:root {
  --bg: #f7f1e7;
  --paper: #fffaf2;
  --paper-strong: #fff5e6;
  --ink: #241f18;
  --muted: #6f6659;
  --line: #ded0b9;
  --accent: #73461f;
  --accent-dark: #4e2e11;
  --accent-soft: #ead5b5;
  --green: #276749;
  --green-bg: #dff1e8;
  --green-soft: #edf8f2;
  --red: #8b2f25;
  --red-bg: #f2ddd8;
  --gold: #8a6400;
  --gold-bg: #f7e9b8;
  --shadow: 0 1.4rem 3rem rgba(45, 32, 18, 0.08);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background:
    radial-gradient(circle at top left, rgba(115, 70, 31, 0.16), transparent 34rem),
    linear-gradient(180deg, #fbf5ea 0%, var(--bg) 52%, #efe4d3 100%);
  color: var(--ink);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.5;
}

.hero {
  max-width: 1240px;
  margin: 0 auto;
  padding: 4rem 1.25rem 2rem;
}

.eyebrow {
  margin: 0 0 0.45rem;
  color: var(--accent);
  font-size: 0.76rem;
  font-weight: 800;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

h1, h2, h3 {
  margin: 0;
  line-height: 1.12;
}

h1 {
  max-width: 900px;
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(2.7rem, 6vw, 5.7rem);
  font-weight: 700;
  letter-spacing: -0.055em;
}

h2 {
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.45rem;
}

h3 {
  margin-bottom: 0.6rem;
  color: var(--muted);
  font-size: 0.86rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.lede {
  max-width: 760px;
  margin: 1.1rem 0 0;
  color: var(--muted);
  font-size: 1.15rem;
}

.app-shell {
  display: grid;
  grid-template-columns: minmax(290px, 0.62fr) minmax(650px, 1.8fr);
  gap: 1.25rem;
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 1.25rem 4rem;
}

.panel {
  background: rgba(255, 250, 242, 0.94);
  border: 1px solid var(--line);
  border-radius: 1.25rem;
  box-shadow: var(--shadow);
  padding: 1.45rem;
}

.controls-panel {
  align-self: start;
}

.grid-panel { overflow: hidden; }

.result-panel, .notes-panel {
  grid-column: 1 / -1;
}

.panel-heading, .section-heading {
  display: flex;
  justify-content: space-between;
  align-items: start;
  gap: 1rem;
  margin-bottom: 1.15rem;
}

label {
  display: block;
  margin-bottom: 0.45rem;
  font-weight: 800;
}

input[type="text"] {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 0.8rem;
  padding: 0.85rem 1rem;
  background: #fff;
  color: var(--ink);
  font-size: 1rem;
}

input[type="text"]:focus {
  outline: 3px solid var(--accent-soft);
  border-color: var(--accent);
}

.control-group { margin-top: 1.25rem; }


.control-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.9rem;
}

.segmented {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.segmented.vertical {
  display: grid;
  grid-template-columns: 1fr;
}

button {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.65rem 0.82rem;
  background: #fffaf2;
  color: var(--ink);
  cursor: pointer;
  font-weight: 800;
}

button.active, button:hover {
  border-color: var(--accent);
  background: var(--accent);
  color: white;
}

button.secondary {
  background: var(--accent-soft);
  color: var(--accent-dark);
}

button.secondary:hover { color: white; }

.advanced {
  margin-top: 1.35rem;
  border-top: 1px solid var(--line);
  padding-top: 1rem;
}

summary {
  cursor: pointer;
  color: var(--accent-dark);
  font-weight: 800;
}

code {
  display: inline-block;
  margin-top: 0.45rem;
  border-radius: 0.5rem;
  background: #f0e6d7;
  padding: 0.25rem 0.45rem;
  color: var(--accent-dark);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  word-break: break-word;
}

.badge {
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent-dark);
  padding: 0.35rem 0.7rem;
  font-size: 0.8rem;
  font-weight: 800;
  white-space: nowrap;
}

.helper {
  margin: -0.25rem 0 1rem;
  color: var(--muted);
}

.table-wrap {
  overflow-x: auto;
  padding-bottom: 0.5rem;
}

.paradigm {
  width: 100%;
  min-width: 900px;
  border-collapse: separate;
  border-spacing: 0.38rem;
}

.paradigm th,
.paradigm td {
  border-radius: 0.75rem;
  padding: 0.82rem 0.72rem;
  text-align: center;
  white-space: nowrap;
}

.paradigm thead th,
.paradigm tbody th {
  background: #f0e4d3;
  color: var(--accent-dark);
  font-weight: 900;
}

.paradigm .corner { text-align: left; }

.paradigm td {
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink);
  cursor: pointer;
  font-size: 0.92rem;
  font-weight: 750;
  transition: transform 120ms ease, box-shadow 120ms ease, background 120ms ease;
}

.paradigm td:not(.blocked):not(.question):hover,
.paradigm td.selected {
  background: var(--green-bg);
  border-color: var(--green);
  color: var(--green);
  box-shadow: 0 0.75rem 1.5rem rgba(39, 103, 73, 0.12);
  transform: translateY(-2px);
}

.paradigm tr:hover > th {
  background: var(--accent-soft);
  color: var(--accent-dark);
}

.paradigm tr.selected-row > th,
.paradigm thead th.selected-column {
  background: var(--accent-soft);
  color: var(--accent-dark);
  box-shadow: inset 0 0 0 2px var(--accent);
}

.reflexive {
  background: #e7e1f2 !important;
  border-color: #b7a8cf !important;
  color: #564578 !important;
  cursor: pointer !important;
}

.paradigm td.reflexive:hover,
.paradigm td.reflexive.selected {
  background: #dcd1eb !important;
  border-color: #765f99 !important;
  color: #473566 !important;
  box-shadow: 0 0.75rem 1.5rem rgba(86, 69, 120, 0.14);
  transform: translateY(-2px);
}



.payload-card {
  grid-column: 1 / -1;
}

#payload-preview {
  margin: 0.45rem 0 0;
  padding: 0.75rem;
  border-radius: 0.75rem;
  background: #f0e6d7;
  color: var(--accent-dark);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.85rem;
  white-space: pre-wrap;
  overflow-x: auto;
}

.blocked {
  background: var(--red-bg) !important;
  border-color: transparent !important;
  color: var(--red) !important;
  cursor: not-allowed !important;
}

.question {
  background: var(--gold-bg) !important;
  border-color: transparent !important;
  color: var(--gold) !important;
  cursor: not-allowed !important;
}

.legend {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  margin-top: 0.85rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.result-panel h2 {
  max-width: 960px;
  margin-bottom: 1.25rem;
  font-size: 1.65rem;
}

.derivation-flow {
  display: grid;
  grid-template-columns: minmax(180px, 1fr) auto minmax(260px, 1.35fr) auto minmax(220px, 1fr);
  gap: 0.9rem;
  align-items: stretch;
}

.flow-card {
  border: 1px solid var(--line);
  border-radius: 1rem;
  background: var(--paper-strong);
  padding: 1rem;
}

.surface-card {
  background: var(--green-soft);
  border-color: #cfe9dc;
}

.flow-arrow {
  align-self: center;
  color: var(--accent);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.7rem;
  font-weight: 900;
}

.label {
  display: block;
  margin-bottom: 0.35rem;
  color: var(--muted);
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.surface-form {
  color: var(--green);
  font-size: 1.2rem;
}

.actions {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-top: 1.25rem;
}

.notes-panel ul {
  margin: 0.75rem 0 0;
  padding-left: 1.25rem;
  color: var(--muted);
}

.toggle-control {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  font-size: 0.82rem;
  font-weight: 800;
  color: var(--muted);
  white-space: nowrap;
  justify-content: space-between;
  max-width: 100%;
}

.toggle-stack {
  display: grid;
  gap: 0.65rem;
}

.switch {
  position: relative;
  display: inline-block;
  width: 2.9rem;
  height: 1.55rem;
  flex: 0 0 auto;
  margin: 0;
}

.switch input {
  opacity: 0;
  width: 0;
  height: 0;
  position: absolute;
}

.switch:has(input:disabled) {
  cursor: not-allowed;
  opacity: 0.45;
}

.switch input:disabled + .slider {
  cursor: not-allowed;
  background: #ddd4c7;
  border-color: var(--line);
}

.toggle-control:has(input:disabled) {
  color: #9a9185;
}

.slider {
  position: absolute;
  cursor: pointer;
  inset: 0;
  background: var(--accent-soft);
  border: 1px solid var(--line);
  border-radius: 999px;
  transition: 140ms ease;
}

.slider::before {
  content: "";
  position: absolute;
  height: 1.05rem;
  width: 1.05rem;
  left: 0.18rem;
  top: 0.18rem;
  background: white;
  border-radius: 50%;
  box-shadow: 0 0.18rem 0.4rem rgba(45, 32, 18, 0.18);
  transition: 140ms ease;
}

.switch input:checked + .slider {
  background: var(--accent);
  border-color: var(--accent);
}

.switch input:checked + .slider::before {
  transform: translateX(1.3rem);
}

@media (max-width: 1020px) {
  .app-shell { grid-template-columns: 1fr; }
  .derivation-flow {
    grid-template-columns: 1fr;
  }
  .flow-arrow {
    text-align: center;
  }
}



@media (max-width: 620px) {
  .hero { padding-top: 2.4rem; }
  .control-grid { grid-template-columns: 1fr; }
}