:root {
  --led: #ffffff;
  --glow: rgba(255, 255, 255, 0.85);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html,
body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: #000;
  color: #fff;
  font-family: "Helvetica Neue", Arial, "Segoe UI", system-ui, sans-serif;
  -webkit-user-select: none;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
  touch-action: none; /* let multitouch drive the mallets, not scroll/zoom */
  overscroll-behavior: none;
}

#stage {
  position: fixed;
  inset: 0;
  overflow: hidden;
}

/* Webcam fills the screen, mirrored like a mirror. */
#cam {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transform: scaleX(-1);
  filter: brightness(0.92) saturate(1.05);
  background: #050505;
  z-index: 0;
  transition: filter 0.3s ease, opacity 0.3s ease;
}

/* Background modes (cycled by the BG button / "B" key). */
body.bg-blur #cam {
  /* scale a touch to hide the soft edges the blur creates */
  transform: scaleX(-1) scale(1.08);
  filter: blur(24px) brightness(0.6) saturate(1.05);
}

body.bg-black #cam {
  opacity: 0; /* the black page shows through */
}

/* Game vector layer (rink lines, mallets, puck). */
#game {
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
}

/* LED scoreboard, top-center. */
#scoreboard {
  position: absolute;
  top: 16px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
  pointer-events: none;
}

/* Center message (GOAL / countdown / winner). */
#message {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 3;
  font-weight: 800;
  font-size: clamp(48px, 12vw, 160px);
  letter-spacing: 0.06em;
  color: #fff;
  text-shadow: 0 0 12px var(--glow), 0 0 34px rgba(255, 255, 255, 0.55);
  pointer-events: none;
  white-space: nowrap;
  text-align: center;
}

#message.small {
  font-size: clamp(28px, 5vw, 64px);
  letter-spacing: 0.12em;
}

.hidden {
  display: none !important;
}

/* Start / status overlay. */
.overlay {
  position: absolute;
  inset: 0;
  z-index: 5;
  display: flex;
  align-items: center;
  justify-content: center;
  background: radial-gradient(
    ellipse at center,
    rgba(0, 0, 0, 0.55),
    rgba(0, 0, 0, 0.9)
  );
  backdrop-filter: blur(6px);
}

.panel {
  text-align: center;
  padding: 40px;
  max-width: 90vw;
}

.panel h1 {
  font-size: clamp(40px, 9vw, 92px);
  font-weight: 800;
  letter-spacing: 0.12em;
  line-height: 0.95;
  text-shadow: 0 0 18px var(--glow), 0 0 44px rgba(255, 255, 255, 0.4);
}

.panel h1 span {
  display: block;
  font-weight: 300;
  letter-spacing: 0.42em;
  font-size: 0.42em;
  margin-top: 0.5em;
  padding-left: 0.42em;
  opacity: 0.85;
}

.tagline {
  margin-top: 22px;
  font-size: clamp(14px, 2.2vw, 20px);
  font-weight: 300;
  letter-spacing: 0.04em;
  opacity: 0.8;
}

#startBtn {
  margin-top: 34px;
  padding: 16px 54px;
  font-size: clamp(18px, 2.6vw, 26px);
  font-weight: 700;
  letter-spacing: 0.24em;
  color: #fff;
  background: transparent;
  border: 2px solid rgba(255, 255, 255, 0.85);
  border-radius: 999px;
  cursor: pointer;
  transition: all 0.18s ease;
  text-shadow: 0 0 10px var(--glow);
  box-shadow: 0 0 18px rgba(255, 255, 255, 0.18),
    inset 0 0 18px rgba(255, 255, 255, 0.08);
}

#startBtn:hover {
  background: rgba(255, 255, 255, 0.12);
  box-shadow: 0 0 30px rgba(255, 255, 255, 0.4),
    inset 0 0 22px rgba(255, 255, 255, 0.12);
}

#startBtn:active {
  transform: scale(0.97);
}

.hint {
  margin-top: 26px;
  font-size: clamp(11px, 1.6vw, 14px);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  opacity: 0.55;
}

.status {
  margin-top: 16px;
  min-height: 1.2em;
  font-size: 14px;
  letter-spacing: 0.06em;
  opacity: 0.9;
  color: #ffd9d0;
}

/* Corner control button (background toggle). Sits below the start overlay
   (z-index 5) so it's hidden on the menu and appears once play begins. */
.ctrl-btn {
  position: absolute;
  top: 14px;
  left: 14px;
  z-index: 4;
  padding: 9px 16px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.85);
  background: rgba(0, 0, 0, 0.4);
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: 999px;
  cursor: pointer;
  pointer-events: auto;
  backdrop-filter: blur(4px);
  transition: all 0.15s ease;
}

.ctrl-btn:hover {
  color: #fff;
  border-color: rgba(255, 255, 255, 0.7);
  box-shadow: 0 0 14px rgba(255, 255, 255, 0.2);
}

.ctrl-btn:active {
  transform: scale(0.96);
}

/* Small persistent notice (e.g. mouse mode / controls). */
#notice {
  position: absolute;
  left: 50%;
  bottom: 14px;
  transform: translateX(-50%);
  z-index: 3;
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.55);
  text-shadow: 0 0 8px rgba(0, 0, 0, 0.8);
  pointer-events: none;
  text-align: center;
  white-space: nowrap;
}