:root {
  --color-bg: #6ec6e8;
  --color-text: #ffffff;
  --color-accent: #ff5a3c;
  --color-overlay: rgba(20, 40, 60, 0.55);
  --font-stack: 'Arial Black', 'Helvetica Neue', Arial, sans-serif;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html, body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: var(--color-bg);
  font-family: var(--font-stack);
  touch-action: manipulation;
  -webkit-user-select: none;
  user-select: none;
}

#game-container {
  position: relative;
  width: 100%;
  height: 100%;
}

#game-canvas {
  display: block;
  width: 100%;
  height: 100%;
}

/* ---------- HUD ---------- */
.hud {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  padding: 18px 22px;
  pointer-events: none;
}

.hud__score {
  font-size: 56px;
  font-weight: 900;
  color: var(--color-text);
  text-shadow: 0 3px 0 rgba(0, 0, 0, 0.35);
  line-height: 1;
}

.hud__mute {
  pointer-events: auto;
  background: rgba(0, 0, 0, 0.25);
  border: none;
  border-radius: 10px;
  font-size: 22px;
  width: 46px;
  height: 46px;
  cursor: pointer;
  color: var(--color-text);
}

.hud__mute:hover {
  background: rgba(0, 0, 0, 0.4);
}

/* ---------- Overlays ---------- */
.overlay {
  position: absolute;
  inset: 0;
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 26px;
  background: var(--color-overlay);
  text-align: center;
  z-index: 10;
}

.overlay--visible {
  display: flex;
}

.overlay__title {
  font-size: clamp(40px, 8vw, 76px);
  font-weight: 900;
  color: var(--color-text);
  letter-spacing: 2px;
  text-shadow: 0 5px 0 rgba(0, 0, 0, 0.35);
  line-height: 1.05;
}

.overlay__title--small {
  font-size: clamp(34px, 6vw, 58px);
}

.overlay__hint {
  font-family: Arial, sans-serif;
  font-size: 16px;
  color: var(--color-text);
  text-shadow: 0 2px 0 rgba(0, 0, 0, 0.3);
}

.overlay__btn {
  font-family: var(--font-stack);
  font-size: 24px;
  font-weight: 900;
  letter-spacing: 1px;
  color: var(--color-text);
  background: var(--color-accent);
  border: none;
  border-radius: 12px;
  padding: 16px 44px;
  cursor: pointer;
  box-shadow: 0 6px 0 #c23a22;
  transition: transform 0.08s ease, box-shadow 0.08s ease;
}

.overlay__btn:hover {
  transform: translateY(2px);
  box-shadow: 0 4px 0 #c23a22;
}

.overlay__btn:active {
  transform: translateY(6px);
  box-shadow: 0 0 0 #c23a22;
}

.overlay__score-block {
  color: var(--color-text);
}

.overlay__score-label {
  font-size: 16px;
  letter-spacing: 3px;
  opacity: 0.85;
}

.overlay__score {
  font-size: 64px;
  font-weight: 900;
  text-shadow: 0 4px 0 rgba(0, 0, 0, 0.35);
  margin-bottom: 14px;
}

.overlay__best {
  font-size: 36px;
  font-weight: 900;
  text-shadow: 0 3px 0 rgba(0, 0, 0, 0.35);
}