:root {
  color-scheme: light;
  --bg: #fff8ff;
  --bg-soft: #f4f4ff;
  --surface: rgba(255,255,255,.86);
  --surface-solid: #ffffff;
  --text: #31223d;
  --muted: #75667f;
  --purple: #7c3aed;
  --purple-2: #9d5cff;
  --pink: #ff5ca8;
  --pink-soft: #ffd8eb;
  --aqua: #27d8d0;
  --aqua-soft: #c9fbf8;
  --yellow: #ffd45f;
  --line: rgba(124,58,237,.15);
  --shadow: 0 18px 50px rgba(79,42,116,.16);
  --radius: 28px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at 8% 8%, rgba(255,92,168,.16), transparent 28rem),
    radial-gradient(circle at 92% 22%, rgba(39,216,208,.14), transparent 24rem),
    linear-gradient(180deg, var(--bg), var(--bg-soft));
  color: var(--text);
  font-family: ui-rounded, "Nunito", "Avenir Next", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  transition: background .25s, color .25s;
}

body.dark {
  color-scheme: dark;
  --bg: #140f1d;
  --bg-soft: #0d1620;
  --surface: rgba(31,24,43,.88);
  --surface-solid: #21192c;
  --text: #fff8ff;
  --muted: #c5b8cf;
  --purple: #b381ff;
  --purple-2: #c9a6ff;
  --pink: #ff7fba;
  --pink-soft: #4b2840;
  --aqua: #5ce7df;
  --aqua-soft: #173c3d;
  --yellow: #ffe08a;
  --line: rgba(255,255,255,.11);
  --shadow: 0 20px 60px rgba(0,0,0,.42);
}

button, a { -webkit-tap-highlight-color: transparent; }
button { font: inherit; }
button:focus-visible, a:focus-visible { outline: 4px solid rgba(39,216,208,.55); outline-offset: 3px; }

.topbar {
  width: min(1120px, calc(100% - 28px));
  margin: 0 auto;
  padding: 18px 0 8px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: relative;
  z-index: 3;
}
.brand { color: var(--text); text-decoration: none; display: flex; align-items: center; gap: 9px; font-size: .98rem; }
.brand-mark { width: 34px; height: 34px; display: grid; place-items: center; border-radius: 12px; color: #fff; background: linear-gradient(135deg,var(--purple),var(--pink)); box-shadow: 0 8px 22px rgba(124,58,237,.25); }
.icon-btn { width: 44px; height: 44px; border: 1px solid var(--line); border-radius: 50%; color: var(--text); background: var(--surface); cursor: pointer; box-shadow: 0 7px 24px rgba(60,30,90,.08); font-size: 1.2rem; }

main { width: min(1120px, calc(100% - 28px)); margin: 0 auto; }
.hero { text-align: center; padding: 54px 0 26px; max-width: 760px; margin: 0 auto; }
.eyebrow, .mini-label { margin: 0 0 8px; color: var(--purple); font-weight: 900; text-transform: uppercase; letter-spacing: .12em; font-size: .72rem; }
.hero h1 { margin: 0; font-size: clamp(2.45rem, 12vw, 5.6rem); line-height: .93; letter-spacing: -.055em; }
.hero h1 span { background: linear-gradient(90deg,var(--pink),var(--purple),var(--aqua)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero-copy { margin: 22px auto 0; max-width: 610px; color: var(--muted); font-size: 1.02rem; line-height: 1.7; }

.game-shell {
  max-width: 640px;
  margin: 22px auto 72px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 34px;
  padding: 18px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(14px);
}
.game-head { display: flex; justify-content: space-between; align-items: end; padding: 5px 2px 14px; gap: 10px; }
.game-head h2, .section-heading h2 { margin: 0; font-size: 1.45rem; letter-spacing: -.03em; }
.moves-pill { flex: none; color: var(--purple); background: rgba(124,58,237,.09); border: 1px solid rgba(124,58,237,.13); border-radius: 999px; padding: 9px 12px; font-size: .84rem; }

.puzzle-frame-wrap { position: relative; padding: 13px; border-radius: 28px; background: linear-gradient(135deg,var(--purple),var(--pink) 47%,var(--aqua)); box-shadow: inset 0 0 0 3px rgba(255,255,255,.3), 0 14px 32px rgba(79,42,116,.18); }
.puzzle-grid { aspect-ratio: 1 / 1; display: grid; grid-template-columns: repeat(3,1fr); grid-template-rows: repeat(3,1fr); overflow: hidden; border-radius: 18px; background: #1d1427; gap: 3px; padding: 3px; }
.tile { position: relative; border: 0; padding: 0; cursor: pointer; background-repeat: no-repeat; background-color: #eee; background-size: 300% 300%; transition: transform .14s ease, box-shadow .14s ease, filter .14s ease; min-width: 0; }
.tile::after { content: ""; position: absolute; inset: 0; border: 1px solid rgba(255,255,255,.44); pointer-events: none; }
.tile.selected { z-index: 2; transform: scale(.93); box-shadow: inset 0 0 0 5px var(--yellow), 0 0 0 4px var(--yellow); filter: saturate(1.1) brightness(1.05); }
.tile.correct::before { content: "✓"; position: absolute; right: 5px; top: 5px; z-index: 1; width: 21px; height: 21px; display: grid; place-items: center; border-radius: 50%; background: rgba(39,216,208,.93); color: #082b29; font-size: .72rem; font-weight: 1000; }
.puzzle-grid.peek .tile { transition: none; }
.decorative-frame { position:absolute; inset:0; pointer-events:none; z-index:3; }
.corner { position:absolute; z-index:4; width:30px; height:30px; display:grid; place-items:center; color:#fff; text-shadow: 0 2px 8px rgba(0,0,0,.25); font-size: 1rem; }
.c1{left:1px;top:0}.c2{right:1px;top:0}.c3{left:1px;bottom:0}.c4{right:1px;bottom:0}
.status { min-height: 26px; margin: 14px 4px 10px; text-align: center; color: var(--muted); font-size: .9rem; }
.game-actions, .reward-actions { display: grid; grid-template-columns: 1fr; gap: 10px; }
.btn { min-height: 50px; border-radius: 16px; border: 0; padding: 12px 16px; font-weight: 900; cursor: pointer; transition: transform .12s, box-shadow .12s; }
.btn:active { transform: scale(.98); }
.btn-primary { color: white; background: linear-gradient(135deg,var(--purple),var(--pink)); box-shadow: 0 10px 25px rgba(124,58,237,.24); }
.btn-secondary { color: var(--text); background: var(--aqua-soft); border: 1px solid rgba(39,216,208,.32); }

.collection { margin: 0 auto 70px; }
.section-heading { display: flex; gap: 20px; justify-content: space-between; align-items: end; margin-bottom: 18px; }
.progress-text { margin: 0; color: var(--muted); font-weight: 800; font-size: .88rem; white-space: nowrap; }
.kitten-picker { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 12px; }
.kitten-option { position:relative; text-align:left; color:var(--text); border:1px solid var(--line); background:var(--surface); padding:8px; border-radius:20px; cursor:pointer; box-shadow: 0 9px 28px rgba(50,30,80,.08); }
.kitten-option.active { box-shadow: 0 0 0 3px var(--aqua), 0 10px 28px rgba(39,216,208,.18); }
.kitten-thumb { width:100%; aspect-ratio:1/1; display:block; object-fit:cover; border-radius:14px; background:#ddd; }
.kitten-meta { display:flex; align-items:center; justify-content:space-between; gap:5px; padding:9px 4px 4px; font-size:.82rem; font-weight:900; }
.solved-badge { display:none; color:#07302d; background:var(--aqua); border-radius:999px; padding:3px 7px; font-size:.66rem; }
.kitten-option.solved .solved-badge { display:inline-block; }

footer { width:min(1120px,calc(100% - 28px)); margin:0 auto; border-top:1px solid var(--line); color:var(--muted); text-align:center; padding:28px 0 40px; font-size:.86rem; }

.modal[hidden] { display:none; }
.modal { position:fixed; inset:0; z-index:50; display:grid; place-items:end center; }
.modal-backdrop { position:absolute; inset:0; background:rgba(18,10,26,.68); backdrop-filter: blur(5px); }
.win-card { position:relative; width:min(100%,560px); max-height:92vh; overflow:auto; border-radius:30px 30px 0 0; padding:28px 20px calc(24px + env(safe-area-inset-bottom)); background:var(--surface-solid); box-shadow:0 -20px 60px rgba(0,0,0,.28); text-align:center; animation:rise .28s ease-out both; }
@keyframes rise { from { transform:translateY(35px); opacity:.2 } to { transform:none; opacity:1 } }
.modal-close { position:absolute; right:14px; top:14px; width:42px; height:42px; border-radius:50%; border:1px solid var(--line); background:var(--bg-soft); color:var(--text); font-size:1.5rem; cursor:pointer; }
.confetti { color:var(--pink); letter-spacing:.45em; margin-bottom:7px; }
.win-card h2 { margin:0 0 15px; font-size:2rem; letter-spacing:-.04em; }
.reward-preview { max-width:320px; margin:0 auto; }
.frame-card { padding:10px; border-radius:24px; background:linear-gradient(135deg,var(--purple),var(--pink),var(--aqua)); box-shadow:0 13px 30px rgba(79,42,116,.18); }
.frame-card img { width:100%; aspect-ratio:1/1; display:block; object-fit:cover; border-radius:16px; border:5px solid rgba(255,255,255,.88); }
.reward-message { font-size:1.15rem; font-weight:900; line-height:1.45; margin:20px auto; max-width:390px; }
.text-btn { margin-top:15px; padding:8px; border:0; background:transparent; color:var(--purple); font-weight:900; cursor:pointer; }
.save-help { margin:12px auto 0; max-width:380px; color:var(--muted); font-size:.8rem; line-height:1.35; }

.sparkle { position:fixed; border-radius:50%; filter:blur(1px); pointer-events:none; z-index:-1; opacity:.4; }
.sparkle-a { width:150px;height:150px;left:-70px;top:45%;background:radial-gradient(circle,var(--pink),transparent 68%); }
.sparkle-b { width:180px;height:180px;right:-90px;top:62%;background:radial-gradient(circle,var(--aqua),transparent 68%); }

@media (min-width: 520px) {
  .game-actions, .reward-actions { grid-template-columns: 1fr 1fr; }
  .kitten-picker { grid-template-columns: repeat(3,minmax(0,1fr)); }
  .win-card { border-radius:30px; margin-bottom:4vh; padding:30px; }
  .modal { place-items:center; }
}
@media (min-width: 760px) {
  .topbar { padding-top:24px; }
  .hero { padding-top:74px; }
  .game-shell { padding:24px; }
  .kitten-picker { grid-template-columns: repeat(4,minmax(0,1fr)); gap:16px; }
}
@media (min-width: 1040px) {
  .kitten-picker { grid-template-columns: repeat(5,minmax(0,1fr)); }
}
@media (prefers-reduced-motion: reduce) { * { scroll-behavior:auto !important; animation-duration:.001ms !important; transition-duration:.001ms !important; } }

/* Trading-card reward reveal */
.sr-only {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}
.reward-stage {
  position: relative;
  width: min(76vw, 330px);
  margin: 0 auto 18px;
  display: grid;
  place-items: center;
  isolation: isolate;
}
.reward-glow {
  position: absolute;
  inset: 12% 8%;
  border-radius: 45%;
  background: radial-gradient(circle, rgba(255,92,168,.44), rgba(124,58,237,.22) 45%, rgba(39,216,208,.18) 65%, transparent 74%);
  filter: blur(22px);
  transform: scale(.9);
  animation: rewardPulse 1.8s ease-in-out infinite alternate;
  z-index: -1;
}
.reward-card-image {
  width: 100%;
  height: auto;
  max-height: 60vh;
  object-fit: contain;
  display: block;
  opacity: 0;
  transform: translateY(18px) scale(.86) rotate(-1.5deg);
  filter: drop-shadow(0 18px 28px rgba(23,12,37,.34));
}
.reward-card-image.reveal {
  animation: cardReveal .65s cubic-bezier(.2,.9,.2,1.15) forwards;
}
@keyframes cardReveal {
  0% { opacity: 0; transform: translateY(28px) scale(.78) rotate(-3deg); }
  68% { opacity: 1; transform: translateY(-5px) scale(1.035) rotate(.5deg); }
  100% { opacity: 1; transform: none; }
}
@keyframes rewardPulse {
  from { transform: scale(.88); opacity: .65; }
  to { transform: scale(1.08); opacity: 1; }
}
.confetti {
  height: 28px;
  display: flex;
  justify-content: center;
  gap: 18px;
  color: var(--pink);
  margin-bottom: 4px;
}
.confetti span { display: inline-block; animation: confettiPop .8s ease-out both; }
.confetti span:nth-child(2) { color: var(--aqua); animation-delay: .08s; }
.confetti span:nth-child(3) { color: var(--yellow); animation-delay: .14s; }
.confetti span:nth-child(4) { color: var(--purple); animation-delay: .20s; }
.confetti span:nth-child(5) { color: var(--pink); animation-delay: .26s; }
@keyframes confettiPop {
  0% { opacity:0; transform: translateY(15px) scale(.2) rotate(-25deg); }
  70% { opacity:1; transform: translateY(-7px) scale(1.3) rotate(12deg); }
  100% { opacity:1; transform:none; }
}
.win-card { overflow-x: hidden; }
.win-card h2 { margin-bottom: 10px; }

@media (min-width: 520px) {
  .reward-stage { width: min(50vw, 350px); }
  .reward-card-image { max-height: 64vh; }
}