body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f4f4f9;
    color: #333;
    line-height: 1.6;
}

header {
    background-color: #2c3e50;
    color: #ffffff;
    padding: 1.5rem 1rem;
    text-align: center;
    box-shadow: 0 2px 5px rgba(0,0,0,0.2);
}

header h1 {
    margin: 0;
    font-size: 1.8rem;
}

main {
    padding: 1rem;
    max-width: 800px;
    margin: 1rem auto;
}

.card {
    background-color: #ffffff;
    border-radius: 8px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
    padding: 1.5rem;
    margin-bottom: 1rem;
}

.card h2 {
    color: #2c3e50;
    margin-top: 0;
}

input[type="text"] {
    width: calc(100% - 110px);
    padding: 8px;
    border: 1px solid #ddd;
    border-radius: 4px;
    margin-right: 10px;
}

button {
    padding: 8px 12px;
    background-color: #2c3e50;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}

button:hover {
    background-color: #34495e;
}

li {
    padding: 5px 0;
}