:root {
  --navy: #0b1020;
  --stark-red: #c8102e;
  --gold: #f2b705;
  --steel: #9fb0c8;
  --paper: #f4f6fa;
  --glass: rgba(11, 16, 32, 0.72);
}

* { box-sizing: border-box; }

body {
  min-height: 100vh;
  margin: 0;
  color: var(--paper);
  font-family: "Segoe UI", system-ui, -apple-system, Arial, sans-serif;
  background:
    linear-gradient(rgba(11, 16, 32, 0.6), rgba(11, 16, 32, 0.85)),
    url("./assets/background.jpg") center / cover fixed no-repeat;
  background-color: var(--navy);
}

.game-shell {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 1.5rem 1rem 2rem;
}

/* Title */
.game-title {
  margin: 0 0 1.25rem;
  text-align: center;
  font-family: Impact, "Arial Black", "Segoe UI", sans-serif;
  font-weight: 900;
  font-size: clamp(2rem, 6vw, 3.75rem);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--paper);
  text-shadow: 0 3px 0 var(--stark-red), 0 6px 18px rgba(0, 0, 0, 0.6);
}
.game-title span { color: var(--gold); }

/* Panel */
.game-panel {
  width: 100%;
  max-width: 640px;
  padding: 1.25rem;
  background: var(--glass);
  border: 1px solid rgba(159, 176, 200, 0.25);
  border-radius: 18px;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  box-shadow: 0 18px 50px rgba(0, 0, 0, 0.5);
}

/* Stats */
.stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.75rem;
  margin-bottom: 1rem;
}
.stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 0.5rem 0.25rem;
  border-bottom: 2px solid var(--stark-red);
}
.stat-value {
  font-size: 1.6rem;
  font-weight: 800;
  line-height: 1.1;
  font-variant-numeric: tabular-nums;
}
.stat-label { font-size: 0.8rem; color: var(--steel); }

/* Progress */
.progress {
  height: 22px;
  margin-bottom: 1.25rem;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.12);
}
.progress-bar {
  min-width: 2.5rem;
  font-weight: 700;
  font-size: 0.85rem;
  color: var(--navy);
  background-color: var(--gold);
  transition: width 0.4s ease;
}

/* Board */
.game-board {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 10px;
}
@media (max-width: 575.98px) {
  .game-board { grid-template-columns: repeat(4, 1fr); gap: 8px; }
}

/* Cards */
.card-wrapper {
  all: unset;
  display: block;
  aspect-ratio: 4 / 5;
  perspective: 800px;
  cursor: pointer;
  border-radius: 10px;
}
.card-wrapper:focus-visible { outline: 3px solid var(--gold); outline-offset: 3px; }

.card-inner {
  position: relative;
  display: block;
  width: 100%;
  height: 100%;
  transform-style: preserve-3d;
  transition: transform 0.5s;
}
.card-wrapper.flipped .card-inner { transform: rotateY(180deg); }

.card-face {
  position: absolute;
  inset: 0;
  display: block;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  border-radius: 10px;
  overflow: hidden;
}
.card-front {
  transform: rotateY(180deg);
  background-color: var(--paper);
  background-size: cover;
  background-position: center 20%;
  background-repeat: no-repeat;
  border: 3px solid var(--paper);
}
.card-back {
  background: url("./assets/back.png") center / contain no-repeat #1a2140;
  border: 2px solid var(--gold);
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.45);
}
.card-wrapper:not(.flipped):hover .card-back { filter: brightness(1.2); }

/* Feedback */
.card-wrapper.matched { cursor: default; }
.card-wrapper.matched .card-front {
  border-color: var(--gold);
  box-shadow: 0 0 14px rgba(242, 183, 5, 0.7);
}
.card-wrapper.wrong .card-inner { animation: shake 0.4s 0.5s; }
@keyframes shake {
  0%, 100% { translate: 0; }
  25% { translate: -4px; }
  75% { translate: 4px; }
}

/* Controls */
.controls {
  display: flex;
  justify-content: center;
  gap: 0.75rem;
  margin-top: 1.25rem;
}
.btn-restart {
  background: var(--stark-red);
  border-color: var(--stark-red);
  color: #fff;
  font-weight: 700;
}
.btn-restart:hover, .btn-restart:focus-visible { background: #e0173a; border-color: #e0173a; color: #fff; }
.btn-sound {
  background: transparent;
  border: 1px solid var(--steel);
  color: var(--paper);
}
.btn-sound:hover, .btn-sound:focus-visible { background: rgba(255, 255, 255, 0.12); color: var(--paper); }

/* Win modal */
.win-modal {
  padding: 1rem;
  color: var(--paper);
  background: var(--navy);
  border: 2px solid var(--gold);
  border-radius: 16px;
}
.win-modal h2 { font-weight: 800; color: var(--gold); }
.win-record { min-height: 1.5em; color: var(--steel); }

@media (prefers-reduced-motion: reduce) {
  .card-inner, .progress-bar { transition: none; }
  .card-wrapper.wrong .card-inner { animation: none; }
}