:root {
      --primary: #0252cf;
      --primary-hover: #013ea1;
      --primary-light: #eaf1fc;
      --accent: #00d2ff;
      --accent-bright: #ff6b35;
      --text-main: #1e293b;
      --text-muted: #64748b;
      --text-dark: #0f172a;
      --bg-page: #f8fafc;
      --bg-card: #ffffff;
      --border-color: #e2e8f0;
      --border-focus: #3b82f6;
      --shadow-sm: 0 2px 4px rgba(2, 82, 207, 0.04);
      --shadow-md: 0 8px 20px rgba(2, 82, 207, 0.08);
      --shadow-lg: 0 16px 36px rgba(2, 82, 207, 0.12);
      --radius: 12px;
      --transition: all 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, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      color: var(--text-main);
      background-color: var(--bg-page);
      line-height: 1.65;
      overflow-x: hidden;
    }

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

    img {
      max-width: 100%;
      height: auto;
      display: block;
    }

    .container {
      width: 100%;
      max-width: 1200px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 20px;
      padding-right: 20px;
    }

    .section-padding {
      padding: 72px 0;
    }

    .section-header {
      text-align: center;
      max-width: 820px;
      margin: 0 auto 48px;
    }

    .section-badge {
      display: inline-block;
      padding: 6px 16px;
      font-size: 0.875rem;
      font-weight: 600;
      color: var(--primary);
      background-color: var(--primary-light);
      border-radius: 9999px;
      margin-bottom: 12px;
      letter-spacing: 0.5px;
    }

    .section-title {
      font-size: 2.1rem;
      color: var(--text-dark);
      font-weight: 800;
      line-height: 1.35;
      margin-bottom: 16px;
    }

    .section-desc {
      font-size: 1.05rem;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* 顶部导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(255, 255, 255, 0.94);
      backdrop-filter: blur(10px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 74px;
    }

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

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

    .brand-title {
      font-size: 1.28rem;
      font-weight: 800;
      color: var(--primary);
      letter-spacing: -0.5px;
    }

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

    .nav-links li a {
      padding: 8px 12px;
      font-size: 0.93rem;
      font-weight: 500;
      color: var(--text-main);
      border-radius: 6px;
      white-space: nowrap;
    }

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

    .header-cta-group {
      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: var(--transition);
      text-align: center;
    }

    .btn-primary {
      background: linear-gradient(135deg, #0252cf 0%, #0084ff 100%);
      color: #ffffff;
      box-shadow: 0 4px 14px rgba(2, 82, 207, 0.35);
    }

    .btn-primary:hover {
      background: linear-gradient(135deg, #013ea1 0%, #006dd4 100%);
      transform: translateY(-1px);
      box-shadow: 0 6px 18px rgba(2, 82, 207, 0.45);
      color: #ffffff;
    }

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

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

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

    .mobile-menu-btn {
      display: none;
      background: transparent;
      border: none;
      cursor: pointer;
      padding: 8px;
    }

    .mobile-menu-btn svg {
      width: 26px;
      height: 26px;
      fill: var(--text-dark);
    }

    /* 首屏 HERO - 规则严控：绝无任何图片，纯代码打造震撼科技感 */
    .hero-section {
      position: relative;
      background: linear-gradient(180deg, #eff5ff 0%, #f8fafc 100%);
      padding: 90px 0 80px;
      overflow: hidden;
      border-bottom: 1px solid var(--border-color);
    }

    .hero-decor-circle1 {
      position: absolute;
      top: -80px;
      right: -80px;
      width: 480px;
      height: 480px;
      border-radius: 50%;
      background: radial-gradient(circle, rgba(0, 132, 255, 0.12) 0%, rgba(2, 82, 207, 0) 70%);
      pointer-events: none;
    }

    .hero-decor-circle2 {
      position: absolute;
      bottom: -60px;
      left: -60px;
      width: 380px;
      height: 380px;
      border-radius: 50%;
      background: radial-gradient(circle, rgba(0, 210, 255, 0.1) 0%, rgba(2, 82, 207, 0) 70%);
      pointer-events: none;
    }

    .hero-content {
      position: relative;
      z-index: 2;
      text-align: center;
      max-width: 960px;
      margin: 0 auto;
    }

    .hero-tag {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 7px 20px;
      border-radius: 9999px;
      background: #ffffff;
      border: 1px solid #c7dcff;
      color: var(--primary);
      font-weight: 600;
      font-size: 0.92rem;
      margin-bottom: 24px;
      box-shadow: var(--shadow-sm);
    }

    .hero-title {
      font-size: 2.85rem;
      font-weight: 900;
      color: var(--text-dark);
      line-height: 1.25;
      letter-spacing: -0.5px;
      margin-bottom: 24px;
    }

    .hero-title .highlight {
      color: var(--primary);
      background: linear-gradient(135deg, #0252cf 0%, #008cff 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-subtitle {
      font-size: 1.2rem;
      color: var(--text-muted);
      line-height: 1.8;
      margin-bottom: 38px;
      max-width: 820px;
      margin-left: auto;
      margin-right: auto;
    }

    .hero-actions {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 18px;
      flex-wrap: wrap;
      margin-bottom: 50px;
    }

    .hero-features-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 18px;
      margin-top: 10px;
    }

    .hero-feat-card {
      background: #ffffff;
      padding: 22px 18px;
      border-radius: var(--radius);
      border: 1px solid #dce7f7;
      box-shadow: var(--shadow-sm);
      text-align: left;
      transition: var(--transition);
    }

    .hero-feat-card:hover {
      transform: translateY(-4px);
      border-color: #b7d3fc;
      box-shadow: var(--shadow-md);
    }

    .feat-icon-badge {
      width: 44px;
      height: 44px;
      border-radius: 10px;
      background: var(--primary-light);
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 14px;
      color: var(--primary);
    }

    .hero-feat-card h3 {
      font-size: 1.05rem;
      font-weight: 700;
      color: var(--text-dark);
      margin-bottom: 6px;
    }

    .hero-feat-card p {
      font-size: 0.86rem;
      color: var(--text-muted);
      line-height: 1.55;
    }

    /* 数据指标栏 */
    .metrics-bar {
      background: #ffffff;
      border-top: 1px solid var(--border-color);
      border-bottom: 1px solid var(--border-color);
      padding: 36px 0;
    }

    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      text-align: center;
    }

    .metric-item {
      padding: 10px 16px;
      border-right: 1px solid var(--border-color);
    }

    .metric-item:last-child {
      border-right: none;
    }

    .metric-number {
      font-size: 2.3rem;
      font-weight: 900;
      color: var(--primary);
      margin-bottom: 4px;
      line-height: 1.1;
    }

    .metric-label {
      font-size: 0.95rem;
      color: var(--text-muted);
      font-weight: 500;
    }

    /* 卡片通用网格 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 22px;
    }

    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 32px;
    }

    .card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 28px;
      transition: var(--transition);
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
    }

    .card:hover {
      border-color: #bfdbfe;
      box-shadow: var(--shadow-md);
      transform: translateY(-3px);
    }

    /* 场景与能力卡片 */
    .service-card-tag {
      align-self: flex-start;
      font-size: 0.78rem;
      font-weight: 700;
      color: var(--primary);
      background: var(--primary-light);
      padding: 4px 10px;
      border-radius: 4px;
      margin-bottom: 14px;
    }

    .service-card h3 {
      font-size: 1.22rem;
      color: var(--text-dark);
      font-weight: 700;
      margin-bottom: 10px;
    }

    .service-card p {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.65;
      margin-bottom: 16px;
      flex-grow: 1;
    }

    .service-meta-list {
      list-style: none;
      border-top: 1px solid var(--border-color);
      padding-top: 14px;
      font-size: 0.85rem;
      color: var(--text-main);
    }

    .service-meta-list li {
      display: flex;
      align-items: center;
      gap: 8px;
      margin-bottom: 6px;
    }

    .service-meta-list li::before {
      content: "•";
      color: var(--primary);
      font-weight: bold;
    }

    /* 平台模型矩阵 */
    .model-tags-wrapper {
      background: #ffffff;
      padding: 32px;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      margin-bottom: 40px;
      box-shadow: var(--shadow-sm);
    }

    .model-tags-title {
      font-size: 1.15rem;
      font-weight: 700;
      color: var(--text-dark);
      margin-bottom: 16px;
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .model-tags-title::before {
      content: "";
      width: 4px;
      height: 18px;
      background: var(--primary);
      border-radius: 2px;
    }

    .model-cloud {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
    }

    .model-pill {
      background: #f1f5f9;
      color: var(--text-main);
      padding: 6px 14px;
      border-radius: 20px;
      font-size: 0.88rem;
      font-weight: 500;
      border: 1px solid #e2e8f0;
      transition: var(--transition);
    }

    .model-pill:hover {
      background: var(--primary);
      color: #ffffff;
      border-color: var(--primary);
      transform: translateY(-2px);
    }

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

    .process-step-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 28px 22px;
      text-align: center;
      position: relative;
      box-shadow: var(--shadow-sm);
    }

    .step-num-badge {
      width: 42px;
      height: 42px;
      background: var(--primary);
      color: #ffffff;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 16px;
      font-size: 1.15rem;
      font-weight: 800;
    }

    .process-step-item h3 {
      font-size: 1.12rem;
      color: var(--text-dark);
      margin-bottom: 8px;
    }

    .process-step-item p {
      font-size: 0.88rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 案例图片展示模块 */
    .media-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }

    .media-card:hover {
      transform: translateY(-3px);
      box-shadow: var(--shadow-md);
    }

    .media-card-img-wrap {
      width: 100%;
      overflow: hidden;
      background: #e2e8f0;
    }

    .media-card-img-wrap img {
      width: 100%;
      height: 220px;
      object-fit: cover;
      transition: transform 0.5s ease;
    }

    .media-card:hover .media-card-img-wrap img {
      transform: scale(1.03);
    }

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

    .media-card-body h3 {
      font-size: 1.12rem;
      color: var(--text-dark);
      margin-bottom: 8px;
      font-weight: 700;
    }

    .media-card-body p {
      font-size: 0.88rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 对比评测表格与卡片 */
    .rating-banner {
      background: linear-gradient(135deg, #0252cf 0%, #006dd4 100%);
      color: #ffffff;
      border-radius: var(--radius);
      padding: 36px 40px;
      margin-bottom: 36px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 24px;
    }

    .rating-score-box {
      display: flex;
      align-items: baseline;
      gap: 12px;
    }

    .rating-big {
      font-size: 3.5rem;
      font-weight: 900;
      line-height: 1;
    }

    .rating-scale {
      font-size: 1.3rem;
      opacity: 0.85;
    }

    .rating-stars {
      color: #ffd159;
      font-size: 1.5rem;
      margin-top: 4px;
    }

    .rating-text h3 {
      font-size: 1.5rem;
      margin-bottom: 8px;
    }

    .rating-text p {
      font-size: 0.98rem;
      opacity: 0.9;
      max-width: 650px;
    }

    .table-container {
      width: 100%;
      overflow-x: auto;
      background: #ffffff;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

    .comparison-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 720px;
    }

    .comparison-table th,
    .comparison-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
      font-size: 0.92rem;
    }

    .comparison-table th {
      background: #f1f5f9;
      font-weight: 700;
      color: var(--text-dark);
    }

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

    .highlight-col {
      background: #f0f7ff;
      font-weight: 600;
      color: var(--primary);
    }

    .badge-check {
      display: inline-flex;
      align-items: center;
      gap: 4px;
      color: #10b981;
      font-weight: 600;
    }

    /* Token比价卡片 */
    .token-tier-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 30px;
      text-align: center;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      position: relative;
    }

    .token-tier-card.featured {
      border: 2px solid var(--primary);
      box-shadow: var(--shadow-md);
    }

    .token-tier-card.featured::before {
      content: "爆款推荐";
      position: absolute;
      top: -12px;
      left: 50%;
      transform: translateX(-50%);
      background: var(--primary);
      color: #ffffff;
      padding: 2px 14px;
      border-radius: 20px;
      font-size: 0.75rem;
      font-weight: 700;
    }

    .token-tier-card h3 {
      font-size: 1.25rem;
      margin-bottom: 12px;
      color: var(--text-dark);
    }

    .price-value {
      font-size: 2.2rem;
      font-weight: 900;
      color: var(--primary);
      margin-bottom: 6px;
    }

    .price-sub {
      font-size: 0.85rem;
      color: var(--text-muted);
      margin-bottom: 20px;
    }

    .tier-features {
      list-style: none;
      text-align: left;
      margin-bottom: 24px;
      font-size: 0.9rem;
      color: var(--text-main);
    }

    .tier-features li {
      padding: 8px 0;
      border-bottom: 1px dashed var(--border-color);
      display: flex;
      align-items: center;
      gap: 8px;
    }

    /* 用户评论 */
    .review-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 26px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .review-text {
      font-size: 0.92rem;
      color: var(--text-main);
      line-height: 1.7;
      margin-bottom: 18px;
      font-style: normal;
    }

    .review-author {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid var(--border-color);
      padding-top: 14px;
    }

    .author-avatar-badge {
      width: 42px;
      height: 42px;
      background: var(--primary-light);
      color: var(--primary);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      font-size: 1.1rem;
    }

    .author-info h4 {
      font-size: 0.95rem;
      font-weight: 700;
      color: var(--text-dark);
    }

    .author-info p {
      font-size: 0.8rem;
      color: var(--text-muted);
    }

    /* FAQ 手风琴面板 */
    .faq-wrapper {
      max-width: 920px;
      margin: 0 auto;
    }

    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      margin-bottom: 14px;
      overflow: hidden;
      transition: var(--transition);
    }

    .faq-question {
      width: 100%;
      text-align: left;
      background: transparent;
      border: none;
      padding: 20px 24px;
      font-size: 1.05rem;
      font-weight: 600;
      color: var(--text-dark);
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 16px;
    }

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

    .faq-icon {
      width: 20px;
      height: 20px;
      flex-shrink: 0;
      transition: transform 0.3s ease;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      background: #fafcff;
      border-top: 1px solid transparent;
      padding: 0 24px;
      color: var(--text-muted);
      font-size: 0.94rem;
      line-height: 1.7;
    }

    .faq-item.active {
      border-color: #bfdbfe;
    }

    .faq-item.active .faq-answer {
      max-height: 260px;
      padding: 18px 24px 22px;
      border-top-color: #e2e8f0;
    }

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

    /* 文章与百科模块 */
    .article-list-wrap {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 28px;
      box-shadow: var(--shadow-sm);
    }

    .article-links-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 16px;
      margin-top: 16px;
    }

    .article-link-item {
      display: flex;
      align-items: center;
      gap: 12px;
      padding: 12px 16px;
      background: #f8fafc;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      font-size: 0.92rem;
      color: var(--text-main);
      transition: var(--transition);
    }

    .article-link-item:hover {
      background: var(--primary-light);
      border-color: #bfdbfe;
      color: var(--primary);
      transform: translateX(4px);
    }

    /* 表单区域 */
    .form-container-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 40px;
      box-shadow: var(--shadow-md);
    }

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

    .form-label {
      display: block;
      font-size: 0.92rem;
      font-weight: 600;
      color: var(--text-dark);
      margin-bottom: 8px;
    }

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

    .form-input:focus,
    .form-select:focus,
    .form-textarea:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(2, 82, 207, 0.15);
    }

    .form-textarea {
      min-height: 120px;
      resize: vertical;
    }

    /* 联系与客服专区 */
    .contact-card-info {
      background: linear-gradient(180deg, #ffffff 0%, #f0f6ff 100%);
      border: 1px solid #c7dcff;
      border-radius: var(--radius);
      padding: 32px;
      display: flex;
      flex-direction: column;
      align-items: center;
      text-align: center;
    }

    .qr-container {
      width: 170px;
      height: 170px;
      background: #ffffff;
      padding: 8px;
      border-radius: 12px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      margin-bottom: 16px;
    }

    .qr-container img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      border-radius: 6px;
    }

    .contact-details-list {
      list-style: none;
      text-align: left;
      width: 100%;
      margin-top: 18px;
      font-size: 0.92rem;
    }

    .contact-details-list li {
      padding: 8px 0;
      border-bottom: 1px dashed #d0ddec;
      display: flex;
      justify-content: space-between;
    }

    .contact-details-list span:first-child {
      color: var(--text-muted);
    }

    .contact-details-list span:last-child {
      color: var(--text-dark);
      font-weight: 600;
    }

    /* 友情链接与页脚 */
    .friend-links-area {
      background: #ffffff;
      border-top: 1px solid var(--border-color);
      padding: 32px 0;
    }

    .friend-links-title {
      font-size: 0.95rem;
      font-weight: 700;
      color: var(--text-dark);
      margin-bottom: 14px;
    }

    .friend-links-list {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
    }

    .friend-links-list a {
      font-size: 0.88rem;
      color: var(--text-muted);
      background: #f1f5f9;
      padding: 6px 14px;
      border-radius: 6px;
    }

    .friend-links-list a:hover {
      background: var(--primary-light);
      color: var(--primary);
    }

    .site-footer {
      background: #0f172a;
      color: #94a3b8;
      padding: 48px 0 32px;
      font-size: 0.88rem;
    }

    .footer-content {
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 20px;
    }

    .footer-left p {
      margin-top: 6px;
      font-size: 0.85rem;
      color: #64748b;
    }

    .footer-right {
      display: flex;
      gap: 20px;
    }

    .footer-right a {
      color: #cbd5e1;
    }

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

    /* 浮动操作栏与返回顶部 */
    .float-dock {
      position: fixed;
      right: 24px;
      bottom: 30px;
      z-index: 99;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .float-btn {
      width: 46px;
      height: 46px;
      background: #ffffff;
      color: var(--primary);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
      border: 1px solid var(--border-color);
      cursor: pointer;
      transition: var(--transition);
    }

    .float-btn:hover {
      background: var(--primary);
      color: #ffffff;
      transform: translateY(-3px);
    }

    /* 移动端与响应式适配 */
    @media (max-width: 992px) {
      .hero-title {
        font-size: 2.3rem;
      }
      .hero-features-grid,
      .grid-4,
      .process-step-list {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
      .metrics-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 18px;
      }
      .metric-item:nth-child(2) {
        border-right: none;
      }
      .nav-links {
        display: none;
      }
      .mobile-menu-btn {
        display: block;
      }
      .article-links-grid {
        grid-template-columns: 1fr;
      }
    }

    @media (max-width: 768px) {
      .section-padding {
        padding: 52px 0;
      }
      .hero-title {
        font-size: 1.85rem;
      }
      .hero-subtitle {
        font-size: 1.05rem;
      }
      .hero-features-grid,
      .grid-4,
      .grid-3,
      .grid-2,
      .process-step-list {
        grid-template-columns: 1fr;
      }
      .metrics-grid {
        grid-template-columns: 1fr;
      }
      .metric-item {
        border-right: none;
        border-bottom: 1px solid var(--border-color);
        padding-bottom: 16px;
      }
      .metric-item:last-child {
        border-bottom: none;
      }
      .rating-banner {
        padding: 24px;
      }
      .form-container-card {
        padding: 24px;
      }
    }

    /* 移动端菜单激活态 */
    .mobile-nav-panel {
      display: none;
      position: absolute;
      top: 74px;
      left: 0;
      width: 100%;
      background: #ffffff;
      box-shadow: 0 10px 20px rgba(0,0,0,0.1);
      border-bottom: 1px solid var(--border-color);
      padding: 16px 20px;
    }

    .mobile-nav-panel.show {
      display: block;
    }

    .mobile-nav-panel ul {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .mobile-nav-panel ul li a {
      display: block;
      padding: 10px;
      color: var(--text-dark);
      font-weight: 600;
      border-radius: 6px;
    }

    .mobile-nav-panel ul li a:hover {
      background: var(--primary-light);
      color: var(--primary);
    }