:root {
    --primary: #2563eb;
    --text: #1f2937;
    --text-muted: #6b7280;
    --bg: #ffffff;
    --bg-secondary: #f9fafb;
    --border: #e5e7eb;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text);
    background: var(--bg);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

header {
    padding: 1rem 2rem;
    border-bottom: 1px solid var(--border);
}

header nav a {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text);
    text-decoration: none;
}

main {
    flex: 1;
    padding: 2rem;
    max-width: 800px;
    margin: 0 auto;
    width: 100%;
}

.hero {
    text-align: center;
    padding: 4rem 0;
}

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

.tagline {
    font-size: 1.5rem;
    color: var(--text-muted);
    margin-bottom: 1rem;
}

.description {
    font-size: 1.125rem;
    max-width: 600px;
    margin: 0 auto;
}

.features {
    padding: 3rem 0;
}

.features h2 {
    margin-bottom: 1.5rem;
}

.features ul {
    list-style: none;
}

.features li {
    padding: 0.75rem 0;
    padding-left: 1.5rem;
    position: relative;
}

.features li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--primary);
}

.content h1 {
    margin-bottom: 2rem;
}

.content h2 {
    margin-top: 2rem;
    margin-bottom: 1rem;
}

.content h3 {
    margin-top: 1.5rem;
    margin-bottom: 0.75rem;
}

.content p {
    margin-bottom: 1rem;
}

.content ul, .content ol {
    margin-bottom: 1rem;
    padding-left: 1.5rem;
}

.content li {
    margin-bottom: 0.5rem;
}

.content a {
    color: var(--primary);
    text-decoration: none;
}

.content a:hover {
    text-decoration: underline;
}

.content strong {
    font-weight: 600;
}

.content em {
    font-style: italic;
}

footer {
    padding: 2rem;
    text-align: center;
    border-top: 1px solid var(--border);
    color: var(--text-muted);
}

footer a {
    color: var(--text-muted);
    text-decoration: none;
}

footer a:hover {
    color: var(--text);
}

footer p {
    margin-top: 0.5rem;
    font-size: 0.875rem;
}

@media (max-width: 640px) {
    .hero h1 {
        font-size: 2rem;
    }

    .tagline {
        font-size: 1.25rem;
    }

    main {
        padding: 1rem;
    }
}