* {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
      font-family: system-ui, sans-serif
    }

    body {
      background: var(--bg);
      /* padding: 12px; */
      margin: 0 auto
    }

    .card {
      background: #fff;
      border-radius: 10px;
      padding: 14px;
      margin-bottom: 12px;
      box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08)
    }

    h2 {
      font-size: 17px;
      margin-bottom: 10px
    }

    .info {
      font-size: 13px;
      color: #555;
      margin: 8px 0;
      padding: 8px;
      background: #f8f9fa;
      border-radius: 6px
    }

    button {
      padding: 10px 14px;
      background: var(--btn-bg);
      color: var(--text);
      border: none;
      border-radius: 8px;
      cursor: pointer;
      margin-top: 6px
    }

    input {
      width: 100%;
      margin: 8px 0
    }

    #preview {
      width: 100%;
      min-height: 100px;
      background: #f1f3f5;
      border-radius: 8px;
      padding: 8px;
      margin-top: 10px;
      overflow: auto
    }

    canvas {
      max-width: 100%;
      display: block;
      margin: 10px auto
    }

    #textResult {
      white-space: pre-wrap;
      background: #f8f9fa;
      padding: 10px;
      border-radius: 8px;
      max-height: 400px;
      overflow-y: auto;
      margin-top: 10px
    }

    #exportArea {
      padding: 20px;
      border: 1px solid #eee;
      border-radius: 8px;
      background: #fff;
      margin: 10px 0
    }

    @media(max-width:600px) {
      button {
        width: 100%
      }
    }