:root {
  --bg-app: #0d1117;
  --bg-pane: #161b22;
  --bg-header: #21262d;
  --bg-hover: #1f242c;
  --border: #30363d;
  --border-focus: #388bfd;
  --text: #c9d1d9;
  --text-muted: #8b949e;
  --brand: #304ffe;
  --valid: #2ea043;
  --warning: #d29922;
  --invalid: #f85149;
  --font-mono: ui-monospace, "SF Mono", "Fira Code", "Cascadia Mono", monospace;
}

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

html,
body {
  height: 100%;
  background: var(--bg-app);
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.5;
  overflow: hidden;
}

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

.toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 16px;
  background: var(--bg-header);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

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

.logo {
  font-weight: 700;
  color: #fff;
  letter-spacing: 0.05em;
}

.title {
  color: var(--text-muted);
}

.badge {
  display: inline-block;
  padding: 2px 8px;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: #fff;
}

.badge-valid {
  background: var(--valid);
}

.badge-warning {
  background: var(--warning);
}

.badge-invalid {
  background: var(--invalid);
}

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

.select-label {
  color: var(--text-muted);
  font-size: 12px;
}

.select-input {
  background: var(--bg-pane);
  color: var(--text);
  border: 1px solid var(--border);
  padding: 4px 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  outline: none;
}

.select-input:focus {
  border-color: var(--border-focus);
}

.workspace {
  display: flex;
  flex: 1;
  min-height: 0;
  border-bottom: 1px solid var(--border);
}

.pane {
  display: flex;
  flex-direction: column;
  flex: 1;
  min-width: 0;
  background: var(--bg-pane);
}

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

.pane-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 6px 12px;
  background: var(--bg-app);
  border-bottom: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  flex-shrink: 0;
}

.tabs-header {
  padding: 0;
}

.tabs {
  display: flex;
}

.tab-btn {
  background: transparent;
  border: none;
  border-right: 1px solid var(--border);
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 6px 14px;
  cursor: pointer;
}

.tab-btn.active {
  background: var(--bg-pane);
  color: var(--text);
  border-bottom: 1px solid var(--bg-pane);
}

.tab-btn:hover:not(.active) {
  color: var(--text);
  background: var(--bg-hover);
}

.editor-wrap {
  display: flex;
  flex: 1;
  min-height: 0;
  position: relative;
  overflow: hidden;
}

.gutter {
  width: 44px;
  padding: 10px 8px 10px 0;
  text-align: right;
  color: var(--text-muted);
  background: var(--bg-app);
  border-right: 1px solid var(--border);
  user-select: none;
  overflow: hidden;
  white-space: pre-wrap;
  font-size: 12px;
  line-height: 1.5;
  flex-shrink: 0;
}

.editor {
  flex: 1;
  width: 100%;
  height: 100%;
  padding: 10px;
  background: transparent;
  color: var(--text);
  border: none;
  resize: none;
  outline: none;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.5;
  white-space: pre;
  tab-size: 2;
  overflow: auto;
}

.editor:focus {
  background: rgba(255, 255, 255, 0.01);
}

.output-wrap {
  flex: 1;
  min-height: 0;
  position: relative;
  overflow: hidden;
}

.tab-panel {
  display: none;
  width: 100%;
  height: 100%;
  padding: 10px;
  overflow: auto;
}

.tab-panel.active {
  display: block;
}

.tab-panel pre {
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.5;
  color: #7ee787;
  white-space: pre;
}

.diagnostics-panel {
  height: 180px;
  display: flex;
  flex-direction: column;
  background: var(--bg-app);
  flex-shrink: 0;
}

.diagnostics-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 6px 12px;
  background: var(--bg-header);
  border-bottom: 1px solid var(--border);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  flex-shrink: 0;
}

.diagnostics-count {
  font-size: 11px;
}

.diagnostics-scroll {
  flex: 1;
  overflow: auto;
}

.diagnostics-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 12px;
}

.diagnostics-table th {
  position: sticky;
  top: 0;
  background: var(--bg-pane);
  border-bottom: 1px solid var(--border);
  padding: 6px 10px;
  text-align: left;
  font-weight: 600;
  color: var(--text-muted);
  font-size: 11px;
  text-transform: uppercase;
}

.diagnostics-table td {
  padding: 6px 10px;
  border-bottom: 1px solid rgba(48, 54, 61, 0.5);
  vertical-align: top;
}

.diagnostic-row {
  cursor: pointer;
}

.diagnostic-row:hover {
  background: var(--bg-hover);
}

.diagnostic-row:focus {
  outline: 1px solid var(--border-focus);
  background: var(--bg-hover);
}

.col-stage {
  width: 85px;
  color: var(--text-muted);
}

.col-code {
  width: 90px;
  font-weight: 600;
  color: var(--border-focus);
}

.col-pos {
  width: 80px;
  color: var(--text-muted);
}

.col-message {
  color: var(--text);
}

.col-fix {
  color: var(--text-muted);
}

.severity-error .col-code {
  color: var(--invalid);
}

.severity-warning .col-code {
  color: var(--warning);
}

.diagnostic-empty {
  padding: 16px;
  text-align: center;
  color: var(--text-muted);
  font-style: italic;
}