:root {
  --arcade-bg: #f8f6ff;
  --arcade-surface: #ffffff;
  --arcade-surface-alt: #efe9ff;
  --arcade-border: rgba(78, 44, 255, 0.15);
  --arcade-primary: #4e2cff;
  --arcade-primary-strong: #3a1edb;
  --arcade-muted: #6f6c8a;
  --arcade-success: #28b47f;
  --arcade-error: #f35a7e;
  --arcade-radius-large: 32px;
  --arcade-radius-medium: 20px;
  --arcade-radius-small: 12px;
  --arcade-shadow: 0 25px 60px rgba(37, 12, 85, 0.15);
  --arcade-shadow-soft: 0 16px 36px rgba(31, 20, 66, 0.12);
}

body {
  background: var(--arcade-bg);
}

.page-section {
  margin-inline: auto;
  padding: clamp(1.5rem, 4vw, 3rem);
  max-width: min(1100px, 100%);
}

.arcade-simple {
  display: grid;
  gap: clamp(2rem, 5vw, 3rem);
}

.arcade-selector {
  display: grid;
  gap: clamp(1.5rem, 4vw, 2.5rem);
  overflow: hidden;
  max-height: 1200px;
  transition: opacity 280ms ease, transform 280ms ease, max-height 320ms ease;
}

.arcade-simple.is-playing .arcade-selector {
  opacity: 0;
  transform: translateY(-20px) scale(0.98);
  max-height: 0;
  pointer-events: none;
  margin-bottom: 0;
}

.arcade-header {
  background: linear-gradient(120deg, rgba(78, 44, 255, 0.16), rgba(255, 138, 92, 0.15));
  border-radius: var(--arcade-radius-large);
  padding: clamp(1.75rem, 5vw, 3rem);
  color: #1e163d;
  text-align: center;
  box-shadow: var(--arcade-shadow);
}

.arcade-header__eyebrow {
  margin: 0;
  text-transform: uppercase;
  letter-spacing: 0.4em;
  font-size: 0.82rem;
  color: var(--arcade-muted);
}

.arcade-header__title {
  margin: 0.5rem 0 0;
  font-size: clamp(2.4rem, 5vw, 3.4rem);
}

.arcade-carousel {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 1rem;
  align-items: center;
}

.arcade-carousel__control {
  border: 1px solid transparent;
  background: var(--arcade-surface);
  border-radius: 999px;
  width: 3rem;
  height: 3rem;
  font-size: 1.5rem;
  color: var(--arcade-primary);
  box-shadow: var(--arcade-shadow-soft);
  cursor: pointer;
  transition: transform 200ms ease, box-shadow 200ms ease;
}

.arcade-carousel__control:hover {
  transform: translateY(-1px);
  box-shadow: 0 18px 30px rgba(78, 44, 255, 0.2);
}

.arcade-carousel__viewport {
  display: flex;
  gap: 1.25rem;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  padding: 0.5rem;
  touch-action: pan-y;
  cursor: grab;
  user-select: none;
  -webkit-overflow-scrolling: touch;
}

.arcade-carousel__viewport::-webkit-scrollbar {
  display: none;
}

.arcade-carousel__viewport.is-dragging {
  cursor: grabbing;
}

.arcade-carousel__viewport.is-dragging .arcade-card {
  pointer-events: none;
}

.arcade-card {
  scroll-snap-align: center;
  min-width: clamp(260px, 65vw, 320px);
  border: 2px solid transparent;
  border-radius: var(--arcade-radius-medium);
  padding: 1.5rem;
  text-align: left;
  background: var(--arcade-surface);
  color: inherit;
  box-shadow: var(--arcade-shadow-soft);
  cursor: pointer;
  transition: transform 200ms ease, border-color 200ms ease, box-shadow 200ms ease;
}

.arcade-card.is-selected {
  border-color: var(--arcade-primary);
  box-shadow: 0 30px 50px rgba(78, 44, 255, 0.18);
  transform: translateY(-8px);
}

.arcade-card__icon {
  font-size: 2rem;
  display: inline-flex;
  width: 3rem;
  height: 3rem;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  background: var(--arcade-surface-alt);
  margin-bottom: 1rem;
}

.arcade-card__group {
  margin: 0;
  text-transform: uppercase;
  font-size: 0.9rem;
  letter-spacing: 0.2em;
  color: var(--arcade-muted);
}

.arcade-card__title {
  margin: 0.35rem 0 0;
  font-size: 1.25rem;
  font-weight: 700;
}

.arcade-card__tagline {
  margin: 0.3rem 0 0;
  color: var(--arcade-muted);
}

.arcade-card__meta {
  margin: 0.75rem 0 0;
  font-weight: 600;
  color: var(--arcade-primary-strong);
}

.arcade-actions {
  display: flex;
  justify-content: center;
}

.arcade-launch {
  min-width: min(220px, 100%);
  font-size: 1.05rem;
}

.quiz-stage {
  margin: 0;
}

.quiz-stage__container {
  background: var(--arcade-surface);
  border-radius: var(--arcade-radius-large);
  padding: clamp(1.5rem, 4vw, 2.5rem);
  box-shadow: var(--arcade-shadow-soft);
  border: 1px solid var(--arcade-border);
  display: grid;
  gap: 1.5rem;
}

.arcade-simple.is-playing .quiz-stage__container {
  animation: arcadeStageEnter 300ms ease forwards;
}

.quiz-stage__header {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
  font-weight: 600;
  color: var(--arcade-primary-strong);
}

.quiz-stage__body {
  min-height: 12rem;
  position: relative;
}

.quiz-stage__panes {
  position: relative;
  min-height: 12rem;
  overflow: hidden;
  display: grid;
}

.quiz-stage__pane {
  display: grid;
  gap: 1rem;
  transition: transform 360ms ease, opacity 360ms ease;
  min-height: 100%;
  grid-area: 1 / 1;
}

.quiz-stage__pane--question {
  position: relative;
  z-index: 2;
}

.quiz-stage__pane--question.quiz-stage__pane--answer {
  transform: translateX(-100%);
}

.quiz-stage__pane--answer {
  opacity: 0;
  pointer-events: none;
}

.quiz-stage__pane--answer:not(.quiz-stage__pane--question) {
  transform: translateX(100%);
}

.quiz-stage__pane--answer.is-visible {
  opacity: 1;
  transform: translateX(0);
  pointer-events: auto;
}

.quiz-stage__placeholder {
  text-align: center;
  padding: 2rem 1rem;
  border-radius: var(--arcade-radius-medium);
  border: 1px dashed var(--arcade-border);
  color: var(--arcade-muted);
}

.quiz-stage__placeholder-media {
  font-size: 3rem;
  margin-bottom: 0.5rem;
}

.quiz-question {
  display: grid;
  gap: 1rem;
  transition: opacity 260ms ease, transform 260ms ease;
}

.quiz-question.is-transitioning {
  opacity: 0;
  transform: translateY(12px);
}

.quiz-question__title {
  margin: 0;
  font-size: 1.3rem;
}

.quiz-question__text {
  margin: 0;
  color: var(--arcade-muted);
}

.quiz-question__media {
  display: grid;
  gap: 0.75rem;
}

.quiz-question__figure {
  margin: 0;
  border-radius: var(--arcade-radius-medium);
  overflow: hidden;
  background: var(--arcade-surface-alt);
}

.quiz-question__figure img {
  width: 100%;
  height: auto;
  display: block;
  max-height: min(60vh, 420px);
  object-fit: contain;
}

.quiz-question__figure figcaption,
.quiz-question__gallery-item figcaption {
  margin: 0;
  padding: 0.5rem 0.75rem 0.75rem;
  font-size: 0.9rem;
  color: var(--arcade-muted);
  text-align: center;
}

.quiz-question__gallery {
  display: grid;
  gap: 0.75rem;
}

.quiz-question__gallery-item {
  margin: 0;
  border-radius: var(--arcade-radius-small);
  overflow: hidden;
  background: var(--arcade-surface-alt);
}

.quiz-question__gallery-item img {
  width: 100%;
  display: block;
}

.quiz-question__choices {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.75rem;
}

.quiz-explanation {
  margin-top: 0.5rem;
  padding: 1rem 1.25rem;
  border-radius: var(--arcade-radius-medium);
  border: 1px solid var(--arcade-border);
  background: var(--arcade-surface-alt);
  display: grid;
  gap: 0.75rem;
}

.quiz-stage__toggle {
  align-self: flex-start;
  border-radius: 999px;
  border: 1px solid var(--arcade-border);
  padding: 0.5rem 1.25rem;
  font: inherit;
  font-weight: 600;
  background: var(--arcade-surface);
  color: var(--arcade-primary-strong);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  cursor: pointer;
  box-shadow: var(--arcade-shadow-soft);
  transition: transform 200ms ease, box-shadow 200ms ease;
  appearance: none;
}

.quiz-stage__toggle::after {
  content: '→';
  font-size: 1.1rem;
}

.quiz-stage__toggle:hover,
.quiz-stage__toggle:focus-visible {
  transform: translateY(-1px);
  box-shadow: 0 18px 40px rgba(78, 44, 255, 0.2);
}

.quiz-stage__toggle--return::after {
  content: '←';
}

.quiz-question.quiz-stage__pane--answer .quiz-stage__toggle {
  opacity: 0;
  pointer-events: none;
}

@media (prefers-reduced-motion: reduce) {
  .quiz-stage__pane,
  .quiz-question {
    transition-duration: 0ms;
  }

  .quiz-stage__pane--answer,
  .quiz-stage__pane--question.quiz-stage__pane--answer,
  .quiz-question.is-transitioning {
    transform: none !important;
  }
}

.quiz-explanation__text {
  margin: 0;
  font-weight: 600;
  color: var(--arcade-primary-strong);
}

.quiz-explanation__context {
  margin: 0;
  padding-left: 1.15rem;
  color: var(--arcade-muted);
  font-size: 0.95rem;
  display: grid;
  gap: 0.35rem;
}

.quiz-explanation__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.quiz-explanation__link {
  text-decoration: none;
}

.quiz-choice__button {
  width: 100%;
  text-align: left;
  border-radius: var(--arcade-radius-small);
  border: 1px solid rgba(78, 44, 255, 0.15);
  padding: 1rem 1.25rem;
  font-weight: 600;
  background: #fff;
  cursor: pointer;
  transition: border-color 150ms ease, box-shadow 150ms ease, transform 150ms ease;
}

.quiz-choice__button:hover {
  border-color: var(--arcade-primary);
  transform: translateY(-2px);
  box-shadow: 0 12px 24px rgba(78, 44, 255, 0.18);
}

.quiz-choice__button.is-selected {
  border-color: var(--arcade-primary);
  background: linear-gradient(120deg, rgba(78, 44, 255, 0.12), rgba(255, 138, 92, 0.18));
}

.quiz-choice__button.is-correct {
  border-color: rgba(40, 180, 127, 0.6);
  background: rgba(40, 180, 127, 0.1);
  color: var(--arcade-success);
}

.quiz-choice__button.is-incorrect {
  border-color: rgba(243, 90, 126, 0.6);
  background: rgba(243, 90, 126, 0.08);
  color: var(--arcade-error);
}

.quiz-choice__context {
  margin: 0.25rem 0 0;
  padding-left: 1.1rem;
  color: var(--arcade-muted);
  font-size: 0.9rem;
}

.quiz-stage__footer {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: center;
}

#quiz-controls .button {
  min-width: min(180px, 100%);
}

.quiz-summary__details {
  margin: 0;
  font-weight: 600;
  color: var(--arcade-primary-strong);
}

.arcade-tabs {
  display: inline-flex;
  background: var(--arcade-surface);
  border-radius: 999px;
  padding: 0.35rem;
  gap: 0.35rem;
  box-shadow: var(--arcade-shadow-soft);
  margin: 0 auto;
}

.arcade-tabs__tab {
  border: none;
  background: transparent;
  color: var(--arcade-muted);
  font-weight: 600;
  padding: 0.55rem 1.4rem;
  border-radius: 999px;
  cursor: pointer;
  transition: background 200ms ease, color 200ms ease;
}

.arcade-tabs__tab.is-active {
  background: var(--arcade-primary);
  color: #fff;
  box-shadow: 0 12px 25px rgba(78, 44, 255, 0.25);
}

.arcade-panel {
  margin-top: 1.5rem;
}

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

.competitive-mode {
  background: var(--arcade-surface);
  border-radius: var(--arcade-radius-large);
  padding: clamp(1.5rem, 4vw, 2.5rem);
  border: 1px solid var(--arcade-border);
  box-shadow: var(--arcade-shadow-soft);
  display: grid;
  gap: 1.5rem;
}

.competitive-mode__header {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: flex-end;
}

.competitive-mode__eyebrow {
  margin: 0;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  font-size: 0.85rem;
  color: var(--arcade-muted);
}

.competitive-mode__title {
  margin: 0.35rem 0 0;
  font-size: clamp(1.6rem, 4vw, 2.2rem);
}

.competitive-mode__status {
  text-align: right;
  color: var(--arcade-muted);
}

.competitive-mode__status-label {
  margin: 0;
  font-weight: 600;
  color: var(--arcade-primary-strong);
}

.competitive-mode__status-room {
  margin: 0;
  font-size: 0.95rem;
}

.competitive-mode__grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.25rem;
}

.competitive-mode__column {
  background: #fdfbff;
  border-radius: var(--arcade-radius-medium);
  padding: 1.25rem;
  border: 1px solid rgba(78, 44, 255, 0.08);
  display: grid;
  gap: 1rem;
}

.competitive-mode__column--stage {
  background: var(--arcade-surface-alt);
}

.competitive-mode__column--leaderboard {
  background: #fff6f1;
}

.competitive-form {
  display: grid;
  gap: 0.5rem;
}

.competitive-form__title {
  margin: 0;
  font-size: 1.1rem;
}

.competitive-form__label {
  font-size: 0.9rem;
  color: var(--arcade-muted);
}

.competitive-form input {
  border: 1px solid rgba(78, 44, 255, 0.2);
  border-radius: var(--arcade-radius-small);
  padding: 0.75rem 1rem;
  font-size: 1rem;
}

.competitive-form__submit {
  width: 100%;
  justify-self: start;
}

.competitive-lobby {
  border-radius: var(--arcade-radius-medium);
  border: 1px dashed rgba(78, 44, 255, 0.2);
  padding: 1rem;
  display: grid;
  gap: 0.85rem;
}

.competitive-lobby__header {
  display: flex;
  justify-content: space-between;
  gap: 0.5rem;
  align-items: baseline;
}

.competitive-lobby__title {
  margin: 0;
}

.competitive-lobby__hint {
  margin: 0;
  font-size: 0.9rem;
  color: var(--arcade-muted);
}

.competitive-lobby__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.35rem;
}

.competitive-lobby__item {
  padding: 0.5rem 0.75rem;
  border-radius: var(--arcade-radius-small);
  background: rgba(78, 44, 255, 0.06);
  font-weight: 600;
}

.competitive-lobby__empty {
  color: var(--arcade-muted);
}

.competitive-lobby__actions {
  display: flex;
  justify-content: flex-end;
}

.competitive-feedback {
  margin: 0;
  font-size: 0.9rem;
  color: var(--arcade-error);
  min-height: 1.2rem;
}

.competitive-stage {
  display: grid;
  gap: 1rem;
}

.competitive-stage__timer {
  font-size: 2.5rem;
  font-weight: 700;
  text-align: center;
  color: var(--arcade-primary-strong);
}

.competitive-stage__submit[disabled] {
  opacity: 0.5;
  cursor: not-allowed;
}

.quiz-question--compact {
  padding: 1rem;
  border-radius: var(--arcade-radius-medium);
  background: var(--arcade-surface);
  border: 1px solid rgba(78, 44, 255, 0.1);
}

.quiz-choice__button.is-locked {
  opacity: 0.7;
  cursor: not-allowed;
}

.quiz-choice__button[data-order="1"] {
  box-shadow: 0 0 0 2px rgba(78, 44, 255, 0.2);
}

.quiz-choice__button[data-order="2"] {
  box-shadow: 0 0 0 2px rgba(40, 180, 127, 0.2);
}

.quiz-choice__button[data-order="3"] {
  box-shadow: 0 0 0 2px rgba(255, 138, 92, 0.3);
}

.leaderboard {
  display: grid;
  gap: 0.75rem;
}

.leaderboard__header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 0.5rem;
}

.leaderboard__title {
  margin: 0;
}

.leaderboard__meta {
  margin: 0;
  font-size: 0.9rem;
  color: var(--arcade-muted);
}

.leaderboard__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.5rem;
}

.leaderboard__item {
  background: #fff;
  border-radius: var(--arcade-radius-small);
  padding: 0.75rem 1rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border: 1px solid rgba(78, 44, 255, 0.08);
}

.leaderboard__item--self {
  border-color: var(--arcade-primary);
  box-shadow: 0 12px 24px rgba(78, 44, 255, 0.18);
}

.leaderboard__player {
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
}

.leaderboard__name {
  margin: 0;
  font-weight: 600;
}

.leaderboard__score {
  margin: 0;
  color: var(--arcade-muted);
  font-size: 0.9rem;
}

.leaderboard__delta {
  font-weight: 700;
}

.leaderboard__delta--positive {
  color: var(--arcade-success);
}

.leaderboard__delta--negative {
  color: var(--arcade-error);
}

.leaderboard__empty {
  color: var(--arcade-muted);
}

@media (max-width: 1024px) {
  .competitive-mode__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .competitive-mode__column--leaderboard {
    grid-column: span 2;
  }
}

@media (max-width: 720px) {
  .arcade-tabs {
    width: 100%;
    flex-direction: column;
    border-radius: var(--arcade-radius-medium);
  }

  .arcade-tabs__tab {
    width: 100%;
  }

  .competitive-mode__grid {
    grid-template-columns: 1fr;
  }

  .competitive-mode__column--leaderboard {
    grid-column: auto;
  }
}

@media (max-width: 720px) {
  .arcade-carousel {
    grid-template-columns: repeat(1, minmax(0, 1fr));
  }

  .arcade-carousel__control {
    width: 100%;
  }

  .arcade-carousel__viewport {
    order: 3;
    width: 100%;
  }
}

@keyframes arcadeStageEnter {
  from {
    opacity: 0;
    transform: translateY(16px);
  }

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