:root {
      --primary: #0b57d0;
      --primary-hover: #0842a0;
      --primary-light: #e8f0fe;
      --accent: #00d2ff;
      --text-main: #1e293b;
      --text-muted: #64748b;
      --text-light: #94a3b8;
      --bg-page: #f8fafc;
      --bg-card: #ffffff;
      --border-color: #e2e8f0;
      --shadow-sm: 0 2px 4px rgba(11,87,208,0.04);
      --shadow-md: 0 8px 24px rgba(11,87,208,0.08);
      --shadow-lg: 0 16px 36px rgba(11,87,208,0.12);
      --radius: 12px;
      --transition: all 0.3s 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, sans-serif;
      background-color: var(--bg-page);
      color: var(--text-main);
      line-height: 1.6;
      overflow-x: hidden;
    }

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

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

    ul, ol {
      list-style: none;
    }

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

    .section-title-wrap {
      text-align: center;
      margin-bottom: 48px;
    }

    .section-tag {
      display: inline-block;
      padding: 4px 16px;
      background: var(--primary-light);
      color: var(--primary);
      font-size: 0.875rem;
      font-weight: 600;
      border-radius: 9999px;
      margin-bottom: 12px;
      letter-spacing: 0.5px;
    }

    .section-heading {
      font-size: 2.25rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 16px;
      line-height: 1.3;
    }

    .section-desc {
      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, 0.95);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
    }

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

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

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

    .nav-menu {
      display: flex;
      align-items: center;
    }

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

    .nav-links a {
      padding: 8px 14px;
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--text-main);
      border-radius: 6px;
    }

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

    .nav-actions {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-left: 16px;
    }

    .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, var(--primary) 0%, #1a73e8 100%);
      color: #ffffff;
      box-shadow: 0 4px 14px rgba(11, 87, 208, 0.28);
    }

    .btn-primary:hover {
      background: linear-gradient(135deg, var(--primary-hover) 0%, var(--primary) 100%);
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(11, 87, 208, 0.35);
    }

    .btn-outline {
      background: transparent;
      border-color: var(--border-color);
      color: var(--text-main);
    }

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

    .nav-toggle {
      display: none;
      background: none;
      border: none;
      cursor: pointer;
      padding: 8px;
    }

    .nav-toggle span {
      display: block;
      width: 24px;
      height: 2px;
      background: var(--text-main);
      margin: 5px 0;
      transition: var(--transition);
    }

    /* 首屏 Hero 无图片要求 */
    .hero-section {
      position: relative;
      padding: 96px 0 80px;
      background: radial-gradient(circle at 80% 20%, rgba(0, 210, 255, 0.08) 0%, transparent 40%),
                  radial-gradient(circle at 20% 80%, rgba(11, 87, 208, 0.06) 0%, transparent 45%),
                  #ffffff;
      border-bottom: 1px solid var(--border-color);
      overflow: hidden;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1.15fr 0.85fr;
      gap: 48px;
      align-items: center;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 14px;
      background: #eff6ff;
      border: 1px solid #bfdbfe;
      border-radius: 9999px;
      font-size: 0.85rem;
      font-weight: 600;
      color: var(--primary);
      margin-bottom: 24px;
    }

    .hero-badge-pulse {
      width: 8px;
      height: 8px;
      background: #3b82f6;
      border-radius: 50%;
      box-shadow: 0 0 0 0 rgba(59, 130, 246, 0.7);
      animation: pulse 1.8s infinite;
    }

    @keyframes pulse {
      0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(59, 130, 246, 0.7); }
      70% { transform: scale(1); box-shadow: 0 0 0 8px rgba(59, 130, 246, 0); }
      100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(59, 130, 246, 0); }
    }

    .hero-title {
      font-size: 2.85rem;
      font-weight: 800;
      line-height: 1.25;
      color: #0f172a;
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }

    .hero-title span {
      color: var(--primary);
    }

    .hero-subtitle {
      font-size: 1.125rem;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 36px;
    }

    .hero-cta-group {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      margin-bottom: 36px;
    }

    .btn-hero-main {
      padding: 14px 34px;
      font-size: 1.05rem;
    }

    .hero-metrics {
      display: flex;
      align-items: center;
      gap: 28px;
      padding-top: 24px;
      border-top: 1px solid var(--border-color);
    }

    .metric-item-num {
      font-size: 1.4rem;
      font-weight: 700;
      color: #0f172a;
    }

    .metric-item-lbl {
      font-size: 0.8rem;
      color: var(--text-muted);
    }

    .hero-console-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      box-shadow: var(--shadow-lg);
      padding: 32px;
      position: relative;
    }

    .console-header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      margin-bottom: 20px;
      padding-bottom: 12px;
      border-bottom: 1px solid var(--border-color);
    }

    .console-title {
      font-size: 0.95rem;
      font-weight: 700;
      color: var(--text-main);
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .console-dot {
      width: 10px;
      height: 10px;
      border-radius: 50%;
      background: #10b981;
    }

    .model-pills {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      margin-bottom: 24px;
    }

    .model-pill {
      font-size: 0.75rem;
      padding: 4px 10px;
      background: var(--bg-page);
      border: 1px solid var(--border-color);
      border-radius: 6px;
      font-weight: 500;
      color: var(--text-main);
    }

    .model-pill.active {
      background: var(--primary-light);
      border-color: #bfdbfe;
      color: var(--primary);
      font-weight: 600;
    }

    .console-feature-list {
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .console-feature-item {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 12px 16px;
      background: #f8fafc;
      border-radius: 8px;
      border: 1px solid #edf2f7;
    }

    .feature-name {
      font-size: 0.875rem;
      font-weight: 600;
      color: var(--text-main);
    }

    .feature-status {
      font-size: 0.75rem;
      color: var(--primary);
      font-weight: 600;
      background: #ffffff;
      padding: 2px 8px;
      border-radius: 4px;
      border: 1px solid #dbeafe;
    }

    /* 模块通用样式 */
    .section-block {
      padding: 88px 0;
    }

    .bg-light {
      background-color: #ffffff;
      border-top: 1px solid var(--border-color);
      border-bottom: 1px solid var(--border-color);
    }

    /* 平台核心卡片 */
    .cards-grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

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

    .feature-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 30px;
      transition: var(--transition);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .feature-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-md);
      border-color: #bfdbfe;
    }

    .card-icon-box {
      width: 52px;
      height: 52px;
      background: var(--primary-light);
      color: var(--primary);
      border-radius: 10px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.4rem;
      margin-bottom: 20px;
    }

    .card-title {
      font-size: 1.2rem;
      font-weight: 700;
      margin-bottom: 12px;
      color: #0f172a;
    }

    .card-text {
      font-size: 0.925rem;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 16px;
    }

    /* 场景分类标签 */
    .scene-tag-list {
      display: flex;
      flex-wrap: wrap;
      gap: 6px;
    }

    .scene-tag-item {
      font-size: 0.75rem;
      padding: 3px 8px;
      background: #f1f5f9;
      color: #475569;
      border-radius: 4px;
    }

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

    .step-card {
      background: #ffffff;
      padding: 28px 24px;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      position: relative;
    }

    .step-badge {
      font-size: 1.5rem;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 16px;
      display: inline-block;
      line-height: 1;
    }

    .step-name {
      font-size: 1.1rem;
      font-weight: 700;
      margin-bottom: 10px;
      color: #0f172a;
    }

    .step-desc {
      font-size: 0.875rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 对比评测表格 */
    .compare-container {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      box-shadow: var(--shadow-sm);
      overflow-x: auto;
    }

    .eval-score-bar {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 24px 32px;
      background: linear-gradient(90deg, #eff6ff 0%, #ffffff 100%);
      border-bottom: 1px solid var(--border-color);
    }

    .score-left h4 {
      font-size: 1.25rem;
      color: var(--text-main);
      font-weight: 700;
    }

    .score-left p {
      font-size: 0.9rem;
      color: var(--text-muted);
    }

    .score-right {
      display: flex;
      align-items: baseline;
      gap: 8px;
    }

    .score-num {
      font-size: 2.4rem;
      font-weight: 900;
      color: var(--primary);
    }

    .score-max {
      font-size: 1.1rem;
      font-weight: 600;
      color: var(--text-light);
    }

    .compare-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
    }

    .compare-table th, 
    .compare-table td {
      padding: 16px 24px;
      font-size: 0.925rem;
      border-bottom: 1px solid var(--border-color);
    }

    .compare-table th {
      background: #f8fafc;
      color: var(--text-muted);
      font-weight: 600;
    }

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

    /* 案例图片展示 */
    .showcase-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 28px;
    }

    .showcase-card {
      background: #ffffff;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }

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

    .showcase-media {
      width: 100%;
      overflow: hidden;
      background: #f1f5f9;
      aspect-ratio: 16 / 9;
    }

    .showcase-media img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: var(--transition);
    }

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

    .showcase-body {
      padding: 24px;
    }

    .showcase-title {
      font-size: 1.15rem;
      font-weight: 700;
      color: #0f172a;
      margin-bottom: 8px;
    }

    .showcase-desc {
      font-size: 0.875rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 用户评论 */
    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

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

    .review-card:hover {
      box-shadow: var(--shadow-md);
      border-color: #bfdbfe;
    }

    .review-text {
      font-size: 0.925rem;
      color: #334155;
      line-height: 1.65;
      margin-bottom: 20px;
    }

    .review-user {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid #f1f5f9;
      padding-top: 14px;
    }

    .user-avatar-text {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      background: var(--primary-light);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 0.95rem;
    }

    .user-name {
      font-size: 0.9rem;
      font-weight: 700;
      color: var(--text-main);
    }

    .user-role {
      font-size: 0.8rem;
      color: var(--text-muted);
    }

    /* FAQ 手风琴 */
    .faq-container {
      max-width: 900px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }

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

    .faq-item.active {
      border-color: #93c5fd;
      box-shadow: var(--shadow-sm);
    }

    .faq-question {
      padding: 18px 24px;
      font-size: 1rem;
      font-weight: 600;
      color: var(--text-main);
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      user-select: none;
    }

    .faq-arrow {
      font-size: 0.8rem;
      transition: var(--transition);
      color: var(--text-light);
    }

    .faq-item.active .faq-arrow {
      transform: rotate(180deg);
      color: var(--primary);
    }

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

    .faq-answer-inner {
      padding: 0 24px 20px;
      font-size: 0.925rem;
      color: var(--text-muted);
      line-height: 1.65;
    }

    /* 需求匹配与表单 */
    .form-section-grid {
      display: grid;
      grid-template-columns: 1fr 1.1fr;
      gap: 48px;
      background: #ffffff;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      padding: 48px;
      box-shadow: var(--shadow-sm);
    }

    .contact-info-list {
      margin-top: 24px;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .contact-info-item {
      display: flex;
      align-items: center;
      gap: 12px;
      font-size: 0.95rem;
      color: var(--text-main);
    }

    .contact-info-label {
      font-weight: 600;
      color: var(--text-muted);
      width: 72px;
    }

    .qr-box {
      margin-top: 24px;
      display: flex;
      align-items: center;
      gap: 16px;
      padding: 16px;
      background: var(--bg-page);
      border-radius: 8px;
      border: 1px solid var(--border-color);
    }

    .qr-box img {
      width: 88px;
      height: 88px;
      border-radius: 6px;
    }

    .qr-text h5 {
      font-size: 0.95rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 4px;
    }

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

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

    .form-group label {
      display: block;
      font-size: 0.875rem;
      font-weight: 600;
      margin-bottom: 6px;
      color: var(--text-main);
    }

    .form-control {
      width: 100%;
      padding: 12px 14px;
      border: 1px solid var(--border-color);
      border-radius: 6px;
      font-size: 0.925rem;
      outline: none;
      transition: var(--transition);
      background: #ffffff;
      color: var(--text-main);
    }

    .form-control:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(11, 87, 208, 0.12);
    }

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

    /* 资讯列表 */
    .article-links-container {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
      gap: 16px;
      margin-top: 24px;
    }

    .article-link-card {
      padding: 16px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      font-size: 0.9rem;
      font-weight: 500;
      color: var(--text-main);
      display: flex;
      align-items: center;
      justify-content: space-between;
      transition: var(--transition);
    }

    .article-link-card:hover {
      border-color: var(--primary);
      color: var(--primary);
      transform: translateX(3px);
    }

    /* 底部页脚 */
    .site-footer {
      background: #0f172a;
      color: #94a3b8;
      padding: 64px 0 32px;
      font-size: 0.875rem;
      border-top: 1px solid #1e293b;
    }

    .footer-top-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1fr;
      gap: 40px;
      margin-bottom: 48px;
    }

    .footer-col h5 {
      color: #ffffff;
      font-size: 1rem;
      font-weight: 700;
      margin-bottom: 20px;
    }

    .footer-links-list {
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .footer-links-list a {
      color: #94a3b8;
    }

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

    .friend-links-box {
      padding-top: 24px;
      border-top: 1px solid #1e293b;
      margin-bottom: 32px;
    }

    .friend-links-box span {
      color: #cbd5e1;
      font-weight: 600;
      margin-right: 12px;
      display: inline-block;
      margin-bottom: 8px;
    }

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

    .friend-links-wrap a {
      color: #94a3b8;
    }

    .friend-links-wrap a:hover {
      color: #ffffff;
    }

    .footer-bottom {
      text-align: center;
      padding-top: 24px;
      border-top: 1px solid #1e293b;
      color: #64748b;
      font-size: 0.8rem;
    }

    /* 浮动交互组件 */
    .floating-service {
      position: fixed;
      right: 24px;
      bottom: 32px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .float-btn {
      width: 48px;
      height: 48px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: var(--shadow-md);
      cursor: pointer;
      color: var(--primary);
      transition: var(--transition);
      font-size: 1.1rem;
    }

    .float-btn:hover {
      background: var(--primary);
      color: #ffffff;
      transform: translateY(-2px);
    }

    /* 响应式样式 */
    @media (max-width: 1024px) {
      .cards-grid-4 {
        grid-template-columns: repeat(2, 1fr);
      }
      .steps-timeline {
        grid-template-columns: repeat(2, 1fr);
      }
      .hero-grid {
        grid-template-columns: 1fr;
      }
      .footer-top-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .form-section-grid {
        grid-template-columns: 1fr;
        padding: 32px;
      }
    }

    @media (max-width: 768px) {
      .nav-menu {
        position: fixed;
        top: 72px;
        left: 0;
        right: 0;
        background: #ffffff;
        flex-direction: column;
        align-items: flex-start;
        padding: 24px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-md);
        display: none;
      }
      .nav-menu.open {
        display: flex;
      }
      .nav-links {
        flex-direction: column;
        width: 100%;
        align-items: flex-start;
      }
      .nav-links a {
        width: 100%;
        padding: 10px 0;
      }
      .nav-actions {
        width: 100%;
        margin: 16px 0 0 0;
        flex-direction: column;
      }
      .nav-actions .btn {
        width: 100%;
      }
      .nav-toggle {
        display: block;
      }
      .cards-grid-3,
      .testimonial-grid,
      .showcase-grid {
        grid-template-columns: 1fr;
      }
      .cards-grid-4,
      .steps-timeline {
        grid-template-columns: 1fr;
      }
      .footer-top-grid {
        grid-template-columns: 1fr;
      }
      .hero-title {
        font-size: 2.1rem;
      }
      .hero-metrics {
        flex-wrap: wrap;
        gap: 16px;
      }
    }