:root {
  --bg-top: #7ed7ff;
  --bg-bottom: #f7f5bb;
  --panel: rgba(255, 255, 255, 0.78);
  --panel-border: rgba(255, 255, 255, 0.9);
  --text: #17324d;
  --accent: #ff8a3d;
  --accent-deep: #ff5b3d;
  --mint: #7be0b3;
  --gold: #ffd75d;
  --shadow: rgba(23, 50, 77, 0.18);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Trebuchet MS", "Gill Sans", "Arial Rounded MT Bold", sans-serif;
  color: var(--text);
  background: linear-gradient(180deg, var(--bg-top) 0%, #c9efff 45%, var(--bg-bottom) 100%);
  overflow-x: hidden;
  -webkit-tap-highlight-color: transparent;
}

.sky,
.sun {
  position: fixed;
  pointer-events: none;
}

.sky {
  inset: 0;
  background:
    radial-gradient(circle at 20% 20%, rgba(255, 255, 255, 0.45) 0 5%, transparent 6%),
    radial-gradient(circle at 75% 16%, rgba(255, 255, 255, 0.4) 0 4%, transparent 5%),
    radial-gradient(circle at 68% 32%, rgba(255, 255, 255, 0.3) 0 3.5%, transparent 4.5%);
}

.sun {
  top: 28px;
  right: 36px;
  width: 120px;
  height: 120px;
  border-radius: 50%;
  background: radial-gradient(circle, #fff7ae 0%, #ffd95e 60%, #ffbe3d 100%);
  box-shadow: 0 0 0 16px rgba(255, 223, 98, 0.18);
}

.app {
  position: relative;
  z-index: 1;
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
  padding: 40px 0 48px;
}

.hero {
  text-align: center;
  padding: 16px 18px 20px;
}

.eyebrow {
  margin: 0;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-family: "Avenir Next", "Trebuchet MS", sans-serif;
  font-weight: 800;
  color: #ffffff;
  text-shadow: 0 2px 0 rgba(23, 50, 77, 0.16);
}

h1 {
  margin: 6px 0 10px;
  font-size: clamp(2.5rem, 6vw, 4.6rem);
  line-height: 0.95;
}

.intro {
  width: min(560px, 100%);
  margin: 0 auto;
  font-size: clamp(1.1rem, 2.8vw, 1.4rem);
  line-height: 1.2;
}

.status-panel {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 14px;
  margin-top: 24px;
}

.stat,
.play-button {
  min-width: 124px;
  padding: 12px 18px;
  border-radius: 24px;
  border: 3px solid var(--panel-border);
  background: var(--panel);
  box-shadow: 0 12px 24px -18px var(--shadow);
}

.stat {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.stat-label {
  font-family: "Avenir Next", "Trebuchet MS", sans-serif;
  font-size: 0.88rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.stat strong {
  font-size: 1.9rem;
  line-height: 1;
}

.play-button {
  cursor: pointer;
  font: inherit;
  font-size: 1.2rem;
  font-weight: 700;
  color: #fff;
  background: linear-gradient(180deg, var(--accent) 0%, var(--accent-deep) 100%);
  border-color: rgba(255, 255, 255, 0.75);
  transform: translateY(0);
  transition: transform 160ms ease, box-shadow 160ms ease;
  touch-action: manipulation;
}

.play-button:hover,
.play-button:focus-visible {
  transform: translateY(-2px);
  box-shadow: 0 18px 28px -16px rgba(255, 91, 61, 0.5);
}

.message {
  min-height: 1.6em;
  margin: 18px 0 0;
  font-size: 1.2rem;
  color: #ffffff;
  text-shadow: 0 2px 0 rgba(23, 50, 77, 0.16);
}

.install-hint {
  margin: 8px auto 0;
  width: min(520px, 100%);
  font-size: 1rem;
  line-height: 1.2;
  color: rgba(255, 255, 255, 0.96);
}

.install-button {
  background: linear-gradient(180deg, #34c67a 0%, #17985a 100%);
}

.is-hidden {
  display: none;
}

.board-wrap {
  margin-top: 18px;
  padding: 10px;
}

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

.card {
  position: relative;
  aspect-ratio: 1 / 1.08;
  border: 0;
  padding: 0;
  background: transparent;
  perspective: 1000px;
  cursor: pointer;
  touch-action: manipulation;
}

.card:disabled {
  cursor: default;
}

.card-face {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  border-radius: 28px;
  backface-visibility: hidden;
  transition: transform 480ms ease, box-shadow 240ms ease;
  box-shadow: 0 18px 28px -22px var(--shadow);
}

.card-front {
  background:
    radial-gradient(circle at top, rgba(255, 255, 255, 0.55), transparent 42%),
    linear-gradient(180deg, #ffb84c 0%, #ff8a3d 100%);
  border: 4px solid rgba(255, 255, 255, 0.72);
}

.card-front-badge {
  display: inline-grid;
  place-items: center;
  width: 72px;
  height: 72px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.2);
  color: #fffdf5;
  font-family: "Avenir Next", "Trebuchet MS", sans-serif;
  font-size: 2.6rem;
  font-weight: 800;
}

.card-back {
  gap: 8px;
  padding: 14px;
  background: linear-gradient(180deg, #ffffff 0%, #eafff7 100%);
  border: 4px solid rgba(123, 224, 179, 0.52);
  transform: rotateY(180deg);
}

.card-image {
  width: 100%;
  max-width: 114px;
  aspect-ratio: 1 / 1;
  object-fit: contain;
  filter: drop-shadow(0 10px 8px rgba(23, 50, 77, 0.12));
}

.card-name {
  font-family: "Avenir Next", "Trebuchet MS", sans-serif;
  font-size: 1rem;
  font-weight: 800;
  text-transform: capitalize;
}

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

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

.card.is-flipped .card-face,
.card:hover .card-face,
.card:focus-visible .card-face {
  box-shadow: 0 22px 32px -22px rgba(23, 50, 77, 0.35);
}

.card.is-matched .card-back {
  background: linear-gradient(180deg, #fffdea 0%, #d9ffe3 100%);
  border-color: rgba(255, 215, 93, 0.82);
  animation: bounce 520ms ease;
}

@keyframes bounce {
  0% { transform: rotateY(360deg) scale(1); }
  40% { transform: rotateY(360deg) scale(1.06); }
  100% { transform: rotateY(360deg) scale(1); }
}

@media (max-width: 820px) {
  .app {
    width: min(100% - 20px, 760px);
    padding-top: 28px;
  }

  .board {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 560px) {
  body {
    min-height: 100dvh;
  }

  .sun {
    width: 84px;
    height: 84px;
    top: 18px;
    right: 18px;
  }

  .hero {
    padding-inline: 6px;
  }

  .status-panel {
    gap: 10px;
  }

  .stat,
  .play-button {
    min-width: calc(50% - 8px);
    padding: 11px 14px;
  }

  .message {
    font-size: 1.05rem;
  }

  .install-hint {
    font-size: 0.95rem;
  }

  .board {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
  }

  .card-front-badge {
    width: 62px;
    height: 62px;
    font-size: 2.2rem;
  }

  .card-back {
    padding: 10px;
  }

  .card-image {
    max-width: 88px;
  }

  .card-name {
    font-size: 0.92rem;
  }
}