:root {
      --primary: #4f46e5;
      --primary-vivid: #6366f1;
      --secondary: #ec4899;
      --accent-cyan: #06b6d4;
      --accent-amber: #f59e0b;
      --accent-emerald: #10b981;
      --dark-text: #0f172a;
      --body-text: #334155;
      --muted-text: #64748b;
      --bg-light: #f8fafc;
      --bg-card: #ffffff;
      --border-color: #e2e8f0;
      --border-focus: #c7d2fe;
      --gradient-vibrant: linear-gradient(135deg, #4f46e5 0%, #7c3aed 50%, #ec4899 100%);
      --gradient-cyan-blue: linear-gradient(135deg, #0284c7 0%, #2563eb 100%);
      --gradient-amber-rose: linear-gradient(135deg, #f59e0b 0%, #ef4444 100%);
      --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
      --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -1px rgba(0, 0, 0, 0.04);
      --shadow-lg: 0 10px 25px -3px rgba(79, 70, 229, 0.12), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
      --shadow-vivid: 0 12px 30px -5px rgba(236, 72, 153, 0.2);
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --radius-full: 9999px;
      --container-max: 1200px;
      --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    }

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

    html {
      scroll-behavior: smooth;
      font-size: 16px;
      background-color: var(--bg-light);
    }

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      color: var(--dark-text);
      line-height: 1.65;
      background: radial-gradient(circle at 10% 20%, rgba(99, 102, 241, 0.05) 0%, transparent 40%),
                  radial-gradient(circle at 90% 80%, rgba(236, 72, 153, 0.05) 0%, transparent 40%),
                  #f8fafc;
      min-height: 100vh;
      display: flex;
      flex-direction: column;
      overflow-x: hidden;
    }

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

    /* 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 var(--border-color);
      box-shadow: 0 2px 10px rgba(0, 0, 0, 0.03);
    }

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

    .brand-area {
      display: flex;
      align-items: center;
      gap: 12px;
      text-decoration: none;
    }

    .ai-page-logo {
      height: 38px;
      width: auto;
      display: block;
      object-fit: contain;
    }

    .brand-text {
      font-size: 1.25rem;
      font-weight: 800;
      background: var(--gradient-vibrant);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      letter-spacing: -0.02em;
    }

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

    .nav-links li a {
      display: block;
      padding: 8px 12px;
      color: var(--body-text);
      text-decoration: none;
      font-size: 0.95rem;
      font-weight: 500;
      transition: var(--transition);
      border-radius: var(--radius-sm);
    }

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

    .header-actions {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-weight: 600;
      padding: 10px 20px;
      font-size: 0.95rem;
      border-radius: var(--radius-full);
      text-decoration: none;
      transition: var(--transition);
      cursor: pointer;
      border: 1px solid transparent;
      line-height: 1.2;
    }

    .btn-primary {
      background: var(--gradient-vibrant);
      color: #ffffff !important;
      box-shadow: 0 4px 14px rgba(99, 102, 241, 0.35);
    }

    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(99, 102, 241, 0.45);
    }

    .btn-secondary {
      background: #ffffff;
      color: var(--dark-text) !important;
      border-color: var(--border-color);
      box-shadow: var(--shadow-sm);
    }

    .btn-secondary:hover {
      border-color: var(--primary-vivid);
      color: var(--primary) !important;
      background: #f8fafc;
    }

    .btn-accent {
      background: var(--gradient-amber-rose);
      color: #ffffff !important;
      box-shadow: 0 4px 14px rgba(245, 158, 11, 0.3);
    }

    .btn-accent:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(245, 158, 11, 0.4);
    }

    .btn-sm {
      padding: 6px 14px;
      font-size: 0.85rem;
    }

    .btn-lg {
      padding: 14px 32px;
      font-size: 1.1rem;
    }

    .mobile-menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.5rem;
      color: var(--dark-text);
      cursor: pointer;
      padding: 6px;
    }

    /* Section Global */
    section {
      padding: 70px 0;
      position: relative;
    }

    .section-header {
      text-align: center;
      max-width: 800px;
      margin: 0 auto 48px auto;
    }

    .section-tag {
      display: inline-block;
      padding: 4px 14px;
      font-size: 0.85rem;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.05em;
      color: var(--primary);
      background: rgba(99, 102, 241, 0.1);
      border-radius: var(--radius-full);
      margin-bottom: 12px;
    }

    .section-title {
      font-size: 2.1rem;
      font-weight: 800;
      color: var(--dark-text);
      line-height: 1.3;
      margin-bottom: 14px;
    }

    .section-subtitle {
      font-size: 1.05rem;
      color: var(--muted-text);
      line-height: 1.6;
    }

    /* Hero Section (STRICTLY NO IMAGES) */
    .hero-section {
      padding: 80px 0 60px 0;
      background: linear-gradient(180deg, rgba(241, 245, 249, 0.6) 0%, rgba(255, 255, 255, 1) 100%);
      position: relative;
      overflow: hidden;
    }

    .hero-container {
      text-align: center;
      position: relative;
      z-index: 2;
    }

    .hero-badge-wrap {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      padding: 6px 16px;
      border-radius: var(--radius-full);
      box-shadow: var(--shadow-sm);
      margin-bottom: 24px;
    }

    .badge-dot {
      width: 8px;
      height: 8px;
      background: var(--accent-emerald);
      border-radius: 50%;
      box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.2);
    }

    .badge-text {
      font-size: 0.88rem;
      font-weight: 600;
      color: var(--body-text);
    }

    .hero-title {
      font-size: 2.8rem;
      font-weight: 900;
      color: var(--dark-text);
      line-height: 1.25;
      margin-bottom: 20px;
      letter-spacing: -0.03em;
    }

    .hero-title span {
      background: var(--gradient-vibrant);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-desc {
      font-size: 1.18rem;
      color: var(--muted-text);
      max-width: 820px;
      margin: 0 auto 36px auto;
      line-height: 1.7;
    }

    .hero-cta-group {
      display: flex;
      justify-content: center;
      align-items: center;
      flex-wrap: wrap;
      gap: 16px;
      margin-bottom: 48px;
    }

    /* Hero Metrics Bar (Pure CSS Data Cards) */
    .hero-metrics {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
      max-width: 1000px;
      margin: 0 auto;
    }

    .metric-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 20px 16px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      text-align: center;
    }

    .metric-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: var(--primary-vivid);
    }

    .metric-value {
      font-size: 1.8rem;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 4px;
    }

    .metric-label {
      font-size: 0.85rem;
      color: var(--muted-text);
      font-weight: 500;
    }

    /* Model Tags Marquee Bar */
    .model-bar {
      background: #ffffff;
      border-top: 1px solid var(--border-color);
      border-bottom: 1px solid var(--border-color);
      padding: 16px 0;
      overflow: hidden;
    }

    .model-tag-list {
      display: flex;
      gap: 12px;
      flex-wrap: wrap;
      justify-content: center;
    }

    .model-tag {
      background: #f1f5f9;
      color: var(--body-text);
      font-size: 0.85rem;
      font-weight: 600;
      padding: 6px 14px;
      border-radius: var(--radius-full);
      border: 1px solid #e2e8f0;
      transition: var(--transition);
    }

    .model-tag:hover {
      background: var(--primary-vivid);
      color: #ffffff;
      border-color: var(--primary-vivid);
    }

    /* Cards Grid System */
    .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: 28px;
    }

    /* Service & Feature Card */
    .card-feature {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
      position: relative;
    }

    .card-feature:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-lg);
      border-color: rgba(99, 102, 241, 0.4);
    }

    .card-icon {
      width: 48px;
      height: 48px;
      border-radius: var(--radius-sm);
      background: rgba(99, 102, 241, 0.1);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.4rem;
      margin-bottom: 20px;
      font-weight: bold;
    }

    .card-icon.pink {
      background: rgba(236, 72, 153, 0.1);
      color: var(--secondary);
    }

    .card-icon.cyan {
      background: rgba(6, 182, 212, 0.1);
      color: var(--accent-cyan);
    }

    .card-icon.amber {
      background: rgba(245, 158, 11, 0.1);
      color: var(--accent-amber);
    }

    .card-title {
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--dark-text);
      margin-bottom: 10px;
    }

    .card-desc {
      font-size: 0.95rem;
      color: var(--body-text);
      line-height: 1.6;
      flex-grow: 1;
    }

    .card-meta {
      margin-top: 18px;
      padding-top: 14px;
      border-top: 1px dashed var(--border-color);
      font-size: 0.85rem;
      color: var(--primary);
      font-weight: 600;
    }

    /* Flow / Process Timeline */
    .process-steps {
      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;
      position: relative;
      box-shadow: var(--shadow-sm);
    }

    .step-number {
      position: absolute;
      top: 16px;
      right: 16px;
      font-size: 2rem;
      font-weight: 900;
      color: #e2e8f0;
      line-height: 1;
    }

    .step-title {
      font-size: 1.15rem;
      font-weight: 700;
      color: var(--dark-text);
      margin-bottom: 8px;
    }

    .step-text {
      font-size: 0.9rem;
      color: var(--body-text);
    }

    /* Comparison Table Section */
    .compare-box {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 32px;
      box-shadow: var(--shadow-md);
      overflow-x: auto;
    }

    .rating-banner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      background: linear-gradient(135deg, rgba(79, 70, 229, 0.08) 0%, rgba(236, 72, 153, 0.08) 100%);
      padding: 20px 24px;
      border-radius: var(--radius-md);
      margin-bottom: 28px;
      border: 1px solid rgba(99, 102, 241, 0.15);
    }

    .rating-score {
      display: flex;
      align-items: baseline;
      gap: 8px;
    }

    .rating-number {
      font-size: 2.8rem;
      font-weight: 900;
      color: var(--primary);
      line-height: 1;
    }

    .rating-scale {
      font-size: 1.1rem;
      color: var(--muted-text);
      font-weight: 600;
    }

    .rating-stars {
      color: #f59e0b;
      font-size: 1.4rem;
      letter-spacing: 2px;
    }

    .compare-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
    }

    .compare-table th,
    .compare-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
      font-size: 0.95rem;
    }

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

    .compare-table tr:last-child td {
      border-bottom: none;
    }

    .col-highlight {
      background: rgba(99, 102, 241, 0.03);
      font-weight: 600;
      color: var(--primary);
    }

    .status-check {
      color: var(--accent-emerald);
      font-weight: bold;
    }

    /* Media Library Display in lower sections */
    .media-gallery-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 20px;
    }

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

    .media-img-wrap {
      width: 100%;
      background: #e2e8f0;
      display: flex;
      align-items: center;
      justify-content: center;
    }

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

    .media-content {
      padding: 20px;
    }

    .media-title {
      font-size: 1.15rem;
      font-weight: 700;
      margin-bottom: 8px;
    }

    .media-desc {
      font-size: 0.9rem;
      color: var(--body-text);
    }

    /* Testimonials (6 reviews) */
    .testimonial-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;
    }

    .testimonial-quote {
      font-size: 0.95rem;
      color: var(--body-text);
      line-height: 1.65;
      margin-bottom: 18px;
      position: relative;
    }

    .testimonial-user {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid #f1f5f9;
      padding-top: 14px;
    }

    .user-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: var(--gradient-vibrant);
      color: #fff;
      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(--dark-text);
    }

    .user-role {
      font-size: 0.82rem;
      color: var(--muted-text);
    }

    /* FAQ Accordion */
    .faq-list {
      max-width: 900px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }

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

    .faq-item:hover {
      border-color: var(--border-focus);
    }

    .faq-question {
      width: 100%;
      text-align: left;
      background: none;
      border: none;
      padding: 20px 24px;
      font-size: 1.05rem;
      font-weight: 700;
      color: var(--dark-text);
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
    }

    .faq-toggle-icon {
      font-size: 1.25rem;
      color: var(--primary);
      transition: transform 0.25s ease;
    }

    .faq-answer {
      display: none;
      padding: 0 24px 20px 24px;
      color: var(--body-text);
      font-size: 0.95rem;
      line-height: 1.65;
    }

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

    .faq-item.active .faq-toggle-icon {
      transform: rotate(45deg);
    }

    /* Form & Contact Section */
    .contact-wrapper {
      display: grid;
      grid-template-columns: 1fr 1.2fr;
      gap: 36px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 40px;
      box-shadow: var(--shadow-md);
    }

    .contact-info {
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .contact-info-title {
      font-size: 1.5rem;
      font-weight: 800;
      margin-bottom: 12px;
      color: var(--dark-text);
    }

    .contact-info-desc {
      font-size: 0.95rem;
      color: var(--muted-text);
      margin-bottom: 24px;
      line-height: 1.6;
    }

    .contact-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 16px;
      margin-bottom: 24px;
    }

    .contact-list-item {
      display: flex;
      align-items: center;
      gap: 12px;
      font-size: 0.95rem;
      color: var(--body-text);
    }

    .contact-list-item strong {
      color: var(--dark-text);
      min-width: 80px;
    }

    .qr-box {
      background: #f8fafc;
      border: 1px dashed var(--border-color);
      padding: 16px;
      border-radius: var(--radius-md);
      text-align: center;
      display: inline-block;
      max-width: 170px;
    }

    .qr-box img {
      width: 130px;
      height: 130px;
      display: block;
      margin: 0 auto 8px auto;
      object-fit: contain;
      border-radius: 4px;
    }

    .qr-box span {
      font-size: 0.8rem;
      font-weight: 600;
      color: var(--muted-text);
    }

    .custom-form {
      display: flex;
      flex-direction: column;
      gap: 18px;
    }

    .form-group {
      display: flex;
      flex-direction: column;
      gap: 6px;
    }

    .form-group label {
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--dark-text);
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      font-size: 0.95rem;
      color: var(--dark-text);
      background: #ffffff;
      outline: none;
      transition: var(--transition);
      font-family: inherit;
    }

    .form-control:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
    }

    textarea.form-control {
      min-height: 110px;
      resize: vertical;
    }

    /* Articles & Links Grid */
    .article-tags-wrap {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      margin-bottom: 24px;
    }

    .article-links-row {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 14px;
    }

    .article-pill {
      background: #f1f5f9;
      color: var(--body-text);
      padding: 8px 16px;
      border-radius: var(--radius-full);
      text-decoration: none;
      font-size: 0.88rem;
      transition: var(--transition);
      border: 1px solid #e2e8f0;
    }

    .article-pill:hover {
      background: var(--primary);
      color: #ffffff;
      border-color: var(--primary);
    }

    /* Footer Styles */
    .site-footer {
      background: #ffffff;
      border-top: 1px solid var(--border-color);
      padding: 48px 0 24px 0;
      margin-top: auto;
      color: var(--body-text);
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1fr;
      gap: 32px;
      margin-bottom: 36px;
    }

    .footer-brand p {
      font-size: 0.9rem;
      color: var(--muted-text);
      margin-top: 12px;
      line-height: 1.6;
    }

    .footer-col-title {
      font-size: 1rem;
      font-weight: 700;
      color: var(--dark-text);
      margin-bottom: 16px;
    }

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

    .footer-nav a {
      color: var(--muted-text);
      text-decoration: none;
      font-size: 0.9rem;
      transition: var(--transition);
    }

    .footer-nav a:hover {
      color: var(--primary);
    }

    .friend-links-area {
      padding: 16px 0;
      border-top: 1px solid var(--border-color);
      margin-bottom: 24px;
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 14px;
      font-size: 0.88rem;
    }

    .friend-links-label {
      font-weight: 700;
      color: var(--dark-text);
    }

    .friend-links-area a {
      color: var(--muted-text);
      text-decoration: none;
      transition: var(--transition);
    }

    .friend-links-area a:hover {
      color: var(--primary);
    }

    .footer-bottom {
      border-top: 1px solid var(--border-color);
      padding-top: 20px;
      text-align: center;
      font-size: 0.85rem;
      color: var(--muted-text);
    }

    /* Floating Customer Service Button */
    .floating-widget {
      position: fixed;
      bottom: 30px;
      right: 30px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .float-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: var(--gradient-vibrant);
      color: #ffffff;
      border: none;
      box-shadow: 0 4px 16px rgba(99, 102, 241, 0.4);
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      font-size: 1.2rem;
      transition: var(--transition);
      text-decoration: none;
    }

    .float-btn:hover {
      transform: scale(1.08);
    }

    /* Responsive */
    @media (max-width: 992px) {
      .grid-4, .process-steps {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
      .hero-metrics {
        grid-template-columns: repeat(2, 1fr);
      }
      .contact-wrapper {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 768px) {
      .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.show {
        display: flex;
      }

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

      .grid-3, .grid-4, .grid-2, .hero-metrics, .media-gallery-grid, .process-steps {
        grid-template-columns: 1fr;
      }

      .hero-title {
        font-size: 2rem;
      }

      .section-title {
        font-size: 1.6rem;
      }

      .footer-grid {
        grid-template-columns: 1fr;
      }
    }