/* roulang page: index */
:root {
      --primary: #0EA5E9;
      --primary-dark: #0284C7;
      --accent: #F97316;
      --accent-hover: #EA580C;
      --dark-surface: #0F172A;
      --dark-card: #1E293B;
      --bg-light: #F8FAFC;
      --card-white: #FFFFFF;
      --text-main: #0F172A;
      --text-body: #334155;
      --text-muted: #64748B;
      --border-color: #E2E8F0;
      --radius-sm: 6px;
      --radius-md: 12px;
      --radius-full: 9999px;
      --shadow-sm: 0 2px 4px rgba(0,0,0,0.04);
      --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
      --shadow-lg: 0 12px 24px -4px rgba(0, 0, 0, 0.08);
      --transition: all 0.25s ease;
    }

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

    body {
      font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif;
      background-color: var(--bg-light);
      color: var(--text-body);
      line-height: 1.65;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

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

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

    button, input, select {
      font-family: inherit;
    }

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

    .section-padding {
      padding-top: 88px;
      padding-bottom: 88px;
    }

    .section-title-wrap {
      text-align: center;
      max-width: 820px;
      margin: 0 auto 56px auto;
    }

    .section-badge {
      display: inline-block;
      padding: 4px 14px;
      background: rgba(14, 165, 233, 0.1);
      color: var(--primary-dark);
      font-size: 13px;
      font-weight: 600;
      border-radius: var(--radius-full);
      margin-bottom: 12px;
      letter-spacing: 0.5px;
    }

    .section-title {
      font-size: 32px;
      font-weight: 700;
      color: var(--text-main);
      line-height: 1.35;
      margin-bottom: 16px;
    }

    .section-subtitle {
      font-size: 16px;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* Topbar & Navbar */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 999;
      background: #FFFFFF;
      box-shadow: 0 1px 3px rgba(0,0,0,0.05);
    }

    .top-bar {
      background-color: #F1F5F9;
      font-size: 13px;
      color: var(--text-muted);
      padding: 7px 0;
      border-bottom: 1px solid var(--border-color);
    }

    .top-bar .container {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .top-bar-left span {
      margin-right: 20px;
    }

    .main-nav {
      padding: 14px 0;
    }

    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .site-logo {
      font-size: 20px;
      font-weight: 800;
      color: var(--text-main);
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .site-logo span {
      background: var(--primary);
      color: #FFF;
      padding: 4px 8px;
      border-radius: 6px;
      font-size: 14px;
      font-weight: 700;
    }

    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
      list-style: none;
    }

    .nav-links a {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-body);
      transition: var(--transition);
      padding: 6px 0;
    }

    .nav-links a:hover {
      color: var(--primary);
    }

    .nav-cta-btn {
      background: var(--accent);
      color: #FFFFFF !important;
      padding: 10px 22px !important;
      border-radius: var(--radius-full);
      font-weight: 600 !important;
      transition: var(--transition);
      box-shadow: 0 4px 12px rgba(249, 115, 22, 0.25);
    }

    .nav-cta-btn:hover {
      background: var(--accent-hover);
      transform: translateY(-1px);
    }

    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      cursor: pointer;
      color: var(--text-main);
    }

    /* 1. Hero Section */
    .hero-banner {
      position: relative;
      background: linear-gradient(135deg, rgba(15, 23, 42, 0.88), rgba(15, 23, 42, 0.75)), url('/assets/images/90a92f4ea07af49a.webp') center/cover no-repeat;
      color: #FFFFFF;
      padding: 110px 0 90px 0;
      overflow: hidden;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1.15fr 0.85fr;
      gap: 48px;
      align-items: center;
    }

    .hero-title {
      font-size: 44px;
      font-weight: 800;
      line-height: 1.25;
      margin-bottom: 22px;
      letter-spacing: -0.5px;
    }

    .hero-desc {
      font-size: 17px;
      line-height: 1.75;
      color: #E2E8F0;
      margin-bottom: 36px;
    }

    .hero-actions {
      display: flex;
      gap: 16px;
      align-items: center;
      margin-bottom: 40px;
    }

    .btn-primary {
      background-color: var(--accent);
      color: #FFFFFF;
      padding: 14px 32px;
      border-radius: var(--radius-full);
      font-size: 16px;
      font-weight: 600;
      border: none;
      cursor: pointer;
      transition: var(--transition);
      display: inline-flex;
      align-items: center;
      justify-content: center;
    }

    .btn-primary:hover {
      background-color: var(--accent-hover);
      transform: translateY(-2px);
      box-shadow: 0 8px 16px rgba(249, 115, 22, 0.3);
    }

    .btn-secondary {
      background: rgba(255, 255, 255, 0.12);
      border: 1px solid rgba(255, 255, 255, 0.3);
      color: #FFFFFF;
      padding: 14px 28px;
      border-radius: var(--radius-full);
      font-size: 16px;
      font-weight: 500;
      cursor: pointer;
      transition: var(--transition);
    }

    .btn-secondary:hover {
      background: rgba(255, 255, 255, 0.22);
      color: #FFFFFF;
    }

    .hero-card-panel {
      background: rgba(255, 255, 255, 0.98);
      color: var(--text-main);
      padding: 32px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-lg);
    }

    .hero-card-panel h3 {
      font-size: 18px;
      margin-bottom: 18px;
      font-weight: 700;
      border-left: 4px solid var(--primary);
      padding-left: 10px;
    }

    .param-list {
      list-style: none;
      margin-bottom: 24px;
    }

    .param-list li {
      display: flex;
      justify-content: space-between;
      padding: 10px 0;
      border-bottom: 1px dashed var(--border-color);
      font-size: 14px;
    }

    .param-list li span:first-child {
      color: var(--text-muted);
    }

    .param-list li span:last-child {
      font-weight: 600;
      color: var(--text-main);
    }

    /* 2. Brand Intro */
    .brand-intro-section {
      background: #FFFFFF;
    }

    .brand-intro-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 56px;
      align-items: center;
    }

    .brand-intro-img {
      position: relative;
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-md);
    }

    .tech-specs-box {
      margin-top: 24px;
      background: #F8FAFC;
      border-left: 4px solid var(--primary);
      padding: 18px;
      border-radius: 4px;
      font-size: 14px;
      color: var(--text-body);
      line-height: 1.7;
    }

    /* 3. Core Advantages (6 Grid) */
    .advantages-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .advantage-card {
      background: var(--card-white);
      padding: 32px 28px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }

    .advantage-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-lg);
      border-color: rgba(14, 165, 233, 0.4);
    }

    .advantage-card .icon-box {
      width: 48px;
      height: 48px;
      background: rgba(14, 165, 233, 0.1);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      border-radius: 10px;
      font-size: 20px;
      font-weight: bold;
      margin-bottom: 20px;
    }

    .advantage-card h3 {
      font-size: 19px;
      margin-bottom: 12px;
      color: var(--text-main);
    }

    .advantage-card p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.65;
    }

    /* 4. Hot Modules */
    .modules-section {
      background: #FFFFFF;
    }

    .modules-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
    }

    .module-card {
      background: #FFFFFF;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      overflow: hidden;
      display: flex;
      flex-direction: column;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }

    .module-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-lg);
    }

    .module-cover {
      height: 200px;
      width: 100%;
      object-fit: cover;
    }

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

    .module-body h3 {
      font-size: 20px;
      margin-bottom: 12px;
      color: var(--text-main);
    }

    .module-body p {
      font-size: 14px;
      color: var(--text-muted);
      margin-bottom: 20px;
      line-height: 1.6;
    }

    .feature-points {
      list-style: none;
      margin-bottom: 24px;
      flex-grow: 1;
    }

    .feature-points li {
      font-size: 13px;
      color: var(--text-body);
      padding: 6px 0;
      border-bottom: 1px solid #F1F5F9;
      display: flex;
      align-items: center;
    }

    .feature-points li::before {
      content: "✓";
      color: var(--primary);
      margin-right: 8px;
      font-weight: bold;
    }

    .module-btn {
      display: block;
      text-align: center;
      background: #F8FAFC;
      color: var(--primary-dark);
      border: 1px solid var(--border-color);
      padding: 10px;
      border-radius: var(--radius-sm);
      font-size: 14px;
      font-weight: 600;
      transition: var(--transition);
    }

    .module-btn:hover {
      background: var(--primary);
      color: #FFFFFF;
      border-color: var(--primary);
    }

    /* 5. Dark Concept Section */
    .dark-concept-section {
      background: var(--dark-surface);
      color: #FFFFFF;
    }

    .dark-concept-section .section-title {
      color: #FFFFFF;
    }

    .dark-concept-section .section-subtitle {
      color: #94A3B8;
    }

    .timeline-chain {
      display: grid;
      grid-template-columns: repeat(5, 1fr);
      gap: 16px;
      margin-top: 48px;
      position: relative;
    }

    .chain-step {
      background: var(--dark-card);
      padding: 24px 20px;
      border-radius: var(--radius-md);
      border: 1px solid rgba(255, 255, 255, 0.08);
      position: relative;
    }

    .chain-step .step-num {
      display: inline-block;
      font-size: 20px;
      font-weight: 800;
      color: var(--accent);
      margin-bottom: 12px;
    }

    .chain-step h4 {
      font-size: 16px;
      margin-bottom: 8px;
      color: #FFFFFF;
    }

    .chain-step p {
      font-size: 13px;
      color: #94A3B8;
      line-height: 1.6;
    }

    /* 6. User Stories (Scenarios) */
    .scenario-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
    }

    .scenario-item {
      background: #FFFFFF;
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border-color);
      display: flex;
    }

    .scenario-img {
      width: 40%;
      object-fit: cover;
    }

    .scenario-content {
      width: 60%;
      padding: 28px;
      display: flex;
      flex-direction: column;
      justify-content: center;
    }

    .scenario-content h3 {
      font-size: 19px;
      margin-bottom: 10px;
      color: var(--text-main);
    }

    .scenario-content p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.65;
      margin-bottom: 14px;
    }

    .scenario-tag {
      align-self: flex-start;
      font-size: 12px;
      padding: 3px 10px;
      background: #EFF6FF;
      color: var(--primary);
      border-radius: 4px;
      font-weight: 600;
    }

    /* 7. Metric Stats */
    .metric-section {
      background: #FFFFFF;
      border-top: 1px solid var(--border-color);
      border-bottom: 1px solid var(--border-color);
      padding: 56px 0;
    }

    .metrics-row {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      text-align: center;
    }

    .metric-item {
      position: relative;
    }

    .metric-item:not(:last-child)::after {
      content: "";
      position: absolute;
      right: 0;
      top: 15%;
      height: 70%;
      width: 1px;
      background-color: var(--border-color);
    }

    .metric-number {
      font-size: 40px;
      font-weight: 800;
      color: var(--primary);
      line-height: 1.1;
      margin-bottom: 6px;
    }

    .metric-label {
      font-size: 14px;
      color: var(--text-muted);
      font-weight: 500;
    }

    /* 8. Comparison Matrix */
    .comparison-section {
      background: var(--bg-light);
    }

    .table-responsive {
      overflow-x: auto;
      background: #FFFFFF;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
      border: 1px solid var(--border-color);
    }

    .comparison-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      font-size: 14px;
    }

    .comparison-table th, .comparison-table td {
      padding: 18px 24px;
      border-bottom: 1px solid var(--border-color);
    }

    .comparison-table th {
      background: #F8FAFC;
      color: var(--text-main);
      font-weight: 600;
    }

    .comparison-table th.highlight-col, .comparison-table td.highlight-col {
      background: #F0F9FF;
      color: var(--primary-dark);
      font-weight: 600;
    }

    /* 9. Social Proof */
    .proof-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .proof-card {
      background: #FFFFFF;
      padding: 32px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

    .proof-rating {
      color: #F59E0B;
      font-size: 15px;
      margin-bottom: 14px;
    }

    .proof-text {
      font-size: 14px;
      color: var(--text-body);
      line-height: 1.7;
      margin-bottom: 20px;
      font-style: normal;
    }

    .proof-author {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .author-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: #E2E8F0;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: bold;
      color: var(--text-muted);
    }

    .author-info h4 {
      font-size: 14px;
      color: var(--text-main);
      margin-bottom: 2px;
    }

    .author-info p {
      font-size: 12px;
      color: var(--text-muted);
    }

    /* 10. Embedded News */
    .news-section {
      background: #FFFFFF;
    }

    .news-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .news-card {
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      background: #FFFFFF;
      transition: var(--transition);
    }

    .news-card:hover {
      border-color: var(--primary);
    }

    .news-date {
      font-size: 12px;
      color: var(--text-muted);
      margin-bottom: 8px;
    }

    .news-card h3 {
      font-size: 17px;
      margin-bottom: 12px;
      color: var(--text-main);
      line-height: 1.45;
    }

    .news-card p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 11. FAQ Section */
    .faq-container {
      max-width: 820px;
      margin: 0 auto;
    }

    .faq-item {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      margin-bottom: 14px;
      overflow: hidden;
    }

    .faq-question {
      padding: 18px 24px;
      width: 100%;
      text-align: left;
      background: none;
      border: none;
      font-size: 16px;
      font-weight: 600;
      color: var(--text-main);
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
    }

    .faq-question .arrow {
      transition: transform 0.3s ease;
      font-size: 14px;
      color: var(--text-muted);
    }

    .faq-question.active .arrow {
      transform: rotate(180deg);
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease;
      padding: 0 24px;
      color: var(--text-body);
      font-size: 14px;
      line-height: 1.7;
    }

    .faq-answer-inner {
      padding-bottom: 18px;
    }

    /* 12. Security Guarantee */
    .security-section {
      background: #F1F5F9;
      padding: 44px 0;
      border-top: 1px solid var(--border-color);
    }

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

    .security-badge-item {
      display: flex;
      align-items: center;
      gap: 14px;
    }

    .security-icon {
      width: 40px;
      height: 40px;
      background: #FFFFFF;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: bold;
      color: var(--primary);
      flex-shrink: 0;
      box-shadow: var(--shadow-sm);
    }

    .security-badge-item h4 {
      font-size: 15px;
      color: var(--text-main);
      margin-bottom: 2px;
    }

    .security-badge-item p {
      font-size: 12px;
      color: var(--text-muted);
    }

    /* 13. Bottom CTA */
    .bottom-cta-section {
      background: linear-gradient(135deg, #0284C7, #0369A1);
      color: #FFFFFF;
      text-align: center;
      padding: 80px 0;
    }

    .cta-box-inner {
      max-width: 680px;
      margin: 0 auto;
    }

    .cta-box-inner h2 {
      font-size: 34px;
      font-weight: 800;
      margin-bottom: 16px;
    }

    .cta-box-inner p {
      font-size: 16px;
      color: #E0F2FE;
      margin-bottom: 36px;
    }

    .cta-form {
      display: flex;
      gap: 12px;
      justify-content: center;
      flex-wrap: wrap;
    }

    .cta-form input, .cta-form select {
      padding: 14px 18px;
      border-radius: var(--radius-full);
      border: 1px solid rgba(255,255,255,0.4);
      outline: none;
      font-size: 15px;
      min-width: 200px;
    }

    .cta-form button {
      background: var(--accent);
      color: #FFFFFF;
      border: none;
      padding: 14px 34px;
      border-radius: var(--radius-full);
      font-size: 15px;
      font-weight: 700;
      cursor: pointer;
      transition: var(--transition);
    }

    .cta-form button:hover {
      background: var(--accent-hover);
    }

    /* Footer */
    .site-footer {
      background: #0B1120;
      color: #94A3B8;
      padding: 60px 0 30px 0;
      font-size: 14px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 48px;
      margin-bottom: 48px;
    }

    .footer-col h4 {
      color: #FFFFFF;
      font-size: 16px;
      margin-bottom: 20px;
      font-weight: 600;
    }

    .footer-col ul {
      list-style: none;
    }

    .footer-col ul li {
      margin-bottom: 10px;
    }

    .footer-col ul a {
      color: #94A3B8;
      transition: var(--transition);
    }

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

    .footer-bottom {
      border-top: 1px solid #1E293B;
      padding-top: 28px;
      text-align: center;
      font-size: 13px;
      color: #64748B;
    }

    /* Responsive */
    @media (max-width: 1024px) {
      .hero-grid {
        grid-template-columns: 1fr;
      }
      .brand-intro-grid {
        grid-template-columns: 1fr;
      }
      .advantages-grid, .modules-grid, .proof-grid, .news-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .timeline-chain {
        grid-template-columns: repeat(3, 1fr);
      }
      .scenario-grid {
        grid-template-columns: 1fr;
      }
      .security-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 768px) {
      .top-bar {
        display: none;
      }
      .mobile-menu-btn {
        display: block;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: #FFFFFF;
        flex-direction: column;
        padding: 20px;
        box-shadow: var(--shadow-lg);
        gap: 16px;
      }
      .nav-links.show {
        display: flex;
      }
      .hero-title {
        font-size: 30px;
      }
      .advantages-grid, .modules-grid, .proof-grid, .news-grid {
        grid-template-columns: 1fr;
      }
      .timeline-chain {
        grid-template-columns: 1fr;
      }
      .metrics-row {
        grid-template-columns: repeat(2, 1fr);
        gap: 32px 16px;
      }
      .metric-item:not(:last-child)::after {
        display: none;
      }
      .scenario-item {
        flex-direction: column;
      }
      .scenario-img, .scenario-content {
        width: 100%;
      }
      .security-grid {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .cta-form {
        flex-direction: column;
      }
      .cta-form input, .cta-form select, .cta-form button {
        width: 100%;
      }
    }