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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: #333;
    background: #f5f5f5;
}

header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 3rem 1rem;
    text-align: center;
}

header h1 {
    font-size: 3rem;
    margin-bottom: 0.5rem;
}

.tagline {
    font-size: 1.25rem;
    opacity: 0.9;
}

main {
    max-width: 900px;
    margin: 0 auto;
    padding: 2rem 1rem;
}

section {
    background: white;
    padding: 2rem;
    margin-bottom: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

section h2 {
    color: #667eea;
    margin-bottom: 1rem;
    font-size: 1.75rem;
}

.features ul {
    list-style: none;
    padding: 0;
}

.features li {
    padding: 0.75rem 0;
    border-bottom: 1px solid #eee;
}

.features li:last-child {
    border-bottom: none;
}

.version-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-top: 1.5rem;
}

.version-card {
    border: 2px solid #e0e0e0;
    padding: 1.5rem;
    border-radius: 8px;
    text-align: center;
}

.version-card h3 {
    margin-bottom: 0.5rem;
    color: #333;
}

.version-label {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.875rem;
    font-weight: bold;
    margin-bottom: 1rem;
}

.version-label.stable {
    background: #10b981;
    color: white;
}

.version-label.beta {
    background: #f59e0b;
    color: white;
}

.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    margin-top: 1rem;
    text-decoration: none;
    border-radius: 6px;
    font-weight: 600;
    transition: all 0.3s;
}

.btn-primary {
    background: #667eea;
    color: white;
}

.btn-primary:hover {
    background: #5568d3;
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(102, 126, 234, 0.3);
}

.btn-secondary {
    background: #f59e0b;
    color: white;
}

.btn-secondary:hover {
    background: #d97706;
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(245, 158, 11, 0.3);
}

.about a {
    color: #667eea;
    text-decoration: none;
    font-weight: 600;
}

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

footer {
    text-align: center;
    padding: 2rem 1rem;
    color: #666;
    background: white;
    margin-top: 2rem;
}

@media (max-width: 768px) {
    header h1 {
        font-size: 2rem;
    }

    .tagline {
        font-size: 1rem;
    }

    section {
        padding: 1.5rem;
    }
}