:root {
      --bg-main: #f8fafc;
      --bg-card: #ffffff;
      --text-main: #0f172a;
      --text-muted: #475569;
      --primary-cyan: #06b6d4;
      --primary-purple: #8b5cf6;
      --primary-pink: #ec4899;
      --neon-glow: 0 10px 30px -10px rgba(139, 92, 246, 0.3);
      --border-color: #e2e8f0;
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
    }

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    html {
      scroll-behavior: smooth;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    }

    body {
      background-color: var(--bg-main);
      color: var(--text-main);
      line-height: 1.6;
      overflow-x: hidden;
    }

    .site-container {
      max-width: 1240px;
      margin: 0 auto;
      padding: 0 20px;
    }

    /* 顶部导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: 0 2px 10px rgba(0,0,0,0.03);
    }

    .nav-wrapper {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 70px;
    }

    .logo-box {
      display: flex;
      align-items: center;
      gap: 12px;
      text-decoration: none;
    }

    .logo-box .ai-page-logo {
      height: 38px;
      width: auto;
      object-fit: contain;
    }

    .logo-text {
      font-size: 20px;
      font-weight: 800;
      color: var(--text-main);
      letter-spacing: -0.5px;
    }

    .nav-links {
      display: flex;
      align-items: center;
      list-style: none;
      gap: 0;
    }

    .nav-links a {
      color: var(--text-muted);
      text-decoration: none;
      font-weight: 500;
      font-size: 14px;
      padding: 8px 12px;
      border-radius: var(--radius-sm);
      transition: all 0.25s ease;
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary-purple);
      background: rgba(139, 92, 246, 0.08);
    }

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      font-size: 14px;
      font-weight: 600;
      border-radius: 50px;
      text-decoration: none;
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
      cursor: pointer;
      border: 1px solid transparent;
    }

    .btn-neon {
      background: linear-gradient(135deg, #06b6d4, #8b5cf6 50%, #ec4899);
      color: #ffffff;
      box-shadow: 0 4px 15px rgba(139, 92, 246, 0.35);
    }

    .btn-neon:hover {
      transform: translateY(-2px);
      box-shadow: 0 8px 25px rgba(236, 72, 153, 0.45);
      color: #ffffff;
    }

    .btn-outline {
      background: #ffffff;
      border: 1px solid #cbd5e1;
      color: var(--text-main);
    }

    .btn-outline:hover {
      border-color: var(--primary-purple);
      color: var(--primary-purple);
      background: #f8fafc;
    }

    .mobile-menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      cursor: pointer;
      color: var(--text-main);
    }

    /* 首屏 Hero */
    .hero-section {
      padding: 80px 0 60px;
      position: relative;
      background: radial-gradient(circle at 80% 20%, rgba(6, 182, 212, 0.12), transparent 40%),
                  radial-gradient(circle at 20% 80%, rgba(236, 72, 153, 0.1), transparent 40%);
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1.2fr 0.8fr;
      gap: 40px;
      align-items: center;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 14px;
      background: rgba(139, 92, 246, 0.1);
      border: 1px solid rgba(139, 92, 246, 0.25);
      border-radius: 30px;
      font-size: 13px;
      font-weight: 600;
      color: var(--primary-purple);
      margin-bottom: 20px;
    }

    .hero-title {
      font-size: 38px;
      line-height: 1.25;
      font-weight: 900;
      color: #0f172a;
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }

    .hero-title span {
      background: linear-gradient(135deg, #06b6d4, #8b5cf6, #ec4899);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-desc {
      font-size: 16px;
      color: var(--text-muted);
      margin-bottom: 32px;
      line-height: 1.7;
    }

    .hero-actions {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      margin-bottom: 30px;
    }

    .hero-stats-panel {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 24px;
      box-shadow: 0 10px 30px rgba(0,0,0,0.05);
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 16px;
    }

    .stat-box {
      padding: 16px;
      background: #f8fafc;
      border-radius: var(--radius-md);
      border-left: 4px solid var(--primary-purple);
    }

    .stat-val {
      font-size: 24px;
      font-weight: 800;
      color: #0f172a;
    }

    .stat-label {
      font-size: 12px;
      color: var(--text-muted);
      margin-top: 4px;
    }

    .model-tags-cloud {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      margin-top: 16px;
    }

    .tag-chip {
      font-size: 12px;
      padding: 4px 10px;
      background: #ffffff;
      border: 1px solid #e2e8f0;
      border-radius: 6px;
      color: var(--text-muted);
      font-weight: 500;
    }

    /* 通用Section */
    .section-wrap {
      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: 12px;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 1px;
      color: var(--primary-purple);
      margin-bottom: 8px;
    }

    .section-title {
      font-size: 30px;
      font-weight: 800;
      color: #0f172a;
      margin-bottom: 12px;
    }

    .section-subtitle {
      font-size: 15px;
      color: var(--text-muted);
    }

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

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

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

    .card-item {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      transition: all 0.3s ease;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .card-item:hover {
      transform: translateY(-4px);
      box-shadow: 0 12px 28px rgba(139, 92, 246, 0.12);
      border-color: rgba(139, 92, 246, 0.4);
    }

    .card-icon-title {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 12px;
    }

    .card-badge {
      width: 36px;
      height: 36px;
      border-radius: 8px;
      background: linear-gradient(135deg, rgba(6,182,212,0.15), rgba(139,92,246,0.15));
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      color: var(--primary-purple);
      font-size: 14px;
    }

    .card-title {
      font-size: 17px;
      font-weight: 700;
      color: #0f172a;
    }

    .card-desc {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 14px;
    }

    .card-feature-list {
      list-style: none;
      margin-top: 10px;
      border-top: 1px dashed #f1f5f9;
      padding-top: 10px;
    }

    .card-feature-list li {
      font-size: 12px;
      color: #64748b;
      margin-bottom: 4px;
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .card-feature-list li::before {
      content: "•";
      color: var(--primary-cyan);
      font-weight: bold;
    }

    /* 素材图片展示区 */
    .media-showcase-grid {
      display: grid;
      grid-template-columns: 2fr 1fr;
      gap: 20px;
      align-items: center;
    }

    .media-box {
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: 0 4px 15px rgba(0,0,0,0.04);
      background: #ffffff;
    }

    .media-box img {
      width: 100%;
      height: auto;
      display: block;
      object-fit: cover;
      transition: transform 0.4s ease;
    }

    .media-box:hover img {
      transform: scale(1.02);
    }

    .media-info {
      padding: 16px;
    }

    .media-info h4 {
      font-size: 16px;
      color: #0f172a;
      margin-bottom: 4px;
    }

    .media-info p {
      font-size: 13px;
      color: var(--text-muted);
    }

    .banners-strip {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 16px;
      margin-top: 24px;
    }

    /* 对比评测板块 */
    .eval-score-card {
      background: linear-gradient(135deg, #ffffff, #fdf4ff);
      border: 2px solid rgba(236, 72, 153, 0.3);
      border-radius: var(--radius-lg);
      padding: 30px;
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      justify-content: space-between;
      gap: 24px;
      margin-bottom: 30px;
      box-shadow: 0 8px 25px rgba(236, 72, 153, 0.08);
    }

    .score-badge-huge {
      display: flex;
      align-items: center;
      gap: 16px;
    }

    .score-num {
      font-size: 52px;
      font-weight: 900;
      color: #ec4899;
      line-height: 1;
    }

    .score-stars {
      color: #f59e0b;
      font-size: 20px;
    }

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

    .eval-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      font-size: 14px;
    }

    .eval-table th,
    .eval-table td {
      padding: 16px 20px;
      border-bottom: 1px solid #f1f5f9;
    }

    .eval-table th {
      background: #f8fafc;
      font-weight: 700;
      color: #0f172a;
    }

    .eval-table .highlight {
      background: rgba(139, 92, 246, 0.04);
      font-weight: 600;
      color: var(--primary-purple);
    }

    /* 流程步骤 */
    .flow-steps {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      position: relative;
    }

    .flow-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      text-align: center;
      position: relative;
    }

    .flow-num {
      width: 32px;
      height: 32px;
      line-height: 32px;
      background: var(--primary-purple);
      color: #fff;
      border-radius: 50%;
      font-weight: bold;
      margin: 0 auto 12px;
      font-size: 14px;
    }

    .flow-title {
      font-size: 16px;
      font-weight: 700;
      margin-bottom: 8px;
    }

    .flow-desc {
      font-size: 13px;
      color: var(--text-muted);
    }

    /* 表单区 */
    .form-container {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 36px;
      max-width: 800px;
      margin: 0 auto;
      box-shadow: 0 10px 30px rgba(0,0,0,0.04);
    }

    .form-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
    }

    .form-group {
      display: flex;
      flex-direction: column;
      gap: 6px;
    }

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

    .form-group label {
      font-size: 13px;
      font-weight: 600;
      color: #334155;
    }

    .form-input,
    .form-select,
    .form-textarea {
      width: 100%;
      padding: 10px 14px;
      border: 1px solid #cbd5e1;
      border-radius: var(--radius-sm);
      font-size: 14px;
      color: #0f172a;
      background: #f8fafc;
      transition: border-color 0.2s;
    }

    .form-input:focus,
    .form-select:focus,
    .form-textarea:focus {
      border-color: var(--primary-purple);
      outline: none;
      background: #ffffff;
    }

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

    /* FAQ 折叠面板 */
    .faq-list {
      max-width: 860px;
      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: all 0.2s ease;
    }

    .faq-question {
      padding: 16px 20px;
      font-size: 15px;
      font-weight: 600;
      color: #0f172a;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      user-select: none;
    }

    .faq-question::after {
      content: "+";
      font-size: 18px;
      font-weight: bold;
      color: var(--primary-purple);
      transition: transform 0.2s ease;
    }

    .faq-item.active .faq-question::after {
      content: "−";
      transform: rotate(180deg);
    }

    .faq-answer {
      display: none;
      padding: 0 20px 16px;
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
      border-top: 1px solid #f8fafc;
    }

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

    /* 客户评价 */
    .review-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 20px;
      position: relative;
    }

    .review-user {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 12px;
    }

    .user-avatar-tag {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      background: linear-gradient(135deg, #06b6d4, #8b5cf6);
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: bold;
      font-size: 14px;
    }

    .user-meta h4 {
      font-size: 14px;
      color: #0f172a;
    }

    .user-meta p {
      font-size: 12px;
      color: var(--text-muted);
    }

    .review-content {
      font-size: 13px;
      color: #475569;
      line-height: 1.6;
    }

    /* 文章与友情链接 */
    .article-links, .friend-links-box {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      margin-top: 14px;
    }

    .article-links a, .friend-links-box a {
      font-size: 13px;
      color: var(--text-muted);
      background: #ffffff;
      border: 1px solid var(--border-color);
      padding: 6px 14px;
      border-radius: 6px;
      text-decoration: none;
      transition: all 0.2s ease;
    }

    .article-links a:hover, .friend-links-box a:hover {
      color: var(--primary-purple);
      border-color: var(--primary-purple);
      background: rgba(139, 92, 246, 0.05);
    }

    /* 页脚 */
    .site-footer {
      background: #0f172a;
      color: #94a3b8;
      padding: 60px 0 30px;
      font-size: 13px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 36px;
      margin-bottom: 40px;
    }

    .footer-col h4 {
      color: #ffffff;
      font-size: 15px;
      font-weight: 700;
      margin-bottom: 16px;
    }

    .footer-col p {
      margin-bottom: 8px;
      line-height: 1.6;
    }

    .footer-col ul {
      list-style: none;
    }

    .footer-col ul li {
      margin-bottom: 8px;
    }

    .footer-col ul a {
      color: #94a3b8;
      text-decoration: none;
      transition: color 0.2s;
    }

    .footer-col ul a:hover {
      color: #ffffff;
    }

    .kefu-qr-box {
      background: #1e293b;
      padding: 12px;
      border-radius: var(--radius-md);
      display: inline-block;
      text-align: center;
    }

    .kefu-qr-box img {
      width: 100px;
      height: 100px;
      display: block;
      border-radius: 4px;
      margin: 0 auto 6px;
    }

    .footer-bottom {
      border-top: 1px solid #1e293b;
      padding-top: 24px;
      text-align: center;
      font-size: 12px;
    }

    /* 浮动客服 */
    .float-kefu-trigger {
      position: fixed;
      bottom: 30px;
      right: 30px;
      background: linear-gradient(135deg, #06b6d4, #8b5cf6);
      color: #ffffff;
      width: 50px;
      height: 50px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 6px 20px rgba(139, 92, 246, 0.4);
      cursor: pointer;
      z-index: 999;
      text-decoration: none;
      font-weight: bold;
      font-size: 12px;
      transition: transform 0.2s ease;
    }

    .float-kefu-trigger:hover {
      transform: scale(1.08);
    }

    /* 响应式适配 */
    @media (max-width: 1024px) {
      .cards-grid-4 {
        grid-template-columns: repeat(2, 1fr);
      }
      .cards-grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 768px) {
      .hero-grid {
        grid-template-columns: 1fr;
      }
      .cards-grid-3,
      .cards-grid-4,
      .cards-grid-2,
      .flow-steps,
      .media-showcase-grid,
      .banners-strip {
        grid-template-columns: 1fr;
      }
      .form-grid {
        grid-template-columns: 1fr;
      }
      .form-group.full {
        grid-column: span 1;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .mobile-menu-toggle {
        display: block;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 70px;
        left: 0;
        right: 0;
        background: #ffffff;
        flex-direction: column;
        padding: 20px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: 0 10px 20px rgba(0,0,0,0.05);
      }
      .nav-links.active {
        display: flex;
      }
      .hero-title {
        font-size: 28px;
      }
      .section-title {
        font-size: 24px;
      }
    }