:root {
      --bg-deep: #0a0614;
      --bg-card: rgba(26, 16, 48, 0.75);
      --bg-card-hover: rgba(38, 24, 70, 0.9);
      --primary-neon: #ff2a85;
      --secondary-neon: #9d4edd;
      --cyan-neon: #00f0ff;
      --text-main: #f8f9fa;
      --text-muted: #b8b2d1;
      --text-subtle: #797199;
      --border-glow: rgba(255, 42, 133, 0.3);
      --border-cyan: rgba(0, 240, 255, 0.3);
      --font-stack: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      --site-width: 1200px;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      background-color: var(--bg-deep);
      background-image: 
        radial-gradient(circle at 15% 15%, rgba(157, 78, 221, 0.25) 0%, transparent 45%),
        radial-gradient(circle at 85% 30%, rgba(255, 42, 133, 0.2) 0%, transparent 45%),
        radial-gradient(circle at 50% 85%, rgba(0, 240, 255, 0.15) 0%, transparent 50%),
        linear-gradient(180deg, #0a0614 0%, #120924 50%, #080312 100%);
      background-attachment: fixed;
      color: var(--text-main);
      font-family: var(--font-stack);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }
    .container {
      max-width: var(--site-width);
      margin: 0 auto;
      padding: 0 20px;
      width: 100%;
    }
    header.site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(10, 6, 20, 0.85);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(255, 42, 133, 0.2);
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .brand-wrap {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .ai-page-logo {
      height: 38px;
      width: auto;
      display: block;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
      list-style: none;
    }
    .nav-links li a {
      color: var(--text-muted);
      text-decoration: none;
      font-size: 15px;
      padding: 8px 14px;
      border-radius: 6px;
      transition: all 0.25s ease;
      display: inline-block;
    }
    .nav-links li a:hover,
    .nav-links li a.active {
      color: #fff;
      text-shadow: 0 0 8px rgba(255, 42, 133, 0.8);
      background: rgba(255, 42, 133, 0.1);
    }
    .header-actions {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      font-size: 15px;
      font-weight: 600;
      border-radius: 8px;
      text-decoration: none;
      transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
      cursor: pointer;
      border: 1px solid transparent;
      white-space: nowrap;
    }
    .btn-primary {
      background: linear-gradient(135deg, var(--primary-neon), var(--secondary-neon));
      color: #fff;
      box-shadow: 0 0 16px rgba(255, 42, 133, 0.4);
    }
    .btn-primary:hover {
      box-shadow: 0 0 24px rgba(255, 42, 133, 0.7);
      transform: translateY(-2px);
    }
    .btn-outline {
      background: rgba(255, 255, 255, 0.05);
      border-color: var(--border-glow);
      color: var(--text-main);
    }
    .btn-outline:hover {
      background: rgba(255, 42, 133, 0.15);
      border-color: var(--primary-neon);
      transform: translateY(-2px);
    }
    .mobile-menu-toggle {
      display: none;
      background: none;
      border: none;
      color: #fff;
      font-size: 24px;
      cursor: pointer;
    }
    section.page-section {
      padding: 80px 0;
      position: relative;
    }
    .section-header {
      text-align: center;
      max-width: 800px;
      margin: 0 auto 50px;
    }
    .section-tag {
      display: inline-block;
      font-size: 13px;
      text-transform: uppercase;
      letter-spacing: 2px;
      color: var(--cyan-neon);
      background: rgba(0, 240, 255, 0.1);
      padding: 4px 12px;
      border-radius: 20px;
      border: 1px solid var(--border-cyan);
      margin-bottom: 12px;
    }
    .section-title {
      font-size: 32px;
      font-weight: 700;
      color: #ffffff;
      margin-bottom: 16px;
      text-shadow: 0 2px 10px rgba(0, 0, 0, 0.5);
    }
    .section-subtitle {
      font-size: 16px;
      color: var(--text-muted);
    }
    .hero-section {
      padding: 100px 0 80px;
      text-align: center;
      position: relative;
    }
    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: rgba(157, 78, 221, 0.2);
      border: 1px solid rgba(157, 78, 221, 0.4);
      padding: 6px 18px;
      border-radius: 30px;
      font-size: 14px;
      color: #ffd6ff;
      margin-bottom: 24px;
      box-shadow: 0 0 12px rgba(157, 78, 221, 0.3);
    }
    .hero-title {
      font-size: 46px;
      font-weight: 800;
      line-height: 1.25;
      margin-bottom: 24px;
      background: linear-gradient(135deg, #ffffff 30%, #ff80bf 70%, #00f0ff 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .hero-desc {
      font-size: 18px;
      color: var(--text-muted);
      max-width: 820px;
      margin: 0 auto 36px;
    }
    .hero-cta {
      display: flex;
      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: 40px;
    }
    .metric-card {
      background: var(--bg-card);
      border: 1px solid rgba(255, 255, 255, 0.08);
      padding: 24px 16px;
      border-radius: 12px;
      text-align: center;
      transition: all 0.3s ease;
    }
    .metric-card:hover {
      border-color: var(--primary-neon);
      transform: translateY(-4px);
    }
    .metric-val {
      font-size: 34px;
      font-weight: 700;
      color: var(--cyan-neon);
      margin-bottom: 6px;
      font-family: monospace;
    }
    .metric-lbl {
      font-size: 14px;
      color: var(--text-muted);
    }
    .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: 24px;
    }
    .service-card {
      background: var(--bg-card);
      border: 1px solid rgba(157, 78, 221, 0.25);
      border-radius: 12px;
      padding: 24px;
      transition: all 0.3s ease;
      display: flex;
      flex-direction: column;
    }
    .service-card:hover {
      background: var(--bg-card-hover);
      border-color: var(--primary-neon);
      box-shadow: 0 8px 24px rgba(255, 42, 133, 0.2);
      transform: translateY(-4px);
    }
    .service-icon {
      font-size: 26px;
      margin-bottom: 16px;
      display: inline-block;
    }
    .service-card h3 {
      font-size: 18px;
      margin-bottom: 10px;
      color: #fff;
    }
    .service-card p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
      flex-grow: 1;
    }
    .media-card {
      background: var(--bg-card);
      border: 1px solid rgba(255, 255, 255, 0.08);
      border-radius: 12px;
      overflow: hidden;
      display: flex;
      flex-direction: column;
    }
    .media-card-img-wrap {
      width: 100%;
      aspect-ratio: 16 / 9;
      background: #14092b;
      overflow: hidden;
    }
    .media-card-img-wrap.square {
      aspect-ratio: 1 / 1;
    }
    .media-card img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.4s ease;
    }
    .media-card:hover img {
      transform: scale(1.05);
    }
    .media-card-body {
      padding: 20px;
    }
    .media-card-body h4 {
      font-size: 17px;
      margin-bottom: 8px;
      color: #fff;
    }
    .media-card-body p {
      font-size: 13px;
      color: var(--text-muted);
    }
    .rating-banner {
      background: linear-gradient(135deg, rgba(255, 42, 133, 0.15), rgba(157, 78, 221, 0.2));
      border: 1px solid var(--border-glow);
      border-radius: 12px;
      padding: 24px 30px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: 30px;
      flex-wrap: wrap;
      gap: 16px;
    }
    .rating-score-box {
      display: flex;
      align-items: center;
      gap: 16px;
    }
    .rating-num {
      font-size: 40px;
      font-weight: 800;
      color: var(--cyan-neon);
      font-family: monospace;
    }
    .stars {
      color: #ffd166;
      font-size: 18px;
      letter-spacing: 2px;
    }
    .compare-table-wrap {
      overflow-x: auto;
      background: var(--bg-card);
      border: 1px solid rgba(255, 255, 255, 0.1);
      border-radius: 12px;
    }
    table.compare-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
    }
    table.compare-table th,
    table.compare-table td {
      padding: 16px 20px;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
      font-size: 14px;
    }
    table.compare-table th {
      background: rgba(157, 78, 221, 0.15);
      color: #fff;
      font-weight: 600;
    }
    table.compare-table tr:hover td {
      background: rgba(255, 255, 255, 0.02);
    }
    .highlight-col {
      color: var(--cyan-neon);
      font-weight: 600;
      background: rgba(255, 42, 133, 0.05);
    }
    .model-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-top: 30px;
    }
    .model-tag {
      background: rgba(255, 255, 255, 0.05);
      border: 1px solid rgba(255, 255, 255, 0.1);
      padding: 8px 16px;
      border-radius: 20px;
      font-size: 13px;
      color: var(--text-muted);
      transition: all 0.2s ease;
    }
    .model-tag:hover {
      border-color: var(--cyan-neon);
      color: #fff;
      background: rgba(0, 240, 255, 0.1);
      transform: translateY(-2px);
    }
    .faq-list {
      display: flex;
      flex-direction: column;
      gap: 12px;
      max-width: 900px;
      margin: 0 auto;
    }
    .faq-item {
      background: var(--bg-card);
      border: 1px solid rgba(255, 255, 255, 0.08);
      border-radius: 10px;
      overflow: hidden;
      transition: border-color 0.2s ease;
    }
    .faq-item:hover {
      border-color: var(--border-glow);
    }
    .faq-question {
      padding: 18px 24px;
      font-size: 16px;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: space-between;
      user-select: none;
    }
    .faq-icon {
      font-size: 18px;
      color: var(--primary-neon);
      transition: transform 0.3s ease;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease, padding 0.35s ease;
      background: rgba(10, 6, 20, 0.3);
      color: var(--text-muted);
      font-size: 14px;
      line-height: 1.7;
      padding: 0 24px;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 0 24px 18px 24px;
    }
    .testimonial-card {
      background: var(--bg-card);
      border: 1px solid rgba(255, 255, 255, 0.08);
      border-radius: 12px;
      padding: 24px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .testimonial-user {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-top: 16px;
    }
    .user-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--secondary-neon), var(--primary-neon));
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: bold;
      color: #fff;
    }
    .user-info h5 {
      font-size: 15px;
      color: #fff;
    }
    .user-info span {
      font-size: 12px;
      color: var(--text-subtle);
    }
    .form-wrapper {
      background: var(--bg-card);
      border: 1px solid var(--border-glow);
      border-radius: 16px;
      padding: 40px;
      max-width: 750px;
      margin: 0 auto;
      box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
    }
    .form-group {
      margin-bottom: 20px;
    }
    .form-group label {
      display: block;
      font-size: 14px;
      font-weight: 500;
      margin-bottom: 8px;
      color: var(--text-muted);
    }
    .form-control {
      width: 100%;
      background: rgba(10, 6, 20, 0.8);
      border: 1px solid rgba(255, 255, 255, 0.15);
      border-radius: 8px;
      padding: 12px 16px;
      color: #fff;
      font-size: 14px;
      outline: none;
      transition: all 0.25s ease;
      font-family: inherit;
    }
    .form-control:focus {
      border-color: var(--primary-neon);
      box-shadow: 0 0 10px rgba(255, 42, 133, 0.3);
    }
    textarea.form-control {
      min-height: 120px;
      resize: vertical;
    }
    .articles-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
      gap: 16px;
      margin-top: 24px;
    }
    .article-item-link {
      display: block;
      background: var(--bg-card);
      border: 1px solid rgba(255, 255, 255, 0.08);
      padding: 16px;
      border-radius: 8px;
      color: var(--text-muted);
      text-decoration: none;
      font-size: 14px;
      transition: all 0.2s ease;
      word-break: break-all;
    }
    .article-item-link:hover {
      border-color: var(--cyan-neon);
      color: #fff;
      transform: translateX(4px);
    }
    .article-meta-slot {
      margin-bottom: 20px;
      background: rgba(255, 42, 133, 0.06);
      border-left: 3px solid var(--primary-neon);
      padding: 12px 16px;
      border-radius: 0 8px 8px 0;
      font-size: 14px;
      color: #ff9ec7;
    }
    .friend-links-area {
      display: flex;
      flex-wrap: wrap;
      gap: 14px;
      margin-top: 20px;
    }
    .friend-links-area a {
      color: var(--text-muted);
      text-decoration: none;
      font-size: 14px;
      background: rgba(255, 255, 255, 0.04);
      padding: 6px 14px;
      border-radius: 6px;
      border: 1px solid rgba(255, 255, 255, 0.08);
      transition: all 0.2s ease;
    }
    .friend-links-area a:hover {
      color: #fff;
      border-color: var(--primary-neon);
      background: rgba(255, 42, 133, 0.1);
    }
    footer.site-footer {
      background: #06030d;
      border-top: 1px solid rgba(255, 255, 255, 0.1);
      padding: 60px 0 30px;
      color: var(--text-muted);
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
      margin-bottom: 40px;
    }
    .footer-col h4 {
      color: #fff;
      font-size: 16px;
      margin-bottom: 18px;
    }
    .footer-col p {
      font-size: 14px;
      line-height: 1.6;
      margin-bottom: 10px;
    }
    .footer-links-list {
      list-style: none;
    }
    .footer-links-list li {
      margin-bottom: 8px;
    }
    .footer-links-list a {
      color: var(--text-muted);
      text-decoration: none;
      font-size: 14px;
      transition: color 0.2s ease;
    }
    .footer-links-list a:hover {
      color: var(--primary-neon);
    }
    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.06);
      padding-top: 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 13px;
      color: var(--text-subtle);
      flex-wrap: wrap;
      gap: 12px;
    }
    .float-contact {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .float-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: var(--bg-card);
      border: 1px solid var(--border-glow);
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 20px;
      cursor: pointer;
      box-shadow: 0 4px 14px rgba(0, 0, 0, 0.4);
      transition: all 0.25s ease;
      position: relative;
    }
    .float-btn:hover {
      background: var(--primary-neon);
      transform: scale(1.08);
    }
    .float-qr-popup {
      position: absolute;
      right: 60px;
      bottom: 0;
      background: #14092b;
      border: 1px solid var(--border-glow);
      padding: 12px;
      border-radius: 8px;
      display: none;
      width: 140px;
      box-shadow: 0 8px 24px rgba(0, 0, 0, 0.6);
      text-align: center;
    }
    .float-qr-popup img {
      width: 100%;
      height: auto;
      display: block;
      border-radius: 4px;
      margin-bottom: 6px;
    }
    .float-qr-popup span {
      font-size: 11px;
      color: var(--text-muted);
    }
    .float-btn.qr-trigger:hover .float-qr-popup {
      display: block;
    }
    .process-steps {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      position: relative;
    }
    .step-box {
      background: var(--bg-card);
      border: 1px solid rgba(255, 255, 255, 0.08);
      border-radius: 12px;
      padding: 24px;
      text-align: center;
      position: relative;
    }
    .step-box::before {
      content: attr(data-step);
      position: absolute;
      top: -14px;
      left: 50%;
      transform: translateX(-50%);
      background: var(--secondary-neon);
      color: #fff;
      width: 28px;
      height: 28px;
      border-radius: 50%;
      font-size: 13px;
      font-weight: 700;
      display: flex;
      align-items: center;
      justify-content: center;
      border: 2px solid var(--bg-deep);
    }
    @media (max-width: 992px) {
      .grid-4 {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
      .process-steps {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .hero-metrics {
        grid-template-columns: repeat(2, 1fr);
      }
      .mobile-menu-toggle {
        display: block;
      }
      .nav-links {
        position: fixed;
        top: 72px;
        left: 0;
        right: 0;
        background: #100824;
        flex-direction: column;
        align-items: flex-start;
        padding: 20px;
        display: none;
        border-bottom: 1px solid var(--border-glow);
      }
      .nav-links.show {
        display: flex;
      }
      .nav-links li {
        width: 100%;
      }
      .nav-links li a {
        display: block;
        padding: 12px 16px;
      }
      .header-actions .btn {
        display: none;
      }
    }
    @media (max-width: 600px) {
      .hero-title {
        font-size: 30px;
      }
      .hero-desc {
        font-size: 15px;
      }
      .grid-4, .grid-3, .grid-2, .process-steps {
        grid-template-columns: 1fr;
      }
      .hero-metrics {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .form-wrapper {
        padding: 24px 16px;
      }
      .rating-banner {
        flex-direction: column;
        align-items: flex-start;
      }
    }