:root {
  --bg-a: #13243b;
  --bg-b: #0e4f4f;
  --bg-c: #f4b15f;
  --ink: #10202d;
  --card: rgba(255, 247, 230, 0.82);
  --accent: #ff6a3d;
  --good: #1a9e72;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  place-items: center;
  background:
    radial-gradient(circle at 20% 10%, #ffffff33 0 22%, transparent 23%),
    radial-gradient(circle at 82% 90%, #ffffff2b 0 18%, transparent 19%),
    linear-gradient(130deg, var(--bg-a), var(--bg-b), var(--bg-c));
  color: var(--ink);
  font-family: "Baloo 2", "Segoe UI", Tahoma, sans-serif;
}

.game-shell {
  width: min(94vw, 640px);
  padding: 1rem 1rem 1.2rem;
  border-radius: 24px;
  background: var(--card);
  backdrop-filter: blur(8px);
  box-shadow: 0 18px 40px #0000003a;
}

h1 {
  margin: 0;
  font-size: clamp(1.9rem, 4vw, 2.6rem);
  line-height: 1;
}

.subtitle {
  margin: 0.1rem 0 0.8rem;
  font-size: 1rem;
}

.hud {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  align-items: center;
  margin-bottom: 0.7rem;
}

.stat {
  background: #fff;
  padding: 0.3rem 0.7rem;
  border-radius: 999px;
  font-size: 1.03rem;
}

#start-btn {
  margin-left: auto;
  border: 0;
  border-radius: 999px;
  padding: 0.38rem 1rem;
  font-weight: 700;
  background: var(--accent);
  color: #fff;
  cursor: pointer;
  transition: transform 130ms ease, filter 130ms ease;
}

#start-btn:hover {
  transform: translateY(-1px) scale(1.02);
  filter: brightness(1.08);
}

.board-wrap {
  position: relative;
  border-radius: 14px;
  overflow: hidden;
}

#board {
  width: 100%;
  aspect-ratio: 1;
  background:
    repeating-linear-gradient(0deg, #f4ffe5 0 25px, #eeffd9 25px 50px),
    repeating-linear-gradient(90deg, #f4ffe5 0 25px, #eeffd9 25px 50px);
  display: block;
}

.overlay {
  position: absolute;
  inset: 0;
  display: grid;
  place-content: center;
  text-align: center;
  gap: 0.1rem;
  background: #0f1f2b8a;
  color: #fff;
  font-weight: 700;
}

.overlay.hidden {
  display: none;
}

.overlay-title {
  margin: 0;
  font-size: 1.6rem;
}

.overlay p {
  margin: 0;
}

@media (max-width: 520px) {
  .game-shell {
    padding: 0.8rem;
  }

  .hud {
    gap: 0.45rem;
  }

  #start-btn {
    width: 100%;
    margin-left: 0;
  }
}