:root {
      --bg-main: #f8fafc;
      --bg-card: #ffffff;
      --text-main: #0f172a;
      --text-muted: #475569;
      --text-light: #64748b;
      --primary: #0284c7;
      --primary-hover: #0369a1;
      --neon-cyan: #06b6d4;
      --neon-green: #10b981;
      --neon-purple: #8b5cf6;
      --neon-pink: #ec4899;
      --border-color: #e2e8f0;
      --border-glow: rgba(6, 182, 212, 0.3);
      --card-shadow: 0 10px 25px -5px rgba(15, 23, 42, 0.05), 0 8px 10px -6px rgba(15, 23, 42, 0.05);
      --glow-shadow: 0 0 20px rgba(6, 182, 212, 0.15);
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-lg: 20px;
      --radius-full: 9999px;
      --transition: all 0.28s cubic-bezier(0.4, 0, 0.2, 1);
    }

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
      -webkit-tap-highlight-color: transparent;
    }

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
      background-color: var(--bg-main);
      color: var(--text-main);
      line-height: 1.6;
      overflow-x: hidden;
      background-image: 
        radial-gradient(circle at 15% 15%, rgba(6, 182, 212, 0.08) 0%, transparent 40%),
        radial-gradient(circle at 85% 30%, rgba(139, 92, 246, 0.08) 0%, transparent 45%),
        radial-gradient(circle at 50% 80%, rgba(16, 185, 129, 0.06) 0%, transparent 50%);
      background-attachment: fixed;
    }

    a {
      color: inherit;
      text-decoration: none;
      transition: var(--transition);
    }

    .container {
      width: 100%;
      max-width: 1240px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* Header */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.88);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: 0 2px 10px rgba(0, 0, 0, 0.02);
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 76px;
    }

    .brand-logo-wrapper {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .brand-logo-wrapper img.ai-page-logo {
      height: 42px;
      width: auto;
      display: block;
    }

    .brand-name-sub {
      font-size: 18px;
      font-weight: 700;
      background: linear-gradient(135deg, #0f172a, #0284c7);
      -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 li a {
      padding: 8px 14px;
      font-size: 14.5px;
      font-weight: 500;
      color: var(--text-muted);
      border-radius: var(--radius-sm);
      position: relative;
    }

    .nav-links li a:hover,
    .nav-links li a.active {
      color: var(--primary);
      background: rgba(2, 132, 199, 0.06);
    }

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

    .btn-nav-portal {
      display: inline-flex;
      align-items: center;
      padding: 9px 20px;
      background: linear-gradient(135deg, #0284c7, #06b6d4);
      color: #ffffff !important;
      font-size: 14px;
      font-weight: 600;
      border-radius: var(--radius-full);
      box-shadow: 0 4px 14px rgba(6, 182, 212, 0.35);
      border: 1px solid rgba(255, 255, 255, 0.4);
    }

    .btn-nav-portal:hover {
      transform: translateY(-1px);
      box-shadow: 0 6px 20px rgba(6, 182, 212, 0.45);
    }

    .mobile-menu-btn {
      display: none;
      background: transparent;
      border: none;
      cursor: pointer;
      padding: 8px;
    }

    .mobile-menu-btn span {
      display: block;
      width: 24px;
      height: 2px;
      background-color: var(--text-main);
      margin: 5px 0;
      transition: var(--transition);
    }

    /* Hero Section (No Image Strictly) */
    .hero-section {
      padding: 70px 0 60px;
      text-align: center;
      position: relative;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 16px;
      background: rgba(6, 182, 212, 0.1);
      border: 1px solid var(--border-glow);
      border-radius: var(--radius-full);
      color: #0891b2;
      font-size: 13.5px;
      font-weight: 600;
      margin-bottom: 24px;
      animation: pulseGlow 3s infinite;
    }

    .hero-badge .dot {
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: var(--neon-cyan);
      box-shadow: 0 0 10px var(--neon-cyan);
    }

    .hero-title {
      font-size: 42px;
      font-weight: 800;
      line-height: 1.25;
      margin-bottom: 20px;
      color: var(--text-main);
      letter-spacing: -0.8px;
    }

    .hero-title .glow-highlight {
      background: linear-gradient(135deg, #0284c7 0%, #06b6d4 50%, #8b5cf6 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      position: relative;
      display: inline-block;
    }

    .hero-subtitle {
      max-width: 820px;
      margin: 0 auto 36px;
      font-size: 18px;
      color: var(--text-muted);
      line-height: 1.68;
    }

    .hero-cta-group {
      display: flex;
      justify-content: center;
      align-items: center;
      flex-wrap: wrap;
      gap: 16px;
      margin-bottom: 50px;
    }

    .btn-hero-primary {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 10px;
      padding: 15px 36px;
      font-size: 16px;
      font-weight: 700;
      color: #ffffff !important;
      background: linear-gradient(135deg, #0284c7, #06b6d4, #10b981);
      background-size: 200% auto;
      border-radius: var(--radius-full);
      box-shadow: 0 10px 25px rgba(6, 182, 212, 0.4);
      border: 1px solid rgba(255, 255, 255, 0.4);
      animation: gradientShift 4s ease infinite;
    }

    .btn-hero-primary:hover {
      transform: translateY(-2px) scale(1.02);
      box-shadow: 0 14px 30px rgba(6, 182, 212, 0.55);
    }

    .btn-hero-secondary {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 15px 32px;
      font-size: 16px;
      font-weight: 600;
      color: var(--text-main);
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-full);
      box-shadow: var(--card-shadow);
    }

    .btn-hero-secondary:hover {
      border-color: var(--neon-cyan);
      color: var(--primary);
      transform: translateY(-2px);
    }

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

    .hero-metric-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px 16px;
      box-shadow: var(--card-shadow);
      position: relative;
      overflow: hidden;
      transition: var(--transition);
    }

    .hero-metric-card::before {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      height: 3px;
      background: linear-gradient(90deg, var(--neon-cyan), var(--neon-green));
      opacity: 0;
      transition: var(--transition);
    }

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

    .hero-metric-card:hover::before {
      opacity: 1;
    }

    .metric-num {
      font-size: 32px;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 4px;
    }

    .metric-num span {
      font-size: 18px;
      color: var(--primary);
    }

    .metric-label {
      font-size: 13.5px;
      color: var(--text-light);
      font-weight: 500;
    }

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

    .section-head {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 48px;
    }

    .section-tag {
      display: inline-block;
      font-size: 12.5px;
      font-weight: 700;
      color: var(--primary);
      text-transform: uppercase;
      letter-spacing: 1.2px;
      background: rgba(2, 132, 199, 0.08);
      padding: 4px 14px;
      border-radius: var(--radius-full);
      margin-bottom: 12px;
      border: 1px solid rgba(2, 132, 199, 0.15);
    }

    .section-title {
      font-size: 30px;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 14px;
      letter-spacing: -0.4px;
    }

    .section-desc {
      font-size: 15.5px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* Tag Cloud & Model Matrix */
    .model-pills-wrap {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 10px;
      margin-top: 24px;
    }

    .model-pill {
      background: #ffffff;
      border: 1px solid var(--border-color);
      padding: 8px 16px;
      border-radius: var(--radius-full);
      font-size: 13.5px;
      font-weight: 600;
      color: var(--text-main);
      box-shadow: 0 2px 6px rgba(0, 0, 0, 0.03);
      transition: var(--transition);
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }

    .model-pill:hover {
      border-color: var(--neon-cyan);
      color: var(--primary);
      transform: translateY(-2px);
      box-shadow: 0 4px 12px rgba(6, 182, 212, 0.2);
    }

    /* Cards Grid */
    .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;
    }

    .feature-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px;
      box-shadow: var(--card-shadow);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
      height: 100%;
    }

    .feature-card:hover {
      transform: translateY(-5px);
      border-color: var(--border-glow);
      box-shadow: var(--glow-shadow);
    }

    .card-icon-box {
      width: 48px;
      height: 48px;
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 22px;
      margin-bottom: 20px;
      background: linear-gradient(135deg, rgba(6, 182, 212, 0.12), rgba(139, 92, 246, 0.12));
      color: var(--primary);
      border: 1px solid rgba(6, 182, 212, 0.2);
    }

    .feature-card h3 {
      font-size: 19px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 12px;
    }

    .feature-card p {
      font-size: 14.5px;
      color: var(--text-muted);
      line-height: 1.65;
      flex-grow: 1;
    }

    /* Workflow Cards */
    .workflow-step-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 26px 20px;
      position: relative;
      box-shadow: var(--card-shadow);
    }

    .step-number {
      font-size: 12px;
      font-weight: 800;
      padding: 4px 10px;
      border-radius: var(--radius-full);
      background: linear-gradient(135deg, var(--neon-cyan), var(--primary));
      color: #ffffff;
      display: inline-block;
      margin-bottom: 14px;
    }

    /* Responsive Images Section */
    .media-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--card-shadow);
      transition: var(--transition);
    }

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

    .media-img-wrapper {
      width: 100%;
      background: #f1f5f9;
      overflow: hidden;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .media-img-wrapper img {
      width: 100%;
      height: auto;
      object-fit: contain;
      display: block;
    }

    .media-info {
      padding: 20px;
    }

    .media-info h4 {
      font-size: 17px;
      font-weight: 700;
      margin-bottom: 6px;
      color: var(--text-main);
    }

    .media-info p {
      font-size: 13.5px;
      color: var(--text-muted);
    }

    /* Evaluation Section */
    .eval-box {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 36px;
      box-shadow: var(--card-shadow);
    }

    .eval-header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 20px;
      padding-bottom: 24px;
      border-bottom: 1px solid var(--border-color);
      margin-bottom: 28px;
    }

    .eval-score-badge {
      display: flex;
      align-items: center;
      gap: 16px;
      background: linear-gradient(135deg, rgba(6, 182, 212, 0.08), rgba(16, 185, 129, 0.08));
      padding: 12px 24px;
      border-radius: var(--radius-full);
      border: 1px solid rgba(6, 182, 212, 0.3);
    }

    .eval-stars {
      color: #f59e0b;
      font-size: 18px;
      letter-spacing: 2px;
    }

    .eval-score-num {
      font-size: 26px;
      font-weight: 800;
      color: #0891b2;
    }

    .eval-table-container {
      width: 100%;
      overflow-x: auto;
    }

    .eval-table {
      width: 100%;
      border-collapse: collapse;
      min-width: 640px;
    }

    .eval-table th,
    .eval-table td {
      padding: 16px 20px;
      text-align: left;
      border-bottom: 1px solid var(--border-color);
      font-size: 14.5px;
    }

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

    .eval-table td.highlight-col {
      background: rgba(6, 182, 212, 0.04);
      font-weight: 600;
      color: #0284c7;
    }

    /* Reviews Section */
    .review-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--card-shadow);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .review-quote {
      font-size: 14.5px;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 18px;
      font-style: italic;
    }

    .review-author {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .review-avatar {
      width: 42px;
      height: 42px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--neon-cyan), var(--neon-purple));
      display: flex;
      align-items: center;
      justify-content: center;
      color: #ffffff;
      font-weight: 700;
      font-size: 15px;
    }

    .review-info h5 {
      font-size: 15px;
      font-weight: 700;
      color: var(--text-main);
    }

    .review-info span {
      font-size: 12.5px;
      color: var(--text-light);
    }

    /* FAQ Accordion */
    .faq-wrapper {
      max-width: 920px;
      margin: 0 auto;
    }

    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      margin-bottom: 14px;
      overflow: hidden;
      box-shadow: 0 2px 6px rgba(0, 0, 0, 0.02);
      transition: var(--transition);
    }

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

    .faq-question {
      padding: 20px 24px;
      font-size: 16px;
      font-weight: 600;
      color: var(--text-main);
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      user-select: none;
    }

    .faq-icon {
      font-size: 18px;
      color: var(--primary);
      transition: var(--transition);
    }

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

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease-out;
      background: #fafbfc;
      border-top: 1px solid transparent;
    }

    .faq-item.active .faq-answer {
      border-top-color: var(--border-color);
    }

    .faq-answer p {
      padding: 18px 24px;
      font-size: 14.5px;
      color: var(--text-muted);
      line-height: 1.7;
    }

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

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

    .form-label {
      display: block;
      font-size: 14px;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 8px;
    }

    .form-input,
    .form-select,
    .form-textarea {
      width: 100%;
      padding: 13px 16px;
      background: #f8fafc;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      font-size: 14.5px;
      color: var(--text-main);
      outline: none;
      transition: var(--transition);
    }

    .form-input:focus,
    .form-select:focus,
    .form-textarea:focus {
      background: #ffffff;
      border-color: var(--neon-cyan);
      box-shadow: 0 0 0 3px rgba(6, 182, 212, 0.15);
    }

    .btn-form-submit {
      width: 100%;
      padding: 14px;
      background: linear-gradient(135deg, #0284c7, #06b6d4);
      color: #ffffff;
      border: none;
      border-radius: var(--radius-sm);
      font-size: 16px;
      font-weight: 700;
      cursor: pointer;
      box-shadow: 0 4px 14px rgba(6, 182, 212, 0.35);
      transition: var(--transition);
    }

    .btn-form-submit:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(6, 182, 212, 0.5);
    }

    /* Articles & Links Box */
    .article-links-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--card-shadow);
    }

    .article-list {
      list-style: none;
    }

    .article-list li {
      padding: 10px 0;
      border-bottom: 1px dashed var(--border-color);
    }

    .article-list li:last-child {
      border-bottom: none;
    }

    .article-list a {
      color: var(--text-main);
      font-size: 14px;
      display: inline-block;
      transition: var(--transition);
    }

    .article-list a:hover {
      color: var(--primary);
      padding-left: 6px;
    }

    /* Footer */
    .site-footer {
      background: #0f172a;
      color: #f1f5f9;
      padding: 60px 0 30px;
      border-top: 1px solid #1e293b;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 36px;
      margin-bottom: 40px;
    }

    .footer-col h4 {
      font-size: 16px;
      font-weight: 700;
      color: #ffffff;
      margin-bottom: 18px;
    }

    .footer-col p {
      font-size: 13.5px;
      color: #94a3b8;
      line-height: 1.68;
      margin-bottom: 12px;
    }

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

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

    .footer-links-list a {
      font-size: 13.5px;
      color: #94a3b8;
    }

    .footer-links-list a:hover {
      color: var(--neon-cyan);
    }

    .qr-box-inner {
      display: flex;
      flex-direction: column;
      align-items: flex-start;
      gap: 10px;
    }

    .qr-box-inner img {
      width: 100px;
      height: 100px;
      border-radius: var(--radius-sm);
      background: #ffffff;
      padding: 4px;
      display: block;
    }

    .friend-links-wrap {
      padding-top: 24px;
      border-top: 1px solid #1e293b;
      margin-bottom: 24px;
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      align-items: center;
    }

    .friend-links-wrap span {
      font-size: 13px;
      color: #64748b;
      font-weight: 600;
    }

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

    .friend-links-wrap a:hover {
      color: var(--neon-cyan);
    }

    .footer-bottom-copy {
      text-align: center;
      font-size: 13px;
      color: #64748b;
      padding-top: 20px;
      border-top: 1px solid #1e293b;
    }

    /* Floating Customer Bubble & Back to top */
    .floating-tools {
      position: fixed;
      right: 24px;
      bottom: 30px;
      display: flex;
      flex-direction: column;
      gap: 12px;
      z-index: 990;
    }

    .float-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: #ffffff;
      border: 1px solid var(--border-color);
      box-shadow: 0 6px 16px rgba(0, 0, 0, 0.12);
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      color: var(--text-main);
      font-size: 18px;
      transition: var(--transition);
    }

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

    /* Keyframes */
    @keyframes pulseGlow {
      0%, 100% { box-shadow: 0 0 10px rgba(6, 182, 212, 0.15); }
      50% { box-shadow: 0 0 20px rgba(6, 182, 212, 0.35); }
    }

    @keyframes gradientShift {
      0% { background-position: 0% 50%; }
      50% { background-position: 100% 50%; }
      100% { background-position: 0% 50%; }
    }

    /* Responsive */
    @media (max-width: 1024px) {
      .hero-metrics-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-4 {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 768px) {
      .mobile-menu-btn {
        display: block;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 76px;
        left: 0;
        right: 0;
        background: #ffffff;
        flex-direction: column;
        padding: 20px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: 0 10px 20px rgba(0, 0, 0, 0.05);
      }
      .nav-links.show {
        display: flex;
      }
      .nav-links li {
        width: 100%;
      }
      .nav-links li a {
        display: block;
        padding: 12px 16px;
      }
      .hero-title {
        font-size: 28px;
      }
      .hero-subtitle {
        font-size: 15px;
      }
      .grid-3, .grid-4, .grid-2 {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .form-wrapper-box {
        padding: 24px 16px;
      }
    }