/* ============================================================
   INSTRUMENTS  (/tools/*)  — additive to codex.css, same world.
   An instrument page is a field-note page whose margin note
   became a working device: same paper, same ink, same measure.
   ============================================================ */

/* ---------- index list ---------- */
.instrument-list { list-style: none; margin: 3rem 0 0; padding: 0; }
.instrument-list li {
  padding: 2rem 0;
  border-top: 1px dotted var(--ink-faint);
}
.instrument-list li:last-child { border-bottom: 1px dotted var(--ink-faint); }
.instrument-list .instrument-name {
  font-family: var(--display);
  font-weight: 500;
  font-size: 1.5rem;
  letter-spacing: -0.01em;
  margin: 0 0 0.4rem;
}
.instrument-list .instrument-name a { color: var(--ink); }
.instrument-list .instrument-name a:hover { color: var(--sanguine); }
.instrument-list p { margin: 0 0 0.55rem; color: var(--ink-mid); line-height: 1.6; }
.instrument-list .from-note {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-soft);
}
.instrument-list .from-note a { color: var(--ink-soft); border-bottom: 1px dotted var(--ink-faint); }
.instrument-list .from-note a:hover { color: var(--sanguine); }

/* ---------- the device ---------- */
.instrument {
  margin: 3.25rem 0;
  padding: clamp(1.5rem, 4vw, 2.5rem);
  background: var(--paper-lit);
  border: 1px solid var(--ink-faint);
}
.instrument__label {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin: 0 0 1.6rem;
}
.instrument .field { margin: 0 0 1.4rem; }
.instrument label {
  display: block;
  font-family: var(--serif);
  font-size: 1rem;
  color: var(--ink);
  margin: 0 0 0.5rem;
  line-height: 1.5;
}
.instrument label .hint {
  display: block;
  font-style: italic;
  font-size: 0.9rem;
  color: var(--ink-soft);
  margin-top: 0.15rem;
}
.instrument input[type="text"],
.instrument textarea {
  width: 100%;
  min-height: 2.9rem;
  padding: 0.6rem 0.85rem;
  background: var(--paper);
  border: 1px solid var(--ink-faint);
  border-radius: 0;
  font-family: var(--serif);
  font-size: 1rem;
  color: var(--ink);
}
.instrument textarea { min-height: 5.2rem; resize: vertical; line-height: 1.55; }
.instrument input::placeholder,
.instrument textarea::placeholder { color: var(--ink-faint); font-style: italic; }
.instrument input:focus,
.instrument textarea:focus { border-color: var(--sanguine); outline: none; }
.instrument .btn-quiet { margin-top: 0.4rem; }
.instrument .btn-quiet[disabled] { opacity: 0.55; cursor: wait; }

/* working state — a quill line, not a spinner */
.instrument__working {
  display: none;
  margin: 1.5rem 0 0;
  font-style: italic;
  color: var(--ink-soft);
}
.instrument__working.visible { display: block; }
.instrument__working::after {
  content: "";
  display: inline-block;
  width: 2.2em;
  margin-left: 0.35em;
  border-bottom: 1px solid var(--ink-faint);
  vertical-align: 0.28em;
  animation: rule-draw 1.4s var(--ease) infinite;
}
@keyframes rule-draw {
  0% { width: 0; border-color: var(--ink-faint); }
  60% { width: 2.2em; border-color: var(--sanguine); }
  100% { width: 2.2em; border-color: var(--ink-faint); }
}
@media (prefers-reduced-motion: reduce) {
  .instrument__working::after { animation: none; width: 2.2em; }
}

/* the returned page */
.instrument__result {
  display: none;
  margin: 2.25rem 0 0;
  padding-top: 1.75rem;
  border-top: 1px solid var(--ink-faint);
}
.instrument__result.visible { display: block; }
.instrument__result-label {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--sanguine-deep);
  margin: 0 0 1.2rem;
}
.instrument__result p { margin: 0 0 1.05rem; line-height: 1.72; color: var(--ink); }
.instrument__result ol { margin: 0 0 1.05rem; padding-left: 1.4rem; }
.instrument__result ol li { margin: 0 0 0.8rem; line-height: 1.65; }
.instrument__error {
  display: none;
  margin: 1.5rem 0 0;
  font-style: italic;
  color: var(--sanguine-deep);
}
.instrument__error.visible { display: block; }

/* quiet mark — the borrowable line */
.instrument-mark {
  margin: 2.5rem 0 0;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-faint);
}
.instrument-mark a { color: var(--ink-soft); border-bottom: 1px dotted var(--ink-faint); }
.instrument-mark a:hover { color: var(--sanguine); }

@media (max-width: 40rem) {
  .instrument { padding: 1.25rem 1rem; }
}