:root {
      --primary-yellow: #FFD000;
      --primary-dark: #1F2421;
      --accent-yellow: #FFF176;
      --hover-yellow: #E6BC00;
      --bg-light: #FFFDF5;
      --bg-card: #FFFFFF;
      --text-main: #212529;
      --text-muted: #5A626A;
      --border-color: #EFE6CD;
      --shadow-sm: 0 4px 12px rgba(255, 208, 0, 0.08);
      --shadow-md: 0 8px 24px rgba(31, 36, 33, 0.06);
      --shadow-lg: 0 16px 36px rgba(255, 208, 0, 0.15);
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --transition: all 0.28s 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, sans-serif;
      background-color: var(--bg-light);
      color: var(--text-main);
      line-height: 1.65;
      overflow-x: hidden;
    }

    a {
      text-decoration: none;
      color: inherit;
    }

    .container {
      width: 100%;
      max-width: 1200px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 20px;
      padding-right: 20px;
    }

    /* 顶部导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background-color: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(10px);
      border-bottom: 2px solid var(--primary-yellow);
    }

    .nav-wrapper {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }

    .brand-logo-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;
      list-style: none;
    }

    .nav-links li a {
      font-weight: 600;
      color: var(--text-main);
      padding: 10px 14px;
      display: inline-block;
      transition: var(--transition);
      font-size: 0.95rem;
    }

    .nav-links li a:hover {
      color: #000;
      background-color: var(--accent-yellow);
      border-radius: var(--radius-sm);
    }

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

    .btn-main {
      background-color: var(--primary-yellow);
      color: #000000;
      font-weight: 700;
      padding: 10px 22px;
      border-radius: var(--radius-sm);
      border: 2px solid #000000;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: var(--transition);
      cursor: pointer;
      box-shadow: 2px 2px 0px #000000;
    }

    .btn-main:hover {
      background-color: #000000;
      color: var(--primary-yellow);
      transform: translate(-1px, -1px);
      box-shadow: 4px 4px 0px var(--primary-yellow);
    }

    .btn-secondary {
      background-color: #FFFFFF;
      color: var(--text-main);
      font-weight: 600;
      padding: 10px 20px;
      border-radius: var(--radius-sm);
      border: 1px solid var(--border-color);
      transition: var(--transition);
    }

    .btn-secondary:hover {
      background-color: var(--accent-yellow);
      border-color: #000000;
    }

    .mobile-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.5rem;
      cursor: pointer;
    }

    /* 首屏 Hero */
    .hero-section {
      background: linear-gradient(180deg, #FFF9D2 0%, var(--bg-light) 100%);
      padding: 80px 0 60px;
      position: relative;
    }

    .hero-content {
      text-align: center;
      max-width: 900px;
      margin: 0 auto;
    }

    .hero-badge {
      display: inline-block;
      background-color: var(--primary-dark);
      color: var(--primary-yellow);
      font-weight: 700;
      padding: 6px 16px;
      border-radius: 30px;
      font-size: 0.88rem;
      margin-bottom: 20px;
    }

    .hero-title {
      font-size: 2.5rem;
      font-weight: 800;
      color: #111111;
      line-height: 1.25;
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }

    .hero-desc {
      font-size: 1.15rem;
      color: var(--text-muted);
      margin-bottom: 36px;
      max-width: 760px;
      margin-left: auto;
      margin-right: auto;
    }

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

    .hero-btn-large {
      font-size: 1.15rem;
      padding: 14px 36px;
    }

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

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

    .stat-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: var(--primary-yellow);
    }

    .stat-value {
      font-size: 2rem;
      font-weight: 800;
      color: #111111;
      margin-bottom: 6px;
    }

    .stat-label {
      font-size: 0.9rem;
      color: var(--text-muted);
    }

    /* 区域通用样式 */
    .section-padding {
      padding: 70px 0;
    }

    .section-header {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 48px;
    }

    .section-tag {
      color: #9E7D00;
      font-weight: 700;
      font-size: 0.88rem;
      text-transform: uppercase;
      letter-spacing: 1px;
      margin-bottom: 8px;
      display: inline-block;
    }

    .section-title {
      font-size: 2.1rem;
      font-weight: 800;
      color: #111;
      margin-bottom: 14px;
    }

    .section-subtitle {
      font-size: 1.05rem;
      color: var(--text-muted);
    }

    /* 模块样式 */
    .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: 32px;
      align-items: center;
    }

    .card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px;
      transition: var(--transition);
    }

    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: var(--primary-yellow);
    }

    .card-title {
      font-size: 1.25rem;
      font-weight: 700;
      color: #111;
      margin-bottom: 12px;
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .card-text {
      color: var(--text-muted);
      font-size: 0.95rem;
      line-height: 1.6;
    }

    /* 标签云与模型聚合 */
    .model-tags-wrap {
      background: #FFFFFF;
      border: 2px solid var(--primary-yellow);
      border-radius: var(--radius-lg);
      padding: 36px;
      box-shadow: var(--shadow-sm);
    }

    .tag-cloud {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 20px;
    }

    .tag-item {
      background: var(--bg-light);
      border: 1px solid var(--border-color);
      padding: 8px 18px;
      border-radius: 20px;
      font-weight: 600;
      font-size: 0.9rem;
      color: #333;
      transition: var(--transition);
    }

    .tag-item:hover {
      background: var(--primary-yellow);
      color: #000;
      border-color: #000;
      transform: scale(1.05);
    }

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

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

    .step-number {
      width: 36px;
      height: 36px;
      background: var(--primary-yellow);
      color: #000;
      font-weight: 800;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 14px;
      border: 1px solid #000;
    }

    /* 对比评测表格 */
    .comparison-section {
      background: #FFFDF0;
    }

    .rating-banner {
      background: #1F2421;
      color: #FFF;
      border-radius: var(--radius-md);
      padding: 24px 32px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      margin-bottom: 30px;
      border-left: 6px solid var(--primary-yellow);
    }

    .rating-score {
      font-size: 2.2rem;
      font-weight: 800;
      color: var(--primary-yellow);
    }

    .table-container {
      overflow-x: auto;
      background: #FFFFFF;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
    }

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

    .custom-table th, .custom-table td {
      padding: 18px 24px;
      border-bottom: 1px solid #F0EADB;
      font-size: 0.95rem;
    }

    .custom-table th {
      background: #FFF9D2;
      font-weight: 700;
      color: #111;
    }

    .highlight-cell {
      background: #FFFDF5;
      font-weight: 700;
      color: #111;
    }

    /* 图片与图文展示 */
    .img-wrapper {
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

    .img-wrapper img {
      width: 100%;
      height: auto;
      display: block;
      transition: var(--transition);
    }

    .img-wrapper:hover img {
      transform: scale(1.02);
    }

    /* 客户评价 */
    .review-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .review-user {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-top: 18px;
    }

    .user-avatar {
      width: 44px;
      height: 44px;
      background: var(--accent-yellow);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      color: #111;
    }

    /* 表单区域 */
    .form-wrapper {
      background: #FFFFFF;
      border: 2px solid var(--primary-yellow);
      border-radius: var(--radius-lg);
      padding: 40px;
      box-shadow: var(--shadow-md);
    }

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

    .form-group label {
      display: block;
      font-weight: 600;
      margin-bottom: 8px;
      font-size: 0.92rem;
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      font-size: 0.95rem;
      transition: var(--transition);
      font-family: inherit;
    }

    .form-control:focus {
      outline: none;
      border-color: #000;
      box-shadow: 0 0 0 3px rgba(255, 208, 0, 0.4);
    }

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

    /* FAQ 手风琴 */
    .faq-accordion {
      display: flex;
      flex-direction: column;
      gap: 14px;
    }

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

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

    .faq-question:hover {
      background: #FFFDF0;
    }

    .faq-answer {
      padding: 0 24px;
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      color: var(--text-muted);
      font-size: 0.95rem;
      border-top: 1px solid transparent;
    }

    .faq-item.active .faq-answer {
      padding: 18px 24px;
      max-height: 200px;
      border-top-color: #F0EADB;
    }

    .faq-item.active .faq-question {
      background: #FFF9D2;
    }

    /* 资讯与外链 */
    .article-list, .friend-links {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
    }

    .article-item, .friend-link-item {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      padding: 10px 18px;
      border-radius: var(--radius-sm);
      font-size: 0.92rem;
      transition: var(--transition);
      display: inline-block;
    }

    .article-item:hover, .friend-link-item:hover {
      background: var(--primary-yellow);
      border-color: #000;
      color: #000;
    }

    /* 页脚 */
    .site-footer {
      background: #1F2421;
      color: #E0E0E0;
      padding: 60px 0 30px;
      border-top: 4px solid var(--primary-yellow);
    }

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

    .footer-col h4 {
      color: var(--primary-yellow);
      font-size: 1.1rem;
      margin-bottom: 18px;
      font-weight: 700;
    }

    .footer-col p, .footer-col li {
      font-size: 0.9rem;
      line-height: 1.8;
      color: #BDBDBD;
    }

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

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

    .qr-container {
      background: #FFFFFF;
      padding: 8px;
      border-radius: var(--radius-sm);
      display: inline-block;
      width: 110px;
      height: 110px;
    }

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

    .footer-bottom {
      border-top: 1px solid #333935;
      padding-top: 24px;
      text-align: center;
      font-size: 0.85rem;
      color: #8E9690;
    }

    /* 浮动工具栏 */
    .floating-tools {
      position: fixed;
      right: 20px;
      bottom: 30px;
      display: flex;
      flex-direction: column;
      gap: 10px;
      z-index: 999;
    }

    .float-btn {
      width: 48px;
      height: 48px;
      background: var(--primary-yellow);
      color: #000;
      border: 2px solid #000;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      cursor: pointer;
      box-shadow: 2px 2px 0px #000;
      transition: var(--transition);
    }

    .float-btn:hover {
      transform: scale(1.08);
      background: #000;
      color: var(--primary-yellow);
    }

    /* 响应式调整 */
    @media (max-width: 992px) {
      .hero-title {
        font-size: 2rem;
      }
      .grid-4, .hero-stats-grid, .process-timeline {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #FFFFFF;
        flex-direction: column;
        padding: 20px;
        border-bottom: 2px solid var(--primary-yellow);
        box-shadow: var(--shadow-md);
      }
      .nav-links.active {
        display: flex;
      }
      .nav-links li a {
        width: 100%;
        padding: 12px;
      }
      .mobile-toggle {
        display: block;
      }
    }

    @media (max-width: 768px) {
      .grid-3, .grid-4, .hero-stats-grid, .grid-2, .process-timeline, .footer-grid {
        grid-template-columns: 1fr;
      }
      .hero-title {
        font-size: 1.7rem;
      }
      .rating-banner {
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
      }
      .form-wrapper {
        padding: 24px;
      }
    }