:root {
  --bg: #f4f5f7;
  --panel: #ffffff;
  --ink: #1d2128;
  --muted: #6b7280;
  --line: #dfe2e7;
  --accent: #2f6fdb;
  --warn: #b45309;
  --error: #b91c1c;
  --view: #e9ecf1;
  --code: #f7f8fa;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #15171b;
    --panel: #1c1f24;
    --ink: #e6e8eb;
    --muted: #8b929c;
    --line: #2c3037;
    --accent: #6ea0ff;
    --warn: #f0a050;
    --error: #ff7a7a;
    --view: #202329;
    --code: #16181c;
  }
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  background: var(--bg);
  color: var(--ink);
  font: 13px/1.45 system-ui, -apple-system, "Segoe UI", sans-serif;
}

body { display: flex; }

#panel {
  width: 420px;
  min-width: 320px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 14px 16px;
  background: var(--panel);
  border-right: 1px solid var(--line);
  overflow: auto;
}

header { display: flex; align-items: baseline; gap: 10px; }
h1 { font-size: 17px; margin: 0; letter-spacing: 0.02em; }
.muted { color: var(--muted); }

.row { display: flex; align-items: center; gap: 10px; }
.row span { width: 70px; color: var(--muted); }
.row select { flex: 1; min-width: 0; }

select, textarea {
  font: inherit;
  color: var(--ink);
  background: var(--code);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 5px 7px;
}

.editor-head { display: flex; justify-content: space-between; color: var(--muted); }

#editor {
  flex: 1;
  min-height: 300px;
  resize: vertical;
  font: 12px/1.5 ui-monospace, "Cascadia Code", Consolas, monospace;
  white-space: pre;
  tab-size: 2;
}

#editor.bad { border-color: var(--error); }

.settings { display: flex; gap: 12px; }
.settings label { flex: 1; display: flex; flex-direction: column; gap: 3px; color: var(--muted); }

.stats { font-variant-numeric: tabular-nums; }

.selection {
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 8px 10px;
  background: var(--code);
}

.selection code { font: 12px ui-monospace, Consolas, monospace; }
.selection button {
  margin-left: 6px;
  font: inherit;
  color: var(--accent);
  background: none;
  border: 1px solid var(--line);
  border-radius: 5px;
  padding: 1px 7px;
  cursor: pointer;
}

/* Diagnostics (J5): grouped by code in the panel; the verdict badge and thin-spot labels on the view. */
.diagnostics, .diagnostics ul { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 6px; }
.diagnostics .group { border-left: 3px solid var(--warn); padding: 2px 0 2px 8px; }
.diagnostics .group.error { border-left-color: var(--error); }
.diagnostics .group-head b { font-weight: 600; }
.diagnostics .item { cursor: pointer; border-radius: 5px; padding: 3px 6px; margin-left: -6px; }
.diagnostics .item:hover { background: var(--code); }
.diagnostics .item.focused { background: var(--code); outline: 1px solid var(--accent); }
.diagnostics .item.stale { opacity: 0.5; }
.diagnostics .faces { display: flex; flex-wrap: wrap; gap: 4px 10px; margin-top: 3px; font: 12px ui-monospace, Consolas, monospace; }
.diagnostics .faces i { display: inline-block; width: 9px; height: 9px; border-radius: 2px; margin-right: 4px; }
.diagnostics .cell { color: var(--muted); }
.diagnostics button {
  font: inherit;
  color: var(--accent);
  background: none;
  border: 1px solid var(--line);
  border-radius: 5px;
  padding: 0 6px;
  cursor: pointer;
}
.diagnostics button.feature { font: 12px ui-monospace, Consolas, monospace; color: var(--ink); }
.diagnostics button.resolve { border-color: var(--accent); }

.verdict {
  position: absolute;
  left: 12px;
  top: 10px;
  display: flex;
  align-items: center;
  gap: 4px;
  font: inherit;
  color: var(--ink);
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 3px 10px;
  cursor: pointer;
}
.verdict[hidden] { display: none; }
.verdict i { width: 9px; height: 9px; border-radius: 50%; margin-right: 3px; background: var(--muted); }
.verdict.valid i { background: #2e9e5b; }
.verdict.warn i { background: var(--warn); }
.verdict.error i, .verdict.broken i { background: var(--error); }
.verdict.error, .verdict.broken { border-color: var(--error); }
.verdict .preview { margin-left: 6px; padding: 0 6px; border-radius: 8px; background: var(--code); color: var(--muted); font-size: 11px; }

.spot-labels { position: absolute; inset: 0; pointer-events: none; overflow: hidden; }
.spot-label {
  position: absolute;
  left: 0;
  top: 0;
  margin: -24px 0 0 6px; /* up and right of the point */
  pointer-events: auto;
  font: 11px ui-monospace, Consolas, monospace;
  color: #fff;
  background: #c0262d;
  border: none;
  border-radius: 4px;
  padding: 1px 5px;
  cursor: pointer;
  white-space: nowrap;
}
.spot-label::before { content: ""; position: absolute; left: -6px; bottom: -4px; width: 6px; height: 6px; border: 2px solid #c0262d; border-radius: 50%; }
.spot-label.focused { outline: 2px solid #fff; box-shadow: 0 0 0 3px #c0262d; }

/* Pinned references (panels/references.js): one row per pin, its status as a chip. */
.references-head { display: flex; justify-content: space-between; align-items: center; color: var(--muted); }
.references button {
  font: inherit;
  color: var(--accent);
  background: none;
  border: 1px solid var(--line);
  border-radius: 5px;
  padding: 1px 7px;
  cursor: pointer;
}
.references button:disabled { color: var(--muted); cursor: default; }
.references ul { list-style: none; margin: 6px 0 0; padding: 0; display: flex; flex-direction: column; gap: 4px; }
.references li { display: flex; align-items: center; gap: 8px; padding: 3px 6px; border-radius: 5px; cursor: pointer; }
.references li:hover, .references li.lit { background: var(--code); }
.references li code { flex: 1; font: 12px ui-monospace, Consolas, monospace; }
.references li button { border: none; color: var(--muted); padding: 0 4px; }
.chip { font-size: 11px; padding: 0 7px; border-radius: 9px; color: #fff; background: var(--muted); }
.chip.resolved { background: #2e8b57; }
.chip.split { background: var(--accent); }
.chip.merged { background: #7c4dcc; }
.chip.ambiguous { background: var(--warn); }
.chip.gone { background: var(--error); }

#view { position: relative; flex: 1; background: var(--view); }
#view canvas { display: block; }

.hint {
  position: absolute;
  left: 12px;
  bottom: 10px;
  color: var(--muted);
  font-size: 12px;
  pointer-events: none;
}

#tooltip {
  position: absolute;
  pointer-events: none;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 5px;
  padding: 3px 7px;
  font: 12px ui-monospace, Consolas, monospace;
  white-space: nowrap;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.12);
}

/* A handle's label and value while it is hovered or dragged. */
.handle-label {
  position: absolute;
  pointer-events: none;
  background: var(--panel);
  border: 1px solid var(--accent);
  border-radius: 5px;
  padding: 3px 7px;
  font: 12px ui-monospace, Consolas, monospace;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.12);
}
.handle-label[hidden] { display: none; }

/* J2: a pattern handle's copy count, − and + beside it; a preview on screen has an amber badge, like its ghost. */
.handle-count {
  position: absolute;
  left: 0;
  top: 0;
  display: flex;
  align-items: center;
  gap: 2px;
  background: var(--panel);
  border: 1px solid var(--accent);
  border-radius: 5px;
  padding: 1px;
  font: 12px ui-monospace, Consolas, monospace;
}
.handle-count span { padding: 0 4px; }
.handle-count button { width: 20px; height: 20px; padding: 0; border: none; border-radius: 3px; background: var(--code); color: inherit; cursor: pointer; }
.handle-count button:disabled { opacity: 0.4; cursor: default; }
.verdict .preview { background: #f59e0b; color: #1d1d1f; }

@media (max-width: 800px) {
  body { flex-direction: column; }
  #panel { width: auto; min-width: 0; max-height: 55vh; border-right: none; border-bottom: 1px solid var(--line); }
  #view { min-height: 45vh; }
}