/* roulang page: index */
:root{
  --primary:#0f1b2d;
  --primary-2:#13243c;
  --accent:#f5a623;
  --accent-2:#00c8a8;
  --bg:#f6f8fb;
  --card:#ffffff;
  --text:#1c2b3a;
  --muted:#5f6f80;
  --border:#e5eaf0;
  --radius:16px;
  --shadow:0 8px 30px rgba(15,27,45,.08);
  --shadow-lg:0 20px 50px rgba(15,27,45,.15);
  --nav-width:248px;
  --space:100px;
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:"PingFang SC","Microsoft YaHei","Segoe UI",Roboto,sans-serif;background:var(--bg);color:var(--text);line-height:1.7;font-size:16px}
a{text-decoration:none;color:inherit}
img{max-width:100%;height:auto;display:block}
button{background:none;border:none;font-family:inherit;cursor:pointer}
ul,ol{list-style:none}
.container{max-width:1180px;margin:0 auto;padding:0 32px}
.app{display:flex;min-height:100vh}
.sidebar{width:var(--nav-width);position:fixed;inset:0 auto 0 0;background:var(--primary);color:#fff;z-index:200;display:flex;flex-direction:column;transition:transform .3s ease}
.sidebar-inner{display:flex;flex-direction:column;flex:1;padding:28px 18px;overflow-y:auto}
.logo{display:flex;align-items:center;gap:10px;padding:0 8px 30px;border-bottom:1px solid rgba(255,255,255,.1)}
.logo-mark{width:38px;height:38px;border-radius:12px;background:linear-gradient(135deg,var(--accent),#ff7a00);display:flex;align-items:center;justify-content:center;font-weight:800;font-size:18px;color:#fff;flex-shrink:0}
.logo-text{font-weight:700;font-size:16px;letter-spacing:.5px;white-space:nowrap}
.nav{display:flex;flex-direction:column;gap:6px;margin-top:28px}
.nav-link{display:flex;align-items:center;gap:12px;padding:11px 14px;border-radius:12px;color:rgba(255,255,255,.72);font-size:15px;font-weight:500;transition:all .2s ease}
.nav-link:hover{background:rgba(255,255,255,.08);color:#fff}
.nav-link.active{background:var(--accent);color:var(--primary);font-weight:700;box-shadow:0 8px 18px rgba(245,166,35,.3)}
.sidebar-foot{margin-top:auto;padding:20px 8px 0;border-top:1px solid rgba(255,255,255,.1)}
.sidebar-stat{background:rgba(255,255,255,.06);border-radius:16px;padding:16px;text-align:center}
.stat-num{font-size:28px;font-weight:800;color:var(--accent-2);line-height:1.2;display:block}
.stat-label{font-size:13px;color:rgba(255,255,255,.7)}
.main{flex:1;margin-left:var(--nav-width);display:flex;flex-direction:column;min-height:100vh}
.topbar{display:none;position:sticky;top:0;z-index:120;height:60px;background:#fff;border-bottom:1px solid var(--border);align-items:center;justify-content:space-between;padding:0 20px}
.menu-toggle{display:inline-flex;align-items:center;justify-content:center;width:38px;height:38px;border-radius:10px;background:var(--bg);font-size:20px;color:var(--text)}
.mobile-brand{font-weight:700;font-size:16px;color:var(--text)}
.sidebar-backdrop{display:none}
a:focus-visible{outline:3px solid rgba(245,166,35,.5);outline-offset:2px}
.btn:focus-visible{outline:3px solid rgba(245,166,35,.5);outline-offset:2px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:12px 26px;border-radius:12px;font-weight:600;font-size:15px;cursor:pointer;transition:all .25s ease;border:2px solid transparent;white-space:nowrap}
.btn-primary{background:var(--accent);color:var(--primary);box-shadow:0 8px 20px rgba(245,166,35,.25)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 12px 28px rgba(245,166,35,.35)}
.btn-ghost{background:transparent;border-color:rgba(255,255,255,.4);color:#fff}
.btn-ghost:hover{background:rgba(255,255,255,.1);border-color:#fff}
.btn-light{background:#fff;color:var(--primary);border-color:#fff}
.btn-light:hover{transform:translateY(-2px);box-shadow:var(--shadow)}
.btn-sm{padding:8px 18px;font-size:14px;border-radius:10px}
.section{padding:var(--space) 0}
.section-head{max-width:720px;margin-bottom:52px}
.section-head.center{margin-left:auto;margin-right:auto;text-align:center}
.section-head.light h2,.section-head.light p{color:#fff}
.section-tag{display:inline-block;background:rgba(245,166,35,.12);color:var(--accent);font-weight:600;font-size:13px;padding:6px 14px;border-radius:999px;margin-bottom:16px;letter-spacing:.5px}
h2{font-size:34px;line-height:1.3;font-weight:700;color:var(--text)}
.section-head p{color:var(--muted);font-size:16px;margin-top:14px}
.hero{position:relative;padding:110px 0 110px;overflow:hidden}
.hero-bg{position:absolute;inset:0;background-size:cover;background-position:center}
.hero-overlay{position:absolute;inset:0;background:linear-gradient(100deg,rgba(15,27,45,.92) 0%,rgba(15,27,45,.72) 45%,rgba(15,27,45,.35) 100%)}
.hero-content{position:relative;z-index:2;max-width:720px}
.hero-badge{display:inline-block;background:rgba(0,200,168,.15);border:1px solid rgba(0,200,168,.4);color:var(--accent-2);padding:6px 16px;border-radius:999px;font-size:13px;font-weight:600;margin-bottom:24px}
.hero h1{font-size:50px;line-height:1.2;color:#fff;font-weight:800;margin-bottom:20px}
.hero p{font-size:18px;color:rgba(255,255,255,.8);max-width:560px;margin-bottom:32px}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap}
.hero-metrics{display:flex;gap:36px;margin-top:48px;padding-top:32px;border-top:1px solid rgba(255,255,255,.15)}
.hero-metrics div strong{font-size:28px;color:#fff;display:block}
.hero-metrics div span{color:rgba(255,255,255,.65);font-size:14px}
.stats-bar{background:var(--card);border-bottom:1px solid var(--border);padding:32px 0}
.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.stat-item{text-align:center;padding:12px}
.stat-item strong{font-size:32px;font-weight:800;color:var(--primary);display:block}
.stat-item span{color:var(--muted);font-size:14px}
.feature-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:28px}
.feature-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;transition:transform .3s,box-shadow .3s}
.feature-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-lg)}
.feature-card img{width:100%;height:220px;object-fit:cover}
.feature-card .body{padding:24px}
.feature-card h3{margin-bottom:10px;font-size:20px}
.feature-card p{color:var(--muted);font-size:15px}
.section-dark{background:var(--primary);color:#fff}
.category-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:28px}
.category-card{position:relative;display:flex;align-items:flex-end;min-height:260px;border-radius:20px;overflow:hidden;background-size:cover;background-position:center;padding:28px;box-shadow:inset 0 -80px 80px rgba(0,0,0,.35);transition:transform .3s}
.category-card:hover{transform:translateY(-8px)}
.category-card .info{position:relative;z-index:2}
.category-card .info h3{color:#fff;font-size:22px;margin-bottom:6px}
.category-card .info p{color:rgba(255,255,255,.8);font-size:14px}
.category-card .arrow{position:absolute;top:24px;right:24px;width:40px;height:40px;background:rgba(255,255,255,.2);border-radius:50%;display:flex;align-items:center;justify-content:center;color:#fff;font-size:18px}
.news-list{display:flex;flex-direction:column;gap:18px}
.news-item{display:block;background:var(--card);border:1px solid var(--border);border-radius:16px;padding:24px 28px;transition:all .25s}
.news-item:hover{border-color:var(--accent);box-shadow:var(--shadow);transform:translateX(6px)}
.news-meta{display:flex;gap:16px;align-items:center;margin-bottom:10px}
.news-cat{background:rgba(0,200,168,.1);color:#008f7a;font-size:12px;font-weight:600;padding:4px 10px;border-radius:99px}
.news-meta time{color:var(--muted);font-size:13px}
.news-item h3{font-size:19px;margin-bottom:6px}
.news-item p{color:var(--muted);font-size:14px;line-height:1.6}
.empty-tip{background:var(--card);border:1px dashed var(--border);padding:40px;text-align:center;color:var(--muted);border-radius:16px;font-size:15px}
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:30px}
.step{background:var(--card);border:1px solid var(--border);border-radius:20px;padding:30px;position:relative}
.step-num{font-size:40px;font-weight:800;color:rgba(245,166,35,.25);line-height:1;display:block;margin-bottom:16px}
.step h3{font-size:18px;margin-bottom:8px}
.step p{color:var(--muted);font-size:15px}
.faq-list{max-width:820px;margin:0 auto;display:flex;flex-direction:column;gap:16px}
.faq-item{background:var(--card);border:1px solid var(--border);border-radius:16px;overflow:hidden}
.faq-item summary{cursor:pointer;padding:22px 26px;font-weight:600;font-size:16px;display:flex;align-items:center;justify-content:space-between;list-style:none}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{content:"+";font-size:24px;color:var(--accent);transition:transform .2s}
.faq-item[open] summary::after{content:"−"}
.faq-item p{padding:0 26px 22px;color:var(--muted);font-size:15px}
.cta{background:var(--primary);margin:0 32px 80px;border-radius:28px;padding:64px 48px;text-align:center;position:relative;overflow:hidden}
.cta-inner{position:relative;z-index:2;max-width:640px;margin:0 auto}
.cta h2{color:#fff;font-size:34px;margin-bottom:16px}
.cta p{color:rgba(255,255,255,.75);margin-bottom:30px}
.cta .btn{margin:0 4px}
.footer{background:var(--primary);color:#fff}
.footer-inner{max-width:1180px;margin:0 auto;padding:56px 32px 32px;display:grid;grid-template-columns:1.5fr 2fr;gap:40px}
.footer-brand p{color:rgba(255,255,255,.6);font-size:14px;margin-top:12px}
.footer-links{display:grid;grid-template-columns:1fr 1fr;gap:32px}
.footer-col h4{font-size:15px;margin-bottom:16px;color:#fff}
.footer-col a{display:block;color:rgba(255,255,255,.6);font-size:14px;padding:5px 0;transition:color .2s}
.footer-col a:hover{color:var(--accent)}
.footer-bottom{border-top:1px solid rgba(255,255,255,.1);text-align:center;padding:20px;color:rgba(255,255,255,.45);font-size:13px}
@media(max-width:1024px){
  :root{--space:72px}
  .hero h1{font-size:40px}
  h2{font-size:30px}
  .category-grid{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:768px){
  .sidebar{transform:translateX(-100%)}
  .sidebar.open{transform:translateX(0)}
  .sidebar-backdrop{display:block;position:fixed;inset:0;background:rgba(15,27,45,.5);z-index:180;opacity:0;pointer-events:none;transition:opacity .3s}
  .sidebar-backdrop.show{opacity:1;pointer-events:auto}
  .main{margin-left:0}
  .topbar{display:flex}
  .footer-inner{grid-template-columns:1fr}
  .stats-grid{grid-template-columns:repeat(2,1fr)}
  .feature-grid,.category-grid,.steps{grid-template-columns:1fr}
  .hero{padding:70px 0}
  .hero h1{font-size:32px}
  .cta{margin:0 20px 48px;padding:40px 24px}
}
@media(max-width:520px){
  body{font-size:15px}
  .container{padding:0 20px}
  .section{padding:48px 0}
  .section-head h2{font-size:24px}
  .hero-metrics{flex-direction:column;gap:20px}
  .stats-grid{grid-template-columns:1fr 1fr;gap:10px}
  .hero h1{font-size:28px}
  .hero p{font-size:16px}
  .news-item{padding:18px 20px}
  .faq-item summary{padding:18px 20px;font-size:15px}
  .footer-inner{padding:40px 20px 24px}
}

/* roulang page: category1 */
:root {
      --primary: #4f46e5;
      --primary-dark: #3730a3;
      --secondary: #06b6d4;
      --accent: #f59e0b;
      --dark: #0b1220;
      --dark-2: #111c33;
      --bg: #f7f8fc;
      --surface: #ffffff;
      --text: #111827;
      --text-weak: #6b7280;
      --border: #e5e7eb;
      --radius: 18px;
      --radius-sm: 12px;
      --shadow-sm: 0 4px 14px rgba(2, 6, 23, 0.06);
      --shadow: 0 18px 44px rgba(2, 6, 23, 0.1);
      --space-section: 90px;
      --font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
    }

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

    html {
      scroll-behavior: smooth;
    }

    body {
      font-family: var(--font-family);
      background: var(--bg);
      color: var(--text);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
    }

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

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

    button,
    input,
    textarea {
      font-family: inherit;
      outline: none;
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* Header */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(255, 255, 255, 0.94);
      backdrop-filter: blur(14px);
      border-bottom: 1px solid var(--border);
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }

    .logo {
      display: inline-flex;
      align-items: center;
      gap: 10px;
      font-weight: 700;
      font-size: 18px;
      color: var(--text);
    }

    .logo-mark {
      width: 38px;
      height: 38px;
      border-radius: 10px;
      background: linear-gradient(135deg, var(--primary), var(--secondary));
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 18px;
      font-weight: 800;
      box-shadow: 0 6px 16px rgba(79, 70, 229, 0.32);
    }

    .logo-text {
      font-size: 18px;
      font-weight: 700;
      letter-spacing: 0.2px;
    }

    .nav {
      display: flex;
      align-items: center;
      gap: 4px;
    }

    .nav-link {
      display: inline-block;
      padding: 9px 16px;
      border-radius: 999px;
      font-size: 14px;
      font-weight: 500;
      color: var(--text-weak);
      transition: all 0.22s ease;
    }

    .nav-link:hover {
      color: var(--primary);
      background: rgba(79, 70, 229, 0.08);
    }

    .nav-link.active {
      color: var(--primary);
      background: rgba(79, 70, 229, 0.1);
      font-weight: 600;
    }

    .nav-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 22px;
      color: var(--text);
      cursor: pointer;
      padding: 8px;
      border-radius: 10px;
    }

    /* Hero */
    .page-hero {
      position: relative;
      padding: 120px 0 140px;
      background: url('/assets/images/backpic/back-2.png') center center / cover no-repeat;
      color: #fff;
      overflow: hidden;
    }

    .hero-overlay {
      position: absolute;
      inset: 0;
      background: linear-gradient(105deg, rgba(6, 8, 20, 0.95) 20%, rgba(15, 23, 42, 0.82) 60%, rgba(20, 18, 68, 0.72));
    }

    .hero-content {
      position: relative;
      z-index: 2;
    }

    .breadcrumb {
      font-size: 14px;
      color: rgba(255, 255, 255, 0.7);
      margin-bottom: 22px;
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .breadcrumb a {
      color: rgba(255, 255, 255, 0.9);
    }

    .breadcrumb span {
      opacity: 0.5;
    }

    .hero-content h1 {
      font-size: 46px;
      line-height: 1.25;
      font-weight: 800;
      margin-bottom: 20px;
      max-width: 700px;
    }

    .hero-content p {
      font-size: 17px;
      color: rgba(255, 255, 255, 0.82);
      max-width: 640px;
      margin-bottom: 32px;
    }

    .hero-actions {
      display: flex;
      flex-wrap: wrap;
      gap: 14px;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 13px 26px;
      border-radius: 12px;
      font-weight: 600;
      font-size: 15px;
      border: none;
      cursor: pointer;
      transition: all 0.25s ease;
    }

    .btn-primary {
      background: var(--primary);
      color: #fff;
      box-shadow: 0 8px 22px rgba(79, 70, 229, 0.36);
    }

    .btn-primary:hover {
      background: var(--primary-dark);
      transform: translateY(-2px);
      box-shadow: 0 12px 28px rgba(79, 70, 229, 0.44);
    }

    .btn-ghost {
      background: rgba(255, 255, 255, 0.08);
      border: 1px solid rgba(255, 255, 255, 0.35);
      color: #fff;
      backdrop-filter: blur(4px);
    }

    .btn-ghost:hover {
      background: rgba(255, 255, 255, 0.16);
      transform: translateY(-2px);
    }

    /* Metrics */
    .metrics {
      background: var(--dark);
      padding: 48px 0;
      position: relative;
      z-index: 3;
      margin-top: -40px;
      border-radius: 24px;
      max-width: 1200px;
      margin-left: auto;
      margin-right: auto;
      box-shadow: var(--shadow);
    }

    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      padding: 0 24px;
    }

    .metric-card {
      background: rgba(255, 255, 255, 0.06);
      border: 1px solid rgba(255, 255, 255, 0.08);
      border-radius: 16px;
      padding: 30px 20px;
      text-align: center;
      transition: all 0.3s ease;
    }

    .metric-card:hover {
      background: rgba(255, 255, 255, 0.1);
      transform: translateY(-4px);
    }

    .metric-num {
      font-size: 40px;
      font-weight: 800;
      color: #fff;
      line-height: 1.2;
      margin-bottom: 6px;
    }

    .metric-label {
      color: #94a3b8;
      font-size: 14px;
      font-weight: 500;
    }

    /* Section base */
    .section {
      padding: var(--space-section) 0;
    }

    .section-head {
      text-align: center;
      max-width: 700px;
      margin: 0 auto 56px;
    }

    .section-tag {
      display: inline-block;
      background: rgba(79, 70, 229, 0.09);
      color: var(--primary);
      border-radius: 999px;
      padding: 6px 16px;
      font-size: 13px;
      font-weight: 700;
      letter-spacing: 0.6px;
      margin-bottom: 16px;
    }

    .section-head h2 {
      font-size: 34px;
      line-height: 1.3;
      font-weight: 800;
      margin-bottom: 12px;
    }

    .section-head p {
      color: var(--text-weak);
      font-size: 16px;
    }

    /* Entry cards */
    .cards-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 26px;
    }

    .entry-card {
      background: var(--surface);
      border: 1px solid var(--border);
      border-radius: var(--radius);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
      display: flex;
      flex-direction: column;
    }

    .entry-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow);
      border-color: rgba(79, 70, 229, 0.28);
    }

    .entry-card .card-img {
      width: 100%;
      height: 210px;
      object-fit: cover;
    }

    .card-body {
      padding: 28px;
      flex: 1;
      display: flex;
      flex-direction: column;
    }

    .card-body .card-icon {
      width: 44px;
      height: 44px;
      border-radius: 12px;
      background: linear-gradient(135deg, rgba(79, 70, 229, 0.12), rgba(6, 182, 212, 0.12));
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary);
      font-size: 18px;
      margin-bottom: 16px;
    }

    .card-body h3 {
      font-size: 20px;
      font-weight: 700;
      margin-bottom: 8px;
    }

    .card-body p {
      color: var(--text-weak);
      font-size: 15px;
      flex: 1;
    }

    .card-list {
      list-style: none;
      margin: 16px 0 0;
      display: grid;
      gap: 6px;
    }

    .card-list li {
      font-size: 14px;
      color: var(--text);
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .card-list li i {
      color: var(--secondary);
      font-size: 13px;
    }

    .card-link {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      margin-top: 18px;
      font-size: 14px;
      font-weight: 600;
      color: var(--primary);
      transition: gap 0.2s ease;
    }

    .card-link:hover {
      gap: 12px;
    }

    /* Steps */
    .steps-section {
      background: var(--surface);
      border-top: 1px solid var(--border);
      border-bottom: 1px solid var(--border);
    }

    .steps-grid {
      display: grid;
      grid-template-columns: repeat(5, 1fr);
      gap: 18px;
    }

    .step-card {
      background: var(--bg);
      border: 1px solid var(--border);
      border-radius: 16px;
      padding: 30px 18px;
      text-align: center;
      transition: all 0.3s ease;
      position: relative;
    }

    .step-card:hover {
      background: #fff;
      box-shadow: var(--shadow-sm);
      transform: translateY(-4px);
    }

    .step-num {
      width: 46px;
      height: 46px;
      margin: 0 auto 16px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--primary), var(--secondary));
      color: #fff;
      font-weight: 800;
      font-size: 18px;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 8px 18px rgba(79, 70, 229, 0.28);
    }

    .step-card h3 {
      font-size: 16px;
      font-weight: 700;
      margin-bottom: 8px;
    }

    .step-card p {
      font-size: 13px;
      color: var(--text-weak);
      line-height: 1.6;
    }

    /* Support */
    .support-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 64px;
      align-items: center;
    }

    .support-visual img {
      width: 100%;
      border-radius: 22px;
      box-shadow: var(--shadow);
    }

    .support-content h2 {
      font-size: 30px;
      font-weight: 800;
      line-height: 1.3;
      margin-bottom: 16px;
    }

    .support-content p {
      color: var(--text-weak);
      margin-bottom: 28px;
    }

    .progress-list {
      display: grid;
      gap: 20px;
    }

    .progress-item .progress-label {
      display: flex;
      justify-content: space-between;
      font-size: 14px;
      font-weight: 600;
      margin-bottom: 8px;
    }

    .progress-bar {
      height: 9px;
      background: #e9edf3;
      border-radius: 999px;
      overflow: hidden;
    }

    .progress-fill {
      height: 100%;
      width: 0;
      border-radius: 999px;
      background: linear-gradient(90deg, var(--primary), var(--secondary));
    }

    .progress-fill.chrome { width: 100%; }
    .progress-fill.edge { width: 98%; }
    .progress-fill.safari { width: 96%; }
    .progress-fill.firefox { width: 93%; }

    /* FAQ */
    .faq-section {
      background: var(--surface);
      border-top: 1px solid var(--border);
    }

    .faq-list {
      max-width: 840px;
      margin: 0 auto;
      display: grid;
      gap: 14px;
    }

    .faq-item {
      background: var(--bg);
      border: 1px solid var(--border);
      border-radius: 14px;
      padding: 0 22px;
      transition: border-color 0.2s ease, background 0.2s ease;
    }

    .faq-item:hover {
      border-color: rgba(79, 70, 229, 0.25);
      background: #fff;
    }

    .faq-item summary {
      cursor: pointer;
      list-style: none;
      padding: 18px 0;
      font-size: 16px;
      font-weight: 600;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 16px;
    }

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

    .faq-item summary::after {
      content: "\f078";
      font-family: "Font Awesome 6 Free";
      font-weight: 900;
      font-size: 13px;
      color: var(--text-weak);
      transition: transform 0.25s ease;
    }

    .faq-item[open] summary {
      border-bottom: 1px solid var(--border);
    }

    .faq-item[open] summary::after {
      transform: rotate(180deg);
      color: var(--primary);
    }

    .faq-item p {
      padding: 14px 0 20px;
      color: var(--text-weak);
      font-size: 15px;
    }

    /* CTA */
    .cta-section {
      background: linear-gradient(120deg, #14102e, #312e81 45%, #0e7490);
      padding: 84px 0;
      color: #fff;
      text-align: center;
      position: relative;
      overflow: hidden;
    }

    .cta-section::before {
      content: "";
      position: absolute;
      top: -60%;
      right: -20%;
      width: 420px;
      height: 420px;
      background: radial-gradient(circle, rgba(6, 182, 212, 0.22), transparent 70%);
    }

    .cta-inner {
      position: relative;
      z-index: 2;
      max-width: 680px;
      margin: 0 auto;
    }

    .cta-inner h2 {
      font-size: 32px;
      font-weight: 800;
      margin-bottom: 14px;
    }

    .cta-inner p {
      color: rgba(255, 255, 255, 0.8);
      margin-bottom: 28px;
    }

    .cta-actions {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 14px;
    }

    .btn-light {
      background: #fff;
      color: var(--primary);
      box-shadow: 0 10px 24px rgba(0, 0, 0, 0.18);
    }

    .btn-light:hover {
      transform: translateY(-2px);
      box-shadow: 0 14px 30px rgba(0, 0, 0, 0.22);
    }

    .btn-outline-light {
      background: transparent;
      border: 1.5px solid rgba(255, 255, 255, 0.7);
      color: #fff;
    }

    .btn-outline-light:hover {
      background: rgba(255, 255, 255, 0.14);
      transform: translateY(-2px);
    }

    /* Footer */
    .footer {
      background: var(--dark);
      color: #94a3b8;
      padding: 70px 0 0;
    }

    .footer-inner {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
      display: grid;
      grid-template-columns: 1.4fr 1fr;
      gap: 64px;
    }

    .footer-brand p {
      margin-top: 18px;
      font-size: 14px;
      line-height: 1.8;
      max-width: 380px;
    }

    .footer .logo .logo-text {
      color: #fff;
    }

    .footer-links {
      display: flex;
      gap: 48px;
      justify-content: flex-end;
    }

    .footer-col {
      display: flex;
      flex-direction: column;
      gap: 11px;
    }

    .footer-col h4 {
      color: #e2e8f0;
      font-size: 15px;
      margin-bottom: 6px;
    }

    .footer-col a {
      color: #94a3b8;
      font-size: 14px;
      transition: color 0.2s ease;
    }

    .footer-col a:hover {
      color: #fff;
    }

    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      margin-top: 64px;
      padding: 22px 24px;
      text-align: center;
      font-size: 13px;
      color: #64748b;
    }

    /* Responsive */
    @media (max-width: 1024px) {
      :root {
        --space-section: 70px;
      }

      .cards-grid {
        grid-template-columns: repeat(2, 1fr);
      }

      .steps-grid {
        grid-template-columns: repeat(3, 1fr);
      }

      .support-grid {
        grid-template-columns: 1fr;
        gap: 40px;
      }

      .support-visual {
        order: 2;
      }

      .metrics-grid {
        grid-template-columns: repeat(2, 1fr);
      }

      .footer-inner {
        grid-template-columns: 1fr;
        gap: 40px;
      }

      .footer-links {
        justify-content: flex-start;
      }
    }

    @media (max-width: 768px) {
      .nav-toggle {
        display: block;
      }

      .nav {
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #fff;
        flex-direction: column;
        align-items: stretch;
        padding: 16px 20px;
        gap: 6px;
        border-bottom: 1px solid var(--border);
        box-shadow: 0 20px 40px rgba(2, 6, 23, 0.08);
        display: none;
      }

      .nav.open {
        display: flex;
      }

      .nav-link {
        padding: 13px 16px;
        border-radius: 10px;
      }

      .hero-content h1 {
        font-size: 34px;
      }

      .section-head h2 {
        font-size: 28px;
      }

      .cards-grid {
        grid-template-columns: 1fr;
      }

      .steps-grid {
        grid-template-columns: 1fr;
      }

      .metrics {
        margin-top: -20px;
        border-radius: 16px;
      }

      .metrics-grid {
        grid-template-columns: 1fr 1fr;
        padding: 0 16px;
        gap: 14px;
      }

      .metric-num {
        font-size: 32px;
      }

      .section {
        padding: 60px 0;
      }
    }

    @media (max-width: 520px) {
      .container {
        padding: 0 18px;
      }

      .header-inner {
        height: 64px;
      }

      .nav {
        top: 64px;
      }

      .logo-text {
        font-size: 16px;
      }

      .logo-mark {
        width: 34px;
        height: 34px;
        font-size: 16px;
      }

      .hero-content h1 {
        font-size: 28px;
      }

      .hero-content p {
        font-size: 15px;
      }

      .hero-content {
        padding-top: 20px;
      }

      .page-hero {
        padding: 80px 0 100px;
      }

      .metrics-grid {
        grid-template-columns: 1fr;
      }

      .metric-card {
        padding: 22px;
      }

      .metric-num {
        font-size: 30px;
      }

      .section-head h2 {
        font-size: 24px;
      }

      .section-tag {
        font-size: 12px;
      }

      .btn {
        width: 100%;
        justify-content: center;
      }

      .hero-actions,
      .cta-actions {
        flex-direction: column;
      }

      .card-body {
        padding: 22px;
      }

      .faq-item {
        padding: 0 16px;
      }

      .footer-inner {
        grid-template-columns: 1fr;
        gap: 32px;
        padding: 0 20px;
      }

      .footer-links {
        flex-direction: column;
        gap: 24px;
      }
    }

/* roulang page: article */
:root {
  --primary: #2563eb;
  --primary-dark: #1e40af;
  --primary-light: #dbeafe;
  --accent: #f59e0b;
  --accent-light: #fef3c7;
  --dark-bg: #0b1220;
  --bg: #f6f8fb;
  --surface: #ffffff;
  --text: #0f172a;
  --text-muted: #64748b;
  --text-light: #94a3b8;
  --border: #e2e8f0;
  --radius: 16px;
  --radius-sm: 10px;
  --radius-lg: 24px;
  --shadow-sm: 0 2px 10px rgba(15,23,42,0.06);
  --shadow: 0 8px 28px rgba(15,23,42,0.08);
  --shadow-lg: 0 16px 48px rgba(15,23,42,0.12);
  --sidebar-w: 264px;
  --transition: .25s ease;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;background:var(--bg);color:var(--text);line-height:1.6;-webkit-font-smoothing:antialiased}
img{max-width:100%;display:block}
a{text-decoration:none;color:inherit}
button{font-family:inherit;cursor:pointer}
input{font-family:inherit}
ul,ol{list-style-position:inside}

.layout{min-height:100vh;display:flex}
.sidebar{width:var(--sidebar-w);background:var(--dark-bg);position:fixed;top:0;left:0;bottom:0;z-index:1200;overflow-y:auto;transition:transform .3s ease;scrollbar-width:thin}
.sidebar::-webkit-scrollbar{width:6px}
.sidebar::-webkit-scrollbar-thumb{background:rgba(255,255,255,.15);border-radius:6px}
.sidebar-inner{height:100%;display:flex;flex-direction:column;padding:32px 20px}
.sidebar-brand{display:flex;align-items:center;justify-content:space-between;margin-bottom:40px;padding-left:8px}
.sidebar-brand .logo{color:#fff;border-bottom:none;padding:0}
.sidebar-close{display:none;background:rgba(255,255,255,.08);border:none;color:#fff;width:36px;height:36px;border-radius:10px;font-size:22px;align-items:center;justify-content:center;transition:background var(--transition)}
.sidebar-close:hover{background:rgba(255,255,255,.16)}
.sidebar-label{font-size:12px;letter-spacing:1px;text-transform:uppercase;color:var(--text-light);margin-bottom:14px;padding-left:12px}
.sidebar-nav-wrap{margin-bottom:32px}
.nav{display:flex;flex-direction:column;gap:4px}
.nav-link{display:flex;align-items:center;gap:12px;padding:11px 14px;border-radius:12px;color:var(--text-light);font-size:15px;font-weight:500;position:relative;transition:background var(--transition),color var(--transition)}
.nav-link:hover{background:rgba(255,255,255,.07);color:#fff}
.nav-link.active{background:rgba(37,99,235,.16);color:#fff;font-weight:600}
.nav-link.active::before{content:'';position:absolute;left:0;top:50%;transform:translateY(-50%);width:3px;height:20px;background:var(--accent);border-radius:0 4px 4px 0}
.nav-link i{width:18px;text-align:center;font-style:normal;opacity:.75}
.sidebar-note{margin-top:auto;background:rgba(255,255,255,.05);border:1px solid rgba(255,255,255,.08);border-radius:16px;padding:18px 16px;color:#cbd5e1}
.sidebar-note p{font-size:13px;line-height:1.6;color:var(--text-light)}
.sidebar-note-icon{display:inline-flex;align-items:center;justify-content:center;width:32px;height:32px;border-radius:10px;background:linear-gradient(135deg,var(--primary),var(--accent));color:#fff;font-size:14px;font-weight:700;margin-bottom:10px}

.main-area{flex:1;min-width:0;margin-left:var(--sidebar-w);display:flex;flex-direction:column;min-height:100vh}
.topbar{display:none;align-items:center;justify-content:space-between;padding:14px 20px;background:var(--surface);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:1100}
.topbar .logo{border-bottom:none;padding:0}
.menu-toggle{display:flex;align-items:center;justify-content:center;width:40px;height:40px;border:1px solid var(--border);background:var(--bg);border-radius:12px;font-size:20px;color:var(--text);transition:background var(--transition)}
.menu-toggle:hover{background:var(--primary-light)}
.topbar-status{display:inline-flex;align-items:center;gap:6px;font-size:13px;color:#10b981;background:#ecfdf5;padding:6px 14px;border-radius:999px;font-weight:600}
.topbar-status::before{content:'';width:6px;height:6px;border-radius:50%;background:#10b981}

.main-content{flex:1;width:100%}
.page-container{max-width:1080px;margin:0 auto;padding:40px 32px}
.sidebar-overlay{display:none;position:fixed;inset:0;background:rgba(15,23,42,.6);z-index:1150;backdrop-filter:blur(2px)}

/* logo */
.logo{display:inline-flex;align-items:center;gap:10px;font-weight:800;border-bottom:2px solid transparent;padding-bottom:4px;transition:border-color var(--transition)}
.logo-mark{width:38px;height:38px;border-radius:11px;background:linear-gradient(135deg,var(--primary),var(--accent));color:#fff;display:flex;align-items:center;justify-content:center;font-weight:800;font-size:20px;box-shadow:0 4px 14px rgba(37,99,235,.35)}
.logo-text{font-size:20px;letter-spacing:.4px;line-height:1.2}

/* article hero */
.article-hero{padding:20px 0 28px;border-bottom:1px solid var(--border);margin-bottom:32px}
.breadcrumb{font-size:13px;color:var(--text-muted);margin-bottom:18px;display:flex;gap:8px;flex-wrap:wrap;align-items:center}
.breadcrumb a{color:var(--text-muted);transition:color var(--transition)}
.breadcrumb a:hover{color:var(--primary)}
.breadcrumb .sep{color:#cbd5e1}
.breadcrumb .current{color:var(--primary);font-weight:500}
.article-category{display:inline-flex;padding:5px 14px;background:var(--primary-light);color:var(--primary);border-radius:999px;font-size:13px;font-weight:600;margin-bottom:16px}
.article-title{font-size:36px;font-weight:800;line-height:1.28;margin-bottom:16px;letter-spacing:-.5px;color:var(--text)}
.article-desc{font-size:17px;color:var(--text-muted);line-height:1.75;margin-bottom:20px;max-width:860px}
.article-meta{display:flex;gap:24px;flex-wrap:wrap;font-size:14px;color:var(--text-muted)}
.article-meta span{display:inline-flex;align-items:center;gap:6px}
.article-meta .meta-dot{width:4px;height:4px;border-radius:50%;background:#cbd5e1}

/* cover */
.article-cover{border-radius:var(--radius);overflow:hidden;margin-bottom:36px;box-shadow:var(--shadow);position:relative}
.article-cover img{width:100%;height:auto;max-height:460px;object-fit:cover}
.article-cover::after{content:'';position:absolute;inset:0;background:linear-gradient(180deg,transparent 60%,rgba(11,18,32,.18));pointer-events:none}

/* content */
.article-content{font-size:16px;line-height:1.9;color:#1e293b;margin-bottom:40px;max-width:880px}
.article-content p{margin-bottom:22px}
.article-content h2{font-size:24px;font-weight:700;margin:36px 0 18px;padding:8px 0 8px 16px;border-left:4px solid var(--primary);background:linear-gradient(90deg,rgba(37,99,235,.08),transparent);border-radius:0 10px 10px 0}
.article-content h3{font-size:20px;font-weight:700;margin:28px 0 14px}
.article-content ul,.article-content ol{margin:0 0 22px;padding-left:26px}
.article-content li{margin-bottom:8px}
.article-content blockquote{border-left:3px solid var(--accent);background:var(--accent-light);padding:16px 20px;border-radius:0 12px 12px 0;margin:24px 0;color:#92400e;font-size:15px}
.article-content blockquote p:last-child{margin-bottom:0}
.article-content img{border-radius:var(--radius-sm);margin:24px 0;box-shadow:var(--shadow-sm)}
.article-content a{color:var(--primary);border-bottom:1px solid rgba(37,99,235,.3)}
.article-content a:hover{border-bottom-color:var(--primary)}
.article-content code{background:#f1f5f9;padding:2px 8px;border-radius:6px;font-size:14px;color:#0f172a}
.article-content pre{background:#0b1220;color:#e2e8f0;padding:20px;border-radius:14px;overflow-x:auto;margin:24px 0;font-size:14px;line-height:1.7}
.article-content pre code{background:transparent;color:inherit;padding:0}

/* article footer bar */
.article-footer-bar{display:flex;justify-content:space-between;align-items:center;padding:24px 0;border-top:1px solid var(--border);border-bottom:1px solid var(--border);margin-bottom:48px;flex-wrap:wrap;gap:16px}
.article-tags{display:flex;gap:8px;flex-wrap:wrap}
.tag{display:inline-block;padding:6px 14px;background:#f1f5f9;border-radius:999px;font-size:13px;color:#475569;transition:all var(--transition);font-weight:500}
.tag:hover{background:var(--primary);color:#fff}
.article-share{display:flex;gap:8px}
.share-btn{width:36px;height:36px;border-radius:50%;display:flex;align-items:center;justify-content:center;background:#f1f5f9;color:#475569;border:none;transition:all var(--transition);font-size:14px;font-weight:600}
.share-btn:hover{background:var(--primary);color:#fff;transform:translateY(-2px);box-shadow:var(--shadow-sm)}

/* section headers */
.section-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:28px}
.section-title{font-size:24px;font-weight:800;position:relative;padding-left:16px;letter-spacing:-.3px}
.section-title::before{content:'';position:absolute;left:0;top:3px;bottom:3px;width:4px;border-radius:4px;background:var(--primary)}
.section-more{font-size:14px;color:var(--text-muted);display:inline-flex;align-items:center;gap:4px;transition:color var(--transition)}
.section-more:hover{color:var(--primary)}

/* related */
.related-section{margin-bottom:56px}
.related-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.related-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;transition:all .3s ease;display:flex;flex-direction:column}
.related-card:hover{transform:translateY(-5px);box-shadow:var(--shadow-lg);border-color:transparent}
.card-img{aspect-ratio:16/9;overflow:hidden;background:var(--bg)}
.card-img img{width:100%;height:100%;object-fit:cover;transition:transform .45s ease}
.related-card:hover .card-img img{transform:scale(1.05)}
.card-body{padding:20px;display:flex;flex-direction:column;flex:1}
.card-tag{font-size:12px;color:var(--primary);font-weight:600;margin-bottom:8px;display:block;text-transform:uppercase;letter-spacing:.5px}
.card-title{font-size:16px;font-weight:700;line-height:1.5;margin-bottom:10px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;transition:color var(--transition)}
a.related-card:hover .card-title{color:var(--primary)}
.card-excerpt{font-size:14px;color:var(--text-muted);line-height:1.65;margin-bottom:14px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.card-date{font-size:13px;color:var(--text-muted);margin-top:auto;display:flex;align-items:center;gap:6px}

/* faq */
.faq-section{margin-bottom:56px}
.faq-list{display:flex;flex-direction:column;gap:16px}
.faq-item{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:24px 28px;transition:box-shadow var(--transition),border-color var(--transition)}
.faq-item:hover{border-color:var(--primary);box-shadow:var(--shadow-sm)}
.faq-q{font-size:17px;font-weight:700;margin-bottom:10px;display:flex;align-items:center;gap:10px}
.faq-q .q-icon{width:28px;height:28px;border-radius:8px;background:var(--primary-light);color:var(--primary);display:flex;align-items:center;justify-content:center;font-size:14px;font-weight:800;flex-shrink:0}
.faq-a{font-size:15px;color:var(--text-muted);line-height:1.75;padding-left:38px}

/* cta */
.cta-section{border-radius:var(--radius-lg);background:var(--dark-bg);padding:52px 48px;display:flex;align-items:center;justify-content:space-between;gap:32px;flex-wrap:wrap;margin-bottom:16px;position:relative;overflow:hidden;border:1px solid rgba(255,255,255,.06)}
.cta-section::before{content:'';position:absolute;inset:0;background-image:url('/assets/images/backpic/back-1.png');background-size:cover;background-position:center;opacity:.22}
.cta-section::after{content:'';position:absolute;top:-60px;right:-60px;width:200px;height:200px;background:radial-gradient(circle,rgba(37,99,235,.35),transparent 70%);pointer-events:none}
.cta-content{position:relative;z-index:1;color:#fff;flex:1;min-width:280px}
.cta-content h2{font-size:30px;font-weight:800;margin-bottom:14px;letter-spacing:-.5px}
.cta-content p{color:rgba(255,255,255,.75);line-height:1.7;margin-bottom:0;font-size:15px}
.cta-actions{position:relative;z-index:1;display:flex;gap:12px;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;justify-content:center;padding:12px 28px;border-radius:12px;font-size:15px;font-weight:600;border:none;transition:all var(--transition);gap:8px}
.btn:focus-visible{outline:3px solid var(--primary-light);outline-offset:2px}
.btn-primary{background:var(--primary);color:#fff;box-shadow:0 4px 16px rgba(37,99,235,.3)}
.btn-primary:hover{background:var(--primary-dark);transform:translateY(-2px);box-shadow:0 8px 24px rgba(37,99,235,.4)}
.btn-light{background:#fff;color:var(--dark-bg)}
.btn-light:hover{background:#e2e8f0;transform:translateY(-2px)}
.btn-outline{background:transparent;color:rgba(255,255,255,.85);border:1px solid rgba(255,255,255,.35)}
.btn-outline:hover{background:rgba(255,255,255,.12);border-color:rgba(255,255,255,.6)}

/* not found */
.not-found-card{max-width:680px;margin:60px auto;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);padding:64px 48px;text-align:center;box-shadow:var(--shadow)}
.not-found-code{font-size:72px;font-weight:800;background:linear-gradient(135deg,var(--primary),var(--accent));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;line-height:1;margin-bottom:20px}
.not-found-card h1{font-size:28px;font-weight:800;margin-bottom:14px}
.not-found-card p{font-size:16px;color:var(--text-muted);margin-bottom:28px}
.not-found-card .btn{margin-top:4px}

/* footer */
.footer{background:#f1f5f9;border-top:1px solid var(--border);padding:48px 0 0;width:100%}
.footer-inner{max-width:1080px;margin:0 auto;padding:0 32px;display:flex;gap:48px;flex-wrap:wrap;justify-content:space-between}
.footer-brand{flex:1 1 300px}
.footer-brand p{color:var(--text-muted);font-size:14px;line-height:1.7;margin-top:14px;max-width:360px}
.footer-links{display:flex;gap:56px;flex-wrap:wrap}
.footer-col{display:flex;flex-direction:column;gap:10px}
.footer-col h4{font-size:16px;margin-bottom:6px;color:var(--text);font-weight:700}
.footer-col a{color:var(--text-muted);font-size:14px;transition:color var(--transition),padding-left var(--transition)}
.footer-col a:hover{color:var(--primary);padding-left:4px}
.footer-bottom{text-align:center;padding:20px 16px;border-top:1px solid var(--border);margin-top:40px;color:var(--text-muted);font-size:13px}

/* responsive */
@media (max-width: 1024px) {
  .related-grid{grid-template-columns:repeat(2,1fr)}
  .page-container{padding:32px 24px}
}
@media (max-width: 991px) {
  .sidebar{transform:translateX(-100%)}
  .sidebar.show{transform:translateX(0)}
  .sidebar-close{display:flex}
  .main-area{margin-left:0}
  .topbar{display:flex}
  .sidebar-overlay.show{display:block}
  .footer-inner{flex-direction:column}
}
@media (max-width: 768px) {
  .page-container{padding:24px 16px}
  .article-title{font-size:28px}
  .article-desc{font-size:15px}
  .article-meta{flex-direction:column;gap:8px}
  .article-content{font-size:15px}
  .cta-section{padding:36px 24px;flex-direction:column}
  .cta-content h2{font-size:24px}
  .footer-bottom{font-size:12px}
}
@media (max-width: 520px) {
  .related-grid{grid-template-columns:1fr}
  .article-title{font-size:24px}
  .article-footer-bar{flex-direction:column;align-items:flex-start}
  .faq-item{padding:18px 16px}
  .faq-a{padding-left:0}
  .not-found-card{padding:40px 24px}
  .footer-links{gap:24px}
}

/* roulang page: category3 */
/* ===== Design Tokens ===== */
    :root {
      --primary: #4f46e5;
      --primary-dark: #4338ca;
      --primary-light: #818cf8;
      --accent: #06b6d4;
      --accent-dark: #0891b2;
      --bg: #f1f5f9;
      --surface: #ffffff;
      --surface-alt: #f8fafc;
      --text: #0f172a;
      --text-weak: #64748b;
      --text-invert: #f8fafc;
      --border: #e2e8f0;
      --radius: 16px;
      --radius-sm: 10px;
      --radius-lg: 24px;
      --shadow-sm: 0 1px 3px rgba(15, 23, 42, .06);
      --shadow-md: 0 4px 16px rgba(15, 23, 42, .08);
      --shadow-lg: 0 12px 32px rgba(15, 23, 42, .12);
      --sidebar-w: 260px;
      --topbar-h: 64px;
      --font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Segoe UI", Roboto, sans-serif;
    }

    /* ===== Reset / Base ===== */
    *, *::before, *::after {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    html {
      scroll-behavior: smooth;
      -webkit-text-size-adjust: 100%;
    }
    body {
      font-family: var(--font-family);
      background: var(--bg);
      color: var(--text);
      line-height: 1.65;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    a {
      color: inherit;
      text-decoration: none;
    }
    img {
      max-width: 100%;
      display: block;
    }
    button, input {
      font-family: inherit;
      font-size: inherit;
      border: none;
      background: none;
    }
    ul, ol {
      list-style: none;
    }
    :focus-visible {
      outline: 3px solid var(--primary-light);
      outline-offset: 2px;
      border-radius: 4px;
    }

    /* ===== App Shell Layout ===== */
    .app-shell {
      min-height: 100vh;
    }
    .sidebar {
      position: fixed;
      top: 0;
      left: 0;
      bottom: 0;
      width: var(--sidebar-w);
      background: #0f172a;
      color: #cbd5e1;
      display: flex;
      flex-direction: column;
      z-index: 1000;
      transition: transform .3s ease;
    }
    .sidebar-inner {
      display: flex;
      flex-direction: column;
      height: 100%;
      padding: 28px 20px;
      overflow-y: auto;
    }
    .sidebar .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      padding-bottom: 24px;
      border-bottom: 1px solid rgba(255,255,255,.08);
      margin-bottom: 24px;
    }
    .logo-mark {
      width: 36px;
      height: 36px;
      background: linear-gradient(135deg, var(--primary), var(--accent));
      border-radius: 10px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      font-size: 18px;
      color: #fff;
      flex-shrink: 0;
      letter-spacing: 0;
      box-shadow: 0 4px 12px rgba(79,70,229,.35);
    }
    .logo-text {
      font-size: 17px;
      font-weight: 700;
      color: #fff;
      letter-spacing: .5px;
      line-height: 1.3;
    }

    .sidebar-nav {
      flex: 1;
      display: flex;
      flex-direction: column;
      gap: 4px;
    }
    .sidebar-section-label {
      font-size: 11px;
      text-transform: uppercase;
      letter-spacing: 1.5px;
      color: #64748b;
      padding: 16px 12px 8px;
      font-weight: 600;
    }
    .nav-link {
      display: flex;
      align-items: center;
      gap: 12px;
      padding: 11px 14px;
      border-radius: var(--radius-sm);
      color: #94a3b8;
      font-size: 15px;
      font-weight: 500;
      transition: all .22s ease;
      position: relative;
    }
    .nav-link i {
      width: 20px;
      text-align: center;
      font-size: 15px;
    }
    .nav-link:hover {
      background: rgba(255,255,255,.06);
      color: #e2e8f0;
      transform: translateX(2px);
    }
    .nav-link.active {
      background: linear-gradient(135deg, rgba(79,70,229,.9), rgba(6,182,212,.8));
      color: #fff;
      font-weight: 600;
      box-shadow: 0 4px 16px rgba(79,70,229,.35);
    }
    .nav-link.active::after {
      content: "";
      position: absolute;
      right: 12px;
      top: 50%;
      transform: translateY(-50%);
      width: 6px;
      height: 6px;
      border-radius: 50%;
      background: #fff;
      opacity: .8;
    }
    .sidebar-footer-note {
      margin-top: 24px;
      padding: 14px;
      background: rgba(255,255,255,.04);
      border-radius: var(--radius-sm);
      font-size: 12px;
      color: #64748b;
      line-height: 1.5;
      border: 1px solid rgba(255,255,255,.05);
    }
    .sidebar-footer-note strong {
      color: #94a3b8;
      display: block;
      margin-bottom: 4px;
    }

    /* ===== Main Area ===== */
    .main-area {
      margin-left: var(--sidebar-w);
      min-height: 100vh;
      display: flex;
      flex-direction: column;
    }
    .topbar {
      position: sticky;
      top: 0;
      height: var(--topbar-h);
      background: rgba(255,255,255,.82);
      backdrop-filter: blur(14px);
      -webkit-backdrop-filter: blur(14px);
      border-bottom: 1px solid var(--border);
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0 40px;
      z-index: 900;
    }
    .topbar-left {
      display: flex;
      align-items: center;
      gap: 14px;
    }
    .topbar-breadcrumb {
      font-size: 13px;
      color: var(--text-weak);
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .topbar-breadcrumb a:hover {
      color: var(--primary);
    }
    .topbar-breadcrumb i {
      font-size: 10px;
      color: #94a3b8;
    }
    .topbar-breadcrumb .current {
      color: var(--text);
      font-weight: 600;
    }
    .topbar-right {
      display: flex;
      align-items: center;
      gap: 14px;
    }
    .topbar-search {
      position: relative;
    }
    .topbar-search input {
      width: 220px;
      padding: 8px 14px 8px 36px;
      border-radius: 30px;
      background: var(--surface-alt);
      border: 1px solid var(--border);
      font-size: 13px;
      color: var(--text);
      transition: all .25s ease;
    }
    .topbar-search input:focus {
      outline: none;
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(79,70,229,.12);
      width: 260px;
      background: #fff;
    }
    .topbar-search i {
      position: absolute;
      left: 13px;
      top: 50%;
      transform: translateY(-50%);
      color: #94a3b8;
      font-size: 13px;
    }
    .hamburger {
      display: none;
      width: 40px;
      height: 40px;
      border-radius: 10px;
      background: var(--surface);
      border: 1px solid var(--border);
      font-size: 16px;
      color: var(--text);
      cursor: pointer;
      align-items: center;
      justify-content: center;
      transition: all .2s ease;
    }
    .hamburger:hover {
      background: var(--surface-alt);
      color: var(--primary);
    }
    .sidebar-overlay {
      display: none;
      position: fixed;
      inset: 0;
      background: rgba(15,23,42,.5);
      z-index: 999;
      opacity: 0;
      transition: opacity .3s ease;
    }
    .sidebar-overlay.active {
      opacity: 1;
    }

    /* ===== Container / Sections ===== */
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 40px;
    }
    .section {
      padding: 72px 0;
    }
    .section-alt {
      background: var(--surface-alt);
      border-top: 1px solid var(--border);
      border-bottom: 1px solid var(--border);
    }
    .section-head {
      margin-bottom: 44px;
    }
    .section-tag {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      background: rgba(79,70,229,.08);
      color: var(--primary);
      font-size: 13px;
      font-weight: 600;
      padding: 5px 14px;
      border-radius: 30px;
      margin-bottom: 12px;
      letter-spacing: .5px;
    }
    .section-tag i {
      font-size: 11px;
    }
    .section-title {
      font-size: 32px;
      font-weight: 800;
      line-height: 1.25;
      letter-spacing: -0.5px;
      color: var(--text);
      margin-bottom: 10px;
    }
    .section-desc {
      font-size: 16px;
      color: var(--text-weak);
      max-width: 620px;
      line-height: 1.7;
    }
    .section-head.center {
      text-align: center;
    }
    .section-head.center .section-desc {
      margin: 0 auto;
    }

    /* ===== Page Hero / Banner ===== */
    .page-hero {
      position: relative;
      padding: 80px 0 100px;
      background:
        linear-gradient(135deg, rgba(15,23,42,.88) 0%, rgba(15,23,42,.72) 50%, rgba(79,70,229,.55) 100%),
        url('/assets/images/backpic/back-1.png') center/cover no-repeat;
      color: #fff;
      overflow: hidden;
    }
    .page-hero::after {
      content: "";
      position: absolute;
      right: -120px;
      top: -120px;
      width: 300px;
      height: 300px;
      background: radial-gradient(circle, rgba(6,182,212,.35), transparent 70%);
      border-radius: 50%;
    }
    .page-hero .container {
      position: relative;
      z-index: 1;
    }
    .hero-breadcrumb {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 14px;
      color: #94a3b8;
      margin-bottom: 18px;
    }
    .hero-breadcrumb a {
      color: #cbd5e1;
    }
    .hero-breadcrumb a:hover {
      color: #fff;
    }
    .hero-breadcrumb i {
      font-size: 10px;
      color: #64748b;
    }
    .page-hero h1 {
      font-size: 42px;
      font-weight: 800;
      line-height: 1.2;
      letter-spacing: -.5px;
      margin-bottom: 16px;
      max-width: 640px;
    }
    .page-hero h1 span {
      background: linear-gradient(90deg, var(--primary-light), var(--accent));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    .hero-desc {
      font-size: 17px;
      color: #cbd5e1;
      max-width: 600px;
      line-height: 1.8;
      margin-bottom: 28px;
    }
    .hero-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      margin-bottom: 32px;
    }
    .hero-tags span {
      background: rgba(255,255,255,.1);
      border: 1px solid rgba(255,255,255,.15);
      padding: 6px 14px;
      border-radius: 30px;
      font-size: 13px;
      color: #e2e8f0;
      backdrop-filter: blur(8px);
    }
    .hero-actions {
      display: flex;
      gap: 14px;
      flex-wrap: wrap;
    }

    /* ===== Buttons ===== */
    .btn {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 12px 28px;
      border-radius: 30px;
      font-weight: 600;
      font-size: 15px;
      cursor: pointer;
      transition: all .25s ease;
      border: 1px solid transparent;
      line-height: 1.4;
    }
    .btn-primary {
      background: linear-gradient(135deg, var(--primary), var(--primary-dark));
      color: #fff;
      box-shadow: 0 4px 14px rgba(79,70,229,.3);
    }
    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 8px 24px rgba(79,70,229,.4);
      background: linear-gradient(135deg, var(--primary-dark), var(--primary));
    }
    .btn-accent {
      background: linear-gradient(135deg, var(--accent), var(--accent-dark));
      color: #fff;
      box-shadow: 0 4px 14px rgba(6,182,212,.3);
    }
    .btn-accent:hover {
      transform: translateY(-2px);
      box-shadow: 0 8px 24px rgba(6,182,212,.4);
    }
    .btn-outline {
      background: transparent;
      border-color: rgba(255,255,255,.35);
      color: #fff;
    }
    .btn-outline:hover {
      background: rgba(255,255,255,.1);
      border-color: rgba(255,255,255,.6);
      transform: translateY(-2px);
    }
    .btn-light {
      background: #fff;
      color: var(--text);
      box-shadow: 0 2px 8px rgba(0,0,0,.08);
    }
    .btn-light:hover {
      background: var(--surface-alt);
      transform: translateY(-2px);
      box-shadow: 0 6px 16px rgba(0,0,0,.1);
    }
    .btn i {
      font-size: 13px;
    }

    /* ===== Data Metrics ===== */
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .metric-card {
      background: var(--surface);
      border-radius: var(--radius);
      padding: 30px 24px;
      border: 1px solid var(--border);
      box-shadow: var(--shadow-sm);
      transition: all .3s ease;
      position: relative;
      overflow: hidden;
    }
    .metric-card::before {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 3px;
      background: linear-gradient(90deg, var(--primary), var(--accent));
      transform: scaleX(0);
      transform-origin: left;
      transition: transform .4s ease;
    }
    .metric-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }
    .metric-card:hover::before {
      transform: scaleX(1);
    }
    .metric-icon {
      width: 44px;
      height: 44px;
      border-radius: 12px;
      background: linear-gradient(135deg, rgba(79,70,229,.1), rgba(6,182,212,.1));
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 18px;
      color: var(--primary);
      margin-bottom: 16px;
    }
    .metric-number {
      font-size: 34px;
      font-weight: 800;
      color: var(--text);
      letter-spacing: -1px;
      line-height: 1.1;
      margin-bottom: 4px;
    }
    .metric-number em {
      font-style: normal;
      font-size: 18px;
      font-weight: 700;
      color: var(--primary);
      margin-left: 2px;
    }
    .metric-label {
      font-size: 14px;
      color: var(--text-weak);
    }

    /* ===== Feature Cards ===== */
    .feature-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .feature-card {
      background: var(--surface);
      border-radius: var(--radius);
      overflow: hidden;
      border: 1px solid var(--border);
      box-shadow: var(--shadow-sm);
      transition: all .3s ease;
      display: flex;
      flex-direction: column;
    }
    .feature-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-lg);
      border-color: transparent;
    }
    .feature-card-img {
      position: relative;
      height: 180px;
      overflow: hidden;
    }
    .feature-card-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform .5s ease;
    }
    .feature-card:hover .feature-card-img img {
      transform: scale(1.05);
    }
    .feature-card-img::after {
      content: "";
      position: absolute;
      inset: 0;
      background: linear-gradient(180deg, transparent 55%, rgba(15,23,42,.35));
    }
    .feature-card-cat {
      position: absolute;
      top: 14px;
      left: 14px;
      z-index: 1;
      background: rgba(255,255,255,.92);
      backdrop-filter: blur(8px);
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 12px;
      font-weight: 600;
      color: var(--primary);
      box-shadow: var(--shadow-sm);
    }
    .feature-card-body {
      padding: 24px;
      flex: 1;
      display: flex;
      flex-direction: column;
    }
    .feature-card-body h3 {
      font-size: 18px;
      font-weight: 700;
      margin-bottom: 8px;
      color: var(--text);
    }
    .feature-card-body p {
      font-size: 14px;
      color: var(--text-weak);
      line-height: 1.7;
      flex: 1;
      margin-bottom: 16px;
    }
    .feature-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 6px;
    }
    .feature-tags span {
      background: var(--surface-alt);
      border: 1px solid var(--border);
      border-radius: 20px;
      padding: 3px 10px;
      font-size: 12px;
      color: var(--text-weak);
    }

    /* ===== Process / Steps ===== */
    .process-section {
      background: linear-gradient(135deg, #0f172a, #1e1b4b);
      color: #fff;
      padding: 80px 0;
    }
    .process-section .section-title {
      color: #fff;
    }
    .process-section .section-desc {
      color: #94a3b8;
    }
    .process-steps {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      margin-top: 40px;
    }
    .step-item {
      background: rgba(255,255,255,.04);
      border: 1px solid rgba(255,255,255,.08);
      border-radius: var(--radius);
      padding: 32px 24px;
      text-align: center;
      position: relative;
      transition: all .3s ease;
    }
    .step-item:hover {
      background: rgba(255,255,255,.08);
      transform: translateY(-4px);
    }
    .step-number {
      width: 48px;
      height: 48px;
      background: linear-gradient(135deg, var(--primary), var(--accent));
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 18px;
      font-weight: 800;
      color: #fff;
      margin: 0 auto 16px;
      box-shadow: 0 4px 16px rgba(79,70,229,.4);
    }
    .step-item h4 {
      font-size: 17px;
      font-weight: 700;
      margin-bottom: 8px;
      color: #f1f5f9;
    }
    .step-item p {
      font-size: 13px;
      color: #94a3b8;
      line-height: 1.6;
    }
    .step-arrow {
      position: absolute;
      top: 50%;
      right: -18px;
      transform: translateY(-50%);
      color: var(--accent);
      font-size: 16px;
      z-index: 2;
      opacity: .7;
    }

    /* ===== Deep Banner / Highlights ===== */
    .deep-banner {
      position: relative;
      background:
        linear-gradient(90deg, rgba(15,23,42,.92) 0%, rgba(15,23,42,.75) 60%, rgba(79,70,229,.5) 100%),
        url('/assets/images/backpic/back-2.png') center/cover no-repeat;
      padding: 72px 0;
      color: #fff;
    }
    .deep-banner .container {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }
    .deep-copy h2 {
      font-size: 30px;
      font-weight: 800;
      line-height: 1.3;
      margin-bottom: 14px;
    }
    .deep-copy p {
      color: #cbd5e1;
      line-height: 1.8;
      margin-bottom: 20px;
    }
    .deep-points {
      display: flex;
      flex-direction: column;
      gap: 14px;
    }
    .deep-point {
      display: flex;
      align-items: flex-start;
      gap: 12px;
      background: rgba(255,255,255,.05);
      border: 1px solid rgba(255,255,255,.08);
      border-radius: var(--radius-sm);
      padding: 14px 16px;
      transition: all .25s ease;
    }
    .deep-point:hover {
      background: rgba(255,255,255,.1);
    }
    .deep-point i {
      color: var(--accent);
      font-size: 16px;
      margin-top: 3px;
    }
    .deep-point div strong {
      display: block;
      font-size: 15px;
      color: #f1f5f9;
      margin-bottom: 2px;
    }
    .deep-point div span {
      font-size: 13px;
      color: #94a3b8;
    }
    .deep-stats {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 20px;
    }
    .deep-stat-card {
      background: rgba(255,255,255,.06);
      backdrop-filter: blur(12px);
      border: 1px solid rgba(255,255,255,.09);
      border-radius: var(--radius);
      padding: 28px 24px;
      text-align: center;
      transition: all .3s ease;
    }
    .deep-stat-card:hover {
      background: rgba(255,255,255,.1);
      transform: translateY(-4px);
    }
    .deep-stat-number {
      font-size: 38px;
      font-weight: 800;
      background: linear-gradient(90deg, var(--primary-light), var(--accent));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      line-height: 1.2;
    }
    .deep-stat-label {
      font-size: 14px;
      color: #94a3b8;
      margin-top: 4px;
    }

    /* ===== Content List ===== */
    .content-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .content-card {
      background: var(--surface);
      border-radius: var(--radius);
      overflow: hidden;
      border: 1px solid var(--border);
      box-shadow: var(--shadow-sm);
      transition: all .3s ease;
      display: flex;
      flex-direction: column;
    }
    .content-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-md);
    }
    .content-card-img {
      height: 160px;
      overflow: hidden;
      position: relative;
    }
    .content-card-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform .5s ease;
    }
    .content-card:hover .content-card-img img {
      transform: scale(1.04);
    }
    .content-card-body {
      padding: 20px 22px;
      flex: 1;
      display: flex;
      flex-direction: column;
    }
    .content-card-meta {
      display: flex;
      justify-content: space-between;
      align-items: center;
      margin-bottom: 8px;
    }
    .content-card-cat {
      font-size: 12px;
      font-weight: 600;
      color: var(--primary);
      background: rgba(79,70,229,.07);
      padding: 3px 10px;
      border-radius: 20px;
    }
    .content-card-date {
      font-size: 12px;
      color: #94a3b8;
    }
    .content-card h3 {
      font-size: 16px;
      font-weight: 700;
      line-height: 1.5;
      margin-bottom: 8px;
      color: var(--text);
    }
    .content-card p {
      font-size: 13px;
      color: var(--text-weak);
      line-height: 1.7;
      flex: 1;
    }

    /* ===== FAQ ===== */
    .faq-list {
      max-width: 820px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }
    .faq-item {
      background: var(--surface);
      border-radius: var(--radius);
      border: 1px solid var(--border);
      padding: 22px 28px;
      transition: all .25s ease;
      cursor: pointer;
    }
    .faq-item:hover {
      border-color: var(--primary-light);
      box-shadow: var(--shadow-sm);
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      gap: 16px;
      font-size: 16px;
      font-weight: 600;
      color: var(--text);
    }
    .faq-question i {
      color: var(--primary);
      font-size: 14px;
      transition: transform .3s ease;
      flex-shrink: 0;
    }
    .faq-item.open .faq-question i {
      transform: rotate(45deg);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height .35s ease, opacity .25s ease;
      opacity: 0;
      font-size: 14px;
      color: var(--text-weak);
      line-height: 1.8;
      border-top: 1px solid transparent;
      margin-top: 0;
    }
    .faq-item.open .faq-answer {
      max-height: 400px;
      opacity: 1;
      padding-top: 14px;
      border-top-color: var(--border);
      margin-top: 14px;
    }

    /* ===== CTA ===== */
    .cta-section {
      background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 50%, #312e81 100%);
      padding: 68px 0;
      color: #fff;
      text-align: center;
      position: relative;
      overflow: hidden;
    }
    .cta-section::before {
      content: "";
      position: absolute;
      top: -60px;
      left: 50%;
      transform: translateX(-50%);
      width: 400px;
      height: 200px;
      background: radial-gradient(ellipse, rgba(255,255,255,.12), transparent 70%);
      border-radius: 50%;
    }
    .cta-section h2 {
      font-size: 32px;
      font-weight: 800;
      margin-bottom: 12px;
      position: relative;
    }
    .cta-section p {
      font-size: 16px;
      color: #c7d2fe;
      max-width: 560px;
      margin: 0 auto 28px;
      line-height: 1.7;
      position: relative;
    }
    .cta-actions {
      display: flex;
      gap: 14px;
      justify-content: center;
      flex-wrap: wrap;
      position: relative;
    }

    /* ===== Footer ===== */
    .footer {
      background: #0f172a;
      color: #94a3b8;
      padding: 48px 40px 0;
      margin-top: auto;
    }
    .footer-inner {
      max-width: 1200px;
      margin: 0 auto;
      display: grid;
      grid-template-columns: 1.4fr 1fr;
      gap: 40px;
      padding-bottom: 32px;
      border-bottom: 1px solid rgba(255,255,255,.08);
    }
    .footer-brand .logo {
      display: inline-flex;
      align-items: center;
      gap: 10px;
      margin-bottom: 14px;
    }
    .footer-brand .logo-text {
      color: #fff;
      font-size: 18px;
    }
    .footer-brand p {
      font-size: 13px;
      line-height: 1.8;
      max-width: 360px;
      margin-top: 12px;
    }
    .footer-links {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
    }
    .footer-col h4 {
      font-size: 14px;
      font-weight: 700;
      color: #e2e8f0;
      margin-bottom: 12px;
    }
    .footer-col a {
      display: block;
      font-size: 13px;
      color: #94a3b8;
      padding: 5px 0;
      transition: all .2s ease;
    }
    .footer-col a:hover {
      color: #fff;
      padding-left: 4px;
    }
    .footer-bottom {
      max-width: 1200px;
      margin: 0 auto;
      text-align: center;
      padding: 20px 0;
      font-size: 13px;
      color: #64748b;
    }

    /* ===== Responsive ===== */
    @media (max-width: 1024px) {
      .container {
        padding: 0 28px;
      }
      .metrics-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .feature-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .process-steps {
        grid-template-columns: repeat(2, 1fr);
      }
      .step-arrow {
        display: none;
      }
      .deep-banner .container {
        grid-template-columns: 1fr;
      }
      .content-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .page-hero {
        padding: 60px 0 72px;
      }
      .page-hero h1 {
        font-size: 34px;
      }
    }

    @media (max-width: 768px) {
      .sidebar {
        transform: translateX(-100%);
      }
      .sidebar.open {
        transform: translateX(0);
      }
      .sidebar-overlay {
        display: block;
      }
      .sidebar-overlay.active {
        opacity: 1;
      }
      .main-area {
        margin-left: 0;
      }
      .topbar {
        padding: 0 20px;
      }
      .hamburger {
        display: inline-flex;
      }
      .topbar-search {
        display: none;
      }
      .container {
        padding: 0 20px;
      }
      .section {
        padding: 56px 0;
      }
      .section-title {
        font-size: 26px;
      }
      .page-hero h1 {
        font-size: 28px;
      }
      .hero-desc {
        font-size: 15px;
      }
      .feature-grid {
        grid-template-columns: 1fr;
      }
      .content-grid {
        grid-template-columns: 1fr;
      }
      .footer {
        padding: 40px 20px 0;
      }
      .footer-inner {
        grid-template-columns: 1fr;
        gap: 32px;
      }
      .footer-links {
        grid-template-columns: 1fr 1fr;
      }
      .deep-stats {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 520px) {
      .metrics-grid {
        grid-template-columns: 1fr;
      }
      .process-steps {
        grid-template-columns: 1fr;
      }
      .page-hero {
        padding: 44px 0 56px;
      }
      .page-hero h1 {
        font-size: 24px;
      }
      .hero-actions .btn {
        width: 100%;
        justify-content: center;
      }
      .topbar-breadcrumb {
        font-size: 12px;
      }
      .deep-stats {
        grid-template-columns: 1fr;
      }
      .deep-banner {
        padding: 48px 0;
      }
      .deep-copy h2 {
        font-size: 24px;
      }
      .cta-section h2 {
        font-size: 24px;
      }
      .footer-links {
        grid-template-columns: 1fr;
      }
      .section-title {
        font-size: 22px;
      }
    }

/* roulang page: category2 */
:root {
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --primary-light: #dbeafe;
  --accent: #f59e0b;
  --bg: #f8fafc;
  --bg-dark: #0f172a;
  --text: #1e293b;
  --text-weak: #64748b;
  --border: #e2e8f0;
  --radius: 16px;
  --radius-sm: 10px;
  --shadow: 0 4px 24px rgba(15, 23, 42, 0.06);
  --shadow-lg: 0 12px 40px rgba(15, 23, 42, 0.12);
  --transition: all 0.25s ease;
  --sidebar-width: 260px;
}

*,
*::before,
*::after {
  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(--bg);
  color: var(--text);
  line-height: 1.6;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: var(--primary);
  text-decoration: none;
  transition: var(--transition);
}

a:hover {
  color: var(--primary-dark);
}

button {
  font-family: inherit;
  cursor: pointer;
}

input {
  font-family: inherit;
}

:focus-visible {
  outline: 3px solid rgba(37, 99, 235, 0.4);
  outline-offset: 2px;
}

.app-shell {
  display: flex;
  min-height: 100vh;
}

.sidebar {
  width: var(--sidebar-width);
  background: var(--bg-dark);
  color: #f1f5f9;
  position: fixed;
  top: 0;
  bottom: 0;
  left: 0;
  display: flex;
  flex-direction: column;
  padding: 24px 16px;
  z-index: 100;
  transform: translateX(0);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  border-right: 1px solid rgba(255, 255, 255, 0.06);
}

.sidebar .logo {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  margin-bottom: 28px;
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.06);
  transition: var(--transition);
}

.sidebar .logo:hover {
  background: rgba(255, 255, 255, 0.1);
}

.logo-mark {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--primary), #7c3aed);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 18px;
  color: #fff;
  flex-shrink: 0;
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

.logo-text {
  font-weight: 700;
  font-size: 15px;
  color: #fff;
  line-height: 1.3;
  letter-spacing: 0.01em;
  white-space: nowrap;
}

.sidebar-nav {
  display: flex;
  flex-direction: column;
  gap: 2px;
  flex: 1;
}

.nav-label {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: #94a3b8;
  padding: 12px 12px 6px;
  font-weight: 600;
}

.sidebar .nav {
  display: flex;
  flex-direction: column;
  gap: 4px;
  width: 100%;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 14px;
  border-radius: 12px;
  color: #cbd5e1;
  font-weight: 500;
  font-size: 14px;
  transition: var(--transition);
  border: 1px solid transparent;
  width: 100%;
  position: relative;
}

.nav-link::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #475569;
  flex-shrink: 0;
  transition: var(--transition);
}

.nav-link:hover {
  background: rgba(255, 255, 255, 0.08);
  color: #fff;
  transform: translateX(2px);
}

.nav-link:hover::before {
  background: var(--primary);
}

.nav-link.active {
  background: linear-gradient(135deg, var(--primary), #7c3aed);
  color: #fff;
  box-shadow: 0 4px 16px rgba(37, 99, 235, 0.35);
}

.nav-link.active::before {
  background: #fff;
  box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.2);
}

.sidebar-foot {
  margin-top: auto;
  padding: 14px 16px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.06);
  font-size: 13px;
  color: #cbd5e1;
  display: flex;
  align-items: center;
  gap: 10px;
  border: 1px solid rgba(255, 255, 255, 0.05);
}

.sidebar-foot i {
  color: #34d399;
  font-size: 15px;
}

.mobile-topbar {
  display: none;
  position: sticky;
  top: 0;
  left: 0;
  right: 0;
  z-index: 99;
  background: var(--bg-dark);
  padding: 12px 16px;
  align-items: center;
  justify-content: space-between;
  box-shadow: 0 2px 12px rgba(15, 23, 42, 0.2);
}

.mobile-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  color: #fff;
  font-weight: 700;
  font-size: 14px;
}

.menu-toggle {
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: #fff;
  width: 40px;
  height: 40px;
  border-radius: 10px;
  font-size: 17px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}

.menu-toggle:hover {
  background: rgba(255, 255, 255, 0.2);
}

.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.5);
  z-index: 98;
  backdrop-filter: blur(2px);
}

.sidebar-overlay.show {
  display: block;
}

.main-content {
  flex: 1;
  margin-left: var(--sidebar-width);
  padding: 0 40px;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.main-content > * {
  max-width: 1200px;
  width: 100%;
  margin-left: auto;
  margin-right: auto;
}

.page-hero {
  position: relative;
  border-radius: 24px;
  padding: 52px 44px;
  margin: 32px 0 24px;
  background: linear-gradient(135deg, rgba(15, 23, 42, 0.9), rgba(37, 99, 235, 0.82)), url('/assets/images/backpic/back-2.png') center/cover no-repeat;
  color: #fff;
  overflow: hidden;
  box-shadow: 0 12px 40px rgba(15, 23, 42, 0.18);
}

.page-hero::after {
  content: '';
  position: absolute;
  right: -60px;
  top: -60px;
  width: 220px;
  height: 220px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.page-hero::before {
  content: '';
  position: absolute;
  left: -40px;
  bottom: -80px;
  width: 160px;
  height: 160px;
  border-radius: 50%;
  background: rgba(245, 158, 11, 0.12);
  border: 1px solid rgba(245, 158, 11, 0.15);
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(255, 255, 255, 0.15);
  padding: 6px 16px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 20px;
  position: relative;
  z-index: 2;
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.12);
}

.page-hero h1 {
  font-size: 32px;
  font-weight: 800;
  line-height: 1.3;
  margin-bottom: 14px;
  position: relative;
  z-index: 2;
}

.page-hero p {
  font-size: 16px;
  color: rgba(255, 255, 255, 0.85);
  max-width: 640px;
  position: relative;
  z-index: 2;
  line-height: 1.7;
}

.section {
  padding: 56px 0;
}

.section-header {
  margin-bottom: 32px;
}

.section-label {
  display: inline-block;
  background: var(--primary-light);
  color: var(--primary-dark);
  font-size: 13px;
  font-weight: 700;
  padding: 5px 14px;
  border-radius: 999px;
  margin-bottom: 12px;
  letter-spacing: 0.02em;
}

.section-header h2 {
  font-size: 28px;
  font-weight: 800;
  line-height: 1.35;
  color: var(--text);
  margin-bottom: 6px;
}

.section-header p {
  color: var(--text-weak);
  margin-top: 8px;
  max-width: 720px;
  font-size: 15px;
  line-height: 1.7;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-top: 8px;
}

.stat-card {
  background: #fff;
  border-radius: var(--radius);
  padding: 26px 24px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.stat-card::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), #7c3aed);
  opacity: 0;
  transition: var(--transition);
}

.stat-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary-light);
}

.stat-card:hover::after {
  opacity: 1;
}

.stat-number {
  font-size: 36px;
  font-weight: 800;
  color: var(--primary);
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.stat-label {
  font-size: 14px;
  color: var(--text-weak);
  margin-top: 6px;
  font-weight: 500;
}

.cards-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.card {
  background: #fff;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  overflow: hidden;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  position: relative;
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary-light);
}

.card-img {
  width: 100%;
  height: 180px;
  object-fit: cover;
  border-bottom: 1px solid var(--border);
}

.card-body {
  padding: 24px;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.tag {
  display: inline-block;
  background: var(--primary-light);
  color: var(--primary-dark);
  font-size: 12px;
  font-weight: 700;
  padding: 4px 12px;
  border-radius: 999px;
  margin-bottom: 14px;
  align-self: flex-start;
  letter-spacing: 0.02em;
}

.card-body h3 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 10px;
  line-height: 1.4;
  color: var(--text);
}

.card-body p {
  font-size: 14px;
  color: var(--text-weak);
  line-height: 1.7;
  margin-top: auto;
}

.steps-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.step-card {
  background: #fff;
  border-radius: var(--radius);
  padding: 30px 26px;
  border: 1px solid var(--border);
  position: relative;
  box-shadow: var(--shadow);
  transition: var(--transition);
}

.step-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary-light);
}

.step-number {
  font-size: 42px;
  font-weight: 800;
  background: linear-gradient(135deg, var(--primary), #7c3aed);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
  margin-bottom: 16px;
  display: block;
}

.step-card h3 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text);
}

.step-card p {
  font-size: 14px;
  color: var(--text-weak);
  line-height: 1.7;
}

.list-block {
  background: #fff;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  padding: 16px 28px;
}

.list-item {
  display: flex;
  gap: 18px;
  padding: 20px 0;
  border-bottom: 1px solid var(--border);
  align-items: flex-start;
  transition: var(--transition);
}

.list-item:last-child {
  border-bottom: none;
}

.list-item:hover {
  padding-left: 8px;
}

.list-icon {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  background: var(--primary-light);
  color: var(--primary-dark);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 17px;
  flex-shrink: 0;
}

.list-content h4 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 4px;
  color: var(--text);
}

.list-content p {
  font-size: 14px;
  color: var(--text-weak);
  line-height: 1.7;
}

.list-meta {
  font-size: 12px;
  color: var(--text-weak);
  margin-bottom: 4px;
  font-weight: 500;
}

.faq-section {
  background: linear-gradient(135deg, rgba(15, 23, 42, 0.96), rgba(30, 27, 75, 0.92)), url('/assets/images/backpic/back-3.png') center/cover no-repeat;
  padding: 60px 48px;
  border-radius: 24px;
  color: #fff;
  margin: 8px 0;
  position: relative;
  overflow: hidden;
}

.faq-section .section-header h2 {
  color: #fff;
}

.faq-section .section-header p {
  color: rgba(255, 255, 255, 0.7);
}

.faq-section .section-label {
  background: rgba(255, 255, 255, 0.12);
  color: #fff;
}

.faq-list {
  max-width: 900px;
  margin: 0 auto;
}

.faq-item {
  background: rgba(255, 255, 255, 0.06);
  border-radius: 14px;
  margin-bottom: 12px;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.08);
  transition: var(--transition);
}

.faq-item:hover {
  background: rgba(255, 255, 255, 0.09);
}

.faq-question {
  padding: 18px 22px;
  font-weight: 600;
  font-size: 15px;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: var(--transition);
  gap: 16px;
}

.faq-question i {
  font-size: 13px;
  transition: transform 0.3s ease;
  color: rgba(255, 255, 255, 0.6);
  flex-shrink: 0;
}

.faq-item.open .faq-question i {
  transform: rotate(180deg);
}

.faq-answer {
  padding: 0 22px 18px;
  color: #cbd5e1;
  font-size: 14px;
  line-height: 1.8;
  display: none;
}

.faq-item.open .faq-answer {
  display: block;
}

.cta-block {
  background: linear-gradient(135deg, var(--primary), #7c3aed);
  border-radius: 24px;
  padding: 52px 48px;
  text-align: center;
  color: #fff;
  margin: 16px 0;
  position: relative;
  overflow: hidden;
}

.cta-block::before {
  content: '';
  position: absolute;
  top: -40px;
  right: -40px;
  width: 160px;
  height: 160px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.08);
}

.cta-block::after {
  content: '';
  position: absolute;
  bottom: -60px;
  left: -30px;
  width: 140px;
  height: 140px;
  border-radius: 50%;
  background: rgba(0, 0, 0, 0.08);
}

.cta-block h2 {
  font-size: 28px;
  font-weight: 800;
  margin-bottom: 12px;
  position: relative;
  z-index: 2;
}

.cta-block p {
  color: rgba(255, 255, 255, 0.9);
  margin-bottom: 28px;
  max-width: 560px;
  margin-left: auto;
  margin-right: auto;
  position: relative;
  z-index: 2;
  font-size: 15px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: 12px;
  font-weight: 700;
  font-size: 15px;
  border: none;
  transition: var(--transition);
  position: relative;
  z-index: 2;
}

.btn-light {
  background: #fff;
  color: var(--primary-dark);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.12);
}

.btn-light:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(0, 0, 0, 0.18);
  color: var(--primary-dark);
}

.btn-light:active {
  transform: translateY(0);
}

.footer {
  margin-top: 64px;
  padding: 40px 0 24px;
  border-top: 1px solid var(--border);
}

.footer-inner {
  display: grid;
  grid-template-columns: 2fr 1.5fr;
  gap: 48px;
  padding-bottom: 32px;
}

.footer-brand .logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 0;
  border-bottom: none;
  margin-bottom: 14px;
}

.footer-brand .logo-mark {
  width: 34px;
  height: 34px;
  font-size: 15px;
  border-radius: 9px;
}

.footer-brand .logo-text {
  color: var(--text);
  font-size: 16px;
}

.footer-brand p {
  font-size: 14px;
  color: var(--text-weak);
  max-width: 360px;
  line-height: 1.7;
}

.footer-links {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}

.footer-col h4 {
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--text);
}

.footer-col a {
  display: block;
  font-size: 14px;
  color: var(--text-weak);
  margin-bottom: 10px;
  padding: 2px 0;
  transition: var(--transition);
}

.footer-col a:hover {
  color: var(--primary);
  padding-left: 4px;
}

.footer-bottom {
  border-top: 1px solid var(--border);
  padding-top: 20px;
  text-align: center;
  font-size: 13px;
  color: var(--text-weak);
}

@media (max-width: 1024px) {
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .cards-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .steps-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }
}

@media (max-width: 768px) {
  .sidebar {
    transform: translateX(-100%);
    box-shadow: none;
  }

  .sidebar.open {
    transform: translateX(0);
    box-shadow: 0 0 50px rgba(0, 0, 0, 0.4);
  }

  .mobile-topbar {
    display: flex;
  }

  .main-content {
    margin-left: 0;
    padding: 0 20px;
  }

  .page-hero {
    padding: 36px 28px;
    margin-top: 24px;
    border-radius: 20px;
  }

  .page-hero h1 {
    font-size: 26px;
  }

  .page-hero p {
    font-size: 15px;
  }

  .section {
    padding: 44px 0;
  }

  .section-header h2 {
    font-size: 23px;
  }

  .section-header p {
    font-size: 14px;
  }

  .faq-section {
    padding: 40px 24px;
    border-radius: 20px;
  }

  .cta-block {
    padding: 36px 24px;
    border-radius: 20px;
  }

  .cta-block h2 {
    font-size: 23px;
  }

  .footer {
    margin-top: 48px;
  }

  .footer-inner {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .footer-links {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 520px) {
  .main-content {
    padding: 0 16px;
  }

  .page-hero {
    padding: 32px 20px;
  }

  .page-hero h1 {
    font-size: 23px;
  }

  .hero-badge {
    font-size: 12px;
  }

  .stats-grid {
    grid-template-columns: 1fr;
    gap: 14px;
  }

  .cards-grid {
    grid-template-columns: 1fr;
    gap: 18px;
  }

  .steps-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .list-block {
    padding: 12px 20px;
  }

  .list-item {
    gap: 14px;
  }

  .list-icon {
    width: 36px;
    height: 36px;
    font-size: 15px;
  }

  .faq-section {
    padding: 32px 20px;
  }

  .faq-question {
    font-size: 14px;
    padding: 16px 18px;
  }

  .faq-answer {
    font-size: 13px;
  }

  .cta-block {
    padding: 32px 20px;
  }

  .cta-block h2 {
    font-size: 21px;
  }

  .btn {
    padding: 12px 24px;
    font-size: 14px;
  }

  .footer-inner {
    gap: 24px;
  }

  .footer-links {
    grid-template-columns: 1fr;
    gap: 20px;
  }
}