:root {
  color-scheme: dark;
  --bg: #101820;
  --panel: #1d2b38;
  --ink: #edf4ff;
  --accent: #ffd166;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Verdana", "Segoe UI", sans-serif;
  color: var(--ink);
  background: linear-gradient(170deg, #1f2f3f, var(--bg));
}

.wrap { max-width: 880px; margin: 0 auto; padding: 18px; }
.top { display: flex; justify-content: space-between; gap: 10px; align-items: center; }
.top h1 { margin: 0; }
.top p { margin: 4px 0 0; opacity: 0.85; }

button {
  border: 0;
  border-radius: 10px;
  padding: 10px 14px;
  font-weight: 700;
  background: var(--accent);
  color: #2d2100;
  cursor: pointer;
}

.hud {
  margin: 14px 0;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}

.hud div {
  background: var(--panel);
  border-radius: 12px;
  padding: 10px 12px;
  border: 1px solid #34485b;
}

.hud span { display: block; font-size: 0.8rem; opacity: 0.8; }

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

.card {
  border-radius: 12px;
  border: 1px solid #3a4e63;
  min-height: 92px;
  background: #25384b;
  color: #f4f8ff;
  font-size: 2rem;
  cursor: pointer;
  display: grid;
  place-content: center;
}

.card.revealed,
.card.matched {
  background: #15222f;
}

.card.matched {
  outline: 2px solid #5edca9;
}

.status { margin-top: 10px; min-height: 24px; opacity: 0.92; }

@media (max-width: 640px) {
  .board { grid-template-columns: repeat(3, 1fr); }
  .hud { grid-template-columns: 1fr; }
}