:root {
      --primary-purple: #7026e3;
      --deep-purple: #4c1192;
      --bright-violet: #8b3ff0;
      --neon-magenta: #c026d3;
      --soft-purple-bg: #f8f5ff;
      --border-purple: #e9dcfc;
      --text-main: #1e152d;
      --text-muted: #5e546d;
      --text-light: #897d9e;
      --card-bg: #ffffff;
      --card-shadow: 0 10px 30px rgba(112, 38, 227, 0.07);
      --card-shadow-hover: 0 15px 35px rgba(112, 38, 227, 0.14);
      --container-width: 1200px;
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
    }

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

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

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--soft-purple-bg);
      background-image: 
        radial-gradient(at 10% 10%, rgba(139, 63, 240, 0.06) 0px, transparent 60%),
        radial-gradient(at 90% 90%, rgba(192, 38, 211, 0.05) 0px, transparent 60%);
      background-attachment: fixed;
      color: var(--text-main);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }

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

    .container {
      width: 100%;
      max-width: var(--container-width);
      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, 0.92);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-purple);
    }

    .nav-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 74px;
    }

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

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

    .brand-title {
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--deep-purple);
      letter-spacing: -0.5px;
    }

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

    .nav-links a {
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--text-muted);
      padding: 8px 12px;
      border-radius: var(--radius-sm);
    }

    .nav-links a:hover {
      color: var(--primary-purple);
      background: rgba(112, 38, 227, 0.06);
    }

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-size: 0.95rem;
      font-weight: 600;
      padding: 10px 22px;
      border-radius: 50px;
      cursor: pointer;
      transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
      border: 1px solid transparent;
      text-align: center;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--bright-violet), var(--neon-magenta));
      color: #ffffff;
      box-shadow: 0 4px 16px rgba(139, 63, 240, 0.35);
    }

    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(139, 63, 240, 0.45);
      color: #ffffff;
    }

    .btn-secondary {
      background: #ffffff;
      color: var(--primary-purple);
      border-color: var(--border-purple);
    }

    .btn-secondary:hover {
      background: var(--soft-purple-bg);
      border-color: var(--primary-purple);
      transform: translateY(-2px);
    }

    .menu-toggle {
      display: none;
      background: none;
      border: none;
      cursor: pointer;
      padding: 8px;
    }

    .menu-toggle span {
      display: block;
      width: 24px;
      height: 2px;
      background: var(--text-main);
      margin: 5px 0;
      transition: all 0.3s ease;
    }

    .hero-section {
      position: relative;
      padding: 70px 0 60px;
      text-align: center;
      overflow: hidden;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 18px;
      background: rgba(112, 38, 227, 0.08);
      border: 1px solid rgba(112, 38, 227, 0.2);
      border-radius: 50px;
      font-size: 0.88rem;
      font-weight: 600;
      color: var(--primary-purple);
      margin-bottom: 24px;
    }

    .hero-title {
      font-size: 2.8rem;
      line-height: 1.25;
      font-weight: 800;
      color: var(--deep-purple);
      margin-bottom: 20px;
      letter-spacing: -1px;
    }

    .hero-subtitle {
      font-size: 1.15rem;
      color: var(--text-muted);
      max-width: 800px;
      margin: 0 auto 36px;
      font-weight: 400;
    }

    .hero-actions {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 48px;
    }

    .hero-stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 18px;
      margin-top: 20px;
    }

    .stat-card {
      background: #ffffff;
      border: 1px solid var(--border-purple);
      border-radius: var(--radius-md);
      padding: 24px 16px;
      box-shadow: var(--card-shadow);
      transition: transform 0.25s ease;
    }

    .stat-card:hover {
      transform: translateY(-4px);
    }

    .stat-num {
      font-size: 2rem;
      font-weight: 800;
      color: var(--primary-purple);
      display: block;
      margin-bottom: 4px;
    }

    .stat-label {
      font-size: 0.88rem;
      color: var(--text-muted);
      font-weight: 500;
    }

    .section-wrap {
      padding: 70px 0;
    }

    .section-head {
      text-align: center;
      margin-bottom: 48px;
    }

    .section-subtag {
      font-size: 0.85rem;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 1.5px;
      color: var(--bright-violet);
      margin-bottom: 8px;
      display: block;
    }

    .section-heading {
      font-size: 2rem;
      font-weight: 800;
      color: var(--deep-purple);
      margin-bottom: 12px;
    }

    .section-desc {
      font-size: 1rem;
      color: var(--text-muted);
      max-width: 680px;
      margin: 0 auto;
    }

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

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

    .card-grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }

    .feature-card {
      background: var(--card-bg);
      border: 1px solid var(--border-purple);
      border-radius: var(--radius-md);
      padding: 28px;
      box-shadow: var(--card-shadow);
      transition: all 0.3s ease;
      display: flex;
      flex-direction: column;
      justify-content: flex-start;
    }

    .feature-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--card-shadow-hover);
      border-color: rgba(139, 63, 240, 0.4);
    }

    .feature-icon-badge {
      width: 48px;
      height: 48px;
      border-radius: 12px;
      background: linear-gradient(135deg, rgba(112, 38, 227, 0.1), rgba(192, 38, 211, 0.15));
      color: var(--primary-purple);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1.1rem;
      margin-bottom: 20px;
    }

    .feature-card h3 {
      font-size: 1.2rem;
      color: var(--deep-purple);
      margin-bottom: 10px;
      font-weight: 700;
    }

    .feature-card p {
      font-size: 0.93rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    .media-card {
      background: #ffffff;
      border: 1px solid var(--border-purple);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--card-shadow);
      transition: transform 0.3s ease;
    }

    .media-card:hover {
      transform: translateY(-4px);
    }

    .media-card .img-box {
      width: 100%;
      aspect-ratio: 16 / 9;
      overflow: hidden;
      background: #eee;
    }

    .media-card.square .img-box {
      aspect-ratio: 1 / 1;
    }

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

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

    .media-content {
      padding: 20px;
    }

    .media-content h3 {
      font-size: 1.1rem;
      color: var(--deep-purple);
      margin-bottom: 8px;
    }

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

    .tag-cloud-box {
      background: #ffffff;
      border: 1px solid var(--border-purple);
      border-radius: var(--radius-lg);
      padding: 32px;
      box-shadow: var(--card-shadow);
      margin-bottom: 40px;
    }

    .tag-list {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      margin-top: 16px;
    }

    .model-tag {
      padding: 8px 16px;
      background: var(--soft-purple-bg);
      border: 1px solid var(--border-purple);
      border-radius: 30px;
      font-size: 0.88rem;
      color: var(--deep-purple);
      font-weight: 500;
      transition: all 0.2s ease;
    }

    .model-tag:hover {
      background: var(--primary-purple);
      color: #ffffff;
      border-color: var(--primary-purple);
    }

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

    .process-node {
      background: #ffffff;
      border: 1px solid var(--border-purple);
      border-radius: var(--radius-md);
      padding: 24px;
      position: relative;
      box-shadow: var(--card-shadow);
    }

    .step-badge {
      font-size: 0.85rem;
      font-weight: 800;
      color: var(--bright-violet);
      margin-bottom: 8px;
      display: block;
    }

    .process-node h3 {
      font-size: 1.1rem;
      color: var(--deep-purple);
      margin-bottom: 8px;
    }

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

    .table-container {
      background: #ffffff;
      border: 1px solid var(--border-purple);
      border-radius: var(--radius-lg);
      overflow-x: auto;
      box-shadow: var(--card-shadow);
    }

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

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

    .custom-table th {
      background: rgba(112, 38, 227, 0.05);
      color: var(--deep-purple);
      font-weight: 700;
    }

    .custom-table tr:hover td {
      background: rgba(112, 38, 227, 0.02);
    }

    .highlight-cell {
      color: var(--primary-purple);
      font-weight: 700;
    }

    .rating-badge {
      display: inline-block;
      padding: 4px 10px;
      background: #fef3c7;
      color: #b45309;
      border-radius: 4px;
      font-weight: 700;
      font-size: 0.85rem;
    }

    .faq-wrapper {
      max-width: 860px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-purple);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--card-shadow);
    }

    .faq-question {
      padding: 18px 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      font-weight: 600;
      color: var(--deep-purple);
      user-select: none;
      transition: background 0.2s ease;
    }

    .faq-question:hover {
      background: rgba(112, 38, 227, 0.03);
    }

    .faq-question::after {
      content: "+";
      font-size: 1.4rem;
      font-weight: 400;
      color: var(--primary-purple);
      transition: transform 0.25s ease;
    }

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

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      background: #faf8ff;
      color: var(--text-muted);
      font-size: 0.93rem;
      line-height: 1.65;
    }

    .faq-item.active .faq-answer {
      max-height: 250px;
      padding: 16px 24px 20px;
      border-top: 1px solid var(--border-purple);
    }

    .review-card {
      background: #ffffff;
      border: 1px solid var(--border-purple);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--card-shadow);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .review-header {
      display: flex;
      align-items: center;
      gap: 14px;
      margin-bottom: 14px;
    }

    .user-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--bright-violet), var(--neon-magenta));
      color: #ffffff;
      font-weight: 700;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.1rem;
    }

    .user-info h4 {
      font-size: 0.98rem;
      color: var(--deep-purple);
      margin-bottom: 2px;
    }

    .user-info p {
      font-size: 0.82rem;
      color: var(--text-light);
    }

    .review-text {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.6;
      font-style: italic;
    }

    .form-wrapper {
      max-width: 640px;
      margin: 0 auto;
      background: #ffffff;
      border: 1px solid var(--border-purple);
      border-radius: var(--radius-lg);
      padding: 36px;
      box-shadow: var(--card-shadow);
    }

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

    .form-group label {
      display: block;
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--deep-purple);
      margin-bottom: 8px;
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid var(--border-purple);
      border-radius: var(--radius-sm);
      font-size: 0.95rem;
      color: var(--text-main);
      outline: none;
      transition: border-color 0.2s ease, box-shadow 0.2s ease;
      background: #fdfcff;
    }

    .form-control:focus {
      border-color: var(--bright-violet);
      box-shadow: 0 0 0 3px rgba(139, 63, 240, 0.15);
      background: #ffffff;
    }

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

    .site-footer {
      background: #ffffff;
      border-top: 1px solid var(--border-purple);
      padding: 50px 0 24px;
      color: var(--text-muted);
      font-size: 0.9rem;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 30px;
      margin-bottom: 40px;
    }

    .footer-col h4 {
      font-size: 1rem;
      color: var(--deep-purple);
      margin-bottom: 16px;
      font-weight: 700;
    }

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

    .footer-col ul li {
      margin-bottom: 8px;
    }

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

    .qr-box {
      max-width: 110px;
      border-radius: var(--radius-sm);
      border: 1px solid var(--border-purple);
      padding: 4px;
      background: #ffffff;
      margin-top: 8px;
    }

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

    .footer-bottom {
      border-top: 1px solid var(--border-purple);
      padding-top: 20px;
      text-align: center;
      font-size: 0.85rem;
      color: var(--text-light);
    }

    .friend-links-box {
      padding: 16px 0;
      border-top: 1px solid var(--border-purple);
      margin-bottom: 20px;
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 14px;
      font-size: 0.88rem;
    }

    .friend-links-box a {
      color: var(--text-muted);
    }

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

    .float-service-bar {
      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(--card-bg);
      border: 1px solid var(--border-purple);
      box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      color: var(--primary-purple);
      font-weight: 700;
      font-size: 1.1rem;
      transition: all 0.25s ease;
      position: relative;
    }

    .float-btn:hover {
      transform: scale(1.08);
      background: var(--primary-purple);
      color: #ffffff;
    }

    .float-qr-popover {
      display: none;
      position: absolute;
      right: 58px;
      bottom: 0;
      background: #ffffff;
      border: 1px solid var(--border-purple);
      border-radius: var(--radius-sm);
      padding: 10px;
      box-shadow: var(--card-shadow-hover);
      width: 140px;
      text-align: center;
    }

    .float-qr-popover img {
      width: 100%;
      height: auto;
      display: block;
      border-radius: 4px;
    }

    .float-qr-popover span {
      display: block;
      font-size: 0.78rem;
      color: var(--deep-purple);
      margin-top: 6px;
      font-weight: 600;
    }

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

    @media (max-width: 992px) {
      .hero-title {
        font-size: 2.2rem;
      }
      .card-grid-4 {
        grid-template-columns: repeat(2, 1fr);
      }
      .card-grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
      .process-timeline {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 768px) {
      .menu-toggle {
        display: block;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 74px;
        left: 0;
        width: 100%;
        background: #ffffff;
        flex-direction: column;
        padding: 20px;
        box-shadow: 0 10px 20px rgba(0,0,0,0.05);
        border-bottom: 1px solid var(--border-purple);
      }
      .nav-links.show {
        display: flex;
      }
      .nav-links a {
        width: 100%;
        padding: 10px;
      }
      .nav-cta-group .btn-secondary {
        display: none;
      }
      .hero-title {
        font-size: 1.8rem;
      }
      .hero-stats-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .card-grid-3, .card-grid-4, .card-grid-2 {
        grid-template-columns: 1fr;
      }
      .process-timeline {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }