:root {
      --primary-red: #d9232a;
      --deep-red: #a81319;
      --light-red: #fff1f0;
      --accent-gold: #e6a23c;
      --text-main: #1f2329;
      --text-muted: #595f69;
      --border-color: #f0c5c5;
      --bg-page: #fcf8f8;
      --bg-card: #ffffff;
      --shadow-sm: 0 2px 8px rgba(168, 19, 25, 0.06);
      --shadow-md: 0 8px 24px rgba(168, 19, 25, 0.1);
      --shadow-lg: 0 12px 36px rgba(168, 19, 25, 0.15);
      --radius-sm: 6px;
      --radius-md: 10px;
      --radius-lg: 16px;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-page);
      color: var(--text-main);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      width: 100%;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }
    header {
      position: sticky;
      top: 0;
      background: rgba(255, 255, 255, 0.96);
      backdrop-filter: blur(8px);
      z-index: 1000;
      border-bottom: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .brand-logo-wrap {
      display: flex;
      align-items: center;
      gap: 12px;
      text-decoration: none;
    }
    .ai-page-logo {
      height: 42px;
      width: auto;
      object-fit: contain;
    }
    .brand-text {
      font-size: 1.3rem;
      font-weight: 700;
      color: var(--deep-red);
      letter-spacing: 0.5px;
    }
    .nav-links {
      display: flex;
      gap: 0;
      list-style: none;
      align-items: center;
    }
    .nav-links li a {
      color: var(--text-main);
      text-decoration: none;
      font-size: 0.95rem;
      font-weight: 500;
      padding: 8px 12px;
      border-radius: var(--radius-sm);
      transition: all 0.25s ease;
      display: inline-block;
    }
    .nav-links li a:hover {
      color: var(--primary-red);
      background-color: var(--light-red);
    }
    .nav-btn-group {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      font-size: 0.95rem;
      font-weight: 600;
      text-decoration: none;
      border-radius: var(--radius-sm);
      transition: all 0.25s ease;
      cursor: pointer;
      border: 1px solid transparent;
      text-align: center;
    }
    .btn-primary {
      background: linear-gradient(135deg, var(--primary-red), var(--deep-red));
      color: #ffffff;
      box-shadow: 0 4px 12px rgba(217, 35, 42, 0.3);
    }
    .btn-primary:hover {
      background: linear-gradient(135deg, #e52d34, #8c0c11);
      transform: translateY(-2px);
      box-shadow: 0 6px 16px rgba(217, 35, 42, 0.4);
    }
    .btn-secondary {
      background-color: #ffffff;
      color: var(--deep-red);
      border-color: var(--primary-red);
    }
    .btn-secondary:hover {
      background-color: var(--light-red);
      transform: translateY(-2px);
    }
    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      font-size: 1.5rem;
      color: var(--deep-red);
      cursor: pointer;
      padding: 8px;
    }

    /* Hero Section (No Images Allowed) */
    .hero-section {
      background: linear-gradient(180deg, #fff5f5 0%, var(--bg-page) 100%);
      padding: 80px 0 60px;
      text-align: center;
      position: relative;
      overflow: hidden;
      border-bottom: 1px solid var(--border-color);
    }
    .hero-badge {
      display: inline-block;
      padding: 6px 16px;
      background-color: var(--light-red);
      color: var(--deep-red);
      border: 1px solid var(--border-color);
      border-radius: 30px;
      font-size: 0.88rem;
      font-weight: 600;
      margin-bottom: 20px;
      letter-spacing: 0.5px;
    }
    .hero-title {
      font-size: 2.5rem;
      font-weight: 800;
      color: var(--deep-red);
      line-height: 1.3;
      margin-bottom: 18px;
      letter-spacing: 0.5px;
    }
    .hero-subtitle {
      font-size: 1.15rem;
      color: var(--text-muted);
      max-width: 820px;
      margin: 0 auto 32px;
      line-height: 1.7;
    }
    .hero-actions {
      display: flex;
      justify-content: center;
      gap: 16px;
      margin-bottom: 48px;
      flex-wrap: wrap;
    }
    .hero-stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
      max-width: 1040px;
      margin: 0 auto;
    }
    .stat-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      padding: 20px 16px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
    }
    .stat-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: var(--primary-red);
    }
    .stat-value {
      font-size: 1.75rem;
      font-weight: 800;
      color: var(--primary-red);
      line-height: 1.2;
      margin-bottom: 4px;
    }
    .stat-label {
      font-size: 0.88rem;
      color: var(--text-muted);
    }

    /* Common Section */
    section {
      padding: 70px 0;
    }
    .section-header {
      text-align: center;
      margin-bottom: 48px;
    }
    .section-tag {
      font-size: 0.85rem;
      font-weight: 700;
      color: var(--primary-red);
      letter-spacing: 1px;
      text-transform: uppercase;
      margin-bottom: 8px;
    }
    .section-title {
      font-size: 2rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 12px;
    }
    .section-desc {
      font-size: 1rem;
      color: var(--text-muted);
      max-width: 680px;
      margin: 0 auto;
    }

    /* Cards & Grids */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }
    .service-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px 24px;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
      display: flex;
      flex-direction: column;
    }
    .service-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-md);
      border-color: var(--primary-red);
    }
    .service-icon {
      width: 48px;
      height: 48px;
      background: var(--light-red);
      border-radius: var(--radius-sm);
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary-red);
      font-size: 1.4rem;
      font-weight: bold;
      margin-bottom: 16px;
    }
    .service-title {
      font-size: 1.2rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 10px;
    }
    .service-desc {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.6;
      flex-grow: 1;
    }

    /* Media Banners */
    .media-card-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
      margin-top: 30px;
    }
    .media-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }
    .media-card-img-wrap {
      width: 100%;
      overflow: hidden;
      background: #f0f0f0;
    }
    .ai-page-image {
      width: 100%;
      height: auto;
      display: block;
      transition: transform 0.4s ease;
    }
    .media-card:hover .ai-page-image {
      transform: scale(1.03);
    }
    .media-card-body {
      padding: 20px;
    }
    .media-card-title {
      font-size: 1.15rem;
      font-weight: 700;
      margin-bottom: 8px;
      color: var(--text-main);
    }
    .media-card-desc {
      font-size: 0.9rem;
      color: var(--text-muted);
    }

    /* Model Badges Matrix */
    .models-cloud {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-top: 24px;
    }
    .model-chip {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      padding: 8px 16px;
      border-radius: 20px;
      font-size: 0.88rem;
      font-weight: 600;
      color: var(--text-main);
      box-shadow: var(--shadow-sm);
      transition: all 0.2s ease;
    }
    .model-chip:hover {
      border-color: var(--primary-red);
      color: var(--primary-red);
      transform: translateY(-2px);
    }

    /* Process Workflow */
    .process-steps {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      position: relative;
    }
    .step-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px 20px;
      text-align: center;
      box-shadow: var(--shadow-sm);
      position: relative;
    }
    .step-num {
      width: 36px;
      height: 36px;
      line-height: 36px;
      background: var(--primary-red);
      color: #ffffff;
      border-radius: 50%;
      margin: 0 auto 16px;
      font-weight: 700;
      font-size: 1rem;
    }
    .step-title {
      font-size: 1.1rem;
      font-weight: 700;
      margin-bottom: 8px;
    }
    .step-desc {
      font-size: 0.88rem;
      color: var(--text-muted);
    }

    /* Comparison Table */
    .table-container {
      width: 100%;
      overflow-x: auto;
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
      margin-top: 20px;
    }
    .custom-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
    }
    .custom-table th, .custom-table td {
      padding: 16px 20px;
      border-bottom: 1px solid #f0e0e0;
      font-size: 0.92rem;
    }
    .custom-table th {
      background: #fff5f5;
      color: var(--deep-red);
      font-weight: 700;
    }
    .custom-table tr:hover {
      background-color: #fffafa;
    }
    .highlight-col {
      background-color: #fff9f9;
      font-weight: 600;
      color: var(--deep-red);
    }
    .rating-badge {
      display: inline-block;
      padding: 4px 10px;
      background: var(--primary-red);
      color: #fff;
      border-radius: 4px;
      font-weight: bold;
      font-size: 0.85rem;
    }

    /* Testimonials */
    .testimonial-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .testimonial-content {
      font-size: 0.93rem;
      color: var(--text-main);
      margin-bottom: 20px;
      line-height: 1.6;
    }
    .testimonial-user {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid #f5e5e5;
      padding-top: 14px;
    }
    .user-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: var(--light-red);
      color: var(--deep-red);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1.1rem;
    }
    .user-name {
      font-weight: 700;
      font-size: 0.95rem;
      color: var(--text-main);
    }
    .user-role {
      font-size: 0.82rem;
      color: var(--text-muted);
    }

    /* FAQ Accordion */
    .faq-container {
      max-width: 880px;
      margin: 0 auto;
    }
    .faq-item {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      margin-bottom: 12px;
      overflow: hidden;
      transition: all 0.25s ease;
    }
    .faq-question {
      padding: 18px 24px;
      font-weight: 600;
      font-size: 1rem;
      color: var(--text-main);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      background: #ffffff;
      user-select: none;
    }
    .faq-question:hover {
      color: var(--primary-red);
    }
    .faq-toggle-icon {
      font-size: 1.2rem;
      color: var(--primary-red);
      transition: transform 0.3s ease;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease, padding 0.35s ease;
      background: #fffcfc;
      color: var(--text-muted);
      font-size: 0.92rem;
      line-height: 1.7;
      padding: 0 24px;
    }
    .faq-item.active .faq-answer {
      max-height: 300px;
      padding: 16px 24px 20px;
      border-top: 1px solid #f8e8e8;
    }
    .faq-item.active .faq-toggle-icon {
      transform: rotate(45deg);
    }

    /* Contact & Form Section */
    .form-contact-wrap {
      display: grid;
      grid-template-columns: 1.2fr 0.8fr;
      gap: 36px;
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 40px;
      box-shadow: var(--shadow-sm);
    }
    .form-group {
      margin-bottom: 18px;
    }
    .form-label {
      display: block;
      font-size: 0.9rem;
      font-weight: 600;
      margin-bottom: 6px;
      color: var(--text-main);
    }
    .form-control {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid #dcdfe6;
      border-radius: var(--radius-sm);
      font-size: 0.95rem;
      transition: border-color 0.25s ease;
      background: #fff;
    }
    .form-control:focus {
      outline: none;
      border-color: var(--primary-red);
      box-shadow: 0 0 0 3px rgba(217, 35, 42, 0.1);
    }
    textarea.form-control {
      resize: vertical;
      min-height: 100px;
    }
    .contact-info-panel {
      background: #fff9f9;
      border: 1px solid #fcdada;
      border-radius: var(--radius-md);
      padding: 28px;
      display: flex;
      flex-direction: column;
      gap: 20px;
    }
    .info-item-title {
      font-weight: 700;
      font-size: 0.95rem;
      color: var(--deep-red);
      margin-bottom: 4px;
    }
    .info-item-value {
      font-size: 0.92rem;
      color: var(--text-muted);
    }
    .qr-container {
      margin-top: 10px;
      text-align: center;
      background: #fff;
      padding: 14px;
      border-radius: var(--radius-sm);
      border: 1px solid #f0d0d0;
      display: inline-block;
    }
    .qr-container img {
      width: 140px;
      height: 140px;
      display: block;
      margin: 0 auto;
      object-fit: contain;
    }
    .qr-label {
      font-size: 0.82rem;
      color: var(--text-muted);
      margin-top: 6px;
    }

    /* Articles & Links */
    .article-list {
      list-style: none;
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 16px;
    }
    .article-item a {
      display: block;
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      padding: 16px 20px;
      border-radius: var(--radius-sm);
      text-decoration: none;
      color: var(--text-main);
      font-weight: 500;
      transition: all 0.25s ease;
    }
    .article-item a:hover {
      color: var(--primary-red);
      border-color: var(--primary-red);
      background-color: var(--light-red);
      transform: translateX(4px);
    }

    /* Footer */
    footer {
      background: #1a1717;
      color: #d1d5db;
      padding: 60px 0 30px;
      border-top: 4px solid var(--primary-red);
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
      gap: 32px;
      margin-bottom: 40px;
    }
    .footer-col-title {
      font-size: 1.05rem;
      font-weight: 700;
      color: #ffffff;
      margin-bottom: 18px;
    }
    .footer-links {
      list-style: none;
    }
    .footer-links li {
      margin-bottom: 10px;
    }
    .footer-links a {
      color: #9ca3af;
      text-decoration: none;
      font-size: 0.9rem;
      transition: color 0.2s ease;
    }
    .footer-links a:hover {
      color: #ffffff;
    }
    .footer-friend-links {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
    }
    .footer-friend-links a {
      color: #9ca3af;
      text-decoration: none;
      font-size: 0.88rem;
      background: #282424;
      padding: 4px 10px;
      border-radius: 4px;
      transition: all 0.2s ease;
    }
    .footer-friend-links a:hover {
      color: #ffffff;
      background: var(--primary-red);
    }
    .footer-bottom {
      border-top: 1px solid #332e2e;
      padding-top: 24px;
      text-align: center;
      font-size: 0.85rem;
      color: #6b7280;
    }

    /* Floating Customer Service */
    .float-service {
      position: fixed;
      right: 20px;
      bottom: 40px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }
    .float-btn {
      width: 50px;
      height: 50px;
      border-radius: 50%;
      background: var(--primary-red);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 4px 16px rgba(217, 35, 42, 0.4);
      text-decoration: none;
      font-size: 1.2rem;
      cursor: pointer;
      transition: transform 0.25s ease;
      border: none;
    }
    .float-btn:hover {
      transform: scale(1.1);
      background: var(--deep-red);
    }

    /* Responsive */
    @media (max-width: 992px) {
      .grid-3, .grid-4, .hero-stats-grid, .process-steps {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .form-contact-wrap {
        grid-template-columns: 1fr;
      }
    }
    @media (max-width: 768px) {
      .mobile-menu-btn {
        display: block;
      }
      .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;
      }
      .nav-links li {
        width: 100%;
        text-align: center;
      }
      .nav-btn-group {
        display: none;
      }
      .hero-title {
        font-size: 1.8rem;
      }
      .grid-2, .media-card-grid, .article-list, .grid-3, .grid-4, .hero-stats-grid, .process-steps {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .form-contact-wrap {
        padding: 24px;
      }
    }