* { box-sizing: border-box; }

:root {
  --red: #A31A1B;
  --red-dark: #861617;
  --text: #242424;
  --muted: #6d6d6d;
  --line: #dedbd5;
  --page: #f7f6f3;
  --white: #fff;
}

html { background: var(--page); }

body {
  margin: 0;
  color: var(--text);
  background: var(--page);
  font-family: Arial, Helvetica, sans-serif;
}

.memory-wrap {
  width: min(1160px, calc(100% - 40px));
  margin: 0 auto;
  padding: 54px 0 70px;
}

.memory-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 32px;
}

.eyebrow,
.message-eyebrow {
  margin: 0 0 7px;
  color: var(--red);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .18em;
  text-transform: uppercase;
}

h1 {
  margin: 0;
  font-size: clamp(42px, 6vw, 68px);
  line-height: .92;
  font-weight: 700;
  letter-spacing: -.025em;
}

.heading p {
  margin: 13px 0 0;
  font-size: 17px;
  line-height: 1.5;
}

.button {
  flex: 0 0 auto;
  border: 0;
  border-radius: 2px;
  padding: 13px 20px;
  background: var(--red);
  color: #fff;
  font: inherit;
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
  transition: background .2s ease, transform .15s ease;
}

.button:hover {
  background: var(--red-dark);
}

.button:active {
  transform: translateY(1px);
}

.rule {
  height: 1px;
  margin: 27px 0 18px;
  background: var(--line);
}

.game-info {
  display: flex;
  justify-content: flex-end;
  gap: 30px;
  margin-bottom: 18px;
  color: var(--muted);
}

.game-info div {
  min-width: 72px;
}

.game-info span {
  display: block;
  margin-bottom: 2px;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: .12em;
  text-transform: uppercase;
}

.game-info strong {
  color: var(--text);
  font-size: 18px;
  font-weight: 700;
}

.board {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 12px;
  width: 100%;
}

.card {
  display: block;
  width: 100%;
  min-width: 0;
  aspect-ratio: 1;
  padding: 0;
  margin: 0;
  border: 0;
  background: transparent;
  cursor: pointer;
  perspective: 900px;
  appearance: none;
  -webkit-appearance: none;
}

.card-inner {
  display: block;
  position: relative;
  width: 100%;
  height: 100%;
  transform-style: preserve-3d;
  transition: transform .42s cubic-bezier(.2,.7,.2,1);
}

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

.card-front,
.card-back {
  position: absolute;
  inset: 0;
  display: block;
  width: 100%;
  height: 100%;
  overflow: hidden;
  border-radius: 2px;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
}

.card-back {
  background: #fff url("pics/HdS_Logo_rot.png") center / 58% auto no-repeat;
  border: 1px solid #d5d1ca;
  box-shadow: 0 2px 8px rgba(0,0,0,.07);
}

.card-back::after {
  content: "";
  position: absolute;
  inset: 7px;
  border: 1px solid rgba(163,26,27,.22);
  pointer-events: none;
}

.card-front {
  transform: rotateY(180deg);
  background: #fff;
  border: 1px solid #d5d1ca;
  box-shadow: 0 2px 8px rgba(0,0,0,.07);
}

.card-front img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.card:hover .card-back {
  border-color: var(--red);
}

.card.matched .card-front {
  border: 2px solid var(--red);
}

.message {
  max-width: 560px;
  margin: 30px auto 0;
  padding: 34px;
  text-align: center;
  background: var(--white);
  border: 1px solid var(--line);
}

.message h2 {
  margin: 0 0 9px;
  font-size: 34px;
}

.message p {
  margin: 0 0 22px;
  line-height: 1.5;
}

.hidden { display: none; }

@media (max-width: 800px) {
  .memory-wrap {
    width: min(94%, 620px);
    padding-top: 34px;
  }

  .memory-header {
    align-items: flex-start;
    flex-direction: column;
    gap: 20px;
  }

  .button {
    width: auto;
  }

  .board {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 9px;
  }

  .game-info {
    justify-content: flex-start;
    gap: 25px;
  }
}

@media (max-width: 460px) {
  .memory-wrap {
    width: calc(100% - 24px);
    padding-top: 25px;
    padding-bottom: 40px;
  }

  h1 { font-size: 42px; }

  .heading p { font-size: 15px; }

  .board { gap: 6px; }

  .game-info {
    gap: 19px;
    margin-bottom: 13px;
  }

  .game-info strong { font-size: 16px; }

  .card-back { background-size: 62% auto; }

  .card-back::after { inset: 4px; }
}