:root {
      --bg-main: #f8fafc;
      --bg-card: #ffffff;
      --bg-card-glass: rgba(255, 255, 255, 0.85);
      --text-main: #0f172a;
      --text-sub: #475569;
      --text-muted: #64748b;
      --primary: #6366f1;
      --primary-dark: #4f46e5;
      --accent-holo: linear-gradient(135deg, #ec4899 0%, #8b5cf6 50%, #06b6d4 100%);
      --border-color: #e2e8f0;
      --border-holo: linear-gradient(135deg, rgba(236, 72, 153, 0.3), rgba(6, 182, 212, 0.3));
      --shadow-sm: 0 2px 8px rgba(15, 23, 42, 0.04);
      --shadow-md: 0 10px 25px -5px rgba(99, 102, 241, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.03);
      --shadow-holo: 0 12px 30px rgba(139, 92, 246, 0.18);
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --container-width: 1200px;
    }

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

    html {
      scroll-behavior: smooth;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
      background-color: var(--bg-main);
      color: var(--text-main);
      line-height: 1.6;
    }

    body {
      background: radial-gradient(circle at 10% 20%, rgba(236, 72, 153, 0.05) 0%, rgba(139, 92, 246, 0.05) 40%, rgba(6, 182, 212, 0.05) 90%), var(--bg-main);
      min-height: 100vh;
    }

    a {
      color: var(--primary);
      text-decoration: none;
      transition: all 0.2s ease;
    }

    a:hover {
      color: var(--primary-dark);
    }

    /* 容器控制 */
    .container {
      width: 100%;
      max-width: var(--container-width);
      margin: 0 auto;
      padding: 0 20px;
    }

    /* 头部导航 */
    .header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.9);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
      padding: 12px 0;
    }

    .nav-wrapper {
      display: flex;
      align-items: center;
      justify-content: space-between;
    }

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

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

    .brand-name {
      font-size: 1.25rem;
      font-weight: 800;
      background: var(--accent-holo);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 0; /* 严格符合规则要求 */
      list-style: none;
    }

    .nav-links li a {
      display: block;
      padding: 8px 12px;
      font-size: 0.9rem;
      color: var(--text-sub);
      font-weight: 500;
      border-radius: var(--radius-sm);
    }

    .nav-links li a:hover {
      color: var(--primary);
      background: rgba(99, 102, 241, 0.06);
    }

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      font-size: 0.92rem;
      font-weight: 600;
      border-radius: 99px;
      cursor: pointer;
      border: none;
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }

    .btn-holo {
      background: var(--accent-holo);
      color: #ffffff !important;
      box-shadow: 0 4px 15px rgba(139, 92, 246, 0.3);
    }

    .btn-holo:hover {
      transform: translateY(-2px);
      box-shadow: 0 8px 25px rgba(236, 72, 153, 0.4);
      opacity: 0.95;
    }

    .btn-outline {
      border: 1px solid var(--primary);
      color: var(--primary);
      background: transparent;
    }

    .btn-outline:hover {
      background: var(--primary);
      color: #ffffff !important;
    }

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

    /* 首屏 HERO 区域 - 严格禁止图片 */
    .hero-section {
      padding: 90px 0 70px;
      text-align: center;
      position: relative;
      overflow: hidden;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 18px;
      border-radius: 99px;
      background: rgba(236, 72, 153, 0.08);
      border: 1px solid rgba(236, 72, 153, 0.2);
      color: #db2777;
      font-size: 0.85rem;
      font-weight: 600;
      margin-bottom: 24px;
    }

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

    .hero-title span {
      background: var(--accent-holo);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-desc {
      max-width: 780px;
      margin: 0 auto 36px;
      font-size: 1.125rem;
      color: var(--text-sub);
      line-height: 1.7;
    }

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

    .hero-actions .btn {
      padding: 14px 32px;
      font-size: 1rem;
    }

    .hero-stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      max-width: 1000px;
      margin: 0 auto;
    }

    .stat-card {
      background: var(--bg-card-glass);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px 16px;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
      position: relative;
    }

    .stat-card::before {
      content: '';
      position: absolute;
      top: 0; left: 0; right: 0; height: 3px;
      background: var(--accent-holo);
      border-radius: var(--radius-md) var(--radius-md) 0 0;
      opacity: 0.8;
    }

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

    .stat-num {
      font-size: 2.2rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 4px;
    }

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

    /* 通用 Section 样式 */
    .section-padding {
      padding: 70px 0;
    }

    .section-header {
      text-align: center;
      max-width: 700px;
      margin: 0 auto 50px;
    }

    .section-tag {
      font-size: 0.82rem;
      font-weight: 700;
      letter-spacing: 1px;
      text-transform: uppercase;
      color: var(--primary);
      margin-bottom: 8px;
      display: block;
    }

    .section-title {
      font-size: 2rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 14px;
    }

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

    /* 卡片网格 */
    .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: 30px;
    }

    .feature-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
    }

    .feature-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-md);
      border-color: rgba(139, 92, 246, 0.3);
    }

    .feature-icon {
      width: 48px;
      height: 48px;
      border-radius: 12px;
      background: rgba(99, 102, 241, 0.1);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.5rem;
      margin-bottom: 18px;
      color: var(--primary);
    }

    .feature-title {
      font-size: 1.15rem;
      font-weight: 700;
      margin-bottom: 10px;
      color: var(--text-main);
    }

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

    /* 支撑模型标签云 */
    .model-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-top: 30px;
    }

    .model-tag {
      background: #ffffff;
      border: 1px solid var(--border-color);
      padding: 8px 16px;
      border-radius: 99px;
      font-size: 0.88rem;
      font-weight: 600;
      color: var(--text-sub);
      box-shadow: var(--shadow-sm);
      transition: all 0.2s ease;
    }

    .model-tag:hover {
      border-color: var(--primary);
      color: var(--primary);
      transform: scale(1.05);
    }

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

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

    .step-num {
      font-size: 2.5rem;
      font-weight: 900;
      background: var(--accent-holo);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      line-height: 1;
      margin-bottom: 12px;
    }

    /* 案例图片展示区 (非首屏) */
    .case-card {
      background: var(--bg-card);
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

    .case-img-wrap {
      width: 100%;
      height: 200px;
      overflow: hidden;
      background: #f1f5f9;
    }

    .ai-page-image {
      width: 100%;
      height: 100%;
      object-fit: cover;
      display: block;
      transition: transform 0.4s ease;
    }

    .case-card:hover .ai-page-image {
      transform: scale(1.05);
    }

    .case-info {
      padding: 20px;
    }

    .case-title {
      font-size: 1.05rem;
      font-weight: 700;
      margin-bottom: 8px;
    }

    .case-desc {
      font-size: 0.88rem;
      color: var(--text-sub);
    }

    /* 对比评测表格 */
    .comparison-table-wrap {
      background: var(--bg-card);
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      overflow-x: auto;
      box-shadow: var(--shadow-md);
    }

    .comparison-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 650px;
    }

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

    .comparison-table th {
      background: rgba(248, 250, 252, 0.8);
      font-weight: 700;
      color: var(--text-main);
    }

    .comparison-table tr:last-child td {
      border-bottom: none;
    }

    .badge-highlight {
      background: rgba(139, 92, 246, 0.1);
      color: var(--primary-dark);
      font-weight: 700;
      padding: 4px 10px;
      border-radius: 99px;
      font-size: 0.82rem;
    }

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

    .price-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 32px 24px;
      text-align: center;
      position: relative;
      box-shadow: var(--shadow-sm);
    }

    .price-card.featured {
      border: 2px solid var(--primary);
      box-shadow: var(--shadow-holo);
    }

    .price-card.featured::after {
      content: '超值首选';
      position: absolute;
      top: -14px;
      left: 50%;
      transform: translateX(-50%);
      background: var(--accent-holo);
      color: #fff;
      font-size: 0.78rem;
      font-weight: 700;
      padding: 3px 14px;
      border-radius: 99px;
    }

    .price-val {
      font-size: 2.4rem;
      font-weight: 900;
      color: var(--text-main);
      margin: 16px 0;
    }

    .price-unit {
      font-size: 0.9rem;
      color: var(--text-muted);
      font-weight: 400;
    }

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

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

    .user-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: var(--accent-holo);
      display: flex;
      align-items: center;
      justify-content: center;
      color: #ffffff;
      font-weight: 700;
      font-size: 1.1rem;
    }

    .user-info h4 {
      font-size: 0.98rem;
      font-weight: 700;
    }

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

    .review-stars {
      color: #f59e0b;
      margin-bottom: 10px;
      font-size: 0.9rem;
    }

    /* FAQ 手风琴 */
    .faq-list {
      max-width: 900px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

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

    .faq-question {
      padding: 18px 24px;
      font-size: 1.05rem;
      font-weight: 700;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      user-select: none;
    }

    .faq-answer {
      padding: 0 24px 18px;
      font-size: 0.95rem;
      color: var(--text-sub);
      display: none;
      line-height: 1.7;
    }

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

    .faq-toggle-icon {
      font-size: 1.2rem;
      transition: transform 0.3s ease;
    }

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

    /* 表单区 */
    .form-container {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 36px;
      box-shadow: var(--shadow-md);
      max-width: 700px;
      margin: 0 auto;
    }

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

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

    .form-input, .form-select, .form-textarea {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      font-size: 0.95rem;
      background: #f8fafc;
      transition: border-color 0.2s ease;
    }

    .form-input:focus, .form-select:focus, .form-textarea:focus {
      outline: none;
      border-color: var(--primary);
      background: #ffffff;
    }

    /* 文章与百科 */
    .article-links-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 16px;
    }

    .article-item {
      background: var(--bg-card);
      padding: 16px;
      border-radius: var(--radius-sm);
      border: 1px solid var(--border-color);
      display: flex;
      align-items: center;
      justify-content: space-between;
    }

    /* 页脚与联系方式 */
    .footer {
      background: #0f172a;
      color: #94a3b8;
      padding: 60px 0 30px;
      font-size: 0.9rem;
    }

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

    .footer-col h3 {
      color: #ffffff;
      font-size: 1.1rem;
      margin-bottom: 20px;
    }

    .footer-col p, .footer-col li {
      margin-bottom: 10px;
      color: #94a3b8;
    }

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

    .footer-col a {
      color: #94a3b8;
    }

    .footer-col a:hover {
      color: #ffffff;
    }

    .friend-links {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 10px;
    }

    .friend-links a {
      color: #cbd5e1;
      background: rgba(255, 255, 255, 0.05);
      padding: 4px 10px;
      border-radius: 4px;
      font-size: 0.82rem;
    }

    .friend-links a:hover {
      background: rgba(255, 255, 255, 0.15);
      color: #ffffff;
    }

    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.1);
      padding-top: 24px;
      text-align: center;
      font-size: 0.85rem;
    }

    /* 悬浮客服面板 */
    .floating-kefu {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      background: var(--bg-card);
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-holo);
      padding: 12px;
      text-align: center;
      border: 1px solid var(--border-color);
      width: 140px;
    }

    .floating-kefu img {
      width: 110px;
      height: 110px;
      border-radius: 8px;
      display: block;
      margin: 0 auto 6px;
    }

    .floating-kefu span {
      font-size: 0.78rem;
      font-weight: 700;
      color: var(--text-main);
      display: block;
    }

    /* 响应式适配 */
    @media (max-width: 992px) {
      .hero-stats-grid, .grid-4, .process-steps {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3, .pricing-grid {
        grid-template-columns: repeat(1, 1fr);
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 768px) {
      .hero-title {
        font-size: 2rem;
      }
      .menu-toggle {
        display: block;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: #ffffff;
        flex-direction: column;
        padding: 16px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-md);
      }
      .nav-links.active {
        display: flex;
      }
      .nav-links li {
        width: 100%;
        text-align: center;
      }
      .hero-stats-grid, .grid-2, .article-links-grid {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .floating-kefu {
        display: none; /* 移动端隐藏悬浮框，保障界面整洁 */
      }
    }