:root {
  color-scheme: dark;
  font-family: "Inter", "Segoe UI", system-ui, sans-serif;
  background: #1c1f26;
  color: #e6e8ee;
  --bg: #1c1f26;
  --bg-2: #1f232b;
  --bg-3: #1b1f27;
  --surface: #232831;
  --surface-2: #272c36;
  --border: #2a2f3a;
  --text: #e6e8ee;
  --text-strong: #f1f3f7;
  --muted: #9aa3b2;
  --accent: #3c6ff0;
  --accent-contrast: #86a6ff;
  --active-bg: #1f2b46;
  --output-bg: #171a20;
  --output-text: #e6e8ee;
  --editor-bg: #1c1f26;
  --current-line: #222834;
  --line-numbers: #7f8796;
}

:root[data-theme="light"] {
  color-scheme: light;
  background: #f5f6f9;
  color: #1b2230;
  --bg: #f5f6f9;
  --bg-2: #ffffff;
  --bg-3: #f0f2f6;
  --surface: #ffffff;
  --surface-2: #f3f4f7;
  --border: #d7dbe3;
  --text: #1b2230;
  --text-strong: #151b26;
  --muted: #5b677a;
  --accent: #2d5df6;
  --accent-contrast: #2d5df6;
  --active-bg: #e7efff;
  --output-bg: #ffffff;
  --output-text: #1b2230;
  --editor-bg: #ffffff;
  --current-line: #eef2ff;
  --line-numbers: #6c7687;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
}

.app {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.topbar {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 20px;
  padding: 14px 24px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-2);
}

.title-block {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.title {
  font-weight: 700;
  font-size: 16px;
  color: var(--text-strong);
}

.subtitle {
  font-size: 12px;
  color: var(--muted);
}

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

button {
  border: 1px solid transparent;
  border-radius: 5px;
  padding: 8px 14px;
  font-weight: 600;
  cursor: pointer;
  transition: 0.2s ease;
  background: transparent;
  color: var(--text);
}

button.primary {
  background: var(--accent);
  color: white;
  border-color: var(--accent);
}

button.primary:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

button.ghost {
  background: var(--surface-2);
  color: var(--text);
  border-color: var(--border);
}

button.small {
  padding: 6px 10px;
  font-size: 12px;
}

button:hover:not(:disabled) {
  filter: brightness(0.98);
}

.subbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 24px;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  gap: 16px;
}

.status {
  font-size: 12px;
  color: var(--muted);
}

.main {
  flex: 1;
  display: grid;
  grid-template-columns: 220px 1fr;
  min-height: 0;
}

.sidebar {
  border-right: 1px solid var(--border);
  padding: 16px 14px;
  background: var(--bg-3);
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.panel-title {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--muted);
}

.file-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.file-item {
  padding: 8px 10px;
  border-radius: 6px;
  background: var(--surface);
  cursor: pointer;
  border: 1px solid transparent;
  font-weight: 600;
  color: var(--text);
}

.file-item.active {
  border-color: var(--accent);
  background: var(--active-bg);
  color: var(--accent-contrast);
}

.workspace {
  display: grid;
  grid-template-columns: 1fr 8px var(--output-width, 360px);
  grid-template-rows: auto 1fr;
  min-height: 0;
  background: var(--bg);
}

.tabs {
  display: flex;
  gap: 6px;
  padding: 8px 12px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-2);
  grid-column: 1 / -1;
}

.tab {
  padding: 6px 12px;
  border-radius: 6px;
  background: var(--surface-2);
  color: var(--text);
  cursor: pointer;
  border: 1px solid transparent;
  font-weight: 600;
}

.tab.active {
  border-color: var(--accent);
  color: var(--accent-contrast);
  background: var(--active-bg);
}

.editor-pane {
  min-height: 0;
  grid-column: 1 / 2;
  grid-row: 2 / 3;
}

.editor {
  min-height: 0;
  background: var(--editor-bg);
  height: 100%;
}

.editor .monaco-editor,
.editor .monaco-editor-background,
.editor .monaco-editor .margin {
  background: var(--editor-bg);
}

.editor .monaco-editor .margin {
  border-right: 1px solid var(--border);
}

.editor .monaco-editor .line-numbers {
  color: var(--line-numbers);
}

.editor .monaco-editor .current-line {
  background: var(--current-line);
}

.splitter {
  grid-column: 2 / 3;
  grid-row: 2 / 3;
  cursor: col-resize;
  background: var(--border);
}

.splitter:hover {
  background: var(--accent);
}

.output {
  grid-column: 3 / 4;
  grid-row: 2 / 3;
  border-left: 1px solid var(--border);
  background: var(--bg);
  padding: 10px 14px 14px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-height: 0;
}

.output-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

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

#outputArea {
  margin: 0;
  flex: 1;
  background: var(--output-bg);
  color: var(--output-text);
  font-family: "Cascadia Mono", "Fira Code", monospace;
  font-size: 13px;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 12px;
  overflow: auto;
  white-space: pre-wrap;
}

.stdin {
  height: 120px;
  width: 100%;
  padding: 10px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--output-bg);
  color: var(--output-text);
  font-family: "Cascadia Mono", "Fira Code", monospace;
  font-size: 13px;
  resize: vertical;
}

.toggle {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  color: var(--text);
}

.toggle input {
  accent-color: var(--accent);
}

.statusbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 16px;
  border-top: 1px solid var(--border);
  background: var(--bg-2);
  font-size: 12px;
  color: var(--muted);
}

.status-left {
  display: flex;
  align-items: center;
  gap: 8px;
}

.status-separator {
  color: var(--muted);
}

@media (max-width: 960px) {
  .main {
    grid-template-columns: 1fr;
  }

  .sidebar {
    display: none;
  }

  .workspace {
    grid-template-columns: 1fr;
    grid-template-rows: auto 1fr 240px;
  }

  .output {
    border-left: none;
    border-top: 1px solid var(--border);
    grid-column: 1 / 2;
    grid-row: 3 / 4;
  }

  .splitter {
    display: none;
  }

  .editor-pane {
    grid-column: 1 / 2;
    grid-row: 2 / 3;
  }
}