:root {
  --sky: #4fc3f7;
  --sun: #ffd54f;
  --grass: #7cb342;
  --accent: #ff7043;
  --accent-dark: #e64a19;
  --panel: rgba(255,255,255,0.92);
  --text-dark: #2d3436;
  color-scheme: light;
}

* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }

html, body {
  margin: 0;
  padding: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  font-family: "Hiragino Maru Gothic ProN", "Yu Gothic", "Rounded Mplus 1c", "Helvetica Neue", Arial, sans-serif;
  background: var(--sky);
  touch-action: none;
  user-select: none;
  -webkit-user-select: none;
}

.screen {
  position: fixed;
  inset: 0;
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}
.screen.active { display: flex; }

/* ---------- Loading ---------- */
#loading-screen {
  background: linear-gradient(180deg, var(--sky) 0%, #81d4fa 60%, var(--grass) 100%);
}
.loading-car {
  font-size: 72px;
  animation: bounce 1s infinite ease-in-out;
}
@keyframes bounce {
  0%, 100% { transform: translateY(0) scaleX(1); }
  50% { transform: translateY(-18px) scaleX(1); }
}
.loading-text {
  margin-top: 8px;
  font-size: 22px;
  font-weight: 700;
  color: #fff;
  text-shadow: 0 2px 4px rgba(0,0,0,0.25);
}
.loading-bar-outer {
  margin-top: 20px;
  width: min(70vw, 320px);
  height: 18px;
  background: rgba(255,255,255,0.5);
  border-radius: 12px;
  overflow: hidden;
  border: 3px solid #fff;
}
.loading-bar-inner {
  height: 100%;
  width: 0%;
  background: var(--accent);
  transition: width 0.2s ease;
}

/* ---------- Stage screen ---------- */
#stage-screen {
  background: linear-gradient(180deg, #4fc3f7 0%, #7e57c2 100%);
  padding: env(safe-area-inset-top, 16px) 16px calc(env(safe-area-inset-bottom, 16px) + 8px) 16px;
  justify-content: flex-start;
}
.stage-grid {
  flex: 1;
  width: 100%;
  max-width: 900px;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  touch-action: pan-y;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
  padding: 10px 6px 20px 6px;
  align-content: start;
}
.stage-card {
  background: var(--panel);
  border-radius: 22px;
  padding: 18px 14px;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  cursor: pointer;
  border: none;
  box-shadow: 0 6px 0 rgba(0,0,0,0.18);
  transition: transform 0.1s ease;
}
.stage-card:active { transform: scale(0.96) translateY(3px); box-shadow: 0 3px 0 rgba(0,0,0,0.18); }
.stage-card .stage-emoji { font-size: 56px; line-height: 1; margin-bottom: 8px; }
.stage-card .stage-name { font-size: 18px; font-weight: 800; color: var(--text-dark); margin-bottom: 6px; }
.stage-card .stage-desc { font-size: 12.5px; color: #55606b; line-height: 1.4; }

.stage-back-btn {
  align-self: flex-start;
  margin-top: 4px;
  padding: 8px 14px;
  border: none;
  border-radius: 16px;
  background: var(--panel);
  color: var(--text-dark);
  font-weight: 700;
  font-size: 13px;
  box-shadow: 0 3px 0 rgba(0,0,0,0.15);
}
.stage-back-btn:active { transform: translateY(2px); box-shadow: none; }

/* ---------- Select screen ---------- */
#select-screen {
  background: linear-gradient(180deg, var(--sky) 0%, #b3e5fc 100%);
  padding: env(safe-area-inset-top, 16px) 16px calc(env(safe-area-inset-bottom, 16px) + 8px) 16px;
  justify-content: flex-start;
}
.app-version {
  position: absolute;
  top: calc(env(safe-area-inset-top, 0px) + 8px);
  right: 12px;
  font-size: 12px;
  font-weight: 700;
  color: rgba(255,255,255,0.85);
  text-shadow: 0 1px 2px rgba(0,0,0,0.2);
  z-index: 5;
}

.title {
  font-size: clamp(20px, 4.5vw, 32px);
  color: #fff;
  text-shadow: 0 3px 0 rgba(0,0,0,0.15);
  margin: 14px 0 10px 0;
  text-align: center;
}
.car-grid {
  flex: 1;
  width: 100%;
  max-width: 1100px;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  touch-action: pan-y;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
  gap: 12px;
  padding: 6px 6px 16px 6px;
}
.car-card {
  background: var(--panel);
  border-radius: 18px;
  padding: 10px 8px 8px 8px;
  display: flex;
  flex-direction: column;
  align-items: center;
  border: 4px solid transparent;
  cursor: pointer;
  transition: transform 0.12s ease, border-color 0.12s ease;
  box-shadow: 0 4px 0 rgba(0,0,0,0.12);
}
.car-card:active { transform: scale(0.95); }
.car-card.selected {
  border-color: var(--accent);
  transform: translateY(-4px);
  box-shadow: 0 8px 0 var(--accent-dark);
}
.car-card img {
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: contain;
  pointer-events: none;
}
.car-card .car-label {
  margin-top: 4px;
  font-size: 13px;
  font-weight: 700;
  color: var(--text-dark);
  text-align: center;
}

.big-button {
  margin: 10px 0 4px 0;
  padding: 16px 48px;
  font-size: 24px;
  font-weight: 800;
  color: #fff;
  background: linear-gradient(180deg, #ff8a65, var(--accent-dark));
  border: none;
  border-radius: 40px;
  box-shadow: 0 6px 0 #bf360c;
  cursor: pointer;
  transition: transform 0.08s ease, box-shadow 0.08s ease;
}
.big-button:active:not(:disabled) {
  transform: translateY(4px);
  box-shadow: 0 2px 0 #bf360c;
}
.big-button:disabled {
  background: #b0bec5;
  box-shadow: 0 6px 0 #78909c;
  cursor: not-allowed;
  opacity: 0.8;
}

/* ---------- Game screen ---------- */
#game-screen { background: #000; }
#game-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
  touch-action: none;
}

.hud-top {
  position: absolute;
  top: calc(env(safe-area-inset-top, 0px) + 10px);
  left: 10px;
  right: 10px;
  display: flex;
  align-items: center;
  gap: 10px;
  z-index: 10;
  pointer-events: none;
}
.hud-top > * { pointer-events: auto; }

.hud-button {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  border: none;
  background: var(--panel);
  font-size: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 3px 0 rgba(0,0,0,0.2);
}
.hud-button:active { transform: translateY(2px); box-shadow: none; }
.mode-manual { background: #fff59d; }
.mode-auto { background: #a5d6a7; }

.car-name-badge {
  flex: 1;
  text-align: center;
  background: var(--panel);
  border-radius: 20px;
  padding: 10px 14px;
  font-weight: 800;
  color: var(--text-dark);
  font-size: 15px;
  box-shadow: 0 3px 0 rgba(0,0,0,0.2);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.mode-banner {
  position: absolute;
  top: 76px;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(255,255,255,0.95);
  padding: 8px 20px;
  border-radius: 20px;
  font-weight: 800;
  color: var(--accent-dark);
  font-size: 15px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease, transform 0.3s ease;
  z-index: 10;
}
.mode-banner.show {
  opacity: 1;
  transform: translateX(-50%) translateY(6px);
}

/* ---------- Touch controls ---------- */
.touch-controls {
  position: absolute;
  left: 0; right: 0; bottom: 0;
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  padding: 0 16px calc(env(safe-area-inset-bottom, 0px) + 18px) 16px;
  z-index: 10;
  pointer-events: none;
}
.touch-controls.hidden-controls { display: none; }
.touch-left, .touch-right {
  display: flex;
  gap: 14px;
  pointer-events: auto;
}
.touch-btn {
  width: 66px;
  height: 66px;
  border-radius: 50%;
  border: none;
  font-size: 26px;
  background: rgba(255,255,255,0.85);
  box-shadow: 0 4px 0 rgba(0,0,0,0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-dark);
}
.touch-btn:active { transform: translateY(3px); box-shadow: none; background: rgba(255,255,255,1); }
.accel-btn { width: 84px; height: 84px; font-size: 32px; background: rgba(124,179,66,0.9); color: #fff; }
.brake-btn { background: rgba(239,83,80,0.9); color: #fff; }

/* ---------- Install toast ---------- */
.install-toast {
  position: fixed;
  left: 50%;
  bottom: calc(env(safe-area-inset-bottom, 0px) + 16px);
  transform: translateX(-50%);
  background: var(--text-dark);
  color: #fff;
  padding: 10px 10px 10px 16px;
  border-radius: 30px;
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  z-index: 50;
  box-shadow: 0 4px 14px rgba(0,0,0,0.3);
}
.install-toast.hidden { display: none; }
.install-toast button {
  border: none;
  border-radius: 20px;
  padding: 8px 14px;
  font-weight: 700;
  cursor: pointer;
}
#install-btn { background: var(--accent); color: #fff; }
#install-dismiss { background: transparent; color: #fff; font-size: 18px; padding: 4px 8px; }

@media (min-width: 900px) {
  .car-grid { grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); }
}