }
    .search-box{
      min-height:42px;
      display:flex;
      align-items:center;
      gap:8px;
      width:260px;
      max-width:100%;
      padding:0 13px;
      border:1px solid rgba(148,163,184,.18);
      border-radius:999px;
      background:rgba(15,23,42,.56);
      transition:.24s ease;
    }
    .search-box:focus-within{
      border-color:rgba(34,211,238,.55);
      box-shadow:0 0 0 4px rgba(34,211,238,.11);
    }
    .search-box input{
      width:100%;
      min-width:0;
      color:#f8fafc;
      background:transparent;
      font-size:14px;
    }
    .search-box input::placeholder{color:#64748b}
    .btn-primary,.btn-secondary{
      display:inline-flex;
      align-items:center;
      justify-content:center;
      gap:8px;
      min-height:50px;
      padding:12px 22px;
      border-radius:999px;
      font-weight:800;
      transition:.24s ease;
      border:1px solid transparent;
      cursor:pointer;
    }
    .btn-primary{
      color:#fff;
      background:linear-gradient(135deg,var(--blue),var(--cyan),var(--teal));
      box-shadow:0 16px 42px rgba(34,211,238,.18),0 0 0 1px rgba(255,255,255,.12) inset;
    }
    .btn-primary:hover{transform:translateY(-2px);filter:brightness(1.08);box-shadow:0 22px 58px rgba(34,211,238,.26)}
    .btn-primary:active,.btn-secondary:active{transform:translateY(0) scale(.98)}
    .btn-primary:focus-visible,.btn-secondary:focus-visible,.nav-link:focus-visible,.footer-link:focus-visible{
      outline:none;
      box-shadow:0 0 0 4px rgba(34,211,238,.22);
    }
    .btn-secondary{
      color:#e2e8f0;
      background:rgba(255,255,255,.045);
      border-color:rgba(148,163,184,.2);
    }
    .btn-secondary:hover{background:rgba(255,255,255,.08);border-color:rgba(34,211,238,.32);transform:translateY(-1px)}
    .tag{
      display:inline-flex;
      align-items:center;
      min-height:30px;
      padding:5px 11px;
      border-radius:999px;
      font-size:13px;
      font-weight:700;
      color:#bff7ff;
      border:1px solid rgba(34,211,238,.22);
      background:rgba(34,211,238,.08);
      white-space:nowrap;
      transition:.22s ease;
    }
    .tag:hover{border-color:rgba(34,211,238,.5);background:rgba(34,211,238,.13)}
    .mobile-menu,.mobile-panel{display:none}
    .section{padding:88px 0}
    .section-sm{padding:64px 0}
    .glass-card{
      border:1px solid rgba(255,255,255,.09);
      border-radius:var(--radius-xl);
      background:var(--panel);
      backdrop-filter:blur(18px);
      box-shadow:var(--shadow);
    }
    .card{
      border:1px solid rgba(255,255,255,.08);
      border-radius:24px;
      background:rgba(15,23,42,.56);
      transition:.26s ease;
    }
    .card:hover{
      transform:translateY(-4px);
      border-color:rgba(34,211,238,.28);
      background:rgba(15,23,42,.74);
      box-shadow:0 20px 58px rgba(0,0,0,.24);
    }
    .eyebrow{
      display:inline-flex;
      align-items:center;
      gap:8px;
      color:#bff7ff;
      background:rgba(34,211,238,.08);
      border:1px solid rgba(34,211,238,.22);
      border-radius:999px;
      padding:7px 12px;
      font-size:13px;
      font-weight:800;
    }
    .hero-title{
      font-size:clamp(34px,6vw,64px);
      line-height:1.1;
      letter-spacing:-.045em;
      font-weight:900;
    }
    .gradient-text{
      background:linear-gradient(135deg,#fff 0%,#dff7ff 42%,#73f2ff 72%,#f5e7c8 100%);
      -webkit-background-clip:text;
      background-clip:text;
      color:transparent;
    }
    .section-title{
      font-size:clamp(28px,4vw,42px);
      line-height:1.18;
      letter-spacing:-.035em;
      font-weight:900;
    }
    .muted{color:var(--muted)}
    .soft{color:var(--soft)}
    .number-badge{
      width:42px;
      height:42px;
      display:inline-flex;
      align-items:center;
      justify-content:center;
      border-radius:15px;
      color:#ecfeff;
      font-weight:900;
      background:linear-gradient(135deg,rgba(37,99,235,.9),rgba(20,184,166,.7));
      box-shadow:0 0 28px rgba(34,211,238,.18);
    }
    .topic-large{
      min-height:430px;
      overflow:hidden;
      position:relative;
    }
    .topic-large:after{
      content:"";
      position:absolute;
      width:280px;
      height:280px;
      right:-90px;
      bottom:-80px;
      border-radius:50%;
      background:radial-gradient(circle,rgba(34,211,238,.22),transparent 68%);
    }
    .quality-radar{
      height:190px;
      border-radius:24px;
      border:1px solid rgba(34,211,238,.14);
      background:
        radial-gradient(circle at center, rgba(34,211,238,.22) 0 2px, transparent 3px),
        radial-gradient(circle at center, transparent 0 30px, rgba(34,211,238,.16) 31px 32px, transparent 33px 62px, rgba(37,99,235,.16) 63px 64px, transparent 65px),
        linear-gradient(135deg,rgba(37,99,235,.12),rgba(20,184,166,.08));
      position:relative;
    }
    .quality-radar:before{
      content:"";
      position:absolute;
      inset:22px;
      border-radius:50%;
      border:1px dashed rgba(245,231,200,.22);
      animation:spin 16s linear infinite;
    }
    .quality-radar:after{
      content:"";
      position:absolute;
      left:50%;
      top:50%;
      width:44%;
      height:2px;
      transform-origin:left center;
      background:linear-gradient(90deg,rgba(34,211,238,.85),transparent);
      animation:spin 7s linear infinite;
    }
    @keyframes spin{to{transform:rotate(360deg)}}
    .dimension-line{
      position:relative;
    }
    .dimension-line:before{
      content:"";
      position:absolute;
      top:0;
      bottom:0;
      left:21px;
      width:1px;
      background:linear-gradient(to bottom,rgba(34,211,238,.55),rgba(37,99,235,.12));
    }
    .dimension-item{
      position:relative;
      display:grid;
      grid-template-columns:56px 1fr;
      gap:18px;
      padding:0 0 28px;
    }
    .dimension-item:last-child{padding-bottom:0}
    .progress-bar{
      height:8px;
      overflow:hidden;
      border-radius:999px;
      background:rgba(148,163,184,.14);
    }
    .progress-bar span{
      display:block;
      height:100%;
      border-radius:999px;
      background:linear-gradient(90deg,var(--blue),var(--cyan),var(--teal));
      box-shadow:0 0 20px rgba(34,211,238,.26);
    }
    .article-card{
      display:grid;
      gap:12px;
      padding:22px;
      border:1px solid rgba(255,255,255,.08);
      border-radius:22px;
      background:rgba(15,23,42,.46);
      transition:.24s ease;
    }
    .article-card:hover{
      border-color:rgba(34,211,238,.32);
      background:rgba(15,23,42,.7);
      transform:translateY(-3px);
    }
    .article-card:hover h3{color:#67e8f9}
    .side-box{
      border:1px solid rgba(255,255,255,.08);
      border-radius:24px;
      background:rgba(15,23,42,.54);
      padding:22px;
    }
    details{
      border:1px solid rgba(255,255,255,.08);
      border-radius:22px;
      background:rgba(15,23,42,.48);
      padding:18px 20px;
      transition:.24s ease;
    }
    details:hover{border-color:rgba(34,211,238,.28);background:rgba(15,23,42,.66)}
    summary{
      list-style:none;
      cursor:pointer;
      font-weight:800;
      color:#f8fafc;
      display:flex;
      align-items:center;
      justify-content:space-between;
      gap:16px;
    }
    summary::-webkit-details-marker{display:none}
    summary:after{
      content:"+";
      width:28px;
      height:28px;
      border-radius:999px;
      display:inline-flex;
      align-items:center;
      justify-content:center;
      flex:none;
      color:#67e8f9;
      background:rgba(34,211,238,.08);
      border:1px solid rgba(34,211,238,.2);
    }
    details[open] summary:after{content:"−"}
    details p{margin-top:12px;color:#cbd5e1}
    .form-control{
      width:100%;
      min-height:50px;
      border:1px solid rgba(148,163,184,.18);
      border-radius:16px;
      background:rgba(2,6,23,.36);
      color:#f8fafc;
      padding:12px 14px;
      transition:.22s ease;
    }
    textarea.form-control{min-height:118px;resize:vertical}
    .form-control::placeholder{color:#64748b}
    .form-control:focus{
      border-color:rgba(34,211,238,.58);
      box-shadow:0 0 0 4px rgba(34,211,238,.11);
      background:rgba(2,6,23,.48);
    }
    .footer-link{
      display:block;
      width:max-content;
      max-width:100%;
      color:#94a3b8;
      margin:10px 0;
      transition:.22s ease;
    }
    .footer-link:hover{color:#67e8f9;transform:translateX(3px)}
    .breadcrumb a{color:#94a3b8}
    .breadcrumb a:hover{color:#67e8f9}
    @media (max-width:1024px){
      .desktop-actions{display:none!important}
      .search-box{width:100%}
      .section{padding:72px 0}
    }
    @media (max-width:768px){
      .desktop-nav{display:none!important}
      .mobile-menu{display:inline-flex}
      .mobile-panel{display:none}
      .mobile-panel.open{display:block}
      .site-container{width:min(100% - 24px,1180px)}
      .hero-title{font-size:38px}
      .section{padding:56px 0}
      .section-sm{padding:44px 0}
      .glass-card,.card{border-radius:22px}
      .dimension-item{grid-template-columns:48px 1fr;gap:14px}
      .dimension-line:before{left:20px}
    }
    @media (max-width:520px){
      .btn-primary,.btn-secondary{width:100%}
      .topic-large{min-height:auto}
      .hero-title{font-size:34px}
    }