:root {
      --primary-color: #0d9488;
      --primary-hover: #0f766e;
      --primary-light: #f0fdf4;
      --mint-bg: #e6f7f2;
      --mint-subtle: #f4faf8;
      --mint-accent: #10b981;
      --mint-border: #a7f3d0;
      --text-main: #132a24;
      --text-muted: #4a635d;
      --text-light: #718d86;
      --white: #ffffff;
      --card-bg: #ffffff;
      --card-border: #d1fae5;
      --card-shadow: 0 10px 30px -5px rgba(13, 148, 136, 0.08);
      --card-shadow-hover: 0 18px 36px -4px rgba(13, 148, 136, 0.16);
      --container-max: 1200px;
      --radius-sm: 8px;
      --radius-md: 12px;
      --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, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: #f7fdfb;
      color: var(--text-main);
      line-height: 1.65;
      overflow-x: hidden;
      -webkit-font-smoothing: antialiased;
    }

    .container {
      width: 100%;
      max-width: var(--container-max);
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }

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

    /* 顶部导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.94);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--card-border);
      box-shadow: 0 2px 12px rgba(13, 148, 136, 0.05);
    }

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

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

    .nav-brand .ai-page-logo {
      height: 42px;
      width: auto;
      object-fit: contain;
    }

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

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

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

    .nav-links li a {
      display: block;
      padding: 8px 14px;
      color: var(--text-main);
      font-size: 0.93rem;
      font-weight: 500;
      border-radius: var(--radius-sm);
    }

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

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

    .btn-nav-primary {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 9px 20px;
      background-color: var(--primary-color);
      color: var(--white) !important;
      font-size: 0.92rem;
      font-weight: 600;
      border-radius: 999px;
      box-shadow: 0 4px 14px rgba(13, 148, 136, 0.25);
    }

    .btn-nav-primary:hover {
      background-color: var(--primary-hover);
      box-shadow: 0 6px 18px rgba(13, 148, 136, 0.35);
      transform: translateY(-1px);
    }

    .mobile-menu-toggle {
      display: none;
      background: transparent;
      border: 1px solid var(--card-border);
      padding: 8px;
      border-radius: var(--radius-sm);
      cursor: pointer;
      color: var(--text-main);
    }

    /* Hero 首屏 - 严禁图片，纯CSS与科技卡片构建 */
    .hero-section {
      position: relative;
      padding: 80px 0 90px;
      background: radial-gradient(circle at 10% 20%, rgba(204, 251, 241, 0.5) 0%, rgba(247, 253, 251, 0) 50%),
                  radial-gradient(circle at 90% 80%, rgba(167, 243, 208, 0.4) 0%, rgba(247, 253, 251, 0) 50%);
      border-bottom: 1px solid var(--card-border);
      overflow: hidden;
    }

    .hero-content {
      text-align: center;
      max-width: 860px;
      margin: 0 auto;
    }

    .hero-tag {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 16px;
      background-color: var(--mint-bg);
      border: 1px solid var(--mint-border);
      border-radius: 999px;
      color: var(--primary-color);
      font-size: 0.88rem;
      font-weight: 600;
      margin-bottom: 20px;
    }

    .hero-tag::before {
      content: "";
      display: inline-block;
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background-color: var(--mint-accent);
      box-shadow: 0 0 8px var(--mint-accent);
    }

    .hero-title {
      font-size: 2.85rem;
      line-height: 1.25;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 22px;
      letter-spacing: -0.8px;
    }

    .hero-title .highlight {
      color: var(--primary-color);
      position: relative;
      display: inline-block;
    }

    .hero-title .highlight::after {
      content: "";
      position: absolute;
      left: 0;
      bottom: 4px;
      width: 100%;
      height: 8px;
      background: rgba(16, 185, 129, 0.2);
      border-radius: 4px;
      z-index: -1;
    }

    .hero-subtitle {
      font-size: 1.15rem;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 36px;
      max-width: 720px;
      margin-left: auto;
      margin-right: auto;
    }

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

    .btn-hero-main {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      padding: 14px 34px;
      background-color: var(--primary-color);
      color: var(--white) !important;
      font-size: 1.05rem;
      font-weight: 700;
      border-radius: 999px;
      box-shadow: 0 8px 24px rgba(13, 148, 136, 0.28);
    }

    .btn-hero-main:hover {
      background-color: var(--primary-hover);
      box-shadow: 0 12px 30px rgba(13, 148, 136, 0.38);
      transform: translateY(-2px);
    }

    .btn-hero-sub {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 14px 28px;
      background-color: var(--white);
      color: var(--text-main);
      font-size: 1.02rem;
      font-weight: 600;
      border-radius: 999px;
      border: 1px solid var(--card-border);
      box-shadow: 0 4px 12px rgba(0, 0, 0, 0.03);
    }

    .btn-hero-sub:hover {
      background-color: var(--mint-bg);
      color: var(--primary-color);
      border-color: var(--mint-border);
      transform: translateY(-2px);
    }

    .hero-stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 18px;
      text-align: left;
    }

    .hero-stat-card {
      background: var(--white);
      border: 1px solid var(--card-border);
      padding: 20px 22px;
      border-radius: var(--radius-md);
      box-shadow: var(--card-shadow);
      transition: var(--transition);
    }

    .hero-stat-card:hover {
      transform: translateY(-3px);
      box-shadow: var(--card-shadow-hover);
      border-color: var(--mint-border);
    }

    .stat-number {
      font-size: 1.8rem;
      font-weight: 800;
      color: var(--primary-color);
      line-height: 1.2;
      margin-bottom: 4px;
    }

    .stat-label {
      font-size: 0.88rem;
      color: var(--text-muted);
      font-weight: 500;
    }

    /* Section 公共结构 */
    .section {
      padding: 88px 0;
      position: relative;
    }

    .section-alt {
      background-color: #f1faf6;
    }

    .section-header {
      text-align: center;
      max-width: 720px;
      margin: 0 auto 56px;
    }

    .section-eyebrow {
      font-size: 0.85rem;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 1px;
      color: var(--primary-color);
      background: var(--mint-bg);
      display: inline-block;
      padding: 4px 14px;
      border-radius: 999px;
      margin-bottom: 12px;
      border: 1px solid var(--mint-border);
    }

    .section-title {
      font-size: 2.1rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 14px;
      letter-spacing: -0.5px;
    }

    .section-subtitle {
      font-size: 1rem;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* 模型矩阵徽章云 */
    .model-badge-wrapper {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 10px;
      margin-top: 24px;
    }

    .model-badge {
      padding: 6px 14px;
      background: var(--white);
      border: 1px solid var(--card-border);
      border-radius: 999px;
      font-size: 0.86rem;
      font-weight: 600;
      color: var(--text-main);
      box-shadow: 0 2px 6px rgba(0, 0, 0, 0.02);
      transition: var(--transition);
    }

    .model-badge:hover {
      background: var(--mint-bg);
      border-color: var(--primary-color);
      color: var(--primary-color);
      transform: translateY(-2px);
    }

    /* 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;
    }

    /* 功能与场景卡片 */
    .feature-card {
      background: var(--white);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-md);
      padding: 28px;
      box-shadow: var(--card-shadow);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

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

    .card-icon-box {
      width: 50px;
      height: 50px;
      border-radius: var(--radius-sm);
      background: var(--mint-bg);
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary-color);
      font-weight: 800;
      font-size: 1.25rem;
      margin-bottom: 20px;
      border: 1px solid var(--mint-border);
    }

    .card-title {
      font-size: 1.2rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 10px;
    }

    .card-desc {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.65;
      margin-bottom: 16px;
    }

    .card-tag {
      align-self: flex-start;
      font-size: 0.78rem;
      font-weight: 600;
      padding: 3px 10px;
      border-radius: 999px;
      background-color: var(--primary-light);
      color: var(--primary-color);
      border: 1px solid var(--mint-border);
    }

    /* 图文混排与案例区 */
    .media-card {
      background: var(--white);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--card-shadow);
      transition: var(--transition);
    }

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

    .media-card .img-wrap {
      width: 100%;
      height: 220px;
      background-color: var(--mint-bg);
      overflow: hidden;
    }

    .media-card .img-wrap img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.5s ease;
    }

    .media-card:hover .img-wrap img {
      transform: scale(1.04);
    }

    .media-content {
      padding: 24px;
    }

    /* 流程步骤 */
    .process-timeline {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      position: relative;
    }

    .process-card {
      background: var(--white);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-md);
      padding: 28px 22px;
      position: relative;
      box-shadow: var(--card-shadow);
    }

    .process-step-num {
      width: 36px;
      height: 36px;
      border-radius: 50%;
      background: var(--primary-color);
      color: var(--white);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      margin-bottom: 16px;
      box-shadow: 0 4px 10px rgba(13, 148, 136, 0.3);
    }

    /* 评测与对比表格 */
    .review-highlight-card {
      background: linear-gradient(135deg, #ffffff 0%, #edfbf6 100%);
      border: 2px solid var(--mint-border);
      border-radius: var(--radius-lg);
      padding: 36px;
      margin-bottom: 36px;
      box-shadow: var(--card-shadow);
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 24px;
    }

    .review-score-area {
      display: flex;
      align-items: baseline;
      gap: 12px;
    }

    .score-big {
      font-size: 3.5rem;
      font-weight: 900;
      color: var(--primary-color);
      line-height: 1;
    }

    .score-max {
      font-size: 1.2rem;
      color: var(--text-muted);
      font-weight: 600;
    }

    .star-rating {
      color: #f59e0b;
      font-size: 1.4rem;
      letter-spacing: 2px;
    }

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

    .compare-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 680px;
    }

    .compare-table th,
    .compare-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--card-border);
      font-size: 0.93rem;
    }

    .compare-table th {
      background-color: var(--mint-subtle);
      color: var(--text-main);
      font-weight: 700;
    }

    .compare-table tr:hover {
      background-color: #f9fdfc;
    }

    .badge-highlight {
      display: inline-block;
      padding: 4px 10px;
      background-color: var(--primary-color);
      color: var(--white);
      border-radius: 6px;
      font-weight: 600;
      font-size: 0.82rem;
    }

    /* 用户评论 */
    .testimonial-card {
      background: var(--white);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-md);
      padding: 26px;
      box-shadow: var(--card-shadow);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      transition: var(--transition);
    }

    .testimonial-card:hover {
      transform: translateY(-3px);
      box-shadow: var(--card-shadow-hover);
      border-color: var(--mint-border);
    }

    .testimonial-text {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 18px;
    }

    .user-info {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid #f0fdf4;
      padding-top: 14px;
    }

    .user-avatar-tag {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      background: var(--mint-bg);
      color: var(--primary-color);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 0.95rem;
      border: 1px solid var(--mint-border);
    }

    .user-name {
      font-size: 0.95rem;
      font-weight: 700;
      color: var(--text-main);
    }

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

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

    .faq-item {
      background: var(--white);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--card-shadow);
      transition: var(--transition);
    }

    .faq-question {
      padding: 20px 24px;
      font-size: 1.02rem;
      font-weight: 700;
      color: var(--text-main);
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: space-between;
      user-select: none;
    }

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

    .faq-icon {
      font-size: 1.25rem;
      color: var(--primary-color);
      transition: transform 0.25s ease;
    }

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

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      background-color: #fafdfc;
    }

    .faq-answer-inner {
      padding: 0 24px 20px;
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* 表单区域 */
    .form-wrapper {
      background: var(--white);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-lg);
      padding: 40px;
      box-shadow: var(--card-shadow);
    }

    .contact-grid {
      display: grid;
      grid-template-columns: 1.2fr 1fr;
      gap: 40px;
    }

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

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

    .form-control {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid var(--card-border);
      border-radius: var(--radius-sm);
      font-size: 0.92rem;
      color: var(--text-main);
      background-color: #fbfdfc;
      transition: var(--transition);
      outline: none;
    }

    .form-control:focus {
      border-color: var(--primary-color);
      background-color: var(--white);
      box-shadow: 0 0 0 3px rgba(13, 148, 136, 0.12);
    }

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

    .btn-submit {
      width: 100%;
      padding: 14px;
      background-color: var(--primary-color);
      color: var(--white);
      font-size: 1rem;
      font-weight: 700;
      border: none;
      border-radius: var(--radius-sm);
      cursor: pointer;
      box-shadow: 0 6px 18px rgba(13, 148, 136, 0.25);
      transition: var(--transition);
    }

    .btn-submit:hover {
      background-color: var(--primary-hover);
      box-shadow: 0 8px 24px rgba(13, 148, 136, 0.35);
    }

    .qr-card {
      background: var(--mint-subtle);
      border: 1px solid var(--mint-border);
      border-radius: var(--radius-md);
      padding: 28px;
      text-align: center;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
    }

    .qr-img-box {
      width: 160px;
      height: 160px;
      background: var(--white);
      padding: 8px;
      border-radius: var(--radius-sm);
      border: 1px solid var(--card-border);
      margin-bottom: 16px;
    }

    .qr-img-box img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }

    .contact-item-row {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-top: 12px;
      font-size: 0.9rem;
      color: var(--text-muted);
    }

    /* 资讯与文章列表 */
    .article-links-box {
      background: var(--white);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--card-shadow);
    }

    .article-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .article-list li {
      border-bottom: 1px dashed var(--card-border);
      padding-bottom: 10px;
    }

    .article-list li:last-child {
      border-bottom: none;
      padding-bottom: 0;
    }

    .article-list a {
      color: var(--text-main);
      font-size: 0.93rem;
      font-weight: 500;
      display: flex;
      align-items: center;
      justify-content: space-between;
    }

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

    /* 页脚与友情链接 */
    .site-footer {
      background-color: #0b1f1a;
      color: #e2ece9;
      padding: 60px 0 30px;
      border-top: 1px solid #133a30;
    }

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

    .footer-col h4 {
      font-size: 1.05rem;
      font-weight: 700;
      color: #ffffff;
      margin-bottom: 18px;
    }

    .footer-col p {
      font-size: 0.88rem;
      color: #9eb5af;
      line-height: 1.7;
    }

    .footer-links {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .footer-links a {
      color: #b7ccc7;
      font-size: 0.88rem;
    }

    .footer-links a:hover {
      color: #34d399;
    }

    .friend-links-area {
      border-top: 1px solid #1a3f35;
      padding-top: 24px;
      margin-top: 24px;
    }

    .friend-links-title {
      font-size: 0.88rem;
      font-weight: 700;
      color: #9eb5af;
      margin-bottom: 12px;
    }

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

    .friend-links-list a {
      color: #8da49e;
      font-size: 0.84rem;
    }

    .friend-links-list a:hover {
      color: #34d399;
    }

    .footer-bottom {
      border-top: 1px solid #1a3f35;
      padding-top: 24px;
      margin-top: 30px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      font-size: 0.84rem;
      color: #7b9690;
    }

    /* 悬浮客服栏与返回顶部 */
    .floating-tools {
      position: fixed;
      right: 20px;
      bottom: 30px;
      display: flex;
      flex-direction: column;
      gap: 10px;
      z-index: 999;
    }

    .float-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: var(--white);
      color: var(--primary-color);
      box-shadow: 0 4px 16px rgba(0, 0, 0, 0.12);
      border: 1px solid var(--mint-border);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.1rem;
      cursor: pointer;
      transition: var(--transition);
    }

    .float-btn:hover {
      background: var(--primary-color);
      color: var(--white);
      transform: translateY(-2px);
    }

    /* 响应式调整 */
    @media (max-width: 992px) {
      .hero-title {
        font-size: 2.2rem;
      }
      .grid-4 {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
      .hero-stats-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .process-timeline {
        grid-template-columns: repeat(2, 1fr);
      }
      .contact-grid {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: var(--white);
        flex-direction: column;
        padding: 20px 0;
        border-bottom: 1px solid var(--card-border);
        box-shadow: 0 10px 20px rgba(0, 0, 0, 0.05);
      }
      .nav-links.active {
        display: flex;
      }
      .mobile-menu-toggle {
        display: block;
      }
      .hero-title {
        font-size: 1.85rem;
      }
      .grid-3, .grid-4, .grid-2 {
        grid-template-columns: 1fr;
      }
      .hero-stats-grid {
        grid-template-columns: 1fr;
      }
      .process-timeline {
        grid-template-columns: 1fr;
      }
      .review-highlight-card {
        flex-direction: column;
        text-align: center;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .footer-bottom {
        flex-direction: column;
        gap: 12px;
        text-align: center;
      }
    }