:root {
    --primary-color: #2563eb;
    --text-color: #1f2937;
    --text-muted: #6b7280;
    --bg-color: #f9fafb;
    --card-bg: #ffffff;
    --max-width: 800px;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --font-serif: 'Merriweather', Georgia, serif;
}

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

body {
    font-family: var(--font-sans);
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-color);
    padding: 40px 20px;
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    background: var(--card-bg);
    padding: 60px;
    border-radius: 12px;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
}

header {
    margin-bottom: 40px;
    border-bottom: 2px solid #f3f4f6;
    padding-bottom: 20px;
}

h1 {
    font-size: 2.5rem;
    font-weight: 800;
    color: #111827;
    letter-spacing: -0.025em;
    margin-bottom: 10px;
}

h2 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-top: 40px;
    margin-bottom: 16px;
    color: #111827;
}

p {
    margin-bottom: 20px;
}

ul {
    margin-bottom: 20px;
    padding-left: 20px;
}

li {
    margin-bottom: 10px;
}

.last-updated {
    font-size: 0.875rem;
    color: var(--text-muted);
}

.nav-links {
    margin-top: 30px;
    display: flex;
    gap: 20px;
}

.nav-links a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
}

.nav-links a:hover {
    text-decoration: underline;
}

.highlight {
    background-color: #fef3c7;
    padding: 2px 4px;
    border-radius: 4px;
    font-weight: 600;
}

@media (max-width: 640px) {
    .container {
        padding: 30px 20px;
    }
    
    h1 {
        font-size: 2rem;
    }
}