:root {
      --primary: #059669;
      --primary-hover: #047857;
      --primary-light: #ecfdf5;
      --primary-glow: #10b981;
      --primary-accent: #34d399;
      --secondary: #0f172a;
      --text-main: #1e293b;
      --text-muted: #64748b;
      --bg-page: #f8fafc;
      --bg-card: #ffffff;
      --border-color: #e2e8f0;
      --border-focus: #10b981;
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.05);
      --shadow-md: 0 4px 12px rgba(5, 150, 105, 0.08);
      --shadow-lg: 0 10px 25px -3px rgba(5, 150, 105, 0.12);
      --radius-sm: 6px;
      --radius-md: 10px;
      --radius-lg: 16px;
      --max-width: 1200px;
      --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, "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;
      overflow-x: hidden;
    }

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

    .container {
      width: 100%;
      max-width: var(--max-width);
      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: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(10px);
      border-bottom: 1px solid var(--border-color);
      transition: var(--transition);
    }

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

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

    .brand-logo img.ai-page-logo {
      height: 38px;
      width: auto;
      object-fit: contain;
    }

    .brand-text {
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--secondary);
      letter-spacing: -0.5px;
    }

    .brand-text span {
      color: var(--primary);
    }

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

    .nav-item a {
      display: inline-block;
      padding: 8px 14px;
      font-size: 0.92rem;
      font-weight: 500;
      color: var(--text-main);
      border-radius: var(--radius-sm);
    }

    .nav-item a:hover {
      color: var(--primary);
      background-color: var(--primary-light);
    }

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 9px 20px;
      font-size: 0.92rem;
      font-weight: 600;
      border-radius: var(--radius-sm);
      cursor: pointer;
      border: 1px solid transparent;
      transition: var(--transition);
      white-space: nowrap;
    }

    .btn-primary {
      background-color: var(--primary);
      color: #ffffff;
      box-shadow: 0 2px 8px rgba(5, 150, 105, 0.25);
    }

    .btn-primary:hover {
      background-color: var(--primary-hover);
      box-shadow: 0 4px 12px rgba(5, 150, 105, 0.35);
      color: #ffffff;
    }

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

    .btn-outline:hover {
      background-color: var(--primary-light);
    }

    .mobile-menu-btn {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: none;
      border: none;
      cursor: pointer;
      padding: 6px;
    }

    .mobile-menu-btn span {
      width: 24px;
      height: 2px;
      background: var(--secondary);
      transition: var(--transition);
    }

    /* 首屏 Hero（无图片，纯CSS布局与动效） */
    .hero-section {
      position: relative;
      padding: 80px 0 90px;
      background: linear-gradient(180deg, #ecfdf5 0%, #f8fafc 100%);
      overflow: hidden;
      border-bottom: 1px solid var(--border-color);
    }

    .hero-decor-circle {
      position: absolute;
      top: -120px;
      right: -80px;
      width: 480px;
      height: 480px;
      background: radial-gradient(circle, rgba(16, 185, 129, 0.15) 0%, rgba(236, 253, 245, 0) 70%);
      border-radius: 50%;
      pointer-events: none;
    }

    .hero-content {
      text-align: center;
      max-width: 860px;
      margin: 0 auto;
      position: relative;
      z-index: 2;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 16px;
      background-color: #ffffff;
      border: 1px solid #a7f3d0;
      border-radius: 999px;
      font-size: 0.86rem;
      font-weight: 600;
      color: var(--primary);
      margin-bottom: 24px;
      box-shadow: var(--shadow-sm);
    }

    .hero-badge-dot {
      width: 8px;
      height: 8px;
      background-color: var(--primary-glow);
      border-radius: 50%;
      box-shadow: 0 0 8px var(--primary-glow);
    }

    .hero-title {
      font-size: 2.75rem;
      line-height: 1.25;
      font-weight: 800;
      color: var(--secondary);
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }

    .hero-desc {
      font-size: 1.15rem;
      color: var(--text-muted);
      margin-bottom: 36px;
      line-height: 1.7;
    }

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

    .btn-hero-portal {
      font-size: 1.05rem;
      padding: 14px 34px;
      background: linear-gradient(135deg, #059669 0%, #10b981 100%);
      color: #ffffff;
      border-radius: var(--radius-md);
      font-weight: 700;
      box-shadow: 0 8px 20px rgba(5, 150, 105, 0.3);
      position: relative;
    }

    .btn-hero-portal:hover {
      transform: translateY(-2px);
      box-shadow: 0 12px 26px rgba(5, 150, 105, 0.4);
      color: #ffffff;
    }

    .hero-stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      background-color: #ffffff;
      padding: 24px 32px;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-md);
      text-align: left;
    }

    .stat-item {
      border-right: 1px solid #f1f5f9;
      padding-right: 16px;
    }

    .stat-item:last-child {
      border-right: none;
      padding-right: 0;
    }

    .stat-value {
      font-size: 1.8rem;
      font-weight: 800;
      color: var(--primary);
      line-height: 1.2;
    }

    .stat-label {
      font-size: 0.88rem;
      color: var(--text-muted);
      margin-top: 4px;
    }

    /* 公共 Section 规范 */
    .section {
      padding: 84px 0;
      border-bottom: 1px solid #f1f5f9;
    }

    .section-alt {
      background-color: #ffffff;
    }

    .section-header {
      text-align: center;
      max-width: 680px;
      margin: 0 auto 52px;
    }

    .section-tag {
      font-size: 0.82rem;
      font-weight: 700;
      color: var(--primary);
      text-transform: uppercase;
      letter-spacing: 1px;
      margin-bottom: 10px;
      display: inline-block;
      background: var(--primary-light);
      padding: 4px 12px;
      border-radius: 4px;
    }

    .section-title {
      font-size: 2rem;
      font-weight: 700;
      color: var(--secondary);
      margin-bottom: 14px;
      line-height: 1.35;
    }

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

    /* 模型矩阵徽章云 */
    .model-matrix-box {
      background: #ffffff;
      padding: 30px;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      margin-bottom: 48px;
      box-shadow: var(--shadow-sm);
    }

    .model-matrix-title {
      font-size: 1.05rem;
      font-weight: 700;
      margin-bottom: 18px;
      color: var(--secondary);
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .model-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
    }

    .model-tag-pill {
      background-color: var(--bg-page);
      border: 1px solid #cbd5e1;
      padding: 6px 14px;
      border-radius: 20px;
      font-size: 0.84rem;
      font-weight: 600;
      color: var(--text-main);
      transition: var(--transition);
    }

    .model-tag-pill:hover {
      background-color: var(--primary-light);
      border-color: var(--primary-glow);
      color: var(--primary);
    }

    /* 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;
      align-items: center;
    }

    .feature-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px;
      transition: var(--transition);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .feature-card:hover {
      border-color: #6ee7b7;
      transform: translateY(-4px);
      box-shadow: var(--shadow-lg);
    }

    .feature-icon-box {
      width: 46px;
      height: 46px;
      background: var(--primary-light);
      color: var(--primary);
      border-radius: var(--radius-sm);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.3rem;
      margin-bottom: 18px;
    }

    .feature-card h3 {
      font-size: 1.2rem;
      color: var(--secondary);
      margin-bottom: 10px;
    }

    .feature-card p {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.65;
      flex-grow: 1;
    }

    .feature-badge-row {
      margin-top: 16px;
      display: flex;
      gap: 8px;
      flex-wrap: wrap;
    }

    .feature-badge-item {
      font-size: 0.78rem;
      padding: 2px 8px;
      background: #f1f5f9;
      color: #475569;
      border-radius: 4px;
    }

    /* 场景矩阵列表 */
    .scenario-item {
      background: #ffffff;
      border-left: 4px solid var(--primary);
      border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
      padding: 20px 22px;
      box-shadow: var(--shadow-sm);
      border-top: 1px solid #f1f5f9;
      border-right: 1px solid #f1f5f9;
      border-bottom: 1px solid #f1f5f9;
      transition: var(--transition);
    }

    .scenario-item:hover {
      transform: translateX(4px);
      box-shadow: var(--shadow-md);
    }

    .scenario-item h4 {
      font-size: 1.05rem;
      color: var(--secondary);
      margin-bottom: 6px;
    }

    .scenario-item p {
      font-size: 0.88rem;
      color: var(--text-muted);
      line-height: 1.55;
    }

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

    .step-number {
      position: absolute;
      top: 18px;
      right: 18px;
      font-size: 2rem;
      font-weight: 800;
      color: #d1fae5;
      line-height: 1;
    }

    .step-card h4 {
      font-size: 1.1rem;
      color: var(--secondary);
      margin-bottom: 8px;
    }

    .step-card p {
      font-size: 0.88rem;
      color: var(--text-muted);
    }

    /* 评测模块与卡片 */
    .review-highlight-banner {
      background: linear-gradient(135deg, #059669 0%, #065f46 100%);
      color: #ffffff;
      padding: 32px;
      border-radius: var(--radius-lg);
      margin-bottom: 36px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 20px;
    }

    .rating-score-box {
      display: flex;
      align-items: baseline;
      gap: 12px;
    }

    .rating-big-num {
      font-size: 3.5rem;
      font-weight: 900;
      line-height: 1;
      color: #ffffff;
    }

    .rating-stars {
      color: #facc15;
      font-size: 1.4rem;
      letter-spacing: 2px;
    }

    .table-container {
      width: 100%;
      overflow-x: auto;
      background: #ffffff;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

    .comparison-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      font-size: 0.92rem;
    }

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

    .comparison-table th {
      background-color: #f8fafc;
      font-weight: 700;
      color: var(--secondary);
    }

    .comparison-table tr.highlight-row {
      background-color: #f0fdf4;
      font-weight: 600;
    }

    .comparison-table td.brand-col {
      color: var(--primary);
      font-weight: 700;
    }

    /* 素材图片区域容器规范 */
    .media-card {
      background: #ffffff;
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }

    .media-card:hover {
      box-shadow: var(--shadow-lg);
    }

    .media-img-wrapper {
      position: relative;
      width: 100%;
      aspect-ratio: 16 / 9;
      background-color: #f1f5f9;
      overflow: hidden;
    }

    .media-img-wrapper.square {
      aspect-ratio: 1 / 1;
    }

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

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

    .media-info {
      padding: 20px;
    }

    .media-info h4 {
      font-size: 1.05rem;
      color: var(--secondary);
      margin-bottom: 6px;
    }

    .media-info p {
      font-size: 0.86rem;
      color: var(--text-muted);
    }

    /* 客户评价板块 */
    .testimonial-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;
      box-shadow: var(--shadow-sm);
    }

    .testimonial-text {
      font-size: 0.92rem;
      color: #334155;
      line-height: 1.6;
      margin-bottom: 18px;
      font-style: italic;
    }

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

    .author-avatar {
      width: 40px;
      height: 40px;
      background: var(--primary-light);
      color: var(--primary);
      font-weight: 700;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 0.95rem;
    }

    .author-name {
      font-size: 0.9rem;
      font-weight: 700;
      color: var(--secondary);
    }

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

    /* FAQ 手风琴 */
    .faq-accordion {
      max-width: 900px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }

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

    .faq-item.active {
      border-color: #6ee7b7;
      box-shadow: var(--shadow-sm);
    }

    .faq-question {
      padding: 18px 24px;
      font-size: 1rem;
      font-weight: 600;
      color: var(--secondary);
      display: flex;
      align-items: center;
      justify-content: space-between;
      cursor: pointer;
      user-select: none;
    }

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

    .faq-icon {
      font-size: 1.2rem;
      transition: transform 0.25s ease;
      color: var(--text-muted);
    }

    .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;
      background-color: #fafbfc;
    }

    .faq-answer-inner {
      padding: 0 24px 20px;
      font-size: 0.92rem;
      color: #475569;
      line-height: 1.7;
    }

    /* 表单板块 */
    .contact-grid {
      display: grid;
      grid-template-columns: 1.2fr 1fr;
      gap: 36px;
      align-items: start;
    }

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

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

    .form-label {
      display: block;
      font-size: 0.88rem;
      font-weight: 600;
      color: var(--secondary);
      margin-bottom: 6px;
    }

    .form-control {
      width: 100%;
      padding: 12px 14px;
      border: 1px solid #cbd5e1;
      border-radius: var(--radius-sm);
      font-size: 0.92rem;
      color: var(--text-main);
      background-color: #ffffff;
      outline: none;
      transition: var(--transition);
      font-family: inherit;
    }

    .form-control:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.2);
    }

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

    .contact-info-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 32px;
      display: flex;
      flex-direction: column;
      gap: 24px;
    }

    .contact-channel-item {
      display: flex;
      gap: 14px;
      align-items: flex-start;
    }

    .contact-channel-icon {
      width: 40px;
      height: 40px;
      background: var(--primary-light);
      color: var(--primary);
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      flex-shrink: 0;
      font-weight: 700;
    }

    .contact-channel-detail h4 {
      font-size: 0.95rem;
      color: var(--secondary);
      margin-bottom: 2px;
    }

    .contact-channel-detail p {
      font-size: 0.88rem;
      color: var(--text-muted);
    }

    .qrcode-box {
      border-top: 1px solid var(--border-color);
      padding-top: 20px;
      display: flex;
      gap: 20px;
      align-items: center;
    }

    .qrcode-img-wrap {
      width: 108px;
      height: 108px;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      padding: 4px;
      background: #ffffff;
    }

    .qrcode-img-wrap img {
      width: 100%;
      height: 100%;
      object-fit: contain;
      display: block;
    }

    .qrcode-text h4 {
      font-size: 0.95rem;
      color: var(--secondary);
      margin-bottom: 4px;
    }

    .qrcode-text p {
      font-size: 0.82rem;
      color: var(--text-muted);
      line-height: 1.5;
    }

    /* 资讯列表 */
    .article-list {
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .article-item {
      display: flex;
      align-items: center;
      justify-content: space-between;
      background: #ffffff;
      padding: 16px 20px;
      border-radius: var(--radius-sm);
      border: 1px solid var(--border-color);
      transition: var(--transition);
    }

    .article-item:hover {
      border-color: #6ee7b7;
      transform: translateX(4px);
    }

    .article-title {
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--text-main);
    }

    .article-link-tag {
      font-size: 0.82rem;
      color: var(--primary);
      font-weight: 600;
      white-space: nowrap;
      margin-left: 12px;
    }

    /* 友情链接与页脚 */
    .footer-section {
      background-color: #0f172a;
      color: #94a3b8;
      padding: 60px 0 24px;
      border-top: 1px solid #1e293b;
    }

    .footer-links-box {
      border-bottom: 1px solid #1e293b;
      padding-bottom: 30px;
      margin-bottom: 30px;
    }

    .footer-links-box h4 {
      font-size: 0.95rem;
      color: #f8fafc;
      margin-bottom: 14px;
    }

    .friendly-links-wrap {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
    }

    .friendly-links-wrap a {
      color: #94a3b8;
      font-size: 0.86rem;
      transition: var(--transition);
    }

    .friendly-links-wrap a:hover {
      color: var(--primary-glow);
    }

    .footer-bottom {
      display: flex;
      align-items: center;
      justify-content: space-between;
      font-size: 0.84rem;
      flex-wrap: wrap;
      gap: 12px;
    }

    .footer-bottom a {
      color: #cbd5e1;
    }

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

    /* 悬浮工具条 */
    .floating-tools {
      position: fixed;
      right: 24px;
      bottom: 30px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .tool-btn {
      width: 46px;
      height: 46px;
      border-radius: 50%;
      background-color: #ffffff;
      color: var(--secondary);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-md);
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      transition: var(--transition);
      font-size: 1.1rem;
      position: relative;
    }

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

    .tool-popup {
      position: absolute;
      right: 56px;
      bottom: 0;
      width: 160px;
      background: #ffffff;
      padding: 12px;
      border-radius: 8px;
      box-shadow: var(--shadow-lg);
      border: 1px solid var(--border-color);
      display: none;
      text-align: center;
    }

    .tool-popup img {
      width: 100%;
      height: auto;
      display: block;
      border-radius: 4px;
    }

    .tool-btn:hover .tool-popup {
      display: block;
    }

    /* 响应式适配 */
    @media (max-width: 992px) {
      .hero-title {
        font-size: 2.1rem;
      }
      .grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-4 {
        grid-template-columns: repeat(2, 1fr);
      }
      .contact-grid {
        grid-template-columns: 1fr;
      }
    }

    @media (max-width: 768px) {
      .nav-links {
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #ffffff;
        flex-direction: column;
        padding: 20px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-md);
        display: none;
      }
      .nav-links.active {
        display: flex;
      }
      .mobile-menu-btn {
        display: flex;
      }
      .hero-stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 16px;
      }
      .stat-item {
        border-right: none;
      }
      .grid-3, .grid-4, .grid-2 {
        grid-template-columns: 1fr;
      }
      .hero-title {
        font-size: 1.75rem;
      }
      .section {
        padding: 56px 0;
      }
      .review-highlight-banner {
        flex-direction: column;
        align-items: flex-start;
      }
      .floating-tools {
        right: 16px;
        bottom: 20px;
      }
    }