/* Base styles and variables */
:root {
    --primary-color: #1a365d;
    --secondary-color: #2563eb;
    --accent-color: #34d399;
    --background-light: #f8f9fa;
    --text-color: #333;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Arial', sans-serif;
    line-height: 1.6;
    color: var(--text-color);
}

/* Navigation */
.main-nav {
    position: fixed;
    width: 100%;
    background: var(--primary-color);
    padding: 1rem 5%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 1000;
}

.main-nav .logo {
    color: white;
    text-decoration: none;
    font-size: 1.5rem;
    font-weight: bold;
}

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-links a {
    color: white;
    text-decoration: none;
    transition: color 0.3s ease;
}

.nav-links a:hover {
    color: var(--accent-color);
}

.nav-links a.active {
    border-bottom: 2px solid var(--accent-color);
    padding-bottom: 0.5rem;
}

/* Mobile Navigation */
.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    color: white;
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 4px;
    transition: all 0.3s ease;
}

.mobile-menu-toggle:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

.mobile-menu-toggle:focus {
    outline: 2px solid var(--accent-color);
    outline-offset: 2px;
}

.mobile-menu-toggle.active {
    background-color: rgba(255, 255, 255, 0.2);
}

/* Responsive Navigation */
@media (max-width: 768px) {
    .mobile-menu-toggle {
        display: block;
    }
    
    .nav-links {
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background: var(--primary-color);
        flex-direction: column;
        padding: 1rem 5%;
        gap: 1rem;
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all 0.3s ease;
        box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    }
    
    .nav-links.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .nav-links a {
        padding: 0.75rem 1rem;
        border-radius: 6px;
        display: block;
    }
    
    .nav-links a:hover {
        background-color: rgba(255, 255, 255, 0.1);
    }
    
    .nav-links a.active {
        border-bottom: none;
        background-color: rgba(52, 211, 153, 0.2);
        color: var(--accent-color);
        padding-bottom: 0.75rem;
    }
}