:root {
      --primary-purple: #7928ca;
      --primary-gradient: linear-gradient(135deg, #7928ca 0%, #ff0080 100%);
      --light-purple-bg: #fbf9ff;
      --card-bg: #ffffff;
      --text-main: #1f1b2d;
      --text-muted: #5e5873;
      --border-color: #ede7f6;
      --accent-glow: rgba(121, 40, 202, 0.12);
      --accent-hover: #621ba5;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--light-purple-bg);
      color: var(--text-main);
      line-height: 1.6;
      overflow-x: hidden;
    }
    .site-wrapper {
      max-width: 1240px;
      margin: 0 auto;
      padding: 0 20px;
    }
    header.site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(10px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: 0 4px 20px rgba(121, 40, 202, 0.05);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .brand-box {
      display: flex;
      align-items: center;
      gap: 12px;
      text-decoration: none;
      color: var(--text-main);
    }
    .brand-box .ai-page-logo {
      height: 38px;
      width: auto;
      display: block;
    }
    .brand-title {
      font-size: 1.25rem;
      font-weight: 700;
      background: var(--primary-gradient);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
      list-style: none;
    }
    .nav-links li {
      margin: 0 6px;
    }
    .nav-links a {
      text-decoration: none;
      color: var(--text-muted);
      font-size: 0.92rem;
      font-weight: 500;
      padding: 8px 10px;
      border-radius: 6px;
      transition: all 0.25s ease;
    }
    .nav-links a:hover {
      color: var(--primary-purple);
      background-color: var(--accent-glow);
    }
    .header-actions {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .btn-primary {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      background: var(--primary-gradient);
      color: #ffffff;
      text-decoration: none;
      font-size: 0.95rem;
      font-weight: 600;
      border-radius: 8px;
      border: none;
      cursor: pointer;
      box-shadow: 0 4px 14px rgba(121, 40, 202, 0.3);
      transition: transform 0.2s ease, box-shadow 0.2s ease;
    }
    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(121, 40, 202, 0.45);
    }
    .btn-outline {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 9px 20px;
      background: transparent;
      color: var(--primary-purple);
      text-decoration: none;
      font-size: 0.95rem;
      font-weight: 600;
      border-radius: 8px;
      border: 1.5px solid var(--primary-purple);
      cursor: pointer;
      transition: all 0.25s ease;
    }
    .btn-outline:hover {
      background: var(--accent-glow);
    }
    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      font-size: 1.5rem;
      color: var(--text-main);
      cursor: pointer;
    }
    .hero-section {
      padding: 80px 0 60px;
      text-align: center;
      background: radial-gradient(circle at 50% 30%, rgba(255, 0, 128, 0.08) 0%, rgba(121, 40, 202, 0.04) 50%, transparent 70%);
      border-bottom: 1px solid var(--border-color);
    }
    .hero-badge {
      display: inline-block;
      padding: 6px 16px;
      background: rgba(121, 40, 202, 0.08);
      border: 1px solid rgba(121, 40, 202, 0.2);
      border-radius: 30px;
      color: var(--primary-purple);
      font-size: 0.88rem;
      font-weight: 600;
      margin-bottom: 24px;
    }
    .hero-title {
      font-size: 2.75rem;
      line-height: 1.25;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }
    .hero-title span {
      background: var(--primary-gradient);
      -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;
      flex-wrap: wrap;
      margin-bottom: 50px;
    }
    .hero-metrics {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      max-width: 1040px;
      margin: 0 auto;
    }
    .metric-box {
      background: #ffffff;
      padding: 24px;
      border-radius: 14px;
      border: 1px solid var(--border-color);
      box-shadow: 0 10px 30px rgba(121, 40, 202, 0.05);
      transition: transform 0.3s ease;
    }
    .metric-box:hover {
      transform: translateY(-4px);
    }
    .metric-value {
      font-size: 2rem;
      font-weight: 800;
      color: var(--primary-purple);
      margin-bottom: 6px;
    }
    .metric-label {
      font-size: 0.9rem;
      color: var(--text-muted);
      font-weight: 500;
    }
    .section-block {
      padding: 70px 0;
      border-bottom: 1px solid var(--border-color);
    }
    .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: var(--primary-purple);
      margin-bottom: 8px;
    }
    .section-title {
      font-size: 2rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 12px;
    }
    .section-subtitle {
      font-size: 1rem;
      color: var(--text-muted);
    }
    .models-cloud {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      max-width: 960px;
      margin: 0 auto;
    }
    .model-tag {
      padding: 8px 16px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 20px;
      font-size: 0.88rem;
      color: var(--text-main);
      font-weight: 600;
      box-shadow: 0 2px 6px rgba(0, 0, 0, 0.02);
      transition: all 0.2s ease;
    }
    .model-tag:hover {
      border-color: var(--primary-purple);
      color: var(--primary-purple);
      transform: scale(1.05);
    }
    .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;
    }
    .feature-card {
      background: #ffffff;
      padding: 28px;
      border-radius: 16px;
      border: 1px solid var(--border-color);
      box-shadow: 0 4px 20px rgba(121, 40, 202, 0.04);
      transition: all 0.3s ease;
      display: flex;
      flex-direction: column;
    }
    .feature-card:hover {
      border-color: var(--primary-purple);
      box-shadow: 0 12px 30px rgba(121, 40, 202, 0.12);
      transform: translateY(-5px);
    }
    .feature-icon-box {
      width: 48px;
      height: 48px;
      border-radius: 12px;
      background: var(--accent-glow);
      color: var(--primary-purple);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1.25rem;
      margin-bottom: 20px;
    }
    .feature-card h3 {
      font-size: 1.15rem;
      margin-bottom: 10px;
      color: var(--text-main);
    }
    .feature-card p {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.55;
    }
    .steps-wrapper {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      position: relative;
    }
    .step-box {
      background: #ffffff;
      padding: 24px;
      border-radius: 14px;
      border: 1px solid var(--border-color);
      text-align: center;
      position: relative;
    }
    .step-num {
      width: 36px;
      height: 36px;
      line-height: 36px;
      border-radius: 50%;
      background: var(--primary-gradient);
      color: #ffffff;
      font-weight: 700;
      margin: 0 auto 16px;
    }
    .step-box h3 {
      font-size: 1.05rem;
      margin-bottom: 8px;
    }
    .step-box p {
      font-size: 0.88rem;
      color: var(--text-muted);
    }
    .compare-table-container {
      background: #ffffff;
      border-radius: 16px;
      border: 1px solid var(--border-color);
      box-shadow: 0 10px 30px rgba(121, 40, 202, 0.04);
      overflow-x: auto;
    }
    .compare-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
    }
    .compare-table th, .compare-table td {
      padding: 18px 24px;
      border-bottom: 1px solid var(--border-color);
    }
    .compare-table th {
      background: #faf7fd;
      font-weight: 700;
      color: var(--text-main);
    }
    .highlight-col {
      background: rgba(121, 40, 202, 0.03);
      font-weight: 600;
      color: var(--primary-purple);
    }
    .badge-score {
      display: inline-block;
      padding: 4px 10px;
      background: var(--primary-gradient);
      color: #ffffff;
      border-radius: 20px;
      font-size: 0.82rem;
      font-weight: 700;
      margin-left: 8px;
    }
    .media-case-box {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
      align-items: center;
      margin-bottom: 30px;
      background: #ffffff;
      border-radius: 16px;
      border: 1px solid var(--border-color);
      padding: 24px;
    }
    .media-case-img {
      border-radius: 12px;
      overflow: hidden;
      box-shadow: 0 4px 15px rgba(0, 0, 0, 0.06);
    }
    .media-case-img img {
      width: 100%;
      height: auto;
      display: block;
      transition: transform 0.3s ease;
    }
    .media-case-img img:hover {
      transform: scale(1.02);
    }
    .articles-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }
    .article-card {
      background: #ffffff;
      padding: 20px;
      border-radius: 12px;
      border: 1px solid var(--border-color);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .article-card a {
      text-decoration: none;
      color: var(--text-main);
      font-weight: 600;
      font-size: 0.98rem;
      transition: color 0.2s;
    }
    .article-card a:hover {
      color: var(--primary-purple);
    }
    .article-meta {
      font-size: 0.82rem;
      color: var(--text-muted);
      margin-top: 12px;
    }
    .testimonials-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .testi-card {
      background: #ffffff;
      padding: 24px;
      border-radius: 16px;
      border: 1px solid var(--border-color);
      box-shadow: 0 4px 15px rgba(121, 40, 202, 0.03);
    }
    .testi-header {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 14px;
    }
    .testi-avatar-placeholder {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: var(--accent-glow);
      color: var(--primary-purple);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
    }
    .testi-name {
      font-weight: 700;
      font-size: 0.95rem;
    }
    .testi-role {
      font-size: 0.82rem;
      color: var(--text-muted);
    }
    .testi-quote {
      font-size: 0.9rem;
      color: var(--text-muted);
      line-height: 1.6;
    }
    .faq-container {
      max-width: 900px;
      margin: 0 auto;
    }
    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 12px;
      margin-bottom: 12px;
      overflow: hidden;
    }
    .faq-question {
      padding: 18px 24px;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 600;
      font-size: 1rem;
      user-select: none;
      background: #ffffff;
      color: var(--text-main);
      transition: background-color 0.2s ease;
    }
    .faq-question:hover {
      background: #fbf9ff;
    }
    .faq-icon {
      font-size: 1.25rem;
      color: var(--primary-purple);
      transition: transform 0.3s ease;
    }
    .faq-answer {
      padding: 0 24px 18px;
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.6;
      display: none;
    }
    .faq-item.active .faq-answer {
      display: block;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }
    .form-wrapper {
      background: #ffffff;
      padding: 40px;
      border-radius: 18px;
      border: 1px solid var(--border-color);
      box-shadow: 0 10px 30px rgba(121, 40, 202, 0.05);
      max-width: 760px;
      margin: 0 auto;
    }
    .form-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
      margin-bottom: 20px;
    }
    .form-group-full {
      grid-column: 1 / -1;
      margin-bottom: 20px;
    }
    .form-label {
      display: block;
      font-size: 0.88rem;
      font-weight: 600;
      margin-bottom: 6px;
      color: var(--text-main);
    }
    .form-input, .form-select, .form-textarea {
      width: 100%;
      padding: 12px 14px;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      font-size: 0.92rem;
      color: var(--text-main);
      background: #fbf9ff;
      outline: none;
      transition: border-color 0.2s ease;
    }
    .form-input:focus, .form-select:focus, .form-textarea:focus {
      border-color: var(--primary-purple);
      background: #ffffff;
    }
    .form-textarea {
      resize: vertical;
      min-height: 100px;
    }
    .contact-card-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      margin-top: 40px;
    }
    .contact-item {
      background: #ffffff;
      padding: 20px;
      border-radius: 14px;
      border: 1px solid var(--border-color);
      text-align: center;
    }
    .contact-item img {
      max-width: 120px;
      height: auto;
      border-radius: 8px;
      margin-top: 8px;
    }
    footer.site-footer {
      background: #191426;
      color: #b3acc7;
      padding: 50px 0 30px;
      margin-top: 50px;
      border-top: 3px solid var(--primary-purple);
    }
    .footer-top {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 30px;
      margin-bottom: 40px;
    }
    .footer-col h4 {
      color: #ffffff;
      font-size: 1.05rem;
      margin-bottom: 16px;
    }
    .footer-links {
      list-style: none;
    }
    .footer-links li {
      margin-bottom: 10px;
    }
    .footer-links a {
      color: #b3acc7;
      text-decoration: none;
      font-size: 0.9rem;
      transition: color 0.2s;
    }
    .footer-links a:hover {
      color: #ffffff;
    }
    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.1);
      padding-top: 24px;
      text-align: center;
      font-size: 0.85rem;
    }
    .friend-links-box {
      margin-bottom: 20px;
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 14px;
    }
    .friend-links-box a {
      color: #b3acc7;
      text-decoration: none;
      font-size: 0.85rem;
    }
    .friend-links-box a:hover {
      color: #ff0080;
    }
    .floating-kefu {
      position: fixed;
      right: 20px;
      bottom: 80px;
      z-index: 999;
      background: #ffffff;
      padding: 12px;
      border-radius: 12px;
      border: 1px solid var(--border-color);
      box-shadow: 0 10px 30px rgba(0,0,0,0.15);
      text-align: center;
      width: 110px;
    }
    .floating-kefu img {
      width: 100%;
      height: auto;
      border-radius: 6px;
      display: block;
      margin-bottom: 6px;
    }
    .floating-kefu span {
      font-size: 0.75rem;
      font-weight: 600;
      color: var(--primary-purple);
    }
    @media (max-width: 1024px) {
      .card-grid-4 { grid-template-columns: repeat(2, 1fr); }
      .card-grid-3 { grid-template-columns: repeat(2, 1fr); }
      .hero-metrics { grid-template-columns: repeat(2, 1fr); }
      .steps-wrapper { grid-template-columns: repeat(2, 1fr); }
      .contact-card-grid { grid-template-columns: repeat(2, 1fr); }
      .footer-top { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .nav-links.active {
        display: flex;
        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 var(--border-color);
      }
      .nav-links li { margin: 8px 0; }
      .mobile-menu-btn { display: block; }
      .hero-title { font-size: 1.95rem; }
      .card-grid-3, .card-grid-4, .testimonials-grid, .articles-grid { grid-template-columns: 1fr; }
      .media-case-box { grid-template-columns: 1fr; }
      .hero-metrics, .steps-wrapper, .contact-card-grid { grid-template-columns: 1fr; }
      .form-grid { grid-template-columns: 1fr; }
      .footer-top { grid-template-columns: 1fr; }
      .floating-kefu { display: none; }
    }