:root {
  color-scheme: dark;
  --bg: #071021;
  --panel: #0b1220;
  --panel-strong: #111c31;
  --ink: #f8fbff;
  --muted: #aeb8c8;
  --line: rgba(255,255,255,0.13);
  --gold: #ffd166;
  --blue: #57c7ff;
  --green: #5ee0a0;
  --pink: #ff7aa8;
  --purple: #9b7cff;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }
html, body { min-height: 100%; margin: 0; }
body {
  display: grid;
  justify-items: center;
  color: var(--ink);
  background:
    radial-gradient(circle at 18% 10%, rgba(87,199,255,0.18), transparent 30%),
    radial-gradient(circle at 82% 18%, rgba(255,209,102,0.14), transparent 30%),
    linear-gradient(180deg, #071021 0%, #050814 100%);
}
button { font: inherit; cursor: pointer; }

.game-shell {
  width: min(100vw, 390px);
  min-height: 100svh;
  display: grid;
  align-content: start;
  gap: 0.8rem;
  padding: 1rem;
}

.hero-panel,
.score-panel,
.notice-panel,
.board-wrap,
.rules-panel {
  border: 1px solid var(--line);
  border-radius: 20px;
  background: color-mix(in srgb, var(--panel) 88%, transparent);
  box-shadow: 0 18px 42px rgba(0,0,0,0.28);
}

.hero-panel {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem;
}
.kicker {
  margin: 0 0 0.3rem;
  color: var(--gold);
  font-size: 0.72rem;
  font-weight: 900;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}
h1, h2, p { margin: 0; }
h1 { font-size: clamp(2rem, 11vw, 2.85rem); line-height: 0.95; }
h2 { font-size: 1rem; }
.round-chip {
  min-width: 5.4rem;
  border-radius: 999px;
  padding: 0.7rem 0.85rem;
  color: #17111d;
  background: linear-gradient(135deg, var(--gold), #ffefb0);
  font-weight: 950;
  text-align: center;
}

.score-panel,
.rules-panel {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.55rem;
  padding: 0.75rem;
}
.score-panel div,
.rules-panel div {
  border-radius: 15px;
  padding: 0.75rem 0.55rem;
  text-align: center;
  background: rgba(255,255,255,0.06);
}
.score-panel span,
.rules-panel span {
  display: block;
  color: var(--muted);
  font-size: 0.68rem;
  font-weight: 900;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.score-panel strong,
.rules-panel strong {
  display: block;
  margin-top: 0.24rem;
  font-size: 1.05rem;
}

.notice-panel {
  display: grid;
  gap: 0.35rem;
  padding: 0.9rem;
  color: var(--muted);
  background: rgba(87,199,255,0.08);
}
.notice-panel strong { color: var(--ink); }
.notice-panel p { font-size: 0.86rem; line-height: 1.35; }

.board-wrap { padding: 0.8rem; }
.board-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
}
.board-heading button {
  min-height: 2.35rem;
  border: 0;
  border-radius: 12px;
  padding: 0 0.8rem;
  color: #071021;
  background: var(--gold);
  font-weight: 900;
}
.memory-board {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.5rem;
}
.card {
  position: relative;
  aspect-ratio: 0.82;
  border: 0;
  border-radius: 14px;
  color: var(--ink);
  background: transparent;
  perspective: 800px;
  padding: 0;
}
.card-inner {
  position: absolute;
  inset: 0;
  border-radius: inherit;
  transform-style: preserve-3d;
  transition: transform 220ms ease;
}
.card.is-open .card-inner,
.card.is-matched .card-inner { transform: rotateY(180deg); }
.card-face {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: inherit;
  backface-visibility: hidden;
  overflow: hidden;
}
.card-back {
  background:
    linear-gradient(135deg, rgba(87,199,255,0.18), transparent 44%),
    repeating-linear-gradient(45deg, #0d1728 0 8px, #101d32 8px 16px);
}
.card-back::before {
  content: "PF";
  display: grid;
  width: 2.7rem;
  height: 2.7rem;
  place-items: center;
  border-radius: 50%;
  color: #071021;
  background: var(--gold);
  font-size: 0.86rem;
  font-weight: 950;
}
.card-front {
  transform: rotateY(180deg);
  background: linear-gradient(180deg, #15223a, #0a111f);
}
.card.is-matched .card-front {
  border-color: color-mix(in srgb, var(--green) 70%, white);
  box-shadow: inset 0 0 0 2px rgba(94,224,160,0.35), 0 0 18px rgba(94,224,160,0.18);
}
.symbol {
  position: relative;
  display: grid;
  width: 52%;
  aspect-ratio: 1;
  place-items: center;
}
.symbol::before,
.symbol::after { content: ""; position: absolute; }
.symbol-sun::before { inset: 14%; border-radius: 50%; background: var(--gold); box-shadow: 0 0 0 10px rgba(255,209,102,0.16); }
.symbol-moon::before { inset: 12%; border-radius: 50%; background: var(--blue); }
.symbol-moon::after { inset: 9% 2% 12% 28%; border-radius: 50%; background: #15223a; }
.symbol-gem::before { inset: 13%; transform: rotate(45deg); border-radius: 8px; background: var(--purple); }
.symbol-bolt::before { width: 42%; height: 76%; clip-path: polygon(62% 0, 28% 44%, 55% 44%, 36% 100%, 82% 35%, 55% 35%); background: var(--gold); }
.symbol-leaf::before { inset: 15%; border-radius: 70% 10% 70% 10%; transform: rotate(-25deg); background: var(--green); }
.symbol-orbit::before { inset: 20%; border-radius: 50%; background: var(--pink); }
.symbol-orbit::after { inset: 8% 0; border: 3px solid rgba(255,255,255,0.75); border-left-color: transparent; border-right-color: transparent; border-radius: 50%; transform: rotate(-22deg); }

.card:focus-visible,
.board-heading button:focus-visible {
  outline: 3px solid rgba(255,209,102,0.55);
  outline-offset: 3px;
}

@media (max-height: 760px) {
  .game-shell { gap: 0.55rem; padding: 0.7rem; }
  .notice-panel { display: none; }
  h1 { font-size: 2rem; }
  .hero-panel { padding: 0.8rem; }
  .score-panel, .rules-panel, .board-wrap { padding: 0.6rem; }
  .memory-board { gap: 0.42rem; }
}