:root {
  --bg-deep: #060a0f;
  --bg-mid: #0a1628;
  --accent-fire: #ff6830;
  --accent-water: #30a8ff;
  --accent-lava: #ff3040;
  --accent-ice: #80d8ff;
  --accent-snow: #ffe8d0;
  --accent-sea: #20c8a0;
  --glow: rgba(96, 180, 255, 0.35);
  --text: #e8f0f5;
  --muted: rgba(200, 220, 235, 0.55);
  --ring-border: rgba(140, 200, 255, 0.25);
}

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

html, body {
  width: 100%; height: 100%;
  overflow: hidden;
  background: var(--bg-deep);
  font-family: "Avenir Next", "Segoe UI", -apple-system, sans-serif;
  color: var(--text);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

/* ===== START OVERLAY ===== */
#start-overlay {
  position: fixed;
  inset: 0;
  z-index: 100;
  background: radial-gradient(ellipse at center, rgba(10,22,40,0.88) 0%, rgba(6,10,15,0.97) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background 1.5s ease;
}

#start-overlay.hidden {
  background: rgba(6, 10, 15, 0);
  pointer-events: none;
}

.overlay-inner {
  text-align: center;
}

.overlay-inner h1 {
  font-size: clamp(2.2rem, 6vw, 5rem);
  font-weight: 700;
  letter-spacing: 0.04em;
  background: linear-gradient(135deg, var(--accent-water), var(--accent-snow));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 0.3em;
  animation: title-pulse 4s ease-in-out infinite;
}

.overlay-inner .sub {
  font-size: clamp(0.8rem, 2vw, 1.1rem);
  color: var(--muted);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  margin-bottom: 2.5em;
}

.overlay-inner .cta {
  font-size: 0.95rem;
  color: var(--accent-water);
  letter-spacing: 0.1em;
  animation: cta-breathe 2.5s ease-in-out infinite;
}

@keyframes title-pulse {
  0%, 100% { filter: brightness(1); }
  50% { filter: brightness(1.25); }
}

@keyframes cta-breathe {
  0%, 100% { opacity: 0.4; }
  50% { opacity: 1; }
}

/* ===== HUD ===== */
#hud {
  position: fixed;
  top: 12px;
  left: 0; right: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 0 16px;
  pointer-events: none;
}

#score-ring {
  position: relative;
  width: 56px; height: 56px;
  border-radius: 50%;
  border: 2px solid var(--ring-border);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: border-color 0.6s ease, box-shadow 0.6s ease;
}

#score-ring.energized {
  border-color: var(--accent-snow);
  box-shadow: 0 0 20px rgba(255, 232, 208, 0.3);
}

#score-text {
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.04em;
}

#charge-bar {
  width: min(220px, 40vw);
  height: 6px;
  background: rgba(255,255,255,0.08);
  border-radius: 99px;
  overflow: hidden;
}

#charge-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--accent-water), var(--accent-fire));
  border-radius: 99px;
  transition: width 0.12s ease-out;
}

#charge-fill.maxed {
  background: linear-gradient(90deg, var(--accent-snow), var(--accent-fire));
  box-shadow: 0 0 10px rgba(255,232,208,0.5);
}

.hud-btn {
  pointer-events: auto;
  background: none;
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: 50%;
  width: 36px; height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--muted);
  cursor: pointer;
  transition: color 0.25s, border-color 0.25s;
}

.hud-btn:hover {
  color: var(--text);
  border-color: var(--ring-border);
}

/* ===== MESSAGE POPUP ===== */
#msg {
  position: fixed;
  inset: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: center;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.6s ease;
}

#msg.visible { opacity: 1; }

#msg span {
  font-size: clamp(1.8rem, 5vw, 3.2rem);
  font-weight: 700;
  text-align: center;
  background: linear-gradient(135deg, var(--accent-snow), var(--accent-fire));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-shadow: none;
  animation: msg-float 2.5s ease-in-out infinite;
}

@keyframes msg-float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-6px); }
}

/* ===== INSTRUCTIONS ===== */
#instructions {
  position: fixed;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 8;
  padding: 8px 18px;
  font-size: 0.72rem;
  color: var(--muted);
  background: rgba(0,0,0,0.35);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 99px;
  text-align: center;
  pointer-events: none;
  transition: opacity 1.5s ease;
  white-space: nowrap;
}

#instructions.hidden { opacity: 0; }

/* ===== RESET BUTTON ===== */
#reset-btn {
  position: fixed;
  bottom: 16px;
  right: 16px;
  z-index: 10;
  padding: 7px 16px;
  font-size: 0.75rem;
  font-family: inherit;
  color: var(--muted);
  background: rgba(0,0,0,0.4);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 6px;
  cursor: pointer;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.6s, color 0.2s, border-color 0.2s;
}

#reset-btn.visible { opacity: 1; pointer-events: auto; }
#reset-btn:hover { color: var(--text); border-color: var(--ring-border); }

/* ===== VICTORY RING PULSE ===== */
#score-ring.complete {
  animation: ring-complete 1.5s ease-in-out infinite;
  border-color: var(--accent-snow);
}

@keyframes ring-complete {
   0%, 100% { box-shadow: 0 0 20px rgba(255, 232, 208, 0.3); }
   50% { box-shadow: 0 0 35px rgba(255, 232, 208, 0.6); }
}

/* ===== VICTORY RING PULSE ===== */
#score-ring.complete {
  animation: ring-complete 1.5s ease-in-out infinite;
  border-color: var(--accent-snow);
}

@keyframes ring-complete {
  0%, 100% { box-shadow: 0 0 20px rgba(255, 232, 208, 0.3); }
  50% { box-shadow: 0 0 35px rgba(255, 232, 208, 0.6); }
}