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

html,
body {
    width: 100%;
    height: 100%;
    font-family: Arial, Helvetica, sans-serif;
    background: #f4f6f9;
}

#app {
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    padding: 20px;
}

.card {
    width: 100%;
    max-width: 900px;
    background: #ffffff;
    border-radius: 10px;
    padding: 25px;
    box-shadow: 0 2px 10px rgba(0,0,0,.08);
}

h1 {
    color: #1976d2;
    margin-bottom: 8px;
}

.subtitle {
    color: #666;
    margin-bottom: 25px;
}

button {
    background: #1976d2;
    color: white;
    border: none;
    border-radius: 6px;
    padding: 12px 20px;
    font-size: 15px;
    cursor: pointer;
    margin-bottom: 20px;
}

button:hover {
    background: #1565c0;
}

pre {
    background: #f7f7f7;
    border: 1px solid #ddd;
    border-radius: 6px;
    padding: 15px;
    min-height: 250px;
    white-space: pre-wrap;
    overflow-wrap: break-word;
    font-size: 14px;
}