/* 基础复位与主题设定：春绿薄荷清新风 */
    :root {
      --primary-color: #10b981;
      --primary-dark: #047857;
      --primary-light: #ecfdf5;
      --mint-accent: #a7f3d0;
      --text-main: #0f172a;
      --text-sub: #475569;
      --bg-main: #f8fafc;
      --bg-card: #ffffff;
      --border-color: #e2e8f0;
      --shadow-sm: 0 2px 8px rgba(16, 185, 129, 0.06);
      --shadow-md: 0 4px 16px rgba(16, 185, 129, 0.1);
      --shadow-lg: 0 10px 25px rgba(15, 23, 42, 0.08);
      --radius: 12px;
      --max-width: 1200px;
    }

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

    body {
      background-color: var(--bg-main);
      color: var(--text-main);
      overflow-x: hidden;
    }

    a {
      color: var(--primary-dark);
      text-decoration: none;
      transition: all 0.2s ease;
    }

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

    /* 容器规范 */
    .container {
      width: 100%;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 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);
      box-shadow: 0 2px 10px rgba(0,0,0,0.03);
    }

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

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

    .ai-page-logo {
      max-height: 42px;
      width: auto;
      display: block;
    }

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

    .nav-links {
      display: flex;
      align-items: center;
      gap: 0; /* 严格按照要求指定为 0 */
      list-style: none;
    }

    .nav-links li a {
      display: block;
      padding: 8px 12px;
      font-size: 0.92rem;
      font-weight: 500;
      color: var(--text-sub);
      border-radius: 6px;
    }

    .nav-links li a:hover,
    .nav-links li a.active {
      color: var(--primary-dark);
      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: 10px 22px;
      font-size: 0.95rem;
      font-weight: 600;
      border-radius: 8px;
      cursor: pointer;
      border: 1px solid transparent;
      transition: all 0.25s ease;
    }

    .btn-primary {
      background-color: var(--primary-color);
      color: #ffffff !important;
      box-shadow: 0 4px 12px rgba(16, 185, 129, 0.3);
    }

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

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

    .btn-outline:hover {
      background: var(--primary-color);
      color: #ffffff !important;
    }

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

    /* 首屏 Hero - 严格无图片 */
    .hero-section {
      background: linear-gradient(135deg, #ecfdf5 0%, #f0fdf4 50%, #ffffff 100%);
      padding: 90px 0 70px;
      text-align: center;
      position: relative;
      overflow: hidden;
      border-bottom: 1px solid var(--border-color);
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 16px;
      background-color: #ffffff;
      border: 1px solid var(--mint-accent);
      border-radius: 50px;
      font-size: 0.88rem;
      color: var(--primary-dark);
      font-weight: 600;
      margin-bottom: 24px;
      box-shadow: var(--shadow-sm);
    }

    .hero-title {
      font-size: 2.2rem;
      font-weight: 800;
      color: var(--text-main);
      line-height: 1.3;
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }

    .hero-subtitle {
      max-width: 780px;
      margin: 0 auto 36px;
      font-size: 1.1rem;
      color: var(--text-sub);
      line-height: 1.7;
    }

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

    .hero-stats {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
      gap: 20px;
      max-width: 900px;
      margin: 0 auto;
      text-align: center;
    }

    .stat-card {
      background: rgba(255, 255, 255, 0.8);
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 20px;
      backdrop-filter: blur(5px);
      box-shadow: var(--shadow-sm);
    }

    .stat-number {
      font-size: 1.8rem;
      font-weight: 800;
      color: var(--primary-dark);
    }

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

    /* 公用 Section 样式 */
    .section-block {
      padding: 80px 0;
      border-bottom: 1px solid #f1f5f9;
    }

    .section-header {
      text-align: center;
      max-width: 700px;
      margin: 0 auto 50px;
    }

    .section-tag {
      font-size: 0.85rem;
      font-weight: 700;
      text-transform: uppercase;
      color: var(--primary-dark);
      letter-spacing: 1px;
      margin-bottom: 8px;
      display: block;
    }

    .section-title {
      font-size: 1.9rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 12px;
    }

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

    /* 通用 Grid 卡片排版 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
      gap: 24px;
    }

    .grid-4 {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
      gap: 20px;
    }

    .feature-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 28px;
      transition: all 0.3s ease;
      box-shadow: var(--shadow-sm);
    }

    .feature-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-md);
      border-color: var(--mint-accent);
    }

    .feature-icon {
      width: 48px;
      height: 48px;
      border-radius: 10px;
      background: var(--primary-light);
      color: var(--primary-dark);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: bold;
      font-size: 1.2rem;
      margin-bottom: 18px;
    }

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

    .feature-card p {
      font-size: 0.95rem;
      color: var(--text-sub);
      line-height: 1.6;
    }

    /* 包含图片、场景展示与最新文章 */
    .media-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }

    .media-card-body {
      padding: 20px;
    }

    .ai-page-image {
      width: 100%;
      height: auto;
      display: block;
      object-fit: cover;
    }

    /* 标签云与模型聚合 */
    .tag-cloud {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      margin-top: 15px;
    }

    .tag-item {
      padding: 6px 14px;
      background: var(--primary-light);
      color: var(--primary-dark);
      border-radius: 20px;
      font-size: 0.88rem;
      font-weight: 500;
      border: 1px solid rgba(16, 185, 129, 0.2);
    }

    /* 对比评测表格 */
    .table-wrapper {
      width: 100%;
      overflow-x: auto;
      background: var(--bg-card);
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

    .compare-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 650px;
    }

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

    .compare-table th {
      background: var(--primary-light);
      color: var(--primary-dark);
      font-weight: 700;
    }

    .compare-table tr:hover {
      background-color: #f8fafc;
    }

    .badge-highlight {
      background: var(--primary-color);
      color: #fff;
      padding: 4px 10px;
      border-radius: 12px;
      font-size: 0.8rem;
      font-weight: 600;
    }

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

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

    .step-number {
      font-size: 2.2rem;
      font-weight: 900;
      color: var(--mint-accent);
      line-height: 1;
      margin-bottom: 12px;
    }

    /* 评论卡片 */
    .testimonial-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 24px;
      box-shadow: var(--shadow-sm);
    }

    .testimonial-user {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-top: 16px;
    }

    .user-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: var(--primary-light);
      color: var(--primary-dark);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
    }

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

    .faq-item {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      overflow: hidden;
    }

    .faq-question {
      width: 100%;
      padding: 18px 24px;
      text-align: left;
      background: none;
      border: none;
      font-size: 1.05rem;
      font-weight: 600;
      color: var(--text-main);
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
    }

    .faq-answer {
      padding: 0 24px 18px;
      color: var(--text-sub);
      font-size: 0.95rem;
      display: none;
      line-height: 1.7;
    }

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

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

    .faq-toggle {
      transition: transform 0.3s ease;
      font-weight: bold;
    }

    /* 表单与联系 */
    .contact-wrapper {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 40px;
      box-shadow: var(--shadow-md);
    }

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

    .form-group label {
      display: block;
      margin-bottom: 8px;
      font-weight: 600;
      font-size: 0.9rem;
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      font-size: 0.95rem;
      background: #f8fafc;
      transition: border 0.2s;
    }

    .form-control:focus {
      outline: none;
      border-color: var(--primary-color);
      background: #fff;
    }

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

    /* 页脚 */
    .site-footer {
      background: #0f172a;
      color: #94a3b8;
      padding: 60px 0 30px;
      font-size: 0.9rem;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
      gap: 30px;
      margin-bottom: 40px;
    }

    .footer-col h4 {
      color: #ffffff;
      font-size: 1.05rem;
      margin-bottom: 16px;
    }

    .footer-col ul {
      list-style: none;
    }

    .footer-col ul li {
      margin-bottom: 8px;
    }

    .footer-col a {
      color: #94a3b8;
    }

    .footer-col a:hover {
      color: var(--mint-accent);
    }

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

    .friend-links a {
      color: #cbd5e1;
      background: rgba(255,255,255,0.05);
      padding: 4px 10px;
      border-radius: 4px;
      font-size: 0.85rem;
    }

    .footer-bottom {
      text-align: center;
      padding-top: 30px;
      border-top: 1px solid #1e293b;
      color: #64748b;
    }

    /* 悬浮客服 */
    .floating-widget {
      position: fixed;
      right: 20px;
      bottom: 20px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .float-btn {
      width: 52px;
      height: 52px;
      border-radius: 50%;
      background: var(--primary-color);
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 4px 14px rgba(0,0,0,0.15);
      cursor: pointer;
      font-weight: bold;
      border: none;
      position: relative;
    }

    .qr-popup {
      position: absolute;
      right: 64px;
      bottom: 0;
      background: #fff;
      padding: 12px;
      border-radius: 8px;
      box-shadow: var(--shadow-lg);
      display: none;
      text-align: center;
      width: 160px;
      border: 1px solid var(--border-color);
    }

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

    .qr-popup p {
      font-size: 0.8rem;
      color: var(--text-main);
      margin-top: 6px;
    }

    .float-btn:hover .qr-popup {
      display: block;
    }

    /* 响应式调整 */
    @media (max-width: 992px) {
      .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-md);
      }

      .nav-links.show {
        display: flex;
      }

      .mobile-toggle {
        display: block;
      }

      .contact-wrapper {
        grid-template-columns: 1fr;
      }
    }

    @media (max-width: 640px) {
      .hero-title {
        font-size: 1.6rem;
      }
      .section-title {
        font-size: 1.4rem;
      }
      .hero-ctas {
        flex-direction: column;
        width: 100%;
      }
      .hero-ctas .btn {
        width: 100%;
      }
    }