:root {
  --panel-bg: rgba(10, 16, 28, 0.68);
  --panel-border: rgba(255, 255, 255, 0.18);
  --panel-text: #eef6ff;
  --panel-muted: rgba(238, 246, 255, 0.72);
  --button-bg: rgba(255, 255, 255, 0.12);
  --button-bg-hover: rgba(255, 255, 255, 0.2);
  --button-border: rgba(255, 255, 255, 0.22);
  --accent: #ffd36a;
  --hud-panel-width: min(310px, calc(100vw - 88px));
  --under-stage-blur-amount: 0;
  --under-stage-blur-px: 0px;
  --under-stage-canvas-blur-px: 0px;
  --button-shock-flash-opacity: 0;
  --button-shock-grayscale: 0;
  --button-shock-contrast: 1;
  --button-shock-brightness: 1;
  --button-shock-saturate: 1;
  --button-shock-shake-x: 0px;
  --button-shock-shake-y: 0px;
  --button-shock-scale: 0;
}

* { box-sizing: border-box; }

html,
body,
#app {
  width: 100%;
  height: 100%;
  margin: 0;
  overflow: hidden;
  background:
    radial-gradient(circle at 20% 10%, rgba(80, 120, 170, 0.35), transparent 34%),
    radial-gradient(circle at 84% 28%, rgba(255, 211, 106, 0.16), transparent 28%),
    linear-gradient(145deg, #070a10 0%, #101929 48%, #040507 100%);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

#app::before {
  content: "";
  position: fixed;
  inset: -4px;
  z-index: 12;
  pointer-events: none;
  opacity: var(--button-shock-flash-opacity);
  background:
    radial-gradient(circle at 50% 42%, rgba(255, 255, 255, 0.96), rgba(255, 255, 255, 0.44) 42%, rgba(255, 255, 255, 0.0) 72%),
    linear-gradient(180deg, rgba(255,255,255,0.64), rgba(255,255,255,0.18));
  mix-blend-mode: screen;
  transition: opacity 80ms linear;
}

#app::after {
  content: "";
  position: fixed;
  inset: -2px;
  z-index: 10;
  pointer-events: none;
  opacity: var(--under-stage-blur-amount);
  background:
    radial-gradient(circle at 50% 40%, rgba(12, 18, 30, 0.06), rgba(2, 4, 9, 0.42)),
    linear-gradient(180deg, rgba(7, 10, 16, 0.10), rgba(0, 0, 0, 0.44));
  backdrop-filter: blur(var(--under-stage-blur-px)) saturate(108%);
  -webkit-backdrop-filter: blur(var(--under-stage-blur-px)) saturate(108%);
  transition: opacity 180ms ease;
}

#rube-canvas {
  display: block;
  width: 100%;
  height: 100%;
  touch-action: none;
  cursor: default;
  filter:
    blur(var(--under-stage-canvas-blur-px))
    grayscale(var(--button-shock-grayscale))
    contrast(var(--button-shock-contrast))
    brightness(var(--button-shock-brightness))
    saturate(var(--button-shock-saturate));
  transform:
    translate(var(--button-shock-shake-x), var(--button-shock-shake-y))
    scale(calc(1 + (var(--under-stage-blur-amount) * 0.006) + var(--button-shock-scale)));
  transform-origin: center center;
}

#rube-canvas.is-ball-hover { cursor: pointer; }
#rube-canvas.is-dragging { cursor: grabbing; }
#rube-canvas.is-free-mouse { cursor: grab; }
#rube-canvas.is-free-mouse.is-dragging { cursor: grabbing; }

.hud-drawer-toggle {
  position: fixed;
  top: 18px;
  left: 12px;
  z-index: 25;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-width: 46px;
  min-height: 42px;
  padding: 0 13px;
  border-radius: 999px;
  box-shadow: 0 18px 48px rgba(0, 0, 0, 0.34);
  backdrop-filter: blur(18px) saturate(140%);
  -webkit-backdrop-filter: blur(18px) saturate(140%);
  transition: transform 260ms cubic-bezier(0.2, 0.86, 0.22, 1), background 160ms ease, opacity 160ms ease;
}

.hud-drawer-toggle__icon {
  font-size: 1.05rem;
  line-height: 1;
}

.hud-drawer-toggle__text {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

#app.is-hud-open .hud-drawer-toggle {
  transform: translateX(calc(var(--hud-panel-width) + 20px));
}

.hud {
  position: fixed;
  top: 18px;
  left: 18px;
  width: var(--hud-panel-width);
  z-index: 20;
  max-height: calc(100vh - 36px);
  padding: 16px;
  overflow-y: auto;
  overscroll-behavior: contain;
  color: var(--panel-text);
  border: 1px solid var(--panel-border);
  border-radius: 22px;
  background: var(--panel-bg);
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.35);
  backdrop-filter: blur(18px) saturate(140%);
  -webkit-backdrop-filter: blur(18px) saturate(140%);
  scrollbar-width: thin;
  scrollbar-color: rgba(255,255,255,0.28) rgba(0,0,0,0.12);
  transform: translateX(calc(-100% - 30px));
  transition: transform 260ms cubic-bezier(0.2, 0.86, 0.22, 1);
}

#app.is-hud-open .hud {
  transform: translateX(0);
}

/* Instant close is used when Start is pressed on tablet/mobile portrait
   so the panel never blocks the opening action. */
#app.is-hud-instant .hud,
#app.is-hud-instant .hud-drawer-toggle {
  transition: none !important;
}

.hud::-webkit-scrollbar {
  width: 8px;
}

.hud::-webkit-scrollbar-track {
  background: rgba(0,0,0,0.12);
  border-radius: 999px;
}

.hud::-webkit-scrollbar-thumb {
  background: rgba(255,255,255,0.26);
  border-radius: 999px;
}

.hud__title {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
}

.hud__title strong { display: block; font-size: 1.02rem; }
.hud__title small { display: block; margin-top: 2px; color: var(--panel-muted); }

.hud__dot {
  width: 13px;
  height: 13px;
  border-radius: 999px;
  background: var(--accent);
  box-shadow: 0 0 22px var(--accent);
}

.hud__buttons {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
}

button {
  min-height: 42px;
  border: 1px solid var(--button-border);
  border-radius: 14px;
  color: var(--panel-text);
  background: var(--button-bg);
  font: inherit;
  font-weight: 700;
  cursor: pointer;
  transition: transform 160ms ease, background 160ms ease, opacity 160ms ease;
}

button:hover:not(:disabled) {
  transform: translateY(-1px);
  background: var(--button-bg-hover);
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.45;
}

.hud__field {
  display: grid;
  gap: 7px;
  margin: 14px 0 10px;
  padding: 12px;
  border: 1px solid rgba(255,255,255,0.14);
  border-radius: 16px;
}

.hud__field legend {
  padding: 0 6px;
  color: var(--panel-muted);
  font-size: 0.82rem;
}

.hud__field label,
.hud__toggle {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--panel-text);
  cursor: pointer;
}

.hud__accordion {
  margin: 12px 0 8px;
  border: 1px solid rgba(255,255,255,0.14);
  border-radius: 16px;
  background: rgba(0, 0, 0, 0.10);
  overflow: hidden;
}

.hud__accordion summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 12px;
  color: var(--panel-text);
  cursor: pointer;
  user-select: none;
  list-style: none;
}

.hud__accordion summary::-webkit-details-marker {
  display: none;
}

.hud__accordion summary::after {
  content: "▾";
  color: var(--panel-muted);
  font-size: 0.8rem;
  transition: transform 160ms ease;
}

.hud__accordion[open] summary::after {
  transform: rotate(180deg);
}

.hud__accordion summary span {
  font-size: 0.82rem;
  font-weight: 700;
}

.hud__accordion summary small {
  margin-left: auto;
  color: var(--panel-muted);
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.hud__accordion .hud__field {
  margin: 0;
  border: 0;
  border-top: 1px solid rgba(255,255,255,0.10);
  border-radius: 0;
  background: rgba(0, 0, 0, 0.08);
}

.hud__sliders {
  gap: 9px;
}

.hud__range {
  display: grid !important;
  gap: 6px;
  cursor: default;
}

.hud__range span {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  color: var(--panel-text);
  font-size: 0.82rem;
}

.hud__range output {
  min-width: 42px;
  text-align: right;
  color: var(--panel-muted);
  font: 700 0.76rem/1 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

.hud__range input[type="range"] {
  width: 100%;
  accent-color: var(--accent);
  cursor: pointer;
}

.hud__toggle {
  padding: 10px 2px 4px;
}

.camera-readout {
  display: none;
  margin: 10px 0 4px;
  padding: 10px;
  border: 1px solid rgba(255,255,255,0.14);
  border-radius: 14px;
  background: rgba(0, 0, 0, 0.18);
}

.camera-readout.is-active {
  display: block;
}

.camera-readout__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 7px;
}

.camera-readout__head strong {
  font-size: 0.82rem;
}

.camera-readout__head small {
  color: var(--panel-muted);
  font-size: 0.74rem;
}

.camera-readout pre {
  margin: 0;
  white-space: pre-wrap;
  color: rgba(238, 246, 255, 0.88);
  font: 600 0.72rem/1.42 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  user-select: text;
}

.hud__hint {
  margin: 12px 0 0;
  color: var(--panel-muted);
  font-size: 0.86rem;
  line-height: 1.35;
}

.hud__hint--accordion {
  margin: 0;
  padding: 10px 12px 12px;
  border-top: 1px solid rgba(255,255,255,0.10);
  background: rgba(0, 0, 0, 0.08);
}

.loading {
  position: fixed;
  inset: 0;
  z-index: 40;
  display: grid;
  place-items: center;
  padding: 22px;
  background:
    radial-gradient(circle at 50% 36%, rgba(255, 211, 106, 0.10), transparent 34%),
    rgba(0, 0, 0, 0.72);
  transition: opacity 320ms ease, visibility 320ms ease;
}

.loading.is-hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.loading__card {
  width: min(520px, calc(100vw - 36px));
  padding: 28px;
  color: var(--panel-text);
  border: 1px solid var(--panel-border);
  border-radius: 26px;
  background: rgba(8, 12, 20, 0.82);
  box-shadow: 0 30px 90px rgba(0, 0, 0, 0.48);
  backdrop-filter: blur(18px) saturate(128%);
  -webkit-backdrop-filter: blur(18px) saturate(128%);
}

.loading__eyebrow {
  margin-bottom: 8px;
  color: var(--accent);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.loading__title {
  display: block;
  margin-bottom: 12px;
  font-size: clamp(1.35rem, 3vw, 2.25rem);
  line-height: 1.05;
}

.loading__percent {
  margin: 2px 0 10px;
  font: 800 clamp(2.4rem, 8vw, 4.6rem)/0.92 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  letter-spacing: -0.08em;
}

.loading__bar {
  position: relative;
  width: 100%;
  height: 10px;
  overflow: hidden;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.12);
  box-shadow: inset 0 0 0 1px rgba(255,255,255,0.10);
}

.loading__bar-fill {
  width: 0%;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, rgba(255, 211, 106, 0.76), rgba(255, 255, 255, 0.92));
  transition: width 180ms ease;
}

.loading__stage {
  display: block;
  margin-top: 14px;
  color: rgba(238, 246, 255, 0.96);
  font-size: clamp(0.98rem, 2.3vw, 1.2rem);
  font-weight: 800;
}

.loading__detail {
  display: block;
  min-height: 1.45em;
  margin-top: 4px;
  color: var(--panel-muted);
  font-size: 0.88rem;
  line-height: 1.4;
}


@media (orientation: portrait) and (max-width: 1024px) {
  .camera-readout {
    display: none !important;
  }
}

@media (max-width: 720px) {
  :root {
    --hud-panel-width: min(360px, calc(100vw - 64px));
  }

  .hud-drawer-toggle {
    top: 10px;
    left: 10px;
    width: 44px;
    min-width: 44px;
    min-height: 44px;
    padding: 0;
    border-radius: 16px;
  }

  .hud-drawer-toggle__text {
    display: none;
  }

  #app.is-hud-open .hud-drawer-toggle {
    transform: translateX(calc(var(--hud-panel-width) + 10px));
  }

  .hud {
    top: 10px;
    left: 10px;
    right: auto;
    bottom: 10px;
    width: var(--hud-panel-width);
    border-radius: 20px;
    max-height: calc(100vh - 20px);
    padding: 12px;
    transform: translateX(calc(-100% - 22px));
  }

  #app.is-hud-open .hud {
    transform: translateX(0);
  }

  .hud__buttons {
    grid-template-columns: repeat(3, 1fr);
    gap: 7px;
  }

  button { min-height: 40px; font-size: 0.86rem; }

  .hud__field {
    grid-template-columns: repeat(2, 1fr);
    margin: 10px 0 6px;
    padding: 10px;
  }

  .hud__accordion .hud__field {
    margin: 0;
  }

  .hud__field legend { grid-column: 1 / -1; }

  .camera-readout {
    display: none !important;
  }

  .hud__accordion {
    margin: 8px 0 6px;
  }

  .camera-readout pre {
    font-size: 0.66rem;
    line-height: 1.35;
  }

  .hud__hint { display: none; }
}