body {
  font-family: monospace;
  margin: 0;
  padding: 1rem;
  background: #fafafa;
  color: #1f2937;
}

.panel {
  border: 1px solid #d4d4d4;
  border-radius: 8px;
  padding: 0.7rem;
  background: #fff;
}

#printOut {
  margin: 0;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  word-break: break-word;
}

.output-panel {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.output-actions {
  display: flex;
  justify-content: flex-end;
}

.row {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-bottom: 0.5rem;
}

button {
  font: inherit;
  padding: 0.3rem 0.6rem;
}

select,
input {
  font: inherit;
}

.test-library {
  border: 1px solid #d1d5db;
  border-radius: 6px;
  padding: 0.6rem;
  margin-bottom: 0.6rem;
  background: #f8fafc;
}

.test-row {
  align-items: center;
}

#testSelect {
  min-width: 14rem;
  max-width: 100%;
  padding: 0.2rem 0.35rem;
  border: 1px solid #cbd5e1;
  border-radius: 4px;
  background: #fff;
}

.inline-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  color: #334155;
}

.test-library-status {
  color: #475569;
  font-size: 0.92em;
  min-height: 1.2rem;
}

.test-library-status.error {
  color: #b91c1c;
}

.editor-shell {
  position: relative;
  border: 1px solid #c8c8c8;
  border-radius: 6px;
  background: #ffffff;
  overflow: hidden;
  min-height: 12rem;
}

.editor-overlay,
.editor-input {
  font: inherit;
  line-height: 1.5;
  letter-spacing: 0;
  tab-size: 4;
  padding: 0.75rem;
  white-space: pre-wrap;
  box-sizing: border-box;
}

.editor-overlay {
  margin: 0;
  min-height: 12rem;
  pointer-events: none;
  color: #111827;
  overflow-wrap: break-word;
  word-break: break-word;
}

.editor-input {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  min-height: 12rem;
  margin: 0;
  border: 0;
  outline: none;
  resize: none;
  overflow: hidden;
  background: transparent;
  color: transparent;
  caret-color: #111827;
}

.editor-input::selection {
  background: rgba(59, 130, 246, 0.22);
}

.status {
  margin-top: 0.5rem;
  color: #555;
}

.parse-hint {
  margin-top: 0.35rem;
  color: #4b5563;
  font-size: 0.95em;
  white-space: pre-wrap;
  overflow-wrap: break-word;
  word-break: normal;
}

.parse-assoc {
  color: #6b7280;
  font-size: 0.9em;
}

/* --- Token colours --- */

.tok-string {
  color: #0f766e;
}

.tok-call {
  color: #1d4ed8;
}

.tok-operator {
  color: #b45309;
  font-weight: 700;
}

.tok-literal {
  color: #7c3aed;
}

.tok-bracket {
  font-weight: 700;
}

.tok-placeholder {
  color: #9ca3af;
}

.tok-chain-op {
  position: relative;
  padding: 0;
}

/* Chain-step underline colours */
.tok-chain-step-1 { box-shadow: inset 0 2px 0 rgba(220, 38, 38, 0.72); }
.tok-chain-step-2 { box-shadow: inset 0 2px 0 rgba(234, 88, 12, 0.72); }
.tok-chain-step-3 { box-shadow: inset 0 2px 0 rgba(202, 138, 4, 0.72); }
.tok-chain-step-4 { box-shadow: inset 0 2px 0 rgba(101, 163, 13, 0.72); }
.tok-chain-step-5 { box-shadow: inset 0 2px 0 rgba(8, 145, 178, 0.72); }
.tok-chain-step-6 { box-shadow: inset 0 2px 0 rgba(37, 99, 235, 0.72); }

/* Visual group boxes for chain steps */
.group-box {
  position: relative;
  display: inline;
}
.group-box-1 { background: rgba(220, 38, 38, 0.07); box-shadow: 0 0 0 1px rgba(220, 38, 38, 0.35); border-radius: 3px; }
.group-box-2 { background: rgba(234, 88, 12, 0.07);  box-shadow: 0 0 0 1px rgba(234, 88, 12, 0.35);  border-radius: 3px; }
.group-box-3 { background: rgba(202, 138, 4, 0.07);  box-shadow: 0 0 0 1px rgba(202, 138, 4, 0.35);  border-radius: 3px; }
.group-box-4 { background: rgba(101, 163, 13, 0.07); box-shadow: 0 0 0 1px rgba(101, 163, 13, 0.35); border-radius: 3px; }
.group-box-5 { background: rgba(8, 145, 178, 0.07);  box-shadow: 0 0 0 1px rgba(8, 145, 178, 0.35);  border-radius: 3px; }
.group-box-6 { background: rgba(37, 99, 235, 0.07);  box-shadow: 0 0 0 1px rgba(37, 99, 235, 0.35);  border-radius: 3px; }

.phrase-box {
  border-radius: 2px;
}

.phrase-tone-0 { box-shadow: none; }
.phrase-tone-1 { box-shadow: none; }

/* Definition signature highlight */
.def-sig {
  font-weight: 700;
}

/* Bracket depth colours */
.bracket-0 { color: #6b7280; }
.bracket-1 { color: #2563eb; }
.bracket-2 { color: #0f766e; }
.bracket-3 { color: #b45309; }

/* Active token highlight */
.is-active {
  background: rgba(245, 158, 11, 0.2);
  border-radius: 3px;
  box-shadow: inset 0 -1px 0 rgba(217, 119, 6, 0.55);
}

/* --- Source viewer --- */

#show-source-nav {
  position: sticky;
  top: 0;
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  align-items: center;
  padding: 0.4rem 0.75rem;
  background: #f9fafb;
  border: 1px solid #d4d4d4;
  border-radius: 6px;
  margin-bottom: 0.5rem;
  font-size: 0.9em;
  z-index: 10;
}

#show-source-nav::before {
  content: "sources:";
  color: #6b7280;
  font-size: 0.85em;
  margin-right: 0.25rem;
}

#show-source-nav a {
  color: #2563eb;
}

.show-source-block {
  border: 1px solid #d4d4d4;
  border-radius: 6px;
  margin-bottom: 0.75rem;
  overflow: hidden;
}

.show-source-block > summary {
  cursor: pointer;
  padding: 0.4rem 0.75rem;
  background: #f9fafb;
  font-weight: 600;
  font-size: 0.9em;
  user-select: none;
  border-bottom: 1px solid transparent;
}

.show-source-block[open] > summary {
  border-bottom-color: #d4d4d4;
}

.show-source-block > summary a {
  color: #2563eb;
  pointer-events: none; /* clicking the summary toggles; use nav links to open files */
}

.show-source-block pre.show_source {
  margin: 0;
  padding: 0.75rem 1rem;
  overflow-y: scroll;
  max-height: 420px;
  background: #fff;
  font-size: 0.85em;
  line-height: 1.5;
}