:root {
      --primary: #ff3b30;
      --primary-hover: #e02d24;
      --accent-blue: #0055ff;
      --accent-yellow: #ffcc00;
      --accent-teal: #00c49f;
      --bg-main: #fbfbfd;
      --bg-card: #ffffff;
      --bg-secondary: #f4f5f8;
      --text-main: #14171a;
      --text-muted: #5c6470;
      --border-color: #e5e8ee;
      --border-contrast: #14171a;
      --shadow-sm: 0 2px 8px rgba(20, 23, 26, 0.05);
      --shadow-md: 0 8px 24px rgba(20, 23, 26, 0.08);
      --shadow-hard: 4px 4px 0px #14171a;
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    html {
      scroll-behavior: smooth;
    }
    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;
      -webkit-font-smoothing: antialiased;
    }
    a {
      color: inherit;
      text-decoration: none;
      transition: all 0.2s ease;
    }
    .container {
      width: 100%;
      max-width: 1200px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 20px;
      padding-right: 20px;
    }

    /* 顶部导航 */
    header.site-header {
      position: sticky;
      top: 0;
      z-index: 999;
      background-color: rgba(255, 255, 255, 0.96);
      border-bottom: 2px solid var(--border-contrast);
      backdrop-filter: blur(8px);
    }
    .nav-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .brand-wrap {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .brand-wrap .ai-page-logo {
      height: 40px;
      width: auto;
      display: block;
    }
    .brand-title {
      font-size: 1.25rem;
      font-weight: 800;
      color: var(--text-main);
      letter-spacing: -0.5px;
    }
    .brand-title span {
      color: var(--primary);
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
      list-style: none;
    }
    .nav-links li a {
      display: inline-block;
      padding: 8px 14px;
      font-size: 0.95rem;
      font-weight: 600;
      color: var(--text-main);
      border-radius: var(--radius-sm);
    }
    .nav-links li a:hover {
      color: var(--accent-blue);
      background-color: var(--bg-secondary);
    }
    .nav-actions {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .btn-nav-portal {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 9px 18px;
      font-size: 0.9rem;
      font-weight: 700;
      background: var(--accent-yellow);
      color: var(--text-main);
      border: 2px solid var(--border-contrast);
      box-shadow: 2px 2px 0px var(--border-contrast);
      border-radius: var(--radius-sm);
    }
    .btn-nav-portal:hover {
      transform: translate(-1px, -1px);
      box-shadow: 3px 3px 0px var(--border-contrast);
      background: #ffd633;
    }
    .mobile-menu-toggle {
      display: none;
      background: none;
      border: 2px solid var(--border-contrast);
      padding: 6px 10px;
      font-weight: 700;
      border-radius: var(--radius-sm);
      cursor: pointer;
    }

    /* 醒目版块通用标题 */
    .section-header {
      text-align: center;
      margin-bottom: 48px;
    }
    .badge-tag {
      display: inline-block;
      padding: 4px 14px;
      font-size: 0.85rem;
      font-weight: 800;
      text-transform: uppercase;
      letter-spacing: 0.5px;
      border: 2px solid var(--border-contrast);
      border-radius: 999px;
      margin-bottom: 12px;
      background-color: var(--accent-yellow);
      color: var(--text-main);
      box-shadow: 2px 2px 0px var(--border-contrast);
    }
    .badge-tag.blue { background-color: #99c2ff; }
    .badge-tag.pink { background-color: #ffb3c6; }
    .badge-tag.green { background-color: #a3f7bf; }
    .section-title {
      font-size: 2.1rem;
      font-weight: 800;
      line-height: 1.3;
      color: var(--text-main);
      margin-bottom: 14px;
    }
    .section-sub {
      font-size: 1.05rem;
      color: var(--text-muted);
      max-width: 720px;
      margin: 0 auto;
    }

    /* Hero 首屏 - 撞色极简无图风格 */
    .hero-section {
      padding: 80px 0 60px;
      background: linear-gradient(135deg, #fffbf0 0%, #ffffff 50%, #f0f6ff 100%);
      border-bottom: 2px solid var(--border-contrast);
      position: relative;
      overflow: hidden;
    }
    .hero-content {
      max-width: 880px;
      margin: 0 auto;
      text-align: center;
    }
    .hero-highlight-tag {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 16px;
      border-radius: 999px;
      background-color: #fff;
      border: 2px solid var(--border-contrast);
      font-weight: 700;
      font-size: 0.9rem;
      box-shadow: 3px 3px 0 var(--border-contrast);
      margin-bottom: 24px;
    }
    .hero-highlight-tag .dot {
      width: 10px;
      height: 10px;
      background-color: var(--primary);
      border-radius: 50%;
      display: inline-block;
      box-shadow: 0 0 0 2px rgba(255, 59, 48, 0.3);
    }
    h1.hero-h1 {
      font-size: 2.85rem;
      font-weight: 900;
      line-height: 1.25;
      color: var(--text-main);
      letter-spacing: -0.8px;
      margin-bottom: 20px;
    }
    h1.hero-h1 span.color-strike {
      background: linear-gradient(180deg, transparent 65%, #ffd633 65%);
      display: inline;
      padding: 0 6px;
    }
    p.hero-desc {
      font-size: 1.2rem;
      line-height: 1.65;
      color: var(--text-muted);
      margin-bottom: 36px;
      font-weight: 500;
    }
    .hero-cta-group {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 16px;
      margin-bottom: 48px;
    }
    .btn-main-primary {
      padding: 15px 34px;
      font-size: 1.15rem;
      font-weight: 800;
      background-color: var(--primary);
      color: #ffffff;
      border: 2px solid var(--border-contrast);
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-hard);
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }
    .btn-main-primary:hover {
      transform: translate(-2px, -2px);
      box-shadow: 6px 6px 0px var(--border-contrast);
      background-color: var(--primary-hover);
    }
    .btn-main-secondary {
      padding: 15px 30px;
      font-size: 1.1rem;
      font-weight: 800;
      background-color: #ffffff;
      color: var(--text-main);
      border: 2px solid var(--border-contrast);
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-hard);
    }
    .btn-main-secondary:hover {
      transform: translate(-2px, -2px);
      box-shadow: 6px 6px 0px var(--border-contrast);
      background-color: var(--bg-secondary);
    }
    .hero-metrics-bar {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
      margin-top: 20px;
    }
    .metric-card {
      background: #ffffff;
      border: 2px solid var(--border-contrast);
      border-radius: var(--radius-md);
      padding: 18px 14px;
      text-align: center;
      box-shadow: 3px 3px 0 var(--border-contrast);
    }
    .metric-num {
      font-size: 1.9rem;
      font-weight: 900;
      color: var(--accent-blue);
      margin-bottom: 4px;
      font-feature-settings: "tnum";
    }
    .metric-label {
      font-size: 0.88rem;
      font-weight: 700;
      color: var(--text-muted);
    }

    /* 通用章节容器 */
    section.page-section {
      padding: 72px 0;
      border-bottom: 2px solid var(--border-contrast);
    }
    .bg-light-alt {
      background-color: var(--bg-secondary);
    }
    .bg-light-accent {
      background-color: #f6f8fe;
    }

    /* 平台介绍与关于我们 */
    .about-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 36px;
      align-items: center;
    }
    .about-left {
      padding-right: 12px;
    }
    .about-lead {
      font-size: 1.35rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 16px;
      line-height: 1.4;
    }
    .about-paragraph {
      font-size: 1rem;
      color: var(--text-muted);
      margin-bottom: 16px;
    }
    .about-pill-list {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      margin-top: 22px;
    }
    .about-pill {
      padding: 6px 14px;
      background: #ffffff;
      border: 2px solid var(--border-contrast);
      border-radius: 999px;
      font-size: 0.88rem;
      font-weight: 700;
      box-shadow: 2px 2px 0 var(--border-contrast);
    }
    .about-right-feature {
      background: #ffffff;
      border: 2px solid var(--border-contrast);
      border-radius: var(--radius-lg);
      padding: 30px;
      box-shadow: var(--shadow-hard);
    }
    .platform-capsule-item {
      display: flex;
      gap: 16px;
      margin-bottom: 20px;
    }
    .platform-capsule-item:last-child {
      margin-bottom: 0;
    }
    .capsule-icon {
      width: 44px;
      height: 44px;
      min-width: 44px;
      background-color: var(--accent-yellow);
      border: 2px solid var(--border-contrast);
      border-radius: 10px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 900;
      font-size: 1.2rem;
      box-shadow: 2px 2px 0 var(--border-contrast);
    }
    .capsule-body h4 {
      font-size: 1.05rem;
      font-weight: 800;
      margin-bottom: 4px;
    }
    .capsule-body p {
      font-size: 0.9rem;
      color: var(--text-muted);
    }

    /* 服务网格卡片 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .service-card {
      background: #ffffff;
      border: 2px solid var(--border-contrast);
      border-radius: var(--radius-md);
      padding: 26px;
      box-shadow: var(--shadow-hard);
      transition: transform 0.2s ease, box-shadow 0.2s ease;
      display: flex;
      flex-direction: column;
    }
    .service-card:hover {
      transform: translate(-3px, -3px);
      box-shadow: 7px 7px 0px var(--border-contrast);
    }
    .service-head {
      display: flex;
      justify-content: space-between;
      align-items: flex-start;
      margin-bottom: 14px;
    }
    .service-card-title {
      font-size: 1.25rem;
      font-weight: 800;
      color: var(--text-main);
    }
    .service-desc {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.55;
      margin-bottom: 18px;
      flex-grow: 1;
    }
    .service-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 6px;
    }
    .tag-micro {
      font-size: 0.76rem;
      padding: 3px 8px;
      background: var(--bg-secondary);
      border-radius: 4px;
      font-weight: 700;
      color: var(--text-main);
      border: 1px solid var(--border-color);
    }

    /* 支持模型滚动流式展示 */
    .models-marquee-wrap {
      background: #ffffff;
      border: 2px solid var(--border-contrast);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--shadow-hard);
      margin-top: 36px;
    }
    .models-marquee-title {
      font-weight: 800;
      font-size: 1.05rem;
      margin-bottom: 16px;
      text-align: center;
    }
    .models-chip-pool {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 10px;
    }
    .model-chip {
      padding: 6px 14px;
      font-size: 0.85rem;
      font-weight: 700;
      background: #fff;
      border: 1.5px solid var(--border-contrast);
      border-radius: 8px;
      box-shadow: 2px 2px 0 var(--border-contrast);
    }

    /* 流程步骤 */
    .steps-timeline {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      margin-top: 10px;
    }
    .step-card {
      background: #ffffff;
      border: 2px solid var(--border-contrast);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: 3px 3px 0 var(--border-contrast);
      position: relative;
    }
    .step-badge {
      display: inline-block;
      background: var(--primary);
      color: #fff;
      font-weight: 900;
      font-size: 0.85rem;
      padding: 3px 10px;
      border-radius: 999px;
      margin-bottom: 12px;
      border: 1.5px solid var(--border-contrast);
    }
    .step-title {
      font-size: 1.12rem;
      font-weight: 800;
      margin-bottom: 8px;
    }
    .step-desc {
      font-size: 0.88rem;
      color: var(--text-muted);
      line-height: 1.5;
    }

    /* 案例中心图文展示 */
    .cases-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 28px;
    }
    .case-card {
      background: #ffffff;
      border: 2px solid var(--border-contrast);
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-hard);
      display: flex;
      flex-direction: column;
    }
    .case-media-box {
      background-color: #000;
      width: 100%;
      overflow: hidden;
      border-bottom: 2px solid var(--border-contrast);
      display: flex;
      align-items: center;
      justify-content: center;
    }
    .case-media-box img {
      width: 100%;
      height: auto;
      max-height: 320px;
      object-fit: cover;
      display: block;
    }
    .case-body {
      padding: 24px;
      flex-grow: 1;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .case-body h3 {
      font-size: 1.25rem;
      font-weight: 800;
      margin-bottom: 8px;
    }
    .case-body p {
      font-size: 0.92rem;
      color: var(--text-muted);
      margin-bottom: 16px;
    }

    /* 对比评测高亮板块 */
    .comparison-section-box {
      background: #ffffff;
      border: 3px solid var(--border-contrast);
      border-radius: var(--radius-lg);
      padding: 36px;
      box-shadow: var(--shadow-hard);
    }
    .rating-banner {
      background: #fff8d6;
      border: 2px solid var(--border-contrast);
      border-radius: var(--radius-md);
      padding: 20px 28px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 16px;
      margin-bottom: 30px;
      box-shadow: 3px 3px 0 var(--border-contrast);
    }
    .rating-left h3 {
      font-size: 1.35rem;
      font-weight: 900;
      color: var(--text-main);
    }
    .rating-stars {
      color: #ff9900;
      font-size: 1.4rem;
      letter-spacing: 2px;
    }
    .rating-score-box {
      display: flex;
      align-items: baseline;
      gap: 6px;
    }
    .score-value {
      font-size: 2.8rem;
      font-weight: 900;
      color: var(--primary);
      line-height: 1;
    }
    .score-total {
      font-size: 1.1rem;
      font-weight: 800;
      color: var(--text-muted);
    }
    .table-container {
      width: 100%;
      overflow-x: auto;
    }
    table.compare-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      font-size: 0.95rem;
    }
    table.compare-table th, table.compare-table td {
      padding: 16px 18px;
      border-bottom: 1.5px solid var(--border-color);
    }
    table.compare-table th {
      background: var(--bg-secondary);
      font-weight: 800;
      color: var(--text-main);
      border-top: 2px solid var(--border-contrast);
      border-bottom: 2px solid var(--border-contrast);
    }
    table.compare-table tr:hover td {
      background-color: #fafbfc;
    }
    .highlight-col {
      background-color: #fffde6;
      font-weight: 700;
      color: #b32d00;
    }

    /* 客户评论板块 */
    .testimonials-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 22px;
    }
    .testimonial-card {
      background: #ffffff;
      border: 2px solid var(--border-contrast);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--shadow-hard);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .testi-content {
      font-size: 0.95rem;
      color: var(--text-main);
      line-height: 1.6;
      margin-bottom: 18px;
      font-style: normal;
    }
    .testi-author {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1.5px solid var(--border-color);
      padding-top: 14px;
    }
    .author-avatar {
      width: 42px;
      height: 42px;
      border-radius: 50%;
      border: 2px solid var(--border-contrast);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      background-color: var(--accent-yellow);
      font-size: 1rem;
    }
    .author-info h4 {
      font-size: 0.95rem;
      font-weight: 800;
    }
    .author-info p {
      font-size: 0.8rem;
      color: var(--text-muted);
    }

    /* FAQ 手风琴 */
    .faq-wrapper {
      max-width: 900px;
      margin: 0 auto;
    }
    .faq-item {
      background: #ffffff;
      border: 2px solid var(--border-contrast);
      border-radius: var(--radius-md);
      margin-bottom: 14px;
      box-shadow: 2px 2px 0 var(--border-contrast);
      overflow: hidden;
      transition: all 0.2s ease;
    }
    .faq-question {
      padding: 18px 24px;
      font-size: 1.05rem;
      font-weight: 800;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      background: #fff;
    }
    .faq-question:hover {
      background-color: #fcfcfc;
    }
    .faq-arrow {
      font-size: 1.1rem;
      transition: transform 0.2s ease;
    }
    .faq-answer {
      padding: 0 24px 20px;
      font-size: 0.95rem;
      color: var(--text-muted);
      line-height: 1.65;
      display: none;
      border-top: 1px dashed var(--border-color);
      padding-top: 16px;
    }
    .faq-item.active .faq-answer {
      display: block;
    }
    .faq-item.active .faq-arrow {
      transform: rotate(180deg);
    }

    /* 需求匹配与联系我们表单 */
    .contact-wrapper-grid {
      display: grid;
      grid-template-columns: 1fr 1.2fr;
      gap: 36px;
    }
    .contact-info-panel {
      background: #ffffff;
      border: 2px solid var(--border-contrast);
      border-radius: var(--radius-lg);
      padding: 32px;
      box-shadow: var(--shadow-hard);
    }
    .contact-info-item {
      margin-bottom: 22px;
    }
    .contact-info-item h4 {
      font-size: 1rem;
      font-weight: 800;
      margin-bottom: 6px;
      color: var(--text-main);
    }
    .contact-info-item p {
      font-size: 0.95rem;
      color: var(--text-muted);
    }
    .qr-block {
      text-align: center;
      background: var(--bg-secondary);
      border: 2px dashed var(--border-contrast);
      border-radius: var(--radius-md);
      padding: 20px;
      margin-top: 20px;
    }
    .qr-block img {
      width: 140px;
      height: 140px;
      object-fit: contain;
      border-radius: 8px;
      border: 2px solid var(--border-contrast);
      background: #fff;
      display: block;
      margin: 0 auto 10px;
    }
    .qr-desc {
      font-size: 0.85rem;
      font-weight: 700;
      color: var(--text-main);
    }
    .form-panel {
      background: #ffffff;
      border: 2px solid var(--border-contrast);
      border-radius: var(--radius-lg);
      padding: 36px;
      box-shadow: var(--shadow-hard);
    }
    .form-group {
      margin-bottom: 18px;
    }
    .form-group label {
      display: block;
      font-size: 0.92rem;
      font-weight: 800;
      margin-bottom: 8px;
      color: var(--text-main);
    }
    .form-control {
      width: 100%;
      padding: 12px 16px;
      font-size: 0.95rem;
      border: 2px solid var(--border-contrast);
      border-radius: var(--radius-sm);
      outline: none;
      background: #fff;
      font-family: inherit;
      box-shadow: 2px 2px 0 transparent;
      transition: all 0.2s;
    }
    .form-control:focus {
      border-color: var(--accent-blue);
      box-shadow: 3px 3px 0 var(--border-contrast);
    }
    textarea.form-control {
      resize: vertical;
      min-height: 100px;
    }
    .btn-submit-form {
      width: 100%;
      padding: 14px;
      font-size: 1.05rem;
      font-weight: 800;
      background: var(--accent-yellow);
      color: var(--text-main);
      border: 2px solid var(--border-contrast);
      border-radius: var(--radius-sm);
      box-shadow: var(--shadow-hard);
      cursor: pointer;
      transition: all 0.2s;
    }
    .btn-submit-form:hover {
      transform: translate(-2px, -2px);
      box-shadow: 6px 6px 0 var(--border-contrast);
      background: #ffd633;
    }

    /* 行业资讯与文章 */
    .articles-box {
      background: #ffffff;
      border: 2px solid var(--border-contrast);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--shadow-hard);
      margin-bottom: 30px;
    }
    .articles-links-cluster {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 14px;
    }
    .art-link-btn {
      padding: 8px 16px;
      background: #f8fafc;
      border: 1.5px solid var(--border-contrast);
      border-radius: 6px;
      font-size: 0.88rem;
      font-weight: 700;
      color: var(--text-main);
      box-shadow: 2px 2px 0 var(--border-contrast);
    }
    .art-link-btn:hover {
      background: var(--accent-yellow);
    }

    /* 底部专属布局与友链 */
    footer.site-footer {
      background-color: #ffffff;
      border-top: 3px solid var(--border-contrast);
      padding: 50px 0 30px;
    }
    .footer-top {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 40px;
      margin-bottom: 40px;
    }
    .footer-desc {
      font-size: 0.92rem;
      color: var(--text-muted);
      margin-top: 14px;
      line-height: 1.6;
      max-width: 440px;
    }
    .footer-col h4 {
      font-size: 1.05rem;
      font-weight: 800;
      margin-bottom: 16px;
      color: var(--text-main);
      position: relative;
    }
    .footer-links-list {
      list-style: none;
    }
    .footer-links-list li {
      margin-bottom: 8px;
    }
    .footer-links-list li a {
      font-size: 0.9rem;
      color: var(--text-muted);
      font-weight: 600;
    }
    .footer-links-list li a:hover {
      color: var(--primary);
    }
    .friendship-links {
      border-top: 1.5px dashed var(--border-color);
      padding-top: 24px;
      margin-bottom: 30px;
    }
    .friendship-links h5 {
      font-size: 0.95rem;
      font-weight: 800;
      margin-bottom: 12px;
      color: var(--text-main);
    }
    .friend-links-pool {
      display: flex;
      flex-wrap: wrap;
      gap: 14px;
    }
    .friend-links-pool a {
      font-size: 0.88rem;
      font-weight: 600;
      color: var(--accent-blue);
      text-decoration: underline;
    }
    .friend-links-pool a:hover {
      color: var(--primary);
    }
    .footer-bottom {
      border-top: 2px solid var(--border-contrast);
      padding-top: 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 16px;
      font-size: 0.88rem;
      color: var(--text-muted);
      font-weight: 600;
    }

    /* 浮动客服挂件 */
    .float-service-widget {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 990;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .float-btn {
      width: 50px;
      height: 50px;
      border-radius: 50%;
      background: var(--accent-yellow);
      border: 2px solid var(--border-contrast);
      box-shadow: 3px 3px 0 var(--border-contrast);
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      font-weight: 900;
      font-size: 1.1rem;
      color: var(--text-main);
    }
    .float-btn:hover {
      transform: scale(1.05);
    }
    .float-btn.back-to-top {
      background: #ffffff;
      display: none;
    }

    /* 响应式调整 */
    @media (max-width: 992px) {
      h1.hero-h1 { font-size: 2.2rem; }
      .services-grid, .testimonials-grid { grid-template-columns: repeat(2, 1fr); }
      .about-grid, .contact-wrapper-grid, .cases-grid { grid-template-columns: 1fr; }
      .steps-timeline { grid-template-columns: repeat(2, 1fr); }
      .hero-metrics-bar { grid-template-columns: repeat(2, 1fr); }
      .footer-top { grid-template-columns: 1fr; gap: 30px; }
      .nav-links { display: none; }
      .mobile-menu-toggle { display: block; }
      .nav-links.active {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #ffffff;
        border-bottom: 2px solid var(--border-contrast);
        padding: 20px;
        gap: 8px;
        box-shadow: var(--shadow-md);
      }
    }
    @media (max-width: 640px) {
      h1.hero-h1 { font-size: 1.8rem; }
      .services-grid, .testimonials-grid, .steps-timeline, .hero-metrics-bar { grid-template-columns: 1fr; }
      .hero-section { padding: 48px 0 40px; }
      .section-title { font-size: 1.65rem; }
      .btn-main-primary, .btn-main-secondary { width: 100%; justify-content: center; }
      .comparison-section-box { padding: 20px; }
      .form-panel, .contact-info-panel { padding: 22px; }
    }