:root {
  --bg-primary: #0d1117;
  --bg-secondary: #161b22;
  --bg-tertiary: #21262d;
  --border-color: #30363d;
  --accent-cyan: #58a6ff;
  --accent-green: #3fb950;
  --accent-purple: #bc8cff;
  --accent-orange: #d29922;
  --text-main: #f0f6fc;
  --text-muted: #8b949e;
  --font-mono: "Fira Code", monospace;
  --font-sans: "Inter", sans-serif;
}

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

body {
  background-color: var(--bg-primary);
  color: var(--text-main);
  font-family: var(--font-sans);
  height: 100vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

/* Navbar */
.navbar {
  height: 58px;
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-logo {
  font-size: 24px;
}

.brand-name {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.5px;
  background: linear-gradient(90deg, #58a6ff, #bc8cff);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.brand-badge {
  font-size: 11px;
  background: rgba(88, 166, 255, 0.15);
  color: var(--accent-cyan);
  border: 1px solid rgba(88, 166, 255, 0.3);
  padding: 2px 8px;
  border-radius: 12px;
  margin-left: 6px;
}

.controls {
  display: flex;
  align-items: center;
  gap: 12px;
}

.selector-wrapper {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--text-muted);
}

select {
  background: var(--bg-tertiary);
  color: var(--text-main);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 6px 12px;
  font-family: var(--font-sans);
  font-size: 13px;
  outline: none;
  cursor: pointer;
}

.btn {
  border-radius: 6px;
  font-size: 13px;
  font-weight: 600;
  padding: 7px 16px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: all 0.15s ease;
  border: 1px solid transparent;
}

.btn-run {
  background: #238636;
  color: #ffffff;
  border-color: rgba(240, 246, 252, 0.1);
}

.btn-run:hover {
  background: #2ea043;
}

.kbd-hint {
  font-size: 11px;
  opacity: 0.8;
  background: rgba(0, 0, 0, 0.2);
  padding: 1px 4px;
  border-radius: 3px;
}

.btn-secondary {
  background: var(--bg-tertiary);
  color: var(--text-main);
  border: 1px solid var(--border-color);
}

.btn-secondary:hover {
  background: #30363d;
}

/* Main Workspace */
.workspace {
  flex: 1;
  display: flex;
  overflow: hidden;
}

.editor-pane, .output-pane {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.editor-pane {
  border-right: 1px solid var(--border-color);
}

.pane-header {
  height: 38px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 16px;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-muted);
}

.pane-status, .exec-time {
  color: var(--accent-green);
  font-family: var(--font-mono);
  font-size: 11px;
}

/* Editor Container */
.editor-container {
  flex: 1;
  display: flex;
  position: relative;
  background: #090d13;
}

.line-numbers {
  width: 44px;
  background: var(--bg-secondary);
  border-right: 1px solid var(--border-color);
  padding: 16px 8px;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 20px;
  color: #484f58;
  text-align: right;
  user-select: none;
}

#codeEditor {
  flex: 1;
  background: transparent;
  color: var(--text-main);
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 20px;
  padding: 16px;
  border: none;
  outline: none;
  resize: none;
  white-space: pre;
  tab-size: 4;
}

/* Output Pane */
.output-box {
  flex: 1.2;
  display: flex;
  flex-direction: column;
  border-bottom: 1px solid var(--border-color);
  background: #05070a;
}

.terminal-content {
  flex: 1;
  padding: 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 18px;
  color: #388bfd;
  overflow-y: auto;
  white-space: pre-wrap;
}

.visualizer-box {
  flex: 1;
  display: flex;
  flex-direction: column;
  background: var(--bg-secondary);
}

.visualizer-viewport {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
  overflow: hidden;
}

/* Footer */
.footer {
  height: 28px;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 16px;
  font-size: 11px;
  color: var(--text-muted);
}