:root {
      --primary: #5c35f7;
      --primary-hover: #4823db;
      --secondary: #ff3377;
      --accent: #00d2b4;
      --warm-accent: #ff8a00;
      --bg-page: #f8fafc;
      --bg-surface: #ffffff;
      --text-main: #131722;
      --text-muted: #525a6c;
      --border-color: #e5e9f2;
      --radius-sm: 8px;
      --radius-md: 16px;
      --radius-lg: 24px;
      --shadow-sm: 0 4px 12px rgba(92, 53, 247, 0.05);
      --shadow-hover: 0 12px 30px rgba(92, 53, 247, 0.14);
      --transition-fast: 0.25s ease;
    }

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

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

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-page);
      color: var(--text-main);
      line-height: 1.6;
      overflow-x: hidden;
      background-image: 
        radial-gradient(circle at 10% 20%, rgba(92, 53, 247, 0.03) 0%, transparent 40%),
        radial-gradient(circle at 90% 80%, rgba(255, 51, 119, 0.03) 0%, transparent 40%);
    }

    a {
      color: inherit;
      text-decoration: none;
      transition: color var(--transition-fast);
    }

    ul, ol {
      list-style: none;
    }

    .container {
      width: 100%;
      max-width: 1240px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 顶部导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(255, 255, 255, 0.94);
      backdrop-filter: blur(16px);
      border-bottom: 1px solid var(--border-color);
      transition: all var(--transition-fast);
    }

    .navbar {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 76px;
    }

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

    .ai-page-logo {
      height: 42px;
      width: auto;
      display: block;
    }

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

    .nav-links a {
      font-size: 15px;
      font-weight: 600;
      color: var(--text-main);
      padding: 8px 14px;
      border-radius: var(--radius-sm);
      display: inline-block;
    }

    .nav-links a:hover {
      color: var(--primary);
      background: rgba(92, 53, 247, 0.05);
    }

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 11px 22px;
      font-size: 15px;
      font-weight: 600;
      border-radius: 40px;
      cursor: pointer;
      border: 1px solid transparent;
      transition: all var(--transition-fast);
      text-align: center;
      line-height: 1.2;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--primary) 0%, #7d52ff 100%);
      color: #ffffff;
      box-shadow: 0 4px 15px rgba(92, 53, 247, 0.3);
    }

    .btn-primary:hover {
      background: linear-gradient(135deg, var(--primary-hover) 0%, #683be8 100%);
      transform: translateY(-2px);
      box-shadow: 0 8px 20px rgba(92, 53, 247, 0.4);
      color: #ffffff;
    }

    .btn-outline {
      background: #ffffff;
      color: var(--primary);
      border-color: rgba(92, 53, 247, 0.3);
    }

    .btn-outline:hover {
      background: rgba(92, 53, 247, 0.05);
      border-color: var(--primary);
      transform: translateY(-2px);
    }

    .mobile-menu-toggle {
      display: none;
      background: transparent;
      border: none;
      font-size: 24px;
      cursor: pointer;
      color: var(--text-main);
    }

    /* 核心视觉区块通配 */
    .section-spacing {
      padding: 80px 0;
      border-bottom: 1px solid rgba(229, 233, 242, 0.7);
    }

    .section-header {
      text-align: center;
      max-width: 800px;
      margin: 0 auto 52px auto;
    }

    .section-badge {
      display: inline-block;
      padding: 6px 16px;
      font-size: 13px;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.5px;
      color: var(--primary);
      background: rgba(92, 53, 247, 0.08);
      border-radius: 30px;
      margin-bottom: 14px;
    }

    .section-title {
      font-size: 34px;
      font-weight: 800;
      color: var(--text-main);
      line-height: 1.3;
      margin-bottom: 16px;
    }

    .section-desc {
      font-size: 16px;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* 首屏 Hero (严格无图，纯CSS与高质感排版) */
    .hero-section {
      padding: 90px 0 80px 0;
      background: linear-gradient(180deg, rgba(255, 255, 255, 0.9) 0%, rgba(243, 240, 255, 0.5) 100%);
      position: relative;
    }

    .hero-content {
      text-align: center;
      max-width: 960px;
      margin: 0 auto;
    }

    .hero-tagline {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 8px 20px;
      background: #ffffff;
      border: 1px solid rgba(92, 53, 247, 0.2);
      border-radius: 50px;
      font-size: 14px;
      font-weight: 600;
      color: var(--primary);
      box-shadow: var(--shadow-sm);
      margin-bottom: 24px;
    }

    .hero-title {
      font-size: 46px;
      font-weight: 900;
      line-height: 1.25;
      color: var(--text-main);
      letter-spacing: -0.5px;
      margin-bottom: 22px;
    }

    .hero-title span {
      background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-summary {
      font-size: 18px;
      color: var(--text-muted);
      max-width: 760px;
      margin: 0 auto 36px auto;
      line-height: 1.8;
    }

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

    .hero-actions .btn {
      padding: 15px 36px;
      font-size: 16px;
    }

    .hero-badges-strip {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 10px;
      max-width: 860px;
      margin: 0 auto;
    }

    .model-chip {
      background: #ffffff;
      border: 1px solid var(--border-color);
      padding: 6px 14px;
      font-size: 13px;
      font-weight: 600;
      color: var(--text-muted);
      border-radius: 20px;
      box-shadow: 0 2px 6px rgba(0, 0, 0, 0.02);
      transition: all var(--transition-fast);
    }

    .model-chip:hover {
      border-color: var(--primary);
      color: var(--primary);
      transform: translateY(-2px);
    }

    /* 指标网格 */
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      margin-top: -30px;
      position: relative;
      z-index: 10;
    }

    .metric-card {
      background: #ffffff;
      padding: 30px 24px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      text-align: center;
      transition: all var(--transition-fast);
    }

    .metric-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
      border-color: rgba(92, 53, 247, 0.3);
    }

    .metric-num {
      font-size: 38px;
      font-weight: 900;
      color: var(--primary);
      line-height: 1;
      margin-bottom: 8px;
    }

    .metric-label {
      font-size: 15px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 6px;
    }

    .metric-desc {
      font-size: 13px;
      color: var(--text-muted);
    }

    /* 卡片通用网格 */
    .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: 28px;
      align-items: center;
    }

    .feature-card {
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 30px;
      transition: all var(--transition-fast);
      position: relative;
      display: flex;
      flex-direction: column;
    }

    .feature-card:hover {
      transform: translateY(-5px);
      border-color: rgba(92, 53, 247, 0.35);
      box-shadow: var(--shadow-hover);
    }

    .feature-icon-box {
      width: 52px;
      height: 52px;
      border-radius: 14px;
      background: linear-gradient(135deg, rgba(92, 53, 247, 0.1) 0%, rgba(255, 51, 119, 0.1) 100%);
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary);
      font-weight: 800;
      font-size: 20px;
      margin-bottom: 20px;
    }

    .feature-title {
      font-size: 19px;
      font-weight: 700;
      margin-bottom: 12px;
      color: var(--text-main);
    }

    .feature-text {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 16px;
      flex-grow: 1;
    }

    .feature-tag {
      align-self: flex-start;
      font-size: 12px;
      font-weight: 600;
      padding: 4px 10px;
      border-radius: 6px;
      background: #f1f4fb;
      color: var(--primary);
    }

    /* 横幅展示与图文整合 */
    .media-card {
      background: #ffffff;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: all var(--transition-fast);
    }

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

    .media-card-img-wrap {
      width: 100%;
      background: #f0f2f7;
      overflow: hidden;
    }

    .media-card-img-wrap img {
      width: 100%;
      height: 220px;
      object-fit: cover;
      display: block;
      transition: transform 0.4s ease;
    }

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

    .media-card-body {
      padding: 24px;
    }

    /* 对比评测表格 */
    .compare-container {
      background: #ffffff;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      overflow-x: auto;
    }

    .compare-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 720px;
    }

    .compare-table th, .compare-table td {
      padding: 20px 24px;
      border-bottom: 1px solid var(--border-color);
      vertical-align: middle;
    }

    .compare-table th {
      background: #fafbfe;
      font-size: 15px;
      font-weight: 700;
      color: var(--text-main);
    }

    .compare-table td {
      font-size: 14px;
      color: var(--text-muted);
    }

    .col-highlight {
      background: rgba(92, 53, 247, 0.03);
      font-weight: 600;
      color: var(--text-main) !important;
    }

    .score-badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      background: #fff0f5;
      color: var(--secondary);
      padding: 6px 14px;
      border-radius: 20px;
      font-weight: 800;
      font-size: 15px;
    }

    /* 流程步骤 */
    .steps-wrapper {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      position: relative;
    }

    .step-item {
      background: #ffffff;
      padding: 28px 20px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      position: relative;
    }

    .step-badge {
      font-size: 32px;
      font-weight: 900;
      color: rgba(92, 53, 247, 0.2);
      line-height: 1;
      margin-bottom: 12px;
    }

    .step-title {
      font-size: 17px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 8px;
    }

    .step-text {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.6;
    }

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

    .pricing-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 34px 28px;
      text-align: center;
      transition: all var(--transition-fast);
      position: relative;
    }

    .pricing-card.featured {
      border: 2px solid var(--primary);
      box-shadow: var(--shadow-hover);
      transform: scale(1.02);
    }

    .pricing-badge {
      position: absolute;
      top: -12px;
      left: 50%;
      transform: translateX(-50%);
      background: linear-gradient(90deg, var(--secondary), var(--warm-accent));
      color: #ffffff;
      padding: 4px 16px;
      border-radius: 20px;
      font-size: 12px;
      font-weight: 700;
    }

    .price-num {
      font-size: 42px;
      font-weight: 900;
      color: var(--text-main);
      margin: 16px 0 8px 0;
    }

    .price-num span {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-muted);
    }

    .pricing-features {
      margin: 24px 0;
      text-align: left;
    }

    .pricing-features li {
      font-size: 14px;
      color: var(--text-muted);
      padding: 8px 0;
      border-bottom: 1px dashed rgba(229, 233, 242, 0.8);
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .pricing-features li::before {
      content: "✔";
      color: var(--accent);
      font-weight: bold;
    }

    /* 评价模块 */
    .testimonials-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .testimonial-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px;
      display: flex;
      flex-direction: column;
      box-shadow: var(--shadow-sm);
    }

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

    .testi-avatar {
      width: 46px;
      height: 46px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 18px;
    }

    .testi-name {
      font-size: 16px;
      font-weight: 700;
      color: var(--text-main);
    }

    .testi-role {
      font-size: 12px;
      color: var(--text-muted);
    }

    .testi-body {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
      flex-grow: 1;
      font-style: italic;
    }

    .testi-stars {
      color: var(--warm-accent);
      font-size: 14px;
      margin-top: 14px;
    }

    /* FAQ 手风琴 */
    .faq-list {
      max-width: 880px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }

    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      overflow: hidden;
      transition: all var(--transition-fast);
    }

    .faq-item.active {
      border-color: rgba(92, 53, 247, 0.4);
      box-shadow: var(--shadow-sm);
    }

    .faq-question {
      padding: 18px 24px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      cursor: pointer;
      font-weight: 700;
      font-size: 16px;
      color: var(--text-main);
      background: #ffffff;
      user-select: none;
    }

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

    .faq-icon {
      font-size: 18px;
      transition: transform var(--transition-fast);
    }

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

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease-out, padding 0.3s ease-out;
      background: #fafbfe;
      color: var(--text-muted);
      font-size: 14px;
      line-height: 1.7;
      padding: 0 24px;
    }

    .faq-item.active .faq-answer {
      padding: 16px 24px 22px 24px;
      max-height: 250px;
    }

    /* 需求匹配与联系我们表单 */
    .form-wrapper {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 40px;
      box-shadow: var(--shadow-sm);
    }

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

    .form-label {
      display: block;
      font-size: 14px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 8px;
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      font-size: 14px;
      color: var(--text-main);
      background: #fafbfe;
      outline: none;
      transition: border-color var(--transition-fast);
      font-family: inherit;
    }

    .form-control:focus {
      border-color: var(--primary);
      background: #ffffff;
    }

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

    /* 文章与资讯 */
    .articles-flex {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 24px;
      padding: 20px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
    }

    .article-pill {
      display: inline-block;
      padding: 8px 16px;
      background: #f1f4fb;
      border-radius: 30px;
      font-size: 13px;
      font-weight: 600;
      color: var(--primary);
      transition: all var(--transition-fast);
    }

    .article-pill:hover {
      background: var(--primary);
      color: #ffffff;
    }

    /* 浮动客服入口 */
    .floating-kefu {
      position: fixed;
      right: 24px;
      bottom: 30px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .kefu-trigger-btn {
      width: 52px;
      height: 52px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 8px 24px rgba(92, 53, 247, 0.4);
      cursor: pointer;
      font-size: 14px;
      font-weight: 700;
      transition: transform var(--transition-fast);
      position: relative;
    }

    .kefu-trigger-btn:hover {
      transform: scale(1.08);
    }

    .kefu-popup-card {
      position: absolute;
      right: 64px;
      bottom: 0;
      width: 260px;
      background: #ffffff;
      border-radius: var(--radius-md);
      box-shadow: 0 16px 40px rgba(0, 0, 0, 0.15);
      border: 1px solid var(--border-color);
      padding: 20px;
      display: none;
      text-align: center;
    }

    .kefu-trigger-btn:hover .kefu-popup-card {
      display: block;
    }

    .kefu-popup-card img {
      width: 140px;
      height: 140px;
      margin: 0 auto 10px auto;
      display: block;
      border-radius: 8px;
    }

    .kefu-popup-card p {
      font-size: 12px;
      color: var(--text-muted);
      line-height: 1.5;
    }

    /* 底部通用规范 */
    .site-footer {
      background: #ffffff;
      border-top: 1px solid var(--border-color);
      padding: 60px 0 30px 0;
      color: var(--text-muted);
    }

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

    .footer-col h4 {
      font-size: 16px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 18px;
    }

    .footer-links {
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .footer-links a {
      font-size: 14px;
      color: var(--text-muted);
    }

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

    .footer-friends-bar {
      border-top: 1px solid var(--border-color);
      padding: 24px 0;
      font-size: 13px;
      color: var(--text-muted);
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 16px;
    }

    .footer-friends-bar a {
      color: var(--text-muted);
    }

    .footer-friends-bar a:hover {
      color: var(--primary);
    }

    .footer-bottom {
      border-top: 1px solid var(--border-color);
      padding-top: 24px;
      text-align: center;
      font-size: 13px;
      color: #8c95a6;
    }

    /* 响应式媒体查询 */
    @media (max-width: 1024px) {
      .grid-4, .metrics-grid, .steps-wrapper {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3, .pricing-grid, .testimonials-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 768px) {
      .site-header {
        position: relative;
      }
      .mobile-menu-toggle {
        display: block;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 76px;
        left: 0;
        width: 100%;
        background: #ffffff;
        flex-direction: column;
        padding: 20px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-sm);
        gap: 8px;
      }
      .nav-links.active {
        display: flex;
      }
      .nav-cta-group {
        display: none;
      }
      .hero-title {
        font-size: 32px;
      }
      .hero-summary {
        font-size: 15px;
      }
      .grid-3, .grid-4, .grid-2, .metrics-grid, .steps-wrapper, .pricing-grid, .testimonials-grid {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .section-spacing {
        padding: 50px 0;
      }
      .floating-kefu {
        right: 16px;
        bottom: 16px;
      }
    }