* {
  box-sizing: border-box;
}

html,
body {
  width: 100%;
  height: 100%;
  margin: 0;
  overflow: hidden;
  background: #05070d;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: #f8fafc;
  touch-action: manipulation;
}

canvas {
  display: block;
  width: 100vw;
  height: 100vh;
  cursor: crosshair;
}

button {
  font: inherit;
}

.hud,
.toolbar {
  position: fixed;
  z-index: 5;
  display: flex;
  gap: 8px;
  user-select: none;
}

.hud {
  top: 14px;
  left: 14px;
  flex-wrap: wrap;
}

.hud__item {
  min-width: 78px;
  padding: 8px 10px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 8px;
  background: rgba(7, 12, 22, 0.72);
  backdrop-filter: blur(10px);
}

.hud__item span {
  display: block;
  color: #94a3b8;
  font-size: 11px;
  line-height: 1;
  text-transform: uppercase;
}

.hud__item strong {
  display: block;
  margin-top: 4px;
  font-size: 20px;
  line-height: 1;
}

.toolbar {
  top: 14px;
  right: 14px;
}

.toolbar__button,
.overlay__button {
  border: 0;
  border-radius: 8px;
  color: #04111f;
  background: #38bdf8;
  font-weight: 800;
  cursor: pointer;
}

.toolbar__button {
  min-width: 84px;
  min-height: 38px;
  padding: 8px 12px;
}

.toolbar__button:nth-child(2) {
  background: #fbbf24;
}

.toolbar__button:disabled {
  cursor: not-allowed;
  opacity: 0.45;
}

.overlay {
  position: fixed;
  inset: 0;
  z-index: 10;
  display: grid;
  place-items: center;
  padding: 20px;
  background: rgba(3, 7, 18, 0.74);
  backdrop-filter: blur(8px);
  opacity: 1;
  visibility: visible;
}

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

.overlay__panel {
  width: min(92vw, 430px);
  padding: 26px;
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 8px;
  background: rgba(15, 23, 42, 0.94);
  text-align: center;
  box-shadow: 0 22px 60px rgba(0, 0, 0, 0.35);
}

.overlay__eyebrow {
  margin: 0 0 10px;
  color: #7dd3fc;
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

.overlay h1 {
  margin: 0;
  font-size: clamp(34px, 9vw, 54px);
  line-height: 0.95;
}

.overlay__score {
  margin: 14px 0 22px;
  color: #cbd5e1;
  font-size: 18px;
  font-weight: 700;
}

.overlay__instructions {
  display: none;
  margin: -4px 0 22px;
  color: #cbd5e1;
  font-size: 14px;
  line-height: 1.45;
}

.overlay__instructions.is-visible {
  display: block;
}

.overlay__instructions p {
  margin: 0 0 14px;
}

.stage-list {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 6px;
}

.stage-list span {
  min-height: 44px;
  padding: 8px 6px;
  border: 1px solid rgba(125, 211, 252, 0.22);
  border-radius: 8px;
  background: rgba(8, 47, 73, 0.46);
  color: #e0f2fe;
  font-size: 12px;
  font-weight: 800;
  line-height: 1.15;
}

.overlay__button {
  width: 100%;
  min-height: 46px;
  padding: 12px 16px;
  font-size: 17px;
}

@media (max-width: 620px) {
  .hud {
    right: 14px;
  }

  .hud__item {
    flex: 1 1 30%;
    min-width: 0;
  }

  .toolbar {
    top: auto;
    right: 14px;
    bottom: 14px;
    left: 14px;
  }

  .toolbar__button {
    flex: 1;
  }

  .stage-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}