:root {
      --primary: #4f46e5;
      --primary-hover: #4338ca;
      --text-main: #1f2937;
      --text-muted: #4b5563;
      --text-light: #6b7280;
      --bg-page: #fafbfc;
      --bg-card: #ffffff;
      --border-color: #e5e7eb;
      --accent-rainbow: linear-gradient(135deg, #ff5e62 0%, #ff9966 20%, #f9d423 40%, #00b09b 60%, #96c93d 80%, #7f00ff 100%);
      --container-max: 1200px;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
      -webkit-tap-highlight-color: transparent;
    }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
      color: var(--text-main);
      background-color: var(--bg-page);
      line-height: 1.6;
      font-size: 16px;
      overflow-x: hidden;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    .site-rainbow-bar {
      height: 4px;
      background: var(--accent-rainbow);
      width: 100%;
    }
    .container {
      width: 100%;
      max-width: var(--container-max);
      margin-left: auto;
      margin-right: auto;
      padding-left: 20px;
      padding-right: 20px;
    }
    .header-nav {
      position: sticky;
      top: 0;
      background: rgba(255, 255, 255, 0.96);
      backdrop-filter: blur(8px);
      border-bottom: 1px solid var(--border-color);
      z-index: 1000;
    }
    .nav-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .brand-box {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .brand-box img.ai-page-logo {
      height: 40px;
      width: auto;
      display: block;
    }
    .brand-title {
      font-size: 1.25rem;
      font-weight: 700;
      color: #111827;
      letter-spacing: -0.5px;
    }
    .nav-links {
      display: flex;
      align-items: center;
      list-style: none;
      gap: 0;
    }
    .nav-links li a {
      font-size: 0.95rem;
      color: var(--text-muted);
      font-weight: 500;
      padding: 8px 14px;
      border-radius: 6px;
      transition: all 0.2s ease;
      display: inline-block;
    }
    .nav-links li a:hover,
    .nav-links li a.active {
      color: var(--primary);
      background: #f3f4f6;
    }
    .nav-actions {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 20px;
      font-size: 0.95rem;
      font-weight: 600;
      border-radius: 8px;
      cursor: pointer;
      transition: all 0.2s ease;
      border: 1px solid transparent;
      text-align: center;
    }
    .btn-primary {
      background: #2563eb;
      color: #ffffff;
      box-shadow: 0 4px 12px rgba(37, 99, 235, 0.2);
    }
    .btn-primary:hover {
      background: #1d4ed8;
      box-shadow: 0 6px 16px rgba(37, 99, 235, 0.3);
      transform: translateY(-1px);
    }
    .btn-rainbow {
      background: linear-gradient(135deg, #4f46e5, #06b6d4);
      color: #ffffff;
      box-shadow: 0 4px 14px rgba(79, 70, 229, 0.25);
    }
    .btn-rainbow:hover {
      opacity: 0.95;
      transform: translateY(-1px);
    }
    .btn-outline {
      border-color: var(--border-color);
      color: var(--text-muted);
      background: #ffffff;
    }
    .btn-outline:hover {
      border-color: #9ca3af;
      background: #f9fafb;
    }
    .mobile-menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.5rem;
      color: var(--text-main);
      cursor: pointer;
      padding: 6px;
    }

    .hero-section {
      padding: 72px 0 60px;
      background: radial-gradient(circle at 50% 0%, #eff6ff 0%, #fafbfc 70%);
      border-bottom: 1px solid var(--border-color);
    }
    .hero-content {
      text-align: center;
      max-width: 860px;
      margin: 0 auto;
    }
    .badge-pill {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 6px 16px;
      background: #ffffff;
      border: 1px solid #e0e7ff;
      border-radius: 9999px;
      font-size: 0.85rem;
      font-weight: 600;
      color: #4338ca;
      margin-bottom: 20px;
      box-shadow: 0 2px 6px rgba(99, 102, 241, 0.08);
    }
    .badge-pill span {
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: #10b981;
    }
    .hero-title {
      font-size: 2.8rem;
      font-weight: 800;
      line-height: 1.25;
      color: #111827;
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }
    .hero-subtitle {
      font-size: 1.2rem;
      color: var(--text-muted);
      margin-bottom: 32px;
      line-height: 1.6;
    }
    .hero-actions {
      display: flex;
      justify-content: center;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 40px;
    }
    .hero-stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
      margin-top: 40px;
    }
    .stat-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 12px;
      padding: 20px 16px;
      text-align: center;
      box-shadow: 0 2px 4px rgba(0,0,0,0.02);
      border-top: 3px solid transparent;
      border-image: var(--accent-rainbow) 1;
    }
    .stat-card .val {
      font-size: 1.75rem;
      font-weight: 700;
      color: #111827;
      margin-bottom: 4px;
    }
    .stat-card .label {
      font-size: 0.85rem;
      color: var(--text-light);
    }

    section {
      padding: 64px 0;
      border-bottom: 1px solid #f3f4f6;
    }
    .section-header {
      text-align: center;
      max-width: 680px;
      margin: 0 auto 48px;
    }
    .section-tag {
      font-size: 0.85rem;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 1px;
      color: var(--primary);
      margin-bottom: 8px;
      display: block;
    }
    .section-title {
      font-size: 2rem;
      font-weight: 700;
      color: #111827;
      margin-bottom: 12px;
    }
    .section-desc {
      font-size: 1rem;
      color: var(--text-muted);
    }

    .about-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
    }
    .about-text p {
      margin-bottom: 16px;
      color: var(--text-muted);
      font-size: 1rem;
      line-height: 1.7;
    }
    .about-features-list {
      list-style: none;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 12px;
      margin-top: 24px;
    }
    .about-features-list li {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 0.9rem;
      color: var(--text-main);
      font-weight: 500;
    }
    .about-features-list li::before {
      content: "✓";
      color: #10b981;
      font-weight: bold;
    }
    .about-media-box {
      border-radius: 12px;
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: 0 8px 24px rgba(0,0,0,0.04);
      background: #fff;
    }
    .about-media-box img {
      width: 100%;
      height: auto;
      display: block;
    }

    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .service-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 12px;
      padding: 24px;
      transition: all 0.25s ease;
      position: relative;
      overflow: hidden;
    }
    .service-card:hover {
      transform: translateY(-4px);
      box-shadow: 0 12px 24px rgba(0,0,0,0.06);
      border-color: #cbd5e1;
    }
    .service-card::before {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      height: 3px;
      background: var(--accent-rainbow);
      opacity: 0.8;
    }
    .service-icon {
      font-size: 1.8rem;
      margin-bottom: 16px;
      display: inline-block;
    }
    .service-card h3 {
      font-size: 1.2rem;
      font-weight: 600;
      color: #111827;
      margin-bottom: 10px;
    }
    .service-card p {
      font-size: 0.9rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    .scenes-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .scene-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 10px;
      padding: 20px;
      transition: all 0.2s ease;
    }
    .scene-item:hover {
      border-color: #93c5fd;
      background: #f8fafc;
    }
    .scene-item h4 {
      font-size: 1rem;
      font-weight: 600;
      color: #1e293b;
      margin-bottom: 8px;
    }
    .scene-item p {
      font-size: 0.85rem;
      color: var(--text-muted);
      line-height: 1.5;
    }

    .models-tags-wrap {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-top: 24px;
    }
    .model-tag {
      padding: 6px 14px;
      background: #ffffff;
      border: 1px solid #e2e8f0;
      border-radius: 20px;
      font-size: 0.85rem;
      color: #334155;
      font-weight: 500;
      box-shadow: 0 1px 3px rgba(0,0,0,0.02);
      transition: all 0.2s ease;
    }
    .model-tag:hover {
      border-color: #3b82f6;
      color: #2563eb;
      transform: translateY(-1px);
    }

    .process-timeline {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      position: relative;
    }
    .process-step {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 12px;
      padding: 24px 20px;
      text-align: center;
    }
    .step-number {
      width: 40px;
      height: 40px;
      margin: 0 auto 16px;
      border-radius: 50%;
      background: #eff6ff;
      color: #2563eb;
      font-weight: 700;
      display: flex;
      align-items: center;
      justify-content: center;
      border: 2px solid #bfdbfe;
    }
    .process-step h3 {
      font-size: 1.1rem;
      margin-bottom: 8px;
    }
    .process-step p {
      font-size: 0.85rem;
      color: var(--text-muted);
    }

    .cases-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .case-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 12px;
      overflow: hidden;
      display: flex;
      flex-direction: column;
    }
    .case-card-body {
      padding: 20px;
      flex-grow: 1;
    }
    .case-card-body h3 {
      font-size: 1.1rem;
      margin-bottom: 8px;
    }
    .case-card-body p {
      font-size: 0.85rem;
      color: var(--text-muted);
      margin-bottom: 12px;
    }
    .case-badge {
      display: inline-block;
      padding: 4px 8px;
      border-radius: 4px;
      background: #f1f5f9;
      font-size: 0.75rem;
      color: #475569;
      margin-bottom: 8px;
    }

    .rating-banner {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 12px;
      padding: 24px 32px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: 32px;
      border-left: 6px solid #f59e0b;
    }
    .rating-score-box {
      display: flex;
      align-items: baseline;
      gap: 8px;
    }
    .rating-number {
      font-size: 2.8rem;
      font-weight: 800;
      color: #d97706;
    }
    .rating-max {
      font-size: 1.1rem;
      color: var(--text-light);
    }
    .rating-stars {
      color: #f59e0b;
      font-size: 1.25rem;
      letter-spacing: 2px;
    }
    .compare-table-wrap {
      overflow-x: auto;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 12px;
    }
    .compare-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 600px;
    }
    .compare-table th, .compare-table td {
      padding: 16px 20px;
      border-bottom: 1px solid #f1f5f9;
      font-size: 0.95rem;
    }
    .compare-table th {
      background: #f8fafc;
      font-weight: 600;
      color: #334155;
    }
    .compare-table tr:last-child td {
      border-bottom: none;
    }
    .highlight-col {
      background: #eff6ff;
      color: #1e40af;
      font-weight: 600;
    }

    .price-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .price-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 12px;
      padding: 32px 24px;
      text-align: center;
      position: relative;
    }
    .price-card.featured {
      border: 2px solid #3b82f6;
      box-shadow: 0 10px 25px rgba(59, 130, 246, 0.1);
    }
    .price-tag-badge {
      position: absolute;
      top: -12px;
      left: 50%;
      transform: translateX(-50%);
      background: #2563eb;
      color: #fff;
      font-size: 0.75rem;
      padding: 2px 12px;
      border-radius: 12px;
      font-weight: 600;
    }
    .price-val {
      font-size: 2.2rem;
      font-weight: 700;
      color: #111827;
      margin: 16px 0;
    }
    .price-features {
      list-style: none;
      text-align: left;
      margin: 24px 0;
      font-size: 0.9rem;
      color: var(--text-muted);
    }
    .price-features li {
      margin-bottom: 10px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .price-features li::before {
      content: "•";
      color: #2563eb;
      font-size: 1.2rem;
    }

    .reviews-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }
    .review-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 12px;
      padding: 24px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .review-text {
      font-size: 0.9rem;
      color: #374151;
      line-height: 1.6;
      margin-bottom: 16px;
    }
    .review-author {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid #f1f5f9;
      padding-top: 12px;
    }
    .review-avatar {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      background: #e2e8f0;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: bold;
      color: #475569;
    }
    .author-info .name {
      font-size: 0.9rem;
      font-weight: 600;
      color: #111827;
    }
    .author-info .role {
      font-size: 0.8rem;
      color: var(--text-light);
    }

    .faq-accordion {
      max-width: 860px;
      margin: 0 auto;
    }
    .faq-item {
      border: 1px solid var(--border-color);
      border-radius: 8px;
      margin-bottom: 12px;
      background: #ffffff;
      overflow: hidden;
    }
    .faq-question {
      padding: 18px 24px;
      font-size: 1rem;
      font-weight: 600;
      color: #1f2937;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      user-select: none;
    }
    .faq-question:hover {
      background: #f9fafb;
    }
    .faq-icon {
      font-size: 1.2rem;
      color: #9ca3af;
      transition: transform 0.2s ease;
    }
    .faq-answer {
      padding: 0 24px;
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      color: var(--text-muted);
      font-size: 0.92rem;
      line-height: 1.6;
      background: #fafbfc;
    }
    .faq-item.active .faq-answer {
      padding: 16px 24px 20px;
      max-height: 240px;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
      color: #2563eb;
    }

    .form-contact-container {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: start;
    }
    .contact-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 12px;
      padding: 32px;
    }
    .contact-item {
      margin-bottom: 20px;
    }
    .contact-item h4 {
      font-size: 0.95rem;
      color: var(--text-light);
      margin-bottom: 4px;
    }
    .contact-item p, .contact-item a {
      font-size: 1.05rem;
      color: #111827;
      font-weight: 600;
    }
    .qr-group {
      display: flex;
      gap: 20px;
      margin-top: 24px;
      align-items: center;
    }
    .qr-box {
      text-align: center;
    }
    .qr-box img {
      width: 120px;
      height: 120px;
      border-radius: 8px;
      border: 1px solid var(--border-color);
      padding: 4px;
      background: #fff;
    }
    .qr-box span {
      display: block;
      font-size: 0.8rem;
      color: var(--text-light);
      margin-top: 6px;
    }
    .form-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 12px;
      padding: 32px;
      box-shadow: 0 4px 12px rgba(0,0,0,0.02);
    }
    .form-group {
      margin-bottom: 16px;
    }
    .form-label {
      display: block;
      font-size: 0.88rem;
      font-weight: 500;
      color: #374151;
      margin-bottom: 6px;
    }
    .form-control {
      width: 100%;
      padding: 10px 14px;
      border: 1px solid var(--border-color);
      border-radius: 6px;
      font-size: 0.95rem;
      color: #1f2937;
      background: #ffffff;
      transition: border-color 0.2s ease;
    }
    .form-control:focus {
      outline: none;
      border-color: #3b82f6;
      box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
    }
    textarea.form-control {
      min-height: 100px;
      resize: vertical;
    }

    .articles-list {
      display: flex;
      flex-direction: column;
      gap: 12px;
      margin-top: 16px;
    }
    .article-item-link {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 14px 20px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      color: #374151;
      font-size: 0.95rem;
      transition: all 0.2s ease;
    }
    .article-item-link:hover {
      border-color: #93c5fd;
      background: #f8fafc;
      color: #2563eb;
    }

    .friend-links-box {
      padding: 20px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      align-items: center;
    }
    .friend-links-box a {
      font-size: 0.88rem;
      color: var(--text-muted);
      transition: color 0.2s;
    }
    .friend-links-box a:hover {
      color: #2563eb;
      text-decoration: underline;
    }

    footer {
      background: #f8fafc;
      border-top: 1px solid var(--border-color);
      padding: 48px 0 24px;
      color: var(--text-muted);
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 40px;
      margin-bottom: 32px;
    }
    .footer-col h4 {
      font-size: 1rem;
      color: #111827;
      margin-bottom: 16px;
      font-weight: 600;
    }
    .footer-links {
      list-style: none;
    }
    .footer-links li {
      margin-bottom: 8px;
    }
    .footer-links a {
      font-size: 0.88rem;
      color: var(--text-muted);
    }
    .footer-links a:hover {
      color: #2563eb;
    }
    .footer-bottom {
      border-top: 1px solid #e2e8f0;
      padding-top: 20px;
      text-align: center;
      font-size: 0.85rem;
      color: var(--text-light);
    }

    .float-kefu-bar {
      position: fixed;
      right: 20px;
      bottom: 40px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .float-btn {
      width: 48px;
      height: 48px;
      background: #2563eb;
      color: #fff;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 4px 12px rgba(0,0,0,0.15);
      cursor: pointer;
      position: relative;
      border: none;
      transition: transform 0.2s;
    }
    .float-btn:hover {
      transform: scale(1.05);
    }
    .float-popover {
      position: absolute;
      right: 60px;
      bottom: 0;
      background: #ffffff;
      padding: 12px;
      border-radius: 8px;
      box-shadow: 0 8px 24px rgba(0,0,0,0.15);
      border: 1px solid var(--border-color);
      display: none;
      width: 140px;
      text-align: center;
    }
    .float-popover img {
      width: 100%;
      height: auto;
      border-radius: 4px;
    }
    .float-popover p {
      font-size: 0.75rem;
      color: #4b5563;
      margin-top: 6px;
    }
    .float-btn:hover .float-popover {
      display: block;
    }
    .back-top {
      background: #4b5563;
      display: none;
    }

    @media (max-width: 992px) {
      .services-grid, .cases-grid, .reviews-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .scenes-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .process-timeline {
        grid-template-columns: repeat(2, 1fr);
      }
      .hero-stats-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .about-grid, .form-contact-container, .footer-grid {
        grid-template-columns: 1fr;
      }
    }
    @media (max-width: 768px) {
      .hero-title {
        font-size: 2rem;
      }
      .mobile-menu-toggle {
        display: block;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #ffffff;
        flex-direction: column;
        padding: 16px 20px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: 0 4px 12px rgba(0,0,0,0.05);
      }
      .nav-links.active {
        display: flex;
      }
      .nav-links li {
        width: 100%;
      }
      .nav-links li a {
        display: block;
        padding: 10px 0;
        border-bottom: 1px solid #f3f4f6;
      }
      .services-grid, .cases-grid, .reviews-grid, .price-grid, .scenes-grid, .process-timeline {
        grid-template-columns: 1fr;
      }
      .hero-stats-grid {
        grid-template-columns: 1fr;
      }
      .rating-banner {
        flex-direction: column;
        align-items: flex-start;
        gap: 16px;
      }
    }