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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    line-height: 1.6;
    color: #333;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
}

#app {
    max-width: 800px;
    margin: 0 auto;
    padding: 2rem;
}

header {
    background: white;
    padding: 1.5rem;
    border-radius: 8px;
    margin-bottom: 2rem;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

header h1 {
    color: #667eea;
    margin-bottom: 1rem;
}

nav {
    display: flex;
    gap: 1rem;
}

nav a {
    color: #764ba2;
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    transition: background 0.3s;
}

nav a:hover {
    background: #f0f0f0;
}

nav a.active {
    background: #667eea;
    color: white;
}

main {
    background: white;
    padding: 2rem;
    border-radius: 8px;
    min-height: 300px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

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