:root {
      --primary: #4f46e5;
      --primary-hover: #4338ca;
      --accent-coral: #ff6b6b;
      --accent-cyan: #06b6d4;
      --accent-amber: #f59e0b;
      --accent-emerald: #10b981;
      --accent-purple: #8b5cf6;
      --text-main: #1e293b;
      --text-muted: #475569;
      --bg-page: #f8fafc;
      --bg-card: #ffffff;
      --border-color: #e2e8f0;
      --radius: 12px;
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
      --shadow-md: 0 4px 14px -2px rgba(79, 70, 229, 0.08);
      --shadow-lg: 0 10px 25px -5px rgba(0, 0, 0, 0.08);
    }
    * {
      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-page);
      color: var(--text-main);
      line-height: 1.6;
      overflow-x: hidden;
    }
    a {
      color: inherit;
      text-decoration: none;
    }
    .container {
      width: 100%;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }
    
    /* 顶部导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(10px);
      border-bottom: 1px solid var(--border-color);
    }
    .nav-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 70px;
    }
    .brand-box {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .brand-box img {
      max-height: 40px;
      width: auto;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
      list-style: none;
    }
    .nav-links li a {
      padding: 8px 12px;
      font-size: 0.92rem;
      font-weight: 500;
      color: var(--text-muted);
      transition: color 0.2s, background 0.2s;
      border-radius: 6px;
    }
    .nav-links li a:hover {
      color: var(--primary);
      background: #f1f5f9;
    }
    .nav-action {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .btn-portal {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 8px 18px;
      background: linear-gradient(135deg, var(--primary), var(--accent-purple));
      color: #ffffff !important;
      border-radius: 8px;
      font-weight: 600;
      font-size: 0.9rem;
      box-shadow: 0 4px 12px rgba(79, 70, 229, 0.25);
      transition: transform 0.2s, box-shadow 0.2s;
    }
    .btn-portal:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 16px rgba(79, 70, 229, 0.35);
    }
    .menu-toggle {
      display: none;
      background: none;
      border: 1px solid var(--border-color);
      padding: 6px 10px;
      border-radius: 6px;
      font-size: 1.2rem;
      cursor: pointer;
    }

    /* 区域通用规范 */
    .section-wrap {
      padding: 64px 0;
      position: relative;
    }
    .section-header {
      text-align: center;
      margin-bottom: 44px;
    }
    .section-tag {
      display: inline-block;
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 0.82rem;
      font-weight: 600;
      margin-bottom: 12px;
    }
    .tag-blue { background: #e0e7ff; color: #3730a3; }
    .tag-coral { background: #fee2e2; color: #991b1b; }
    .tag-emerald { background: #d1fae5; color: #065f46; }
    .tag-purple { background: #ede9fe; color: #5b21b6; }
    .tag-amber { background: #fef3c7; color: #92400e; }
    .section-title {
      font-size: 2rem;
      font-weight: 700;
      color: var(--text-main);
      letter-spacing: -0.5px;
    }
    .section-desc {
      margin-top: 8px;
      color: var(--text-muted);
      font-size: 1rem;
      max-width: 680px;
      margin-left: auto;
      margin-right: auto;
    }

    /* 首屏 Hero */
    .hero-section {
      padding: 70px 0 50px 0;
      background: linear-gradient(180deg, #eef2ff 0%, #ffffff 100%);
      border-bottom: 1px solid var(--border-color);
    }
    .hero-content {
      text-align: center;
      max-width: 860px;
      margin: 0 auto;
    }
    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      background: #e0e7ff;
      color: var(--primary);
      padding: 6px 16px;
      border-radius: 30px;
      font-size: 0.88rem;
      font-weight: 600;
      margin-bottom: 20px;
      border: 1px solid #c7d2fe;
    }
    .hero-title {
      font-size: 2.5rem;
      font-weight: 800;
      line-height: 1.25;
      color: #0f172a;
      margin-bottom: 20px;
    }
    .hero-title span {
      background: linear-gradient(135deg, var(--primary), var(--accent-coral));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .hero-p {
      font-size: 1.15rem;
      color: var(--text-muted);
      margin-bottom: 32px;
      line-height: 1.7;
    }
    .hero-actions {
      display: flex;
      justify-content: center;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 40px;
    }
    .btn-main {
      padding: 12px 28px;
      border-radius: 8px;
      font-size: 1rem;
      font-weight: 600;
      background: var(--primary);
      color: #fff;
      transition: 0.2s ease;
      box-shadow: 0 4px 14px rgba(79, 70, 229, 0.3);
    }
    .btn-main:hover {
      background: var(--primary-hover);
      transform: translateY(-2px);
    }
    .btn-secondary {
      padding: 12px 28px;
      border-radius: 8px;
      font-size: 1rem;
      font-weight: 600;
      background: #fff;
      color: var(--text-main);
      border: 1px solid var(--border-color);
      transition: 0.2s ease;
    }
    .btn-secondary:hover {
      background: #f8fafc;
      border-color: #cbd5e1;
    }
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
      margin-top: 30px;
    }
    .stat-card {
      background: #ffffff;
      padding: 20px;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }
    .stat-value {
      font-size: 1.8rem;
      font-weight: 700;
      color: var(--primary);
    }
    .stat-label {
      font-size: 0.88rem;
      color: var(--text-muted);
      margin-top: 4px;
    }

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

    /* 通用卡片 */
    .feature-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 24px;
      transition: transform 0.2s, box-shadow 0.2s, border-color 0.2s;
    }
    .feature-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: #cbd5e1;
    }
    .card-icon {
      width: 44px;
      height: 44px;
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.25rem;
      margin-bottom: 16px;
      font-weight: bold;
    }
    .icon-blue { background: #e0e7ff; color: var(--primary); }
    .icon-coral { background: #fee2e2; color: var(--accent-coral); }
    .icon-cyan { background: #cffafe; color: var(--accent-cyan); }
    .icon-amber { background: #fef3c7; color: var(--accent-amber); }
    .icon-purple { background: #ede9fe; color: var(--accent-purple); }
    .icon-emerald { background: #d1fae5; color: var(--accent-emerald); }

    .feature-card h3 {
      font-size: 1.15rem;
      font-weight: 600;
      margin-bottom: 8px;
      color: var(--text-main);
    }
    .feature-card p {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 支持大模型标签云 */
    .model-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-top: 24px;
    }
    .model-badge {
      background: #ffffff;
      border: 1px solid #cbd5e1;
      padding: 6px 14px;
      border-radius: 6px;
      font-size: 0.85rem;
      font-weight: 500;
      color: #334155;
      transition: background 0.2s;
    }
    .model-badge:hover {
      background: #f1f5f9;
      border-color: var(--primary);
    }

    /* 流程与步骤 */
    .timeline {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .step-box {
      background: #fff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 24px;
      position: relative;
    }
    .step-number {
      font-size: 1.5rem;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 8px;
      opacity: 0.8;
    }

    /* 案例展示区（带图片） */
    .media-card {
      background: #fff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      overflow: hidden;
      display: flex;
      flex-direction: column;
    }
    .media-img-wrap {
      width: 100%;
      aspect-ratio: 16/9;
      background: #f1f5f9;
      overflow: hidden;
    }
    .media-img-wrap.square {
      aspect-ratio: 1/1;
    }
    .media-img-wrap img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      display: block;
      transition: transform 0.3s;
    }
    .media-card:hover .media-img-wrap img {
      transform: scale(1.03);
    }
    .media-info {
      padding: 20px;
      flex: 1;
    }
    .media-info h3 {
      font-size: 1.1rem;
      font-weight: 600;
      margin-bottom: 6px;
    }
    .media-info p {
      font-size: 0.88rem;
      color: var(--text-muted);
    }

    /* 对比表格 */
    .compare-container {
      background: #fff;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      overflow-x: auto;
      box-shadow: var(--shadow-sm);
    }
    .compare-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 600px;
    }
    .compare-table th, .compare-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
      font-size: 0.92rem;
    }
    .compare-table th {
      background: #f8fafc;
      color: var(--text-main);
      font-weight: 600;
    }
    .compare-table tr:last-child td {
      border-bottom: none;
    }
    .highlight-col {
      background: #f5f3ff;
      color: var(--primary);
      font-weight: 600;
    }
    .rating-box {
      background: linear-gradient(135deg, #4f46e5, #7c3aed);
      color: #fff;
      padding: 24px;
      border-radius: var(--radius);
      margin-top: 24px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 16px;
    }
    .rating-val {
      font-size: 2.2rem;
      font-weight: 800;
      color: #fde047;
    }

    /* 用户评论 */
    .testimonial-card {
      background: #fff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 24px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .testimonial-text {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 16px;
    }
    .user-profile {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid #f1f5f9;
      padding-top: 12px;
    }
    .avatar-char {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      background: #e0e7ff;
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1rem;
    }
    .user-meta h4 {
      font-size: 0.92rem;
      font-weight: 600;
      color: var(--text-main);
    }
    .user-meta span {
      font-size: 0.8rem;
      color: #64748b;
    }

    /* FAQ 展开面板 */
    .faq-list {
      display: flex;
      flex-direction: column;
      gap: 12px;
      max-width: 860px;
      margin: 0 auto;
    }
    .faq-item {
      background: #fff;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      overflow: hidden;
    }
    .faq-question {
      width: 100%;
      text-align: left;
      padding: 16px 20px;
      background: none;
      border: none;
      font-size: 1rem;
      font-weight: 600;
      color: var(--text-main);
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
    }
    .faq-question:hover {
      background: #f8fafc;
    }
    .faq-answer {
      display: none;
      padding: 0 20px 16px 20px;
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.6;
      border-top: 1px solid #f1f5f9;
    }
    .faq-item.active .faq-answer {
      display: block;
    }
    .faq-icon {
      font-size: 1.2rem;
      color: var(--primary);
      transition: transform 0.2s;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }

    /* 表单与联系区 */
    .contact-wrapper {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
      background: #fff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 32px;
    }
    .form-group {
      margin-bottom: 16px;
    }
    .form-label {
      display: block;
      font-size: 0.88rem;
      font-weight: 600;
      margin-bottom: 6px;
      color: var(--text-main);
    }
    .form-input, .form-select, .form-textarea {
      width: 100%;
      padding: 10px 14px;
      border: 1px solid var(--border-color);
      border-radius: 6px;
      font-size: 0.92rem;
      outline: none;
      transition: border-color 0.2s;
    }
    .form-input:focus, .form-select:focus, .form-textarea:focus {
      border-color: var(--primary);
    }
    .contact-info-block {
      display: flex;
      flex-direction: column;
      gap: 20px;
    }
    .contact-card {
      background: #f8fafc;
      padding: 20px;
      border-radius: 8px;
      border: 1px solid var(--border-color);
    }
    .qr-container {
      display: flex;
      align-items: center;
      gap: 16px;
      margin-top: 12px;
    }
    .qr-container img {
      width: 90px;
      height: 90px;
      border: 1px solid #cbd5e1;
      border-radius: 6px;
      background: #fff;
    }

    /* 行业资讯/文章列表 */
    .article-list {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 16px;
    }
    .article-item {
      background: #fff;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      padding: 16px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      transition: border-color 0.2s;
    }
    .article-item:hover {
      border-color: var(--primary);
    }
    .article-title {
      font-size: 0.95rem;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 8px;
    }
    .article-meta {
      font-size: 0.8rem;
      color: #94a3b8;
    }

    /* 页脚 */
    .site-footer {
      background: #0f172a;
      color: #94a3b8;
      padding: 50px 0 24px 0;
      border-top: 1px solid #1e293b;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 32px;
      margin-bottom: 40px;
    }
    .footer-col h4 {
      color: #ffffff;
      font-size: 1rem;
      font-weight: 600;
      margin-bottom: 16px;
    }
    .footer-links {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .footer-links a {
      color: #94a3b8;
      font-size: 0.88rem;
      transition: color 0.2s;
    }
    .footer-links a:hover {
      color: #ffffff;
    }
    .friend-links {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 10px;
    }
    .friend-links a {
      color: #64748b;
      font-size: 0.85rem;
      background: #1e293b;
      padding: 4px 10px;
      border-radius: 4px;
      transition: color 0.2s, background 0.2s;
    }
    .friend-links a:hover {
      color: #ffffff;
      background: #334155;
    }
    .footer-bottom {
      border-top: 1px solid #1e293b;
      padding-top: 24px;
      text-align: center;
      font-size: 0.85rem;
      color: #64748b;
    }

    /* 悬浮客服 */
    .float-widget {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .float-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: var(--primary);
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: var(--shadow-lg);
      cursor: pointer;
      border: none;
      font-size: 1.2rem;
      position: relative;
    }
    .float-panel {
      position: absolute;
      right: 60px;
      bottom: 0;
      background: #fff;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      padding: 16px;
      width: 180px;
      box-shadow: var(--shadow-lg);
      display: none;
      text-align: center;
      color: var(--text-main);
    }
    .float-panel img {
      width: 100%;
      height: auto;
      border-radius: 4px;
      margin-bottom: 8px;
    }
    .float-btn:hover .float-panel {
      display: block;
    }

    /* 响应式断点 */
    @media (max-width: 1024px) {
      .grid-4, .timeline { grid-template-columns: repeat(2, 1fr); }
      .grid-3 { grid-template-columns: repeat(2, 1fr); }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 768px) {
      .menu-toggle { display: block; }
      .nav-links {
        display: none;
        position: absolute;
        top: 70px;
        left: 0;
        right: 0;
        background: #fff;
        flex-direction: column;
        padding: 16px;
        border-bottom: 1px solid var(--border-color);
      }
      .nav-links.show { display: flex; }
      .hero-title { font-size: 1.85rem; }
      .grid-2, .grid-3, .grid-4, .timeline, .stats-grid, .contact-wrapper {
        grid-template-columns: 1fr;
      }
      .footer-grid { grid-template-columns: 1fr; }
    }