/* roulang page: index */
:root {
    --brand-600: #2b568a;
    --accent-500: #f97316;
    --slate-50: #f8fafc;
    --slate-100: #f1f5f9;
    --slate-600: #475569;
    --slate-800: #1e293b;
    --radius-lg: 1rem;
    --radius-2xl: 1.5rem;
    --shadow-card: 0 10px 30px -10px rgba(15, 40, 70, 0.1);
    --shadow-hover: 0 20px 45px -15px rgba(15, 40, 70, 0.18);
  }

  html {
    scroll-behavior: smooth;
  }

  body {
    font-family: 'Inter', 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
  }

  .hero-overlay {
    background: linear-gradient(105deg, rgba(8, 17, 30, .94) 0%, rgba(12, 28, 48, .85) 45%, rgba(20, 42, 70, .72) 100%);
  }

  .cta-overlay {
    background: linear-gradient(130deg, rgba(10, 22, 38, .93) 0%, rgba(30, 58, 95, .88) 60%, rgba(15, 35, 60, .86) 100%);
  }

  .card-hover {
    transition: transform .3s ease, box-shadow .3s ease, border-color .3s ease;
  }

  .card-hover:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-hover);
    border-color: rgba(43, 86, 138, .25);
  }

  .btn-primary {
    display: inline-flex;
    align-items: center;
    gap: .5rem;
    border-radius: 9999px;
    background: var(--brand-600);
    color: #fff;
    padding: .7rem 1.4rem;
    font-weight: 600;
    font-size: .925rem;
    transition: background .25s ease, transform .2s ease, box-shadow .25s ease;
    box-shadow: 0 8px 20px -8px rgba(43, 86, 138, .55);
  }

  .btn-primary:hover {
    background: #1e4b78;
    transform: translateY(-2px);
    box-shadow: 0 12px 28px -8px rgba(43, 86, 138, .6);
  }

  .btn-accent {
    display: inline-flex;
    align-items: center;
    gap: .5rem;
    border-radius: 9999px;
    background: var(--accent-500);
    color: #fff;
    padding: .7rem 1.4rem;
    font-weight: 600;
    font-size: .925rem;
    transition: background .25s ease, transform .2s ease, box-shadow .25s ease;
    box-shadow: 0 8px 20px -8px rgba(249, 115, 22, .5);
  }

  .btn-accent:hover {
    background: #ea580c;
    transform: translateY(-2px);
    box-shadow: 0 12px 28px -8px rgba(249, 115, 22, .55);
  }

  .btn-outline {
    display: inline-flex;
    align-items: center;
    gap: .5rem;
    border-radius: 9999px;
    background: rgba(255, 255, 255, .08);
    color: #fff;
    border: 1px solid rgba(255, 255, 255, .3);
    padding: .7rem 1.4rem;
    font-weight: 600;
    font-size: .925rem;
    backdrop-filter: blur(6px);
    transition: background .25s ease, border-color .25s ease, transform .2s ease;
  }

  .btn-outline:hover {
    background: rgba(255, 255, 255, .18);
    border-color: rgba(255, 255, 255, .55);
    transform: translateY(-2px);
  }

  .nav-link {
    position: relative;
    font-size: .92rem;
    font-weight: 500;
    color: rgba(255, 255, 255, .85);
    transition: color .2s ease;
    padding: .3rem 0;
  }

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

  .nav-link.active::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: -4px;
    width: 100%;
    height: 2px;
    border-radius: 2px;
    background: var(--accent-500);
  }

  .nav-link-light {
    position: relative;
    font-size: .92rem;
    font-weight: 500;
    color: var(--slate-800);
    transition: color .2s ease;
    padding: .3rem 0;
  }

  .nav-link-light:hover {
    color: var(--brand-600);
  }

  .nav-link-light.active {
    color: var(--brand-600);
  }

  .nav-link-light.active::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: -4px;
    width: 100%;
    height: 2px;
    border-radius: 2px;
    background: var(--accent-500);
  }

  .line-clamp-2 {
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
  }

  .section-badge {
    display: inline-flex;
    align-items: center;
    gap: .4rem;
    border-radius: 9999px;
    background: rgba(43, 86, 138, .08);
    color: var(--brand-600);
    font-size: .8rem;
    font-weight: 600;
    padding: .3rem .9rem;
    letter-spacing: .04em;
  }

  .step-card {
    display: flex;
    gap: 1.2rem;
    padding: 1.2rem 1.4rem;
    border-radius: 1rem;
    background: rgba(255, 255, 255, .06);
    border: 1px solid rgba(255, 255, 255, .12);
    backdrop-filter: blur(8px);
    transition: background .25s ease, border-color .25s ease, transform .2s ease;
  }

  .step-card:hover {
    background: rgba(255, 255, 255, .12);
    border-color: rgba(255, 255, 255, .25);
    transform: translateX(6px);
  }

  .step-num {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 2.4rem;
    height: 2.4rem;
    border-radius: 9999px;
    background: linear-gradient(135deg, #f97316, #fb923c);
    color: #fff;
    font-weight: 700;
    font-size: 1rem;
    flex-shrink: 0;
  }

  .stat-card {
    text-align: center;
    padding: 1.8rem 1rem;
    border-radius: 1.25rem;
    background: rgba(255, 255, 255, .08);
    border: 1px solid rgba(255, 255, 255, .12);
    transition: background .25s ease, transform .2s ease;
  }

  .stat-card:hover {
    background: rgba(255, 255, 255, .14);
    transform: translateY(-4px);
  }

  .faq-item summary {
    list-style: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    font-weight: 600;
    font-size: 1rem;
    color: var(--slate-800);
    padding: 1.1rem 1.3rem;
    background: var(--slate-50);
    border-radius: .9rem;
    transition: background .2s ease;
  }

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

  .faq-item summary::after {
    content: '+';
    font-size: 1.5rem;
    font-weight: 400;
    color: var(--brand-600);
    transition: transform .25s ease;
    line-height: 1;
  }

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

  .faq-item[open] summary {
    background: #fff;
    border-bottom-left-radius: 0;
    border-bottom-right-radius: 0;
    border: 1px solid var(--slate-100);
    border-bottom: none;
  }

  .faq-item .faq-content {
    padding: 1rem 1.4rem 1.3rem;
    color: var(--slate-600);
    font-size: .93rem;
    line-height: 1.75;
    background: #fff;
    border: 1px solid var(--slate-100);
    border-top: none;
    border-bottom-left-radius: .9rem;
    border-bottom-right-radius: .9rem;
  }

  .footer-link {
    color: rgba(255, 255, 255, .65);
    font-size: .92rem;
    transition: color .2s ease;
  }

  .footer-link:hover {
    color: #fff;
  }

  .hero-panel {
    background: rgba(255, 255, 255, .1);
    border: 1px solid rgba(255, 255, 255, .18);
    border-radius: 1.5rem;
    padding: 2rem;
    backdrop-filter: blur(14px);
    box-shadow: 0 30px 60px -20px rgba(0, 0, 0, .4);
  }

  .hero-mini-item {
    display: flex;
    align-items: center;
    gap: .7rem;
    padding: .7rem .9rem;
    border-radius: .8rem;
    background: rgba(255, 255, 255, .1);
    border: 1px solid rgba(255, 255, 255, .1);
    transition: background .2s ease, border-color .2s ease;
  }

  .hero-mini-item:hover {
    background: rgba(255, 255, 255, .2);
    border-color: rgba(255, 255, 255, .3);
  }

  .hero-mini-dot {
    width: .55rem;
    height: .55rem;
    border-radius: 9999px;
    background: #fb923c;
  }

  @media (max-width: 1024px) {
    .hero-panel {
      margin-top: 2rem;
      padding: 1.5rem;
    }
  }

  @media (min-width: 768px) and (max-width: 1024px) {
    .nav-desktop {
      display: none;
    }
  }

/* roulang page: category1 */
:root{
    --brand:#1a6ef0;
    --brand-dark:#143a85;
    --brand-light:#eef7ff;
    --ink:#1e293b;
    --ink-weak:#64748b;
    --line:#e2e8f0;
    --bg:#f8fafc;
    --card: 0 4px 24px rgba(15,37,77,0.06);
    --card-hover: 0 12px 40px rgba(15,37,77,0.14);
    --radius: 16px;
  }
  html{scroll-behavior:smooth}
  body{font-family:-apple-system,BlinkMacSystemFont,'Segoe UI','PingFang SC','Hiragino Sans GB','Microsoft YaHei',sans-serif; background:var(--bg); color:var(--ink); -webkit-font-smoothing:antialiased; line-height:1.6;}
  .container-x{max-width:1280px;margin-left:auto;margin-right:auto;padding-left:1.5rem;padding-right:1.5rem;}
  .nav-link-light{color:#94a3b8;font-weight:500;font-size:0.95rem;transition:color .25s,border-color .25s;padding:8px 2px;border-bottom:2px solid transparent;white-space:nowrap;}
  .nav-link-light:hover{color:#fff;border-color:rgba(255,255,255,.45)}
  .nav-link-light.active{color:#fff;border-color:#22d3ee}
  .footer-link{color:#94a3b8;transition:color .25s;font-size:.9rem;line-height:1.6}
  .footer-link:hover{color:#fff}
  .btn-primary{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;background:linear-gradient(135deg,#2563eb,#1e40af);color:#fff;font-weight:600;padding:.85rem 2rem;border-radius:999px;font-size:1rem;transition:all .3s;box-shadow:0 8px 24px rgba(37,99,235,.28);border:none;cursor:pointer;text-decoration:none}
  .btn-primary:hover{transform:translateY(-2px);box-shadow:0 12px 32px rgba(37,99,235,.36);color:#fff}
  .btn-secondary{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.22);color:#fff;font-weight:600;padding:.85rem 2rem;border-radius:999px;font-size:1rem;backdrop-filter:blur(8px);transition:all .3s;text-decoration:none}
  .btn-secondary:hover{background:rgba(255,255,255,.16);border-color:rgba(255,255,255,.4);transform:translateY(-2px);color:#fff}
  .btn-outline{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;border:1.5px solid var(--brand);color:var(--brand);background:transparent;font-weight:600;padding:.65rem 1.5rem;border-radius:999px;transition:all .3s;font-size:.95rem;text-decoration:none}
  .btn-outline:hover{background:var(--brand);color:#fff;box-shadow:0 8px 24px rgba(26,110,240,.25)}
  .card-base{background:#fff;border-radius:var(--radius);box-shadow:var(--card);border:1px solid rgba(226,232,240,.6);transition:transform .3s,box-shadow .3s}
  .card-base:hover{transform:translateY(-6px);box-shadow:var(--card-hover)}
  .section-title{font-size:2rem;font-weight:800;letter-spacing:-.02em;line-height:1.25;color:#0f254d}
  .section-sub{font-size:1.05rem;color:var(--ink-weak);max-width:680px;line-height:1.7}
  .badge{display:inline-flex;align-items:center;gap:6px;background:var(--brand-light);color:var(--brand-dark);font-size:13px;font-weight:600;padding:5px 14px;border-radius:999px;border:1px solid #dbeafe}
  .step-dot{width:48px;height:48px;border-radius:14px;display:flex;align-items:center;justify-content:center;font-weight:800;font-size:1.2rem;color:#fff;background:linear-gradient(135deg,#1a6ef0,#143a85);box-shadow:0 8px 20px rgba(26,110,240,.25)}
  .faq-item{background:#fff;border-radius:14px;border:1px solid #e8edf4;padding:22px 24px;transition:box-shadow .3s}
  .faq-item:hover{box-shadow:var(--card)}
  details summary::-webkit-details-marker{display:none}
  details summary{cursor:pointer;list-style:none}
  .hero-split{background:linear-gradient(135deg,#0b1e46 0%,#123a8a 55%,#1a6ef0 100%);position:relative;overflow:hidden}
  .hero-split::before{content:'';position:absolute;inset:0;background:url('/assets/images/backpic/back-1.png') no-repeat center right 0/55%;opacity:.18;mix-blend-mode:screen}
  .hero-split::after{content:'';position:absolute;top:-200px;right:-160px;width:520px;height:520px;border-radius:50%;background:radial-gradient(circle,rgba(34,211,238,.25),transparent 68%)}
  .active-bar{position:absolute;bottom:-1px;left:0;height:2px;background:#22d3ee;border-radius:2px}
  .entry-card{position:relative;padding:2rem;background:#fff;border-radius:20px;border:1px solid #edf1f7;box-shadow:0 4px 24px rgba(15,37,77,.05);transition:all .35s;overflow:hidden}
  .entry-card::before{content:'';position:absolute;top:0;left:0;right:0;height:4px;background:linear-gradient(90deg,#2563eb,#22d3ee);opacity:0;transition:opacity .3s}
  .entry-card:hover::before{opacity:1}
  .entry-card:hover{transform:translateY(-4px);box-shadow:0 12px 36px rgba(15,37,77,.12)}
  .timeline-item{position:relative;padding-left:32px}
  .timeline-item::before{content:'';position:absolute;left:8px;top:6px;width:14px;height:14px;border-radius:50%;background:linear-gradient(135deg,#1a6ef0,#22d3ee);border:3px solid #eff6ff}
  .fc-link{display:flex;align-items:center;gap:12px;padding:14px 18px;background:#f8fafc;border:1px solid #edf1f7;border-radius:12px;transition:all .25s;color:#1e293b;text-decoration:none}
  .fc-link:hover{background:#eef7ff;border-color:#bcd9ff;transform:translateX(4px)}
  .focus-ring:focus-visible{outline:3px solid rgba(34,211,238,.6);outline-offset:2px;border-radius:8px}
  @media (max-width:1280px){
    .hero-split::before{background-size:70%}
  }
  @media (max-width:1024px){
    .nav-desktop{display:none!important}
    .nav-mobile-toggle{display:flex!important}
  }
  @media (max-width:768px){
    .section-title{font-size:1.6rem}
    .hero-split::before{background-size:95%;opacity:.1}
    .container-x{padding-left:1.25rem;padding-right:1.25rem}
  }
  @media (max-width:520px){
    .section-title{font-size:1.35rem}
    .entry-card{padding:1.4rem}
  }

/* roulang page: category2 */
:root {
      --brand-primary: #2547eb;
      --brand-deep: #141a4d;
      --text-main: #0f172a;
      --text-soft: #475569;
      --text-muted: #94a3b8;
      --border-light: #e2e8f0;
      --bg-soft: #f8fafc;
      --radius-lg: 20px;
      --radius-md: 14px;
      --shadow-card: 0 2px 16px rgba(15, 23, 42, 0.06);
      --shadow-hover: 0 12px 36px rgba(37, 71, 235, 0.14);
    }
    * {
      box-sizing: border-box;
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
      color: var(--text-main);
      background: #ffffff;
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }
    .container-x {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 1.25rem;
      padding-right: 1.25rem;
    }
    @media (min-width: 1024px) {
      .container-x {
        padding-left: 2rem;
        padding-right: 2rem;
      }
    }
    .nav-link-light {
      position: relative;
      font-size: 0.925rem;
      font-weight: 500;
      color: rgba(255, 255, 255, 0.85);
      padding: 0.5rem 0.875rem;
      border-radius: 9999px;
      transition: all 0.3s ease;
      letter-spacing: 0.02em;
    }
    .nav-link-light:hover {
      color: #ffffff;
      background: rgba(255, 255, 255, 0.12);
    }
    .nav-link-light.active {
      color: #ffffff;
      background: rgba(255, 255, 255, 0.18);
      font-weight: 600;
      box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.2);
    }
    .footer-link {
      transition: all 0.3s ease;
      position: relative;
      font-size: 0.9rem;
    }
    .footer-link:hover {
      color: #ffffff;
      padding-left: 0.375rem;
    }
    .card-hover {
      transition: transform 0.35s ease, box-shadow 0.35s ease, border-color 0.35s ease;
      border: 1px solid var(--border-light);
    }
    .card-hover:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
      border-color: rgba(37, 71, 235, 0.25);
    }
    .tag-style {
      display: inline-flex;
      align-items: center;
      gap: 0.375rem;
      font-size: 0.75rem;
      font-weight: 500;
      padding: 0.25rem 0.75rem;
      border-radius: 9999px;
      background: #eef2ff;
      color: #2547eb;
      letter-spacing: 0.02em;
    }
    .btn-primary {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 0.5rem;
      background: var(--brand-primary);
      color: #ffffff;
      font-weight: 600;
      font-size: 0.95rem;
      padding: 0.75rem 1.625rem;
      border-radius: 9999px;
      border: 2px solid transparent;
      transition: all 0.3s ease;
      box-shadow: 0 4px 14px rgba(37, 71, 235, 0.25);
      cursor: pointer;
    }
    .btn-primary:hover {
      background: #1d36d1;
      transform: translateY(-2px);
      box-shadow: 0 8px 24px rgba(29, 54, 209, 0.35);
    }
    .btn-primary:active {
      transform: translateY(0);
      box-shadow: 0 2px 8px rgba(29, 54, 209, 0.3);
    }
    .btn-primary:focus-visible {
      outline: 3px solid rgba(37, 71, 235, 0.4);
      outline-offset: 2px;
    }
    .btn-ghost-light {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 0.5rem;
      background: rgba(255, 255, 255, 0.1);
      color: #ffffff;
      font-weight: 500;
      font-size: 0.95rem;
      padding: 0.75rem 1.625rem;
      border-radius: 9999px;
      border: 1px solid rgba(255, 255, 255, 0.3);
      backdrop-filter: blur(4px);
      transition: all 0.3s ease;
      cursor: pointer;
    }
    .btn-ghost-light:hover {
      background: rgba(255, 255, 255, 0.2);
      border-color: rgba(255, 255, 255, 0.5);
    }
    .btn-ghost-light:focus-visible {
      outline: 3px solid rgba(255, 255, 255, 0.3);
      outline-offset: 2px;
    }
    .section-title {
      font-size: 2rem;
      font-weight: 700;
      line-height: 1.2;
      letter-spacing: -0.02em;
      color: var(--text-main);
    }
    .section-sub {
      font-size: 1.05rem;
      color: var(--text-soft);
      line-height: 1.7;
    }
    .step-card {
      position: relative;
      border-radius: var(--radius-lg);
      padding: 1.75rem;
      background: #ffffff;
      border: 1px solid var(--border-light);
      box-shadow: var(--shadow-card);
      transition: all 0.35s ease;
    }
    .step-card:hover {
      box-shadow: var(--shadow-hover);
      border-color: rgba(37, 71, 235, 0.2);
    }
    .step-num {
      width: 48px;
      height: 48px;
      border-radius: 16px;
      background: linear-gradient(135deg, #608bfa 0%, #2547eb 100%);
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1.125rem;
      box-shadow: 0 6px 16px rgba(37, 71, 235, 0.25);
    }
    .faq-item {
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      padding: 1.25rem 1.5rem;
      transition: all 0.3s ease;
      background: #ffffff;
    }
    .faq-item:hover {
      border-color: rgba(37, 71, 235, 0.25);
      box-shadow: var(--shadow-card);
    }
    .info-card {
      border-radius: var(--radius-lg);
      background: #ffffff;
      overflow: hidden;
      transition: all 0.35s ease;
    }
    .cover-img {
      object-fit: cover;
      width: 100%;
      transition: transform 0.5s ease;
    }
    .cover-wrap:hover .cover-img {
      transform: scale(1.04);
    }
    .timeline-dot {
      width: 48px;
      height: 48px;
      border-radius: 9999px;
      display: flex;
      align-items: center;
      justify-content: center;
      background: #eef2ff;
      color: #2547eb;
      font-size: 1.1rem;
      flex-shrink: 0;
    }
    .stat-mini {
      border-radius: 16px;
      background: rgba(255, 255, 255, 0.08);
      backdrop-filter: blur(6px);
      padding: 1.25rem 1.5rem;
      border: 1px solid rgba(255, 255, 255, 0.15);
    }

    .mobile-menu {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
    }
    .mobile-menu.open {
      max-height: 420px;
    }

/* roulang page: category3 */
:root {
      --brand-50: #eef2ff;
      --brand-100: #e0e7ff;
      --brand-500: #6366f1;
      --brand-600: #4f46e5;
      --brand-700: #4338ca;
      --text-primary: #0f172a;
      --text-secondary: #475569;
      --text-muted: #94a3b8;
      --bg-body: #f8fafc;
      --border-subtle: #e2e8f0;
      --radius-card: 1rem;
      --shadow-card: 0 4px 24px rgba(15, 23, 42, 0.06);
      --shadow-hover: 0 12px 32px rgba(79, 70, 229, 0.14);
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      font-family: Inter, 'PingFang SC', 'Microsoft YaHei', system-ui, sans-serif;
      background: var(--bg-body);
      color: var(--text-primary);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    img {
      max-width: 100%;
      display: block;
    }
    button {
      border: none;
      background: none;
      cursor: pointer;
      font-family: inherit;
    }
    .nav-link-light {
      font-size: 0.875rem;
      font-weight: 500;
      color: rgba(255, 255, 255, 0.85);
      padding: 0.5rem 0.875rem;
      border-radius: 0.5rem;
      transition: all 0.25s ease;
      position: relative;
    }
    .nav-link-light:hover {
      color: #fff;
      background: rgba(255, 255, 255, 0.1);
    }
    .nav-link-light.active {
      color: #fff;
      font-weight: 600;
    }
    .nav-link-light.active::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0.875rem;
      right: 0.875rem;
      height: 2px;
      background: linear-gradient(90deg, #a5b4fc, #818cf8);
      border-radius: 2px;
    }
    .nav-link-mobile {
      display: block;
      padding: 0.75rem 1rem;
      font-size: 0.9rem;
      font-weight: 500;
      color: var(--text-secondary);
      border-radius: 0.6rem;
      transition: all 0.2s;
    }
    .nav-link-mobile:hover {
      background: var(--brand-50);
      color: var(--brand-700);
    }
    .nav-link-mobile.active {
      background: var(--brand-50);
      color: var(--brand-700);
      font-weight: 600;
    }
    .faq-card {
      background: #fff;
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      transition: all 0.3s ease;
    }
    .faq-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
      border-color: var(--brand-200);
    }
    .faq-item {
      background: #fff;
      border: 1px solid var(--border-subtle);
      border-radius: 0.75rem;
      transition: all 0.3s ease;
    }
    .faq-item:hover {
      border-color: var(--brand-300);
      box-shadow: 0 4px 20px rgba(79, 70, 229, 0.08);
    }
    .faq-item.active {
      border-color: var(--brand-300);
      box-shadow: 0 8px 28px rgba(79, 70, 229, 0.1);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
    }
    .faq-item.active .faq-answer {
      max-height: 600px;
    }
    .faq-item.active .faq-toggle i {
      transform: rotate(45deg);
      color: var(--brand-600);
    }
    .faq-toggle i {
      transition: transform 0.3s ease;
      color: #94a3b8;
    }
    .tag-badge {
      display: inline-flex;
      align-items: center;
      gap: 0.375rem;
      padding: 0.25rem 0.75rem;
      border-radius: 9999px;
      font-size: 0.75rem;
      font-weight: 500;
      background: var(--brand-50);
      color: var(--brand-700);
      border: 1px solid var(--brand-100);
    }
    .btn-primary {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 0.5rem;
      background: linear-gradient(135deg, var(--brand-600), var(--brand-700));
      color: #fff;
      font-weight: 500;
      padding: 0.75rem 1.75rem;
      border-radius: 0.75rem;
      transition: all 0.3s ease;
      box-shadow: 0 4px 16px rgba(79, 70, 229, 0.3);
    }
    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 8px 24px rgba(79, 70, 229, 0.4);
    }
    .btn-secondary {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 0.5rem;
      background: #fff;
      color: var(--brand-700);
      font-weight: 500;
      padding: 0.75rem 1.75rem;
      border-radius: 0.75rem;
      border: 1px solid var(--border-subtle);
      transition: all 0.3s ease;
    }
    .btn-secondary:hover {
      border-color: var(--brand-300);
      background: var(--brand-50);
    }
    .footer-link {
      font-size: 0.875rem;
      color: #94a3b8;
      transition: color 0.2s ease;
    }
    .footer-link:hover {
      color: #e2e8f0;
    }
    .step-number {
      width: 2.5rem;
      height: 2.5rem;
      border-radius: 0.75rem;
      background: linear-gradient(135deg, var(--brand-500), var(--brand-700));
      display: flex;
      align-items: center;
      justify-content: center;
      color: #fff;
      font-weight: 700;
      font-size: 1rem;
      box-shadow: 0 4px 12px rgba(79, 70, 229, 0.3);
    }
    a:focus-visible,
    button:focus-visible {
      outline: 2px solid var(--brand-500);
      outline-offset: 2px;
    }
    @media (max-width: 520px) {
      .hero-title {
        font-size: 1.75rem;
      }
    }

/* roulang page: article */
:root {
            --brand-50: #eff6ff;
            --brand-100: #dbeafe;
            --brand-600: #2563eb;
            --brand-700: #1d4ed8;
            --slate-50: #f8fafc;
            --slate-100: #f1f5f9;
            --slate-400: #94a3b8;
            --slate-500: #64748b;
            --slate-700: #334155;
            --slate-900: #0f172a;
            --border: #e2e8f0;
            --shadow-card: 0 2px 16px rgba(15,23,42,0.06);
            --shadow-hover: 0 12px 32px rgba(15,23,42,0.1);
            --shadow-brand: 0 8px 24px rgba(37,99,235,0.18);
            --radius: 1rem;
        }
        * { margin: 0; padding: 0; box-sizing: border-box; }
        html { scroll-behavior: smooth; }
        body {
            font-family: 'Inter', 'Noto Sans SC', system-ui, -apple-system, 'Segoe UI', sans-serif;
            background: #ffffff;
            color: var(--slate-900);
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
            text-rendering: optimizeLegibility;
        }
        a { text-decoration: none; color: inherit; transition: color .25s ease; }
        img { max-width: 100%; display: block; }
        button { border: none; background: none; cursor: pointer; font-family: inherit; }
        input, textarea { outline: none; }

        .site-header {
            background: rgba(255,255,255,0.88);
            backdrop-filter: blur(14px);
            -webkit-backdrop-filter: blur(14px);
            border-bottom: 1px solid rgba(226,232,240,0.65);
            transition: background .3s ease, box-shadow .3s ease;
        }
        .site-header.scrolled { box-shadow: 0 8px 30px rgba(15,23,42,0.07); }

        .nav-link-light {
            position: relative;
            font-size: .875rem;
            font-weight: 500;
            color: var(--slate-700);
            padding: .625rem 1rem;
            border-radius: .75rem;
            transition: all .25s ease;
            white-space: nowrap;
        }
        .nav-link-light:hover { color: var(--brand-600); background: var(--brand-50); }
        .nav-link-light.active { color: var(--brand-700); background: var(--brand-100); font-weight: 600; }

        .mobile-link {
            display: block;
            padding: .8rem 1rem;
            border-radius: .75rem;
            font-size: .95rem;
            font-weight: 500;
            color: var(--slate-700);
            transition: all .2s ease;
        }
        .mobile-link:hover { background: var(--slate-50); color: var(--brand-600); }
        .mobile-link.active { background: var(--brand-50); color: var(--brand-700); font-weight: 600; }

        .badge {
            display: inline-flex;
            align-items: center;
            gap: .375rem;
            padding: .35rem .85rem;
            border-radius: 999px;
            font-size: .75rem;
            font-weight: 600;
            letter-spacing: .02em;
            background: var(--brand-50);
            color: var(--brand-700);
            box-shadow: inset 0 0 0 1px rgba(37,99,235,.12);
        }
        .badge-light {
            background: rgba(255,255,255,.18);
            color: #fff;
            box-shadow: inset 0 0 0 1px rgba(255,255,255,.28);
            backdrop-filter: blur(6px);
        }

        .btn-primary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: .5rem;
            padding: .78rem 1.6rem;
            border-radius: .8rem;
            background: var(--brand-600);
            color: #fff;
            font-size: .875rem;
            font-weight: 600;
            line-height: 1.3;
            box-shadow: 0 4px 14px rgba(37,99,235,.22);
            transition: background .2s ease, box-shadow .2s ease, transform .2s ease;
        }
        .btn-primary:hover {
            background: var(--brand-700);
            color: #fff;
            box-shadow: var(--shadow-brand);
            transform: translateY(-2px);
        }
        .btn-primary:active { transform: translateY(0); }
        .btn-primary:focus-visible { outline: 2px solid var(--brand-600); outline-offset: 2px; box-shadow: 0 0 0 4px rgba(37,99,235,.15); }

        .btn-outline-light {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: .5rem;
            padding: .78rem 1.6rem;
            border-radius: .8rem;
            border: 1px solid rgba(255,255,255,.35);
            color: #fff;
            font-size: .875rem;
            font-weight: 600;
            background: rgba(255,255,255,.06);
            backdrop-filter: blur(8px);
            transition: all .25s ease;
        }
        .btn-outline-light:hover { background: rgba(255,255,255,.16); border-color: rgba(255,255,255,.6); color: #fff; transform: translateY(-2px); box-shadow: 0 8px 24px rgba(15,23,42,.3); }

        .card {
            background: #fff;
            border: 1px solid var(--border);
            border-radius: var(--radius);
            box-shadow: var(--shadow-card);
            transition: transform .3s ease, box-shadow .3s ease, border-color .3s ease;
        }
        .card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
            border-color: #bfdbfe;
        }

        .hero-gradient {
            background: linear-gradient(105deg, rgba(15,23,42,.95) 0%, rgba(15,23,42,.84) 40%, rgba(15,23,42,.5) 100%);
        }

        .breadcrumb {
            display: flex;
            align-items: center;
            flex-wrap: wrap;
            gap: .5rem;
            font-size: .8rem;
            color: rgba(255,255,255,.72);
        }
        .breadcrumb a { color: rgba(255,255,255,.78); transition: color .2s; }
        .breadcrumb a:hover { color: #fff; }
        .breadcrumb i { font-size: 10px; color: rgba(255,255,255,.4); }
        .breadcrumb span { color: #fff; max-width: 280px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

        .article-body { font-size: 1rem; line-height: 1.85; color: var(--slate-700); word-wrap: break-word; }
        .article-body h2 {
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--slate-900);
            margin: 2.2rem 0 1rem;
            padding-bottom: .5rem;
            border-bottom: 2px solid var(--brand-50);
        }
        .article-body h3 { font-size: 1.3rem; font-weight: 600; color: #1e293b; margin: 1.8rem 0 .75rem; }
        .article-body h4 { font-size: 1.1rem; font-weight: 600; color: #1e293b; margin: 1.5rem 0 .5rem; }
        .article-body p { margin-bottom: 1.25rem; }
        .article-body ul, .article-body ol { margin: 0 0 1.25rem 1.4rem; padding-left: .25rem; display: grid; gap: .375rem; }
        .article-body ul { list-style: disc; }
        .article-body ol { list-style: decimal; }
        .article-body a { color: var(--brand-600); font-weight: 500; text-decoration: underline; text-underline-offset: 3px; }
        .article-body a:hover { color: var(--brand-700); }
        .article-body img { border-radius: 1rem; margin: 1.5rem auto; box-shadow: 0 8px 24px rgba(15,23,42,.08); }
        .article-body blockquote {
            border-left: 4px solid var(--brand-600);
            background: var(--slate-50);
            padding: 1rem 1.25rem;
            margin: 1.5rem 0;
            border-radius: 0 .75rem .75rem 0;
            color: var(--slate-500);
            font-style: normal;
        }
        .article-body code { background: var(--slate-100); color: var(--brand-700); padding: .125rem .375rem; border-radius: .4rem; font-family: Consolas, Monaco, monospace; font-size: .9em; }
        .article-body pre { background: var(--slate-900); color: #e2e8f0; padding: 1rem 1.25rem; border-radius: .8rem; overflow-x: auto; margin: 1.5rem 0; }
        .article-body pre code { background: none; color: inherit; padding: 0; }
        .article-body table { width: 100%; border-collapse: collapse; margin: 1.5rem 0; font-size: .9rem; border-radius: .75rem; overflow: hidden; }
        .article-body th, .article-body td { border: 1px solid var(--border); padding: .625rem .875rem; text-align: left; }
        .article-body th { background: var(--slate-50); font-weight: 600; color: var(--slate-900); }

        .tag-chip {
            display: inline-flex;
            align-items: center;
            gap: .375rem;
            padding: .35rem .8rem;
            border-radius: .5rem;
            background: var(--slate-50);
            color: var(--slate-500);
            font-size: .78rem;
            font-weight: 500;
            transition: all .25s ease;
        }
        .tag-chip:hover { background: var(--brand-50); color: var(--brand-700); }

        .faq-item {
            background: #fff;
            border: 1px solid var(--border);
            border-radius: 1rem;
            box-shadow: 0 2px 12px rgba(15,23,42,.04);
            overflow: hidden;
            transition: border-color .3s ease, box-shadow .3s ease;
        }
        .faq-item summary { cursor: pointer; list-style: none; position: relative; }
        .faq-item summary::-webkit-details-marker { display: none; }
        .faq-item[open] { border-color: #bfdbfe; box-shadow: 0 6px 24px rgba(37,99,235,.08); }
        .faq-item[open] .fa-chevron-down { transform: rotate(180deg); }
        .faq-body { padding: 0 1.25rem 1.25rem; font-size: .875rem; color: var(--slate-500); line-height: 1.75; }

        .footer-link {
            font-size: .875rem;
            color: var(--slate-400);
            transition: color .25s ease, transform .25s ease;
            display: inline-block;
        }
        .footer-link:hover { color: #fff; transform: translateX(4px); }

        @media (max-width: 767px) {
            .article-body { font-size: .95rem; }
            .article-body h2 { font-size: 1.35rem; }
            .article-body h3 { font-size: 1.2rem; }
            .badge { font-size: .7rem; }
        }
        @media (max-width: 520px) {
            .article-body { font-size: .92rem; line-height: 1.75; }
            .breadcrumb span { max-width: 180px; }
            h1 { word-break: break-word; }
        }
        @media (max-width: 380px) {
            .nav-cta-hidden { display: none; }
        }