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

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

#board {
  position: relative;
  width: 100vw;
  height: 100vh;
  overflow: hidden;
}

/* ── Task Banner ─────────────────────────────────────────────────────────── */
#task-banner {
  position: absolute;
  top: 0; left: 0; right: 0;
  z-index: 100;
  padding: 10px 56px 10px 16px;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  border-radius: 0 0 20px 20px;
  box-shadow: 0 4px 20px rgba(102,126,234,0.4);
  display: none;
  align-items: center;
  gap: 10px;
  overflow: hidden;
}

#task-text-inner {
  font-family: 'Nunito', sans-serif;
  font-weight: 900;
  color: #fff;
  white-space: nowrap;
  display: inline-block;
  text-align: center;
  flex: 1;
}

#task-text-inner.scrolling {
  animation: taskScroll linear infinite;
}

@keyframes taskScroll {
  0%   { transform: translateX(100%); }
  100% { transform: translateX(-100%); }
}

/* ── ISSUE #11: Hint Button ──────────────────────────────────────────────── */
#hint-btn {
  position: absolute;
  right: 10px;
  top: 50%;
  transform: translateY(-50%);
  background: rgba(255,255,255,0.25);
  border: 2px solid rgba(255,255,255,0.5);
  border-radius: 50%;
  width: 42px; height: 42px;
  font-size: 22px;
  display: none;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.2s;
  flex-shrink: 0;
  z-index: 110;
  touch-action: none;
}
#hint-btn:hover, #hint-btn:active {
  background: rgba(255,255,255,0.45);
  transform: translateY(-50%) scale(1.1);
}

/* ── ISSUE #11: Hint highlight animation ─────────────────────────────────── */
@keyframes hintPulse {
  0%   { filter: brightness(1) drop-shadow(0 0 0px rgba(255,220,0,0)); transform: var(--el-transform) scale(1); }
  25%  { filter: brightness(1.5) drop-shadow(0 0 18px rgba(255,220,0,0.9)); transform: var(--el-transform) scale(1.22); }
  55%  { filter: brightness(1.3) drop-shadow(0 0 12px rgba(255,200,0,0.7)); transform: var(--el-transform) scale(1.15); }
  80%  { filter: brightness(1.1) drop-shadow(0 0 6px rgba(255,180,0,0.4)); transform: var(--el-transform) scale(1.05); }
  100% { filter: brightness(1) drop-shadow(0 0 0px rgba(255,220,0,0)); transform: var(--el-transform) scale(1); }
}

.board-el.hint-highlight {
  animation: hintPulse 1.8s ease-out forwards !important;
  z-index: 999 !important;
}

/* ── Navigation Buttons ──────────────────────────────────────────────────── */
.nav-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  z-index: 200;
  background: rgba(0,0,0,0.12);
  color: rgba(0,0,0,0.4);
  font-size: 40px;
  width: 60px;
  height: 80px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s;
  user-select: none;
}
.nav-btn:hover { background: rgba(0,0,0,0.25); color: rgba(0,0,0,0.7); }
.nav-btn:active { transform: translateY(-50%) scale(0.93); }
#nav-prev { left: 8px; }
#nav-next { right: 8px; }

/* ── Elements Layer ──────────────────────────────────────────────────────── */
/* ISSUE #4: Elements layer position is controlled by JS (dynamically offset below banner) */
#elements-layer {
  position: absolute;
  left: 0; right: 0;
  top: 0;
  height: 100%;
}

/* ── Board Elements ──────────────────────────────────────────────────────── */
.board-el {
  position: absolute;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'Fredoka One', sans-serif;
  line-height: 1;
  transform-origin: center center;
  transition: transform 0.12s ease;
  /* ISSUE #5: allow text to overflow visible bounds */
  overflow: visible;
}

.board-el.clickable {
  cursor: pointer;
}
.board-el.clickable:active {
  filter: brightness(0.9);
}

.board-el.type-shape svg,
.board-el.type-image img {
  width: 100%; height: 100%; display: block;
}
.board-el.type-image img { object-fit: contain; }
.board-el.type-color {
  box-shadow: 0 4px 20px rgba(0,0,0,0.15);
}

/* ── Board Element Animations ────────────────────────────────────────────── */
.board-el.anim-bounce { animation: elBounce 1.2s ease-in-out infinite; }
.board-el.anim-pulse  { animation: elPulse 1.5s ease-in-out infinite; }
.board-el.anim-shake  { animation: elShake 0.8s ease-in-out infinite; }
.board-el.anim-spin   { animation: elSpin 3s linear infinite; }
.board-el.anim-wobble { animation: elWobble 2s ease-in-out infinite; }
.board-el.anim-swing  { animation: elSwing 2s ease-in-out infinite; }
.board-el.anim-float  { animation: elFloat 3s ease-in-out infinite; }

@keyframes elBounce {
  0%,100% { transform: var(--el-transform) translateY(0); }
  50%      { transform: var(--el-transform) translateY(-14px); }
}
@keyframes elPulse {
  0%,100% { transform: var(--el-transform) scale(1); }
  50%      { transform: var(--el-transform) scale(1.15); }
}
@keyframes elShake {
  0%,100% { transform: var(--el-transform) rotate(0deg); }
  25%      { transform: var(--el-transform) rotate(-8deg); }
  75%      { transform: var(--el-transform) rotate(8deg); }
}
@keyframes elSpin {
  from { transform: var(--el-transform) rotate(0deg); }
  to   { transform: var(--el-transform) rotate(360deg); }
}
@keyframes elWobble {
  0%,100% { transform: var(--el-transform) rotate(0) scale(1); }
  25%      { transform: var(--el-transform) rotate(-5deg) scale(1.05); }
  75%      { transform: var(--el-transform) rotate(5deg) scale(1.05); }
}
@keyframes elSwing {
  0%,100% { transform: var(--el-transform) rotate(0deg); }
  25%      { transform: var(--el-transform) rotate(15deg); }
  75%      { transform: var(--el-transform) rotate(-15deg); }
}
@keyframes elFloat {
  0%,100% { transform: var(--el-transform) translateY(0) scale(1); }
  50%      { transform: var(--el-transform) translateY(-8px) scale(1.03); }
}

/* ── Feedback Overlay ────────────────────────────────────────────────────── */
#feedback-overlay {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: clamp(80px, 20vw, 200px);
  pointer-events: none;
  z-index: 999;
  opacity: 0;
}

#feedback-overlay.fx-correct-checkmark { animation: fxCheckmark 1.4s ease forwards; }
@keyframes fxCheckmark {
  0%   { opacity:0; transform:scale(0.3); }
  15%  { opacity:1; transform:scale(1.2); }
  40%  { transform:scale(1); }
  80%  { opacity:1; }
  100% { opacity:0; transform:scale(1.1); }
}

#feedback-overlay.fx-correct-stars { animation: fxStars 1.2s ease forwards; }
@keyframes fxStars {
  0%   { opacity:0; transform:scale(0.5) rotate(-30deg); }
  20%  { opacity:1; transform:scale(1.3) rotate(10deg); }
  60%  { opacity:1; transform:scale(1) rotate(0deg); }
  100% { opacity:0; transform:scale(1.2) translateY(-20px); }
}

#feedback-overlay.fx-correct-bounce { animation: fxBounce 1.2s ease forwards; }
@keyframes fxBounce {
  0%   { opacity:0; transform:translateY(-60px) scale(0.5); }
  30%  { opacity:1; transform:translateY(10px) scale(1.1); }
  50%  { transform:translateY(-15px) scale(0.95); }
  70%  { transform:translateY(5px) scale(1); }
  100% { opacity:0; transform:translateY(0) scale(1); }
}

#feedback-overlay.fx-correct-rainbow { animation: fxRainbow 1.5s ease forwards; }
@keyframes fxRainbow {
  0%   { opacity:0; transform:scale(0.5); filter:hue-rotate(0deg); }
  20%  { opacity:1; transform:scale(1.2); }
  50%  { filter:hue-rotate(180deg); }
  80%  { opacity:1; filter:hue-rotate(360deg); }
  100% { opacity:0; transform:scale(1.3); }
}

#feedback-overlay.fx-wrong-shake { animation: fxWrongShake 0.7s ease forwards; }
@keyframes fxWrongShake {
  0%   { opacity:0; }
  10%  { opacity:1; transform:translateX(-30px); }
  30%  { transform:translateX(30px); }
  50%  { transform:translateX(-20px); }
  70%  { transform:translateX(20px); }
  90%  { transform:translateX(0); opacity:1; }
  100% { opacity:0; }
}

#feedback-overlay.fx-wrong-wobble { animation: fxWrongWobble 0.9s ease forwards; }
@keyframes fxWrongWobble {
  0%   { opacity:0; transform:scale(1) rotate(0deg); }
  15%  { opacity:1; transform:scale(1.2) rotate(-15deg); }
  35%  { transform:scale(0.9) rotate(15deg); }
  55%  { transform:scale(1.1) rotate(-10deg); }
  75%  { transform:scale(1) rotate(5deg); opacity:1; }
  100% { opacity:0; transform:rotate(0deg); }
}

#feedback-overlay.fx-wrong-drop { animation: fxWrongDrop 0.8s ease forwards; }
@keyframes fxWrongDrop {
  0%   { opacity:0; transform:translateY(-30px); }
  20%  { opacity:1; transform:translateY(10px); }
  50%  { transform:translateY(-8px); }
  80%  { opacity:1; transform:translateY(4px); }
  100% { opacity:0; }
}

/* ── Effect Overlay ─────────────────────────────────────────────────────── */
#effect-overlay {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 990;
  opacity: 0;
}
#effect-overlay.fx-flash-green {
  background: radial-gradient(circle, rgba(34,197,94,0.5) 0%, transparent 70%);
  animation: flashOverlay 0.6s ease forwards;
}
#effect-overlay.fx-flash-red {
  background: radial-gradient(circle, rgba(239,68,68,0.5) 0%, transparent 70%);
  animation: flashOverlay 0.6s ease forwards;
}
@keyframes flashOverlay {
  0%   { opacity:0; }
  20%  { opacity:1; }
  100% { opacity:0; }
}

/* ── Confetti Canvas ─────────────────────────────────────────────────────── */
#confetti-canvas {
  position: fixed;
  inset: 0;
  width: 100%; height: 100%;
  pointer-events: none;
  z-index: 998;
}

/* ── Click Ripple ────────────────────────────────────────────────────────── */
.ripple {
  position: absolute;
  border-radius: 50%;
  background: rgba(255,255,255,0.55);
  transform: scale(0);
  animation: rippleAnim 0.5s linear;
  pointer-events: none;
  z-index: 10;
}
@keyframes rippleAnim { to { transform: scale(3); opacity: 0; } }

/* ── Connection dot ─────────────────────────────────────────────────────── */
#conn-dot {
  position: fixed;
  bottom: 8px; right: 8px;
  width: 10px; height: 10px;
  border-radius: 50%;
  background: #4caf50;
  z-index: 1000;
}
#conn-dot.off { background: #f44336; animation: blink 1s infinite; }
@keyframes blink { 50% { opacity: 0; } }