:root {
      --bg-main: #f8fafc;
      --bg-card: #ffffff;
      --bg-card-alt: #f1f5f9;
      --text-main: #0f172a;
      --text-muted: #475569;
      --text-light: #64748b;
      --primary: #4f46e5;
      --primary-hover: #4338ca;
      --neon-cyan: #06b6d4;
      --neon-pink: #ec4899;
      --neon-purple: #8b5cf6;
      --neon-glow: 0 0 20px rgba(6, 182, 212, 0.25), 0 0 40px rgba(79, 70, 229, 0.15);
      --border-color: #e2e8f0;
      --border-glow: rgba(99, 102, 241, 0.2);
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 22px;
      --shadow-sm: 0 2px 4px rgba(15, 23, 42, 0.04);
      --shadow-md: 0 8px 24px rgba(15, 23, 42, 0.06);
      --shadow-lg: 0 16px 36px rgba(79, 70, 229, 0.08);
      --container-max: 1200px;
    }

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

    html {
      scroll-behavior: smooth;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-main);
      color: var(--text-main);
      line-height: 1.6;
    }

    body {
      overflow-x: hidden;
      background: radial-gradient(circle at 15% 10%, 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(236, 72, 153, 0.05) 0%, transparent 50%),
                  var(--bg-main);
    }

    a {
      color: inherit;
      text-decoration: none;
      transition: all 0.25s ease;
    }

    img {
      max-width: 100%;
      height: auto;
      display: block;
    }

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

    /* Top Navigation */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: 0 4px 20px rgba(0, 0, 0, 0.03);
    }

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

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

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

    .brand-title {
      font-size: 20px;
      font-weight: 800;
      background: linear-gradient(135deg, var(--primary) 0%, var(--neon-cyan) 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      letter-spacing: -0.5px;
    }

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

    .nav-links li a {
      display: inline-block;
      padding: 8px 14px;
      font-size: 14px;
      font-weight: 500;
      color: var(--text-muted);
      border-radius: var(--radius-sm);
    }

    .nav-links li a:hover {
      color: var(--primary);
      background: rgba(79, 70, 229, 0.06);
    }

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

    .btn-neon-glow {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      font-size: 14px;
      font-weight: 600;
      color: #ffffff;
      background: linear-gradient(135deg, var(--primary) 0%, var(--neon-cyan) 100%);
      border-radius: 999px;
      box-shadow: 0 4px 15px rgba(79, 70, 229, 0.3);
      transition: transform 0.2s, box-shadow 0.2s;
      border: none;
      cursor: pointer;
    }

    .btn-neon-glow:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(6, 182, 212, 0.4);
      color: #ffffff;
    }

    .btn-outline-neon {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 9px 20px;
      font-size: 14px;
      font-weight: 600;
      color: var(--primary);
      background: #ffffff;
      border: 1px solid rgba(79, 70, 229, 0.3);
      border-radius: 999px;
      transition: all 0.2s;
    }

    .btn-outline-neon:hover {
      border-color: var(--primary);
      background: rgba(79, 70, 229, 0.05);
    }

    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      color: var(--text-main);
      cursor: pointer;
      padding: 4px;
    }

    /* Section Global Headers */
    .section-padding {
      padding: 80px 0;
    }

    .section-header {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 50px auto;
    }

    .section-badge {
      display: inline-block;
      padding: 4px 14px;
      font-size: 12px;
      font-weight: 700;
      letter-spacing: 1px;
      text-transform: uppercase;
      color: var(--primary);
      background: rgba(79, 70, 229, 0.1);
      border: 1px solid rgba(79, 70, 229, 0.2);
      border-radius: 999px;
      margin-bottom: 12px;
    }

    .section-title {
      font-size: 32px;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 14px;
      letter-spacing: -0.5px;
    }

    .section-subtitle {
      font-size: 16px;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* HERO SECTION (NO IMAGES PER RULE) */
    .hero-section {
      padding: 90px 0 70px 0;
      position: relative;
      text-align: center;
    }

    .hero-pill {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 18px;
      background: #ffffff;
      border: 1px solid rgba(6, 182, 212, 0.3);
      border-radius: 999px;
      box-shadow: 0 4px 15px rgba(6, 182, 212, 0.12);
      margin-bottom: 24px;
      font-size: 13px;
      font-weight: 600;
      color: var(--primary);
    }

    .hero-pill-dot {
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: #10b981;
      box-shadow: 0 0 10px #10b981;
    }

    .hero-h1 {
      font-size: 44px;
      font-weight: 900;
      line-height: 1.25;
      color: var(--text-main);
      margin-bottom: 20px;
      letter-spacing: -1px;
    }

    .hero-h1 span {
      background: linear-gradient(135deg, #4f46e5 0%, #06b6d4 50%, #ec4899 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-desc {
      font-size: 18px;
      color: var(--text-muted);
      max-width: 800px;
      margin: 0 auto 36px auto;
      line-height: 1.7;
    }

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

    .hero-cta-main {
      padding: 14px 34px;
      font-size: 16px;
      font-weight: 700;
    }

    .hero-stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 18px;
      margin-top: 40px;
    }

    .stat-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px 16px;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s;
      position: relative;
      overflow: hidden;
    }

    .stat-card::before {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      height: 3px;
      background: linear-gradient(90deg, var(--neon-cyan), var(--primary), var(--neon-pink));
      opacity: 0;
      transition: opacity 0.3s;
    }

    .stat-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: rgba(99, 102, 241, 0.3);
    }

    .stat-card:hover::before {
      opacity: 1;
    }

    .stat-number {
      font-size: 32px;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 4px;
    }

    .stat-label {
      font-size: 13px;
      color: var(--text-muted);
      font-weight: 500;
    }

    /* Model Chip Cloud */
    .model-tags-wrapper {
      margin-top: 30px;
      padding: 20px;
      background: #ffffff;
      border-radius: var(--radius-md);
      border: 1px dashed rgba(79, 70, 229, 0.25);
    }

    .model-tags-title {
      font-size: 13px;
      font-weight: 700;
      color: var(--text-light);
      text-transform: uppercase;
      letter-spacing: 1px;
      margin-bottom: 14px;
    }

    .model-chips {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 8px;
    }

    .model-chip {
      display: inline-block;
      padding: 5px 12px;
      font-size: 12px;
      font-weight: 600;
      color: var(--text-muted);
      background: var(--bg-card-alt);
      border: 1px solid var(--border-color);
      border-radius: 6px;
      transition: all 0.2s;
    }

    .model-chip:hover {
      color: var(--primary);
      border-color: var(--primary);
      background: #ffffff;
      box-shadow: 0 2px 8px rgba(79, 70, 229, 0.15);
    }

    /* Service Cards Grid */
    .cards-grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

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

    .feature-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
      display: flex;
      flex-direction: column;
      height: 100%;
    }

    .feature-card:hover {
      transform: translateY(-5px);
      box-shadow: 0 12px 30px rgba(79, 70, 229, 0.1);
      border-color: rgba(6, 182, 212, 0.4);
    }

    .feature-icon-badge {
      width: 48px;
      height: 48px;
      border-radius: 12px;
      background: linear-gradient(135deg, rgba(79, 70, 229, 0.1) 0%, rgba(6, 182, 212, 0.15) 100%);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 22px;
      font-weight: 800;
      margin-bottom: 20px;
    }

    .feature-card h3 {
      font-size: 18px;
      font-weight: 700;
      margin-bottom: 10px;
      color: var(--text-main);
    }

    .feature-card p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
      flex-grow: 1;
    }

    .feature-tag {
      margin-top: 16px;
      display: inline-block;
      font-size: 12px;
      font-weight: 600;
      color: var(--neon-cyan);
    }

    /* Workflow Steps */
    .workflow-timeline {
      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: 26px;
      position: relative;
      box-shadow: var(--shadow-sm);
    }

    .step-number {
      font-size: 28px;
      font-weight: 900;
      color: rgba(79, 70, 229, 0.2);
      margin-bottom: 12px;
    }

    .step-card h3 {
      font-size: 17px;
      font-weight: 700;
      margin-bottom: 8px;
      color: var(--text-main);
    }

    .step-card p {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* Comparison Table & Rating */
    .eval-highlight-box {
      background: linear-gradient(135deg, #ffffff 0%, #f8faff 100%);
      border: 1px solid rgba(79, 70, 229, 0.2);
      border-radius: var(--radius-lg);
      padding: 34px;
      box-shadow: var(--shadow-md);
      margin-bottom: 30px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 20px;
    }

    .eval-score-wrap {
      display: flex;
      align-items: center;
      gap: 20px;
    }

    .eval-big-num {
      font-size: 48px;
      font-weight: 900;
      color: var(--primary);
      line-height: 1;
    }

    .eval-stars {
      color: #f59e0b;
      font-size: 20px;
      margin-bottom: 4px;
    }

    .eval-label {
      font-size: 14px;
      color: var(--text-muted);
      font-weight: 600;
    }

    .table-container {
      width: 100%;
      overflow-x: auto;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
    }

    .custom-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      font-size: 14px;
    }

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

    .custom-table th {
      background: var(--bg-card-alt);
      font-weight: 700;
      color: var(--text-main);
    }

    .custom-table tr:hover td {
      background: rgba(79, 70, 229, 0.02);
    }

    .tag-badge-pro {
      display: inline-block;
      padding: 3px 8px;
      font-size: 12px;
      font-weight: 700;
      color: #059669;
      background: #d1fae5;
      border-radius: 4px;
    }

    /* Gallery / Banners */
    .gallery-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 20px;
      margin-bottom: 24px;
    }

    .gallery-item {
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      background: #ffffff;
      transition: transform 0.3s;
    }

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

    .gallery-item img {
      width: 100%;
      height: 240px;
      object-fit: cover;
    }

    .gallery-caption {
      padding: 14px 18px;
      font-size: 14px;
      font-weight: 600;
      color: var(--text-main);
      background: #ffffff;
    }

    /* Reviews Grid */
    .reviews-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 22px;
    }

    .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;
    }

    .review-quote {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 18px;
    }

    .review-user {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid var(--border-color);
      padding-top: 14px;
    }

    .review-avatar {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--primary), var(--neon-cyan));
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 14px;
    }

    .review-meta h4 {
      font-size: 14px;
      font-weight: 700;
      color: var(--text-main);
    }

    .review-meta p {
      font-size: 12px;
      color: var(--text-light);
    }

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

    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: border-color 0.2s;
    }

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

    .faq-question {
      padding: 18px 24px;
      font-size: 16px;
      font-weight: 700;
      color: var(--text-main);
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: space-between;
      user-select: none;
    }

    .faq-question:hover {
      color: var(--primary);
    }

    .faq-icon {
      font-size: 18px;
      font-weight: 400;
      transition: transform 0.25s;
    }

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

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      background: #fafcff;
    }

    .faq-answer-inner {
      padding: 0 24px 20px 24px;
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* 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-panel h3 {
      font-size: 24px;
      font-weight: 800;
      margin-bottom: 14px;
      color: var(--text-main);
    }

    .contact-info-panel p {
      font-size: 14px;
      color: var(--text-muted);
      margin-bottom: 24px;
      line-height: 1.6;
    }

    .contact-details-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 14px;
      margin-bottom: 24px;
    }

    .contact-details-list li {
      font-size: 14px;
      color: var(--text-main);
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .contact-details-list li strong {
      color: var(--primary);
      min-width: 70px;
    }

    .qr-box {
      display: flex;
      align-items: center;
      gap: 16px;
      padding: 16px;
      background: var(--bg-card-alt);
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      max-width: 320px;
    }

    .qr-box img {
      width: 80px;
      height: 80px;
      border-radius: 6px;
      object-fit: cover;
    }

    .qr-text h4 {
      font-size: 14px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 4px;
    }

    .qr-text p {
      font-size: 12px;
      color: var(--text-muted);
      margin-bottom: 0;
    }

    .contact-form {
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

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

    .form-group label {
      font-size: 13px;
      font-weight: 600;
      color: var(--text-main);
    }

    .form-control {
      width: 100%;
      padding: 12px 14px;
      font-size: 14px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      background: #ffffff;
      color: var(--text-main);
      outline: none;
      transition: border-color 0.2s, box-shadow 0.2s;
    }

    .form-control:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
    }

    textarea.form-control {
      resize: vertical;
      min-height: 100px;
    }

    /* Articles / Knowledge Section */
    .articles-box {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      margin-top: 20px;
    }

    .articles-links-list {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 14px;
      list-style: none;
    }

    .articles-links-list li a {
      display: inline-block;
      padding: 6px 14px;
      font-size: 13px;
      color: var(--text-muted);
      background: var(--bg-card-alt);
      border-radius: 6px;
      border: 1px solid var(--border-color);
    }

    .articles-links-list li a:hover {
      color: var(--primary);
      border-color: var(--primary);
      background: #ffffff;
    }

    /* Footer Styles */
    .site-footer {
      background: #ffffff;
      border-top: 1px solid var(--border-color);
      padding: 50px 0 30px 0;
      margin-top: 60px;
    }

    .footer-inner {
      display: flex;
      justify-content: space-between;
      align-items: flex-start;
      flex-wrap: wrap;
      gap: 30px;
      margin-bottom: 30px;
    }

    .footer-brand {
      max-width: 360px;
    }

    .footer-brand p {
      font-size: 13px;
      color: var(--text-muted);
      margin-top: 12px;
      line-height: 1.6;
    }

    .footer-links-group h4 {
      font-size: 14px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 12px;
    }

    .footer-links-group .friend-links-wrap {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
    }

    .friend-links-wrap a {
      font-size: 13px;
      color: var(--text-muted);
      padding: 4px 8px;
      border-radius: 4px;
      background: var(--bg-card-alt);
    }

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

    .footer-bottom {
      border-top: 1px solid var(--border-color);
      padding-top: 20px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 12px;
      font-size: 13px;
      color: var(--text-light);
    }

    /* Floating Utilities */
    .floating-bar {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 99;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .float-btn {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: #ffffff;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-md);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 16px;
      color: var(--primary);
      cursor: pointer;
      transition: all 0.2s;
    }

    .float-btn:hover {
      background: var(--primary);
      color: #ffffff;
      transform: translateY(-3px);
    }

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

    @media (max-width: 768px) {
      .mobile-menu-btn {
        display: block;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #ffffff;
        flex-direction: column;
        padding: 16px 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 {
        width: 100%;
        padding: 10px 0;
      }
      .nav-actions .btn-outline-neon {
        display: none;
      }
      .hero-h1 {
        font-size: 30px;
      }
      .hero-desc {
        font-size: 15px;
      }
      .cards-grid-3, .cards-grid-4, .workflow-timeline, .reviews-grid, .gallery-grid {
        grid-template-columns: 1fr;
      }
      .contact-wrapper {
        grid-template-columns: 1fr;
        padding: 24px;
      }
      .eval-highlight-box {
        flex-direction: column;
        align-items: flex-start;
      }
    }