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

html, body {
  margin: 0;
  height: 100%;
  overflow: hidden;
  background: #8fc8f0;
  font-family: system-ui, -apple-system, "PingFang SC", "Noto Sans CJK SC", "Microsoft YaHei", sans-serif;
  color: #fff;
  user-select: none;
  -webkit-user-select: none;
  overscroll-behavior: none;
}

#scene {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
  touch-action: none;
  outline: none;
}

#hud {
  position: fixed;
  left: calc(12px + env(safe-area-inset-left));
  top: calc(12px + env(safe-area-inset-top));
  padding: 8px 14px;
  border-radius: 14px;
  background: rgba(10, 30, 60, .38);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  pointer-events: none;
}
#hud .title { font-size: 17px; font-weight: 700; letter-spacing: .06em; }
#hud .stats { font-size: 12.5px; opacity: .92; margin-top: 2px; font-variant-numeric: tabular-nums; }

#hint {
  position: fixed;
  left: 50%;
  bottom: calc(132px + env(safe-area-inset-bottom));
  transform: translateX(-50%);
  padding: 6px 14px;
  border-radius: 999px;
  background: rgba(10, 30, 60, .38);
  font-size: 12.5px;
  white-space: nowrap;
  pointer-events: none;
  transition: opacity 1.2s;
}
#hint.hide { opacity: 0; }

#panel {
  position: fixed;
  left: 50%;
  bottom: calc(10px + env(safe-area-inset-bottom));
  transform: translateX(-50%);
  width: min(460px, calc(100vw - 16px));
  padding: 10px;
  border-radius: 18px;
  background: rgba(10, 30, 60, .42);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}
.row { display: flex; gap: 8px; align-items: center; }
.row + .row { margin-top: 10px; }

button {
  flex: 1 1 0;
  min-width: 0;
  height: 46px;
  padding: 0 4px;
  border: 0;
  border-radius: 12px;
  background: rgba(255, 255, 255, .16);
  color: #fff;
  font: inherit;
  font-size: 14px;
  font-weight: 600;
  white-space: nowrap;
  touch-action: manipulation;
  transition: transform .08s, background .15s;
}
button:active { transform: scale(.94); background: rgba(255, 255, 255, .32); }
button.on { background: rgba(255, 210, 63, .85); color: #3a2a00; }

.slider label { font-size: 13px; font-weight: 600; padding: 0 6px 0 4px; }
input[type=range] {
  flex: 1;
  height: 32px;
  margin: 0;
  background: transparent;
  -webkit-appearance: none;
  appearance: none;
  touch-action: pan-y;
}
input[type=range]::-webkit-slider-runnable-track { height: 6px; border-radius: 3px; background: rgba(255, 255, 255, .35); }
input[type=range]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 26px; height: 26px; margin-top: -10px;
  border-radius: 50%;
  background: #ffd23f;
  border: 3px solid #fff;
  box-shadow: 0 2px 6px rgba(0, 0, 0, .3);
}
input[type=range]::-moz-range-track { height: 6px; border-radius: 3px; background: rgba(255, 255, 255, .35); }
input[type=range]::-moz-range-thumb { width: 22px; height: 22px; border-radius: 50%; background: #ffd23f; border: 3px solid #fff; }

#loading {
  position: fixed; inset: 0;
  display: flex; align-items: center; justify-content: center;
  background: linear-gradient(#2f7fe0, #bfe3f7);
  font-size: 18px; letter-spacing: .2em;
  transition: opacity .6s;
  pointer-events: none;
}
#loading.hide { opacity: 0; }

#err {
  display: none;
  position: fixed; left: 8px; right: 8px; top: 70px;
  margin: 0; padding: 10px;
  max-height: 40vh; overflow: auto;
  border-radius: 10px;
  background: rgba(120, 0, 0, .85);
  font-size: 11px; white-space: pre-wrap; word-break: break-all;
}

@media (max-height: 480px) and (orientation: landscape) {
  #panel { width: min(560px, calc(100vw - 16px)); padding: 6px; }
  #panel .row + .row { margin-top: 4px; }
  button { height: 38px; }
  #hint { bottom: calc(100px + env(safe-area-inset-bottom)); }
}