/* =========================================================================
   COMPONENTS — Rail lateral, topbar, cards, paleta, diagramas
   ========================================================================= */

/* — Ambient backdrop (subtle warm grain — additive, not subtractive) — */
.ambient {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 1;
  background:
    url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='160' height='160'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/><feColorMatrix values='0 0 0 0 1 0 0 0 0 0.85 0 0 0 0 0.6 0 0 0 0.07 0'/></filter><rect width='100%' height='100%' filter='url(%23n)'/></svg>");
  mix-blend-mode: soft-light;
  opacity: 0.55;
}

/* — Subtle horizon glow stripe (the warm band where sky meets buildings) — */
.ambient::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 30%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--sunset-2), var(--sun), var(--sunset-2), transparent);
  opacity: 0.18;
  filter: blur(2px);
}

/* =========================================================================
   TOPBAR
   ========================================================================= */

.topbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--topbar-height);
  z-index: 100;
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  padding: 0 32px;
  background: linear-gradient(180deg, var(--bg-deep) 0%, rgba(20, 16, 26, 0.85) 70%, transparent 100%);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  transition: opacity 0.3s ease;
}

.topbar .branding {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.topbar .eyebrow {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--sunset-3);
  margin: 0;
  display: flex;
  align-items: center;
  gap: 8px;
}

.topbar .eyebrow::before {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--brand);
  box-shadow: 0 0 8px var(--brand-glow);
  animation: brand-pulse 2.4s ease-in-out infinite;
}

@keyframes brand-pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.55; transform: scale(0.85); }
}

.topbar .title {
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 500;
  color: var(--text-primary);
  margin: 0;
  letter-spacing: -0.005em;
}

.topbar .status {
  display: flex;
  align-items: center;
  gap: 18px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-secondary);
}

.topbar .mode-badge {
  font-weight: 700;
  letter-spacing: 0.18em;
  padding: 4px 10px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--hairline);
  color: var(--sunset-3);
  background: var(--bg-panel);
}

.topbar .mode-badge.is-focus {
  color: var(--brand);
  border-color: var(--brand);
  box-shadow: 0 0 0 4px var(--brand-glow);
}

.topbar .counter {
  color: var(--sky-glow);
  letter-spacing: 0.12em;
}

.topbar .hint {
  color: var(--text-muted);
  letter-spacing: 0.05em;
}

/* Zoom control cluster (in topbar) */
.zoom-controls {
  display: inline-flex;
  align-items: stretch;
  border: 1px solid var(--hairline);
  border-radius: var(--radius-pill);
  overflow: hidden;
  background: var(--bg-panel);
  margin-right: 8px;
}

.zoom-btn {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.04em;
  padding: 4px 10px;
  cursor: pointer;
  transition: all 0.18s ease;
  min-width: 32px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.zoom-btn:hover {
  color: var(--brand);
  background: var(--bg-elevated);
}

.zoom-btn:active {
  transform: scale(0.95);
}

.zoom-btn.zoom-level {
  border-left: 1px solid var(--hairline);
  border-right: 1px solid var(--hairline);
  color: var(--sky-glow);
  min-width: 48px;
}

/* =========================================================================
   PROGRESS BAR
   ========================================================================= */

.progress-track {
  position: fixed;
  top: var(--topbar-height);
  left: 0;
  right: 0;
  height: 2px;
  background: var(--bg-panel);
  z-index: 99;
}

.progress-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--sunset-1), var(--sunset-3), var(--brand));
  box-shadow: 0 0 12px var(--brand-glow);
  transition: width 0.4s cubic-bezier(0.22, 1, 0.36, 1);
}

/* =========================================================================
   RAIL — Navegación lateral por módulos
   ========================================================================= */

.rail {
  position: fixed;
  top: var(--topbar-height);
  left: 0;
  bottom: 64px;
  width: var(--rail-width);
  z-index: 95;
  padding: 32px 24px 24px;
  overflow-y: auto;
  background: linear-gradient(180deg, transparent 0, rgba(20, 16, 26, 0.65) 30%, rgba(20, 16, 26, 0.85) 100%);
  border-right: 1px solid var(--hairline);
  transition: transform 0.4s cubic-bezier(0.22, 1, 0.36, 1), opacity 0.3s ease;
}

.rail-header {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin: 0 0 24px;
}

.rail-module {
  display: block;
  width: 100%;
  background: none;
  border: none;
  border-left: 2px solid transparent;
  padding: 12px 0 12px 16px;
  margin: 0;
  text-align: left;
  cursor: pointer;
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
  transition: all 0.25s ease;
  position: relative;
}

.rail-module:hover {
  color: var(--text-primary);
  border-left-color: var(--sunset-2);
}

.rail-module.is-active {
  color: var(--text-primary);
  border-left-color: var(--brand);
}

.rail-module .rail-num {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--sunset-3);
  margin-right: 8px;
  font-weight: 600;
  letter-spacing: 0.06em;
}

.rail-module.is-active .rail-num {
  color: var(--brand);
}

.rail-dots {
  display: flex;
  gap: 5px;
  margin-top: 6px;
  margin-left: 16px;
}

.rail-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--bg-elevated);
  transition: all 0.25s ease;
}

.rail-dot.is-visited {
  background: var(--sunset-2);
  opacity: 0.7;
}

.rail-dot.is-current {
  background: var(--brand);
  box-shadow: 0 0 6px var(--brand-glow);
  transform: scale(1.4);
}

/* =========================================================================
   DECK CONTROLS (footer)
   ========================================================================= */

.deck-controls {
  position: fixed;
  bottom: 0;
  left: var(--rail-width);
  right: 0;
  height: 64px;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 12px;
  padding: 0 32px;
  background: linear-gradient(0deg, var(--bg-deep) 0%, transparent 100%);
  pointer-events: none;  /* gradient passes through */
}

.deck-controls > .deck-btn {
  pointer-events: auto;  /* but buttons stay clickable */
}

.deck-btn {
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 500;
  padding: 10px 20px;
  border-radius: var(--radius-pill);
  cursor: pointer;
  transition: all 0.25s ease;
  letter-spacing: -0.005em;
}

.deck-btn.ghost {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--hairline);
}

.deck-btn.ghost:hover {
  color: var(--text-primary);
  border-color: var(--sunset-2);
  background: var(--bg-panel);
}

.deck-btn.solid {
  background: var(--brand);
  color: var(--text-on-brand);
  border: 1px solid var(--brand);
  box-shadow: 0 4px 16px var(--brand-glow);
  font-weight: 600;
}

.deck-btn.solid:hover {
  background: var(--brand-dim);
  transform: translateY(-1px);
  box-shadow: 0 6px 20px var(--brand-glow);
}

/* =========================================================================
   SLIDE BUILDING BLOCKS
   ========================================================================= */

.slide-kicker {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--sunset-3);
  margin: 0 0 18px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.slide-kicker::before {
  content: "";
  display: inline-block;
  width: 24px;
  height: 1px;
  background: var(--sunset-2);
}

.slide-lede {
  font-family: var(--font-serif);
  font-style: italic;
  font-variation-settings: 'opsz' 144, 'SOFT' 100;
  font-size: clamp(1.4rem, 2.4vw, 2rem);
  font-weight: 400;
  line-height: 1.35;
  color: var(--text-primary);
  max-width: 32ch;
  margin: 0 0 1.4em;
}

.slide-lede em {
  color: var(--sun);
  font-weight: 500;
}

/* Two-column layout */
.two-col {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 56px;
  align-items: start;
}

.three-col {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.four-col {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}

/* — Card — luz cálida sutil arriba para sentir "sunlit" — */
.card {
  background:
    linear-gradient(180deg, rgba(255, 168, 88, 0.06) 0%, transparent 30%),
    var(--bg-panel);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-md);
  padding: 24px;
  position: relative;
  overflow: hidden;
  transition: all 0.3s ease;
  box-shadow:
    inset 0 1px 0 rgba(255, 220, 180, 0.06),
    0 4px 16px rgba(0, 0, 0, 0.25);
}

.card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--sunset-2), var(--sun), var(--sunset-2), transparent);
  opacity: 0.5;
  transition: opacity 0.3s ease;
}

.card:hover {
  border-color: var(--sunset-2);
  transform: translateY(-3px);
  box-shadow:
    inset 0 1px 0 rgba(255, 220, 180, 0.12),
    0 12px 32px rgba(255, 88, 47, 0.18);
}

.card:hover::before {
  opacity: 1;
}

.card-icon {
  font-family: var(--font-display);
  font-size: 28px;
  font-weight: 700;
  color: var(--sunset-2);
  margin: 0 0 12px;
  line-height: 1;
}

.card-title {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-primary);
  margin: 0 0 8px;
}

.card-body {
  font-size: 0.85rem;
  line-height: 1.5;
  color: var(--text-secondary);
  margin: 0;
}

/* — Stat — */
.stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 0;
  border-top: 1px solid var(--hairline);
}

.stat-value {
  font-family: var(--font-display);
  font-size: clamp(2.2rem, 4vw, 3.4rem);
  font-weight: 700;
  font-variation-settings: 'opsz' 96;
  color: var(--sun);
  line-height: 1;
  letter-spacing: -0.04em;
  text-shadow: 0 0 24px rgba(255, 212, 128, 0.35);
}

.stat-value .unit {
  font-size: 0.4em;
  color: var(--text-secondary);
  font-weight: 400;
  margin-left: 4px;
}

.stat-label {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--text-muted);
}

/* — Pill (badges) — */
.pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.06em;
  background: var(--bg-elevated);
  color: var(--sunset-3);
  border: 1px solid var(--hairline);
}

.pill.brand {
  background: var(--brand-glow);
  color: var(--brand);
  border-color: var(--brand);
}

.pill.warn {
  background: rgba(245, 160, 64, 0.12);
  color: var(--warning);
  border-color: rgba(245, 160, 64, 0.3);
}

/* — Real value callout (para corregir discrepancias memoria/código) — */
.real-value {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  font-family: var(--font-mono);
  padding: 2px 8px;
  background: var(--brand-glow);
  color: var(--brand);
  border-radius: 4px;
  font-weight: 600;
  font-size: 0.9em;
}

.real-value::before {
  content: "código:";
  font-size: 0.7em;
  opacity: 0.7;
  font-weight: 400;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

/* =========================================================================
   PALETTE WIDGET (slide 11)
   ========================================================================= */

.palette {
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  gap: 10px;
  margin: 24px 0;
}

.palette-swatch {
  aspect-ratio: 1;
  border-radius: var(--radius-sm);
  cursor: pointer;
  position: relative;
  border: 1px solid var(--hairline);
  transition: all 0.3s ease;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 10px;
  overflow: hidden;
}

.palette-swatch:hover {
  transform: scale(1.08);
  z-index: 2;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.5);
}

.palette-swatch .hex {
  font-family: var(--font-mono);
  font-size: 9px;
  font-weight: 700;
  background: rgba(0, 0, 0, 0.5);
  color: white;
  padding: 2px 5px;
  border-radius: 3px;
  opacity: 0;
  transition: opacity 0.2s ease;
  align-self: flex-start;
}

.palette-swatch:hover .hex {
  opacity: 1;
}

/* =========================================================================
   SPEAKER BADGE — top-right per-slide, indicates who is speaking
   ========================================================================= */

.speaker-badge {
  position: fixed;
  top: calc(var(--topbar-height) + 18px);
  right: 32px;
  z-index: 98;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 22px 10px 10px;
  background: var(--bg-panel);
  border: 2px solid var(--hairline);
  border-radius: var(--radius-pill);
  box-shadow: 0 10px 28px rgba(0, 0, 0, 0.45);
  transition: opacity 0.3s ease, transform 0.3s ease, border-color 0.3s ease;
  pointer-events: none;
  user-select: none;
}

.speaker-photo {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--bg-deep);
  box-sizing: border-box;
  object-fit: cover;
  border: 2px solid var(--bg-elevated);
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.speaker-meta {
  display: flex;
  flex-direction: column;
  line-height: 1;
  gap: 4px;
}

.speaker-label {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.speaker-name {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.012em;
  color: var(--text-primary);
  text-transform: none;
}

/* — Per-speaker accents — */
.speaker-badge[data-speaker="abel"] {
  border-color: rgba(255, 127, 58, 0.55);
  box-shadow: 0 10px 28px rgba(0, 0, 0, 0.45), 0 0 0 1px rgba(255, 127, 58, 0.15);
}
.speaker-badge[data-speaker="abel"] .speaker-photo {
  border-color: var(--sunset-2);
  box-shadow: 0 0 0 2px rgba(255, 127, 58, 0.25);
}

.speaker-badge[data-speaker="martin"] {
  border-color: rgba(43, 226, 102, 0.5);
  box-shadow: 0 10px 28px rgba(0, 0, 0, 0.45), 0 0 0 1px rgba(43, 226, 102, 0.15);
}
.speaker-badge[data-speaker="martin"] .speaker-photo {
  border-color: var(--brand);
  box-shadow: 0 0 0 2px rgba(43, 226, 102, 0.25);
}

/* — Focus mode: keep speaker badge visible (tribunal debe ver quién habla) — */

/* — Transition on slide change (name swap) — */
.speaker-badge.is-swapping {
  transform: translateY(-4px);
  opacity: 0;
}

/* =========================================================================
   REFERENCE CARDS (slide 6) — visual citations w/ Steam header thumbnails
   ========================================================================= */

.ref-grid {
  display: grid !important;
  grid-template-columns: repeat(4, minmax(0, 1fr)) !important;
  gap: 14px;
  width: 100%;
  align-items: stretch;
}

.ref-card {
  position: relative;
  background: var(--bg-panel);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: transform 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
  display: flex;
  flex-direction: column;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.28);
}

.ref-card:hover {
  transform: translateY(-4px);
  border-color: var(--sunset-2);
  box-shadow: 0 14px 32px rgba(255, 88, 47, 0.22);
}

.ref-card.is-key {
  border-color: var(--brand);
  box-shadow:
    0 0 0 1px var(--brand-glow),
    0 12px 28px rgba(43, 226, 102, 0.18);
}

.ref-card.is-key:hover {
  border-color: var(--brand);
  box-shadow:
    0 0 0 2px var(--brand-glow),
    0 18px 40px rgba(43, 226, 102, 0.28);
}

.ref-thumb {
  position: relative;
  width: 100%;
  aspect-ratio: 460 / 180;
  overflow: hidden;
  background: var(--bg-deep);
}

.ref-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.6s cubic-bezier(0.22, 1, 0.36, 1), filter 0.4s ease;
  filter: saturate(1.05) contrast(1.02);
}

.ref-card:hover .ref-thumb img {
  transform: scale(1.06);
  filter: saturate(1.18) contrast(1.05);
}

/* Subtle warm overlay so thumbs feel cohesive with the deck palette */
.ref-thumb::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 40%, rgba(26, 20, 40, 0.55) 100%);
  pointer-events: none;
}

.ref-body {
  padding: 10px 14px 12px;
}

.ref-title {
  font-family: var(--font-display);
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--sunset-2);
  margin: 0 0 4px;
  letter-spacing: -0.005em;
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
  line-height: 1.15;
}

.ref-card.is-key .ref-title {
  color: var(--brand);
}

.ref-tag {
  font-family: var(--font-mono);
  font-size: 8px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-on-brand);
  background: var(--brand);
  padding: 2px 6px;
  border-radius: var(--radius-pill);
}

.ref-text {
  font-size: 0.74rem;
  line-height: 1.4;
  color: var(--text-secondary);
  margin: 0;
}

/* =========================================================================
   GAME LOOP DIAGRAM (slide 9) — circular with animated traveling trace
   ========================================================================= */

.loop-layout {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: 40px;
  align-items: center;
  margin-top: 24px;
}

.loop-caption p {
  margin: 0 0 14px;
}

.loop-caption-muted {
  color: var(--text-muted) !important;
  font-size: 0.95rem !important;
}

.loop-diagram {
  position: relative;
  width: 520px;
  height: 520px;
  margin: 0 auto;
  justify-self: center;
}

.loop-ring {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  overflow: visible;
  transform: rotate(-90deg); /* start at top (12 o'clock) */
}

.loop-ring-trace {
  /* circumference = 2π × 200 ≈ 1256.64 */
  stroke-dasharray: 180 1077;
  filter: drop-shadow(0 0 8px rgba(43, 226, 102, 0.55));
  animation: loop-trace-travel 10s linear infinite;
}

@keyframes loop-trace-travel {
  from { stroke-dashoffset: 0; }
  to   { stroke-dashoffset: -1256.64; }
}

/* — Central "engine" of the loop — */
.loop-center {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 180px;
  transform: translate(-50%, -50%);
  text-align: center;
  pointer-events: none;
}

.loop-center-icon {
  font-size: 64px;
  line-height: 1;
  filter: drop-shadow(0 0 22px var(--brand-glow)) drop-shadow(0 4px 8px rgba(0, 0, 0, 0.4));
  animation: loop-center-bob 3.4s ease-in-out infinite;
}

@keyframes loop-center-bob {
  0%, 100% { transform: translateY(0) rotate(-4deg); }
  50%      { transform: translateY(-6px) rotate(4deg); }
}

.loop-center-label {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin: 12px 0 0;
  line-height: 1.5;
}

.loop-center-label span {
  color: var(--sun);
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.02em;
  text-transform: none;
}

/* — Nodes positioned via --x / --y (trig precomputed) — */
.loop-node {
  position: absolute;
  width: 148px;
  padding: 14px 12px 12px;
  top: 50%;
  left: 50%;
  margin: -50px 0 0 -74px; /* center the node (half height approx, half width) */
  transform: translate(var(--x), var(--y));
  background: var(--bg-panel);
  border: 2px solid var(--hairline);
  border-radius: var(--radius-md);
  text-align: center;
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.3);
  animation: loop-node-pulse 10s cubic-bezier(0.4, 0, 0.2, 1) infinite;
}

/* Stagger: node i lights up during seconds (i × 2) .. (i × 2 + 1.8) */
.loop-node:nth-child(3)  { animation-delay: 0s;  } /* node 1 (first .loop-node after svg + center) */
.loop-node:nth-child(4)  { animation-delay: -8s; } /* node 2 → active at real time 2-3.8s */
.loop-node:nth-child(5)  { animation-delay: -6s; } /* node 3 → active at 4-5.8s */
.loop-node:nth-child(6)  { animation-delay: -4s; } /* node 4 → active at 6-7.8s */
.loop-node:nth-child(7)  { animation-delay: -2s; } /* node 5 → active at 8-9.8s */

@keyframes loop-node-pulse {
  0%, 18% {
    border-color: var(--brand);
    background: var(--bg-elevated);
    box-shadow:
      0 0 0 3px var(--brand-glow),
      0 0 28px rgba(43, 226, 102, 0.35),
      0 12px 32px rgba(0, 0, 0, 0.4);
  }
  25%, 100% {
    border-color: var(--hairline);
    background: var(--bg-panel);
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.3);
  }
}

.loop-node-num {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--bg-deep);
  border: 2px solid var(--sunset-2);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  color: var(--sunset-3);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.4s ease;
  animation: loop-num-pulse 10s cubic-bezier(0.4, 0, 0.2, 1) infinite;
}

.loop-node:nth-child(3) .loop-node-num { animation-delay: 0s;  }
.loop-node:nth-child(4) .loop-node-num { animation-delay: -8s; }
.loop-node:nth-child(5) .loop-node-num { animation-delay: -6s; }
.loop-node:nth-child(6) .loop-node-num { animation-delay: -4s; }
.loop-node:nth-child(7) .loop-node-num { animation-delay: -2s; }

@keyframes loop-num-pulse {
  0%, 18% {
    background: var(--brand);
    border-color: var(--brand);
    color: var(--text-on-brand);
    box-shadow: 0 0 12px var(--brand-glow);
    transform: translateX(-50%) scale(1.15);
  }
  25%, 100% {
    background: var(--bg-deep);
    border-color: var(--sunset-2);
    color: var(--sunset-3);
    box-shadow: none;
    transform: translateX(-50%) scale(1);
  }
}

.loop-node-icon {
  font-size: 30px;
  margin: 0 0 6px;
  line-height: 1;
  filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.4));
}

.loop-node-label {
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 600;
  color: var(--text-primary);
  margin: 0;
  line-height: 1.2;
}

.loop-node-detail {
  font-family: var(--font-mono);
  font-size: 9px;
  color: var(--text-muted);
  letter-spacing: 0.05em;
  margin: 4px 0 0;
  line-height: 1.3;
}

/* — Reduce motion — */
@media (prefers-reduced-motion: reduce) {
  .loop-ring-trace,
  .loop-node,
  .loop-node-num,
  .loop-center-icon {
    animation: none;
  }
}

/* — Responsive: shrink circle on narrow viewports — */
@media (max-width: 1280px) {
  .loop-layout {
    grid-template-columns: 1fr;
    gap: 24px;
  }
  .loop-diagram {
    width: 440px;
    height: 440px;
  }
  .loop-ring {
    transform: rotate(-90deg) scale(0.846);
  }
  .loop-node {
    transform: translate(calc(var(--x) * 0.846), calc(var(--y) * 0.846)) scale(0.9);
  }
}

/* =========================================================================
   DEMO VIDEO (slide 18) — gameplay autoplay loop
   ========================================================================= */

.demo-video-wrap {
  width: 100%;
  max-width: 1320px;
  margin: 8px auto 0;
  display: flex;
  flex-direction: column;
  gap: 14px;
  align-items: center;
}

.demo-video {
  width: 100%;
  aspect-ratio: 16 / 9;
  border-radius: var(--radius-md);
  border: 2px solid var(--brand);
  background: #000;
  box-shadow:
    0 0 0 4px var(--brand-glow),
    0 24px 64px rgba(0, 0, 0, 0.55);
  display: block;
  object-fit: contain;
}

.demo-video-actions {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
  justify-content: center;
  margin-top: 4px;
}

/* =========================================================================
   DEMO LAUNCHER (slide 18) — legacy, retained for the (now unused) iframe
   ========================================================================= */

.demo-launcher {
  width: 100%;
  max-width: 1200px;
  margin: 28px auto 0;
}

.demo-launcher-inner {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 36px;
  align-items: stretch;
  padding: 32px;
  background: var(--bg-panel);
  border: 1px solid var(--brand);
  border-radius: var(--radius-lg);
  box-shadow:
    0 0 0 4px var(--brand-glow),
    0 24px 60px rgba(0, 0, 0, 0.6);
  overflow: hidden;
  position: relative;
}

.demo-launcher-art {
  position: relative;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, var(--sky-high) 0%, var(--sky-low) 50%, var(--sky-glow) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  min-height: 280px;
}

.demo-sun {
  position: absolute;
  width: 280px;
  height: 280px;
  border-radius: 50%;
  background: radial-gradient(circle, var(--sun) 0%, var(--sky-horizon) 50%, transparent 75%);
  filter: blur(8px);
  opacity: 0.85;
  top: 10%;
  right: -40px;
}

.demo-bike {
  position: relative;
  font-size: 96px;
  filter: drop-shadow(0 0 20px rgba(0, 0, 0, 0.4));
  z-index: 2;
}

.demo-launcher-content {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 16px;
}

.itch-frame {
  width: 100%;
  max-width: 1200px;
  aspect-ratio: 16 / 9;
  border: 2px solid var(--brand);
  border-radius: var(--radius-md);
  background: var(--bg-panel);
  box-shadow:
    0 0 0 4px var(--brand-glow),
    0 24px 60px rgba(0, 0, 0, 0.6);
  display: block;
  margin: 24px auto 0;
  transition: opacity 0.4s ease, max-height 0.4s ease;
}

.itch-frame.is-hidden {
  display: none;
}

.itch-actions {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-top: 16px;
  flex-wrap: wrap;
}

/* =========================================================================
   QR GRID (slide 24)
   ========================================================================= */

.qr-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  margin: 32px 0;
  max-width: 800px;
}

.qr-card {
  background: var(--bg-panel);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-md);
  padding: 20px;
  text-align: center;
}

.qr-card .qr-img {
  width: 160px;
  height: 160px;
  background: white;
  border-radius: var(--radius-sm);
  margin: 0 auto 12px;
  display: block;
  padding: 6px;
  box-sizing: border-box;
  object-fit: contain;
  image-rendering: pixelated;
}

.qr-card .qr-label {
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 600;
  color: var(--sun);
  margin: 0 0 4px;
}

.qr-card .qr-detail {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text-muted);
  letter-spacing: 0.06em;
}

/* =========================================================================
   COVER SLIDE (slide 1)
   ========================================================================= */

.cover {
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
}

.cover-meta {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--sunset-3);
  display: flex;
  gap: 24px;
}

.cover-meta span {
  display: flex;
  align-items: center;
  gap: 8px;
}

.cover-title {
  font-family: var(--font-display);
  font-size: clamp(4rem, 10vw, 9rem);
  font-weight: 700;
  font-variation-settings: 'opsz' 96;
  letter-spacing: -0.045em;
  line-height: 0.95;
  color: var(--text-primary);
  margin: 0;
}

.cover-title em {
  font-family: var(--font-serif);
  font-style: italic;
  font-variation-settings: 'opsz' 144, 'SOFT' 100;
  font-weight: 400;
  color: var(--sun);
}

.cover-subtitle {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: clamp(1.2rem, 2vw, 1.6rem);
  color: var(--text-secondary);
  font-variation-settings: 'opsz' 144, 'SOFT' 50;
  margin: 16px 0 0;
  max-width: 50ch;
}

.cover-byline {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--text-secondary);
}

.cover-byline strong {
  display: block;
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: -0.005em;
  margin-bottom: 4px;
  text-transform: none;
}

/* — Cover gameplay video — right-side decorative panel, not full bleed — */
.cover-video {
  position: absolute;
  top: 50%;
  right: 56px;
  width: 42%;
  max-width: 720px;
  aspect-ratio: 16 / 9;
  transform: translateY(-50%);
  object-fit: cover;
  border-radius: 14px;
  opacity: 0.5;
  filter: saturate(1.05) contrast(1.02);
  mix-blend-mode: screen;
  z-index: 0;
  pointer-events: none;
  box-shadow: 0 24px 64px rgba(0, 0, 0, 0.5);
}

/* Overlay no longer used — the video is small enough that text is unaffected */
.cover-video-overlay { display: none; }

/* — Cover slide layout: stretch .cover to fill so meta/title/byline space out — */
.reveal .slides section:has(> .cover-video) {
  justify-content: stretch;
}

.reveal .slides section:has(> .cover-video) .cover {
  flex: 1;
  height: auto;
  min-height: 0;
}

/* Reduce the sun and concentrate its glow upper-right (away from the byline) */
.reveal .slides section:has(> .cover-video) .cover-sun {
  opacity: 0.4;
  width: 480px;
  height: 480px;
  top: 35%;
  right: -40px;
}

/* Just text-shadow on the byline for legibility against any background */
.reveal .slides section:has(> .cover-video) .cover-byline,
.reveal .slides section:has(> .cover-video) .cover-byline strong {
  position: relative;
  z-index: 2;
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.85), 0 0 20px rgba(0, 0, 0, 0.5);
}

/* — Cover SUN ornament — vivid, glowing like the in-game sunset — */
.cover-sun {
  position: absolute;
  right: -80px;
  top: 50%;
  transform: translateY(-50%);
  width: 620px;
  height: 620px;
  border-radius: 50%;
  background: radial-gradient(
    circle at 50% 50%,
    #FFE7B3 0%,
    var(--sun) 12%,
    var(--sky-horizon) 28%,
    var(--sky-low) 48%,
    rgba(181, 57, 90, 0.35) 65%,
    transparent 78%
  );
  filter: blur(8px);
  opacity: 0.95;
  z-index: 0;
  pointer-events: none;
  animation: sun-breathe 7s ease-in-out infinite;
}

/* — Secondary sun halo — wider, softer — */
.cover-sun::after {
  content: "";
  position: absolute;
  inset: -120px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 139, 71, 0.45) 0%, transparent 60%);
  filter: blur(40px);
  animation: halo-pulse 7s ease-in-out infinite;
}

@keyframes sun-breathe {
  0%, 100% { transform: translateY(-50%) scale(1); opacity: 0.95; }
  50% { transform: translateY(-50%) scale(1.06); opacity: 1; }
}

@keyframes halo-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.7; }
}

.cover * {
  position: relative;
  z-index: 1;
}

/* =========================================================================
   FRAGMENT REVEAL HELPERS
   ========================================================================= */

.stagger > * {
  opacity: 0;
  transform: translateY(12px);
  animation: stagger-in 0.6s cubic-bezier(0.22, 1, 0.36, 1) forwards;
}

.stagger > *:nth-child(1) { animation-delay: 0.05s; }
.stagger > *:nth-child(2) { animation-delay: 0.15s; }
.stagger > *:nth-child(3) { animation-delay: 0.25s; }
.stagger > *:nth-child(4) { animation-delay: 0.35s; }
.stagger > *:nth-child(5) { animation-delay: 0.45s; }
.stagger > *:nth-child(6) { animation-delay: 0.55s; }
.stagger > *:nth-child(7) { animation-delay: 0.65s; }
.stagger > *:nth-child(8) { animation-delay: 0.75s; }

@keyframes stagger-in {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* — Reset stagger on inactive slides so it replays — */
.reveal .slides section:not(.present) .stagger > * {
  animation: none;
  opacity: 0;
  transform: translateY(12px);
}