/* roulang page: index */
:root {
      --primary-navy: #0f2438;
      --navy-dark: #091624;
      --navy-light: #1b3855;
      --emerald-trust: #059669;
      --emerald-dark: #047857;
      --amber-risk: #d97706;
      --slate-bg: #f8fafc;
      --slate-card: #ffffff;
      --text-main: #1e293b;
      --text-muted: #64748b;
      --border-line: #e2e8f0;
      --radius-sm: 6px;
      --radius-md: 10px;
      --radius-lg: 16px;
      --shadow-sm: 0 1px 3px rgba(15, 36, 56, 0.05);
      --shadow-md: 0 8px 24px rgba(15, 36, 56, 0.08);
      --shadow-lg: 0 16px 36px rgba(15, 36, 56, 0.12);
      --transition: all 0.25s ease-in-out;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
      background-color: var(--slate-bg);
      color: var(--text-main);
      line-height: 1.6;
      font-size: 15px;
      overflow-x: hidden;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    ul, ol {
      list-style: none;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    .container {
      width: 100%;
      max-width: 1220px;
      margin: 0 auto;
      padding: 0 20px;
    }
    .top-bar {
      background: var(--navy-dark);
      color: #94a3b8;
      font-size: 13px;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
      padding: 8px 0;
    }
    .top-bar-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .top-bar-tags span {
      margin-right: 18px;
      display: inline-flex;
      align-items: center;
      gap: 5px;
    }
    .main-nav {
      position: sticky;
      top: 0;
      z-index: 99;
      background: #ffffff;
      box-shadow: 0 2px 10px rgba(15, 36, 56, 0.06);
      transition: var(--transition);
    }
    .nav-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      height: 70px;
    }
    .brand-logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 20px;
      font-weight: 700;
      color: var(--primary-navy);
      letter-spacing: -0.5px;
    }
    .brand-badge {
      font-size: 11px;
      background: #e0f2fe;
      color: #0369a1;
      padding: 2px 8px;
      border-radius: 4px;
      font-weight: 600;
    }
    .nav-links {
      display: flex;
      gap: 26px;
      align-items: center;
    }
    .nav-link {
      font-weight: 500;
      color: #334155;
      font-size: 14px;
      transition: var(--transition);
      position: relative;
      padding: 6px 0;
    }
    .nav-link:hover, .nav-link.active {
      color: var(--primary-navy);
    }
    .nav-link.active::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      right: 0;
      height: 2px;
      background: var(--emerald-trust);
    }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      padding: 10px 22px;
      font-size: 14px;
      font-weight: 600;
      border-radius: var(--radius-sm);
      transition: var(--transition);
      cursor: pointer;
      border: 1px solid transparent;
    }
    .btn-primary {
      background: var(--emerald-trust);
      color: #ffffff;
      box-shadow: 0 4px 14px rgba(5, 150, 105, 0.25);
    }
    .btn-primary:hover {
      background: var(--emerald-dark);
      transform: translateY(-1px);
    }
    .btn-outline {
      border-color: #cbd5e1;
      color: #334155;
      background: #ffffff;
    }
    .btn-outline:hover {
      border-color: var(--primary-navy);
      color: var(--primary-navy);
      background: #f1f5f9;
    }
    .btn-navy {
      background: var(--primary-navy);
      color: #ffffff;
    }
    .btn-navy:hover {
      background: var(--navy-light);
    }
    .section {
      padding: 80px 0;
      position: relative;
    }
    .section-alt {
      background-color: #ffffff;
    }
    .section-dark {
      background: var(--navy-dark);
      color: #e2e8f0;
    }
    .section-header {
      margin-bottom: 46px;
      max-width: 820px;
    }
    .section-tag {
      display: inline-block;
      font-size: 12px;
      font-weight: 700;
      letter-spacing: 1px;
      color: var(--emerald-trust);
      text-transform: uppercase;
      margin-bottom: 10px;
    }
    .section-title {
      font-size: 28px;
      font-weight: 700;
      color: var(--primary-navy);
      line-height: 1.35;
      margin-bottom: 14px;
    }
    .section-dark .section-title {
      color: #ffffff;
    }
    .section-desc {
      font-size: 15px;
      color: var(--text-muted);
      line-height: 1.7;
    }
    .section-dark .section-desc {
      color: #94a3b8;
    }
    .hero-compare {
      padding: 70px 0;
      background: linear-gradient(135deg, rgba(15, 36, 56, 0.94), rgba(9, 22, 36, 0.98)), url('/assets/images/fc23a90f07192695.png') center/cover no-repeat;
      color: #ffffff;
    }
    .hero-split-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 36px;
      margin-top: 36px;
    }
    .compare-side-card {
      background: rgba(255, 255, 255, 0.05);
      border: 1px solid rgba(255, 255, 255, 0.12);
      border-radius: var(--radius-lg);
      padding: 28px;
      backdrop-filter: blur(10px);
    }
    .compare-side-card.modern-glow {
      border-color: rgba(5, 150, 105, 0.45);
      background: rgba(5, 150, 105, 0.08);
      box-shadow: 0 10px 30px rgba(5, 150, 105, 0.15);
    }
    .badge-pill {
      display: inline-block;
      padding: 4px 12px;
      font-size: 12px;
      font-weight: 700;
      border-radius: 99px;
      margin-bottom: 16px;
    }
    .badge-gray {
      background: #475569;
      color: #f1f5f9;
    }
    .badge-emerald {
      background: var(--emerald-trust);
      color: #ffffff;
    }
    .kpi-row {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 14px;
      margin-top: 24px;
      padding-top: 20px;
      border-top: 1px solid rgba(255, 255, 255, 0.1);
    }
    .kpi-cell h4 {
      font-size: 24px;
      font-weight: 700;
      color: #34d399;
      font-family: monospace;
    }
    .kpi-cell span {
      font-size: 12px;
      color: #94a3b8;
    }
    .tier-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .tier-card {
      background: #ffffff;
      border: 1px solid var(--border-line);
      border-radius: var(--radius-lg);
      padding: 32px 26px;
      transition: var(--transition);
      position: relative;
    }
    .tier-card.featured {
      border-color: var(--emerald-trust);
      box-shadow: var(--shadow-lg);
      transform: translateY(-4px);
    }
    .tier-header {
      padding-bottom: 20px;
      margin-bottom: 20px;
      border-bottom: 1px solid var(--border-line);
    }
    .tier-name {
      font-size: 20px;
      font-weight: 700;
      color: var(--primary-navy);
      margin-bottom: 6px;
    }
    .tier-price {
      font-size: 28px;
      font-weight: 700;
      color: var(--emerald-trust);
      font-family: monospace;
    }
    .tier-feature-item {
      display: flex;
      align-items: flex-start;
      gap: 10px;
      margin-bottom: 12px;
      font-size: 14px;
      color: #475569;
    }
    .check-icon {
      color: var(--emerald-trust);
      font-weight: 700;
      flex-shrink: 0;
    }
    .pkg-table-wrap {
      background: #ffffff;
      border: 1px solid var(--border-line);
      border-radius: var(--radius-lg);
      overflow-x: auto;
    }
    .pkg-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
    }
    .pkg-table th, .pkg-table td {
      padding: 16px 22px;
      border-bottom: 1px solid var(--border-line);
    }
    .pkg-table th {
      background: #f8fafc;
      font-weight: 700;
      color: var(--primary-navy);
      font-size: 14px;
    }
    .pkg-table tr:last-child td {
      border-bottom: none;
    }
    .promo-banner {
      background: linear-gradient(100deg, var(--primary-navy), #1e3a5f);
      border-radius: var(--radius-lg);
      padding: 40px;
      color: #ffffff;
      display: flex;
      justify-content: space-between;
      align-items: center;
      gap: 30px;
    }
    .promo-content h3 {
      font-size: 22px;
      margin-bottom: 8px;
    }
    .fast-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .fast-card {
      background: #ffffff;
      border: 1px solid var(--border-line);
      border-radius: var(--radius-md);
      overflow: hidden;
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }
    .fast-card:hover {
      box-shadow: var(--shadow-md);
      border-color: #cbd5e1;
    }
    .fast-card img {
      height: 180px;
      width: 100%;
      object-fit: cover;
    }
    .fast-body {
      padding: 22px;
      flex-grow: 1;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .fast-body h4 {
      font-size: 17px;
      color: var(--primary-navy);
      margin-bottom: 8px;
    }
    .fast-body p {
      font-size: 13px;
      color: var(--text-muted);
      margin-bottom: 16px;
    }
    .review-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 22px;
    }
    .review-card {
      background: #ffffff;
      border: 1px solid var(--border-line);
      border-radius: var(--radius-md);
      padding: 24px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .review-content {
      font-size: 14px;
      color: #334155;
      margin-bottom: 18px;
      font-style: italic;
    }
    .review-author {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .review-meta h5 {
      font-size: 14px;
      font-weight: 700;
      color: var(--primary-navy);
    }
    .review-meta span {
      font-size: 12px;
      color: var(--text-muted);
    }
    .trust-strip {
      background: #f1f5f9;
      border-top: 1px solid var(--border-line);
      border-bottom: 1px solid var(--border-line);
      padding: 30px 0;
    }
    .trust-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      align-items: center;
    }
    .trust-item {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .trust-item-icon {
      width: 42px;
      height: 42px;
      background: #e2e8f0;
      border-radius: var(--radius-sm);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      color: var(--primary-navy);
    }
    .trust-item-text h5 {
      font-size: 14px;
      color: var(--primary-navy);
    }
    .trust-item-text p {
      font-size: 12px;
      color: var(--text-muted);
    }
    .insight-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .insight-card {
      background: #ffffff;
      border: 1px solid var(--border-line);
      border-radius: var(--radius-md);
      padding: 24px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      transition: var(--transition);
    }
    .insight-card:hover {
      border-color: var(--emerald-trust);
    }
    .insight-date {
      font-size: 12px;
      color: #94a3b8;
      margin-bottom: 8px;
    }
    .insight-title {
      font-size: 17px;
      font-weight: 700;
      color: var(--primary-navy);
      margin-bottom: 10px;
      line-height: 1.4;
    }
    .insight-excerpt {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 16px;
    }
    .algo-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 22px;
    }
    .algo-card {
      background: #ffffff;
      border: 1px solid var(--border-line);
      border-radius: var(--radius-md);
      padding: 24px;
      position: relative;
    }
    .algo-tag {
      font-size: 11px;
      padding: 2px 8px;
      background: #f1f5f9;
      color: #475569;
      border-radius: 4px;
      font-weight: 600;
      display: inline-block;
      margin-bottom: 12px;
    }
    .algo-title {
      font-size: 16px;
      font-weight: 700;
      color: var(--primary-navy);
      margin-bottom: 8px;
    }
    .algo-desc {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.6;
    }
    .metric-strip-card {
      background: #ffffff;
      border: 1px solid var(--border-line);
      border-radius: var(--radius-lg);
      padding: 36px 20px;
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      text-align: center;
    }
    .metric-num {
      font-size: 34px;
      font-weight: 800;
      color: var(--primary-navy);
      font-family: monospace;
      margin-bottom: 4px;
    }
    .metric-label {
      font-size: 13px;
      color: var(--text-muted);
    }
    .flow-steps {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      position: relative;
    }
    .flow-card {
      background: rgba(255, 255, 255, 0.04);
      border: 1px solid rgba(255, 255, 255, 0.1);
      border-radius: var(--radius-md);
      padding: 24px;
    }
    .flow-num {
      font-size: 28px;
      font-weight: 800;
      color: #34d399;
      font-family: monospace;
      margin-bottom: 10px;
    }
    .flow-title {
      font-size: 16px;
      color: #ffffff;
      margin-bottom: 8px;
      font-weight: 700;
    }
    .flow-desc {
      font-size: 13px;
      color: #94a3b8;
      line-height: 1.5;
    }
    .faq-flow-list {
      display: flex;
      flex-direction: column;
      gap: 14px;
      max-width: 900px;
      margin: 0 auto;
    }
    .faq-flow-item {
      background: #ffffff;
      border: 1px solid var(--border-line);
      border-radius: var(--radius-md);
      padding: 20px 24px;
    }
    .faq-flow-q {
      font-size: 16px;
      font-weight: 700;
      color: var(--primary-navy);
      margin-bottom: 8px;
      display: flex;
      align-items: center;
      gap: 10px;
    }
    .faq-flow-q span {
      background: #e0f2fe;
      color: #0284c7;
      padding: 2px 8px;
      font-size: 12px;
      border-radius: 4px;
    }
    .faq-flow-a {
      font-size: 14px;
      color: #475569;
      line-height: 1.6;
    }
    .cta-box {
      background: linear-gradient(135deg, #091624, #0f2438);
      border-radius: var(--radius-lg);
      padding: 50px;
      color: #ffffff;
      display: grid;
      grid-template-columns: 1.2fr 1fr;
      gap: 40px;
      align-items: center;
    }
    .form-wrap {
      background: #ffffff;
      padding: 30px;
      border-radius: var(--radius-md);
      color: var(--text-main);
    }
    .form-row {
      margin-bottom: 14px;
    }
    .form-row label {
      display: block;
      font-size: 13px;
      font-weight: 600;
      margin-bottom: 6px;
      color: #334155;
    }
    .form-input {
      width: 100%;
      padding: 10px 14px;
      border: 1px solid #cbd5e1;
      border-radius: var(--radius-sm);
      font-size: 14px;
      outline: none;
      transition: var(--transition);
    }
    .form-input:focus {
      border-color: var(--emerald-trust);
      box-shadow: 0 0 0 3px rgba(5, 150, 105, 0.15);
    }
    .site-footer {
      background: #091624;
      color: #94a3b8;
      padding: 60px 0 24px;
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      font-size: 13px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1fr;
      gap: 36px;
      margin-bottom: 40px;
    }
    .footer-col h4 {
      color: #ffffff;
      font-size: 15px;
      font-weight: 700;
      margin-bottom: 16px;
    }
    .footer-col ul li {
      margin-bottom: 10px;
    }
    .footer-col ul li a {
      color: #94a3b8;
      transition: var(--transition);
    }
    .footer-col ul li a:hover {
      color: #ffffff;
    }
    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      padding-top: 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 12px;
    }
    .menu-toggle {
      display: none;
      background: none;
      border: none;
      cursor: pointer;
      font-size: 22px;
      color: var(--primary-navy);
    }
    @media (max-width: 1024px) {
      .hero-split-grid, .cta-box {
        grid-template-columns: 1fr;
      }
      .tier-grid, .fast-grid, .review-grid, .insight-grid, .algo-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .metric-strip-card, .flow-steps, .trust-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 768px) {
      .menu-toggle {
        display: block;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 70px;
        left: 0;
        right: 0;
        background: #ffffff;
        flex-direction: column;
        padding: 20px;
        border-bottom: 1px solid var(--border-line);
        box-shadow: 0 10px 20px rgba(0,0,0,0.05);
      }
      .nav-links.active {
        display: flex;
      }
      .tier-grid, .fast-grid, .review-grid, .insight-grid, .algo-grid, .trust-grid, .flow-steps, .metric-strip-card, .footer-grid {
        grid-template-columns: 1fr;
      }
      .top-bar {
        display: none;
      }
      .section {
        padding: 50px 0;
      }
      .section-title {
        font-size: 24px;
      }
      .promo-banner {
        flex-direction: column;
        text-align: left;
      }
    }