:root {
      --bg-main: #f8fafc;
      --bg-card: #ffffff;
      --text-main: #0f172a;
      --text-muted: #475569;
      --neon-cyan: #06b6d4;
      --neon-pink: #ec4899;
      --neon-purple: #8b5cf6;
      --neon-lime: #10b981;
      --neon-grad: linear-gradient(135deg, #06b6d4 0%, #8b5cf6 50%, #ec4899 100%);
      --neon-glow: 0 4px 20px rgba(6, 182, 212, 0.25), 0 1px 3px rgba(139, 92, 246, 0.2);
      --border-light: rgba(139, 92, 246, 0.2);
      --border-radius: 12px;
    }

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

    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }

    body {
      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;
      overflow-x: hidden;
      display: flex;
      flex-direction: column;
      align-items: center;
      min-height: 100vh;
    }

    .container {
      width: 100%;
      max-width: 1200px;
      padding: 0 20px;
      margin: 0 auto;
    }

    header {
      width: 100%;
      background: rgba(255, 255, 255, 0.94);
      backdrop-filter: blur(12px);
      position: sticky;
      top: 0;
      z-index: 1000;
      border-bottom: 2px solid transparent;
      border-image: var(--neon-grad) 1;
    }

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

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

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

    .brand-title {
      font-size: 1.25rem;
      font-weight: 800;
      color: var(--text-main);
      letter-spacing: -0.5px;
    }

    .nav-menu {
      display: flex;
      align-items: center;
    }

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

    .nav-links li {
      display: inline-block;
    }

    .nav-links a {
      text-decoration: none;
      color: var(--text-main);
      font-weight: 600;
      font-size: 0.95rem;
      padding: 10px 14px;
      border-radius: 8px;
      transition: all 0.25s ease;
      display: block;
    }

    .nav-links a:hover {
      color: #7c3aed;
      background: rgba(139, 92, 246, 0.08);
      box-shadow: 0 0 10px rgba(6, 182, 212, 0.2);
    }

    .nav-cta {
      display: inline-flex;
      align-items: center;
      padding: 9px 20px;
      border-radius: 9999px;
      background: var(--neon-grad);
      color: #ffffff !important;
      font-weight: 700;
      text-decoration: none;
      box-shadow: 0 2px 10px rgba(6, 182, 212, 0.35);
      transition: transform 0.2s ease, box-shadow 0.2s ease;
      margin-left: 12px;
    }

    .nav-cta:hover {
      transform: translateY(-2px);
      box-shadow: 0 4px 18px rgba(236, 72, 153, 0.4);
    }

    .nav-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.5rem;
      color: var(--text-main);
      cursor: pointer;
      padding: 4px;
    }

    main {
      width: 100%;
      display: flex;
      flex-direction: column;
      align-items: center;
    }

    section {
      width: 100%;
      padding: 64px 0;
      border-bottom: 1px solid rgba(226, 232, 240, 0.8);
      position: relative;
    }

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

    .badge {
      display: inline-block;
      padding: 6px 16px;
      border-radius: 9999px;
      font-size: 0.825rem;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 1px;
      background: rgba(6, 182, 212, 0.12);
      color: #0284c7;
      border: 1px solid rgba(6, 182, 212, 0.3);
      margin-bottom: 12px;
    }

    .badge-pink {
      background: rgba(236, 72, 153, 0.12);
      color: #db2777;
      border-color: rgba(236, 72, 153, 0.3);
    }

    .section-header h2 {
      font-size: 2.1rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 14px;
      line-height: 1.3;
    }

    .section-header p {
      font-size: 1.05rem;
      color: var(--text-muted);
    }

    /* Hero */
    .hero-section {
      background: radial-gradient(circle at 10% 20%, rgba(6, 182, 212, 0.08) 0%, transparent 40%),
                  radial-gradient(circle at 90% 80%, rgba(236, 72, 153, 0.08) 0%, transparent 40%),
                  linear-gradient(180deg, #ffffff 0%, var(--bg-main) 100%);
      padding: 88px 0 72px;
      text-align: center;
    }

    .hero-content {
      max-width: 920px;
      margin: 0 auto;
    }

    .hero-content h1 {
      font-size: 2.75rem;
      font-weight: 900;
      line-height: 1.25;
      color: var(--text-main);
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }

    .hero-highlight {
      background: var(--neon-grad);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      display: inline-block;
    }

    .hero-desc {
      font-size: 1.2rem;
      color: var(--text-muted);
      margin-bottom: 36px;
      line-height: 1.65;
    }

    .hero-btn-group {
      display: flex;
      justify-content: center;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 54px;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 14px 32px;
      border-radius: 10px;
      font-size: 1.05rem;
      font-weight: 700;
      text-decoration: none;
      cursor: pointer;
      transition: all 0.25s ease;
      border: none;
    }

    .btn-primary {
      background: var(--neon-grad);
      color: #ffffff;
      box-shadow: 0 4px 20px rgba(6, 182, 212, 0.4);
    }

    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 8px 25px rgba(236, 72, 153, 0.5);
    }

    .btn-outline {
      background: #ffffff;
      color: var(--text-main);
      border: 2px solid #8b5cf6;
      box-shadow: 0 2px 10px rgba(139, 92, 246, 0.15);
    }

    .btn-outline:hover {
      background: rgba(139, 92, 246, 0.05);
      border-color: #ec4899;
      color: #7c3aed;
      transform: translateY(-2px);
    }

    .hero-metrics {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
      gap: 20px;
      margin-top: 20px;
    }

    .metric-card {
      background: var(--bg-card);
      padding: 24px 16px;
      border-radius: var(--border-radius);
      border: 1px solid rgba(139, 92, 246, 0.18);
      box-shadow: 0 2px 12px rgba(0, 0, 0, 0.04);
      transition: all 0.25s ease;
      position: relative;
      overflow: hidden;
    }

    .metric-card::after {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      height: 3px;
      background: var(--neon-grad);
      opacity: 0.8;
    }

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

    .metric-num {
      font-size: 2.2rem;
      font-weight: 800;
      color: #0f172a;
      line-height: 1.1;
      margin-bottom: 6px;
    }

    .metric-label {
      font-size: 0.9rem;
      color: var(--text-muted);
      font-weight: 500;
    }

    /* Grids & Cards */
    .cards-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
      gap: 24px;
    }

    .card {
      background: var(--bg-card);
      border-radius: var(--border-radius);
      border: 1px solid rgba(226, 232, 240, 0.9);
      padding: 28px;
      box-shadow: 0 4px 15px rgba(0, 0, 0, 0.03);
      transition: all 0.25s ease;
      display: flex;
      flex-direction: column;
      position: relative;
    }

    .card:hover {
      transform: translateY(-4px);
      border-color: rgba(6, 182, 212, 0.5);
      box-shadow: 0 10px 25px rgba(6, 182, 212, 0.15);
    }

    .card-icon {
      width: 48px;
      height: 48px;
      border-radius: 10px;
      background: linear-gradient(135deg, rgba(6, 182, 212, 0.15), rgba(139, 92, 246, 0.15));
      display: flex;
      align-items: center;
      justify-content: center;
      color: #0284c7;
      font-size: 1.4rem;
      margin-bottom: 18px;
    }

    .card h3 {
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 10px;
    }

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

    .model-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      margin-top: 14px;
    }

    .tag-pill {
      display: inline-block;
      padding: 4px 10px;
      border-radius: 6px;
      font-size: 0.8rem;
      font-weight: 600;
      background: #f1f5f9;
      color: #334155;
      border: 1px solid #e2e8f0;
    }

    /* Comparison Table */
    .table-wrapper {
      overflow-x: auto;
      background: var(--bg-card);
      border-radius: var(--border-radius);
      border: 1px solid rgba(139, 92, 246, 0.25);
      box-shadow: 0 4px 20px rgba(0, 0, 0, 0.04);
      margin-top: 24px;
    }

    table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 680px;
    }

    th, td {
      padding: 16px 20px;
      border-bottom: 1px solid #f1f5f9;
      font-size: 0.95rem;
    }

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

    tr:hover td {
      background: rgba(6, 182, 212, 0.02);
    }

    .score-badge {
      display: inline-block;
      padding: 4px 12px;
      background: var(--neon-grad);
      color: #fff;
      font-weight: 800;
      border-radius: 9999px;
      font-size: 0.875rem;
    }

    /* Flow Steps */
    .flow-steps {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
      gap: 20px;
    }

    .step-box {
      background: var(--bg-card);
      border: 1px solid #e2e8f0;
      border-radius: var(--border-radius);
      padding: 24px;
      position: relative;
      transition: all 0.25s ease;
    }

    .step-box:hover {
      border-color: var(--neon-cyan);
      box-shadow: var(--neon-glow);
    }

    .step-index {
      font-size: 2rem;
      font-weight: 900;
      color: rgba(139, 92, 246, 0.2);
      line-height: 1;
      margin-bottom: 10px;
    }

    .step-box h4 {
      font-size: 1.1rem;
      font-weight: 700;
      margin-bottom: 8px;
    }

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

    /* Media Visuals */
    .media-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 24px;
      align-items: center;
      margin-top: 32px;
    }

    .media-card {
      background: var(--bg-card);
      border-radius: var(--border-radius);
      overflow: hidden;
      border: 1px solid #e2e8f0;
      box-shadow: 0 4px 15px rgba(0, 0, 0, 0.03);
    }

    .media-card img {
      width: 100%;
      height: 200px;
      object-fit: cover;
      display: block;
      transition: transform 0.3s ease;
    }

    .media-card:hover img {
      transform: scale(1.02);
    }

    .media-info {
      padding: 18px;
    }

    .media-info h4 {
      font-size: 1.05rem;
      font-weight: 700;
      margin-bottom: 6px;
    }

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

    /* FAQ */
    .faq-list {
      max-width: 860px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }

    .faq-item {
      background: var(--bg-card);
      border-radius: var(--border-radius);
      border: 1px solid #e2e8f0;
      overflow: hidden;
      transition: border-color 0.2s ease;
    }

    .faq-item.active {
      border-color: #8b5cf6;
      box-shadow: 0 4px 15px rgba(139, 92, 246, 0.1);
    }

    .faq-question {
      padding: 18px 22px;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 700;
      font-size: 1.02rem;
      user-select: none;
    }

    .faq-toggle-icon {
      font-size: 1.25rem;
      color: #8b5cf6;
      transition: transform 0.25s ease;
    }

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

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

    .faq-answer-inner {
      padding: 0 22px 18px;
      color: var(--text-muted);
      font-size: 0.95rem;
      line-height: 1.6;
    }

    /* Reviews */
    .review-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
      gap: 20px;
    }

    .review-card {
      background: var(--bg-card);
      border-radius: var(--border-radius);
      padding: 24px;
      border: 1px solid #e2e8f0;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      position: relative;
    }

    .review-card::before {
      content: "“";
      position: absolute;
      top: 10px;
      right: 20px;
      font-size: 3.5rem;
      line-height: 1;
      color: rgba(6, 182, 212, 0.15);
      font-family: Georgia, serif;
    }

    .review-body {
      font-size: 0.95rem;
      color: #334155;
      line-height: 1.6;
      margin-bottom: 18px;
      position: relative;
      z-index: 1;
    }

    .reviewer-meta {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .reviewer-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: var(--neon-grad);
      display: flex;
      align-items: center;
      justify-content: center;
      color: #fff;
      font-weight: 700;
    }

    .reviewer-name {
      font-weight: 700;
      font-size: 0.95rem;
    }

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

    /* Form & Contact */
    .form-wrapper {
      max-width: 720px;
      margin: 0 auto;
      background: var(--bg-card);
      padding: 36px;
      border-radius: var(--border-radius);
      border: 1px solid rgba(139, 92, 246, 0.25);
      box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
    }

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

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

    .form-control {
      width: 100%;
      padding: 12px 16px;
      border-radius: 8px;
      border: 1px solid #cbd5e1;
      font-size: 0.95rem;
      font-family: inherit;
      color: var(--text-main);
      transition: border-color 0.2s ease, box-shadow 0.2s ease;
      background: #ffffff;
    }

    .form-control:focus {
      outline: none;
      border-color: #8b5cf6;
      box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.15);
    }

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

    .contact-columns {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
      margin-top: 40px;
    }

    .contact-card {
      background: var(--bg-card);
      border-radius: var(--border-radius);
      border: 1px solid #e2e8f0;
      padding: 24px;
      display: flex;
      flex-direction: column;
      align-items: center;
      text-align: center;
    }

    .contact-card img {
      max-width: 160px;
      height: auto;
      border-radius: 8px;
      border: 1px solid #e2e8f0;
      margin-bottom: 12px;
    }

    /* Article List */
    .article-links-container {
      background: var(--bg-card);
      border: 1px solid #e2e8f0;
      border-radius: var(--border-radius);
      padding: 24px;
      margin-top: 20px;
    }

    .article-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .article-list li a {
      color: #0284c7;
      text-decoration: none;
      font-weight: 600;
      font-size: 0.95rem;
      display: inline-flex;
      align-items: center;
      gap: 6px;
      transition: color 0.2s ease;
    }

    .article-list li a:hover {
      color: #ec4899;
    }

    /* Footer */
    footer {
      width: 100%;
      background: #0f172a;
      color: #94a3b8;
      padding: 48px 0 24px;
      border-top: 3px solid transparent;
      border-image: var(--neon-grad) 1;
      margin-top: auto;
    }

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

    .footer-col h4 {
      color: #ffffff;
      font-size: 1.05rem;
      font-weight: 700;
      margin-bottom: 16px;
    }

    .footer-col p {
      font-size: 0.9rem;
      line-height: 1.6;
      margin-bottom: 12px;
    }

    .footer-links-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 8px;
    }

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

    .footer-links-list a:hover {
      color: #38bdf8;
    }

    .friend-links {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 8px;
    }

    .friend-links a {
      color: #38bdf8;
      text-decoration: none;
      font-size: 0.85rem;
      background: rgba(255, 255, 255, 0.05);
      padding: 4px 10px;
      border-radius: 4px;
      border: 1px solid rgba(255, 255, 255, 0.1);
      transition: all 0.2s ease;
    }

    .friend-links a:hover {
      color: #ffffff;
      background: rgba(6, 182, 212, 0.2);
      border-color: #06b6d4;
    }

    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.1);
      padding-top: 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 0.85rem;
      flex-wrap: wrap;
      gap: 12px;
    }

    .footer-bottom a {
      color: #38bdf8;
      text-decoration: none;
    }

    /* Floating CTA */
    .floating-kefu {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      background: var(--neon-grad);
      color: #fff;
      width: 56px;
      height: 56px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 4px 20px rgba(6, 182, 212, 0.5);
      cursor: pointer;
      text-decoration: none;
      transition: transform 0.25s ease;
    }

    .floating-kefu:hover {
      transform: scale(1.08);
    }

    /* Responsive */
    @media (max-width: 992px) {
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
      .nav-links {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #ffffff;
        padding: 20px;
        box-shadow: 0 10px 20px rgba(0,0,0,0.1);
        border-bottom: 1px solid #e2e8f0;
      }
      .nav-links.show {
        display: flex;
      }
      .nav-toggle {
        display: block;
      }
      .hero-content h1 {
        font-size: 2.1rem;
      }
      .contact-columns {
        grid-template-columns: 1fr;
      }
    }

    @media (max-width: 600px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .section-header h2 {
        font-size: 1.65rem;
      }
      .hero-content h1 {
        font-size: 1.75rem;
      }
    }