/* roulang page: index */
:root {
      --primary: #1A56DB;
      --primary-hover: #1442a8;
      --accent: #0D9488;
      --accent-light: #CCFBF1;
      --bg-main: #F8FAFC;
      --bg-white: #FFFFFF;
      --bg-dark: #0F172A;
      --text-title: #0F172A;
      --text-body: #334155;
      --text-muted: #64748B;
      --border-color: #E2E8F0;
      --radius-sm: 6px;
      --radius-md: 10px;
      --radius-lg: 16px;
      --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.05);
      --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.06), 0 2px 4px -1px rgba(0, 0, 0, 0.04);
      --shadow-hover: 0 12px 28px -6px rgba(26, 86, 219, 0.12), 0 8px 10px -6px rgba(0, 0, 0, 0.05);
      --transition: all 0.28s cubic-bezier(0.4, 0, 0.2, 1);
    }
    *, *::before, *::after {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", "PingFang SC", "Noto Sans CJK SC", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-main);
      color: var(--text-body);
      line-height: 1.7;
      text-rendering: optimizeLegibility;
      -webkit-font-smoothing: antialiased;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      color: inherit;
      text-decoration: none;
      transition: var(--transition);
    }
    button, input, select, textarea {
      font-family: inherit;
      font-size: inherit;
      outline: none;
    }
    .container {
      width: 100%;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    .header-top {
      background-color: #EEF2F6;
      border-bottom: 1px solid var(--border-color);
      font-size: 13px;
      color: var(--text-muted);
      height: 38px;
      display: flex;
      align-items: center;
    }
    .header-top-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .header-top-links {
      display: flex;
      gap: 20px;
    }
    .header-top-links span {
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }
    .header-main {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: 0 2px 10px rgba(0, 0, 0, 0.03);
    }
    .navbar {
      height: 72px;
      display: flex;
      align-items: center;
      justify-content: space-between;
    }
    .brand-logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 20px;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: -0.5px;
    }
    .brand-logo svg {
      width: 32px;
      height: 32px;
      fill: var(--primary);
    }
    .nav-menu {
      display: flex;
      align-items: center;
      gap: 28px;
      list-style: none;
    }
    .nav-link {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-body);
      position: relative;
      padding: 6px 0;
    }
    .nav-link:hover, .nav-link.active {
      color: var(--primary);
    }
    .nav-link::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background-color: var(--primary);
      transition: var(--transition);
    }
    .nav-link:hover::after, .nav-link.active::after {
      width: 100%;
    }
    .nav-cta {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      background: var(--primary);
      color: #fff;
      padding: 10px 22px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      font-size: 14px;
      box-shadow: 0 4px 12px rgba(26, 86, 219, 0.25);
    }
    .nav-cta:hover {
      background: var(--primary-hover);
      transform: translateY(-1px);
    }
    .mobile-toggle {
      display: none;
      background: none;
      border: none;
      cursor: pointer;
      padding: 8px;
    }
    .mobile-toggle span {
      display: block;
      width: 24px;
      height: 2px;
      background-color: var(--text-title);
      margin: 5px 0;
      transition: var(--transition);
    }
    .section {
      padding: 92px 0;
      position: relative;
    }
    .section-alt {
      background-color: #FFFFFF;
      border-top: 1px solid var(--border-color);
      border-bottom: 1px solid var(--border-color);
    }
    .section-header {
      text-align: center;
      max-width: 820px;
      margin: 0 auto 56px;
    }
    .section-header.text-left {
      text-align: left;
      margin: 0 0 40px;
    }
    .section-tag {
      display: inline-block;
      font-size: 13px;
      font-weight: 600;
      color: var(--accent);
      background: var(--accent-light);
      padding: 4px 14px;
      border-radius: 20px;
      margin-bottom: 14px;
      text-transform: uppercase;
      letter-spacing: 0.5px;
    }
    .section-title {
      font-size: 32px;
      font-weight: 700;
      color: var(--text-title);
      line-height: 1.35;
      margin-bottom: 16px;
      letter-spacing: -0.5px;
    }
    .section-subtitle {
      font-size: 16px;
      color: var(--text-muted);
      line-height: 1.8;
    }
    .hero-section {
      background: linear-gradient(180deg, #F0F5FF 0%, #F8FAFC 100%);
      padding: 60px 0 100px;
      overflow: hidden;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1.15fr 0.85fr;
      gap: 48px;
      align-items: center;
    }
    .hero-content h1 {
      font-size: 42px;
      font-weight: 800;
      line-height: 1.25;
      color: var(--text-title);
      margin-bottom: 22px;
      letter-spacing: -1px;
    }
    .hero-content p {
      font-size: 16px;
      color: var(--text-body);
      line-height: 1.85;
      margin-bottom: 32px;
      text-align: justify;
    }
    .hero-cta-group {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      align-items: center;
      margin-bottom: 36px;
    }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 13px 28px;
      border-radius: var(--radius-sm);
      font-size: 15px;
      font-weight: 600;
      transition: var(--transition);
      cursor: pointer;
      border: 1px solid transparent;
    }
    .btn-primary {
      background-color: var(--primary);
      color: #fff;
      box-shadow: 0 4px 14px rgba(26, 86, 219, 0.28);
    }
    .btn-primary:hover {
      background-color: var(--primary-hover);
      transform: translateY(-2px);
    }
    .btn-secondary {
      background-color: #fff;
      color: var(--primary);
      border-color: var(--border-color);
      box-shadow: var(--shadow-sm);
    }
    .btn-secondary:hover {
      border-color: var(--primary);
      background-color: #F8FAFC;
    }
    .hero-badges {
      display: flex;
      gap: 24px;
      border-top: 1px solid var(--border-color);
      padding-top: 24px;
    }
    .badge-item {
      display: flex;
      flex-direction: column;
    }
    .badge-num {
      font-size: 24px;
      font-weight: 700;
      color: var(--text-title);
    }
    .badge-text {
      font-size: 13px;
      color: var(--text-muted);
    }
    .hero-stacked-wrapper {
      position: relative;
      height: 480px;
    }
    .stack-card {
      position: absolute;
      border-radius: var(--radius-lg);
      background: #FFFFFF;
      box-shadow: 0 20px 40px -15px rgba(0, 0, 0, 0.12);
      border: 1px solid var(--border-color);
      transition: var(--transition);
      overflow: hidden;
    }
    .stack-main {
      width: 90%;
      top: 0;
      left: 0;
      z-index: 3;
    }
    .stack-main:hover {
      transform: translateY(-4px);
    }
    .stack-sub-1 {
      width: 75%;
      top: 140px;
      right: 0;
      z-index: 4;
      border-left: 4px solid var(--accent);
    }
    .stack-sub-1:hover {
      transform: translateY(-4px) scale(1.02);
    }
    .stack-sub-2 {
      width: 65%;
      bottom: 0;
      left: 40px;
      z-index: 5;
      border-left: 4px solid var(--primary);
    }
    .stack-header {
      padding: 14px 18px;
      background: #F8FAFC;
      border-bottom: 1px solid var(--border-color);
      font-size: 13px;
      font-weight: 600;
      color: var(--text-title);
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .stack-body {
      padding: 16px 20px;
    }
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 36px;
    }
    .feature-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 32px 26px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      position: relative;
    }
    .feature-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
      border-color: #BFDBFE;
    }
    .feature-icon-box {
      width: 52px;
      height: 52px;
      border-radius: var(--radius-sm);
      background: #EFF6FF;
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
    }
    .feature-icon-box svg {
      width: 26px;
      height: 26px;
      fill: currentColor;
    }
    .feature-card h3 {
      font-size: 19px;
      font-weight: 700;
      color: var(--text-title);
      margin-bottom: 12px;
    }
    .feature-card p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
      text-align: justify;
    }
    .progress-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px;
      box-shadow: var(--shadow-sm);
    }
    .progress-header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      margin-bottom: 12px;
    }
    .progress-tag {
      font-size: 12px;
      font-weight: 600;
      padding: 3px 10px;
      border-radius: 12px;
    }
    .tag-active {
      background: #E0E7FF;
      color: var(--primary);
    }
    .tag-plan {
      background: #FEF3C7;
      color: #D97706;
    }
    .progress-bar-bg {
      height: 8px;
      background: #F1F5F9;
      border-radius: 4px;
      overflow: hidden;
      margin-top: 14px;
      margin-bottom: 8px;
    }
    .progress-bar-fill {
      height: 100%;
      background: linear-gradient(90deg, var(--primary) 0%, var(--accent) 100%);
      border-radius: 4px;
    }
    .section-dark {
      background-color: var(--bg-dark);
      color: #E2E8F0;
    }
    .section-dark .section-title {
      color: #FFFFFF;
    }
    .section-dark .section-subtitle {
      color: #94A3B8;
    }
    .dark-hub-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
    }
    .dark-hub-item {
      padding: 20px;
      border-radius: var(--radius-md);
      background: rgba(255, 255, 255, 0.04);
      border: 1px solid rgba(255, 255, 255, 0.1);
      margin-bottom: 16px;
      transition: var(--transition);
    }
    .dark-hub-item:hover {
      background: rgba(255, 255, 255, 0.08);
      border-color: var(--accent);
    }
    .dark-hub-item h4 {
      font-size: 17px;
      color: #FFFFFF;
      margin-bottom: 8px;
    }
    .dark-hub-item p {
      font-size: 14px;
      color: #94A3B8;
      line-height: 1.65;
    }
    .metric-bar {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 36px 40px;
      box-shadow: var(--shadow-sm);
    }
    .metric-col {
      text-align: center;
      border-right: 1px solid var(--border-color);
    }
    .metric-col:last-child {
      border-right: none;
    }
    .metric-val {
      font-size: 38px;
      font-weight: 800;
      color: var(--primary);
      line-height: 1.1;
      margin-bottom: 8px;
    }
    .metric-label {
      font-size: 14px;
      color: var(--text-muted);
      font-weight: 500;
    }
    .case-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
    }
    .case-img-box {
      height: 220px;
      overflow: hidden;
      position: relative;
    }
    .case-img-box img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: var(--transition);
    }
    .case-card:hover .case-img-box img {
      transform: scale(1.05);
    }
    .case-content {
      padding: 26px;
      flex-grow: 1;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .case-tag {
      font-size: 12px;
      color: var(--primary);
      font-weight: 600;
      margin-bottom: 8px;
      display: block;
    }
    .case-content h3 {
      font-size: 18px;
      color: var(--text-title);
      margin-bottom: 12px;
      line-height: 1.45;
    }
    .case-quote {
      font-size: 14px;
      color: var(--text-muted);
      font-style: italic;
      border-left: 2px solid var(--accent);
      padding-left: 12px;
      margin-top: 16px;
    }
    .timeline {
      position: relative;
      max-width: 900px;
      margin: 0 auto;
    }
    .timeline::before {
      content: '';
      position: absolute;
      top: 0;
      bottom: 0;
      left: 140px;
      width: 2px;
      background: var(--border-color);
    }
    .timeline-item {
      position: relative;
      margin-bottom: 36px;
      display: flex;
      align-items: flex-start;
    }
    .timeline-date {
      width: 120px;
      text-align: right;
      font-size: 14px;
      font-weight: 700;
      color: var(--primary);
      padding-top: 2px;
    }
    .timeline-point {
      width: 12px;
      height: 12px;
      border-radius: 50%;
      background: var(--primary);
      margin: 6px 20px 0 14px;
      position: relative;
      z-index: 2;
      border: 3px solid #FFFFFF;
      box-shadow: 0 0 0 2px var(--primary);
    }
    .timeline-box {
      flex-grow: 1;
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      padding: 20px 24px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
    }
    .timeline-box h4 {
      font-size: 16px;
      color: var(--text-title);
      margin-bottom: 8px;
    }
    .timeline-box ul {
      margin-left: 18px;
      font-size: 14px;
      color: var(--text-muted);
    }
    .news-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .news-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .news-card img {
      width: 100%;
      height: 190px;
      object-fit: cover;
    }
    .news-body {
      padding: 22px;
    }
    .news-date {
      font-size: 12px;
      color: var(--text-muted);
      margin-bottom: 8px;
      display: block;
    }
    .news-body h3 {
      font-size: 17px;
      color: var(--text-title);
      margin-bottom: 10px;
      line-height: 1.45;
    }
    .news-body p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.65;
    }
    .faq-container {
      max-width: 820px;
      margin: 0 auto;
    }
    .faq-item {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      margin-bottom: 14px;
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }
    .faq-header {
      padding: 18px 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      user-select: none;
      font-weight: 600;
      font-size: 16px;
      color: var(--text-title);
    }
    .faq-icon {
      width: 20px;
      height: 20px;
      transition: transform 0.28s ease;
      fill: var(--text-muted);
    }
    .faq-body {
      padding: 0 24px;
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s cubic-bezier(0, 1, 0, 1), padding 0.3s ease;
      color: var(--text-muted);
      font-size: 14px;
      line-height: 1.75;
    }
    .faq-item.active .faq-body {
      padding: 0 24px 20px;
      max-height: 400px;
      transition: max-height 0.3s cubic-bezier(1, 0, 1, 0), padding 0.3s ease;
    }
    .faq-item.active .faq-icon {
      transform: rotate(180deg);
      fill: var(--primary);
    }
    .guarantee-bar {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      margin-top: 50px;
    }
    .guarantee-item {
      display: flex;
      align-items: flex-start;
      gap: 16px;
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      padding: 22px;
      border-radius: var(--radius-md);
    }
    .guarantee-icon {
      width: 44px;
      height: 44px;
      border-radius: 8px;
      background: #F0FDF4;
      color: var(--accent);
      display: flex;
      align-items: center;
      justify-content: center;
      flex-shrink: 0;
    }
    .guarantee-icon svg {
      width: 22px;
      height: 22px;
      fill: currentColor;
    }
    .guarantee-item h4 {
      font-size: 15px;
      font-weight: 700;
      color: var(--text-title);
      margin-bottom: 4px;
    }
    .guarantee-item p {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.5;
    }
    .lead-section {
      background: linear-gradient(135deg, #1A56DB 0%, #1E40AF 100%);
      color: #FFFFFF;
      border-radius: var(--radius-lg);
      padding: 64px 50px;
      box-shadow: 0 20px 40px -10px rgba(26, 86, 219, 0.3);
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 50px;
      align-items: center;
    }
    .lead-text h2 {
      font-size: 32px;
      font-weight: 700;
      margin-bottom: 16px;
      line-height: 1.35;
    }
    .lead-text p {
      font-size: 15px;
      color: #DBEAFE;
      line-height: 1.8;
      margin-bottom: 24px;
    }
    .contact-item {
      display: flex;
      align-items: center;
      gap: 12px;
      font-size: 15px;
      margin-bottom: 12px;
    }
    .lead-form-box {
      background: #FFFFFF;
      padding: 32px;
      border-radius: var(--radius-md);
      color: var(--text-body);
      box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
    }
    .lead-form-box h3 {
      font-size: 20px;
      color: var(--text-title);
      margin-bottom: 20px;
      font-weight: 700;
      text-align: center;
    }
    .form-group {
      margin-bottom: 16px;
    }
    .form-label {
      display: block;
      font-size: 13px;
      font-weight: 600;
      color: var(--text-title);
      margin-bottom: 6px;
    }
    .form-input {
      width: 100%;
      height: 44px;
      padding: 0 14px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      font-size: 14px;
      transition: var(--transition);
      background: #F8FAFC;
    }
    .form-input:focus {
      background: #FFFFFF;
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(26, 86, 219, 0.15);
    }
    .form-submit-btn {
      width: 100%;
      height: 46px;
      background: var(--primary);
      color: #FFFFFF;
      border: none;
      border-radius: var(--radius-sm);
      font-weight: 600;
      font-size: 15px;
      cursor: pointer;
      transition: var(--transition);
      margin-top: 10px;
    }
    .form-submit-btn:hover {
      background: var(--primary-hover);
    }
    .site-footer {
      background: #0B1329;
      color: #94A3B8;
      font-size: 14px;
      padding-top: 70px;
      border-top: 1px solid rgba(255, 255, 255, 0.08);
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 40px;
      margin-bottom: 50px;
    }
    .footer-logo {
      font-size: 20px;
      font-weight: 700;
      color: #FFFFFF;
      margin-bottom: 16px;
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }
    .footer-logo svg {
      width: 28px;
      height: 28px;
      fill: var(--primary);
    }
    .footer-desc {
      font-size: 14px;
      line-height: 1.8;
      margin-bottom: 20px;
    }
    .footer-title {
      font-size: 16px;
      font-weight: 700;
      color: #FFFFFF;
      margin-bottom: 20px;
      letter-spacing: -0.2px;
    }
    .footer-links {
      list-style: none;
    }
    .footer-links li {
      margin-bottom: 12px;
    }
    .footer-links a:hover {
      color: #FFFFFF;
      padding-left: 4px;
    }
    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      padding: 24px 0;
      font-size: 13px;
      text-align: center;
    }
    .footer-bottom-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 12px;
    }
    @media (max-width: 1024px) {
      .grid-4 {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
      .lead-section {
        grid-template-columns: 1fr;
        padding: 40px 30px;
      }
      .hero-grid {
        grid-template-columns: 1fr;
        gap: 40px;
      }
      .hero-stacked-wrapper {
        height: 380px;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
      .guarantee-bar {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 768px) {
      .header-top {
        display: none;
      }
      .mobile-toggle {
        display: block;
      }
      .nav-menu {
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #FFFFFF;
        flex-direction: column;
        align-items: flex-start;
        padding: 20px 24px;
        box-shadow: 0 10px 20px rgba(0, 0, 0, 0.08);
        border-bottom: 1px solid var(--border-color);
        display: none;
        gap: 16px;
      }
      .nav-menu.show {
        display: flex;
      }
      .nav-link {
        width: 100%;
        padding: 8px 0;
      }
      .nav-cta {
        display: none;
      }
      .section {
        padding: 60px 0;
      }
      .hero-content h1 {
        font-size: 30px;
      }
      .section-title {
        font-size: 26px;
      }
      .grid-3, .grid-2 {
        grid-template-columns: 1fr;
      }
      .hero-stacked-wrapper {
        display: none;
      }
      .timeline::before {
        left: 20px;
      }
      .timeline-item {
        flex-direction: column;
      }
      .timeline-date {
        text-align: left;
        padding-left: 45px;
        margin-bottom: 8px;
      }
      .timeline-point {
        position: absolute;
        left: 15px;
        top: 2px;
        margin: 0;
      }
      .timeline-box {
        margin-left: 45px;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .guarantee-bar {
        grid-template-columns: 1fr;
      }
      .metric-bar {
        padding: 24px 16px;
      }
      .metric-col {
        border-right: none;
        border-bottom: 1px solid var(--border-color);
        padding-bottom: 16px;
        margin-bottom: 16px;
      }
      .metric-col:last-child {
        border-bottom: none;
        padding-bottom: 0;
        margin-bottom: 0;
      }
      .dark-hub-grid {
        grid-template-columns: 1fr;
      }
    }