:root {
      --rainbow-red: #ff4d4f;
      --rainbow-orange: #ff7a45;
      --rainbow-yellow: #ffec3d;
      --rainbow-green: #52c41a;
      --rainbow-cyan: #13c2c2;
      --rainbow-blue: #1677ff;
      --rainbow-purple: #722ed1;
      --text-main: #1e293b;
      --text-muted: #64748b;
      --bg-light: #f8fafc;
      --card-bg: #ffffff;
      --border-color: #e2e8f0;
      --shadow-sm: 0 4px 6px -1px rgba(0,0,0,0.05), 0 2px 4px -1px rgba(0,0,0,0.03);
      --shadow-md: 0 10px 15px -3px rgba(0,0,0,0.07), 0 4px 6px -2px rgba(0,0,0,0.03);
      --shadow-lg: 0 20px 25px -5px rgba(0,0,0,0.1), 0 10px 10px -5px rgba(0,0,0,0.04);
      --radius: 12px;
    }

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

    html {
      scroll-behavior: smooth;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
      background-color: var(--bg-light);
      color: var(--text-main);
      line-height: 1.6;
    }

    body {
      overflow-x: hidden;
      width: 100%;
    }

    a {
      color: var(--rainbow-blue);
      text-decoration: none;
      transition: all 0.25s ease;
    }

    a:hover {
      color: var(--rainbow-purple);
    }

    .container {
      width: 100%;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }

    /* Top Rainbow Bar */
    .rainbow-line {
      height: 4px;
      width: 100%;
      background: linear-gradient(90deg, var(--rainbow-red), var(--rainbow-orange), var(--rainbow-yellow), var(--rainbow-green), var(--rainbow-cyan), var(--rainbow-blue), var(--rainbow-purple));
    }

    /* Header & Navigation */
    header.site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(10px);
      border-bottom: 1px solid var(--border-color);
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }

    .brand-area {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .ai-page-logo {
      height: 40px;
      width: auto;
      display: block;
    }

    .brand-title {
      font-size: 20px;
      font-weight: 700;
      background: linear-gradient(135deg, var(--rainbow-blue), var(--rainbow-purple));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
      list-style: none;
    }

    .nav-links li a {
      padding: 8px 12px;
      font-size: 14px;
      font-weight: 500;
      color: var(--text-main);
      border-radius: 6px;
      display: inline-block;
    }

    .nav-links li a:hover {
      background: #f1f5f9;
      color: var(--rainbow-blue);
    }

    .nav-cta {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 20px;
      font-size: 14px;
      font-weight: 600;
      border-radius: 30px;
      cursor: pointer;
      border: none;
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
      text-decoration: none;
    }

    .btn-rainbow {
      background: linear-gradient(135deg, var(--rainbow-blue), var(--rainbow-purple));
      color: #ffffff !important;
      box-shadow: 0 4px 14px rgba(22, 119, 255, 0.35);
    }

    .btn-rainbow:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(114, 46, 209, 0.45);
    }

    .btn-outline {
      background: #ffffff;
      color: var(--text-main);
      border: 1px solid var(--border-color);
    }

    .btn-outline:hover {
      border-color: var(--rainbow-blue);
      color: var(--rainbow-blue);
    }

    .menu-toggle {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: none;
      border: none;
      cursor: pointer;
      padding: 5px;
    }

    .menu-toggle span {
      width: 24px;
      height: 2px;
      background-color: var(--text-main);
      transition: 0.3s;
    }

    /* Hero Section (NO IMAGES IN HERO) */
    .hero-section {
      padding: 80px 0 60px;
      background: radial-gradient(circle at 50% 10%, rgba(19, 194, 194, 0.08), rgba(114, 46, 209, 0.05) 50%, transparent 80%);
      text-align: center;
      position: relative;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 16px;
      background: rgba(22, 119, 255, 0.08);
      border: 1px solid rgba(22, 119, 255, 0.2);
      border-radius: 20px;
      font-size: 13px;
      font-weight: 600;
      color: var(--rainbow-blue);
      margin-bottom: 24px;
    }

    .hero-title {
      font-size: 42px;
      font-weight: 800;
      line-height: 1.25;
      margin-bottom: 20px;
      color: var(--text-main);
    }

    .hero-subtitle {
      font-size: 18px;
      color: var(--text-muted);
      max-width: 800px;
      margin: 0 auto 36px;
    }

    .hero-actions {
      display: flex;
      justify-content: center;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 40px;
    }

    .btn-hero-main {
      padding: 14px 32px;
      font-size: 16px;
      background: linear-gradient(90deg, #ff4d4f, #722ed1, #1677ff);
      background-size: 200% auto;
      color: #fff !important;
      border-radius: 30px;
      font-weight: 700;
      box-shadow: 0 8px 24px rgba(114, 46, 209, 0.3);
      animation: rainbowGlow 4s ease infinite;
    }

    @keyframes rainbowGlow {
      0% { background-position: 0% 50%; }
      50% { background-position: 100% 50%; }
      100% { background-position: 0% 50%; }
    }

    .hero-tags-cloud {
      display: flex;
      justify-content: center;
      flex-wrap: wrap;
      gap: 10px;
      max-width: 900px;
      margin: 0 auto;
    }

    .tag-item {
      background: #ffffff;
      padding: 6px 14px;
      border-radius: 20px;
      font-size: 12px;
      color: var(--text-muted);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

    /* Stats Grid */
    .stats-section {
      padding: 40px 0;
      background: #ffffff;
      border-y: 1px solid var(--border-color);
    }

    .stats-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
      gap: 24px;
      text-align: center;
    }

    .stat-card {
      padding: 20px;
      border-radius: var(--radius);
      background: var(--bg-light);
      border: 1px solid var(--border-color);
    }

    .stat-number {
      font-size: 32px;
      font-weight: 800;
      background: linear-gradient(135deg, var(--rainbow-blue), var(--rainbow-cyan));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .stat-label {
      font-size: 14px;
      color: var(--text-muted);
      margin-top: 4px;
    }

    /* Section Component Base */
    .section-padding {
      padding: 80px 0;
    }

    .section-header {
      text-align: center;
      max-width: 700px;
      margin: 0 auto 50px;
    }

    .section-tag {
      font-size: 13px;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 1px;
      color: var(--rainbow-blue);
      margin-bottom: 8px;
      display: block;
    }

    .section-title {
      font-size: 30px;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 12px;
    }

    .section-desc {
      font-size: 15px;
      color: var(--text-muted);
    }

    /* Feature Grid (AIGC Services) */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
      gap: 24px;
    }

    .service-card {
      background: var(--card-bg);
      border-radius: var(--radius);
      padding: 28px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
      position: relative;
      overflow: hidden;
    }

    .service-card::before {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 4px;
      background: linear-gradient(90deg, var(--rainbow-blue), var(--rainbow-purple));
      opacity: 0;
      transition: opacity 0.3s ease;
    }

    .service-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-lg);
    }

    .service-card:hover::before {
      opacity: 1;
    }

    .service-icon {
      width: 48px;
      height: 48px;
      border-radius: 10px;
      background: rgba(22, 119, 255, 0.1);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 22px;
      margin-bottom: 18px;
      color: var(--rainbow-blue);
    }

    .service-title {
      font-size: 18px;
      font-weight: 700;
      margin-bottom: 10px;
    }

    .service-desc {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* Models Pills */
    .models-wrapper {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 30px;
      text-align: center;
    }

    .models-list {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      justify-content: center;
      margin-top: 20px;
    }

    .model-chip {
      background: var(--bg-light);
      border: 1px solid var(--border-color);
      padding: 8px 18px;
      border-radius: 20px;
      font-size: 13px;
      font-weight: 600;
      color: var(--text-main);
      transition: all 0.2s;
    }

    .model-chip:hover {
      border-color: var(--rainbow-purple);
      color: var(--rainbow-purple);
      background: #ffffff;
      transform: scale(1.05);
    }

    /* Process Section */
    .process-steps {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
      gap: 20px;
      position: relative;
    }

    .step-card {
      background: #ffffff;
      padding: 24px;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      text-align: center;
      position: relative;
    }

    .step-num {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--rainbow-cyan), var(--rainbow-blue));
      color: #fff;
      font-weight: 700;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 16px;
    }

    /* Comparison Table Component */
    .comparison-box {
      background: #ffffff;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      overflow: hidden;
      box-shadow: var(--shadow-md);
    }

    .rating-banner {
      background: linear-gradient(135deg, #1e293b, #0f172a);
      color: #ffffff;
      padding: 30px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 20px;
    }

    .rating-score {
      font-size: 40px;
      font-weight: 900;
      color: #ffec3d;
      display: flex;
      align-items: baseline;
      gap: 6px;
    }

    .rating-score span {
      font-size: 16px;
      color: #94a3b8;
    }

    .stars {
      color: #ffec3d;
      font-size: 20px;
      margin-top: 4px;
    }

    .comp-table-wrapper {
      overflow-x: auto;
    }

    .comp-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 600px;
    }

    .comp-table th, .comp-table td {
      padding: 16px 24px;
      border-bottom: 1px solid var(--border-color);
      font-size: 14px;
    }

    .comp-table th {
      background: #f1f5f9;
      font-weight: 700;
    }

    .highlight-col {
      background: rgba(22, 119, 255, 0.03);
      font-weight: 700;
      color: var(--rainbow-blue);
    }

    /* Case Showcases */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 24px;
    }

    .case-card {
      background: #ffffff;
      border-radius: var(--radius);
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

    .case-img-wrap {
      width: 100%;
      height: 200px;
      overflow: hidden;
      background: #e2e8f0;
    }

    .case-img-wrap img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.3s;
    }

    .case-card:hover .case-img-wrap img {
      transform: scale(1.05);
    }

    .case-content {
      padding: 20px;
    }

    .case-title {
      font-size: 16px;
      font-weight: 700;
      margin-bottom: 8px;
    }

    /* Reviews Section */
    .reviews-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
      gap: 24px;
    }

    .review-card {
      background: #ffffff;
      padding: 24px;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

    .review-user {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 14px;
    }

    .avatar-placeholder {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--rainbow-blue), var(--rainbow-purple));
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
    }

    .user-info .name {
      font-weight: 700;
      font-size: 15px;
    }

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

    /* FAQ Section */
    .faq-list {
      max-width: 900px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      overflow: hidden;
    }

    .faq-question {
      padding: 20px 24px;
      font-size: 16px;
      font-weight: 700;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      user-select: none;
    }

    .faq-answer {
      padding: 0 24px 20px;
      font-size: 14px;
      color: var(--text-muted);
      display: none;
      border-top: 1px solid #f1f5f9;
      margin-top: 10px;
      padding-top: 16px;
    }

    .faq-item.active .faq-answer {
      display: block;
    }

    .faq-icon {
      transition: transform 0.3s;
    }

    .faq-item.active .faq-icon {
      transform: rotate(180deg);
    }

    /* Form & Contact Area */
    .contact-wrapper {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      background: #ffffff;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      padding: 40px;
      box-shadow: var(--shadow-md);
    }

    .form-group {
      margin-bottom: 20px;
    }

    .form-group label {
      display: block;
      font-size: 14px;
      font-weight: 600;
      margin-bottom: 6px;
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      font-size: 14px;
      outline: none;
      transition: border 0.2s;
    }

    .form-control:focus {
      border-color: var(--rainbow-blue);
    }

    textarea.form-control {
      min-height: 120px;
      resize: vertical;
    }

    .contact-info-box {
      display: flex;
      flex-direction: column;
      gap: 20px;
    }

    .qr-card {
      display: flex;
      align-items: center;
      gap: 20px;
      background: var(--bg-light);
      padding: 20px;
      border-radius: 8px;
      border: 1px solid var(--border-color);
    }

    .qr-card img {
      width: 100px;
      height: 100px;
      border-radius: 6px;
    }

    /* Articles / AI Encyclopedia */
    .articles-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
      gap: 20px;
    }

    .article-item {
      background: #ffffff;
      padding: 20px;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
    }

    /* Footer */
    footer.site-footer {
      background: #0f172a;
      color: #94a3b8;
      padding: 60px 0 30px;
      font-size: 14px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
      gap: 40px;
      margin-bottom: 40px;
    }

    .footer-col h4 {
      color: #ffffff;
      font-size: 16px;
      margin-bottom: 16px;
    }

    .footer-links {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .footer-links a {
      color: #94a3b8;
    }

    .footer-links a:hover {
      color: #ffffff;
    }

    .friendship-links {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      padding-top: 20px;
      border-top: 1px solid #1e293b;
      margin-top: 20px;
    }

    .friendship-links a {
      color: #64748b;
      font-size: 13px;
    }

    .friendship-links a:hover {
      color: var(--rainbow-cyan);
    }

    .footer-bottom {
      text-align: center;
      padding-top: 30px;
      border-top: 1px solid #1e293b;
      font-size: 13px;
    }

    /* Floating Customer Service */
    .float-kefu {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      background: linear-gradient(135deg, var(--rainbow-blue), var(--rainbow-purple));
      color: #ffffff;
      padding: 12px 20px;
      border-radius: 30px;
      box-shadow: var(--shadow-lg);
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 600;
      cursor: pointer;
    }

    /* Responsive */
    @media (max-width: 992px) {
      .contact-wrapper {
        grid-template-columns: 1fr;
      }
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #ffffff;
        flex-direction: column;
        padding: 20px;
        box-shadow: var(--shadow-md);
        border-bottom: 1px solid var(--border-color);
      }

      .nav-links.active {
        display: flex;
      }

      .menu-toggle {
        display: flex;
      }

      .hero-title {
        font-size: 28px;
      }

      .hero-subtitle {
        font-size: 15px;
      }

      .section-padding {
        padding: 50px 0;
      }
    }