:root {
  color-scheme: light;
  --text: #263146;
  --background: #f7f8fa;
  --surface: #fff;
  --bar: #fdfdfe;
  --border: #dfe5ed;
  --muted: #66748a;
  --brand: #224d41;
  --button-text: #35435a;
  --button-hover: #f2f5f8;
  --primary: #265b4b;
  --primary-hover: #1d4b3c;
  --editor-text: #37435c;
  --preview: #edf0f4;
  --accent: #488571;
  --syntax-command: #8051a5;
  --syntax-value: #226e73;
  --syntax-punctuation: #966332;
  --log-background: #202836;
  --log-text: #c7d5e5;
  font: 13px Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--text);
  background: var(--background);
}
:root[data-theme="dark"] {
  color-scheme: dark;
  --text: #dce3ee;
  --background: #151a23;
  --surface: #1c2330;
  --bar: #202836;
  --border: #354155;
  --muted: #a2aec2;
  --brand: #8bd4b7;
  --button-text: #dce3ee;
  --button-hover: #2b3546;
  --primary: #306e59;
  --primary-hover: #398168;
  --editor-text: #dce3ee;
  --preview: #121720;
  --accent: #8bd4b7;
  --syntax-command: #c6a4ee;
  --syntax-value: #8dd4c5;
  --syntax-punctuation: #e5b885;
  --log-background: #10151e;
  --log-text: #c7d5e5;
}
* { box-sizing: border-box; }
[hidden] { display: none !important; }
body { margin: 0; height: 100vh; height: 100dvh; display: flex; flex-direction: column; }
header {
  min-height: 64px; padding: 12px 24px; background: var(--surface);
  border-bottom: 1px solid var(--border); display: flex; align-items: center;
  justify-content: space-between; gap: 16px; flex-shrink: 0;
}
.brand { font: 700 29px Georgia, serif; color: var(--brand); letter-spacing: -1px; white-space: nowrap; }
.brand small { font: 12px system-ui; letter-spacing: 0; margin-left: 18px; color: var(--muted); }
.actions { display: flex; align-items: center; gap: 8px; }
button, summary {
  font: inherit; cursor: pointer; border: 1px solid var(--border); border-radius: 7px;
  background: var(--surface); color: var(--button-text); padding: 8px 12px; white-space: nowrap;
}
button:hover, summary:hover { background: var(--button-hover); }
button:focus-visible, summary:focus-visible, select:focus-visible {
  outline: 2px solid var(--accent); outline-offset: 2px;
}
button:disabled { opacity: .5; cursor: default; }
.primary { background: var(--primary); color: white; border-color: var(--primary); }
.primary:hover { background: var(--primary-hover); }
.icon-button { width: 34px; height: 34px; display: inline-flex; align-items: center; justify-content: center; padding: 7px; border-color: transparent; }
svg { width: 18px; height: 18px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; flex-shrink: 0; }
.action-button { display: inline-flex; align-items: center; justify-content: center; gap: 8px; }
.action-button > svg { width: 16px; height: 16px; }
#theme .sun, :root[data-theme="dark"] #theme .moon { display: none; }
:root[data-theme="dark"] #theme .sun { display: block; }
.menu { position: relative; }
summary { list-style: none; }
summary::-webkit-details-marker { display: none; }
.menu[open] > summary { background: var(--button-hover); }
.action-button > .chevron { width: 12px; height: 12px; margin-left: 2px; color: var(--muted); transition: transform .15s ease; }
.menu[open] > summary .chevron { transform: rotate(180deg); }
@media (prefers-reduced-motion: reduce) { .action-button > .chevron { transition: none; } }
.menu-panel {
  position: absolute; z-index: 20; top: calc(100% + 8px); right: 0;
  width: min(300px, calc(100vw - 24px)); padding: 6px; border: 1px solid var(--border);
  border-radius: 10px; background: var(--surface); box-shadow: 0 12px 36px #0002;
}
#open-menu .menu-panel { left: 0; right: auto; }
.menu-panel > button, #recent-projects > button { display: block; width: 100%; text-align: left; border: 0; padding: 11px 10px; white-space: normal; overflow-wrap: anywhere; }
.recent-section { border-top: 1px solid var(--border); margin-top: 6px; padding-top: 10px; max-height: 40vh; overflow-y: auto; }
.recent-heading { display: flex; align-items: center; justify-content: space-between; gap: 8px; padding: 0 10px 6px; }
.recent-heading > strong, #recent-projects > small { font-size: 11px; color: var(--muted); }
#recent-projects > small { display: block; padding: 0 10px 6px; }
.menu-panel small { display: block; font-size: 11px; line-height: 1.5; color: var(--muted); margin-top: 4px; }
.help-panel { padding: 16px; font-size: 12px; line-height: 1.6; }
.help-panel { max-height: calc(100dvh - 100px); overflow-y: auto; }
.help-panel p { color: var(--muted); margin: 8px 0 16px; }
.help-panel dl { display: grid; grid-template-columns: 1fr auto; gap: 8px; }
.help-panel dt, .help-panel dd { margin: 0; }
.help-panel dd { color: var(--muted); }
main { display: grid; grid-template-columns: 45% 55%; min-height: 0; flex: 1; }
.editor-pane, .preview-pane { display: flex; flex-direction: column; min-height: 0; min-width: 0; }
.editor-pane { background: var(--surface); border-right: 1px solid var(--border); }
.pane-bar {
  min-height: 46px; display: flex; align-items: center; justify-content: space-between;
  gap: 8px; padding: 6px 16px; border-bottom: 1px solid var(--border); font-size: 12px;
  flex-shrink: 0; background: var(--bar);
}
.pane-bar button { font-size: 11px; padding: 6px 9px; }
.locate-switch { display: inline-flex; align-items: center; gap: 8px; min-height: 30px; font-size: 11px; color: var(--button-text); white-space: nowrap; cursor: pointer; }
.locate-switch input { appearance: none; position: relative; width: 30px; height: 18px; margin: 0; border: 1px solid var(--muted); border-radius: 9px; background: var(--muted); cursor: pointer; flex-shrink: 0; }
.locate-switch input::before { content: ""; position: absolute; top: 2px; left: 2px; width: 12px; height: 12px; border-radius: 50%; background: white; }
.locate-switch input:checked { background: var(--primary); border-color: var(--primary); }
.locate-switch input:checked::before { transform: translateX(12px); }
.locate-switch input:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.pane-label { font-weight: 600; }
.file-context, .preview-context { display: flex; align-items: center; gap: 12px; min-width: 0; }
.subtle { color: var(--muted); font-size: 11px; }
#filename { min-width: 0; max-width: 100%; border: 0; background: transparent; color: var(--muted); font: inherit; padding: 4px; text-overflow: ellipsis; }
#filename option { background: var(--surface); color: var(--text); }
.source-marker { position: absolute; pointer-events: none; border: 1px solid #488571; background: #48857118; border-radius: 3px; animation: source-marker-fade 5s linear forwards; }
@keyframes source-marker-fade { from { opacity: 1; } to { opacity: 0; } }
#editor { flex: 1; min-height: 0; overflow: hidden; background: var(--surface); }
#editor .cm-editor { height: 100%; color: var(--editor-text); font-size: 13px; }
#editor .cm-editor.cm-focused { outline: none; }
#editor .cm-scroller { overflow: auto; font: 13px/1.8 "SFMono-Regular", Consolas, monospace; }
#editor .cm-content { padding: 18px 0; caret-color: var(--text); }
#editor .cm-line { padding: 0 18px 0 12px; }
#editor .cm-gutters { background: var(--surface); color: var(--muted); border: 0; padding-left: 8px; }
#editor .cm-activeLine, #editor .cm-activeLineGutter { background: var(--button-hover); }
#editor .cm-cursor { border-left-color: var(--text); }
#editor .cm-selectionBackground, #editor .cm-focused .cm-selectionBackground { background: color-mix(in srgb, var(--accent) 25%, transparent); }
#editor .cm-panels { background: var(--bar); color: var(--text); border-color: var(--border); }
#editor .cm-search { display: flex; align-items: center; flex-wrap: wrap; gap: 6px; padding: 10px 28px 10px 12px; font: 12px system-ui; }
#editor .cm-textfield, #editor .cm-button { font: inherit; background: var(--surface); color: var(--text); border: 1px solid var(--border); border-radius: 4px; }
#editor .cm-textfield { min-width: 0; max-width: 160px; }
.editor-footer { min-height: 30px; display: flex; align-items: center; justify-content: space-between; gap: 8px; padding: 0 16px; font-size: 11px; color: var(--muted); border-top: 1px solid var(--border); }
#preview { flex: 1; min-height: 0; overflow: auto; padding: 24px; display: flex; flex-direction: column; align-items: center; gap: 24px; background: var(--preview); }
.page { color-scheme: light; position: relative; flex-shrink: 0; background: #fff; box-shadow: 0 3px 15px #16233415; }
.welcome { margin: auto; color: var(--muted); max-width: 300px; line-height: 1.7; text-align: center; }
.welcome strong { color: var(--text); font-weight: 500; font-size: 15px; }
footer { min-height: 36px; border-top: 1px solid var(--border); display: flex; align-items: center; gap: 9px; padding: 0 16px; background: var(--surface); font-size: 11px; flex-shrink: 0; }
.dot { width: 6px; height: 6px; flex-shrink: 0; border-radius: 100%; background: var(--accent); }
#status { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
#toggle-log { margin-left: auto; flex-shrink: 0; border: 0; padding: 6px 8px; font-size: inherit; color: var(--muted); }
#toggle-log[aria-expanded="true"] { background: var(--button-hover); color: var(--brand); }
#log { margin: 0; background: var(--log-background); color: var(--log-text); font: 11px/1.7 monospace; max-height: min(220px, 30vh); overflow: auto; padding: 16px; white-space: pre-wrap; flex-shrink: 0; }
@media (max-width: 1000px) { .brand small, .auto-preview { display: none; } }
@media (max-width: 700px) {
  header { position: relative; padding: 10px 12px; min-height: 56px; gap: 8px; }
  .brand { font-size: 24px; }
  header .actions { gap: 4px; }
  header button, header summary { font-size: 11px; padding: 7px 8px; }
  header .action-button { gap: 6px; }
  header .action-button > svg { width: 14px; height: 14px; }
  header .action-button > .chevron { width: 10px; height: 10px; margin-left: 0; }
  #compile { width: 30px; height: 30px; padding: 6px; }
  .compile-label { display: none; }
  header .icon-button { width: 30px; height: 30px; padding: 6px; }
  main { grid-template-columns: 1fr; grid-template-rows: 48% 52%; }
  .editor-pane { border-right: 0; border-bottom: 1px solid var(--border); }
  .pane-bar { padding: 4px 12px; min-height: 40px; }
  #preview { padding: 16px; }
  #open-menu { position: static; }
  #open-menu .menu-panel { left: 12px; right: auto; }
  .editor-footer, footer { padding: 0 12px; font-size: 10px; }
}
@media (max-width: 360px) { header { flex-wrap: wrap; } header nav { margin-left: auto; } }

#loading-progress { width: 5rem; height: .45rem; flex-shrink: 0; accent-color: var(--accent); }