:root {
      --bg-main: #0b0d19;
      --bg-card: #13172d;
      --bg-card-hover: #1c2242;
      --neon-cyan: #00f0ff;
      --neon-pink: #ff007f;
      --neon-purple: #8a2be2;
      --neon-blue: #0070f3;
      --text-main: #f8fafc;
      --text-muted: #94a3b8;
      --border-color: rgba(0, 240, 255, 0.2);
      --border-glow: 0 0 15px rgba(0, 240, 255, 0.3);
      --container-max: 1200px;
    }

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
      scroll-behavior: smooth;
    }

    body {
      background-color: var(--bg-main);
      color: var(--text-main);
      line-height: 1.6;
      overflow-x: hidden;
      display: flex;
      flex-direction: column;
      min-height: 100vh;
    }

    a {
      color: var(--neon-cyan);
      text-decoration: none;
      transition: all 0.3s ease;
    }

    a:hover {
      color: var(--neon-pink);
      text-shadow: 0 0 8px rgba(255, 0, 127, 0.6);
    }

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

    .section-title {
      text-align: center;
      margin-bottom: 3rem;
      position: relative;
    }

    .section-title h2 {
      font-size: 2.2rem;
      font-weight: 700;
      color: #fff;
      text-transform: uppercase;
      letter-spacing: 1px;
      display: inline-block;
      position: relative;
    }

    .section-title h2::after {
      content: '';
      display: block;
      width: 60px;
      height: 4px;
      background: linear-gradient(90deg, var(--neon-cyan), var(--neon-pink));
      margin: 10px auto 0;
      border-radius: 2px;
      box-shadow: var(--border-glow);
    }

    .section-title p {
      color: var(--text-muted);
      margin-top: 10px;
      font-size: 1rem;
    }

    header.site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(11, 13, 25, 0.9);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
      padding: 12px 0;
    }

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

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

    .logo-container .ai-page-logo {
      height: 40px;
      width: auto;
    }

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

    .nav-links li a {
      color: #e2e8f0;
      font-size: 0.95rem;
      font-weight: 500;
      padding: 8px 14px;
      border-radius: 6px;
      transition: background 0.2s, color 0.2s;
    }

    .nav-links li a:hover {
      background: rgba(0, 240, 255, 0.1);
      color: var(--neon-cyan);
    }

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

    .btn-neon {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 24px;
      font-size: 0.95rem;
      font-weight: 600;
      color: #fff;
      background: linear-gradient(135deg, var(--neon-blue), var(--neon-purple));
      border: 1px solid var(--neon-cyan);
      border-radius: 8px;
      cursor: pointer;
      box-shadow: 0 0 15px rgba(0, 112, 243, 0.4);
      transition: all 0.3s ease;
      text-decoration: none;
    }

    .btn-neon:hover {
      transform: translateY(-2px);
      box-shadow: 0 0 25px rgba(0, 240, 255, 0.7);
      color: #fff;
    }

    .btn-outline {
      border: 1px solid var(--neon-cyan);
      color: var(--neon-cyan);
      background: transparent;
      padding: 10px 22px;
      border-radius: 8px;
      font-weight: 600;
      transition: all 0.3s;
    }

    .btn-outline:hover {
      background: rgba(0, 240, 255, 0.15);
      box-shadow: var(--border-glow);
    }

    .mobile-menu-btn {
      display: none;
      background: transparent;
      border: none;
      color: #fff;
      font-size: 1.5rem;
      cursor: pointer;
    }

    .hero-section {
      padding: 100px 0 80px;
      position: relative;
      background: radial-gradient(circle at 50% 30%, rgba(138, 43, 226, 0.2), rgba(11, 13, 25, 0.95) 70%);
      border-bottom: 1px solid rgba(255, 255, 255, 0.05);
      text-align: center;
    }

    .hero-badge {
      display: inline-block;
      padding: 6px 16px;
      background: rgba(0, 240, 255, 0.1);
      border: 1px solid var(--neon-cyan);
      border-radius: 50px;
      color: var(--neon-cyan);
      font-size: 0.85rem;
      font-weight: 600;
      margin-bottom: 24px;
      letter-spacing: 1px;
      box-shadow: var(--border-glow);
    }

    .hero-title {
      font-size: 2.8rem;
      line-height: 1.25;
      font-weight: 800;
      margin-bottom: 20px;
      background: linear-gradient(135deg, #ffffff 30%, var(--neon-cyan) 70%, var(--neon-pink) 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-desc {
      font-size: 1.15rem;
      color: var(--text-muted);
      max-width: 780px;
      margin: 0 auto 36px;
    }

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

    .hero-cta-group .btn-main-site {
      padding: 12px 36px;
      font-size: 1.1rem;
      background: linear-gradient(90deg, var(--neon-pink), var(--neon-purple));
      border: 1px solid rgba(255, 255, 255, 0.4);
      box-shadow: 0 0 20px rgba(255, 0, 127, 0.5);
    }

    .hero-cta-group .btn-main-site:hover {
      box-shadow: 0 0 30px rgba(255, 0, 127, 0.8);
    }

    .hero-stats {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      margin-top: 40px;
      background: rgba(19, 23, 45, 0.6);
      padding: 24px;
      border-radius: 12px;
      border: 1px solid rgba(255, 255, 255, 0.05);
    }

    .stat-item h3 {
      font-size: 2rem;
      color: var(--neon-cyan);
      margin-bottom: 4px;
      font-weight: 700;
    }

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

    section {
      padding: 80px 0;
    }

    .card {
      background: var(--bg-card);
      border: 1px solid rgba(255, 255, 255, 0.05);
      border-radius: 12px;
      padding: 30px;
      transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
      position: relative;
      overflow: hidden;
    }

    .card::before {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 3px;
      background: transparent;
      transition: background 0.3s ease;
    }

    .card:hover {
      transform: translateY(-5px);
      background: var(--bg-card-hover);
      border-color: rgba(0, 240, 255, 0.4);
      box-shadow: 0 10px 25px rgba(0, 0, 0, 0.5), 0 0 15px rgba(0, 240, 255, 0.1);
    }

    .card:hover::before {
      background: linear-gradient(90deg, var(--neon-cyan), var(--neon-pink));
    }

    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 30px;
    }

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

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

    .model-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      margin-top: 20px;
    }

    .model-badge {
      background: rgba(255, 255, 255, 0.05);
      border: 1px solid rgba(0, 240, 255, 0.2);
      padding: 6px 14px;
      border-radius: 6px;
      font-size: 0.85rem;
      color: #e2e8f0;
      transition: all 0.2s ease;
    }

    .model-badge:hover {
      border-color: var(--neon-cyan);
      background: rgba(0, 240, 255, 0.1);
      box-shadow: 0 0 8px rgba(0, 240, 255, 0.3);
    }

    .feature-card h3 {
      font-size: 1.25rem;
      margin-bottom: 12px;
      color: #fff;
    }

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

    .process-step {
      display: flex;
      gap: 20px;
      align-items: flex-start;
      margin-bottom: 24px;
    }

    .step-num {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--neon-cyan), var(--neon-blue));
      color: #000;
      font-weight: 700;
      display: flex;
      align-items: center;
      justify-content: center;
      flex-shrink: 0;
      box-shadow: 0 0 10px rgba(0, 240, 255, 0.4);
    }

    .step-content h4 {
      font-size: 1.1rem;
      margin-bottom: 6px;
      color: #fff;
    }

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

    .table-container {
      width: 100%;
      overflow-x: auto;
      border-radius: 12px;
      border: 1px solid rgba(255, 255, 255, 0.08);
      background: var(--bg-card);
    }

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

    table th, table td {
      padding: 16px 20px;
      border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    }

    table th {
      background: rgba(0, 0, 0, 0.3);
      color: var(--neon-cyan);
      font-weight: 600;
      font-size: 0.95rem;
    }

    table tr:hover td {
      background: rgba(255, 255, 255, 0.02);
    }

    .highlight-cell {
      color: var(--neon-pink);
      font-weight: bold;
    }

    .rating-banner {
      background: linear-gradient(90deg, rgba(255, 0, 127, 0.1), rgba(0, 240, 255, 0.1));
      border: 1px solid var(--neon-pink);
      border-radius: 12px;
      padding: 24px;
      display: flex;
      justify-content: space-around;
      align-items: center;
      margin-bottom: 30px;
      box-shadow: 0 0 20px rgba(255, 0, 127, 0.2);
    }

    .rating-item {
      text-align: center;
    }

    .rating-item .score {
      font-size: 2.4rem;
      font-weight: 800;
      color: var(--neon-pink);
      text-shadow: 0 0 10px rgba(255, 0, 127, 0.4);
    }

    .rating-item .label {
      font-size: 0.9rem;
      color: var(--text-muted);
    }

    .faq-list {
      display: flex;
      flex-direction: column;
      gap: 14px;
    }

    .faq-item {
      background: var(--bg-card);
      border: 1px solid rgba(255, 255, 255, 0.05);
      border-radius: 8px;
      overflow: hidden;
      transition: all 0.3s ease;
    }

    .faq-header {
      padding: 18px 24px;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 600;
      color: #fff;
    }

    .faq-header:hover {
      color: var(--neon-cyan);
    }

    .faq-body {
      padding: 0 24px;
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      color: var(--text-muted);
      font-size: 0.95rem;
      background: rgba(0, 0, 0, 0.2);
    }

    .faq-item.active .faq-body {
      padding: 16px 24px 20px;
      max-height: 300px;
    }

    .faq-icon {
      font-size: 1.2rem;
      transition: transform 0.3s;
    }

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

    .comment-card {
      background: var(--bg-card);
      border-radius: 12px;
      padding: 24px;
      border: 1px solid rgba(255, 255, 255, 0.05);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .comment-card .user-meta {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 16px;
    }

    .comment-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--neon-purple), var(--neon-pink));
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: bold;
      color: #fff;
    }

    .user-info h4 {
      font-size: 1rem;
      color: #fff;
    }

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

    .comment-text {
      font-size: 0.9rem;
      color: #cbd5e1;
      line-height: 1.6;
    }

    .img-box {
      border-radius: 8px;
      overflow: hidden;
      border: 1px solid rgba(255, 255, 255, 0.1);
      margin-bottom: 16px;
      background: #000;
    }

    .img-box img {
      width: 100%;
      height: auto;
      display: block;
      transition: transform 0.4s ease;
    }

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

    .form-box {
      background: var(--bg-card);
      border: 1px solid rgba(0, 240, 255, 0.3);
      box-shadow: var(--border-glow);
      border-radius: 12px;
      padding: 36px;
    }

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

    .form-group label {
      display: block;
      margin-bottom: 8px;
      font-size: 0.9rem;
      color: #cbd5e1;
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      background: rgba(11, 13, 25, 0.8);
      border: 1px solid rgba(255, 255, 255, 0.15);
      border-radius: 6px;
      color: #fff;
      font-size: 0.95rem;
      outline: none;
      transition: border-color 0.3s;
    }

    .form-control:focus {
      border-color: var(--neon-cyan);
      box-shadow: 0 0 8px rgba(0, 240, 255, 0.3);
    }

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

    .article-links {
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .article-item {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 14px 18px;
      background: var(--bg-card);
      border-radius: 8px;
      border: 1px solid rgba(255, 255, 255, 0.05);
      transition: all 0.2s ease;
    }

    .article-item:hover {
      border-color: var(--neon-cyan);
      transform: translateX(4px);
    }

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

    .contact-info-item {
      display: flex;
      align-items: center;
      gap: 12px;
      color: #cbd5e1;
    }

    .contact-info-item strong {
      color: #fff;
    }

    .site-footer {
      background: #06070d;
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      padding: 60px 0 30px;
      margin-top: auto;
    }

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

    .footer-col h4 {
      color: #fff;
      font-size: 1.1rem;
      margin-bottom: 18px;
      position: relative;
    }

    .footer-col p {
      color: var(--text-muted);
      font-size: 0.9rem;
      line-height: 1.6;
      margin-bottom: 12px;
    }

    .footer-col ul {
      list-style: none;
    }

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

    .footer-col ul li a {
      color: var(--text-muted);
      font-size: 0.9rem;
    }

    .footer-col ul li a:hover {
      color: var(--neon-cyan);
    }

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

    .friend-links a {
      background: rgba(255, 255, 255, 0.05);
      padding: 4px 10px;
      border-radius: 4px;
      font-size: 0.8rem;
      color: var(--text-muted);
    }

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

    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.05);
      padding-top: 24px;
      text-align: center;
      color: var(--text-muted);
      font-size: 0.85rem;
    }

    .float-panel {
      position: fixed;
      right: 20px;
      bottom: 40px;
      display: flex;
      flex-direction: column;
      gap: 12px;
      z-index: 999;
    }

    .float-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: var(--bg-card);
      border: 1px solid var(--neon-cyan);
      box-shadow: var(--border-glow);
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--neon-cyan);
      cursor: pointer;
      font-size: 1.2rem;
      transition: all 0.3s ease;
      position: relative;
    }

    .float-btn:hover {
      background: var(--neon-cyan);
      color: #000;
    }

    .qr-popup {
      position: absolute;
      right: 60px;
      bottom: 0;
      background: var(--bg-card);
      border: 1px solid var(--neon-cyan);
      border-radius: 8px;
      padding: 12px;
      width: 140px;
      text-align: center;
      display: none;
      box-shadow: 0 0 20px rgba(0, 0, 0, 0.8);
    }

    .qr-popup img {
      width: 100%;
      height: auto;
      border-radius: 4px;
    }

    .qr-popup span {
      display: block;
      font-size: 0.75rem;
      color: #cbd5e1;
      margin-top: 6px;
    }

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

    @media (max-width: 992px) {
      .grid-4 {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
      .hero-stats {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background: var(--bg-card);
        flex-direction: column;
        padding: 20px 0;
        border-bottom: 1px solid var(--border-color);
      }
      .nav-links.active {
        display: flex;
      }
      .mobile-menu-btn {
        display: block;
      }
      .grid-2, .grid-3, .grid-4 {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .hero-title {
        font-size: 2rem;
      }
      .hero-cta-group {
        flex-direction: column;
      }
    }