:root {
      --primary-color: #0f4cff;
      --secondary-color: #ff3366;
      --accent-color: #ffaa00;
      --cyan-bright: #00d2ff;
      --text-main: #141b2d;
      --text-muted: #56617a;
      --bg-light: #f7f9fc;
      --card-bg: #ffffff;
      --border-color: #e2e8f0;
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --shadow-sm: 0 4px 12px rgba(15, 76, 255, 0.06);
      --shadow-md: 0 10px 28px rgba(15, 76, 255, 0.12);
      --container-width: 1200px;
    }
    * {
      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, sans-serif;
      background-color: var(--bg-light);
      color: var(--text-main);
      line-height: 1.6;
      overflow-x: hidden;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: all 0.25s ease;
    }
    ul, ol {
      list-style: none;
    }
    .site-container {
      width: 100%;
      max-width: var(--container-width);
      margin: 0 auto;
      padding: 0 20px;
    }
    
    /* 顶部导航 */
    .site-header {
      position: sticky;
      top: 0;
      background: rgba(255, 255, 255, 0.94);
      backdrop-filter: blur(12px);
      z-index: 1000;
      border-bottom: 2px solid #edf2f7;
      box-shadow: 0 2px 10px rgba(0,0,0,0.03);
    }
    .nav-wrapper {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .logo-container {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .logo-container .ai-page-logo {
      height: 42px;
      width: auto;
      object-fit: contain;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
    }
    .nav-links a {
      padding: 8px 14px;
      font-weight: 600;
      font-size: 14px;
      color: var(--text-main);
      border-radius: var(--radius-sm);
    }
    .nav-links a:hover {
      color: var(--primary-color);
      background-color: #edf2ff;
    }
    .header-actions {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .btn-nav-action {
      background: linear-gradient(135deg, var(--secondary-color), #ff6b3d);
      color: #fff;
      padding: 10px 20px;
      border-radius: 30px;
      font-weight: 700;
      font-size: 14px;
      box-shadow: 0 4px 14px rgba(255, 51, 102, 0.3);
      display: inline-block;
    }
    .btn-nav-action:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 18px rgba(255, 51, 102, 0.4);
    }
    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      cursor: pointer;
      color: var(--text-main);
    }

    /* 首屏 Hero 区域 (严禁出现图片) */
    .hero-section {
      background: linear-gradient(135deg, #ffffff 0%, #edf4ff 50%, #fff1f5 100%);
      padding: 80px 0 60px;
      position: relative;
      border-bottom: 1px solid var(--border-color);
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1.2fr 0.8fr;
      gap: 40px;
      align-items: center;
    }
    .hero-content {
      position: relative;
      z-index: 2;
    }
    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 14px;
      background: rgba(15, 76, 255, 0.08);
      border: 1px solid rgba(15, 76, 255, 0.2);
      border-radius: 20px;
      font-size: 13px;
      color: var(--primary-color);
      font-weight: 700;
      margin-bottom: 20px;
    }
    .hero-title {
      font-size: 42px;
      line-height: 1.25;
      font-weight: 900;
      color: #0b132b;
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }
    .hero-title span.color-mark {
      background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .hero-desc {
      font-size: 17px;
      color: var(--text-muted);
      margin-bottom: 32px;
      line-height: 1.7;
    }
    .hero-btn-group {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      margin-bottom: 36px;
    }
    .btn-main-official {
      background: linear-gradient(135deg, var(--primary-color), #002db3);
      color: #ffffff !important;
      padding: 15px 34px;
      font-size: 16px;
      font-weight: 700;
      border-radius: 40px;
      box-shadow: 0 8px 24px rgba(15, 76, 255, 0.35);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
    }
    .btn-main-official:hover {
      transform: translateY(-3px);
      box-shadow: 0 12px 28px rgba(15, 76, 255, 0.45);
    }
    .btn-sub-action {
      background: #ffffff;
      color: var(--text-main);
      border: 2px solid #cbd5e1;
      padding: 14px 28px;
      font-size: 16px;
      font-weight: 700;
      border-radius: 40px;
    }
    .btn-sub-action:hover {
      border-color: var(--primary-color);
      color: var(--primary-color);
      background: #f8faff;
    }
    .hero-meta-points {
      display: flex;
      gap: 24px;
      font-size: 14px;
      color: var(--text-muted);
      font-weight: 600;
    }
    .hero-meta-points li {
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .hero-meta-points li::before {
      content: "✓";
      color: #10b981;
      font-weight: 900;
    }

    /* 首屏纯CSS装饰卡片 (无图片) */
    .hero-interactive-board {
      background: #ffffff;
      border: 2px solid #e0e7ff;
      border-radius: var(--radius-lg);
      padding: 28px;
      box-shadow: var(--shadow-md);
      position: relative;
    }
    .board-header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      margin-bottom: 20px;
      border-bottom: 1px solid #f1f5f9;
      padding-bottom: 12px;
    }
    .board-badge {
      background: #ffecf0;
      color: var(--secondary-color);
      padding: 4px 10px;
      border-radius: 6px;
      font-size: 12px;
      font-weight: 700;
    }
    .board-model-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      margin-bottom: 20px;
    }
    .model-chip {
      background: #f1f5f9;
      color: #334155;
      padding: 6px 12px;
      border-radius: 20px;
      font-size: 12px;
      font-weight: 600;
    }
    .model-chip.active {
      background: var(--primary-color);
      color: #ffffff;
    }
    .board-metrics-panel {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 14px;
    }
    .metric-card-mini {
      background: #f8fafc;
      border: 1px solid #edf2f7;
      border-radius: var(--radius-sm);
      padding: 14px;
      border-left: 4px solid var(--primary-color);
    }
    .metric-card-mini:nth-child(2) {
      border-left-color: var(--secondary-color);
    }
    .metric-card-mini .val {
      font-size: 22px;
      font-weight: 900;
      color: var(--text-main);
    }
    .metric-card-mini .sub {
      font-size: 12px;
      color: var(--text-muted);
    }

    /* 通用Section布局 */
    .section-block {
      padding: 70px 0;
      border-bottom: 1px solid #edf2f7;
    }
    .section-header {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 50px;
    }
    .section-tag {
      display: inline-block;
      font-size: 13px;
      font-weight: 800;
      text-transform: uppercase;
      padding: 4px 14px;
      border-radius: 20px;
      margin-bottom: 12px;
      background: #eef2ff;
      color: var(--primary-color);
      border: 1px solid #dbeafe;
    }
    .section-title {
      font-size: 32px;
      font-weight: 800;
      color: #0f172a;
      margin-bottom: 14px;
    }
    .section-subtitle {
      font-size: 16px;
      color: var(--text-muted);
    }

    /* 关于我们与平台介绍 */
    .intro-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .intro-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 30px;
      box-shadow: var(--shadow-sm);
      transition: transform 0.3s ease;
    }
    .intro-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-md);
      border-color: #c7d2fe;
    }
    .intro-icon {
      width: 48px;
      height: 48px;
      border-radius: 12px;
      background: linear-gradient(135deg, #0f4cff, #38bdf8);
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 20px;
      font-weight: 900;
      margin-bottom: 20px;
    }
    .intro-icon.pink {
      background: linear-gradient(135deg, var(--secondary-color), #fb7185);
    }
    .intro-icon.amber {
      background: linear-gradient(135deg, var(--accent-color), #f59e0b);
    }
    .intro-card h3 {
      font-size: 19px;
      font-weight: 700;
      margin-bottom: 12px;
      color: var(--text-main);
    }
    .intro-card p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* 场景矩阵服务能力 */
    .service-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .service-box {
      background: #ffffff;
      border: 1px solid #e2e8f0;
      border-radius: var(--radius-md);
      padding: 24px;
      position: relative;
      overflow: hidden;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .service-box::before {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      width: 4px;
      height: 100%;
      background: var(--primary-color);
    }
    .service-box:nth-child(2n)::before {
      background: var(--secondary-color);
    }
    .service-box:nth-child(3n)::before {
      background: var(--accent-color);
    }
    .service-box h3 {
      font-size: 18px;
      font-weight: 700;
      margin-bottom: 10px;
      color: #0f172a;
    }
    .service-box p {
      font-size: 13.5px;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 14px;
    }
    .service-tags-wrap {
      display: flex;
      flex-wrap: wrap;
      gap: 6px;
    }
    .service-tags-wrap span {
      font-size: 11px;
      background: #f1f5f9;
      color: #475569;
      padding: 3px 8px;
      border-radius: 4px;
      font-weight: 600;
    }

    /* 案例展示区 */
    .case-container {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 30px;
      align-items: center;
    }
    .case-visual-group {
      display: flex;
      flex-direction: column;
      gap: 16px;
    }
    .case-img-box {
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 2px solid #e2e8f0;
      background: #ffffff;
      box-shadow: var(--shadow-sm);
    }
    .case-img-box img {
      width: 100%;
      height: auto;
      display: block;
      object-fit: cover;
    }
    .case-info-content {
      padding: 20px;
    }
    .case-info-content h3 {
      font-size: 26px;
      font-weight: 800;
      margin-bottom: 16px;
      color: #0f172a;
    }
    .case-stat-strip {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 16px;
      margin: 24px 0;
    }
    .stat-pill {
      background: #ffffff;
      border: 1px solid #e2e8f0;
      padding: 16px;
      border-radius: var(--radius-sm);
      text-align: center;
    }
    .stat-pill .num {
      font-size: 24px;
      font-weight: 900;
      color: var(--primary-color);
    }
    .stat-pill .label {
      font-size: 12px;
      color: var(--text-muted);
    }

    /* 模型矩阵支持栏目 */
    .models-cloud {
      background: #ffffff;
      border: 1px solid #e2e8f0;
      border-radius: var(--radius-md);
      padding: 30px;
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      justify-content: center;
    }
    .model-badge {
      background: #f8fafc;
      border: 1px solid #cbd5e1;
      padding: 8px 16px;
      border-radius: 30px;
      font-size: 13px;
      font-weight: 700;
      color: #334155;
      transition: all 0.2s ease;
    }
    .model-badge:hover {
      background: #0f4cff;
      color: #ffffff;
      border-color: #0f4cff;
      transform: translateY(-2px);
    }

    /* 对比评测模块 */
    .compare-card {
      background: #ffffff;
      border-radius: var(--radius-lg);
      border: 2px solid #e2e8f0;
      box-shadow: var(--shadow-md);
      overflow: hidden;
    }
    .rating-banner {
      background: linear-gradient(135deg, #0f172a, #1e293b);
      color: #ffffff;
      padding: 24px 30px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 16px;
    }
    .rating-score {
      display: flex;
      align-items: center;
      gap: 16px;
    }
    .score-big {
      font-size: 38px;
      font-weight: 900;
      color: #facc15;
    }
    .rating-stars {
      color: #facc15;
      font-size: 20px;
      letter-spacing: 2px;
    }
    .rating-desc {
      font-size: 14px;
      color: #cbd5e1;
    }
    .compare-table-wrap {
      overflow-x: auto;
    }
    .compare-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      font-size: 14px;
    }
    .compare-table th, .compare-table td {
      padding: 16px 20px;
      border-bottom: 1px solid #f1f5f9;
    }
    .compare-table th {
      background: #f8fafc;
      font-weight: 700;
      color: #0f172a;
    }
    .compare-table tr:hover {
      background: #fbfcfe;
    }
    .highlight-col {
      background: #eff6ff;
      font-weight: 700;
      color: var(--primary-color);
    }

    /* 流程步骤 */
    .steps-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .step-item {
      background: #ffffff;
      border: 1px solid #e2e8f0;
      border-radius: var(--radius-md);
      padding: 24px;
      position: relative;
    }
    .step-num {
      width: 36px;
      height: 36px;
      border-radius: 50%;
      background: var(--primary-color);
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      font-size: 16px;
      margin-bottom: 16px;
    }
    .step-item h3 {
      font-size: 17px;
      font-weight: 700;
      margin-bottom: 8px;
    }
    .step-item p {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 6条用户评论 */
    .reviews-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .review-card {
      background: #ffffff;
      border: 1px solid #e2e8f0;
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .review-text {
      font-size: 14px;
      color: #334155;
      line-height: 1.7;
      margin-bottom: 20px;
      font-style: italic;
    }
    .reviewer-meta {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid #f1f5f9;
      padding-top: 14px;
    }
    .reviewer-avatar {
      width: 42px;
      height: 42px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      font-size: 14px;
    }
    .reviewer-name {
      font-size: 14px;
      font-weight: 700;
      color: var(--text-main);
    }
    .reviewer-role {
      font-size: 12px;
      color: var(--text-muted);
    }

    /* FAQ 折叠 */
    .faq-container {
      max-width: 900px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }
    .faq-item {
      background: #ffffff;
      border: 1px solid #e2e8f0;
      border-radius: var(--radius-sm);
      overflow: hidden;
    }
    .faq-question {
      padding: 18px 24px;
      font-weight: 700;
      font-size: 16px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      color: #1e293b;
      user-select: none;
    }
    .faq-question:hover {
      background: #f8fafc;
      color: var(--primary-color);
    }
    .faq-icon {
      font-size: 18px;
      transition: transform 0.3s ease;
    }
    .faq-answer {
      display: none;
      padding: 0 24px 20px;
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
    }
    .faq-item.active .faq-answer {
      display: block;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
      color: var(--secondary-color);
    }

    /* 需求匹配与表单 */
    .form-section-wrap {
      display: grid;
      grid-template-columns: 1fr 1.2fr;
      gap: 40px;
      background: #ffffff;
      border-radius: var(--radius-lg);
      border: 1px solid #e2e8f0;
      padding: 40px;
      box-shadow: var(--shadow-md);
    }
    .form-lead h3 {
      font-size: 26px;
      font-weight: 800;
      margin-bottom: 14px;
    }
    .form-lead p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 24px;
    }
    .qr-box {
      background: #f8fafc;
      border: 1px solid #e2e8f0;
      border-radius: var(--radius-md);
      padding: 20px;
      display: inline-flex;
      flex-direction: column;
      align-items: center;
      gap: 10px;
    }
    .qr-box img {
      width: 140px;
      height: 140px;
      object-fit: contain;
      border-radius: var(--radius-sm);
    }
    .qr-box span {
      font-size: 13px;
      font-weight: 700;
      color: var(--text-main);
    }
    .custom-form {
      display: flex;
      flex-direction: column;
      gap: 18px;
    }
    .form-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 16px;
    }
    .form-group {
      display: flex;
      flex-direction: column;
      gap: 6px;
    }
    .form-group label {
      font-size: 13px;
      font-weight: 700;
      color: #334155;
    }
    .form-input, .form-select, .form-textarea {
      width: 100%;
      padding: 12px 14px;
      border: 1px solid #cbd5e1;
      border-radius: var(--radius-sm);
      font-size: 14px;
      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(15, 76, 255, 0.1);
    }
    .btn-submit {
      background: linear-gradient(135deg, var(--primary-color), #0033cc);
      color: #ffffff;
      border: none;
      padding: 14px 28px;
      font-size: 16px;
      font-weight: 700;
      border-radius: var(--radius-sm);
      cursor: pointer;
      box-shadow: 0 4px 14px rgba(15, 76, 255, 0.3);
      transition: transform 0.2s ease;
    }
    .btn-submit:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(15, 76, 255, 0.4);
    }

    /* 宣传图展示区 */
    .banner-media-row {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
      margin-top: 30px;
    }
    .banner-media-item {
      border-radius: var(--radius-sm);
      overflow: hidden;
      border: 1px solid #e2e8f0;
    }
    .banner-media-item img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      display: block;
    }

    /* 资讯与友情链接 */
    .article-links-strip {
      background: #ffffff;
      border: 1px solid #e2e8f0;
      border-radius: var(--radius-md);
      padding: 24px;
      margin-bottom: 24px;
    }
    .article-links-strip h4 {
      font-size: 16px;
      margin-bottom: 12px;
      color: #0f172a;
    }
    .article-list-wrap {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
    }
    .article-list-wrap a {
      background: #f1f5f9;
      padding: 6px 14px;
      border-radius: 4px;
      font-size: 13px;
      color: var(--primary-color);
      font-weight: 600;
    }
    .article-list-wrap a:hover {
      background: #e0e7ff;
    }

    /* 底部通用footer */
    .site-footer {
      background: #0b132b;
      color: #94a3b8;
      padding: 60px 0 30px;
      font-size: 14px;
      border-top: 4px solid var(--primary-color);
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 30px;
      margin-bottom: 40px;
    }
    .footer-col h4 {
      color: #ffffff;
      font-size: 16px;
      font-weight: 700;
      margin-bottom: 16px;
    }
    .footer-links-list li {
      margin-bottom: 10px;
    }
    .footer-links-list a:hover {
      color: #ffffff;
    }
    .friend-links-box {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
    }
    .friend-links-box a {
      color: #94a3b8;
      background: rgba(255, 255, 255, 0.05);
      padding: 4px 10px;
      border-radius: 4px;
      font-size: 12px;
    }
    .friend-links-box a:hover {
      color: #ffffff;
      background: rgba(255, 255, 255, 0.15);
    }
    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      padding-top: 24px;
      text-align: center;
      font-size: 13px;
      color: #64748b;
    }

    /* 浮动工具栏 */
    .floating-toolbar {
      position: fixed;
      right: 20px;
      bottom: 30px;
      display: flex;
      flex-direction: column;
      gap: 10px;
      z-index: 999;
    }
    .float-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: #ffffff;
      border: 1px solid #e2e8f0;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 4px 14px rgba(0,0,0,0.15);
      cursor: pointer;
      color: var(--primary-color);
      font-weight: 900;
      transition: all 0.2s;
    }
    .float-btn:hover {
      background: var(--primary-color);
      color: #ffffff;
      transform: scale(1.08);
    }

    /* 响应式调整 */
    @media (max-width: 992px) {
      .hero-grid {
        grid-template-columns: 1fr;
      }
      .intro-grid, .service-grid, .reviews-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .steps-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .case-container {
        grid-template-columns: 1fr;
      }
      .form-section-wrap {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .banner-media-row {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #ffffff;
        flex-direction: column;
        padding: 20px;
        box-shadow: 0 8px 20px rgba(0,0,0,0.1);
        border-bottom: 1px solid #edf2f7;
      }
      .nav-links.show {
        display: flex;
      }
      .mobile-menu-btn {
        display: block;
      }
      .hero-title {
        font-size: 30px;
      }
      .intro-grid, .service-grid, .reviews-grid, .steps-grid {
        grid-template-columns: 1fr;
      }
      .form-row {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .banner-media-row {
        grid-template-columns: 1fr;
      }
    }