:root {
  --bg: #ffffff;
  --panel: #f6f7f9;
  --border: #e2e4e8;
  --text: #1d2126;
  --muted: #6b7280;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --accent-text: #ffffff;
  --warn: #b45309;
  --err: #dc2626;
  --sel: #dbe7ff;
  --gutter: #9aa1ab;
  --tok-keyword: #7c3aed;
  --tok-def: #2563eb;
  --tok-string: #15803d;
  --tok-number: #c2410c;
  --tok-comment: #8a919b;
  --tok-builtin: #0e7490;
  --tok-meta: #b45309;
  --mono: ui-monospace, "SF Mono", "Cascadia Code", "JetBrains Mono", Menlo, Consolas, monospace;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #15171b;
    --panel: #1b1e23;
    --border: #2b2f36;
    --text: #e4e6ea;
    --muted: #8b929c;
    --accent: #3b82f6;
    --accent-hover: #60a5fa;
    --warn: #f59e0b;
    --err: #f87171;
    --sel: #263a5c;
    --gutter: #5c636d;
    --tok-keyword: #c4a5ff;
    --tok-def: #7cb3ff;
    --tok-string: #86d39b;
    --tok-number: #fdba74;
    --tok-comment: #6b727c;
    --tok-builtin: #67d4e6;
    --tok-meta: #fbbf24;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html, body { height: 100%; margin: 0; }
body {
  background: var(--bg);
  color: var(--text);
  font: 14px/1.45 var(--sans);
  display: flex;
  flex-direction: column;
}

/* ---- top bar ---- */
.bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 8px 12px;
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
}
.group { display: flex; align-items: center; gap: 8px; }
.logo { display: flex; align-items: center; }
.logo img { height: 32px; width: auto; display: block; }

.btn {
  font: inherit;
  color: var(--text);
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 5px 12px;
  height: 32px;
  cursor: pointer;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.btn:hover { border-color: var(--muted); }
.btn:focus-visible, .tab:focus-visible { outline: 2px solid var(--accent); outline-offset: 1px; }
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-text); font-weight: 600; }
.btn.primary:hover { background: var(--accent-hover); border-color: var(--accent-hover); }
.btn.ghost { background: transparent; border-color: transparent; }
.btn.ghost:hover { border-color: var(--border); }
.btn.small { height: 26px; padding: 2px 10px; font-size: 12px; }
select.btn { padding-right: 8px; }
.run-icon {
  width: 0; height: 0;
  border-left: 8px solid currentColor;
  border-top: 5px solid transparent;
  border-bottom: 5px solid transparent;
}
.running .run-icon { width: 9px; height: 9px; border: 0; background: currentColor; border-radius: 1px; }

.chip {
  font-size: 12px;
  color: var(--muted);
  padding: 3px 10px;
  border: 1px solid var(--border);
  border-radius: 999px;
  white-space: nowrap;
}
.chip:empty { display: none; }
.chip::before {
  content: "";
  display: inline-block;
  width: 7px; height: 7px;
  border-radius: 50%;
  margin-right: 6px;
  vertical-align: 1px;
  background: var(--chip-dot, var(--muted));
}
.chip.ok { --chip-dot: #22c55e; }
.chip.busy { --chip-dot: var(--warn); }
.chip.off { --chip-dot: var(--err); }

/* ---- editor + panel ---- */
main {
  flex: 1;
  min-height: 0;
  display: flex;
  flex-direction: column;
  --panel-h: 38%;
}
#editor { flex: 1; min-height: 80px; overflow: hidden; }
#splitter {
  height: 6px;
  cursor: row-resize;
  border-top: 1px solid var(--border);
  background: var(--panel);
  touch-action: none;
}
#splitter:hover { background: var(--border); }
#panel {
  height: var(--panel-h);
  min-height: 90px;
  display: flex;
  flex-direction: column;
  background: var(--panel);
}
.tabs {
  display: flex;
  align-items: center;
  gap: 2px;
  padding: 0 8px;
  border-bottom: 1px solid var(--border);
}
.tab {
  font: inherit;
  font-size: 13px;
  color: var(--muted);
  background: none;
  border: 0;
  border-bottom: 2px solid transparent;
  padding: 7px 10px 6px;
  cursor: pointer;
}
.tab:hover { color: var(--text); }
.tab.active { color: var(--text); border-bottom-color: var(--accent); }
.spacer { flex: 1; }
.muted { color: var(--muted); }
.small { font-size: 12px; }
#versions { margin-right: 8px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

.pane { display: none; flex: 1; min-height: 0; overflow: auto; }
.pane.active { display: block; }
#pane-terminal.active { display: flex; }
#terminal { flex: 1; min-width: 0; padding: 6px 0 0 8px; background: var(--bg); }
pre {
  margin: 0;
  padding: 10px 14px;
  font: 13px/1.5 var(--mono);
  white-space: pre-wrap;
  word-break: break-word;
}
.muted-empty, .sys { color: var(--muted); }
.sys { font-style: italic; }
.err { color: var(--err); }
.notice { color: var(--warn); }

/* ---- CodeMirror theme ---- */
.CodeMirror {
  height: 100%;
  font: 14px/1.55 var(--mono);
  background: var(--bg);
  color: var(--text);
}
.CodeMirror-gutters { background: var(--bg); border-right: 0; }
.CodeMirror-linenumber { color: var(--gutter); padding: 0 12px 0 8px; }
.CodeMirror-cursor { border-left-color: var(--text); }
.CodeMirror-selected, .CodeMirror-focused .CodeMirror-selected { background: var(--sel); }
.CodeMirror-matchingbracket { color: inherit !important; background: var(--sel); }
.CodeMirror-lines { padding: 10px 0; }
.cm-keyword { color: var(--tok-keyword); }
.cm-def { color: var(--tok-def); }
.cm-string { color: var(--tok-string); }
.cm-number { color: var(--tok-number); }
.cm-comment { color: var(--tok-comment); font-style: italic; }
.cm-builtin { color: var(--tok-builtin); }
.cm-meta { color: var(--tok-meta); }
.cm-variable-2 { color: var(--text); }
.cm-property { color: var(--text); }

/* ---- toast ---- */
#toast {
  position: fixed;
  left: 50%;
  bottom: 24px;
  transform: translateX(-50%) translateY(20px);
  background: var(--text);
  color: var(--bg);
  padding: 8px 14px;
  border-radius: 6px;
  font-size: 13px;
  opacity: 0;
  pointer-events: none;
  transition: opacity .15s, transform .15s;
}
#toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* ---- about page ---- */
.doc { max-width: 720px; margin: 0 auto; padding: 24px 16px 64px; overflow-wrap: anywhere; }
.doc h1 { font-size: 26px; margin: 8px 0 4px; }
.doc h2 { font-size: 17px; margin: 28px 0 6px; }
.doc p, .doc li { color: var(--text); }
.doc a { color: var(--accent); }
.doc code { font: 13px var(--mono); background: var(--panel); border: 1px solid var(--border); border-radius: 4px; padding: 0 4px; }
.doc ul { padding-left: 20px; }
body.page { display: block; }

@media (max-width: 640px) {
  .bar { padding: 6px 8px; }
  .logo img { height: 26px; }
  .chip { order: 3; }
  #versions { display: none; }
  .CodeMirror { font-size: 13px; }
}