body[data-theme="balls"] {
  background:
    radial-gradient(900px 700px at 50% 0%, rgba(148, 163, 184, 0.08), transparent 70%),
    radial-gradient(700px 500px at 90% 80%, rgba(244, 195, 91, 0.06), transparent 70%),
    var(--bg);
}

.balance-stage {
  position: relative;
  display: grid;
  gap: 18px;
  padding: 24px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background:
    radial-gradient(60% 80% at 50% 0%, rgba(148, 163, 184, 0.04), transparent 70%),
    var(--bg-soft);
  box-shadow: var(--shadow-2);
  min-height: 460px;
}

.balance-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

.weighings-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border-radius: 999px;
  background: var(--surface);
  border: 1px solid var(--border);
  font-size: 0.92rem;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

.weighings-pill .lamp {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--dim);
}

.weighings-pill .lamp.used { background: var(--accent); box-shadow: 0 0 8px var(--accent); }

.balls-tray {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 8px;
  padding: 14px;
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border);
}

@media (max-width: 720px) {
  .balls-tray { grid-template-columns: repeat(6, 1fr); }
}

.ball-chip {
  position: relative;
  aspect-ratio: 1;
  border-radius: 50%;
  background: radial-gradient(circle at 32% 28%, #f1f5f9 0%, #94a3b8 60%, #475569 100%);
  border: 1px solid rgba(255, 255, 255, 0.12);
  display: grid;
  place-items: center;
  font-weight: 700;
  font-size: 0.92rem;
  color: #1e293b;
  cursor: pointer;
  user-select: none;
  transition: transform 160ms var(--ease), box-shadow 160ms var(--ease), filter 160ms;
  box-shadow: inset -2px -3px 6px rgba(0, 0, 0, 0.2), 0 4px 10px rgba(0, 0, 0, 0.3);
}

.ball-chip:hover:not(.disabled) {
  transform: translateY(-2px);
  box-shadow: inset -2px -3px 6px rgba(0, 0, 0, 0.2), 0 8px 16px rgba(244, 195, 91, 0.25);
}

.ball-chip.left {
  background: radial-gradient(circle at 32% 28%, #ddd6fe 0%, #818cf8 60%, #4338ca 100%);
  color: #f5f3ff;
}

.ball-chip.right {
  background: radial-gradient(circle at 32% 28%, #fed7aa 0%, #fb923c 60%, #c2410c 100%);
  color: #fff7ed;
}

.ball-chip.guess-target {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.ball-chip.disabled { cursor: default; opacity: 0.7; }

.balance-scale {
  position: relative;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: end;
  gap: 0;
  min-height: 280px;
  padding: 16px 0 8px;
}

.scale-pan {
  position: relative;
  min-height: 200px;
  display: grid;
  grid-template-rows: 1fr auto;
  gap: 10px;
  transition: transform 480ms var(--ease);
  transform-origin: top center;
}

.scale-pan .pan-tray {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 6px;
  padding: 10px;
  border-radius: 18px 18px 50px 50px / 12px 12px 80px 80px;
  border: 2px solid #94a3b8;
  border-top: 4px solid #cbd5e1;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.08) 0%, rgba(255, 255, 255, 0.02) 100%),
    radial-gradient(60% 60% at 50% 50%, rgba(255, 255, 255, 0.05), transparent 70%);
  min-height: 90px;
  align-content: end;
  align-items: end;
  position: relative;
  z-index: 1;
}

.scale-pan .pan-tray::before {
  content: "";
  position: absolute;
  top: -10px;
  left: 50%;
  transform: translateX(-50%);
  width: 70%;
  height: 4px;
  border-radius: 2px;
  background: linear-gradient(180deg, #cbd5e1, #64748b);
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.06);
}

.scale-pan .pan-tray .ball-chip {
  font-size: 0.7rem;
  cursor: pointer;
}

.scale-pan.left { transform-origin: right top; }
.scale-pan.right { transform-origin: left top; }

.scale-pan.down { transform: translateY(28px); }
.scale-pan.up { transform: translateY(-28px); }

.scale-rope {
  position: absolute;
  top: 0;
  left: 50%;
  width: 2px;
  height: 60px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.24) 0%, rgba(255, 255, 255, 0.06) 100%);
  transform: translateX(-50%);
}

.scale-fulcrum {
  position: relative;
  width: 80px;
  align-self: stretch;
  display: grid;
  align-items: end;
  justify-items: center;
}

.fulcrum-beam {
  position: absolute;
  top: 60px;
  left: 50%;
  width: 100%;
  height: 8px;
  background: linear-gradient(180deg, #cbd5e1 0%, #64748b 100%);
  border-radius: 4px;
  transform: translateX(-50%) rotate(var(--tilt, 0deg));
  transform-origin: center center;
  transition: transform 480ms var(--ease);
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.4);
}

.fulcrum-post {
  width: 22px;
  height: 220px;
  background: linear-gradient(180deg, #cbd5e1 0%, #475569 100%);
  border-radius: 8px 8px 4px 4px;
  box-shadow: inset -3px 0 6px rgba(0, 0, 0, 0.3), 0 4px 14px rgba(0, 0, 0, 0.45);
}

.fulcrum-base {
  position: absolute;
  bottom: -8px;
  left: 50%;
  transform: translateX(-50%);
  width: 130px;
  height: 14px;
  background: linear-gradient(180deg, #94a3b8 0%, #475569 100%);
  border-radius: 4px;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.5);
}

.balance-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}

.balance-controls .spacer { flex: 1 1 auto; }

.balance-status {
  min-height: 28px;
  color: var(--muted);
  font-size: 0.94rem;
}

.balance-status.good { color: #86efac; }
.balance-status.bad { color: #fecaca; }

.weigh-history {
  display: grid;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.weigh-history li {
  display: grid;
  grid-template-columns: 22px 1fr auto;
  gap: 10px;
  align-items: center;
  padding: 8px 10px;
  border-radius: var(--radius-sm);
  background: var(--surface);
  border: 1px solid var(--border);
  font-size: 0.88rem;
}

.weigh-history li .num {
  color: var(--accent);
  font-weight: 700;
}

.weigh-history li .side-lr {
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}

.weigh-history li .result.eq { color: var(--text); }
.weigh-history li .result.lt { color: #bfdbfe; }
.weigh-history li .result.gt { color: #fed7aa; }

.guess-panel {
  display: grid;
  gap: 10px;
  padding: 14px;
  margin-top: 10px;
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(244, 195, 91, 0.08), transparent 60%), var(--surface);
  border: 1px solid var(--border);
}

.guess-panel.hidden { display: none; }

.guess-row {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.guess-row label { color: var(--muted); font-size: 0.9rem; }

.direction-toggle {
  display: inline-flex;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface);
  overflow: hidden;
}

.direction-toggle button {
  padding: 8px 14px;
  font-weight: 600;
  background: transparent;
  color: var(--muted);
  border: 0;
  cursor: pointer;
}

.direction-toggle button.on {
  background: var(--accent);
  color: #1a1505;
}