/* BEGIN USAGE */
// animations.jsx
// Reusable animation starter: Stage, Timeline, Sprite, easing helpers.
// Exports (to window): Stage, Sprite, PlaybackBar, TextSprite, ImageSprite, RectSprite,
//   useTime, useTimeline, useSprite, Easing, interpolate, animate, clamp.
//
// Usage (in an HTML file that loads React + Babel):
//
//   <Stage width={1280} height={720} duration={10} background="#f6f4ef">
//     <MyScene />
//   </Stage>
//
// <Stage> auto-scales to the viewport and provides the scrubber, play/pause,
// ←/→ seek, space, and 0-to-reset controls, and persists the playhead.
// Set the optional `poster` prop (seconds) to the moment your opening scene is
// fully composed — the product thumbnail freezes on that frame (default ~1s).
// Inside <Stage>, any child can call useTime() to read the current
// playhead (seconds). Or wrap content in <Sprite start={1} end={4}>...</Sprite>
// to only render during that window -- children receive a `localTime` and
// `progress` via the useSprite() hook. Use Easing + interpolate()/animate()
// for tweens; TextSprite / ImageSprite / RectSprite have built-in entry/exit.
// Build YOUR scenes by composing Sprites inside a Stage.
/* END USAGE */
// ─────────────────────────────────────────────────────────────────────────────

// ── Easing functions (hand-rolled, Popmotion-style) ─────────────────────────
// All easings take t ∈ [0,1] and return eased t ∈ [0,1] (may overshoot for back/elastic).
const Easing = {
  linear: (t) => t,

  // Quad
  easeInQuad:    (t) => t * t,
  easeOutQuad:   (t) => t * (2 - t),
  easeInOutQuad: (t) => (t < 0.5 ? 2 * t * t : -1 + (4 - 2 * t) * t),

  // Cubic
  easeInCubic:    (t) => t * t * t,
  easeOutCubic:   (t) => (--t) * t * t + 1,
  easeInOutCubic: (t) => (t < 0.5 ? 4 * t * t * t : (t - 1) * (2 * t - 2) * (2 * t - 2) + 1),

  // Quart
  easeInQuart:    (t) => t * t * t * t,
  easeOutQuart:   (t) => 1 - (--t) * t * t * t,
  easeInOutQuart: (t) => (t < 0.5 ? 8 * t * t * t * t : 1 - 8 * (--t) * t * t * t),

  // Expo
  easeInExpo:  (t) => (t === 0 ? 0 : Math.pow(2, 10 * (t - 1))),
  easeOutExpo: (t) => (t === 1 ? 1 : 1 - Math.pow(2, -10 * t)),
  easeInOutExpo: (t) => {
    if (t === 0) return 0;
    if (t === 1) return 1;
    if (t < 0.5) return 0.5 * Math.pow(2, 20 * t - 10);
    return 1 - 0.5 * Math.pow(2, -20 * t + 10);
  },

  // Sine
  easeInSine:    (t) => 1 - Math.cos((t * Math.PI) / 2),
  easeOutSine:   (t) => Math.sin((t * Math.PI) / 2),
  easeInOutSine: (t) => -(Math.cos(Math.PI * t) - 1) / 2,

  // Back (overshoot)
  easeOutBack: (t) => {
    const c1 = 1.70158, c3 = c1 + 1;
    return 1 + c3 * Math.pow(t - 1, 3) + c1 * Math.pow(t - 1, 2);
  },
  easeInBack: (t) => {
    const c1 = 1.70158, c3 = c1 + 1;
    return c3 * t * t * t - c1 * t * t;
  },
  easeInOutBack: (t) => {
    const c1 = 1.70158, c2 = c1 * 1.525;
    return t < 0.5
      ? (Math.pow(2 * t, 2) * ((c2 + 1) * 2 * t - c2)) / 2
      : (Math.pow(2 * t - 2, 2) * ((c2 + 1) * (t * 2 - 2) + c2) + 2) / 2;
  },

  // Elastic
  easeOutElastic: (t) => {
    const c4 = (2 * Math.PI) / 3;
    if (t === 0) return 0;
    if (t === 1) return 1;
    return Math.pow(2, -10 * t) * Math.sin((t * 10 - 0.75) * c4) + 1;
  },
};

// ── Core interpolation helpers ──────────────────────────────────────────────

// Clamp a value to [min, max]
const clamp = (v, min, max) => Math.max(min, Math.min(max, v));

// interpolate([0, 0.5, 1], [0, 100, 50], ease?) -> fn(t)
// Popmotion-style: linearly maps t across input keyframes to output values,
// with optional easing per segment (single fn or array of fns).
function interpolate(input, output, ease = Easing.linear) {
  return (t) => {
    if (t <= input[0]) return output[0];
    if (t >= input[input.length - 1]) return output[output.length - 1];
    for (let i = 0; i < input.length - 1; i++) {
      if (t >= input[i] && t <= input[i + 1]) {
        const span = input[i + 1] - input[i];
        const local = span === 0 ? 0 : (t - input[i]) / span;
        const easeFn = Array.isArray(ease) ? (ease[i] || Easing.linear) : ease;
        const eased = easeFn(local);
        return output[i] + (output[i + 1] - output[i]) * eased;
      }
    }
    return output[output.length - 1];
  };
}

// animate({from, to, start, end, ease})(t) — simpler single-segment tween.
// Returns `from` before `start`, `to` after `end`.
function animate({ from = 0, to = 1, start = 0, end = 1, ease = Easing.easeInOutCubic }) {
  return (t) => {
    if (t <= start) return from;
    if (t >= end) return to;
    const local = (t - start) / (end - start);
    return from + (to - from) * ease(local);
  };
}

// ── Timeline context ────────────────────────────────────────────────────────

const TimelineContext = React.createContext({ time: 0, duration: 10, playing: false });

const useTime = () => React.useContext(TimelineContext).time;
const useTimeline = () => React.useContext(TimelineContext);

// ── Sprite ──────────────────────────────────────────────────────────────────
// Renders children only when the playhead is inside [start, end]. Provides
// a sub-context with `localTime` (seconds since start) and `progress` (0..1).
//
//   <Sprite start={2} end={5}>
//     {({ localTime, progress }) => <Thing x={progress * 100} />}
//   </Sprite>
//
// Or as a plain wrapper — children can call useSprite() themselves.

const SpriteContext = React.createContext({ localTime: 0, progress: 0, duration: 0 });
const useSprite = () => React.useContext(SpriteContext);

function Sprite({ start = 0, end = Infinity, children, keepMounted = false }) {
  const { time } = useTimeline();
  const visible = time >= start && time <= end;
  if (!visible && !keepMounted) return null;

  const duration = end - start;
  const localTime = Math.max(0, time - start);
  const progress = duration > 0 && isFinite(duration)
    ? clamp(localTime / duration, 0, 1)
    : 0;

  const value = { localTime, progress, duration, visible };

  return (
    <SpriteContext.Provider value={value}>
      {typeof children === 'function' ? children(value) : children}
    </SpriteContext.Provider>
  );
}

// ── Sample sprite components ────────────────────────────────────────────────

// TextSprite: fades/slides text in on entry, holds, then fades out on exit.
// Props: text, x, y, size, color, font, entryDur, exitDur, align
function TextSprite({
  text,
  x = 0, y = 0,
  size = 48,
  color = '#111',
  font = 'Inter, system-ui, sans-serif',
  weight = 600,
  entryDur = 0.45,
  exitDur = 0.35,
  entryEase = Easing.easeOutBack,
  exitEase = Easing.easeInCubic,
  align = 'left',
  letterSpacing = '-0.01em',
}) {
  const { localTime, duration } = useSprite();
  const exitStart = Math.max(0, duration - exitDur);

  let opacity = 1;
  let ty = 0;

  if (localTime < entryDur) {
    const t = entryEase(clamp(localTime / entryDur, 0, 1));
    opacity = t;
    ty = (1 - t) * 16;
  } else if (localTime > exitStart) {
    const t = exitEase(clamp((localTime - exitStart) / exitDur, 0, 1));
    opacity = 1 - t;
    ty = -t * 8;
  }

  const translateX = align === 'center' ? '-50%' : align === 'right' ? '-100%' : '0';

  return (
    <div style={{
      position: 'absolute',
      left: x, top: y,
      transform: `translate(${translateX}, ${ty}px)`,
      opacity,
      fontFamily: font,
      fontSize: size,
      fontWeight: weight,
      color,
      letterSpacing,
      whiteSpace: 'pre',
      lineHeight: 1.1,
      willChange: 'transform, opacity',
    }}>
      {text}
    </div>
  );
}

// ImageSprite: scales + fades in; optional Ken Burns drift during hold.
function ImageSprite({
  src,
  x = 0, y = 0,
  width = 400, height = 300,
  entryDur = 0.6,
  exitDur = 0.4,
  kenBurns = false,
  kenBurnsScale = 1.08,
  radius = 12,
  fit = 'cover',
  placeholder = null, // {label: string} for striped placeholder
}) {
  const { localTime, duration } = useSprite();
  const exitStart = Math.max(0, duration - exitDur);

  let opacity = 1;
  let scale = 1;

  if (localTime < entryDur) {
    const t = Easing.easeOutCubic(clamp(localTime / entryDur, 0, 1));
    opacity = t;
    scale = 0.96 + 0.04 * t;
  } else if (localTime > exitStart) {
    const t = Easing.easeInCubic(clamp((localTime - exitStart) / exitDur, 0, 1));
    opacity = 1 - t;
    scale = (kenBurns ? kenBurnsScale : 1) + 0.02 * t;
  } else if (kenBurns) {
    const holdSpan = exitStart - entryDur;
    const holdT = holdSpan > 0 ? (localTime - entryDur) / holdSpan : 0;
    scale = 1 + (kenBurnsScale - 1) * holdT;
  }

  const content = placeholder ? (
    <div style={{
      width: '100%', height: '100%',
      display: 'flex', alignItems: 'center', justifyContent: 'center',
      background: 'repeating-linear-gradient(135deg, #e9e6df 0 10px, #dcd8cf 10px 20px)',
      color: '#6b6458',
      fontFamily: 'JetBrains Mono, ui-monospace, monospace',
      fontSize: 13,
      letterSpacing: '0.04em',
      textTransform: 'uppercase',
    }}>
      {placeholder.label || 'image'}
    </div>
  ) : (
    <img src={src} alt="" style={{ width: '100%', height: '100%', objectFit: fit, display: 'block' }} />
  );

  return (
    <div style={{
      position: 'absolute',
      left: x, top: y,
      width, height,
      opacity,
      transform: `scale(${scale})`,
      transformOrigin: 'center',
      borderRadius: radius,
      overflow: 'hidden',
      willChange: 'transform, opacity',
    }}>
      {content}
    </div>
  );
}

// RectSprite: simple rectangle that animates position/size/color via props.
// Useful demo primitive — takes a `render` fn for per-frame customization.
function RectSprite({
  x = 0, y = 0,
  width = 100, height = 100,
  color = '#111',
  radius = 8,
  entryDur = 0.4,
  exitDur = 0.3,
  render, // optional: (ctx) => style overrides
}) {
  const spriteCtx = useSprite();
  const { localTime, duration } = spriteCtx;
  const exitStart = Math.max(0, duration - exitDur);

  let opacity = 1;
  let scale = 1;

  if (localTime < entryDur) {
    const t = Easing.easeOutBack(clamp(localTime / entryDur, 0, 1));
    opacity = clamp(localTime / entryDur, 0, 1);
    scale = 0.4 + 0.6 * t;
  } else if (localTime > exitStart) {
    const t = Easing.easeInQuad(clamp((localTime - exitStart) / exitDur, 0, 1));
    opacity = 1 - t;
    scale = 1 - 0.15 * t;
  }

  const overrides = render ? render(spriteCtx) : {};

  return (
    <div style={{
      position: 'absolute',
      left: x, top: y,
      width, height,
      background: color,
      borderRadius: radius,
      opacity,
      transform: `scale(${scale})`,
      transformOrigin: 'center',
      willChange: 'transform, opacity',
      ...overrides,
    }} />
  );
}


function Stage({
  width = 1280,
  height = 720,
  duration = 10,
  background = '#f6f4ef',
  fps = 60,
  loop = true,
  autoplay = true,
  poster = null,
  persistKey = 'animstage',
  children,
}) {
  // Thumbnail capture mode: the host appends ?thumbnail=1 before screenshotting.
  // Freeze on a representative still — the author-declared `poster` second, or
  // ~1s as a fallback — paused, with the playback bar hidden, so the product
  // thumbnail is a deterministic frame of the first composed scene.
  const captureMode = typeof location !== 'undefined' && /[?&]thumbnail=/.test(location.search || '');

  const [time, setTime] = React.useState(() => {
    if (captureMode) return clamp(poster == null ? 1 : poster, 0, duration);
    try {
      const v = parseFloat(localStorage.getItem(persistKey + ':t') || '0');
      return isFinite(v) ? clamp(v, 0, duration) : 0;
    } catch { return 0; }
  });
  const [playing, setPlaying] = React.useState(captureMode ? false : autoplay);
  const [scale, setScale] = React.useState(1);

  const stageRef = React.useRef(null);
  const canvasRef = React.useRef(null);
  const rafRef = React.useRef(null);
  const lastTsRef = React.useRef(null);

  // Persist playhead
  React.useEffect(() => {
    try { localStorage.setItem(persistKey + ':t', String(time)); } catch {}
  }, [time, persistKey]);

  // Auto-scale to fit viewport
  React.useEffect(() => {
    if (!stageRef.current) return;
    const el = stageRef.current;
    const measure = () => {
      const barH = captureMode ? 0 : 44; // playback bar height (hidden in capture mode)
      const s = Math.min(
        el.clientWidth / width,
        (el.clientHeight - barH) / height
      );
      setScale(Math.max(0.05, s));
    };
    measure();
    const ro = new ResizeObserver(measure);
    ro.observe(el);
    window.addEventListener('resize', measure);
    return () => {
      ro.disconnect();
      window.removeEventListener('resize', measure);
    };
  }, [width, height]);

  // Animation loop
  React.useEffect(() => {
    if (!playing) {
      lastTsRef.current = null;
      return;
    }
    const step = (ts) => {
      if (lastTsRef.current == null) lastTsRef.current = ts;
      const dt = (ts - lastTsRef.current) / 1000;
      lastTsRef.current = ts;
      setTime((t) => {
        let next = t + dt;
        if (next >= duration) {
          if (loop) next = next % duration;
          else { next = duration; setPlaying(false); }
        }
        return next;
      });
      rafRef.current = requestAnimationFrame(step);
    };
    rafRef.current = requestAnimationFrame(step);
    return () => {
      if (rafRef.current) cancelAnimationFrame(rafRef.current);
      lastTsRef.current = null;
    };
  }, [playing, duration, loop]);

  // Keyboard: space = play/pause, ← → = seek
  React.useEffect(() => {
    const onKey = (e) => {
      if (e.target && (e.target.tagName === 'INPUT' || e.target.tagName === 'TEXTAREA')) return;
      if (e.code === 'Space') {
        e.preventDefault();
        setPlaying(p => !p);
      } else if (e.code === 'ArrowLeft') {
        setTime(t => clamp(t - (e.shiftKey ? 1 : 0.1), 0, duration));
      } else if (e.code === 'ArrowRight') {
        setTime(t => clamp(t + (e.shiftKey ? 1 : 0.1), 0, duration));
      } else if (e.key === '0' || e.code === 'Home') {
        setTime(0);
      }
    };
    window.addEventListener('keydown', onKey);
    return () => window.removeEventListener('keydown', onKey);
  }, [duration]);

  const ctxValue = React.useMemo(
    () => ({ time, duration, playing, setTime, setPlaying }),
    [time, duration, playing]
  );

  return (
    <div
      ref={stageRef}
      style={{
        position: 'absolute', inset: 0,
        display: 'flex', flexDirection: 'column',
        alignItems: 'center',
        background: '#0a0a0a',
        fontFamily: 'Inter, system-ui, sans-serif',
      }}
    >
      {/* Canvas area — vertically centered in remaining space */}
      <div style={{
        flex: 1,
        width: '100%',
        display: 'flex', alignItems: 'center', justifyContent: 'center',
        overflow: 'hidden',
        minHeight: 0,
      }}>
        <div
          ref={canvasRef}
          style={{
            width, height,
            background,
            position: 'relative',
            transform: `scale(${scale})`,
            transformOrigin: 'center',
            flexShrink: 0,
            boxShadow: '0 20px 60px rgba(0,0,0,0.4)',
            overflow: 'hidden',
          }}
        >
          <TimelineContext.Provider value={ctxValue}>
            {children}
          </TimelineContext.Provider>
        </div>
      </div>

      {/* Playback bar — stacked below canvas, never overlapping. Hidden in
          capture mode so the thumbnail is just the frame, no chrome. */}
      {!captureMode && (
        <PlaybackBar
          time={time}
          duration={duration}
          playing={playing}
          onPlayPause={() => setPlaying(p => !p)}
          onReset={() => { setTime(0); }}
          onSeek={(t) => setTime(t)}
        />
      )}
    </div>
  );
}

// ── Playback bar ────────────────────────────────────────────────────────────
// Play/pause, return-to-begin, scrub track, time display.
// Uses fixed-width time fields so layout doesn't thrash.

function PlaybackBar({ time, duration, playing, onPlayPause, onReset, onSeek }) {
  const trackRef = React.useRef(null);
  const [dragging, setDragging] = React.useState(false);
  const [trackHover, setTrackHover] = React.useState(null); // { x, t } — px within track + hovered time

  const posFromEvent = React.useCallback((e) => {
    const rect = trackRef.current.getBoundingClientRect();
    const x = clamp(e.clientX - rect.left, 0, rect.width);
    const t = rect.width > 0 ? (x / rect.width) * duration : 0;
    return { x, t };
  }, [duration]);

  const onTrackMove = (e) => {
    if (!trackRef.current) return;
    const { x, t } = posFromEvent(e);
    setTrackHover({ x, t });
    if (dragging) onSeek(t);
  };

  const onTrackLeave = () => {
    if (!dragging) setTrackHover(null);
  };

  const onTrackDown = (e) => {
    const { x, t } = posFromEvent(e);
    setDragging(true);
    setTrackHover({ x, t });
    onSeek(t);
  };

  // Grab the knob in place: begin dragging without seeking (no jump).
  // stopPropagation keeps the track's click-to-seek from also firing.
  const onBallDown = (e) => {
    e.stopPropagation();
    setDragging(true);
    setTrackHover(posFromEvent(e));
  };

  React.useEffect(() => {
    if (!dragging) return;
    const prevCursor = document.body.style.cursor;
    document.body.style.cursor = 'grabbing'; // stays grabbing even if the pointer leaves the knob mid-drag
    const onUp = () => {
      setDragging(false);
      setTrackHover(null);
    };
    const onMove = (e) => {
      if (!trackRef.current) return;
      const { x, t } = posFromEvent(e);
      setTrackHover({ x, t });
      onSeek(t);
    };
    window.addEventListener('mouseup', onUp);
    window.addEventListener('mousemove', onMove);
    return () => {
      window.removeEventListener('mouseup', onUp);
      window.removeEventListener('mousemove', onMove);
      document.body.style.cursor = prevCursor;
    };
  }, [dragging, posFromEvent, onSeek]);

  const pct = duration > 0 ? (time / duration) * 100 : 0;
  const fmt = (t) => {
    const total = Math.max(0, t);
    const m = Math.floor(total / 60);
    const s = Math.floor(total % 60);
    return `${String(m).padStart(2, '0')}:${String(s).padStart(2, '0')}`;
  };

  const numFont = '"PingFang SC", -apple-system, BlinkMacSystemFont, system-ui, sans-serif';

  return (
    <div style={{
      display: 'flex', alignItems: 'center', gap: 12,
      padding: '12px',
      background: 'linear-gradient(0deg, rgba(0, 0, 0, 0.30) 0%, rgba(0, 0, 0, 0.00) 100%)',
      width: '100%',
      color: '#fff',
      fontFamily: numFont,
      userSelect: 'none',
      flexShrink: 0,
      boxSizing: 'border-box',
    }}>
      {/* Play / pause — bare white triangle, no button chrome */}
      <IconButton onClick={onPlayPause} tooltip={playing ? '暂停' : '播放'}>
        {playing ? (
          <svg width="16" height="16" viewBox="0 0 16 16" fill="none" xmlns="http://www.w3.org/2000/svg">
            <path d="M3.33333 1.33398C2.59695 1.33398 2 1.93094 2 2.66732V13.334C2 14.0704 2.59695 14.6673 3.33333 14.6673H4.66667C5.40305 14.6673 6 14.0704 6 13.334V2.66732C6 1.93094 5.40305 1.33398 4.66667 1.33398H3.33333Z" fill="currentColor"/>
            <path d="M11.3333 1.33398C10.597 1.33398 10 1.93094 10 2.66732V13.334C10 14.0704 10.597 14.6673 11.3333 14.6673H12.6667C13.403 14.6673 14 14.0704 14 13.334V2.66732C14 1.93094 13.403 1.33398 12.6667 1.33398H11.3333Z" fill="currentColor"/>
          </svg>
        ) : (
          <svg width="16" height="16" viewBox="0 0 16 16" fill="none" xmlns="http://www.w3.org/2000/svg">
            <path d="M14.0489 9.13127C14.873 8.60116 14.873 7.39754 14.0489 6.86743L4.74461 0.882617C3.84764 0.305661 2.66699 0.948902 2.66699 2.01454V13.9842C2.66699 15.0498 3.84764 15.693 4.74461 15.1161L14.0489 9.13127Z" fill="currentColor"/>
          </svg>
        )}
      </IconButton>

      {/* Current time */}
      <div style={{
        fontFamily: numFont,
        fontSize: 14,
        fontWeight: 400,
        fontVariantNumeric: 'tabular-nums',
        color: '#fff',
        minWidth: 40,
        textAlign: 'center'
      }}>
        {fmt(time)}
      </div>

      {/* Scrub track — white fill on translucent-white rail + draggable knob */}
      <div
        ref={trackRef}
        onMouseMove={onTrackMove}
        onMouseLeave={onTrackLeave}
        onMouseDown={onTrackDown}
        style={{
          flex: 1,
          height: 20,
          position: 'relative',
          cursor: 'pointer',
          display: 'flex', alignItems: 'center',
        }}
      >
        <div style={{
          position: 'absolute',
          left: 0, right: 0, height: 4,
          background: 'rgba(255,255,255,0.6)',
          borderRadius: 2,
        }}/>
        <div style={{
          position: 'absolute',
          left: 0, width: `${pct}%`, height: 4,
          background: 'rgba(255,255,255,0.9)',
          borderRadius: 2,
        }}/>
        {/* Progress knob — outer div is an enlarged transparent hit area for easier grabbing */}
        <div
          onMouseDown={onBallDown}
          style={{
            position: 'absolute',
            left: `${pct}%`, top: '50%',
            transform: 'translate(-50%, -50%)',
            width: 20, height: 20,
            display: 'flex', alignItems: 'center', justifyContent: 'center',
            cursor: dragging ? 'grabbing' : 'grab',
            zIndex: 5,
          }}
        >
          <div style={{
            width: dragging ? 14 : 12,
            height: dragging ? 14 : 12,
            background: '#fff',
            borderRadius: '50%',
            border: '0.5px solid #D2D5D8',
            boxShadow: '0 2px 6px rgba(0,0,0,0.35)',
            transition: 'width 100ms, height 100ms',
          }}/>
        </div>
        {trackHover && (
          <div style={{
            position: 'absolute',
            left: trackHover.x,
            bottom: '100%',
            transform: 'translateX(-50%)',
            marginBottom: 2,
            pointerEvents: 'none',
            zIndex: 10,
          }}>
            <TooltipBubble text={fmt(trackHover.t)} />
          </div>
        )}
      </div>

      {/* Duration — dimmed */}
      <div style={{
        fontFamily: numFont,
        fontSize: 14,
        fontWeight: 400,
        fontVariantNumeric: 'tabular-nums',
        color: 'rgba(255,255,255,0.6)',
        minWidth: 40,
        textAlign: 'center',
      }}>
        {fmt(duration)}
      </div>
    </div>
  );
}


function IconButton({ children, onClick, tooltip }) {
  const [hover, setHover] = React.useState(false);
  return (
    <button
      onClick={onClick}
      aria-label={tooltip}
      onMouseEnter={() => setHover(true)}
      onMouseLeave={() => setHover(false)}
      style={{
        position: 'relative',
        width: 24, height: 24,
        display: 'flex', alignItems: 'center', justifyContent: 'center',
        background: hover ? 'rgba(255,255,255,0.1)' : 'transparent',
        border: 'none',
        borderRadius: 6,
        color: '#fff',
        cursor: 'pointer',
        padding: 0,
        transition: 'background 120ms',
      }}
    >
      {children}
      {tooltip && (
        <div style={{
          position: 'absolute',
          bottom: '100%',
          left: '50%',
          transform: 'translateX(-50%)',
          marginBottom: 8,
          pointerEvents: 'none',
          opacity: hover ? 1 : 0,
          transition: 'opacity 120ms',
          zIndex: 10,
        }}>
          <TooltipBubble text={tooltip} />
        </div>
      )}
    </button>
  );
}

// ── Tooltip bubble ────────────────────────────────────────────────────────────
// Dark rounded bubble with a downward tail. Positioning is up to the caller.
function TooltipBubble({ text }) {
  return (
    <div style={{ position: 'relative', display: 'inline-block' }}>
      <div style={{
        background: '#1F2329',
        color: '#fff',
        fontSize: 12,
        lineHeight: '16px',
        padding: '6px 12px',
        borderRadius: 6,
        whiteSpace: 'nowrap',
        fontFamily: '"PingFang SC", -apple-system, BlinkMacSystemFont, system-ui, sans-serif',
        fontVariantNumeric: 'tabular-nums',
        boxShadow: '0 4px 8px -8px rgba(0, 0, 0, 0.06), 0 6px 12px 0 rgba(0, 0, 0, 0.04), 0 8px 24px 8px rgba(0, 0, 0, 0.04)',
      }}>
        {text}
      </div>
      <div style={{
        position: 'absolute',
        top: '100%',
        left: '50%',
        transform: 'translate(-50%, -50%) rotate(45deg)',
        width: 9, height: 9,
        borderRadius: '0 0 3px 0',
        background: '#1F2329',
      }}/>
    </div>
  );
}


Object.assign(window, {
  Easing, interpolate, animate, clamp,
  TimelineContext, useTime, useTimeline,
  Sprite, SpriteContext, useSprite,
  TextSprite, ImageSprite, RectSprite,
  Stage, PlaybackBar,
});