/* Standard Calculator Styles */
.calculator-container {
    max-width: 350px;
    margin: 0 auto;
    background: var(--background-alt);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 20px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.calculator-display {
    position: relative;
    margin-bottom: 20px;
}

.memory-indicator {
    position: absolute;
    top: 8px;
    left: 8px;
    font-size: 12px;
    font-weight: bold;
    color: var(--primary-color);
    background: rgba(0, 123, 255, 0.1);
    padding: 2px 6px;
    border-radius: 4px;
}

.display-screen {
    width: 100%;
    height: 60px;
    font-size: 24px;
    font-weight: bold;
    text-align: right;
    padding: 15px;
    background: var(--background);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-color);
    outline: none;
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.1);
}

.calculator-buttons {
    display: grid;
    grid-template-columns: 1fr;
    gap: 8px;
}

.button-row {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 8px;
}

.btn-calc {
    height: 50px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    outline: none;
    user-select: none;
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-calc:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.15);
}

.btn-calc:active {
    transform: translateY(0);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

/* Number buttons */
.btn-calc.number {
    background: var(--background-alt);
    color: var(--text-color);
    border-color: var(--border-color);
}

.btn-calc.number:hover {
    background: var(--background);
    border-color: var(--primary-color);
}

/* Operation buttons */
.btn-calc.operation {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.btn-calc.operation:hover {
    background: #0056b3;
    border-color: #0056b3;
}

/* Equals button */
.btn-calc.equals {
    background: #28a745;
    color: white;
    border-color: #28a745;
    grid-column: span 2;
}

.btn-calc.equals:hover {
    background: #218838;
    border-color: #218838;
}

/* Clear buttons */
.btn-calc.clear {
    background: #dc3545;
    color: white;
    border-color: #dc3545;
}

.btn-calc.clear:hover {
    background: #c82333;
    border-color: #c82333;
}

/* Memory buttons */
.btn-calc.memory {
    background: #6f42c1;
    color: white;
    border-color: #6f42c1;
    font-size: 14px;
}

.btn-calc.memory:hover {
    background: #5a32a3;
    border-color: #5a32a3;
}

/* Active state for operations */
.btn-calc.operation.active {
    background: #0056b3;
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.3);
}

/* Zero button spans two columns */
.button-row:last-child .btn-calc.number:first-child {
    grid-column: span 2;
}

/* Keyboard shortcuts display */
.keyboard-shortcuts {
    background: var(--background-alt);
    padding: 20px;
    border-radius: 8px;
    margin-top: 20px;
}

.keyboard-shortcuts h3 {
    margin-top: 0;
    color: var(--primary-color);
}

.keyboard-shortcuts ul {
    margin: 0;
    padding-left: 20px;
}

.keyboard-shortcuts li {
    margin-bottom: 8px;
    line-height: 1.5;
}

/* Responsive design */
@media (max-width: 480px) {
    .calculator-container {
        max-width: none;
        margin: 0 -10px;
        border-radius: 0;
    }
    
    .btn-calc {
        height: 45px;
        font-size: 14px;
    }
    
    .display-screen {
        height: 55px;
        font-size: 20px;
    }
}

/* Dark mode specific adjustments */
[data-theme="dark"] .calculator-container {
    background: var(--background);
    border-color: var(--border-color);
}

[data-theme="dark"] .display-screen {
    background: var(--background-alt);
    color: var(--text-color);
}

[data-theme="dark"] .memory-indicator {
    background: rgba(0, 123, 255, 0.2);
}

/* Accessibility enhancements */
.btn-calc:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* Animation for button press */
@keyframes buttonPress {
    0% { transform: scale(1); }
    50% { transform: scale(0.95); }
    100% { transform: scale(1); }
}

.btn-calc.pressed {
    animation: buttonPress 0.1s ease-in-out;
}

/* Error state */
.display-screen.error {
    color: #dc3545;
    border-color: #dc3545;
}

/* Scientific notation display */
.display-screen.scientific {
    font-size: 18px;
}