:root {
      --primary-navy: #0b2265;
      --primary-blue: #1d4ed8;
      --royal-blue: #2563eb;
      --bright-blue: #3b82f6;
      --soft-blue: #dbeafe;
      --accent-cyan: #0284c7;
      --bg-light: #f8fafc;
      --bg-card: #ffffff;
      --border-color: #e2e8f0;
      --text-main: #0f172a;
      --text-sub: #475569;
      --text-light: #64748b;
      --container-max: 1200px;
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.05);
      --shadow-md: 0 4px 20px -2px rgba(29, 78, 216, 0.08);
      --shadow-lg: 0 10px 30px -4px rgba(29, 78, 216, 0.12);
      --radius-sm: 6px;
      --radius-md: 10px;
      --radius-lg: 16px;
      --transition: all 0.28s ease;
    }

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-light);
      color: var(--text-main);
      line-height: 1.65;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

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

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

    /* 顶部导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(10px);
      border-bottom: 1px solid var(--border-color);
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .brand-group {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .brand-group .ai-page-logo {
      height: 38px;
      width: auto;
      display: block;
    }
    .brand-title {
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--primary-navy);
      letter-spacing: -0.5px;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
      list-style: none;
    }
    .nav-links li a {
      display: block;
      padding: 10px 14px;
      font-size: 0.92rem;
      font-weight: 500;
      color: var(--text-sub);
    }
    .nav-links li a:hover,
    .nav-links li a.active {
      color: var(--royal-blue);
    }

    .header-cta-group {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 9px 20px;
      font-size: 0.9rem;
      font-weight: 600;
      border-radius: var(--radius-sm);
      cursor: pointer;
      transition: var(--transition);
      border: 1px solid transparent;
      text-align: center;
    }
    .btn-primary {
      background: var(--royal-blue);
      color: #ffffff;
      box-shadow: 0 4px 12px rgba(37, 99, 235, 0.25);
    }
    .btn-primary:hover {
      background: var(--primary-blue);
      transform: translateY(-1px);
      box-shadow: 0 6px 16px rgba(37, 99, 235, 0.35);
      color: #ffffff;
    }
    .btn-outline {
      border-color: var(--royal-blue);
      color: var(--royal-blue);
      background: #ffffff;
    }
    .btn-outline:hover {
      background: var(--soft-blue);
      color: var(--primary-navy);
    }
    .btn-lg {
      padding: 14px 32px;
      font-size: 1.05rem;
      border-radius: var(--radius-md);
    }
    .nav-toggle {
      display: none;
      background: none;
      border: none;
      cursor: pointer;
      padding: 6px;
    }
    .nav-toggle span {
      display: block;
      width: 24px;
      height: 2px;
      background: var(--text-main);
      margin: 5px 0;
      transition: var(--transition);
    }

    /* 区域通用规范 */
    .section-wrap {
      padding: 80px 0;
      border-bottom: 1px solid var(--border-color);
      background: #ffffff;
    }
    .section-wrap:nth-of-type(even) {
      background: var(--bg-light);
    }
    .section-header {
      text-align: center;
      max-width: 800px;
      margin: 0 auto 50px auto;
    }
    .section-tag {
      display: inline-block;
      font-size: 0.8rem;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 1px;
      color: var(--royal-blue);
      background: var(--soft-blue);
      padding: 4px 14px;
      border-radius: 20px;
      margin-bottom: 14px;
    }
    .section-title {
      font-size: 2.1rem;
      font-weight: 700;
      color: var(--primary-navy);
      line-height: 1.3;
      margin-bottom: 14px;
    }
    .section-desc {
      font-size: 1.02rem;
      color: var(--text-sub);
      line-height: 1.6;
    }

    /* 首屏 HERO (严禁图片) */
    .hero-section {
      background: linear-gradient(175deg, #eff6ff 0%, #f8fafc 60%, #ffffff 100%);
      padding: 90px 0 70px 0;
      position: relative;
      border-bottom: 1px solid var(--border-color);
      text-align: center;
    }
    .hero-badge-wrap {
      margin-bottom: 24px;
    }
    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 16px;
      background: #ffffff;
      border: 1px solid #bfdbfe;
      border-radius: 30px;
      font-size: 0.88rem;
      font-weight: 600;
      color: var(--royal-blue);
      box-shadow: var(--shadow-sm);
    }
    .hero-badge-pulse {
      width: 8px;
      height: 8px;
      background: #10b981;
      border-radius: 50%;
      box-shadow: 0 0 0 4px rgba(16, 185, 129, 0.2);
    }
    .hero-title {
      font-size: 2.75rem;
      font-weight: 800;
      color: var(--primary-navy);
      line-height: 1.25;
      margin: 0 auto 20px auto;
      max-width: 900px;
      letter-spacing: -0.8px;
    }
    .hero-subtitle {
      font-size: 1.15rem;
      color: var(--text-sub);
      max-width: 760px;
      margin: 0 auto 36px auto;
      line-height: 1.7;
    }
    .hero-actions {
      display: flex;
      justify-content: center;
      align-items: center;
      gap: 16px;
      margin-bottom: 48px;
      flex-wrap: wrap;
    }
    .hero-models-pill-bar {
      margin: 0 auto 40px auto;
      max-width: 980px;
      padding: 16px 20px;
      background: #ffffff;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }
    .hero-pill-desc {
      font-size: 0.85rem;
      color: var(--text-light);
      margin-bottom: 10px;
      font-weight: 600;
    }
    .pill-cloud {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 8px;
    }
    .pill-item {
      font-size: 0.78rem;
      font-weight: 600;
      padding: 4px 10px;
      border-radius: 4px;
      background: #f1f5f9;
      color: var(--primary-navy);
      border: 1px solid #e2e8f0;
    }
    .pill-item.hot {
      background: var(--soft-blue);
      color: var(--royal-blue);
      border-color: #bfdbfe;
    }
    .hero-metrics {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      max-width: 1000px;
      margin: 0 auto;
    }
    .metric-card {
      background: #ffffff;
      padding: 24px 16px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      text-align: center;
    }
    .metric-number {
      font-size: 2.1rem;
      font-weight: 800;
      color: var(--royal-blue);
      line-height: 1.1;
      margin-bottom: 6px;
    }
    .metric-label {
      font-size: 0.88rem;
      color: var(--text-sub);
      font-weight: 500;
    }

    /* 网格布局通用 */
    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 30px;
    }
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }

    /* 关于我们与平台能力 */
    .about-card {
      background: #ffffff;
      padding: 32px;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-md);
    }
    .about-card h3 {
      font-size: 1.45rem;
      color: var(--primary-navy);
      margin-bottom: 14px;
    }
    .about-card p {
      color: var(--text-sub);
      font-size: 0.98rem;
      margin-bottom: 18px;
    }
    .about-feature-list {
      list-style: none;
    }
    .about-feature-list li {
      position: relative;
      padding-left: 24px;
      margin-bottom: 12px;
      font-size: 0.94rem;
      color: var(--text-main);
      font-weight: 500;
    }
    .about-feature-list li::before {
      content: "✓";
      position: absolute;
      left: 0;
      top: 0;
      color: var(--royal-blue);
      font-weight: 800;
    }

    /* 卡片组件 */
    .card-item {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      transition: var(--transition);
      display: flex;
      flex-direction: column;
      justify-content: flex-start;
      box-shadow: var(--shadow-sm);
    }
    .card-item:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-lg);
      border-color: #bfdbfe;
    }
    .card-icon {
      width: 46px;
      height: 46px;
      border-radius: 8px;
      background: var(--soft-blue);
      color: var(--royal-blue);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1.15rem;
      margin-bottom: 16px;
    }
    .card-title {
      font-size: 1.15rem;
      font-weight: 700;
      color: var(--primary-navy);
      margin-bottom: 10px;
    }
    .card-text {
      font-size: 0.9rem;
      color: var(--text-sub);
      line-height: 1.6;
    }

    /* 流程步骤 */
    .timeline-steps {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      position: relative;
    }
    .step-box {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px 20px;
      position: relative;
    }
    .step-num {
      width: 32px;
      height: 32px;
      background: var(--primary-navy);
      color: #ffffff;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 0.85rem;
      font-weight: 700;
      margin-bottom: 14px;
    }
    .step-box h4 {
      font-size: 1.05rem;
      color: var(--primary-navy);
      margin-bottom: 8px;
    }
    .step-box p {
      font-size: 0.88rem;
      color: var(--text-sub);
    }

    /* 对比评测高亮板块 */
    .eval-highlight-box {
      background: linear-gradient(135deg, #0b2265 0%, #1e40af 100%);
      color: #ffffff;
      border-radius: var(--radius-lg);
      padding: 40px;
      margin-bottom: 40px;
      box-shadow: var(--shadow-lg);
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 24px;
    }
    .eval-score-area {
      display: flex;
      align-items: center;
      gap: 20px;
    }
    .eval-score-circle {
      width: 100px;
      height: 100px;
      border-radius: 50%;
      border: 4px solid #60a5fa;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      background: rgba(255, 255, 255, 0.08);
    }
    .eval-num {
      font-size: 2.2rem;
      font-weight: 800;
      color: #ffffff;
      line-height: 1;
    }
    .eval-max {
      font-size: 0.75rem;
      color: #bfdbfe;
    }
    .eval-meta h3 {
      font-size: 1.6rem;
      color: #ffffff;
      margin-bottom: 6px;
    }
    .eval-stars {
      color: #f59e0b;
      font-size: 1.25rem;
      margin-bottom: 6px;
    }
    .eval-meta p {
      font-size: 0.95rem;
      color: #dbeafe;
    }

    .table-container {
      width: 100%;
      overflow-x: auto;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
    }
    .custom-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      font-size: 0.92rem;
    }
    .custom-table th, 
    .custom-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
    }
    .custom-table th {
      background: #f1f5f9;
      color: var(--primary-navy);
      font-weight: 700;
    }
    .custom-table tr:last-child td {
      border-bottom: none;
    }
    .custom-table .col-spec {
      font-weight: 600;
      color: var(--text-main);
    }
    .custom-table .col-prime {
      background: #eff6ff;
      color: var(--royal-blue);
      font-weight: 700;
    }

    /* 案例中心 */
    .case-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }
    .case-img-wrap {
      width: 100%;
      position: relative;
      background: #f1f5f9;
      aspect-ratio: 16/9;
      overflow: hidden;
    }
    .case-img-wrap.square {
      aspect-ratio: 1/1;
    }
    .case-img-wrap img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      display: block;
      transition: var(--transition);
    }
    .case-card:hover .case-img-wrap img {
      transform: scale(1.03);
    }
    .case-body {
      padding: 20px;
    }
    .case-tag {
      font-size: 0.75rem;
      font-weight: 700;
      color: var(--royal-blue);
      margin-bottom: 6px;
      display: inline-block;
    }
    .case-title {
      font-size: 1.1rem;
      color: var(--primary-navy);
      font-weight: 700;
      margin-bottom: 8px;
    }
    .case-desc {
      font-size: 0.88rem;
      color: var(--text-sub);
    }

    /* 客户评价板块 (6条) */
    .review-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .review-card {
      background: #ffffff;
      padding: 26px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .review-stars {
      color: #f59e0b;
      margin-bottom: 12px;
      font-size: 0.95rem;
    }
    .review-quote {
      font-size: 0.92rem;
      color: var(--text-main);
      line-height: 1.65;
      margin-bottom: 20px;
      font-style: normal;
    }
    .review-author {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid #f1f5f9;
      padding-top: 14px;
    }
    .review-avatar {
      width: 42px;
      height: 42px;
      border-radius: 50%;
      background: var(--soft-blue);
      color: var(--royal-blue);
      font-weight: 700;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 0.95rem;
    }
    .author-info h5 {
      font-size: 0.94rem;
      color: var(--primary-navy);
      margin-bottom: 2px;
    }
    .author-info span {
      font-size: 0.78rem;
      color: var(--text-light);
    }

    /* FAQ 常见问题折叠面板 */
    .faq-wrapper {
      max-width: 900px;
      margin: 0 auto;
    }
    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      margin-bottom: 14px;
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }
    .faq-question {
      width: 100%;
      text-align: left;
      padding: 18px 24px;
      background: #ffffff;
      border: none;
      font-size: 1.02rem;
      font-weight: 600;
      color: var(--primary-navy);
      display: flex;
      align-items: center;
      justify-content: space-between;
      cursor: pointer;
      transition: var(--transition);
    }
    .faq-question:hover {
      background: #f8fafc;
      color: var(--royal-blue);
    }
    .faq-icon {
      font-size: 1.25rem;
      font-weight: 400;
      color: var(--royal-blue);
      transition: var(--transition);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease-out;
      background: #fafafa;
      border-top: 1px solid transparent;
    }
    .faq-answer-inner {
      padding: 18px 24px;
      font-size: 0.93rem;
      color: var(--text-sub);
      line-height: 1.7;
    }
    .faq-item.active .faq-answer {
      border-top-color: var(--border-color);
      max-height: 350px;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }

    /* 需求表单与联系我们 */
    .contact-container {
      display: grid;
      grid-template-columns: 1fr 1.3fr;
      gap: 36px;
      background: #ffffff;
      padding: 40px;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-md);
    }
    .contact-info-col h3 {
      font-size: 1.6rem;
      color: var(--primary-navy);
      margin-bottom: 16px;
    }
    .contact-info-col p {
      color: var(--text-sub);
      font-size: 0.95rem;
      margin-bottom: 24px;
    }
    .contact-meta-list {
      list-style: none;
      margin-bottom: 30px;
    }
    .contact-meta-list li {
      margin-bottom: 12px;
      font-size: 0.92rem;
      color: var(--text-main);
      display: flex;
      align-items: center;
      gap: 10px;
    }
    .qr-card {
      padding: 16px;
      background: var(--bg-light);
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      display: inline-block;
      text-align: center;
    }
    .qr-card img {
      width: 140px;
      height: 140px;
      object-fit: contain;
      margin-bottom: 8px;
      display: block;
    }
    .qr-label {
      font-size: 0.8rem;
      color: var(--text-sub);
      font-weight: 600;
    }

    .form-group {
      margin-bottom: 18px;
    }
    .form-label {
      display: block;
      font-size: 0.88rem;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 6px;
    }
    .form-control {
      width: 100%;
      padding: 12px 16px;
      font-size: 0.92rem;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      background: #ffffff;
      color: var(--text-main);
      outline: none;
      transition: var(--transition);
      font-family: inherit;
    }
    .form-control:focus {
      border-color: var(--royal-blue);
      box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
    }
    textarea.form-control {
      resize: vertical;
      min-height: 110px;
    }

    /* 行业资讯文章列表 */
    .article-links-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--shadow-sm);
    }
    .article-ul {
      list-style: none;
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 16px;
    }
    .article-ul li a {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 12px 16px;
      background: var(--bg-light);
      border-radius: var(--radius-sm);
      font-size: 0.92rem;
      color: var(--primary-navy);
      font-weight: 500;
      border: 1px solid #e2e8f0;
    }
    .article-ul li a:hover {
      background: var(--soft-blue);
      color: var(--royal-blue);
      border-color: #bfdbfe;
    }

    /* 页脚设计 */
    .site-footer {
      background: #0b193d;
      color: #94a3b8;
      padding: 60px 0 24px 0;
      border-top: 1px solid #1e293b;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 40px;
      margin-bottom: 40px;
    }
    .footer-col h4 {
      color: #ffffff;
      font-size: 1.05rem;
      margin-bottom: 18px;
      font-weight: 600;
    }
    .footer-links-list {
      list-style: none;
    }
    .footer-links-list li {
      margin-bottom: 10px;
    }
    .footer-links-list li a {
      color: #94a3b8;
      font-size: 0.88rem;
    }
    .footer-links-list li a:hover {
      color: #ffffff;
    }
    .footer-brand p {
      font-size: 0.88rem;
      line-height: 1.6;
      margin-bottom: 16px;
      color: #cbd5e1;
    }
    .footer-friend-links {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      margin-top: 10px;
    }
    .footer-friend-links a {
      display: inline-block;
      font-size: 0.82rem;
      padding: 3px 8px;
      background: rgba(255, 255, 255, 0.06);
      border-radius: 4px;
      color: #cbd5e1;
    }
    .footer-friend-links a:hover {
      color: #ffffff;
      background: var(--royal-blue);
    }
    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.1);
      padding-top: 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 0.82rem;
      color: #64748b;
      flex-wrap: wrap;
      gap: 12px;
    }
    .footer-bottom a {
      color: #94a3b8;
    }
    .footer-bottom a:hover {
      color: #ffffff;
    }

    /* 浮动组件与返回顶部 */
    .floating-widget {
      position: fixed;
      right: 20px;
      bottom: 24px;
      display: flex;
      flex-direction: column;
      gap: 10px;
      z-index: 999;
    }
    .float-btn {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: var(--royal-blue);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 0.85rem;
      font-weight: 700;
      box-shadow: 0 4px 14px rgba(37, 99, 235, 0.35);
      cursor: pointer;
      border: none;
      transition: var(--transition);
    }
    .float-btn:hover {
      background: var(--primary-navy);
      transform: scale(1.05);
    }

    /* 响应式调整 */
    @media (max-width: 992px) {
      .hero-title {
        font-size: 2.2rem;
      }
      .grid-4 {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
      .hero-metrics {
        grid-template-columns: repeat(2, 1fr);
      }
      .timeline-steps {
        grid-template-columns: repeat(2, 1fr);
      }
      .review-grid {
        grid-template-columns: 1fr;
      }
      .contact-container {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #ffffff;
        flex-direction: column;
        padding: 16px 20px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-md);
      }
      .nav-links.show {
        display: flex;
      }
      .nav-toggle {
        display: block;
      }
    }

    @media (max-width: 640px) {
      .hero-title {
        font-size: 1.8rem;
      }
      .section-title {
        font-size: 1.6rem;
      }
      .grid-2, .grid-3, .grid-4 {
        grid-template-columns: 1fr;
      }
      .hero-metrics {
        grid-template-columns: 1fr;
      }
      .timeline-steps {
        grid-template-columns: 1fr;
      }
      .article-ul {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .eval-highlight-box {
        padding: 24px;
        flex-direction: column;
        align-items: flex-start;
      }
    }