:root {
      --bg-page: #f6f8fd;
      --bg-card: #ffffff;
      --bg-card-alt: #f0f4fd;
      --text-main: #131b2e;
      --text-muted: #5c6b8a;
      --neon-cyan: #00d2ff;
      --neon-purple: #7928ca;
      --neon-emerald: #00f2fe;
      --neon-accent: #ff007a;
      --gradient-brand: linear-gradient(135deg, #00d2ff 0%, #7928ca 100%);
      --gradient-glow: linear-gradient(135deg, rgba(0, 210, 255, 0.12) 0%, rgba(121, 40, 202, 0.12) 100%);
      --border-light: #e1e7f5;
      --border-glow: rgba(0, 210, 255, 0.4);
      --shadow-sm: 0 4px 12px rgba(19, 27, 46, 0.04);
      --shadow-hover: 0 12px 28px rgba(0, 210, 255, 0.16);
      --radius: 12px;
    }

    * {
      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-page);
      color: var(--text-main);
    }

    body {
      background: radial-gradient(circle at 15% 15%, rgba(0, 210, 255, 0.05), transparent 40%),
                  radial-gradient(circle at 85% 65%, rgba(121, 40, 202, 0.05), transparent 40%),
                  var(--bg-page);
      line-height: 1.6;
      overflow-x: hidden;
    }

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

    header.site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.94);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-light);
      box-shadow: var(--shadow-sm);
    }

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

    .brand-logo-wrap {
      display: flex;
      align-items: center;
      gap: 12px;
      text-decoration: none;
    }

    .brand-logo-wrap .ai-page-logo {
      height: 40px;
      width: auto;
      display: block;
    }

    .brand-name {
      font-size: 1.25rem;
      font-weight: 700;
      background: var(--gradient-brand);
      -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 {
      color: var(--text-main);
      text-decoration: none;
      font-size: 0.95rem;
      font-weight: 500;
      padding: 8px 14px;
      border-radius: 6px;
      transition: all 0.25s ease;
      display: inline-block;
    }

    .nav-links li a:hover {
      color: #7928ca;
      background: var(--bg-card-alt);
    }

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      font-size: 0.95rem;
      font-weight: 600;
      border-radius: 8px;
      text-decoration: none;
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
      cursor: pointer;
      border: 1px solid transparent;
    }

    .btn-primary {
      background: var(--gradient-brand);
      color: #ffffff !important;
      box-shadow: 0 4px 14px rgba(0, 210, 255, 0.3);
    }

    .btn-primary:hover {
      box-shadow: 0 6px 20px rgba(121, 40, 202, 0.4);
      transform: translateY(-2px);
    }

    .btn-outline {
      background: #ffffff;
      border: 1px solid var(--neon-cyan);
      color: #131b2e;
    }

    .btn-outline:hover {
      background: var(--bg-card-alt);
      border-color: var(--neon-purple);
      transform: translateY(-2px);
    }

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

    .hero-section {
      padding: 80px 0 60px;
      text-align: center;
      position: relative;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      padding: 6px 16px;
      background: #ffffff;
      border: 1px solid var(--border-glow);
      border-radius: 30px;
      font-size: 0.85rem;
      font-weight: 600;
      color: #7928ca;
      margin-bottom: 24px;
      box-shadow: 0 2px 10px rgba(0, 210, 255, 0.15);
    }

    .hero-title {
      font-size: 2.8rem;
      line-height: 1.25;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }

    .hero-title span {
      background: var(--gradient-brand);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      display: inline-block;
    }

    .hero-desc {
      font-size: 1.15rem;
      color: var(--text-muted);
      max-width: 800px;
      margin: 0 auto 36px;
      line-height: 1.7;
    }

    .hero-actions {
      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: 20px;
    }

    .metric-card {
      background: #ffffff;
      padding: 24px;
      border-radius: var(--radius);
      border: 1px solid var(--border-light);
      box-shadow: var(--shadow-sm);
      transition: transform 0.3s ease, border-color 0.3s ease;
      text-align: center;
    }

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

    .metric-num {
      font-size: 2rem;
      font-weight: 800;
      background: var(--gradient-brand);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      margin-bottom: 6px;
    }

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

    section {
      padding: 70px 0;
      border-bottom: 1px solid rgba(225, 231, 245, 0.6);
    }

    .section-header {
      text-align: center;
      max-width: 700px;
      margin: 0 auto 48px;
    }

    .section-tag {
      font-size: 0.85rem;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 1px;
      color: #00d2ff;
      margin-bottom: 8px;
      display: inline-block;
    }

    .section-title {
      font-size: 2rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 12px;
    }

    .section-subtitle {
      font-size: 1rem;
      color: var(--text-muted);
    }

    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 28px;
    }

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

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

    .card {
      background: var(--bg-card);
      border-radius: var(--radius);
      border: 1px solid var(--border-light);
      padding: 28px;
      transition: all 0.3s ease;
      display: flex;
      flex-direction: column;
      position: relative;
    }

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

    .card-icon {
      width: 48px;
      height: 48px;
      border-radius: 10px;
      background: var(--gradient-glow);
      border: 1px solid var(--border-glow);
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
      color: #7928ca;
      font-weight: bold;
      font-size: 1.2rem;
    }

    .card-title {
      font-size: 1.2rem;
      font-weight: 700;
      margin-bottom: 12px;
      color: var(--text-main);
    }

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

    .model-pills {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      margin-top: 24px;
      justify-content: center;
    }

    .model-pill {
      background: #ffffff;
      border: 1px solid var(--border-light);
      padding: 6px 14px;
      border-radius: 20px;
      font-size: 0.85rem;
      font-weight: 600;
      color: var(--text-main);
      box-shadow: 0 2px 6px rgba(0, 0, 0, 0.02);
      transition: border-color 0.25s, transform 0.25s;
    }

    .model-pill:hover {
      border-color: var(--neon-purple);
      color: #7928ca;
      transform: translateY(-2px);
    }

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

    .pricing-table, .review-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
    }

    .pricing-table th, .pricing-table td,
    .review-table th, .review-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-light);
      font-size: 0.95rem;
    }

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

    .pricing-table tr:hover, .review-table tr:hover {
      background-color: rgba(0, 210, 255, 0.02);
    }

    .highlight-cell {
      color: #7928ca;
      font-weight: 700;
    }

    .badge-discount {
      display: inline-block;
      padding: 2px 8px;
      background: rgba(255, 0, 122, 0.1);
      color: #ff007a;
      font-size: 0.8rem;
      border-radius: 4px;
      font-weight: 600;
    }

    .review-score-box {
      background: var(--gradient-brand);
      color: #ffffff;
      border-radius: var(--radius);
      padding: 32px;
      text-align: center;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      box-shadow: 0 10px 24px rgba(0, 210, 255, 0.25);
    }

    .review-score-box .score-val {
      font-size: 3.5rem;
      font-weight: 800;
      line-height: 1;
      margin-bottom: 8px;
    }

    .review-stars {
      color: #ffd700;
      font-size: 1.4rem;
      margin-bottom: 8px;
      letter-spacing: 2px;
    }

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

    .timeline-step {
      background: #ffffff;
      border: 1px solid var(--border-light);
      border-radius: var(--radius);
      padding: 24px;
      position: relative;
    }

    .step-number {
      font-size: 1.8rem;
      font-weight: 800;
      background: var(--gradient-brand);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      margin-bottom: 12px;
    }

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

    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-light);
      border-radius: var(--radius);
      overflow: hidden;
      transition: border-color 0.25s ease;
    }

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

    .faq-question {
      padding: 18px 24px;
      font-weight: 600;
      font-size: 1.05rem;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      user-select: none;
      color: var(--text-main);
    }

    .faq-question::after {
      content: "+";
      font-size: 1.4rem;
      color: #7928ca;
      font-weight: 400;
      transition: transform 0.3s;
    }

    .faq-item.active .faq-question::after {
      content: "−";
      transform: rotate(180deg);
    }

    .faq-answer {
      display: none;
      padding: 0 24px 20px;
      font-size: 0.95rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    .faq-item.active .faq-answer {
      display: block;
    }

    .media-card {
      background: #ffffff;
      border-radius: var(--radius);
      overflow: hidden;
      border: 1px solid var(--border-light);
      box-shadow: var(--shadow-sm);
    }

    .media-card-img-wrap {
      width: 100%;
      height: 220px;
      overflow: hidden;
      background: var(--bg-card-alt);
    }

    .media-card-img-wrap img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      display: block;
      transition: transform 0.4s ease;
    }

    .media-card:hover .media-card-img-wrap img {
      transform: scale(1.05);
    }

    .media-card-body {
      padding: 20px;
    }

    .media-card-title {
      font-size: 1.1rem;
      font-weight: 700;
      margin-bottom: 8px;
    }

    .media-card-desc {
      font-size: 0.9rem;
      color: var(--text-muted);
    }

    .banner-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
      margin-top: 32px;
    }

    .banner-grid-item {
      border-radius: var(--radius);
      overflow: hidden;
      border: 1px solid var(--border-light);
      box-shadow: var(--shadow-sm);
    }

    .banner-grid-item img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      display: block;
      transition: transform 0.3s;
    }

    .banner-grid-item img:hover {
      transform: scale(1.04);
    }

    .testimonial-card {
      background: #ffffff;
      border-radius: var(--radius);
      border: 1px solid var(--border-light);
      padding: 24px;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }

    .testimonial-user {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .user-avatar-text {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: var(--gradient-brand);
      color: #ffffff;
      font-weight: 700;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1rem;
    }

    .user-meta-name {
      font-size: 1rem;
      font-weight: 700;
      color: var(--text-main);
    }

    .user-meta-role {
      font-size: 0.85rem;
      color: var(--text-muted);
    }

    .form-container {
      background: #ffffff;
      border-radius: var(--radius);
      border: 1px solid var(--border-light);
      padding: 40px;
      box-shadow: var(--shadow-sm);
      max-width: 800px;
      margin: 0 auto;
    }

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

    .form-label {
      display: block;
      margin-bottom: 8px;
      font-size: 0.95rem;
      font-weight: 600;
      color: var(--text-main);
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      border-radius: 8px;
      border: 1px solid var(--border-light);
      background: var(--bg-card-alt);
      font-size: 0.95rem;
      color: var(--text-main);
      transition: border-color 0.25s;
    }

    .form-control:focus {
      outline: none;
      border-color: var(--neon-cyan);
      background: #ffffff;
    }

    .form-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 20px;
    }

    .contact-wrapper {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 36px;
      align-items: center;
    }

    .contact-card {
      background: #ffffff;
      border-radius: var(--radius);
      border: 1px solid var(--border-light);
      padding: 32px;
      box-shadow: var(--shadow-sm);
    }

    .contact-item {
      display: flex;
      align-items: flex-start;
      gap: 16px;
      margin-bottom: 20px;
    }

    .contact-item-icon {
      font-size: 1.25rem;
      color: #7928ca;
    }

    .contact-qr {
      text-align: center;
      margin-top: 20px;
      padding-top: 20px;
      border-top: 1px dashed var(--border-light);
    }

    .contact-qr img {
      width: 140px;
      height: 140px;
      border-radius: 8px;
      border: 1px solid var(--border-light);
      padding: 4px;
      background: #ffffff;
    }

    .articles-list {
      list-style: none;
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 16px;
    }

    .article-item a {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 16px 20px;
      background: #ffffff;
      border: 1px solid var(--border-light);
      border-radius: 8px;
      text-decoration: none;
      color: var(--text-main);
      transition: all 0.25s ease;
      font-size: 0.95rem;
      font-weight: 500;
    }

    .article-item a:hover {
      border-color: var(--neon-cyan);
      transform: translateX(4px);
      color: #7928ca;
    }

    .footer-site {
      background: #ffffff;
      border-top: 1px solid var(--border-light);
      padding: 50px 0 30px;
    }

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

    .footer-desc {
      font-size: 0.9rem;
      color: var(--text-muted);
      margin-top: 14px;
      line-height: 1.6;
    }

    .footer-col-title {
      font-size: 1rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 16px;
    }

    .footer-links-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .footer-links-list a {
      color: var(--text-muted);
      text-decoration: none;
      font-size: 0.9rem;
      transition: color 0.25s;
    }

    .footer-links-list a:hover {
      color: #7928ca;
    }

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

    .friend-links-wrap a {
      color: var(--text-muted);
      text-decoration: none;
      font-size: 0.85rem;
      background: var(--bg-card-alt);
      padding: 4px 10px;
      border-radius: 4px;
      transition: all 0.25s;
    }

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

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

    .floating-tools {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .float-btn {
      width: 48px;
      height: 48px;
      background: #ffffff;
      border: 1px solid var(--border-glow);
      border-radius: 50%;
      box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
      display: flex;
      align-items: center;
      justify-content: center;
      color: #7928ca;
      font-size: 1.1rem;
      text-decoration: none;
      cursor: pointer;
      transition: transform 0.25s, background 0.25s;
    }

    .float-btn:hover {
      transform: scale(1.1);
      background: var(--bg-card-alt);
    }

    @media (max-width: 992px) {
      .grid-4, .hero-metrics, .banner-grid, .process-timeline {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
      .contact-wrapper, .footer-grid {
        grid-template-columns: 1fr;
      }
      .menu-toggle {
        display: block;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #ffffff;
        flex-direction: column;
        padding: 20px;
        border-bottom: 1px solid var(--border-light);
        box-shadow: 0 8px 20px rgba(0, 0, 0, 0.06);
      }
      .nav-links.active {
        display: flex;
      }
    }

    @media (max-width: 768px) {
      .hero-title {
        font-size: 2rem;
      }
      .grid-2, .grid-3, .grid-4, .hero-metrics, .banner-grid, .process-timeline, .articles-list, .form-grid {
        grid-template-columns: 1fr;
      }
      .form-container {
        padding: 24px;
      }
    }