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

:root {
  --sky-1: #6a5acd;
  --sky-2: #ff8fd0;
  --sky-3: #ffc86b;
  --card-bg: #ffffff;
  --card-border: #fff6a8;
  --matched: #a8ff9e;
  --shadow: 0 8px 0 rgba(0,0,0,0.15), 0 12px 24px rgba(0,0,0,0.18);
  --pop: 0 4px 0 rgba(0,0,0,0.15), 0 8px 16px rgba(0,0,0,0.18);
  --font: 'Comic Sans MS', 'Chalkboard SE', 'Trebuchet MS', system-ui, sans-serif;
}

html, body {
  margin: 0;
  padding: 0;
  min-height: 100vh;
  font-family: var(--font);
  color: #2b1b4a;
  background: linear-gradient(160deg, var(--sky-1) 0%, var(--sky-2) 55%, var(--sky-3) 100%);
  background-attachment: fixed;
  overflow-x: hidden;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
}

/* ============ STARS ============ */
.stars {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background-image:
    radial-gradient(2px 2px at 20px 30px, #fff, transparent),
    radial-gradient(2px 2px at 80px 120px, #fff, transparent),
    radial-gradient(1px 1px at 160px 60px, #fff, transparent),
    radial-gradient(2px 2px at 240px 200px, #fff, transparent),
    radial-gradient(1px 1px at 320px 40px, #fff, transparent),
    radial-gradient(2px 2px at 380px 300px, #fff, transparent),
    radial-gradient(1px 1px at 460px 180px, #fff, transparent),
    radial-gradient(2px 2px at 540px 80px, #fff, transparent),
    radial-gradient(1px 1px at 620px 240px, #fff, transparent),
    radial-gradient(2px 2px at 700px 140px, #fff, transparent);
  background-repeat: repeat;
  background-size: 800px 400px;
  animation: twinkle 4s ease-in-out infinite alternate;
  opacity: 0.8;
}
@keyframes twinkle {
  from { opacity: 0.5; }
  to { opacity: 0.95; }
}

/* ============ LAYOUT ============ */
header {
  text-align: center;
  padding: 2rem 1rem 0.5rem;
  position: relative;
  z-index: 1;
}
header h1 {
  font-size: clamp(2rem, 6vw, 3.5rem);
  margin: 0;
  color: #fff;
  text-shadow: 3px 3px 0 #2b1b4a, 0 0 20px rgba(255,255,255,0.5);
  letter-spacing: 2px;
}
.subtitle {
  color: #fff;
  font-size: clamp(1rem, 2.5vw, 1.3rem);
  margin: 0.5rem 0 0;
  text-shadow: 2px 2px 0 rgba(43,27,74,0.6);
}

main {
  position: relative;
  z-index: 1;
  padding: 1rem;
  max-width: 900px;
  margin: 0 auto;
}

.screen { display: none; }
.screen.active { display: block; animation: fadeIn 0.4s ease; }
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ============ DIFFICULTY PICKER ============ */
#picker {
  text-align: center;
  padding: 2rem 0;
}
#picker h2 {
  color: #fff;
  font-size: clamp(1.5rem, 4vw, 2.2rem);
  text-shadow: 2px 2px 0 #2b1b4a;
  margin-bottom: 2rem;
}
.level-buttons {
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
  max-width: 340px;
  margin: 0 auto;
}
.level-btn {
  font-family: var(--font);
  background: var(--card-bg);
  border: 4px solid var(--card-border);
  border-radius: 24px;
  padding: 1.2rem 1.5rem;
  cursor: pointer;
  box-shadow: var(--shadow);
  transition: transform 0.15s, box-shadow 0.15s;
  display: flex;
  align-items: center;
  gap: 1rem;
  font-size: 1.3rem;
  color: #2b1b4a;
}
.level-btn:hover, .level-btn:focus {
  transform: translateY(-4px);
  box-shadow: 0 12px 0 rgba(0,0,0,0.15), 0 16px 32px rgba(0,0,0,0.25);
  outline: none;
}
.level-btn:active {
  transform: translateY(2px);
  box-shadow: 0 4px 0 rgba(0,0,0,0.15), 0 6px 12px rgba(0,0,0,0.2);
}
.level-btn .star-icon { font-size: 1.5rem; }
.level-btn .level-name { flex: 1; text-align: left; font-weight: bold; }
.level-btn .level-info {
  font-size: 0.9rem;
  background: var(--card-border);
  padding: 0.25rem 0.75rem;
  border-radius: 999px;
  color: #7a5a00;
}
.level-btn.easy { border-color: #a8ff9e; }
.level-btn.medium { border-color: #ffc86b; }
.level-btn.hard { border-color: #ff8fd0; }

/* ============ GAME HEADER ============ */
.game-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  margin-bottom: 0.75rem;
  flex-wrap: wrap;
}
.small-btn {
  font-family: var(--font);
  background: #fff;
  border: 3px solid #2b1b4a;
  border-radius: 999px;
  padding: 0.5rem 1rem;
  font-size: 1rem;
  cursor: pointer;
  font-weight: bold;
  color: #2b1b4a;
  box-shadow: var(--pop);
}
.small-btn:active { transform: translateY(2px); box-shadow: 0 2px 0 rgba(0,0,0,0.15); }
.score {
  background: #fff;
  border: 3px solid #2b1b4a;
  border-radius: 999px;
  padding: 0.5rem 1.2rem;
  font-weight: bold;
  font-size: 1.1rem;
  box-shadow: var(--pop);
}

.instructions {
  text-align: center;
  color: #fff;
  font-size: 1.1rem;
  margin: 0.5rem 0 1rem;
  text-shadow: 2px 2px 0 rgba(43,27,74,0.6);
}
.arrow-hint {
  display: inline-block;
  animation: bounce 1s ease-in-out infinite;
}
@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-6px); }
}

/* ============ GAME BOARD ============ */
.board {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}
.column {
  background: rgba(255,255,255,0.25);
  border: 3px dashed #fff;
  border-radius: 20px;
  padding: 0.75rem;
  backdrop-filter: blur(4px);
}
.column h3 {
  text-align: center;
  color: #fff;
  margin: 0 0 0.75rem;
  font-size: 1.3rem;
  text-shadow: 2px 2px 0 rgba(43,27,74,0.6);
}
.card-stack {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  min-height: 100px;
}

/* ============ CARDS ============ */
.card {
  background: var(--card-bg);
  border: 4px solid var(--card-border);
  border-radius: 20px;
  padding: 1rem 0.5rem;
  text-align: center;
  cursor: grab;
  box-shadow: var(--pop);
  transition: transform 0.15s, box-shadow 0.15s, border-color 0.3s, background 0.3s;
  touch-action: none;
  position: relative;
}
.card:active { cursor: grabbing; }
.card.baby { border-color: #ffb3e6; }
.card.parent { cursor: default; border-color: #b3d9ff; }

.card .emoji {
  font-size: 3rem;
  line-height: 1;
  display: block;
  filter: drop-shadow(2px 3px 0 rgba(0,0,0,0.15));
}
.card .baby-emoji { font-size: 2.2rem; }
.card .label {
  display: block;
  margin-top: 0.3rem;
  font-weight: bold;
  font-size: 0.95rem;
  color: #2b1b4a;
}

.card.dragging {
  transform: scale(1.1) rotate(-3deg);
  box-shadow: 0 12px 0 rgba(0,0,0,0.15), 0 20px 40px rgba(0,0,0,0.3);
  z-index: 1000;
  opacity: 0.95;
}

.card.drop-target {
  border-color: #ffd700 !important;
  background: #fffbe0;
  transform: scale(1.05);
  box-shadow: 0 0 0 6px rgba(255,215,0,0.4), var(--pop);
}

.card.matched {
  background: linear-gradient(135deg, #a8ff9e, #fff6a8);
  border-color: #4caf50 !important;
  animation: matchPop 0.6s ease;
  cursor: default;
}
.card.matched::after {
  content: '✨';
  position: absolute;
  top: -10px;
  right: -10px;
  font-size: 1.8rem;
  animation: sparkle 1s ease infinite;
}
@keyframes matchPop {
  0% { transform: scale(1); }
  50% { transform: scale(1.15) rotate(3deg); }
  100% { transform: scale(1); }
}
@keyframes sparkle {
  0%, 100% { transform: scale(1) rotate(0); opacity: 1; }
  50% { transform: scale(1.3) rotate(20deg); opacity: 0.8; }
}

.card.matched-pair {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem;
}
.card.matched-pair .emoji { font-size: 2.5rem; }
.card.matched-pair .baby-emoji { font-size: 1.8rem; }

.card.shake {
  animation: shake 0.4s ease;
}
@keyframes shake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-8px) rotate(-2deg); }
  75% { transform: translateX(8px) rotate(2deg); }
}

/* ============ WIN SCREEN ============ */
#win {
  text-align: center;
  padding: 2rem 0;
}
.win-card {
  background: #fff;
  border: 5px solid #ffc86b;
  border-radius: 30px;
  padding: 2rem 1.5rem;
  max-width: 500px;
  margin: 0 auto;
  box-shadow: var(--shadow);
  position: relative;
  overflow: hidden;
}
.win-card h2 {
  font-size: clamp(1.8rem, 5vw, 2.5rem);
  color: #2b1b4a;
  margin: 0 0 0.5rem;
  animation: wiggle 0.8s ease infinite alternate;
}
@keyframes wiggle {
  from { transform: rotate(-2deg); }
  to { transform: rotate(2deg); }
}
.win-card p { font-size: 1.2rem; margin: 0 0 1.5rem; }
.win-creatures {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin: 1rem 0 1.5rem;
  font-size: 2.5rem;
}
.win-creatures span { animation: floaty 2s ease-in-out infinite; display: inline-block; }
.win-creatures span:nth-child(2) { animation-delay: 0.2s; }
.win-creatures span:nth-child(3) { animation-delay: 0.4s; }
.win-creatures span:nth-child(4) { animation-delay: 0.6s; }
.win-creatures span:nth-child(5) { animation-delay: 0.8s; }
.win-creatures span:nth-child(6) { animation-delay: 1.0s; }
.win-creatures span:nth-child(7) { animation-delay: 1.2s; }
.win-creatures span:nth-child(8) { animation-delay: 1.4s; }
@keyframes floaty {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}
.big-btn {
  font-family: var(--font);
  background: linear-gradient(135deg, #ff8fd0, #ffc86b);
  border: 4px solid #fff;
  border-radius: 999px;
  padding: 1rem 2rem;
  font-size: 1.4rem;
  font-weight: bold;
  color: #2b1b4a;
  cursor: pointer;
  box-shadow: var(--shadow);
}
.big-btn:active { transform: translateY(4px); box-shadow: 0 4px 0 rgba(0,0,0,0.15); }

/* ============ RESPONSIVE ============ */
@media (max-width: 480px) {
  .card .emoji { font-size: 2.4rem; }
  .card .baby-emoji { font-size: 1.8rem; }
  .card .label { font-size: 0.8rem; }
  .column { padding: 0.5rem; }
  .card { padding: 0.75rem 0.25rem; }
}

@media (min-width: 700px) {
  .board { gap: 2rem; }
  .card .emoji { font-size: 3.5rem; }
}