/* ── Reset & Base ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --purple:        #7F77DD;
  --purple-dark:   #5A52B8;
  --purple-light:  #EEEDFE;
  --purple-mid:    #C5C2F4;
  --pink:          #F472B6;
  --white:         #FFFFFF;
  --text:          #2C2A5E;
  --correct:       #34D399;
  --correct-light: #D1FAE5;
  --shadow:        0 4px 0 rgba(0,0,0,.12);
  --radius:        18px;
  --radius-sm:     12px;
}

html, body {
  min-height: 100%;
  font-family: 'Nunito', 'Arial Rounded MT Bold', Arial, sans-serif;
  background: var(--purple-light);
  color: var(--text);
  touch-action: manipulation;
}

/* ── Top Bar ── */
#top-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
  background: var(--purple);
  color: var(--white);
  padding: 12px 20px;
  box-shadow: var(--shadow);
  position: sticky;
  top: 0;
  z-index: 50;
}

#logo {
  font-size: 1.25rem;
  font-weight: 900;
}

#stars-row {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
}

.star-pip {
  font-size: 1.4rem;
  line-height: 1;
  filter: grayscale(1) opacity(.4);
  transition: filter .3s, transform .3s;
}

.star-pip.lit {
  filter: none;
  transform: scale(1.2);
}

/* ── Main ── */
#app {
  padding: 20px 16px 60px;
  display: flex;
  justify-content: center;
}

/* ── Grid ── */
#grid-container {
  display: grid;
  grid-template-columns: repeat(5, minmax(120px, 150px));
  gap: 14px;
  justify-content: center;
  width: 100%;
  max-width: 820px;
}

/* Tablet: 4 columns, comfortable card size */
@media (max-width: 700px) {
  #grid-container {
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
  }
}

/* Mobile: 5 columns × 4 rows = 20 cards, ~70px each, no scroll */
@media (max-width: 500px) {
  #app {
    padding: 10px 10px 36px;
  }
  #grid-container {
    grid-template-columns: repeat(5, 1fr);
    gap: 7px;
  }
}

/* ── Card ── */
.card {
  aspect-ratio: 1 / 1;
  position: relative;
  cursor: pointer;
  perspective: 700px;
}

.card-inner {
  position: absolute;
  inset: 0;
  transform-style: preserve-3d;
  transition: transform .4s cubic-bezier(.4,0,.2,1);
  border-radius: var(--radius);
}

.card.flipped   .card-inner,
.card.matched   .card-inner { transform: rotateY(180deg); }

/* shared face styles */
.card-front,
.card-back {
  position: absolute;
  inset: 0;
  border-radius: var(--radius);
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  overflow: hidden;
}

/* ── Back face ── */
.card-back {
  background: var(--purple);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow);
  border: 3px solid var(--purple-dark);
}

.card-back-pattern {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 6px;
  padding: 12px;
  opacity: .45;
}

.card-back-pattern span {
  font-size: 1.4rem;
  text-align: center;
  line-height: 1;
}

@media (max-width: 500px) {
  #top-bar {
    padding: 8px 12px;
  }
  #logo {
    font-size: 1rem;
  }
  .star-pip {
    font-size: 1rem;
  }
  .card-back-pattern span {
    font-size: 0.9rem;
  }
  .card-back-pattern {
    gap: 2px;
    padding: 6px;
  }
}

/* ── Front face ── */
.card-front {
  transform: rotateY(180deg);
  background: var(--white);
  border: 3px solid var(--purple-mid);
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 6px 5px 5px;
  gap: 0;
}

/* Image occupies top 60% of the card face */
.card-front img,
.card-front .card-placeholder {
  width: 100%;
  flex: 0 0 60%;
  min-height: 0;
  object-fit: contain;
  border-radius: var(--radius-sm);
}

.card-placeholder {
  background: var(--purple);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  font-weight: 900;
  color: var(--white);
  border-radius: var(--radius-sm);
}

/* Word label occupies bottom 40% */
.card-word {
  flex: 0 0 40%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  font-weight: 900;
  color: var(--purple-dark);
  text-align: center;
  letter-spacing: .02em;
  line-height: 1;
}

@media (max-width: 500px) {
  .card-front {
    padding: 3px 2px 2px;
    border-width: 2px;
  }
  .card-word {
    font-size: 10px;
    letter-spacing: 0;
  }
  .card-placeholder {
    font-size: 1.1rem;
  }
}

/* ── Matched state ── */
.card.matched .card-front {
  border-color: var(--correct);
  background: var(--correct-light);
}

/* ── No-match shake ── */
@keyframes shake {
  0%,100% { transform: rotateY(180deg) translateX(0); }
  25%      { transform: rotateY(180deg) translateX(-8px); }
  75%      { transform: rotateY(180deg) translateX(8px); }
}
.card.shake .card-inner {
  animation: shake .35s ease;
}

/* ── Attempts bar ── */
#attempts-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  text-align: center;
  background: var(--purple-mid);
  color: var(--purple-dark);
  font-size: .9rem;
  font-weight: 700;
  padding: 6px;
  z-index: 50;
}

/* ── Win Screen ── */
#win-screen {
  position: fixed;
  inset: 0;
  background: rgba(127,119,221,.92);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 200;
}

#win-screen[hidden] { display: none; }

#win-box {
  background: var(--white);
  border-radius: var(--radius);
  padding: 36px 32px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  max-width: 340px;
  width: 90%;
  box-shadow: 0 8px 0 rgba(0,0,0,.15);
  position: relative;
  z-index: 201;
}

#win-emoji {
  font-size: 4.5rem;
  animation: bounce .55s ease infinite alternate;
}

@keyframes bounce {
  from { transform: translateY(0); }
  to   { transform: translateY(-14px); }
}

#win-msg {
  font-size: 1.5rem;
  font-weight: 900;
  color: var(--purple-dark);
  line-height: 1.3;
}

#win-stars {
  font-size: 1.6rem;
  letter-spacing: 4px;
}

#play-again-btn {
  background: var(--purple);
  color: var(--white);
  border: none;
  border-radius: var(--radius-sm);
  padding: 14px 36px;
  font-family: inherit;
  font-size: 1.2rem;
  font-weight: 900;
  cursor: pointer;
  box-shadow: var(--shadow);
  min-height: 52px;
  transition: background .15s, transform .1s;
}

#play-again-btn:hover { background: var(--purple-dark); transform: translateY(-2px); }
#play-again-btn:active { transform: translateY(0); }

/* ── Confetti ── */
#confetti-container {
  position: fixed;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
  z-index: 200;
}

@keyframes confetti-fall {
  0%   { transform: translateY(-8vh) rotate(0deg);   opacity: 1; }
  100% { transform: translateY(108vh) rotate(720deg); opacity: 0; }
}

.confetti-piece {
  position: absolute;
  top: 0;
  animation: confetti-fall linear forwards;
}