:root {
      --primary: #059669;
      --primary-light: #10b981;
      --primary-mint: #34d399;
      --primary-soft: #ecfdf5;
      --primary-dark: #064e3b;
      --bg-mint-gradient: linear-gradient(180deg, #f0fdf4 0%, #ffffff 100%);
      --bg-card: #ffffff;
      --text-main: #0f172a;
      --text-regular: #334155;
      --text-muted: #64748b;
      --border-color: #e2e8f0;
      --border-light: #d1fae5;
      --shadow-sm: 0 2px 8px rgba(5, 150, 105, 0.04);
      --shadow-md: 0 8px 24px rgba(5, 150, 105, 0.08);
      --shadow-lg: 0 16px 36px rgba(5, 150, 105, 0.12);
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --container-width: 1200px;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
      -webkit-font-smoothing: antialiased;
    }
    html {
      scroll-behavior: smooth;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: #f8fafc;
      color: var(--text-main);
      line-height: 1.6;
    }
    body {
      background: var(--bg-mint-gradient);
      min-height: 100vh;
      overflow-x: hidden;
    }
    .ai-container {
      max-width: var(--container-width);
      margin: 0 auto;
      padding: 0 24px;
      width: 100%;
    }
    a {
      color: var(--primary);
      text-decoration: none;
      transition: all 0.25s ease;
    }
    a:hover {
      color: var(--primary-light);
    }
    /* Header & Navigation */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-light);
      box-shadow: var(--shadow-sm);
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .brand-wrap {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .brand-wrap .ai-page-logo {
      height: 40px;
      width: auto;
      object-fit: contain;
    }
    .brand-title {
      font-size: 20px;
      font-weight: 700;
      color: var(--primary-dark);
      letter-spacing: -0.5px;
    }
    .nav-links {
      display: flex;
      align-items: center;
      list-style: none;
      gap: 0;
    }
    .nav-links li a {
      display: block;
      padding: 8px 12px;
      font-size: 14px;
      font-weight: 500;
      color: var(--text-regular);
      border-radius: var(--radius-sm);
      transition: all 0.2s ease;
    }
    .nav-links li a:hover,
    .nav-links li a.active {
      color: var(--primary);
      background: var(--primary-soft);
    }
    .header-actions {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .btn-nav-primary {
      padding: 8px 18px;
      background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
      color: #ffffff !important;
      font-size: 14px;
      font-weight: 600;
      border-radius: 30px;
      box-shadow: 0 4px 12px rgba(5, 150, 105, 0.2);
    }
    .btn-nav-primary:hover {
      transform: translateY(-1px);
      box-shadow: 0 6px 16px rgba(5, 150, 105, 0.3);
    }
    .mobile-menu-toggle {
      display: none;
      background: none;
      border: none;
      cursor: pointer;
      padding: 6px;
      color: var(--text-main);
    }
    /* Section Common Styles */
    section {
      padding: 80px 0;
      position: relative;
    }
    .section-header {
      text-align: center;
      max-width: 720px;
      margin: 0 auto 50px auto;
    }
    .section-tag {
      display: inline-block;
      padding: 4px 14px;
      background: var(--primary-soft);
      border: 1px solid var(--border-light);
      color: var(--primary);
      font-size: 13px;
      font-weight: 600;
      border-radius: 20px;
      margin-bottom: 12px;
      letter-spacing: 0.5px;
    }
    .section-title {
      font-size: 32px;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 16px;
      line-height: 1.3;
    }
    .section-desc {
      font-size: 16px;
      color: var(--text-muted);
      line-height: 1.7;
    }
    /* Hero Section (No Images as per requirement) */
    .hero-section {
      padding: 90px 0 70px 0;
      background: radial-gradient(circle at 50% 20%, rgba(209, 250, 229, 0.6) 0%, rgba(255, 255, 255, 0) 70%);
      text-align: center;
      position: relative;
    }
    .hero-badge-pill {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: #ffffff;
      border: 1px solid var(--border-light);
      padding: 6px 18px;
      border-radius: 30px;
      font-size: 14px;
      font-weight: 600;
      color: var(--primary-dark);
      box-shadow: var(--shadow-sm);
      margin-bottom: 24px;
      animation: floatBadge 3s ease-in-out infinite;
    }
    @keyframes floatBadge {
      0%, 100% { transform: translateY(0); }
      50% { transform: translateY(-4px); }
    }
    .hero-badge-dot {
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: var(--primary-light);
      box-shadow: 0 0 0 4px rgba(16, 185, 129, 0.2);
    }
    .hero-title {
      font-size: 44px;
      font-weight: 900;
      color: var(--primary-dark);
      letter-spacing: -0.5px;
      line-height: 1.25;
      margin-bottom: 20px;
    }
    .hero-subtitle {
      font-size: 18px;
      color: var(--text-regular);
      max-width: 840px;
      margin: 0 auto 36px auto;
      line-height: 1.8;
    }
    .hero-cta-group {
      display: flex;
      justify-content: center;
      align-items: center;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 48px;
    }
    .btn-main-official {
      padding: 14px 34px;
      background: linear-gradient(135deg, var(--primary) 0%, #047857 100%);
      color: #ffffff !important;
      font-size: 16px;
      font-weight: 700;
      border-radius: 40px;
      box-shadow: 0 10px 24px rgba(5, 150, 105, 0.25);
      transition: all 0.3s ease;
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }
    .btn-main-official:hover {
      transform: translateY(-2px);
      box-shadow: 0 14px 30px rgba(5, 150, 105, 0.35);
      background: linear-gradient(135deg, #047857 0%, #065f46 100%);
    }
    .btn-outline-soft {
      padding: 14px 30px;
      background: #ffffff;
      color: var(--text-main);
      border: 1px solid var(--border-color);
      font-size: 16px;
      font-weight: 600;
      border-radius: 40px;
      box-shadow: var(--shadow-sm);
      transition: all 0.25s ease;
    }
    .btn-outline-soft:hover {
      border-color: var(--primary-light);
      color: var(--primary);
      background: var(--primary-soft);
    }
    /* Hero Pure-CSS Tech Grid Card */
    .hero-tech-card {
      background: #ffffff;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-lg);
      padding: 30px;
      box-shadow: var(--shadow-md);
      max-width: 960px;
      margin: 0 auto;
    }
    .hero-stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      border-bottom: 1px solid var(--border-light);
      padding-bottom: 24px;
      margin-bottom: 24px;
    }
    .stat-item {
      text-align: center;
    }
    .stat-num {
      font-size: 32px;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 4px;
    }
    .stat-label {
      font-size: 14px;
      color: var(--text-muted);
    }
    .hero-tags-stream {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 8px;
    }
    .model-badge {
      background: var(--primary-soft);
      border: 1px solid var(--border-light);
      color: var(--primary-dark);
      padding: 5px 12px;
      border-radius: 14px;
      font-size: 12px;
      font-weight: 600;
    }
    /* Cards & Grids */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }
    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .feature-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
      display: flex;
      flex-direction: column;
      height: 100%;
    }
    .feature-card:hover {
      border-color: var(--primary-light);
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }
    .card-icon {
      width: 48px;
      height: 48px;
      background: var(--primary-soft);
      color: var(--primary);
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 22px;
      margin-bottom: 18px;
      border: 1px solid var(--border-light);
    }
    .feature-card h3 {
      font-size: 18px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 10px;
    }
    .feature-card p {
      font-size: 14px;
      color: var(--text-regular);
      line-height: 1.7;
      margin-bottom: 16px;
      flex-grow: 1;
    }
    .card-tag-row {
      display: flex;
      flex-wrap: wrap;
      gap: 6px;
    }
    .pill-tag {
      font-size: 12px;
      padding: 3px 8px;
      background: #f1f5f9;
      color: var(--text-muted);
      border-radius: 6px;
    }
    /* Media Showcase Section */
    .media-card {
      background: #ffffff;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }
    .media-card .img-container {
      width: 100%;
      aspect-ratio: 16 / 9;
      background: #f1f5f9;
      display: flex;
      align-items: center;
      justify-content: center;
      overflow: hidden;
    }
    .media-card .img-container.square {
      aspect-ratio: 1 / 1;
    }
    .media-card img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.4s ease;
    }
    .media-card:hover img {
      transform: scale(1.03);
    }
    .media-content {
      padding: 20px;
    }
    .media-content h4 {
      font-size: 16px;
      font-weight: 700;
      margin-bottom: 6px;
      color: var(--text-main);
    }
    .media-content p {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.6;
    }
    /* Banner Showcases */
    .banner-gallery {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
      margin-top: 30px;
    }
    .banner-box {
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border-light);
      box-shadow: var(--shadow-sm);
      background: #ffffff;
    }
    .banner-box img {
      width: 100%;
      height: 200px;
      object-fit: cover;
      display: block;
    }
    /* Comparison Matrix & Rating */
    .rating-header-card {
      background: linear-gradient(135deg, #ecfdf5 0%, #f0fdf4 100%);
      border: 2px solid var(--border-light);
      border-radius: var(--radius-lg);
      padding: 36px;
      margin-bottom: 40px;
      text-align: center;
    }
    .score-badge-huge {
      font-size: 56px;
      font-weight: 900;
      color: var(--primary);
      line-height: 1;
      margin-bottom: 10px;
    }
    .score-stars {
      color: #f59e0b;
      font-size: 24px;
      margin-bottom: 12px;
      letter-spacing: 4px;
    }
    .table-container {
      width: 100%;
      overflow-x: auto;
      background: #ffffff;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }
    .compare-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 650px;
    }
    .compare-table th,
    .compare-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
      font-size: 14px;
    }
    .compare-table th {
      background: #f8fafc;
      color: var(--text-main);
      font-weight: 700;
    }
    .compare-table tr:last-child td {
      border-bottom: none;
    }
    .highlight-col {
      background: #f0fdf4;
      font-weight: 600;
      color: var(--primary-dark);
    }
    /* Process Steps */
    .process-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      position: relative;
    }
    .step-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      text-align: center;
      position: relative;
    }
    .step-badge {
      width: 36px;
      height: 36px;
      background: var(--primary);
      color: #ffffff;
      border-radius: 50%;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 16px;
      margin-bottom: 14px;
    }
    .step-title {
      font-size: 16px;
      font-weight: 700;
      margin-bottom: 8px;
    }
    .step-desc {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.6;
    }
    /* Testimonials */
    .review-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .review-card {
      background: #ffffff;
      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;
    }
    .review-text {
      font-size: 14px;
      color: var(--text-regular);
      line-height: 1.8;
      margin-bottom: 20px;
      font-style: italic;
    }
    .review-author {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid #f1f5f9;
      padding-top: 14px;
    }
    .author-avatar-badge {
      width: 42px;
      height: 42px;
      background: var(--primary-soft);
      color: var(--primary);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 14px;
    }
    .author-name {
      font-size: 15px;
      font-weight: 700;
      color: var(--text-main);
    }
    .author-role {
      font-size: 12px;
      color: var(--text-muted);
    }
    /* FAQ Accordion */
    .faq-list {
      max-width: 860px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }
    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      overflow: hidden;
      transition: all 0.25s ease;
    }
    .faq-item.active {
      border-color: var(--primary-light);
      box-shadow: var(--shadow-sm);
    }
    .faq-question {
      padding: 18px 24px;
      font-size: 16px;
      font-weight: 700;
      color: var(--text-main);
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: space-between;
      user-select: none;
    }
    .faq-question:hover {
      color: var(--primary);
    }
    .faq-icon {
      font-size: 18px;
      color: var(--primary);
      transition: transform 0.3s ease;
    }
    .faq-item.active .faq-icon {
      transform: rotate(180deg);
    }
    .faq-answer {
      padding: 0 24px;
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease, padding 0.35s ease;
      color: var(--text-regular);
      font-size: 14px;
      line-height: 1.8;
      border-top: 1px solid transparent;
    }
    .faq-item.active .faq-answer {
      padding: 0 24px 20px 24px;
      max-height: 300px;
      border-top-color: #f1f5f9;
    }
    /* Form Section */
    .form-wrap {
      background: #ffffff;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-lg);
      padding: 40px;
      box-shadow: var(--shadow-md);
      max-width: 800px;
      margin: 0 auto;
    }
    .form-row {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 20px;
      margin-bottom: 20px;
    }
    .form-group {
      display: flex;
      flex-direction: column;
      gap: 8px;
      margin-bottom: 20px;
    }
    .form-label {
      font-size: 14px;
      font-weight: 600;
      color: var(--text-main);
    }
    .form-input, .form-select, .form-textarea {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      font-size: 14px;
      color: var(--text-main);
      background: #ffffff;
      outline: none;
      transition: border-color 0.2s;
    }
    .form-input:focus, .form-select:focus, .form-textarea:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.15);
    }
    .form-textarea {
      min-height: 120px;
      resize: vertical;
    }
    .btn-submit {
      width: 100%;
      padding: 14px;
      background: var(--primary);
      color: #ffffff;
      font-size: 16px;
      font-weight: 700;
      border: none;
      border-radius: var(--radius-sm);
      cursor: pointer;
      transition: background 0.2s ease;
    }
    .btn-submit:hover {
      background: var(--primary-dark);
    }
    /* Contact & QR Section */
    .contact-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 36px;
      box-shadow: var(--shadow-sm);
    }
    .contact-info-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }
    .contact-info-list li {
      font-size: 15px;
      color: var(--text-regular);
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .qr-container {
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      text-align: center;
      padding: 20px;
      background: var(--primary-soft);
      border-radius: var(--radius-md);
      border: 1px solid var(--border-light);
    }
    .qr-container img {
      width: 140px;
      height: 140px;
      object-fit: cover;
      border-radius: var(--radius-sm);
      margin-bottom: 12px;
      background: #ffffff;
      padding: 6px;
      box-shadow: var(--shadow-sm);
    }
    /* Articles & Friendly Links */
    .articles-box {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px;
      margin-bottom: 30px;
    }
    .article-links-wrap {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 14px;
    }
    .article-pill {
      display: inline-block;
      padding: 8px 16px;
      background: #f8fafc;
      border: 1px solid var(--border-color);
      border-radius: 20px;
      font-size: 13px;
      color: var(--text-regular);
    }
    .article-pill:hover {
      background: var(--primary-soft);
      border-color: var(--primary-light);
      color: var(--primary);
    }
    /* Footer */
    .site-footer {
      background: #ffffff;
      border-top: 1px solid var(--border-color);
      padding: 50px 0 30px 0;
      color: var(--text-muted);
      font-size: 14px;
    }
    .footer-top {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 40px;
      padding-bottom: 36px;
      border-bottom: 1px solid #f1f5f9;
      margin-bottom: 24px;
    }
    .footer-brand p {
      margin-top: 12px;
      font-size: 14px;
      line-height: 1.8;
      max-width: 440px;
    }
    .footer-col h5 {
      font-size: 15px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 16px;
    }
    .footer-links-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .footer-links-list a {
      color: var(--text-muted);
      font-size: 14px;
    }
    .footer-links-list a:hover {
      color: var(--primary);
    }
    .friend-links-area {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 16px;
      padding: 16px 0;
      border-bottom: 1px solid #f1f5f9;
      margin-bottom: 24px;
      font-size: 13px;
    }
    .friend-links-area span {
      font-weight: 700;
      color: var(--text-main);
    }
    .friend-links-area a {
      color: var(--text-regular);
    }
    .friend-links-area a:hover {
      color: var(--primary);
    }
    .footer-bottom {
      text-align: center;
      font-size: 13px;
      color: var(--text-muted);
    }
    /* Floating Tool */
    .floating-kefu {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      background: var(--primary);
      color: #ffffff;
      padding: 12px 18px;
      border-radius: 30px;
      box-shadow: 0 8px 24px rgba(5, 150, 105, 0.35);
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 14px;
      font-weight: 600;
      cursor: pointer;
      transition: all 0.3s ease;
    }
    .floating-kefu:hover {
      transform: translateY(-3px);
      background: var(--primary-dark);
      color: #ffffff;
    }
    /* Responsive Breakpoints */
    @media (max-width: 1024px) {
      .grid-4, .process-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .hero-stats-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3, .review-grid, .banner-gallery {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-top {
        grid-template-columns: 1fr;
      }
    }
    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #ffffff;
        flex-direction: column;
        padding: 20px;
        box-shadow: var(--shadow-md);
        border-bottom: 1px solid var(--border-color);
      }
      .nav-links.show {
        display: flex;
      }
      .mobile-menu-toggle {
        display: block;
      }
      .hero-title {
        font-size: 30px;
      }
      .grid-3, .grid-2, .review-grid, .banner-gallery, .contact-grid, .form-row {
        grid-template-columns: 1fr;
      }
      .section-title {
        font-size: 26px;
      }
      .hero-stats-grid {
        grid-template-columns: 1fr 1fr;
      }
    }