:root {
  --bgTop: #0d1726;
  --bgBottom: #19354e;
  --panel: rgba(10, 21, 34, 0.9);
  --line: rgba(255, 255, 255, 0.14);
  --text: #edf3e8;
  --muted: #bcc8c2;
  --accentA: #ffbe0b;
  --accentB: #fb5607;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: Verdana, "Trebuchet MS", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at 12% 0%, rgba(255, 190, 11, 0.2), transparent 34%),
    linear-gradient(180deg, var(--bgTop), var(--bgBottom));
}

.homeLink {
  display: inline-block;
  margin: 10px 14px 0;
  padding: 8px 12px;
  border-radius: 999px;
  text-decoration: none;
  color: var(--text);
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.shell {
  width: min(1180px, calc(100vw - 20px));
  margin: 0 auto;
  padding: 10px 0 18px;
  display: grid;
  grid-template-columns: 300px minmax(0, 1fr);
  gap: 16px;
  align-items: start;
}

.panel,
.boardWrap {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 18px;
  box-shadow: 0 16px 34px rgba(0, 0, 0, 0.28);
}

.panel {
  padding: 18px;
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--accentA);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  font-size: 0.72rem;
}

h1,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 10px;
  font-size: clamp(1.8rem, 5vw, 2.7rem);
  line-height: 0.95;
}

.intro {
  color: var(--muted);
  line-height: 1.5;
}

.modeRow {
  display: grid;
  gap: 6px;
  margin-top: 12px;
}

.modeRow label {
  font-size: 0.74rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
}

.modeSelect {
  width: 100%;
  border-radius: 10px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  background: rgba(255, 255, 255, 0.1);
  color: var(--text);
  font: inherit;
  padding: 10px 12px;
}

.statusCard {
  margin: 14px 0;
  padding: 12px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.06);
}

.statusCard p {
  margin: 0 0 6px;
  line-height: 1.38;
}

.statusCard p:last-child {
  margin-bottom: 0;
}

.buttons {
  display: grid;
  gap: 10px;
}

.button {
  width: 100%;
  border: 0;
  border-radius: 999px;
  padding: 12px 14px;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
}

.button.primary {
  color: #16222e;
  background: linear-gradient(130deg, var(--accentA), var(--accentB));
}

.button.secondary {
  color: var(--text);
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.16);
}

.boardWrap {
  padding: 12px;
}

.board {
  width: min(92vw, 700px);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px;
}

.card {
  border: 0;
  border-radius: 14px;
  aspect-ratio: 4 / 5;
  cursor: pointer;
  position: relative;
  transform-style: preserve-3d;
  transition: transform 200ms ease;
  background: transparent;
  padding: 0;
}

.cardFace {
  position: absolute;
  inset: 0;
  border-radius: 14px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  display: grid;
  place-items: center;
  font-size: clamp(1.15rem, 2.8vw, 2rem);
  font-weight: 800;
  backface-visibility: hidden;
}

.cardBack {
  background: linear-gradient(150deg, #3d89ff, #5d5fef);
  color: #f3f7ff;
  letter-spacing: 0.08em;
}

.cardFront {
  transform: rotateY(180deg);
  background: linear-gradient(150deg, #fff6e1, #f4e8c9);
  color: #263140;
}

.card.flipped {
  transform: rotateY(180deg);
}

.card.matched .cardFront {
  background: linear-gradient(150deg, #a5f3ca, #6ee7b7);
}

.card:disabled {
  cursor: default;
}

@media (max-width: 940px) {
  .shell {
    grid-template-columns: 1fr;
  }

  .board {
    width: min(95vw, 560px);
    gap: 8px;
  }
}