:root {
  color-scheme: light;
  --bg-gradient: linear-gradient(180deg, #fce4ff 0%, #faffd3 100%);
  --card-bg: rgba(255, 255, 255, 0.86);
  --primary: #5f65ff;
  --primary-dark: #4348d9;
  --accent: #ff8a65;
  --success: #2ecc71;
  --danger: #ff5f6d;
  --text: #263238;
  --muted: #607d8b;
  --tile-back: #ffe082;
  --border-radius: 18px;
  --shadow-soft: 0 14px 32px rgba(63, 50, 90, 0.15);
  --transition-fast: 180ms ease;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: 'Segoe UI', 'Quicksand', 'Nunito', sans-serif;
  background: var(--bg-gradient);
  color: var(--text);
  display: flex;
  justify-content: center;
  padding: 32px 16px 40px;
}

.wrapper {
  width: 100%;
  max-width: 1100px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.hero {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  align-items: center;
  justify-content: space-between;
  background: var(--card-bg);
  border-radius: var(--border-radius);
  padding: 24px;
  box-shadow: var(--shadow-soft);
}

.hero__intro {
  flex: 1 1 300px;
  text-align: center;
}

.hero__intro h1 {
  margin: 0 0 8px;
  font-size: clamp(2rem, 3vw + 1rem, 2.8rem);
  color: var(--primary);
}

.hero__intro p {
  margin: 0;
  color: var(--muted);
  line-height: 1.6;
}

.scoreboard {
  flex: 1 1 320px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 12px;
}

.scoreboard__item {
  background: rgba(255, 255, 255, 0.92);
  border-radius: 16px;
  padding: 12px;
  text-align: center;
  box-shadow: 0 10px 20px rgba(95, 101, 255, 0.12);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.scoreboard__item .label {
  display: block;
  font-size: 0.85rem;
  color: var(--muted);
  letter-spacing: 0.4px;
}

.scoreboard__item .value {
  display: block;
  margin-top: 6px;
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--text);
}

.scoreboard.combo-celebrate .scoreboard__item .value {
  animation: sparkle 600ms ease;
}

.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
  justify-content: center;
}

.control-button,
.primary-button,
.secondary-button {
  border: none;
  border-radius: 999px;
  padding: 10px 20px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast);
  background: rgba(255, 255, 255, 0.8);
  color: var(--primary-dark);
  box-shadow: 0 8px 18px rgba(86, 99, 255, 0.2);
  touch-action: manipulation;
}

.control-button:hover,
.primary-button:hover,
.secondary-button:hover {
  transform: translateY(-2px) scale(1.02);
}

.control-button:active,
.primary-button:active,
.secondary-button:active {
  transform: translateY(0) scale(0.99);
}

.control-button.toggle.is-on {
  background: var(--primary);
  color: #fff;
}

.control-button.primary {
  background: var(--primary);
  color: #fff;
}

.control-button.danger {
  background: rgba(255, 95, 109, 0.16);
  color: var(--danger);
  box-shadow: none;
}

.control-button:disabled {
  cursor: not-allowed;
  opacity: 0.6;
  transform: none !important;
  box-shadow: none !important;
}

.control-button.is-active {
  box-shadow: 0 10px 22px rgba(95, 101, 255, 0.26);
  transform: translateY(-1px);
}

.control-button.toggle.is-off {
  background: rgba(255, 255, 255, 0.65);
  color: var(--muted);
  box-shadow: none;
}

.primary-button {
  background: linear-gradient(135deg, var(--primary) 0%, #8c9eff 100%);
  color: #fff;
}

.secondary-button {
  background: rgba(95, 101, 255, 0.12);
  color: var(--primary-dark);
  box-shadow: none;
}

.status-bar {
  text-align: center;
  background: rgba(255, 255, 255, 0.75);
  border-radius: var(--border-radius);
  padding: 14px 18px;
  color: var(--muted);
  box-shadow: 0 10px 24px rgba(255, 138, 101, 0.15);
}

.board-section {
  display: flex;
  justify-content: center;
}

.board-wrapper {
  position: relative;
  width: min(100%, 960px);
}

.board {
  display: flex;
  gap: 12px;
  justify-content: center;
  align-items: center;
  flex-wrap: nowrap;
  overflow-x: auto;
  background: rgba(255, 255, 255, 0.6);
  padding: 16px;
  border-radius: 24px;
  box-shadow: var(--shadow-soft);
  transition: transform var(--transition-fast);
}

.board.is-disabled {
  pointer-events: none;
  opacity: 0.7;
}

.board--shake {
  animation: wobble 320ms ease;
}

.board--celebrate .tile {
  animation: bounce 420ms ease;
}

.tile {
  position: relative;
  aspect-ratio: 1 / 1;
  flex: 0 0 clamp(120px, 18vw, 180px);
  border: none;
  border-radius: 18px;
  overflow: hidden;
  cursor: pointer;
  background: rgba(255, 255, 255, 0.3);
  box-shadow: 0 10px 16px rgba(88, 94, 255, 0.1);
  padding: 0;
  transform: translateZ(0);
  transition: transform 160ms ease, box-shadow 160ms ease;
}

.tile:focus-visible {
  outline: 3px solid var(--primary);
  outline-offset: 2px;
}

.tile:is(:hover, :focus-visible) .tile__inner {
  transform: scale(1.03);
}

.tile-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  min-width: clamp(120px, 18vw, 180px);
}

.tile__caption {
  font-size: 1.95rem;
  font-weight: 600;
  color: var(--primary-dark);
  text-align: center;
  padding: 0 4px;
  line-height: 1.2;
}

.tile__inner {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  transition: transform 180ms ease;
}

.tile__front,
.tile__back {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: clamp(1.8rem, 2vw + 1rem, 2.8rem);
  opacity: 0;
  transform: scale(0.6);
  transition: opacity 220ms ease, transform 220ms ease;
}

.tile__front {
  color: var(--muted);
}

.tile__back {
  background: var(--tile-back);
  background-size: contain;
  background-position: center;
  background-repeat: no-repeat;
  border-radius: 14px;
  margin: 8px;
  box-shadow: inset 0 6px 12px rgba(0, 0, 0, 0.08);
}

.tile:not(.is-preview):not(.is-found):not(.is-revealed) .tile__front {
  opacity: 1;
  transform: scale(1);
}

.tile.is-preview .tile__back,
.tile.is-found .tile__back,
.tile.is-revealed .tile__back {
  opacity: 1;
  transform: scale(1);
}

.tile.is-preview .tile__front,
.tile.is-found .tile__front,
.tile.is-revealed .tile__front {
  opacity: 0;
  transform: scale(0.7);
}

.tile.is-found {
  cursor: default;
  box-shadow: 0 12px 24px rgba(46, 204, 113, 0.25);
}

.tile.is-found .tile__back {
  background: rgba(46, 204, 113, 0.2);
  color: var(--success);
}

.tile.is-miss {
  animation: wobble 360ms ease;
}

.tile.is-miss .tile__back {
  background: rgba(255, 95, 109, 0.15);
  color: var(--danger);
}

.tile[disabled] {
  cursor: not-allowed;
}

.memorize-banner {
  position: absolute;
  inset: auto 0 -56px 0;
  text-align: center;
  font-weight: 600;
  color: var(--primary-dark);
  opacity: 0;
  transform: translateY(12px);
  transition: opacity var(--transition-fast), transform var(--transition-fast);
}

.memorize-banner.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.hidden {
  display: none !important;
}

.future-section {
  background: rgba(255, 255, 255, 0.78);
  border-radius: var(--border-radius);
  padding: 18px 22px;
  color: var(--muted);
  box-shadow: 0 12px 30px rgba(95, 101, 255, 0.12);
}

.future-section__title {
  margin: 0 0 6px;
  color: var(--primary-dark);
}

.future-section__text {
  margin: 0;
  line-height: 1.5;
}

.todo-hint {
  background: rgba(255, 225, 130, 0.8);
  padding: 4px 10px;
  border-radius: 999px;
  color: #9c6b00;
  font-weight: 600;
}

.modal {
  position: fixed;
  inset: 0;
  display: none;
  justify-content: center;
  align-items: center;
  background: rgba(76, 60, 126, 0.35);
  backdrop-filter: blur(6px);
  padding: 20px;
  z-index: 20;
}

.modal.is-visible {
  display: flex;
}

.modal__content {
  width: min(420px, 90vw);
  background: rgba(255, 255, 255, 0.92);
  border-radius: 24px;
  padding: 26px;
  box-shadow: 0 20px 40px rgba(79, 60, 126, 0.25);
  text-align: center;
}

.modal__content h2 {
  margin-top: 0;
  color: var(--primary-dark);
}

.modal__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
  margin-top: 18px;
}

.final-score {
  font-size: 1.4rem;
  margin: 12px 0;
  color: var(--text);
}

.badge {
  margin: 12px auto 4px;
  width: fit-content;
  padding: 10px 26px;
  border-radius: 50px;
  font-weight: 700;
  letter-spacing: 1px;
  color: #fff;
  background: linear-gradient(135deg, #ffb347 0%, #ffcc33 100%);
  box-shadow: 0 14px 24px rgba(255, 195, 35, 0.28);
}

.badge--s {
  background: linear-gradient(135deg, #9c27b0 0%, #ff80ab 100%);
  box-shadow: 0 14px 28px rgba(156, 39, 176, 0.35);
}

.badge--gold {
  background: linear-gradient(135deg, #ffb347 0%, #ffd54f 100%);
}

.badge--silver {
  background: linear-gradient(135deg, #cfd8dc 0%, #b0bec5 100%);
}

.badge--bronze {
  background: linear-gradient(135deg, #d7ccc8 0%, #a1887f 100%);
}

.audio-group {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.evaluation-group {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  justify-content: center;
}

.tile.is-hidden {
  cursor: default;
  pointer-events: none;
}

.tile.is-hidden .tile__front,
.tile.is-hidden .tile__back {
  opacity: 0;
  transform: scale(0.7);
}

#result-caption {
  font-size: 2.65rem;
}

.confetti-layer {
  position: fixed;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
  z-index: 40;
}

.confetti {
  position: absolute;
  width: 12px;
  height: 20px;
  background: var(--confetti-color, #ffcc33);
  opacity: 0.9;
  transform: translateY(-110vh) rotate(0deg);
  animation: confetti-fall linear forwards;
}

@keyframes confetti-fall {
  0% {
    transform: translateY(-110vh) rotate(0deg);
  }
  100% {
    transform: translateY(110vh) rotate(720deg);
  }
}

@keyframes wobble {
  0% {
    transform: translateX(0);
  }
  25% {
    transform: translateX(-6px);
  }
  50% {
    transform: translateX(6px);
  }
  75% {
    transform: translateX(-4px);
  }
  100% {
    transform: translateX(0);
  }
}

@keyframes sparkle {
  0% {
    transform: scale(1);
  }
  40% {
    transform: scale(1.17);
  }
  100% {
    transform: scale(1);
  }
}

@keyframes bounce {
  0% {
    transform: translateY(0);
  }
  40% {
    transform: translateY(-6px);
  }
  100% {
    transform: translateY(0);
  }
}

@media (max-width: 768px) {
  body {
    padding: 24px 12px 32px;
  }

  .hero {
    padding: 20px;
  }

  .controls {
    flex-direction: column;
  }

  .control-button,
  .primary-button,
  .secondary-button {
    width: 100%;
    justify-content: center;
  }

  .audio-group,
  .evaluation-group {
    width: 100%;
  }

  .board-wrapper {
    width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 1ms !important;
    transition-duration: 1ms !important;
  }
}