:root {
      --primary-color: #2563eb;
      --primary-dark: #1d4ed8;
      --accent-coral: #ff5e62;
      --accent-cyan: #06b6d4;
      --accent-amber: #f59e0b;
      --accent-emerald: #10b981;
      --accent-purple: #8b5cf6;
      --bg-page: #f8fafc;
      --bg-surface: #ffffff;
      --text-main: #0f172a;
      --text-muted: #475569;
      --border-light: #e2e8f0;
      --container-max: 1200px;
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --shadow-sm: 0 2px 4px rgba(15, 23, 42, 0.04);
      --shadow-md: 0 10px 25px -5px rgba(15, 23, 42, 0.08);
      --shadow-lg: 0 20px 35px -10px rgba(15, 23, 42, 0.12);
    }
    *, *::before, *::after {
      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;
      background-color: var(--bg-page);
      color: var(--text-main);
      line-height: 1.6;
      position: relative;
      overflow-x: hidden;
      background-image: 
        radial-gradient(circle at 10% 10%, rgba(37, 99, 235, 0.03) 0%, transparent 40%),
        radial-gradient(circle at 90% 20%, rgba(255, 94, 98, 0.03) 0%, transparent 40%),
        radial-gradient(circle at 50% 70%, rgba(6, 182, 212, 0.03) 0%, transparent 50%);
      background-repeat: no-repeat;
    }
    .site-container {
      width: 100%;
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 20px;
    }
    .section-gap {
      padding: 70px 0;
    }
    .text-center {
      text-align: center;
    }
    .section-header {
      margin-bottom: 44px;
      text-align: center;
    }
    .section-tag {
      display: inline-block;
      padding: 4px 14px;
      border-radius: 999px;
      font-size: 0.85rem;
      font-weight: 600;
      letter-spacing: 0.5px;
      margin-bottom: 12px;
      background: rgba(37, 99, 235, 0.08);
      color: var(--primary-color);
      border: 1px solid rgba(37, 99, 235, 0.15);
    }
    .section-title {
      font-size: 2.1rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 14px;
      line-height: 1.3;
    }
    .section-subtitle {
      font-size: 1.05rem;
      color: var(--text-muted);
      max-width: 680px;
      margin: 0 auto;
    }

    /* 顶部导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-light);
      box-shadow: var(--shadow-sm);
    }
    .nav-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .brand-box {
      display: flex;
      align-items: center;
      gap: 12px;
      text-decoration: none;
    }
    .brand-box .ai-page-logo {
      height: 38px;
      width: auto;
      display: block;
    }
    .brand-name {
      font-size: 1.35rem;
      font-weight: 800;
      background: linear-gradient(135deg, #1e3a8a, #2563eb, #ff5e62);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
      list-style: none;
    }
    .nav-links li a {
      text-decoration: none;
      color: var(--text-main);
      font-weight: 500;
      font-size: 0.95rem;
      padding: 8px 12px;
      border-radius: var(--radius-sm);
      transition: all 0.2s ease;
      display: inline-block;
    }
    .nav-links li a:hover {
      color: var(--primary-color);
      background: rgba(37, 99, 235, 0.05);
    }
    .nav-actions {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .btn-nav-primary {
      display: inline-block;
      padding: 8px 18px;
      font-size: 0.9rem;
      font-weight: 600;
      color: #ffffff;
      background: linear-gradient(135deg, #2563eb, #3b82f6);
      border-radius: var(--radius-sm);
      text-decoration: none;
      box-shadow: 0 4px 10px rgba(37, 99, 235, 0.2);
      transition: all 0.2s ease;
    }
    .btn-nav-primary:hover {
      transform: translateY(-1px);
      box-shadow: 0 6px 14px rgba(37, 99, 235, 0.3);
    }
    .menu-toggle {
      display: none;
      background: none;
      border: none;
      cursor: pointer;
      padding: 6px;
    }
    .menu-toggle span {
      display: block;
      width: 24px;
      height: 2px;
      background: var(--text-main);
      margin: 5px 0;
      transition: 0.3s;
    }

    /* Hero 首屏 (无图) */
    .hero-section {
      padding: 80px 0 60px;
      background: linear-gradient(180deg, rgba(37, 99, 235, 0.04) 0%, rgba(255, 255, 255, 0) 100%);
      position: relative;
    }
    .hero-wrapper {
      display: flex;
      flex-direction: column;
      align-items: center;
      text-align: center;
      position: relative;
    }
    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: linear-gradient(90deg, rgba(37, 99, 235, 0.1), rgba(255, 94, 98, 0.1));
      border: 1px solid rgba(37, 99, 235, 0.2);
      padding: 6px 16px;
      border-radius: 30px;
      font-size: 0.88rem;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 24px;
    }
    .hero-badge-dot {
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: var(--accent-coral);
      display: inline-block;
      box-shadow: 0 0 8px var(--accent-coral);
    }
    .hero-title {
      font-size: 2.8rem;
      font-weight: 900;
      line-height: 1.25;
      color: var(--text-main);
      margin-bottom: 20px;
      max-width: 900px;
    }
    .hero-desc {
      font-size: 1.15rem;
      color: var(--text-muted);
      max-width: 760px;
      margin-bottom: 36px;
      line-height: 1.7;
    }
    .hero-actions {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
      justify-content: center;
      margin-bottom: 50px;
    }
    .btn-main-hero {
      padding: 14px 34px;
      font-size: 1.05rem;
      font-weight: 700;
      color: #ffffff;
      background: linear-gradient(135deg, #ff5e62, #ff9966);
      border-radius: var(--radius-md);
      text-decoration: none;
      box-shadow: 0 8px 20px rgba(255, 94, 98, 0.3);
      transition: all 0.25s ease;
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }
    .btn-main-hero:hover {
      transform: translateY(-2px);
      box-shadow: 0 12px 25px rgba(255, 94, 98, 0.4);
    }
    .btn-sub-hero {
      padding: 14px 30px;
      font-size: 1.05rem;
      font-weight: 600;
      color: var(--primary-color);
      background: #ffffff;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      text-decoration: none;
      box-shadow: var(--shadow-sm);
      transition: all 0.25s ease;
    }
    .btn-sub-hero:hover {
      border-color: var(--primary-color);
      background: rgba(37, 99, 235, 0.03);
      transform: translateY(-2px);
    }
    .hero-model-tags {
      background: #ffffff;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-lg);
      padding: 22px 28px;
      box-shadow: var(--shadow-sm);
      max-width: 960px;
      width: 100%;
    }
    .hero-model-tags-title {
      font-size: 0.9rem;
      font-weight: 700;
      color: var(--text-muted);
      text-transform: uppercase;
      margin-bottom: 12px;
      letter-spacing: 0.5px;
    }
    .model-badge-cloud {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 8px;
    }
    .model-badge {
      background: #f1f5f9;
      color: var(--text-main);
      font-size: 0.8rem;
      font-weight: 500;
      padding: 4px 10px;
      border-radius: 6px;
      border: 1px solid #e2e8f0;
      transition: all 0.2s ease;
    }
    .model-badge:hover {
      background: #e2e8f0;
      border-color: #cbd5e1;
    }

    /* 指标看板 */
    .metric-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      margin-top: -30px;
      position: relative;
      z-index: 10;
    }
    .metric-card {
      background: #ffffff;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      padding: 24px 20px;
      box-shadow: var(--shadow-md);
      text-align: center;
      border-top: 4px solid var(--primary-color);
      transition: transform 0.2s;
    }
    .metric-card:nth-child(2) { border-top-color: var(--accent-coral); }
    .metric-card:nth-child(3) { border-top-color: var(--accent-cyan); }
    .metric-card:nth-child(4) { border-top-color: var(--accent-emerald); }
    .metric-card:hover { transform: translateY(-4px); }
    .metric-value {
      font-size: 2.2rem;
      font-weight: 800;
      color: var(--text-main);
      line-height: 1.1;
      margin-bottom: 6px;
    }
    .metric-label {
      font-size: 0.9rem;
      color: var(--text-muted);
      font-weight: 500;
    }

    /* 平台介绍 */
    .platform-intro-card {
      background: #ffffff;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-lg);
      padding: 40px;
      box-shadow: var(--shadow-sm);
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
    }
    .platform-intro-text p {
      color: var(--text-muted);
      margin-bottom: 16px;
      font-size: 1rem;
      line-height: 1.7;
    }
    .platform-feature-list {
      list-style: none;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 14px;
      margin-top: 24px;
    }
    .platform-feature-list li {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 600;
      font-size: 0.95rem;
      color: var(--text-main);
    }
    .feature-icon {
      width: 20px;
      height: 20px;
      background: rgba(37, 99, 235, 0.1);
      color: var(--primary-color);
      border-radius: 50%;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-size: 0.75rem;
    }
    .platform-media-box {
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border-light);
      background: #f1f5f9;
    }
    .platform-media-box img {
      width: 100%;
      height: auto;
      display: block;
      transition: transform 0.3s;
    }
    .platform-media-box:hover img {
      transform: scale(1.02);
    }

    /* 服务能力卡片 */
    .service-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .service-card {
      background: #ffffff;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      padding: 28px 24px;
      box-shadow: var(--shadow-sm);
      transition: all 0.25s ease;
      position: relative;
    }
    .service-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: rgba(37, 99, 235, 0.3);
    }
    .service-badge {
      display: inline-block;
      font-size: 0.75rem;
      font-weight: 700;
      padding: 2px 8px;
      border-radius: 4px;
      margin-bottom: 14px;
    }
    .badge-blue { background: #dbeafe; color: #1e40af; }
    .badge-red { background: #fee2e2; color: #991b1b; }
    .badge-purple { background: #f3e8ff; color: #6b21a8; }
    .badge-amber { background: #fef3c7; color: #92400e; }
    .badge-cyan { background: #cffafe; color: #155e75; }
    .badge-emerald { background: #d1fae5; color: #065f46; }
    .service-card h3 {
      font-size: 1.2rem;
      font-weight: 700;
      margin-bottom: 10px;
      color: var(--text-main);
    }
    .service-card p {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 行业方案展示 */
    .industry-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }
    .industry-card {
      background: #ffffff;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      padding: 26px;
      display: flex;
      flex-direction: column;
      gap: 12px;
      box-shadow: var(--shadow-sm);
    }
    .industry-card h3 {
      font-size: 1.15rem;
      font-weight: 700;
      color: var(--text-main);
      display: flex;
      align-items: center;
      gap: 10px;
    }
    .industry-card h3::before {
      content: "";
      display: inline-block;
      width: 4px;
      height: 16px;
      background: var(--accent-coral);
      border-radius: 2px;
    }
    .industry-card p {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 对比评测 */
    .comparison-wrapper {
      background: #ffffff;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-lg);
      padding: 36px;
      box-shadow: var(--shadow-md);
    }
    .score-banner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 20px;
      background: linear-gradient(135deg, #1e3a8a, #2563eb);
      color: #ffffff;
      padding: 24px 30px;
      border-radius: var(--radius-md);
      margin-bottom: 30px;
    }
    .score-left h4 {
      font-size: 1.3rem;
      font-weight: 800;
      margin-bottom: 4px;
    }
    .score-left p {
      font-size: 0.95rem;
      opacity: 0.9;
    }
    .score-right {
      display: flex;
      align-items: center;
      gap: 18px;
    }
    .score-badge {
      background: rgba(255, 255, 255, 0.2);
      padding: 8px 16px;
      border-radius: var(--radius-sm);
      text-align: center;
    }
    .score-number {
      font-size: 2.2rem;
      font-weight: 900;
      line-height: 1;
      color: #ffeb3b;
    }
    .score-scale {
      font-size: 0.85rem;
      opacity: 0.8;
    }
    .score-stars {
      color: #ffeb3b;
      font-size: 1.2rem;
      letter-spacing: 2px;
    }
    .table-container {
      width: 100%;
      overflow-x: auto;
    }
    .compare-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 680px;
    }
    .compare-table th, .compare-table td {
      padding: 16px 18px;
      border-bottom: 1px solid var(--border-light);
      font-size: 0.92rem;
    }
    .compare-table th {
      background: #f8fafc;
      color: var(--text-main);
      font-weight: 700;
    }
    .compare-table tr:hover td {
      background: rgba(37, 99, 235, 0.02);
    }
    .text-highlight {
      color: var(--primary-color);
      font-weight: 700;
    }

    /* 标准流程时间线 */
    .timeline-grid {
      display: grid;
      grid-template-columns: repeat(5, 1fr);
      gap: 16px;
      position: relative;
    }
    .timeline-step {
      background: #ffffff;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      padding: 22px 18px;
      text-align: center;
      box-shadow: var(--shadow-sm);
      position: relative;
    }
    .step-number {
      width: 36px;
      height: 36px;
      line-height: 36px;
      border-radius: 50%;
      background: var(--primary-color);
      color: #ffffff;
      font-weight: 800;
      margin: 0 auto 12px;
    }
    .timeline-step:nth-child(2) .step-number { background: var(--accent-coral); }
    .timeline-step:nth-child(3) .step-number { background: var(--accent-cyan); }
    .timeline-step:nth-child(4) .step-number { background: var(--accent-amber); }
    .timeline-step:nth-child(5) .step-number { background: var(--accent-emerald); }
    .timeline-step h4 {
      font-size: 1rem;
      font-weight: 700;
      margin-bottom: 6px;
    }
    .timeline-step p {
      font-size: 0.85rem;
      color: var(--text-muted);
    }

    /* 案例中心 */
    .case-gallery {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .case-item {
      background: #ffffff;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: all 0.25s ease;
    }
    .case-item:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }
    .case-img-wrap {
      width: 100%;
      aspect-ratio: 16 / 10;
      background: #f1f5f9;
      overflow: hidden;
    }
    .case-img-wrap img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      display: block;
      transition: transform 0.3s;
    }
    .case-item:hover .case-img-wrap img {
      transform: scale(1.05);
    }
    .case-info {
      padding: 16px;
    }
    .case-info h4 {
      font-size: 1rem;
      font-weight: 700;
      margin-bottom: 4px;
    }
    .case-info p {
      font-size: 0.85rem;
      color: var(--text-muted);
    }

    /* 用户评论 */
    .reviews-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 22px;
    }
    .review-card {
      background: #ffffff;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .review-rating {
      color: #f59e0b;
      margin-bottom: 12px;
      font-size: 0.9rem;
    }
    .review-comment {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 16px;
    }
    .reviewer-meta {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid var(--border-light);
      padding-top: 12px;
    }
    .reviewer-avatar {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      background: linear-gradient(135deg, #2563eb, #ff5e62);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 0.9rem;
    }
    .reviewer-details h5 {
      font-size: 0.95rem;
      font-weight: 700;
      color: var(--text-main);
    }
    .reviewer-details span {
      font-size: 0.8rem;
      color: var(--text-muted);
    }

    /* FAQ 折叠面板 */
    .faq-list {
      max-width: 900px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }
    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: all 0.2s ease;
    }
    .faq-question {
      padding: 18px 22px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      font-weight: 700;
      font-size: 1rem;
      color: var(--text-main);
      user-select: none;
    }
    .faq-icon {
      font-size: 1.2rem;
      transition: transform 0.25s ease;
      color: var(--primary-color);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      background: #f8fafc;
      color: var(--text-muted);
      font-size: 0.93rem;
      line-height: 1.7;
      padding: 0 22px;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 14px 22px 20px;
      border-top: 1px solid var(--border-light);
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }

    /* 表单与需求匹配 */
    .form-section-wrapper {
      background: #ffffff;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-lg);
      padding: 40px;
      box-shadow: var(--shadow-md);
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
    }
    .form-info-side h3 {
      font-size: 1.6rem;
      font-weight: 800;
      margin-bottom: 12px;
    }
    .form-info-side p {
      color: var(--text-muted);
      font-size: 0.95rem;
      line-height: 1.7;
      margin-bottom: 24px;
    }
    .contact-card-list {
      display: flex;
      flex-direction: column;
      gap: 14px;
    }
    .contact-card-item {
      display: flex;
      align-items: center;
      gap: 12px;
      padding: 12px 16px;
      background: #f8fafc;
      border-radius: var(--radius-sm);
      border: 1px solid var(--border-light);
      font-size: 0.92rem;
    }
    .qr-container {
      margin-top: 18px;
      display: flex;
      align-items: center;
      gap: 16px;
      background: #f8fafc;
      padding: 14px;
      border-radius: var(--radius-sm);
      border: 1px solid var(--border-light);
    }
    .qr-container img {
      width: 80px;
      height: 80px;
      display: block;
      border-radius: 4px;
    }
    .qr-text h5 {
      font-size: 0.95rem;
      margin-bottom: 4px;
    }
    .qr-text p {
      font-size: 0.8rem;
      color: var(--text-muted);
      margin-bottom: 0;
    }
    .lead-form {
      display: flex;
      flex-direction: column;
      gap: 16px;
    }
    .form-group {
      display: flex;
      flex-direction: column;
      gap: 6px;
    }
    .form-group label {
      font-size: 0.88rem;
      font-weight: 600;
      color: var(--text-main);
    }
    .form-input, .form-select, .form-textarea {
      width: 100%;
      padding: 12px 14px;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-sm);
      font-size: 0.92rem;
      color: var(--text-main);
      background: #ffffff;
      outline: none;
      transition: border-color 0.2s;
    }
    .form-input:focus, .form-select:focus, .form-textarea:focus {
      border-color: var(--primary-color);
      box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
    }
    .form-textarea {
      resize: vertical;
      min-height: 100px;
    }
    .btn-form-submit {
      padding: 14px;
      font-size: 1rem;
      font-weight: 700;
      color: #ffffff;
      background: linear-gradient(135deg, #2563eb, #1d4ed8);
      border: none;
      border-radius: var(--radius-sm);
      cursor: pointer;
      box-shadow: 0 4px 12px rgba(37, 99, 235, 0.25);
      transition: all 0.2s;
    }
    .btn-form-submit:hover {
      background: linear-gradient(135deg, #1d4ed8, #1e40af);
      transform: translateY(-1px);
    }

    /* 资讯与动态 */
    .article-section-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
    }
    .article-card {
      background: #ffffff;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--shadow-sm);
    }
    .article-card h4 {
      font-size: 1.15rem;
      margin-bottom: 12px;
    }
    .article-card p {
      font-size: 0.92rem;
      color: var(--text-muted);
      margin-bottom: 16px;
    }
    .article-link-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 8px;
    }
    .article-link-list li a {
      color: var(--primary-color);
      text-decoration: none;
      font-size: 0.9rem;
      font-weight: 500;
    }
    .article-link-list li a:hover {
      text-decoration: underline;
    }

    /* 友情链接与生态 */
    .friend-links-box {
      background: #ffffff;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      padding: 20px 24px;
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 14px;
      margin-top: 30px;
    }
    .friend-links-title {
      font-weight: 700;
      font-size: 0.9rem;
      color: var(--text-main);
      margin-right: 8px;
    }
    .friend-links-box a {
      color: var(--text-muted);
      text-decoration: none;
      font-size: 0.88rem;
      transition: color 0.2s;
    }
    .friend-links-box a:hover {
      color: var(--primary-color);
    }

    /* 统一页脚 */
    .site-footer {
      background: #0f172a;
      color: #94a3b8;
      padding: 50px 0 24px;
      border-top: 1px solid #1e293b;
    }
    .footer-content {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 30px;
      margin-bottom: 40px;
    }
    .footer-col h4 {
      color: #ffffff;
      font-size: 1rem;
      font-weight: 700;
      margin-bottom: 16px;
    }
    .footer-col p {
      font-size: 0.88rem;
      line-height: 1.6;
      margin-bottom: 12px;
    }
    .footer-col ul {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 8px;
    }
    .footer-col ul li a {
      color: #94a3b8;
      text-decoration: none;
      font-size: 0.88rem;
      transition: color 0.2s;
    }
    .footer-col ul li a:hover {
      color: #ffffff;
    }
    .footer-bottom {
      border-top: 1px solid #1e293b;
      padding-top: 20px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 12px;
      font-size: 0.85rem;
    }
    .footer-bottom a {
      color: #94a3b8;
      text-decoration: none;
    }
    .footer-bottom a:hover {
      color: #ffffff;
    }

    /* 悬浮客服与返回顶部 */
    .floating-widget {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .float-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: #ffffff;
      box-shadow: var(--shadow-md);
      display: flex;
      align-items: center;
      justify-content: center;
      border: 1px solid var(--border-light);
      cursor: pointer;
      text-decoration: none;
      color: var(--text-main);
      font-size: 1.1rem;
      transition: all 0.2s;
    }
    .float-btn:hover {
      transform: scale(1.08);
      border-color: var(--primary-color);
      color: var(--primary-color);
    }
    .float-qr-panel {
      position: absolute;
      right: 60px;
      bottom: 0;
      background: #ffffff;
      padding: 12px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-lg);
      border: 1px solid var(--border-light);
      display: none;
      width: 140px;
      text-align: center;
    }
    .float-qr-panel img {
      width: 100%;
      height: auto;
      display: block;
      border-radius: 4px;
    }
    .float-qr-panel span {
      font-size: 0.75rem;
      color: var(--text-muted);
      margin-top: 6px;
      display: block;
    }
    .float-kefu:hover .float-qr-panel {
      display: block;
    }

    /* 响应式样式适配 */
    @media (max-width: 1024px) {
      .service-grid { grid-template-columns: repeat(2, 1fr); }
      .case-gallery { grid-template-columns: repeat(2, 1fr); }
      .timeline-grid { grid-template-columns: repeat(3, 1fr); }
      .metric-grid { grid-template-columns: repeat(2, 1fr); }
      .reviews-grid { grid-template-columns: repeat(2, 1fr); }
      .footer-content { grid-template-columns: 1fr 1fr; }
    }

    @media (max-width: 768px) {
      .menu-toggle { display: block; }
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #ffffff;
        flex-direction: column;
        padding: 16px;
        border-bottom: 1px solid var(--border-light);
        box-shadow: var(--shadow-md);
      }
      .nav-links.active { display: flex; }
      .nav-links li { width: 100%; text-align: center; }
      .nav-links li a { display: block; padding: 12px; }
      .hero-title { font-size: 1.95rem; }
      .platform-intro-card { grid-template-columns: 1fr; }
      .service-grid { grid-template-columns: 1fr; }
      .industry-grid { grid-template-columns: 1fr; }
      .timeline-grid { grid-template-columns: 1fr; }
      .case-gallery { grid-template-columns: 1fr; }
      .reviews-grid { grid-template-columns: 1fr; }
      .form-section-wrapper { grid-template-columns: 1fr; }
      .article-section-grid { grid-template-columns: 1fr; }
      .footer-content { grid-template-columns: 1fr; }
      .score-banner { flex-direction: column; text-align: center; }
      .score-right { justify-content: center; }
    }