:root {
      --primary: #059669;
      --primary-hover: #047857;
      --accent: #10b981;
      --accent-light: #ecfdf5;
      --accent-glow: rgba(16, 185, 129, 0.15);
      --dark: #0f172a;
      --text: #334155;
      --muted: #64748b;
      --bg-light: #f8fafc;
      --card-bg: #ffffff;
      --border: #e2e8f0;
      --border-accent: #a7f3d0;
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.05);
      --shadow-md: 0 4px 12px rgba(16, 185, 129, 0.08);
      --shadow-lg: 0 12px 28px rgba(0,0,0,0.06);
      --radius: 12px;
      --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-light);
      color: var(--text);
      line-height: 1.65;
      overflow-x: hidden;
      background-image: radial-gradient(#d1fae5 0.8px, transparent 0.8px);
      background-size: 24px 24px;
    }

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

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
      width: 100%;
    }

    /* 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);
      box-shadow: var(--shadow-sm);
    }
    .nav-wrapper {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .logo-box {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .logo-box img.ai-page-logo {
      height: 38px;
      width: auto;
      display: block;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
      list-style: none;
    }
    .nav-links li a {
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--dark);
      padding: 8px 14px;
      border-radius: 6px;
      display: inline-block;
    }
    .nav-links li a:hover {
      color: var(--primary);
      background: var(--accent-light);
    }
    .nav-actions {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .btn-nav-primary {
      background: var(--primary);
      color: #ffffff !important;
      padding: 8px 18px;
      border-radius: 8px;
      font-weight: 600;
      font-size: 0.92rem;
      box-shadow: 0 2px 8px rgba(5, 150, 105, 0.25);
    }
    .btn-nav-primary:hover {
      background: var(--primary-hover);
      transform: translateY(-1px);
    }

    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      color: var(--dark);
      cursor: pointer;
    }

    /* 标题与版块共用 */
    section {
      padding: 72px 0;
      position: relative;
    }
    .section-header {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 48px auto;
    }
    .section-badge {
      display: inline-block;
      background: var(--accent-light);
      color: var(--primary);
      border: 1px solid var(--border-accent);
      padding: 4px 14px;
      border-radius: 20px;
      font-size: 0.82rem;
      font-weight: 600;
      margin-bottom: 12px;
      letter-spacing: 0.5px;
    }
    .section-title {
      font-size: 2rem;
      color: var(--dark);
      font-weight: 700;
      line-height: 1.35;
      margin-bottom: 12px;
    }
    .section-desc {
      font-size: 1.02rem;
      color: var(--muted);
      line-height: 1.6;
    }

    /* 首屏 Hero */
    .hero-section {
      padding: 70px 0 60px 0;
      background: linear-gradient(180deg, #ecfdf5 0%, #f8fafc 100%);
      border-bottom: 1px solid var(--border);
      text-align: center;
    }
    .hero-container {
      max-width: 960px;
      margin: 0 auto;
    }
    .hero-pill {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: #ffffff;
      border: 1px solid var(--border-accent);
      padding: 6px 18px;
      border-radius: 30px;
      font-size: 0.88rem;
      color: var(--primary);
      font-weight: 600;
      box-shadow: var(--shadow-sm);
      margin-bottom: 20px;
    }
    .hero-title {
      font-size: 2.75rem;
      color: var(--dark);
      font-weight: 800;
      line-height: 1.25;
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }
    .hero-subtitle {
      font-size: 1.15rem;
      color: var(--muted);
      line-height: 1.7;
      margin-bottom: 32px;
      max-width: 820px;
      margin-left: auto;
      margin-right: auto;
    }
    .hero-cta-group {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 48px;
    }
    .btn-main-green {
      background: linear-gradient(135deg, #10b981 0%, #059669 100%);
      color: #ffffff;
      padding: 14px 34px;
      border-radius: 10px;
      font-size: 1.05rem;
      font-weight: 600;
      box-shadow: 0 4px 14px rgba(16, 185, 129, 0.35);
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }
    .btn-main-green:hover {
      background: linear-gradient(135deg, #059669 0%, #047857 100%);
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(16, 185, 129, 0.45);
      color: #ffffff;
    }
    .btn-main-outline {
      background: #ffffff;
      color: var(--dark);
      border: 1px solid var(--border);
      padding: 14px 28px;
      border-radius: 10px;
      font-size: 1.02rem;
      font-weight: 600;
    }
    .btn-main-outline:hover {
      border-color: var(--primary);
      color: var(--primary);
      background: var(--accent-light);
    }
    .hero-metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
      background: #ffffff;
      padding: 24px;
      border-radius: 16px;
      border: 1px solid var(--border);
      box-shadow: var(--shadow-md);
    }
    .metric-item {
      padding: 12px;
      border-right: 1px solid var(--border);
    }
    .metric-item:last-child {
      border-right: none;
    }
    .metric-num {
      font-size: 1.9rem;
      font-weight: 800;
      color: var(--primary);
      line-height: 1.2;
    }
    .metric-label {
      font-size: 0.88rem;
      color: var(--muted);
      margin-top: 4px;
    }

    /* 平台矩阵标签 */
    .model-tags-wrapper {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 8px;
      margin-top: 28px;
    }
    .model-tag {
      background: #ffffff;
      border: 1px solid #d1fae5;
      color: #065f46;
      font-size: 0.82rem;
      font-weight: 600;
      padding: 5px 12px;
      border-radius: 6px;
      box-shadow: 0 1px 2px rgba(0,0,0,0.03);
    }

    /* 通用卡片与网格 */
    .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: 28px;
    }

    .card {
      background: var(--card-bg);
      border: 1px solid var(--border);
      border-radius: var(--radius);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }
    .card:hover {
      border-color: var(--border-accent);
      box-shadow: var(--shadow-md);
      transform: translateY(-3px);
    }
    .card-icon {
      width: 44px;
      height: 44px;
      background: var(--accent-light);
      color: var(--primary);
      border-radius: 10px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.3rem;
      font-weight: bold;
      margin-bottom: 16px;
    }
    .card-title {
      font-size: 1.15rem;
      color: var(--dark);
      font-weight: 700;
      margin-bottom: 10px;
    }
    .card-text {
      font-size: 0.92rem;
      color: var(--muted);
      line-height: 1.6;
    }

    /* 评测卡片与表格 */
    .review-highlight-box {
      background: linear-gradient(135deg, #065f46 0%, #047857 100%);
      color: #ffffff;
      padding: 32px;
      border-radius: 16px;
      margin-bottom: 36px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      box-shadow: var(--shadow-lg);
    }
    .rating-score-block {
      display: flex;
      align-items: baseline;
      gap: 8px;
    }
    .score-num {
      font-size: 3.5rem;
      font-weight: 900;
      line-height: 1;
      color: #6ee7b7;
    }
    .score-total {
      font-size: 1.2rem;
      opacity: 0.85;
    }
    .rating-stars {
      color: #facc15;
      font-size: 1.4rem;
      margin-bottom: 6px;
    }

    .table-container {
      background: #ffffff;
      border: 1px solid var(--border);
      border-radius: var(--radius);
      overflow-x: auto;
      box-shadow: var(--shadow-sm);
    }
    table.custom-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
    }
    table.custom-table th, table.custom-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border);
      font-size: 0.94rem;
    }
    table.custom-table th {
      background: #f1f5f9;
      color: var(--dark);
      font-weight: 700;
    }
    table.custom-table tr:hover {
      background: #f8fafc;
    }
    .td-highlight {
      color: var(--primary);
      font-weight: 700;
    }

    /* 流程步骤 */
    .flow-steps {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      position: relative;
    }
    .step-box {
      background: #ffffff;
      border: 1px solid var(--border);
      border-radius: var(--radius);
      padding: 24px;
      text-align: center;
      position: relative;
    }
    .step-num {
      width: 36px;
      height: 36px;
      background: var(--primary);
      color: #ffffff;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 14px auto;
      font-weight: 700;
    }

    /* 素材图片容器规范 */
    .media-card {
      background: #ffffff;
      border: 1px solid var(--border);
      border-radius: var(--radius);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }
    .media-img-wrap {
      width: 100%;
      overflow: hidden;
      background: #e2e8f0;
    }
    .media-img-wrap img {
      width: 100%;
      height: auto;
      max-width: 100%;
      display: block;
      transition: var(--transition);
    }
    .media-card:hover .media-img-wrap img {
      transform: scale(1.03);
    }
    .media-content {
      padding: 20px;
    }

    /* 用户评论 */
    .testimonial-card {
      background: #ffffff;
      border: 1px solid var(--border);
      border-radius: var(--radius);
      padding: 22px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .testi-user {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-top: 16px;
      border-top: 1px solid #f1f5f9;
      padding-top: 12px;
    }
    .testi-avatar {
      width: 40px;
      height: 40px;
      background: #10b981;
      color: #ffffff;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 0.95rem;
    }
    .testi-name {
      font-weight: 700;
      font-size: 0.92rem;
      color: var(--dark);
    }
    .testi-role {
      font-size: 0.8rem;
      color: var(--muted);
    }

    /* FAQ 折叠面板 */
    .faq-list {
      max-width: 860px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }
    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border);
      border-radius: 10px;
      overflow: hidden;
    }
    .faq-question {
      padding: 18px 24px;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 600;
      color: var(--dark);
      background: #ffffff;
      transition: var(--transition);
    }
    .faq-question:hover {
      background: var(--accent-light);
      color: var(--primary);
    }
    .faq-icon {
      font-size: 1.2rem;
      color: var(--muted);
      transition: transform 0.25s ease;
    }
    .faq-answer {
      padding: 0 24px;
      max-height: 0;
      overflow: hidden;
      transition: all 0.28s ease;
      color: var(--muted);
      font-size: 0.94rem;
      line-height: 1.6;
      background: #fafafa;
    }
    .faq-item.active .faq-answer {
      padding: 16px 24px 20px 24px;
      max-height: 200px;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
      color: var(--primary);
    }

    /* 表单区域 */
    .form-wrapper {
      background: #ffffff;
      border: 1px solid var(--border);
      border-radius: 16px;
      padding: 36px;
      box-shadow: var(--shadow-md);
      max-width: 720px;
      margin: 0 auto;
    }
    .form-group {
      margin-bottom: 18px;
    }
    .form-group label {
      display: block;
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--dark);
      margin-bottom: 6px;
    }
    .form-control {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid var(--border);
      border-radius: 8px;
      font-size: 0.95rem;
      color: var(--dark);
      background: #f8fafc;
      outline: none;
      transition: var(--transition);
    }
    .form-control:focus {
      border-color: var(--primary);
      background: #ffffff;
      box-shadow: 0 0 0 3px var(--accent-glow);
    }
    textarea.form-control {
      resize: vertical;
      min-height: 90px;
    }
    .btn-submit {
      width: 100%;
      background: var(--primary);
      color: #ffffff;
      border: none;
      padding: 14px;
      border-radius: 8px;
      font-size: 1.05rem;
      font-weight: 700;
      cursor: pointer;
      transition: var(--transition);
    }
    .btn-submit:hover {
      background: var(--primary-hover);
    }

    /* 文章列表 */
    .article-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }
    .article-item {
      background: #ffffff;
      border: 1px solid var(--border);
      border-radius: var(--radius);
      padding: 20px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .article-link {
      font-weight: 600;
      color: var(--dark);
      margin-bottom: 8px;
      display: block;
    }
    .article-link:hover {
      color: var(--primary);
    }
    .article-date {
      font-size: 0.8rem;
      color: var(--muted);
    }

    /* 底部通用规范 */
    .site-footer {
      background: #0f172a;
      color: #cbd5e1;
      padding: 60px 0 30px 0;
      border-top: 3px solid var(--primary);
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.2fr;
      gap: 36px;
      margin-bottom: 40px;
    }
    .footer-title {
      font-size: 1.05rem;
      font-weight: 700;
      color: #ffffff;
      margin-bottom: 16px;
    }
    .footer-links {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .footer-links a {
      color: #94a3b8;
      font-size: 0.9rem;
    }
    .footer-links a:hover {
      color: #34d399;
    }
    .footer-contact-item {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 0.9rem;
      margin-bottom: 8px;
      color: #94a3b8;
    }
    .qr-container {
      text-align: center;
    }
    .qr-container img {
      width: 110px;
      height: 110px;
      border-radius: 8px;
      border: 2px solid #334155;
      background: #ffffff;
      padding: 4px;
    }
    .friend-links-box {
      border-top: 1px solid #1e293b;
      padding-top: 24px;
      margin-bottom: 24px;
    }
    .friend-links-title {
      font-size: 0.88rem;
      color: #64748b;
      margin-bottom: 10px;
    }
    .friend-links-list {
      display: flex;
      flex-wrap: wrap;
      gap: 14px;
    }
    .friend-links-list a {
      color: #94a3b8;
      font-size: 0.85rem;
    }
    .friend-links-list a:hover {
      color: #10b981;
    }
    .footer-bottom {
      border-top: 1px solid #1e293b;
      padding-top: 20px;
      text-align: center;
      font-size: 0.85rem;
      color: #64748b;
    }

    /* 悬浮客服 */
    .float-service {
      position: fixed;
      right: 20px;
      bottom: 40px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .float-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: var(--primary);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 4px 14px rgba(0,0,0,0.2);
      cursor: pointer;
      font-size: 1.2rem;
      transition: var(--transition);
      border: none;
    }
    .float-btn:hover {
      background: var(--primary-hover);
      transform: scale(1.08);
    }

    /* 响应式调整 */
    @media (max-width: 992px) {
      .grid-4, .flow-steps {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
      .hero-metrics-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
      .review-highlight-box {
        flex-direction: column;
        text-align: center;
        gap: 20px;
      }
      .hero-title {
        font-size: 2.2rem;
      }
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
      }
      .mobile-menu-btn {
        display: block;
      }
      .grid-3, .grid-4, .grid-2, .article-grid, .hero-metrics-grid, .flow-steps {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .hero-title {
        font-size: 1.85rem;
      }
      .section-title {
        font-size: 1.6rem;
      }
    }