:root {
    --bg-color: #0a0a0a;
    --text-color: #e0e0e0;
    --accent-color: #6366f1;
    --card-bg: #141414;
    --card-border: #222;
    --header-font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --body-font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: var(--body-font);
    line-height: 1.6;
    padding: 2rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    min-height: 100vh;
}

header {
    margin-bottom: 4rem;
    text-align: center;
}

header h1 {
    font-size: 2.5rem;
    font-weight: 300;
    letter-spacing: 0.1rem;
    color: var(--text-color);
}

.container {
    max-width: 900px;
    width: 100%;
}

.section {
    margin-bottom: 3rem;
}

.section h2 {
    font-size: 1.2rem;
    font-weight: 400;
    margin-bottom: 1.5rem;
    color: #888;
    text-transform: uppercase;
    letter-spacing: 0.2rem;
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
}

.card {
    background-color: var(--card-bg);
    border: 1px solid var(--card-border);
    padding: 1.5rem;
    border-radius: 8px;
    text-decoration: none;
    color: var(--text-color);
    transition: all 0.3s ease;
    display: block;
}

.card:hover {
    border-color: var(--accent-color);
    transform: translateY(-4px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
}

.card h3 {
    font-size: 1.1rem;
    font-weight: 500;
    margin-bottom: 0.5rem;
}

.card p {
    font-size: 0.9rem;
    color: #999;
}

/* Back Link for subpages */
.back-link {
    display: inline-block;
    margin-bottom: 2rem;
    color: #888;
    text-decoration: none;
    font-size: 0.9rem;
    transition: color 0.2s ease;
}

.back-link:hover {
    color: var(--accent-color);
}

@media (max-width: 600px) {
    body {
        padding: 1rem;
    }
    header {
        margin-bottom: 2rem;
    }
    header h1 {
        font-size: 2rem;
    }
}