:root {
      --primary-blue: #0b57d0;
      --vibrant-blue: #1a73e8;
      --royal-blue: #0842a0;
      --accent-cyan: #00d2ff;
      --accent-gold: #f59e0b;
      --dark-navy: #0f172a;
      --text-main: #1e293b;
      --text-muted: #64748b;
      --bg-light: #f8fafc;
      --bg-white: #ffffff;
      --card-border: #e2e8f0;
      --shadow-sm: 0 2px 4px rgba(11, 87, 208, 0.04);
      --shadow-md: 0 10px 25px -5px rgba(11, 87, 208, 0.08), 0 8px 10px -6px rgba(11, 87, 208, 0.04);
      --shadow-lg: 0 20px 30px -10px rgba(11, 87, 208, 0.15);
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    }

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
      -webkit-tap-highlight-color: transparent;
    }

    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-light);
      color: var(--text-main);
      line-height: 1.6;
      overflow-x: hidden;
    }

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

    ul, ol {
      list-style: none;
    }

    .site-container {
      width: 100%;
      max-width: 1240px;
      margin: 0 auto;
      padding: 0 24px;
    }

    .section-wrap {
      padding: 80px 0;
      position: relative;
    }

    .section-header {
      text-align: center;
      max-width: 780px;
      margin: 0 auto 50px;
    }

    .section-tag {
      display: inline-block;
      padding: 6px 14px;
      background-color: rgba(26, 115, 232, 0.1);
      color: var(--primary-blue);
      font-size: 0.875rem;
      font-weight: 600;
      border-radius: 30px;
      margin-bottom: 12px;
      letter-spacing: 0.5px;
    }

    .section-title {
      font-size: 2.1rem;
      font-weight: 700;
      color: var(--dark-navy);
      line-height: 1.3;
      margin-bottom: 16px;
    }

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

    /* 顶部导航 */
    .header-nav {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(226, 232, 240, 0.8);
      box-shadow: 0 2px 10px rgba(0, 0, 0, 0.03);
    }

    .nav-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }

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

    .brand-logo .ai-page-logo {
      max-height: 42px;
      width: auto;
      display: block;
    }

    .brand-title {
      font-size: 1.35rem;
      font-weight: 800;
      color: var(--primary-blue);
      letter-spacing: -0.5px;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
    }

    .nav-links a {
      display: inline-block;
      padding: 8px 14px;
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--text-main);
      border-radius: var(--radius-sm);
    }

    .nav-links a:hover {
      color: var(--primary-blue);
      background-color: rgba(26, 115, 232, 0.06);
    }

    .nav-cta {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .btn-primary {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      background: linear-gradient(135deg, var(--vibrant-blue), var(--primary-blue));
      color: #ffffff;
      font-weight: 600;
      border-radius: var(--radius-sm);
      border: 1px solid transparent;
      box-shadow: 0 4px 12px rgba(11, 87, 208, 0.25);
      transition: var(--transition);
      cursor: pointer;
    }

    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 18px rgba(11, 87, 208, 0.35);
      color: #ffffff;
    }

    .btn-secondary {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 20px;
      background-color: #ffffff;
      color: var(--primary-blue);
      font-weight: 600;
      border-radius: var(--radius-sm);
      border: 1px solid rgba(26, 115, 232, 0.3);
      transition: var(--transition);
      cursor: pointer;
    }

    .btn-secondary:hover {
      background-color: rgba(26, 115, 232, 0.05);
      border-color: var(--primary-blue);
    }

    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      font-size: 1.5rem;
      color: var(--dark-navy);
      cursor: pointer;
      padding: 4px;
    }

    /* 首屏 Hero */
    .hero-section {
      padding: 70px 0 60px;
      background: radial-gradient(circle at top right, rgba(0, 210, 255, 0.08), transparent 45%),
                  radial-gradient(circle at bottom left, rgba(11, 87, 208, 0.06), transparent 50%),
                  #ffffff;
      border-bottom: 1px solid var(--card-border);
      position: relative;
    }

    .hero-content {
      text-align: center;
      max-width: 920px;
      margin: 0 auto;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 18px;
      background: linear-gradient(90deg, rgba(26, 115, 232, 0.1), rgba(0, 210, 255, 0.15));
      border: 1px solid rgba(26, 115, 232, 0.2);
      border-radius: 30px;
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--royal-blue);
      margin-bottom: 24px;
    }

    .hero-title {
      font-size: 2.8rem;
      font-weight: 800;
      color: var(--dark-navy);
      line-height: 1.25;
      letter-spacing: -0.5px;
      margin-bottom: 20px;
    }

    .hero-title .highlight {
      background: linear-gradient(135deg, var(--vibrant-blue), var(--royal-blue));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

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

    .hero-actions {
      display: flex;
      justify-content: center;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 45px;
    }

    .btn-hero-official {
      padding: 14px 34px;
      font-size: 1.05rem;
      border-radius: var(--radius-sm);
      background: linear-gradient(135deg, #0b57d0, #0070f3);
      color: #ffffff;
      font-weight: 700;
      box-shadow: 0 8px 20px rgba(11, 87, 208, 0.35);
      border: none;
      display: inline-flex;
      align-items: center;
      gap: 8px;
      transition: var(--transition);
    }

    .btn-hero-official:hover {
      transform: translateY(-2px) scale(1.02);
      box-shadow: 0 12px 26px rgba(11, 87, 208, 0.45);
      color: #ffffff;
    }

    .hero-stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      margin-top: 20px;
    }

    .stat-card {
      background: #ffffff;
      border: 1px solid var(--card-border);
      padding: 22px 16px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }

    .stat-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: rgba(26, 115, 232, 0.4);
    }

    .stat-value {
      font-size: 1.85rem;
      font-weight: 800;
      color: var(--primary-blue);
      margin-bottom: 4px;
      line-height: 1.2;
    }

    .stat-label {
      font-size: 0.9rem;
      color: var(--text-muted);
      font-weight: 500;
    }

    /* 品牌模型矩阵 */
    .models-bar-section {
      background: #ffffff;
      padding: 30px 0;
      border-bottom: 1px solid var(--card-border);
    }

    .models-title {
      text-align: center;
      font-size: 0.95rem;
      font-weight: 600;
      color: var(--text-muted);
      margin-bottom: 18px;
      letter-spacing: 0.5px;
    }

    .models-pills-wrap {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 10px;
    }

    .model-pill {
      background-color: var(--bg-light);
      border: 1px solid var(--card-border);
      padding: 6px 14px;
      border-radius: 20px;
      font-size: 0.85rem;
      font-weight: 600;
      color: var(--dark-navy);
      transition: var(--transition);
    }

    .model-pill:hover {
      border-color: var(--vibrant-blue);
      background-color: rgba(26, 115, 232, 0.08);
      color: var(--primary-blue);
    }

    /* 卡片与网格体系 */
    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 28px;
    }

    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }

    .feature-card {
      background: #ffffff;
      border: 1px solid var(--card-border);
      border-radius: var(--radius-md);
      padding: 28px 24px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .feature-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-lg);
      border-color: rgba(26, 115, 232, 0.4);
    }

    .card-icon-box {
      width: 48px;
      height: 48px;
      border-radius: 12px;
      background: linear-gradient(135deg, rgba(26, 115, 232, 0.12), rgba(0, 210, 255, 0.15));
      color: var(--primary-blue);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1.25rem;
      margin-bottom: 20px;
    }

    .card-title {
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--dark-navy);
      margin-bottom: 12px;
      line-height: 1.35;
    }

    .card-desc {
      font-size: 0.95rem;
      color: var(--text-muted);
      line-height: 1.65;
      margin-bottom: 16px;
      flex-grow: 1;
    }

    .card-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 6px;
      margin-top: auto;
    }

    .tag-item {
      font-size: 0.75rem;
      background: var(--bg-light);
      color: var(--text-muted);
      padding: 3px 8px;
      border-radius: 4px;
      font-weight: 500;
    }

    /* 对比评测特别组件 */
    .review-score-banner {
      background: linear-gradient(135deg, #0b57d0, #0842a0);
      color: #ffffff;
      border-radius: var(--radius-md);
      padding: 36px;
      margin-bottom: 36px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 24px;
      box-shadow: 0 12px 30px rgba(11, 87, 208, 0.25);
    }

    .score-left h3 {
      font-size: 1.6rem;
      font-weight: 700;
      margin-bottom: 8px;
    }

    .score-left p {
      color: rgba(255, 255, 255, 0.85);
      font-size: 0.95rem;
    }

    .score-right {
      display: flex;
      align-items: center;
      gap: 20px;
    }

    .score-big {
      font-size: 3.6rem;
      font-weight: 900;
      line-height: 1;
      color: #ffd166;
    }

    .score-stars {
      color: #ffd166;
      font-size: 1.3rem;
      letter-spacing: 2px;
    }

    .comparison-table-wrap {
      overflow-x: auto;
      background: #ffffff;
      border: 1px solid var(--card-border);
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
    }

    .comparison-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 650px;
    }

    .comparison-table th, .comparison-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--card-border);
      font-size: 0.95rem;
    }

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

    .comparison-table tr:last-child td {
      border-bottom: none;
    }

    .comparison-table td.highlight-col {
      background-color: rgba(26, 115, 232, 0.04);
      font-weight: 600;
      color: var(--primary-blue);
    }

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

    .step-card {
      background: #ffffff;
      border: 1px solid var(--card-border);
      border-radius: var(--radius-md);
      padding: 28px 20px;
      position: relative;
    }

    .step-number {
      font-size: 2rem;
      font-weight: 900;
      color: rgba(26, 115, 232, 0.2);
      line-height: 1;
      margin-bottom: 12px;
    }

    .step-title {
      font-size: 1.15rem;
      font-weight: 700;
      color: var(--dark-navy);
      margin-bottom: 10px;
    }

    .step-desc {
      font-size: 0.9rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 案例展示区 */
    .case-card {
      background: #ffffff;
      border: 1px solid var(--card-border);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }

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

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

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

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

    .case-card:hover .case-img-container img {
      transform: scale(1.03);
    }

    .case-info {
      padding: 20px;
    }

    .case-title {
      font-size: 1.1rem;
      font-weight: 700;
      color: var(--dark-navy);
      margin-bottom: 8px;
    }

    .case-desc {
      font-size: 0.88rem;
      color: var(--text-muted);
      line-height: 1.55;
    }

    /* 客户评价网格 */
    .review-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .review-card {
      background: #ffffff;
      border: 1px solid var(--card-border);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .review-quote {
      font-size: 0.95rem;
      color: var(--text-main);
      line-height: 1.65;
      margin-bottom: 20px;
      position: relative;
    }

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

    .author-avatar-text {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--vibrant-blue), var(--royal-blue));
      color: #ffffff;
      font-weight: 700;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 0.95rem;
    }

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

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

    /* FAQ 手风琴 */
    .faq-accordion {
      max-width: 880px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }

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

    .faq-item.active {
      border-color: rgba(26, 115, 232, 0.4);
      box-shadow: var(--shadow-sm);
    }

    .faq-question {
      padding: 18px 22px;
      font-size: 1.05rem;
      font-weight: 600;
      color: var(--dark-navy);
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: space-between;
      user-select: none;
    }

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

    .faq-icon {
      font-size: 1.25rem;
      transition: var(--transition);
      color: var(--primary-blue);
    }

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

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease-out;
      background-color: #fbfdff;
    }

    .faq-answer-inner {
      padding: 0 22px 20px;
      font-size: 0.95rem;
      color: var(--text-muted);
      line-height: 1.65;
      border-top: 1px solid #f1f5f9;
      padding-top: 12px;
    }

    /* 需求表单与联系我们 */
    .contact-container {
      display: grid;
      grid-template-columns: 1fr 1.2fr;
      gap: 36px;
      background: #ffffff;
      border: 1px solid var(--card-border);
      border-radius: var(--radius-lg);
      padding: 40px;
      box-shadow: var(--shadow-md);
    }

    .contact-info-panel {
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .info-list {
      display: flex;
      flex-direction: column;
      gap: 18px;
      margin: 24px 0;
    }

    .info-row {
      display: flex;
      align-items: flex-start;
      gap: 12px;
    }

    .info-label {
      font-weight: 700;
      color: var(--dark-navy);
      min-width: 80px;
    }

    .info-val {
      color: var(--text-muted);
    }

    .qr-box {
      margin-top: 20px;
      display: inline-block;
      padding: 12px;
      background: #ffffff;
      border: 1px solid var(--card-border);
      border-radius: var(--radius-sm);
      text-align: center;
      max-width: 160px;
    }

    .qr-box img {
      width: 100%;
      height: auto;
      display: block;
      border-radius: 4px;
    }

    .qr-box span {
      display: block;
      font-size: 0.8rem;
      color: var(--text-muted);
      margin-top: 6px;
      font-weight: 500;
    }

    .form-box {
      background: var(--bg-light);
      padding: 30px;
      border-radius: var(--radius-md);
      border: 1px solid var(--card-border);
    }

    .form-group {
      margin-bottom: 18px;
    }

    .form-group label {
      display: block;
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--dark-navy);
      margin-bottom: 6px;
    }

    .form-control {
      width: 100%;
      padding: 12px 14px;
      font-size: 0.95rem;
      border: 1px solid var(--card-border);
      border-radius: var(--radius-sm);
      background-color: #ffffff;
      color: var(--text-main);
      outline: none;
      transition: var(--transition);
    }

    .form-control:focus {
      border-color: var(--vibrant-blue);
      box-shadow: 0 0 0 3px rgba(26, 115, 232, 0.15);
    }

    textarea.form-control {
      resize: vertical;
      min-height: 100px;
    }

    .btn-submit {
      width: 100%;
      padding: 14px;
      background: linear-gradient(135deg, var(--vibrant-blue), var(--primary-blue));
      color: #ffffff;
      font-size: 1rem;
      font-weight: 700;
      border: none;
      border-radius: var(--radius-sm);
      cursor: pointer;
      box-shadow: 0 4px 12px rgba(11, 87, 208, 0.25);
      transition: var(--transition);
    }

    .btn-submit:hover {
      background: var(--royal-blue);
      box-shadow: 0 6px 16px rgba(11, 87, 208, 0.35);
    }

    /* 行业资讯 & 友情链接 */
    .article-links-wrap {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 20px;
    }

    .article-chip {
      display: inline-flex;
      align-items: center;
      padding: 8px 16px;
      background: #ffffff;
      border: 1px solid var(--card-border);
      border-radius: var(--radius-sm);
      font-size: 0.88rem;
      color: var(--primary-blue);
      font-weight: 500;
      transition: var(--transition);
    }

    .article-chip:hover {
      border-color: var(--vibrant-blue);
      background: rgba(26, 115, 232, 0.05);
      transform: translateY(-2px);
    }

    /* 页脚 */
    .site-footer {
      background-color: #0f172a;
      color: #94a3b8;
      padding: 60px 0 30px;
      border-top: 1px solid #1e293b;
    }

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

    .footer-brand h4 {
      color: #ffffff;
      font-size: 1.3rem;
      font-weight: 700;
      margin-bottom: 12px;
    }

    .footer-brand p {
      font-size: 0.9rem;
      line-height: 1.65;
      max-width: 320px;
    }

    .footer-col h5 {
      color: #ffffff;
      font-size: 1rem;
      font-weight: 600;
      margin-bottom: 16px;
    }

    .footer-links-list li {
      margin-bottom: 10px;
    }

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

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

    .footer-bottom {
      border-top: 1px solid #1e293b;
      padding-top: 25px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 16px;
      font-size: 0.85rem;
    }

    .footer-friend-links {
      display: flex;
      flex-wrap: wrap;
      gap: 14px;
      align-items: center;
    }

    .footer-friend-links a {
      color: #64748b;
    }

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

    /* 悬浮工具栏 */
    .floating-tools {
      position: fixed;
      right: 20px;
      bottom: 40px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .float-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: #ffffff;
      color: var(--primary-blue);
      border: 1px solid var(--card-border);
      box-shadow: var(--shadow-md);
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      font-size: 1.2rem;
      font-weight: 700;
      transition: var(--transition);
    }

    .float-btn:hover {
      background: var(--primary-blue);
      color: #ffffff;
      transform: scale(1.08);
    }

    /* 响应式断点适配 */
    @media (max-width: 1024px) {
      .grid-4 {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
      .hero-stats-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .flow-steps-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 768px) {
      .section-wrap {
        padding: 50px 0;
      }
      .section-title {
        font-size: 1.7rem;
      }
      .hero-title {
        font-size: 2rem;
      }
      .mobile-menu-btn {
        display: block;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #ffffff;
        flex-direction: column;
        padding: 20px;
        border-bottom: 1px solid var(--card-border);
        box-shadow: var(--shadow-md);
      }
      .nav-links.active {
        display: flex;
      }
      .nav-links a {
        width: 100%;
        padding: 12px 16px;
      }
      .nav-cta {
        display: none;
      }
      .grid-2, .grid-3, .review-grid {
        grid-template-columns: 1fr;
      }
      .hero-stats-grid {
        grid-template-columns: 1fr 1fr;
        gap: 12px;
      }
      .contact-container {
        grid-template-columns: 1fr;
        padding: 24px;
      }
      .review-score-banner {
        flex-direction: column;
        text-align: center;
      }
      .score-right {
        flex-direction: column;
        gap: 8px;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .footer-bottom {
        flex-direction: column;
        align-items: flex-start;
      }
    }