* {
    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: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.container {
    background: white;
    border-radius: 10px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
    max-width: 800px;
    width: 100%;
    padding: 40px;
}

header {
    text-align: center;
    margin-bottom: 40px;
    padding-bottom: 20px;
    border-bottom: 2px solid #667eea;
}

h1 {
    font-size: 2.5rem;
    color: #667eea;
    margin-bottom: 10px;
}

.tagline {
    font-size: 1.2rem;
    color: #666;
}

main {
    margin-bottom: 40px;
}

section {
    margin-bottom: 30px;
}

h2 {
    font-size: 1.8rem;
    color: #764ba2;
    margin-bottom: 15px;
}

p {
    margin-bottom: 15px;
}

ul {
    list-style: none;
    padding-left: 0;
}

li {
    padding: 10px 0;
    padding-left: 30px;
    position: relative;
}

li:before {
    content: "✓";
    position: absolute;
    left: 0;
    color: #667eea;
    font-weight: bold;
}

footer {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid #eee;
    color: #999;
}

a {
    color: #667eea;
    text-decoration: none;
    transition: color 0.3s;
}

a:hover {
    color: #764ba2;
}

.error {
    text-align: center;
    padding: 40px 0;
}

.error p {
    font-size: 1.2rem;
    margin-bottom: 20px;
}

@media (max-width: 600px) {
    .container {
        padding: 20px;
    }
    
    h1 {
        font-size: 2rem;
    }
    
    h2 {
        font-size: 1.5rem;
    }
}