:root {
      --primary: #1254eb;
      --primary-hover: #083eb8;
      --accent-coral: #ff5034;
      --accent-yellow: #ffb800;
      --accent-emerald: #0fa968;
      --bg-light: #f6f8fd;
      --bg-card: #ffffff;
      --text-main: #141b2b;
      --text-muted: #58647a;
      --border-color: #e5ebf5;
      --shadow-sm: 0 4px 12px rgba(18, 84, 235, 0.05);
      --shadow-md: 0 10px 28px rgba(18, 84, 235, 0.08);
      --shadow-hover: 0 16px 36px rgba(18, 84, 235, 0.14);
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
    }

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
      -webkit-tap-highlight-color: transparent;
    }

    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(--bg-light);
      color: var(--text-main);
      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;
    }

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

    ul, ol {
      list-style: none;
    }

    img {
      max-width: 100%;
      height: auto;
      display: block;
    }

    .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-color);
      box-shadow: var(--shadow-sm);
    }

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

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

    .nav-brand .ai-page-logo {
      height: 38px;
      width: auto;
    }

    .brand-text {
      font-size: 1.25rem;
      font-weight: 800;
      color: var(--primary);
      letter-spacing: -0.5px;
    }

    .nav-menu {
      display: flex;
      align-items: center;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
    }

    .nav-links li a {
      padding: 8px 12px;
      font-size: 0.92rem;
      font-weight: 500;
      color: var(--text-main);
      border-radius: var(--radius-sm);
    }

    .nav-links li a:hover {
      color: var(--primary);
      background-color: rgba(18, 84, 235, 0.05);
    }

    .nav-cta-group {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-left: 16px;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      font-size: 0.95rem;
      font-weight: 600;
      border-radius: var(--radius-sm);
      cursor: pointer;
      border: 1px solid transparent;
      transition: all 0.25s ease;
      white-space: nowrap;
    }

    .btn-primary {
      background-color: var(--primary);
      color: #ffffff;
      box-shadow: 0 4px 14px rgba(18, 84, 235, 0.28);
    }

    .btn-primary:hover {
      background-color: var(--primary-hover);
      transform: translateY(-2px);
      box-shadow: 0 6px 18px rgba(18, 84, 235, 0.38);
    }

    .btn-accent {
      background-color: var(--accent-coral);
      color: #ffffff;
      box-shadow: 0 4px 14px rgba(255, 80, 52, 0.28);
    }

    .btn-accent:hover {
      background-color: #e23b20;
      transform: translateY(-2px);
      box-shadow: 0 6px 18px rgba(255, 80, 52, 0.38);
    }

    .btn-outline {
      background-color: #ffffff;
      border-color: var(--border-color);
      color: var(--text-main);
    }

    .btn-outline:hover {
      border-color: var(--primary);
      color: var(--primary);
      background-color: rgba(18, 84, 235, 0.04);
    }

    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      font-size: 1.5rem;
      cursor: pointer;
      color: var(--text-main);
      padding: 6px;
    }

    .hero-section {
      padding: 80px 0 60px;
      background: radial-gradient(circle at 80% 20%, rgba(255, 184, 0, 0.12) 0%, transparent 45%),
                  radial-gradient(circle at 10% 60%, rgba(18, 84, 235, 0.08) 0%, transparent 40%),
                  #ffffff;
      border-bottom: 1px solid var(--border-color);
      position: relative;
    }

    .hero-wrapper {
      display: flex;
      flex-direction: column;
      align-items: center;
      text-align: center;
    }

    .hero-badge-row {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 14px;
      background-color: rgba(18, 84, 235, 0.08);
      border: 1px solid rgba(18, 84, 235, 0.2);
      border-radius: 50px;
      margin-bottom: 24px;
    }

    .hero-badge-tag {
      background-color: var(--accent-coral);
      color: #ffffff;
      font-size: 0.75rem;
      font-weight: 700;
      padding: 2px 8px;
      border-radius: 20px;
    }

    .hero-badge-text {
      font-size: 0.88rem;
      font-weight: 600;
      color: var(--primary);
    }

    .hero-title {
      font-size: 2.75rem;
      line-height: 1.25;
      font-weight: 900;
      color: var(--text-main);
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }

    .hero-title-highlight {
      color: var(--primary);
      position: relative;
    }

    .hero-subtitle {
      font-size: 1.15rem;
      color: var(--text-muted);
      max-width: 780px;
      margin-bottom: 36px;
      line-height: 1.7;
    }

    .hero-action-buttons {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 50px;
    }

    .hero-metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      width: 100%;
    }

    .metric-card {
      background-color: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px 20px;
      box-shadow: var(--shadow-sm);
      text-align: center;
      transition: transform 0.25s ease, box-shadow 0.25s ease;
      position: relative;
      overflow: hidden;
    }

    .metric-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }

    .metric-card::before {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      height: 4px;
      background: linear-gradient(90deg, var(--primary), var(--accent-coral));
    }

    .metric-value {
      font-size: 2rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 6px;
    }

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

    .section {
      padding: 80px 0;
      position: relative;
    }

    .section-header {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 50px;
    }

    .section-tag {
      display: inline-block;
      font-size: 0.85rem;
      font-weight: 700;
      color: var(--primary);
      text-transform: uppercase;
      letter-spacing: 1px;
      margin-bottom: 10px;
      background: rgba(18, 84, 235, 0.08);
      padding: 4px 12px;
      border-radius: 20px;
    }

    .section-title {
      font-size: 2.15rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 16px;
      line-height: 1.3;
    }

    .section-desc {
      font-size: 1rem;
      color: var(--text-muted);
      line-height: 1.7;
    }

    .about-box {
      background-color: var(--bg-card);
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      padding: 44px;
      box-shadow: var(--shadow-sm);
    }

    .about-features {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin-top: 36px;
    }

    .feature-item {
      padding: 24px;
      background: #fdfdfe;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      transition: all 0.25s ease;
    }

    .feature-item:hover {
      border-color: var(--primary);
      box-shadow: var(--shadow-sm);
      transform: translateY(-2px);
    }

    .feature-title {
      font-size: 1.15rem;
      font-weight: 700;
      margin-bottom: 10px;
      color: var(--text-main);
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .feature-icon {
      width: 28px;
      height: 28px;
      border-radius: 6px;
      background-color: rgba(18, 84, 235, 0.1);
      color: var(--primary);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-size: 0.9rem;
      font-weight: 800;
    }

    .feature-desc {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

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

    .service-card {
      background-color: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px;
      box-shadow: var(--shadow-sm);
      transition: all 0.25s ease;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .service-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-hover);
      border-color: rgba(18, 84, 235, 0.3);
    }

    .service-tag {
      font-size: 0.75rem;
      font-weight: 700;
      color: var(--accent-coral);
      background-color: rgba(255, 80, 52, 0.08);
      padding: 3px 8px;
      border-radius: 4px;
      display: inline-block;
      margin-bottom: 12px;
      align-self: flex-start;
    }

    .service-title {
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 12px;
    }

    .service-desc {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.65;
      margin-bottom: 18px;
    }

    .model-tags-row {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      margin-top: 30px;
      justify-content: center;
    }

    .model-pill {
      background: #ffffff;
      border: 1px solid var(--border-color);
      padding: 6px 14px;
      font-size: 0.85rem;
      font-weight: 600;
      color: var(--text-main);
      border-radius: 50px;
      box-shadow: var(--shadow-sm);
    }

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

    .step-box {
      background-color: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      position: relative;
    }

    .step-number {
      font-size: 2.2rem;
      font-weight: 900;
      color: rgba(18, 84, 235, 0.15);
      line-height: 1;
      margin-bottom: 12px;
    }

    .step-title {
      font-size: 1.1rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 8px;
    }

    .step-desc {
      font-size: 0.88rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

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

    .case-card {
      background-color: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
    }

    .case-media-container {
      width: 100%;
      aspect-ratio: 16 / 10;
      overflow: hidden;
      background-color: #eef2f7;
    }

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

    .case-card:hover .case-media-container img {
      transform: scale(1.04);
    }

    .case-info {
      padding: 20px;
      flex-grow: 1;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .case-title {
      font-size: 1.15rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 8px;
    }

    .case-desc {
      font-size: 0.88rem;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 12px;
    }

    .comparison-section-box {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 36px;
      box-shadow: var(--shadow-sm);
    }

    .rating-banner {
      background: linear-gradient(135deg, rgba(18, 84, 235, 0.06), rgba(255, 80, 52, 0.06));
      border: 1px dashed var(--primary);
      border-radius: var(--radius-md);
      padding: 20px 24px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 16px;
      margin-bottom: 30px;
    }

    .rating-score-highlight {
      font-size: 1.8rem;
      font-weight: 900;
      color: var(--accent-coral);
    }

    .table-container {
      width: 100%;
      overflow-x: auto;
    }

    .comparison-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 600px;
    }

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

    .comparison-table th {
      background-color: var(--bg-light);
      font-weight: 700;
      color: var(--text-main);
    }

    .comparison-table td.highlight-col {
      background-color: rgba(18, 84, 235, 0.03);
      font-weight: 700;
      color: var(--primary);
    }

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

    .token-card {
      background-color: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px;
      text-align: center;
      transition: all 0.25s ease;
      position: relative;
    }

    .token-card.featured {
      border-color: var(--primary);
      box-shadow: var(--shadow-hover);
    }

    .token-card.featured::after {
      content: "超高性价比";
      position: absolute;
      top: -12px;
      right: 20px;
      background: var(--accent-coral);
      color: #fff;
      font-size: 0.75rem;
      font-weight: 700;
      padding: 2px 10px;
      border-radius: 20px;
    }

    .token-price {
      font-size: 2.2rem;
      font-weight: 800;
      color: var(--primary);
      margin: 16px 0;
    }

    .token-price span {
      font-size: 0.9rem;
      font-weight: normal;
      color: var(--text-muted);
    }

    .token-features-list {
      text-align: left;
      margin-bottom: 24px;
    }

    .token-features-list li {
      padding: 6px 0;
      font-size: 0.9rem;
      color: var(--text-muted);
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .form-wrapper {
      background-color: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 40px;
      max-width: 800px;
      margin: 0 auto;
      box-shadow: var(--shadow-sm);
    }

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

    .form-full {
      grid-column: span 2;
    }

    .form-group {
      display: flex;
      flex-direction: column;
      gap: 8px;
    }

    .form-label {
      font-size: 0.92rem;
      font-weight: 600;
      color: var(--text-main);
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      font-size: 0.95rem;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      background-color: #fafbfc;
      color: var(--text-main);
      transition: border-color 0.25s ease;
    }

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

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

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

    .review-card {
      background-color: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--shadow-sm);
    }

    .reviewer-info {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 14px;
    }

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

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

    .reviewer-role {
      font-size: 0.8rem;
      color: var(--text-muted);
    }

    .review-text {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.65;
    }

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

    .faq-item {
      background-color: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      transition: all 0.25s ease;
    }

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

    .faq-question:hover {
      color: var(--primary);
    }

    .faq-icon {
      font-size: 1.25rem;
      transition: transform 0.25s ease;
      color: var(--primary);
    }

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

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      background-color: #fafbfc;
      color: var(--text-muted);
      font-size: 0.92rem;
      line-height: 1.7;
    }

    .faq-item.active .faq-answer {
      max-height: 300px;
      padding: 16px 24px;
      border-top: 1px solid var(--border-color);
    }

    .articles-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }

    .article-card {
      background-color: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 20px;
      box-shadow: var(--shadow-sm);
      transition: all 0.25s ease;
    }

    .article-card:hover {
      border-color: var(--primary);
      transform: translateY(-3px);
    }

    .article-title {
      font-size: 1.05rem;
      font-weight: 700;
      margin-bottom: 10px;
      line-height: 1.4;
      color: var(--text-main);
    }

    .article-card:hover .article-title {
      color: var(--primary);
    }

    .article-link {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      font-size: 0.85rem;
      color: var(--primary);
      font-weight: 600;
    }

    .site-footer {
      background-color: #ffffff;
      border-top: 1px solid var(--border-color);
      padding: 60px 0 30px;
      color: var(--text-main);
    }

    .footer-top-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 36px;
      margin-bottom: 40px;
    }

    .footer-col h4 {
      font-size: 1.05rem;
      font-weight: 700;
      margin-bottom: 16px;
      color: var(--text-main);
    }

    .footer-links-list li {
      margin-bottom: 10px;
    }

    .footer-links-list a {
      color: var(--text-muted);
      font-size: 0.9rem;
    }

    .footer-links-list a:hover {
      color: var(--primary);
    }

    .qr-box {
      width: 110px;
      height: 110px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      padding: 6px;
      background: #ffffff;
      margin-top: 10px;
    }

    .qr-box img {
      width: 100%;
      height: 100%;
      object-fit: contain;
    }

    .friend-links-box {
      padding-top: 24px;
      border-top: 1px solid var(--border-color);
      margin-bottom: 24px;
    }

    .friend-links-title {
      font-size: 0.88rem;
      font-weight: 700;
      color: var(--text-muted);
      margin-bottom: 10px;
    }

    .friend-links-wrap {
      display: flex;
      flex-wrap: wrap;
      gap: 14px;
    }

    .friend-links-wrap a {
      font-size: 0.85rem;
      color: var(--text-muted);
    }

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

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

    .floating-bar {
      position: fixed;
      right: 20px;
      bottom: 40px;
      display: flex;
      flex-direction: column;
      gap: 10px;
      z-index: 999;
    }

    .floating-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background-color: #ffffff;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-md);
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      color: var(--primary);
      font-size: 1.2rem;
      transition: all 0.25s ease;
      position: relative;
    }

    .floating-btn:hover {
      background-color: var(--primary);
      color: #ffffff;
      transform: translateY(-3px);
    }

    .floating-tooltip {
      position: absolute;
      right: 58px;
      top: 50%;
      transform: translateY(-50%);
      background-color: #ffffff;
      padding: 12px;
      border-radius: var(--radius-sm);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-md);
      display: none;
      width: 140px;
      text-align: center;
      color: var(--text-main);
      font-size: 0.8rem;
    }

    .floating-btn:hover .floating-tooltip {
      display: block;
    }

    @media (max-width: 992px) {
      .hero-title {
        font-size: 2.2rem;
      }
      .hero-metrics-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .about-features, .services-grid, .token-grid, .reviews-grid, .articles-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .workflow-steps {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-top-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .mobile-menu-btn {
        display: block;
      }
      .nav-menu {
        position: absolute;
        top: 74px;
        left: 0;
        right: 0;
        background: #ffffff;
        border-bottom: 1px solid var(--border-color);
        padding: 20px;
        flex-direction: column;
        align-items: flex-start;
        display: none;
        box-shadow: var(--shadow-md);
      }
      .nav-menu.open {
        display: flex;
      }
      .nav-links {
        flex-direction: column;
        align-items: flex-start;
        width: 100%;
      }
      .nav-links li {
        width: 100%;
      }
      .nav-links li a {
        display: block;
        padding: 10px 0;
        border-bottom: 1px solid rgba(0,0,0,0.04);
      }
      .nav-cta-group {
        margin-left: 0;
        margin-top: 16px;
        width: 100%;
        flex-direction: column;
      }
      .nav-cta-group a {
        width: 100%;
      }
    }

    @media (max-width: 640px) {
      .hero-title {
        font-size: 1.8rem;
      }
      .section-title {
        font-size: 1.6rem;
      }
      .hero-metrics-grid, .about-features, .services-grid, .token-grid, .reviews-grid, .articles-grid, .cases-grid, .workflow-steps, .form-grid {
        grid-template-columns: 1fr;
      }
      .form-full {
        grid-column: span 1;
      }
      .footer-top-grid {
        grid-template-columns: 1fr;
      }
      .hero-action-buttons {
        flex-direction: column;
        width: 100%;
      }
      .hero-action-buttons .btn {
        width: 100%;
      }
      .rating-banner {
        flex-direction: column;
        align-items: flex-start;
      }
    }