:root{
    --ink: #1c2733;
    --ink-2: #263444;
    --paper: #eae6d9;
    --paper-line: #cfc9b6;
    --brass: #a9822c;
    --brass-soft: #f1e6c8;
    --modern-paper: #ffffff;
    --modern-line: #d8dde3;
    --modern-ink: #16202c;
    --muted: #6b7480;
    --warn-bg: #fbf1dd;
    --warn-line: #e3c98a;
    --warn-text: #7a5a10;
  }


  /* SOURCE NOTE */
  .source-note{
    background: var(--brass-soft);
    border: 1px solid #e0cd94;
    border-radius: 6px;
    padding: 12px 16px;
    font-size: 12.5px;
    color: #5c4816;
    line-height: 1.6;
    margin-bottom: 18px;
  }
  .source-note b{ color: #3d2f0e; }

  /* GRID */
  .grid{
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: 16px;
    align-items: stretch;
  }
  @media (max-width: 820px){
    .grid{ grid-template-columns: 1fr; }
    .bridge{ transform: rotate(90deg); margin: 4px auto; }
  }

  .pane{
    border-radius: 6px;
    overflow: hidden;
    display: flex;
    flex-direction: column;
  }

  .pane-head{
    padding: 12px 16px;
    display: flex;
    justify-content: space-between;
    align-items: center;
  }
  .pane-head .title{
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 1.2px;
    text-transform: uppercase;
  }
  .pane-head .tag{
    font-family: 'JetBrains Mono', monospace;
    font-size: 10px;
    padding: 2px 8px;
    border-radius: 20px;
  }

  .pane.modern{ background: var(--modern-paper); border: 1px solid var(--modern-line); }
  .pane.modern .pane-head{ color: var(--modern-ink); border-bottom: 1px solid var(--modern-line); }
  .pane.modern .tag{ background: var(--brass-soft); color: var(--brass); }

  textarea{
    flex: 1;
    width: 100%;
    min-height: 320px;
    padding: 16px;
    border: none;
    resize: vertical;
    font-family: 'Noto Sans Devanagari', sans-serif;
    font-size: 17px;
    line-height: 1.9;
    background: transparent;
    color: var(--modern-ink);
  }
  textarea:focus{ outline: none; }
  textarea.lang-english{ font-family: 'Inter', sans-serif; font-size: 15px; line-height: 1.7; }

  /* LANGUAGE TOGGLE */
  .lang-toggle{
    display: flex;
    gap: 8px;
    padding: 10px 16px;
    border-bottom: 1px solid var(--modern-line);
    background: #f7f9fb;
  }
  .lang-btn{
    padding: 5px 14px;
    border-radius: 20px;
    border: 1px solid var(--modern-line);
    background: #fff;
    font-size: 12px;
    font-weight: 600;
    font-family: 'Inter', sans-serif;
    color: var(--modern-ink);
    cursor: pointer;
    transition: filter .15s ease;
  }
  .lang-btn:hover{ filter: brightness(0.97); }
  .lang-btn.active{ background: var(--ink-2); color: #fff; border-color: var(--ink-2); }

  .bridge{
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 8px;
  }
  .bridge svg{ width: 34px; height: 34px; }
  .bridge .arrow-line{ stroke: var(--brass); stroke-width: 2; }
  .bridge .arrow-head{ fill: var(--brass); }

  .pane.legacy{ background: var(--paper); border: 1px solid var(--paper-line); }
  .pane.legacy .pane-head{ color: var(--ink); border-bottom: 1px solid var(--paper-line); }
  .pane.legacy .tag{ background: #e4e8ee; color: var(--ink-2); }

  .output{
    flex: 1;
    min-height: 320px;
    padding: 16px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 14.5px;
    line-height: 1.8;
    color: var(--ink);
    white-space: pre-wrap;
    word-break: break-word;
    overflow: auto;
  }
  .output.placeholder{ color: #a49d88; font-family: 'Inter', sans-serif; font-size: 14px; }

  .btns{
    display: flex;
    justify-content: flex-end;
    gap: 10px;
    margin-top: 16px;
    flex-wrap: wrap;
  }

  .app{
    padding: 11px 20px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-weight: 600;
    font-size: 13.5px;
    font-family: 'Inter', sans-serif;
    color: #fff;
    background: var(--ink-2);
    transition: filter .15s ease;
  }
  .app:hover{ filter: brightness(1.15); }

  .gray{ background: #e5e1d2; color: var(--ink); border: 1px solid var(--paper-line); }
  .brass-btn{ background: var(--brass); }

  .note{
    margin-top: 14px;
    font-size: 12px;
    color: var(--muted);
    line-height: 1.6;
    background: var(--paper);
    border: 1px solid var(--paper-line);
    border-radius: 6px;
    padding: 10px 14px;
  }

  .warn-note{
    margin-top: 14px;
    font-size: 12.5px;
    color: var(--warn-text);
    line-height: 1.65;
    background: var(--warn-bg);
    border: 1px solid var(--warn-line);
    border-radius: 6px;
    padding: 12px 16px;
  }
  .warn-note b{ display: block; margin-bottom: 4px; }