:host { display: block; position: relative; font-family: var(--xo-font, monospace); font-size: var(--xo-font-size, 1em); margin-bottom: var(--xo-margin-bottom, 0.75em) }
:host([mode="exercise"]) .cm-editor { border-left: 3px solid var(--xo-exercise-border, #4CAF50); }
:host([mode="exercise"]) .cm-gutters { border-left: none !important; }
.cm-editor { background: var(--xo-bg, transparent); color: var(--xo-text, inherit); }
.cm-editor.cm-focused { outline: 1px dotted var(--xo-focus-outline, #AAA) !important }
.cm-gutters { background: var(--xo-gutter-bg, inherit) !important; color: var(--xo-gutter-text, #6c6c6c) !important; border-right: 1px solid var(--xo-gutter-border, #ddd) !important; }
.cm-cursor { border-left-color: var(--xo-text, currentColor) !important; }
.cm-selectionBackground { background: var(--xo-selection, #AAA4) !important; }
.cm-focused .cm-selectionBackground { background: var(--xo-selection-focused, #AAA6) !important; }
.cm-tooltip { background: var(--xo-tooltip-bg, #fff) !important; color: var(--xo-tooltip-text, #333) !important; border: 1px solid var(--xo-tooltip-border, #ddd) !important; }
.cm-tooltip-section {
  max-width: 400px;
  height: 1lh;
  text-overflow: ellipsis; /* not working, because width/height must be px(?) */
  padding: 0.3em 0.5em;
  overflow: hidden;
  color: var(--xo-tooltip-text, #333);
}
.cm-lineNumbers { min-width: var(--xo-line-numbers-min-width, 30px) }
.cm-lineNumbers .cm-gutterElement { padding: var(--xo-gutter-element-padding, 0 3px 0 5px) !important; }
.cm-content { padding-left: var(--xo-content-padding-left, 0) !important; }
.cm-activeLine, .cm-activeLineGutter { background: var(--xo-active-line, transparent) !important }
.cm-focused .cm-activeLine,
.cm-focused .cm-activeLineGutter
{
  background: var(--xo-active-line-focused, #AAA2) !important;
}

.run_btn {
  position: absolute; width: 100%; height: 100%; z-index: 999; pointer-events: none;
}
.run_btn button {
  pointer-events: auto;
  position: absolute; right: 2px; top: 2px;
  width: 28px; height: 28px;
  padding: 0; margin: 0;
  border: 2.5px solid transparent;
  border-radius: 50%;
  background-color: var(--xo-btn-icon, currentColor);
  cursor: pointer;
  opacity: 0.4;
  transition: opacity 0.15s ease;
  box-sizing: border-box;
  -webkit-mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Ccircle cx='12' cy='12' r='10' fill='white'/%3E%3C/svg%3E") center / contain no-repeat;
  mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Ccircle cx='12' cy='12' r='10' fill='white'/%3E%3C/svg%3E") center / contain no-repeat;
}
.run_btn button::after {
  content: "";
  position: absolute;
  top: 50%; left: 53%;
  transform: translate(-50%, -50%);
  width: 0; height: 0;
  border-style: solid;
  border-width: 5px 0 5px 8.5px;
  border-color: transparent transparent transparent var(--xo-btn-play, white);
}
.run_btn button:hover { opacity: 0.8; }

/* Running state: spinning arc with stop square */
.run_btn button.running {
  background-color: transparent;
  -webkit-mask: none;
  mask: none;
  border-color: var(--xo-btn-spinner-track, rgba(128,128,128,0.15));
  border-top-color: var(--xo-btn-spinner, #E53935);
  opacity: 1;
  animation: xo-spin 0.8s linear infinite;
}
.run_btn button.running::after {
  width: 8px; height: 8px;
  border: none;
  left: 50%;
  background: var(--xo-btn-spinner, #E53935);
  border-radius: 1px;
}
.run_btn button.running:hover { opacity: 0.7; }
@keyframes xo-spin { to { transform: rotate(360deg); } }

.test-details { position: relative }
.test-details summary {
  cursor: pointer;
  font-size: 0.85em;
  color: var(--xo-test-summary-text, #666);
  padding: 0.3em 0.5em;
  user-select: none;
}
.test-details summary:hover { color: var(--xo-test-summary-hover, #333); }
.test-indicator { font-weight: bold; margin-left: 0.2em; }
.test-indicator.test-pass { color: var(--xo-test-pass, #4CAF50); }
.test-indicator.test-fail { color: var(--xo-test-fail, #E53935); }
.test-indicator.test-error { color: var(--xo-test-error, #FF9800); }

.caml_stdout {
  background: var(--xo-stdout-bg, #E8F6FF);
  color: var(--xo-stdout-text, #141A6A);
  margin: 0;
  padding: 0.2em 0.2em;
  padding-left: 0.7em;
}
.caml_stderr {
  background: var(--xo-stderr-bg, #FDEEEE);
  color: var(--xo-stderr-text, #EB5656);
  margin: 0;
  padding: 0.2em 0.2em;
  padding-left: 0.7em;
}
.caml_meta {
  margin: 0;
  padding: 0.2em 0.5em;
  font-style: italic;
  color: var(--xo-meta-text, #444);
  padding-bottom: 0.5em;
  background: var(--xo-meta-bg, #eee);
}
.caml_html {
  margin: 0;
  padding: 0.2em 0.5em;
  color: var(--xo-text, black);
  border: 1px solid transparent;
  white-space: collapse;
}

.reset_btn_wrap {
  position: absolute; left: 0; bottom: 0; z-index: 999;
  pointer-events: none;
}
.reset_exercise_btn {
  pointer-events: auto;
  cursor: pointer;
  font-size: 0.75em;
  padding: 0.15em 0.5em;
  background: var(--xo-reset-btn-bg, rgba(0,0,0,0.05));
  border: 1px solid var(--xo-reset-btn-border, rgba(0,0,0,0.15));
  color: var(--xo-reset-btn-text, #888);
  opacity: 0.5;
  transition: opacity 0.15s;
}
.reset_exercise_btn:hover {
  opacity: 1;
  background: var(--xo-reset-btn-hover-bg, rgba(0,0,0,0.1));
  color: var(--xo-reset-btn-hover-text, #333);
}

table, tr, td, th {
  border: 1px solid var(--xo-text, black);
  border-collapse: collapse;
  padding: 0.2em;
}