:root {
  color-scheme: dark;
  --bg: #101a2b;
  --accent: #5ee6ff;
  --accent-2: #e63946;
  --text: #f4f1ea;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  overflow: hidden;
  touch-action: none;
  -webkit-user-select: none;
  user-select: none;
}

#stage {
  position: relative;
  margin: 0 auto;
  width: 340px;
  height: 600px;
  overflow: hidden;
  border-radius: 12px;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5);
}

canvas#game {
  display: block;
  width: 100%;
  height: 100%;
  touch-action: none;
}

.hud-score {
  position: absolute;
  top: max(10px, env(safe-area-inset-top));
  left: 50%;
  transform: translateX(-50%);
  font-size: 22px;
  font-weight: 700;
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.6);
  pointer-events: none;
}

.corner-btn {
  position: absolute;
  top: max(8px, env(safe-area-inset-top));
  right: max(8px, env(safe-area-inset-right));
  z-index: 5;
}

.icon-btn {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: none;
  background: rgba(255, 255, 255, 0.12);
  color: var(--text);
  font-size: 18px;
  line-height: 1;
  cursor: pointer;
}

.icon-btn:active { background: rgba(255, 255, 255, 0.22); }

.screen {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  background: rgba(16, 26, 43, 0.78);
  backdrop-filter: blur(2px);
  text-align: center;
  padding: 20px;
}

[hidden] {
  display: none !important;
}

.title {
  font-size: 26px;
  font-weight: 800;
  letter-spacing: 0.5px;
}

.title.small { font-size: 20px; }

.btn-primary {
  width: 76px;
  height: 76px;
  border-radius: 50%;
  border: none;
  background: var(--accent);
  color: #0a2733;
  font-size: 30px;
  cursor: pointer;
  box-shadow: 0 6px 18px rgba(94, 230, 255, 0.35);
}

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

.btn-secondary {
  border: 1px solid rgba(255, 255, 255, 0.25);
  background: rgba(255, 255, 255, 0.08);
  color: var(--text);
  border-radius: 20px;
  padding: 8px 16px;
  font-size: 13px;
  cursor: pointer;
}

.btn-secondary:active { background: rgba(255, 255, 255, 0.18); }

.hint {
  font-size: 13px;
  line-height: 1.5;
  opacity: 0.75;
  max-width: 280px;
}

.best-score, .go-best {
  font-size: 13px;
  opacity: 0.8;
}

.go-score {
  font-size: 40px;
  font-weight: 800;
  color: var(--accent);
}

.row {
  display: flex;
  gap: 14px;
}

.sound-corner {
  position: absolute;
  top: max(8px, env(safe-area-inset-top));
  right: max(8px, env(safe-area-inset-right));
}

.skin-picker {
  display: flex;
  gap: 8px;
}

.skin-btn {
  border: 2px solid rgba(255, 255, 255, 0.15);
  background: rgba(255, 255, 255, 0.06);
  border-radius: 12px;
  padding: 4px 4px 2px;
  cursor: pointer;
  line-height: 0;
}

.skin-btn.active {
  border-color: var(--accent);
  background: rgba(94, 230, 255, 0.16);
}

.skin-btn canvas { display: block; }

.skin-btn span {
  display: block;
  font-size: 9px;
  line-height: 12px;
  color: var(--text);
  opacity: 0.75;
}

.mode-switch {
  display: flex;
  gap: 8px;
}

.btn-mode {
  border: 2px solid rgba(255, 255, 255, 0.15);
  background: rgba(255, 255, 255, 0.06);
  color: var(--text);
  border-radius: 18px;
  padding: 7px 14px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
}

.btn-mode.active {
  border-color: var(--accent);
  background: rgba(94, 230, 255, 0.16);
}

.go-floor {
  font-size: 15px;
  font-weight: 600;
  opacity: 0.85;
  margin-top: -10px;
}