/* CSS Standard Reset & Basic Variables */
    :root {
      --primary-gradient: linear-gradient(135deg, #6366f1 0%, #a855f7 50%, #ec4899 100%);
      --holo-glow: linear-gradient(135deg, rgba(99, 102, 241, 0.15) 0%, rgba(168, 85, 247, 0.15) 50%, rgba(236, 72, 153, 0.15) 100%);
      --bg-main: #f8fafc;
      --bg-card: #ffffff;
      --text-main: #0f172a;
      --text-muted: #475569;
      --border-color: #e2e8f0;
      --accent-color: #6366f1;
      --radius-lg: 16px;
      --radius-md: 10px;
      --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.03);
      --shadow-md: 0 10px 25px rgba(99, 102, 241, 0.08);
      --shadow-lg: 0 20px 40px rgba(168, 85, 247, 0.12);
      --container-width: 1200px;
    }

    * {
      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-main);
      color: var(--text-main);
      line-height: 1.6;
    }

    body {
      overflow-x: hidden;
      background: linear-gradient(180deg, #f1f5f9 0%, #f8fafc 50%, #f1f5f9 100%);
    }

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

    a:hover {
      opacity: 0.85;
    }

    ul, ol {
      list-style: none;
    }

    /* Container Utility */
    .container {
      max-width: var(--container-width);
      margin: 0 auto;
      padding: 0 20px;
      width: 100%;
    }

    /* Header & Navigation */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(226, 232, 240, 0.8);
      box-shadow: 0 2px 10px rgba(0, 0, 0, 0.02);
    }

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

    .brand-logo {
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .ai-page-logo {
      height: 40px;
      width: auto;
      object-fit: contain;
    }

    /* Strict requirement: .nav-links gap must be 0 */
    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
    }

    .nav-links a {
      color: var(--text-main);
      font-weight: 500;
      font-size: 14px;
      padding: 8px 12px;
      border-radius: 6px;
      white-space: nowrap;
    }

    .nav-links a:hover {
      background: rgba(99, 102, 241, 0.08);
      color: var(--accent-color);
    }

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

    .btn-holo {
      background: var(--primary-gradient);
      color: #ffffff !important;
      padding: 9px 20px;
      border-radius: 30px;
      font-weight: 600;
      font-size: 14px;
      box-shadow: 0 4px 15px rgba(168, 85, 247, 0.3);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      border: none;
      cursor: pointer;
      transition: transform 0.2s ease, box-shadow 0.2s ease;
    }

    .btn-holo:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(168, 85, 247, 0.45);
    }

    .btn-outline {
      border: 1px solid #cbd5e1;
      color: var(--text-main);
      padding: 8px 18px;
      border-radius: 30px;
      font-weight: 500;
      font-size: 14px;
      background: #ffffff;
    }

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

    .mobile-menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      color: var(--text-main);
      cursor: pointer;
    }

    /* Section Global Standard */
    .section-padding {
      padding: 70px 0;
    }

    .section-header {
      text-align: center;
      max-width: 750px;
      margin: 0 auto 50px auto;
    }

    .section-badge {
      display: inline-block;
      padding: 4px 14px;
      border-radius: 20px;
      background: rgba(99, 102, 241, 0.1);
      color: var(--accent-color);
      font-size: 13px;
      font-weight: 600;
      margin-bottom: 12px;
      letter-spacing: 0.5px;
    }

    .section-title {
      font-size: 30px;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 12px;
      letter-spacing: -0.5px;
    }

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

    /* Hero Section (No Images Allowed) */
    .hero-section {
      padding: 90px 0 60px 0;
      background: linear-gradient(135deg, rgba(248, 249, 255, 0.9) 0%, rgba(243, 244, 255, 0.9) 50%, rgba(253, 242, 248, 0.9) 100%);
      border-bottom: 1px solid rgba(226, 232, 240, 0.6);
      text-align: center;
      position: relative;
    }

    .hero-tag {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 18px;
      border-radius: 30px;
      background: #ffffff;
      border: 1px solid rgba(168, 85, 247, 0.3);
      box-shadow: 0 4px 12px rgba(168, 85, 247, 0.08);
      font-size: 13px;
      font-weight: 600;
      color: #7c3aed;
      margin-bottom: 24px;
    }

    /* Strict requirement: H1 < 20 chars */
    .hero-h1 {
      font-size: 38px;
      font-weight: 900;
      line-height: 1.25;
      color: #0f172a;
      margin-bottom: 20px;
      letter-spacing: -1px;
    }

    .hero-subtitle {
      font-size: 17px;
      color: var(--text-muted);
      max-width: 800px;
      margin: 0 auto 36px auto;
      line-height: 1.7;
    }

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

    .btn-hero-main {
      padding: 14px 32px;
      font-size: 16px;
      border-radius: 30px;
    }

    .hero-features-bar {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
      gap: 16px;
      margin-top: 30px;
    }

    .hero-feature-item {
      background: #ffffff;
      padding: 16px;
      border-radius: var(--radius-md);
      border: 1px solid #e2e8f0;
      box-shadow: var(--shadow-sm);
      text-align: center;
    }

    .hero-feature-title {
      font-weight: 700;
      font-size: 15px;
      color: var(--text-main);
    }

    .hero-feature-desc {
      font-size: 12px;
      color: var(--text-muted);
      margin-top: 4px;
    }

    /* Cards & Grid Styling */
    .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(250px, 1fr));
      gap: 20px;
    }

    .holo-card {
      background: var(--bg-card);
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      padding: 28px;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
      position: relative;
    }

    .holo-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: rgba(168, 85, 247, 0.4);
    }

    .card-icon-box {
      width: 48px;
      height: 48px;
      border-radius: 12px;
      background: var(--holo-glow);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 22px;
      color: var(--accent-color);
      margin-bottom: 18px;
      font-weight: bold;
    }

    .card-title {
      font-size: 18px;
      font-weight: 700;
      margin-bottom: 10px;
      color: var(--text-main);
    }

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

    /* Data Counter Cards */
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
      gap: 20px;
    }

    .metric-card {
      background: #ffffff;
      padding: 24px;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      text-align: center;
      background: linear-gradient(135deg, #ffffff 0%, #fcfafd 100%);
    }

    .metric-num {
      font-size: 34px;
      font-weight: 900;
      background: var(--primary-gradient);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      margin-bottom: 6px;
    }

    .metric-label {
      font-size: 14px;
      color: var(--text-muted);
      font-weight: 500;
    }

    /* 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-lg);
      border: 1px solid var(--border-color);
      position: relative;
    }

    .step-num {
      font-size: 13px;
      font-weight: 800;
      color: #a855f7;
      background: rgba(168, 85, 247, 0.1);
      padding: 2px 10px;
      border-radius: 12px;
      display: inline-block;
      margin-bottom: 12px;
    }

    /* Models Cloud Tag */
    .models-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-top: 24px;
    }

    .model-tag {
      background: #ffffff;
      border: 1px solid var(--border-color);
      padding: 6px 14px;
      border-radius: 20px;
      font-size: 13px;
      font-weight: 600;
      color: var(--text-main);
      box-shadow: 0 2px 6px rgba(0,0,0,0.02);
    }

    /* Comparison Table (Strict 5 Stars, 9.9/10 requirement) */
    .comparison-wrapper {
      background: #ffffff;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      overflow-x: auto;
      box-shadow: var(--shadow-sm);
    }

    .comparison-badge-box {
      background: var(--holo-glow);
      padding: 20px;
      text-align: center;
      border-bottom: 1px solid var(--border-color);
    }

    .rating-stars {
      color: #f59e0b;
      font-size: 24px;
      margin-bottom: 4px;
    }

    .rating-score {
      font-size: 20px;
      font-weight: 800;
      color: var(--text-main);
    }

    .comparison-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 650px;
    }

    .comparison-table th, .comparison-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
      font-size: 14px;
    }

    .comparison-table th {
      background: #f8fafc;
      font-weight: 700;
      color: var(--text-main);
    }

    .highlight-cell {
      background: rgba(99, 102, 241, 0.04);
      font-weight: 700;
      color: var(--accent-color);
    }

    /* Media Library Display Section */
    .media-display-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 20px;
      margin-top: 30px;
    }

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

    .ai-page-image {
      width: 100%;
      height: auto;
      display: block;
      object-fit: cover;
    }

    .media-info {
      padding: 16px;
    }

    .media-title {
      font-weight: 700;
      font-size: 15px;
      margin-bottom: 4px;
    }

    /* FAQ Section */
    .faq-accordion {
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

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

    .faq-header {
      padding: 18px 24px;
      font-weight: 700;
      font-size: 15px;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      background: #ffffff;
      user-select: none;
    }

    .faq-header::after {
      content: '+';
      font-size: 20px;
      color: var(--accent-color);
      transition: transform 0.2s ease;
    }

    .faq-item.active .faq-header::after {
      content: '-';
    }

    .faq-content {
      padding: 0 24px 18px 24px;
      font-size: 14px;
      color: var(--text-muted);
      display: none;
      line-height: 1.7;
    }

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

    /* Testimonials Section */
    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
      gap: 20px;
    }

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

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

    .user-avatar-placeholder {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: var(--primary-gradient);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: bold;
    }

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

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

    /* Form Section */
    .form-wrapper {
      background: #ffffff;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      padding: 36px;
      box-shadow: var(--shadow-md);
      max-width: 700px;
      margin: 0 auto;
    }

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

    .form-label {
      display: block;
      font-weight: 600;
      font-size: 14px;
      margin-bottom: 8px;
    }

    .form-input, .form-select, .form-textarea {
      width: 100%;
      padding: 12px 16px;
      border-radius: 8px;
      border: 1px solid var(--border-color);
      font-size: 14px;
      background: #f8fafc;
      transition: border-color 0.2s ease;
    }

    .form-input:focus, .form-select:focus, .form-textarea:focus {
      outline: none;
      border-color: var(--accent-color);
      background: #ffffff;
    }

    .form-submit-btn {
      width: 100%;
      padding: 14px;
      font-size: 16px;
      font-weight: 700;
    }

    /* Contact Cards */
    .contact-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
      gap: 20px;
      margin-top: 30px;
    }

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

    .contact-qr-img {
      max-width: 140px;
      height: auto;
      margin: 12px auto;
      border-radius: 8px;
      border: 1px solid var(--border-color);
    }

    /* Article List */
    .articles-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 16px;
    }

    .article-item {
      background: #ffffff;
      padding: 18px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
    }

    .article-link {
      font-weight: 600;
      font-size: 15px;
      color: var(--text-main);
      display: block;
      margin-bottom: 6px;
    }

    .article-link:hover {
      color: var(--accent-color);
    }

    /* Footer Section */
    .site-footer {
      background: #0f172a;
      color: #94a3b8;
      padding: 60px 0 30px 0;
      border-top: 1px solid #1e293b;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
      gap: 30px;
      margin-bottom: 40px;
    }

    .footer-col-title {
      color: #ffffff;
      font-size: 16px;
      font-weight: 700;
      margin-bottom: 16px;
    }

    .footer-links li {
      margin-bottom: 10px;
    }

    .footer-links a {
      color: #94a3b8;
      font-size: 14px;
    }

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

    .friend-links-box {
      border-top: 1px solid #1e293b;
      padding-top: 24px;
      margin-bottom: 24px;
      display: flex;
      flex-wrap: wrap;
      gap: 14px;
      align-items: center;
    }

    .friend-links-box span {
      color: #ffffff;
      font-weight: 600;
      font-size: 14px;
    }

    .friend-links-box a {
      color: #94a3b8;
      font-size: 13px;
    }

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

    .footer-bottom {
      border-top: 1px solid #1e293b;
      padding-top: 24px;
      text-align: center;
      font-size: 13px;
      color: #64748b;
    }

    /* Floating Customer Service */
    .float-kefu {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      background: var(--primary-gradient);
      color: #ffffff;
      padding: 12px 20px;
      border-radius: 30px;
      box-shadow: 0 10px 25px rgba(168, 85, 247, 0.4);
      font-weight: 600;
      font-size: 14px;
      display: flex;
      align-items: center;
      gap: 8px;
    }

    /* Responsive Mobile Navigation */
    @media (max-width: 992px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #ffffff;
        flex-direction: column;
        padding: 20px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-md);
      }

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

      .mobile-menu-toggle {
        display: block;
      }

      .hero-h1 {
        font-size: 28px;
      }
    }