/* Define CSS variables for easy theming and maintenance */
:root {
    --primary-color: #007BFF; /* Blue for accents/buttons */
    --secondary-color: #0056b3; /* Darker blue for hover */
    --background-color: #f0f8ff; /* Softer light blue-ish background for a fresh, modern feel */
    --form-background: #ffffff; /* White form for contrast and modernity */
    --text-color: #333333; /* Dark text for readability */
    --accent-color: #4CAF50; /* Green accent for calls-to-action, tying into 'screen' theme */
    --shadow-light: rgba(0, 0, 0, 0.1); /* Subtle shadow for depth */
    --shadow-medium: rgba(0, 0, 0, 0.15);
    --border-radius: 8px; /* Consistent rounding */
    --transition-speed: 0.3s; /* For smooth animations */
}

/* Global box-sizing to prevent padding/margin issues causing overflow */
* {
    box-sizing: border-box;
}

body {
    display: flex;
    flex-direction: column;
    align-items: center;
    background-color: var(--background-color); /* Updated to a softer, more modern background */
    font-family: 'Lato', sans-serif;
    color: var(--text-color);
    margin: 0; /* Remove default margins for full-width feel */
    padding: 20px 0; /* Add vertical padding */
    line-height: 1.6; /* Improve readability */
    width: 100%;
    min-height: 100vh; /* Ensure full viewport height */
    overflow-x: hidden; /* Prevent horizontal scrolling on thin screens */
}

#intro {
    width: 90%; /* Wider on mobile, more responsive */
    max-width: 1200px; /* Slightly wider for modern screens */
    padding: 20px;
    background-color: white; /* White card-like section for contrast */
    border-radius: var(--border-radius);
    box-shadow: 0 4px 12px var(--shadow-light); /* Add subtle shadow for depth and modernity */
    transition: box-shadow var(--transition-speed); /* Smooth hover effect */
}

#intro:hover {
    box-shadow: 0 6px 16px var(--shadow-medium); /* Elevate on hover for interactivity */
}

#intro ul, p {
    max-width: 75%; 
    margin: 0 auto; 
    padding-left: 0; 
}



h1, h2, h3, h4 {
    font-family: 'Montserrat', sans-serif;
    text-align: center;
    margin-bottom: 1em; /* Better spacing */
    color: var(--primary-color); /* Accent color for headings */
}

h1 {
    font-size: 2.5rem; /* Larger for impact */
    margin-top: 0; /* Remove top margin */
}

h2 {
    font-size: 1.8rem;
}

p {
    text-align: center;
    font-family: 'Lato', sans-serif; /* Use body font for paragraphs */
    margin-bottom: 1.5em;
}

ul {
    list-style-type: none; /* Remove bullets for a cleaner look */
    padding: 0;
}

ul li {
    margin-bottom: 10px; /* Increased spacing */
    padding-left: 1.5em; /* Indent with pseudo-element */
    position: relative;
}

ul li::before {
    content: '✓'; /* Modern checkmark icon */
    position: absolute;
    left: 0;
    color: var(--accent-color); /* Green check for positivity */
    font-weight: bold;
}

.hero-image {
    width: 100%; /* Ensure it scales with container */
    max-width: 600px; /* Match #intro max-width for consistency */
    height: auto; /* Maintain aspect ratio */
    display: block; /* Remove any inline spacing issues */
    margin: 20px auto; /* Center and add spacing below h1 */
    border-radius: var(--border-radius); /* Optional: rounded corners for modern look */
    box-shadow: 0 4px 12px var(--shadow-light); /* Subtle shadow for depth */
    object-fit: cover; /* Ensure image fits nicely within bounds */
    transition: transform var(--transition-speed); /* Smooth hover effect */
}

.hero-image:hover {
    transform: scale(1.02); /* Slight zoom on hover for interactivity */
}

#subscribeForm {
    display: flex;
    flex-direction: column;
    gap: 15px; 
    width: 100%; 
    max-width: 450px;
    margin: 20px auto; 
    padding: 25px;
    background-color: var(--form-background);
    border-radius: var(--border-radius);
    box-shadow: 0 4px 12px var(--shadow-light); 
    transition: transform var(--transition-speed); 
}

#subscribeForm:focus-within {
    transform: translateY(-2px); /* Lift effect when interacting */
}

#subscribeForm label {
    font-weight: bold;
    font-size: 0.9rem; /* Slightly smaller for modernity */
    color: var(--text-color);
    text-align: left; /* Ensure left alignment for labels */
    width: 100%; /* Full width to prevent shifting */
}

#subscribeForm input {
    width: 100%;
    padding: 12px;
    border: 1px solid #ddd; /* Lighter border */
    border-radius: 4px;
    font-size: 1rem;
    transition: border-color var(--transition-speed); /* Smooth focus */
}

#subscribeForm input:focus {
    border-color: var(--primary-color); /* Highlight on focus */
    outline: none;
    box-shadow: 0 0 0 2px rgba(0, 123, 255, 0.25); /* Modern focus ring */
}

#subscribeForm button {
    width: 100%;
    padding: 12px;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: bold;
    transition: background-color var(--transition-speed), transform var(--transition-speed);
}

#subscribeForm button:hover {
    background-color: var(--secondary-color);
    transform: translateY(-1px); /* Subtle lift on hover */
}

#subscribeForm button:active {
    transform: translateY(0); /* Press down effect */
}

/* Style the footer for a modern, clean look */
footer {
    margin-top: auto; /* Push to bottom */
    padding: 10px 0;
    text-align: center;
    font-size: 0.8rem;
    color: #666;
    border-top: 1px solid #eee; /* Subtle divider */
    width: 100%;
}

/* Enhanced media queries for responsiveness */
@media screen and (max-width: 768px) {
    #intro {
        width: 95%; /* Fuller width on mobile */
        padding: 15px;
    }

    h1 {
        font-size: 2rem; /* Scale down headings */
    }

    #subscribeForm {
        max-width: 100%; /* Full width on mobile */
        padding: 20px 15px;
    }
}

@media screen and (max-width: 480px) {
    body {
        padding: 10px 0; /* Adjust padding for small screens */
    }

    #intro {
        padding: 10px; /* Reduce padding to fit thin screens */
    }

    #subscribeForm {
        padding: 15px 10px; /* Further reduce horizontal padding */
        gap: 10px; /* Smaller gaps for compact feel */
    }

    #subscribeForm input,
    #subscribeForm button {
        padding: 10px; /* Slightly smaller inputs */
    }
}