:root {
  color-scheme: dark;
  --text: #e9edf2;
  --muted: #9ba3ad;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: #C8C4C0;
  font-family: "Segoe UI", Roboto, Inter, Arial, sans-serif;
  color: var(--text);
}

#app {
  position: relative;
  width: 100%;
  height: 100%;
}

#game-canvas {
  display: block;
  width: 100%;
  height: 100%;
  touch-action: none;
}

/* ── Centered score display ─────────────────────────────────────────────── */
#score-display {
  position: absolute;
  top: 95px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 5;           /* floats above overlay */
  text-align: center;
  pointer-events: none;
  user-select: none;
}

#score-num {
  font-size: clamp(3rem, 9vw, 5.5rem);
  font-weight: 200;
  line-height: 1;
  letter-spacing: -0.04em;
  /* Dark, readable against the warm-gray canvas */
  color: rgba(28, 26, 38, 0.80);
  text-shadow: 0 1px 0 rgba(255, 255, 255, 0.18);
  transition: transform 0.12s ease;
}

/* ── Overlay (start / game-over screens) ────────────────────────────────── */
#overlay {
  position: absolute;
  inset: 0;
  display: none;
  z-index: 4;
  flex-direction: column;
  justify-content: flex-start;
  padding-top: clamp(110px, 24vh, 200px);
  align-items: center;
  text-align: center;
  gap: 10px;
  /* Light semi-transparent veil — lets canvas show through */
  background: linear-gradient(
    to bottom,
    rgba(200, 196, 192, 0.08) 0%,
    rgba(200, 196, 192, 0.38) 50%,
    rgba(200, 196, 192, 0.10) 100%
  );
}

#overlay.visible {
  display: flex;
}

#overlay h1 {
  margin: 0;
  font-weight: 600;
  font-size: clamp(1.4rem, 3.5vw, 2.4rem);
  color: rgba(28, 26, 38, 0.88);
  letter-spacing: -0.01em;
}

#overlay p {
  margin: 0;
  font-size: clamp(0.9rem, 2vw, 1.15rem);
  color: rgba(40, 38, 54, 0.60);
}

#overlay .action {
  margin-top: 8px;
  font-size: clamp(0.8rem, 1.6vw, 1rem);
  color: rgba(40, 38, 54, 0.45);
}

/* ── Audio mute button ──────────────────────────────────────────────────── */
#audio-btn {
  position: absolute;
  bottom: clamp(14px, 3vh, 28px);
  right: clamp(14px, 3vw, 28px);
  z-index: 10;
  width: 40px;
  height: 40px;
  border: none;
  border-radius: 50%;
  background: rgba(28, 26, 38, 0.55);
  backdrop-filter: blur(6px);
  color: rgba(233, 237, 242, 0.80);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  transition: background 0.15s, transform 0.12s;
}

#audio-btn:hover {
  background: rgba(28, 26, 38, 0.80);
  transform: scale(1.08);
}

#audio-btn svg {
  width: 20px;
  height: 20px;
  display: block;
}