:root{
  --bg: #eef7f7; --panel: #ffffff; --panel-2: #dcefee; --line: #bfe0de;
  --accent: #1a8a82; --accent-soft: #cdeae7; --accent-dim: #eef8f7;
  --text: #123231; --muted: #4c716e; --muted-2: #8fb2af;
}

.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: 10px; overflow: hidden; display: flex; flex-direction: column; border: 1px solid var(--line); }
.pane-head{ padding: 12px 16px; display: flex; justify-content: space-between; align-items: center; border-bottom: 1px solid var(--line); background: var(--panel-2); }
.pane-head .title{ font-size: 11px; font-weight: 700; letter-spacing: 1.2px; text-transform: uppercase; color: var(--text); }
.pane-head .tag{ font-family: 'JetBrains Mono', monospace; font-size: 10px; padding: 2px 8px; border-radius: 20px; background: var(--accent-soft); color: var(--accent); }

textarea, .tree{
  flex: 1; width: 100%; min-height: 340px; max-height: 600px; padding: 16px; border: none; resize: vertical;
  font-family: 'JetBrains Mono', monospace; font-size: 13px; line-height: 1.7; background: transparent; color: var(--text); overflow: auto; box-sizing: border-box;
}
textarea:focus{ outline: none; }
.tree{ white-space: pre-wrap; word-break: break-word; overflow: auto; }

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

.stats{ margin-top: 16px; display: flex; gap: 10px; flex-wrap: wrap; }
.stat{ background: var(--panel-2); border: 1px solid var(--line); border-radius: 8px; padding: 8px 14px; font-size: 12.5px; color: var(--muted); }
.stat b{ color: var(--accent); font-family: 'JetBrains Mono', monospace; margin-left: 4px; }

.btns{ display: flex; justify-content: flex-end; gap: 10px; margin-top: 16px; flex-wrap: wrap; }
.app{ padding: 11px 20px; border: none; border-radius: 6px; cursor: pointer; font-weight: 600; font-size: 13.5px; font-family: 'Inter', sans-serif; color: #fff; background: var(--accent); transition: filter .15s ease; }
.app:hover{ filter: brightness(1.1); }
.gray{ background: var(--line); color: var(--text); }