app.py

import streamlit as st

# Custom CSS for light/dark mode adaptation
st.markdown(
    """
    <style>
    /* Make the app container responsive */
    .stApp {
        max-width: 600px;
        margin: auto;
        padding: 20px;
        border-radius: 10px;
        transition: all 0.3s ease-in-out;
    }

    /* Light Mode Styles */
    @media (prefers-color-scheme: light) {
        .stApp {
            background-color: #ffffff;
            color: #333;
            box-shadow: 2px 2px 10px rgba(0,0,0,0.1);
        }
        .stSelectbox, .stNumberInput {
            font-size: 18px;
            color: #000;
        }
    }

    /* Dark Mode Styles */
    @media (prefers-color-scheme: dark) {
        .stApp {
            background-color: #1e1e1e;
            color: #ffffff;
            box-shadow: 2px 2px 10px rgba(255,255,255,0.1);
        }
        .stSelectbox, .stNumberInput {
            font-size: 18px;
            color: #fff;
        }
    }

    .stSuccess {
        font-size: 20px;
        font-weight: bold;
        color: #4CAF50;
    }
    </style>
    """,
    unsafe_allow_html=True
)

def main():
    st.title("📊 Advanced Calculator")
    st.write("A simple yet powerful calculator that adapts to your browser theme. Enter your numbers, select an operation, and get instant results!")

    # User input for numbers
    num1 = st.number_input("Enter first number", value=0.0)
    num2 = st.number_input("Enter second number", value=0.0)
    num3 = st.number_input("Enter third number", value=0.0)

    # Select operation (Dropdown)
    operation = st.selectbox(
        "Select an operation",
        ["Add", "Subtract", "Multiply", "Divide", "Modulus", "Exponentiation", "Average"]
    )

    # Perform calculation
    result = None
    if operation == "Add":
        result = num1 + num2 + num3
    elif operation == "Subtract":
        result = num1 - num2 - num3
    elif operation == "Multiply":
        result = num1 * num2 * num3
    elif operation == "Divide":
        if num2 != 0 and num3 != 0:
            result = num1 / num2 / num3
        else:
            result = "Cannot divide by zero"
    elif operation == "Modulus":
        if num2 != 0 and num3 != 0:
            result = num1 % num2 % num3
        else:
            result = "Cannot perform modulus with zero"
    elif operation == "Exponentiation":
        base = st.number_input("Enter the base", value=2.0)
        exponent = st.number_input("Enter the exponent", value=2.0)
        result = base ** exponent
    elif operation == "Average":
        result = (num1 + num2 + num3) / 3

    # Display result
    if result is not None:
        st.success(f"Result: {result}")

if __name__ == "__main__":
    main()