:root {
      --primary-color: #4f46e5;
      --primary-gradient: linear-gradient(135deg, #4f46e5 0%, #7c3aed 50%, #ec4899 100%);
      --primary-light: #f5f3ff;
      --accent-color: #06b6d4;
      --text-main: #1e293b;
      --text-muted: #64748b;
      --bg-main: #faf5ff;
      --bg-surface: #ffffff;
      --border-color: #e2e8f0;
      --shadow-sm: 0 2px 8px rgba(99, 102, 241, 0.06);
      --shadow-md: 0 10px 25px -5px rgba(99, 102, 241, 0.1), 0 8px 10px -6px rgba(99, 102, 241, 0.05);
      --shadow-lg: 0 20px 35px -5px rgba(99, 102, 241, 0.15);
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --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;
    }

    body {
      background: radial-gradient(circle at 10% 20%, rgba(244, 232, 255, 0.6) 0%, rgba(240, 249, 255, 0.6) 90%), #faf8ff;
      color: var(--text-main);
      line-height: 1.6;
      font-size: 16px;
      overflow-x: hidden;
      min-height: 100vh;
      display: flex;
      flex-direction: column;
    }

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

    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-color);
      box-shadow: var(--shadow-sm);
    }

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

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

    .logo-box .ai-page-logo {
      height: 42px;
      width: auto;
      object-fit: contain;
    }

    .logo-box .brand-title {
      font-size: 1.35rem;
      font-weight: 800;
      background: var(--primary-gradient);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      letter-spacing: -0.5px;
    }

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

    .nav-links a {
      color: #334155;
      text-decoration: none;
      font-weight: 500;
      font-size: 0.95rem;
      padding: 8px 14px;
      border-radius: var(--radius-sm);
      transition: all 0.25s ease;
      white-space: nowrap;
    }

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

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

    .btn-nav-primary {
      background: var(--primary-gradient);
      color: #ffffff !important;
      padding: 9px 20px !important;
      font-weight: 600 !important;
      box-shadow: 0 4px 14px rgba(124, 58, 237, 0.3);
    }

    .btn-nav-primary:hover {
      transform: translateY(-1px);
      box-shadow: 0 6px 20px rgba(124, 58, 237, 0.45);
    }

    .mobile-toggle {
      display: none;
      background: none;
      border: 1px solid var(--border-color);
      padding: 6px 10px;
      border-radius: var(--radius-sm);
      cursor: pointer;
      font-size: 1.25rem;
      color: var(--text-main);
    }

    main {
      flex: 1;
    }

    section {
      padding: 70px 0;
      position: relative;
    }

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

    .badge {
      display: inline-block;
      padding: 6px 16px;
      background: linear-gradient(135deg, rgba(79, 70, 229, 0.1), rgba(236, 72, 153, 0.1));
      color: var(--primary-color);
      font-size: 0.875rem;
      font-weight: 700;
      border-radius: 50px;
      border: 1px solid rgba(79, 70, 229, 0.2);
      margin-bottom: 14px;
      letter-spacing: 0.5px;
    }

    .section-title {
      font-size: 2.25rem;
      font-weight: 800;
      color: #0f172a;
      line-height: 1.3;
      margin-bottom: 14px;
    }

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

    /* Hero Section (No Images Allowed) */
    .hero-section {
      padding: 85px 0 60px;
      background: linear-gradient(180deg, rgba(245, 243, 255, 0.8) 0%, rgba(255, 255, 255, 0.5) 100%);
      position: relative;
      overflow: hidden;
    }

    .hero-decor-1, .hero-decor-2 {
      position: absolute;
      width: 450px;
      height: 450px;
      border-radius: 50%;
      filter: blur(80px);
      z-index: 0;
      pointer-events: none;
      opacity: 0.5;
    }

    .hero-decor-1 {
      top: -100px;
      left: -100px;
      background: rgba(147, 51, 234, 0.25);
    }

    .hero-decor-2 {
      bottom: -150px;
      right: -100px;
      background: rgba(236, 72, 153, 0.2);
    }

    .hero-content {
      position: relative;
      z-index: 1;
      text-align: center;
      max-width: 960px;
      margin: 0 auto;
    }

    .hero-title {
      font-size: 2.85rem;
      font-weight: 900;
      line-height: 1.25;
      margin-bottom: 22px;
      color: #0f172a;
      letter-spacing: -0.5px;
    }

    .hero-highlight {
      background: var(--primary-gradient);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-desc {
      font-size: 1.2rem;
      color: #475569;
      margin-bottom: 36px;
      max-width: 820px;
      margin-left: auto;
      margin-right: auto;
      line-height: 1.7;
    }

    .hero-actions {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 18px;
      flex-wrap: wrap;
      margin-bottom: 45px;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 14px 32px;
      font-size: 1.05rem;
      font-weight: 700;
      border-radius: var(--radius-md);
      text-decoration: none;
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
      cursor: pointer;
      border: none;
    }

    .btn-main-official {
      background: var(--primary-gradient);
      color: #ffffff;
      box-shadow: 0 10px 25px rgba(124, 58, 237, 0.35);
    }

    .btn-main-official:hover {
      transform: translateY(-2px);
      box-shadow: 0 15px 30px rgba(124, 58, 237, 0.45);
    }

    .btn-secondary {
      background: #ffffff;
      color: #1e293b;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

    .btn-secondary:hover {
      border-color: #cbd5e1;
      background: #f8fafc;
      transform: translateY(-2px);
    }

    .hero-metrics {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      margin-top: 40px;
    }

    .metric-card {
      background: rgba(255, 255, 255, 0.85);
      border: 1px solid rgba(226, 232, 240, 0.8);
      padding: 24px 16px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
      text-align: center;
      transition: all 0.3s ease;
    }

    .metric-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: rgba(147, 51, 234, 0.4);
    }

    .metric-num {
      font-size: 2.1rem;
      font-weight: 800;
      color: #4338ca;
      margin-bottom: 4px;
    }

    .metric-label {
      font-size: 0.95rem;
      color: var(--text-muted);
      font-weight: 500;
    }

    /* Tag Cloud & Model Aggregate */
    .model-strip {
      background: #ffffff;
      padding: 30px 20px;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      margin-bottom: 50px;
    }

    .model-strip-title {
      font-size: 1rem;
      font-weight: 700;
      color: var(--text-muted);
      text-align: center;
      margin-bottom: 18px;
      text-transform: uppercase;
      letter-spacing: 1px;
    }

    .tag-cloud {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 10px;
    }

    .model-tag {
      padding: 6px 14px;
      background: #f8fafc;
      border: 1px solid #e2e8f0;
      border-radius: 20px;
      font-size: 0.875rem;
      font-weight: 600;
      color: #334155;
      transition: all 0.2s ease;
    }

    .model-tag:hover {
      background: var(--primary-light);
      border-color: #c4b5fd;
      color: var(--primary-color);
      transform: scale(1.05);
    }

    /* Grid Layouts */
    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 30px;
      align-items: center;
    }

    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }

    /* Service Cards */
    .service-card {
      background: #ffffff;
      border: 1px solid #f1f5f9;
      border-radius: var(--radius-md);
      padding: 28px;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .service-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-lg);
      border-color: #ddd6fe;
    }

    .service-icon {
      width: 52px;
      height: 52px;
      border-radius: 12px;
      background: var(--primary-light);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.6rem;
      margin-bottom: 20px;
    }

    .service-card h3 {
      font-size: 1.25rem;
      font-weight: 700;
      color: #1e293b;
      margin-bottom: 10px;
    }

    .service-card p {
      color: var(--text-muted);
      font-size: 0.95rem;
      line-height: 1.6;
      margin-bottom: 16px;
    }

    .feature-list {
      list-style: none;
      margin-top: auto;
    }

    .feature-list li {
      font-size: 0.875rem;
      color: #475569;
      margin-bottom: 6px;
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .feature-list li::before {
      content: "✓";
      color: #10b981;
      font-weight: bold;
    }

    /* Process Flow */
    .timeline {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      position: relative;
    }

    .timeline-step {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px 20px;
      position: relative;
      box-shadow: var(--shadow-sm);
    }

    .step-number {
      font-size: 1.8rem;
      font-weight: 900;
      color: rgba(99, 102, 241, 0.2);
      position: absolute;
      top: 15px;
      right: 20px;
    }

    .timeline-step h4 {
      font-size: 1.15rem;
      font-weight: 700;
      margin-bottom: 10px;
      color: #0f172a;
    }

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

    /* Comparison Table */
    .table-container {
      background: #ffffff;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-md);
      overflow-x: auto;
      padding: 8px;
    }

    .rating-banner {
      background: linear-gradient(135deg, #4338ca, #6366f1);
      color: #ffffff;
      padding: 24px;
      border-radius: var(--radius-md);
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: 16px;
      flex-wrap: wrap;
      gap: 16px;
    }

    .rating-banner h3 {
      font-size: 1.4rem;
      font-weight: 800;
    }

    .rating-score-box {
      display: flex;
      align-items: center;
      gap: 14px;
    }

    .stars {
      color: #fbbf24;
      font-size: 1.3rem;
      letter-spacing: 2px;
    }

    .score-badge {
      background: #ffffff;
      color: #4338ca;
      font-weight: 800;
      padding: 6px 14px;
      border-radius: 30px;
      font-size: 1.1rem;
    }

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

    .custom-table th, .custom-table td {
      padding: 18px 20px;
      border-bottom: 1px solid #f1f5f9;
      font-size: 0.95rem;
    }

    .custom-table th {
      background: #f8fafc;
      font-weight: 700;
      color: #334155;
    }

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

    .highlight-col {
      background: #faf5ff;
      font-weight: 600;
      color: #4f46e5;
    }

    /* Media/Banner Showcase in Body */
    .media-card {
      background: #ffffff;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
    }

    .media-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }

    .media-img-wrap {
      width: 100%;
      aspect-ratio: 16 / 9;
      background: #e2e8f0;
      overflow: hidden;
    }

    .media-img-wrap.square {
      aspect-ratio: 1 / 1;
    }

    .media-img-wrap img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      display: block;
      transition: transform 0.4s ease;
    }

    .media-card:hover img {
      transform: scale(1.03);
    }

    .media-info {
      padding: 20px;
    }

    .media-info h4 {
      font-size: 1.1rem;
      font-weight: 700;
      color: #1e293b;
      margin-bottom: 6px;
    }

    .media-info p {
      font-size: 0.875rem;
      color: var(--text-muted);
    }

    /* User Reviews */
    .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;
      height: 100%;
    }

    .review-text {
      font-size: 0.95rem;
      color: #334155;
      line-height: 1.6;
      margin-bottom: 20px;
      font-style: normal;
    }

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

    .reviewer-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: var(--primary-gradient);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1.1rem;
    }

    .reviewer-meta h5 {
      font-size: 0.95rem;
      font-weight: 700;
      color: #0f172a;
    }

    .reviewer-meta span {
      font-size: 0.8rem;
      color: var(--text-muted);
    }

    /* FAQ Accordion */
    .faq-wrapper {
      max-width: 900px;
      margin: 0 auto;
    }

    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      margin-bottom: 12px;
      overflow: hidden;
      transition: all 0.25s ease;
    }

    .faq-item.active {
      border-color: #c4b5fd;
      box-shadow: var(--shadow-sm);
    }

    .faq-question {
      padding: 20px 24px;
      cursor: pointer;
      font-weight: 700;
      font-size: 1.05rem;
      color: #1e293b;
      display: flex;
      align-items: center;
      justify-content: space-between;
      user-select: none;
    }

    .faq-toggle-icon {
      font-size: 1.3rem;
      color: var(--primary-color);
      transition: transform 0.3s ease;
    }

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

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s cubic-bezier(0.4, 0, 0.2, 1);
      background: #faf8ff;
    }

    .faq-answer-inner {
      padding: 0 24px 20px;
      color: #475569;
      font-size: 0.95rem;
      line-height: 1.7;
    }

    /* Articles & Resources */
    .article-item {
      padding: 16px 20px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      display: flex;
      justify-content: space-between;
      align-items: center;
      text-decoration: none;
      color: #334155;
      font-weight: 500;
      transition: all 0.2s ease;
    }

    .article-item:hover {
      background: var(--primary-light);
      border-color: #c4b5fd;
      color: var(--primary-color);
      transform: translateX(4px);
    }

    /* Form Section */
    .form-wrapper {
      background: #ffffff;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-md);
      padding: 40px;
    }

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

    .form-label {
      display: block;
      font-weight: 600;
      font-size: 0.95rem;
      color: #1e293b;
      margin-bottom: 8px;
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      font-size: 0.95rem;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      background: #f8fafc;
      color: var(--text-main);
      outline: none;
      transition: border-color 0.2s ease;
    }

    .form-control:focus {
      border-color: var(--primary-color);
      background: #ffffff;
    }

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

    /* Floating Customer Service & Back to Top */
    .float-widgets {
      position: fixed;
      right: 24px;
      bottom: 30px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .float-btn {
      width: 50px;
      height: 50px;
      border-radius: 50%;
      background: #ffffff;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-md);
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      color: #334155;
      font-size: 1.25rem;
      transition: all 0.2s ease;
      position: relative;
    }

    .float-btn:hover {
      background: var(--primary-color);
      color: #ffffff;
      transform: scale(1.08);
    }

    .qr-popup {
      position: absolute;
      right: 60px;
      bottom: 0;
      background: #ffffff;
      padding: 14px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-lg);
      border: 1px solid var(--border-color);
      display: none;
      width: 160px;
      text-align: center;
    }

    .qr-popup img {
      width: 100%;
      height: auto;
      display: block;
      border-radius: 4px;
      margin-bottom: 6px;
    }

    .qr-popup span {
      font-size: 0.75rem;
      color: var(--text-muted);
      display: block;
    }

    .float-btn:hover .qr-popup {
      display: block;
    }

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

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 40px;
      margin-bottom: 40px;
    }

    .footer-col h4 {
      color: #ffffff;
      font-size: 1.1rem;
      font-weight: 700;
      margin-bottom: 20px;
    }

    .footer-links {
      list-style: none;
    }

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

    .footer-links a {
      color: #94a3b8;
      text-decoration: none;
      font-size: 0.9rem;
      transition: color 0.2s ease;
    }

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

    .friend-links-box {
      border-top: 1px solid #1e293b;
      padding-top: 24px;
      margin-bottom: 24px;
    }

    .friend-links-box h5 {
      color: #cbd5e1;
      font-size: 0.95rem;
      margin-bottom: 12px;
    }

    .friend-links-list {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
    }

    .friend-links-list a {
      color: #64748b;
      text-decoration: none;
      font-size: 0.85rem;
      transition: color 0.2s ease;
    }

    .friend-links-list a:hover {
      color: #a5b4fc;
    }

    .footer-bottom {
      text-align: center;
      font-size: 0.85rem;
      color: #64748b;
      border-top: 1px solid #1e293b;
      padding-top: 20px;
    }

    /* Responsive */
    @media (max-width: 1024px) {
      .hero-title {
        font-size: 2.3rem;
      }
      .grid-4 {
        grid-template-columns: repeat(2, 1fr);
      }
      .timeline {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 768px) {
      .mobile-toggle {
        display: block;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #ffffff;
        flex-direction: column;
        align-items: stretch;
        padding: 20px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-md);
      }
      .nav-links.active {
        display: flex;
      }
      .hero-title {
        font-size: 1.85rem;
      }
      .hero-desc {
        font-size: 1rem;
      }
      .hero-metrics {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3, .grid-2 {
        grid-template-columns: 1fr;
      }
      .timeline {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .form-wrapper {
        padding: 24px;
      }
    }