/* ---- Home button (shown on subject pages) ---- */
#home-btn {
  position: fixed;
  top: 16px;
  left: 16px;
  z-index: 100;
  background: rgba(0,0,0,0.28);
  color: #fff;
  text-decoration: none;
  padding: 8px 16px;
  border-radius: 20px;
  font-size: 18px;
  font-weight: 900;
  letter-spacing: 1px;
  backdrop-filter: blur(4px);
  -webkit-tap-highlight-color: transparent;
}

/* ---- Reset ---- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html, body {
  width: 100%; height: 100%;
  overflow: hidden;
  font-family: 'Arial Rounded MT Bold', 'Nunito', Arial, sans-serif;
  touch-action: manipulation; /* removes 300ms tap delay */
  -webkit-tap-highlight-color: transparent;
  -webkit-touch-callout: none;
  user-select: none;
  -webkit-user-select: none;
}

/* ---- Scene ---- */
#scene {
  position: fixed; inset: 0; z-index: 0;
  display: flex; flex-direction: column;
}
#sky {
  flex: 1;
  background: linear-gradient(180deg, #87CEEB 0%, #B0E0FF 100%);
}
#ground {
  height: 120px;
  background: linear-gradient(180deg, #8B6914 0%, #6B4F10 100%);
}

/* ---- Word Track ---- */
#word-track {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  display: flex;
  align-items: center;
  gap: 24px;
  z-index: 10;
}

.letter-block {
  width: 100px;
  height: 100px;
  border-radius: 16px;
  background: #FFF9E6;
  border: 5px solid #E8C84A;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 52px;
  font-weight: 900;
  color: #333;
  box-shadow: 0 6px 0 #C8A830, 0 8px 20px rgba(0,0,0,0.2);
  position: relative;
  transition: transform 0.15s ease;
}

/* Active letter glows and pops bigger */
.letter-block.active {
  background: #FFF3B0;
  border-color: #F5A623;
  box-shadow: 0 6px 0 #C8831A, 0 0 30px rgba(245,166,35,0.6), 0 8px 20px rgba(0,0,0,0.2);
  transform: scale(1.35);
  z-index: 2;
  animation: pulse-block 1.2s ease-in-out infinite;
}

/* Completed letter */
.letter-block.done {
  background: #E8FFE8;
  border-color: #4CAF50;
  box-shadow: 0 6px 0 #388E3C, 0 8px 20px rgba(0,0,0,0.2);
}

@keyframes pulse-block {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.06); }
}

/* ---- Mud Pit ---- */
#mudpit {
  position: fixed;
  bottom: 80px;
  z-index: 9;
  /* positioned by JS to sit after the last letter block */
}
#mudpit-svg {
  width: 180px;
  height: 80px;
}

/* ---- Celebration illustration (big, above digger) ---- */
#celebration-emoji {
  width: 120px;
  height: 120px;
  margin-bottom: 12px;
  opacity: 0;
  transform: scale(0);
  filter: drop-shadow(0 6px 18px rgba(0,0,0,0.4));
}

/* ---- Digger ---- */
#digger-wrapper {
  position: fixed;
  z-index: 20;
  display: flex;
  flex-direction: column;
  align-items: center;
  cursor: pointer;
  /* JS sets left / bottom */
}

#digger {
  width: 120px;
  height: 80px;
  filter: drop-shadow(0 4px 8px rgba(0,0,0,0.3));
  transition: filter 0.1s;
}

#digger:active {
  filter: drop-shadow(0 2px 4px rgba(0,0,0,0.2));
}

/* Tap hint bubble */
#tap-hint {
  background: #FF6B35;
  color: white;
  border-radius: 20px;
  padding: 4px 14px;
  font-size: 14px;
  font-weight: 900;
  letter-spacing: 1px;
  margin-top: 4px;
  box-shadow: 0 3px 8px rgba(0,0,0,0.25);
  opacity: 0;
  transform: translateY(4px);
  transition: opacity 0.3s, transform 0.3s;
}

#tap-hint.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ---- Parent Confirm Button ---- */
#confirm-btn {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 30;
  width: 120px;
  height: 120px;
  border-radius: 50%;
  background: #4CAF50;
  color: white;
  font-size: 58px;
  font-weight: 900;
  border: 5px solid #388E3C;
  box-shadow: 0 8px 0 #2E7D32, 0 10px 28px rgba(0,0,0,0.35);
  cursor: pointer;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.1s, box-shadow 0.1s;
}

#confirm-btn:active {
  transform: translateY(3px);
  box-shadow: 0 3px 0 #2E7D32, 0 4px 10px rgba(0,0,0,0.2);
}

#confirm-btn.hidden {
  opacity: 0;
  pointer-events: none;
}

/* ---- Dirt Puffs ---- */
#dirt-puffs {
  position: fixed;
  inset: 0;
  z-index: 25;
  pointer-events: none;
}

.puff {
  position: absolute;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: #8B6914;
  opacity: 0;
}

/* ---- Celebration ---- */
#celebration {
  position: fixed;
  inset: 0;
  z-index: 50;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: rgba(0,0,0,0.55);
  opacity: 0;
  pointer-events: none;
}

#celebration.active {
  pointer-events: auto;
}

/* Surprise vehicle photo card (random reveal at celebration) */
#surprise-vehicle {
  width: min(340px, 82vw);
  height: min(240px, 58vw);
  background: #FFF9E6;
  border: 6px solid #FFFFFF;
  border-radius: 24px;
  overflow: hidden;
  box-shadow: 0 12px 34px rgba(0,0,0,0.55);
  transform: scale(0);
  display: flex;
  align-items: center;
  justify-content: center;
}

#surprise-vehicle img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

#celebration-text {
  font-size: 52px;
  font-weight: 900;
  color: #FFF;
  text-shadow: 0 4px 16px rgba(0,0,0,0.6), 0 0 30px #F5A623;
  margin-top: 24px;
  text-align: center;
  opacity: 0;
  letter-spacing: 2px;
}

/* ---- Word Banner ---- */
#word-banner {
  position: fixed;
  top: 24px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 60;
  font-size: 64px;
  font-weight: 900;
  color: #FFF;
  text-shadow: 0 4px 16px rgba(0,0,0,0.7);
  letter-spacing: 6px;
  opacity: 0;
  pointer-events: none;
}

/* ---- Confetti ---- */
#confetti-container, #stars-container {
  position: fixed;
  inset: 0;
  z-index: 55;
  pointer-events: none;
}

.confetti-piece {
  position: absolute;
  width: 14px;
  height: 14px;
  opacity: 0;
  border-radius: 2px;
}

.star {
  position: absolute;
  font-size: 28px;
  opacity: 0;
}

/* ---- Screen shake keyframe ---- */
@keyframes rumble {
  0%, 100% { transform: translate(0, 0); }
  20% { transform: translate(-6px, 3px); }
  40% { transform: translate(6px, -3px); }
  60% { transform: translate(-4px, 5px); }
  80% { transform: translate(4px, -5px); }
}

body.rumble {
  animation: rumble 0.4s ease-in-out;
}

/* ---- Responsive: lock to landscape feel on small screens ---- */
@media (max-height: 500px) {
  .letter-block { width: 72px; height: 72px; font-size: 36px; }
  #confirm-btn { width: 80px; height: 80px; font-size: 38px; bottom: 12px; right: 12px; }
}