.header {
    background:#fff;
    color: #333;
    padding: 0 10px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 50px;
    z-index: 100;
    border-bottom: 1px solid #f1efef;
  }
  
  .header-back {
    background: linear-gradient(135deg, #00d9a3 0%, #00c090 100%);
    border-radius: 50%;
    color: #fff;
    cursor: pointer;
    width: 30px;
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.25s ease;
    padding: 0;
    border: solid 2px #f4f4f4;
    -webkit-tap-highlight-color: transparent;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
  }
  
  .header-back:active {
    transform: scale(0.9);
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.2);
  }
  
  .header-back svg {
    width: 18px;
    height: 18px;
    stroke-width: 3;
  }
  
  .header-title {
    width: 100%;
    text-align: center;
    font-size: 16px!important;
    font-weight:700!important;
  }