:root {
  --bg: #0f1117;
  --panel: #161923;
  --border: #2a2e3a;
  --text: #e6e6e6;
  --muted: #8a8f9c;
  --accent: #6c5ce7;
  --accent-2: #00d1a0;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  height: 100vh;
  display: flex;
  flex-direction: column;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 20px;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
}

.brand { display: flex; align-items: center; gap: 8px; }
.logo {
  background: var(--accent);
  color: white;
  font-weight: 700;
  width: 28px; height: 28px;
  display: flex; align-items: center; justify-content: center;
  border-radius: 6px;
}
.brand-name { font-weight: 700; font-size: 18px; }
.brand-sub { color: var(--muted); font-size: 13px; margin-left: 6px; }

.controls { display: flex; gap: 10px; align-items: center; }

select, button {
  background: #1e2230;
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 8px 12px;
  font-size: 14px;
  cursor: pointer;
}

#runBtn {
  background: var(--accent-2);
  color: #051a14;
  font-weight: 700;
  border: none;
}
#runBtn:hover { opacity: 0.9; }
#runBtn:disabled { opacity: 0.5; cursor: not-allowed; }

.workspace {
  flex: 1;
  display: flex;
  min-height: 0;
}

.editor-pane {
  flex: 1.4;
  display: flex;
  flex-direction: column;
  border-right: 1px solid var(--border);
  min-width: 0;
}

.io-pane {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.io-block {
  flex: 1;
  display: flex;
  flex-direction: column;
  border-bottom: 1px solid var(--border);
  min-height: 0;
}

.pane-header {
  background: var(--panel);
  padding: 8px 14px;
  font-size: 13px;
  color: var(--muted);
  border-bottom: 1px solid var(--border);
}

.CodeMirror {
  flex: 1;
  height: 100% !important;
  font-size: 14px;
}

#stdinBox {
  flex: 1;
  background: #10131b;
  color: var(--text);
  border: none;
  padding: 10px;
  resize: none;
  font-family: "Fira Code", monospace;
  font-size: 13px;
}

#output {
  flex: 1;
  margin: 0;
  padding: 10px;
  background: #0b0d12;
  color: #b8f5d0;
  overflow: auto;
  white-space: pre-wrap;
  font-family: "Fira Code", monospace;
  font-size: 13px;
}

.statusbar {
  background: var(--panel);
  border-top: 1px solid var(--border);
  padding: 6px 16px;
  font-size: 12px;
  color: var(--muted);
}