:root {
      --primary: #00b365;
      --primary-dark: #008f51;
      --primary-light: #e8f9f1;
      --primary-bright: #10d87d;
      --accent: #0f172a;
      --text-main: #1f2d24;
      --text-muted: #526359;
      --bg-page: #f6fbf8;
      --bg-card: #ffffff;
      --border-color: #d8ecdf;
      --border-focus: #00b365;
      --shadow-sm: 0 4px 12px rgba(0, 179, 101, 0.08);
      --shadow-md: 0 8px 24px rgba(0, 179, 101, 0.12);
      --shadow-lg: 0 16px 36px rgba(0, 179, 101, 0.16);
      --radius: 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, "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;
      transition: var(--transition);
    }

    .container {
      width: 100%;
      max-width: 1240px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 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);
      box-shadow: 0 2px 10px rgba(0, 0, 0, 0.03);
    }

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

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

    .brand-box .ai-page-logo {
      height: 38px;
      width: auto;
      display: block;
    }

    .brand-title {
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--text-main);
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .brand-badge {
      background: var(--primary);
      color: #fff;
      font-size: 0.72rem;
      padding: 2px 8px;
      border-radius: 99px;
      font-weight: 600;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
    }

    .nav-links a {
      padding: 8px 14px;
      font-size: 0.92rem;
      font-weight: 500;
      color: var(--text-muted);
      border-radius: 6px;
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary-dark);
      background: var(--primary-light);
    }

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      font-size: 0.95rem;
      font-weight: 600;
      padding: 10px 22px;
      border-radius: 8px;
      cursor: pointer;
      border: 1px solid transparent;
      transition: var(--transition);
      white-space: nowrap;
    }

    .btn-primary {
      background: var(--primary);
      color: #ffffff;
      box-shadow: 0 4px 14px rgba(0, 179, 101, 0.35);
    }

    .btn-primary:hover {
      background: var(--primary-dark);
      transform: translateY(-2px);
      box-shadow: 0 6px 18px rgba(0, 179, 101, 0.45);
    }

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

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

    .btn-lg {
      padding: 14px 32px;
      font-size: 1.05rem;
      border-radius: 10px;
    }

    .menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.5rem;
      color: var(--text-main);
      cursor: pointer;
    }

    /* 首屏纯CSS视觉构建（无任何外部/内部图片） */
    .hero-section {
      position: relative;
      padding: 80px 0 60px;
      background: linear-gradient(180deg, #f0fbf5 0%, #f6fbf8 100%);
      overflow: hidden;
      border-bottom: 1px solid var(--border-color);
    }

    .hero-bg-shape-1 {
      position: absolute;
      top: -100px;
      right: -100px;
      width: 480px;
      height: 480px;
      background: radial-gradient(circle, rgba(16, 216, 125, 0.18) 0%, rgba(255, 255, 255, 0) 70%);
      border-radius: 50%;
      pointer-events: none;
    }

    .hero-bg-shape-2 {
      position: absolute;
      bottom: -60px;
      left: -60px;
      width: 380px;
      height: 380px;
      background: radial-gradient(circle, rgba(0, 179, 101, 0.14) 0%, rgba(255, 255, 255, 0) 70%);
      border-radius: 50%;
      pointer-events: none;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1.15fr 0.85fr;
      gap: 48px;
      align-items: center;
      position: relative;
      z-index: 2;
    }

    .hero-tag-bar {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: #e1f7ec;
      border: 1px solid #b7ebd0;
      color: var(--primary-dark);
      padding: 6px 14px;
      border-radius: 99px;
      font-size: 0.86rem;
      font-weight: 600;
      margin-bottom: 20px;
    }

    .hero-tag-bar span.pulse-dot {
      width: 8px;
      height: 8px;
      background: var(--primary);
      border-radius: 50%;
      box-shadow: 0 0 0 4px rgba(0, 179, 101, 0.25);
    }

    .hero-title {
      font-size: 2.5rem;
      line-height: 1.25;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }

    .hero-title .highlight {
      color: var(--primary-dark);
      background: linear-gradient(120deg, rgba(0, 179, 101, 0.15) 0%, rgba(16, 216, 125, 0.3) 100%);
      padding: 0 6px;
      border-radius: 4px;
    }

    .hero-desc {
      font-size: 1.1rem;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 32px;
    }

    .hero-actions {
      display: flex;
      align-items: center;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 36px;
    }

    .hero-features-list {
      display: flex;
      flex-wrap: wrap;
      gap: 18px;
      font-size: 0.88rem;
      color: var(--text-muted);
      border-top: 1px dashed #d1e9db;
      padding-top: 20px;
    }

    .hero-features-list span {
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .hero-features-list svg {
      width: 16px;
      height: 16px;
      fill: var(--primary);
    }

    /* 首屏纯CSS科技数据卡 */
    .hero-tech-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 32px;
      box-shadow: var(--shadow-lg);
      position: relative;
    }

    .tech-card-header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      margin-bottom: 24px;
      padding-bottom: 16px;
      border-bottom: 1px solid #f0f7f2;
    }

    .tech-title {
      font-size: 1.05rem;
      font-weight: 700;
      color: var(--text-main);
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .tech-badge {
      font-size: 0.75rem;
      background: #e8f9f1;
      color: var(--primary-dark);
      padding: 4px 10px;
      border-radius: 6px;
      font-weight: 600;
    }

    .tech-metrics-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 16px;
      margin-bottom: 24px;
    }

    .metric-box {
      background: #f8fcf9;
      border: 1px solid #e2f2e8;
      padding: 16px;
      border-radius: 12px;
    }

    .metric-val {
      font-size: 1.6rem;
      font-weight: 800;
      color: var(--primary-dark);
      line-height: 1.2;
    }

    .metric-name {
      font-size: 0.8rem;
      color: var(--text-muted);
      margin-top: 4px;
    }

    .model-pills-bar {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
    }

    .model-pill {
      font-size: 0.76rem;
      background: #edf7f1;
      color: #2b553e;
      padding: 4px 10px;
      border-radius: 6px;
      font-weight: 500;
    }

    /* 通用Section */
    .section-block {
      padding: 72px 0;
      position: relative;
    }

    .section-block.alt-bg {
      background: #ffffff;
    }

    .section-head {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 52px;
    }

    .section-kicker {
      display: inline-block;
      font-size: 0.85rem;
      font-weight: 700;
      color: var(--primary-dark);
      background: var(--primary-light);
      padding: 4px 14px;
      border-radius: 99px;
      margin-bottom: 12px;
      text-transform: uppercase;
      letter-spacing: 0.5px;
    }

    .section-title {
      font-size: 2rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 14px;
    }

    .section-desc {
      font-size: 1rem;
      color: var(--text-muted);
      line-height: 1.65;
    }

    /* 网格卡片 */
    .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;
    }

    .card-item {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 28px 24px;
      transition: var(--transition);
      display: flex;
      flex-direction: column;
      height: 100%;
    }

    .card-item:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: #aae2c2;
    }

    .card-icon-wrap {
      width: 50px;
      height: 50px;
      background: #e5f8ee;
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
      color: var(--primary-dark);
    }

    .card-icon-wrap svg {
      width: 26px;
      height: 26px;
      fill: currentColor;
    }

    .card-h3 {
      font-size: 1.2rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 12px;
    }

    .card-text {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.6;
      flex-grow: 1;
    }

    .card-badge {
      display: inline-block;
      margin-top: 16px;
      font-size: 0.78rem;
      font-weight: 600;
      color: var(--primary-dark);
      background: #ecf9f2;
      padding: 4px 10px;
      border-radius: 6px;
      align-self: flex-start;
    }

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

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

    .step-num {
      width: 36px;
      height: 36px;
      background: var(--primary);
      color: #ffffff;
      font-weight: 700;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 16px;
      font-size: 0.95rem;
    }

    /* 对比评测表 */
    .eval-box {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 36px;
      box-shadow: var(--shadow-sm);
    }

    .eval-top {
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 20px;
      margin-bottom: 28px;
      padding-bottom: 24px;
      border-bottom: 1px solid #ebf5ee;
    }

    .rating-summary {
      display: flex;
      align-items: center;
      gap: 20px;
    }

    .rating-score {
      font-size: 3rem;
      font-weight: 800;
      color: var(--primary-dark);
      line-height: 1;
    }

    .rating-stars {
      color: #ff9800;
      font-size: 1.2rem;
      letter-spacing: 2px;
    }

    .eval-table-container {
      width: 100%;
      overflow-x: auto;
    }

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

    .eval-table th,
    .eval-table td {
      padding: 16px 20px;
      border-bottom: 1px solid #ebf5ee;
      font-size: 0.92rem;
    }

    .eval-table th {
      background: #f7fbf8;
      color: var(--text-main);
      font-weight: 700;
    }

    .eval-table tr:hover td {
      background: #f9fdfa;
    }

    .tag-better {
      color: var(--primary-dark);
      font-weight: 700;
      background: #e8f9f1;
      padding: 4px 10px;
      border-radius: 6px;
      display: inline-block;
    }

    /* 案例展示区图片容器 */
    .media-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      overflow: hidden;
      display: flex;
      flex-direction: column;
    }

    .media-card-img-wrap {
      width: 100%;
      background: #edf7f1;
      overflow: hidden;
    }

    .media-card-img-wrap img {
      width: 100%;
      height: auto;
      display: block;
      transition: var(--transition);
      object-fit: contain;
    }

    .media-card:hover .media-card-img-wrap img {
      transform: scale(1.02);
    }

    .media-card-body {
      padding: 20px;
      flex-grow: 1;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    /* 用户评论 */
    .review-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 24px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      height: 100%;
    }

    .review-user-info {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-top: 18px;
      padding-top: 14px;
      border-top: 1px solid #f2f8f4;
    }

    .user-avatar-badge {
      width: 42px;
      height: 42px;
      border-radius: 50%;
      background: var(--primary);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1rem;
    }

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

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

    /* FAQ 手风琴 */
    .faq-wrapper {
      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: 10px;
      overflow: hidden;
      transition: var(--transition);
    }

    .faq-item.active {
      border-color: #92dfb3;
      box-shadow: var(--shadow-sm);
    }

    .faq-question {
      padding: 20px 24px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      cursor: pointer;
      font-weight: 700;
      font-size: 1.05rem;
      color: var(--text-main);
      background: #ffffff;
    }

    .faq-icon-arrow {
      width: 20px;
      height: 20px;
      fill: var(--text-muted);
      transition: transform 0.28s ease;
    }

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

    .faq-answer {
      display: none;
      padding: 0 24px 20px;
      font-size: 0.95rem;
      color: var(--text-muted);
      line-height: 1.7;
      border-top: 1px solid #f0f7f2;
      padding-top: 16px;
    }

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

    /* 需求表单 */
    .form-box {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 40px;
      box-shadow: var(--shadow-sm);
    }

    .form-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 20px;
      margin-bottom: 20px;
    }

    .form-group.full {
      grid-column: 1 / -1;
    }

    .form-label {
      display: block;
      font-size: 0.88rem;
      font-weight: 600;
      margin-bottom: 8px;
      color: var(--text-main);
    }

    .form-input,
    .form-select,
    .form-textarea {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid #c9e6d4;
      border-radius: 8px;
      font-size: 0.95rem;
      color: var(--text-main);
      background: #fdfefe;
      outline: none;
      transition: var(--transition);
    }

    .form-input:focus,
    .form-select:focus,
    .form-textarea:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(0, 179, 101, 0.15);
      background: #ffffff;
    }

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

    /* 友情链接与文章 */
    .links-cluster {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 16px;
    }

    .links-cluster a {
      background: #ffffff;
      border: 1px solid #cde9d7;
      padding: 6px 14px;
      border-radius: 6px;
      font-size: 0.85rem;
      color: #3b5244;
    }

    .links-cluster a:hover {
      background: var(--primary);
      color: #ffffff;
      border-color: var(--primary);
    }

    /* 客服与微信互动卡片 */
    .contact-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 24px;
      text-align: center;
    }

    .qr-box {
      margin: 16px auto;
      max-width: 160px;
      padding: 8px;
      background: #f4faf6;
      border-radius: 10px;
      border: 1px solid #d4eddf;
    }

    .qr-box img {
      width: 100%;
      height: auto;
      display: block;
      border-radius: 6px;
    }

    /* 浮动组件 */
    .float-panel {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .float-btn {
      width: 46px;
      height: 46px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 50%;
      box-shadow: var(--shadow-md);
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary-dark);
      cursor: pointer;
      transition: var(--transition);
    }

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

    /* 页脚 */
    .site-footer {
      background: #0f2117;
      color: #bdd6c6;
      padding: 60px 0 30px;
      font-size: 0.9rem;
      border-top: 3px solid var(--primary);
    }

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

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

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

    .footer-links-list a:hover {
      color: #49f39e;
      padding-left: 4px;
    }

    .footer-bottom {
      border-top: 1px solid #233e2f;
      padding-top: 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 16px;
      color: #8fae9b;
      font-size: 0.85rem;
    }

    /* 响应式适配 */
    @media (max-width: 992px) {
      .hero-grid {
        grid-template-columns: 1fr;
      }
      .grid-3,
      .grid-4,
      .steps-row {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 768px) {
      .menu-toggle {
        display: block;
      }
      .nav-links {
        display: none;
        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-lg);
      }
      .nav-links.show {
        display: flex;
      }
      .nav-links a {
        width: 100%;
        padding: 10px 0;
      }
      .hero-title {
        font-size: 1.85rem;
      }
      .grid-3,
      .grid-4,
      .grid-2,
      .steps-row,
      .form-grid {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .eval-top {
        flex-direction: column;
        align-items: flex-start;
      }
    }