:root {
  --primary: #d9a441;
  --primary-dark: #c28f34;
  --accent: #2f6a54;
  --accent-dark: #1f4a3d;
  --ink-on-gold: #4a3413;
  --success: #16a34a;
  --danger: #dc2626;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  font-family: 'Karla', sans-serif;
  background: radial-gradient(circle at top, var(--accent) 0%, var(--accent-dark) 70%);
  color: #eef0ea;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.wrap {
  width: 100%;
  max-width: 560px;
  position: relative;
}

.back-link {
  display: inline-block;
  margin-bottom: 20px;
  color: #eef0ea;
  text-decoration: none;
  font-size: 14px;
  opacity: 0.8;
}
.back-link:hover { opacity: 1; }

.header-row {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 18px;
}
.header-icon {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: rgba(217, 164, 65, 0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  flex-shrink: 0;
}
.title {
  font-family: 'Bitter', serif;
  font-size: 21px;
  margin: 0 0 2px;
  color: #fff;
}
.subtitle {
  font-size: 13px;
  opacity: 0.8;
  margin: 0;
}

.control-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(217, 164, 65, 0.3);
  border-radius: 14px;
  padding: 10px 16px;
  margin-bottom: 18px;
}

.pair-selector { display: flex; gap: 6px; }
.pair-pill {
  border: 1px solid rgba(217, 164, 65, 0.4);
  background: transparent;
  color: #eef0ea;
  border-radius: 999px;
  padding: 5px 12px;
  font-size: 13px;
  font-weight: 700;
  cursor: pointer;
}
.pair-pill.selected,
.pair-pill:hover {
  background: var(--primary);
  border-color: var(--primary);
  color: var(--ink-on-gold);
}

.hud-stats { display: flex; gap: 14px; font-size: 13px; opacity: 0.9; }
.hud-chip strong { font-family: 'JetBrains Mono', monospace; color: var(--primary); }

.restart-btn {
  border: 1px solid rgba(217, 164, 65, 0.4);
  background: transparent;
  color: #eef0ea;
  border-radius: 10px;
  padding: 7px 14px;
  font-size: 13px;
  font-weight: 700;
  cursor: pointer;
}
.restart-btn:hover { background: var(--primary); border-color: var(--primary); color: var(--ink-on-gold); }

.board {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
}

.card {
  aspect-ratio: 1 / 1;
  perspective: 600px;
  cursor: pointer;
}
.card-inner {
  position: relative;
  width: 100%;
  height: 100%;
  transition: transform 0.4s;
  transform-style: preserve-3d;
}
.card.flipped .card-inner,
.card.matched .card-inner {
  transform: rotateY(180deg);
}
.card.matched { cursor: default; }

.card-face {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 10px;
  backface-visibility: hidden;
  font-weight: 700;
  text-align: center;
  padding: 4px;
  word-break: break-word;
}
.card-back {
  background: linear-gradient(160deg, var(--primary), var(--primary-dark));
  font-size: 22px;
  color: var(--ink-on-gold);
}
.card-front {
  background: rgba(0, 0, 0, 0.25);
  border: 2px solid var(--primary);
  transform: rotateY(180deg);
  font-family: 'JetBrains Mono', monospace;
  font-size: 15px;
  color: #fff;
}
.card.matched .card-front {
  border-color: var(--success);
  background: rgba(22, 163, 74, 0.25);
}

.win-banner {
  margin-top: 18px;
  padding: 14px 16px;
  border-radius: 12px;
  background: rgba(22, 163, 74, 0.18);
  border: 1px solid var(--success);
  text-align: center;
  font-size: 14px;
}
.win-banner strong { color: var(--primary); font-family: 'JetBrains Mono', monospace; }
.hidden { display: none; }