/* CSS Variables - 高亮度鲜活风 */
    :root {
      --primary: #0062ff;
      --primary-hover: #0052d4;
      --secondary: #10b981;
      --accent: #f59e0b;
      --dark-gray: #1e293b;
      --text-main: #334155;
      --text-muted: #64748b;
      --bg-base: #f8fafc;
      --bg-card: #ffffff;
      --border-color: #e2e8f0;
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.05);
      --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.05), 0 2px 4px -1px rgba(0,0,0,0.03);
      --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.05), 0 4px 6px -2px rgba(0, 0, 0, 0.02);
      --radius: 12px;
      --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    }

    /* Reset & Base */
    * { box-sizing: border-box; margin: 0; padding: 0; }
    html { scroll-behavior: smooth; font-size: 16px; }
    body {
      font-family: var(--font);
      background-color: var(--bg-base);
      color: var(--text-main);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }
    a { color: var(--primary); text-decoration: none; transition: color 0.2s ease; }
    a:hover { color: var(--primary-hover); }
    img { max-width: 100%; height: auto; display: block; }
    ul { list-style: none; }
    button, input, select, textarea { font-family: inherit; font-size: inherit; }

    /* Layout Containers */
    .container {
      width: 100%;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    section {
      padding: 80px 0;
      border-bottom: 1px solid var(--border-color);
      position: relative;
      background-color: var(--bg-card);
    }
    section:nth-child(even) {
      background-color: var(--bg-base);
    }

    /* Common Typography */
    .section-title {
      font-size: 2.2rem;
      font-weight: 700;
      color: var(--dark-gray);
      text-align: center;
      margin-bottom: 16px;
      letter-spacing: -0.5px;
    }
    .section-subtitle {
      font-size: 1.1rem;
      color: var(--text-muted);
      text-align: center;
      max-width: 700px;
      margin: 0 auto 50px auto;
    }

    /* Header & Navigation */
    header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background-color: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(8px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }
    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      height: 70px;
    }
    .logo-area {
      display: flex;
      align-items: center;
      gap: 10px;
    }
    .ai-page-logo {
      height: 40px;
      width: auto;
    }
    .nav-brand {
      font-size: 1.3rem;
      font-weight: 700;
      color: var(--dark-gray);
    }
    .nav-menu {
      display: flex;
      gap: 24px;
      align-items: center;
    }
    .nav-item {
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--text-main);
      padding: 8px 4px;
      border-bottom: 2px solid transparent;
      transition: all 0.2s ease;
    }
    .nav-item:hover, .nav-item.active {
      color: var(--primary);
      border-bottom-color: var(--primary);
    }
    .nav-btn {
      background-color: var(--primary);
      color: #fff;
      padding: 8px 18px;
      border-radius: 6px;
      font-weight: 500;
      transition: background-color 0.2s ease;
    }
    .nav-btn:hover {
      background-color: var(--primary-hover);
      color: #fff;
    }
    .menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.5rem;
      cursor: pointer;
      color: var(--dark-gray);
    }

    /* Hero Section (No Image, Text & Data Blocks) */
    .hero-section {
      background: radial-gradient(circle at 90% 10%, #eff6ff 0%, #ffffff 60%);
      padding: 100px 0 80px 0;
      text-align: center;
    }
    .hero-badge {
      display: inline-block;
      background-color: #dbeafe;
      color: var(--primary);
      padding: 6px 16px;
      border-radius: 50px;
      font-size: 0.9rem;
      font-weight: 600;
      margin-bottom: 24px;
    }
    .hero-h1 {
      font-size: 2.8rem;
      line-height: 1.25;
      font-weight: 800;
      color: var(--dark-gray);
      max-width: 900px;
      margin: 0 auto 20px auto;
    }
    .hero-desc {
      font-size: 1.2rem;
      color: var(--text-muted);
      max-width: 750px;
      margin: 0 auto 35px auto;
    }
    .hero-actions {
      display: flex;
      justify-content: center;
      gap: 16px;
      margin-bottom: 50px;
      flex-wrap: wrap;
    }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 14px 28px;
      border-radius: var(--radius);
      font-weight: 600;
      transition: transform 0.2s ease, box-shadow 0.2s ease, background-color 0.2s ease;
      cursor: pointer;
      border: none;
    }
    .btn:active {
      transform: scale(0.98);
    }
    .btn-primary {
      background-color: var(--primary);
      color: white;
      box-shadow: 0 4px 14px rgba(0, 98, 255, 0.3);
    }
    .btn-primary:hover {
      background-color: var(--primary-hover);
      color: white;
      box-shadow: 0 6px 20px rgba(0, 98, 255, 0.4);
    }
    .btn-secondary {
      background-color: white;
      color: var(--dark-gray);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }
    .btn-secondary:hover {
      background-color: var(--bg-base);
      box-shadow: var(--shadow-md);
    }

    /* Grid Layouts & Cards */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
      gap: 24px;
    }
    .grid-4 {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
      gap: 20px;
    }
    .card {
      background-color: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 30px;
      transition: transform 0.2s ease, box-shadow 0.2s ease;
      position: relative;
    }
    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-lg);
    }
    .card-icon {
      width: 48px;
      height: 48px;
      background-color: #eff6ff;
      color: var(--primary);
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.5rem;
      margin-bottom: 20px;
    }

    /* Data Stats Component */
    .stats-container {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
      gap: 20px;
      max-width: 960px;
      margin: 0 auto;
    }
    .stat-card {
      background: white;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 24px;
      box-shadow: var(--shadow-sm);
    }
    .stat-num {
      font-size: 2.2rem;
      font-weight: 800;
      color: var(--primary);
      line-height: 1;
      margin-bottom: 8px;
    }
    .stat-label {
      font-size: 0.95rem;
      color: var(--text-muted);
      font-weight: 500;
    }

    /* Service Cap Grid (AIGC capabilities) */
    .service-badge {
      display: inline-block;
      font-size: 0.75rem;
      padding: 2px 8px;
      background-color: #ecfdf5;
      color: var(--secondary);
      border-radius: 4px;
      margin-bottom: 8px;
      font-weight: 600;
    }

    /* Tag Cloud */
    .tag-cloud {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      max-width: 850px;
      margin: 0 auto 40px auto;
    }
    .tag-item {
      background-color: white;
      border: 1px solid var(--border-color);
      color: var(--text-main);
      padding: 6px 14px;
      border-radius: 20px;
      font-size: 0.85rem;
      transition: all 0.2s ease;
      font-weight: 500;
    }
    .tag-item:hover {
      background-color: var(--primary);
      color: white;
      border-color: var(--primary);
    }

    /* Steps Layout */
    .steps-timeline {
      display: flex;
      flex-direction: column;
      gap: 30px;
      max-width: 800px;
      margin: 0 auto;
    }
    .step-item {
      display: flex;
      gap: 20px;
      background: white;
      padding: 24px;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      align-items: flex-start;
    }
    .step-num {
      width: 40px;
      height: 40px;
      background-color: var(--primary);
      color: white;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      flex-shrink: 0;
    }
    .step-content h3 {
      font-size: 1.15rem;
      color: var(--dark-gray);
      margin-bottom: 6px;
    }
    .step-content p {
      color: var(--text-muted);
      font-size: 0.95rem;
    }

    /* Compare Table */
    .table-responsive {
      overflow-x: auto;
      margin-bottom: 30px;
      background: white;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }
    table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 600px;
    }
    th, td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
    }
    th {
      background-color: #f1f5f9;
      color: var(--dark-gray);
      font-weight: 600;
    }
    tr:last-child td {
      border-bottom: none;
    }
    .highlight-row {
      background-color: #f0f7ff;
    }
    .star-rating {
      color: var(--accent);
      font-size: 1.1rem;
    }
    .badge-score {
      background-color: #fffbeb;
      color: #d97706;
      font-weight: 700;
      padding: 2px 8px;
      border-radius: 4px;
      border: 1px solid #fef3c7;
    }

    /* FAQ Accordion */
    .faq-container {
      max-width: 850px;
      margin: 0 auto;
    }
    .faq-item {
      background-color: white;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      margin-bottom: 12px;
      overflow: hidden;
      transition: border-color 0.2s ease;
    }
    .faq-header {
      padding: 18px 24px;
      font-weight: 600;
      color: var(--dark-gray);
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      user-select: none;
    }
    .faq-header::after {
      content: '+';
      font-size: 1.4rem;
      color: var(--text-muted);
      transition: transform 0.2s ease;
    }
    .faq-item.active {
      border-color: var(--primary);
    }
    .faq-item.active .faq-header::after {
      content: '-';
      transform: rotate(180deg);
    }
    .faq-body {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease-out;
      background-color: #fafafa;
    }
    .faq-content {
      padding: 0 24px 20px 24px;
      color: var(--text-main);
      font-size: 0.95rem;
    }

    /* Testimonials Grid */
    .comments-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 24px;
    }
    .comment-card {
      background-color: white;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 24px;
      box-shadow: var(--shadow-sm);
    }
    .comment-user {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 16px;
    }
    .comment-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background-color: #e2e8f0;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      color: var(--primary);
    }
    .user-info h4 {
      font-size: 0.95rem;
      color: var(--dark-gray);
      margin-bottom: 2px;
    }
    .user-info span {
      font-size: 0.75rem;
      color: var(--text-muted);
    }
    .comment-text {
      font-size: 0.9rem;
      color: var(--text-main);
      line-height: 1.5;
    }

    /* Case Showcases (Media list layout) */
    .case-container {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 30px;
    }
    .case-card {
      background: white;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }
    .case-img-box {
      width: 100%;
      aspect-ratio: 16/9;
      overflow: hidden;
      background-color: #f1f5f9;
    }
    .case-img-box img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.3s ease;
    }
    .case-card:hover .case-img-box img {
      transform: scale(1.03);
    }
    .case-info {
      padding: 24px;
    }
    .case-info h4 {
      font-size: 1.2rem;
      color: var(--dark-gray);
      margin-bottom: 8px;
    }
    .case-info p {
      color: var(--text-muted);
      font-size: 0.95rem;
    }

    /* Knowledge base / articles */
    .article-list {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 20px;
    }
    .article-item {
      background: white;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 24px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      height: 100%;
    }
    .article-item h4 {
      font-size: 1.05rem;
      color: var(--dark-gray);
      margin-bottom: 12px;
      line-height: 1.4;
    }
    .article-date {
      font-size: 0.8rem;
      color: var(--text-muted);
      margin-bottom: 16px;
    }

    /* Form Design */
    .form-box {
      max-width: 650px;
      margin: 0 auto;
      background: white;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 40px;
      box-shadow: var(--shadow-md);
    }
    .form-group {
      margin-bottom: 20px;
    }
    .form-label {
      display: block;
      margin-bottom: 6px;
      font-weight: 500;
      color: var(--dark-gray);
      font-size: 0.95rem;
    }
    .form-control {
      width: 100%;
      padding: 10px 14px;
      border: 1px solid var(--border-color);
      border-radius: 6px;
      background-color: var(--bg-base);
      color: var(--text-main);
      outline: none;
      transition: border-color 0.2s ease;
    }
    .form-control:focus {
      border-color: var(--primary);
      background-color: #fff;
    }
    .form-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
    }

    /* Partners & Grid */
    .partner-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
      gap: 15px;
      justify-items: center;
    }
    .partner-item {
      background-color: white;
      border: 1px solid var(--border-color);
      padding: 15px 30px;
      border-radius: 8px;
      text-align: center;
      font-weight: 500;
      color: var(--text-muted);
      width: 100%;
      box-shadow: var(--shadow-sm);
    }

    /* Footer & Links */
    footer {
      background-color: #0f172a;
      color: #94a3b8;
      padding: 60px 0 30px 0;
      font-size: 0.9rem;
      border-top: 1px solid #1e293b;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 40px;
      margin-bottom: 40px;
    }
    .footer-logo {
      height: 38px;
      width: auto;
      margin-bottom: 15px;
      
    }
    .footer-title {
      color: #f8fafc;
      font-weight: 600;
      margin-bottom: 20px;
      font-size: 1rem;
    }
    .footer-links li {
      margin-bottom: 10px;
    }
    .footer-links a {
      color: #94a3b8;
      transition: color 0.2s ease;
    }
    .footer-links a:hover {
      color: #fff;
    }
    .footer-qrcode {
      width: 120px;
      height: 120px;
      background: white;
      padding: 8px;
      border-radius: 6px;
      margin-bottom: 10px;
    }
    .footer-qrcode img {
      width: 100%;
      height: 100%;
    }
    .footer-bottom {
      border-top: 1px solid #1e293b;
      padding-top: 30px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 20px;
    }
    .friend-links {
      display: flex;
      flex-wrap: wrap;
      gap: 15px;
      margin-bottom: 20px;
      padding: 15px 0;
      border-top: 1px solid #1e293b;
      border-bottom: 1px solid #1e293b;
    }
    .friend-links a {
      color: #64748b;
      font-size: 0.85rem;
    }
    .friend-links a:hover {
      color: #cbd5e1;
    }

    /* Fixed floating elements */
    .float-widget {
      position: fixed;
      right: 20px;
      bottom: 20px;
      z-index: 1000;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .widget-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background-color: var(--primary);
      color: white;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 4px 10px rgba(0,0,0,0.15);
      cursor: pointer;
      position: relative;
      transition: background-color 0.2s ease;
    }
    .widget-btn:hover {
      background-color: var(--primary-hover);
    }
    .widget-popover {
      position: absolute;
      right: 60px;
      bottom: 0;
      background: white;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      padding: 15px;
      box-shadow: var(--shadow-lg);
      display: none;
      width: 220px;
      text-align: center;
    }
    .widget-popover img {
      width: 100%;
      height: auto;
      margin-bottom: 10px;
    }
    .widget-popover p {
      font-size: 0.8rem;
      color: var(--text-main);
      margin: 0;
    }

    /* Responsive Mobile CSS */
    @media (max-width: 992px) {
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
      .case-container {
        grid-template-columns: 1fr;
      }
    }
    @media (max-width: 768px) {
      .nav-menu {
        display: none;
        position: absolute;
        top: 70px;
        left: 0;
        right: 0;
        background-color: white;
        flex-direction: column;
        padding: 20px;
        gap: 15px;
        box-shadow: var(--shadow-md);
        border-top: 1px solid var(--border-color);
      }
      .nav-menu.active {
        display: flex;
      }
      .menu-toggle {
        display: block;
      }
      .hero-h1 {
        font-size: 2rem;
      }
      .hero-desc {
        font-size: 1rem;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .form-row {
        grid-template-columns: 1fr;
        gap: 0;
      }
      .section-title {
        font-size: 1.8rem;
      }
    }