:root {
      --primary: #4f46e5;
      --primary-hover: #4338ca;
      --accent-orange: #f97316;
      --accent-cyan: #0891b2;
      --accent-pink: #db2777;
      --text-main: #0f172a;
      --text-muted: #475569;
      --text-light: #64748b;
      --bg-main: #f8fafc;
      --bg-card: #ffffff;
      --bg-alt: #f1f5f9;
      --border-color: #e2e8f0;
      --border-accent: #cbd5e1;
      --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.08);
      --shadow-md: 0 4px 6px -1px rgba(15, 23, 42, 0.1), 0 2px 4px -2px rgba(15, 23, 42, 0.06);
      --shadow-lg: 0 10px 15px -3px rgba(15, 23, 42, 0.08), 0 4px 6px -4px rgba(15, 23, 42, 0.04);
      --shadow-accent: 0 10px 25px -5px rgba(79, 70, 229, 0.15);
      --radius-sm: 6px;
      --radius-md: 10px;
      --radius-lg: 16px;
      --transition: all 0.25s 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-main);
      color: var(--text-main);
      line-height: 1.6;
      overflow-x: hidden;
    }

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

    ul, ol {
      list-style: none;
    }

    /* 统一居中容器规范 */
    .container {
      width: 100%;
      max-width: 1200px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 20px;
      padding-right: 20px;
    }

    /* 顶部导航栏 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(8px);
      border-bottom: 2px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

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

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

    .brand-box .ai-page-logo {
      height: 40px;
      width: auto;
      display: block;
    }

    .brand-name {
      font-size: 1.25rem;
      font-weight: 800;
      color: var(--primary);
      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: 600;
      color: var(--text-muted);
      border-radius: var(--radius-sm);
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary);
      background-color: #eef2ff;
    }

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

    .btn-nav-primary {
      padding: 9px 18px;
      background: var(--accent-orange);
      color: #ffffff !important;
      font-size: 0.9rem;
      font-weight: 700;
      border-radius: var(--radius-md);
      box-shadow: 0 2px 8px rgba(249, 115, 22, 0.3);
    }

    .btn-nav-primary:hover {
      background: #ea580c;
      transform: translateY(-1px);
    }

    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      cursor: pointer;
      padding: 6px;
    }

    .mobile-menu-btn span {
      display: block;
      width: 24px;
      height: 3px;
      background: var(--text-main);
      margin: 4px 0;
      border-radius: 2px;
      transition: var(--transition);
    }

    /* 首屏 Hero (无图片，强视觉撞色几何风格) */
    .hero-section {
      background: linear-gradient(135deg, #ffffff 0%, #f0f7ff 50%, #fef3c7 100%);
      border-bottom: 1px solid var(--border-color);
      padding: 70px 0 60px;
      position: relative;
    }

    .hero-wrapper {
      display: flex;
      flex-direction: column;
      align-items: center;
      text-align: center;
    }

    .hero-badge-group {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 8px;
      margin-bottom: 20px;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      padding: 4px 12px;
      font-size: 0.82rem;
      font-weight: 700;
      border-radius: 20px;
      border: 1px solid;
    }

    .badge-cyan { background: #ecfeff; color: var(--accent-cyan); border-color: #a5f3fc; }
    .badge-orange { background: #fff7ed; color: var(--accent-orange); border-color: #fed7aa; }
    .badge-pink { background: #fdf2f8; color: var(--accent-pink); border-color: #fbcfe8; }
    .badge-purple { background: #eef2ff; color: var(--primary); border-color: #c7d2fe; }

    .hero-title {
      font-size: 2.3rem;
      font-weight: 900;
      color: var(--text-main);
      line-height: 1.3;
      margin-bottom: 16px;
      max-width: 900px;
    }

    .hero-desc {
      font-size: 1.125rem;
      color: var(--text-muted);
      max-width: 780px;
      margin-bottom: 32px;
      line-height: 1.7;
    }

    .hero-cta-group {
      display: flex;
      align-items: center;
      justify-content: center;
      flex-wrap: wrap;
      gap: 16px;
      margin-bottom: 40px;
    }

    .btn-official-hero {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 14px 32px;
      background: linear-gradient(135deg, #f97316 0%, #ea580c 100%);
      color: #ffffff;
      font-size: 1.1rem;
      font-weight: 800;
      border-radius: var(--radius-md);
      box-shadow: 0 8px 20px rgba(249, 115, 22, 0.35);
      border: 2px solid #ffedd5;
    }

    .btn-official-hero:hover {
      transform: translateY(-2px);
      box-shadow: 0 12px 24px rgba(249, 115, 22, 0.45);
    }

    .btn-secondary-hero {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 14px 28px;
      background: #ffffff;
      color: var(--primary);
      border: 2px solid var(--primary);
      font-size: 1rem;
      font-weight: 700;
      border-radius: var(--radius-md);
    }

    .btn-secondary-hero:hover {
      background: #eef2ff;
    }

    .hero-feature-pill-box {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
      gap: 16px;
      width: 100%;
      max-width: 1050px;
    }

    .hero-pill-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-left: 4px solid var(--primary);
      padding: 16px 20px;
      border-radius: var(--radius-md);
      text-align: left;
      box-shadow: var(--shadow-sm);
    }

    .hero-pill-item:nth-child(2) { border-left-color: var(--accent-orange); }
    .hero-pill-item:nth-child(3) { border-left-color: var(--accent-cyan); }
    .hero-pill-item:nth-child(4) { border-left-color: var(--accent-pink); }

    .pill-title {
      font-size: 1rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 4px;
    }

    .pill-text {
      font-size: 0.85rem;
      color: var(--text-muted);
      line-height: 1.4;
    }

    /* 数据指标条 */
    .metrics-bar {
      background: #ffffff;
      border-bottom: 1px solid var(--border-color);
      padding: 30px 0;
    }

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

    .metric-card {
      padding: 12px;
      border-right: 1px solid var(--border-color);
    }

    .metric-card:last-child {
      border-right: none;
    }

    .metric-num {
      font-size: 2rem;
      font-weight: 900;
      color: var(--primary);
      line-height: 1.1;
      margin-bottom: 6px;
    }

    .metric-label {
      font-size: 0.9rem;
      font-weight: 700;
      color: var(--text-muted);
    }

    /* 通用Section布局 */
    .section-block {
      padding: 60px 0;
      border-bottom: 1px solid var(--border-color);
    }

    .section-block.bg-alt {
      background-color: var(--bg-alt);
    }

    .section-header {
      text-align: center;
      margin-bottom: 40px;
    }

    .section-tag {
      display: inline-block;
      padding: 4px 12px;
      background: #eef2ff;
      color: var(--primary);
      font-size: 0.82rem;
      font-weight: 800;
      border-radius: 4px;
      margin-bottom: 10px;
      text-transform: uppercase;
      letter-spacing: 0.5px;
    }

    .section-title {
      font-size: 1.85rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 12px;
      line-height: 1.3;
    }

    .section-subtitle {
      font-size: 1rem;
      color: var(--text-muted);
      max-width: 680px;
      margin: 0 auto;
    }

    /* 多模型生态矩阵 */
    .model-chips-container {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-bottom: 30px;
    }

    .model-chip {
      background: #ffffff;
      border: 1px solid var(--border-color);
      padding: 6px 14px;
      border-radius: 30px;
      font-size: 0.85rem;
      font-weight: 700;
      color: var(--text-main);
      box-shadow: 0 1px 2px rgba(0,0,0,0.04);
      transition: var(--transition);
    }

    .model-chip:hover {
      border-color: var(--primary);
      color: var(--primary);
      transform: translateY(-2px);
    }

    /* 卡片网格 */
    .card-grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

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

    .card-grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }

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

    .feature-card:hover {
      box-shadow: var(--shadow-lg);
      transform: translateY(-3px);
      border-color: #cbd5e1;
    }

    .card-badge {
      display: inline-block;
      align-self: flex-start;
      padding: 3px 8px;
      font-size: 0.75rem;
      font-weight: 700;
      border-radius: 4px;
      margin-bottom: 12px;
    }

    .card-title {
      font-size: 1.15rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 10px;
    }

    .card-text {
      font-size: 0.9rem;
      color: var(--text-muted);
      line-height: 1.55;
      margin-bottom: 16px;
    }

    .card-footer-info {
      font-size: 0.8rem;
      font-weight: 700;
      color: var(--primary);
      border-top: 1px dashed var(--border-color);
      padding-top: 12px;
    }

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

    .media-case-card:hover {
      box-shadow: var(--shadow-lg);
      transform: translateY(-3px);
    }

    .case-image-wrapper {
      width: 100%;
      background: #f1f5f9;
      display: flex;
      align-items: center;
      justify-content: center;
      overflow: hidden;
    }

    .case-image-wrapper img {
      width: 100%;
      height: auto;
      object-fit: cover;
      display: block;
    }

    .case-content-box {
      padding: 20px;
    }

    .case-title {
      font-size: 1.1rem;
      font-weight: 800;
      margin-bottom: 8px;
    }

    .case-desc {
      font-size: 0.88rem;
      color: var(--text-muted);
      line-height: 1.5;
    }

    /* 宣传图画廊展示 */
    .banner-gallery-wrapper {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 16px;
      margin-top: 30px;
    }

    .banner-gallery-item {
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border-color);
      background: #ffffff;
      box-shadow: var(--shadow-sm);
    }

    .banner-gallery-item img {
      width: 100%;
      height: auto;
      display: block;
    }

    /* 流程步骤 */
    .step-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
    }

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

    .step-num {
      width: 36px;
      height: 36px;
      background: var(--primary);
      color: #ffffff;
      font-weight: 800;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 12px;
    }

    /* 对比评测板块 */
    .eval-highlight-box {
      background: linear-gradient(135deg, #1e1b4b 0%, #312e81 100%);
      color: #ffffff;
      border-radius: var(--radius-lg);
      padding: 30px;
      margin-bottom: 30px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 20px;
    }

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

    .score-big {
      font-size: 3.5rem;
      font-weight: 900;
      color: #fbbf24;
      line-height: 1;
    }

    .score-detail h4 {
      font-size: 1.3rem;
      font-weight: 800;
      margin-bottom: 4px;
    }

    .score-stars {
      color: #fbbf24;
      font-size: 1.2rem;
      letter-spacing: 2px;
    }

    .eval-summary-text {
      max-width: 550px;
      font-size: 0.95rem;
      color: #e2e8f0;
      line-height: 1.6;
    }

    .table-container {
      width: 100%;
      overflow-x: auto;
      background: #ffffff;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

    .eval-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      font-size: 0.92rem;
    }

    .eval-table th, .eval-table td {
      padding: 14px 18px;
      border-bottom: 1px solid var(--border-color);
    }

    .eval-table th {
      background: #f8fafc;
      font-weight: 800;
      color: var(--text-main);
    }

    .eval-table tr:hover td {
      background: #f1f5f9;
    }

    .col-highlight {
      background: #eef2ff !important;
      font-weight: 700;
      color: var(--primary);
    }

    /* 客户评论 */
    .review-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }

    .review-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 20px;
      box-shadow: var(--shadow-sm);
    }

    .review-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: 12px;
      border-bottom: 1px solid var(--border-color);
      padding-bottom: 10px;
    }

    .reviewer-info h5 {
      font-size: 0.95rem;
      font-weight: 800;
      color: var(--text-main);
    }

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

    .review-rating {
      color: #f59e0b;
      font-size: 0.85rem;
    }

    .review-quote {
      font-size: 0.88rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* FAQ 折叠面板 */
    .faq-list {
      max-width: 900px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

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

    .faq-item.active {
      border-color: var(--primary);
    }

    .faq-question {
      padding: 16px 20px;
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: space-between;
      font-weight: 800;
      font-size: 0.98rem;
      color: var(--text-main);
      background: #ffffff;
    }

    .faq-question:hover {
      background: #f8fafc;
      color: var(--primary);
    }

    .faq-icon {
      font-size: 1.2rem;
      font-weight: 400;
      transition: transform 0.25s ease;
    }

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

    .faq-answer {
      display: none;
      padding: 0 20px 16px 20px;
      font-size: 0.9rem;
      color: var(--text-muted);
      line-height: 1.6;
      border-top: 1px dashed var(--border-color);
      background: #fafafa;
    }

    .faq-item.active .faq-answer {
      display: block;
    }

    /* 表单与需求匹配 */
    .form-wrapper {
      max-width: 800px;
      margin: 0 auto;
      background: #ffffff;
      border: 2px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 36px;
      box-shadow: var(--shadow-md);
    }

    .form-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 18px;
      margin-bottom: 18px;
    }

    .form-group-full {
      grid-column: span 2;
    }

    .form-label {
      display: block;
      font-size: 0.88rem;
      font-weight: 700;
      margin-bottom: 6px;
      color: var(--text-main);
    }

    .form-control {
      width: 100%;
      padding: 11px 14px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      font-size: 0.92rem;
      background: #f8fafc;
      color: var(--text-main);
      outline: none;
      transition: var(--transition);
    }

    .form-control:focus {
      border-color: var(--primary);
      background: #ffffff;
      box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.15);
    }

    textarea.form-control {
      min-height: 110px;
      resize: vertical;
    }

    .btn-submit-form {
      width: 100%;
      padding: 14px;
      background: var(--primary);
      color: #ffffff;
      border: none;
      border-radius: var(--radius-md);
      font-size: 1.05rem;
      font-weight: 800;
      cursor: pointer;
      transition: var(--transition);
      box-shadow: var(--shadow-accent);
    }

    .btn-submit-form:hover {
      background: var(--primary-hover);
    }

    /* 最新文章与资讯 */
    .article-section-wrapper {
      display: grid;
      grid-template-columns: 2fr 1fr;
      gap: 24px;
    }

    .article-links-box {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 20px;
    }

    .article-link-item {
      display: block;
      padding: 10px 0;
      border-bottom: 1px solid var(--border-color);
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--text-muted);
    }

    .article-link-item:last-child {
      border-bottom: none;
    }

    .article-link-item:hover {
      color: var(--primary);
      padding-left: 6px;
    }

    /* 底部 Footer 必须浅底深字对齐规则 */
    .site-footer {
      background: #ffffff;
      color: var(--text-main);
      border-top: 2px solid var(--border-color);
      padding: 50px 0 24px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
      gap: 30px;
      margin-bottom: 40px;
    }

    .footer-brand-title {
      font-size: 1.2rem;
      font-weight: 900;
      color: var(--primary);
      margin-bottom: 10px;
    }

    .footer-desc {
      font-size: 0.88rem;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 16px;
    }

    .footer-heading {
      font-size: 1rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 16px;
      border-left: 3px solid var(--primary);
      padding-left: 8px;
    }

    .footer-list li {
      margin-bottom: 8px;
      font-size: 0.88rem;
      color: var(--text-muted);
    }

    .footer-list a:hover {
      color: var(--primary);
    }

    .footer-qr-card {
      display: flex;
      align-items: center;
      gap: 12px;
      background: var(--bg-alt);
      padding: 12px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
    }

    .footer-qr-card img {
      width: 80px;
      height: 80px;
      object-fit: cover;
      border-radius: 4px;
      border: 1px solid var(--border-color);
    }

    .footer-qr-text {
      font-size: 0.8rem;
      color: var(--text-muted);
      line-height: 1.4;
    }

    .footer-bottom-bar {
      border-top: 1px solid var(--border-color);
      padding-top: 20px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 12px;
      font-size: 0.85rem;
      color: var(--text-light);
    }

    .friend-links-box {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      align-items: center;
    }

    .friend-links-box a {
      color: var(--text-muted);
      font-size: 0.85rem;
    }

    .friend-links-box a:hover {
      color: var(--primary);
    }

    /* 浮动组件与返回顶部 */
    .float-dock {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 990;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .dock-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: #ffffff;
      border: 2px solid var(--border-color);
      box-shadow: var(--shadow-md);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 0.75rem;
      font-weight: 800;
      color: var(--primary);
      cursor: pointer;
      transition: var(--transition);
    }

    .dock-btn:hover {
      background: var(--primary);
      color: #ffffff;
      border-color: var(--primary);
      transform: scale(1.05);
    }

    .dock-qr-popup {
      display: none;
      position: absolute;
      right: 60px;
      bottom: 0;
      background: #ffffff;
      padding: 12px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-lg);
      width: 140px;
      text-align: center;
    }

    .dock-qr-popup img {
      width: 110px;
      height: 110px;
      display: block;
      margin: 0 auto 6px;
    }

    .dock-qr-popup span {
      font-size: 0.75rem;
      color: var(--text-muted);
    }

    .dock-qr-wrap:hover .dock-qr-popup {
      display: block;
    }

    /* 响应式调整 */
    @media (max-width: 992px) {
      .card-grid-4 { grid-template-columns: repeat(2, 1fr); }
      .card-grid-3 { grid-template-columns: repeat(2, 1fr); }
      .step-grid { grid-template-columns: repeat(2, 1fr); }
      .metrics-grid { grid-template-columns: repeat(2, 1fr); }
      .footer-grid { grid-template-columns: repeat(2, 1fr); }
      .article-section-wrapper { grid-template-columns: 1fr; }
      .banner-gallery-wrapper { grid-template-columns: 1fr; }
    }

    @media (max-width: 768px) {
      .mobile-menu-btn { display: block; }
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #ffffff;
        flex-direction: column;
        padding: 16px;
        border-bottom: 2px solid var(--border-color);
        box-shadow: var(--shadow-md);
        gap: 0;
      }
      .nav-links.show { display: flex; }
      .nav-links a { width: 100%; padding: 10px; }
      .hero-title { font-size: 1.7rem; }
      .card-grid-3, .card-grid-2, .review-grid { grid-template-columns: 1fr; }
      .form-grid { grid-template-columns: 1fr; }
      .form-group-full { grid-column: span 1; }
      .footer-grid { grid-template-columns: 1fr; }
      .eval-highlight-box { flex-direction: column; align-items: flex-start; }
      .metric-card { border-right: none; border-bottom: 1px solid var(--border-color); }
    }