:root {
  color-scheme: light;
  --ui-scale: 0.9;
  --ui-scale-inverse-size: 111.111%;
  --ui-scale-inverse-height: 111.111vh;
  --bg: #f7f7f7;
  --panel: #ffffff;
  --panel-alt: #f2f2f2;
  --text: #202124;
  --muted: #6b7280;
  --line: #d8d8d8;
  --accent: #202124;
  --accent-strong: #000000;
  --accent-soft: #fff36d;
}

* {
  box-sizing: border-box;
}

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

html {
  height: 100%;
  overflow: hidden;
}

body {
  width: var(--ui-scale-inverse-size);
  min-height: var(--ui-scale-inverse-height);
  overflow: hidden;
  zoom: var(--ui-scale);
}

button,
textarea {
  font: inherit;
}

.topbar {
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 10px 18px;
  background: var(--panel);
  border-bottom: 1px solid var(--line);
}

.brand {
  display: flex;
  align-items: center;
  min-width: 0;
}

h1 {
  margin: 0;
  font-size: 18px;
  font-style: normal;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: 0;
}

.actions {
  display: flex;
  gap: 8px;
  flex: 0 0 auto;
}

.actions button {
  min-width: 82px;
  height: 36px;
  border: 1px solid var(--line);
  border-radius: 0;
  background: var(--panel);
  color: var(--text);
  cursor: pointer;
}

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

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

.actions button:last-child:hover {
  background: var(--accent-strong);
  color: #ffffff;
}

.workspace {
  height: calc(var(--ui-scale-inverse-height) - 64px);
  display: grid;
  grid-template-columns: minmax(360px, 52%) minmax(320px, 48%);
  gap: 8px;
  padding: 8px;
}

.editor-pane,
.preview-pane {
  min-height: 0;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 0;
  overflow: hidden;
}

.editor-pane {
  display: grid;
  grid-template-rows: auto auto 1fr;
}

.file-tabs {
  display: flex;
  overflow-x: auto;
  background: var(--panel-alt);
  border-bottom: 1px solid var(--line);
}

.file-tab {
  height: 42px;
  padding: 0 14px;
  border: 0;
  border-right: 1px solid var(--line);
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  white-space: nowrap;
}

.file-tab.active {
  background: var(--panel);
  color: var(--text);
  font-weight: 700;
}

.editor-label,
.preview-bar {
  height: 38px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 0 12px;
  color: var(--muted);
  font-size: 13px;
  border-bottom: 1px solid var(--line);
}

#activeFile,
.preview-bar span:first-child {
  color: var(--text);
  font-weight: 700;
}

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

.preview-actions button {
  height: 28px;
  padding: 0 10px;
  border: 1px solid var(--line);
  border-radius: 0;
  background: var(--panel);
  color: var(--text);
  cursor: pointer;
  font-size: 12px;
}

.preview-actions button:hover {
  border-color: var(--accent-strong);
}

.CodeMirror {
  width: 100%;
  height: 100%;
  min-height: 0;
  background: #ffffff;
  color: #202124;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: 14px;
  line-height: 1.55;
}

.CodeMirror-lines {
  padding: 16px 0;
}

.CodeMirror pre.CodeMirror-line,
.CodeMirror pre.CodeMirror-line-like {
  padding: 0 16px;
}

.CodeMirror-gutters {
  background: #f2f2f2;
  border-right: 1px solid var(--line);
}

.CodeMirror-linenumber {
  color: #98a2b3;
}

.CodeMirror-cursor {
  border-left-color: #202124;
}

.CodeMirror-selected {
  background: rgba(32, 33, 36, 0.14) !important;
}

.cm-keyword,
.cm-def {
  color: #003c8f;
  font-weight: 700;
}

.cm-string {
  color: #8a3a00;
}

.cm-comment {
  color: #8a94a6;
  font-style: italic;
}

.cm-number {
  color: #006b3c;
}

.cm-variable-2,
.cm-property,
.cm-attribute {
  color: #005f5f;
}

.cm-tag,
.cm-qualifier {
  color: #6f42c1;
  font-weight: 700;
}

.cm-bracket,
.cm-operator,
.cm-punctuation {
  color: #64748b;
}

.cm-searching,
.cm-todo {
  color: #202124 !important;
  background: var(--accent-soft);
  border-radius: 0;
}

.preview-pane {
  display: grid;
  grid-template-rows: auto 1fr;
}

#preview {
  width: 100%;
  height: 100%;
  border: 0;
  background: #ffffff;
}

#saveState,
#previewStatus {
  color: var(--muted);
}

@media (max-width: 860px) {
  .topbar {
    height: auto;
    align-items: flex-start;
    flex-direction: column;
  }

  .workspace {
    height: auto;
    min-height: calc(100vh - 120px);
    grid-template-columns: 1fr;
    grid-template-rows: minmax(520px, 58vh) minmax(480px, 58vh);
  }

  .actions {
    width: 100%;
  }

  .actions button {
    flex: 1;
  }

  .preview-bar {
    height: auto;
    min-height: 38px;
  }
}