:root {
  --tool-ink: #181915;
  --tool-muted: #686a62;
  --tool-faint: #8a8c84;
  --tool-rule: #cbc7bc;
  --tool-paper: #f3f0e8;
  --tool-panel: #faf8f2;
  --tool-panel-deep: #e9e4d9;
  --tool-accent: #963e2d;
  --tool-accent-pale: #ead9d2;
  --tool-green: #345e4b;
  --tool-green-pale: #dce8df;
  --tool-amber: #8a5a13;
  --tool-amber-pale: #eee2c8;
  --tool-red: #8d3028;
  --tool-red-pale: #ecd8d3;
  --tool-dark: #20211e;
  --tool-dark-rule: #45463f;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
}

.instrument-page {
  background: var(--tool-paper);
}

.tool-wrap {
  width: min(calc(100% - 48px), 1320px);
  margin: 0 auto;
}

.visually-hidden {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

.instrument-hero {
  padding: clamp(68px, 9vw, 118px) 0 62px;
  border-bottom: 1px solid var(--tool-rule);
}

.instrument-hero h1 {
  max-width: 1040px;
  margin: 0;
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(3.55rem, 8.1vw, 7.9rem);
  font-weight: 500;
  line-height: .88;
  letter-spacing: -.058em;
}

.instrument-question {
  max-width: 920px;
  margin: 40px 0 0;
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(1.55rem, 3.2vw, 2.8rem);
  line-height: 1.12;
  letter-spacing: -.025em;
}

.instrument-intro {
  max-width: 790px;
  margin: 24px 0 0;
  color: #454740;
  font-size: 1.08rem;
}

.locality-note {
  display: flex;
  width: fit-content;
  max-width: 720px;
  align-items: center;
  gap: 14px;
  margin-top: 34px;
  padding: 13px 17px 13px 14px;
  border: 1px solid #b8b5aa;
  background: rgba(250, 248, 242, .68);
  font-size: .88rem;
}

.locality-note div {
  display: flex;
  flex-wrap: wrap;
  gap: 3px 8px;
}

.locality-note span:not(.locality-mark) { color: var(--tool-muted); }

.locality-mark {
  width: 9px;
  height: 9px;
  flex: 0 0 9px;
  border: 2px solid var(--tool-green);
  border-radius: 50%;
  box-shadow: 0 0 0 3px var(--tool-green-pale);
}

.instrument-shell {
  padding: 40px 0 68px;
  border-bottom: 1px solid var(--tool-rule);
}

.mode-switch {
  display: grid;
  grid-template-columns: 1fr 1fr;
  max-width: 750px;
  margin-bottom: 30px;
  border: 1px solid var(--tool-ink);
}

button,
input,
textarea {
  font: inherit;
}

button { color: inherit; }

button:focus-visible,
input:focus-visible,
textarea:focus-visible,
a:focus-visible,
pre:focus-visible {
  outline: 3px solid rgba(150, 62, 45, .33);
  outline-offset: 3px;
}

.mode-button {
  display: flex;
  align-items: center;
  gap: 12px;
  min-height: 54px;
  padding: 10px 18px;
  border: 0;
  background: transparent;
  color: var(--tool-muted);
  cursor: pointer;
  font-size: .9rem;
  font-weight: 700;
  text-align: left;
}

.mode-button + .mode-button { border-left: 1px solid var(--tool-ink); }

.mode-button.is-active {
  background: var(--tool-ink);
  color: #f7f4ed;
}

.mode-number {
  color: var(--tool-accent);
  font-family: Georgia, "Times New Roman", serif;
  font-size: .76rem;
  font-style: italic;
}

.mode-button.is-active .mode-number { color: #d9a394; }

.recorded-controls {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 26px;
  margin: 0 0 24px;
  padding: 24px 26px;
  border: 1px solid var(--tool-rule);
  background: var(--tool-panel-deep);
}

.recorded-controls[hidden] { display: none; }
.recorded-controls p { margin: 5px 0 0; }

.observation-switch {
  display: inline-flex;
  flex: 0 0 auto;
  border: 1px solid var(--tool-ink);
}

.observation-button {
  min-height: 42px;
  padding: 8px 14px;
  border: 0;
  background: var(--tool-panel);
  cursor: pointer;
  font-size: .79rem;
  font-weight: 700;
}

.observation-button + .observation-button { border-left: 1px solid var(--tool-ink); }
.observation-button span { margin-right: 4px; font-family: Georgia, "Times New Roman", serif; font-size: 1rem; }
.observation-button.is-active { background: var(--tool-ink); color: #fffdf6; }

.workspace-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(390px, .92fr);
  border: 1px solid var(--tool-ink);
  background: var(--tool-panel);
}

.capture-panel,
.verdict-panel {
  min-width: 0;
  padding: clamp(24px, 3vw, 38px);
}

.verdict-panel {
  border-left: 1px solid var(--tool-ink);
  background: #f0ece2;
}

.panel-head,
.machine-head {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 18px;
  padding-bottom: 21px;
  border-bottom: 1px solid var(--tool-rule);
}

.panel-head h2,
.machine-head h2 {
  margin: 3px 0 0;
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(1.75rem, 3vw, 2.4rem);
  font-weight: 500;
  letter-spacing: -.025em;
}

.panel-kicker {
  margin: 0;
  color: var(--tool-accent);
  font-size: .68rem;
  font-weight: 780;
  letter-spacing: .15em;
  text-transform: uppercase;
}

.micro-chip,
.verdict-chip {
  display: inline-flex;
  width: fit-content;
  flex: 0 0 auto;
  align-items: center;
  min-height: 27px;
  padding: 4px 8px;
  border: 1px solid var(--tool-rule);
  color: var(--tool-muted);
  background: rgba(255,255,255,.32);
  font-family: var(--mono);
  font-size: .66rem;
  letter-spacing: .025em;
  text-transform: uppercase;
}

.verdict-chip.is-invalid,
.verdict-chip.is-present { border-color: #bf847a; color: var(--tool-red); background: var(--tool-red-pale); }
.verdict-chip.is-unknown { border-color: #c1a26e; color: var(--tool-amber); background: var(--tool-amber-pale); }
.verdict-chip.is-warranted { border-color: #87a492; color: var(--tool-green); background: var(--tool-green-pale); }

.form-section {
  min-width: 0;
  margin: 0;
  padding: 28px 0;
  border: 0;
  border-bottom: 1px solid var(--tool-rule);
}

.form-section legend {
  display: flex;
  width: 100%;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  margin: 0 0 17px;
  padding: 0;
}

.form-section legend span {
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.15rem;
  font-weight: 700;
}

.form-section legend small,
.field small,
.field-help {
  color: var(--tool-faint);
  font-size: .68rem;
  font-weight: 500;
}

.field-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 15px;
}

.field-wide { grid-column: 1 / -1; }

.field {
  display: grid;
  min-width: 0;
  gap: 6px;
  color: #50524b;
  font-size: .69rem;
  font-weight: 760;
  letter-spacing: .06em;
  text-transform: uppercase;
}

.field > span {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 5px 10px;
}

.field input,
.field textarea {
  width: 100%;
  min-width: 0;
  border: 1px solid #bdb9ad;
  border-radius: 0;
  color: var(--tool-ink);
  background: #fffef9;
  font-family: var(--mono);
  font-size: .76rem;
  font-weight: 400;
  letter-spacing: 0;
  text-transform: none;
}

.field input { min-height: 42px; padding: 9px 11px; }
.field textarea { min-height: 120px; padding: 12px; line-height: 1.55; resize: vertical; }
.field input::placeholder,
.field textarea::placeholder { color: #989a92; opacity: 1; }

.field input[readonly],
.field textarea[readonly] {
  border-color: #d1cdc1;
  background: #efebe1;
  color: #50514c;
}

.field-help {
  margin-top: -1px;
  letter-spacing: 0;
  line-height: 1.35;
  text-transform: none;
}

.form-actions,
.button-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 12px;
  padding-top: 24px;
}

.primary-button,
.secondary-button,
.text-button {
  min-height: 42px;
  border-radius: 0;
  cursor: pointer;
  font-size: .78rem;
  font-weight: 780;
}

.primary-button {
  padding: 10px 17px;
  border: 1px solid var(--tool-ink);
  background: var(--tool-ink);
  color: #fffdf7;
}

.primary-button:hover { background: var(--tool-accent); border-color: var(--tool-accent); }

.secondary-button {
  padding: 9px 13px;
  border: 1px solid #8e9088;
  background: transparent;
}

.secondary-button:hover { border-color: var(--tool-ink); background: rgba(255,255,255,.4); }

.text-button {
  padding: 9px 5px;
  border: 0;
  background: transparent;
  color: var(--tool-muted);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: .2em;
}

.text-button:hover { color: var(--tool-accent); }
button:disabled { cursor: not-allowed; opacity: .45; }

.memory-note {
  margin: 13px 0 0;
  color: var(--tool-faint);
  font-size: .72rem;
}

.verdict-summary {
  min-height: 155px;
  padding: 28px 0 26px;
  border-bottom: 1px solid var(--tool-rule);
}

.verdict-summary p { max-width: 530px; margin: 8px 0 0; color: var(--tool-muted); }

.verdict-summary .verdict-display {
  margin: 0;
  color: var(--tool-ink);
  font-family: var(--mono);
  font-size: clamp(1.6rem, 3.3vw, 2.75rem);
  font-weight: 780;
  line-height: 1.08;
  letter-spacing: -.045em;
}

.verdict-summary.is-invalid .verdict-display,
.verdict-summary.is-present .verdict-display { color: var(--tool-red); }
.verdict-summary.is-unknown .verdict-display { color: var(--tool-amber); }
.verdict-summary.is-warranted .verdict-display { color: var(--tool-green); }

.trust-note {
  margin: 22px 0 0;
  padding: 17px 18px;
  border-left: 3px solid var(--tool-accent);
  background: rgba(255,255,255,.46);
}

.trust-note span {
  color: var(--tool-accent);
  font-size: .65rem;
  font-weight: 780;
  letter-spacing: .13em;
  text-transform: uppercase;
}

.trust-note p { margin: 5px 0 0; color: #575950; font-size: .78rem; }

.diagnostic-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  margin-top: 28px;
}

.diagnostic-head h3 {
  margin: 0;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.2rem;
}

.diagnostic-head span { color: var(--tool-faint); font-size: .68rem; }
.diagnostics { margin-top: 13px; }
.empty-state { color: var(--tool-faint); font-size: .82rem; }

.diagnostic-group + .diagnostic-group { margin-top: 18px; }
.diagnostic-group h4 {
  margin: 0 0 6px;
  color: var(--tool-faint);
  font-size: .61rem;
  letter-spacing: .13em;
  text-transform: uppercase;
}

.diagnostic-row {
  display: grid;
  grid-template-columns: 20px minmax(0, 1fr);
  gap: 9px;
  padding: 9px 0;
  border-top: 1px solid #d6d2c7;
}

.diagnostic-symbol {
  display: grid;
  width: 18px;
  height: 18px;
  place-items: center;
  margin-top: 1px;
  border: 1px solid currentColor;
  border-radius: 50%;
  color: var(--tool-faint);
  font-family: var(--mono);
  font-size: .64rem;
  font-weight: 800;
}

.diagnostic-row.is-satisfied .diagnostic-symbol { color: var(--tool-green); }
.diagnostic-row.is-blocked .diagnostic-symbol { color: var(--tool-red); }
.diagnostic-row.is-unknown .diagnostic-symbol { color: var(--tool-amber); }

.diagnostic-row strong { display: block; font-size: .76rem; }
.diagnostic-row p { margin: 2px 0 0; color: var(--tool-muted); font-size: .68rem; line-height: 1.4; }

.result-section,
.receiver-section,
.premise-section,
.method-section {
  padding: clamp(58px, 8vw, 92px) 0;
  border-bottom: 1px solid var(--tool-rule);
}

.result-grid {
  display: grid;
  grid-template-columns: minmax(0, .82fr) minmax(480px, 1.18fr);
  gap: clamp(46px, 7vw, 96px);
}

.result-copy { min-width: 0; }

.result-copy h2,
.premise-layout h2,
.method-grid h2 {
  margin: 8px 0 22px;
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(2.4rem, 5vw, 5rem);
  font-weight: 500;
  line-height: .96;
  letter-spacing: -.042em;
}

.proposition-sentence {
  margin: 0;
  padding: 24px 0;
  border-top: 1px solid var(--tool-ink);
  border-bottom: 1px solid var(--tool-ink);
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(1.18rem, 2.1vw, 1.65rem);
  line-height: 1.42;
  overflow-wrap: anywhere;
}

.result-copy h3 { margin: 31px 0 10px; font-size: .72rem; letter-spacing: .12em; text-transform: uppercase; }
.boundary-list { margin: 0; padding: 0; list-style: none; }
.boundary-list li { position: relative; padding: 8px 0 8px 21px; border-top: 1px solid var(--tool-rule); color: var(--tool-muted); font-size: .84rem; }
.boundary-list li::before { content: "—"; position: absolute; left: 0; color: var(--tool-accent); }

.machine-output {
  min-width: 0;
  padding: clamp(24px, 3vw, 34px);
  background: var(--tool-dark);
  color: #f5f1e8;
}

.machine-output .panel-kicker { color: #d69b8d; }
.machine-output .machine-head { border-color: var(--tool-dark-rule); }
.machine-output .micro-chip { border-color: #5e6058; color: #b8bbb1; background: transparent; }
.machine-note {
  margin: 19px 0 0;
  color: #b9bbb3;
  font-size: .74rem;
}

.machine-output > pre {
  overflow: auto;
  min-height: 360px;
  max-height: 590px;
  margin: 0;
  padding: 24px 0;
  border-bottom: 1px solid var(--tool-dark-rule);
  color: #e8e5dc;
  font-family: var(--mono);
  font-size: .72rem;
  line-height: 1.65;
  white-space: pre;
}

.machine-output .secondary-button { border-color: #767870; color: #f0ede4; }
.machine-output .secondary-button:hover { border-color: #d8d5cc; background: #2b2c28; }
.machine-output .text-button { color: #b9bbb3; }
.action-status { min-height: 1.3em; margin: 10px 0 0; color: #c9cbc2; font-size: .7rem; }

.canonical-component {
  margin-top: 22px;
  border-top: 1px solid var(--tool-dark-rule);
}

.canonical-component summary {
  padding: 16px 0;
  color: #c9cbc2;
  cursor: pointer;
  font-size: .72rem;
  font-weight: 700;
}

.canonical-component pre {
  overflow: auto;
  max-height: 420px;
  margin: 0;
  padding: 0 0 18px;
  color: #e8e5dc;
  font-family: var(--mono);
  font-size: .68rem;
  line-height: 1.6;
  white-space: pre;
}

.receiver-section { background: var(--tool-paper); }
.receiver-layout {
  display: grid;
  grid-template-columns: minmax(280px, .64fr) minmax(500px, 1fr);
  gap: 30px clamp(46px, 7vw, 90px);
}

.receiver-layout h2 {
  margin: 8px 0 22px;
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(2.4rem, 5vw, 5rem);
  font-weight: 500;
  line-height: .96;
  letter-spacing: -.042em;
}

.evidence-flow {
  margin: 30px 0 0;
  padding: 0;
  list-style: none;
  counter-reset: flow;
}

.evidence-flow li {
  position: relative;
  padding: 10px 12px 10px 34px;
  border-top: 1px solid var(--tool-rule);
  color: var(--tool-muted);
  font-family: var(--mono);
  font-size: .72rem;
  counter-increment: flow;
}

.evidence-flow li::before {
  position: absolute;
  left: 2px;
  color: var(--tool-accent);
  content: "0" counter(flow);
}

.evidence-flow li + li::after {
  position: absolute;
  top: -8px;
  left: 10px;
  color: var(--tool-faint);
  content: "↓";
}

.import-form {
  padding: 27px;
  border: 1px solid var(--tool-ink);
  background: var(--tool-panel);
}

.import-form > .field textarea { min-height: 250px; }
.import-context { margin-top: 18px; }

.package-result {
  grid-column: 2;
  display: grid;
  grid-template-columns: auto auto minmax(0, 1fr);
  align-items: baseline;
  gap: 5px 12px;
  padding: 15px 17px;
  border: 1px solid #bcb8ad;
  color: var(--tool-muted);
  background: rgba(255,255,255,.3);
  font-size: .8rem;
}

.result-label {
  color: var(--tool-faint);
  font-size: .62rem;
  font-weight: 780;
  letter-spacing: .12em;
  text-transform: uppercase;
}

.package-result strong { color: var(--tool-ink); }
.package-result.is-valid { border-color: #799783; background: var(--tool-green-pale); }
.package-result.is-valid strong { color: var(--tool-green); }
.package-result.is-block { border-color: #bb8178; background: var(--tool-red-pale); }
.package-result.is-block strong { color: var(--tool-red); }

.premise-section { background: var(--tool-panel-deep); }
.premise-layout {
  display: grid;
  grid-template-columns: minmax(270px, .62fr) minmax(460px, 1fr);
  gap: 30px clamp(46px, 7vw, 90px);
}

.section-intro { max-width: 520px; color: var(--tool-muted); }
.premise-form { padding: 27px; border: 1px solid var(--tool-ink); background: var(--tool-panel); }
.premise-form .primary-button { margin-top: 20px; }

.premise-result {
  grid-column: 2;
  display: flex;
  flex-wrap: wrap;
  gap: 5px 10px;
  padding: 15px 17px;
  border: 1px solid #bcb8ad;
  color: var(--tool-muted);
  background: rgba(255,255,255,.3);
  font-size: .8rem;
}

.premise-result strong { color: var(--tool-ink); }
.premise-result.is-match { border-color: #799783; background: var(--tool-green-pale); }
.premise-result.is-match strong { color: var(--tool-green); }
.premise-result.is-block { border-color: #bb8178; background: var(--tool-red-pale); }
.premise-result.is-block strong { color: var(--tool-red); }
.premise-differences { width: 100%; margin: 7px 0 0; padding: 8px 0 0 18px; border-top: 1px solid currentColor; font-family: var(--mono); font-size: .7rem; }

.method-grid {
  display: grid;
  grid-template-columns: minmax(320px, .8fr) minmax(430px, 1.2fr);
  gap: clamp(45px, 8vw, 110px);
}

.method-copy { max-width: 700px; }
.method-copy p { margin: 0 0 20px; color: #484a43; font-size: 1rem; }
.reference-links { display: flex; flex-wrap: wrap; gap: 8px 20px; padding-top: 20px; border-top: 1px solid var(--tool-rule); font-size: .79rem; font-weight: 700; }
.noscript-note { margin: 30px auto; padding: 18px; border: 1px solid var(--tool-red); background: var(--tool-red-pale); }
.instrument-page code { font-family: var(--mono); }

@media (max-width: 1040px) {
  .workspace-grid,
  .result-grid {
    grid-template-columns: 1fr;
  }
  .verdict-panel { border-top: 1px solid var(--tool-ink); border-left: 0; }
  .is-recorded-mode .verdict-panel {
    order: -1;
    border-top: 0;
    border-bottom: 1px solid var(--tool-ink);
  }
  .result-grid { gap: 42px; }
  .machine-output pre { min-height: 310px; }
}

@media (max-width: 780px) {
  .tool-wrap { width: min(calc(100% - 30px), 1320px); }
  .instrument-hero { padding-top: 64px; }
  .instrument-hero h1 { font-size: clamp(3rem, 15vw, 5.2rem); }
  .instrument-question { margin-top: 30px; }
  .mode-switch { grid-template-columns: 1fr; }
  .mode-button + .mode-button { border-top: 1px solid var(--tool-ink); border-left: 0; }
  .recorded-controls { align-items: stretch; flex-direction: column; }
  .observation-switch { width: 100%; }
  .observation-button { flex: 1; }
  .premise-layout,
  .receiver-layout,
  .method-grid { grid-template-columns: 1fr; }
  .package-result,
  .premise-result { grid-column: 1; }
  .result-copy h2,
  .receiver-layout h2,
  .premise-layout h2,
  .method-grid h2 { font-size: clamp(2.45rem, 12vw, 4.2rem); }
}

@media (max-width: 560px) {
  .instrument-page .site-header { padding: 20px 0 16px; }
  .instrument-page .nav { gap: 11px; font-size: .78rem; }
  .instrument-hero { padding-bottom: 46px; }
  .instrument-hero h1 { letter-spacing: -.05em; }
  .locality-note { align-items: flex-start; }
  .workspace-grid { border-right: 0; border-left: 0; }
  .capture-panel,
  .verdict-panel { padding: 24px 15px; }
  .field-grid { grid-template-columns: 1fr; }
  .field-wide { grid-column: 1; }
  .form-section legend { align-items: flex-start; flex-direction: column; gap: 1px; }
  .form-actions .primary-button { width: 100%; }
  .panel-head { align-items: flex-start; flex-direction: column; }
  .result-section,
  .receiver-section,
  .premise-section,
  .method-section { padding: 58px 0; }
  .machine-output { margin: 0 -15px; padding: 24px 15px; }
  .machine-output pre { font-size: .66rem; }
  .import-form { padding: 20px 15px; }
  .package-result { grid-template-columns: 1fr; }
  .premise-form { padding: 20px 15px; }
  .premise-form .primary-button { width: 100%; }
  .button-row { align-items: stretch; flex-direction: column; }
  .button-row button { width: 100%; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}