:root {
  --bg: #1a1b20;
  --panel: #b92438;
  --topbar: #0d4f74;
  --text: #f8fafc;
  --cols: 3;
  --card-size: 82px;
  --gap: 12px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  align-items: stretch;
  justify-content: center;
  padding: 0;
  font-family: "Trebuchet MS", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
}

.memory-shell {
  width: 100vw;
  min-height: 100vh;
}

.memory-board {
  min-height: 100vh;
  background: var(--panel);
  box-shadow: none;
}

.memory-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 18px;
  background: var(--topbar);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.memory-stage {
  position: relative;
  min-height: calc(100vh - 48px);
  padding: 28px 24px 34px;
  text-align: center;
}

#statusText {
  margin: 0 0 10px;
  color: rgba(255, 255, 255, 0.92);
}

.lives {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 8px;
  margin-bottom: 18px;
}

.life {
  color: #ff4d6d;
  font-size: 1.2rem;
  line-height: 1;
  transition: color 0.2s ease, transform 0.2s ease;
}

.life.lost {
  color: #1f2937;
}

.controls {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  display: flex;
  justify-content: center;
  gap: 10px;
  flex-wrap: wrap;
  z-index: 3;
}

button,
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 18px;
  border: none;
  border-radius: 10px;
  background: #ffe082;
  color: #111827;
  text-decoration: none;
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.15s ease, filter 0.15s ease;
}

button:hover,
.btn:hover {
  transform: translateY(-1px);
  filter: brightness(1.03);
}

#startBtn {
  min-width: 220px;
  padding: 18px 28px;
  border-radius: 14px;
  font-size: 1.25rem;
  box-shadow: 0 12px 24px rgba(0, 0, 0, 0.22);
}

.secondary-btn {
  background: #182633;
  color: #f8fafc;
}

.top-home-btn {
  padding: 8px 14px;
  font-size: 0.76rem;
}

.grid {
  display: grid;
  grid-template-columns: repeat(var(--cols), var(--card-size));
  gap: var(--gap);
  justify-content: center;
  align-content: start;
  min-height: 320px;
  width: 100%;
  margin: 0 auto;
  padding: 12px 0;
}

.card {
  width: var(--card-size);
  height: calc(var(--card-size) * 1.16);
  padding: 0;
  border: none;
  background: transparent;
  cursor: pointer;
  perspective: 900px;
}

.card-inner {
  position: relative;
  width: 100%;
  height: 100%;
  transform-style: preserve-3d;
  transition: transform 0.45s ease;
}

.card.flipped .card-inner,
.card.matched .card-inner {
  transform: rotateY(180deg);
}

.card-face {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 10px;
  backface-visibility: hidden;
}

.card-back {
  background:
    linear-gradient(135deg, #0a1b4f 0 18%, transparent 18%),
    repeating-linear-gradient(
      45deg,
      #ffbf2f 0 12px,
      #ff603b 12px 24px,
      #081f56 24px 36px,
      #11b1c6 36px 48px
    );
  border: 2px solid rgba(255, 255, 255, 0.08);
  box-shadow: 0 8px 16px rgba(0, 0, 0, 0.22);
}

.card-front {
  transform: rotateY(180deg);
  background: #fff7e8;
  border: 2px solid #ffd166;
  box-shadow: 0 8px 16px rgba(0, 0, 0, 0.18);
  color: #111827;
  font-size: clamp(1.5rem, 2vw, 2.2rem);
}

.card.matched {
  filter: saturate(1.08);
}

#congrats {
  display: none;
  position: absolute;
  top: 28px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 4;
  margin: 0;
  padding: 12px 18px;
  border-radius: 12px;
  background: #22c55e;
  color: #052e16;
  font-size: 1rem;
  font-weight: 700;
  box-shadow: 0 10px 22px rgba(0, 0, 0, 0.18);
}

@media (max-width: 768px) {
  .memory-topbar {
    justify-content: center;
    flex-wrap: wrap;
    font-size: 0.72rem;
  }

  .memory-stage {
    min-height: auto;
    padding: 16px 10px 22px;
  }

  .controls {
    width: calc(100% - 20px);
  }

  #startBtn {
    min-width: 180px;
    font-size: 1.05rem;
    padding: 14px 22px;
  }

  .grid {
    min-height: 180px;
    gap: 8px;
  }
}