.calc-wrapper {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: 4rem 0;
  gap: 1.5rem;
}

.calculator {
  width: 100%;
  max-width: 400px;
  /* Override default glass card padding for the calculator layout */
  padding: 1.5rem;
  border-radius: 30px;
}

/* Calculator Screen */
.calc-screen {
  background: rgba(0, 0, 0, 0.2);
  border-radius: 20px;
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  justify-content: space-around;
  word-wrap: break-word;
  word-break: break-all;
  box-shadow: inset 0 2px 10px rgba(0,0,0,0.3);
  border: 1px solid var(--glass-border);
}

.previous-operand {
  color: var(--text-muted);
  font-size: 1.1rem;
  min-height: 1.5rem;
}

.current-operand {
  color: var(--text-main);
  font-size: 2.5rem;
  font-weight: 700;
}

/* Calculator Buttons Grid */
.calc-keys {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
}

.calc-btn {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 16px;
  color: var(--text-main);
  font-size: 1.5rem;
  font-family: var(--font-primary);
  font-weight: 500;
  padding: 1rem;
  cursor: pointer;
  transition: all var(--transition-fast);
  /* Centers text inside the button */
  display: flex;
  justify-content: center;
  align-items: center;
}

.calc-btn:hover {
  background: rgba(255, 255, 255, 0.1);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0,0,0,0.2);
}

.calc-btn:active {
  transform: translateY(1px);
}

.span-two {
  grid-column: span 2;
}

.operator {
  color: var(--accent-secondary);
  background: rgba(6, 182, 212, 0.1);
}

.operator:hover {
  background: rgba(6, 182, 212, 0.2);
}

.clear {
  color: #ff6b6b;
  background: rgba(255, 107, 107, 0.1);
}

.clear:hover {
  background: rgba(255, 107, 107, 0.2);
}

.equals {
  /* Using the .btn-primary styles from components.css, just adjusting for grid */
  border-radius: 16px;
}

/* Hover Hint Bar */
.hint-bar {
  width: 100%;
  max-width: 600px;
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--glass-border);
  border-radius: 16px;
  padding: 1rem 1.5rem;
  color: var(--text-muted);
  font-size: 0.95rem;
  text-align: center;
  transition: all var(--transition-fast);
  opacity: 0.7;
}

.hint-bar.active {
  background: rgba(139, 92, 246, 0.15); /* Primary accent */
  border-color: rgba(139, 92, 246, 0.4);
  color: var(--text-main);
  opacity: 1;
  box-shadow: 0 4px 15px rgba(139, 92, 246, 0.2);
}

/* Additions for calculator.css */



/* Scientific Mode Specific Layout */
.scientific-mode {
    max-width: 600px; /* Wider for extra buttons */
}

.scientific-keys {
    grid-template-columns: repeat(6, 1fr);
}

.sci-operator {
    background: rgba(139, 92, 246, 0.1);
    color: var(--accent-primary);
    font-size: 1.2rem;
}

.sci-operator:hover {
    background: rgba(139, 92, 246, 0.2);
}

.sci-operator.disabled {
    visibility: hidden;
}

/* Typing Animation & Overdrive Flash */
@keyframes pop-in {
  0% { 
      transform: scale(0.7); 
      color: #ffffff;
      text-shadow: 0 0 20px rgba(255, 255, 255, 0.8), 0 0 40px var(--accent-primary);
  }
  100% { 
      transform: scale(1); 
      color: var(--text-main);
      text-shadow: none;
  }
}

.animate-pop {
  animation: pop-in 0.2s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

/* Error Shake */
@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20%, 60% { transform: translateX(-6px); }
  40%, 80% { transform: translateX(6px); }
}

.error-shake {
  animation: shake 0.3s cubic-bezier(.36,.07,.19,.97) both;
  border-color: #ff4757 !important;
  box-shadow: 0 0 20px rgba(255, 71, 87, 0.4) !important;
}