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

:root {
  --bg: #1e1e2e;
  --surface: #282840;
  --border: #3e3e5e;
  --text: #e0e0e0;
  --text-muted: #888;
  --accent: #6c8cff;
  --accent-hover: #8aa4ff;
  --error: #ff6b6b;
  --success: #6bff9b;
}

body {
  font-family: system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  display: flex;
  flex-direction: column;
  height: 100vh;
}

header {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  padding: 0.75rem 1.5rem;
  border-bottom: 1px solid var(--border);
}

header h1 {
  font-size: 1.25rem;
  font-weight: 700;
}

.subtitle {
  color: var(--text-muted);
  font-size: 0.875rem;
}

main {
  display: flex;
  flex: 1;
  overflow: hidden;
}

.editor-section {
  flex: 1;
  display: flex;
  flex-direction: column;
  border-right: 1px solid var(--border);
}

.toolbar {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.5rem 1rem;
  border-bottom: 1px solid var(--border);
}

.toolbar button,
.toolbar .file-upload {
  background: var(--accent);
  color: #fff;
  border: none;
  padding: 0.4rem 1rem;
  border-radius: 4px;
  cursor: pointer;
  font-size: 0.875rem;
  font-weight: 500;
}

.toolbar button:hover:not(:disabled),
.toolbar .file-upload:hover {
  background: var(--accent-hover);
}

.toolbar button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.toolbar label {
  font-size: 0.875rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.toolbar input[type="number"] {
  width: 5rem;
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0.3rem 0.5rem;
  font-size: 0.875rem;
}

#editor {
  flex: 1;
  background: var(--surface);
  color: var(--text);
  border: none;
  padding: 1rem;
  font-family: "Cascadia Code", "Fira Code", "JetBrains Mono", "Consolas", monospace;
  font-size: 0.9rem;
  line-height: 1.5;
  resize: none;
  outline: none;
  tab-size: 2;
}

.output-section {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.output-tabs {
  display: flex;
  border-bottom: 1px solid var(--border);
}

.tab {
  background: none;
  border: none;
  color: var(--text-muted);
  padding: 0.5rem 1rem;
  cursor: pointer;
  font-size: 0.875rem;
  border-bottom: 2px solid transparent;
}

.tab.active {
  color: var(--text);
  border-bottom-color: var(--accent);
}

.panel {
  display: none;
  flex: 1;
  overflow: auto;
  padding: 1rem;
  font-family: "Cascadia Code", "Fira Code", "JetBrains Mono", "Consolas", monospace;
  font-size: 0.875rem;
}

.panel.active {
  display: block;
}

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

table.var-table {
  width: 100%;
  border-collapse: collapse;
}

table.var-table th,
table.var-table td {
  text-align: left;
  padding: 0.3rem 0.75rem;
  border-bottom: 1px solid var(--border);
}

table.var-table th {
  color: var(--text-muted);
  font-weight: 500;
}

.diagnostic-item {
  padding: 0.4rem 0;
  border-bottom: 1px solid var(--border);
}

.diagnostic-code {
  color: var(--error);
  font-weight: 600;
}

.diagnostic-message {
  margin-left: 0.5rem;
}

.diagnostic-location {
  color: var(--text-muted);
  margin-left: 0.5rem;
  font-size: 0.8rem;
}

.error-message {
  color: var(--error);
  padding: 0.5rem 0;
}

.success-message {
  color: var(--success);
}

.drop-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  z-index: 100;
  align-items: center;
  justify-content: center;
}

.drop-overlay.visible {
  display: flex;
}

.drop-message {
  font-size: 1.5rem;
  color: var(--accent);
  border: 3px dashed var(--accent);
  padding: 3rem 4rem;
  border-radius: 12px;
}

footer {
  padding: 0.4rem 1.5rem;
  border-top: 1px solid var(--border);
  font-size: 0.8rem;
  color: var(--text-muted);
}