:root {
  color-scheme: light;
  --bg: #f4f6f8;
  --panel: #ffffff;
  --border: #d7dde5;
  --text: #1f2937;
  --muted: #5d6b7a;
  --accent: #1f6feb;
  --accent-hover: #185abd;
  --control: #ffffff;
  --code-bg: #ffffff;
  --gutter-bg: #f1f3f5;
  --gutter-text: #667085;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

.app-shell {
  min-height: 100vh;
  padding: 16px;
}

.workspace {
  display: grid;
  grid-template-columns: minmax(320px, 0.95fr) minmax(420px, 1.2fr);
  gap: 16px;
  max-width: 1500px;
  height: calc(100vh - 32px);
  margin: 0 auto;
}

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

.pane-header {
  padding: 16px;
  border-bottom: 1px solid var(--border);
}

h1 {
  margin: 0;
  font-size: 20px;
  line-height: 1.2;
  letter-spacing: 0;
}

p {
  margin: 6px 0 0;
  color: var(--muted);
  font-size: 13px;
}

textarea {
  flex: 1;
  width: 100%;
  min-height: 0;
  resize: none;
  border: 0;
  outline: 0;
  padding: 16px;
  color: var(--text);
  background: var(--panel);
  font: 14px/1.55 Consolas, "Courier New", monospace;
  tab-size: 4;
}

.toolbar {
  display: flex;
  align-items: end;
  gap: 10px;
  flex-wrap: wrap;
  padding: 12px;
  border-bottom: 1px solid var(--border);
  background: #f8fafc;
}

label {
  display: grid;
  gap: 4px;
  font-size: 12px;
  color: var(--muted);
}

select,
button {
  min-height: 34px;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0 10px;
  background: var(--control);
  color: var(--text);
  font: inherit;
}

button {
  cursor: pointer;
}

button:hover,
select:hover {
  border-color: #aeb8c6;
}

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

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

button[aria-pressed="false"] {
  color: var(--muted);
  background: #eef2f7;
}

.status {
  min-height: 28px;
  padding: 7px 14px;
  color: var(--muted);
  font-size: 13px;
  border-bottom: 1px solid var(--border);
}

.status.success {
  color: #137333;
}

.status.error {
  color: #b3261e;
}

.preview {
  flex: 1;
  overflow: auto;
  padding: 16px;
  background: #f8fafc;
}

.code-table {
  width: 100%;
  border-collapse: collapse;
  table-layout: fixed;
  background: var(--code-bg);
  border: 1px solid var(--border);
  font-family: Consolas, "Courier New", monospace;
  font-size: var(--code-font-size, 12px);
  line-height: 1.45;
}

.code-table td {
  vertical-align: top;
}

.line-number {
  width: 46px;
  padding: 0 8px;
  text-align: right;
  color: var(--gutter-text);
  background: var(--gutter-bg);
  border-right: 2px solid #b7d7a8;
  user-select: none;
}

.code-line {
  padding: 0 12px;
  white-space: pre;
  overflow-wrap: normal;
  word-break: normal;
}

.code-line code {
  font: inherit;
  white-space: pre;
}

.no-line-numbers .line-number {
  display: none;
}

.no-line-numbers .code-line {
  padding-left: 14px;
}

body.dark {
  color-scheme: dark;
  --bg: #111827;
  --panel: #161b22;
  --border: #30363d;
  --text: #d1d5db;
  --muted: #9aa4b2;
  --control: #0d1117;
  --code-bg: #0d1117;
  --gutter-bg: #161b22;
  --gutter-text: #8b949e;
}

body.dark .toolbar,
body.dark .preview {
  background: #0f172a;
}

@media (max-width: 860px) {
  .app-shell {
    padding: 10px;
  }

  .workspace {
    grid-template-columns: 1fr;
    height: auto;
  }

  .pane {
    min-height: 48vh;
  }
}