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

:root {
  --bg: #1e1e1e;
  --panel: #252526;
  --border: #3c3c3c;
  --text: #d4d4d4;
  --muted: #8a8a8a;
  --accent: #0e639c;
  --accent-hover: #1177bb;
  --ok: #4ec96f;
  --warn: #dcdcaa;
  --err: #f48771;
}

html, body {
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
}

body { display: flex; flex-direction: column; }

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 16px;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
}

header h1 { font-size: 16px; font-weight: 600; }

.header-actions { display: flex; align-items: center; gap: 14px; }
.hint { color: var(--muted); font-size: 12px; }

#run-btn {
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 4px;
  padding: 8px 22px;
  font-size: 14px;
  cursor: pointer;
}
#run-btn:hover:not(:disabled) { background: var(--accent-hover); }
#run-btn:disabled { opacity: 0.6; cursor: wait; }

main {
  flex: 1;
  display: flex;
  min-height: 0;
}

#editor-pane { flex: 3; min-width: 0; }
#editor { height: 100%; }

#io-pane {
  flex: 2;
  min-width: 320px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 12px;
  background: var(--panel);
  border-left: 1px solid var(--border);
  overflow: hidden;
}

.io-block { display: flex; flex-direction: column; min-height: 0; }
.io-block.grow { flex: 1; }

.io-block label {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--muted);
  margin-bottom: 6px;
}

#stdin {
  height: 90px;
  resize: vertical;
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 8px;
  font-family: "SF Mono", Menlo, Consolas, monospace;
  font-size: 13px;
}
#stdin:focus { outline: 1px solid var(--accent); }

.output {
  flex: 1;
  overflow: auto;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 10px;
}

.placeholder { color: var(--muted); font-size: 13px; }

.out-section { margin-bottom: 12px; }

.out-title {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--muted);
  margin-bottom: 4px;
}

.out-body {
  font-family: "SF Mono", Menlo, Consolas, monospace;
  font-size: 13px;
  white-space: pre-wrap;
  word-break: break-word;
}
.out-body.warn { color: var(--warn); }
.out-body.err { color: var(--err); }

.status {
  font-size: 13px;
  padding-top: 8px;
  border-top: 1px solid var(--border);
}
.status.ok { color: var(--ok); }
.status.err { color: var(--err); }

@media (max-width: 800px) {
  main { flex-direction: column; }
  #editor-pane { flex: 1; min-height: 45vh; }
  #io-pane { border-left: none; border-top: 1px solid var(--border); }
}