* {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
      font-family: "Microsoft YaHei", sans-serif;
    }
    body {
      background: #f7f8fc;
      padding: 20px 15px;
      max-width: 480px;
      margin: 0 auto;
    }
    .title {
      text-align: center;
      font-size: 24px;
      color: #222;
      margin-bottom: 25px;
      font-weight: 600;
    }
    .card {
      background: #fff;
      border-radius: 18px;
      padding: 20px;
      margin-bottom: 20px;
      box-shadow: 0 4px 14px rgba(0,0,0,0.06);
    }
    .stat-card {
      display: flex;
      justify-content: space-around;
      background: linear-gradient(135deg,#5b7cfd,#395de8);
      color: #fff;
    }
    .stat-item {text-align: center;}
    .stat-txt {font-size: 14px; opacity: 0.9; margin-bottom: 6px;}
    .stat-val {font-size: 22px; font-weight: bold;}
    .input-box {margin: 16px 0;}
    label {display: block; font-size: 14px; color: #555; margin-bottom: 8px;}
    input,select {
      width: 100%;
      padding: 12px 14px;
      border: 1px solid #eee;
      border-radius: 12px;
      font-size: 15px;
      outline: none;
      transition: 0.2s;
    }
    input:focus,select:focus {border-color: #5b7cfd;}
    .add-btn {
      width: 100%;
      padding: 13px;
      background: #5b7cfd;
      color: #fff;
      border: none;
      border-radius: 12px;
      font-size: 16px;
      cursor: pointer;
      transition: 0.2s;
    }
    .add-btn:hover {background: #395de8;}
    .list-head {font-size: 18px; margin-bottom: 15px; color: #333;}
    .bill-row {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 12px 0;
      border-bottom: 1px solid #f1f1f1;
    }
    .income {color: #22c55e;}
    .expend {color: #ef4444;}
    .btn-group{display:flex;gap:10px;margin-top:15px;}
    .clear-btn {
      flex:1;
      padding: 10px;
      border: 1px solid #ef4444;
      color: #ef4444;
      background: #fff;
      border-radius: 10px;
      cursor: pointer;
    }
    .export-btn {
      flex:1;
      padding: 10px;
      border: 1px solid #10b981;
      color: #10b981;
      background: #fff;
      border-radius: 10px;
      cursor: pointer;
    }