/* Calculator Page Styles */
.calculator-page {
    padding: 8rem 1rem 4rem;
    min-height: calc(100vh - 60px);
    display: flex;
    justify-content: center;
    align-items: flex-start;
    background: linear-gradient(to bottom, var(--bg-color), var(--card-bg));
}

/* Calculator Container */
.calculator {
    background-color: var(--card-bg);
    border-radius: 1rem;
    box-shadow: 0 10px 20px var(--shadow-color);
    padding: 1.5rem;
    width: 100%;
    max-width: 400px;
    margin: 0 auto;
}

/* Calculator Display */
.calculator-display {
    margin-bottom: 1.5rem;
}

.calculator-display input {
    width: 100%;
    padding: 1rem;
    font-size: 2rem;
    text-align: right;
    background-color: var(--bg-color);
    color: var(--text-color);
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    outline: none;
}

/* Calculator Keys Grid */
.calculator-keys {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0.75rem;
}

/* Button Styles */
.calculator-keys button {
    padding: 1.25rem;
    font-size: 1.25rem;
    border: none;
    border-radius: 0.5rem;
    background-color: var(--bg-color);
    color: var(--text-color);
    cursor: pointer;
    transition: all 0.2s ease;
    user-select: none;
}

.calculator-keys button:hover {
    background-color: var(--primary-color);
    color: white;
}

.calculator-keys button:active {
    transform: scale(0.95);
}

/* Specific Button Styles */
.key-operator {
    background-color: var(--card-bg) !important;
    color: var(--primary-color) !important;
    font-weight: bold;
}

.key-operator:hover {
    background-color: var(--primary-color) !important;
    color: white !important;
}

.key-equals {
    background-color: var(--primary-color) !important;
    color: white !important;
}

.key-equals:hover {
    background-color: var(--secondary-color) !important;
}

.key-clear, .key-backspace {
    background-color: #ef4444 !important;
    color: white !important;
}

.key-clear:hover, .key-backspace:hover {
    background-color: #dc2626 !important;
}

.zero {
    grid-column: span 2;
}

/* Responsive Design */
@media (max-width: 480px) {
    .calculator {
        padding: 1rem;
    }

    .calculator-display input {
        font-size: 1.75rem;
        padding: 0.75rem;
    }

    .calculator-keys button {
        padding: 1rem;
        font-size: 1.1rem;
    }
}

/* Focus States for Accessibility */
.calculator-keys button:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

.calculator-display input:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px var(--primary-color);
}

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

.calculator-keys button:active {
    animation: buttonPress 0.1s ease-in-out;
}