/* ===== 收银台全屏模式 ===== */
    #app.cashier-mode #sidebar { display: none !important; }
    #app.cashier-mode #header  { display: none !important; }
    #app.cashier-mode #main    { width: 100%; height: 100vh; overflow: hidden; }
    #app.cashier-mode #content { padding: 0; overflow: hidden; height: 100vh; }
    #app.cashier-mode .page.active { display: flex; flex-direction: column; height: 100%; }

    /* 收银台专属顶部栏 */
    .cashier-topbar {
      height: 60px;
      background: #fff;
      border-bottom: 1px solid #eef1f4;
      display: flex;
      align-items: center;
      padding: 0 15px;
      gap: 12px;
      box-shadow: none;
      flex-shrink: 0;
    }
    .cashier-back-btn {
      display: flex; align-items: center; gap: 6px;
      height: 32px;
      padding: 0 12px;
      background: #5cc286;
      border: 1px solid #5cc286;
      border-radius: 2px;
      font-size: 14px;
      color: #fff;
      cursor: pointer;
      transition: all .2s;
      white-space: nowrap;
    }
    .cashier-back-btn:hover { background: #4fb679; color: #fff; }
    .cashier-back-btn svg { width: 16px; height: 16px; flex-shrink: 0; }
    .cashier-topbar-title {
      font-size: 16px; font-weight: 700; color: var(--text-primary);
      display: flex; align-items: center; gap: 6px;
    }
    .cashier-topbar-spacer { flex: 1; }
    /* 顶部栏右侧按钮(复用原有样式) */

    /* ===== 收银台主体 ===== */
    .cashier-wrap {
      display: flex;
      height: calc(100vh - 60px);
      overflow: hidden;
      background: #f6f7f9;
      padding: 12px;
      gap: 14px;
      box-sizing: border-box;
    }