app.py

# app.py
import streamlit as st
import math

# Page Configuration
st.set_page_config(
    page_title="🔧 Pipe Sizing Helper",
    page_icon="💧",
    layout="centered"
)

# Custom CSS for Styling
st.markdown("""
    <style>
        .title {
            text-align: center;
            font-size: 2.5em;
            font-weight: bold;
            color: #4CAF50;
        }
        .subtitle {
            text-align: center;
            font-size: 1.2em;
            color: #555;
        }
        .result {
            text-align: center;
            font-size: 1.3em;
            font-weight: bold;
            color: #2196F3;
        }
        .footer {
            text-align: center;
            margin-top: 50px;
            font-size: 0.9em;
            color: #777;
        }
    </style>
""", unsafe_allow_html=True)

# Header
st.markdown("<h1 class='title'>🔧 Pipe Sizing Helper</h1>", unsafe_allow_html=True)
st.markdown("<p class='subtitle'>Calculate optimal pipe size based on flow rate and velocity</p>", unsafe_allow_html=True)

# User Inputs
st.subheader("💡 Input Parameters")

flow_rate = st.number_input("🌊 Enter Flow Rate (m³/s):", min_value=0.0, format="%.4f")
velocity = st.number_input("💨 Enter Permissible Velocity (m/s):", min_value=0.1, format="%.2f")

# Calculate Pipe Diameter
if st.button("🔄 Calculate Pipe Diameter"):
    if velocity > 0 and flow_rate > 0:
        # Formula: Diameter = sqrt((4 * Flow Rate) / (π * Velocity))
        diameter = math.sqrt((4 * flow_rate) / (math.pi * velocity))
        st.markdown(f"<p class='result'>✅ Recommended Pipe Diameter: {diameter:.2f} meters</p>", unsafe_allow_html=True)
    else:
        st.warning("⚠️ Please enter valid positive values for flow rate and velocity.")

# Footer
st.markdown("<p class='footer'>💻 <b>Developed by ChatGPT</b></p>", unsafe_allow_html=True)