:root {
    --color-canvas-default: #ffffff;
    --color-canvas-subtle: #f6f8fa;
    --color-border-default: #d0d7de;
    --color-border-muted: #d8dee4;
    --color-accent-fg: #0969da;
    --color-accent-emphasis: #0969da;
    --color-danger-fg: #cf222e;
    --color-primer-shadow-inset: inset 0 1px 0 rgba(208, 215, 222, 0.2);
    --color-primer-shadow-focus: 0 0 0 3px rgba(9, 105, 218, 0.3);
    --color-fg-default: #24292f;
    --color-fg-muted: #57606a;
    --color-fg-subtle: #6e7781;
  }

  body,
  html {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans',
      Helvetica, Arial, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji';
    font-size: 14px;
    line-height: 1.5;
    color: var(--color-fg-default);
    background-color: var(--color-canvas-subtle);
    margin: 0;
    padding: 0;
  }

  .container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 24px;
  }

  .header {
    padding-bottom: 16px;
    margin-bottom: 16px;
    border-bottom: 1px solid var(--color-border-muted);
  }

  .header h1 {
    font-size: 24px;
    font-weight: 400;
    margin: 0;
  }

  .translator {
    background-color: var(--color-canvas-default);
    border: 1px solid var(--color-border-default);
    border-radius: 30px;
    box-shadow: var(--color-primer-shadow-inset);
  }

  .translator-header {
    padding: 16px;
    background-color: var(--color-canvas-subtle);
    border-bottom: 1px solid var(--color-border-muted);
    display: flex;
    justify-content: space-between;
    align-items: center;
  }

  .language-selector {
    display: flex;
    align-items: center;
  }

  .language-label {
    font-weight: 600;
    margin-right: 8px;
  }

  .swap-btn {
    background-color: var(--color-canvas-default);
    border: 1px solid var(--color-border-default);
    border-radius: 30px;
    padding: 5px 16px;
    font-size: 14px;
    font-weight: 500;
    color: var(--color-fg-default);
    cursor: pointer;
    transition: 0.2s cubic-bezier(0.3, 0, 0.5, 1);
  }

  .swap-btn:hover {
    background-color: var(--color-canvas-subtle);
    border-color: var(--color-border-muted);
  }

  .translator-body {
    display: flex;
    margin-top: 10px;
  }

  .language-column {
    flex: 1;
    display: flex;
    padding-left: 10px;
    padding-right: 10px;
    max-width: 470px;
    flex-direction: column;
  }

  textarea {
    width: 100%;
    height: auto;
    padding: 8px;
    border: 1px solid var(--color-border-default);
    border-radius: 20px;
    background-color: var(--color-canvas-subtle);
    font-family: inherit;
    font-size: 14px;
    line-height: 1.5;
    resize: none;
    overflow: hidden;
  }

  textarea:focus {
    outline: none;
    border-color: var(--color-accent-fg);
    box-shadow: var(--color-primer-shadow-focus);
  }

  .char-count {
    margin-top: 8px;
    font-size: 12px;
    color: var(--color-fg-muted);
    text-align: right;
  }

  @media (max-width: 768px) {
    .translator-body {
      flex-direction: column;
    }
    .language-column + .language-column {
      margin-left: 0;
      margin-top: 16px;
    }
  }