* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --bg: #0e0e0e;
  --surface: #161616;
  --border: #252525;
  --text: #c8c8c8;
  --text-dim: #666;
  --accent: #3a7;
  --accent-dim: #2a5;
  --err: #c44;
}

body {
  font-family: "SF Mono", "Fira Code", "Consolas", monospace;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  font-size: 13px;
  line-height: 1.5;
}

#app {
  max-width: 960px;
  margin: 0 auto;
  padding: 16px 12px;
}

header {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}

header h1 {
  font-size: 16px;
  font-weight: 600;
  color: var(--accent);
  letter-spacing: 1px;
}

.sub {
  font-size: 11px;
  color: var(--text-dim);
  letter-spacing: 0.5px;
}

.controls {
  margin-bottom: 12px;
}

.mode-row {
  display: flex;
  gap: 4px;
  margin-bottom: 8px;
}

.mode-btn {
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text-dim);
  padding: 6px 14px;
  font-family: inherit;
  font-size: 11px;
  cursor: pointer;
  transition: all 0.15s;
  letter-spacing: 0.5px;
}

.mode-btn:hover {
  color: var(--text);
  border-color: var(--text-dim);
}

.mode-btn.active {
  color: var(--accent);
  border-color: var(--accent);
  background: #1a2a1f;
}

.lang-row {
  display: flex;
  align-items: center;
  gap: 8px;
}

select {
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 5px 10px;
  font-family: inherit;
  font-size: 12px;
  cursor: pointer;
  min-width: 160px;
}

select:focus {
  outline: none;
  border-color: var(--accent);
}

.workspace {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin-bottom: 10px;
}

.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  display: flex;
  flex-direction: column;
}

.panel-head {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 10px;
  border-bottom: 1px solid var(--border);
  background: #111;
}

.panel-label {
  font-size: 10px;
  color: var(--text-dim);
  letter-spacing: 0.5px;
  text-transform: uppercase;
  flex: 1;
}

.sm-btn {
  background: none;
  border: 1px solid var(--border);
  color: var(--text-dim);
  padding: 2px 8px;
  font-family: inherit;
  font-size: 10px;
  cursor: pointer;
  transition: all 0.15s;
}

.sm-btn:hover {
  color: var(--text);
  border-color: var(--text-dim);
}

textarea {
  background: transparent;
  border: none;
  color: var(--text);
  padding: 10px;
  font-family: inherit;
  font-size: 13px;
  line-height: 1.5;
  resize: none;
  height: 220px;
  width: 100%;
}

textarea:focus {
  outline: none;
}

textarea::placeholder {
  color: var(--text-dim);
}

.output-panel pre {
  padding: 10px;
  height: 220px;
  overflow: auto;
  white-space: pre-wrap;
  word-wrap: break-word;
}

.output-panel code {
  font-family: inherit;
  font-size: 13px;
  color: var(--text);
}

.action-row {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}

.go-btn {
  background: var(--accent);
  border: none;
  color: #0e0e0e;
  padding: 8px 28px;
  font-family: inherit;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  letter-spacing: 0.5px;
  transition: all 0.15s;
}

.go-btn:hover {
  background: var(--accent-dim);
}

.go-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.status {
  font-size: 11px;
  color: var(--text-dim);
}

.status.error {
  color: var(--err);
}

.terminal-section {
  background: var(--surface);
  border: 1px solid var(--border);
}

.terminal {
  padding: 10px;
  height: 140px;
  overflow: auto;
  font-size: 12px;
  white-space: pre-wrap;
  word-wrap: break-word;
}

.term-placeholder {
  color: var(--text-dim);
  font-style: italic;
}

.term-line {
  display: block;
  color: var(--text);
}

.term-err {
  color: var(--err);
}

.term-info {
  color: var(--accent);
}

@media (max-width: 640px) {
  #app {
    padding: 10px 8px;
  }

  .workspace {
    grid-template-columns: 1fr;
  }

  textarea,
  .output-panel pre {
    height: 160px;
  }

  .mode-btn {
    padding: 6px 10px;
    font-size: 10px;
  }

  header h1 {
    font-size: 14px;
  }
}