:root {
      --primary: #4f46e5;
      --primary-hover: #4338ca;
      --rainbow-1: #ef4444;
      --rainbow-2: #f97316;
      --rainbow-3: #eab308;
      --rainbow-4: #10b981;
      --rainbow-5: #06b6d4;
      --rainbow-6: #6366f1;
      --rainbow-7: #a855f7;
      --bg-page: #f8fafc;
      --bg-surface: #ffffff;
      --text-main: #0f172a;
      --text-muted: #475569;
      --border-color: #e2e8f0;
      --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
      --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
      --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.03);
      --radius: 12px;
    }

    * {
      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;
      color: var(--text-main);
      background-color: var(--bg-page);
      line-height: 1.6;
    }

    body {
      background: linear-gradient(180deg, #fdfbf7 0%, #f4f6fb 500px, #f8fafc 100%);
      color: var(--text-main);
      min-height: 100vh;
      display: flex;
      flex-direction: column;
    }

    a {
      color: inherit;
      text-decoration: none;
      transition: all 0.2s ease;
    }

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

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

    .rainbow-bar {
      height: 4px;
      width: 100%;
      background: linear-gradient(90deg, var(--rainbow-1), var(--rainbow-2), var(--rainbow-3), var(--rainbow-4), var(--rainbow-5), var(--rainbow-6), var(--rainbow-7));
    }

    /* 顶部导航 */
    .site-header {
      position: sticky;
      top: 0;
      background-color: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(8px);
      border-bottom: 1px solid var(--border-color);
      z-index: 100;
    }

    .nav-wrapper {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 70px;
    }

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

    .brand-logo {
      height: 40px;
      width: auto;
    }

    .brand-name {
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--text-main);
    }

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

    .nav-links li a {
      padding: 8px 12px;
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--text-muted);
      border-radius: 6px;
    }

    .nav-links li a:hover {
      color: var(--primary);
      background-color: #f1f5f9;
    }

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 9px 20px;
      font-size: 0.95rem;
      font-weight: 600;
      border-radius: 8px;
      border: 1px solid transparent;
      cursor: pointer;
      transition: all 0.25s ease;
      white-space: nowrap;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--rainbow-6), var(--rainbow-7));
      color: #ffffff;
      box-shadow: 0 4px 10px rgba(99, 102, 241, 0.3);
    }

    .btn-primary:hover {
      opacity: 0.95;
      transform: translateY(-1px);
      box-shadow: 0 6px 14px rgba(99, 102, 241, 0.4);
    }

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

    .btn-outline:hover {
      border-color: var(--primary);
      color: var(--primary);
      background-color: #f8fafc;
    }

    /* 移动端菜单开关 */
    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      font-size: 1.5rem;
      color: var(--text-main);
      cursor: pointer;
      padding: 4px;
    }

    /* Hero 首屏 (无图片) */
    .hero-section {
      padding: 70px 0 50px;
      text-align: center;
      position: relative;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 16px;
      border-radius: 9999px;
      background: #eff6ff;
      border: 1px solid #dbeafe;
      color: var(--primary);
      font-size: 0.875rem;
      font-weight: 600;
      margin-bottom: 24px;
    }

    .hero-badge span {
      display: inline-block;
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background-color: var(--rainbow-4);
    }

    .hero-title {
      font-size: 2.5rem;
      font-weight: 800;
      line-height: 1.25;
      color: var(--text-main);
      margin-bottom: 20px;
      letter-spacing: -0.02em;
    }

    .hero-title-gradient {
      background: linear-gradient(135deg, var(--rainbow-1) 0%, var(--rainbow-2) 20%, var(--rainbow-6) 60%, var(--rainbow-7) 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-desc {
      font-size: 1.15rem;
      color: var(--text-muted);
      max-width: 780px;
      margin: 0 auto 36px;
    }

    .hero-cta-group {
      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: 20px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 16px;
      padding: 24px;
      box-shadow: var(--shadow-md);
    }

    .stat-item {
      padding: 12px;
      text-align: center;
      border-right: 1px solid var(--border-color);
    }

    .stat-item:last-child {
      border-right: none;
    }

    .stat-number {
      font-size: 1.75rem;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 4px;
    }

    .stat-label {
      font-size: 0.875rem;
      color: var(--text-muted);
    }

    /* Section 通用 */
    .section {
      padding: 60px 0;
    }

    .section-header {
      text-align: center;
      margin-bottom: 44px;
    }

    .section-tag {
      font-size: 0.85rem;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.05em;
      color: var(--primary);
      margin-bottom: 8px;
      display: inline-block;
    }

    .section-title {
      font-size: 1.85rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 12px;
    }

    .section-subtitle {
      font-size: 1rem;
      color: var(--text-muted);
      max-width: 640px;
      margin: 0 auto;
    }

    /* 平台矩阵与卡片 */
    .card-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
      gap: 24px;
    }

    .feature-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 24px;
      transition: all 0.3s ease;
      display: flex;
      flex-direction: column;
      height: 100%;
      box-shadow: var(--shadow-sm);
      position: relative;
      overflow: hidden;
    }

    .feature-card::before {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      height: 3px;
      background: linear-gradient(90deg, var(--rainbow-5), var(--rainbow-6));
      opacity: 0;
      transition: opacity 0.3s ease;
    }

    .feature-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-lg);
      border-color: #cbd5e1;
    }

    .feature-card:hover::before {
      opacity: 1;
    }

    .feature-icon {
      width: 44px;
      height: 44px;
      border-radius: 10px;
      background: #f1f5f9;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.25rem;
      margin-bottom: 16px;
      color: var(--primary);
    }

    .feature-title {
      font-size: 1.15rem;
      font-weight: 600;
      margin-bottom: 8px;
      color: var(--text-main);
    }

    .feature-desc {
      font-size: 0.9rem;
      color: var(--text-muted);
      line-height: 1.5;
    }

    /* 标签云与模型生态 */
    .tags-container {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-top: 24px;
    }

    .model-tag {
      padding: 6px 14px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 20px;
      font-size: 0.85rem;
      font-weight: 500;
      color: var(--text-main);
      box-shadow: var(--shadow-sm);
      transition: all 0.2s ease;
    }

    .model-tag:hover {
      border-color: var(--primary);
      color: var(--primary);
      transform: scale(1.03);
    }

    /* 对比表格与评测 */
    .rating-banner {
      background: linear-gradient(135deg, #fdf4ff 0%, #eef2ff 100%);
      border: 1px solid #fbcfe8;
      border-radius: var(--radius);
      padding: 24px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 16px;
      margin-bottom: 30px;
    }

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

    .rating-score {
      font-size: 2.25rem;
      font-weight: 800;
      color: var(--rainbow-7);
    }

    .rating-stars {
      color: #eab308;
      font-size: 1.25rem;
    }

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

    .custom-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      font-size: 0.925rem;
    }

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

    .custom-table th {
      background-color: #f8fafc;
      font-weight: 600;
      color: var(--text-main);
    }

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

    .custom-table tr:hover td {
      background-color: #fafbfc;
    }

    .highlight-col {
      background-color: #fdf4ff;
      font-weight: 600;
      color: var(--primary);
    }

    /* 流程与步骤 */
    .steps-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
      gap: 20px;
    }

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

    .step-badge {
      width: 32px;
      height: 32px;
      background: linear-gradient(135deg, var(--rainbow-2), var(--rainbow-1));
      color: #ffffff;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 0.9rem;
      margin-bottom: 16px;
    }

    /* 案例展示区 */
    .media-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
      gap: 24px;
    }

    .media-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }

    .media-img-wrap {
      aspect-ratio: 16 / 9;
      background: #e2e8f0;
      overflow: hidden;
    }

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

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

    .media-body {
      padding: 20px;
    }

    /* 用户评论卡片 */
    .reviews-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
      gap: 24px;
    }

    .review-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .review-text {
      font-size: 0.95rem;
      color: var(--text-muted);
      margin-bottom: 16px;
      line-height: 1.6;
    }

    .review-user {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid #f1f5f9;
      padding-top: 14px;
    }

    .user-avatar-placeholder {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--rainbow-5), var(--rainbow-6));
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 0.9rem;
    }

    .user-meta-name {
      font-size: 0.95rem;
      font-weight: 600;
      color: var(--text-main);
    }

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

    /* FAQ 折叠 */
    .faq-wrapper {
      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;
      transition: all 0.2s ease;
    }

    .faq-question {
      padding: 18px 22px;
      font-size: 1.05rem;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: space-between;
      user-select: none;
    }

    .faq-question::after {
      content: "+";
      font-size: 1.3rem;
      color: var(--primary);
      font-weight: 400;
      transition: transform 0.2s ease;
    }

    .faq-item.active .faq-question::after {
      content: "−";
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      background-color: #fafbfc;
      color: var(--text-muted);
      font-size: 0.925rem;
      line-height: 1.6;
    }

    .faq-answer-inner {
      padding: 0 22px 18px;
    }

    .faq-item.active .faq-answer {
      max-height: 300px;
    }

    /* 表单与联系 */
    .contact-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
    }

    .form-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 32px;
      box-shadow: var(--shadow-sm);
    }

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

    .form-label {
      display: block;
      font-size: 0.875rem;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 6px;
    }

    .form-control {
      width: 100%;
      padding: 10px 14px;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      font-size: 0.95rem;
      color: var(--text-main);
      background-color: #ffffff;
      transition: border-color 0.2s ease;
    }

    .form-control:focus {
      outline: none;
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
    }

    .contact-info-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 32px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .qr-area {
      display: flex;
      align-items: center;
      gap: 20px;
      background: #f8fafc;
      padding: 16px;
      border-radius: 10px;
      margin-top: 20px;
    }

    .qr-img {
      width: 110px;
      height: 110px;
      border-radius: 8px;
      border: 1px solid var(--border-color);
    }

    /* 文章列表 */
    .articles-list {
      display: flex;
      flex-direction: column;
      gap: 12px;
      margin-top: 20px;
    }

    .article-item {
      padding: 14px 18px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      transition: all 0.2s ease;
    }

    .article-item:hover {
      border-color: var(--primary);
      transform: translateX(4px);
    }

    /* 页脚 */
    .site-footer {
      background-color: #ffffff;
      border-top: 1px solid var(--border-color);
      padding: 48px 0 24px;
      margin-top: auto;
      color: var(--text-muted);
      font-size: 0.875rem;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 40px;
      margin-bottom: 32px;
    }

    .footer-title {
      font-size: 1rem;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 16px;
    }

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

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

    .friend-links {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 8px;
    }

    .friend-links a {
      color: var(--text-muted);
    }

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

    .footer-bottom {
      border-top: 1px solid var(--border-color);
      padding-top: 20px;
      text-align: center;
      font-size: 0.825rem;
    }

    /* 浮动客服 */
    .floating-tools {
      position: fixed;
      right: 24px;
      bottom: 30px;
      display: flex;
      flex-direction: column;
      gap: 12px;
      z-index: 99;
    }

    .float-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: #ffffff;
      border: 1px solid var(--border-color);
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: var(--shadow-md);
      cursor: pointer;
      color: var(--text-main);
      transition: all 0.2s ease;
    }

    .float-btn:hover {
      background: var(--primary);
      color: #ffffff;
      border-color: var(--primary);
    }

    /* 响应式适配 */
    @media (max-width: 992px) {
      .hero-stats-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .stat-item:nth-child(2) {
        border-right: none;
      }
      .contact-grid {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
        gap: 24px;
      }
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 70px;
        left: 0;
        right: 0;
        background: #ffffff;
        flex-direction: column;
        padding: 16px 20px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-md);
      }
      .nav-links.active {
        display: flex;
      }
      .mobile-menu-btn {
        display: block;
      }
      .hero-title {
        font-size: 1.85rem;
      }
      .hero-stats-grid {
        grid-template-columns: 1fr;
      }
      .stat-item {
        border-right: none;
        border-bottom: 1px solid var(--border-color);
      }
      .stat-item:last-child {
        border-bottom: none;
      }
    }