:root {
  --bg: #0e1015;
  --panel: #151821;
  --panel-2: #1b1f2a;
  --line: #262b38;
  --text: #d9dde7;
  --muted: #8a92a6;
  --accent: #39d98a;
  --accent-ink: #062414;
  --error: #ff6b6b;
  --warning: #ffc857;
  --mono: ui-monospace, "JetBrains Mono", "SFMono-Regular", Menlo, Consolas, monospace;
  color-scheme: dark;
}

* { box-sizing: border-box; }
html, body { height: 100%; margin: 0; }
body {
  background: var(--bg);
  color: var(--text);
  font: 14px/1.4 system-ui, -apple-system, "Segoe UI", sans-serif;
  display: flex;
  flex-direction: column;
}

header {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 8px 16px;
  border-bottom: 1px solid var(--line);
  background: var(--panel);
  flex-wrap: wrap;
}
.brand { font-weight: 600; letter-spacing: 0.2px; display: flex; align-items: center; gap: 8px; }
.brand .sub { color: var(--muted); font-weight: 400; }
.brand .dot { width: 10px; height: 10px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 8px var(--accent); }
.grow { flex: 1; }
.muted { color: var(--muted); }

.field { display: flex; align-items: center; gap: 6px; color: var(--muted); font-size: 13px; }
select, button {
  font: inherit;
  color: var(--text);
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 5px 10px;
}
select { max-width: 280px; }
button { cursor: pointer; }
button:hover { border-color: #3a4152; }
button:disabled { opacity: 0.5; cursor: default; }
button.primary { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); font-weight: 600; padding: 6px 16px; }
button.primary:hover { filter: brightness(1.08); }
button.ghost { background: transparent; }
button.small { padding: 2px 8px; font-size: 12px; }

.status { font-size: 13px; color: var(--muted); }
.status.ok { color: var(--accent); }
.status.error { color: var(--error); }
.status.busy::before {
  content: ""; display: inline-block; width: 10px; height: 10px; margin-right: 6px; vertical-align: -1px;
  border: 2px solid var(--muted); border-top-color: transparent; border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

main {
  flex: 1;
  min-height: 0;
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
}

/* ---- editor */
.editor-pane { display: flex; flex-direction: column; min-height: 0; border-right: 1px solid var(--line); }
.tabs { display: flex; gap: 2px; padding: 6px 8px 0; background: var(--panel); border-bottom: 1px solid var(--line); overflow-x: auto; }
.tab {
  font: 13px var(--mono);
  padding: 6px 12px;
  border: 1px solid transparent;
  border-bottom: none;
  border-radius: 6px 6px 0 0;
  background: transparent;
  color: var(--muted);
  white-space: nowrap;
  display: flex;
  align-items: center;
  gap: 6px;
}
.tab.active { background: var(--bg); color: var(--text); border-color: var(--line); }
.tab .bad { width: 7px; height: 7px; border-radius: 50%; background: var(--error); }
.tab .x { color: var(--muted); padding: 0 2px; border-radius: 3px; }
.tab .x:hover { background: var(--line); color: var(--text); }
.tab.add { color: var(--muted); }
.editor { flex: 1; min-height: 0; position: relative; }
.editor .CodeMirror, .editor textarea { position: absolute; inset: 0; height: 100%; width: 100%; }
.editor textarea { background: var(--bg); color: var(--text); border: 0; padding: 12px; font: 13px/1.5 var(--mono); resize: none; outline: none; }

.CodeMirror { background: var(--bg); color: #d6dbe6; font: 13px/1.55 var(--mono); }
.CodeMirror-gutters { background: var(--bg); border-right: 1px solid var(--line); }
.CodeMirror-linenumber { color: #4b5366; }
.CodeMirror-cursor { border-left: 2px solid var(--accent); }
.CodeMirror-selected, .CodeMirror-focused .CodeMirror-selected { background: #27324a; }
.CodeMirror-matchingbracket { color: var(--accent) !important; text-decoration: underline; }
.cm-keyword { color: #c792ea; }
.cm-def { color: #82aaff; }
.cm-variable-2, .cm-variable-3, .cm-type { color: #ffcb6b; }
.cm-string { color: #c3e88d; }
.cm-number { color: #f78c6c; }
.cm-comment { color: #5f6b82; font-style: italic; }
.cm-meta { color: #89ddff; }
.cm-atom, .cm-builtin { color: #f78c6c; }
.cm-operator { color: #89ddff; }
.diag-gutter { width: 14px; }
.diag-marker { display: block; width: 8px; height: 8px; margin: 6px 0 0 3px; border-radius: 50%; cursor: help; }
.diag-marker.error { background: var(--error); }
.diag-marker.warning { background: var(--warning); }
.line-error { background: rgba(255, 107, 107, 0.10); }
.line-warning { background: rgba(255, 200, 87, 0.07); }

/* ---- simulator */
.sim-pane { display: flex; flex-direction: column; min-height: 0; padding: 12px 16px; gap: 10px; }
.sim-toolbar { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.bezel {
  position: relative;
  width: 100%;
  aspect-ratio: 2 / 1;
  max-height: 55vh;
  margin: 0 auto;
  background: #050506;
  border-radius: 10px;
  padding: 10px;
  box-shadow: 0 0 0 1px #000, 0 0 0 7px #1d2029, 0 10px 30px rgba(0, 0, 0, 0.5);
}
.bezel iframe { width: 100%; height: 100%; border: 0; display: block; background: #050506; }
.overlay {
  position: absolute; inset: 10px;
  display: flex; align-items: center; justify-content: center; text-align: center;
  padding: 16px;
  background: rgba(5, 5, 6, 0.86);
  color: var(--muted);
  font-size: 13px;
  white-space: pre-wrap;
}
.overlay[hidden] { display: none; }
.overlay.crash { color: var(--error); font-family: var(--mono); }
.keys { display: flex; gap: 6px; align-items: center; flex-wrap: wrap; }
.keys button { min-width: 40px; padding: 6px 10px; font-size: 15px; }
.keys button.wide { min-width: 70px; font-size: 13px; }
.keys button:active { background: var(--line); }
.hint { font-size: 12px; margin-left: 6px; }

.console-head { display: flex; justify-content: space-between; align-items: center; color: var(--muted); font-size: 12px; text-transform: uppercase; letter-spacing: 0.6px; }
.console {
  flex: 1;
  min-height: 90px;
  overflow: auto;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 8px 10px;
  font: 12px/1.5 var(--mono);
  white-space: pre-wrap;
  word-break: break-word;
}
.console .line { color: var(--muted); }
.console .line.app { color: var(--text); }
.console .line.ok { color: var(--accent); }
.console .line.error { color: var(--error); }
.console .line.warning { color: var(--warning); }
.console .line.link { cursor: pointer; }
.console .line.link:hover { text-decoration: underline; }

@media (max-width: 900px) {
  main { grid-template-columns: 1fr; grid-template-rows: minmax(320px, 1fr) auto; }
  .editor-pane { border-right: 0; border-bottom: 1px solid var(--line); }
  header, .sim-pane { padding-left: 16px; padding-right: 16px; }
  .hint { display: none; }
  .console { max-height: 30vh; }
}