:root {
  --bg-top: #fffaf7;
  --bg-bottom: #f6ebe8;
  --panel: rgba(255, 255, 255, 0.64);
  --panel-strong: rgba(255, 251, 252, 0.84);
  --panel-soft: rgba(255, 244, 247, 0.72);
  --line: rgba(143, 90, 114, 0.12);
  --line-strong: rgba(143, 90, 114, 0.24);
  --text: #30222b;
  --muted: rgba(76, 58, 68, 0.68);
  --accent-solid: #d782a0;
  --accent-soft: rgba(215, 130, 160, 0.14);
  --accent-glow: rgba(215, 130, 160, 0.24);
  --accent-rgb: 215, 130, 160;
  --shadow-xl: 0 28px 90px rgba(150, 106, 123, 0.14);
  --shadow-card: 0 24px 60px rgba(144, 100, 117, 0.16);
  --shadow-soft: 0 12px 30px rgba(156, 114, 130, 0.1);
  --serif: "Instrument Serif", serif;
  --sans: "Manrope", sans-serif;
  --script: "Caveat", cursive;
}

* {
  box-sizing: border-box;
}

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

body {
  overflow: hidden;
  background:
    radial-gradient(circle at 14% 14%, rgba(255, 255, 255, 0.96), transparent 28%),
    radial-gradient(circle at 82% 18%, rgba(247, 205, 217, 0.52), transparent 28%),
    radial-gradient(circle at 50% 100%, rgba(244, 210, 186, 0.42), transparent 38%),
    linear-gradient(180deg, var(--bg-top) 0%, var(--bg-bottom) 100%);
  color: var(--text);
  font-family: var(--sans);
}

button {
  border: none;
  border-radius: 999px;
  font: 700 0.82rem/1 var(--sans);
  letter-spacing: 0.02em;
  cursor: pointer;
  transition:
    transform 180ms ease,
    box-shadow 180ms ease,
    background 180ms ease,
    border-color 180ms ease,
    opacity 180ms ease;
}

button:focus-visible,
.flash-card:focus-visible,
.overview-item:focus-visible,
.rail-button:focus-visible {
  outline: 2px solid rgba(var(--accent-rgb), 0.5);
  outline-offset: 3px;
}

code {
  font-family: ui-monospace, "SFMono-Regular", "SF Mono", monospace;
  font-size: 0.95em;
}

.app-shell {
  position: relative;
  width: 100%;
  height: 100dvh;
  overflow: hidden;
  isolation: isolate;
}

#stage,
.gradient-veil {
  position: absolute;
  inset: 0;
}

#stage {
  width: 100%;
  height: 100%;
  display: block;
  opacity: 0.34;
  filter: saturate(0.72) blur(10px);
  transform: scale(1.03);
}

.gradient-veil {
  pointer-events: none;
  background:
    radial-gradient(circle at 20% 18%, rgba(255, 255, 255, 0.8), transparent 26%),
    radial-gradient(circle at 78% 14%, rgba(var(--accent-rgb), 0.1), transparent 28%),
    linear-gradient(180deg, rgba(255, 252, 251, 0.12), rgba(255, 245, 247, 0.5));
}

.chapter-rail {
  display: none;
}

.rail-brand h1 {
  margin: 0;
  font: 400 2rem/1 var(--serif);
}

.rail-kicker,
.overview-kicker,
.intro-kicker,
.eyebrow {
  margin: 0;
  color: var(--muted);
  font: 700 0.72rem/1.2 var(--sans);
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.presentation-shell {
  position: absolute;
  inset: 0.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  z-index: 3;
}

.deck-header,
.board-frame,
.overview-panel,
.intro-card,
.focus-card {
  border: 1px solid rgba(255, 255, 255, 0.62);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.86), rgba(255, 248, 249, 0.68)),
    rgba(255, 255, 255, 0.58);
  backdrop-filter: blur(28px);
  box-shadow: var(--shadow-xl);
}

.deck-header {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 1.5rem;
  align-items: end;
  padding: 1.1rem 1.3rem;
  border-radius: 1.7rem;
}

.deck-title-group h2 {
  margin: 0.18rem 0 0.55rem;
  font: 400 clamp(2.6rem, 5vw, 4.8rem)/0.92 var(--serif);
  letter-spacing: -0.04em;
  color: #2c1f28;
}

.chapter-summary {
  max-width: 42rem;
  margin: 0;
  color: var(--muted);
  font-size: 1rem;
  line-height: 1.65;
}

.deck-meta {
  display: grid;
  gap: 0.85rem;
  justify-items: end;
}

.deck-toolbar {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 0.55rem;
}

.deck-toolbar button {
  padding: 0.82rem 1.05rem;
}

.deck-hint,
.assist-copy,
.intro-hint {
  margin: 0;
  color: var(--muted);
  font-size: 0.86rem;
  line-height: 1.5;
}

.ghost-btn {
  color: #563845;
  background: rgba(255, 255, 255, 0.7);
  border: 1px solid rgba(255, 255, 255, 0.72);
  box-shadow: var(--shadow-soft);
}

.ghost-btn:hover,
.deck-controls button:hover,
.intro-actions button:hover {
  transform: translateY(-2px);
}

.board-shell {
  flex: 1;
  min-height: 0;
}

.board-frame {
  position: relative;
  height: 100%;
  min-height: 34rem;
  border-radius: 2.6rem;
  overflow: hidden;
}

.board-frame::before {
  content: "";
  position: absolute;
  inset: -12%;
  background:
    radial-gradient(circle at 20% 24%, rgba(255, 255, 255, 0.82), transparent 22%),
    radial-gradient(circle at 80% 18%, rgba(var(--accent-rgb), 0.16), transparent 20%),
    radial-gradient(circle at 76% 84%, rgba(239, 198, 150, 0.22), transparent 24%);
  animation: board-drift 18s ease-in-out infinite alternate;
  pointer-events: none;
}

.board-topline {
  position: absolute;
  left: 1rem;
  right: 1rem;
  top: 1rem;
  z-index: 3;
  display: flex;
  justify-content: space-between;
  gap: 0.8rem;
  pointer-events: none;
}

.board-topline span {
  padding: 0.52rem 0.82rem;
  border: 1px solid rgba(255, 255, 255, 0.64);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.62);
  color: #614350;
  font: 700 0.72rem/1 var(--sans);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  box-shadow: var(--shadow-soft);
}

.accent-chip {
  color: #9b5572;
  background: rgba(255, 241, 245, 0.92);
}

.deck-board {
  position: relative;
  width: 100%;
  height: 100%;
  overflow: hidden;
  border-radius: 2.6rem;
  background:
    radial-gradient(circle at 14% 18%, rgba(255, 255, 255, 0.4), transparent 22%),
    linear-gradient(145deg, rgba(var(--accent-rgb), 0.16), rgba(255, 255, 255, 0.08) 36%, rgba(244, 213, 195, 0.16)),
    linear-gradient(160deg, rgba(255, 247, 249, 0.74), rgba(244, 233, 229, 0.56));
}

.deck-board::before,
.deck-board::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.deck-board::before {
  background:
    radial-gradient(circle at 18% 20%, rgba(255, 255, 255, 0.84), transparent 24%),
    radial-gradient(circle at 82% 16%, rgba(var(--accent-rgb), 0.12), transparent 24%),
    radial-gradient(circle at 74% 84%, rgba(239, 198, 150, 0.16), transparent 28%);
  animation: board-drift 20s ease-in-out infinite alternate-reverse;
}

.deck-board::after {
  border: 1px solid rgba(255, 255, 255, 0.62);
  border-radius: 2.6rem;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.52);
}

.flash-card {
  position: absolute;
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(18rem, 0.95fr);
  gap: clamp(1.2rem, 3vw, 2.4rem);
  align-items: stretch;
  padding: clamp(1.35rem, 3vw, 2.7rem);
  border-radius: 2.4rem;
  border: 1px solid rgba(255, 255, 255, 0.76);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.32), rgba(255, 248, 249, 0.14)),
    linear-gradient(145deg, rgba(255, 252, 253, 0.84), rgba(255, 242, 245, 0.42)),
    rgba(255, 255, 255, 0.52);
  color: var(--text);
  box-shadow: 0 30px 90px rgba(126, 84, 102, 0.18);
  backdrop-filter: blur(26px);
  transform: translate(-50%, -50%) scale(1);
  transform-origin: center;
  transition:
    left 260ms cubic-bezier(0.2, 0.9, 0.22, 1),
    top 260ms cubic-bezier(0.2, 0.9, 0.22, 1),
    transform 260ms cubic-bezier(0.2, 0.9, 0.22, 1),
    box-shadow 260ms ease,
    border-color 260ms ease,
    opacity 260ms ease,
    filter 260ms ease;
  cursor: pointer;
  overflow: hidden;
}

.flash-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 10% 12%, rgba(255, 255, 255, 0.95), transparent 18%),
    linear-gradient(120deg, rgba(var(--accent-rgb), 0.12), transparent 42%, rgba(239, 198, 150, 0.12));
  opacity: 0.88;
  pointer-events: none;
}

.flash-card::after {
  content: "";
  position: absolute;
  right: -8%;
  bottom: -18%;
  width: 22rem;
  height: 22rem;
  background: radial-gradient(circle at center, rgba(var(--accent-rgb), 0.18), transparent 66%);
  filter: blur(12px);
  pointer-events: none;
}

.flash-card[data-motion="orbit"]::before {
  background:
    radial-gradient(circle at 14% 12%, rgba(255, 255, 255, 0.95), transparent 20%),
    linear-gradient(115deg, rgba(223, 168, 186, 0.22), transparent 45%, rgba(255, 255, 255, 0.1));
}

.flash-card[data-motion="ribbon"]::before {
  background:
    linear-gradient(135deg, rgba(255, 225, 232, 0.78), transparent 42%),
    radial-gradient(circle at 84% 18%, rgba(239, 198, 150, 0.2), transparent 22%);
}

.flash-card[data-motion="memory"]::before {
  background:
    radial-gradient(circle at 74% 24%, rgba(239, 198, 150, 0.24), transparent 28%),
    linear-gradient(145deg, rgba(255, 255, 255, 0.8), transparent 36%, rgba(215, 130, 160, 0.12));
}

.flash-card.is-active,
.flash-card:hover {
  transform: translate(-50%, -50%) translateY(-4px) scale(1.008);
  border-color: rgba(255, 255, 255, 0.86);
  box-shadow: 0 36px 96px rgba(150, 106, 123, 0.22);
}

.flash-card.is-dimmed {
  opacity: 0.22;
  filter: saturate(0.8);
}

.flash-card.no-transition {
  transition: none;
}

.stage-card {
  cursor: pointer;
}

.flash-card.slide-enter,
.flash-card.slide-enter-forward,
.flash-card.slide-enter-backward {
  animation-duration: 720ms;
  animation-fill-mode: backwards;
  animation-timing-function: cubic-bezier(0.18, 0.92, 0.2, 1);
}

.flash-card.slide-enter {
  animation-name: slide-enter;
}

.flash-card.slide-enter-forward {
  animation-name: slide-enter-forward;
}

.flash-card.slide-enter-backward {
  animation-name: slide-enter-backward;
}

@keyframes board-drift {
  from {
    transform: translate3d(-1.5%, -1.5%, 0) scale(1);
  }

  to {
    transform: translate3d(1.5%, 1.5%, 0) scale(1.06);
  }
}

@keyframes slide-enter {
  from {
    opacity: 0;
    transform: translate(-50%, calc(-50% + 28px)) scale(0.985);
    filter: blur(6px);
  }

  to {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1);
    filter: blur(0);
  }
}

@keyframes slide-enter-forward {
  from {
    opacity: 0;
    transform: translate(calc(-50% + 84px), -50%) scale(0.985);
    filter: blur(8px);
  }

  to {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1);
    filter: blur(0);
  }
}

@keyframes slide-enter-backward {
  from {
    opacity: 0;
    transform: translate(calc(-50% - 84px), -50%) scale(0.985);
    filter: blur(8px);
  }

  to {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1);
    filter: blur(0);
  }
}

.card-header,
.card-footer {
  position: relative;
  z-index: 1;
  display: flex;
  justify-content: flex-start;
  gap: 0.75rem;
  align-items: center;
  flex-wrap: wrap;
}

.card-index,
.card-hint {
  padding: 0.45rem 0.72rem;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.68);
  background: rgba(255, 255, 255, 0.6);
  color: rgba(87, 60, 73, 0.78);
  font: 700 0.68rem/1 var(--sans);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.card-title {
  position: relative;
  z-index: 1;
  margin: 0;
  max-width: 12ch;
  font: 400 clamp(3rem, 6vw, 5.8rem)/0.9 var(--serif);
  letter-spacing: -0.04em;
  color: #2f2028;
}

.card-body {
  position: relative;
  z-index: 1;
  max-width: 34rem;
  margin: 0;
  color: rgba(58, 42, 50, 0.84);
  font-size: clamp(1.02rem, 1.45vw, 1.18rem);
  line-height: 1.78;
}

.card-body strong {
  color: #8f4d68;
}

.scene-copy,
.scene-visual {
  position: relative;
  z-index: 1;
}

.scene-copy {
  display: grid;
  align-content: center;
  gap: 1rem;
  min-height: 0;
}

.scene-copy > * {
  animation: copy-rise 780ms cubic-bezier(0.18, 0.92, 0.2, 1) backwards;
}

.scene-copy > :nth-child(1) {
  animation-delay: 40ms;
}

.scene-copy > :nth-child(2) {
  animation-delay: 100ms;
}

.scene-copy > :nth-child(3) {
  animation-delay: 160ms;
}

.scene-copy > :nth-child(4) {
  animation-delay: 220ms;
}

.scene-copy > :nth-child(5),
.scene-copy > :nth-child(6) {
  animation-delay: 280ms;
}

.scene-backdrop {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.scene-backdrop::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(255, 255, 255, 0.08) 1px, transparent 1px),
    linear-gradient(0deg, rgba(255, 255, 255, 0.08) 1px, transparent 1px);
  background-size: 4rem 4rem;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.16), transparent 68%);
  opacity: 0.42;
}

.scene-orb {
  position: absolute;
  border-radius: 999px;
  filter: blur(6px);
  background: radial-gradient(circle at 30% 30%, rgba(255, 255, 255, 0.92), rgba(var(--accent-rgb), 0.18) 52%, transparent 72%);
  animation: scene-float 14s ease-in-out infinite alternate;
}

.scene-orb-a {
  top: 6%;
  left: 5%;
  width: 14rem;
  height: 14rem;
}

.scene-orb-b {
  right: 10%;
  bottom: 12%;
  width: 18rem;
  height: 18rem;
  animation-duration: 18s;
}

.scene-orb-c {
  top: 44%;
  right: 36%;
  width: 7rem;
  height: 7rem;
  opacity: 0.78;
  animation-duration: 11s;
}

.scene-kicker,
.scene-visual-label {
  margin: 0;
  color: rgba(109, 73, 88, 0.74);
  font: 700 0.76rem/1.2 var(--sans);
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.scene-summary {
  max-width: 36rem;
  margin: 0;
  color: rgba(78, 56, 66, 0.72);
  font-size: 0.98rem;
  line-height: 1.65;
}

.card-media {
  position: relative;
  z-index: 1;
  border-radius: 1.5rem;
  overflow: hidden;
  min-height: 13rem;
  border: 1px solid rgba(255, 255, 255, 0.7);
  background:
    linear-gradient(160deg, rgba(255, 232, 238, 0.9), rgba(247, 224, 212, 0.82)),
    rgba(255, 255, 255, 0.82);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.72);
}

.card-media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.scene-visual {
  min-width: 0;
}

.scene-visual-frame {
  position: relative;
  display: grid;
  align-content: end;
  gap: 1rem;
  height: 100%;
  min-height: 100%;
  padding: 1.35rem;
  border-radius: 2rem;
  overflow: hidden;
  background:
    linear-gradient(180deg, rgba(74, 43, 57, 0.16), rgba(52, 30, 40, 0.28)),
    linear-gradient(145deg, rgba(var(--accent-rgb), 0.28), rgba(255, 255, 255, 0.08));
  border: 1px solid rgba(255, 255, 255, 0.44);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.22);
}

.scene-visual-art {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.scene-ring,
.scene-spark {
  position: absolute;
  border-radius: 999px;
}

.scene-ring {
  border: 1px solid rgba(255, 255, 255, 0.28);
  animation: ring-drift 16s ease-in-out infinite alternate;
}

.scene-ring-a {
  inset: 10% 14% auto auto;
  width: 16rem;
  height: 16rem;
}

.scene-ring-b {
  inset: auto auto 8% 6%;
  width: 12rem;
  height: 12rem;
  animation-duration: 12s;
}

.scene-spark {
  background: radial-gradient(circle at center, rgba(255, 255, 255, 0.95), rgba(var(--accent-rgb), 0.42) 52%, transparent 72%);
  filter: blur(1px);
  animation: scene-glimmer 9s ease-in-out infinite alternate;
}

.scene-spark-a {
  top: 18%;
  right: 20%;
  width: 1rem;
  height: 1rem;
}

.scene-spark-b {
  bottom: 20%;
  left: 18%;
  width: 1.4rem;
  height: 1.4rem;
  animation-duration: 12s;
}

.scene-visual-frame .card-media {
  position: absolute;
  inset: 0;
  min-height: 0;
  height: auto;
  border: none;
  border-radius: 0;
  background: transparent;
  box-shadow: none;
}

.scene-visual-frame .card-media img {
  filter: saturate(0.9) contrast(1.02);
}

.scene-visual-frame .media-placeholder {
  min-height: 100%;
  padding: 2rem;
  background:
    radial-gradient(circle at 20% 20%, rgba(255, 255, 255, 0.12), transparent 22%),
    linear-gradient(180deg, rgba(72, 44, 56, 0.5), rgba(53, 32, 41, 0.72));
  color: rgba(255, 246, 249, 0.88);
}

.scene-visual-frame.has-media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(25, 12, 16, 0.04), rgba(44, 24, 32, 0.44));
  pointer-events: none;
}

.scene-visual-panel,
.scene-visual-quote,
.scene-visual-count {
  position: relative;
  z-index: 1;
}

.scene-visual-panel {
  width: min(100%, 22rem);
  padding: 1rem 1.05rem;
  border-radius: 1.4rem;
  background: rgba(255, 248, 250, 0.72);
  border: 1px solid rgba(255, 255, 255, 0.34);
  backdrop-filter: blur(12px);
  box-shadow: 0 18px 40px rgba(40, 18, 28, 0.16);
}

.scene-visual-panel h4,
.scene-visual-panel p {
  margin: 0;
}

.scene-visual-panel h4 {
  margin-top: 0.35rem;
  font: 400 clamp(1.6rem, 2.4vw, 2.2rem)/0.98 var(--serif);
  letter-spacing: -0.03em;
  color: #2f2028;
}

.scene-visual-panel p:last-child {
  margin-top: 0.55rem;
  color: rgba(64, 45, 53, 0.74);
  font-size: 0.92rem;
  line-height: 1.55;
}

.scene-visual-quote {
  max-width: 15ch;
  margin: 0;
  color: #fff7fb;
  font: 400 clamp(1.8rem, 3vw, 2.8rem)/0.98 var(--serif);
  letter-spacing: -0.04em;
  text-shadow: 0 12px 32px rgba(30, 14, 21, 0.24);
}

.scene-visual-count {
  position: absolute;
  right: 1.2rem;
  top: 0.85rem;
  color: rgba(255, 255, 255, 0.22);
  font: 400 clamp(4.4rem, 8vw, 7rem)/1 var(--serif);
  letter-spacing: -0.05em;
}

@keyframes copy-rise {
  from {
    opacity: 0;
    transform: translateY(18px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes scene-float {
  from {
    transform: translate3d(-12px, -10px, 0) scale(0.98);
  }

  to {
    transform: translate3d(18px, 14px, 0) scale(1.06);
  }
}

@keyframes ring-drift {
  from {
    transform: translate3d(0, 0, 0) rotate(0deg);
  }

  to {
    transform: translate3d(10px, -12px, 0) rotate(12deg);
  }
}

@keyframes scene-glimmer {
  from {
    opacity: 0.45;
    transform: scale(0.88);
  }

  to {
    opacity: 1;
    transform: scale(1.24);
  }
}

.media-placeholder {
  display: grid;
  place-items: center;
  min-height: 100%;
  padding: 1.2rem;
  color: rgba(94, 69, 80, 0.72);
  text-align: center;
  font-size: 0.92rem;
  line-height: 1.55;
}

.deck-footer {
  display: flex;
  justify-content: space-between;
  gap: 1.1rem;
  align-items: center;
}

.deck-progress {
  flex: 1;
}

.progress-track {
  height: 0.66rem;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.6);
  background: rgba(255, 255, 255, 0.45);
  box-shadow: inset 0 1px 4px rgba(176, 126, 146, 0.08);
  overflow: hidden;
}

.progress-fill {
  width: 12.5%;
  height: 100%;
  background: linear-gradient(90deg, rgba(215, 130, 160, 0.9), rgba(239, 198, 150, 0.92));
  box-shadow: 0 0 18px rgba(215, 130, 160, 0.24);
}

.deck-controls {
  display: flex;
  align-items: stretch;
  gap: 0.75rem;
  width: min(100%, 22rem);
}

.deck-controls button,
.intro-actions button {
  padding: 0.86rem 1.05rem;
}

.deck-controls button,
.intro-actions button:first-child {
  color: #fff7fa;
  background: linear-gradient(135deg, #e8a2b8, #d47a99);
  box-shadow: 0 16px 34px rgba(215, 130, 160, 0.22);
}

.deck-controls button {
  flex: 1 1 0;
  min-width: 0;
}

.deck-controls button[disabled] {
  opacity: 0.42;
  cursor: default;
  transform: none;
}

.overview-panel {
  position: absolute;
  right: 1rem;
  top: 1rem;
  bottom: 1rem;
  width: min(26rem, calc(100vw - 2rem));
  padding: 1.1rem;
  border-radius: 2rem;
  transform: translateX(calc(100% + 1.2rem));
  transition: transform 260ms ease;
  z-index: 17;
  overflow: auto;
}

.overview-panel.show {
  transform: translateX(0);
}

.overview-header {
  display: flex;
  justify-content: space-between;
  gap: 0.8rem;
  align-items: center;
  margin-bottom: 1rem;
}

.overview-header h2,
.intro-card h2 {
  margin: 0.24rem 0 0;
  font: 400 clamp(2rem, 4vw, 3.4rem)/0.94 var(--serif);
  letter-spacing: -0.04em;
  color: #2e1f28;
}

.overview-grid {
  display: grid;
  gap: 0.8rem;
}

.overview-item {
  width: 100%;
  padding: 1.1rem;
  border-radius: 1.5rem;
  border: 1px solid rgba(255, 255, 255, 0.72);
  background: rgba(255, 255, 255, 0.58);
  color: var(--text);
  text-align: left;
  box-shadow: var(--shadow-soft);
}

.overview-item:hover,
.overview-item.active {
  transform: translateY(-2px);
  border-color: rgba(255, 255, 255, 0.82);
  background: rgba(255, 250, 251, 0.88);
}

.overview-item p,
.overview-item h3 {
  margin: 0;
}

.overview-item h3 {
  margin-top: 0.32rem;
  font: 400 1.55rem/1 var(--serif);
  letter-spacing: -0.03em;
  color: #34232d;
}

.overview-item .overview-copy {
  margin-top: 0.55rem;
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.55;
}

.focus-overlay {
  position: absolute;
  inset: 0;
  z-index: 20;
  display: grid;
  place-items: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity 220ms ease;
}

.focus-overlay.show {
  opacity: 1;
  visibility: visible;
}

.focus-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(252, 242, 246, 0.68);
  backdrop-filter: blur(18px);
}

.focus-card {
  position: relative;
  z-index: 1;
  width: min(48rem, calc(100vw - 2rem));
  max-height: min(88vh, 52rem);
  overflow: auto;
  padding: 1.5rem;
  border-radius: 2.2rem;
}

.focus-card-header {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: flex-start;
  margin-bottom: 1rem;
}

.focus-card-header h3 {
  margin: 0.24rem 0 0;
  font: 400 clamp(2rem, 4vw, 3.2rem)/0.95 var(--serif);
  letter-spacing: -0.04em;
  color: #2d2028;
}

.focus-card-copy {
  display: grid;
  gap: 0.95rem;
}

.focus-card-copy p {
  margin: 0;
  color: rgba(58, 42, 50, 0.84);
  line-height: 1.75;
}

.focus-media {
  margin: 1rem 0;
  border-radius: 1.6rem;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.72);
  min-height: 14rem;
}

.focus-media img {
  display: block;
  width: 100%;
  height: 100%;
  max-height: 24rem;
  object-fit: cover;
}

.focus-script {
  margin-top: 1rem;
  padding: 1rem 1.1rem;
  border-radius: 1.4rem;
  background: rgba(255, 243, 246, 0.74);
  border: 1px solid rgba(255, 255, 255, 0.68);
}

.focus-script p {
  margin: 0;
  color: rgba(132, 82, 102, 0.82);
  font: 700 1.1rem/1.5 var(--script);
  letter-spacing: 0.01em;
}

.intro-overlay {
  position: absolute;
  inset: 0;
  z-index: 16;
  display: grid;
  place-items: center;
  padding: 1rem;
  background:
    radial-gradient(circle at 76% 14%, rgba(var(--accent-rgb), 0.12), transparent 28%),
    radial-gradient(circle at 18% 88%, rgba(239, 198, 150, 0.18), transparent 30%),
    rgba(255, 247, 248, 0.72);
  opacity: 0;
  visibility: hidden;
  transition: opacity 240ms ease;
}

.intro-overlay.show {
  opacity: 1;
  visibility: visible;
}

.intro-card {
  width: min(64rem, 100%);
  padding: 1.65rem;
  border-radius: 2.3rem;
}

.intro-summary {
  max-width: 44rem;
  margin: 0.85rem 0 1rem;
  color: rgba(62, 46, 55, 0.8);
  font-size: 1.02rem;
  line-height: 1.7;
}

.intro-preview {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-bottom: 1rem;
}

.intro-preview span {
  padding: 0.55rem 0.82rem;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.7);
  background: rgba(255, 255, 255, 0.58);
  color: rgba(89, 62, 75, 0.82);
  font: 700 0.74rem/1 var(--sans);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.intro-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-bottom: 0.85rem;
}

.toast {
  position: absolute;
  left: 50%;
  top: 1.1rem;
  z-index: 18;
  padding: 0.64rem 0.95rem;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.72);
  background: rgba(255, 255, 255, 0.84);
  color: #7c4c62;
  font: 700 0.76rem/1 var(--sans);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  box-shadow: var(--shadow-soft);
  transform: translateX(-50%) translateY(-10px);
  opacity: 0;
  transition: opacity 180ms ease, transform 180ms ease;
}

.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

.app-shell.focus-open .flash-card {
  opacity: 0.16;
}

.app-shell.reduced-motion *,
.app-shell.reduced-motion *::before,
.app-shell.reduced-motion *::after {
  animation: none !important;
  transition-duration: 1ms !important;
  scroll-behavior: auto !important;
}

@media (max-width: 980px) {
  .deck-header,
  .deck-footer {
    grid-template-columns: 1fr;
    flex-direction: column;
    align-items: stretch;
  }

  .deck-meta {
    justify-items: start;
  }

  .deck-toolbar {
    justify-content: flex-start;
  }

  .flash-card {
    grid-template-columns: 1fr;
    grid-auto-rows: auto;
  }

  .scene-copy {
    align-content: start;
  }

  .scene-visual {
    min-height: 18rem;
  }

  .deck-controls {
    width: 100%;
  }
}

@media (max-width: 860px) {
  .overview-panel {
    left: 1rem;
    right: 1rem;
    top: auto;
    bottom: 1rem;
    width: auto;
    max-height: min(34rem, 68vh);
  }

  .focus-card {
    width: min(94vw, 42rem);
  }
}

@media (max-width: 720px) {
  body {
    font-size: 15px;
  }

  .presentation-shell {
    inset: 0.75rem;
    gap: 0.75rem;
  }

  .deck-header,
  .board-frame,
  .intro-card,
  .focus-card,
  .overview-panel {
    border-radius: 1.6rem;
  }

  .deck-header,
  .focus-card,
  .intro-card {
    padding: 1.05rem;
  }

  .deck-title-group h2,
  .intro-card h2,
  .focus-card-header h3 {
    font-size: clamp(2.2rem, 11vw, 3.6rem);
  }

  .board-frame {
    min-height: 26rem;
  }

  .board-topline {
    left: 0.75rem;
    right: 0.75rem;
    top: 0.75rem;
  }

  .board-topline span {
    font-size: 0.64rem;
    letter-spacing: 0.1em;
  }

  .card-title {
    max-width: none;
    font-size: clamp(2.4rem, 10vw, 3.4rem);
  }

  .scene-visual-frame {
    min-height: 17rem;
    padding: 1.1rem;
  }

  .scene-visual-panel {
    width: 100%;
  }

  .scene-visual-quote {
    font-size: clamp(1.45rem, 7vw, 2.1rem);
  }

  .deck-controls,
  .intro-actions {
    width: 100%;
  }

  .intro-actions button,
  .deck-controls button {
    flex: 1 1 10rem;
  }
}