.calculator-area {
  position: relative;
  width: 100%;
  max-width: 510px;
  flex: 1;
  max-height: 480px;
  display: flex;
  align-items: stretch;
  min-height: 0;
  z-index: 1;
}
.calc-skin {
  flex: 1;
  background: #111;
  border: 2px solid #222;
  border-radius: 14px;
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: visible;
  transition: box-shadow 0.3s;
}
.calc-display {
  background: #080e1a;
  border-bottom: 2px solid #1a2a4a;
  padding: 14px 22px 10px;
  text-align: right;
  flex-shrink: 0;
}
.calc-display-label {
  font-size: 10px; text-transform: uppercase; letter-spacing: 2px;
  color: #3b82f6; opacity: 0.5;
}
.calc-display-num {
  font-size: 52px; font-weight: 800;
  color: #60a5fa;
  font-variant-numeric: tabular-nums;
  letter-spacing: 1px;
  display: inline-block;
  min-height: 62px;
  line-height: 62px;
  transition: color 0.3s;
}
.calc-display-num .num-frac {
  opacity: 0.6;
}
.calc-display-sub {
  font-size: 11px; color: #1e3a5f; margin-top: 2px;
}
.calc-body {
  display: flex;
  gap: 8px;
  padding: 10px;
  flex: 1;
  min-height: 0;
  overflow: hidden;
  border-radius: 0 0 12px 12px;
}
.panel-container {
  display: flex;
  align-items: stretch;
  flex: 1;
  min-height: 0;
  min-width: 0;
  position: relative;
  z-index: 1;
}
.digit-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: repeat(3, 1fr);
  gap: 8px;
  flex: 1;
  width: 100%;
  height: 100%;
  min-height: 0;
}
.grid-cell {
  display: flex; align-items: stretch; justify-content: stretch;
}
.op-column {
  display: flex; flex-direction: column; gap: 8px;
  width: 76px; flex-shrink: 0;
}