* {
  box-sizing: border-box;
}

:root {
  color-scheme: dark;
}

body {
  margin: 0;
  font-family: "Inter", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: radial-gradient(circle at top, #10172f 0%, #060813 70%);
  color: #e7ecff;
  min-height: 100vh;
  display: grid;
  place-items: center;
}

.app {
  width: min(96vw, 980px);
  display: grid;
  gap: 0.85rem;
}

.hud {
  display: grid;
  grid-template-columns: repeat(4, minmax(100px, 1fr));
  gap: 0.75rem;
}

.hud-item {
  background: rgba(140, 167, 255, 0.14);
  border: 1px solid rgba(158, 181, 255, 0.45);
  border-radius: 10px;
  padding: 0.55rem 0.8rem;
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  backdrop-filter: blur(3px);
}

.label {
  color: #b8c6ff;
  font-size: 0.86rem;
}

#score,
#best-score,
#level,
#lives {
  font-size: 1.3rem;
  font-weight: 700;
}

.game-wrap {
  position: relative;
}

canvas {
  width: 100%;
  height: auto;
  border-radius: 16px;
  border: 1px solid rgba(175, 192, 255, 0.45);
  box-shadow: 0 24px 70px rgba(8, 14, 35, 0.65);
  background: linear-gradient(180deg, #0f1a3b 0%, #090f27 100%);
}

.overlay {
  position: absolute;
  inset: 0;
  display: grid;
  place-content: center;
  justify-items: center;
  text-align: center;
  gap: 0.8rem;
  background: rgba(5, 8, 20, 0.84);
  border-radius: 16px;
  padding: 1.5rem;
}

.overlay.is-hidden {
  display: none;
}

.overlay h1 {
  margin: 0;
  font-size: clamp(1.8rem, 4vw, 2.8rem);
}

.overlay p {
  margin: 0;
  max-width: 56ch;
  color: #c7d2ff;
}

button {
  border: none;
  border-radius: 999px;
  padding: 0.72rem 1.2rem;
  font-size: 0.96rem;
  font-weight: 600;
  background: linear-gradient(120deg, #66a5ff, #735eff);
  color: #f7f9ff;
  cursor: pointer;
  transition: transform 140ms ease, filter 140ms ease;
}

button:hover {
  transform: translateY(-1px);
  filter: brightness(1.08);
}

kbd {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  background: #283357;
  padding: 0.1rem 0.4rem;
  border-radius: 4px;
  border: 1px solid #56639a;
}