:root {
      --primary: #4f46e5;
      --primary-hover: #4338ca;
      --accent-coral: #ff5e36;
      --accent-cyan: #06b6d4;
      --accent-amber: #f59e0b;
      --accent-emerald: #10b981;
      --bg-main: #f8fafc;
      --bg-card: #ffffff;
      --text-main: #0f172a;
      --text-muted: #475569;
      --border-color: #e2e8f0;
      --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
      --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
      --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.06);
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --transition-fast: 0.2s ease;
      --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }

    * {
      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-main);
      color: var(--text-main);
      line-height: 1.6;
      overflow-x: hidden;
      -webkit-font-smoothing: antialiased;
    }

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

    .container {
      max-width: 1240px;
      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, 0.94);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
      transition: all var(--transition-fast);
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 76px;
    }

    .logo-box {
      display: flex;
      align-items: center;
      gap: 12px;
      font-weight: 800;
      font-size: 1.35rem;
      color: var(--primary);
    }

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

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

    .nav-links a {
      font-size: 0.92rem;
      font-weight: 500;
      color: var(--text-muted);
      padding: 8px 12px;
      border-radius: var(--radius-sm);
    }

    .nav-links a:hover {
      color: var(--primary);
      background: rgba(79, 70, 229, 0.06);
    }

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

    .btn-header-ghost {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 8px 18px;
      font-size: 0.92rem;
      font-weight: 600;
      border-radius: 999px;
      color: var(--primary);
      border: 1.5px solid var(--primary);
      background: transparent;
    }

    .btn-header-ghost:hover {
      background: var(--primary);
      color: #fff;
    }

    .btn-primary-action {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      font-size: 0.95rem;
      font-weight: 700;
      border-radius: 999px;
      background: linear-gradient(135deg, var(--accent-coral), #f43f5e);
      color: #fff;
      box-shadow: 0 4px 14px rgba(255, 94, 54, 0.35);
      border: none;
      cursor: pointer;
      transition: transform var(--transition-fast), box-shadow var(--transition-fast);
    }

    .btn-primary-action:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(255, 94, 54, 0.45);
      color: #fff;
    }

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

    /* 醒目首屏 Hero - 严格无图片 */
    .hero-section {
      position: relative;
      background: radial-gradient(circle at 85% 15%, rgba(6, 182, 212, 0.12) 0%, transparent 40%),
                  radial-gradient(circle at 10% 80%, rgba(255, 94, 54, 0.1) 0%, transparent 45%),
                  linear-gradient(180deg, #ffffff 0%, #f1f5f9 100%);
      padding: 80px 0 90px;
      border-bottom: 1px solid var(--border-color);
      overflow: hidden;
    }

    .hero-wrapper {
      display: flex;
      flex-direction: column;
      align-items: center;
      text-align: center;
      max-width: 960px;
      margin: 0 auto;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 18px;
      border-radius: 999px;
      background: #e0e7ff;
      color: var(--primary);
      font-size: 0.88rem;
      font-weight: 700;
      margin-bottom: 24px;
      letter-spacing: 0.5px;
    }

    .hero-title {
      font-size: 3rem;
      line-height: 1.25;
      font-weight: 900;
      color: var(--text-main);
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }

    .hero-title span {
      background: linear-gradient(135deg, var(--primary) 0%, var(--accent-coral) 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-desc {
      font-size: 1.2rem;
      color: var(--text-muted);
      margin-bottom: 36px;
      max-width: 780px;
      line-height: 1.7;
    }

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

    .btn-hero-official {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 16px 36px;
      font-size: 1.15rem;
      font-weight: 800;
      color: #ffffff;
      background: linear-gradient(135deg, #2563eb, #4f46e5);
      border-radius: 999px;
      box-shadow: 0 10px 25px -5px rgba(37, 99, 235, 0.4);
      transition: all var(--transition-fast);
    }

    .btn-hero-official:hover {
      transform: translateY(-2px);
      box-shadow: 0 14px 30px -5px rgba(37, 99, 235, 0.5);
      color: #fff;
    }

    .btn-hero-agent {
      display: inline-flex;
      align-items: center;
      padding: 16px 32px;
      font-size: 1.1rem;
      font-weight: 700;
      color: var(--text-main);
      background: #ffffff;
      border: 2px solid var(--border-color);
      border-radius: 999px;
      transition: all var(--transition-fast);
    }

    .btn-hero-agent:hover {
      border-color: var(--accent-coral);
      color: var(--accent-coral);
      transform: translateY(-2px);
    }

    /* 纯色几何数据面板 (替代图片) */
    .hero-stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      width: 100%;
    }

    .stat-card-pure {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px 16px;
      box-shadow: var(--shadow-sm);
      text-align: center;
      border-top: 4px solid var(--primary);
      transition: transform var(--transition-fast);
    }

    .stat-card-pure:nth-child(2) { border-top-color: var(--accent-coral); }
    .stat-card-pure:nth-child(3) { border-top-color: var(--accent-cyan); }
    .stat-card-pure:nth-child(4) { border-top-color: var(--accent-emerald); }

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

    .stat-card-num {
      font-size: 2.2rem;
      font-weight: 900;
      color: var(--text-main);
      margin-bottom: 4px;
    }

    .stat-card-label {
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--text-muted);
    }

    /* 通用Section */
    .section {
      padding: 80px 0;
      border-bottom: 1px solid var(--border-color);
    }

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

    .section-head {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 50px;
    }

    .section-tag {
      display: inline-block;
      font-size: 0.85rem;
      font-weight: 800;
      color: var(--primary);
      background: rgba(79, 70, 229, 0.1);
      padding: 4px 14px;
      border-radius: 999px;
      margin-bottom: 12px;
      text-transform: uppercase;
      letter-spacing: 1px;
    }

    .section-title {
      font-size: 2.2rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 16px;
    }

    .section-sub {
      font-size: 1.05rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 平台介绍 */
    .intro-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
    }

    .intro-content p {
      font-size: 1.05rem;
      color: var(--text-muted);
      margin-bottom: 20px;
      line-height: 1.8;
    }

    .intro-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      margin-top: 24px;
    }

    .tag-item {
      background: #e2e8f0;
      padding: 6px 14px;
      border-radius: var(--radius-sm);
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--text-main);
    }

    .intro-highlight-box {
      background: linear-gradient(145deg, #1e1b4b, #312e81);
      color: #ffffff;
      padding: 36px;
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-xl);
    }

    .intro-highlight-box h3 {
      font-size: 1.6rem;
      color: #38bdf8;
      margin-bottom: 16px;
    }

    .intro-highlight-box ul {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }

    .intro-highlight-box li {
      display: flex;
      align-items: flex-start;
      gap: 10px;
      font-size: 0.98rem;
      color: #e2e8f0;
    }

    .intro-highlight-box li::before {
      content: "✓";
      color: var(--accent-coral);
      font-weight: 900;
    }

    /* 支持模型标签墙 */
    .models-marquee {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-top: 30px;
    }

    .model-chip {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 999px;
      padding: 8px 18px;
      font-size: 0.92rem;
      font-weight: 600;
      color: var(--text-main);
      box-shadow: var(--shadow-sm);
      transition: all var(--transition-fast);
    }

    .model-chip:hover {
      border-color: var(--primary);
      color: var(--primary);
      transform: translateY(-2px);
    }

    /* 服务矩阵卡片 - 撞色艳色风 */
    .service-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .service-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 30px 24px;
      transition: all var(--transition-normal);
      display: flex;
      flex-direction: column;
      position: relative;
      overflow: hidden;
    }

    .service-card::before {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      height: 5px;
      background: var(--primary);
    }

    .service-card:nth-child(2n)::before { background: var(--accent-coral); }
    .service-card:nth-child(3n)::before { background: var(--accent-cyan); }
    .service-card:nth-child(4n)::before { background: var(--accent-amber); }
    .service-card:nth-child(5n)::before { background: var(--accent-emerald); }

    .service-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-xl);
      border-color: transparent;
    }

    .service-icon-wrap {
      width: 52px;
      height: 52px;
      border-radius: var(--radius-md);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.5rem;
      margin-bottom: 20px;
      background: rgba(79, 70, 229, 0.1);
      color: var(--primary);
    }

    .service-card:nth-child(2n) .service-icon-wrap { background: rgba(255, 94, 54, 0.1); color: var(--accent-coral); }
    .service-card:nth-child(3n) .service-icon-wrap { background: rgba(6, 182, 212, 0.1); color: var(--accent-cyan); }
    .service-card:nth-child(4n) .service-icon-wrap { background: rgba(245, 158, 11, 0.1); color: var(--accent-amber); }

    .service-title {
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 12px;
    }

    .service-desc {
      font-size: 0.95rem;
      color: var(--text-muted);
      line-height: 1.6;
      flex-grow: 1;
    }

    /* 对比评测版块 */
    .compare-section-box {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 36px;
      box-shadow: var(--shadow-md);
    }

    .rating-banner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      background: linear-gradient(135deg, #1e293b, #0f172a);
      color: #fff;
      padding: 24px 32px;
      border-radius: var(--radius-md);
      margin-bottom: 30px;
    }

    .rating-left h3 {
      font-size: 1.4rem;
      margin-bottom: 6px;
    }

    .rating-left p {
      color: #94a3b8;
      font-size: 0.95rem;
    }

    .rating-right {
      display: flex;
      align-items: baseline;
      gap: 8px;
    }

    .rating-score {
      font-size: 3rem;
      font-weight: 900;
      color: var(--accent-amber);
    }

    .rating-max {
      font-size: 1.2rem;
      color: #cbd5e1;
    }

    .rating-stars {
      color: var(--accent-amber);
      font-size: 1.4rem;
      margin-left: 8px;
    }

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

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

    .compare-table th, .compare-table td {
      padding: 18px 20px;
      border-bottom: 1px solid var(--border-color);
      font-size: 0.95rem;
    }

    .compare-table th {
      background: #f8fafc;
      font-weight: 700;
      color: var(--text-main);
    }

    .compare-table td.highlight {
      background: rgba(79, 70, 229, 0.04);
      font-weight: 700;
      color: var(--primary);
    }

    /* 案例展示区 */
    .case-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .case-card {
      background: #ffffff;
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: all var(--transition-fast);
      display: flex;
      flex-direction: column;
    }

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

    .case-img-wrap {
      width: 100%;
      aspect-ratio: 16 / 9;
      overflow: hidden;
      background: #e2e8f0;
    }

    .case-img-wrap.square {
      aspect-ratio: 1 / 1;
    }

    .case-img-wrap img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      display: block;
      transition: transform var(--transition-normal);
    }

    .case-card:hover .case-img-wrap img {
      transform: scale(1.05);
    }

    .case-body {
      padding: 20px;
    }

    .case-title {
      font-size: 1.15rem;
      font-weight: 700;
      margin-bottom: 8px;
    }

    .case-desc {
      font-size: 0.9rem;
      color: var(--text-muted);
    }

    /* 流程步骤 */
    .process-steps-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }

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

    .step-number {
      font-size: 2.2rem;
      font-weight: 900;
      color: rgba(79, 70, 229, 0.2);
      line-height: 1;
      margin-bottom: 12px;
    }

    .step-title {
      font-size: 1.15rem;
      font-weight: 700;
      margin-bottom: 8px;
    }

    .step-desc {
      font-size: 0.9rem;
      color: var(--text-muted);
    }

    /* 用户评论 */
    .reviews-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .review-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;
    }

    .review-text {
      font-size: 0.95rem;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 20px;
      font-style: italic;
    }

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

    .reviewer-avatar-badge {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--primary), var(--accent-coral));
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1.1rem;
    }

    .reviewer-meta h4 {
      font-size: 0.98rem;
      font-weight: 700;
    }

    .reviewer-meta p {
      font-size: 0.82rem;
      color: var(--text-muted);
    }

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

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

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

    .faq-question {
      padding: 18px 24px;
      font-size: 1.05rem;
      font-weight: 700;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      user-select: none;
      background: #ffffff;
    }

    .faq-question::after {
      content: "+";
      font-size: 1.4rem;
      font-weight: 400;
      color: var(--primary);
      transition: transform var(--transition-fast);
    }

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

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      background: #f8fafc;
      padding: 0 24px;
      color: var(--text-muted);
      font-size: 0.95rem;
      line-height: 1.7;
    }

    .faq-item.active .faq-answer {
      max-height: 300px;
      padding: 16px 24px 20px;
      border-top: 1px solid var(--border-color);
    }

    /* 表单与联系 */
    .contact-wrapper {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: stretch;
    }

    .contact-info-panel {
      background: linear-gradient(135deg, #1e293b, #0f172a);
      color: #fff;
      padding: 40px;
      border-radius: var(--radius-lg);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .contact-info-panel h3 {
      font-size: 1.8rem;
      margin-bottom: 16px;
      color: #38bdf8;
    }

    .contact-details {
      display: flex;
      flex-direction: column;
      gap: 16px;
      margin: 24px 0;
    }

    .contact-detail-item {
      display: flex;
      align-items: center;
      gap: 12px;
      font-size: 1rem;
      color: #e2e8f0;
    }

    .qr-group {
      display: flex;
      gap: 24px;
      align-items: center;
      margin-top: 20px;
      padding-top: 20px;
      border-top: 1px solid rgba(255, 255, 255, 0.1);
    }

    .qr-box {
      text-align: center;
    }

    .qr-box img {
      width: 110px;
      height: 110px;
      border-radius: var(--radius-sm);
      background: #fff;
      padding: 4px;
      display: block;
      margin-bottom: 6px;
    }

    .qr-box span {
      font-size: 0.82rem;
      color: #94a3b8;
    }

    .contact-form-panel {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 40px;
      box-shadow: var(--shadow-md);
    }

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

    .form-label {
      display: block;
      font-size: 0.92rem;
      font-weight: 700;
      margin-bottom: 8px;
      color: var(--text-main);
    }

    .form-input, .form-select, .form-textarea {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      font-size: 0.95rem;
      background: #f8fafc;
      color: var(--text-main);
      outline: none;
      transition: border-color var(--transition-fast);
    }

    .form-input:focus, .form-select:focus, .form-textarea:focus {
      border-color: var(--primary);
      background: #ffffff;
    }

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

    .form-submit-btn {
      width: 100%;
      padding: 14px;
      background: linear-gradient(135deg, var(--primary), #6366f1);
      color: #ffffff;
      border: none;
      border-radius: var(--radius-sm);
      font-size: 1.05rem;
      font-weight: 700;
      cursor: pointer;
      box-shadow: var(--shadow-md);
      transition: all var(--transition-fast);
    }

    .form-submit-btn:hover {
      opacity: 0.95;
      transform: translateY(-2px);
    }

    /* 资讯列表 */
    .articles-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 20px;
    }

    .article-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 20px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      transition: border-color var(--transition-fast);
    }

    .article-item:hover {
      border-color: var(--primary);
    }

    .article-title {
      font-size: 1.05rem;
      font-weight: 700;
      margin-bottom: 10px;
      color: var(--text-main);
    }

    .article-link {
      color: var(--primary);
      font-size: 0.88rem;
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }

    /* 页脚规范与友情链接 */
    .site-footer {
      background-color: #0f172a;
      color: #94a3b8;
      padding: 60px 0 30px;
      border-top: 1px solid #1e293b;
    }

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

    .footer-brand h4 {
      color: #ffffff;
      font-size: 1.4rem;
      font-weight: 800;
      margin-bottom: 14px;
    }

    .footer-brand p {
      font-size: 0.9rem;
      line-height: 1.7;
      margin-bottom: 16px;
    }

    .footer-nav-col h5 {
      color: #ffffff;
      font-size: 1rem;
      font-weight: 700;
      margin-bottom: 16px;
    }

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

    .footer-links-list a {
      color: #94a3b8;
      font-size: 0.9rem;
    }

    .footer-links-list a:hover {
      color: #38bdf8;
    }

    .footer-bottom {
      border-top: 1px solid #1e293b;
      padding-top: 24px;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 16px;
      text-align: center;
    }

    .friendly-links-wrap {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 16px;
      font-size: 0.88rem;
    }

    .friendly-links-wrap a {
      color: #64748b;
    }

    .friendly-links-wrap a:hover {
      color: #94a3b8;
    }

    .copyright {
      font-size: 0.85rem;
      color: #64748b;
    }

    /* 浮动客服 */
    .floating-widget {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .float-btn {
      width: 50px;
      height: 50px;
      border-radius: 50%;
      background: var(--primary);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: var(--shadow-xl);
      cursor: pointer;
      border: none;
      font-size: 1.2rem;
      transition: transform var(--transition-fast);
    }

    .float-btn:hover {
      transform: scale(1.1);
    }

    .float-btn.scroll-top {
      background: #1e293b;
      display: none;
    }

    /* 响应式媒体查询 */
    @media (max-width: 1024px) {
      .hero-title { font-size: 2.4rem; }
      .service-grid, .case-grid, .reviews-grid { grid-template-columns: repeat(2, 1fr); }
      .hero-stats-grid { grid-template-columns: repeat(2, 1fr); }
      .process-steps-grid { grid-template-columns: repeat(2, 1fr); }
      .footer-top-grid { grid-template-columns: 1fr 1fr; }
    }

    @media (max-width: 768px) {
      .menu-toggle { display: block; }
      .nav-links {
        position: absolute;
        top: 76px;
        left: 0;
        right: 0;
        background: #ffffff;
        flex-direction: column;
        align-items: flex-start;
        padding: 20px;
        border-bottom: 1px solid var(--border-color);
        display: none;
        box-shadow: var(--shadow-md);
      }
      .nav-links.active { display: flex; }
      .nav-links a { width: 100%; padding: 10px 0; }
      .hero-title { font-size: 1.85rem; }
      .hero-desc { font-size: 1rem; }
      .intro-grid, .contact-wrapper, .articles-grid { grid-template-columns: 1fr; }
      .service-grid, .case-grid, .reviews-grid, .process-steps-grid { grid-template-columns: 1fr; }
      .hero-stats-grid { grid-template-columns: 1fr 1fr; }
      .footer-top-grid { grid-template-columns: 1fr; }
      .rating-banner { flex-direction: column; text-align: center; gap: 16px; }
      .rating-right { justify-content: center; }
    }