:root {
  --accent: #ff4fc3;
  --ink: #14060f;
  /* How much longer than written every animated duration below runs. Set by
     motion.js from the speed the player is on: 1 normally, and above 1 on a
     low-res screen, where everything is slowed down together. */
  --motion-stretch: 1;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  height: 100%;
  overflow: hidden;
  background: var(--ink);
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  cursor: none;
}

/* --- background ------------------------------------------------------- */

#backgrounds {
  position: fixed;
  inset: 0;
}

/* Two canvases, cross-faded. The zoom and the crop are baked into the pixels
   by backdrop.js, so these are always exactly screen-sized. */
#backgrounds canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  transition: opacity calc(900ms * var(--motion-stretch)) ease;
  /* Knock the poster back so the video frame stays the focal point — the
     posters are pale and read far brighter on a projector than on a desk. */
  filter: brightness(0.45) saturate(1.15);
}

#backgrounds canvas.active {
  opacity: 1;
}

/* The logo sits on the poster, not on the video: it shares the backdrop's
   layer so the frame and the stills still pass in front of it. Its width comes
   from LOGO_WIDTH, written onto the element by backdrop.js. */
#logo {
  position: fixed;
  top: 50%;
  left: 50%;
  /* Centred, then nudged sideways by LOGO_OFFSET, which backdrop.js writes
     onto the element. */
  --logo-shift: 0%;
  translate: calc(-50% + var(--logo-shift)) -50%;
  height: auto;
  /* Only bites on a screen too short for the width above — on the projector
     the width is what decides. */
  max-height: 70vh;
  object-fit: contain;
  pointer-events: none;
  z-index: 0;
}

/* Built and removed by the wash animation. Sits between the poster and the
   stills, and blends rather than covers, so the poster stays legible through
   whatever colour is passing over it. The gradient itself is written per frame
   from JS. */
#wash {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  /* Takes the poster's luminance and only replaces its hue, so the wash reads
     as a colour change rather than as a sheet of colour laid over the top. */
  mix-blend-mode: color;
}

/* --- frozen screenshots ------------------------------------------------ */

#stills {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 1;
}

#stills img {
  position: absolute;
  top: 0;
  left: 0;
  object-fit: cover;
  opacity: 0;
  /* Matches #frameSkin, so a still reads as a frozen copy of the frame. */
  border-radius: 10px;
  border: 2px solid rgba(255, 255, 255, 0.85);
  box-shadow:
    0 0 0 4px rgba(255, 79, 195, 0.55),
    0 24px 70px rgba(0, 0, 0, 0.7);
  transition: opacity calc(500ms * var(--motion-stretch)) ease;
  will-change: transform;
}

#stills img.visible {
  opacity: 1;
}

/* The trail ramps opacity frame-by-frame as a still ages, so the CSS transition
   above would only fight it. */
#stills img.trail {
  transition: none;
}

/* --- the moving frame -------------------------------------------------- */

#frameMover {
  position: fixed;
  top: 0;
  left: 0;
  /* Above the stills, so the live video always wins if anything ever overlaps. */
  z-index: 2;
  will-change: transform;
}

#frameSkin {
  position: relative;
  width: 100%;
  height: 100%;
  overflow: hidden;
  border-radius: 10px;
  border: 2px solid rgba(255, 255, 255, 0.85);
  box-shadow:
    0 0 0 4px rgba(255, 79, 195, 0.55),
    0 24px 70px rgba(0, 0, 0, 0.7);
  background: #000;
}

/* Lift the frame while the drag animation is holding it, the way a dragged
   window separates from the desktop. */
#frameMover.dragging #frameSkin {
  box-shadow:
    0 0 0 4px rgba(255, 79, 195, 0.75),
    0 40px 100px rgba(0, 0, 0, 0.85);
}

/* The wash animation hands the frame the colour currently passing behind it. */
#frameMover.washing #frameSkin {
  box-shadow:
    0 0 0 4px var(--wash, rgba(255, 79, 195, 0.55)),
    0 24px 70px rgba(0, 0, 0, 0.7);
}

/* --- the drawn pointer -------------------------------------------------- */

/* Built and removed by the drag animation; nothing else on the page has one. */
#pointer {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 3;
  pointer-events: none;
  will-change: transform;
  filter: drop-shadow(0 2px 6px rgba(0, 0, 0, 0.6));
}

#pointer svg {
  display: block;
  transition: transform 90ms ease;
}

/* The click itself: the arrow dips, so a grab is visible even mid-pause. */
#pointer.down svg {
  transform: scale(0.82);
}

/* --- pong --------------------------------------------------------------- */

/* Built and removed by the pong animation. Above the frame, so the ball is
   never hidden behind the paddle it is bouncing off. */
#pong {
  position: fixed;
  inset: 0;
  z-index: 3;
  pointer-events: none;
}

#pongBall {
  position: absolute;
  top: 0;
  left: 0;
  background: #fff;
  /* Square, and no smoothing: the original had no room for a round ball. */
  box-shadow: 0 0 18px rgba(255, 79, 195, 0.7);
  will-change: transform;
}

/* Out of play between a goal and the next serve. */
#pongBall.out {
  opacity: 0;
}

#pongScore {
  position: absolute;
  top: clamp(16px, 4vh, 56px);
  right: clamp(16px, 4vw, 72px);
  display: flex;
  gap: 0.35em;
  font-size: clamp(2.5rem, 7vh, 6rem);
}

#pongScore .digit {
  display: block;
  height: 1em;
  /* The viewBox is 24 wide by 44 tall. */
  width: calc(1em * 24 / 44);
}

/* An unlit segment stays visible, just barely — that faint ghost of the whole
   figure eight is what makes the display read as a seven-segment one. */
#pongScore .segment {
  fill: rgba(255, 255, 255, 0.07);
}

#pongScore .segment.lit {
  fill: #fff;
  filter: drop-shadow(0 0 10px rgba(255, 79, 195, 0.8));
}

/* The paddle: a hard-edged slab, so the ball has something square to hit. */
#frameMover.paddle #frameSkin {
  border-radius: 0;
  box-shadow:
    0 0 0 3px #fff,
    0 0 34px rgba(255, 79, 195, 0.6);
}

.deck {
  position: absolute;
  inset: 0;
  opacity: 0;
  /* Opacity is driven frame-by-frame during a crossfade, so no CSS transition
     here — it would fight the JS ramp. */
}

.deck iframe {
  width: 100%;
  height: 100%;
  border: 0;
  /* The iframe would otherwise swallow nothing useful, but keeping it inert
     avoids stray clicks pausing playback. */
  pointer-events: none;
}

/* The screen-capture stream's sink. Has to be in the document to keep getting
   frames (see capture.js), but must not be visible or catch clicks. */
#captureSink {
  position: fixed;
  left: 0;
  top: 0;
  width: 1px;
  height: 1px;
  opacity: 0.01;
  pointer-events: none;
  z-index: -1;
}

#probe {
  position: fixed;
  left: -400px;
  top: -400px;
  width: 320px;
  height: 180px;
  opacity: 0;
  pointer-events: none;
}

/* --- start gate -------------------------------------------------------- */

#gate {
  position: fixed;
  inset: 0;
  display: grid;
  place-items: center;
  background: rgba(20, 6, 15, 0.92);
  backdrop-filter: blur(6px);
  z-index: 10;
  cursor: pointer;
  transition: opacity 400ms ease;
}

#gate.hidden {
  opacity: 0;
  pointer-events: none;
}

.gate-inner {
  text-align: center;
  color: #fff;
}

.gate-inner h1 {
  font-size: clamp(2rem, 7vw, 5rem);
  margin: 0 0 0.3em;
  letter-spacing: -0.03em;
  color: var(--accent);
}

.gate-inner p {
  margin: 0 0 2em;
  opacity: 0.7;
  font-size: 1.05rem;
}

#start {
  font: inherit;
  font-size: 1.3rem;
  padding: 0.7em 3em;
  border: 0;
  border-radius: 999px;
  background: var(--accent);
  color: var(--ink);
  font-weight: 700;
  cursor: pointer;
}

#start:disabled {
  opacity: 0.35;
  cursor: default;
}

#status {
  position: fixed;
  bottom: 12px;
  right: 16px;
  z-index: 20;
  color: var(--accent);
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

/* Bottom left, opposite #status, so the two never overlap. */
#notice {
  position: fixed;
  bottom: 12px;
  left: 16px;
  z-index: 20;
  max-width: min(46ch, 60vw);
  padding: 8px 12px;
  border-radius: 6px;
  background: rgb(0 0 0 / 0.55);
  color: var(--accent);
  font-size: 0.8rem;
  line-height: 1.35;
}