body {
    margin: 0;
    font-family: system-ui, sans-serif;
    background: #f5f5f5;
    color: #333;
}

header {
    background: #1e1e1e;
    color: #fff;
    padding: 60px 20px;
    text-align: center;
}

header h1 {
    margin: 0;
    font-size: 3rem;
    font-weight: 300;
}

header p {
    margin-top: 10px;
    font-size: 1.2rem;
    opacity: 0.8;
}

nav {
    background: #fff;
    padding: 10px 20px;
    display: flex;
    justify-content: center;
    gap: 20px;
    border-bottom: 1px solid #ddd;
}

nav a {
    text-decoration: none;
    color: #333;
    font-weight: 500;
}

.section {
    max-width: 900px;
    margin: 40px auto;
    padding: 0 20px;
}

.section h2 {
    font-size: 2rem;
    margin-bottom: 10px;
    font-weight: 400;
}

.card {
    background: #fff;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 2px 6px rgba(0,0,0,0.1);
    margin-top: 20px;
}

footer {
    text-align: center;
    padding: 20px;
    font-size: 0.9rem;
    color: #666;
}