:root {
      --primary-yellow: #FFCC00;
      --accent-yellow: #FFB800;
      --light-yellow-bg: #FFFDF0;
      --badge-yellow: #FFE885;
      --text-main: #1F2937;
      --text-muted: #4B5563;
      --text-light: #6B7280;
      --bg-page: #F9FAFB;
      --bg-card: #FFFFFF;
      --border-color: #E5E7EB;
      --border-yellow: #FDE047;
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
      --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
      --shadow-hover: 0 12px 24px rgba(255,184,0,0.18);
      --radius: 10px;
      --container-width: 1200px;
    }

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

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-page);
      color: var(--text-main);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }

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

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

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

    /* 顶部导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background-color: #FFFFFF;
      border-bottom: 2px solid var(--primary-yellow);
      box-shadow: var(--shadow-sm);
    }

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

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

    .logo-container {
      max-height: 48px;
      display: flex;
      align-items: center;
    }

    .brand-name {
      font-size: 20px;
      font-weight: 700;
      color: #111827;
      letter-spacing: -0.5px;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
      list-style: none;
    }

    .nav-links li a {
      font-size: 14px;
      font-weight: 600;
      color: var(--text-main);
      padding: 8px 14px;
      border-radius: 6px;
      transition: all 0.2s ease;
    }

    .nav-links li a:hover {
      background-color: var(--light-yellow-bg);
      color: #D97706;
    }

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-size: 14px;
      font-weight: 700;
      padding: 10px 22px;
      border-radius: 8px;
      cursor: pointer;
      transition: all 0.25s ease;
      border: none;
      text-align: center;
    }

    .btn-yellow {
      background-color: var(--primary-yellow);
      color: #111827;
      box-shadow: 0 4px 10px rgba(255, 204, 0, 0.35);
    }

    .btn-yellow:hover {
      background-color: var(--accent-yellow);
      transform: translateY(-2px);
      box-shadow: 0 6px 14px rgba(255, 184, 0, 0.45);
    }

    .btn-outline {
      border: 1.5px solid #111827;
      background: transparent;
      color: #111827;
    }

    .btn-outline:hover {
      background-color: #111827;
      color: #FFFFFF;
    }

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

    /* 鲜黄首屏 Hero（无图片） */
    .hero-section {
      background: linear-gradient(135deg, #FFF9D2 0%, #FFFDF0 60%, #FFFFFF 100%);
      border-bottom: 1px solid var(--border-yellow);
      padding: 70px 0 60px 0;
      position: relative;
      overflow: hidden;
    }

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

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background-color: var(--primary-yellow);
      color: #111827;
      padding: 6px 16px;
      border-radius: 30px;
      font-size: 13px;
      font-weight: 700;
      margin-bottom: 24px;
      box-shadow: var(--shadow-sm);
    }

    .hero-title {
      font-size: 38px;
      font-weight: 800;
      line-height: 1.25;
      color: #111827;
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }

    .hero-desc {
      font-size: 17px;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 32px;
      max-width: 820px;
      margin-left: auto;
      margin-right: auto;
    }

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

    .hero-stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 18px;
      margin-top: 20px;
    }

    .stat-card {
      background: #FFFFFF;
      padding: 20px 16px;
      border-radius: var(--radius);
      border: 1px solid var(--border-yellow);
      box-shadow: var(--shadow-sm);
      transition: transform 0.2s ease;
    }

    .stat-card:hover {
      transform: translateY(-3px);
      box-shadow: var(--shadow-md);
    }

    .stat-num {
      font-size: 26px;
      font-weight: 800;
      color: #D97706;
      margin-bottom: 4px;
    }

    .stat-label {
      font-size: 13px;
      color: var(--text-muted);
      font-weight: 600;
    }

    /* Section 通用规范 */
    .section-wrap {
      padding: 70px 0;
      border-bottom: 1px solid var(--border-color);
    }

    .section-header {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 46px auto;
    }

    .section-tag {
      display: inline-block;
      font-size: 12px;
      font-weight: 700;
      color: #B45309;
      background-color: var(--badge-yellow);
      padding: 4px 12px;
      border-radius: 4px;
      margin-bottom: 12px;
      text-transform: uppercase;
    }

    .section-title {
      font-size: 28px;
      font-weight: 800;
      color: #111827;
      margin-bottom: 12px;
    }

    .section-subtitle {
      font-size: 15px;
      color: var(--text-muted);
    }

    /* 模型支持跑马灯/网格 */
    .model-tags-wrap {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 10px;
      margin-top: 20px;
    }

    .model-pill {
      background-color: #FFFFFF;
      border: 1px solid var(--border-color);
      padding: 8px 18px;
      border-radius: 30px;
      font-size: 13px;
      font-weight: 600;
      color: var(--text-main);
      box-shadow: var(--shadow-sm);
      transition: all 0.2s ease;
    }

    .model-pill:hover {
      border-color: var(--accent-yellow);
      background-color: var(--light-yellow-bg);
      color: #D97706;
    }

    /* 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: 28px;
    }

    .feature-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 24px;
      transition: all 0.25s ease;
      display: flex;
      flex-direction: column;
      height: 100%;
    }

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

    .card-icon-badge {
      width: 44px;
      height: 44px;
      border-radius: 8px;
      background-color: var(--badge-yellow);
      color: #78350F;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 20px;
      font-weight: bold;
      margin-bottom: 16px;
    }

    .card-title {
      font-size: 18px;
      font-weight: 700;
      color: #111827;
      margin-bottom: 10px;
    }

    .card-desc {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
      flex-grow: 1;
    }

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

    .step-item {
      background: #FFFFFF;
      padding: 24px 20px;
      border-radius: var(--radius);
      border-top: 4px solid var(--primary-yellow);
      box-shadow: var(--shadow-sm);
      text-align: center;
    }

    .step-idx {
      width: 36px;
      height: 36px;
      background: var(--primary-yellow);
      color: #111827;
      border-radius: 50%;
      font-size: 16px;
      font-weight: 800;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 14px;
    }

    /* 对比评测表格与评分卡 */
    .review-score-box {
      background: linear-gradient(135deg, #FFFBEB 0%, #FEF3C7 100%);
      border: 1px solid var(--border-yellow);
      border-radius: var(--radius);
      padding: 28px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: 30px;
      flex-wrap: wrap;
      gap: 20px;
    }

    .score-left h3 {
      font-size: 20px;
      color: #111827;
      margin-bottom: 6px;
    }

    .score-left p {
      font-size: 14px;
      color: var(--text-muted);
    }

    .score-right {
      display: flex;
      align-items: baseline;
      gap: 8px;
    }

    .score-val {
      font-size: 42px;
      font-weight: 900;
      color: #D97706;
      line-height: 1;
    }

    .score-total {
      font-size: 18px;
      color: var(--text-light);
    }

    .score-stars {
      color: #F59E0B;
      font-size: 20px;
      margin-left: 12px;
    }

    .comparison-table-wrapper {
      overflow-x: auto;
      background: #FFFFFF;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

    .comparison-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      font-size: 14px;
    }

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

    .comparison-table th {
      background-color: #F9FAFB;
      color: #111827;
      font-weight: 700;
    }

    .comparison-table tr.highlight-row {
      background-color: #FFFDF0;
    }

    .comparison-table tr.highlight-row td {
      font-weight: 600;
      color: #111827;
    }

    .tag-strong {
      background-color: var(--primary-yellow);
      color: #111827;
      padding: 3px 8px;
      border-radius: 4px;
      font-size: 12px;
      font-weight: 700;
    }

    /* 案例展示 */
    .case-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
    }

    .case-img-wrap {
      width: 100%;
      background: #F3F4F6;
    }

    .case-body {
      padding: 20px;
      flex-grow: 1;
    }

    .case-title {
      font-size: 16px;
      font-weight: 700;
      margin-bottom: 8px;
      color: #111827;
    }

    .case-desc {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.5;
    }

    /* 评论卡片 */
    .testimonial-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 22px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

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

    .user-avatar-circle {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background-color: var(--badge-yellow);
      color: #78350F;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 16px;
    }

    .user-meta-name {
      font-size: 15px;
      font-weight: 700;
      color: #111827;
    }

    .user-meta-role {
      font-size: 12px;
      color: var(--text-light);
    }

    .testimonial-content {
      font-size: 13.5px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* FAQ 折叠面板 */
    .faq-list {
      max-width: 860px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }

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

    .faq-question {
      padding: 18px 20px;
      font-size: 15px;
      font-weight: 700;
      color: #111827;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      background: #FFFFFF;
      transition: background 0.2s ease;
    }

    .faq-question:hover {
      background-color: var(--light-yellow-bg);
    }

    .faq-arrow {
      font-size: 12px;
      color: #D97706;
      transition: transform 0.2s ease;
    }

    .faq-item.active .faq-arrow {
      transform: rotate(180deg);
    }

    .faq-answer {
      display: none;
      padding: 0 20px 18px 20px;
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
      border-top: 1px dashed var(--border-color);
      padding-top: 14px;
    }

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

    /* 表单与联系区 */
    .contact-form-layout {
      display: grid;
      grid-template-columns: 1.1fr 0.9fr;
      gap: 36px;
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 36px;
      box-shadow: var(--shadow-sm);
    }

    .form-group {
      margin-bottom: 18px;
    }

    .form-group label {
      display: block;
      font-size: 14px;
      font-weight: 600;
      color: #111827;
      margin-bottom: 6px;
    }

    .form-control {
      width: 100%;
      padding: 11px 14px;
      border: 1px solid var(--border-color);
      border-radius: 6px;
      font-size: 14px;
      color: var(--text-main);
      background-color: #F9FAFB;
      transition: border 0.2s ease, background 0.2s ease;
    }

    .form-control:focus {
      outline: none;
      border-color: var(--accent-yellow);
      background-color: #FFFFFF;
    }

    textarea.form-control {
      resize: vertical;
      min-height: 100px;
    }

    .contact-info-panel {
      background: var(--light-yellow-bg);
      border: 1px solid var(--border-yellow);
      border-radius: var(--radius);
      padding: 28px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .contact-detail-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 14px;
      margin-top: 18px;
      font-size: 14px;
      color: var(--text-main);
    }

    .contact-detail-list strong {
      color: #111827;
    }

    .qr-box {
      margin-top: 20px;
      text-align: center;
      background: #FFFFFF;
      padding: 16px;
      border-radius: 8px;
      border: 1px solid var(--border-color);
      max-width: 200px;
    }

    .qr-box p {
      font-size: 12px;
      font-weight: 600;
      color: var(--text-muted);
      margin-top: 8px;
    }

    /* 资讯与百科文章 */
    .article-links-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 18px;
    }

    .article-item-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 20px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      transition: border 0.2s ease;
    }

    .article-item-card:hover {
      border-color: var(--accent-yellow);
    }

    .article-item-card a {
      font-size: 15px;
      font-weight: 700;
      color: #111827;
      line-height: 1.4;
      display: block;
      margin-bottom: 8px;
    }

    .article-item-card a:hover {
      color: #D97706;
    }

    .article-tag {
      font-size: 12px;
      color: var(--text-light);
    }

    /* 页脚与友情链接 */
    .site-footer {
      background-color: #111827;
      color: #9CA3AF;
      padding: 50px 0 30px 0;
      border-top: 3px solid var(--primary-yellow);
    }

    .footer-top {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1fr;
      gap: 30px;
      margin-bottom: 40px;
    }

    .footer-col h4 {
      font-size: 15px;
      font-weight: 700;
      color: #FFFFFF;
      margin-bottom: 16px;
      border-left: 3px solid var(--primary-yellow);
      padding-left: 8px;
    }

    .footer-col p {
      font-size: 13px;
      line-height: 1.7;
    }

    .footer-links-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 8px;
      font-size: 13px;
    }

    .footer-links-list a {
      color: #9CA3AF;
      transition: color 0.2s ease;
    }

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

    .friend-links-box {
      border-top: 1px solid #1F2937;
      padding-top: 24px;
      margin-bottom: 24px;
    }

    .friend-links-title {
      font-size: 13px;
      font-weight: 700;
      color: #E5E7EB;
      margin-bottom: 10px;
    }

    .friend-links-container {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      font-size: 13px;
    }

    .friend-links-container a {
      color: #9CA3AF;
      transition: color 0.2s ease;
    }

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

    .footer-bottom {
      border-top: 1px solid #1F2937;
      padding-top: 20px;
      text-align: center;
      font-size: 13px;
      color: #6B7280;
    }

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

    .float-btn {
      width: 46px;
      height: 46px;
      background-color: var(--primary-yellow);
      color: #111827;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: var(--shadow-md);
      cursor: pointer;
      font-weight: 700;
      font-size: 13px;
      border: none;
      transition: all 0.2s ease;
    }

    .float-btn:hover {
      background-color: var(--accent-yellow);
      transform: scale(1.06);
    }

    /* 响应式调整 */
    @media (max-width: 992px) {
      .grid-4, .hero-stats-grid, .steps-container {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3, .article-links-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-top {
        grid-template-columns: 1fr 1fr;
      }
      .contact-form-layout {
        grid-template-columns: 1fr;
      }
    }

    @media (max-width: 768px) {
      .hero-title {
        font-size: 26px;
      }
      .grid-3, .grid-2, .grid-4, .hero-stats-grid, .steps-container, .article-links-grid {
        grid-template-columns: 1fr;
      }
      .mobile-menu-toggle {
        display: block;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #FFFFFF;
        flex-direction: column;
        padding: 16px;
        border-bottom: 2px solid var(--primary-yellow);
        box-shadow: var(--shadow-md);
      }
      .nav-links.active {
        display: flex;
      }
      .nav-links li {
        width: 100%;
        text-align: center;
      }
      .nav-links li a {
        display: block;
        padding: 10px 0;
      }
      .footer-top {
        grid-template-columns: 1fr;
      }
    }