/* Signal Lab Week 1 — app-shell only. Tokens from cx-tokens.css. No invented hex. */
[data-cx-variant="app-shell"] body.signal-lab {
  margin: 0;
  min-height: 100dvh;
  font-family: var(--cx-font-sans);
  background: var(--cx-bg);
  color: var(--cx-text);
  line-height: var(--cx-leading);
  padding-bottom: 6.5rem;
}

.signal-lab .sl-wrap {
  max-width: 42rem;
  margin: 0 auto;
  padding: var(--cx-space-4);
}

.signal-lab header.sl-top {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--cx-space-3);
  margin-bottom: var(--cx-space-4);
}

.signal-lab header.sl-top h1 {
  font-size: var(--cx-text-lg);
  margin: 0;
  flex: 1 1 auto;
}

.signal-lab .sl-panel {
  background: var(--cx-panel);
  border: 1px solid var(--cx-border);
  border-radius: var(--cx-radius);
  box-shadow: var(--cx-shadow);
  padding: var(--cx-space-5);
  margin-bottom: var(--cx-space-4);
}

.signal-lab .sl-panel h2 {
  margin: 0 0 var(--cx-space-3);
  font-size: var(--cx-text-lg);
  color: var(--cx-accent);
}

.signal-lab .sl-muted { color: var(--cx-muted); font-size: var(--cx-text-sm); }
.signal-lab .sl-lead { margin: 0 0 var(--cx-space-3); }

.signal-lab .sl-checklist {
  list-style: none;
  padding: 0;
  margin: 0;
}
.signal-lab .sl-checklist li {
  display: flex;
  gap: var(--cx-space-3);
  align-items: flex-start;
  padding: var(--cx-space-2) 0;
  border-bottom: 1px solid var(--cx-border);
  min-height: var(--cx-touch);
}
.signal-lab .sl-checklist label {
  flex: 1;
  cursor: pointer;
}
.signal-lab .sl-checklist input {
  width: 1.25rem;
  height: 1.25rem;
  margin-top: 0.2rem;
  accent-color: var(--cx-accent);
}

.signal-lab .sl-btn,
.signal-lab a.sl-btn {
  appearance: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  box-sizing: border-box;
  border: 1px solid var(--cx-border-strong);
  background: var(--cx-accent);
  color: var(--cx-bg);
  font-weight: 700;
  font-size: var(--cx-text-base);
  line-height: 1;
  min-height: var(--cx-touch);
  min-width: var(--cx-touch);
  height: var(--cx-touch);
  padding: 0 1rem;
  border-radius: 999px;
  cursor: pointer;
  text-decoration: none;
  vertical-align: middle;
  transition: background var(--cx-motion) var(--cx-ease);
}
.signal-lab .sl-btn::-moz-focus-inner,
.signal-lab a.sl-btn::-moz-focus-inner {
  border: 0;
  padding: 0;
}
.signal-lab .sl-btn:hover { background: var(--cx-accent-hover); }
.signal-lab .sl-btn:focus-visible { outline: none; box-shadow: var(--cx-focus-ring); }
.signal-lab .sl-btn.secondary {
  background: var(--cx-panel-2);
  color: var(--cx-text);
  border-color: var(--cx-border-strong);
}
.signal-lab .sl-btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.signal-lab .sl-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--cx-space-3);
  margin-top: var(--cx-space-4);
}

.signal-lab .sl-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  min-height: 2rem;
  padding: 0.25rem 0.75rem;
  border-radius: 999px;
  font-weight: 700;
  font-size: var(--cx-text-sm);
  border: 1px solid var(--cx-border);
}
.signal-lab .sl-chip.ok {
  background: var(--cx-accent-soft);
  color: var(--cx-ok);
  border-color: var(--cx-ok);
}
.signal-lab .sl-chip.warn {
  background: var(--cx-accent-soft);
  color: var(--cx-warn);
  border-color: var(--cx-warn);
}
.signal-lab .sl-chip.bad {
  color: var(--cx-bad);
  border-color: var(--cx-bad);
}

/* Flip cards */
.signal-lab .flash-stage {
  perspective: 1000px;
  width: min(100%, 22rem);
  margin: 0 auto;
}
.signal-lab .flash-card {
  width: 100%;
  height: 16rem;
  position: relative;
  transform-style: preserve-3d;
  transition: transform 0.45s var(--cx-ease);
  cursor: pointer;
  border-radius: var(--cx-radius);
}
.signal-lab .flash-card.flipped { transform: rotateY(180deg); }
.signal-lab .flash-face {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  border-radius: var(--cx-radius);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--cx-space-6);
  background: var(--cx-bg-elevated);
  border: 2px solid var(--cx-accent);
  box-shadow: var(--cx-shadow);
  text-align: center;
}
.signal-lab .flash-face.back {
  transform: rotateY(180deg);
  border-color: var(--cx-warn);
  background: var(--cx-panel-2);
}
.signal-lab .flash-icon { font-size: 3rem; margin-bottom: var(--cx-space-2); }
.signal-lab .flash-term,
.signal-lab .term-chip-label { font-size: 1.75rem; font-weight: 800; }
.signal-lab .term-row {
  display: inline-flex;
  flex-direction: row;
  flex-wrap: nowrap;
  align-items: center;
  gap: 0.4rem;
  max-width: 100%;
}
.signal-lab .term-chip {
  display: inline-flex;
  flex-direction: row;
  flex-wrap: nowrap;
  align-items: center;
  justify-content: center;
  gap: 0.25rem;
  max-width: 100%;
  min-height: 2.25rem;
  padding: 0.15rem 0.7rem;
  border-radius: 999px;
  border: 2px solid var(--cx-border-strong);
  background: var(--cx-panel-2);
  box-sizing: border-box;
}
.signal-lab .flash-term-row {
  margin: 0.15rem 0 0.35rem;
}
.signal-lab .term-chip .term-chip-label,
.signal-lab .term-chip .flash-term {
  display: inline;
  white-space: nowrap;
  line-height: 1.2;
  font-size: clamp(1.1rem, 4.5vw, 1.75rem);
}
.signal-lab .term-row .help-tip {
  position: relative;
  display: inline-flex;
  flex: 0 0 auto;
  align-items: center;
  justify-content: center;
  width: var(--cx-touch);
  height: var(--cx-touch);
  min-width: var(--cx-touch);
  min-height: var(--cx-touch);
  margin-left: 0;
  vertical-align: middle;
}
.signal-lab .term-row .help-tip-btn,
.signal-lab .term-chip .help-tip-btn {
  width: 1.25rem;
  height: 1.25rem;
  min-width: 1.25rem;
  min-height: 1.25rem;
  border-radius: 999px;
  border: 2px solid var(--cx-accent);
  background: var(--cx-bg-elevated);
  color: var(--cx-accent);
  font-size: 0.7rem;
  font-weight: 800;
  line-height: 1;
  padding: 0;
  box-shadow: none;
}
.signal-lab .term-chip .help-tip-panel,
.signal-lab .term-chip .help-tip-panel[hidden] {
  top: calc(var(--cx-touch) - 0.15rem);
  left: 50%;
  transform: translateX(-50%);
}
.signal-lab .trial-q .term-chip {
  margin: 0 0 0.35rem;
}
.signal-lab .trial-q .term-chip .term-chip-label {
  font-size: clamp(1rem, 3.8vw, 1.25rem);
}
.signal-lab .term-chip-num {
  font-weight: 700;
  color: var(--cx-muted);
  font-size: 0.95rem;
  margin-right: 0.15rem;
}
.signal-lab .flash-def { font-size: 1.15rem; font-weight: 700; line-height: 1.35; }

.signal-lab .hop-row,
.signal-lab .scrap-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--cx-space-2);
  margin: var(--cx-space-3) 0;
}
.signal-lab .hop-btn,
.signal-lab .scrap-btn {
  appearance: none;
  min-height: 2.25rem;
  min-width: 2.25rem;
  padding: 0.2rem 0.7rem;
  border-radius: var(--cx-radius-sm);
  border: 2px solid var(--cx-border-strong);
  background: var(--cx-panel-2);
  color: var(--cx-text);
  font-weight: 700;
  cursor: pointer;
}
.signal-lab .hop-btn.on,
.signal-lab .scrap-btn.on {
  background: var(--cx-accent-soft);
  border-color: var(--cx-ok);
  color: var(--cx-ok);
}
.signal-lab .hop-btn.wrong,
.signal-lab .scrap-btn.wrong,
.signal-lab .path-stop.wrong,
.signal-lab .match-item.wrong {
  border-color: var(--cx-bad);
  background: color-mix(in srgb, var(--cx-bad) 18%, var(--cx-panel-2));
  color: var(--cx-bad);
}

/* Match + fortress */
.signal-lab .match-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--cx-space-3);
}
@media (max-width: 640px) {
  .signal-lab .match-grid { grid-template-columns: 1fr; }
}
.signal-lab .match-col {
  display: flex;
  flex-direction: column;
  gap: var(--cx-space-2);
}
.signal-lab .match-row {
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 0.35rem;
}
.signal-lab .match-item {
  min-height: 2.25rem;
  padding: 0.3rem 0.7rem;
  border-radius: var(--cx-radius-sm);
  border: 2px solid var(--cx-border);
  background: var(--cx-panel-2);
  cursor: pointer;
  text-align: left;
  font-weight: 650;
  color: var(--cx-text);
}
.signal-lab .match-item.match-term-chip {
  display: inline-flex;
  flex: 1 1 auto;
  flex-direction: row;
  align-items: center;
  justify-content: flex-start;
  width: auto;
  text-align: left;
  border-radius: var(--cx-radius-sm);
  padding: 0.3rem 0.7rem;
  font-weight: 650;
  cursor: pointer;
}
.signal-lab .match-term-chip .term-chip-label {
  font-size: var(--cx-text-base);
  font-weight: 650;
  flex: 1 1 auto;
  text-align: left;
}
.signal-lab .match-item.selected {
  border-color: var(--cx-accent);
  background: var(--cx-accent-soft);
}
.signal-lab .match-item.matched {
  border-color: var(--cx-ok);
  background: color-mix(in srgb, var(--cx-ok) 18%, var(--cx-panel-2));
  color: var(--cx-ok);
  pointer-events: none;
}

.signal-lab .fortress {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(7rem, 1fr));
  gap: var(--cx-space-3);
}
.signal-lab .door {
  min-height: 5rem;
  border-radius: var(--cx-radius-sm);
  border: 2px dashed var(--cx-border-strong);
  background: var(--cx-bg-elevated);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.25rem;
  cursor: pointer;
  font-weight: 700;
  color: var(--cx-text);
}
.signal-lab .door.built {
  border-style: solid;
  border-color: var(--cx-ok);
  background: var(--cx-accent-soft);
}
.signal-lab .door.first-pick {
  outline: 2px solid var(--cx-warn);
}

.signal-lab .mini-stage {
  background: var(--cx-bg-elevated);
  border: 1px solid var(--cx-border);
  border-radius: var(--cx-radius);
  padding: var(--cx-space-4);
  text-align: center;
}
.signal-lab .mini-ball {
  width: 3.5rem;
  height: 3.5rem;
  border-radius: 50%;
  margin: 1rem auto;
  background: var(--cx-accent);
  transition: background var(--cx-motion) var(--cx-ease), transform 0.4s var(--cx-ease);
}
.signal-lab .mini-ball.alt {
  background: var(--cx-ok);
  transform: scale(1.25);
}

.signal-lab .path-draw {
  display: flex;
  flex-wrap: wrap;
  gap: var(--cx-space-2);
  margin: var(--cx-space-3) 0;
}
.signal-lab .path-stop {
  min-height: var(--cx-touch);
  padding: 0.5rem 0.85rem;
  border-radius: 999px;
  border: 2px solid var(--cx-border);
  background: var(--cx-panel-2);
  cursor: pointer;
  font-weight: 700;
  color: var(--cx-text);
}
.signal-lab .path-stop.picked {
  border-color: var(--cx-accent);
  background: var(--cx-accent-soft);
}
.signal-lab .path-stop.used { opacity: 0.4; pointer-events: none; }

.signal-lab .sl-figure {
  width: 100%;
  border-radius: var(--cx-radius-sm);
  border: 1px solid var(--cx-border);
  margin: var(--cx-space-3) 0;
  background: var(--cx-bg-elevated);
}

.signal-lab .trial-q {
  margin-bottom: var(--cx-space-4);
  padding-bottom: var(--cx-space-3);
  border-bottom: 1px solid var(--cx-border);
}
.signal-lab .trial-q label {
  display: block;
  font-weight: 700;
  margin-bottom: var(--cx-space-2);
}
.signal-lab .trial-q textarea,
.signal-lab .trial-q input[type="text"],
.signal-lab .trial-q select {
  width: 100%;
  min-height: var(--cx-touch);
  padding: 0.65rem 0.85rem;
  border-radius: var(--cx-radius-sm);
  border: 1px solid var(--cx-border-strong);
  background: var(--cx-bg-elevated);
  color: var(--cx-text);
  font: inherit;
  box-sizing: border-box;
}
.signal-lab .trial-q textarea { min-height: 4.5rem; resize: vertical; }
.signal-lab .quiz-opts {
  display: flex;
  flex-direction: column;
  gap: var(--cx-space-2);
}
.signal-lab .quiz-opt {
  appearance: none;
  text-align: left;
  min-height: 2.25rem;
  padding: 0.3rem 0.75rem;
  border-radius: var(--cx-radius-sm);
  border: 2px solid var(--cx-border-strong);
  background: var(--cx-panel-2);
  color: var(--cx-text);
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}
.signal-lab .quiz-opt.picked {
  border-color: var(--cx-accent);
  background: var(--cx-accent-soft);
}

.signal-lab .sl-block[hidden] { display: none !important; }

/* Amber return dock — BIP39 grammar; colour from --cx-warn tokens only */
.signal-lab .sl-dock {
  position: fixed;
  left: max(0.75rem, env(safe-area-inset-left));
  right: max(0.75rem, env(safe-area-inset-right));
  bottom: max(0.85rem, env(safe-area-inset-bottom));
  z-index: var(--cx-z-modal);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--cx-space-3);
  max-width: min(42rem, calc(100vw - 1.5rem));
  margin: 0 auto;
  padding: 0.75rem 1rem;
  background: var(--cx-panel-2);
  border: 2px solid var(--cx-warn);
  border-radius: var(--cx-radius);
  box-shadow: var(--cx-shadow);
  color: var(--cx-text);
}
.signal-lab .sl-dock .sl-btn {
  background: var(--cx-warn);
  color: var(--cx-bg);
  border-color: var(--cx-warn);
}
.signal-lab .sl-dock .sl-btn.secondary {
  background: var(--cx-panel);
  color: var(--cx-text);
  border-color: var(--cx-border-strong);
}
.signal-lab .sl-dock-hint {
  flex: 1 1 12rem;
  margin: 0;
  font-size: var(--cx-text-sm);
  color: var(--cx-muted);
}

.signal-lab .help-tip {
  position: relative;
  display: inline-flex;
  margin-left: 0.25rem;
  vertical-align: middle;
  align-items: center;
  justify-content: center;
  min-width: 44px;
  min-height: 44px;
}
.signal-lab .help-tip-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.25rem;
  height: 1.25rem;
  min-width: 1.25rem;
  min-height: 1.25rem;
  border-radius: 999px;
  border: 1px solid var(--cx-border-strong);
  background: var(--cx-accent-soft); color: var(--cx-accent);
  font-size: 0.7rem; font-weight: 800; cursor: pointer; line-height: 1;
  flex: 0 0 auto;
  padding: 0;
}
.signal-lab .help-tip-panel,
.signal-lab .help-tip-panel[hidden] {
  display: none;
  position: absolute; left: 0; top: calc(100% + 0.35rem); z-index: var(--cx-z-overlay);
  width: min(18rem, 70vw); padding: 0.65rem 0.75rem;
  background: var(--cx-bg-elevated); color: var(--cx-text);
  border: 1px solid var(--cx-border-strong); border-radius: var(--cx-radius-sm);
  box-shadow: var(--cx-shadow); font-size: var(--cx-text-sm); font-weight: 500;
  white-space: normal; overflow-wrap: anywhere; word-wrap: break-word;
}
.signal-lab .help-tip:hover .help-tip-panel,
.signal-lab .help-tip:hover .help-tip-panel[hidden],
.signal-lab .help-tip:focus-within .help-tip-panel,
.signal-lab .help-tip:focus-within .help-tip-panel[hidden],
.signal-lab .help-tip.is-open .help-tip-panel,
.signal-lab .help-tip.is-open .help-tip-panel[hidden] {
  display: block !important;
}
.signal-lab .help-tip.tip-force-hide .help-tip-panel,
.signal-lab .help-tip.tip-force-hide .help-tip-panel[hidden] {
  display: none !important;
}

.signal-lab .sl-status {
  min-height: 1.25rem;
  margin-top: var(--cx-space-2);
  font-size: var(--cx-text-sm);
}
.signal-lab .sl-status.err { color: var(--cx-bad); font-weight: 700; }
.signal-lab .sl-status.ok { color: var(--cx-ok); font-weight: 700; }

.signal-lab .sl-refs ul {
  list-style: none;
  padding: 0;
  margin: 0;
}
.signal-lab .sl-refs li {
  margin: var(--cx-space-2) 0;
}
.signal-lab .sl-refs a {
  color: var(--cx-accent);
  font-weight: 700;
}

.signal-lab footer.sl-foot {
  margin-top: var(--cx-space-6);
  color: var(--cx-muted);
  font-size: var(--cx-text-sm);
  text-align: center;
}

.signal-lab .sl-nav-pills {
  display: flex; flex-wrap: wrap; gap: var(--cx-space-2);
  margin-bottom: var(--cx-space-4);
}
.signal-lab .sl-nav-pills button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  box-sizing: border-box;
  min-height: var(--cx-touch);
  height: var(--cx-touch);
  padding: 0 0.85rem;
  line-height: 1;
  border-radius: 999px;
  border: 1px solid var(--cx-border);
  background: var(--cx-panel);
  color: var(--cx-muted);
  font-weight: 650;
  cursor: pointer;
  vertical-align: middle;
}
.signal-lab .sl-nav-pills button[aria-current="true"] {
  background: var(--cx-accent-soft);
  color: var(--cx-accent);
  border-color: var(--cx-accent);
}

/* Session Reset — amber dock secondary; tokens only; ≥4.5:1 dark+light */
.signal-lab #session-reset,
.signal-lab #session-reset-start,
.signal-lab .sl-dock #session-reset {
  background: var(--cx-panel-2);
  color: var(--cx-warn);
  border: 2px solid var(--cx-warn);
  font-weight: 800;
  min-height: var(--cx-touch);
  min-width: var(--cx-touch);
}
.signal-lab #session-reset:hover,
.signal-lab #session-reset-start:hover,
.signal-lab .sl-dock #session-reset:hover {
  background: var(--cx-panel);
  color: var(--cx-warn);
  border-color: var(--cx-warn);
}
.signal-lab #session-reset:focus-visible,
.signal-lab #session-reset-start:focus-visible {
  outline: none;
  box-shadow: var(--cx-focus-ring);
}

/* Packet sticker beat — HEADER/PAYLOAD panel; tokens only ≥4.5:1 */
.signal-lab #ex-header-payload {
  margin-top: var(--cx-space-3);
  padding: var(--cx-space-3) var(--cx-space-4);
  border: 2px dashed var(--cx-border-strong);
  border-radius: var(--cx-radius);
  background: var(--cx-panel-2);
  color: var(--cx-text);
  box-shadow: none;
}
.signal-lab #ex-header-payload .sl-packet-title {
  margin: 0;
  font-weight: 800;
  color: var(--cx-text);
}
.signal-lab #ex-header-payload .sl-packet-body {
  margin: var(--cx-space-2) 0 0;
  color: var(--cx-text);
  font-size: var(--cx-text-sm);
}
.signal-lab #ex-header-payload .sl-packet-body strong {
  color: var(--cx-accent);
  font-weight: 800;
}