:root {
  --paper: #fffefb;
  --paper-2: #f1f3ee;
  --ink: #203129;
  --muted: #66756e;
  --rule: #d8ded7;
  --accent: #2f6b4f;
  --accent-soft: #e7f0ea;
  --target: #a94f2a;
  --source: #496e87;
  --source-soft: #a9bfce;
  --success: #2f6b4f;
  --shadow: 0 10px 30px rgba(32, 49, 41, .07);
}

* { box-sizing: border-box; }

html, body { margin: 0; min-height: 100%; }

body {
  background: #f7f5ef;
  color: var(--ink);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  -webkit-font-smoothing: antialiased;
}

button, input { font: inherit; }

button, a, input { -webkit-tap-highlight-color: transparent; }

button:focus-visible, a:focus-visible, input:focus-visible, canvas:focus-visible {
  outline: 3px solid rgba(72, 106, 154, .5);
  outline-offset: 3px;
}

.demo-shell {
  width: min(100%, 1280px);
  height: 100svh;
  min-height: 620px;
  margin: 0 auto;
  padding: 16px 22px 10px;
  background:
    var(--paper);
  display: grid;
  grid-template-rows: auto auto minmax(0, 1fr) auto;
  gap: 10px;
  overflow: hidden;
}

.masthead {
  min-height: 52px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.eyebrow, .method-kicker {
  margin: 0 0 3px;
  color: var(--accent);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: .18em;
}

.masthead h1 {
  margin: 0;
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(25px, 2.35vw, 34px);
  line-height: 1;
  letter-spacing: -.025em;
}

.back-link {
  flex: none;
  color: var(--ink);
  font-size: 13px;
  font-weight: 750;
  text-decoration: none;
  border: 1px solid var(--rule);
  border-radius: 999px;
  padding: 9px 12px;
  background: rgba(255, 255, 255, .46);
  transition: border-color .18s ease, background .18s ease, transform .18s ease;
}

.back-link:hover { border-color: var(--accent); background: #fff; transform: translateY(-1px); }

kbd {
  padding: 1px 5px;
  border: 1px solid var(--rule);
  border-bottom-width: 2px;
  border-radius: 4px;
  background: #fff;
  color: var(--muted);
  font-family: inherit;
  font-size: .78em;
  font-weight: 700;
}

.method-tabs {
  display: flex;
  gap: 6px;
  padding-bottom: 7px;
  border-bottom: 1px solid var(--rule);
}

.method-tab {
  min-height: 35px;
  border: 0;
  border-radius: 6px;
  padding: 7px 14px;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  font-size: 13px;
  font-weight: 750;
  letter-spacing: .01em;
}

.method-tab span {
  margin-right: 6px;
  color: #8b9690;
  font-size: 10px;
  letter-spacing: .1em;
}

.method-tab:hover { background: var(--accent-soft); color: var(--ink); }
.method-tab.is-active { background: var(--ink); color: #fff; }
.method-tab.is-active span { color: #b9d3c3; }

.lab-grid {
  min-height: 0;
  display: grid;
  grid-template-columns: 306px minmax(0, 1fr);
  gap: 14px;
}

.control-rail, .stage-card {
  min-height: 0;
  border: 1px solid var(--rule);
  border-radius: 12px;
  background: rgba(255, 255, 255, .44);
  box-shadow: var(--shadow);
}

.control-rail {
  padding: 17px 18px 13px;
  display: flex;
  flex-direction: column;
  overflow: auto;
  scrollbar-width: thin;
}

.method-copy h2 {
  margin: 0 0 7px;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 21px;
  line-height: 1.08;
  letter-spacing: -.015em;
}

.method-copy > p:last-child {
  margin: 0;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.4;
}

.control-panel {
  margin-top: 14px;
  padding-top: 13px;
  border-top: 1px solid var(--rule);
}

.control-panel[hidden] { display: none; }

.range-label {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  color: var(--ink);
  font-size: 12px;
  font-weight: 750;
}

.range-label output {
  color: var(--accent);
  font-variant-numeric: tabular-nums;
}

input[type="range"] {
  width: 100%;
  height: 22px;
  margin: 3px 0 0;
  accent-color: var(--accent);
  cursor: pointer;
}

.microcopy {
  min-height: 34px;
  margin: 4px 0 9px;
  color: var(--muted);
  font-size: 11px;
  line-height: 1.4;
}

.button-row { display: flex; align-items: center; gap: 7px; }

.button, .icon-button {
  min-height: 34px;
  border: 1px solid var(--rule);
  border-radius: 6px;
  background: #fff;
  color: var(--ink);
  cursor: pointer;
  font-size: 11px;
  font-weight: 800;
  transition: border-color .15s ease, transform .15s ease, background .15s ease;
}

.button { flex: 1; padding: 7px 9px; }
.icon-button { width: 35px; padding: 0; font-size: 18px; line-height: 1; }
.button:hover, .icon-button:hover { border-color: var(--accent); transform: translateY(-1px); }
.button.primary { border-color: var(--accent); background: var(--accent); color: #fff; }
.button[aria-pressed="true"] { border-color: var(--source); background: var(--source); color: #fff; }
.button:disabled { opacity: .46; cursor: default; transform: none; }

.check-label {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  margin-top: 9px;
  color: var(--muted);
  font-size: 11px;
  cursor: pointer;
}

.check-label input { accent-color: var(--source); }

.metrics {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  margin: auto 0 10px;
  padding-top: 13px;
}

.metrics > div {
  min-width: 0;
  padding: 8px 9px;
  background: var(--paper-2);
}

.metrics > div:first-child { border-radius: 7px 0 0 0; }
.metrics > div:nth-child(2) { border-radius: 0 7px 0 0; }
.metrics > div:last-child { grid-column: 1 / -1; border-radius: 0 0 7px 7px; }
.metrics dt { color: var(--muted); font-size: 9px; font-weight: 750; letter-spacing: .08em; text-transform: uppercase; }
.metrics dd { margin: 2px 0 0; color: var(--accent); font-size: 17px; font-weight: 700; font-variant-numeric: tabular-nums; }
.metrics > div:last-child dd { font-size: 14px; }
.metrics dd { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

.legend {
  display: flex;
  gap: 14px;
  color: var(--muted);
  font-size: 10px;
  font-weight: 650;
}

.legend span { display: inline-flex; align-items: center; gap: 5px; }
.dot { width: 7px; height: 7px; border-radius: 50%; }
.target-dot { background: var(--target); }
.source-dot { background: var(--source); }

.stage-card {
  position: relative;
  padding: 11px 12px 8px;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.stage-bar {
  min-height: 31px;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
}

.stage-bar h2 {
  margin: 2px 0 0;
  color: var(--muted);
  font-size: 10px;
  font-weight: 850;
  letter-spacing: .13em;
}

.status {
  max-width: 58%;
  margin: 0;
  overflow: hidden;
  color: var(--muted);
  font-size: 10px;
  font-weight: 650;
  text-align: right;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.status i {
  display: inline-block;
  width: 7px;
  height: 7px;
  margin-right: 5px;
  border-radius: 50%;
  background: var(--success);
}

.status.is-running i { animation: pulse 1s ease-in-out infinite; }

@keyframes pulse { 50% { opacity: .28; transform: scale(.72); } }

#registration-canvas {
  display: block;
  width: 100%;
  flex: 1 1 auto;
  min-height: 0;
  border-radius: 8px;
  background: #fbfaf6;
  cursor: crosshair;
  touch-action: none;
}

body.mode-icp #registration-canvas { cursor: grab; }
body.mode-icp #registration-canvas.is-dragging { cursor: grabbing; }

.canvas-hint {
  min-height: 16px;
  margin: 6px 2px 0;
  color: var(--muted);
  font-size: 10.5px;
}

footer {
  min-height: 17px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--muted);
  font-size: 9px;
  letter-spacing: .02em;
}

footer p { margin: 0; }

.truth-swatch {
  display: inline-block;
  width: 17px;
  margin-right: 5px;
  border-top: 1px dashed #7d8781;
  vertical-align: middle;
}

.fallback {
  width: min(920px, calc(100% - 36px));
  margin: 8vh auto;
  padding: 48px;
  border: 1px solid var(--rule);
  border-radius: 12px;
  background: var(--paper);
  box-shadow: var(--shadow);
}

.fallback h1 { margin-top: 0; font: 700 48px/1.05 Georgia, serif; }
.fallback > p { color: var(--muted); line-height: 1.6; }
.fallback-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin: 32px 0; }
.fallback-grid section { padding: 20px; border-radius: 8px; background: var(--paper-2); }
.fallback-grid h2 { margin: 0 0 8px; font: 700 22px Georgia, serif; }
.fallback-grid p { margin: 0; color: var(--muted); font-size: 14px; line-height: 1.5; }

@media (max-width: 800px) {
  .demo-shell { height: auto; min-height: 100svh; overflow: visible; padding: 14px; }
  .masthead h1 { font-size: 25px; }
  .back-link kbd { display: none; }
  .method-tabs { overflow-x: auto; }
  .method-tab { flex: 1 0 auto; }
  .lab-grid { grid-template-columns: 1fr; }
  .control-rail { overflow: visible; }
  .metrics { margin-top: 14px; }
  .stage-card { min-height: 490px; }
  #registration-canvas { min-height: 390px; }
}

@media (max-width: 520px) {
  .masthead { align-items: flex-start; }
  .masthead .eyebrow { max-width: 210px; }
  .masthead h1 { font-size: 21px; }
  .back-link { padding: 8px; font-size: 11px; }
  .method-tab { padding-inline: 10px; }
  .stage-bar { align-items: flex-start; }
  .status { max-width: 55%; }
  .stage-card { min-height: 420px; }
  #registration-canvas { min-height: 330px; }
  footer { align-items: flex-start; gap: 12px; }
  footer p:last-child { text-align: right; }
  .fallback { padding: 28px; }
  .fallback-grid { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
}