:root {
  color-scheme: dark;
  --ink: #ecfbfb;
  --muted: #9dc0c1;
  --panel: #163640;
  --panel-deep: #102a33;
  --line: rgba(185, 240, 235, 0.2);
  --aqua: #aaf0e3;
  --pink: #f8a9bc;
  --yellow: #f9d986;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-width: 320px;
  min-height: 100vh;
  overflow-x: hidden;
  background:
    radial-gradient(circle at 50% -10%, rgba(93, 192, 182, 0.25), transparent 42%),
    #0d222a;
  color: var(--ink);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

button,
a {
  font: inherit;
}

button {
  cursor: pointer;
}

.shell {
  display: grid;
  min-height: 100vh;
  place-items: center;
  padding: 26px 16px;
}

.game {
  position: relative;
  width: min(100%, 540px);
  min-height: 720px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 30px;
  background: linear-gradient(145deg, rgba(26, 63, 72, 0.96), rgba(11, 29, 37, 0.98));
  box-shadow: 0 28px 80px rgba(0, 0, 0, 0.32);
}

.topbar,
.scorebar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 22px;
  color: var(--muted);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.topbar strong {
  color: var(--aqua);
  font-size: 0.68rem;
}

.back-link,
.hub-link {
  color: var(--muted);
  text-decoration: none;
}

.back-link:hover,
.hub-link:hover {
  color: var(--ink);
}

.scorebar {
  gap: 14px;
  justify-content: flex-start;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.scorebar span {
  display: grid;
  gap: 5px;
  min-width: 104px;
}

.scorebar small {
  color: var(--muted);
  font-size: 0.63rem;
}

.scorebar strong {
  color: var(--ink);
  font-size: 1.04rem;
  letter-spacing: 0.08em;
}

.board {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
  padding: 28px 22px 12px;
  transition: transform 120ms ease;
}

.board--miss {
  animation: board-shake 320ms ease;
}

.memory-card {
  aspect-ratio: 0.82;
  min-width: 0;
  padding: 0;
  border: 0;
  border-radius: 16px;
  background: transparent;
  perspective: 700px;
}

.memory-card__inner {
  position: relative;
  display: block;
  width: 100%;
  height: 100%;
  border-radius: inherit;
  transform-style: preserve-3d;
  transition: transform 360ms cubic-bezier(0.2, 0.75, 0.25, 1);
}

.memory-card.is-flipped .memory-card__inner {
  transform: rotateY(180deg);
}

.memory-card__front,
.memory-card__back {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  border-radius: inherit;
  backface-visibility: hidden;
}

.memory-card__front {
  border: 1px solid rgba(170, 240, 227, 0.22);
  background:
    linear-gradient(135deg, rgba(170, 240, 227, 0.14), transparent 58%),
    var(--panel-deep);
  color: rgba(170, 240, 227, 0.75);
  font-size: 1.5rem;
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.03);
}

.memory-card__back {
  gap: 8px;
  padding: 10px;
  transform: rotateY(180deg);
  border: 1px solid rgba(249, 217, 134, 0.38);
  background: linear-gradient(150deg, #25535b, #1a3c48);
  color: var(--yellow);
  text-align: center;
}

.memory-card__back b {
  display: block;
  font-size: clamp(1.55rem, 7vw, 2.5rem);
  line-height: 1;
}

.memory-card__back small {
  color: var(--ink);
  font-size: clamp(0.57rem, 2vw, 0.68rem);
  letter-spacing: 0.02em;
  line-height: 1.15;
}

.memory-card.is-matched .memory-card__back {
  border-color: var(--aqua);
  box-shadow: 0 0 0 2px rgba(170, 240, 227, 0.15), 0 0 24px rgba(170, 240, 227, 0.2);
}

.status {
  min-height: 24px;
  margin: 0 22px;
  color: var(--muted);
  font-size: 0.88rem;
  text-align: center;
}

.overlay {
  position: absolute;
  inset: 0;
  z-index: 2;
  display: grid;
  place-items: center;
  padding: 28px;
  background: rgba(9, 25, 32, 0.84);
  opacity: 0;
  pointer-events: none;
  transition: opacity 180ms ease;
}

.overlay--visible {
  opacity: 1;
  pointer-events: auto;
}

.card {
  width: min(100%, 365px);
  padding: 34px 28px 30px;
  border: 1px solid rgba(170, 240, 227, 0.22);
  border-radius: 24px;
  background: linear-gradient(145deg, #1d4650, #112b35);
  box-shadow: 0 24px 70px rgba(0, 0, 0, 0.34);
  text-align: center;
}

.hero {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-bottom: 25px;
}

.hero span {
  display: grid;
  width: 38px;
  height: 38px;
  place-items: center;
  border: 1px solid rgba(170, 240, 227, 0.25);
  border-radius: 12px;
  color: var(--yellow);
  font-size: 1.1rem;
  background: rgba(170, 240, 227, 0.1);
  transform: rotate(-8deg);
}

.hero span:nth-child(2n) {
  color: var(--pink);
  transform: rotate(8deg) translateY(8px);
}

.kicker {
  margin: 0 0 14px;
  color: var(--aqua);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

h1,
h2 {
  margin: 0;
  color: var(--ink);
  font-size: clamp(2.6rem, 11vw, 4rem);
  letter-spacing: -0.08em;
  line-height: 0.95;
}

h1 em {
  color: var(--pink);
  font-family: Georgia, serif;
  font-weight: 400;
}

h2 {
  font-size: clamp(2.2rem, 9vw, 3.2rem);
}

.card p:not(.kicker) {
  margin: 22px auto 26px;
  max-width: 29ch;
  color: var(--muted);
  line-height: 1.55;
}

.card > small {
  display: block;
  margin-top: 14px;
  color: var(--muted);
  font-size: 0.72rem;
}

.primary {
  width: 100%;
  border: 1px solid var(--aqua);
  border-radius: 999px;
  padding: 14px 18px;
  background: var(--aqua);
  color: #143640;
  font-weight: 800;
  transition: transform 160ms ease, box-shadow 160ms ease;
}

.primary:hover {
  box-shadow: 0 10px 30px rgba(170, 240, 227, 0.18);
  transform: translateY(-2px);
}

.hub-link {
  display: block;
  margin-top: 26px;
  font-size: 0.78rem;
}

.seal {
  display: grid;
  width: 54px;
  height: 54px;
  margin: 0 auto 22px;
  place-items: center;
  border: 1px solid var(--aqua);
  border-radius: 50%;
  color: var(--aqua);
  font-size: 1.35rem;
}

.result {
  display: flex;
  justify-content: center;
  gap: 26px;
  margin: 4px 0 24px;
  color: var(--muted);
  font-size: 0.68rem;
  letter-spacing: 0.13em;
}

.result b {
  display: block;
  margin-top: 6px;
  color: var(--yellow);
  font-size: 1.1rem;
  letter-spacing: 0.08em;
}

@keyframes board-shake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-5px); }
  75% { transform: translateX(5px); }
}

@media (max-width: 430px) {
  .shell {
    padding: 10px;
  }

  .game {
    min-height: calc(100vh - 20px);
    border-radius: 24px;
  }

  .topbar,
  .scorebar {
    padding-inline: 16px;
  }

  .board {
    gap: 8px;
    padding-inline: 16px;
  }

  .memory-card__back {
    gap: 4px;
    padding: 5px;
  }
}