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

      body {
        font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB',
          'Microsoft YaHei', 'Helvetica Neue', Helvetica, Arial, sans-serif;
        background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
        min-height: 100vh;
        display: flex;
        flex-direction: column;
      }

      /* Navigation */
      .navbar {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        height: 60px;
        background: rgba(255, 255, 255, 0.95);
        backdrop-filter: blur(10px);
        box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
        display: flex;
        align-items: center;
        justify-content: space-between;
        padding: 0 40px;
        z-index: 1000;
      }

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

      .navbar-menu {
        display: flex;
        gap: 32px;
      }

      .navbar-menu a {
        color: #333;
        text-decoration: none;
        font-size: 1rem;
        font-weight: 500;
        transition: color 0.3s ease;
        position: relative;
      }

      .navbar-menu a:hover,
      .navbar-menu a.active {
        color: #667eea;
      }

      .navbar-menu a::after {
        content: '';
        position: absolute;
        bottom: -4px;
        left: 0;
        width: 0;
        height: 2px;
        background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
        transition: width 0.3s ease;
      }

      .navbar-menu a:hover::after,
      .navbar-menu a.active::after {
        width: 100%;
      }

      .main-content {
        flex: 1;
        padding: 20px;
        padding-top: 80px;
      }

      .container {
        max-width: 1200px;
        margin: 0 auto;
      }

      /* Header */
      .header {
        text-align: center;
        padding: 40px 20px;
        color: white;
      }

      .header h1 {
        font-size: 3rem;
        font-weight: bold;
        margin-bottom: 10px;
        text-shadow: 2px 2px 4px rgba(0,0,0,0.2);
      }

      .header p {
        font-size: 1.2rem;
        opacity: 0.9;
      }

      /* Services Grid */
      .services-grid {
        display: grid;
        grid-template-columns: repeat(4, 1fr);
        gap: 24px;
        margin-top: 40px;
      }

      /* Service Card */
      .service-card {
        background: white;
        border-radius: 16px;
        padding: 32px 24px;
        box-shadow: 0 10px 40px rgba(0,0,0,0.15);
        transition: transform 0.3s ease, box-shadow 0.3s ease;
        display: flex;
        flex-direction: column;
        min-width: 280px;
      }

      .service-card:hover {
        transform: translateY(-8px);
        box-shadow: 0 20px 60px rgba(0,0,0,0.25);
      }

      .service-card h2 {
        font-size: 1.5rem;
        color: #1a1a1a;
        margin-bottom: 12px;
      }

      .service-card .description {
        color: #666;
        line-height: 1.6;
        margin-bottom: 24px;
        font-size: 0.95rem;
        height: 76px;
        overflow: hidden;
        text-overflow: ellipsis;
      }

      /* Version Links */
      .version-links {
        display: flex;
        flex-wrap: wrap;
        gap: 8px;
        margin-bottom: 20px;
      }

      .version-link {
        padding: 6px 14px;
        background: #f0f0ff;
        color: #667eea;
        border-radius: 20px;
        text-decoration: none;
        font-size: 0.875rem;
        transition: all 0.3s ease;
      }

      .version-link:hover {
        background: #667eea;
        color: white;
      }

      /* Card Footer */
      .card-footer {
        display: flex;
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
        margin-top: auto;
        width: 100%;
      }

      /* Rating */
      .rating {
        display: flex;
        align-items: center;
        gap: 4px;
      }

      .rating-label {
        font-size: 0.875rem;
        color: #888;
      }

      .stars {
        color: #ffc107;
        font-size: 1.2rem;
      }

      /* CTA Button */
      .cta-button {
        width: 100%;
        padding: 12px 20px;
        background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
        color: white;
        border: none;
        border-radius: 12px;
        font-size: 0.9rem;
        font-weight: 600;
        cursor: pointer;
        transition: transform 0.3s ease, box-shadow 0.3s ease;
      }

      .cta-button:hover {
        transform: translateY(-2px);
        box-shadow: 0 8px 25px rgba(102, 126, 234, 0.4);
      }

      /* Footer */
      .footer {
        padding: 40px 20px 80px;
        margin-top: 40px;
      }

      /* Floating Toolbar */
      .floating-toolbar {
        position: fixed;
        right: 20px;
        top: 50%;
        transform: translateY(-50%);
        z-index: 999;
        display: flex;
        flex-direction: column;
        gap: 8px;
      }

      .floating-item {
        width: 56px;
        height: 56px;
        background: white;
        border-radius: 12px;
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 2px;
        cursor: pointer;
        box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
        transition: all 0.3s ease;
        text-decoration: none;
        position: relative;
      }

      .floating-item:hover {
        transform: translateX(-4px);
        box-shadow: 0 8px 30px rgba(0, 0, 0, 0.25);
      }

      .floating-item .icon {
        font-size: 24px;
      }

      .floating-item .label {
        font-size: 10px;
        color: #666;
        white-space: nowrap;
      }

      .floating-item .detail-bubble {
        position: absolute;
        right: calc(100% + 12px);
        top: 50%;
        transform: translateY(-50%);
        background: white;
        border: 1px solid #e0e0e0;
        border-radius: 8px;
        padding: 8px 16px;
        white-space: nowrap;
        font-size: 13px;
        color: #333;
        box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
        opacity: 0;
        visibility: hidden;
        transition: all 0.3s ease;
      }

      .floating-item .detail-bubble::after {
        content: '';
        position: absolute;
        right: -6px;
        top: 50%;
        transform: translateY(-50%);
        width: 0;
        height: 0;
        border-left: 6px solid white;
        border-top: 6px solid transparent;
        border-bottom: 6px solid transparent;
      }

      .floating-item .detail-bubble::before {
        content: '';
        position: absolute;
        right: -7px;
        top: 50%;
        transform: translateY(-50%);
        width: 0;
        height: 0;
        border-left: 6px solid #e0e0e0;
        border-top: 6px solid transparent;
        border-bottom: 6px solid transparent;
      }

      .floating-item:hover .detail-bubble {
        opacity: 1;
        visibility: visible;
      }

      /* WeChat QR Code Bubble */
      .floating-item .qr-bubble {
        position: absolute;
        right: calc(100% + 12px);
        top: 50%;
        transform: translateY(-50%);
        background: white;
        border: 1px solid #e0e0e0;
        border-radius: 12px;
        padding: 12px;
        box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
        opacity: 0;
        visibility: hidden;
        transition: all 0.3s ease;
        text-align: center;
      }

      .floating-item .qr-bubble::after {
        content: '';
        position: absolute;
        right: -6px;
        top: 50%;
        transform: translateY(-50%);
        width: 0;
        height: 0;
        border-left: 6px solid white;
        border-top: 6px solid transparent;
        border-bottom: 6px solid transparent;
      }

      .floating-item:hover .qr-bubble {
        opacity: 1;
        visibility: visible;
      }

      .floating-item .qr-bubble img {
        width: 150px;
        height: 150px;
        border-radius: 8px;
      }

      .floating-item .qr-bubble .qr-text {
        margin-top: 8px;
        font-size: 12px;
        color: #666;
      }

      .floating-item .icon-service { color: #1e88e5; }
      .floating-item .icon-phone { color: #42a5f5; }
      .floating-item .icon-qq { color: #12b7f5; }
      .floating-item .icon-wechat { color: #07c160; }

      /* Back to Top */
      .back-to-top {
        width: 56px;
        height: 56px;
        background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
        border-radius: 12px;
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 2px;
        cursor: pointer;
        box-shadow: 0 4px 20px rgba(102, 126, 234, 0.4);
        transition: all 0.3s ease;
        opacity: 0;
        visibility: hidden;
        border: none;
        margin-top: 8px;
      }

      .back-to-top.visible {
        opacity: 1;
        visibility: visible;
      }

      .back-to-top:hover {
        transform: translateX(-4px);
        box-shadow: 0 8px 30px rgba(102, 126, 234, 0.5);
      }

      .back-to-top .icon {
        font-size: 24px;
      }

      .back-to-top .label {
        font-size: 10px;
        color: white;
        white-space: nowrap;
      }

      /* Footer */
      .footer {
        background: rgba(255, 255, 255, 0.95);
        backdrop-filter: blur(10px);
        margin-top: auto;
        padding: 30px 20px 20px;
        box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.1);
        width: 100%;
      }

      .footer-content {
        max-width: 1200px;
        margin: 0 auto;
        text-align: center;
      }

      .footer-links {
        display: flex;
        justify-content: center;
        flex-wrap: wrap;
        gap: 30px;
        margin-bottom: 20px;
      }

      .footer-links a {
        color: #666;
        text-decoration: none;
        font-size: 0.9rem;
        transition: color 0.3s ease;
      }

      .footer-links a:hover {
        color: #667eea;
      }

      /* Footer Contact */
      .footer-contact {
        display: flex;
        justify-content: center;
        flex-wrap: wrap;
        gap: 30px;
        margin-bottom: 20px;
        padding-bottom: 20px;

      }

      .contact-item {
        display: flex;
        align-items: center;
        gap: 8px;
        color: #666;
        font-size: 0.9rem;
      }

      .contact-item .contact-icon {
        font-size: 1.1rem;
      }

      .contact-item.wechat-contact {
        position: relative;
        cursor: pointer;
      }

      .contact-item.wechat-contact:hover {
        color: #667eea;
      }

      .contact-item .wechat-qr {
        position: absolute;
        bottom: calc(100% + 15px);
        left: 50%;
        transform: translateX(-50%);
        background: white;
        border: 1px solid #e0e0e0;
        border-radius: 12px;
        padding: 12px;
        box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
        opacity: 0;
        visibility: hidden;
        transition: all 0.3s ease;
        text-align: center;
        z-index: 10;
      }

      .contact-item .wechat-qr::after {
        content: '';
        position: absolute;
        bottom: -6px;
        left: 50%;
        transform: translateX(-50%);
        width: 0;
        height: 0;
        border-top: 6px solid white;
        border-left: 6px solid transparent;
        border-right: 6px solid transparent;
      }

      .contact-item.wechat-contact:hover .wechat-qr {
        opacity: 1;
        visibility: visible;
      }

      .contact-item .wechat-qr img {
        width: 120px;
        height: 120px;
        border-radius: 8px;
      }

      .contact-item .wechat-qr p {
        margin: 8px 0 0;
        font-size: 12px;
        color: #666;
      }

      .footer-bottom {
        border-top: 1px solid #e0e0e0;
        padding-top: 16px;
      }

      .footer-bottom p {
        color: #999;
        font-size: 0.85rem;
        margin-bottom: 6px;
      }

      .footer-bottom a {
        color: #667eea;
        text-decoration: none;
      }

      .footer-bottom a:hover {
        text-decoration: underline;
      }

      /* Responsive */
      @media (max-width: 1200px) {
        .services-grid {
          grid-template-columns: repeat(2, 1fr);
        }
      }

      @media (max-width: 768px) {
        .navbar {
          padding: 0 20px;
        }

        .navbar-menu {
          gap: 20px;
        }

        .navbar-menu a {
          font-size: 0.9rem;
        }

        .navbar-logo {
          height: 32px;
        }

        .header h1 {
          font-size: 2rem;
        }

        .services-grid {
          grid-template-columns: 1fr;
        }

        .footer {
          padding: 20px 15px 15px;
        }

        .footer-links {
          gap: 15px;
        }

        .footer-links a {
          font-size: 0.85rem;
        }

        .floating-toolbar {
          right: 10px;
        }

        .floating-item,
        .back-to-top {
          width: 48px;
          height: 48px;
        }

        .floating-item .icon,
        .back-to-top .icon {
          font-size: 20px;
        }

        .floating-item .label,
        .back-to-top .label {
          font-size: 9px;
        }

        .floating-item .detail-bubble {
          display: none;
        }

        /* Hide floating toolbar on mobile */
        .floating-toolbar {
          display: none;
        }
      }