:root{
  --bg: #fdf5ec;
  --panel: #ffffff;
  --panel-2: #fbeee0;
  --line: #f0ddc4;
  --red: #c8102e;
  --red-soft: #fbdbdf;
  --gold: #b8860b;
  --gold-soft: #f7ecd0;
  --modern-ink: #201a12;
  --muted: #7a6d5a;
  --line-2: #d8dde3;
}

.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-2);
  background: #fff;
}

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

.lang-toggle{
  display: flex;
  gap: 8px;
  padding: 10px 16px;
  border-bottom: 1px solid var(--line-2);
  background: #f9f7f3;
}
.lang-btn{
  padding: 5px 14px;
  border-radius: 20px;
  border: 1px solid var(--line-2);
  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(--red); color: #fff; border-color: var(--red); }

textarea, .output{
  flex: 1;
  width: 100%;
  min-height: 320px;
  padding: 16px;
  border: none;
  resize: vertical;
  font-family: 'Inter', sans-serif;
  font-size: 15.5px;
  line-height: 1.8;
  background: transparent;
  color: var(--modern-ink);
}
textarea:focus{ outline: none; }
.output{
  white-space: pre-wrap;
  word-break: break-word;
  overflow: auto;
}
.output.placeholder{ color: #b3a78f; font-size: 14px; }

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

.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(--red);
  transition: filter .15s ease;
}
.app:hover{ filter: brightness(1.08); }

.gray{ background: #f1e9d8; color: var(--modern-ink); border: 1px solid var(--line); }
.gold-btn{ background: var(--gold); }

.note{
  margin-top: 14px;
  font-size: 12px;
  color: var(--muted);
  line-height: 1.6;
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 10px 14px;
}