body {
  min-width: 320px;
  min-height: 100vh;
}

.page-shell {
  display: grid;
  min-height: 100vh;
  padding: 28px;
  place-items: center;
}

.game-card {
  position: relative;
  width: min(100%, 690px);
  padding: clamp(26px, 5vw, 46px);
  border: 1px solid var(--line);
  border-radius: 34px;
  background: linear-gradient(135deg, var(--surface), #f7f1e4);
  box-shadow: var(--shadow);
  text-align: center;
}

.game-navigation {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 32px;
}

.game-navigation .brand-lock {
  gap: 8px;
  text-align: left;
}

.game-navigation .brand-mark {
  width: 38px;
  height: 38px;
  font-size: 21px;
}

.game-navigation .brand-name {
  font-size: 1.05rem;
}

.game-navigation .brand-name small {
  font-size: 0.53rem;
}

.back-link {
  color: var(--navy);
  font: 800 0.82rem var(--sans);
  text-decoration: none;
}

.back-link:hover {
  color: var(--gold-dark);
  text-decoration: underline;
}

h1,
h2,
p {
  margin-top: 0;
}

h1,
h2 {
  color: var(--navy);
  font-family: var(--serif);
}

h1 {
  margin-bottom: 10px;
  font-size: clamp(2.25rem, 7vw, 3.7rem);
  line-height: 1;
}

h2 {
  font-size: clamp(1.7rem, 5vw, 2.35rem);
  line-height: 1.08;
}

.intro {
  max-width: 450px;
  margin: 0 auto 28px;
  color: #3e4142;
  font-size: 1.06rem;
  line-height: 1.55;
}

.start-screen {
  text-align: left;
}

.difficulty-options {
  display: grid;
  gap: 12px;
}

.difficulty-option {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 4px 16px;
  width: 100%;
  padding: 17px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  color: var(--navy);
  background: rgba(255, 253, 246, 0.88);
  cursor: pointer;
  text-align: left;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
  transition: border-color 180ms ease, box-shadow 180ms ease, transform 180ms ease;
}

.difficulty-option:hover {
  border-color: var(--gold);
  box-shadow: var(--soft);
  transform: translateY(-2px);
}

.difficulty-option:focus-visible {
  outline: 3px solid var(--gold-2);
  outline-offset: 3px;
}

.difficulty-option:nth-child(2) {
  background: linear-gradient(135deg, var(--gold-soft), #fffaf0);
  border-color: #c8ba78;
}

.difficulty-option:nth-child(3) {
  color: var(--white);
  background: linear-gradient(145deg, var(--navy), var(--navy-3));
  border-color: var(--navy-3);
}

.difficulty-option span {
  font: 900 0.74rem var(--sans);
  letter-spacing: 0.11em;
  text-transform: uppercase;
}

.difficulty-option strong {
  grid-column: 2;
  grid-row: 1 / span 2;
  align-self: center;
  font: 800 1.3rem var(--serif);
}

.difficulty-option small {
  color: var(--muted);
  font: 0.88rem var(--serif);
}

.difficulty-option:nth-child(3) small {
  color: #dbe4eb;
}

.game-area[hidden],
.start-screen[hidden] {
  display: none;
}

.selected-level {
  display: inline-flex;
  margin-bottom: 10px;
  padding: 7px 11px;
  border: 1px solid #d4c889;
  border-radius: 999px;
  color: var(--navy);
  background: var(--gold-soft);
  font: 800 0.73rem var(--sans);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.game-status {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  margin-bottom: 24px;
}

.game-status p {
  margin: 0;
  padding: 12px 8px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: rgba(255, 253, 246, 0.75);
  color: var(--muted);
  font: 800 0.72rem var(--sans);
  text-transform: uppercase;
}

.game-status strong {
  color: var(--navy);
}

.game-board {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: clamp(9px, 2vw, 14px);
}

.memory-card {
  position: relative;
  aspect-ratio: 1;
  padding: 0;
  border: 0;
  border-radius: var(--radius-sm);
  cursor: pointer;
  perspective: 800px;
  background: transparent;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
}

.card-face {
  position: absolute;
  inset: 0;
  display: grid;
  border-radius: inherit;
  place-items: center;
  backface-visibility: hidden;
  transition: transform 260ms ease, background 180ms ease;
}

.card-front {
  background: linear-gradient(145deg, var(--navy), var(--navy-3));
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.14);
}

.card-front::before {
  width: 29%;
  height: 29%;
  border: 2px solid var(--gold-2);
  border-radius: 50%;
  box-shadow: 0 0 0 7px rgba(168, 149, 76, 0.1);
  content: "";
}

.card-back {
  transform: rotateY(180deg);
  background: var(--surface);
  box-shadow: inset 0 0 0 1px var(--line);
  color: var(--navy);
  font-size: clamp(2.45rem, 13vw, 4.75rem);
  line-height: 1;
}

.memory-card.is-open .card-front,
.memory-card.is-matched .card-front {
  transform: rotateY(180deg);
}

.memory-card.is-open .card-back,
.memory-card.is-matched .card-back {
  transform: rotateY(360deg);
}

.memory-card.is-matched .card-back {
  background: var(--gold-soft);
}

.memory-card:disabled {
  cursor: default;
}

.game-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  margin-top: 28px;
}

.button {
  min-height: 46px;
  padding: 12px 18px;
  border-radius: 999px;
  cursor: pointer;
  transition: transform 180ms ease, background 180ms ease;
}

.button:hover {
  transform: translateY(-2px);
}

.button-primary {
  color: #071523;
  background: var(--gold-2);
}

.button-primary:hover {
  background: var(--gold);
}

.button-secondary {
  border-color: var(--line);
  color: var(--navy);
  background: var(--surface);
}

.button-secondary:hover {
  background: var(--navy-soft);
}

.button-tertiary {
  border-color: transparent;
  color: var(--navy);
  background: transparent;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.feedback {
  min-height: 1.25rem;
  margin: 14px 0 0;
  color: var(--gold-dark);
  font: 800 0.86rem var(--sans);
}

.victory-dialog {
  width: min(calc(100% - 32px), 440px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.victory-dialog::backdrop {
  background: rgba(3, 12, 22, 0.78);
}

.victory-content {
  padding: 34px;
  text-align: center;
}

@media (max-width: 430px) {
  .page-shell {
    padding: 12px;
  }

  .game-card {
    border-radius: 22px;
  }

  .game-navigation {
    flex-direction: column-reverse;
    align-items: center;
    margin-bottom: 26px;
  }

  .game-status p {
    font-size: 0.62rem;
  }

  .game-actions .button {
    width: 100%;
    min-height: 52px;
  }
}