html,body { margin:0; padding:0; background:#000; color:#cdf6ff; height:100%;
              font-family: 'SF Mono', 'Menlo', 'Consolas', monospace; overflow:hidden; }
  #app { position:fixed; inset:0; }
  canvas {
    display:block;
    cursor: none;
  }
  #tron-disc-cursor {
    position: fixed;
    left: 0;
    top: 0;
    z-index: 80;
    width: 33px;
    height: 33px;
    pointer-events: none;
    opacity: 0;
    visibility: hidden;
    transform: translate3d(-100px, -100px, 0) translate(-50%, -50%) rotate(0deg);
    transition: none;
    will-change: transform, opacity;
    contain: layout paint style;
  }
  #tron-disc-cursor::before,
  #tron-disc-cursor::after {
    content: "";
    position: absolute;
    inset: 0;
    border-radius: 50%;
  }
  #tron-disc-cursor::before {
    background:
      radial-gradient(circle at 50% 50%, transparent 0 29%, rgba(0, 15, 18, 0.96) 30% 45%, transparent 46%),
      conic-gradient(from 0deg,
        rgba(97, 247, 255, 0.98) 0deg 32deg,
        rgba(97, 247, 255, 0.20) 32deg 54deg,
        transparent 54deg 93deg,
        rgba(210, 255, 255, 0.98) 93deg 102deg,
        transparent 102deg 181deg,
        rgba(97, 247, 255, 0.98) 181deg 213deg,
        rgba(97, 247, 255, 0.18) 213deg 236deg,
        transparent 236deg 292deg,
        rgba(210, 255, 255, 0.98) 292deg 302deg,
        transparent 302deg 360deg);
    -webkit-mask: radial-gradient(circle, transparent 0 34%, #000 35% 57%, transparent 58%);
    mask: radial-gradient(circle, transparent 0 34%, #000 35% 57%, transparent 58%);
    filter: drop-shadow(0 0 5px rgba(70, 244, 255, 0.95)) drop-shadow(0 0 11px rgba(33, 205, 224, 0.62));
  }
  #tron-disc-cursor::after {
    inset: 6px;
    border: 1.4px solid rgba(62, 246, 255, 0.92);
    border-left-color: rgba(62, 246, 255, 0.14);
    border-bottom-color: rgba(62, 246, 255, 0.28);
    box-shadow:
      0 0 5px rgba(70, 244, 255, 0.9),
      inset 0 0 6px rgba(70, 244, 255, 0.56);
  }
  #tron-disc-cursor .disc-core {
    position: absolute;
    inset: 12.5px;
    border-radius: 50%;
    border: 1px solid rgba(218, 255, 255, 0.94);
    box-shadow: 0 0 5px rgba(76, 245, 255, 0.9);
  }
  body.tron-disc-cursor-visible #tron-disc-cursor {
    opacity: 1;
    visibility: visible;
  }
  body.mouse-look-engaged #tron-disc-cursor,
  #tron-disc-cursor.is-hidden {
    opacity: 0 !important;
    visibility: hidden !important;
  }
  @media (hover: none), (pointer: coarse) {
    #tron-disc-cursor { display: none; }
    canvas { cursor: auto; }
  }
  .hud {
    position:fixed; pointer-events:none;
    background: rgba(2,9,11,0.55);
    border:1px solid rgba(98,247,255,0.35);
    color:#cdf6ff;
    padding:10px 14px;
    font-size:11px;
    line-height:1.55;
    letter-spacing:0.04em;
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
    font-variant-numeric: tabular-nums;
    contain: layout paint;
    text-shadow: 0 0 6px rgba(98,247,255,0.35);
    max-width: 380px;
  }
  .perf-live-overlay {
    display: grid;
    gap: 2px;
    width: min(258px, calc(100vw - 54px));
  }
  .perf-live-row {
    display: flex;
    justify-content: space-between;
    gap: 12px;
    white-space: nowrap;
  }
  .perf-live-row span:first-child {
    color: rgba(183, 239, 246, 0.72);
  }
  .perf-live-row strong,
  .perf-live-value {
    color: #f2feff;
    font-weight: 600;
    text-align: right;
  }
  .perf-live-primary strong {
    color: #5ff8ff;
    text-shadow: 0 0 8px rgba(95, 248, 255, 0.75);
  }
  .perf-live-muted .perf-live-value {
    color: rgba(205, 246, 255, 0.66);
  }
  .perf-live-warn .perf-live-value {
    color: #ffd36a;
  }
  .perf-live-bad .perf-live-value {
    color: #ff6e8f;
  }
  .perf-live-spike .perf-live-value {
    max-width: 176px;
    overflow: hidden;
    text-overflow: ellipsis;
  }
  @media (max-width: 760px), (hover: none), (pointer: coarse) {
    .hud {
      padding: 8px 10px;
      font-size: 10px;
      line-height: 1.45;
      max-width: calc(100vw - 24px);
    }
    .perf-live-overlay {
      width: min(220px, calc(100vw - 44px));
    }
    .perf-live-extra-mobile {
      display: none;
    }
  }
  #welcome-window-overlay {
    position: fixed;
    inset: 0;
    z-index: 36;
    display: grid;
    place-items: center;
    padding: 28px;
    pointer-events: none;
    opacity: 1;
    visibility: visible;
    transition: opacity 260ms cubic-bezier(0.16, 1, 0.3, 1), visibility 260ms ease;
  }
  #welcome-window-overlay.is-dismissed {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
  }
  .welcome-window {
    --welcome-base-x: 400px;
    --welcome-move-x: 0px;
    --welcome-move-y: 0px;
    --welcome-bend-y: 0deg;
    --welcome-tilt-x: 0deg;
    --welcome-origin-x: 50%;
    width: min(420px, calc(100vw - 56px));
    border: 1px solid #75a7ff;
    border-radius: 0;
    background: #061014;
    color: #d9fbff;
    box-shadow: none;
    overflow: hidden;
    contain: layout paint;
    transform:
      translateX(var(--welcome-base-x))
      translate3d(var(--welcome-move-x), var(--welcome-move-y), 0)
      perspective(900px)
      rotateY(var(--welcome-bend-y))
      rotateX(var(--welcome-tilt-x));
    transform-style: preserve-3d;
    transform-origin: var(--welcome-origin-x) 50%;
    transition: transform 260ms cubic-bezier(0.16, 1, 0.3, 1), border-color 180ms ease;
    will-change: transform;
  }
  #welcome-window-overlay.is-motion-active .welcome-window {
    transition-duration: 70ms, 180ms;
  }
  .welcome-titlebar {
    height: 24px;
    display: grid;
    grid-template-columns: 1fr auto;
    align-items: center;
    gap: 10px;
    padding: 0 4px 0 6px;
    background: #001f75;
    border-bottom: 1px solid #75a7ff;
  }
  .welcome-titlebar-title {
    min-width: 0;
    overflow: hidden;
    color: #e8feff;
    font-size: 10px;
    font-weight: 700;
    line-height: 1;
    letter-spacing: 0.02em;
    white-space: nowrap;
    text-overflow: ellipsis;
  }
  .welcome-titlebar-controls {
    display: flex;
    align-items: center;
    gap: 3px;
  }
  .welcome-titlebar-controls span {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 15px;
    height: 15px;
    border: 1px solid #75a7ff;
    background: #061014;
    color: #e8feff;
    font-size: 9px;
    font-weight: 700;
    line-height: 1;
  }
  .welcome-body {
    padding: 34px 36px 34px;
  }
  .welcome-body h2 {
    margin: 0 0 22px;
    color: #e8feff;
    font-size: 20px;
    line-height: 1.12;
    letter-spacing: 0;
  }
  .welcome-copy {
    margin: 0 0 36px;
    color: #a9dce4;
    font-size: 12.5px;
    line-height: 1.55;
    letter-spacing: 0;
    white-space: pre-wrap;
  }
  .welcome-action {
    display: flex;
    align-items: center;
    gap: 10px;
    color: #e8feff;
    font-size: 12px;
    line-height: 1.25;
    letter-spacing: 0.02em;
  }
  .welcome-action.is-touch-prompt {
    gap: 0;
  }
  .welcome-action.is-touch-prompt .welcome-action-prefix {
    display: none;
  }
  .welcome-key {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 82px;
    height: 31px;
    padding: 0 11px;
    border: 1px solid #75a7ff;
    background: transparent;
    color: #d9fbff;
    font-weight: 700;
  }
  @media (max-width: 560px) {
    #welcome-window-overlay {
      padding: 20px;
      align-items: end;
    }
    .welcome-body {
      padding: 30px 30px 32px;
    }
  }
  @media (hover: none), (pointer: coarse) {
    #welcome-window-overlay {
      pointer-events: auto;
    }
  }
  @media (prefers-reduced-motion: reduce) {
    .welcome-window {
      transition: none;
      will-change: auto;
    }
  }
  #hud-tl { top:14px; left:14px; }
  #hud-bl { bottom:14px; left:14px; }
  #mobile-performance-diagnostics {
    margin-top: 6px;
    max-width: min(320px, calc(100vw - 28px));
    white-space: pre-line;
    font-variant-numeric: tabular-nums;
    line-height: 1.35;
    color: rgba(205, 246, 255, 0.82);
    text-shadow: 0 0 8px rgba(98, 247, 255, 0.28);
  }
  #mobile-movement-pad {
    position: fixed;
    left: max(18px, env(safe-area-inset-left));
    bottom: max(18px, env(safe-area-inset-bottom));
    z-index: 55;
    width: 116px;
    height: 116px;
    border-radius: 50%;
    border: 1px solid rgba(98, 247, 255, 0.34);
    background:
      radial-gradient(circle at 50% 50%, rgba(98, 247, 255, 0.10), rgba(3, 18, 22, 0.28) 58%, rgba(0, 0, 0, 0.38) 100%);
    box-shadow:
      0 0 18px rgba(98, 247, 255, 0.18),
      inset 0 0 18px rgba(98, 247, 255, 0.08);
    pointer-events: auto;
    touch-action: none;
    user-select: none;
    opacity: 0;
    visibility: hidden;
    transform: translate3d(0, 8px, 0);
    transition: opacity 160ms ease, visibility 160ms ease, transform 160ms ease;
    contain: layout paint style;
  }
  #mobile-movement-pad::before,
  #mobile-movement-pad::after {
    content: "";
    position: absolute;
    inset: 18px;
    border-radius: 50%;
    border: 1px solid rgba(98, 247, 255, 0.18);
  }
  #mobile-movement-pad::after {
    inset: 50%;
    width: 1px;
    height: 1px;
    transform: translate(-50%, -50%);
    border: 0;
    box-shadow:
      -38px 0 0 rgba(98, 247, 255, 0.22),
      38px 0 0 rgba(98, 247, 255, 0.22),
      0 -38px 0 rgba(98, 247, 255, 0.22),
      0 38px 0 rgba(98, 247, 255, 0.22);
  }
  #mobile-movement-knob {
    position: absolute;
    left: 50%;
    top: 50%;
    width: 42px;
    height: 42px;
    border-radius: 50%;
    border: 1px solid rgba(232, 254, 255, 0.62);
    background: rgba(98, 247, 255, 0.18);
    box-shadow:
      0 0 14px rgba(98, 247, 255, 0.48),
      inset 0 0 10px rgba(232, 254, 255, 0.16);
    transform: translate3d(-50%, -50%, 0);
    pointer-events: none;
    will-change: transform;
  }
  body.mobile-landscape #mobile-movement-pad {
    opacity: 1;
    visibility: visible;
    transform: translate3d(0, 0, 0);
  }
  @media (hover: hover) and (pointer: fine) {
    #mobile-movement-pad {
      display: none;
    }
  }
  @media (min-width: 861px) and (hover: hover) and (pointer: fine) {
    #mobile-performance-diagnostics {
      display: none;
    }
  }
  #hud-controls {
    top:14px;
    right:14px;
    width: 380px;
    max-height: calc(100vh - 28px);
    box-sizing: border-box;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    pointer-events: auto;
    transition: opacity 180ms ease, transform 220ms cubic-bezier(0.22, 1, 0.36, 1), visibility 220ms ease;
    will-change: opacity, transform;
  }
  body.controls-hidden #hud-controls {
    opacity: 0;
    transform: translateX(calc(100% + 28px));
    visibility: hidden;
    pointer-events: none;
  }
  #settings-toggle {
    position: fixed;
    top: 14px;
    right: 408px;
    z-index: 40;
    min-width: 104px;
    border: 1px solid rgba(98,247,255,0.48);
    border-radius: 6px;
    background: rgba(3,18,22,0.76);
    color: #e8feff;
    padding: 9px 11px;
    font: inherit;
    font-size: 11px;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    cursor: pointer;
    pointer-events: auto;
    box-shadow: 0 0 18px rgba(98,247,255,0.12), inset 0 0 0 1px rgba(232,254,255,0.04);
    text-shadow: 0 0 6px rgba(98,247,255,0.35);
    contain: layout paint;
    transition: right 220ms cubic-bezier(0.22, 1, 0.36, 1), border-color 160ms ease, background 160ms ease;
  }
  #settings-toggle:hover {
    border-color: rgba(98,247,255,0.82);
    background: rgba(98,247,255,0.14);
  }
  body.controls-hidden #settings-toggle {
    right: 14px;
  }
  @media (max-width: 860px) {
    #settings-toggle {
      right: 14px;
      top: 14px;
    }
    #hud-controls {
      top: 62px;
      right: 14px;
      width: min(380px, calc(100vw - 28px));
      max-height: calc(100vh - 76px);
    }
  }
  .tag { color:#62f7ff; font-weight:700; }
  .dim { color:#7fa7ad; }
  .rule { height:1px; background:linear-gradient(90deg,#62f7ff44,transparent); margin:6px 0; }
  .control-row {
    display: grid;
    gap: 5px;
    margin: 9px 0 0;
    position: relative;
  }
  .control-row::after {
    content: "";
    position: absolute;
    left: 50%;
    bottom: 1px;
    width: 6px;
    height: 12px;
    border: 1px solid rgba(232,254,255,0.56);
    border-radius: 2px;
    background: rgba(98,247,255,0.20);
    box-shadow: 0 0 8px rgba(98,247,255,0.25);
    transform: translateX(-50%);
    pointer-events: none;
  }
  .control-row.select-row::after { display: none; }
  .control-head {
    display: flex;
    justify-content: space-between;
    gap: 12px;
  }
  .control-head output,
  .control-head .control-value {
    color: #e8feff;
    font-variant-numeric: tabular-nums;
  }
  input[type="range"] {
    width: 100%;
    accent-color: #62f7ff;
  }
  select.control-select {
    width: 100%;
    border: 1px solid rgba(98,247,255,0.35);
    background: rgba(3,18,22,0.82);
    color: #e8feff;
    border-radius: 6px;
    padding: 7px 8px;
    font: inherit;
    outline: none;
  }
  select.control-select:focus {
    border-color: rgba(98,247,255,0.78);
    box-shadow: 0 0 0 2px rgba(98,247,255,0.12);
  }
  .control-section {
    margin-top: 13px;
    color: #62f7ff;
    font-weight: 700;
    text-transform: uppercase;
  }
  .control-tabs {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin: 8px 0 10px;
  }
  .control-tab {
    border: 1px solid rgba(98,247,255,0.32);
    background: rgba(3,18,22,0.72);
    color: #9adce5;
    border-radius: 6px;
    padding: 5px 8px;
    font: inherit;
    cursor: pointer;
  }
  .control-tab.active {
    color: #e8feff;
    border-color: rgba(98,247,255,0.72);
    background: rgba(98,247,255,0.16);
  }
  .control-panels {
    flex: 1 1 auto;
    min-height: 0;
    max-height: none;
    overflow: auto;
    padding-right: 4px;
  }
  .control-panel { display: none; }
  .control-panel.active { display: block; }
  #hud-controls .control-tab:not([data-tab="movement"]):not([data-tab="character"]):not([data-tab="surface-reflections"]):not([data-tab="bloom-fx"]):not([data-tab="led-glow-fx"]):not([data-tab="central-building-leds"]):not([data-tab="wireframe-fx"]):not([data-tab="audio-fx"]):not([data-tab="atmosphere-fx"]):not([data-tab="performance-fx"]),
  #hud-controls .control-panel:not([data-panel="movement"]):not([data-panel="character"]):not([data-panel="surface-reflections"]):not([data-panel="bloom-fx"]):not([data-panel="led-glow-fx"]):not([data-panel="central-building-leds"]):not([data-panel="wireframe-fx"]):not([data-panel="audio-fx"]):not([data-panel="atmosphere-fx"]):not([data-panel="performance-fx"]) {
    display: none !important;
  }
  .control-box {
    margin-top: 12px;
    padding: 10px;
    border: 1px solid rgba(98,247,255,0.24);
    border-radius: 6px;
    background: rgba(3,18,22,0.38);
    box-shadow: inset 0 0 0 1px rgba(232,254,255,0.025);
  }
  .control-box .control-section:first-child {
    margin-top: 0;
  }
  .pose-grid {
    display: grid;
    gap: 8px;
    margin-top: 9px;
  }
  .pose-readout {
    border: 1px solid rgba(98,247,255,0.24);
    border-radius: 6px;
    background: rgba(3,18,22,0.44);
    padding: 8px 9px;
  }
  .pose-readout span {
    display: block;
    color: #62f7ff;
    font-size: 10px;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
  }
  .pose-readout output {
    display: block;
    margin-top: 4px;
    color: #e8feff;
    font-variant-numeric: tabular-nums;
    overflow-wrap: anywhere;
  }
  .control-actions-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
  }
  .control-actions-row .control-action {
    margin-top: 10px;
  }
  .control-action {
    width: 100%;
    margin-top: 10px;
    border: 1px solid rgba(98,247,255,0.45);
    background: rgba(98,247,255,0.10);
    color: #e8feff;
    border-radius: 6px;
    padding: 8px 10px;
    font: inherit;
    cursor: pointer;
  }
  .control-action:hover { background: rgba(98,247,255,0.18); }
  .control-action.saved {
    border-color: rgba(180,255,238,0.72);
    background: rgba(180,255,238,0.15);
  }
  #loader {
    position:fixed; inset:0; display:flex; align-items:center; justify-content:center;
    z-index:9999; background:#000; color:transparent; font-size:0;
  }
  #loader.hidden { display:none; }
  #boundary-error-overlay {
    position: fixed;
    left: 50%;
    top: 46%;
    z-index: 8;
    pointer-events: none;
    color: #e8feff;
    line-height: 1;
    opacity: 0;
    mix-blend-mode: screen;
    transform: translate(-50%, -50%);
    will-change: opacity, transform, filter;
  }
  .boundary-error-window {
    position: relative;
    min-width: 12.5ch;
    padding: 1.25em 1.55em 1.15em;
    border: 1px solid rgba(197,252,255,0.88);
    background:
      linear-gradient(180deg, rgba(105,242,255,0.13) 0 0.42em, rgba(4,16,20,0.78) 0.42em 100%),
      repeating-linear-gradient(180deg, rgba(177,250,255,0.10) 0 1px, transparent 1px 6px);
    box-shadow:
      0 0 0 1px rgba(98,247,255,0.18) inset,
      0 0 18px rgba(98,247,255,0.58),
      0 12px 44px rgba(0,0,0,0.62);
    transform: perspective(360px) rotateX(3deg) translateZ(0);
  }
  .boundary-error-window::after {
    content: "";
    position: absolute;
    inset: 0.7em 0.65em 0.55em;
    border: 1px solid rgba(98,247,255,0.24);
    transform: translate(0.18em, 0.16em);
    opacity: 0.52;
  }
  .boundary-error-x {
    position: absolute;
    top: 0.22em;
    right: 0.42em;
    color: rgba(232,254,255,0.94);
    font-weight: 900;
    font-size: 0.52em;
    letter-spacing: 0;
    text-shadow: 0 0 8px rgba(98,247,255,0.82);
  }
  .boundary-error-text {
    position: relative;
    z-index: 1;
    display: block;
    color: #e8feff;
    font-weight: 900;
    letter-spacing: 0.10em;
    text-shadow:
      0 0 3px rgba(232,254,255,0.92),
      0 0 12px rgba(98,247,255,0.82),
      0 0 32px rgba(98,247,255,0.45);
    transform: translate(-0.06em, -0.03em);
  }
  .boundary-error-text::before,
  .boundary-error-text::after {
    content: "//error";
    position: absolute;
    inset: 0;
    opacity: var(--error-glitch-opacity, 0);
    pointer-events: none;
  }
  .boundary-error-text::before {
    color: rgba(98,247,255,0.76);
    transform: translate(var(--error-glitch-x, 0), -0.015em);
  }
  .boundary-error-text::after {
    color: rgba(232,254,255,0.62);
    transform: translate(calc(var(--error-glitch-x, 0) * -0.62), 0.018em);
  }
  .err { color:#ff7777; }