/* =========================================================
   LAB — experimental / unconventional slide types
   Includes: misconception, pause, derivation, counterfactual,
   recall split, devil's advocate, typewriter, reverse, arXiv-quote.
   ========================================================= */

/* ---------- MISCONCEPTION ---------- */
.slide[data-type="misconception"] .slide-body {
  display: grid;
  grid-template-rows: auto 1fr auto;
  gap: var(--sp-4);
  height: 100%;
}
.misc-card {
  align-self: center;
  background: var(--c-red-soft);
  border-left: 8px solid var(--c-red);
  border-radius: var(--r-md);
  padding: var(--sp-5) var(--sp-6);
  position: relative;
}
.misc-card::before {
  content: "✗";
  position: absolute;
  top: 24px; right: 32px;
  font-size: 64px;
  color: var(--c-red);
  font-family: var(--font-serif);
  opacity: 0.5;
}
.misc-label {
  font-family: var(--font-mono);
  font-size: var(--fs-label);
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--c-red);
  margin-bottom: var(--sp-3);
  font-weight: 600;
}
.misc-statement {
  font-family: var(--font-serif);
  font-size: 60px;
  line-height: 1.15;
  font-style: italic;
  color: var(--ink);
  margin-bottom: var(--sp-4);
}
.misc-reveal-btn {
  background: var(--c-red);
  color: white;
  border: none;
  padding: 14px 28px;
  font-family: var(--font-mono);
  font-size: var(--fs-tiny);
  border-radius: var(--r-pill);
  cursor: pointer;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}
.misc-reveal-btn:hover { filter: brightness(1.1); }
.misc-truth {
  margin-top: var(--sp-5);
  padding: var(--sp-4) var(--sp-5);
  background: var(--c-green-soft);
  border-left: 8px solid var(--c-green);
  border-radius: var(--r-md);
  display: none;
  font-family: var(--font-sans);
  font-size: 32px;
  line-height: 1.4;
  color: var(--ink);
  animation: miscReveal 0.5s var(--ease) both;
}
.misc-truth::before {
  content: "✓ ";
  font-family: var(--font-serif);
  color: var(--c-green);
  font-weight: 700;
  margin-right: 8px;
}
.slide[data-type="misconception"].is-truth-shown .misc-truth { display: block; }
.slide[data-type="misconception"].is-truth-shown .misc-reveal-btn { display: none; }
@keyframes miscReveal {
  from { opacity: 0; transform: translateY(-12px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ---------- PAUSE ---------- */
.slide[data-type="pause"] { display: none; }
.slide[data-type="pause"].is-active {
  display: grid;
  place-items: center;
  background: var(--ink);
  color: var(--bg);
}
/* Decision checkpoints used to shrink to a 26px term in a shallow card.
   Give the question—not empty canvas—the dominant visual area. This remains a
   shared pattern for all def-card pause slides, with the original phrase/timer
   pause variant unchanged. */
.slide[data-type="pause"].is-active:has(.slide-body > .def-card) {
  display: block;
}
.slide[data-type="pause"]:has(.slide-body > .def-card) .slide-body {
  height: 100%;
  display: grid;
  grid-template-rows: auto 1fr;
  place-items: stretch;
}
.slide[data-type="pause"]:has(.slide-body > .def-card) .slide-header h2 { color: var(--bg); }
.slide[data-type="pause"]:has(.slide-body > .def-card) .def-card {
  align-self: center;
  width: 100%;
  min-height: 500px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 60px 84px;
  background: var(--bg);
  color: var(--ink);
  border: 3px solid var(--bg);
  box-shadow: 12px 12px 0 var(--rule-strong);
}
.slide[data-type="pause"]:has(.slide-body > .def-card) .def-tag { font-size: var(--fs-tiny); margin-bottom: var(--sp-3); }
.slide[data-type="pause"]:has(.slide-body > .def-card) .def-term { font-size: 64px; line-height: 1.1; max-width: 29ch; margin-bottom: var(--sp-4); }
.slide[data-type="pause"]:has(.slide-body > .def-card) .def-body { font-size: var(--fs-small); max-width: 63ch; }
.pause-phrase {
  font-family: var(--font-serif);
  font-size: var(--fs-h1);
  line-height: 1.1;
  text-align: center;
  font-style: italic;
  max-width: 1400px;
  color: var(--bg);
}
.pause-timer {
  margin-top: var(--sp-7);
  font-family: var(--font-mono);
  font-size: 200px;
  color: var(--c-amber);
  font-variant-numeric: tabular-nums;
  line-height: 1;
  letter-spacing: -0.02em;
}
.pause-timer.is-finished { color: var(--c-green); animation: pauseDone 0.6s ease; }
.pause-timer.is-running::after {
  content: "";
  display: block;
  margin: 24px auto 0;
  width: 200px; height: 4px;
  background: linear-gradient(90deg, var(--c-amber), transparent);
  animation: pauseBar var(--pause-duration, 30s) linear forwards;
}
@keyframes pauseBar { from { width: 0; } to { width: 100%; } }
@keyframes pauseDone {
  0% { transform: scale(1); }
  50% { transform: scale(1.08); }
  100% { transform: scale(1); }
}
.pause-controls {
  position: absolute;
  bottom: var(--sp-5);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 12px;
}
.pause-controls button {
  background: rgba(255,255,255,0.1);
  color: var(--bg);
  border: 1px solid rgba(255,255,255,0.2);
  padding: 10px 22px;
  font-family: var(--font-mono);
  font-size: var(--fs-label-xs);
  border-radius: var(--r-pill);
  cursor: pointer;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}
.pause-controls button:hover { background: rgba(255,255,255,0.2); }

/* ---------- DERIVATION ---------- */
.slide[data-type="derivation"] .slide-body {
  display: grid;
  grid-template-rows: auto 1fr auto;
  gap: var(--sp-3);
  height: 100%;
}
.deriv-stage {
  display: grid;
  place-items: center;
  position: relative;
  padding: var(--sp-5);
}
.deriv-form {
  font-family: var(--font-serif);
  font-size: var(--fs-math-big);
  line-height: 1.2;
  position: relative;
  white-space: nowrap;
}
/* Each term is positioned individually so it can FLIP. */
.deriv-term {
  display: inline-block;
  transition: transform 0.6s var(--ease), opacity 0.4s var(--ease);
  will-change: transform;
}
.deriv-term.is-new {
  animation: derivEnter 0.5s var(--ease) both;
}
.deriv-term.is-removing {
  animation: derivExit 0.3s var(--ease) both;
}
.deriv-term.is-highlight {
  color: var(--c-red);
  background: var(--c-red-soft);
  padding: 0 6px;
  border-radius: 4px;
}
@keyframes derivEnter {
  from { opacity: 0; transform: translateY(-30px) scale(0.7); }
  to   { opacity: 1; transform: translateY(0) scale(1); }
}
@keyframes derivExit {
  from { opacity: 1; transform: scale(1); }
  to   { opacity: 0; transform: scale(0.7); }
}
.deriv-step-caption {
  text-align: center;
  font-family: var(--font-sans);
  font-size: var(--fs-small);
  color: var(--ink-2);
  font-style: italic;
}
.deriv-stepper {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--sp-2) var(--sp-4);
  background: var(--bg-alt);
  border-radius: var(--r-md);
  font-family: var(--font-mono);
}

/* ---------- COUNTERFACTUAL TOGGLE ---------- */
.cf-toggle-bar {
  display: inline-flex;
  align-items: center;
  background: var(--bg-alt);
  border-radius: var(--r-pill);
  padding: 4px;
  font-family: var(--font-mono);
  margin-bottom: var(--sp-3);
}
.cf-toggle-bar button {
  background: transparent;
  border: none;
  padding: 10px 24px;
  font-size: var(--fs-label);
  border-radius: var(--r-pill);
  cursor: pointer;
  color: var(--ink-2);
  font-weight: 600;
  letter-spacing: 0.04em;
}
.cf-toggle-bar button.is-active {
  background: var(--accent);
  color: white;
}
.cf-variant { display: none; }
.cf-variant.is-active { display: block; animation: derivEnter 0.4s var(--ease); }

/* ---------- RECALL split-screen ---------- */
.recall-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--c-cyan-soft);
  color: var(--c-cyan);
  padding: 6px 14px;
  border-radius: var(--r-pill);
  font-family: var(--font-mono);
  font-size: var(--fs-tiny);
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  letter-spacing: 0.04em;
  border: 2px solid transparent;
  transition: all var(--dur) var(--ease);
}
.recall-link::before { content: "↺ "; font-size: 0.9em; }
.recall-link:hover { border-color: var(--c-cyan); }

.recall-overlay {
  position: fixed;
  inset: 0;
  background: rgba(10,13,19,0.92);
  backdrop-filter: blur(8px);
  z-index: 300;
  display: none;
  padding: 40px;
}
.recall-overlay.is-visible { display: grid; place-items: center; }
.recall-split {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 32px;
  align-items: center;
  width: 100%;
  max-width: 1700px;
}
.recall-thumb {
  position: relative;
  width: 100%;
  aspect-ratio: 16/9;
  border-radius: 12px;
  overflow: hidden;
  background: var(--bg);
  container-type: inline-size;
  border: 3px solid var(--rule-strong);
}
.recall-thumb.is-current { border-color: var(--accent); }
.recall-thumb.is-past { border-color: var(--c-cyan); }
.recall-thumb > .slide {
  position: absolute !important;
  inset: 0 !important;
  width: 1920px !important;
  height: 1080px !important;
  padding: var(--slide-pad-top) var(--slide-pad-x) var(--slide-pad-bottom) !important;
  transform: scale(calc(100cqw / 1920px));
  transform-origin: top left;
  pointer-events: none;
  background: var(--bg);
}
.recall-thumb-label {
  position: absolute;
  bottom: 12px; left: 16px;
  background: rgba(0,0,0,0.7);
  color: white;
  padding: 6px 14px;
  border-radius: 6px;
  font-family: var(--font-mono);
  font-size: var(--fs-fine-sm);
  letter-spacing: 0.08em;
}
.recall-arrow {
  font-family: var(--font-serif);
  font-size: 80px;
  color: var(--c-cyan);
}
.recall-close {
  position: absolute;
  top: 24px; right: 32px;
  background: rgba(255,255,255,0.15);
  color: white;
  border: none;
  padding: 10px 20px;
  border-radius: var(--r-pill);
  font-family: var(--font-mono);
  font-size: var(--fs-fine);
  cursor: pointer;
}

/* ---------- DEVIL'S ADVOCATE overlay ---------- */
.devil-overlay {
  position: absolute;
  top: 0; right: 0;
  width: 44%;
  height: 100%;
  background: linear-gradient(180deg, var(--ink) 0%, #1a1f2b 100%);
  color: var(--bg);
  padding: var(--sp-6) var(--sp-5);
  z-index: 60;
  transform: translateX(100%);
  transition: transform var(--dur-slow) var(--ease);
  font-family: var(--font-sans);
  overflow: auto;
  border-left: 6px solid var(--c-red);
}
.slide.is-devil .devil-overlay { transform: translateX(0); }
.devil-overlay .devil-head {
  font-family: var(--font-mono);
  font-size: var(--fs-label);
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--c-red);
  margin-bottom: var(--sp-3);
  display: flex; align-items: center; gap: 12px;
}
.devil-overlay .devil-head::before {
  content: "⚔"; font-size: var(--fs-label-xl);
}
.devil-overlay h3 {
  font-family: var(--font-serif);
  font-size: var(--fs-lead);
  line-height: 1.15;
  color: var(--bg);
  margin: 0 0 var(--sp-3);
}
.devil-overlay p {
  font-size: var(--fs-caption);
  line-height: 1.45;
  color: rgba(236,231,216,0.85);
}
.devil-overlay .devil-close {
  position: absolute;
  top: 16px; right: 16px;
  background: rgba(255,255,255,0.1);
  border: none;
  color: white;
  padding: 6px 16px;
  border-radius: var(--r-pill);
  font-family: var(--font-mono);
  font-size: var(--fs-fine-sm);
  cursor: pointer;
}

/* ---------- TYPEWRITER ---------- */
.typewriter {
  font-family: inherit;
  /* The text content is split into characters by JS; each char fades+drifts in. */
}
.typewriter .tw-char {
  display: inline-block;
  opacity: 0;
  animation: twChar 0.04s linear forwards;
}
@keyframes twChar {
  from { opacity: 0; transform: translateY(-2px); }
  to   { opacity: 1; transform: translateY(0); }
}
.typewriter .tw-char.is-space { width: 0.25em; }

/* ---------- REVERSE rewind ---------- */
/* Layer-stack reveal — shared by the `reverse` (result→input) and `forward`
   (input→result) slide types. Same markup/animation; only lab.js's paint()
   maps the narrative step to a different layer per direction. */
.slide[data-type="reverse"] .slide-body,
.slide[data-type="forward"] .slide-body {
  display: grid;
  grid-template-rows: auto 1fr auto;
  gap: var(--sp-3);
  height: 100%;
}
.reverse-stack {
  position: relative;
  display: grid;
  place-items: center;
  padding: var(--sp-4);
  min-height: 600px;
}
.reverse-layer {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  padding: var(--sp-4);
  transition: opacity 0.5s var(--ease), transform 0.5s var(--ease);
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  text-align: center;
  color: var(--ink);
}
.reverse-layer[data-state="below"] {
  opacity: 0;
  transform: scale(0.92);
  pointer-events: none;
}
.reverse-layer[data-state="active"] {
  opacity: 1;
  transform: scale(1);
}
.reverse-layer[data-state="above"] {
  opacity: 0;
  transform: scale(1.08);
  pointer-events: none;
}
.reverse-counter {
  text-align: center;
  font-family: var(--font-mono);
  font-size: var(--fs-label);
  color: var(--ink-3);
  letter-spacing: 0.1em;
}
/* Bilingual, per-type navigation hint (text supplied in the HTML so the
   lang toggle works — replaces the old English-only ::before). */
.reverse-hint {
  display: block;
  font-family: var(--font-sans);
  font-size: var(--fs-fine-xs);
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--ink-4);
  margin-bottom: 6px;
}
.reverse-hint kbd {
  font-family: var(--font-mono);
  font-size: var(--fs-fine-xs);
  background: var(--bg-2, rgba(0,0,0,.06));
  border-radius: 4px;
  padding: 1px 5px;
}

/* ---------- arXiv-quote ---------- */
arxiv-quote {
  display: block;
  background: var(--bg-card);
  border: 2px solid var(--rule);
  border-left: 8px solid var(--c-violet);
  border-radius: var(--r-md);
  padding: var(--sp-4) var(--sp-5);
  margin: var(--sp-3) 0;
  position: relative;
}
arxiv-quote .aq-meta {
  font-family: var(--font-mono);
  font-size: var(--fs-label-xs);
  color: var(--c-violet);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 8px;
  display: flex; gap: 8px; align-items: center;
}
arxiv-quote .aq-meta::before {
  content: "📄"; /* arxiv-y, replaced by SVG would be better */
  filter: grayscale(1);
}
arxiv-quote .aq-title {
  font-family: var(--font-serif);
  font-size: 32px;
  line-height: 1.2;
  color: var(--ink);
  margin: 0 0 12px;
}
arxiv-quote .aq-body {
  font-family: var(--font-sans);
  font-size: var(--fs-tiny);
  line-height: 1.5;
  color: var(--ink-2);
}
arxiv-quote .aq-loading {
  font-family: var(--font-mono);
  color: var(--ink-3);
  font-size: var(--fs-label-sm);
  font-style: italic;
}
arxiv-quote .aq-error {
  color: var(--c-red);
  font-family: var(--font-mono);
  font-size: var(--fs-label-xs);
}

/* ---------- Pyodide live code ---------- */
.pyodide-runner {
  margin: var(--sp-3) 0;
  border-radius: var(--r-md);
  overflow: hidden;
  border: var(--hairline) solid var(--rule);
}
.pyodide-runner .py-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
}
.pyodide-runner .py-editor {
  background: var(--bg-inset);
  padding: var(--sp-3) var(--sp-4);
}
:root[data-theme="dark"] .pyodide-runner .py-editor { background: #0B0E14; }
.pyodide-runner .py-editor pre {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--fs-code-sm);
  line-height: 1.4;
  white-space: pre;
  overflow-x: auto;
  min-height: 200px;
}
.pyodide-runner .py-output {
  background: var(--bg-card);
  padding: var(--sp-3) var(--sp-4);
  border-left: var(--hairline) solid var(--rule);
  display: flex; flex-direction: column;
}
.pyodide-runner .py-head {
  font-family: var(--font-mono);
  font-size: var(--fs-label-xs);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--ink-3);
  margin-bottom: var(--sp-2);
  display: flex; justify-content: space-between; align-items: center;
}
.pyodide-runner .py-run-btn {
  background: var(--c-green);
  color: white;
  border: none;
  border-radius: var(--r-sm);
  padding: 6px 18px;
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: var(--fs-label-xs);
  cursor: pointer;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.pyodide-runner .py-run-btn:disabled { background: var(--ink-3); cursor: wait; }
.pyodide-runner .py-out {
  flex: 1;
  font-family: var(--font-mono);
  font-size: var(--fs-label);
  line-height: 1.4;
  white-space: pre-wrap;
  word-break: break-word;
  color: var(--ink);
  min-height: 200px;
}
.pyodide-runner .py-out .err { color: var(--c-red); }
.pyodide-runner .py-status {
  font-family: var(--font-mono);
  font-size: var(--fs-fine-sm);
  color: var(--ink-3);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}