/* CSS RESET & VARIABLES */
    *, *::before, *::after {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    :root {
      --primary-color: #3b82f6;
      --primary-hover: #2563eb;
      --accent-color: #8b5cf6;
      --accent-neon: #ec4899;
      --warning-color: #f59e0b;
      --bg-main: #f8fafc;
      --bg-card: #ffffff;
      --bg-alt: #eff6ff;
      --text-main: #0f172a;
      --text-muted: #475569;
      --border-color: #cbd5e1;
      --border-strong: #94a3b8;
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --shadow-sm: 0 4px 6px -1px rgba(0,0,0,0.05);
      --shadow-md: 0 10px 25px -5px rgba(59,130,246,0.12);
      --shadow-hover: 0 20px 30px -10px rgba(139,92,246,0.2);
      --container-max: 1240px;
    }

    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;
    }

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

    /* TYPOGRAPHY & BUTTONS */
    h1, h2, h3, h4 {
      color: var(--text-main);
      font-weight: 700;
      line-height: 1.3;
    }
    .section-title {
      text-align: center;
      font-size: 2.2rem;
      margin-bottom: 12px;
      position: relative;
      display: inline-block;
    }
    .section-subtitle {
      text-align: center;
      color: var(--text-muted);
      font-size: 1.05rem;
      margin-bottom: 45px;
      max-width: 700px;
      margin-left: auto;
      margin-right: auto;
    }
    .title-wrapper {
      text-align: center;
      margin-bottom: 40px;
    }
    .badge {
      display: inline-block;
      padding: 6px 16px;
      background: linear-gradient(135deg, #eff6ff, #e0e7ff);
      color: var(--primary-hover);
      border: 1px solid #c7d2fe;
      border-radius: 50px;
      font-size: 0.88rem;
      font-weight: 600;
      margin-bottom: 12px;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 12px 28px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      font-size: 1rem;
      text-decoration: none;
      transition: all 0.3s ease;
      cursor: pointer;
      border: none;
      gap: 8px;
    }
    .btn-primary {
      background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
      color: #ffffff;
      box-shadow: 0 4px 14px rgba(59,130,246,0.35);
    }
    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 8px 20px rgba(139,92,246,0.45);
      color: #ffffff;
    }
    .btn-secondary {
      background: #ffffff;
      color: var(--text-main);
      border: 2px solid var(--border-color);
    }
    .btn-secondary:hover {
      border-color: var(--primary-color);
      color: var(--primary-color);
      background: var(--bg-alt);
    }
    .btn-contrast {
      background: linear-gradient(135deg, var(--accent-neon), #f43f5e);
      color: #ffffff;
      box-shadow: 0 4px 14px rgba(236,72,153,0.35);
    }
    .btn-contrast:hover {
      transform: translateY(-2px);
      box-shadow: 0 8px 22px rgba(244,63,94,0.45);
    }

    /* HEADER & NAV */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(10px);
      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;
    }
    .ai-page-logo {
      height: 42px;
      width: auto;
      object-fit: contain;
    }
    .logo-text {
      font-size: 1.4rem;
      font-weight: 800;
      background: linear-gradient(135deg, var(--primary-color), var(--accent-neon));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    
    /* NAV LINKS REQUIREMENT: gap set to 0 */
    .nav-links {
      display: flex;
      gap: 0;
      align-items: center;
      list-style: none;
    }
    .nav-links li a {
      display: block;
      padding: 10px 14px;
      color: var(--text-main);
      text-decoration: none;
      font-size: 0.95rem;
      font-weight: 500;
      transition: color 0.2s ease;
    }
    .nav-links li a:hover {
      color: var(--primary-color);
    }
    .ai-page-home-link {
      font-weight: 700;
      color: var(--primary-color) !important;
    }

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

    .mobile-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.5rem;
      cursor: pointer;
      color: var(--text-main);
      padding: 5px;
    }

    /* SECTION CONTAINERS */
    section {
      padding: 80px 0;
    }
    .section-alt {
      background-color: var(--bg-alt);
    }

    /* HERO SECTION (NO IMAGES ALLOWED) */
    #hero {
      padding: 90px 0 70px 0;
      background: radial-gradient(circle at 50% 20%, #eff6ff 0%, #f8fafc 70%);
      text-align: center;
      position: relative;
    }
    .hero-badge-group {
      display: flex;
      justify-content: center;
      gap: 12px;
      margin-bottom: 24px;
      flex-wrap: wrap;
    }
    .hero-badge {
      background: #ffffff;
      border: 1px solid var(--border-strong);
      padding: 6px 16px;
      border-radius: 30px;
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--text-main);
      box-shadow: 0 2px 5px rgba(0,0,0,0.05);
    }
    .hero-title {
      font-size: 3rem;
      line-height: 1.2;
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }
    .hero-title span {
      background: linear-gradient(135deg, var(--primary-color), var(--accent-color), var(--accent-neon));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .hero-desc {
      font-size: 1.2rem;
      color: var(--text-muted);
      max-width: 820px;
      margin: 0 auto 36px auto;
    }
    .hero-cta-group {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 16px;
      margin-bottom: 50px;
      flex-wrap: wrap;
    }
    .hero-metrics {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      margin-top: 30px;
    }
    .metric-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px 16px;
      box-shadow: var(--shadow-sm);
      transition: transform 0.3s ease;
    }
    .metric-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }
    .metric-val {
      font-size: 2.2rem;
      font-weight: 800;
      color: var(--primary-color);
      margin-bottom: 4px;
    }
    .metric-label {
      font-size: 0.9rem;
      color: var(--text-muted);
    }

    /* ABOUT / PLATFORM INTRO */
    .about-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
    }
    .about-content h3 {
      font-size: 1.8rem;
      margin-bottom: 16px;
    }
    .about-content p {
      color: var(--text-muted);
      margin-bottom: 20px;
      font-size: 1.05rem;
    }
    .feature-list {
      list-style: none;
      margin-bottom: 25px;
    }
    .feature-list li {
      margin-bottom: 12px;
      display: flex;
      align-items: flex-start;
      gap: 10px;
      font-weight: 500;
    }
    .feature-list li::before {
      content: "✓";
      color: var(--primary-color);
      font-weight: 900;
      background: #dbeafe;
      width: 22px;
      height: 22px;
      border-radius: 50%;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-size: 0.8rem;
      flex-shrink: 0;
      margin-top: 2px;
    }
    .about-card-box {
      background: #ffffff;
      border: 2px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 30px;
      box-shadow: var(--shadow-md);
    }
    .model-tag-cloud {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      margin-top: 20px;
    }
    .tag-item {
      background: #f1f5f9;
      border: 1px solid #cbd5e1;
      padding: 6px 14px;
      border-radius: 20px;
      font-size: 0.88rem;
      font-weight: 600;
      color: var(--text-main);
    }

    /* SERVICES & SCENARIOS CARDS */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .card-item {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px;
      transition: all 0.3s ease;
      display: flex;
      flex-direction: column;
    }
    .card-item:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-hover);
      border-color: var(--primary-color);
    }
    .card-icon {
      width: 50px;
      height: 50px;
      background: linear-gradient(135deg, #dbeafe, #e0e7ff);
      color: var(--primary-hover);
      border-radius: var(--radius-sm);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.5rem;
      font-weight: bold;
      margin-bottom: 20px;
    }
    .card-title {
      font-size: 1.25rem;
      margin-bottom: 10px;
    }
    .card-desc {
      color: var(--text-muted);
      font-size: 0.95rem;
      flex-grow: 1;
    }

    /* WORKFLOW & NETWORK */
    .workflow-steps {
      display: grid;
      grid-template-columns: repeat(7, 1fr);
      gap: 10px;
      margin-top: 30px;
    }
    .step-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      padding: 20px 10px;
      text-align: center;
      position: relative;
    }
    .step-num {
      width: 30px;
      height: 30px;
      background: var(--primary-color);
      color: #ffffff;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 12px auto;
      font-weight: 700;
      font-size: 0.9rem;
    }
    .step-title {
      font-size: 0.95rem;
      font-weight: 700;
      margin-bottom: 6px;
    }
    .step-desc {
      font-size: 0.8rem;
      color: var(--text-muted);
    }

    /* COMPARISON SECTION */
    .rating-banner {
      background: linear-gradient(135deg, #1e293b, #0f172a);
      color: #ffffff;
      border-radius: var(--radius-lg);
      padding: 30px 40px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: 40px;
      flex-wrap: wrap;
      gap: 20px;
    }
    .rating-info h3 {
      color: #ffffff;
      font-size: 1.6rem;
      margin-bottom: 8px;
    }
    .stars {
      color: #f59e0b;
      font-size: 1.4rem;
      letter-spacing: 2px;
    }
    .score-badge {
      font-size: 2.8rem;
      font-weight: 900;
      color: #38bdf8;
    }
    .score-badge span {
      font-size: 1.2rem;
      color: #94a3b8;
    }

    .table-container {
      overflow-x: auto;
      background: #ffffff;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }
    .comp-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 650px;
    }
    .comp-table th, .comp-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
    }
    .comp-table th {
      background: #f1f5f9;
      font-weight: 700;
      color: var(--text-main);
    }
    .comp-table tr:last-child td {
      border-bottom: none;
    }
    .highlight-cell {
      background: #eff6ff;
      font-weight: 700;
      color: var(--primary-hover);
    }

    /* CASE SHOWCASE WITH IMAGES */
    .case-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .case-card {
      background: #ffffff;
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }
    .case-img-box {
      width: 100%;
      height: 200px;
      overflow: hidden;
      background: #e2e8f0;
      display: flex;
      align-items: center;
      justify-content: center;
    }
    .case-img-box img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.4s ease;
    }
    .case-card:hover .case-img-box img {
      transform: scale(1.05);
    }
    .case-body {
      padding: 20px;
    }
    .case-tag {
      font-size: 0.8rem;
      color: var(--accent-color);
      font-weight: 700;
      text-transform: uppercase;
      margin-bottom: 6px;
    }
    .case-title {
      font-size: 1.1rem;
      margin-bottom: 8px;
    }
    .case-desc {
      font-size: 0.9rem;
      color: var(--text-muted);
    }

    /* REVIEWS SECTION */
    .reviews-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .review-card {
      background: #ffffff;
      border-radius: var(--radius-md);
      padding: 26px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .review-content {
      font-size: 0.95rem;
      color: var(--text-main);
      margin-bottom: 20px;
      font-style: italic;
    }
    .review-author {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .author-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--primary-color), var(--accent-neon));
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
    }
    .author-info h5 {
      font-size: 0.98rem;
      margin-bottom: 2px;
    }
    .author-info p {
      font-size: 0.82rem;
      color: var(--text-muted);
    }

    /* FORM & MATCH SECTION */
    .form-container {
      background: #ffffff;
      border-radius: var(--radius-lg);
      padding: 40px;
      border: 2px solid var(--border-color);
      box-shadow: var(--shadow-md);
      max-width: 800px;
      margin: 0 auto;
    }
    .form-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
    }
    .form-group {
      display: flex;
      flex-direction: column;
      gap: 8px;
    }
    .form-group.full-width {
      grid-column: span 2;
    }
    .form-group label {
      font-weight: 600;
      font-size: 0.95rem;
    }
    .form-control {
      padding: 12px 16px;
      border: 1px solid var(--border-strong);
      border-radius: var(--radius-sm);
      font-size: 0.98rem;
      outline: none;
      transition: border-color 0.2s;
    }
    .form-control:focus {
      border-color: var(--primary-color);
      box-shadow: 0 0 0 3px rgba(59,130,246,0.15);
    }

    /* FAQ ACCORDION */
    .faq-wrapper {
      max-width: 900px;
      margin: 0 auto;
    }
    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      margin-bottom: 12px;
      overflow: hidden;
    }
    .faq-question {
      padding: 18px 24px;
      font-weight: 700;
      font-size: 1.05rem;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      background: #ffffff;
      user-select: none;
    }
    .faq-question::after {
      content: "+";
      font-size: 1.4rem;
      color: var(--primary-color);
      transition: transform 0.3s ease;
    }
    .faq-item.active .faq-question::after {
      transform: rotate(45deg);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      background: #f8fafc;
      padding: 0 24px;
    }
    .faq-item.active .faq-answer {
      padding: 18px 24px;
      max-height: 300px;
      border-top: 1px solid var(--border-color);
    }

    /* ARTICLES & NEWS */
    .article-links-box {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      margin-top: 20px;
    }
    .article-list {
      list-style: none;
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 14px;
    }
    .article-list li a {
      color: var(--text-main);
      text-decoration: none;
      font-size: 0.95rem;
      display: flex;
      align-items: center;
      gap: 8px;
      transition: color 0.2s;
    }
    .article-list li a:hover {
      color: var(--primary-color);
    }
    .article-list li a::before {
      content: "•";
      color: var(--primary-color);
      font-size: 1.2rem;
    }

    /* FOOTER */
    .site-footer {
      background: #0f172a;
      color: #94a3b8;
      padding: 60px 0 30px 0;
      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;
      margin-bottom: 20px;
    }
    .footer-col p, .footer-col li {
      font-size: 0.9rem;
      line-height: 1.8;
    }
    .footer-links {
      list-style: none;
    }
    .footer-links li a {
      color: #94a3b8;
      text-decoration: none;
      transition: color 0.2s;
    }
    .footer-links li a:hover {
      color: #ffffff;
    }
    .friendship-links {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 15px;
    }
    .friendship-links a {
      color: #cbd5e1;
      text-decoration: none;
      font-size: 0.88rem;
      background: #1e293b;
      padding: 4px 10px;
      border-radius: 4px;
      transition: background 0.2s;
    }
    .friendship-links a:hover {
      background: var(--primary-color);
      color: #ffffff;
    }
    .qr-container {
      display: flex;
      align-items: center;
      gap: 15px;
      margin-top: 10px;
    }
    .qr-container img {
      width: 90px;
      height: 90px;
      border-radius: 8px;
      background: #ffffff;
      padding: 4px;
    }
    .footer-bottom {
      text-align: center;
      padding-top: 25px;
      border-top: 1px solid #1e293b;
      font-size: 0.85rem;
      color: #64748b;
    }

    /* FLOATING CUSTOMER WIDGET */
    .floating-kefu {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .kefu-btn {
      width: 52px;
      height: 52px;
      background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
      color: #ffffff;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 4px 12px rgba(0,0,0,0.25);
      cursor: pointer;
      text-decoration: none;
      font-size: 1.2rem;
      position: relative;
    }
    .kefu-btn:hover .kefu-popover {
      display: block;
    }
    .kefu-popover {
      display: none;
      position: absolute;
      right: 65px;
      bottom: 0;
      background: #ffffff;
      border-radius: var(--radius-md);
      padding: 15px;
      box-shadow: var(--shadow-hover);
      border: 1px solid var(--border-color);
      text-align: center;
      width: 160px;
      color: var(--text-main);
    }
    .kefu-popover img {
      width: 120px;
      height: 120px;
      margin-bottom: 6px;
    }
    .kefu-popover p {
      font-size: 0.8rem;
      color: var(--text-muted);
    }

    /* RESPONSIVE DESIGN */
    @media (max-width: 1024px) {
      .hero-metrics { grid-template-columns: repeat(2, 1fr); }
      .grid-4 { grid-template-columns: repeat(2, 1fr); }
      .workflow-steps { grid-template-columns: repeat(4, 1fr); }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }

    @media (max-width: 768px) {
      .hero-title { font-size: 2.1rem; }
      .mobile-toggle { display: block; }
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #ffffff;
        flex-direction: column;
        padding: 20px 0;
        box-shadow: var(--shadow-md);
        border-bottom: 1px solid var(--border-color);
      }
      .nav-links.active { display: flex; }
      .about-grid, .grid-3, .case-grid, .reviews-grid { grid-template-columns: 1fr; }
      .workflow-steps { grid-template-columns: repeat(2, 1fr); }
      .form-grid { grid-template-columns: 1fr; }
      .form-group.full-width { grid-column: span 1; }
      .article-list { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
      .rating-banner { flex-direction: column; text-align: center; }
    }