:root {
      --bg-main: #f8fafc;
      --bg-card: #ffffff;
      --text-main: #0f172a;
      --text-muted: #475569;
      --primary: #06b6d4;
      --secondary: #8b5cf6;
      --accent: #10b981;
      --neon-glow: 0 0 20px rgba(6, 182, 212, 0.25);
      --border-color: rgba(226, 232, 240, 0.8);
      --container-max: 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-main);
      color: var(--text-main);
      line-height: 1.6;
      background-image: 
        radial-gradient(circle at 10% 20%, rgba(6, 182, 212, 0.04) 0%, transparent 40%),
        radial-gradient(circle at 90% 80%, rgba(139, 92, 246, 0.04) 0%, transparent 40%);
      background-attachment: fixed;
    }
    a {
      color: inherit;
      text-decoration: none;
      transition: all 0.25s ease;
    }
    .container {
      width: 100%;
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 20px;
    }
    /* 顶部导航 */
    .header-nav {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: 0 2px 10px rgba(0, 0, 0, 0.03);
    }
    .nav-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .logo-box {
      display: flex;
      align-items: center;
      max-width: 180px;
    }
    .logo-box img {
      max-height: 48px;
      width: auto;
      object-fit: contain;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
    }
    .nav-links a {
      padding: 8px 12px;
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--text-muted);
      border-radius: 6px;
    }
    .nav-links a:hover {
      color: var(--primary);
      background: rgba(6, 182, 212, 0.06);
    }
    .nav-actions {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .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: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .btn-primary {
      background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
      color: #ffffff;
      box-shadow: 0 4px 14px rgba(6, 182, 212, 0.35);
    }
    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(139, 92, 246, 0.45);
      color: #ffffff;
    }
    .btn-outline {
      border-color: var(--primary);
      color: var(--primary);
      background: transparent;
    }
    .btn-outline:hover {
      background: rgba(6, 182, 212, 0.08);
      transform: translateY(-2px);
    }
    /* 移动端菜单按钮 */
    .mobile-menu-toggle {
      display: none;
      background: none;
      border: none;
      cursor: pointer;
      padding: 8px;
    }
    .mobile-menu-toggle span {
      display: block;
      width: 24px;
      height: 2px;
      background: var(--text-main);
      margin: 5px 0;
      transition: 0.3s;
    }
    /* 通用Section */
    .section-block {
      padding: 70px 0;
      position: relative;
    }
    .section-header {
      text-align: center;
      max-width: 800px;
      margin: 0 auto 48px;
    }
    .section-badge {
      display: inline-block;
      padding: 4px 14px;
      font-size: 0.8rem;
      font-weight: 700;
      color: var(--primary);
      background: rgba(6, 182, 212, 0.1);
      border-radius: 20px;
      margin-bottom: 12px;
      letter-spacing: 1px;
      border: 1px solid rgba(6, 182, 212, 0.2);
    }
    .section-title {
      font-size: 2rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 14px;
      line-height: 1.3;
    }
    .section-desc {
      font-size: 1.05rem;
      color: var(--text-muted);
    }
    /* Hero首屏（无图片，纯CSS动效与排版） */
    .hero-section {
      padding: 90px 0 70px;
      text-align: center;
      background: linear-gradient(180deg, rgba(255, 255, 255, 0.8) 0%, rgba(241, 245, 249, 0.8) 100%);
      border-bottom: 1px solid var(--border-color);
      position: relative;
      overflow: hidden;
    }
    .hero-h1 {
      font-size: 2.5rem;
      font-weight: 900;
      line-height: 1.25;
      margin-bottom: 20px;
      background: linear-gradient(135deg, #0f172a 30%, #06b6d4 70%, #8b5cf6 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .hero-sub {
      font-size: 1.15rem;
      color: var(--text-muted);
      max-width: 760px;
      margin: 0 auto 36px;
    }
    .hero-btn-group {
      display: flex;
      justify-content: center;
      gap: 16px;
      margin-bottom: 50px;
      flex-wrap: wrap;
    }
    .hero-highlight-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      margin-top: 20px;
    }
    .stat-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: 12px;
      padding: 24px 16px;
      box-shadow: 0 4px 20px rgba(0, 0, 0, 0.03);
      transition: all 0.3s ease;
      position: relative;
      overflow: hidden;
    }
    .stat-card::before {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      height: 3px;
      background: linear-gradient(90deg, var(--primary), var(--secondary));
    }
    .stat-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--neon-glow);
    }
    .stat-num {
      font-size: 2rem;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 6px;
    }
    .stat-label {
      font-size: 0.9rem;
      color: var(--text-muted);
      font-weight: 500;
    }
    /* 卡片网格通用 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 30px;
    }
    .feature-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: 14px;
      padding: 28px;
      transition: all 0.3s ease;
      display: flex;
      flex-direction: column;
      height: 100%;
    }
    .feature-card:hover {
      transform: translateY(-4px);
      box-shadow: 0 12px 30px rgba(6, 182, 212, 0.12);
      border-color: rgba(6, 182, 212, 0.4);
    }
    .feature-icon {
      width: 48px;
      height: 48px;
      border-radius: 10px;
      background: linear-gradient(135deg, rgba(6, 182, 212, 0.15), rgba(139, 92, 246, 0.15));
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary);
      font-size: 1.4rem;
      margin-bottom: 20px;
    }
    .feature-card h3 {
      font-size: 1.2rem;
      margin-bottom: 12px;
      color: var(--text-main);
    }
    .feature-card p {
      font-size: 0.95rem;
      color: var(--text-muted);
      flex-grow: 1;
    }
    /* 媒体与展示图片排版 */
    .media-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: 14px;
      overflow: hidden;
      box-shadow: 0 4px 15px rgba(0,0,0,0.03);
      transition: 0.3s ease;
    }
    .media-card:hover {
      transform: translateY(-4px);
      box-shadow: 0 10px 25px rgba(0,0,0,0.08);
    }
    .img-box {
      width: 100%;
      background: #e2e8f0;
      position: relative;
    }
    .img-box img {
      width: 100%;
      height: auto;
      display: block;
      object-fit: cover;
    }
    .media-body {
      padding: 20px;
    }
    .media-body h4 {
      font-size: 1.1rem;
      margin-bottom: 8px;
      color: var(--text-main);
    }
    .media-body p {
      font-size: 0.9rem;
      color: var(--text-muted);
    }
    /* 对比表格 */
    .table-container {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: 14px;
      overflow-x: auto;
      box-shadow: 0 4px 20px rgba(0,0,0,0.03);
    }
    .custom-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
    }
    .custom-table th, .custom-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
      font-size: 0.95rem;
    }
    .custom-table th {
      background: #f1f5f9;
      color: var(--text-main);
      font-weight: 700;
    }
    .custom-table tr:last-child td {
      border-bottom: none;
    }
    .highlight-col {
      background: rgba(6, 182, 212, 0.04);
      font-weight: 600;
      color: var(--primary);
    }
    .badge-score {
      display: inline-block;
      padding: 4px 10px;
      background: linear-gradient(135deg, #f59e0b, #ef4444);
      color: #ffffff;
      border-radius: 6px;
      font-weight: bold;
      font-size: 0.85rem;
    }
    /* 流程步骤 */
    .step-item {
      position: relative;
      padding: 24px;
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: 12px;
      height: 100%;
    }
    .step-badge {
      display: inline-block;
      width: 32px;
      height: 32px;
      line-height: 32px;
      text-align: center;
      background: var(--primary);
      color: #fff;
      border-radius: 50%;
      font-weight: bold;
      margin-bottom: 14px;
    }
    /* 标签云与模型生态 */
    .tag-cloud {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      padding: 20px;
      background: var(--bg-card);
      border-radius: 14px;
      border: 1px solid var(--border-color);
    }
    .tag-item {
      padding: 8px 16px;
      background: #f1f5f9;
      color: var(--text-main);
      border-radius: 20px;
      font-size: 0.9rem;
      font-weight: 500;
      border: 1px solid rgba(0,0,0,0.05);
      transition: 0.2s;
    }
    .tag-item:hover {
      background: var(--primary);
      color: #fff;
      border-color: var(--primary);
    }
    /* 评论卡片 */
    .testimonial-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: 14px;
      padding: 24px;
      box-shadow: 0 4px 16px rgba(0,0,0,0.02);
    }
    .testi-header {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 14px;
    }
    .testi-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--primary), var(--secondary));
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: bold;
      font-size: 1.1rem;
    }
    .testi-name {
      font-weight: 700;
      color: var(--text-main);
    }
    .testi-role {
      font-size: 0.8rem;
      color: var(--text-muted);
    }
    .testi-text {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.55;
    }
    /* FAQ 折叠 */
    .faq-wrapper {
      max-width: 900px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }
    .faq-item {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: 10px;
      overflow: hidden;
    }
    .faq-question {
      padding: 18px 24px;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      background: #ffffff;
      transition: background 0.2s;
    }
    .faq-question:hover {
      background: #f8fafc;
    }
    .faq-arrow {
      transition: transform 0.3s;
      font-size: 0.8rem;
      color: var(--primary);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s cubic-bezier(0, 1, 0, 1), padding 0.3s ease;
      padding: 0 24px;
      background: #f8fafc;
      color: var(--text-muted);
      font-size: 0.95rem;
      border-top: 1px solid transparent;
    }
    .faq-item.active .faq-arrow {
      transform: rotate(180deg);
    }
    .faq-item.active .faq-answer {
      max-height: 500px;
      padding: 16px 24px;
      border-top-color: var(--border-color);
    }
    /* 表单组件 */
    .form-container {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: 14px;
      padding: 36px;
      box-shadow: 0 8px 30px rgba(0,0,0,0.04);
      max-width: 760px;
      margin: 0 auto;
    }
    .form-group {
      margin-bottom: 20px;
    }
    .form-label {
      display: block;
      font-size: 0.9rem;
      font-weight: 600;
      margin-bottom: 8px;
      color: var(--text-main);
    }
    .form-control {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid #cbd5e1;
      border-radius: 8px;
      font-size: 0.95rem;
      background: #ffffff;
      outline: none;
      transition: border-color 0.2s;
    }
    .form-control:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(6, 182, 212, 0.15);
    }
    textarea.form-control {
      resize: vertical;
      min-height: 110px;
    }
    /* 最新文章列表 */
    .article-list {
      display: flex;
      flex-direction: column;
      gap: 12px;
    }
    .article-item {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 14px 20px;
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: 8px;
      transition: 0.2s;
    }
    .article-item:hover {
      border-color: var(--primary);
      transform: translateX(4px);
    }
    .article-item a {
      font-weight: 500;
      color: var(--text-main);
    }
    .article-item a:hover {
      color: var(--primary);
    }
    /* 底部Footer */
    .site-footer {
      background: #0f172a;
      color: #94a3b8;
      padding: 60px 0 24px;
      border-top: 1px solid #1e293b;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 40px;
      margin-bottom: 40px;
    }
    .footer-col h4 {
      color: #ffffff;
      font-size: 1.1rem;
      margin-bottom: 18px;
      font-weight: 700;
    }
    .footer-col p {
      font-size: 0.9rem;
      line-height: 1.6;
      margin-bottom: 10px;
    }
    .footer-links {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 8px;
    }
    .footer-links a {
      color: #94a3b8;
      font-size: 0.9rem;
    }
    .footer-links a:hover {
      color: var(--primary);
    }
    .friend-links {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      margin-top: 10px;
    }
    .friend-links a {
      color: #cbd5e1;
      font-size: 0.85rem;
      background: #1e293b;
      padding: 4px 10px;
      border-radius: 4px;
      transition: 0.2s;
    }
    .friend-links a:hover {
      background: var(--primary);
      color: #ffffff;
    }
    .footer-bottom {
      border-top: 1px solid #1e293b;
      padding-top: 24px;
      text-align: center;
      font-size: 0.85rem;
      color: #64748b;
    }
    /* 浮动客服 */
    .floating-contact {
      position: fixed;
      right: 20px;
      bottom: 40px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }
    .float-btn {
      width: 50px;
      height: 50px;
      border-radius: 50%;
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      box-shadow: 0 4px 16px rgba(0,0,0,0.15);
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      position: relative;
      transition: transform 0.2s;
    }
    .float-btn:hover {
      transform: scale(1.08);
    }
    .float-qr {
      position: absolute;
      right: 60px;
      bottom: 0;
      background: #fff;
      padding: 12px;
      border-radius: 8px;
      box-shadow: 0 8px 24px rgba(0,0,0,0.15);
      border: 1px solid var(--border-color);
      display: none;
      width: 160px;
      text-align: center;
    }
    .float-qr img {
      width: 100%;
      height: auto;
      display: block;
      margin-bottom: 6px;
    }
    .float-btn:hover .float-qr {
      display: block;
    }
    /* 响应式调整 */
    @media (max-width: 992px) {
      .hero-highlight-grid { grid-template-columns: repeat(2, 1fr); }
      .grid-4 { grid-template-columns: repeat(2, 1fr); }
      .grid-3 { grid-template-columns: repeat(2, 1fr); }
      .footer-grid { grid-template-columns: repeat(2, 1fr); }
      .nav-links { display: none; }
      .mobile-menu-toggle { display: block; }
      .nav-links.active {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #ffffff;
        padding: 20px;
        box-shadow: 0 10px 20px rgba(0,0,0,0.1);
        border-bottom: 1px solid var(--border-color);
      }
    }
    @media (max-width: 640px) {
      .hero-h1 { font-size: 1.8rem; }
      .hero-highlight-grid { grid-template-columns: 1fr; }
      .grid-3, .grid-4, .grid-2 { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
    }