:root {
    --primary-color: #4F46E5;
    --primary-hover: #4338CA;
    --secondary-color: #6B7280;
    --background-color: #F9FAFB;
    --text-color: #1F2937;
    --card-background: #FFFFFF;
    --border-color: #E5E7EB;
}

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

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

.navbar {
    background-color: var(--card-background);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
}

.nav-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    text-decoration: none;
}

.nav-links a {
    color: var(--text-color);
    text-decoration: none;
    margin-left: 2rem;
    font-weight: 500;
    transition: color 0.2s;
}

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

.nav-links a.active {
    color: var(--primary-color);
}

main {
    margin-top: 4rem;
}

.hero {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-hover));
    color: white;
    padding: 6rem 2rem;
    text-align: center;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.subtitle {
    font-size: 1.25rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

.cta-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
}

.cta-button {
    padding: 0.75rem 1.5rem;
    border-radius: 0.5rem;
    text-decoration: none;
    font-weight: 500;
    transition: transform 0.2s;
}

.cta-button:hover {
    transform: translateY(-2px);
}

.cta-button.primary {
    background-color: white;
    color: var(--primary-color);
}

.cta-button.secondary {
    background-color: transparent;
    color: white;
    border: 2px solid white;
}

.game-modes {
    padding: 4rem 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.game-modes h2 {
    text-align: center;
    margin-bottom: 3rem;
    font-size: 2rem;
}

.mode-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.mode-card {
    background-color: var(--card-background);
    padding: 2rem;
    border-radius: 1rem;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.mode-card h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.mode-card ul {
    list-style-position: inside;
    margin-top: 1rem;
}

.features {
    background-color: var(--card-background);
    padding: 4rem 2rem;
}

.features h2 {
    text-align: center;
    margin-bottom: 3rem;
    font-size: 2rem;
}

.feature-grid {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.feature {
    text-align: center;
    padding: 2rem;
}

.feature h3 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

footer {
    background-color: var(--card-background);
    padding: 2rem;
    border-top: 1px solid var(--border-color);
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    text-align: center;
}

.footer-links {
    margin-bottom: 1rem;
}

.footer-links a {
    color: var(--text-color);
    text-decoration: none;
    margin: 0 1rem;
}

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

.copyright {
    color: var(--secondary-color);
    font-size: 0.875rem;
}

@media (max-width: 768px) {
    .hero h1 {
        font-size: 2rem;
    }
    
    .nav-content {
        padding: 1rem;
    }
    
    .nav-links a {
        margin-left: 1rem;
    }
    
    .cta-buttons {
        flex-direction: column;
    }
    
    .mode-cards {
        grid-template-columns: 1fr;
    }
}