* { box-sizing: border-box; }
html, body {
  margin: 0; padding: 0; height: 100%;
  background: #1b6ea8;
  color: #fff;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  overflow: hidden;
  touch-action: none;
  user-select: none;
  -webkit-user-select: none;
}
.screen { position: fixed; inset: 0; display: flex; flex-direction: column; align-items: center; justify-content: center; }
.hidden { display: none !important; }

#menu {
  gap: 14px; padding: 24px;
  text-align: center;
  /* Allow scrolling when content (logo + sets + audio + credits) overflows. */
  justify-content: flex-start;
  overflow-y: auto;
}
#menu h1 { font-size: clamp(32px, 6vw, 64px); margin: 0 0 8px; text-shadow: 2px 2px 0 #0a3a5c; }
#logo {
  width: min(560px, 90vw);
  max-height: 40vh;
  object-fit: contain;
  margin: 0 0 4px;
  filter: drop-shadow(0 6px 14px rgba(0, 0, 0, 0.5));
  /* Keep pixel art crisp if the source is small; harmless on full-res. */
  image-rendering: -webkit-optimize-contrast;
  pointer-events: none;
  user-select: none;
  flex: 0 0 auto;
}
.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0);
  white-space: nowrap; border: 0;
}
.set-list { display: grid; gap: 10px; width: min(520px, 100%); max-height: 36vh; overflow: auto; padding: 4px; flex: 0 0 auto; }
.set-list label {
  display: flex; align-items: center; gap: 12px;
  padding: 10px 14px; background: #14598a; border: 2px solid #0a3a5c; border-radius: 10px;
  cursor: pointer;
}
.set-list label:hover { background: #1873b0; }
.set-list input { transform: scale(1.4); }
.set-list .items { color: #cfe7ff; font-size: 14px; }
.big-btn {
  font-size: 22px; padding: 14px 32px; border-radius: 12px; border: 3px solid #0a3a5c;
  background: #ffcc33; color: #2a1a00; font-weight: 800; cursor: pointer;
}
.big-btn:disabled { opacity: 0.5; cursor: not-allowed; }
.hint { color: #cfe7ff; font-size: 14px; }

.audio-settings {
  display: flex; gap: 24px; justify-content: center;
  margin: 16px 0 4px;
  flex-wrap: wrap;
}
.audio-settings label {
  display: inline-flex; align-items: center; gap: 8px;
  color: #cfe7ff; font-size: 14px;
  background: rgba(0,0,0,0.35); padding: 6px 12px; border-radius: 10px;
}
.audio-settings input[type="range"] {
  width: 120px;
  accent-color: #ffd76a;
}
.credits {
  margin-top: 18px; padding-top: 14px; border-top: 1px solid rgba(255,255,255,0.15);
  color: #cfe7ff; font-size: 13px; line-height: 1.5; max-width: 720px;
  text-align: left;
  flex: 0 0 auto;
}
.credits h3 { margin: 0 0 8px; font-size: 15px; color: #fff; letter-spacing: 1px; text-transform: uppercase; }
.credits p { margin: 0 0 10px; }
.credits dl { margin: 0; display: grid; grid-template-columns: 180px 1fr; gap: 6px 16px; }
.credits dt { color: #9fb6cc; font-weight: 700; }
.credits dd { margin: 0; }
.credits .muted { color: #9fb6cc; font-size: 12px; }
.credits a { color: #ffcc33; text-decoration: none; }
.credits a:hover { text-decoration: underline; }
@media (max-width: 600px) {
  .credits dl { grid-template-columns: 1fr; gap: 2px 0; }
  .credits dt { margin-top: 8px; }
}

#game { background: #000; }

/* Loading overlay */
#loading-overlay {
  position: absolute; inset: 0; z-index: 90;
  display: flex; align-items: center; justify-content: center;
  background: rgba(0,0,0,0.85);
}
.loading-card {
  text-align: center; color: #fff;
  font: bold 18px system-ui, sans-serif;
}
.loading-track {
  width: 320px; height: 18px; border-radius: 10px;
  background: #333; margin: 14px auto 8px; overflow: hidden;
}
#loading-fill {
  height: 100%; width: 0%; border-radius: 10px;
  background: linear-gradient(90deg, #4caf50, #8bc34a);
  transition: width 120ms ease;
}
.loading-detail {
  font-size: 13px; color: #aaa; margin-top: 4px;
}
.loading-menu-btn {
  margin-top: 18px; padding: 10px 22px;
  font: bold 15px system-ui, sans-serif; color: #fff;
  background: #444; border: 2px solid #888; border-radius: 10px;
  cursor: pointer;
}
.loading-menu-btn:hover, .loading-menu-btn:focus {
  background: #555; border-color: #aaa;
}
.loading-play-btn {
  display: block; margin: 22px auto 0; padding: 16px 42px;
  font: 900 22px system-ui, sans-serif; color: #fff;
  background: linear-gradient(180deg, #4caf50, #2e7d32);
  border: 2px solid #8bc34a; border-radius: 14px;
  cursor: pointer; min-width: 220px;
}
.loading-play-btn:hover, .loading-play-btn:focus {
  background: linear-gradient(180deg, #66bb6a, #388e3c);
}
.loading-play-btn.hidden { display: none; }
.loading-card.failed #loading-fill {
  background: linear-gradient(90deg, #c84040, #e07070);
}

.difficulty-options {
  display: flex; flex-direction: column; gap: 6px;
  margin: 8px 0 4px;
  font: 14px system-ui, sans-serif;
}
.difficulty-options label {
  display: flex; align-items: center; gap: 8px;
  cursor: pointer;
}
.difficulty-options input[type=checkbox] {
  width: 18px; height: 18px; cursor: pointer;
}
#canvas {
  display: block; width: 100vw; height: 100vh; object-fit: contain;
  image-rendering: pixelated; image-rendering: crisp-edges;
  background: #6cbff0;
}
#hud {
  position: fixed; top: 10px; left: 10px; right: 10px;
  display: flex; align-items: center; gap: 10px; pointer-events: none;
}
#hud > * { pointer-events: auto; }
#target {
  font-size: clamp(28px, 5vw, 48px); font-weight: 900;
  background: rgba(0,0,0,0.55); padding: 6px 18px; border-radius: 12px;
  letter-spacing: 2px;
  text-transform: uppercase;
  /* Hidden by default so the kid plays by ear; press space / tap canvas to
     reveal briefly. The element still occupies its layout slot. */
  opacity: 0;
  transition: opacity 220ms ease-in-out;
}
#target.revealed { opacity: 1; }
#score {
  margin-left: auto;
  font-size: clamp(20px, 3.5vw, 32px); font-weight: 800;
  background: rgba(0,0,0,0.55); padding: 6px 14px; border-radius: 12px;
  min-width: 60px; text-align: center;
}
#power-rings {
  margin-left: auto;
  display: flex; gap: 6px; align-items: center;
}
#power-rings + #score { margin-left: 0; }
.power-ring {
  width: 44px; height: 44px;
  filter: drop-shadow(0 0 4px rgba(0,0,0,0.5));
}
.power-ring.off { display: none; }
.power-ring .track {
  fill: rgba(0,0,0,0.55);
  stroke: rgba(0,0,0,0.4);
  stroke-width: 4;
}
.power-ring .fill {
  fill: none;
  stroke: var(--ring-color, #9cff9c);
  stroke-width: 4;
  stroke-linecap: round;
  transform: rotate(-90deg);
  transform-origin: 24px 24px;
  stroke-dasharray: var(--ring-dash, "0 113");
  transition: stroke-dasharray 120ms linear;
}
.power-ring.blink { animation: ring-blink 0.45s steps(2) infinite; }
@keyframes ring-blink { 50% { opacity: 0.35; } }
#timer {
  font-size: clamp(18px, 3vw, 26px); font-weight: 700;
  background: rgba(0,0,0,0.55); padding: 6px 12px; border-radius: 12px;
  font-variant-numeric: tabular-nums;
  letter-spacing: 1px;
}
#combo {
  font-size: clamp(18px, 3vw, 26px); font-weight: 800;
  padding: 6px 10px; border-radius: 12px;
  background: rgba(0,0,0,0.55); color: #ffd76a;
  letter-spacing: 1px;
  min-width: 60px; text-align: center;
  opacity: 0;
  transition: opacity 200ms ease, transform 200ms ease;
}
#combo.active {
  opacity: 1;
  transform: scale(1.05);
  background: rgba(255, 140, 0, 0.7);
  color: #fff;
  box-shadow: 0 0 12px rgba(255, 180, 60, 0.6);
}
#progress-bar {
  position: fixed; left: 12px; right: 12px; bottom: 12px;
  height: 10px;
  background: rgba(0,0,0,0.55);
  border-radius: 6px;
  overflow: hidden;
  pointer-events: none;
  z-index: 9;
}
#progress-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, #9cff9c, #ffd76a);
  border-radius: 6px;
  transition: width 240ms ease-out;
}
#mute-btn, #back-btn {
  font-size: 22px; padding: 6px 12px; border-radius: 10px;
  background: rgba(0,0,0,0.55); color: #fff; border: 2px solid rgba(255,255,255,0.3);
  cursor: pointer;
}

#dpad {
  position: fixed; left: 14px; bottom: 14px;
  display: grid;
  grid-template-columns: 60px 60px 60px;
  grid-template-rows: 60px 60px 60px;
  gap: 6px;
  z-index: 10;
}
#dpad button {
  font-size: 26px; border-radius: 12px;
  background: rgba(0,0,0,0.45); color: #fff; border: 2px solid rgba(255,255,255,0.35);
  touch-action: none;
}
#dpad button:active { background: rgba(255,255,255,0.35); }
#dpad [data-dir="up"]    { grid-column: 2; grid-row: 1; }
#dpad [data-dir="left"]  { grid-column: 1; grid-row: 2; }
#dpad [data-dir="right"] { grid-column: 3; grid-row: 2; }
#dpad [data-dir="down"]  { grid-column: 2; grid-row: 3; }

/* Win overlay shown when score reaches 100. */
#win-screen {
  position: fixed; inset: 0; z-index: 50;
  display: flex; align-items: center; justify-content: center;
  background: radial-gradient(circle at center, rgba(255, 220, 90, 0.4), rgba(0, 0, 0, 0.75));
  animation: winFadeIn 0.4s ease-out both;
}
.win-card {
  background: linear-gradient(180deg, #fff7d6, #ffd84d);
  color: #2a1a00;
  padding: 32px 40px;
  border-radius: 24px;
  border: 6px solid #b58400;
  text-align: center;
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.5);
  max-width: min(520px, 90vw);
  animation: winPop 0.5s cubic-bezier(.2,1.4,.4,1) both;
}
.win-emoji { font-size: clamp(42px, 8vw, 72px); line-height: 1; }
.win-card h2 { margin: 8px 0 4px; font-size: clamp(36px, 6vw, 56px); }
.win-card p  { margin: 0 0 12px; font-size: clamp(18px, 3vw, 24px); font-weight: 600; }
.win-stats {
  list-style: none; padding: 0; margin: 8px 0 18px;
  display: grid; grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 4px 16px;
  font-size: clamp(14px, 2.4vw, 18px);
  text-align: left;
  color: #4a3500;
}
.win-stats li { background: rgba(255, 255, 255, 0.45); padding: 4px 10px; border-radius: 6px; }
.win-stats b { color: #1a1a1a; }
@media (max-width: 480px) {
  .win-stats { grid-template-columns: 1fr; }
}
.audio-settings #fullscreen-btn {
  font-size: 14px; padding: 6px 14px; border-radius: 10px;
  background: rgba(0,0,0,0.45); color: #fff;
  border: 2px solid rgba(255,255,255,0.35);
  cursor: pointer;
}
.audio-settings #fullscreen-btn:hover { background: rgba(0,0,0,0.65); }
@keyframes winFadeIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes winPop {
  0%   { transform: scale(0.6) rotate(-4deg); opacity: 0; }
  60%  { transform: scale(1.05) rotate(2deg); opacity: 1; }
  100% { transform: scale(1) rotate(0); opacity: 1; }
}