:root {
  --cyan: #7df5ff;
  --gold: #ffd166;
  --dim: rgba(180, 210, 230, 0.55);
  --hud-font: "Rajdhani", "Segoe UI", "Ubuntu", system-ui, sans-serif;
}

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

html, body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: #000;
  user-select: none;
  -webkit-user-select: none;
}

body.idle { cursor: none; }

#scene {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
}

#hud {
  position: fixed;
  inset: 0;
  pointer-events: none;
  font-family: var(--hud-font);
  color: var(--cyan);
  user-select: none;
  text-transform: uppercase;
}

/* ---- score (top left) ---- */
#score-panel {
  position: absolute;
  top: 28px;
  left: 36px;
  opacity: 0;
  transition: opacity 0.6s ease;
}
body.playing #score-panel { opacity: 1; }

#score {
  font-size: 44px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-shadow: 0 0 18px rgba(125, 245, 255, 0.55);
  font-variant-numeric: tabular-nums;
}
#score.pop { animation: score-pop 0.25s ease; }
@keyframes score-pop {
  40% { transform: scale(1.18); }
  100% { transform: scale(1); }
}

#combo {
  min-height: 24px;
  font-size: 20px;
  letter-spacing: 0.22em;
  color: var(--gold);
  text-shadow: 0 0 14px rgba(255, 209, 102, 0.6);
  opacity: 0;
  transition: opacity 0.3s ease;
}
#combo.on { opacity: 1; }

/* ---- lives (top right) ---- */
#lives {
  position: absolute;
  top: 34px;
  right: 40px;
  display: flex;
  gap: 12px;
  opacity: 0;
  transition: opacity 0.6s ease;
}
body.playing #lives { opacity: 1; }

#lives .life {
  width: 0;
  height: 0;
  border-left: 11px solid transparent;
  border-right: 11px solid transparent;
  border-bottom: 20px solid var(--cyan);
  filter: drop-shadow(0 0 8px rgba(125, 245, 255, 0.7));
  transition: opacity 0.3s ease, filter 0.3s ease;
}
#lives .life.lost {
  opacity: 0.18;
  filter: none;
}

/* ---- game over ---- */
#gameover {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
  background: radial-gradient(ellipse at center, rgba(4, 8, 20, 0.55), rgba(0, 0, 0, 0.15));
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.6s ease, visibility 0.6s;
}
#gameover.on { opacity: 1; visibility: visible; }

#gameover h1 {
  font-size: 64px;
  font-weight: 700;
  letter-spacing: 0.32em;
  text-indent: 0.32em;
  text-shadow: 0 0 30px rgba(125, 245, 255, 0.6);
}
#final-score { font-size: 30px; letter-spacing: 0.2em; }
#best-score { font-size: 18px; letter-spacing: 0.2em; color: var(--gold); }
#gameover .restart-hint {
  margin-top: 26px;
  font-size: 15px;
  letter-spacing: 0.3em;
  color: var(--dim);
  animation: hint-pulse 2.4s ease-in-out infinite;
}

/* ---- idle hint / watermark ---- */
#hint {
  position: absolute;
  bottom: 8vh;
  width: 100%;
  text-align: center;
  font-size: 16px;
  letter-spacing: 0.3em;
  color: var(--dim);
  opacity: 0;
  transition: opacity 1.2s ease;
}
#hint.on { opacity: 1; animation: hint-pulse 3s ease-in-out infinite; }
#hint .gold { color: var(--gold); }
#hint .gray { color: #aab; }
@keyframes hint-pulse {
  50% { opacity: 0.45; }
}

#watermark {
  position: absolute;
  bottom: 26px;
  right: 36px;
  font-size: 13px;
  letter-spacing: 0.5em;
  color: rgba(125, 245, 255, 0.28);
  transition: opacity 0.6s ease;
}
body.playing #watermark { opacity: 0; }

/* ---- pause menu ---- */
#menu {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(2, 5, 14, 0.55);
  backdrop-filter: blur(3px);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s;
}
body.paused #menu {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}
body.paused { cursor: default !important; }

#menu-panel {
  min-width: 320px;
  padding: 38px 46px;
  border: 1px solid rgba(125, 245, 255, 0.35);
  border-radius: 14px;
  background: rgba(6, 12, 28, 0.82);
  box-shadow: 0 0 60px rgba(20, 120, 160, 0.25), inset 0 0 40px rgba(20, 80, 120, 0.12);
  text-align: center;
}
#menu-panel h1 {
  font-size: 34px;
  font-weight: 700;
  letter-spacing: 0.34em;
  text-indent: 0.34em;
  margin-bottom: 26px;
  text-shadow: 0 0 22px rgba(125, 245, 255, 0.55);
}
#menu-panel h2 {
  font-size: 14px;
  letter-spacing: 0.3em;
  color: var(--dim);
  margin: 26px 0 12px;
}
.menu-buttons {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.menu-buttons button {
  font-family: var(--hud-font);
  font-size: 17px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  padding: 11px 18px;
  color: var(--cyan);
  background: rgba(20, 50, 80, 0.25);
  border: 1px solid rgba(125, 245, 255, 0.3);
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.15s ease, box-shadow 0.15s ease, border-color 0.15s ease;
}
.menu-buttons button:hover {
  background: rgba(125, 245, 255, 0.16);
  border-color: rgba(125, 245, 255, 0.7);
  box-shadow: 0 0 18px rgba(125, 245, 255, 0.25);
}
.menu-buttons button.active {
  border-color: var(--gold);
  color: var(--gold);
}
.menu-hint {
  margin-top: 24px;
  font-size: 12px;
  letter-spacing: 0.26em;
  color: var(--dim);
}

#debug {
  position: absolute;
  top: 8px;
  left: 8px;
  font: 12px monospace;
  text-transform: none;
  color: #6f6;
  display: none;
}

/* ---- fullscreen button ---- */
#fs-btn {
  position: fixed;
  bottom: 22px;
  left: 26px;
  width: 42px;
  height: 42px;
  border: 1px solid rgba(125, 245, 255, 0.35);
  border-radius: 8px;
  background: rgba(6, 12, 26, 0.5);
  color: var(--cyan);
  font-size: 20px;
  cursor: pointer;
  opacity: 0;
  transition: opacity 0.4s ease, background 0.2s ease;
}
body:not(.idle) #fs-btn { opacity: 0.65; }
#fs-btn:hover { background: rgba(125, 245, 255, 0.15); opacity: 1; }