body {
    font-family: 'Inter', sans-serif;
    margin: 0;
}

/* Calculator Display */
.calculator-display {
    min-height: 6rem;
    display: flex;
    align-items: center;
    justify-content: flex-end;
    padding: 1rem;
    font-size: 3rem;
}

/* Base Button Styling */
.btn {
    padding: 0.75rem;
    border-radius: 0.5rem;
    font-size: 1.5rem;
    font-weight: 500;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    transition-property: all;
    transition-duration: 150ms;
    transform: scale(1);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn:hover {
    transform: scale(1.02);
}

.btn:active {
    transform: scale(0.98);
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.15);
}

/* Number Buttons */
.btn-number {
    background-color: #e2e8f0;
    color: #2d3748;
}
.btn-number:hover {
    background-color: #cbd5e0;
}

/* Secondary Buttons */
.btn-secondary {
    background-color: #a0aec0;
    color: #ffffff;
}
.btn-secondary:hover {
    background-color: #718096;
}

/* Operator Buttons */
.btn-operator {
    background-color: #4c51bf;
    color: #ffffff;
}
.btn-operator:hover {
    background-color: #3b439c;
}

/* Equals Button */
.btn-equals {
    background-color: #38a169;
    color: #ffffff;
}
.btn-equals:hover {
    background-color: #2f855a;
}

/* Dark Mode Overrides */
html.dark body {
    background-color: #1a202c;
    color: #e2e8f0;
}

html.dark header {
    background-color: #2d3748;
    color: #e2e8f0;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
}

html.dark main > div {
    background-color: #2d3748;
    color: #e2e8f0;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
}

html.dark .calculator-display {
    background-color: #4a5568;
    color: #e2e8f0;
}

html.dark .btn-number {
    background-color: #4a5568;
    color: #e2e8f0;
}
html.dark .btn-number:hover {
    background-color: #64748b;
}

html.dark .btn-secondary {
    background-color: #64748b;
    color: #e2e8f0;
}
html.dark .btn-secondary:hover {
    background-color: #4a5568;
}

html.dark .btn-operator {
    background-color: #6b46c1;
    color: #ffffff;
}
html.dark .btn-operator:hover {
    background-color: #805ad5;
}

html.dark .btn-equals {
    background-color: #48bb78;
    color: #ffffff;
}
html.dark .btn-equals:hover {
    background-color: #68d391;
}

/* Footer Styles */
.footer {
    text-align: center;
    padding: 1.5rem;
    margin-top: auto;
    border-top-left-radius: 0.5rem;
    border-top-right-radius: 0.5rem;
}

.footer p {
    margin-bottom: 1rem;
}

.footer .socials {
    display: flex;
    gap: 1rem;
    justify-content: center;
}

@media (min-width: 768px) {
    .footer p {
        margin-bottom: 0;
    }
    .footer .socials {
        justify-content: flex-end;
    }
}

html.dark .footer {
    background-color: #1a202c;
    color: #cbd5e0;
}

html.dark .footer .socials a:hover {
    color: #9f7aea;
}