:root {
  color-scheme: light;
  --bg-top: #5ed3ff;
  --bg-bottom: #0f6ee8;
  --panel: rgba(9, 53, 140, 0.68);
  --panel-border: rgba(255, 255, 255, 0.24);
  --panel-shadow: rgba(4, 20, 70, 0.28);
  --button-top: #ffd85a;
  --button-bottom: #ff9f1c;
  --button-text: #0f2f87;
  --hole-rim-top: #7edcff;
  --hole-rim-bottom: #1c88f2;
  --hole-center-top: #08378f;
  --hole-center-bottom: #041e55;
  --text-main: #f6fbff;
  --text-soft: #d7edff;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: Arial, Helvetica, sans-serif;
  color: var(--text-main);
  background:
    radial-gradient(circle at top, rgba(255, 255, 255, 0.28), transparent 32%),
    linear-gradient(180deg, var(--bg-top) 0%, #2ca6ff 35%, var(--bg-bottom) 100%);
}

body,
main {
  display: flex;
  flex-direction: column;
  align-items: center;
}

header,
main {
  width: min(100%, 980px);
}

header {
  padding: 32px 20px 16px;
  text-align: center;
}

h1 {
  margin: 0 0 20px;
  font-size: clamp(2.2rem, 4vw, 3.6rem);
  line-height: 1.1;
  text-shadow: 0 4px 18px rgba(6, 31, 91, 0.32);
}

.game-controls {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 14px;
}

.game-controls > * {
  margin: 0;
  padding: 12px 18px;
  border: 1px solid var(--panel-border);
  border-radius: 8px;
  background: var(--panel);
  box-shadow: 0 10px 24px var(--panel-shadow);
  color: var(--text-main);
  font-size: 1rem;
  font-weight: 700;
}

#start-button {
  border: 0;
  cursor: pointer;
  color: var(--button-text);
  background: linear-gradient(180deg, var(--button-top), var(--button-bottom));
  transition: transform 140ms ease, box-shadow 140ms ease;
}

#start-button:hover {
  transform: translateY(-1px);
  box-shadow: 0 12px 24px rgba(84, 46, 0, 0.24);
}

#start-button:active {
  transform: translateY(1px);
}

main {
  padding: 0 20px 40px;
}

#final-message {
  min-height: 1.5em;
  margin: 6px 0 24px;
  color: var(--text-soft);
  font-size: 1.1rem;
  font-weight: 700;
  text-align: center;
}

.game-board {
  width: min(100%, 760px);
  display: grid;
  grid-template-columns: repeat(3, minmax(120px, 1fr));
  gap: 22px;
  padding: 26px;
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: 8px;
  background: linear-gradient(180deg, rgba(8, 58, 149, 0.4), rgba(3, 28, 82, 0.48));
  box-shadow: 0 18px 36px rgba(4, 20, 70, 0.24);
}

.hole {
  position: relative;
  aspect-ratio: 1;
  overflow: hidden;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  background:
    radial-gradient(circle at 50% 35%, var(--hole-rim-top) 0%, var(--hole-rim-bottom) 40%, transparent 41%),
    radial-gradient(circle at 50% 65%, var(--hole-center-top) 0%, var(--hole-center-bottom) 66%);
  box-shadow:
    inset 0 14px 20px rgba(255, 255, 255, 0.2),
    inset 0 -16px 22px rgba(2, 11, 36, 0.46),
    0 14px 24px rgba(5, 22, 72, 0.28);
}

.hole img {
  position: absolute;
  left: 50%;
  top: 110%;
  width: 55%;
  height: 55%;
  border: 4px solid transparent;
  object-fit: cover;
  border-radius: 50%;
  transform: translate(-50%, 0) scale(0);
  opacity: 0;
  transition:
    top 180ms ease-out,
    transform 180ms ease-out,
    opacity 180ms ease-out;
  pointer-events: none;
  user-select: none;
  filter: drop-shadow(0 10px 12px rgba(2, 11, 36, 0.3));
  cursor: pointer;
}

.hole img.hit {
  border-color: #ff3b30;
}

.hole.up img {
  top: 35%;
  transform: translate(-50%, -50%) scale(1);
  opacity: 1;
  pointer-events: auto;
}

@media (max-width: 700px) {
  .game-board {
    grid-template-columns: repeat(2, minmax(120px, 1fr));
  }
}

@media (max-width: 460px) {
  header,
  main {
    width: 100%;
  }

  .game-controls {
    flex-direction: column;
    align-items: stretch;
  }

  .game-board {
    grid-template-columns: repeat(2, minmax(110px, 1fr));
    gap: 16px;
    padding: 18px;
  }
}