:root {
  --bg: #1e1e2e;
  --surface: #282840;
  --border: #3a3a55;
  --text: #cdd6f4;
  --text-muted: #6c7086;
  --accent: #cba6f7;
  --accent2: #89b4fa;
  --green: #a6e3a1;
  --red: #f38ba8;
  --yellow: #f9e2af;
  --orange: #fab387;
  --radius: 8px;
  --mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', 'Consolas', monospace;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

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

body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  display: flex;
}

/* ---- main container ---- */
#app {
  display: flex;
  flex-direction: column;
  width: 100%;
  height: 100vh;
}

/* ---- toolbar ---- */
#toolbar {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 16px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

#toolbar .brand {
  font-family: var(--mono);
  font-size: 15px;
  font-weight: 700;
  color: var(--accent);
  margin-right: 12px;
  letter-spacing: -0.5px;
}
#toolbar .brand span { color: var(--accent2); }

#toolbar button,
#toolbar select {
  font-family: inherit;
  font-size: 13px;
  padding: 6px 14px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  cursor: pointer;
  transition: background .15s, border-color .15s;
}
#toolbar button:hover,
#toolbar select:hover {
  background: #303050;
  border-color: #555;
}

#btn-run {
  background: var(--accent) !important;
  color: #1e1e2e !important;
  border-color: var(--accent) !important;
  font-weight: 600;
}
#btn-run:hover { filter: brightness(1.1); }

#toolbar .spacer { flex: 1; }

/* ---- split panels ---- */
#panels {
  display: flex;
  flex: 1;
  overflow: hidden;
}

#editor-panel, #output-panel {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
}

#editor-panel {
  border-right: 1px solid var(--border);
}

.panel-header {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-muted);
  padding: 6px 14px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

/* ---- editor ---- */
#editor-wrap {
  flex: 1;
  display: flex;
  overflow: hidden;
  position: relative;
}

#line-numbers {
  width: 48px;
  padding: 12px 8px 12px 0;
  text-align: right;
  font-family: var(--mono);
  font-size: 14px;
  line-height: 1.6;
  color: var(--text-muted);
  background: var(--bg);
  overflow: hidden;
  user-select: none;
  flex-shrink: 0;
  white-space: pre;
}

#editor {
  flex: 1;
  background: transparent;
  color: var(--text);
  border: none;
  outline: none;
  font-family: var(--mono);
  font-size: 14px;
  line-height: 1.6;
  padding: 12px 14px 12px 0;
  tab-size: 4;
  overflow: auto;
  white-space: pre;
  caret-color: var(--accent);
}
#editor:empty::before {
  content: attr(data-placeholder);
  color: var(--text-muted);
}
#editor::selection { background: rgba(203,166,247,0.25); }

/* ---- syntax highlighting ---- */
#editor .kw { color: #cba6f7; }
#editor .ty { color: #89b4fa; }
#editor .s  { color: #a6e3a1; }
#editor .c  { color: #6c7086; font-style: italic; }
#editor .n  { color: #fab387; }
#editor .f  { color: #89dceb; }
#editor .tm { color: #f5c842; }
#editor .te { color: #f5c842; }

/* ---- completion dropdown ---- */
#completion-menu {
  position: absolute;
  z-index: 100;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  box-shadow: 0 4px 16px rgba(0,0,0,.4);
  min-width: 180px;
  max-height: 200px;
  overflow-y: auto;
  display: none;
  font-family: var(--mono);
  font-size: 13px;
}
#completion-menu .item {
  padding: 5px 12px;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
}
#completion-menu .item:hover,
#completion-menu .item.active {
  background: #383860;
}
#completion-menu .item .label { color: var(--text); }
#completion-menu .item .kind {
  color: var(--text-muted);
  font-size: 11px;
  margin-left: 16px;
}

/* ---- output ---- */
#output-wrap {
  flex: 1;
  overflow: auto;
  padding: 12px 14px;
  background: #11111b;
  font-family: var(--mono);
  font-size: 14px;
  line-height: 1.6;
  white-space: pre-wrap;
  word-break: break-all;
}

#output-wrap .line { }
#output-wrap .error { color: var(--red); }
#output-wrap .info  { color: var(--text-muted); }

/* ---- status bar ---- */
#statusbar {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 4px 16px;
  background: var(--surface);
  border-top: 1px solid var(--border);
  font-size: 12px;
  color: var(--text-muted);
  flex-shrink: 0;
}
#statusbar .status-ok { color: var(--green); }
#statusbar .status-err { color: var(--red); }

/* ---- scrollbar ---- */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: #555; }

/* ---- responsive ---- */
@media (max-width: 700px) {
  #panels { flex-direction: column; }
  #editor-panel { border-right: none; border-bottom: 1px solid var(--border); }
  #editor-panel { flex: 0 0 55%; }
  #output-panel { flex: 1; }
}