/* Basic reset and typography */
body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen,
        Ubuntu, Cantarell, "Open Sans", "Helvetica Neue", sans-serif;
    background-color: #f9f9f9;
    color: #333;
    line-height: 1.6;
    padding: 1rem;
}

.container {
    max-width: 600px;
    margin: 0 auto;
    background: white;
    padding: 2rem;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    border-radius: 8px;
}

h1 {
    font-weight: 600;
    font-size: 1.8rem;
    margin-bottom: 1rem;
    text-align: center;
    color: #2c3e50;
}

.letter p {
    margin-bottom: 1rem;
    font-size: 1.1rem;
}

select {
    font-size: 1rem;
    padding: 0.25rem 0.5rem;
    margin-left: 0.25rem;
    border: 1px solid #ccc;
    border-radius: 4px;
    background-color: white;
    color: #333;
    cursor: pointer;
}

select:focus {
    outline: none;
    border-color: #2980b9;
    box-shadow: 0 0 3px #2980b9;
}

/* Responsive adjustments */
@media (max-width: 480px) {
    .container {
        padding: 1rem;
    }

    h1 {
        font-size: 1.5rem;
    }

    .letter p {
        font-size: 1rem;
    }
}

.copy-btn {
    display: block;
    margin: 1.5rem auto 0 auto;
    padding: 0.6rem 1.5rem;
    background-color: #2980b9;
    color: white;
    border: none;
    border-radius: 5px;
    font-size: 1.1rem;
    cursor: pointer;
    transition: background 0.2s;
}
.copy-btn:hover, .copy-btn:focus {
    background-color: #21618c;
}