/* ==========================================================================
   TCS iON GATE Virtual Scientific Calculator Replica Styles
   ========================================================================== */

.gate-calc-container {
  max-width: 620px;
  margin: 0 auto;
  background-color: #2D3748;
  border-radius: 8px;
  border: 2px solid #4A5568;
  box-shadow: 0 15px 35px rgba(0, 0, 0, 0.4);
  padding: 14px;
  user-select: none;
  font-family: 'Segoe UI', Arial, sans-serif;
  color: #FFFFFF;
}

.calc-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: 8px;
  margin-bottom: 10px;
  border-bottom: 1px solid #4A5568;
  font-size: 0.85rem;
  font-weight: 700;
  color: #CBD5E0;
}

.calc-display-wrap {
  background-color: #E2E8F0;
  border: 2px inset #718096;
  border-radius: 4px;
  padding: 8px 12px;
  margin-bottom: 12px;
  text-align: right;
  color: #000;
}

.calc-formula-line {
  font-size: 0.8rem;
  color: #718096;
  min-height: 18px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.calc-main-display {
  font-size: 1.6rem;
  font-weight: 700;
  font-family: 'Consolas', monospace;
  overflow-x: auto;
  white-space: nowrap;
  letter-spacing: 0.05em;
}

.calc-mode-bar {
  display: flex;
  gap: 12px;
  align-items: center;
  margin-bottom: 10px;
  font-size: 0.78rem;
  color: #E2E8F0;
}

.calc-mode-bar label {
  display: flex;
  align-items: center;
  gap: 4px;
  cursor: pointer;
}

.calc-mode-bar input[type="radio"],
.calc-mode-bar input[type="checkbox"] {
  cursor: pointer;
}

.calc-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 6px;
}

.calc-btn {
  padding: 10px 4px;
  font-size: 0.85rem;
  font-weight: 600;
  border-radius: 4px;
  border: 1px solid #4A5568;
  background: linear-gradient(to bottom, #4A5568, #2D3748);
  color: #F7FAFC;
  cursor: pointer;
  text-align: center;
  transition: all 0.1s ease;
  box-shadow: 0 2px 2px rgba(0, 0, 0, 0.2);
}

.calc-btn:hover {
  background: linear-gradient(to bottom, #718096, #4A5568);
}

.calc-btn:active {
  transform: translateY(1px);
  box-shadow: none;
}

/* Number buttons */
.calc-btn.num-btn {
  background: linear-gradient(to bottom, #EDF2F7, #CBD5E0);
  color: #1A202C;
  font-weight: 700;
  font-size: 0.95rem;
}

.calc-btn.num-btn:hover {
  background: linear-gradient(to bottom, #FFFFFF, #E2E8F0);
}

/* Operator & Special buttons */
.calc-btn.op-btn {
  background: linear-gradient(to bottom, #4A5568, #2D3748);
  color: #ECC94B;
}

.calc-btn.clear-btn {
  background: linear-gradient(to bottom, #E53E3E, #9B2C2C);
  color: #FFF;
}

.calc-btn.clear-btn:hover {
  background: linear-gradient(to bottom, #FC8181, #E53E3E);
}

.calc-btn.eq-btn {
  background: linear-gradient(to bottom, #38A169, #22543D);
  color: #FFF;
  font-weight: 700;
  font-size: 1.1rem;
}

.calc-btn.eq-btn:hover {
  background: linear-gradient(to bottom, #48BB78, #38A169);
}

.calc-btn.mem-btn {
  background: linear-gradient(to bottom, #3182CE, #2B6CB0);
  color: #FFF;
  font-size: 0.78rem;
}

.calc-info-box {
  margin-top: 14px;
  padding: 10px 14px;
  background-color: #1A202C;
  border-radius: 6px;
  font-size: 0.78rem;
  color: #A0AEC0;
  line-height: 1.4;
}