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:root {
  --bg-start: #f7e3ff;
  --bg-end: #d6f6ff;
  --accent: #f89ad1;
  --accent-2: #a6c8ff;
  --forest: #7bdcb5;
  --text-dark: #3e2a58;
  --cell-size: min(52px, 8vw);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: 'Nunito', system-ui, sans-serif;
  color: var(--text-dark);
  background: radial-gradient(circle at 20% 20%, var(--bg-start), var(--bg-end));
  min-height: 100vh;
  overflow-x: hidden;
}

.sparkle-background {
  position: fixed;
  inset: 0;
  font-size: 7rem;
  opacity: 0.05;
  text-align: center;
  padding-top: 2rem;
  pointer-events: none;
  letter-spacing: 1rem;
}

.wrapper {
  max-width: 1100px;
  margin: 0 auto;
  padding: 2rem clamp(1rem, 5vw, 3.5rem) 4rem;
  position: relative;
  z-index: 1;
}

.hero {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: center;
  justify-content: space-between;
}

h1, h2 {
  font-family: 'Baloo 2', 'Nunito', sans-serif;
  margin: 0;
  color: #ff6bba;
}

.tagline {
  margin: 0.2rem 0 0;
}

.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  align-items: center;
  background: rgba(255, 255, 255, 0.75);
  padding: 0.8rem 1rem;
  border-radius: 1.2rem;
  box-shadow: 0 18px 45px rgba(166, 200, 255, 0.35);
}

.stat {
  font-weight: 600;
}

.difficulty {
  display: flex;
  flex-direction: column;
  font-weight: 600;
  color: var(--text-dark);
}

select {
  margin-top: 0.2rem;
  border-radius: 999px;
  border: 2px solid rgba(255, 139, 206, 0.4);
  padding: 0.3rem 0.8rem;
  background: white;
  font-weight: 600;
}

.btn {
  padding: 0.5rem 1.4rem;
  border-radius: 999px;
  border: none;
  background: linear-gradient(120deg, var(--accent), var(--accent-2));
  color: white;
  font-weight: 600;
  cursor: pointer;
  box-shadow: 0 12px 25px rgba(255, 107, 186, 0.35);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 28px rgba(166, 200, 255, 0.4);
}

.btn-lg {
  font-size: 1.1rem;
  padding: 0.8rem 2.3rem;
}

.main-area {
  margin-top: 2rem;
  display: grid;
  grid-template-columns: minmax(280px, 1.1fr) minmax(220px, 0.9fr);
  gap: 1.5rem;
}

.board {
  width: min(520px, 95vw);
  background: rgba(255, 255, 255, 0.8);
  border-radius: 24px;
  padding: 1rem;
  display: grid;
  gap: 0.35rem;
  box-shadow: inset 0 0 25px rgba(255, 255, 255, 0.7), 0 20px 40px rgba(179, 160, 255, 0.35);
}

.cell {
  width: var(--cell-size);
  height: var(--cell-size);
  border-radius: 14px;
  border: none;
  font-size: 1.2rem;
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.2s ease, background 0.3s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'Baloo 2', 'Nunito', sans-serif;
  user-select: none;
  -webkit-user-select: none;
  touch-action: manipulation;
}

.cell--hidden {
  background: linear-gradient(135deg, #d9f1ff, #ffe6fa);
  box-shadow: 0 8px 15px rgba(122, 178, 255, 0.35);
  color: transparent;
}

.cell--hidden::after {
  content: '🌱';
  font-size: 1.1rem;
  opacity: 0.5;
}

.cell--revealed {
  background: rgba(255, 255, 255, 0.95);
  box-shadow: inset 0 0 12px rgba(255, 255, 255, 0.8);
}

.cell--flagged::after {
  content: '✨';
  font-size: 1.3rem;
}

.cell--flagged {
  background: linear-gradient(135deg, rgba(255, 194, 232, 0.95), rgba(209, 224, 255, 0.95));
  box-shadow: 0 8px 18px rgba(255, 125, 206, 0.4);
}

.cell--fairy {
  background: radial-gradient(circle, #fff6ff, #ffe0ff);
  box-shadow: 0 0 18px rgba(255, 126, 203, 0.7);
  animation: fairy-pop 0.6s ease;
}

@keyframes fairy-pop {
  0% { transform: scale(0.5); opacity: 0; }
  100% { transform: scale(1); opacity: 1; }
}

.cell--num-1 { color: #7ab6ff; }
.cell--num-2 { color: #64c5b8; }
.cell--num-3 { color: #ff8fb9; }
.cell--num-4 { color: #b892ff; }
.cell--num-5 { color: #ffa56b; }
.cell--num-6 { color: #94d0ff; }
.cell--num-7 { color: #c4a0ff; }
.cell--num-8 { color: #ff6b9c; }

.instructions {
  background: rgba(255, 255, 255, 0.88);
  border-radius: 1.5rem;
  padding: 1.2rem 1.5rem;
  box-shadow: 0 18px 40px rgba(138, 166, 255, 0.3);
}

.instructions p {
  margin: 0.2rem 0 0;
}

.collection {
  margin-top: 1.5rem;
  padding: 1rem 1.2rem;
  border-radius: 1.2rem;
  background: rgba(248, 218, 255, 0.45);
  box-shadow: inset 0 0 15px rgba(255, 255, 255, 0.7);
}

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

.collection-header h3 {
  margin: 0;
  font-size: 1.1rem;
  color: #f26dbd;
}

.collection-count {
  font-weight: 700;
  color: var(--text-dark);
}

.collection-empty {
  margin: 0.5rem 0 0;
  font-style: italic;
  opacity: 0.85;
}

.collection-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin-top: 0.7rem;
  min-height: 1.8rem;
}

.collection-fairy {
  font-size: 1.4rem;
  filter: drop-shadow(0 4px 8px rgba(242, 109, 189, 0.4));
  animation: fairy-bob 4s ease-in-out infinite;
}

.collection-fairy--new {
  animation: fairy-collect 0.6s ease forwards;
}

@keyframes fairy-collect {
  0% { transform: scale(0.3) translateY(12px); opacity: 0; }
  60% { transform: scale(1.2) translateY(-4px); opacity: 1; }
  100% { transform: scale(1) translateY(0); opacity: 1; }
}

@keyframes fairy-bob {
  0% { transform: translateY(0); }
  50% { transform: translateY(-3px); }
  100% { transform: translateY(0); }
}

.overlay {
  position: fixed;
  inset: 0;
  background: rgba(216, 197, 255, 0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 20;
  transition: opacity 0.3s ease;
}

.overlay.hidden {
  opacity: 0;
  pointer-events: none;
}

.overlay-card {
  background: white;
  padding: 2.2rem 3rem;
  border-radius: 2rem;
  text-align: center;
  box-shadow: 0 30px 60px rgba(162, 147, 255, 0.4);
}

@media (max-width: 900px) {
  .main-area {
    grid-template-columns: 1fr;
  }

  .board {
    justify-self: center;
  }
}