:root {
  --bg: #0f1117;
  --panel-bg: #161922;
  --panel-header: #1c202c;
  --border: #2a3042;
  --text: #e6edf3;
  --text-muted: #8b949e;
  --accent: #58a6ff;
  --accent-bg: rgba(88, 166, 255, 0.14);
  --ok: #3fb950;
  --ok-bg: rgba(63, 185, 80, 0.14);
  --warn: #d29922;
  --warn-bg: rgba(210, 153, 34, 0.15);
  --err: #f85149;
  --err-bg: rgba(248, 81, 73, 0.15);
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f6f8fa;
    --panel-bg: #ffffff;
    --panel-header: #f0f3f6;
    --border: #d0d7de;
    --text: #1f2328;
    --text-muted: #59636e;
    --accent: #0969da;
    --accent-bg: rgba(9, 105, 218, 0.1);
    --ok: #1a7f37;
    --ok-bg: rgba(26, 127, 55, 0.1);
    --warn: #9a6700;
    --warn-bg: rgba(154, 103, 0, 0.12);
    --err: #cf222e;
    --err-bg: rgba(207, 34, 46, 0.1);
  }
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 14px;
}

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

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 16px;
  background: var(--panel-header);
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
}

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

.brand-title {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 16px;
  color: var(--accent);
}

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

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

.toolbar-field {
  display: flex;
  align-items: center;
  gap: 6px;
}

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

select,
input[type="text"],
.button-secondary {
  background: var(--panel-bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 5px 10px;
  font-size: 13px;
  font-family: var(--font-mono);
}

input[type="text"] {
  width: 210px;
}

.button-secondary {
  font-family: var(--font-sans);
  cursor: pointer;
}

.button-secondary:hover {
  border-color: var(--accent);
}

.repo-link {
  color: var(--accent);
  text-decoration: none;
  font-size: 13px;
  font-weight: 500;
}

.repo-link:hover {
  text-decoration: underline;
}

.workspace {
  flex: 1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  padding: 12px;
  min-height: 0;
}

@media (max-width: 960px) {
  .workspace {
    grid-template-columns: 1fr;
    overflow-y: auto;
  }
}

.editor-column,
.output-column {
  display: flex;
  flex-direction: column;
  gap: 12px;
  min-height: 0;
}

.pane {
  display: flex;
  flex-direction: column;
  background: var(--panel-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  min-height: 0;
}

.code-pane {
  flex: 2;
}

.config-pane {
  flex: 1;
}

.output-pane {
  flex: 1;
}

.pane-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 8px 12px;
  background: var(--panel-header);
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
}

.pane-title {
  font-weight: 600;
  font-size: 13px;
}

.pane-hint {
  font-size: 12px;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

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

.badge {
  font-family: var(--font-mono);
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 999px;
  background: var(--accent-bg);
  color: var(--accent);
}

.badge-ok {
  background: var(--ok-bg);
  color: var(--ok);
}

.badge-warn {
  background: var(--warn-bg);
  color: var(--warn);
}

.badge-err {
  background: var(--err-bg);
  color: var(--err);
}

.code-textarea {
  flex: 1;
  width: 100%;
  border: none;
  outline: none;
  resize: none;
  padding: 12px;
  background: var(--panel-bg);
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.5;
  tab-size: 4;
}

.tab-bar {
  display: flex;
  gap: 4px;
}

.tab-button {
  background: transparent;
  color: var(--text-muted);
  border: 1px solid transparent;
  border-radius: 6px;
  padding: 4px 10px;
  font-size: 12px;
  cursor: pointer;
}

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

.explain-toolbar {
  padding: 8px 12px;
  border-bottom: 1px solid var(--border);
  background: var(--panel-header);
}

.explain-field select {
  width: 280px;
}

.hidden {
  display: none;
}

.output-body {
  flex: 1;
  padding: 12px;
  overflow-y: auto;
}

.empty-state {
  color: var(--ok);
  font-family: var(--font-mono);
  padding: 12px;
  background: var(--ok-bg);
  border-radius: 6px;
}

.error-box {
  color: var(--err);
  font-family: var(--font-mono);
  white-space: pre-wrap;
  padding: 12px;
  background: var(--err-bg);
  border: 1px solid var(--err);
  border-radius: 6px;
}

.diag-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.diag-card {
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 10px 12px;
  background: var(--panel-header);
}

.diag-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 6px;
  flex-wrap: wrap;
}

.diag-location {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-muted);
}

.rule-pill {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--accent);
  background: var(--accent-bg);
  border: 1px solid transparent;
  border-radius: 4px;
  padding: 2px 6px;
  cursor: pointer;
}

.rule-pill:hover {
  border-color: var(--accent);
}

.diag-summary {
  font-weight: 600;
  margin-bottom: 6px;
}

.diag-detail {
  font-size: 13px;
  color: var(--text-muted);
  margin-top: 4px;
  line-height: 1.45;
}

.diag-detail-label {
  color: var(--text);
  font-weight: 500;
}

.pre-output {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.5;
  white-space: pre-wrap;
  word-break: break-word;
}