:root {
    --primary-color: #6a1b9a; /* Purple */
    --secondary-color: #2196f3; /* Blue */
    --background-color-light: #ffffff;
    --background-color-dark: #121212;
    --text-color-light: #000000;
    --text-color-dark: #ffffff;
    --link-color: var(--secondary-color);
    --transition-speed: 0.3s;
}

body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    color: var(--text-color-light);
    background-color: var(--background-color-light);
    transition: background-color var(--transition-speed), color var(--transition-speed);
}

/* Light/Dark Mode Styles */
body.dark-mode {
    background-color: var(--background-color-dark);
    color: var(--text-color-dark);
}

/* Responsive Design */
@media screen and (max-width: 768px) {
    nav {
        flex-direction: column;
    }
    .hero {
        padding: 50px 20px;
    }
}

@media screen and (min-width: 769px) and (max-width: 1024px) {
    nav {
        justify-content: space-between;
    }
}

/* Navigation Styles */
nav {
    display: flex;
    justify-content: space-around;
    background-color: var(--primary-color);
}

nav a {
    color: var(--text-color-light);
    padding: 15px;
    text-decoration: none;
}

/* Hero Section Styles */
.hero {
    background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
    padding: 100px 20px;
    text-align: center;
    color: var(--text-color-dark);
}

/* Trail Selector Cards */
.card {
    background: white;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    margin: 20px;
    transition: transform var(--transition-speed);
}

.card:hover {
    transform: scale(1.05);
}

/* Flowchart Visualization Styles */
.flowchart {
    display: flex;
    justify-content: space-around;
    flex-wrap: wrap;
}

/* Quick Links Grid */
.quick-links {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 20px;
    padding: 20px;
}

/* Capabilities Grid */
.capabilities {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 20px;
}

/* Footer Styles */
footer {
    background-color: var(--primary-color);
    color: var(--text-color-light);
    text-align: center;
    padding: 20px;
}

/* Animations and Transitions */
a {
    transition: color var(--transition-speed);
}

a:hover {
    color: var(--primary-color);
}