.header-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 70px;
  padding: 0 25px;
  background: linear-gradient(135deg, #6a11cb 0%, #2575fc 100%);
  box-shadow: 0 4px 15px rgba(37, 117, 252, 0.3);
  z-index: 1000;
  
  .brand-area {
    display: flex;
    align-items: center;
    gap: 15px;
    
    .logo {
      font-size: 28px;
      width: 40px;
      height: 40px;
      display: flex;
      align-items: center;
      justify-content: center;
      background: rgba(255, 255, 255, 0.2);
      border-radius: 50%;
      backdrop-filter: blur(5px);
    }
    
    .site-name {
      font-size: 20px;
      font-weight: 700;
      color: white;
      text-shadow: 0 2px 4px rgba(0,0,0,0.2);
      margin: 0;
    }
  }
  
  .header-actions {
    display: flex;
    gap: 15px;
    
    .contact-btn, .login-btn {
      padding: 8px 20px;
      border-radius: 30px;
      border: none;
      font-weight: 600;
      cursor: pointer;
      transition: all 0.3s ease;
      box-shadow: 0 4px 8px rgba(0,0,0,0.1);
      display: flex;
      align-items: center;
      justify-content: center;
    }
    
    .contact-btn {
      background: transparent;
      color: white;
      border: 2px solid rgba(255, 255, 255, 0.5);
      
      &:hover {
        background: rgba(255, 255, 255, 0.1);
        border-color: white;
      }
    }
    
    .login-btn {
      background: white;
      color: #2575fc;
      
      &:hover {
        background: #f0f7ff;
        transform: translateY(-2px);
        box-shadow: 0 6px 12px rgba(0,0,0,0.15);
      }
      
      &:active {
        transform: translateY(0);
      }
    }
  }
}

/* 响应式设计 - 小屏幕调整 */
@media (max-width: 768px) {
  .header-nav {
    padding: 0 15px;
    
    .site-name {
      font-size: 18px;
    }
    
    .header-actions {
      gap: 10px;
      
      .contact-btn, .login-btn {
        padding: 6px 15px;
        font-size: 14px;
      }
    }
  }
}