/* 全局 CSS 变量设定 - 镭射幻彩风格 (浅色基底) */
    :root {
      --primary: #6366f1;
      --primary-gradient: linear-gradient(135deg, #6366f1 0%, #a855f7 50%, #ec4899 100%);
      --holo-bg: linear-gradient(120deg, #fdfbfb 0%, #ebedee 100%);
      --holo-card-bg: rgba(255, 255, 255, 0.85);
      --holo-border: linear-gradient(135deg, rgba(99, 102, 241, 0.3), rgba(236, 72, 153, 0.3));
      --holo-glow: 0 10px 30px -5px rgba(168, 85, 247, 0.15);
      --text-main: #0f172a;
      --text-sub: #475569;
      --text-muted: #64748b;
      --bg-main: #f8fafc;
      --bg-card: #ffffff;
      --border-color: #e2e8f0;
      --radius-lg: 16px;
      --radius-md: 10px;
      --container-width: 1200px;
    }

    * {
      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;
      background-color: var(--bg-main);
      color: var(--text-main);
      line-height: 1.6;
    }

    body {
      background: radial-gradient(circle at 10% 10%, rgba(224, 195, 252, 0.3) 0%, rgba(142, 197, 252, 0.2) 50%, rgba(255, 255, 255, 0.8) 100%), var(--bg-main);
      background-attachment: fixed;
      overflow-x: hidden;
    }

    a {
      color: var(--primary);
      text-decoration: none;
      transition: all 0.3s ease;
    }

    a:hover {
      opacity: 0.85;
    }

    .container {
      max-width: var(--container-width);
      margin: 0 auto;
      padding: 0 20px;
    }

    /* 顶部导航栏 */
    header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.9);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(226, 232, 240, 0.8);
      box-shadow: 0 2px 10px rgba(0,0,0,0.03);
    }

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

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

    .ai-page-logo {
      height: 40px;
      width: auto;
    }

    .brand-title {
      font-size: 20px;
      font-weight: 800;
      background: var(--primary-gradient);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    /* 限制要求：.nav-links 的 gap 属性设置为 0 */
    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
      list-style: none;
    }

    .nav-links li a {
      padding: 8px 14px;
      font-size: 14px;
      font-weight: 500;
      color: var(--text-main);
      display: inline-block;
    }

    .nav-links li a:hover {
      color: var(--primary);
      background: rgba(99, 102, 241, 0.06);
      border-radius: 6px;
    }

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

    .btn-glow {
      background: var(--primary-gradient);
      color: #ffffff !important;
      padding: 10px 22px;
      border-radius: 30px;
      font-weight: 600;
      font-size: 14px;
      box-shadow: 0 4px 15px rgba(99, 102, 241, 0.3);
      border: none;
      cursor: pointer;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: transform 0.2s ease, box-shadow 0.2s ease;
    }

    .btn-glow:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(168, 85, 247, 0.4);
    }

    .btn-outline {
      border: 1.5px solid var(--primary);
      color: var(--primary);
      background: transparent;
      padding: 8px 18px;
      border-radius: 30px;
      font-weight: 600;
      font-size: 14px;
    }

    /* 模块通用样式 */
    .section-padding {
      padding: 80px 0;
      border-bottom: 1px solid rgba(226, 232, 240, 0.6);
    }

    .section-header {
      text-align: center;
      margin-bottom: 50px;
    }

    .section-badge {
      display: inline-block;
      padding: 4px 14px;
      background: rgba(99, 102, 241, 0.08);
      color: var(--primary);
      border-radius: 20px;
      font-size: 13px;
      font-weight: 600;
      margin-bottom: 12px;
      border: 1px solid rgba(99, 102, 241, 0.2);
    }

    .section-title {
      font-size: 32px;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 14px;
    }

    .section-desc {
      font-size: 16px;
      color: var(--text-sub);
      max-width: 700px;
      margin: 0 auto;
    }

    /* 首屏 HERO 区域 - 严格限制：不得出现任何图片 */
    .hero-section {
      padding: 100px 0 80px;
      text-align: center;
      position: relative;
      background: radial-gradient(circle at 50% 30%, rgba(168, 85, 247, 0.15), transparent 70%);
    }

    .hero-h1 {
      font-size: 38px;
      font-weight: 900;
      line-height: 1.25;
      margin-bottom: 20px;
      color: var(--text-main);
      letter-spacing: -0.5px;
    }

    .hero-subtitle {
      font-size: 18px;
      color: var(--text-sub);
      max-width: 850px;
      margin: 0 auto 36px;
    }

    .hero-buttons {
      display: flex;
      justify-content: center;
      gap: 16px;
      margin-bottom: 40px;
      flex-wrap: wrap;
    }

    .hero-tags {
      display: flex;
      justify-content: center;
      flex-wrap: wrap;
      gap: 10px;
      max-width: 900px;
      margin: 0 auto;
    }

    .tag-chip {
      background: rgba(255, 255, 255, 0.9);
      border: 1px solid rgba(203, 213, 225, 0.8);
      padding: 6px 14px;
      border-radius: 20px;
      font-size: 13px;
      color: var(--text-sub);
      box-shadow: 0 2px 5px rgba(0,0,0,0.02);
    }

    /* 数据指标卡片 */
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      margin-top: -30px;
    }

    .metric-card {
      background: var(--holo-card-bg);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 24px;
      text-align: center;
      box-shadow: var(--holo-glow);
      transition: transform 0.3s ease;
    }

    .metric-card:hover {
      transform: translateY(-5px);
    }

    .metric-num {
      font-size: 34px;
      font-weight: 800;
      background: var(--primary-gradient);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      margin-bottom: 6px;
    }

    .metric-label {
      font-size: 14px;
      color: var(--text-muted);
    }

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

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

    .holo-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 28px;
      position: relative;
      overflow: hidden;
      transition: all 0.3s ease;
      box-shadow: 0 4px 12px rgba(0,0,0,0.03);
    }

    .holo-card::before {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 4px;
      background: var(--primary-gradient);
      opacity: 0.7;
    }

    .holo-card:hover {
      transform: translateY(-4px);
      box-shadow: 0 12px 24px rgba(99, 102, 241, 0.12);
      border-color: rgba(99, 102, 241, 0.3);
    }

    .card-icon {
      width: 48px;
      height: 48px;
      background: rgba(99, 102, 241, 0.1);
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 22px;
      color: var(--primary);
      margin-bottom: 18px;
    }

    .card-title {
      font-size: 18px;
      font-weight: 700;
      margin-bottom: 10px;
      color: var(--text-main);
    }

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

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

    .step-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 24px;
      position: relative;
    }

    .step-num {
      font-size: 24px;
      font-weight: 900;
      color: var(--primary);
      background: rgba(99, 102, 241, 0.1);
      width: 40px;
      height: 40px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 16px;
    }

    /* 对比表格与评测板块 */
    .rating-banner {
      background: linear-gradient(135deg, rgba(99, 102, 241, 0.08), rgba(236, 72, 153, 0.08));
      border: 1px solid rgba(99, 102, 241, 0.2);
      border-radius: var(--radius-lg);
      padding: 24px 32px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: 30px;
      flex-wrap: wrap;
      gap: 20px;
    }

    .rating-info {
      display: flex;
      align-items: center;
      gap: 20px;
    }

    .score-box {
      font-size: 36px;
      font-weight: 900;
      color: #e11d48;
    }

    .star-box {
      color: #f59e0b;
      font-size: 20px;
    }

    .compare-table-wrapper {
      overflow-x: auto;
      background: #ffffff;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      box-shadow: 0 4px 15px rgba(0,0,0,0.03);
    }

    .compare-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
    }

    .compare-table th, .compare-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
      font-size: 14px;
    }

    .compare-table th {
      background: #f1f5f9;
      font-weight: 700;
      color: var(--text-main);
    }

    .highlight-cell {
      background: rgba(99, 102, 241, 0.04);
      font-weight: 600;
      color: var(--primary);
    }

    /* FAQ 折叠面板 */
    .faq-container {
      max-width: 900px;
      margin: 0 auto;
    }

    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      margin-bottom: 12px;
      overflow: hidden;
      transition: border-color 0.3s;
    }

    .faq-question {
      padding: 18px 24px;
      font-weight: 700;
      font-size: 16px;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      background: #ffffff;
      color: var(--text-main);
    }

    .faq-answer {
      padding: 0 24px 18px;
      color: var(--text-sub);
      font-size: 14px;
      display: none;
      line-height: 1.7;
    }

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

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

    .faq-toggle {
      font-size: 18px;
      color: var(--primary);
      transition: transform 0.3s;
    }

    .faq-item.active .faq-toggle {
      transform: rotate(45deg);
    }

    /* 用户评论卡片 */
    .testimonial-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 24px;
      box-shadow: 0 4px 12px rgba(0,0,0,0.02);
    }

    .user-info {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 14px;
    }

    .avatar-placeholder {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: var(--primary-gradient);
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 16px;
    }

    .user-details h4 {
      font-size: 15px;
      font-weight: 700;
    }

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

    /* 案例展示与文章区 */
    .image-gallery {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }

    .gallery-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: 0 4px 12px rgba(0,0,0,0.04);
    }

    .gallery-img-box {
      width: 100%;
      height: 200px;
      overflow: hidden;
      background: #f1f5f9;
    }

    .ai-page-image {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.3s;
    }

    .gallery-item:hover .ai-page-image {
      transform: scale(1.05);
    }

    .gallery-info {
      padding: 16px;
    }

    .article-list {
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .article-item {
      background: #ffffff;
      padding: 14px 20px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    /* 表单区 */
    .form-wrapper {
      max-width: 700px;
      margin: 0 auto;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 36px;
      box-shadow: 0 10px 30px rgba(0,0,0,0.05);
    }

    .form-group {
      margin-bottom: 20px;
    }

    .form-group label {
      display: block;
      font-weight: 600;
      font-size: 14px;
      margin-bottom: 8px;
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      font-size: 14px;
      background: #f8fafc;
      transition: border 0.3s;
    }

    .form-control:focus {
      outline: none;
      border-color: var(--primary);
      background: #fff;
    }

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

    /* 底部与页脚 */
    footer {
      background: #ffffff;
      border-top: 1px solid var(--border-color);
      padding: 60px 0 30px;
      color: var(--text-sub);
    }

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

    .footer-col h4 {
      color: var(--text-main);
      font-size: 16px;
      margin-bottom: 18px;
      font-weight: 700;
    }

    .footer-links {
      list-style: none;
    }

    .footer-links li {
      margin-bottom: 10px;
    }

    .footer-links a {
      color: var(--text-sub);
      font-size: 14px;
    }

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

    .qr-box {
      text-align: center;
    }

    .qr-box img {
      width: 120px;
      height: 120px;
      border-radius: 8px;
      border: 1px solid var(--border-color);
      margin-bottom: 8px;
    }

    .friend-links-box {
      border-top: 1px solid var(--border-color);
      padding-top: 20px;
      margin-bottom: 20px;
      display: flex;
      flex-wrap: wrap;
      gap: 14px;
      font-size: 13px;
    }

    .copyright {
      text-align: center;
      font-size: 13px;
      color: var(--text-muted);
      border-top: 1px solid #f1f5f9;
      padding-top: 20px;
    }

    /* 浮动客服 */
    .floating-kefu {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      box-shadow: 0 10px 25px rgba(0,0,0,0.15);
      border-radius: 12px;
      padding: 12px;
      text-align: center;
      width: 120px;
    }

    .floating-kefu img {
      width: 90px;
      height: 90px;
      border-radius: 6px;
    }

    .floating-kefu span {
      display: block;
      font-size: 12px;
      font-weight: 600;
      color: var(--text-main);
      margin-top: 4px;
    }

    /* 响应式兼容 */
    @media (max-width: 992px) {
      .grid-3, .grid-4, .metrics-grid, .process-steps, .image-gallery {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
      }
      .grid-3, .grid-4, .metrics-grid, .process-steps, .image-gallery {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .hero-h1 {
        font-size: 26px;
      }
      .rating-banner {
        flex-direction: column;
        text-align: center;
      }
    }